JP5023422B2 - Method for manufacturing reflective color liquid crystal display device and apparatus for manufacturing the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a reflective color liquid crystal display device, a manufacturing method thereof, and a manufacturing device thereof, and more particularly to a manufacturing method and a manufacturing device of a reflective color liquid crystal display device that displays characters, figures, etc. in color using a white hologram. It is.
[0002]
[Prior art]
Conventionally, as a reflective color liquid crystal display method, a single-polarizing plate method, a guest-host liquid crystal method, and the like are known. Recently, a method using an HPDLC (Holographic Polymer Dispersed Liquid Crystal) element has attracted attention. In this method, since a polarizing plate and a color filter are not used, it is possible to realize bright reflection display. For example, Japanese Patent Laid-Open No. 6-294952 discloses an HPDLC element in which liquid crystal droplets and a transparent solid are present in a liquid crystal layer in a periodic structure. In the HPDLC element, when external light is incident in a state where no voltage is applied, Bragg reflection occurs due to a periodic structure of liquid crystal droplets and a transparent solid, and reflects light in a wavelength region corresponding to the periodic interval of the periodic structure. Light of other wavelengths is transmitted. In a state where a voltage is applied, the refractive index of the liquid crystal droplet in the HPDLC element changes. As the refractive index difference between the liquid crystal droplet and the transparent solid decreases, the intensity of Bragg reflection decreases, and the refractive index difference disappears. All incident light passes through the liquid crystal layer. Bright and dark display is performed using such a reflection state and a transmission (transparent) state. The HPDLC element is manufactured by performing two-beam interference exposure on a cell in which a precursor of a transparent solid material, a liquid crystal material, a polymerization initiator, and the like are enclosed. In the two-beam interference exposure, the transparent solid material precursor is cured at a portion where the light intensity of the interference light fringes generated by the interference of two light beams is strong, and a portion where the ratio of the transparent solid material is high is generated. On the contrary, in the portion where the light intensity of the interference light fringe is weak, a portion where the ratio of the liquid crystal material is high occurs. As a result, in the cell, a periodic structure is formed in which a portion where the ratio of the transparent solid is high and a portion where the ratio of the liquid crystal material is high are periodically generated. As described above, this periodic structure reflects light having a wavelength that satisfies the Bragg condition during display.
[0003]
JP-A-6-294952 discloses that HPDLC elements having different reflection wavelengths are formed between different transparent substrate pairs and are laminated on a light absorption film in order to use the HPDLC element as a color display device. A method of arranging and a method of arranging HPDLC elements having different reflection wavelengths on a plane are described.
A method of laminating and arranging a plurality of HPDLC elements formed between different transparent substrates is also described in Japanese Patent Application Laid-Open Nos. 10-31217 and 2000-89028. Japanese Patent Application Laid-Open No. 9-265088 discloses a liquid crystal mixed interference film in which liquid crystals and polymer layers are alternately arranged to reflect light of different wavelengths on a substrate, and an electrode layer and an insulating layer between them. A reflective color liquid crystal display device has been proposed in which a thin film transistor formed on a substrate and an electrode layer formed on each layer are connected through a through hole.
[0004]
[Problems to be solved by the invention]
In the method of laminating a plurality of HPDLC elements having different reflection wavelengths or laminating a plurality of liquid crystal mixed interference films having different reflection wavelengths described in the above-mentioned publications through electrodes, There is a problem that a three-dimensional wiring for independent driving is required, and the element structure and the manufacturing process become complicated. Further, in the method of laminating a plurality of HPDLC elements, for example, three HPDLC elements each having a liquid crystal resin composite sandwiched between glass substrates must be laminated, resulting in a problem that the display device becomes thick. Furthermore, in the method of planarly arranging a plurality of HPDLC elements having different reflection wavelengths described in Japanese Patent Laid-Open No. 6-294952, three types of HPDLC elements having different reflection wavelengths must be produced in the same plane. Therefore, it is necessary to repeat the interference exposure through the mask three times, which complicates the manufacturing process.
[0005]
The present invention has been made in view of these prior arts, and its object is to provide a simple structure that does not require a laminated arrangement or a planar arrangement of HPDLC elements and liquid crystal mixed interference films having different reflection wavelengths. -Bright reflective color liquid crystal display with configuration The A manufacturing method that can be manufactured with fewer steps and It is to provide the manufacturing apparatus.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, according to the present invention, a liquid mixture containing at least a transparent solid material precursor and a liquid crystal material is injected into a cell in which a pair of transparent substrates provided with transparent electrodes are bonded together via a spacer. And a two-beam interference for forming a photocuring layer of the transparent solid material precursor having periodicity by irradiating the cell into which the mixed solution has been injected with two lights having the same wavelength from different directions. Exposure The periodicity of the photocured layer formed is different 2 or 3 types about There is provided a method for manufacturing a reflective color liquid crystal display device, characterized in that the method includes a step of performing time division.
[0007]
In order to achieve the above object, according to the present invention, the mixed liquid in a cell into which a mixed liquid containing a photosensitive transparent solid material precursor and a liquid crystal material is injected is obtained. Two-beam interference exposure To form a plurality of periodic structures with different stacking period intervals in the cell And at least one laser light source, at least one optical path switching means for switching a traveling direction of light emitted from the laser light source, and light emitted from the optical path switching means is divided into two. A plurality of beam splitters, a plurality of mirror pairs that reflect the light emitted from each of the beam splitters toward two surfaces of the cell, and a beam splitter into which light is incident simultaneously among the plurality of beam splitters. There is provided an apparatus for manufacturing a reflective color liquid crystal display device, comprising: an optical path control signal generator for controlling the optical path switching means so that there is only one.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Before specifically describing the embodiments of the present invention, the present invention Manufactured by using the manufacturing method and manufacturing apparatus The basic structure of the reflective color liquid crystal display device will be described.
FIG. 1 shows the present invention. Manufactured using manufacturing method and manufacturing equipment It is sectional drawing which shows the basic structure of a reflection type color liquid crystal display device.
As shown in FIG. Manufactured using manufacturing method and manufacturing equipment The reflective color liquid crystal display device includes two substrates 3 and 4 on which at least one substrate 3 is transparent, and electrodes 5 and 6 on which at least one electrode 5 formed on the surface of each of the substrates 3 and 4 is transparent. And the light control layer 1 sandwiched between the electrodes 5 and 6 and the substrates 3 and 4 and the color filters 2A, 2B and 2C formed on the substrate 3 and transmitting red, green and blue light, respectively. And a light absorption layer 7 formed on the substrate 4. In FIG. 1, the color filter 2 is formed on the surface of the substrate 3 opposite to the light control layer 1, but between the substrate 3 and the electrode 5, or between the electrode 5 and the light control layer 1. It may be formed. The light absorption layer 7 is formed on the surface of the substrate 4 opposite to the light control layer 1, but may be formed between the substrate 4 and the electrode 6. In this case, the substrate 4 does not need to be transparent. The light absorption layer 7 may be formed between the electrode 6 and the light control layer 1. In this case, the electrode 6 need not be transparent. Further, the substrate 4 may have a light absorption function. In this case, the light absorption layer 7 can be deleted. The light control layer 1 is a layer that reflects white, and the amount of reflection is controlled by a voltage applied between the electrodes 5 and 6.
[0009]
In this invention Manufactured by using the manufacturing method and manufacturing apparatus When external light, which is white light, is incident on the reflective color liquid crystal display device from the color filter 2 side, the incident external light passes through the color filters 2A, 2B, and 2C, and then is red, green, and blue light, respectively. And enters the light control layer 1. Since the light control layer 1 reflects white, that is, can reflect all light, only the single light control layer 1 reflects each light of red, green, and blue. The red, green, and blue light reflected by the light control layer 1 passes through the color filters 2A, 2B, and 2C again and is emitted to the outside. At this time, when a voltage is applied to the dimming layer 1 via the electrodes 5 and 6, the amount of reflection of the dimming layer 1 with respect to the incident light amount continuously changes depending on the applied voltage, and a reflective display including a halftone is generated. It becomes possible. The light transmitted without being reflected by the light control layer 1 is absorbed by the light absorption layer 7.
Next, the present invention Reference examples and Embodiments will be described in detail with reference to the drawings.
[0010]
[First Reference example ]
FIG. 2 shows the first aspect of the present invention. Reference example It is sectional drawing of this reflective type color liquid crystal display device.
As shown in FIG. Reference example The reflective type color liquid crystal display device includes two transparent substrates 13 and 14, transparent electrodes 15 and 16 formed on the surfaces of the transparent substrates 13 and 14, between the transparent electrodes 15 and 16, and the transparent substrate 13, respectively. A light control layer 11 sandwiched between the color filter 12 and the color filter 12 formed on the transparent substrate 13 and made of color filters 12A, 12B, and 12C that transmit red, green, and blue light, respectively. And a light absorption layer 17 formed on the substrate 14.
FIG. 2 shows one pixel each having one color filter 12A, 12B, and 12C that transmits red, green, and blue light. An actual reflective color liquid crystal display device is shown in FIG. The structure shown in FIG. 2 is taken as one unit, and the unit is formed in a two-dimensional array continuously connected to the rows and columns.
[0011]
The light control layer 11 includes a layer having a relatively high refractive index (hereinafter referred to as a “high refractive index layer”) and a layer having a relatively low refractive index when no voltage is applied or when a voltage is applied. Hereinafter, it has a periodic structure in which “low refractive index layers” are alternately stacked. The periodic structure is formed of three types of periodic structures 18, 19, and 20 having different periodic intervals. The periodic structures 18, 19 and 20 include a high refractive index layer 18A and a low refractive index layer 18B, a high refractive index layer 19A and a low refractive index layer 19B, a high refractive index layer 20A and a low refractive index layer 20B, respectively. Are alternately stacked.
The book shown in FIG. Reference example In the reflection type color liquid crystal display device, only a few high refractive index layers and a low refractive index layer are shown in the periodic structures 18, 19 and 20 for simplicity of drawing. Consists of several tens of layers to several hundreds of high refractive index layers and the same number of low refractive index layers.
[0012]
this book Reference example When external light is incident on the reflective color liquid crystal display device from the color filter 12 side, the light that has been transmitted through the color filters 12A, 12B, and 12C to become red, green, and blue, respectively, in the light control layer 11 After being reflected by each of the periodic structures, the light passes through the color filters 12A, 12B, and 12C again and is emitted to the outside. At this time, when a voltage is applied to the light control layer 11, the refractive index of the high refractive index layer and / or the low refractive index layer forming the periodic structure is continuously changed by the applied voltage. Therefore, the amount of reflection of the light control layer 11 with respect to the amount of incident light continuously changes, and reflection display including a halftone becomes possible. The light transmitted without being reflected by the light control layer 11 is absorbed by the light absorption layer 17.
[0013]
Book Reference example The reflective color liquid crystal display device also includes a periodic structure 18 composed of a high refractive index layer 18A and a low refractive index layer 18B in a light control layer, a periodic structure 19 composed of a high refractive index layer 19A and a low refractive index layer 19B, and Although the interface of each layer of the periodic structure 20 including the high refractive index layer 20A and the low refractive index layer 20B may be parallel to the substrate surface, it is more desirable that the interface is inclined as shown in FIG. The layer interval of each periodic structure in the periodic structures 18, 19, and 20 and the inclination angle formed by the layer interface of these layers with respect to the substrate surface are determined from the upper left to the lower right of the page. When white light is incident obliquely, red light, green light, and blue light are respectively reflected in the normal direction of the substrate according to Bragg reflection conditions. At this time, the light control layer 11 can reflect white light in the normal direction of the substrate by additive color mixing.
[0014]
As shown in FIG. 2, when the layer interface of each layer of the periodic structure is inclined with respect to the substrate surface, Reference example When the external color light is reflected by the reflective color liquid crystal display device, the external light is not specularly reflected on the surface of the substrate 13 but is specularly reflected on the interface of each layer of the periodic structure. That is, the external light is incident on the substrate 13 from the upper left to the lower right in FIG. 2, and the red light transmitted through the color filter 12A that transmits the red light is the high refractive index layer in the light control layer 11. A color filter 12A that is reflected in the normal direction of the surface of the substrate 13 by the periodic structure of 18A and the low refractive index layer 18B, and transmits the red light of the same pixel as the pixel on which the red light is incident as external light. Transmitted and emitted. The same applies to green light and blue light transmitted through the color filters 12B and 12C, respectively. So book Reference example In the reflective type color liquid crystal display device, it can be viewed from the normal direction of the substrate, and nevertheless, external light is reflected by the surface reflection of the color filter 12 or the transparent substrate 13 and becomes dazzling. There is no. When the layer interface of each layer formed by the periodic structure of the high refractive index layer and the low refractive index layer in the light control layer is parallel to the substrate surface, the normal line of the transparent substrate 13 that is illumination light Although the display is darkened because the person's head blocks the external light from the direction, Reference example This is not the case with the reflective color liquid crystal display device.
[0015]
In the above description, the light control layer 11 is formed of three types of periodic structures 18, 19, and 20 that reflect red, green, and blue light, but there are three types of periodic structures that form the light control layer 11. It is not limited to. For full-color display, as long as the light control layer reflects white light, there may be three or more types of periodic structures. For example, any or all of the periodic structures that reflect red, green, and blue light may be formed of a plurality of periodic structures in which the layer spacing between the high refractive index layer and the low refractive index layer is slightly different. . Such a periodic structure can broaden the spectrum width of the reflected light and increase the brightness. In addition, when performing multi-color display instead of full-color display, the periodic structure for forming the light control layer may be at least two types. FIG. 3 shows a light control layer 21 having two types of periodic structures 28 and 29. The periodic structures 28 and 29 are formed of high refractive index layers 28A and 29A and low refractive index layers 28B and 29B, respectively. The layer interval of the periodic structure 28 and the layer interval of the periodic structure 29 are different from each other. If the two lights reflected by the periodic structures 28 and 29 are complementary to each other, the light control layer 21 reflects white light. In FIG. 3, a transparent substrate other than the light control layer is omitted.
[0016]
As explained above, the book Reference example The reflective color liquid crystal display device has a light control layer composed of three periodic structures composed of a high-refractive index layer and a low-refractive index layer that reflects red, green, and blue, so that HPDLC elements having different reflection wavelengths Can be displayed brightly and with excellent visibility, while having a simple structure and configuration without stacking or flatly arranging.
Actually Reference example In the reflection type color liquid crystal display device, a single periodic structure that reflects only red light, green light, and blue light is formed on the light control layer immediately below the color filters 12A, 12B, and 12C, respectively. Can also be displayed in full color. However, as shown in FIG. 2, a periodic structure that reflects red light, green light, and blue light is formed immediately below any of the color filters 12A, 12B, and 12C, and the entire light control layer 11 is white. By using a reflective layer that reflects light, there is an advantage that it is not necessary to align the color filter 12 and the periodic structure in the light control layer 11.
[0017]
[Second Reference example ]
FIG. 4 shows a second embodiment of the present invention. Reference example It is sectional drawing of this reflective type color liquid crystal display device.
As shown in FIG. Reference example The reflective type color liquid crystal display device includes two transparent substrates 33 and 34, transparent electrodes 35 and 36 formed on the surfaces of the transparent substrates 33 and 34, and between the transparent electrodes 35 and 36 and the transparent substrate 33, respectively. A light control layer 31 sandwiched between and 34, a color filter 32 formed on the substrate 33 and made up of color filters 32A, 32B, and 32C that respectively transmit red, green, and blue light, and a substrate A light absorption layer 37 formed on the upper surface 34. FIG. 4 shows one pixel having one color filter 32A, 32B, and 32C that transmits red, green, and blue light, as in FIG.
The light control layer 31 includes the first Reference example In the same manner as described above, it has a periodic structure in which high refractive index layers and low refractive index layers are alternately laminated. In addition, the periodic structure is formed from three types of periodic structures with different layer intervals constituting the periodic structure, and when white light is incident on these periodic structures from the upper left to the lower right of the page, In the normal direction of the substrate, red light, green light, and blue light are set to be reflected according to Bragg reflection conditions. Book Reference example The light control layer 31 in the reflective color liquid crystal display device of FIG. Reference example The reflective color liquid crystal display device is different from the light control layer 11 in that a periodic structure that reflects red light, green light, and blue light in the light control layer is formed uniformly in each pixel. It is a point. That is, the periodic structures that reflect red light, green light, and blue light have a complicated structure. At this time, the light control layer 31 can reflect white light by additive color mixing.
[0018]
this book Reference example When external light is incident on the reflective color liquid crystal display device according to the color filter 32 side, the light that has been transmitted through the color filters 32A, 32B, and 32C to become red, green, and blue, respectively, is the light control layer 31. Then, the light passes through the color filters 32A, 32B, and 32C again and is emitted to the outside. At this time, when a voltage is applied to the light control layer 31, the refractive index of the high refractive index layer and / or the low refractive index layer forming the periodic structure is continuously changed by the applied voltage. Therefore, the amount of reflection of the light control layer 31 with respect to the amount of incident light continuously changes, and a reflective display including a halftone becomes possible. The light transmitted without being reflected by the light control layer 31 is absorbed by the light absorption layer 37.
[0019]
Book Reference example In the reflective color liquid crystal display device, the layer interfaces of the high refractive index layers 38A, 39A, 40A and the low refractive index layer 31B in the light control layer may be parallel to the substrate surface. It is more desirable to be inclined as shown in FIG. When the layer interface of each of the high refractive index layer and the low refractive index layer in the light control layer is inclined with respect to the substrate surface, the first Reference example For the same reason, even if external light is incident from a direction different from the normal direction of the substrate, it can be viewed from the normal direction of the substrate, and illumination light can also be viewed from the normal direction of the substrate. Good visibility can be obtained without the occurrence of external light reflection and the problem of shielding the illumination light by the human head.
Book Reference example The reflective color liquid crystal display device of the first Reference example Similar to the reflective color liquid crystal display device, HPDLC elements with different reflection wavelengths can be stacked and arranged in a simple manner, and can be displayed brightly and with excellent visibility. Become. Further, there is an advantage that the alignment between the color filter 32 and the periodic structure in the light control layer 31 is not necessary.
[0020]
[Third Reference example ]
FIG. 5 illustrates the third aspect of the present invention. Reference example It is sectional drawing of this reflective type color liquid crystal display device. 6 is a cross-sectional view of a part of the light control layer of the reflective color liquid crystal display device of FIG. FIG. 7 is a diagram of incident light / reflected light to the light control layer of FIG.
As shown in FIG. Reference example The reflective type color liquid crystal display device includes two transparent substrates 43 and 44, transparent electrodes 45 and 46 formed on the surfaces of the transparent substrates 43 and 44, the transparent electrodes 45 and 46, and the transparent substrate 43, respectively. Dimming layer 41 sandwiched between and 44, color filter 42 formed on substrate 43 and made up of color filters 42A, 42B and 42C for transmitting red, green and blue light, respectively, and substrate And a light absorption layer 47 formed on 44. FIG. 5 shows one pixel having one color filter 42A, 42B, and 42C that transmits red, green, and blue light.
The light control layer 41 has a periodic structure in which high refractive index layers and low refractive index layers are alternately stacked. The periodic structure is formed of three types of periodic structures 48, 49, and 50 having different layer intervals of the layers constituting the periodic structure. The periodic structures 48, 49, and 50 have a high refractive index layer 48A and a low refractive index layer 48B, a high refractive index layer 49A and a low refractive index layer 49B, and a high refractive index layer 50A and a low refractive index layer 50B, respectively. It is formed by laminating.
[0021]
As shown in FIG. 6, the layer interface of each of the high refractive index layer and the low refractive index layer is not flat, is finely curved at a minute portion of the interface, and the minutely curved minute portion is They are continuously arranged in the plane of the interface. As shown in FIG. 6 (a), this finely curved layer interface is an array of interfaces extending in one direction in a bowl shape from the lower right to the upper left of the paper and arranged in an array from the lower left to the upper right of the paper. Alternatively, as shown in FIG. 6B, microlens-like microinterfaces may be two-dimensionally arranged like roof tiles.
[0022]
FIG. 7 illustrates a state in which external light is reflected when external light is incident on an arbitrary one-layer interface 101. Let θ be the angle formed by the normal 104 to the tangent plane 103 of the interface 101 and the normal to the substrate surface at the vertex 102 of one minute portion 108 of the layer interface 101. White light incident at an angle θ with the normal 104 is reflected in the normal direction of the substrate surface. The wavelength of the reflected light is determined by the layer interval of the periodic structure formed by the layer interface 101 and the incident angle θ of white light. An angle γ formed between the tangent plane 103 and the tangent plane 106 of the interface 101 at an arbitrary point 105 on the layer interface 101 is defined as a bending angle. Assuming that the normal to the tangential plane 106 is 107, the angle between the incident white light and the normal 107 is θ + γ. That is, the reflected light is diffused to an angle range that is twice the maximum bending angle of the curved layer interface. Therefore, the viewing angle can be adjusted by adjusting the (maximum) bending angle γ.
[0023]
With the above, book Reference example The reflective color liquid crystal display device of the first Reference example In addition to the same effect as that of the reflective color liquid crystal display device, Reference example This makes it possible to perform display with a wide viewing angle and uniform luminance that cannot be obtained with the reflective color liquid crystal display device.
The above-described reflective color liquid crystal display device has the first Reference example In the reflective color liquid crystal display device, a fine curve is formed at the layer interface of each layer forming the periodic structure. Reference example It goes without saying that the same effect can be obtained even if a fine curve is formed at the layer interface of each layer forming the periodic structure of the reflective color liquid crystal display device.
Book Reference example In the reflective color liquid crystal display device, the average layer interface of each layer forming the periodic structure is inclined with respect to the substrate. Reference example For the same reason.
The book shown in FIG. Reference example In the reflection type color liquid crystal display device, only a few high refractive index layers and low refractive index layers are shown in the periodic structures 48, 49 and 50 for the sake of simple drawing. Consists of several tens of layers to several hundreds of high refractive index layers and the same number of low refractive index layers.
[0024]
[Fourth Reference example ]
FIG. 8 shows the fourth aspect of the present invention. Reference example It is sectional drawing of this reflective type color liquid crystal display device. Book Reference example In the reflection type color liquid crystal display device, the first shown in FIG. Reference example A lenticular lens array 140 in which fine semi-cylindrical lenses are arranged in a row is arranged on the color filter of the reflective color liquid crystal display device. In FIG. 8, the same or equivalent components as those in FIG. In such a structure, after the incident white light is transmitted through the color filters 112A, 112B, and 112C, the light that becomes red, green, and blue, respectively, is reflected by the light control layer 111, and again the color filters 112A, 112B, The light passes through 112C and is emitted to the outside. At this time, the light is diffused by the lenticular lens array 140. Therefore, the reflective color liquid crystal display device has the first feature. Reference example In addition to the effects of the reflective color liquid crystal display device, Reference example As in the case of the reflective type color liquid crystal display device, it has the effect of enabling display with a wide viewing angle. The above lenticular lens array may be a microlens array in which fine convex lenses are two-dimensionally formed.
[0025]
[No. 1 Embodiment of
FIG. 9 shows the first aspect of the present invention. 1 It is an arrangement plan of the optical system used for the manufacturing method of the embodiment. FIG. 10 is a cross-sectional view for explaining the two-beam exposure of the present embodiment. In the manufacturing method of the present embodiment, a layer having a high ratio of transparent solid material (hereinafter referred to as “transparent solid material layer”) from a mixture of a photosensitive transparent solid material precursor and a liquid crystal material; A flat periodic structure including a layer having a high ratio of liquid crystal material (hereinafter referred to as “liquid crystal material layer”) is formed.
As shown in FIG. 9, three types of two-beam interference exposure are time-divided in an HPDLC precursor cell 134 in which a mixture of a photosensitive transparent solid material precursor, a liquid crystal material and a polymerization initiator is sandwiched between a pair of substrates. In this way, the reflective color liquid crystal display device of the present invention is manufactured. Examples of the photosensitive transparent solid material precursor include acrylate compounds such as monofunctional or bifunctional acrylates, mixtures of these compounds, and mixtures of these compounds and acrylate oligomers, but are not limited thereto. It is not a thing. Moreover, as a polymerization initiator, normal photopolymerization initiators, such as an acetophenone series and a benzophenone series, can be used, and photopolymerization initiation assistants, such as methyldiethanolamine, can also be added. Furthermore, a dye sensitizer can be added to the polymerization initiator.
[0026]
A coherent light source such as a normal laser is used as a light source for two-beam interference exposure in the manufacturing method of the present embodiment. The selective reflection wavelength of the periodic structure formed of the transparent solid material layer and the liquid crystal material layer to be formed can be adjusted by controlling the wavelength of the light source for two-beam interference exposure and the crossing angle of the two lights. .
As shown in FIG. 9, in the two-beam interference exposure used in the manufacturing method of the present embodiment, three types of two-beam interference exposure can be performed in a time division manner. First, on the optical paths of two laser light sources 121 and 122 having different wavelengths, EO (electro-optic) modulators 123A and 123A that rotate the polarization plane of the laser light, and a polarizing prism that switches the path according to the polarization state of the laser light. Optical path selectors 123 and 124 composed of 123B and 124B are installed. The optical path selectors 123 and 124 switch the optical path of the incident light in conjunction with each other so that one of the two lights from the laser light sources 121 and 122 is used for interference exposure. That is, the light from one of the laser light sources 121 and 122 passes through the corresponding optical path selector 123 (124) and is used for interference exposure. The light from the other laser light source 122 (121) has its polarization plane rotated by the EO modulator 124A (123A), and is absorbed by the corresponding light absorbing plate 127 (126) via the polarizing prism 124B (123B). Further, an optical path selector 125 including an EO modulator 125A and a polarizing prism 125B is installed on the optical path of the laser light source 121. The optical path selector 125 switches the laser light transmitted through the optical path selector 123 of the laser light source 121 to one of the two optical paths 130 and 131 by controlling the polarization plane direction of the laser light by the EO modulator 125A. The operations of these EO modulators 123A, 124A, and 125A are synchronized by an optical path control signal generator 128. That is, according to the signal from the optical path control signal generator 128, one of the two laser beams from the laser light sources 121 and 122 by the optical path selectors 123 and 124 and the selection from the laser light source 121 by the optical path selector 125 are displayed. The optical path switching of the light is controlled, whereby the three laser optical paths 129, 130, 131 are switched in a time division manner. These laser light paths 129, 130, and 131 are further branched into two by beam splitters 132A, 132B, and 132C, respectively. The two light beams branched by the beam splitters 132A, 132B, and 132C are reflected by the mirror pairs 133A, 133B, and 133C, thereby forming an interference exposure optical system that uses three two light beams.
[0027]
The two laser beams reflected by the mirror pairs 133A, 133B, and 133C are incident on the front and rear surfaces of the HPDLC precursor cell 134, cause interference inside the HPDLC precursor cell 134, the wavelength of the laser beam, and the two Interference light fringes having light intensity corresponding to the crossing angle of the laser light are formed. In the HPDLC precursor irradiated with the interference light fringes, the transparent solid material precursor is cured in a region having a high light intensity to form a transparent solid material layer. The liquid crystal material remains in the region where the light intensity is weak, forming a liquid crystal material layer. As a result, three periodic structures with different periodic layer intervals are formed in the cell, in which a transparent solid material layer and a liquid crystal material layer are periodically generated.
[0028]
The liquid crystal has an ordinary ray refractive index n _o And extraordinary ray refractive index n _e The refractive index varies depending on the orientation of liquid crystal molecules. In nematic liquid crystals and smectic liquid crystals, usually n _o <N _e It is. In the state where no voltage is applied, when the liquid crystal is not subjected to special alignment treatment, the liquid crystal has an ordinary refractive index n. _o And extraordinary ray refractive index n _e And an intermediate refractive index. Therefore, as a transparent solid material, for example, ordinary ray refractive index n of a liquid crystal material _o When a material having a refractive index close to is used, the transparent solid material layer becomes a low refractive index layer and the liquid crystal material layer becomes a high refractive index layer.
In such a periodic structure, there is a difference in refractive index between the transparent solid material layer and the liquid crystal material layer when no voltage is applied, so that the periodic structure comprising the transparent solid material layer and the liquid crystal material layer is present. The light having a specific wavelength corresponding to the layer interval is reflected. When a sufficient voltage is applied to this periodic structure, the refractive index of the liquid crystal is the ordinary ray refractive index n. _o It becomes. Therefore, there is almost no refractive index difference between the transparent solid material layer and the liquid crystal material layer, and light is transmitted without being reflected.
As a transparent solid material, ordinary ray refractive index n _o And extraordinary ray refractive index n _e When a material having an intermediate refractive index is used, incident light is transmitted without being reflected when no voltage is applied, and when a voltage is applied, a transparent solid material layer and a liquid crystal material layer are formed. Light having a specific wavelength corresponding to the layer interval of the periodic structure is reflected. In this case, the transparent solid material layer is a high refractive index layer, and the liquid crystal material layer is a low refractive index layer.
[0029]
The three laser light paths 129, 130, and 131 are switched at arbitrary time intervals by a signal from the light path control signal generator 128. Therefore, the exposure times of the three two-beam interference exposures can be arbitrarily changed in a time division manner. For example, during time T1, the polarization plane of the incident light does not rotate through the EO modulator 124A (in this case, the polarization prism is transmitted), and the polarization plane of the incident light rotates through 90 ° through the EO modulator 123A (this In this case, only the two-beam interference exposure of the laser beam path 129 is performed during the time T1. Next, during the time T2, the EO modulator 124A is controlled so that the polarization plane of the incident light is rotated by 90 °, the EO modulator 123A is controlled so that the polarization plane of the incident light is not rotated, and the EO modulator 125A is controlled. When the polarization plane is controlled to rotate 90 °, the laser beam path 130 is selected, and only the two-beam interference exposure of the laser beam path 130 is performed within that time. Furthermore, during the time T3, the EO modulator 124A has a polarization plane of incident light rotated by 90 °, the EO modulator 123A has a polarization plane of incident light not rotated, and the EO modulator 125A has a polarization plane of incident light. When controlled so as not to rotate, the laser beam path 131 is selected, and only the two-beam interference exposure of the laser beam path 131 is performed within that time.
[0030]
Note that it is desirable that the repetition frequency when performing time division interference exposure is 1 Hz or more. When time-division interference exposure is performed at a repetition frequency of 1 Hz or less, the periodic structures are not formed uniformly, and problems such as a decrease in reflected light intensity occur during display as a reflective color liquid crystal display device. Further, by controlling the exposure time ratio (duty) within one period, that is, the ratio of the exposure times T1, T2, and T3, the ratio of the occupied area of each periodic structure or the ratio between the transparent solid material layer and the liquid crystal material layer By adjusting the ratio between the transparent solid material and the liquid crystal material, it is possible to adjust the reflected light intensity from each periodic structure at the time of display as a reflective color liquid crystal display device and to achieve color balance. It is also possible to achieve color balance by adjusting the exposure intensity of the three types of two-beam interference exposure.
The EO modulator for switching the optical path of the laser light may be another modulator such as an AO (acousto-optic) modulator. The polarization prisms 123A and 124A of the polarization selectors 123 and 124 may be replaced with polarizing plates that transmit only light having a specific polarization plane. In this case, the light absorption plates 126 and 127 are not necessary. In addition, three laser optical paths can be formed by using only one laser light source and two optical path selectors, or three optical path selectors (such as an optical modulator and a polarizing plate) using three laser light sources. By using it, three laser light paths can be formed.
[0031]
As shown in FIG. 10, in the two-beam exposure used for manufacturing the light control layer of the reflective color liquid crystal display device of the present embodiment, a pair of transparent substrates 153 on which transparent electrodes (not shown) are formed, The laser beam 151 is incident on one transparent substrate 153 of the HPDLC precursor cell 155 sandwiching the HPDLC precursor between 154 from the direction inclined with respect to the normal direction of the surface, and the other transparent substrate 154 is incident on the other transparent substrate 154. The laser beam 152 is incident from a direction closer to the normal direction of the surface. In this case, since the laser light incident from either substrate is a plane wave, the layer interface between the transparent solid material layer 158A and the liquid crystal material layer 158B formed by the interference of the two light beams is flat, and the angle formed by the two light beams. Is formed so as to extend in a direction bisecting. Therefore, in the manufacturing method of the present embodiment in which the two light beams 151 and 152 are incident at different angles with respect to the normal direction of the substrate surface, the periodic structure composed of the transparent solid material layer 158A and the liquid crystal material layer 158B is formed. The layer interface is formed inclined with respect to the substrate surface. The second of the present invention Reference example The light control layer of the reflective color liquid crystal display device is formed as described above.
[0032]
Book Reference example The reflective color liquid crystal display device can be easily produced by forming a color filter on one of the transparent substrates after the light control layer is formed between the two transparent substrates provided with electrodes. At this time, the color filter can be directly formed on one of the substrates sandwiching the light control layer using a technique such as a dyeing method or a printing method. Another substrate on which a filter is formed may be attached. These color filters may be formed on the surface opposite to the light control layer of either one of the substrates sandwiching the light control layer, or between or between the electrodes on the light control layer side. You may form between optical layers.
Further, after the light control layer is formed between the two substrates, it is also possible to peel one substrate and attach a substrate having a color filter prepared separately. For example, if one of the pair of substrates of the cell in which the light control layer is formed is made of a transparent plastic or the like, the substrate has low adhesion to the transparent solid material layer forming the periodic structure. Such a substrate can be easily peeled off after forming the periodic structure without causing deformation of the transparent solid material layer. Therefore, one substrate is peeled while the periodic structure of the transparent solid material layer and the liquid crystal material layer is maintained, and the color filter is bonded by attaching a substrate having a color filter to the surface from which the substrate is peeled. It is possible to provide.
A light absorbing layer or a light absorbing plate is formed on the other substrate. In some cases, the light absorption layer or the light absorption plate may be omitted.
[0033]
[No. 2 Embodiment of
FIG. 11 shows the first of the present invention. 2 It is sectional drawing for demonstrating the two-beam exposure of the manufacturing method of this embodiment. In the manufacturing method of the present embodiment, a curved periodic structure including a transparent solid material layer and a liquid crystal material layer is formed from a mixture of a photosensitive transparent solid material precursor and a liquid crystal material.
As shown in FIG. 11, in the two-beam exposure used for manufacturing the light control layer of the reflective color liquid crystal display device of the present embodiment, a pair of transparent substrates 163 on which transparent electrodes (not shown) are formed, Laser light 161 is incident on one transparent substrate 163 of the HPDLC precursor cell 165 sandwiching the HPDLC precursor between 164 from a direction inclined with respect to the normal direction of the surface. A lenticular lens array 166 having a semi-cylindrical cross-sectional shape is attached to the surface of the other transparent substrate 164, and through this lenticular lens array 166, the surface of the transparent substrate 164 is positioned in the normal direction of the substrate relative to the laser beam 161. Laser light 162 is incident from a near direction. The laser light 162 incident from the lenticular lens array 166 is focused once inside the transparent substrate 164 and then emitted as a divergent wave into the HPDLC precursor. The laser beam 162 emitted as a divergent wave to the HPDLC precursor interferes with the laser beam 161 incident from the transparent substrate 163 to form a curved interference light fringe. A transparent solid material layer 168A is formed in a region where the light intensity of the interference light fringes is high, and a liquid crystal material layer 168B is formed in a region where the light intensity is low. The transparent solid material layer 168A and the liquid crystal material layer 168B form a curved periodic structure including a high refractive index layer and a low refractive index layer. In this case, since the two laser beams 161 and 162 are incident from different angles with respect to the normal direction of the substrate, the interference light fringes are inclined with respect to the substrate surface. Therefore, the transparent solid material layer 168A and The curved layer interface composed of the liquid crystal material layer 168B is also inclined with respect to the substrate surface.
Note that the lenticular lens array may be attached not only to one substrate but also to both substrates. Further, as the lens array, not only a lenticular lens array but also a microlens array in which a large number of fine convex lenses are two-dimensionally formed can be used.
For example, an optical system and a method for forming a color filter other than those described above in the manufacturing method of the reflective color liquid crystal display device of the present embodiment 1 This is the same as the manufacturing method of the embodiment.
[0034]
[Example 1]
FIG. 12 is a cross-sectional view of the interference exposure cell in Example 1 of the present invention.
First, two transparent glass substrates provided with ITO transparent electrodes were bonded together via a spacer to produce an empty cell having a cell thickness of 8 μm. BL36 (manufactured by Merck) as a nematic liquid crystal material: 30% by weight, Laxtrac LCR208 (manufactured by Toa Gosei) as a transparent solid material precursor is 30% by weight, and a mixture of 70% by weight of M1200 (manufactured by Toa Gosei): 69.98% by weight, BTTB: 0.01% by weight as a photopolymerization initiator, and 488 nm photosensitizing dye: 0.005% by weight, 532 nm photosensitizing dye: 0.005% by weight The resulting mixture was formulated as an HPDLC composition precursor. The nematic liquid crystal material BL36 has an ordinary ray refractive index of 1.527 and an extraordinary ray refractive index of 1.794. Moreover, the refractive indexes of LUX TRACK LCR208 and M1200 used as the transparent solid material precursor are 1.50 and 1.49 to 1.50, respectively. The HPDLC precursor cell was produced by injecting the HPDLC composition precursor into the previously produced empty cell.
[0035]
Next, as shown in FIG. 1 In the optical system of the embodiment, a laser having a wavelength of 488 nm was used as the laser light source 121 and a laser having a wavelength of 532 nm was used as the laser light source 122, respectively. Here, one of the two optical paths by the 488 nm laser beam is used for forming a periodic structure that reflects blue light, and the other laser optical path 131 is used for forming a periodic structure that reflects green light. Further, the laser beam path 129 of the 532 nm laser beam was used to form a periodic structure that reflects red light. At this time, in order to form a periodic structure that reflects light having a wavelength in the red region, it is necessary to cause 532 nm laser light to be incident on the HPDLC composition precursor at an incident angle of 40 to 45 ° with respect to the substrate surface. there were. However, Snell's law must be satisfied when laser light is incident on the glass substrate and the HPDLC composition precursor from the air. However, the refractive index of the glass substrate and the HPDLC composition precursor used in this example is about 1.50 to 1.52, and the HPDLC composition precursor has a refractive index of 40 to 45 ° while satisfying Snell's law. There was no condition for making laser light incident on the glass substrate from the air so as to make it incident at an incident angle, or even if it existed, the laser light had to be incident almost parallel to the substrate surface. In this state, it was impossible to satisfactorily form the transparent solid material layer.
[0036]
Therefore, as shown in FIG. 12, the transparent substrates 173 and 174 of the HPDLC precursor cell 175 in which the HPDLC composition precursor 171 is sandwiched between the transparent substrates 173 and 174 on which a pair of electrodes (not shown) are formed. The right-angle prisms 178A and 178B were bonded to the surface on the side in contact with air, and laser light was incident on the HPDLC precursor cell 175 via the right-angle prisms 178A and 178B. The refractive indexes of the right-angle prisms 178A and 178B are substantially the same as those of the glass substrates 173 and 174 and the HPDLC composition precursor 171. By adopting such a configuration, it was possible to easily produce a periodic structure capable of reflecting red light having a long wavelength.
[0037]
The HPDLC precursor cell in which the right-angle prisms were bonded to both sides of the substrate in this way was placed in the above-described interference exposure optical system, and time-division interference exposure was performed at room temperature for 60 seconds to produce an HPDLC element that reflects white.
At this time, by controlling the wavelength of the light source of the two-beam interference exposure, the crossing angle of the two lights used for the two-beam interference exposure and the incident angle to the cell, the selective reflection wavelength of the produced reflective color liquid crystal display device, It is possible to adjust the incident direction of incident white light and the reflection direction of reflected light. In the present embodiment, the incident direction of incident white light is inclined by 30 ° with respect to the normal direction of the substrate surface, and the reflection direction of reflected light is the normal direction of the substrate surface as follows. Set.
That is, the crossing angle of the two laser beams reflected by the mirror pair 133B in one of the two optical paths by the 488 nm laser beam is 180 °, and the right angle prism attached to the HPDLC precursor cell 175 is obtained. Both of the incident angles were 57.4 °, and a periodic structure reflecting blue light was formed. The crossing angle of the two laser beams reflected by the mirror pair 133C in the other laser beam path 131 is 153.2 °, and the incident angle to the right-angle prism attached to the HPDLC precursor cell 175 is 47.5 ° and 15 °. A periodic structure reflecting green light was formed at .7 °. The crossing angle of the two laser beams reflected by the mirror pair 133A in the laser beam path 129 by the 532 nm laser beam is 121 °, and the incident angles to the right-angled prism attached to the HPDLC precursor cell 175 are 0 ° and 31 °. A periodic structure reflecting red light was formed.
[0038]
Further, the optical path control signal generator 128 performed time-division exposure while synchronizing the EO modulators 123A, 124A, and 125A. The period of time-division exposure was 10 Hz, and the duty ratio of exposure by the laser light paths 130, 131, and 129 was 3: 3: 4.
Finally, a substrate having a color filter on the incident light side of the HPDLC element and a substrate having a light absorption layer on the opposite side were bonded to complete the reflective color liquid crystal display device of this example.
[0039]
The reflection type color liquid crystal display device thus manufactured was irradiated with white light from a direction inclined by 30 ° with respect to the normal direction of the substrate, and the angle dependency of the luminance of the reflected light was measured. Both green and blue reflected light were concentrated and emitted in the normal direction of the substrate surface. Moreover, the peak of the wavelength of blue, green, and red light of the reflected light measured was 483 nm, 536 nm, and 616 nm, respectively.
When the reflection / transmission state was measured by applying a voltage to the reflective color liquid crystal display device, the reflection state was shown when no voltage was applied, and the transmission state was shown when a sufficient voltage was applied.
Due to such optical characteristics and reflection / transmission voltage dependency, this embodiment Made by The reflective color liquid crystal display device is the second Reference example It is clear that this is a reflective color liquid crystal display device.
[0040]
[Example 2]
FIG. 13 is a cross-sectional view of an interference exposure cell according to Embodiment 2 of the present invention.
First, an HPDLC precursor cell was produced under the same conditions as in Example 1. Next, as shown in FIG. 13, one substrate 188B of an HPDLC precursor cell 185 in which an HPDLC composition precursor 181 is sandwiched between transparent substrates 183 and 184 on which a pair of electrodes (not shown) is formed. Then, a lenticular lens array 186 in which semi-cylindrical lenses are arranged in an array with a groove pitch of 5.6 / mm was bonded. Next, right-angle prisms 188B and 188A were bonded to the lenticular lens array 186 and the other substrate 188A of the HPDLC precursor cell 185, respectively. The refractive indexes of the right-angle prisms 188A and 188B are substantially the same as the refractive indexes of the glass substrates 183 and 184 and the HPDLC composition precursor 181.
[0041]
The HPDLC precursor cell 185 bonded with the lenticular lens array 186 and the prisms 188A and 188B is placed in the time-division interference exposure optical system of Example 1 and subjected to time-division interference exposure at room temperature for 60 seconds to reflect the white color. An HPDLC element was prepared. Finally, after removing the lenticular lens array and the right-angle prism, the color filter substrate and the light absorption substrate were bonded together in the same manner as in Example 1 to complete the reflective color liquid crystal display device of this example.
[0042]
The reflection-type color liquid crystal display device thus manufactured was irradiated with white light from a direction inclined by 30 ° with respect to the normal direction of the substrate, and the angle dependence of the luminance of the reflected light was measured. It was observed that a very large viewing angle was obtained for both green and red light compared to the reflective color liquid crystal display device of Example 1. In addition, the luminance was almost constant within the viewing angle. Furthermore, it was observed that the viewing angle depends on the radius of curvature of the lenticular lens array. The measured peak wavelengths of blue, green, and red light of the reflected light were the same as those in Example 1.
When the reflection / transmission state was measured by applying a voltage to the reflective color liquid crystal display device, the reflection state was shown when no voltage was applied, and the transmission state was shown when a sufficient voltage was applied.
[0043]
Example 3
One transparent substrate having an ITO electrode and one Arton film (transparent plastic film made by JSR) were bonded together via a spacer to produce an empty cell having a cell thickness of 5 μm. Further, under the same conditions as in Example 1, this empty cell was filled with an HPDLC bioprecursor to produce an HPDLC precursor cell, and then an time division interference exposure was performed to produce an HPDLC element that reflects white light. . The Arton film was peeled off from the produced element, and then a color filter substrate having an ITO electrode was bonded to the surface from which the Arton film was peeled off. Further, in the same manner as in Example 1, a light absorbing substrate was bonded to the other substrate to complete a reflective color liquid crystal display device of this example.
The reflection-type color liquid crystal display device thus obtained had the same optical characteristics and reflection / transmission voltage dependency as those in Example 1.
[0044]
Although the present invention has been described based on the preferred embodiments, the reflective color liquid crystal display device of the present invention has been described. Manufacturing method And its manufacture apparatus Is not limited to the above-described embodiment, but a reflective color liquid crystal display device in which various changes are made without changing the gist of the present invention. Manufacturing method And its manufacture apparatus Are also included within the scope of the present invention. For example, the transparent solid precursor is not limited to a mixture of LUXTRAC LCR208 and M1200, and any transparent material that is curable with respect to laser light used for two-beam interference exposure can be used. Further, the liquid crystal material is not limited to nematic liquid crystal, and is not limited to BL36, and any liquid crystal having a difference between the ordinary light refractive index and the extraordinary light refractive index of about 0.05 or more can be used. Can be used. Further, a photopolymerization retarder may be added to the HPDLC composition precursor. Two or more kinds of photopolymerization initiators and / or photopolymerization retarders may be added. The light absorption layer may be omitted or may be used as an electrode with conductivity added. The wavelength of the laser beam used for the two-beam interference exposure is not limited to 488 nm and 532 nm, and any laser beam having a wavelength in the ultraviolet to infrared region can be used. The right-angle prism for guiding laser light into the HPDLC precursor cell is not limited to a right-angle prism, and may be a prism having an acute angle or an obtuse angle. Further, it may be formed only on one side, not on both sides of the substrate. Further, an antireflection layer may be formed on the substrate surface of the cell during the two-beam interference exposure. When the laser light is guided into the cell through the prism or lenticular lens, a refractive index matching material such as oil or water may be applied between the prism or lenticular lens and the transparent substrate.
[0045]
【Effect of the invention】
As described above, in the method for manufacturing a reflective color liquid crystal display device according to the present invention, a light control layer that reflects white light in order to perform three types of two-beam interference exposure on the HPDLC precursor cell in a time-sharing manner. Can be produced by a single interference exposure. Therefore, it is not necessary to perform interference exposure through a mask, and the manufacturing process can be simplified and the cost can be reduced.
[Brief description of the drawings]
FIG. 1 shows the present invention. Produced by Sectional drawing of the basic structure of a reflection type color liquid crystal display device.
FIG. 2 shows the first of the present invention Reference example Sectional drawing of a reflective type color liquid crystal display device.
FIG. 3 shows the first of the present invention. Reference example Sectional drawing of a light control layer.
FIG. 4 shows the second of the present invention. Reference example Sectional drawing of a reflective type color liquid crystal display device.
FIG. 5 shows a third embodiment of the present invention. Reference example Sectional drawing of a reflective type color liquid crystal display device.
6 is a cross-sectional view of a part of a light control layer of the reflective color liquid crystal display device of FIG.
7 is a diagram of incident / reflected rays on the light control layer in FIG.
FIG. 8 shows the fourth aspect of the present invention. Reference example Sectional drawing of a reflective type color liquid crystal display device.
FIG. 9 shows the first of the present invention. 1 The layout of the optical system of the embodiment.
FIG. 10 shows the first of the present invention. 1 Sectional drawing for demonstrating the two-beam exposure of embodiment of this.
FIG. 11 shows the first of the present invention. 2 Sectional drawing for demonstrating the two-beam exposure of embodiment of this.
FIG. 12 is a cross-sectional view of an interference exposure cell in Embodiment 1 of the invention.
FIG. 13 is a cross-sectional view of an interference exposure cell according to Embodiment 2 of the present invention.
[Explanation of symbols]
1, 11, 21, 31, 41, 111 Light control layer
2, 12, 32, 42, 112, 2A, 2B, 2C, 12A, 12B, 12C, 32A, 32B, 32C, 42A, 42B, 42C, 52A, 52B, 52C, 112A, 112B, 112C Color filter
3,4 substrates
13, 14, 33, 34, 43, 44, 113, 114, 153, 154, 163, 164, 173, 174, 183, 184 Transparent substrate
5, 6 electrodes
15, 16, 35, 36, 45, 46, 115, 116 Transparent electrode
7, 17, 37, 47, 117 Light absorption layer
18, 19, 20, 28, 29, 48, 49, 50, 118, 119, 120 Periodic structure
18A, 19A, 20A, 28A, 29A, 38A, 39A, 40A, 48A, 49A, 50A, 118A, 119A, 120A High refractive index layer
18B, 19B, 20B, 28B, 29B, 38B, 39B, 40B, 48B, 49B, 50B, 118B, 119B, 120B Low refractive index layer
101 layer interface
102 vertices
103, 106 Tangent plane
104, 107 normal
105 Any point
108 Small parts
121, 122 Laser light source
123, 124, 125 Optical path selector
123A, 124A, 125A EO modulator
123B, 124B, 125B Polarizing prism
126, 127 light absorption plate
128 Optical path control signal generator
129, 130, 131 Laser path
132A, 132B, 132C Beam splitter
133A, 133B, 133C Mirror pair
134, 155, 165, 175, 185 HPDLC precursor cell
140, 166, 186 Lenticular lens array
151, 152, 161, 162 Laser light
158A, 168A Transparent solid material layer
158B, 168B Liquid crystal material layer
171, 181 HPDLC composition precursor
178A, 178B, 188A, 188B Right angle prism

Claims (15)

A step of injecting a mixed liquid containing at least a transparent solid material precursor and a liquid crystal material into a cell in which a pair of transparent substrates provided with transparent electrodes are bonded via a spacer; and the cell into which the mixed liquid is injected Two-beam interference exposure, in which two light beams having the same wavelength are irradiated from different directions to form a photocuring layer of the transparent solid material precursor having a periodicity by interference thereof, the periodicity of the formed photocuring layer is method of manufacturing a reflective type color liquid crystal display device characterized by having a step of performing time division for different 2 or 3 kinds. Method of manufacturing a reflective type color liquid crystal display device according to claim 1, wherein the photopolymerization initiator to the mixed solution is added. Reflecting described a step of performing a time division the two-beam interference exposure, at least one transparent substrate provided with said pair of transparent electrodes, to claim 1 or 2, characterized in that by arranging the rectangular prism Type liquid crystal display device manufacturing method. Method of manufacturing a reflective type color liquid crystal display device according to any one of claims 1 to 3, characterized in that the repetition frequency of time division of two-beam interference exposure is not less than 1 Hz. Due to the time-divided two-beam interference exposure, the mixture ratio of the transparent solid material and the liquid crystal material is high, and the mixture ratio of the liquid crystal material layer or the liquid crystal material is high. The reflective color according to any one of claims 1 to 4, wherein a plurality of periodic structures having different lamination period intervals are formed by laminating a mixed layer of a transparent solid material and a liquid crystal material. A method for manufacturing a liquid crystal display device. According to claim 5, characterized in that it comprises means for controlling the relative proportions of each of the occupied area of the means or the plurality of periodic structures for controlling the mixing ratio of the said transparent solid material crystal material A method for manufacturing a reflective color liquid crystal display device. 7. The reflective color liquid crystal display device according to claim 6 , wherein an exposure time ratio (duty) of each two-beam interference exposure within one cycle in the time-division two-beam interference exposure is variable. Method. The two-beam interference exposure, at least one of said pair of transparent substrates, a reflective type color liquid crystal according to any one of claims 1 to 7 which is characterized in that by arranging a microlens array or a lenticular lens array Manufacturing method of display device. After performing the two-beam interference exposure method of the reflection-type color liquid crystal display device according to any one of claims 1 to 8, characterized in that a step of forming a color filter on one of the pair of substrates . The step of peeling one of the pair of substrates and performing the step of attaching a substrate having a color filter to the surface from which the substrates have been peeled off is performed after the two-beam interference exposure. A method for producing a reflective color liquid crystal display device according to any one of 1 to 8 . Two-beam interference exposure is performed on the mixed solution in the cell into which the mixed solution containing the photosensitive transparent solid material precursor and the liquid crystal material is injected to form a plurality of periodic structures having different stacking cycle intervals in the cell. And at least one laser light source, at least one light path switching means for switching a traveling direction of light emitted from the laser light source, and a plurality of light beams divided from the light path switching means. There are one beam splitter, a plurality of mirror pairs that reflect light emitted from each of the beam splitters toward two surfaces of the cell, and a beam splitter into which light is incident simultaneously among the plurality of beam splitters. An optical path control signal generator for controlling the optical path switching means so that only one is provided. Location. Two-beam interference exposure is performed on the mixed solution in the cell into which the mixed solution containing the photosensitive transparent solid material precursor and the liquid crystal material is injected to form a plurality of periodic structures having different stacking cycle intervals in the cell. An apparatus for controlling at least two laser light sources, an optical switch on the optical path of the light emitted from the laser light source and controlling transmission / non-transmission of the light, and light emitted from the optical switch. A plurality of beam splitters that divide into two, a plurality of mirror pairs that reflect the light emitted from each of the beam splitters toward two surfaces of the cell, and light incident simultaneously among the plurality of beam splitters And an optical path control signal generator for controlling the optical switch so that only one beam splitter is provided. Two-beam interference exposure is performed on the mixed solution in the cell into which the mixed solution containing the photosensitive transparent solid material precursor and the liquid crystal material is injected to form a plurality of periodic structures having different stacking cycle intervals in the cell. A first and second laser light source, and first and second optical switches that are on an optical path of light emitted from each of the laser light sources and that control transmission / non-transmission of the light, , An optical path switching means for switching the traveling direction of the light emitted from the first optical switch, two lights emitted from the optical path switching means, and two lights emitted from the second optical switch, respectively. Three beamsplitters to be split, three pairs of mirrors that reflect the light emitted from each of the beam splitters toward the two surfaces of the cell, and light incident simultaneously among the three beam splitters Be done As over beam splitter is only one, the reflection type apparatus for manufacturing a color liquid crystal display device characterized by comprising: a light path control signal generator for controlling said optical switch and the optical path switching means. 2. The optical path switching unit includes an optical modulator that rotates a polarization plane of incident light, and a polarizer that switches a direction of light emitted according to a polarization state of incident light. 14. A manufacturing apparatus for a reflective color liquid crystal display device according to 1 or 13 . Said optical switch, an optical modulator for rotating the plane of polarization of the incident light, particular claim 1 2 or 13, wherein the light having a polarization plane and a polarizing plate for selectively transmitting Manufacturing apparatus of reflective type color liquid crystal display device.

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