JP2007212713A - Electrooptical device and electronic apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrooptical device with which uneven luminance on a display screen is suppressed without increasing thickness of the device as a whole. <P>SOLUTION: The electrooptical device comprises a display panel and an illuminator. The display panel has a pair of substrates, an electro-optic material interposed between the pair of substrates, and a plurality of sub-pixels arranged thereon. The illuminator has a plurality of light sources and illuminates the display panel by making light emitted from the light sources be transmitted therethrough. Semiconductor devices which generate electric currents when light is made incident thereon are aligned on the display panel in parallel with an aligning direction of the plurality of light sources. The semiconductor devices function as optical sensors. A light source control means controls respective luminance of the plurality of light sources based on the magnitude of the electric current. Thereby, uneven luminance on the display screen is suppressed with respect to the aligning direction of the plurality of light sources. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an electro-optical device suitable for displaying various information.

  In the liquid crystal display device, an illumination device is provided on the back side of the liquid crystal display panel in order to perform transmissive display. A lighting device having LEDs (Light Emitting Diodes) of red, green, and blue as light sources generates white light by mixing light emitted from each LED, and the generated white light is displayed on a liquid crystal display. Irradiate the back side of the panel. The liquid crystal display device displays color light by transmitting the white light emitted from the illumination device to a color filter that transmits light of each wavelength of red, green, and blue stacked on the substrate of the liquid crystal display panel. Is realized. However, since each color LED has the property that the luminance characteristics change greatly due to temperature changes and changes over time, the color of the mixed white light changes, or luminance unevenness with different luminance depending on the location on the display screen may occur. There was a problem to do.

  The following Patent Document 1 includes a light source composed of RGB LEDs, a photosensor, and a control unit that adjusts the amount of light emitted from the light source based on a detection value from the photosensor. A planar light source device and a display device are described.

Japanese Patent Laid-Open No. 2005-71702

  However, in the planar light source device and the display device described in Patent Document 1, since the optical sensor is added as an independent module, the size of the entire device increases as the optical sensor is added. Further, when manufacturing such an apparatus, a manufacturing process for adding an optical sensor is required in addition to the manufacturing process of the apparatus itself.

  The present invention has been made in view of the above points. In an electro-optical device, the function of an optical sensor is added without increasing the size of the entire device, and a display screen generated due to a temperature change or a change with time. It is an object to suppress the above luminance unevenness.

  In one aspect of the present invention, an electro-optical device includes a pair of substrates, a display panel including an electro-optical material sandwiched between the pair of substrates, and provided with a plurality of subpixels. An illumination device that illuminates the display panel by transmitting light emitted from the plurality of light sources, and is arranged on the display panel in parallel with an arrangement direction of the plurality of light sources. A plurality of semiconductor elements that generate a current when light emitted from the light source enters, and a light source control unit that controls the brightness of each of the plurality of light sources based on the magnitude of the current.

  The electro-optical device is, for example, a liquid crystal display device, and includes a display panel and a lighting device. The display panel is a liquid crystal display panel, for example, and includes a pair of substrates and an electro-optical material sandwiched between the pair of substrates, and is provided with a plurality of sub-pixels. The illumination device has a plurality of light sources, and illuminates the display panel by transmitting light emitted from the light sources. A plurality of semiconductor elements are arranged on the display panel in parallel with the arrangement direction of the plurality of light sources. The plurality of semiconductor elements generate current when light emitted from the plurality of light sources is incident. That is, this semiconductor element functions as an optical sensor. Examples of the semiconductor element include a PIN (p-intrinsic-n Diode) diode. In this way, by forming a semiconductor element on a display panel as an optical sensor, the size of the optical sensor can be reduced and the arrangement of the optical sensor can be reduced compared to adding an optical sensor manufactured as an independent module. Since the degree of freedom can be increased, it is not necessary to enlarge the entire apparatus. The light source control means controls the luminance of each of the plurality of light sources based on the magnitude of the current. By doing so, luminance unevenness on the display screen can be suppressed in the arrangement direction of the plurality of light sources.

  In one aspect of the electro-optical device, the semiconductor element is formed on one of the pair of substrates, and the same surface as a surface on which the switching element for driving the sub-pixel is formed. Is formed. Thus, the semiconductor element, that is, the optical sensor can be simultaneously formed in the process of forming the switching element. Thereby, it is not necessary to provide a new process for forming or installing the optical sensor, and the manufacturing cost can be reduced.

  In another aspect of the electro-optical device, a light-shielding film that shields light is formed on the inner surface of the semiconductor element. As a result, external light incident on the display panel can be shielded from the semiconductor element, and only light emitted from the illumination device can be incident.

  In a preferred embodiment of the electro-optical device, the semiconductor element is a PIN diode, and the switching element is a polysilicon TFT.

  In another aspect of the electro-optical device, the semiconductor element is formed outside an effective display area of the display panel. As a result, the display image is not affected.

  In another aspect of the electro-optical device, the plurality of semiconductor elements include a plurality of first semiconductor elements that are incident before light emitted from the plurality of light sources is mixed, and the plurality of light sources. A plurality of second semiconductor elements that are incident after light emitted from the light source is mixed, and the light source control means further includes a potential difference when the plurality of first semiconductors are connected in series, and The brightness of each of the plurality of light sources is controlled based on a potential difference when a plurality of second semiconductors are connected in series. This makes it possible to suppress luminance unevenness on the display screen in the light emission direction.

  In another aspect of the electro-optical device, the plurality of light sources includes a plurality of light sources that respectively emit light of each color of RGB, and the plurality of semiconductor elements include each of the plurality of light sources. The light emitted from the plurality of light sources is incident on the plurality of semiconductor elements before being mixed. Thereby, white balance can also be adjusted.

  In a preferred embodiment of the above electro-optical device, the plurality of light sources are a plurality of light source packages in which light emitters that emit light of a plurality of colors are packaged into one. Here, the light emitter is, for example, an LED.

  In a preferred embodiment of the electro-optical device, the display panel is disposed on the other substrate of the pair of substrates so as to correspond to the plurality of sub-pixels. The second colored layer has four colored regions composed of colored layers of the third and fourth colors arbitrarily selected from hues of blue to yellow.

  In a preferred embodiment of the electro-optical device, the display panel is disposed on the other substrate of the pair of substrates corresponding to the plurality of sub-pixels, and the wavelength peak of light transmitted through the colored region Is composed of a first colored region at 415-500 nm, a second colored region at 600 nm or more, a third colored region at 485-535 nm, and a fourth colored region at 500-590 nm. It has a colored area.

  In still another aspect of the invention, an electronic apparatus including the electro-optical device described above in a display unit can be configured.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

[First Embodiment]
First, the configuration and the like of the liquid crystal display device 100 according to the first embodiment will be described with reference to FIGS.

  FIG. 1 is a plan view schematically showing a schematic configuration of the liquid crystal display device 100 according to the first embodiment. In FIG. 1, a color filter substrate 92 is disposed on the front side (observation side) of the paper, and an element substrate 91 is disposed on the back side of the paper. In FIG. 1, the vertical direction (column direction) on the paper surface is defined as the Y direction, and the horizontal direction (row direction) on the paper surface is defined as the X direction. In FIG. 1, each region corresponding to R (red), G1 (green 1), B (blue), and G2 (green 2) represents one sub-pixel SG, and R, G1, B, A sub-pixel SG of 1 row and 4 columns corresponding to G2 represents one display pixel AG. Here, G1 (green 1) and G2 (green 2) are two kinds of hues selected from hues from blue to yellow. In the first embodiment, as an example, G1 (green 1) generally indicates pure green indicated by G, and G2 (green 2) indicates yellowish green.

  FIG. 2 is an enlarged cross-sectional view of one display pixel AG along the cutting line AA ′ in the liquid crystal display device 100. As shown in FIG. 2, the liquid crystal display device 100 includes an illumination device 10, a liquid crystal display panel 30, a diffusion sheet 14, a prism sheet 15, and a reflection sheet 16. In the liquid crystal display panel 30, an element substrate 91 and a color filter substrate 92 disposed to face the element substrate 91 are bonded together via a frame-shaped sealing material 5, and liquid crystal is enclosed inside the sealing material 5. Thus, the liquid crystal layer 4 is formed. The liquid crystal used for the liquid crystal layer 4 is, for example, a TN (Twisted Nematic) type liquid crystal. The illumination device 10 is provided on the outer surface of the element substrate 91 of the liquid crystal display panel 30.

  The liquid crystal display device 100 according to the first embodiment is a liquid crystal display device for color display configured using four colors of R, G1, B, and G2, and uses a low-temperature type polysilicon TFT as a switching element. This is an active matrix drive type liquid crystal display device.

  A planar configuration of the element substrate 91 will be described. On the inner surface of the element substrate 91, a plurality of source lines 32, a plurality of gate lines 33, a plurality of polysilicon TFTs 37, a plurality of pixel electrodes 34, a driver IC 40, an external connection wiring 35, and an FPC (Flexible Printed Circuit). 41 or the like is formed or mounted.

  As shown in FIG. 1, the element substrate 91 has a protruding region 31 that protrudes outward from one side of the color filter substrate 92, and a driver IC 40 is mounted on the protruding region 31. A terminal (not shown) on the input side of the driver IC 40 is electrically connected to one end side of the plurality of external connection wirings 35, and the other end side of the plurality of external connection wirings 35 is electrically connected to the FPC 41. It is connected. Each source line 32 is formed so as to extend in the Y direction and at an appropriate interval in the X direction, and one end side of each source line 32 is connected to an output side terminal (not shown) of the driver IC 40. Electrically connected.

  Each gate line 33 includes a first wiring 33a formed so as to extend in the Y direction, and a second wiring 33b formed so as to extend in the X direction from the terminal portion of the first wiring 33a. ing. The second wiring 33 b of each gate line 33 is formed to extend in the direction intersecting each source line 32, that is, in the X direction and at an appropriate interval in the Y direction. One end of one wiring 33a is electrically connected to a terminal (not shown) on the output side of the driver IC 40. A polysilicon TFT 37 is provided at a position corresponding to the intersection of each source line 32 and each gate line 33 with the second wiring 33 b. Each polysilicon TFT 37 is provided with each source line 32, each gate line 33, and each pixel electrode 34. Etc. are electrically connected. Each polysilicon TFT 37 is provided at a position corresponding to each sub-pixel SG on the substrate 1 such as glass. An interlayer film 66 is mainly stacked on the substrate 1. The interlayer film is composed of a first interlayer film and a second interlayer film, which will be described in detail later. Each pixel electrode 34 is formed of a transparent conductive material such as ITO (Indium-Tin Oxide), for example, and is provided at a position corresponding to each sub-pixel SG on the interlayer film 66. Each pixel electrode 34 is electrically connected to the source line 32 and each polysilicon TFT 37 through a contact hole provided in the interlayer film 66.

  A region in which a plurality of display pixels AG are arranged in a matrix in the X and Y directions is an effective display region V (a region surrounded by a two-dot chain line). In the effective display area V, images such as letters, numbers, and figures are displayed.

  The area outside the effective display area V is a frame area 38 that does not contribute to display. As will be described in detail later, a plurality of optical sensors 60 are arranged in the frame region 38. Specifically, the optical sensor 60 is a semiconductor element such as a PIN (p-intrinsic-n Diode) diode. The photosensor 60 is electrically connected to the photodetection circuit 52 through the wiring 32a. The light detection circuit 52 detects light incident on the light sensor 60 by detecting a current generated by the light sensor 60.

  Next, the planar configuration of the color filter substrate 92 will be described. As shown in FIG. 2, the color filter substrate 92 is formed on a substrate 2 such as glass on a light shielding layer (generally referred to as “black matrix”, hereinafter simply abbreviated as “BM”), R, G1, B , G2 color layers 6R, 6G1, 6B, 6G2 and the common electrode 8 and the like. The BM is formed at a position that partitions the sub-pixels SG for each color. In the following description or drawings, when a component is shown without specifying the colors of R, G1, B, and G2, it is simply written as “colored layer 6”, and R, G1, B, and G2 In the case of showing the components by distinguishing colors, for example, “colored layer 6R” is used. The sub-pixels SG for each color of R, G1, B, and G2 include R, G1, B, and G2 colored layers 6R, 6G1, 6B, and 6G2, respectively. The colored layers 6R, 6G1, 6B, and 6G2 of R, G1, B, and G2 function as color filters for the respective colors. The common electrode 8 is made of a transparent conductive material such as ITO like the pixel electrode, and is formed over substantially the entire surface of the color filter substrate 92. The common electrode 8 is electrically connected to one end side of the wiring 36 in the corner area E1 of the sealing material 5, and the other end side of the wiring 36 is electrically connected to an output terminal corresponding to the COM of the driver IC 40. It is connected to the.

  Next, the illumination device 10 will be described with reference to FIG. The lighting device 10 includes a light guide plate 11 and a light source unit 12. The light source unit 12 emits light L to the end surface 11 c of the light guide plate 11. The light source unit 12 includes RGB (Light Emitting Diode) 13 for each color of RGB as a light source. Note that the position of the light source unit 12 in FIG. 2 is a convenient position for explanation, and is not an accurate position. As will be described in detail later, the light source unit 12 is precisely located at a position along the arrangement direction of the plurality of photosensors 60, where the light detection circuit 52 is shown in FIG.

  Light L emitted from the light source unit 12 enters the light guide plate 11 through an end surface (hereinafter referred to as “light incident end surface”) 11 c of the light guide plate 11, and is repeatedly reflected on the output surface 11 a and the reflection surface 11 b of the light guide plate 11. Change direction. The light L is emitted from the emission surface 11a of the light guide plate 11 toward the liquid crystal display panel 30 when the angle formed between the emission surface 11a of the light guide plate 11 and the light L exceeds a critical angle. The light L is emitted from the reflective surface 11b of the light guide plate 11 when the angle formed between the reflective surface 11b of the light guide plate 11 and the light L exceeds a critical angle. However, the light emitted from the reflection surface 11 b of the light guide plate 11 is reflected by the reflection sheet 16 that reflects the light and returned to the inside of the light guide plate 11.

  Light L emitted from the emission surface 11 a of the light guide plate 11 toward the liquid crystal display panel 30 passes through the diffusion sheet 14 and the prism sheet 15 and then passes through the liquid crystal display panel 30. The diffusion sheet 14 diffuses and emits the light L. The prism sheet 15 includes prism sheets 15a and 15b. Each of the prism sheets 15 a and 15 b has a prism shape whose cross-sectional shape is substantially triangular, and emits light L toward the liquid crystal display panel 30. The prism sheets 15a and 15b are arranged so that the ridgelines of the prism-shaped prisms are substantially perpendicular to each other. The liquid crystal display device 100 is illuminated by the light L passing through the liquid crystal display panel 30. Thereby, the liquid crystal display device 100 can display images, such as a character, a number, and a figure, and an observer can visually recognize an image.

  In the liquid crystal display device 100, G1, G2,..., Gm−1, Gm (m is a natural number) are generated by the driver IC 40 based on the signal and power from the FPC 41 side connected to the main board or the like of the electronic device. The gate lines 33 are sequentially selected one by one in order, and a gate signal of a selection voltage is supplied to the selected gate lines 33, while the other non-selected gate lines 33 are not selected. A voltage gate signal is provided. Then, the driver IC 40 applies source signals corresponding to display contents to the pixel electrodes 34 located at positions corresponding to the selected gate lines 33, respectively, corresponding S1, S2,..., Sn-1, Sn ( n is a natural number) and is supplied via the polysilicon TFT 37. As a result, the alignment state of the liquid crystal layer 4 is controlled, and the display state of the liquid crystal display device 100 is switched to the non-display state or the intermediate display state.

  The liquid crystal display device 100 according to the first embodiment is illustrated as a completely transmissive liquid crystal display device, but is not limited thereto, and a transflective liquid crystal display device may be used instead. Furthermore, the liquid crystal display device 100 according to the first embodiment is configured as four color layers 6R, 6G1, 6B, and 6G2 as a color filter, but is not limited thereto, and instead, a general liquid crystal Similarly to the display device, it may be composed of RGB color filters.

  Further, the liquid crystal display panel 30 is not limited to a liquid crystal display panel having a liquid crystal layer made of TN liquid crystal as described above. Instead, a VA (Vertical Alignment) method, an IPS (In Plane Switching) method, an FFS (Fringe) is used. It is also possible to use a liquid crystal display panel such as a field structure.

  In the first embodiment, a liquid crystal display panel is used as the display panel. However, the present invention is not limited to this. Instead, another display panel such as an organic EL (electro-luminescence) display panel is used as the display panel. It can also be used.

(Configuration of optical sensor)
Next, the configuration of the optical sensor will be described. FIG. 3 is an enlarged cross-sectional view of the optical sensor 60 along the cutting line CC ′ in the liquid crystal display device 100. On the element substrate 91, an optical sensor 60, here a PIN diode, is formed.

  As shown in FIG. 3, a silicon oxide film 64 is formed on the inner surface of the substrate 1. An i (intrinsic) layer 62, which is a layer of pure polysilicon (p-Si), is formed on the inner surface of the silicon oxide film 64 in the region where the optical sensor 60 is formed, and i layers are formed on both sides thereof. A high impurity concentration p + layer 61 in which boron (B) ions are implanted into polysilicon and a high impurity concentration N + layer 63 in which phosphorus (P) ions are implanted into polysilicon are formed. . The PIN diode as the optical sensor 60 is composed of the i layer 62, the p + layer 61, and the N + layer 63. A gate insulating film 65 is stacked on the inner surface of the oxide film 64. On the inner surface corresponding to the i layer 62 of the gate insulating film 65, a light shielding film 33a is laminated. A first interlayer film 66a is stacked on the inner surfaces of the gate insulating film 65 and the light shielding film 33a. A wiring 32a is formed on the inner surface of the first interlayer film 66a. A contact hole 67 is provided at a position corresponding to each of the p + layer 61 and the N + layer 63 in the gate insulating film 65 and the first interlayer film 66 a, and the wiring 32 a is connected to the p + layer 61 via the contact hole 67. And the N + layer 63 is electrically connected. Further, a second interlayer film 66b is formed on the inner surface.

  Here, in the frame region 38, the color filter substrate 92 is composed only of the substrate 2. That is, nothing is formed on the inner surface of the substrate 2 in the frame region 38. Therefore, the external light Lout incident on the liquid crystal display panel 30 passes through the substrate 2 and directly enters the optical sensor 60. However, as shown in FIG. 3, the external light Lout incident on the optical sensor 60 is shielded by the light shielding film 33a. Therefore, only the light L emitted from the illumination device 10 and transmitted through the substrate 1 enters the optical sensor 60.

  Since the optical sensor 60 is a PIN diode, a current flowing between the p + layer 61 and the N + layer 63 is generated when irradiated with light. The magnitude of the current changes according to the luminance of the incident light. Specifically, the greater the luminance of the light incident on the optical sensor 60, the greater the amount of current generated, and the smaller the luminance of the light, the smaller the amount of current generated.

  The optical sensor 60 supplies the current thus generated to the light detection circuit 52 through the wiring 32a. The light detection circuit 52 can detect light incident on the light sensor 60 when a current is supplied from the light sensor 60.

  The liquid crystal display device 100 according to the first embodiment is manufactured as an independent module by forming a semiconductor element such as a PIN diode that generates a current when light enters the liquid crystal display panel 30 to form an optical sensor. Rather than adding an optical sensor, the size of the optical sensor can be reduced and the degree of freedom of the arrangement can be increased, so that the entire apparatus does not have to be enlarged. Furthermore, since the optical sensor 60 is formed in the frame area 38 that does not contribute to the display, it does not affect the display image.

(Configuration of lighting device)
Next, the configuration of the illumination device 10 will be described. FIG. 4 is a block diagram illustrating a configuration of the illumination device 10.

  As shown in FIG. 4, the illumination device 10 includes a plurality of RGB LEDs 13R, 13G, and 13B provided in the light source unit 12, a plurality of LED drive circuits 51R, 51G, and 51B, and a control unit 53. .

  The LED drive circuit 51R is connected to the red LED 13R, the LED drive circuit 51G is connected to the green LED 13, and the LED drive circuit 51B is connected to the blue LED 13B. In the liquid crystal display device 100 according to the first embodiment, one LED drive circuit 51 is provided for each LED 13 provided in the light source unit 12.

  The LED drive circuit 51 is connected to a control unit 53 configured by a CPU (Central Processing Unit) or the like. The control unit 53 is connected to the light detection circuit 52 described above.

  The light detection circuit 52 includes an amplifier circuit (not shown). The light detection circuit 52 amplifies the current supplied from the optical sensor 60 by the amplifier circuit, and then supplies the current to the control unit 53.

  The control unit 53 transmits a control signal to each LED drive circuit 51 based on the magnitude of the current supplied from the light detection circuit 52. Each LED drive circuit 51 changes the pulse current passed through the LED 13 connected to the LED drive circuit 51 based on the control signal. Since one LED driving circuit 51 is provided for each LED 13 provided in the light source unit 12, the control unit 53 controls the luminance of each LED 13 provided in the light source unit 12. Can do. Therefore, the control unit 53 functions as a light source control unit in the present invention.

  The red LED 13R is supplied with current Ir by the LED drive circuit 51R. In FIG. 4, the flow of the current flowing through the red LED 13R is indicated by a solid line arrow. Thereby, the red LED 13R can emit red light. The flow of current flowing through each of the green LED 13G and the blue LED 13B is also indicated by broken-line arrows.

  The green LED 13G is supplied with a current Ig by the LED drive circuit 51G. Thereby, the green LED 13G can emit green light. The blue LED 13B is supplied with a current Ib by the LED drive circuit 51B. Thereby, the blue LED 13B can emit blue light. The currents Ir, Ig, and Ib are pulse currents.

  FIG. 5 shows a circuit diagram of an LED drive circuit 51R according to the first embodiment as an example. The red LED drive circuit 51R includes a current limiting resistor Rr and a power source Vr. The magnitude of the current limiting resistor Rr is determined by the allowable value of the current Ir that can flow through the red LED 13R. The power supply Vr supplies a current Ir as a pulse current to the red LED 13R. The width and timing of the pulse current supplied to the red LED 13R can be changed by controlling the power supply Vr. Each of the LED drive circuit 51G and the LED drive circuit 51B has a power source for supplying currents Ig and Ib to the electrically connected green LED 13G and blue LED 13B, respectively, similarly to the LED drive circuit 51R.

  FIG. 6 is an example of a timing chart showing a driving sequence of each color LED 13 in the illumination device 10 according to the first embodiment. In FIG. 6, “ON” of each color LED 13 indicates a lighting state, and “OFF” indicates a light-off state.

  In the illuminating device 10 which concerns on 1st Embodiment, LED13 of each color becomes a structure which lights in a time division manner. Hereinafter, a period in which the LEDs 13 of each color are “ON” is referred to as a lighting period, and a period in which the LEDs 13 of each color are “OFF” is referred to as a non-lighting period. The chromaticity of the light L emitted from the illuminating device 10 and the chromaticity of the display screen of the liquid crystal display panel 30 are adjusted to a predetermined chromaticity by changing the lighting period of the LEDs 13 of each color of RGB in one frame period. The The lighting periods of the RGB LEDs 13 can be changed by changing the width of the pulse current supplied to the RGB LEDs 13. By doing in this way, the lighting time of LED13 of each color of RGB can be shortened rather than supplying constant current to LED13 of each color of RGB and always lighting, and reduction of power consumption can be aimed at.

  When the LEDs 13 of each color are lit in a time-division manner, the color of the light L looks different to the human eye depending on the period during which the LEDs 13 of each color are lit. Specifically, in the color of the light L, the color component of the light emitted from the LED 13 having a long lighting period is dark in one frame period, and the color component of the light emitted from the LED 13 having a short lighting period is getting thin. Generally, since one frame period is about 1/60 second, even if the LEDs 13 of each color are lit in a time-sharing manner, the color change is not recognized by human eyes due to the afterimage effect. .

  In the liquid crystal display device 100 according to the first embodiment, one LED drive circuit 51 is provided for each LED 13 provided in the light source unit 12, and the control unit 53 is supplied from the light detection circuit 52. A control signal is transmitted to each LED drive circuit 51 based on the magnitude of the current. Each LED drive circuit 51 changes the luminance of the light emitted from the LED 13 by changing the pulse current passed through the LED 13 connected to the LED drive circuit 51 based on the control signal. In other words, in the liquid crystal display device 100 according to the first embodiment, the control unit 53 determines the brightness of each LED 13 provided in the light source unit 12 based on the magnitude of the current supplied from the light detection circuit 52. Can be controlled.

(Positional relationship between light sensor and LED)
Next, the positional relationship between the LED 13 and the optical sensor 60 will be described. FIG. 7 is a plan view of the illumination device 10 and the element substrate 91. As shown in FIG. 7, in the liquid crystal display device 100 according to the first embodiment, the plurality of optical sensors 60 are arranged on the element substrate 91 of the liquid crystal display panel 30 in parallel with the arrangement direction of the LEDs 13 in the light source unit 12. Yes.

  By doing in this way, the control part 53 can pinpoint the place where the brightness | luminance unevenness has generate | occur | produced based on the electric current amount supplied to the photon detection circuit 52 from each photosensor 60. FIG. For example, if the amount of current supplied from the predetermined photosensor 60 is smaller than the amount of current supplied from other photosensors 60, luminance unevenness occurs in the portion where the predetermined photosensor 60 is installed. Will be. This is presumably because the brightness of the LED 13 located closest to the predetermined optical sensor 60 is low. At this time, the control unit 53 increases the luminance of the LED 13 located closest to the predetermined optical sensor 60. Thereby, the brightness nonuniformity on a display screen can be suppressed about the arrangement direction of LED13.

  In the liquid crystal display device 100 according to the first embodiment, as shown in FIG. 7, one optical sensor 60 is provided in the vicinity of the light source unit 12 corresponding to each LED 13. The emitted light is configured to enter each corresponding optical sensor 60 before being mixed. By doing in this way, the control part 53 can detect the brightness | luminance of the component for each color of RGB of the light L radiate | emitted from an illuminating device. Thereby, the control part 53 can also adjust white balance by adjusting the brightness | luminance of each LED13 based on the electric current amount supplied to the photon detection circuit 52 from each photosensor 60. FIG.

(LED current control processing)
Next, LED current control processing in the liquid crystal display device 100 according to the first embodiment will be described. The brightness of the light emitted from the RGB LEDs 13 changes with temperature and time. As described above, the change in the luminance of the light emitted from the LEDs 13 for each color of RGB is caused by uneven luminance on the display screen or the white balance of the light L emitted from the illumination device 10 being broken. Will be invited. Therefore, it is necessary to adjust the luminance of each color of light emitted from each of the RGB LEDs 13 every time the luminance of the light changes. This LED current control process will be described with reference to the flowchart of FIG.

  The light detection circuit 52 amplifies the current supplied from the plurality of light sensors 60 and supplies the amplified current to the control unit 53. The control unit 53 detects the luminance of the light emitted from each LED 13 based on the magnitude of the current (step S1). The control part 53 determines whether the brightness | luminance of the light radiate | emitted from each LED13 becomes predetermined brightness | luminance (step S2). Specifically, the control unit 53 determines whether or not the luminance of the light emitted from each LED 13 is equal to a predetermined luminance predetermined for each RGB color. The ratio of the predetermined brightness determined in advance for each RGB color is the ratio of the RGB brightness that provides desired white light. The control part 53 complete | finishes a process, when all the brightness | luminances of the light radiate | emitted from each LED13 are predetermined brightness | luminance (step S2: Yes). On the other hand, in the case where there is a luminance that does not become a predetermined luminance among the luminances of the light emitted from each LED 13 (step S2: No), the control unit 53 transmits the light that does not become the predetermined luminance. A control signal is sent to the LED drive circuit 51 connected to the LED 13 that emits light, and the width of the pulse current supplied to the LED 13 is adjusted so that light with a predetermined luminance is emitted (step S3). . Thereafter, the control unit 53 ends the process.

  As described above, in the liquid crystal display device 100 according to the first embodiment, even when the luminance of the light emitted from each LED 13 changes due to a temperature change or a change with time, generation of luminance unevenness on the display screen occurs. In addition, the white balance of the light L emitted from the illumination device 10 can be prevented from being lost.

  In the illumination device 10 according to the first embodiment, the pulse current is supplied to the LEDs 13 of each color. However, the present invention is not limited to this, and a constant current may be supplied instead. Needless to say. In this case, based on the magnitude of the current supplied from the light detection circuit 52, the control unit 53 determines that the luminance of each color light emitted from each LED 13 is a predetermined luminance predetermined for each color. Determine whether they are equal. If there is a luminance that does not become the predetermined luminance among the luminances of the light emitted from each LED 13, the control unit 53 applies the LED driving circuit 51 connected to the LED 13 that emits the light that does not become the predetermined luminance. A control signal is sent to adjust the constant current supplied to the LED 13.

(Manufacturing method of liquid crystal display device)
Next, a method for manufacturing the liquid crystal display device 100 according to the first embodiment will be described. FIG. 9 is a flowchart showing a manufacturing method of the liquid crystal display device 100 according to the first embodiment, and FIG. 10 is a flowchart showing a manufacturing method of the element substrate 91 in the liquid crystal display device 100 according to the first embodiment.

  First, the color filter substrate 92 is manufactured (step R11). Specifically, a low-reflection chromium (Cr) film is formed on the surface of the substrate 2 which is a glass substrate by a sputtering method or the like, and a predetermined pattern is formed by using a fine processing method or the like, thereby forming a BM. To do. Then, a coloring material 6 is formed and patterned using a photolithography method to form the colored layer 6. Thereafter, the common electrode 8 is formed by forming an ITO film using a sputtering method or the like.

  Next, the element substrate 91 is manufactured (process R12). A method for manufacturing the element substrate 91 will be described with reference to the flowchart of FIG. Here, FIGS. 11 to 14 are schematic views in the manufacturing process of the element substrate 91. In the schematic diagram of the element substrate 91 shown in FIGS. 11 to 14, it is assumed that a polysilicon TFT 37 is formed as a switching element in the N region and the P region. Specifically, an N-channel TFT is formed in the N region, and a P-channel TFT is formed in the P region. It is assumed that a PIN diode that is the optical sensor 60 is formed in the PIN region.

First, as shown in FIG. 11A, first, a silicon oxide film 64 is formed on the surface of the substrate 1 which is a glass substrate by a plasma CVD (chemical vapor deposition) method or the like to a thickness of 500 to 1000 [nm]. Then, a polysilicon film 62a is further laminated to a thickness of 20 to 100 [nm] (step R21). Thereafter, the polysilicon film 62a is activated by irradiating the polysilicon film 62a with a laser such as an excimer laser. Next, as shown in FIG. 11B, a predetermined pattern is formed on the polysilicon film 62a by using a fine processing method or the like, and then the gate insulating film 65 is formed in a thickness of 50 to 100 by using a plasma CVD method or the like. Lamination is performed with a thickness of [nm] (step R22). Further, after covering the area other than the portion where the N + layer is formed with the photoresist resin, phosphorus ions are implanted into the polysilicon film 62a at a dose of 10 ¹⁵ to 10 ¹⁶ / cm ² by ion doping. (Step R23). As a result, an N + layer 63 is formed in each of the N region, the P region, and the PIN region.

Next, after removing the resist resi, as shown in FIG. 12A, a metal thin film such as aluminum (Al), tantalum (Ta), molybdenum (Mo) or the like is formed using a sputtering method or the like. Then, a predetermined pattern is formed using a fine processing method or the like. Thereby, the gate electrode 33 and the light shielding film 33a are formed (process R24). Next, after covering the area other than the portion where the N− layer is formed with the photoresist resi2, phosphorus ions are applied to the polysilicon film 62a at a dose of 10 ¹³ to 10 ¹⁴ / cm ² using an ion doping method. Injecting (step R25). As a result, an N− layer 63a is formed in the N region. Next, after removing the photoresist resi2, as shown in FIG. 12B, after covering the area other than the portion where the P + layer is formed with the photoresist resi3, boron ions are used by ion doping. Is implanted into the polysilicon film 62a at a dose of 10 ¹⁵ to 10 ¹⁶ / cm ² (step R26). As a result, a P + layer 61 is formed in each of the P region and the PIN region. At this time, the polysilicon film 62 a into which phosphorus ions or boron ions have not been implanted becomes the i layer 62.

  Next, after removing the resist resi3, as shown in FIG. 13A, a first interlayer film 66a is formed by forming a silicon oxide film using a plasma CVD method or the like. Then, a contact hole 67 is formed at a position corresponding to the P + layer 61 and the N + layer 63 of the first interlayer film 66a and the gate insulating film 65 using a fine processing method, a dry etching method, or the like (process R27). Next, as shown in FIG. 13B, after a metal thin film such as aluminum is formed using a sputtering method or the like, a predetermined pattern is formed using a microfabrication method or the like. As a result, the source line 32 is formed in each of the P region and the N region, and the wiring 32a is formed in the PIN region (step R28). At this time, the source line 32 and the wiring 32 a are electrically connected to the P + layer 61 or the N + layer 63 through the contact hole 67.

  Next, as shown in FIG. 14A, a photosensitive organic resin such as acryl is formed in a thickness of 1 to 2 [um] using a spin coating method or the like to form a second interlayer film 66b. Then, the contact hole 67a is formed in the second interlayer film 66b by using a photolithography method or the like (process R29). Thereafter, an ITO film to be a transparent electrode is formed to a thickness of about 100 to 150 [nm] using a sputtering method or the like, and then patterned to form a pixel electrode 34 (step R30). In this way, the element substrate 91 is manufactured, and as shown in FIG. 14B, an N-channel TFT 37a is formed in the N region, and a P-channel TFT 37b is formed in the P region. A PIN diode or photosensor 60 is formed in the PIN region.

  Next, returning to the flowchart of FIG. 9, the color filter substrate 92 and the element substrate 91 are bonded together via the sealing material 5, and liquid crystal is sealed inside the substrates through the openings provided in the sealing material 5. Further, the opening is sealed with a resin material or the like (step R13). In addition, the liquid crystal display device 100 according to the first embodiment is manufactured by attaching necessary elements (step R14).

  As can be seen from the above, in the liquid crystal display device 100 according to the first embodiment, the polysilicon TFT 37 is formed by forming the photosensor 60 on the same surface as the surface on which the polysilicon TFT 37 on the element substrate 91 side is formed. In the process, the PIN diode, that is, the optical sensor 60 can be formed at the same time. Thereby, it is not necessary to provide a new process for forming or installing the optical sensor, and the manufacturing cost can be reduced.

[Second Embodiment]
Next, a second embodiment of the present invention will be described. The liquid crystal display device 100 according to the second embodiment has substantially the same configuration as the liquid crystal display device 100 according to the first embodiment. Also in the liquid crystal display device 100 according to the second embodiment, the plurality of optical sensors 60 are arranged on the element substrate 91 of the liquid crystal display panel 30 in parallel with the arrangement direction of the LEDs 13 in the light source unit 12. In addition, each optical sensor 60 is provided in the vicinity of the light source unit 12 one by one corresponding to the LED 13, and the light emitted from each LED 13 is corresponding to each corresponding optical sensor 60 before being mixed. It is the structure which injects into. However, in the liquid crystal display device 100 according to the second embodiment, in addition to the arrangement of the plurality of photosensors 60, the liquid crystal display according to the first embodiment is further provided with another arrangement of the plurality of photosensors 60. Different from the device 100.

  FIG. 15 is a plan view showing the illumination device 10 and the element substrate 91 in the liquid crystal display device 100 according to the second embodiment.

  As shown in FIG. 15, in the liquid crystal display device 100 according to the second embodiment, the arrangement of the plurality of photosensors 60 in the region A1 in the vicinity of the light source unit 12 described in the liquid crystal display device 100 according to the first embodiment. In addition, it has an arrangement of another plurality of photosensors 60 in the area A2 on the opposite side across the area A1 and the effective display area V. The light emitted from the LEDs 13 enters the light sensors 60 in the region A2 after being mixed into white light.

  FIG. 16 is a block diagram illustrating circuit configurations of the light detection circuit 52 and the illumination device 10 in the liquid crystal display device 100 according to the second embodiment.

  As shown in FIG. 16, the plurality of photosensors 60 in the region A1 are connected in series, and the plurality of photosensors 60 in the region A2 are also connected in series. The light detection circuit 52 includes a potential difference detection circuit 52a. The potential difference detection circuit 52a detects the potential difference Va of the photosensor 60 connected in series in the region A1 and the potential difference Vb of the photosensor 60 connected in series in the region A2. To do. The control unit 53 can determine the magnitude of the luminance in the region A1 and the region A2 by comparing the detected potential difference Va and the potential difference Vb. Specifically, when the potential difference Va is larger than the potential difference Vb, the control unit 53 determines that the brightness of the region A1 is larger than that of the region A2, and when the potential difference Va is smaller than the potential difference Vb, It is determined that the brightness of the area A2 is larger than that of the area A1. Therefore, the control unit 53 can suppress luminance unevenness on the display screen in the light emission direction by adjusting the luminance of each LED 13 based on the comparison result of the detected potential difference Va and potential difference Vb. It becomes.

[Modification]
Next, modified examples of the above embodiments will be described. In each of the above-described embodiments, the light source unit 12 in the lighting device 10 is provided with LEDs of each color of RGB. However, the present invention is not limited to this, and instead, a plurality of color LEDs 13 are packaged. Alternatively, the light source packages 71 may be arranged.

  FIG. 17 is a perspective view showing a configuration of the light source unit 12 according to a modification. As shown in FIG. 17, the light source unit 12 includes a flexible substrate 72 and a plurality of light source packages 71 arranged on the flexible substrate 72. In the light source package 71, a plurality of light sources that respectively emit light of a plurality of colors are packaged in one package. The light source package 71 in which light sources of RGB colors are packaged is also called a so-called 3 in 1 LED package. In the light source unit 12 shown in FIG. 17, LEDs 13R, 13G, and 13B that emit light of each color of RGB are packaged into one light source package 71, respectively. The plurality of light source packages 71 are arranged in parallel so that the light emitted from the LEDs 13R, 13G, and 13B has the same emission direction. The light incident end surface 11c of the light guide plate 11 is disposed opposite to the light emission direction of the light emitted from the LEDs 13R, 13G, and 13B, and the light emitted from the LEDs 13R, 13G, and 13B is incident on the light incident end surface of the light guide plate 11. 11c. As the light emitted from the LEDs 13R, 13G, and 13B diffuses, the light is mixed into the light L that is white light.

  FIG. 18 is an enlarged cross-sectional view of one light source package 71 taken along the cutting line BB ′ in FIG. The light source package 71 mainly includes a reflection frame 73 and LEDs 13 that emit light of each color of RGB. The reflection frame 73 is formed of a resin or the like and has a mortar-shaped recess, and a reflection film that reflects light by plating or the like is formed on the inner surface of the recess. Since the enlarged sectional view of the light source package 71 shown in FIG. 18 is taken along the cutting line BB ′ in FIG. 17, only the red LED 13R is shown, but actually the light of each color of RGB is shown. Each color LED 13 that emits light is installed on the bottom surface of the concave portion of the reflection frame 73. Electrodes 75 and 76 are provided on the bottom surface of the concave portion of the reflection frame 73. One ends of the electrodes 75 and 76 are connected to the outside of the reflection frame 73, specifically, to a drive circuit (not shown) for driving the LED 13 installed on the flexible substrate 72. On the other hand, the other ends of the electrodes 75 and 76 are connected to the LED 13.

  FIG. 19 is a plan view of the illumination device 10 and the element substrate 91 when the above-described light source package 71 is used instead of the LED 13 in the liquid crystal display device 100 according to the first embodiment. In this case, the plurality of optical sensors 60 are arranged on the element substrate 91 of the liquid crystal display panel 30 in parallel with the arrangement direction of the light source packages 71 in the light source unit 12.

  By doing in this way, the control part 53 can pinpoint the place where the brightness | luminance unevenness has generate | occur | produced based on the electric current amount supplied to the photon detection circuit 52 from each photosensor 60. FIG. For example, if the amount of current supplied from the predetermined photosensor 60 is smaller than the amount of current supplied from other photosensors 60, luminance unevenness occurs in the portion where the predetermined photosensor 60 is installed. Will be. This is presumably because the luminance of the light source package 71 located closest to the predetermined optical sensor 60 is small, and the luminance of the light source package 71 in the light emission direction is small. Therefore, at this time, the control unit 53 can suppress luminance unevenness by increasing the luminance of the light source package 71 located closest to the predetermined optical sensor 60.

  Moreover, as LED13 of the light source part 12 in the illuminating device 10, it is not restricted to LED of 3 colors of RGB, You may use LED of 4 colors or more instead. For example, in addition to RGB three-color LEDs, a total of four-color LEDs may be used in which LEDs that emit light of a color complementary to any one of RGB are added. Note that the LED of the fourth color is not limited to any one of the complementary colors of the three colors. It is desirable that the four LEDs have colors corresponding to four colored layers of a color filter of the display panel described later. Furthermore, since green light has high visibility to human eyes, when LEDs 13 of RGB colors are arranged in parallel, one red LED and one blue LED may be arranged for two green LEDs. good.

  The light source unit 12 is installed on one side of the light guide plate 11, but is not limited thereto, and may be installed on two adjacent sides of the light guide plate 11 instead. For example, in the liquid crystal display device 100 according to the second embodiment, when the light source unit 12 is installed on two adjacent sides of the light guide plate 11, the plurality of photosensors 60 have a frame shape outside the effective display region V. Will be arranged.

[Other embodiments]
In the above description, R, G1, B, and G2 have been described as the colors (colored regions) of the colored layer functioning as a color filter. However, the application of the present invention is not limited to this, and other four colors are used. One display pixel can also be constituted by a colored region.

  Specifically, the four colored areas are blue colored areas (also referred to as “first colored areas”) in a visible light area (380 to 780 nm) in which the hue changes according to the wavelength. A colored region having a red hue (also referred to as a “second colored region”) and two colored regions selected from hues from blue to yellow (“third colored region”, “fourth colored region”). Also called “colored region”. Here, the term “system” is used. For example, if it is a blue system, the color is not limited to a pure blue hue, and includes a blue-violet color, a blue-green color, and the like. If it is a red hue, it is not limited to red but includes orange. These colored regions may be composed of a single colored layer, or may be composed of a plurality of colored layers having different hues. In addition, although these colored regions are described in terms of hue, the hue can be set by changing the saturation and lightness as appropriate.

The specific hue range is
-The colored region of the blue hue is from violet to blue-green, more preferably from indigo to blue.
-The colored region of red hue is from orange to red.
-One coloring area | region selected by the hue from blue to yellow is blue to green, More preferably, it is blue green to green.
-The other coloring area | region selected by the hue from blue to yellow is green to orange, More preferably, it is green to yellow. Or it is green to yellowish green.

  Here, the same hue is not used for each colored region. For example, when a green hue is used in two colored regions selected from hues of blue to yellow, the other uses a blue or yellowish green hue for one green.

  Thereby, a wider range of color reproducibility than the conventional RGB colored region can be realized.

In the above, a wide range of color reproducibility by the colored areas of four colors has been described in terms of hue, but as another specific example, it can be expressed as follows with the wavelength of light transmitted through the colored areas.
The blue colored region is a colored region having a wavelength peak of light transmitted through the colored region at 415 to 500 nm, preferably at 435 to 485 nm.
The red colored region is a colored region having a wavelength peak of light transmitted through the colored region of 600 nm or more, and preferably a colored region of 605 nm or more.
-One colored region selected by hue from blue to yellow is a colored region having a wavelength peak of 485-535 nm of light transmitted through the colored region, preferably a colored region having a wavelength of 495-520 nm. .
The other colored region selected with a hue from blue to yellow is a colored region having a wavelength peak of light transmitted through the colored region of 500-590 nm, preferably 510-585 nm, or 530- This is a colored region at 565 nm.

  In the case of transmissive display, this wavelength is a numerical value obtained by illuminating light from the illumination device through the color filter. In the case of reflective display, the value is obtained by reflecting external light.

As another specific example, when a colored region of four colors is expressed by an x, y chromaticity diagram, it is as follows.
The blue colored region is a colored region where x ≦ 0.151 and y ≦ 0.200, preferably a colored region where 0.134 ≦ x ≦ 0.151 and 0.034 ≦ y ≦ 0.200.
The red colored region is a colored region satisfying 0.520 ≦ x and y ≦ 0.360, and preferably a colored region satisfying 0.550 ≦ x ≦ 0.690 and 0.210 ≦ y ≦ 0.360.
-One of the colored areas selected in hues from blue to yellow is a colored area where x ≦ 0.200 and 0.210 ≦ y, preferably a colored area where 0.080 ≦ x ≦ 0.200 and 0.210 ≦ y ≦ 0.759 is there.
-The other colored region selected with a hue from blue to yellow is a colored region in the range of 0.257 ≦ x, 0.450 ≦ y, preferably a colored region in the range of 0.257 ≦ x ≦ 0.520, 0.450 ≦ y ≦ 0.720 is there.

  In the case of transmissive display, the x, y chromaticity diagram is a numerical value obtained by illuminating light from the illumination device through the color filter. In the case of reflective display, the value is obtained by reflecting external light.

  These four colored areas can be applied within the above-described range when the sub-pixel includes a transmission area and a reflection area.

Moreover, the following are preferable as an RGB light source in the illuminating device 10.
・ B is the wavelength peak of emitted light at 435 nm to 485 nm ・ G is the wavelength peak of emitted light at 520 nm to 545 nm ・ R is the wavelength peak of emitted light at 610 nm to 650 nm And if a color filter is appropriately selected according to the wavelength of the RGB light source, a wider range of color reproducibility can be obtained.

Specific examples of the configuration of the above four colored regions include the following.
・ Colored areas of red, blue, green, and blue-green ・ Colored areas of red, blue, green, and yellow ・ Colored areas of red, blue, dark green, and yellow ・ Hue is red and blue Emerald green, yellow colored areas / hues are red, blue, dark green, yellow green colored areas / hues are red, blue green, dark green, yellow green colored areas
[Electronics]
Next, an embodiment in which the liquid crystal display device according to this embodiment is used as a display device of an electronic apparatus will be described.

  As the image signals input to the liquid crystal display device 100 according to the present embodiment, for example, image signals of each color of R, G1, B, and G2 may be directly input from the outside, or each of RGB colors may be input. An image signal may be input from the outside and converted to an image signal of each color of R, G1, B, and G2.

  Here, in the liquid crystal display device 100, a case where image signals of each color of RGB are converted into image signals of each color of R, G1, B, and G2 will be described.

  FIG. 20 is a circuit block diagram of a schematic configuration showing the overall configuration of the present embodiment. An electronic apparatus shown here includes the liquid crystal display device 100 and a control unit 610. The control unit 610 includes a display information output source 611, a display image conversion circuit 612, and a timing generator 614.

  In the liquid crystal display device 100, when the input RGB image signals are converted into R, G1, B, and G2 image signals, the display image conversion circuit 612 outputs an external display image such as a personal computer. The RGB color image signals output from the source 611 are converted into R, G1, B, and G2 color image signals and output to the liquid crystal display panel 30.

  The display image conversion circuit 612 includes an arithmetic processing unit 612a such as a CPU (Central Processing Unit) and a storage unit 612b such as a RAM (Random Access Memory). The arithmetic processing unit 612a converts the RGB image signals 651R, 651G, 651B of the input image output from the display image output source 611 into the R, G1, B, G2 image signals 652R, 652G1, 652B, 652G2. Convert to The storage unit 612b is provided with an LUT (Look Up Table) in which image signals of RGB colors having a predetermined intensity are associated with image signals of colors R, G1, B, and G2 corresponding thereto. ing. For example, when an RGB image signal for displaying the G2 color is input to the arithmetic processing unit 612a, for example, an RGB color image signal having an intensity of R = 0, G = 100, and B = 100, the calculation is performed. The processing unit 612a has R, G1, B, and G2 color image signals having an intensity corresponding to the RGB image signal intensity (for example, R = 0, G1 = 10, B = 10, G2 = 100). Are obtained from the LUT in the storage unit 612b, and the obtained image signals of the respective colors R, G1, B, and G2 are output to the liquid crystal display panel 30. As a result, not only the RGB colors but also the G2 color can be displayed on the display screen of the liquid crystal display panel 30. Thus, even when an RGB image signal is input as the image signal of the input image, the color reproduction range of the output image can be expanded to the G2 color reproduction range.

  The timing generator 614 has a hard switch or a soft switch for switching the timing mode, and generates the clock signal CLK from the luminance signal of the image signal. The driving sequence of the LED driving circuit 51 for each color of RGB described above is controlled so as to match the clock signal CLK determined by the timing generator 614.

  Next, a specific example of an electronic apparatus to which the liquid crystal display device 100 according to this embodiment can be applied will be described with reference to FIG.

  First, an example in which the liquid crystal display device 100 according to the present invention is applied to a display unit of a portable personal computer (so-called notebook personal computer) will be described. FIG. 21A is a perspective view showing the configuration of this personal computer. As shown in the figure, a personal computer 710 includes a main body 712 having a keyboard 711 and a display 713 to which the liquid crystal display device 100 according to the present invention is applied.

  Next, an example in which the liquid crystal display device 100 according to the present invention is applied to a display unit of a mobile phone will be described. FIG. 21B is a perspective view showing the configuration of this mobile phone. As shown in the figure, the cellular phone 720 includes a plurality of operation buttons 721, a reception port 722, a transmission port 723, and a display unit 724 to which the liquid crystal display device 100 according to the present invention is applied.

  Electronic devices to which the liquid crystal display device 100 according to the present invention can be applied include a liquid crystal television and a viewfinder in addition to the personal computer shown in FIG. 21A and the mobile phone shown in FIG. Type / monitor direct-view type video tape recorder, car navigation device, pager, electronic notebook, calculator, word processor, workstation, videophone, POS terminal, digital still camera, etc.

1 is a plan view of a liquid crystal display device according to a first embodiment. 1 is a cross-sectional view of a liquid crystal display device according to a first embodiment. It is an expanded sectional view of an optical sensor. It is a block diagram which shows the structure of the illuminating device which concerns on 1st Embodiment. It is a circuit diagram of the LED drive circuit which concerns on 1st Embodiment. The timing chart which showed the drive sequence of LED of each color in an illuminating device. It is a top view of the illuminating device and element substrate which concern on 1st Embodiment. The flowchart about LED current control processing. 3 is a flowchart showing a method for manufacturing the liquid crystal display device according to the first embodiment. Flow chart showing a method for manufacturing an element substrate The schematic diagram in the manufacturing process of an element substrate is shown. The schematic diagram in the manufacturing process of an element substrate is shown. The schematic diagram in the manufacturing process of an element substrate is shown. The schematic diagram in the manufacturing process of an element substrate is shown. It is a top view of the illuminating device and element substrate which concern on 2nd Embodiment. It is a block diagram which shows the structure of the photon detection circuit and illuminating device which concern on 2nd Embodiment. It is a perspective view which shows the structure of the light source part 12 which concerns on a modification. It is an expanded sectional view of a light source package. It is a top view of the illuminating device and element substrate which concern on a modification. 1 is a circuit block diagram of an electronic apparatus to which a liquid crystal display device according to an embodiment is applied. It is a figure which shows the example of the electronic device to which the liquid crystal display device of this embodiment is applied.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 12 Light source part, 13 LED, 14 Diffusion sheet, 15 Prism sheet, 10 Illumination device, 60 Optical sensor, 30 Liquid crystal display panel, 100 Liquid crystal display device

Claims (11)

A display panel having a pair of substrates and an electro-optical material sandwiched between the pair of substrates, and provided with a plurality of sub-pixels;
An illumination device that has a plurality of light sources and illuminates the display panel by transmitting light emitted from the plurality of light sources;
A plurality of semiconductor elements that are arranged on the display panel in parallel with the arrangement direction of the plurality of light sources, and generate current when light emitted from the plurality of light sources is incident;
An electro-optical device comprising: light source control means for controlling the luminance of each of the plurality of light sources based on the magnitude of the current.   The semiconductor element is formed on one of the pair of substrates and on the same surface as a surface on which a switching element for driving the subpixel is formed. The electro-optical device according to claim 1.   The electro-optical device according to claim 2, wherein a light-shielding film that shields light is formed on an inner surface of the semiconductor element.   The electro-optical device according to claim 2, wherein the semiconductor element is a PIN diode, and the switching element is a polysilicon TFT.   The electro-optical device according to claim 1, wherein the semiconductor element is formed outside an effective display area of the display panel. The plurality of semiconductor elements are incident after the light emitted from the plurality of light sources is mixed and the light emitted from the plurality of light sources is mixed. A plurality of second semiconductor elements,
The light source control means further includes a potential difference obtained when the plurality of first semiconductors are connected in series and a potential difference obtained when the plurality of second semiconductors are connected in series. The electro-optical device according to claim 1, wherein brightness is controlled. The plurality of light sources are a plurality of light sources arranged to emit light of each color of RGB,
The plurality of semiconductor elements are provided one by one corresponding to each of the plurality of light sources,
6. The electro-optical device according to claim 1, wherein light emitted from the plurality of light sources is incident on the plurality of semiconductor elements before being mixed.   7. The light source package according to claim 1, wherein the plurality of light sources are a plurality of light source packages in which light emitters each emitting light of a plurality of colors are packaged into one. The electro-optical device according to Item.   The display panel is disposed on the other of the pair of substrates corresponding to the plurality of sub-pixels, and includes a red first colored layer, a blue second colored layer, and a hue from blue to yellow. The electro-optic according to claim 1, wherein the electro-optic has four colored regions composed of colored layers of two kinds of third and fourth colors arbitrarily selected from the above. apparatus.   The display panel is disposed on the other substrate of the pair of substrates corresponding to the plurality of sub-pixels, and the first colored region having a wavelength peak of light transmitted through the colored region of 415 to 500 nm; 2. A colored region of four colors comprising a second colored region at 600 nm or more, a third colored region at 485-535 nm, and a fourth colored region at 500-590 nm. The electro-optical device according to claim 1.   An electronic apparatus comprising the electro-optical device according to claim 1 in a display unit.

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