KR102113631B1 - Liquid crystal display device and method for fabricating the same - Google Patents

Abstract

The present invention relates to a liquid crystal display device capable of implementing a narrow bezel, and the disclosed invention includes a liquid crystal panel in which an image is implemented; A light source unit for supplying light to the liquid crystal panel; A light guide plate having a plurality of protrusion patterns formed on an upper surface, and positioned on the side of the light source unit to convert light incident from the light source into planar light and proceed toward the liquid crystal panel; An optical sheet bonded and integrated on the projection pattern of the light guide plate; A reflective sheet disposed on a lower surface of the light guide plate; It comprises an integrated light guide plate and a lower cover in which the optical sheet and the reflective sheet are accommodated.

Description

Liquid crystal display device and its manufacturing method {LIQUID CRYSTAL DISPLAY DEVICE AND METHOD FOR FABRICATING THE SAME}

The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device integrated with a light guide plate and an optical sheet and a manufacturing method thereof.

In general, a liquid crystal display (LCD) is a device that displays a desired image by adjusting light transmittance of liquid crystal cells arranged in a matrix according to image signal information. An image is formed on the panel.

The liquid crystal display device using this principle has a tendency to gradually expand its application range due to characteristics such as light weight, thinness, and low power consumption. According to this trend, liquid crystal display devices are used in office automation devices, audio / video devices, and the like. In the liquid crystal display, the amount of light transmitted is adjusted according to signals applied to a plurality of control switches arranged in a matrix form to display a desired image on a screen.

Recently, liquid crystal displays have been widely applied to computer monitors and televisions, as well as display devices for vehicle navigator systems, and portable display devices such as laptops and cell phones.

Since most of the liquid crystal display devices as described above are non-emissive type display elements that display an image by adjusting the amount of a light source coming from the outside, a backlight including a separate light source for irradiating light to the liquid crystal display panel Unit is required.

A conventional liquid crystal display device having such a backlight unit will be described with reference to FIGS. 1 to 2 as follows.

1 is a schematic plan view of a liquid crystal display according to the prior art, and is a plan view schematically showing a light emitting area and a bezel area.

FIG. 2 is a cross-sectional view taken along line II-II of FIG. 1 and is a schematic cross-sectional view of a liquid crystal display device according to the prior art.

Referring to FIG. 1, the liquid crystal display 1 according to the prior art includes a bezel area defined in a light emitting area P in which an image is implemented and an outer area of the light emitting area P and having a first width W1 ( B).

 Referring to FIG. 2, the liquid crystal display device 1 according to the prior art generates from a liquid crystal panel 10 in which an image is implemented, a light source unit (not shown) for supplying light to the liquid crystal panel 10, and the light source unit. A light guide plate 30 for providing light to the front of the liquid crystal panel 10, a guide panel 40 surrounding and supporting the liquid crystal panel 10 and a light source unit (not shown), and the guide panel 40 And a lower cover 70 in which the light source unit (not shown) and the light guide plate 30 are accommodated.

The liquid crystal panel 10 is composed of a color filter array substrate 10a and a TFT array substrate 10b and a liquid crystal layer (not shown) interposed therebetween, and the color filter array substrate 10a and a TFT array substrate ( The upper and lower polarizing plates 15a and 15b are respectively attached to the outer surfaces of 10b).

In the liquid crystal panel 10, liquid crystal cells constituting a pixel unit are arranged in a matrix form, and liquid crystal cells form an image by adjusting light transmittance according to image signal information transmitted from a driver driving circuit (not shown).

A plurality of optical sheets 20 for scattering light emitted from the light guide plate 30 is disposed on the front surface of the light guide plate 30, and the efficiency of light is reflected on the rear surface of the light guide plate 30 by reflecting light emitted rearward. Reflective sheet 60 is disposed to improve the.

The plurality of optical sheets 20 is for diffusing and condensing light incident from the light guide plate 30, as shown in FIG. 2, the diffusion sheet 21 and the prism sheet 23 and the protective sheet 25 ).

Although not shown in the drawing, the light source unit (not shown) includes a plurality of LED light sources (not shown) and a substrate (not shown) on which the LED light sources (not shown) are mounted.

The light guide plate 30 is positioned on one side of the light source unit (not shown) and is disposed on the rear surface of the liquid crystal panel 10 to inwardly generate light generated from the light source unit (not shown) through the light incident surface 30a. It is delivered to be guided to the rear surface of the liquid crystal panel 10.

Meanwhile, a first double-sided tape 81 is attached to the upper surface of the guide panel 40 to bond the liquid crystal panel 10 so that the liquid crystal panel 10 is coupled to the guide panel 40 to prevent flow. , Light leakage is prevented by the double-sided tape 81.

In addition, the second double-sided tape 83 is also attached to the lower surface of the guide panel 40 so that the reflective sheet 60 is adhered to the guide panel 40, thereby preventing the flow of the reflective sheet 60.

The reflective sheet 60 is provided at the lower portion of the light guide plate 30, reflects some light emitted to the lower portion of the light guide plate 30 to the light exit surface 30b of the light guide plate 30 to increase light efficiency, and incident light By adjusting the total amount of reflection, the entire light exit surface 30b has a uniform luminance distribution.

In addition, the lower cover 70 has a rectangular box shape with an open top, and components including a light guide plate 30 and an optical sheet 20 and a reflective sheet 60 wrapped by the guide panel 40 are accommodated. Thus, the liquid crystal display device 1 is formed.

However, in the liquid crystal display device according to the prior art, a guide panel and a double-sided tape are used to fix the light guide plate to the reflector and the optical sheet, respectively. ) There is a limit to minimizing.

Therefore, in the liquid crystal display device according to the prior art, it is necessary to minimize the first width W1 of the bezel area B of the outer region of the liquid crystal display device because a guide panel is absolutely necessary to fix the reflector, the light guide plate, and the optical sheet. it's difficult. In particular, in the backlight unit according to the prior art, in the absence of a guide panel, the phenomenon that the optical sheet and the light guide plate are separated occurs, so that the liquid crystal panel disposed on the top sheet is detached from the backlight unit, so that the optical sheet In order to ensure that the diffusion sheet constituting the prism sheet and the protective sheet are fixed without being detached, a guide panel is necessary.

Accordingly, the present invention is to solve the above problems, and the object of the present invention is that the optical panel is bonded to the light guide plate without a guide panel to be integrated so that the guide panel can be omitted, so that a narrow bezel product can be realized. It provides an apparatus and a manufacturing method thereof.

A liquid crystal display device according to the present invention for achieving the above object, a liquid crystal panel in which an image is implemented; A light source unit for supplying light to the liquid crystal panel; A light guide plate having a plurality of protrusion patterns formed on an upper surface, and positioned on the side of the light source unit to convert light incident from the light source into planar light and proceed toward the liquid crystal panel; An optical sheet bonded and integrated on the projection pattern of the light guide plate; A reflective sheet disposed on a lower surface of the light guide plate; It is characterized in that it comprises an integrated light guide plate and an optical sheet and a lower cover for receiving the reflective sheet.

A method of manufacturing a liquid crystal display device according to the present invention for achieving the above object includes providing a liquid crystal panel in which an image is implemented; Providing a light source unit for supplying light to the lower portion of the liquid crystal panel; Placing a light guide plate on the side of the light source unit to convert light incident from the light source unit into planar light and proceed to the liquid crystal panel; Forming a plurality of projection patterns on the upper surface of the light guide plate; Bonding the optical sheet onto the projection pattern of the light guide plate and integrating it with the light guide plate; Placing a reflective sheet on the lower surface of the light guide plate; And storing the integrated light guide plate and the optical sheet and the reflective sheet inside the lower cover. And arranging the liquid crystal panel on the optical sheet.

The liquid crystal display device and the manufacturing method according to the present invention can be omitted by guiding the optical panel on the upper surface of the light guide plate and integrating these light guide plates and the optical sheet, thereby minimizing the width of the bezel region where no light is emitted.

In addition, the liquid crystal display device according to the present invention and a method of manufacturing the same can form a plurality of projection patterns on the upper surface of the light guide plate to control the bonding role with the optical sheet and the brightness uniformity of the entire screen.

In addition, the liquid crystal display device according to the present invention and a method of manufacturing the optical sheet are bonded to the upper surface of the light guide plate, thereby integrating these light guide plates and the optical sheet to improve the condensing and diffusion functions of the existing optical sheet, and to improve image quality. The uniformity optimization function will also be implemented.

1 is a schematic plan view of a liquid crystal display according to the prior art, and is a plan view schematically showing a light emitting area and a bezel area.
2 is a cross-sectional view taken along line II-II of FIG. 1, and is a schematic cross-sectional view of a liquid crystal display device according to the prior art.
3 is a schematic plan view of a liquid crystal display according to the present invention, and is a plan view schematically showing a light emitting area and a bezel area.
4 is an exploded perspective view of a liquid crystal display device according to the present invention.
5 is a cross-sectional view taken along line V-V of FIG. 3, and is a schematic cross-sectional view of the liquid crystal display device according to the present invention.
6 is a cross-sectional view schematically showing a path of light traveling inside the light guide plate of the liquid crystal display according to the present invention.
7A to 7G are cross-sectional views schematically showing a manufacturing process of a liquid crystal display device according to the present invention.

Hereinafter, a liquid crystal display device according to an exemplary embodiment will be described in detail with reference to the accompanying drawings.

3 is a schematic plan view of a liquid crystal display according to the present invention, and is a plan view schematically showing a light emitting area and a bezel area.

Referring to FIG. 3, the liquid crystal display device 100 according to an exemplary embodiment of the present invention is defined in a light emitting area P and an outer area of the light emitting area P, and has a bezel area having a second width W2. (B). At this time, the bezel region B has a second width W2, and has a very narrow width compared to the first width W1 of the existing bezel region B shown in FIG. 1.

4 is an exploded perspective view of a liquid crystal display device according to the present invention.

5 is a cross-sectional view taken along line V-V of FIG. 3, and is a schematic cross-sectional view of the liquid crystal display device according to the present invention.

4 and 5, the liquid crystal display device 100 according to the present invention includes a liquid crystal panel 110 in which an image is implemented; A light source unit 150 that supplies light to the liquid crystal panel 110; A plurality of protrusion patterns 135a are formed on an upper surface, and positioned on the side of the light source unit 150, converts light incident from the light source unit 150 into planar light and propagates toward the liquid crystal panel 110. )and; An optical sheet 120 bonded to the projection pattern 135a of the light guide plate 130 and integrated with the light guide plate; A reflective sheet 160 disposed on a lower surface of the light guide plate 130; The integrated optical sheet 120 and the light guide plate 130 and the reflective sheet 160 are configured to include a lower cover 170 is accommodated.

Here, the liquid crystal panel 110 includes a color filter array substrate 110a, a TFT array substrate 110b, and a liquid crystal layer (not shown) interposed therebetween.

Referring to FIG. 5, the liquid crystal panel 110 is attached to the front surface of the color filter array substrate 110a and the back surface of the TFT array substrate 110b so that light passing through the liquid crystal panel 110 is cross-polarized. It further includes a front polarizing plate 115a and a rear polarizing plate 115b.

In the liquid crystal panel 110, liquid crystal cells constituting a pixel unit are arranged in a matrix form, and liquid crystal cells form an image by adjusting light transmittance according to image signal information transmitted from the driver driving circuit 113.

Although not illustrated in the drawings, the TFT array substrate 110b has a plurality of gate lines and a plurality of data lines formed in a matrix, and a thin film transistor (TFT) is formed at the intersection of the gate line and the data line. Is formed.

The signal voltage transmitted from the driver driving circuit 113 is applied between the pixel electrode and the common electrode (not shown) of the color filter array substrate 110a to be described later through the thin film transistor, and the liquid crystal between the pixel electrode and the common electrode is It is arranged according to the signal voltage to determine the light transmittance.

On the other hand, although not shown in the drawing, the color filter array substrate 110a includes a color filter and a common electrode formed by repeating red, green and blue or cyan, magenta, and yellow borders around a black matrix. The common electrode is made of a transparent conductive material such as ITO (Indium Tin Oxide) or IZO (Indium Zinc Oxide).

Referring to FIG. 4, one side of the liquid crystal panel 110 includes a driving driver 113 for driving a unit pixel formed on the liquid crystal panel, and a flexible printed circuit board having one end connected to the liquid crystal panel. ; FPCB, 117) are connected.

The backlight unit (not shown) includes a light source unit 150 for generating light and a light guide plate 130 for providing light generated from the light source unit 150 to the front surface of the liquid crystal panel 110 through an incident surface 130a. , And a reflective sheet 160 that is attached to the rear surface of the light guide plate 130 to reflect the light emitted from the rear to improve the efficiency of light, and is stacked on the front surface of the light guide plate 130 and emitted from the light guide plate 130 It includes an optical sheet 120 to scatter.

Here, the light source unit 150 is a cold cathode fluorescent lamp (Cothode Fluorescent Lamp: CCFL), an external electrode fluorescent lamp (External Electrode Fluorescent Lamp: EEFL), one of the light emitting diodes (Light Emitting Diode: LED) is used, here The case where a light emitting diode element (LED element) is applied is exemplified.

In addition, the light source unit 150 includes an LED light source 151 and an LED substrate 153 on which the LED light source 151 is mounted.

The LED light source 151 is a side viewing type device, and the LED light source 151 emits light toward an incident surface 130a of the light guide plate 130. The LED substrate 153 is a flexible printed circuit board having excellent bending, and a circuit (not shown) is formed therein to supply external power to the LED light source 151 through the circuit.

The optical sheet 120 is for diffusing and condensing light from the light exit surface 130b of the light guide plate 130, as shown in FIG. 4, the diffusion sheet 121 and the prism sheet 123 integrated with each other ) And a protective sheet 125. In some cases, two diffusion sheets and two prism sheets may be provided. At this time, the diffusion sheet 121 is composed of a base plate and a bead-shaped coating layer formed on the base plate.

The diffusion sheet 121 serves to diffuse light generated from the light source unit 150 and supply it to the liquid crystal panel 110, and two or three sheets may be overlapped.

In addition, the prism sheet 123 is formed in a triangular prism-shaped prism on the upper surface, and the prism sheet 123 displays the light diffused from the diffusion sheet 121 on the upper liquid crystal panel 110. It serves to condense light in a direction perpendicular to the plane of. Two pieces of the prism sheet 123 are usually used, and the micro prisms formed on each prism sheet 123 form a predetermined angle.

Therefore, light passing through the prism sheet 123 is mostly vertically provided to provide a uniform luminance distribution. The protection sheet 125 located at the top serves to protect the prism sheet 123 that is weak from scratches.

On the other hand, referring to Figure 4, the light guide plate 130 is the light entering the light incident from the LED light source 151 (130a), and extending from the light incident surface (130a) facing the liquid crystal panel (110) It is composed of a light surface 130b, and a plurality of protrusion patterns 135a are formed on the light exit surface 130b of the light guide plate 13. At this time, the protrusion pattern 135a may be formed using UV resin or other types of resin.

6 is a cross-sectional view schematically showing a path of light traveling inside the light guide plate of the liquid crystal display according to the present invention.

Referring to FIG. 6, the plurality of protrusion patterns 135a are positioned between the light guide plate 130 and the optical sheet 120 on the upper side thereof, and the light guide plate 130 and the optical sheet 120 are joined together. , By acting as a passage through which the light 180 can travel between the light guide plate 130 and the optical sheet 120, it serves to allow light to be emitted. At this time, the plurality of protrusion patterns 135a may control the uniformity of the entire backlight by adjusting the size and density. In addition, although not shown in the drawing, the protrusion pattern 135a may be formed to have a low density in the light incident region near the LED light source 150 and a high density toward the incoming light region. At this time, the shape of the protrusion pattern 135a may be applied in various shapes such as a cylinder, a cone, a polygonal pillar, and a polygonal horn.

Accordingly, the light guide plate 130 is positioned on one side of the LED light source 151 and is disposed on the rear surface of the liquid crystal panel 110 to control the light 180 generated from the LED light source 151. 110). The light guide plate 130 changes the light 180 irradiated from the LED light source 151 disposed adjacent to the light incident surface 130a to the light incident surface 130a along one side of the light guide plate 130 to flat light. It is uniformly transmitted to the liquid crystal panel 110 through the light surface 130b. As a material of the light guide plate 130, PMMA (Polymethy- methacry- late), which has high strength and is not easily deformed or broken and has good transmittance, may be used.

Here, the light guide plate 130 may be provided in a plate shape in which the lower surface is inclined and the upper surface is flat, or both the lower surface and the upper surface are parallel. In the case of a liquid crystal display device applied to a small product such as a notebook PC or a mobile phone, a wedge-shaped light guide plate 130 may be applied, and a light source unit 150 may be provided on a side wall of a thick side.

The reflective sheet 160 reflects some light emitted to the lower portion of the light guide plate 130 to the light exit surface 130b of the light guide plate 130 to increase light efficiency, and adjust the reflection amount of the entire incident light to control the light output surface 130b. ) Make the whole have a uniform luminance distribution. At this time, the reflective sheet 160 has a regular reflection characteristic that is emitted at an angle at which light is incident.

On the other hand, the lower cover 170 is a rectangular box shape with an open top, components of a backlight unit (not shown) including the integrated light guide plate 130 and the optical sheet 120 and the reflective sheet 160 are stored. do.

The liquid crystal panel 110 is disposed and combined on the lower cover 170 in which the reflective sheet 160, the light guide plate 130, and the optical sheet 120 are accommodated, thereby providing the liquid crystal display device 100 according to the present invention. Will be achieved.

In this way, the liquid crystal display device according to the present invention can minimize the width of the bezel region in which light is not emitted because the guide panel can be omitted by bonding the optical sheet to the upper surface of the light guide plate and integrating these light guide plates and the optical sheet.

In addition, the liquid crystal display device according to the present invention can form a plurality of projection patterns on the upper surface of the light guide plate, thereby controlling the bonding role with the optical sheet and the brightness uniformity of the entire screen.

In addition, in the liquid crystal display device according to the present invention, by converging optical sheets on the upper surface of the light guide plate and integrating these light guide plates and the optical sheet, the condensing and diffusion functions of the existing optical sheet are improved, and the luminance uniformity optimization function for securing image quality is also improved. Will be implemented.

A method for manufacturing a liquid crystal display device according to the present invention having the above configuration will be described with reference to FIGS. 7A to 7G.

7A to 7G are cross-sectional views schematically showing a method of manufacturing a liquid crystal display device according to the present invention.

Referring to FIG. 7A, a light guide plate composed of an incident surface 130a through which light is incident from an LED light source (not shown) and an exit surface 130b extending from the incident surface 130a and facing a liquid crystal panel (not shown) Prepare (130).

At this time, the light guide plate 130 is positioned on one side of the LED light source (not shown) and is disposed on the rear surface of the liquid crystal panel 110 to convert the light generated from the LED light source to the rear surface of the liquid crystal panel 110. Induces. The light guide plate 130 changes the light irradiated to the light incident surface 130a from the LED light source disposed adjacent to the light incident surface 130a along one side of the light guide plate 130 to plane light, and through the light exit surface 130b It is uniformly delivered to the liquid crystal panel 110. As the material of the light guide plate 130, PMMA (Polymethy- methacry- late), which has high strength and is not easily deformed or broken and has good transmittance, may be used.

Here, the light guide plate 130 may be provided in a plate shape in which the lower surface is inclined and the upper surface is flat, or both the lower surface and the upper surface are parallel. In the case of a liquid crystal display device applied to a small product such as a notebook PC or a mobile phone, a wedge-shaped light guide plate 130 may be applied, and a light source unit 150 may be provided on a side wall of a thick side.

Then, the UV resin layer 135 is applied on the light exiting surface 130b of the light guide plate 130 by a predetermined thickness. In this case, as the UV resin layer 135, a UV resin or other material resin may be used.

Subsequently, referring to FIGS. 7B and 7C, a plurality of protrusion patterns 135a are formed on the upper surface of the light guide plate 130 while rotating the soft mold 180 on the UV resin layer 135. At this time, the soft mold 180 is designed to determine the uniformity of the light guide plate by adjusting the density and size of the projection pattern.

The plurality of protrusion patterns 135a are positioned between the light guide plate 130 and an optical sheet thereon (not shown; see 120 in FIG. 7F), and serves to bond the light guide plate 130 and the optical sheet 120. Together, the light guide plate 130 and the optical sheet 120 serve as a passage through which light can travel, thereby acting to allow light to be emitted. The plurality of protrusion patterns 135a may control the uniformity of the entire backlight by adjusting size and density.

In addition, although the projection patterns 135a are not illustrated in the drawing, the density may be formed low in the light incident region near the LED light source 150, and the density may increase as the light enters the region. At this time, the shape of the protrusion pattern 135a may be applied in various shapes such as a cylinder, a cone, a polygonal pillar, and a polygonal horn.

Next, referring to FIG. 7D, a plurality of protrusion patterns 135a on the light guide plate 130 are irradiated with ultraviolet rays (UV) to undergo primary curing, that is, semi-curing treatment. At this time, the primary curing treatment conditions are adjusted within a range of about 1 to 500 mJ, such that the UV resin does not lose bonding properties.

Subsequently, referring to FIG. 7E, a lamination sheet 120a wound on a roll 190 is rolled onto the plurality of protrusion patterns 135a to bond the optical sheet on the plurality of semi-cured protrusion patterns 135a. Paste to form the optical sheet 120. At this time, the lamination sheet 120a is integrated with a diffusion sheet, a prism sheet, and a protection city. The plurality of optical sheets 120 are for diffusing and condensing light from the light exit surface 130b of the light guide plate 130, and are integrated into a diffusion sheet 121, a prism sheet 123, and a protection sheet 125. It is. In some cases, two diffusion sheets and two prism sheets may be provided. At this time, the diffusion sheet 121 is composed of a base plate and a bead-shaped coating layer formed on the base plate, and serves to diffuse light from the light source unit 150 and supply it to the liquid crystal panel 110. The diffusion sheet 121 may be used by stacking two or three sheets.

In addition, the prism sheet 123 is formed with a triangular prism-shaped prism on the upper surface, and the prism sheet 123 displays the light diffused from the diffusion sheet 121 on the upper liquid crystal panel 110. It serves to condense light in a direction perpendicular to the plane of. In addition, two pieces of the prism sheet 123 are usually used, and the micro prisms formed on each prism sheet 123 form a predetermined angle, so that the light passing through the prism sheet 123 proceeds vertically and uniform brightness. Distribution.

Moreover, the protective sheet 125 located at the top serves to protect the prism sheet 123 that is weak from scratches.

 Next, referring to FIG. 7f, the optical sheet 120 is completely cured by second curing by irradiating ultraviolet (UV) light while the optical sheet 120 is attached to the protrusion pattern 135a. (135a). At this time, the pressure of the roll 190 of the optical sheet 135a at the time of bonding is optimized to prevent the projection pattern 135a from collapsing.

By fixing the optical sheet 135a and the light guide plate 130 through the complete curing process, the light guide plate 130 and the optical sheet 135a can be integrated.

Subsequently, referring to FIG. 7G, the reflective sheet 160 is bonded to the rear surface of the light guide plate 130 through a transparent adhesive layer (not shown) made of a transparent adhesive material such as OCR, OCA, or resin. At this time, the reflective sheet 160 reflects some light emitted from the lower portion of the light guide plate 130 to the light exit surface 130b of the light guide plate 130 to increase light efficiency, and adjust the reflection amount of the entire incident light to control the light output surface. (130b) Let the whole have a uniform luminance distribution. At this time, the reflective sheet 160 has a regular reflection characteristic that is emitted at an angle at which light is incident.

Then, a lower cover 170 with an open top is prepared to accommodate the light guide plate 130 and the optical sheet 120 integrated with the reflective sheet 160 inside the lower cover 170.

Subsequently, an assembly process of the liquid crystal display device 100 according to the present invention is completed by mounting and bonding the liquid crystal panel 110 on the optical sheet 120.

At this time, the liquid crystal panel 110 includes a color filter array substrate 110a, a TFT array substrate 110b, and a liquid crystal layer (not shown) interposed therebetween. In addition, although not shown in the drawings, the liquid crystal panel 110 is attached to the front surface of the color filter array substrate 110a and the rear surface of the TFT array substrate 110b, respectively, so that light passing through the liquid crystal panel 110 is cross-polarized. The front polarizer 115a and the rear polarizer 115b are further included.

In the liquid crystal panel 110, liquid crystal cells constituting a pixel unit are arranged in a matrix form, and liquid crystal cells form an image by adjusting light transmittance according to image signal information transmitted from a driver driving circuit (not shown).

As described above, in the method of manufacturing a liquid crystal display device according to the present invention, the guide panel can be omitted by bonding the optical sheet to the upper surface of the light guide plate and integrating these light guide plates and the optical sheet, thereby minimizing the width of the bezel region where no light is emitted. .

In addition, in the method of manufacturing a liquid crystal display device according to the present invention, by forming a plurality of projection patterns on the upper surface of the light guide plate, it is possible to control the bonding role with the optical sheet and the brightness uniformity of the entire screen.

In addition, in the method of manufacturing a liquid crystal display device according to the present invention, the optical sheet is bonded to the upper surface of the light guide plate to integrate these light guide plates and the optical sheet, thereby improving the light collecting and diffusion functions of the existing optical sheet, and optimizing the luminance uniformity to secure image quality. The function will also be implemented.

Although the embodiments of the present invention have been described with reference to the accompanying drawings, those skilled in the art to which the present invention pertains may be implemented in other specific forms without changing the technical spirit or essential features of the present invention. You will understand.

Therefore, the above-described embodiments are provided to fully inform the person of ordinary skill in the art to which the present invention pertains, the scope of the invention, and should be understood as illustrative in all respects and not restrictive. The invention is only defined by the scope of the claims.

100: liquid crystal display 110: liquid crystal panel
110a: color filter array substrate 110b: TFT array substrate
113: driving driver 115: printed circuit board
120: optical sheet 121: diffusion sheet
123: Prism sheet 125: Protective sheet
130: light guide plate 135a: projection pattern
150: light source unit 151: LED element 153: LED substrate 160: reflective sheet 170: lower cover

Claims (15)

A liquid crystal panel in which an image is implemented;
A light source unit for supplying light to the liquid crystal panel;
A light guide plate having a plurality of protrusion patterns formed in a dot shape on an upper surface, and positioned at a side of the light source unit to convert light incident from the light source into planar light to advance toward the liquid crystal panel;
An optical sheet bonded and integrated on the projection pattern of the light guide plate;
A reflective sheet disposed on a lower surface of the light guide plate through a transparent adhesive layer; And
The integrated light guide plate and the optical sheet, and a lower cover for receiving the reflective sheet; is configured to include,
The projection pattern is formed of a different material from the light guide plate and serves as a passage for light to travel between the light guide plate and the optical sheet, and the liquid crystal display device characterized in that the density of the pattern increases as it moves away from the light source. The liquid crystal display device according to claim 1, wherein the projection pattern is made of UV resin. The liquid crystal display device according to claim 1, wherein the projection pattern is any one of a shape including a cone, a cylinder, a polygon, and a polygon. The liquid crystal display device according to claim 1, wherein the optical sheet is composed of a diffusion sheet, a prism sheet, and a laminated sheet in which a protective sheet is integrated. delete delete Providing a liquid crystal panel in which an image is implemented;
Providing a light source unit for supplying light to the lower portion of the liquid crystal panel;
Placing a light guide plate on the side of the light source unit to convert light incident from the light source unit to planar light and proceed to the liquid crystal panel;
Forming a plurality of projection patterns in a dot form using different materials from the light guide plate on the upper surface of the light guide plate;
Bonding the optical sheet onto the projection pattern of the light guide plate and integrating it with the light guide plate;
Disposing a reflective sheet through a transparent adhesive layer on the lower surface of the light guide plate; And
Receiving the integrated light guide plate and the optical sheet and the reflective sheet inside the lower cover; And
And disposing the liquid crystal panel on the optical sheet,
The projection pattern serves as a passageway so that light can travel between the light guide plate and the optical sheet, and as the distance from the light source increases, the density of the pattern increases to form a liquid crystal display device. The method of claim 7, wherein the protrusion pattern is made of UV resin. The method of claim 7, wherein the projection pattern is any one of a shape including a cone, a cylinder, a polygon, and a polygon. The method of claim 7, wherein the projection pattern is formed by a printing method using a soft mold. The method of claim 7, wherein in the step before forming the optical sheet, a process of first semi-curing the projection pattern is added. The method of claim 11, wherein the step of forming the optical sheet,
Attaching an optical sheet wound on a roll onto the projection pattern of the light guide plate after the first semi-curing treatment,
A method of manufacturing a liquid crystal display device comprising the step of integrating an optical sheet on a projection pattern of the light guide plate by completely curing the optical sheet by secondary curing treatment. The method of claim 7, wherein the optical sheet is composed of a diffusion sheet, a prism sheet, and a laminated sheet in which a protective sheet is integrated. delete 12. The method of claim 11, wherein the first semi-curing treatment condition is performed within a range of 1 to 500 mJ.

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