KR102120807B1 - Liquid crystal display device moudle - Google Patents

Abstract

The present invention discloses a liquid crystal display device. More specifically, the present invention relates to a liquid crystal display module having a structure capable of stably fixing components to each other while simplifying an assembly process between an optical member and a mechanism structure included in a backlight unit and reducing the number of parts. .
According to the structure of the present invention, by forming a cutting portion on one side of the light guide plate of the backlight unit, and forming a protrusion having an inclined surface on the guide panel of the mechanism structure, the light guide plate flows by pushing the light guide plate vertically as it is inserted into the cutting portion. It has the effect of minimizing and simplifying the assembly process of the liquid crystal display device module.

Description

Liquid crystal display module {LIQUID CRYSTAL DISPLAY DEVICE MOUDLE}

The present invention relates to a liquid crystal display device, in particular, to simplify the assembly process between the optical member and the mechanism structure included in the backlight unit, while reducing the number of components, the liquid crystal display module having a structure capable of stably fixing the components to each other It is about.

A flat panel display (FPD) replaces a conventional cathode ray tube (CRT) display device to reduce the size and weight of not only a desktop computer monitor, but also a portable computer such as a notebook computer, PDA, or a mobile phone terminal. It is an essential display device for realizing the system. Currently commercially available flat panel displays include liquid crystal displays (LCDs), plasma display panels (PDPs), and organic light emitting diodes (OLEDs). The device is in the spotlight as a display device used in mobile devices, computer monitors and HDTVs according to advantages such as excellent visibility, easy thinning, low power and low heat generation.

Since such a liquid crystal display device is a non-emissive device, a backlight unit including a light source for providing light to the liquid crystal panel must be provided, and the backlight unit increases the efficiency of light emitted from the light source. , A light guide plate and a plurality of optical members such as an optical sheet.

Light sources that emit light from these backlight units include cold cathode fluorescent lamps (CCFLs), external electrode fluorescent lamps (EEFLs), and light emitting diodes (LEDs). Recently, LEDs having long life, high luminance, and low power consumption have been widely used, and LEDs advantageous for thinning are widely used.

In addition, the backlight unit is modularized in combination with a liquid crystal panel and a mechanical structure such as a guide panel and a bottom cover for maintaining rigidity from external forces and supporting the rear surface.

1 is an exploded perspective view schematically showing a part of a backlight unit of a conventional liquid crystal display module and components coupled thereto.

Referring to FIG. 1, the backlight unit of the conventional liquid crystal display 10 includes a light guide plate 23 for guiding light incident from the side in an upward direction, and light emitted from the light guide plate 23 to all areas of the upper surface. It includes an optical sheet 24 for evenly dispersing and improving straightness, and this backlight unit is fixed by a mechanism structure composed of a guide panel 31 and a bottom cover 33.

Particularly, in the liquid crystal display module of this structure, the guide panel 31 is provided with a liquid crystal panel (not shown) on a seating portion protruding therein, and the light guide plate 23 is disposed at a position corresponding to the rear surface of the liquid crystal panel. It is bordered by the guide panel 31.

The liquid crystal display module of the above-described structure can be easily displaced between each component even by a weak external shock. In particular, since the light guide plate 23 has a structure that is fixed by the sidewalls of the guide panel 31 without separate fixing means, flow due to external force may occur more easily than other components.

In order to prevent this problem, the locking portion 2 is formed on the side portion of the light guide plate 23, and the fixing portion 3 corresponding to the locking portion 2 is formed on the guide panel 31 to join the two portions. A structure has been proposed to prevent the flow of the light guide plate 23 as a seam, but when the tolerance between the light guide plate 23 and the guide panel 31 is small, assembly is difficult, and accordingly, the tact time of the assembly process is increased. ) Causes a problem of bending due to expansion. In addition, when the tolerance is large, there is a limitation that the locking portion 2 and the fixing portion 3 cannot properly perform their roles.

In addition, a structure has been proposed to replace the locking portion 2 and insert a separate pad between the light guide plate 23 and the guide panel 31, but this also delays the assembly process time and the pad shrinks at low temperature. In the case of returning to room temperature, the function of preventing the flow of the light guide plate was prevented due to loss of the function, and when assembling, the pad rides on the side wall of the light guide plate and rests on the bottom surface of the bottom cover 33. There was a problem that seating failure occurred or the working time was further delayed. The bad seating of the pad also affects the flatness when the optical sheet is inserted, the next assembly process.

As a result, when the light guide plate flows or bends due to the assembly process of the backlight unit according to the conventional structure, the emitted light is lost and the luminance is locally lowered or the luminance of the image displayed by the liquid crystal panel is lowered.

The present invention has been devised to solve the above-mentioned problems, and an object of the present invention is to improve the structure of a light guide plate and a guide panel of a conventional liquid crystal display module to minimize the flow of the light guide plate and simplify the assembly process. To provide.

In order to achieve the above object, a liquid crystal display module according to a preferred embodiment of the present invention, the liquid crystal panel; A backlight unit disposed on a rear surface of the liquid crystal panel and including a light guide plate having a cutting portion formed in at least one of four corners; And a guide panel in which the liquid crystal panel is seated and a protrusion inserted into the cutting portion is formed in at least one of four corners to guide the light guide plate in a direction perpendicular to the coupling direction.

According to an embodiment of the present invention, a cutting portion is formed on one side of the light guide plate of the backlight unit, and a protrusion having an inclined surface is formed on the guide panel of the mechanism structure, and the light guide plate is pushed vertically as it is inserted into the cutting portion. This has the effect of minimizing the flow and simplifying the assembly process of the liquid crystal display module.

1 is an exploded perspective view schematically showing a part of a backlight unit of a conventional liquid crystal display module and components coupled thereto.
2 is an exploded perspective view of the liquid crystal display module according to an embodiment of the present invention as viewed from the rear direction, and FIG. 3 is a cross-sectional view of the assembled liquid crystal display module according to an embodiment of the present invention.
4A and 4B are plan views of front and rear surfaces of a combined guide panel and a light guide plate of a liquid crystal display module according to an embodiment of the present invention.
5 is a perspective view of part A of FIG. 4B.
6 and 7 are enlarged perspective views of a portion of a guide panel and a light guide plate according to an embodiment of the present invention.

Hereinafter, a liquid crystal display module according to a preferred embodiment of the present invention will be described with reference to the drawings.

2 is an exploded perspective view of a liquid crystal display module according to an embodiment of the present invention viewed from the rear direction, and FIG. 3 is a cross-sectional view of the assembled liquid crystal display module according to an embodiment of the present invention.

2 and 3 together, the liquid crystal display module 100 of the present invention is disposed on the rear surface of the liquid crystal panel 110 and the liquid crystal panel 110 that displays an image, and cuts at least one of the four corners. The backlight unit 120 including the light guide plate 123 on which the portion 1235 is formed, and the liquid crystal panel 110 are seated, and a protrusion 1315 corresponding to the cutting portion 1235 is formed in at least one of four corners. It consists of a mechanism structure 130 including a guide panel 131 for fixing by applying a force to the cutting portion 1235 in a direction perpendicular to the coupling direction.

The liquid crystal panel 110 is formed of a liquid crystal layer (not shown) in which the array substrate 111 and the color filter substrate 112 are spaced apart by a predetermined distance and interposed therebetween. In addition, a driver IC 115 is mounted on one side of the array substrate 111 to implement an image as control and image signals are applied therefrom.

A thin film transistor, which is a switching element, and various wirings, pixels, and common electrodes are formed on the array substrate 111 constituting the liquid crystal panel 110. The color filter substrate 112 is formed with a color filter layer and a black matrix (BM) for displaying RGB colors. The driver IC 115 may include at least one of a gate driver providing a gate driving signal to turn-on/off the thin film transistor and a data driver providing a data signal to the pixel electrode. It may include, the gate driver may be implemented in the form of a thin film transistor on the liquid crystal panel 110. The liquid crystal panel 110 and the driver IC 115 may be electrically connected to an external system and a power supply (not shown) through a flexible substrate (not shown) bonded to one end of the array substrate 111.

In detail, the array substrate 111 of the liquid crystal panel 110 is arranged in one direction to form a plurality of gate wirings and data wirings defining a plurality of pixel regions. Each pixel area is provided with a thin film transistor that serves as a switching element. The thin film transistor is a gate electrode connected to a gate wiring, and a semiconductor layer formed by laminating amorphous silicon on top of the gate electrode, a source electrode and a drain electrode formed on the semiconductor layer and electrically connected to the data wiring and the pixel electrode. Is done.

In addition, the color filter substrate 112 is a color filter composed of a plurality of sub color filters that realize red, green, and blue colors, and distinguishes each sub color filter and transmits the liquid crystal layer. It consists of black matrix (BM) that blocks light.

The array and the color filter substrates 111 and 112 face each other by a sealant formed outside the image display area and are spaced apart at a predetermined distance to form a liquid crystal panel 100. In addition, although not shown, a polarizing plate (not shown) for linearly polarizing light incident and output may be attached to the outer surfaces of the bonded array and color filter substrates 111 and 112.

The backlight unit 120 includes an LED package 121, a lamp substrate 122, a light guide plate 123, an optical sheet 124 and a reflective sheet 125.

The LED package 121 is a plurality of light sources that are disposed on one side of the liquid crystal panel 110 and emit light, and are bonded in a line on one surface of the lamp substrate 122. The LED package 121 may include R, G, and B LED elements that emit monochromatic light of R (Red), G (Green), and B (Blue), or WLED elements in which one element emits white light. .

The LED package 121 is arranged in a line on the lamp substrate 122, and the light emitting surface faces the incident surface of the light guide plate 131 bounded by the guide panel 131. To this end, the lamp substrate 122 may be arranged side by side with the side wall of the guide panel 131 in a form in which the minor axis is erected in the vertical direction with the horizontal line.

The light guide plate 123 is disposed inside the guide panel 131 to correspond to the rear surface of the liquid crystal panel 110 and serves to guide light emitted from the LED package 121 in the direction of the liquid crystal panel 110 without possible loss. do. Accordingly, the light incident on the light guide plate 123 is repeatedly refracted and reflected by the diffusing agent added inside, and then proceeds to the other side, and then exits to the upper portion of the light guide plate 123.

In order to maximize light efficiency, the light guide plate 123 may have a light incident surface portion thicker than an opposite surface, and a pattern for improving light efficiency may be formed on the front and rear surfaces.

In particular, at least one edge of the light guide plate 123 according to the embodiment of the present invention is formed with a cutting portion 1235 formed in a predetermined depth. The cutting portion 1235 may be formed by further adding a cutting step in the manufacturing process of the light guide plate 123. The cutting portion 1235 is formed in a shape recessed in the inner direction of the light guide plate 123 and the two inner surfaces are inclined at a predetermined angle with respect to the horizontal line.

According to this structure, when the light guide plate 123 is mounted on the bottom cover 133 and the guide panel 131 is coupled to the top, the protrusion 1315 formed in the guide panel 131 is inserted into the cutting part 1235 Entering the interior along the inner inclined surface, the light guide plate 123 is pushed out in the horizontal direction by the inclined surface to be in close contact with each side of the bottom cover 133.

That is, the force f1 acting as the guide panel 131 is coupled to the upper portion of the light guide plate 123 in the Z direction is f2 along the inclined surface of the cutting portion 1235 inclined at a predetermined angle θ with respect to the horizontal surface, It becomes f3, and the light guide plate 123 is pushed out in the X direction and the Y direction. Two or more of these cutting portions 1235 may be formed, but in order to minimize the loss of light by the cutting portions 1235, it is formed at any one of the two corners opposite to the position where the LED package 121 is disposed. desirable.

Meanwhile, an optical sheet 124 is disposed above the light guide plate 123. The optical sheet 124 is a diffusion sheet 1241 that uniformly diffuses light emitted from the light guide plate 131 to all areas, and all areas of the liquid crystal panel 110 by condensing the light diffused by the diffusion sheet 1241 It consists of a plurality of prism sheets (1242, 1243) to ensure uniform light is supplied to.

Here, the diffusion sheet 1241 is usually provided with one sheet, but the prism sheets 1242 and 1243 are provided with two prisms so that they intersect in the x and y axis perpendicular to each other to refract light in the x and y axis directions. It can be configured to improve the straightness of light.

Then, in order to increase the light efficiency, a reflective sheet 125 reflecting the light emitted from the lower portion back to the light guide plate 123 again to advance to the liquid crystal panel 110 at the rear side of the light guide plate 123. Is placed.

The backlight unit 120 having the above-described structure is mounted in the mechanism structure 130 composed of the guide panel 131, the bottom cover 133, and the top case 134.

The guide panel 131 is a rectangular frame, and a seating portion 1311 on which the liquid crystal panel 110 is seated is formed inward, and the liquid crystal panel 110 is attached to the upper portion by a light-shielding tape (not shown). In the inside, the light guide plate 123 and the optical sheet 124 are mounted in a stacked form. Here, the light shielding tape not only attaches and fixes the liquid crystal panel 110 to the guide panel 131, but also functions to prevent light leakage defects from the light emitted from the backlight unit 120 leaking to the outside.

Particularly, one of the corners of the guide panel 131 has a protrusion 1315 having an inclined surface corresponding to the cutting part 1235 of the light guide plate 123 inward, and when the guide panel 131 is coupled, the protrusion ( 1315) will be assembled in the form of being inserted into the cutting portion 1235.

The protrusion 1315 has an inclined surface whose thickness gradually decreases from the seating portion 1311 toward the light guide plate 123. Therefore, when the guide panel 131 is coupled to the upper portion of the light guide plate 123 mounted on the bottom cover 133, the seating portion 1311 slides along the inclined surface of the cutting portion 1235 and is pushed out. . Accordingly, the light guide plate 123 is in close contact and fixed to each side wall of the bottom cover 133.

That is, in the assembly process of the light guide plate, the coupling step of the protrusion (2 in FIG. 1) or the pad insertion step is omitted, and the alignment of the light guide plate 123 is simultaneously performed in the assembly process of the guide panel 123.

The guide panel 131 may be manufactured by an injection molding method using a synthetic resin material integrally with the protrusion 1315.

According to this structure, the liquid crystal display module of the present invention is aligned simultaneously with the combination of the cutting portion 1235 and the protrusion 1315 without a separate alignment process with respect to the light guide plate 131, thereby simplifying the assembly process and the light guide plate 131. This is fixed stably.

Hereinafter, the coupling structure of the guide panel and the light guide plate included in the liquid crystal display module of the present invention will be described in detail with reference to the drawings.

4A and 4B are plan views of front and rear surfaces of a combined guide panel and a light guide plate of a liquid crystal display module according to an embodiment of the present invention.

Referring to Figures 4a and 4b, the guide panel 131 of the present invention is coupled in the front direction of the light guide plate 123 is in close contact with the rear surface of the seating portion 1311 to which the liquid crystal panel is seated. Although not shown, in the actual assembly of the liquid crystal display module, optical sheets (124 in FIG. 2) are interposed above the light guide plate 123. In particular, although not exposed in the front direction, one of the four corners of the guide panel 131 is formed with a protrusion 1315 of a predetermined size as the rear surface of the seat 1311, and the light guide plate 123 has a protrusion 1315. A cutting portion 1235 is formed at a corresponding position. The protrusion 1315 has a shape in which the width becomes narrower toward the lower direction, and is formed to have a lower height than the side wall of the guide panel 131 so as not to contact the bottom surface of the bottom cover (not shown) to be joined later. The end of the protruding portion 1315 may be formed in a round shape in order to prevent a gap when engaged with the light guide plate 123. As the protruding portion 1315 is inserted into the cutting portion 1235, each side surface of the light guide plate 123 is coupled to each side wall of the guide panel 131 in close contact with each other.

FIG. 5 is a perspective view of part A of FIG. 4B, in which the force in the upper direction (Z direction) of the guide panel 131 is along the inclined surface of the cutting portion 1235 of the light guide plate 123 in the X direction. And pushed in the Y direction. Accordingly, the width of the light guide plate 123 should be determined within a range in which no warpage occurs in close contact with the side wall of the bottom cover in consideration of the distance to be pushed out.

6 and 7 are enlarged perspective views of a portion of a guide panel and a light guide plate according to an embodiment of the present invention.

6 and 7, a protrusion 1315 having a predetermined height is formed inward at one corner where two side walls of the guide panel 131 of the present invention meet. The upper surface of the protrusion 1315 is a rectangular shape, and its height is formed lower than the sidewall of the guide panel 131. An opening 1316 for fixing with the bottom cover may be further formed on the side wall of the guide panel 131, and the upper surface of the protrusion 1315 is formed to a degree that does not contact the bottom surface when combined with the bottom cover. When the guide panel 131 is manufactured, these protrusions may be integrally formed, or may be formed of a separate resin material and attached to a corresponding position.

In addition, two side surfaces of the protrusion 1315 are formed to be inclined at a predetermined angle (θ1) with a horizontal line, and the angle is determined within a range of 100° or more and 150°.

In addition, a cutting portion 1235 is formed at one edge of the light guide plate 123 at a position corresponding to the protrusion 1315. As shown, the cutting portion 1235 is a rectangular shape when viewed from the top and bottom, and is made of an inclined surface so that its width becomes narrower from the top to the bottom. That is, the inclined surface has an angle θ2 formed with the horizontal line is less than 90°, and is determined within a range of about 30° to 80° so as to correspond to the side surface of the protrusion 1315.

The cutting portion 1235 may be formed by cutting using a bending device when cutting the base plate in the light guide plate manufacturing process.

When assembling the liquid crystal display module by the above-described coupling structure of the protrusion and the cutting unit, the light guide plate can be stably fixed even when a separate fixing means such as a pad is omitted, thereby simplifying the assembly process and reducing assembly defects. It becomes possible.

Although many matters are specifically described in the foregoing description, it should be interpreted as an example of a preferred embodiment rather than limiting the scope of the invention. Therefore, the invention should not be determined by the described embodiments, but should be determined by equivalents to the claims and claims.

100: liquid crystal display module 110: liquid crystal panel
111: array substrate 112: color filter substrate
120: backlight unit 121: LED package
122: lamp substrate 123: light guide plate
124: optical sheet 125: reflective sheet
130: mechanism structure 131: guide panel
133: bottom cover 134: top case
1235: cutting portion 1315: protrusion

Claims (13)

Liquid crystal panel;
A backlight unit disposed on the rear surface of the liquid crystal panel and including a light guide plate having a cutting portion formed in at least one of four corners; And
The liquid crystal panel is seated, and is formed of a mechanism structure including a guide panel for fixing the light guide plate in a direction perpendicular to the coupling direction by forming a protrusion inserted into the cutting part at at least one of four corners,
The protrusion is formed integrally with the guide panel, and the liquid crystal display module is formed of an inclined surface whose width gradually decreases from the top to the bottom. According to claim 1,
The cutting portion,
When viewed from the front and rear, the liquid crystal display module, characterized in that the square formed. According to claim 1,
The cutting portion,
A liquid crystal display module, characterized in that it is made of an inclined surface that is getting wider from the top to the bottom. The method of claim 3,
The inclined surface,
A liquid crystal display module, characterized in that the angle formed with the horizontal line is 30° to 80°. According to claim 1,
The protrusion,
A liquid crystal display module, characterized in that formed through the injection molding method. delete According to claim 1,
The reverse slope,
A liquid crystal display module, characterized in that the angle formed with the horizontal line is 100° to 150°. The method of claim 5,
The protrusion,
A liquid crystal display module, characterized in that as the guide panel is coupled to the light guide plate in the Z-axis direction, a force is applied to the light guide plate in the X-axis and Y-axis directions within the mechanism structure. The method of claim 5,
The protrusion,
A liquid crystal display module, characterized in that the height is formed lower than the sidewall of the guide panel. The method of claim 5,
The protrusion,
A liquid crystal display module, characterized in that the upper surface is formed in a round shape. According to claim 1,
The backlight unit,
A light source disposed on at least one side of the light guide plate; And
A plurality of optical sheets disposed on the front and back surfaces of the light guide plate
A liquid crystal display module, characterized in that it comprises a. According to claim 1,
The mechanism structure,
A bottom cover in which the backlight unit is mounted on a bottom surface and a side wall is coupled with the guide panel; And
A top case that borders the front side of the liquid crystal panel and side walls are coupled to the guide panel.
A liquid crystal display device module comprising a. 10. The liquid crystal display module of claim 8, wherein the inclined surface of the cutting portion and the inclined surface of the protruding portion are in close contact, so that the adhesive force in the Z-axis direction is converted in the X-axis and Y-axis directions with respect to the light guide plate.

Images