KR100972491B1 - Structure combinding liquid crystal display - Google Patents

Abstract

The present invention relates to a fastening structure of a liquid crystal display device, wherein the fastening structure of the liquid crystal display device of the present invention, the light emitting plate, the light guide plate which is emitted in one direction by receiving the light of the lamp, and reflects the light of the lamp A reflecting sheet incident to the light guide plate, a reflecting plate reflecting light propagating to the light guide plate back to the light guide plate, a lower cover supporting and protecting a lower portion of the reflecting sheet, and formed on one side of the lower cover. And a reflection sheet guide for suppressing deformation due to elasticity of the reflection sheet to maintain the shape of the reflection sheet, and at least one formed on the reflection sheet guide, and fixing the optical sheet through the optical sheet. At least one protrusion and at least one fixing hole penetrated by the protrusion is formed, and diffuses light supplied from the light guide plate. And an optical sheet condensed and emitted, thereby preventing the flow of the optical sheet, thereby improving image quality deterioration caused by the flow of the optical sheet.

Description

Fastening structure of liquid crystal display device {STRUCTURE COMBINDING LIQUID CRYSTAL DISPLAY}

1 is an exploded perspective view of a general liquid crystal display device.

2 is a diagram briefly showing an internal configuration of a small area liquid crystal display device;

3 is a plan view showing an optical sheet;

Figure 4a is a diagram showing a normal screen.

Figure 4b is a view showing the poor image quality when the optical sheet is flowed upward.

Figure 4c is a view showing the poor image quality that appears when the optical sheet is flowed downward.

FIG. 5A is a diagram schematically illustrating a fastening structure of a liquid crystal display according to a first embodiment of the present invention. FIG.

FIG. 5B is an enlarged view of the fastening of the reflective sheet guide and the optical sheet of FIG. 5A; FIG.

6A shows a liquid crystal display device according to a second embodiment of the present invention.

FIG. 6B is an enlarged view of the reflective sheet guide in FIG. 6A; FIG.

** Description of the symbols for the main parts of the drawings **

410: liquid crystal panel 441: light guide plate

442: lamp 443: reflective sheet

444: reflector 445: optical sheet                 

451: upper case 452: lower cover

453: reflective sheet guide 470: protrusion

The present invention relates to a fastening structure of a liquid crystal display device, and more particularly to a fastening structure of a liquid crystal display device for preventing the flow of the optical sheet.

In general, a liquid crystal display device includes a thin film transistor array substrate and a color filter substrate facing each other at regular intervals, and are provided in a predetermined space where the thin film transistor array substrate and the color filter substrate are bonded to each other. And a liquid crystal panel including a liquid crystal layer, a driving unit for driving the liquid crystal panel, and a backlight unit for supplying light to the liquid crystal panel.

In the thin film transistor array substrate, a plurality of data lines arranged at regular intervals vertically and a plurality of gate lines arranged at regular intervals laterally intersect with each other, and a pixel is defined in an area that is intersected with each other. Arranged in matrix form.

In addition, a color filter layer of red, green, and blue is formed at a position corresponding to the pixels on the color filter substrate, to prevent light leakage between the color filter layers, and to prevent color interference of light passing through the pixels. A black matrix is formed between the color filter layers.

Common electrodes and pixel electrodes are formed on opposite inner surfaces of the color filter substrate and the thin film transistor array substrate to apply an electric field to the liquid crystal layer. In this case, the pixel electrode is formed for each pixel on the thin film transistor array substrate, while the common electrode is integrally formed on the entire surface of the color filter substrate. Therefore, by controlling the voltage applied to the pixel electrode in the state where the voltage is applied to the common electrode, the light transmittance of the pixels can be individually controlled by changing the arrangement state of the liquid crystal molecules of the liquid crystal layer.

The backlight unit supplies light to a liquid crystal display device which does not emit light by itself. When light emitted from the backlight unit passes through the liquid crystal layer, light transmittance is determined by an arrangement state of liquid crystals to display an image.

The liquid crystal display as described above will be described in detail with reference to the accompanying drawings.

1 is an exploded perspective view of a general liquid crystal display device.

Referring to FIG. 1, a liquid crystal display device includes a liquid crystal panel 10 in which pixels are arranged in a matrix form; A gate driver 20 and a data driver 30 connected to side surfaces of the liquid crystal panel 10, respectively; The backlight unit 40 is disposed on the rear surface of the liquid crystal panel 10.

The liquid crystal panel 10 includes a thin film transistor array substrate and a color filter substrate which are bonded to face each other to maintain a uniform cell-gap, and a liquid crystal layer formed at a spaced interval between the color filter substrate and the thin film transistor array substrate.                         

A common electrode and a pixel electrode are formed in the liquid crystal liquid crystal panel where the thin film transistor array substrate and the color filter substrate are bonded to apply an electric field to the liquid crystal layer.

Therefore, when the voltage of the data signal applied to the pixel electrode is controlled while the voltage is applied to the common electrode, the liquid crystal of the liquid crystal layer rotates by dielectric anisotropy according to the electric field between the common electrode and the pixel electrode. For example, characters or images are displayed by transmitting or blocking light for each pixel.

In addition, switching elements such as thin film transistors are individually provided in the pixels in order to control the voltage of the data signal applied to the pixel electrode for each pixel.

The gate driver 20 and the data driver 30 are combined with the liquid crystal panel 10 in various forms to supply scan signals and image information to gate lines and data lines formed in the liquid crystal panel 10, thereby providing liquid crystals. The pixels of the panel 10 are driven.

The backlight unit 40 may include a light guide plate 41 disposed on a rear surface of the liquid crystal panel 10; A lamp 42 and a lamp housing 43 disposed on both side surfaces of the light guide plate 41; The reflective sheet 44 is disposed on the rear surface of the light guide plate 41, and an optical sheet 45 is disposed between the liquid crystal panel 10 and the light guide plate 41.

The light generated by the lamp 42 is incident on the side surface of the light guide plate 41 formed of a transparent material.

The reflective sheet 44 disposed on the rear surface of the light guide plate 41 reflects the light transmitted through the rear surface of the light guide plate 41 to the top surface of the light guide plate 41 to reduce the loss of light, and transmits the light to the top surface of the light guide plate 41. Improves the uniformity of the light being                         

Therefore, the light guide plate 41 transmits the light generated by the lamp 42 together with the reflective sheet 44 to the upper surface.

In the optical sheet 45 disposed between the liquid crystal panel 10 and the light guide plate 41, a diffusion sheet and a prism sheet may be applied, and a protective sheet may be added.

The diffusion sheet disperses the light incident from the light guide plate 41 to prevent the light from being partially concentrated, thereby preventing stains from occurring in the image displayed on the liquid crystal panel 10, and the angle of the light incident from the light guide plate 41. Refract vertically.

The prism sheet collects light incident from the diffusion sheet to be uniformly distributed on the entire surface of the liquid crystal panel 10.

The protective sheet protects the optical sheet 45 which is sensitive to dust and scratches, prevents the flow of the optical sheet 45 when the backlight unit 40 is transported, and diffuses light incident from the prism sheet. It can have a function to make the light more uniformly distributed.

On the other hand, the backlight unit 40 has an edge method provided with two lamps 42 on both sides of the light guide plate 41, but an edge method provided with a lamp may be applied to only one side of the light guide plate 41. Alternatively, the direct method in which the lamp 42 is disposed to correspond to the entire rear surface of the liquid crystal panel 10 may be applied.

The liquid crystal panel 10 and the backlight unit 40 are stacked on the main support 50, and the side surfaces of the stacked liquid crystal panel 10 and the backlight unit 40 are supported by the main support 50.                         

The upper edge of the liquid crystal panel 10 is compressed by the upper case 51, and the upper case 51 is coupled to the main support 50 by a screw.

On the other hand, the upper case 51 and the main support 50 may be coupled by a hook method. That is, the upper case 51 is formed by the insertion groove, the main support 50 to form a hook (hook) to the upper by the method of inserting the hook of the main support 50 into the insertion groove of the upper case 51. The case 51 and the main support 50 may be coupled to each other. In this case, a hook may be formed in the upper case 51, and an insertion groove may be formed in the main support 50.

The liquid crystal panel 10 and the backlight unit 40 are supported by a lower cover 52 disposed on the rear surface of the backlight unit 40, and the lower cover 52 is supported by the upper case 51 and a screw. Combined.

On the other hand, the lower cover 52 and the upper case 51 may be coupled by a hook method. That is, the lower cover 52 is formed by inserting grooves in the lower cover 52 and the upper case 51 by forming hooks to insert the hooks of the upper case 51 into the insertion grooves of the lower cover 52. ) And the upper case 51 may be coupled, and in this case, a hook may be formed in the lower cover 52, and an insertion groove may be formed in the upper case 51.

The driver 30 includes a printed circuit board 31. The printed circuit board 31 includes integrated circuit chips for generating various electrical signals for driving the pixels of the liquid crystal panel 10, and the electrical signals. Since wires for transmission are mounted, a constant area is required.

Therefore, the printed circuit board 31 disposed on the bottom surface of the lower cover 52 is protected by the cover shield 53 coupled to the lower cover 52 by screws.

In the liquid crystal display device as described above, the backlight unit 40 is provided below the liquid crystal panel 10 so that the light is supplied, so that the liquid crystal display device does not emit light by itself, thereby adjusting the light transmittance to display an image. To display.

The lamp 42 of the backlight unit 40 that supplies light to the liquid crystal panel 10 is a device that converts external electrical energy into light energy. As such, the lamp 42 converts electrical energy into light energy to radiate light to the liquid crystal panel 10 so that heat is also emitted. The heat is primarily emitted from the lamp housing 43 or the light guide plate 41. ), And is secondly emitted through the other structure combined with the lamp housing 43 and the light guide plate 41.

In recent years, liquid crystal display devices have been shortened in size and thin. In addition to the development of large area liquid crystal display devices, small area liquid crystal display devices have been actively developed. The small-area liquid crystal display device is used in a vehicle navigation apparatus, a portable imager, a mobile phone, and the like, and is gradually expanding its use range. Such a small area liquid crystal display device has a relatively simple internal structure because the internal space is narrower than that of a general liquid crystal display device, and should be made lightly.

The small area liquid crystal display as described above will be described in detail with reference to the accompanying drawings.

2 is a diagram briefly illustrating an internal configuration of a small area liquid crystal display.

Referring to FIG. 2, the LCD device reflects a lamp 142 that emits light, a light guide plate 141 that receives light from the lamp 142, and emits light upward, and reflects light from the lamp 142. The reflective sheet 143 incident to the light guide plate 141, the reflective plate 144 reflecting the light incident from the lamp 142, and proceeding to the upper portion of the light guide plate 141, and the incident light from the light guide plate 141. An optical sheet 145 for diffusing and condensing the light to be supplied to the upper portion, a lower cover 152 for supporting and protecting the reflective sheet 143 at the bottom, and a guide for pressing and fixing the optical sheet 145. A liquid crystal panel 110 provided on a panel 155 and an upper portion of the optical sheet 145 to adjust an optical transmittance of light supplied from the optical sheet 145 to display an image; The upper case 151 is pressed and combined with the side surface of the lower cover 152. It is configured to hereinafter.

The reflective sheet 143 protects the lamp 142 in a general liquid crystal display and functions the same as a lamp housing that reflects the light of the lamp 142 and enters the light guide plate 141. Unlike the lamp housing, the reflective sheet 143 uses the flexible and elastic non-metal reflective sheet 143 to reduce the weight of the liquid crystal display device. Such a reflective sheet 143 is mainly used in a small area liquid crystal display device. Since the reflective sheet 143 is made of a non-metal material having elasticity, the reflective sheet 143 does not maintain the shape of the U-shaped required to reflect the light of the lamp 142 and is continuously deformed. Accordingly, the reflective sheet guide 153 is formed on one side of the lower cover 152, and the reflective sheet guide 153 suppresses deformation due to elasticity of the reflective sheet 143, thereby causing the reflective sheet 143 to be removed. To maintain the shape.                         

The optical sheet 145 is stacked on the light guide plate 141, and the optical sheet 145 is fixed by a pressure applied from the top to the bottom by the guide panel 155. As described above, the small-area liquid crystal display device has a narrow internal space and is severely restricted by various structures provided therein, and thus it is difficult to form a site for mounting and fixing the optical sheet 145. Therefore, as described above, the optical sheet 145 is compressed by the guide panel 155 from above, thereby fixing the optical sheet 145.

However, since the optical sheet 145 cannot be sufficiently compressed and fixed by the guide panel 155, the flow of the optical sheet 145 occurs. When the optical sheet 145 flows inside the liquid crystal display device, the optical sheet 145 may directly affect the image quality, which will be described in detail with reference to FIGS. 3 and 4.

3 is a plan view showing an optical sheet.

Referring to FIG. 3, the light blocking pattern 261 is formed in the outer region of the optical sheet 245 to correspond to the position of the lower reflective sheet, thereby preventing light leakage of light leaking from the reflective sheet. That is, the reflective sheet is made of a flexible non-metallic material so that the reflective sheet does not come into close contact with the light guide plate, and there is a minute gap between the light guide plate and the reflective sheet. Accordingly, the light blocking pattern 261 of the optical sheet 245 blocks light leaking between the reflective sheet and the light guide plate, thereby preventing the light leaking from being displayed as an image through the liquid crystal panel.

However, as described above, since the optical sheet 245 is not fixed accurately inside the liquid crystal display device and flows, the optical sheet 245 changes according to the flow of the optical sheet 245 to the position of the light blocking pattern 261. As such, when the light blocking pattern 261 flows, the light emitted from the reflecting plate and the light guide plate cannot be completely blocked. In this case, the phenomenon occurring will be described with reference to FIG. 4.

Figure 4a is a view showing a normal screen, Figure 4b is a diagram showing the image quality defects appearing when the optical sheet is moved upward, Figure 4c is a diagram showing the image quality defects appearing when the optical sheet is flowed downward.

4A, 4B, and 4C illustrate a plan view of the liquid crystal display, and the upper case 351 is crimped and protected from the outside of the liquid crystal panel. Although not shown in the drawings, an optical sheet is provided below the liquid crystal panel.

As shown in the figure, when the optical sheet is not flowing, the normal luminance 360 is displayed on the liquid crystal panel. If the optical sheet is moved upward, the light blocking pattern that blocks the space between the reflective sheet and the light guide plate is also moved upward, so that light leaking between the reflective sheet and the light guide plate passes through the liquid crystal panel. The upper region of the liquid crystal panel is displayed as a white line with bright luminance. The white line is called a bright line. In addition, a black line having a low luminance is displayed in the lower region of the liquid crystal panel, and the light blocking pattern is displayed as a black line as the light blocking pattern overlaps the image display area of the liquid crystal panel. The black line is called a black line.

As described above, the bright lines appearing in the upper region of the liquid crystal panel and the black lines appearing in the lower region are shown in FIG. 4B.

On the other hand, when the optical sheet is moved to the lower side of the liquid crystal panel, the opposite phenomenon occurs. As shown in FIG. 4C, black lines appear in the upper region of the liquid crystal panel and bright lines appear in the lower region.

As described above, black lines and bright lines are displayed on the liquid crystal panel due to the flow of the optical sheet in the liquid crystal display device, which causes deterioration in image quality.

 The present invention has been made to solve the conventional problems as described above, the object of the present invention is to prevent the flow of the optical sheet, the liquid crystal that can improve the image quality degradation of the liquid crystal panel caused by the flow of the optical sheet It is to provide a fastening structure of the display device.

In order to achieve the object of the present invention as described above, a fastening structure of a liquid crystal display device includes a lamp that emits light, a light guide plate that is emitted in one direction by receiving light from the lamp, and reflects the light of the lamp to enter the light guide plate. And a reflecting sheet to reflect the light propagating to the rear surface of the light guide plate and to supply the light back to the light guide plate, a lower cover which supports and protects a lower portion of the reflecting sheet, and is formed on one side of the lower cover. A reflection sheet guide for suppressing deformation due to elasticity of the sheet to maintain the shape of the reflection sheet, at least one formed on the reflection sheet guide, and a protrusion and the protrusion to fix the optical sheet through the optical sheet. At least one fixing hole penetrates the light guide plate, and diffuses and condenses the light supplied from the light guide plate. It is configured to include an optical sheet that emits.                     

FIG. 5A is a view schematically illustrating a fastening structure of the liquid crystal display according to the first embodiment of the present invention, and FIG. 5B is an enlarged view of the fastening of the reflective sheet guide and the optical sheet of FIG. 5A.

As shown in the drawing, the liquid crystal display includes a lamp 442 for emitting light, a light guide plate 441 for receiving light emitted from the lamp 442 and incident in one direction, and an emission from the lamp 442. A reflection sheet 443 for reflecting light to be incident on the light guide plate 441, a reflection plate 444 for reflecting light propagating toward the rear surface of the light guide plate 441 and incident on the light guide plate 441, and the reflection A lower cover 452 for supporting and protecting a lower portion of the sheet 443, an optical sheet 445 for diffusing and condensing light supplied from the light guide plate 441 and incident in one direction, and the lower cover 452. A reflective sheet guide 453 formed on one side to maintain the shape of the reflective sheet 442 and a protrusion 470 formed on the reflective sheet guide 453 and fixed to penetrate the optical sheet 445. And, supplied from the optical sheet 445 It comprises a liquid crystal panel 410 for controlling the light transmittance to display an image, and an upper case 451 that is pressed on the liquid crystal panel 410 from the top, and coupled to the side of the lower cover 451 do.

In the liquid crystal display, a guide panel for pressing and fixing the optical sheet 445 is removed from the top, and a protrusion 470 is formed on the reflective sheet guide 453 to prevent the optical sheet 445 from flowing. do. The protrusion 470 penetrates through the fixing hole 480 of the optical sheet 445 to fix the optical sheet 445. At least one protrusion 470 is formed on the reflective sheet guide 453, and in order to increase coupling force with the optical sheet 445, a plurality of protrusions 470 may be formed.

Since the protrusion 470 and the fixing hole 480 correspond to each other, the number of the protrusion 470 and the number of the fixing holes 480 of the optical sheet 445 should be the same.

Meanwhile, the liquid crystal display of FIGS. 5A and 5B shows an edge type method of supplying light of a lamp to the side of the light guide plate. The edge type may be provided only on one side of the liquid crystal display, or may be provided on a plurality of sides of the liquid crystal display to improve luminance. If the lamp 442 is provided only on one side of the LCD, the reflective sheet guide 453 may also be provided only on one side of the lamp 442. Accordingly, the protrusion 470 formed on the reflective sheet guide 453 may also be formed on only one side of the liquid crystal display to couple with the fixing hole 480 of the optical sheet 445. In addition, when the lamps 442 are provided at both sides of the liquid crystal display, the reflective sheet guide 453 and the protrusion 470 are also provided at both sides of the liquid crystal display, thereby improving the bonding force with the optical sheet 445. . In order to increase the luminance of the liquid crystal display, a lamp 442 may be provided on a plurality of sides of the liquid crystal display.

Another embodiment for preventing the flow by fixing the optical sheet 445 has been created, will be described in detail below with reference to the accompanying drawings.

FIG. 6A is a view showing a liquid crystal display according to a second embodiment of the present invention, and FIG. 6B is an enlarged view of a reflection sheet guide in FIG. 6A.                     

As shown in the figure, the liquid crystal display device includes a lamp 542 for emitting light, a light guide plate 541 for receiving light emitted from the lamp 542 and incident in one direction, and exiting from the lamp 542. A reflective sheet 543 reflecting light to be incident on the light guide plate 541, a reflecting plate 544 reflecting light traveling to the rear surface of the light guide plate 541 and incident on the light guide plate 541, and the reflection A lower cover 552 that supports and protects a lower portion of the sheet 543, an optical sheet 545 for diffusing and condensing light supplied from the light guide plate 541 and incident in one direction, and the lower cover 552. At least one is formed on one side of the reflective sheet guide 553 for pressing and fixing the reflective sheet 542 and the optical sheet 545, and the light transmittance of the light supplied from the optical sheet 545 by adjusting the image, The liquid crystal panel 510 and Pressing the forward panel 510 at the top and is configured to include an upper case 551 is coupled with the side surface of the lower cover (551).

In the second embodiment, no protrusion is formed in the first embodiment. As shown, in the second embodiment, the height of the reflective sheet guide 553 is formed by extending the set length ΔL, and a part of the optical sheet 545 is disposed below the reflective sheet guide 553. Is inserted. A predetermined space is formed between the reflective sheet guide 553 and the reflective sheet 544 by the set length ΔL, and the optical sheet 545 inserted in the predetermined space is the reflective sheet guide 553. And it is pressed and fixed on both sides by the reflective sheet (544).

The set length ΔL determining the height at which the reflective sheet guide 553 extends may be determined according to the thickness of the optical sheet 554. That is, when the set length ΔL is smaller than the thickness of the optical sheet 554, the elastic sheet may be elastically inserted when the optical sheet 554 is inserted between the reflective sheet guide 553 and the reflective sheet 544. Since the excitation reflection sheet 543 is bent downward, it is impossible to properly reflect the light of the lamp 542. When the set length ΔL is greater than the thickness of the optical sheet 554, the clearance is left even when the optical sheet 554 is inserted between the reflective sheet guide 553 and the reflective sheet 554. Since it is weakly compressed, the flow of the optical sheet 554 cannot be prevented properly.

One or more reflective sheet guides 553 may be formed on one side of the lower cover 552 as shown in FIG. 6B. In addition, in order to increase the coupling force with the reflective sheet 554 for pressing the optical sheet 554, one reflective sheet guide 553 may be formed on the one side of the lower cover 552 as a whole.

On the other hand, when the lamp is provided on a plurality of sides of the liquid crystal display device as in the first embodiment, the reflective sheet guide 553 may be formed on at least one side of the liquid crystal display device.

As described above, the fastening structure of the liquid crystal display device according to the present invention combines the protrusion formed on the reflective sheet guide and the fixing hole of the optical sheet or inserts the optical sheet between the reflective sheet guide and the reflective sheet having a set length. By preventing the flow by fixing the optical sheet, it is possible to improve the deterioration in image quality due to the flow of the optical sheet.

Claims (8)

Lamps emitting light; A light guide plate which receives light from the lamp and exits in one direction; A reflection sheet reflecting light of the lamp and incident on the light guide plate; A reflection plate reflecting light traveling to the rear surface of the light guide plate and resupplying the light guide plate; A lower cover supporting and protecting a lower portion of the reflective sheet; A reflection sheet guide formed on one side of the lower cover to maintain a shape of the reflection sheet by suppressing deformation due to elasticity of the reflection sheet; At least one is formed on the reflective sheet guide, the projection for fixing the optical sheet through the optical sheet; And At least one fixing hole penetrated by the protrusion is formed, and the fastening structure of the liquid crystal display device, characterized in that it comprises an optical sheet for diffusing and condensing the light supplied from the light guide plate. The fastening structure of a liquid crystal display device according to claim 1, wherein the number of the protrusions and the fixing holes is the same. The fastening structure of a liquid crystal display device according to claim 1, wherein the fixing hole is formed at least on one side of the optical sheet. The fastening structure of a liquid crystal display device according to claim 1, wherein the protrusion part is formed on at least one side of the optical sheet corresponding to the fixing hole. Lamps emitting light; A light guide plate which receives light from the lamp and exits in one direction; A reflection sheet reflecting light of the lamp and incident on the light guide plate; A reflector plate for reflecting light traveling to the rear surface of the light guide plate and incident on the light guide plate; A lower cover supporting and protecting a lower portion of the reflective sheet; At least one reflection sheet guide formed on one side of the lower cover and having a height extended according to a set length; And an optical sheet inserted between the reflective sheet guide and the reflective sheet and fixed by pressing the reflective sheet guide and the reflective sheet. 6. The fastening structure of a liquid crystal display device according to claim 5, wherein the set length is determined by a thickness of the optical sheet. The fastening structure of the liquid crystal display device according to claim 5, wherein the reflective sheet guide is formed on at least one side of the lower cover. 6. The fastening structure of a liquid crystal display device according to claim 5, wherein the reflective sheet guide is connected in its entirety.

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