KR20040071833A - Liquid crystal display device - Google Patents

Abstract

PURPOSE: An LCD(Liquid Crystal Display) is provided to prevent impurities from being introduced into the LCD. CONSTITUTION: An LCD includes a support main(114), an LCD panel(106), a guide panel(130), and a plate bottom(120). The LCD panel is located on the support main. The guide panel is placed on the support main and holds the LCD panel. The guide panel has a depression(132). The plate bottom is arranged between the support main and the guide panel and has a protrusion combined with the depression of the guide panel. The LCD further includes a back light unit and a case top(120). The back light unit is located between the support main and the LCD panel. The case top surrounds the edge of the LCD panel and the side of the support main.

Description

Liquid crystal display {LIQUID CRYSTAL DISPLAY DEVICE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device capable of preventing foreign substances from flowing into the liquid crystal display device.

A typical liquid crystal display device is composed of a liquid crystal display module, a driving circuit portion and a case for driving the liquid crystal display module.

The liquid crystal display module includes a liquid crystal panel in which liquid crystal cells are arranged in a matrix form between two glass substrates, and a back light unit for irradiating light to the liquid crystal panel. In addition, in the liquid crystal display module, light sheets for vertically raising light traveling from the backlight unit toward the liquid crystal panel are arranged. The liquid crystal panel, the backlight unit and the light sheet should be fastened in an integrated form to prevent light loss and should be protected from damage by external impact. To this end, a case for a liquid crystal display device formed to surround the backlight unit and the light sheets including the edge of the liquid crystal panel is provided.

Referring to FIG. 1, a conventional liquid crystal display device includes a support main 14, a backlight unit and a liquid crystal panel 6 stacked inside the support main 14, a backlight unit and a liquid crystal panel 6. A guide panel 30 disposed between the back panel and the support panel 14 for supporting the liquid crystal panel 6; A plate bottom 20 disposed between the guide panel 30 and the support main 14, and a case top 2 for fixing the guide panel 30 and the liquid crystal panel 6. It is provided.

The liquid crystal panel 6 includes a spacer (not shown) for injecting liquid crystal between the upper substrate 3 and the lower substrate 5 and for maintaining a constant gap between the upper substrate 3 and the lower substrate 5. . In the upper substrate 3 of the liquid crystal panel 6, a color filter, a common electrode, a black matrix, and the like, which are not shown, are formed. In addition, signal lines such as data lines and gate lines (not shown) are formed on the lower substrate 5 of the liquid crystal panel 6, and thin film transistors (“TFT”) are formed at the intersections of the data lines and the gate lines. Is formed. The TFT switches the data signal to be transmitted from the data line toward the liquid crystal cell in response to the scan signal (gate pulse) from the gate line. The pixel electrode is formed in the pixel region between the data line and the gate line. In addition, one side of the lower substrate 5 is formed with a pad region for connecting data lines and gate lines, respectively, and a tape carrier (not shown) in which a driver integrated circuit for applying a driving signal to a TFT is mounted on the pad region. The package (Tape Carrier Package) is attached. The tape carrier package supplies data signals and scan signals to the data lines and the gate lines from the driver integrated circuit, respectively.

The upper polarizing sheet 4a is attached to the upper substrate 3 of the liquid crystal panel 6, and the lower polarizing sheet 4b is attached to the rear surface of the lower substrate 5. At this time, the upper and lower polarizing sheets 4a and 4b serve to extend the viewing angle of the image displayed by the liquid crystal cell matrix.

The support main 14 is a mold, and the side wall surface thereof is formed into a stepped stepped surface. The innermost layer of the support main 14 is equipped with a backlight unit comprising a reflective sheet 12, a light guide plate 10 and a plurality of optical sheets 8 and a lamp housing not shown.

The backlight unit includes a lamp (not shown), a lamp housing surrounding the lamp, a light guide plate 10 for propagating light incident from the lamp toward the liquid crystal panel 6, and a reflective sheet 12 disposed on the rear surface of the light guide plate 10. ) And a plurality of optical sheets 8 stacked on the light guide plate 10.

Light generated by the lamp is incident on the light guide plate 10 through an incident surface existing on the side of the light guide plate 10. The lamp housing reflects light from the lamp toward the incident surface of the light guide plate 10. The light guide plate 10 is manufactured by injection molding and scattering pattern printing by a mold, and " V " -shaped groove cutting. The light guide plate 10 converts the light incident from the lamp through the incident surface into a planar light source and emits the light toward the liquid crystal panel 6.

The reflective sheet 12 serves to reduce light loss by rereflecting light incident to itself through the rear surface of the light guide plate 10 toward the light guide plate 10. That is, when light from the lamp is incident on the light guide plate 10, the light propagated toward the lower surface and the side surface of the light guide plate 10 is reflected by the reflective sheet 12 and travels toward the front surface.

The plurality of optical sheets 8 generates light emitted from the light guide plate 10 vertically to improve light efficiency. To this end, diffusion sheets for diffusing the light emitted from the light guide plate 10 to the entire region and two prism sheets for raising the propagation angle of the light diffused by the diffusion sheets perpendicular to the liquid crystal panel 6 are provided. do. Accordingly, the light emitted from the light guide plate 10 is incident on the liquid crystal panel 6 via the plurality of optical sheets 8 via the diffusion sheet.

The guide panel 30 is seated on the support main 14 as a mold, and a stepped portion on which the liquid crystal panel 6 is seated is provided. The liquid crystal panel 6 is seated on the front surface of the stepped portion, and the rear surface presses a plurality of optical sheets 8 stacked on the light guide plate 10.

The plate bottom 20 is bent vertically upward from the first horizontal plane and disposed between the reflective sheet 12 and the support main 14 and disposed between the side surface of the backlight unit and the stepped surface of the support main. Bent horizontally from the first vertical plane and from the first vertical plane and vertically bent downward from the second horizontal plane and the second horizontal plane disposed between the guide panel 30 and the upper surface of the support main 14 to support the support main 14. And a second vertical surface surrounding the side. The plate bottom 20 is a press of aluminum and emits heat generated from the backlight unit and serves as a ground of the liquid crystal display module.

As such, the guide panel 30 is stacked on the plate bottom 20. At this time, the guide panel 30 is laminated on the second horizontal plane of the plate bottom 20.

The case top 2 is manufactured in the form of a square strip having a flat portion and a side portion bent at a right angle. The case top 2 surrounds the edge of the liquid crystal panel 6 and the guide panel 30 fastened to the support main 14.

Such a conventional liquid crystal display device may not be accurately matched due to the tolerance of the plate bottom 20 and the guide panel 30 when the plate bottom 20 and the guide panel 30 are stacked on the support main 14. Therefore, a gap G is generated between the plate bottom 20 and the guide panel 30. The foreign matter is introduced into the backlight unit through the gap G between the plate bottom 20 and the guide panel 30. For this reason, the conventional liquid crystal display device has a problem in that the image quality displayed on the liquid crystal panel 6 is deteriorated due to the foreign matter introduced through the gap G between the plate bottom 20 and the guide panel 30.

In order to solve this problem, another conventional liquid crystal display device attaches a double-sided tape or pads (not shown) on the second horizontal surface of the plate bottom 20 or double-sided tapes or pads on the back surface of the guide panel 30. By attaching the back, the gap G between the plate bottom 20 and the guide panel 30 is removed to prevent foreign matter from penetrating. However, another conventional liquid crystal display device has a disadvantage in that the material cost is increased and productivity is lowered due to the double-sided tape or pads disposed between the plate bottom 20 and the guide panel 30.

Accordingly, an object of the present invention is to provide a liquid crystal display device capable of preventing foreign substances from flowing into the liquid crystal display device.

1 is a cross-sectional view schematically showing a cross section of a conventional liquid crystal display device.

2 is a cross-sectional view schematically illustrating a cross section of a liquid crystal display according to a first embodiment of the present invention.

3 is a cross-sectional view schematically illustrating a cross section of a liquid crystal display according to a second exemplary embodiment of the present invention.

4 is a cross-sectional view schematically illustrating a cross section of a liquid crystal display according to a third exemplary embodiment of the present invention.

<Description of Symbols for Main Parts of Drawings>

2,102,202,302: Case top 3,103,203,303: Upper board

4a, 104a, 204a, 304a: upper polarizing sheet 5, 105, 205, 305: lower substrate

4b, 104b, 204b, 304b: Lower polarizing sheet 6,106,206,306: Liquid crystal panel

8,108,208,308: Optical sheets 10,110,210,310: Light guide plate

12,112,212,312: Reflective sheet 14,114,214,314: Support main

20,120,220,320: Plate bottom 30,130,230,330: Guide panel

122,222,332: protrusions 132,232,322: grooves

In order to achieve the above object, a liquid crystal display according to an exemplary embodiment of the present invention includes a support main, a liquid crystal panel stacked on the support main, and a liquid crystal panel stacked on the support main and supporting the liquid crystal panel and having an uneven surface. And a plate bottom disposed between the panel guide and the support main and the panel guide, the plate bottom having a concave-convex surface mating with the concave-convex surface of the panel guide.

The liquid crystal display may further include a backlight unit stacked between the support main and the liquid crystal panel, and a case top surrounding an edge of the liquid crystal panel and a side surface of the support main.

In the liquid crystal display, the plate bottom is bent horizontally from a first horizontal plane disposed on the backlight unit and the support main, a first vertical plane bent vertically upward from the first horizontal plane, and the first vertical plane. And a second vertical plane on which the uneven surface is formed, and a second vertical plane bent vertically downward from the second horizontal plane.

In the liquid crystal display, the second vertical surface of the plate bottom is connected to the case top to ground the plate bottom.

The uneven surface formed on the bottom plate of the liquid crystal display device is bent in a "∩" shape.

Other objects and features of the present invention in addition to the above objects will become apparent from the description of the embodiments with reference to the accompanying drawings.

Hereinafter, exemplary embodiments of the present invention will be described with reference to FIGS. 2 and 3.

2, the liquid crystal display according to the first exemplary embodiment of the present invention includes a support main 114, a backlight unit and a liquid crystal panel 106 stacked inside the support main 114, Grooves 132 are formed on the rear surface and are disposed between the backlight unit and the liquid crystal panel 106 to support the liquid crystal panel 106, and between the backlight unit and the support main 114. ; A plate bottom 120 and a guide panel 130 disposed between the guide panel 130 and the support main 114 and protruding from the protrusion 122 that is joined to the groove 132 of the guide panel 130. ) And a case top 102 for fixing the liquid crystal panel 106.

The liquid crystal panel 106 includes a spacer (not shown) for injecting liquid crystal between the upper substrate 103 and the lower substrate 105 to maintain a constant gap between the upper substrate 103 and the lower substrate 105. . The upper substrate 103 of the liquid crystal panel 106 is formed with a color filter, a common electrode, a black matrix, and the like, which are not shown. In addition, signal lines such as data lines and gate lines (not shown) are formed on the lower substrate 5 of the liquid crystal panel 106, and thin film transistors ("TFTs") are formed at intersections of the data lines and the gate lines. Is formed. The TFT switches the data signal to be transmitted from the data line toward the liquid crystal cell in response to the scan signal (gate pulse) from the gate line. The pixel electrode is formed in the pixel region between the data line and the gate line. In addition, one side portion of the lower substrate 5 is provided with a pad region for connecting data lines and gate lines, respectively, and a tape carrier (not shown) in which a driver integrated circuit for applying a driving signal to a TFT is mounted on the pad region. The package (Tape Carrier Package) is attached. The tape carrier package supplies data signals and scan signals to the data lines and the gate lines from the driver integrated circuit, respectively.

The upper polarizing sheet 104a is attached to the upper substrate 103 of the liquid crystal panel 106, and the lower polarizing sheet 104b is attached to the rear surface of the lower substrate 105. At this time, the upper and lower polarizing sheets 104a and 104b are responsible for extending the viewing angle of the image displayed by the liquid crystal cell matrix.

The support main 114 is a mold, and the side wall surface thereof is formed into a stepped stepped surface. The innermost layer of the support main 114 is equipped with a backlight unit including a reflective sheet 112, a light guide plate 110 and a plurality of optical sheets 108 and a lamp housing (not shown).

The backlight unit includes a lamp (not shown), a lamp housing surrounding the lamp, a light guide plate 110 for propagating light incident from the lamp toward the liquid crystal panel 106, and a reflective sheet 112 disposed on the rear surface of the light guide plate 110. And a plurality of optical sheets 108 stacked on the light guide plate 110.

Light generated by the lamp is incident on the light guide plate 110 through an incident surface existing on the side of the light guide plate 110. The lamp housing reflects light from the lamp toward the incident surface of the light guide plate 110. The light guide plate 110 is manufactured by injection molding, scattering pattern printing by a mold, and "V" shaped groove cutting. The light guide plate 110 converts the light incident from the lamp through the incident surface into a planar light source and emits the light toward the liquid crystal panel 106.

The reflective sheet 112 serves to reduce light loss by rereflecting light incident to the light guide plate 110 toward the light guide plate 110 through the rear surface of the light guide plate 110. That is, when light from the lamp is incident on the light guide plate 110, the light traveling toward the lower surface and the side surface of the light guide plate 110 is reflected by the reflective sheet 112 and travels toward the front surface.

The plurality of optical sheets 108 generates light emitted from the light guide plate 110 vertically to improve light efficiency. To this end, diffusion sheets for diffusing the light emitted from the light guide plate 110 to the entire region and two prism sheets for raising the propagation angle of the light diffused by the diffusion sheets perpendicular to the liquid crystal panel 106 are provided. do. Accordingly, the light emitted from the light guide plate 110 is incident on the liquid crystal panel 106 via the plurality of optical sheets 108 via the diffusion sheet.

The guide panel 130 is seated on the support main 114 as a mold, and a stepped portion on which the liquid crystal panel 106 is seated is provided. The liquid crystal panel 106 is seated on the front surface of the stepped portion, and the rear surface presses a plurality of optical sheets 108 stacked on the light guide plate 110. In addition, the groove 132 formed on the rear surface of the guide panel 130 is formed to face the upper surface of the support main 114. In the groove 132 of the guide panel 130, the protrusion 122 of the plate bottom 120 is inserted into the groove 132.

The plate bottom 120 is a press made of aluminum and emits heat generated from the backlight unit and serves as a ground of the liquid crystal display module.

To this end, the plate bottom 120 is bent vertically upward from the first horizontal plane and the first horizontal plane disposed between the reflective sheet 112 and the support main 114, so that the side surface of the backlight unit and the support main 114 are closed. Bent horizontally from the first vertical plane disposed between the stepped surfaces and the first vertical plane and vertically bent downward from the second horizontal plane and the second horizontal plane disposed between the upper surface of the guide panel 130 and the support main 114. It is composed of a second vertical surface surrounding the side surface of the support main 114 and connected to the case top 102. In addition, the second vertical surface is connected to the case top 102 to ground the plate bottom 120.

The protrusion 122 of the plate bottom 120 protrudes in a shape of “∩” in the second horizontal plane so as to be inserted into the groove 132 of the guide panel 130 to be joined.

As such, the guide panel 130 is stacked on the plate bottom 120. At this time, the groove 132 formed on the rear surface of the guide panel 130 is inserted into the protrusion 122 of the "∩" shape formed on the second horizontal surface of the plate bottom 120 and is molded.

The case top 102 is manufactured in the form of a square strip having a flat portion and a side portion bent at a right angle. The case top 102 surrounds the guide panel 130 fastened to the edge of the liquid crystal panel 106 and the support main 114.

In the liquid crystal display according to the first exemplary embodiment of the present invention, the groove 132 and the plate formed on the rear surface of the guide panel 130 when the plate bottom 120 and the guide panel 130 are stacked on the support main 114. The plate bottom 120 and the guide panel due to the tolerance of the plate bottom 120 and the guide panel 130 are inserted into the protrusion 122 having a “∩” shape formed on the second horizontal surface of the bottom 120. 130, the gap Gap is eliminated.

Therefore, the liquid crystal display according to the first exemplary embodiment of the present invention blocks foreign substances introduced from the outside through the gap between the plate bottom 120 and the guide panel 130. Thus, the liquid crystal display according to the first embodiment of the present invention prevents the deterioration of the image quality due to the foreign matter introduced into the liquid crystal display.

Referring to FIG. 3, the liquid crystal display according to the second exemplary embodiment of the present invention includes protrusions formed on the plate bottom 220 among the components of the liquid crystal display according to the first exemplary embodiment of the present invention illustrated in FIG. 2. Since it is the same as each of the other components except for 222, the description of the other components will be omitted below.

In the liquid crystal display according to the second exemplary embodiment of the present invention, the plate bottom 220 is a press of aluminum and emits heat generated from the backlight unit and serves as a ground of the liquid crystal display module.

To this end, the plate bottom 220 is bent vertically upward from the first horizontal plane and the first horizontal plane disposed between the reflective sheet 212 and the support main 214 between the side surface of the backlight unit and the step surface of the support main. A first horizontal plane bent horizontally from the first vertical plane and a second horizontal plane disposed between the guide panel 230 and an upper surface of the support main 214 and vertically bent downward from the second horizontal plane to support the main main ( 214 and a second vertical surface surrounding the side surface. In addition, the second vertical surface is connected to the case top 202 to ground the plate bottom 220.

The protrusion 222 of the plate bottom 220 protrudes in a square shape from the second horizontal plane so as to be inserted into and formed into the groove 232 of the guide panel 230.

As such, the guide panel 230 is stacked on the plate bottom 220. In this case, the groove 232 formed on the rear surface of the guide panel 230 is inserted into the rectangular protrusion 222 formed on the second horizontal surface of the plate bottom 220 and then molded.

In the liquid crystal display according to the second exemplary embodiment of the present invention, the groove 232 formed on the rear surface of the guide panel 230 when the plate bottom 220 and the guide panel 230 are stacked on the support main 214 is plated. Since it is inserted into the rectangular protrusion 222 formed on the second horizontal surface of the bottom 220 and is joined, the plate bottom 220 and the guide panel 230 due to the tolerance of the plate bottom 220 and the guide panel 230 are formed. This eliminates the gap.

Therefore, the liquid crystal display according to the second exemplary embodiment of the present invention blocks foreign substances introduced from the outside through the gap between the plate bottom 220 and the guide panel 230. Thus, the liquid crystal display according to the second exemplary embodiment of the present invention prevents deterioration in image quality due to foreign substances introduced into the liquid crystal display.

Referring to FIG. 4, in the liquid crystal display according to the third exemplary embodiment of the present invention, grooves formed in the plate bottom 320 among the components of the liquid crystal display according to the first exemplary embodiment of the present invention shown in FIG. 2. Since the components 322 and the protrusion 332 formed on the panel guide 330 are the same as each other component, the description of the other components will be omitted below.

In the liquid crystal display according to the third exemplary embodiment of the present invention, the guide panel 330 is mounted on the support main 314 as a mold, and a stepped portion on which the liquid crystal panel 306 is mounted is provided. The liquid crystal panel 306 is seated on the front surface of the stepped portion, and the rear surface presses a plurality of optical sheets 308 stacked on the light guide plate 310. In addition, a plurality of protrusions 232 are formed on the rear surface of the guide panel 330 to protrude to face the upper surface of the support main 314.

The plate bottom 320 is a press made of aluminum and emits heat generated from the backlight unit and serves as a ground of the liquid crystal display module. To this end, the plate bottom 320 is bent vertically upward from the first horizontal plane disposed between the reflective sheet 312 and the support main 314 and between the side surface of the backlight unit and the step surface of the support main. Bent horizontally from the first vertical plane disposed in the first vertical plane, and vertically bent downward from the second horizontal plane and the second horizontal plane disposed between the guide panel 330 and the upper surface of the support main 314 to support the main main ( 314 and a second vertical surface surrounding the side. In the second horizontal surface of the plate bottom 320, a plurality of grooves 322 are formed to be inserted into each of the plurality of protrusions 332 formed on the rear surface of the guide panel 330. In addition, the second vertical surface is connected to the case top 302 to ground the plate bottom 320.

As such, the guide panel 330 is stacked on the plate bottom 320. At this time, the plurality of protrusions 332 formed on the rear surface of the guide panel 330 is inserted into the plurality of grooves 322 formed on the second horizontal surface of the plate bottom 320 to be molded.

The liquid crystal display according to the third exemplary embodiment of the present invention has a plurality of protrusions 332 formed on the rear surface of the guide panel 330 when the plate bottom 320 and the guide panel 330 are stacked on the support main 314. And the plate bottom 320 and the guide panel 330 due to the tolerance between the plate bottom 320 and the guide panel 330 because they are inserted into the plurality of grooves 322 formed in the second horizontal plane of the plate bottom 320. The gap is eliminated in between.

Therefore, the liquid crystal display according to the third exemplary embodiment of the present invention blocks foreign substances introduced from the outside through the gap between the plate bottom 320 and the guide panel 330. Thus, the liquid crystal display according to the third exemplary embodiment of the present invention prevents deterioration in image quality due to foreign substances introduced into the liquid crystal display.

As described above, the liquid crystal display according to the exemplary embodiment of the present invention forms grooves / projections on the rear surface of the guide panel, and grooves or protrusions formed on the guide panel are inserted on the plate bottom to form protrusions / grooves to be joined. do. This eliminates the gap between them when forming parts between the guide panel and the plate bottom. Therefore, the liquid crystal display according to the embodiment of the present invention can prevent the poor image quality due to the foreign matter introduced into the inside by blocking the foreign matter introduced from the outside. In addition, the liquid crystal display according to the exemplary embodiment of the present invention eliminates the need for additional materials such as a double-sided tape or pads for eliminating the gap between the guide panel and the plate bottom as in the prior art, thereby reducing cost and productivity.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims.

Claims (5)

Support main section, A liquid crystal panel laminated on the support main; A panel guide laminated on the support main and supporting the liquid crystal panel and having an uneven surface; And a plate bottom disposed between the support main and the panel guide and having a concave-convex surface that is joined to the concave-convex surface of the panel guide. The method of claim 1, A backlight unit stacked between the support main and the liquid crystal panel; And a case top surrounding the edge of the liquid crystal panel and the side surface of the support main. The method of claim 2, The plate bottom, A first horizontal plane disposed on the backlight unit and the support main; A first vertical plane bent vertically upward from the first horizontal plane, A second horizontal plane which is bent horizontally from the first vertical plane and the uneven surface is formed; And a second vertical surface that is bent vertically downward from the second horizontal surface. The method of claim 3, wherein And the second vertical surface of the plate bottom is connected to the case top to ground the plate bottom. The method of claim 1, And the concave-convex surface formed on the bottom of the plate is curved in a “∩” shape.