KR20100052166A - Liquid crystal display device - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, and more particularly, to a reflector that does not come into contact with the support main even when a flow occurs.

The present invention constitutes a protrusion having a predetermined shape at both ends in the longitudinal direction of the four edges of the reflector, and the edge of the support main and the edge of the reflector are formed to have a gap spaced apart by a predetermined interval, and the edge of the support main corresponding to the protrusion of the reflector. It is characterized by forming a groove on the back of the inner surface.

As a result, when the reflecting plate flows, the reflecting plate and the support main do not come into contact with each other, thereby preventing the lifting of the reflecting plate and the lifting of the reflecting plate.

As a result, spots may be prevented from appearing on the LCD screen due to the difference in luminance generated in the areas where the dents of the reflecting plate are generated, the display areas overlapping the display areas, and the areas where the dents are not generated, and the display areas overlapping. .

Description

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 reflector that does not come into contact with the support main even when a flow occurs.

In line with the recent information age, the display field has also been rapidly developed, and a liquid crystal display device (FPD) is a flat panel display device (FPD) having advantages of thinning, light weight, and low power consumption. LCD, plasma display panel device (PDP), electroluminescence display device (ELD), field emission display device (FED), etc. : It is rapidly replacing CRT.

Among them, LCDs are excellent in moving image display and are most actively used in notebooks, monitors, TVs, etc. due to high contrast ratio. The LCDs are devices that do not have their own light emitting elements. It requires a light source.

As a result, a backlight unit having a lamp is provided on the rear side to irradiate light toward the front of the liquid crystal panel, thereby realizing an image of identifiable luminance.

On the other hand, a cold cathode fluorescent lamp (Cold Cathode Fluoresent Lamp), an external electrode fluorescent lamp (External Electrode Fluoresent Lamp), and a light emitting diode (LED) are used as the light source of the backlight unit.

Among them, LEDs are particularly widely used as display light sources having features such as small size, low power consumption, and high reliability.

1 is a cross-sectional view of a general liquid crystal display module using LED as a light source, and FIG. 2 is an enlarged cross-sectional view of region A of FIG. 1.

As illustrated, a general liquid crystal display module includes a liquid crystal panel 10, a backlight unit 20, a support main 30, a cover bottom 50, and a top cover 40.

The liquid crystal panel 10 is a part that plays a key role in image expression and is composed of first and second substrates 12 and 14 bonded to each other with a liquid crystal layer interposed therebetween. The printed circuit board 17 is connected to one side edge of the liquid crystal panel 10 through the connection member 15.

In addition, the backlight unit 20 is provided behind the liquid crystal panel 10.

In this case, the backlight unit 20 includes an LED assembly 29 arranged along at least one edge length direction of the support main 30, a white or silver reflecting plate 25 mounted on the cover bottom 50, and the like. The light guide plate 23 mounted on the reflective plate 25 and a plurality of optical sheets 21 interposed thereon are included.

In addition, the light shielding tape 26 may further include a light shielding tape 26 between the plurality of optical sheets 21 and the liquid crystal panel 10 to prevent light from leaking to portions outside the screen display area of the liquid crystal panel 10.

The LED assembly 29 is configured at one side of the light guide plate 23, and includes a plurality of LEDs 29a emitting light and a flexible printed circuit board (FPCB) 29b on which the LEDs 29a are mounted.

Accordingly, the light emitted from the LED 29a is incident on the light incident part of the light guide plate 23 and then refracted toward the liquid crystal panel 10 therein, and the optical sheet 21 together with the light reflected by the reflector 25 is used. During the passage), it is processed into a more uniform surface light source of high quality and is supplied to the liquid crystal panel 10.

The liquid crystal panel 10 and the backlight unit 20 have a top cover 40 surrounding the top edge of the liquid crystal panel 10 and a back surface of the backlight unit 20 in a state where the edges are surrounded by the support main 30 having a rectangular frame shape. Cover cover 50 to cover each is coupled to the front and rear and is integrated and modularized via the support main 30 as a medium.

Meanwhile, in order to reflect the light exiting to the lower surface of the light guide plate 23, the reflector 25 positioned below the light guide plate 23 is modularized without a separate fixing structure.

As a result, a flow of the reflector 25 is generated during a drop test in which the modular liquid crystal display is transported or dropped in various directions at a predetermined height, and the reflector 25 is formed in the backlight unit 20 during the flow. It comes in contact with the support main 30 around the edge.

As a result, the phenomenon of lifting of the reflecting plate 25 is generated, which causes the shrinkage phenomenon of the reflecting plate 25 to cry.

As such, when the hum of the reflecting plate 25 is generated, a difference in luminance occurs in the region where the hum is generated, the display area overlapping with it, and the area where the hum is not generated, and the display area overlapping with the same. Due to this luminance difference, spots appear on the LCD screen.

The present invention has been made to solve the above problems, and a first object of the present invention is to prevent the flow of the reflecting plate of the liquid crystal display device.

Through this, the second object is to implement a more uniform surface light source by removing the luminance non-uniformity phenomenon by preventing the occurrence of the hum phenomenon of the reflecting plate.

In order to achieve the object as described above, the present invention includes a cover bottom is bent edge upward; A reflection plate seated on the cover bottom and having protrusions formed at both ends in the longitudinal direction of the four edges; A light source positioned on the reflector; A plurality of optical sheets interposed on the light source; A support main covering edges of the reflective plate, the light guide plate, and the plurality of optical sheets, and including a groove corresponding to the protrusion on a rear surface of the edge inner surface; A liquid crystal panel positioned on the plurality of optical sheets, the liquid crystal panel comprising first and second substrates bonded to each other with a liquid crystal layer interposed therebetween; And a top cover that covers the top edge of the liquid crystal panel and is coupled to the support main and the cover bottom, and the protrusion does not contact the groove.

The edge of the reflector and the edge of the support main is characterized in that it has a gap (gap) spaced apart by a predetermined interval, the gap is characterized in that 0.3mm ~ 0.5mm.

The gap formed between the protrusion of the reflector and the edge of the cover bottom is 0.2 to 0.25 mm smaller than the gap formed between the edge of the support main and the edge of the reflector. And a light blocking tape between the plurality of optical sheets and the liquid crystal panel.

The light source may be a selected one of a fluorescent lamp and a light-emitting diode lamp. The light source may further include a light guide plate between the reflective plate and the plurality of optical sheets, wherein the light source is one side of the light guide plate. It is characterized in that located in.

In addition, the light source is characterized in that a plurality is provided.

As described above, according to the present invention, a protrusion having a predetermined shape is formed at both ends in the longitudinal direction of the four edges of the reflecting plate, and the edge of the support main and the edge of the reflecting plate are formed to have a gap spaced apart by a predetermined interval, and the protrusion of the reflecting plate. By forming a groove on the rear surface of the inner side of the edge of the support main corresponding to the, there is an effect that the reflecting plate and the support main do not come into contact with each other when the reflecting plate flows.

As a result, it is possible to prevent the floating phenomenon of the reflecting plate and the rising of the reflecting plate, and to prevent the phenomenon of appearing on the LCD screen due to the luminance difference generated in the display area.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

3 is an exploded perspective view of a liquid crystal display module according to an exemplary embodiment of the present invention.

As illustrated, the liquid crystal display module includes a liquid crystal panel 110, a backlight unit 120, a support main 130, a cover bottom 150, and a top cover 140.

First, the liquid crystal panel 110 plays a key role in image expression and includes a first substrate 112 and a second substrate 114 bonded to each other with the liquid crystal layer interposed therebetween.

At this time, although not shown in the drawings under the premise of an active matrix method, a plurality of gate lines and data lines intersect each other and a pixel is defined on an inner surface of the first substrate 112, which is commonly referred to as a lower substrate or an array substrate. Thin film transistors (TFTs) are provided at the intersections of the transistors and are in one-to-one correspondence with transparent pixel electrodes formed in each pixel.

In addition, the inner surface of the second substrate 114 called the upper substrate or the color filter substrate may correspond to each pixel, for example, a color filter of red (R), green (G), and blue (B) color, and each of them. A black matrix covering the non-display elements such as gate lines, data lines, and thin film transistors is provided. In addition, a transparent common electrode covering them is provided.

A polarizer (not shown) for selectively transmitting only specific light is attached to the outer surfaces of the first and second substrates 112 and 114, respectively.

In addition, the printed circuit board 117 is connected to at least one edge of the liquid crystal panel 110 through a connection member 116 such as a flexible circuit board or a tape carrier package (TCP) to support the modularization process. The side surface of the main 130 or the cover bottom 150 is properly folded to be in close contact.

Accordingly, in the liquid crystal panel 110 having the above-described structure, when the thin film transistor selected for each gate line is turned on by the on / off signal of the gate driver circuit which is scanned and transmitted, the signal voltage of the data driver circuit is applied to the corresponding pixel through the data line. The direction of the liquid crystal molecules is changed by the electric field between the pixel electrode and the common electrode.

In addition, the liquid crystal display module according to the present invention is provided with a backlight unit 120 for supplying light from the rear surface of the liquid crystal panel 110 so that the difference in transmittance is expressed to the outside.

The backlight unit 120 may include an LED assembly 129, a white or silver reflector 200, a light guide plate 123 mounted on the reflector 200, and a plurality of optical sheets 121 interposed thereon. Include.

The light shielding tape 126 may further include a light shielding tape 126 between the plurality of optical sheets 121 and the liquid crystal panel 110 to prevent light from leaking to portions outside the screen display area of the liquid crystal panel 110.

The LED assembly 129 described above is positioned at one side of the light guide plate 123 so as to face the light incident part of the light guide plate 123, and the LED assembly 129 has a plurality of LEDs 129a and LEDs 129a of which are spaced apart from each other. It includes an FPCB (129b) spaced apart.

In this case, the plurality of LEDs 129a emits light having red (R), green (G), and blue (B) colors toward the light-receiving portion of the light guide plate 123, respectively, and the plurality of RGB LEDs (129a). ) Can be lit at once to realize white light by color mixing.

At this time, by using the LED 129a configured with an LED chip (not shown) that emits all the colors of RGB, the white light may be implemented in each LED 129a, or a chip that emits complete white including a chip emitting white. LED 129a may be used.

Meanwhile, a plurality of LEDs 129a emitting RGB light may be bundled and mounted in a cluster, and a plurality of LEDs 129a mounted on the FPCB 129b may be arranged on the FPCB 129b. It is also possible to arrange them side by side or to arrange them side by side in a plurality of columns.

The light guide plate 123 evenly spreads the light incident from the plurality of LEDs 129a to a wide area of the light guide plate 123 while propagating through the light guide plate 123 by a plurality of total reflections to provide a surface light source to the liquid crystal panel 110. do.

The light guide plate 123 may include a pattern of a specific shape on the rear surface to supply a uniform surface light source.

The plurality of optical sheets 121 on the light guide plate 123 include a diffusion sheet and at least one light collecting sheet, and diffuse or condense the light passing through the light guide plate 123 to provide a more uniform surface to the liquid crystal panel 110. Allow the light source to enter.

The reflector 200 is positioned on the rear surface of the light guide plate 123, and reflects light passing through the rear surface of the light guide plate 123 toward the liquid crystal panel 110 to improve the brightness of the light.

In particular, the reflective plate 200 is characterized in that the protrusion 210 of a predetermined shape is provided at both ends in the longitudinal direction of the four edges of the reflective plate 200.

As a result, the reflector 200 does not come into contact with the support main 130 even when the modular liquid crystal display device is transported or dropped in a plurality of directions at a predetermined height. We will discuss this in more detail later.

Meanwhile, one edge of the reflector 200 corresponding to the LED assembly 129 may include a plurality of protrusions (not shown) corresponding to the plurality of LEDs 129a of the LED assembly 129.

The liquid crystal panel 110 and the backlight unit 120 are modularized through the top cover 140, the support main 130, and the cover bottom 150. The top cover 140 is the top and side surfaces of the liquid crystal panel 110. A rectangular frame having a cross section bent in a shape of “a” so as to cover an edge thereof is configured to open an entire surface of the top cover 140 to display an image implemented in the liquid crystal panel 110.

In addition, the cover bottom 150 on which the liquid crystal panel 110 and the backlight unit 120 are seated, and which is the basis for assembling the entire structure of the liquid crystal display device, is formed in a rectangular plate shape and vertically bent at four edges thereof. do.

In addition, the support main 130 having a rectangular frame shape seated on the cover bottom 150 and surrounding the edges of the liquid crystal panel 110 and the backlight unit 120 is coupled to the top cover 140 and the cover bottom 150. do.

Here, a groove (not shown) is formed at a position corresponding to the protrusion 210 of the reflection plate 200 on the rear surface of the inner surface of the edge of the support main 130, that is, the surface contacting the cover bottom 150, and the reflection plate 200. ), So that the protrusion 210 and the support main 130 do not contact each other.

In this case, the top cover 140 may also be referred to as a case top or a top case, and the support main 130 may also be referred to as a guide panel, a main support, or a mold frame, and the cover bottom 150 may be referred to as a bottom cover or a lower cover. It is also built.

Here, the process of modularizing the above-described liquid crystal display device will be briefly described. First, the reflective plate 200 and the light guide plate 123 are sequentially seated on the cover bottom 150, and then the cover bottom 150 and the support main 130 are disposed. ).

Next, the LED assembly 129 is attached and fixed so that the light emitted from the LED 129a is faced with the light incident part of the light guide plate 123 through a bonding method or the like.

Next, the light shielding tape 126 and the plurality of optical sheets 121 are interposed on the light guide plate 123, and the top cover 140 is covered with the top cover 140 after the liquid crystal panel 110 is seated thereon. And assembling and fastening with the support main 130 to complete the modularization process of the liquid crystal display device.

4 is a plan view schematically illustrating a structure of a reflector of the present invention and a state in which the reflector is interposed on a cover bottom.

As shown, the reflector plate 200 is interposed on the cover bottom 150, the projecting portion 210 of the predetermined shape is formed at both ends of the longitudinal direction of the four edges.

In this case, the protrusion 210 of the reflective plate 200 preferably has a first gap d1 spaced apart from the four edges of the cover bottom 150 by a predetermined distance, which covers the reflective plate 200. It is for the convenience of the process interposed on 150.

That is, a process of interposing the reflective plate 200 on the cover bottom 150 having four edges bent upward is performed by a worker's hand. The reflective plate 200 may be formed to be in close contact with the four edges of the cover bottom 150. In this case, the process of the operator interposing the reflective plate 200 on the cover bottom 150 brings inconvenience.

In addition, this may cause wrinkles or the like of the reflective plate 200, which causes the display performance of the liquid crystal display to be degraded.

Thus, the present invention is formed to have a first gap d1 between the four edges of the cover bottom 150 and the protrusion 210 of the reflecting plate 200, thereby interposing the reflecting plate 200 on the cover bottom 150. At this time, the assembly gap is caused by the first gap d1, thereby bringing about a process convenience.

As for the 1st gap d1, 0.1-0.25 mm is suitable.

As a result, the reflecting plate 200 is caused to flow by the first gap d1 during a drop test in which the modular liquid crystal display device is transported or dropped in various directions at a constant height.

However, the reflector 200 of the present invention does not come into contact with the support main (130 of FIG. 3) even when the flow is generated, thereby preventing the lifting of the reflector 200 and the lifting of the reflector 200. Done.

As a result, spots may appear on the LCD screen due to a difference in luminance generated in an area where the chamfer of the reflector 200 is generated, a display area that overlaps with the display area, and an area where the chamfer does not occur, and a display area that overlaps the same. Will be prevented. This will be described in more detail with reference to FIGS. 5A to 5B.

FIG. 5A is a plan view illustrating the relationship between the reflector and the support main of the present invention, and schematically illustrates a state in which the cover bottom and the support main are fastened.

As shown in the drawing, the reflector plate 200 having a protrusion 210 having a predetermined shape formed on both ends of the four edges in the longitudinal direction of the cover bottom 150 is spaced apart from the four edges of the cover bottom 150 by a predetermined distance. It is interposed to have a gap d1, and the reflecting plate 200 is surrounded by an edge of the support main 130 assembled with the cover bottom 150.

At this time, between the four edges of the reflector 200 and the edge of the support main 130 has a second gap d2 spaced apart by a predetermined interval, the second gap d2 is preferably 0.3 ~ 0.5mm.

As a result, even when the reflecting plate 200 flows, the reflecting plate 200 does not come into contact with the support main 130.

In more detail, the reflective plate 200 in which the protrusion 210 has the first gap d1 spaced apart from the four edges of the cover bottom 150 by a predetermined distance may be used to transport a modular liquid crystal display or a predetermined height. Flows occur during drop tests that drop in multiple directions.

The protrusion 210 of the reflective plate 200 may be in close contact with one edge of the cover bottom 150.

However, since the first gap d1 between the protrusion 210 of the reflective plate 200 and one edge of the cover bottom 150 is 0.1 mm to 0.25 mm, the protrusion 210 of the reflective plate 200 is covered by the cover bottom 150. Even if it is in close contact with one edge of the support main 130 and the reflecting plate 200 is not in contact with each other by the second gap (d2) of 0.3 ~ 0.5mm of the edge of the reflecting plate 200 and the edge of the support main 130. .

That is, even if the protrusion 210 of the reflective plate 200 is in close contact with one edge of the cover bottom 150 and the reflecting plate 200 flows from 0.1 mm to 0.25 mm to one edge of the cover bottom 150, the support main 130 is supported. The edge of the edge and the edge of the reflector 200 is to maintain a gap of 0.2mm ~ 0.25mm.

On the other hand, the support main 130 is not in contact with the protrusion 210 protruding in a predetermined shape at both ends of the four edges of the four sides of the reflective plate 200, which is due to the groove formed in the support main 130 This will be described in more detail with reference to FIG. 5B.

5B is an enlarged perspective view of a portion of FIG. 5A.

As shown in the drawing, the cover plate 150 is provided with reflecting plates 200 having protrusions 210 of a predetermined shape formed at both ends in the longitudinal direction of the four edges, and the reflecting plate 200 is assembled with the cover bottoms 150. The edge is surrounded by the fastened support main 130.

At this time, a second gap d2 of 0.3 to 0.5 mm is formed between the four edges of the reflector 200 and the support main 130, so that the reflector 200 and the support main ( 130) is not in contact.

In addition, a groove 135 is formed on the rear surface of the inner surface of the edge of the support main 130, that is, the surface contacting the cover bottom 150 of the edge of the support main 130, and the groove 135 is a reflecting plate 200. It is formed at a position corresponding to the protrusion 210 of the.

The length or width of the groove 135 is configured in proportion to the length and width of the protrusion 210 of the reflector 200, and the groove 135 has a wider width than the width of the protrusion 210 of the reflector 200. It is preferable to have, and the height of the groove 135 is preferably higher than the thickness of the protrusion 210 of the reflecting plate 200.

As a result, the protrusion 210 of the reflector 200 does not come into contact with the support main 130.

6A through 6B are cross-sectional views schematically illustrating some aspects of the modular liquid crystal display of FIG. 3. FIG. 6A illustrates a portion in which the protrusion of the reflector is not formed, and FIG. 6B illustrates a portion in which the protrusion of the reflector is formed.

As shown in the drawing, the reflective plate 200, the light guide plate 123, and the lamps (not shown) provided on one side of the light guide plate 123 are provided at both ends in the longitudinal direction of the four edges. A plurality of optical sheets 121 are stacked on the light guide plate 123 to form a backlight unit.

In addition, the liquid crystal panel 110 in which the liquid crystal layer is interposed between the first and second substrates 112 and 114 and the backlight unit is disposed thereon.

The backlight unit and the liquid crystal panel 110 are surrounded by edges by the support main 130, and the cover bottom 150 is coupled to the rear surface of the backlight unit and the liquid crystal panel 110, and the top case 140 covering the upper edge and side surfaces of the liquid crystal panel 110. Is coupled to the support main 130 and cover bottom 150.

In this case, a light blocking tape 126 is attached between the plurality of optical sheets 121 and the liquid crystal panel 110.

Here, as described above, the reflecting plate 200 is provided with a protrusion 210 having a predetermined shape at both ends of the four edges of the reflecting plate 200 in the longitudinal direction, and the reflecting plate 200 is formed on the rear surface of the inner edge of the support main 130. The groove 135 is formed at a position corresponding to the protrusion 210 of the.

Therefore, as shown in FIG. 6A, the portion of the reflective plate 200 in which the protrusion 210 is not provided has an edge of the reflective plate 200 with the support main 130 and the second gap d2 of 0.3 mm to 0.5 mm. As shown in FIG. 6B, the protrusion 210 of the reflector 200 may cover the cover bottom 150 with a first gap of 0.1 mm to 0.25 mm, as shown in FIG. 6B. It is located at (d1).

In this case, the protrusion 210 of the reflector 200 does not contact the support main 130 by the groove 135 formed in the support main 130.

Thus, the reflective plate 200 does not come into contact with the support main 130 even when a flow occurs during a drop test in which the modular liquid crystal display device is transported or dropped in various directions at a predetermined height.

Thus, the lifting phenomenon of the reflector 200 and the lifting of the reflector 200 may be prevented from occurring.

As a result, spots may appear on the LCD screen due to a difference in luminance generated in an area where the chamfer of the reflector 200 is generated, a display area that overlaps with the display area, and an area where the chamfer does not occur, and a display area that overlaps the same. Will be prevented.

In this case, the backlight unit having the above-described structure is generally called a side light method, and depending on the purpose, the LED assembly (129 of FIG. 3) may be configured along the inner longitudinal direction of both edges of the support main 130 facing each other. Although not shown in a separate drawing, it is also possible to use a direct backlight unit.

In this case, a plurality of LED assemblies (129 of FIG. 3) are arranged side by side with the light guide plate (123 of FIG. 3) omitted in the above-described structure, and a plurality of optical sheets (121 of FIG. 3) may be interposed therebetween. Can be.

In addition to the LED (129a in FIG. 3), a fluorescent lamp such as a cold cathode fluorescent lamp or an external electrode fluorescent lamp may be used.

The present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit of the present invention.

1 is a cross-sectional view of a general liquid crystal display module using an LED as a light source.

FIG. 2 is an enlarged cross-sectional view of region A of FIG. 1.

3 is an exploded perspective view illustrating a liquid crystal display device according to an exemplary embodiment of the present invention.

4 is a plan view schematically showing the structure of the reflecting plate of the present invention and the appearance of the reflecting plate interposed on the cover bottom.

5A is a plan view for explaining a relationship between a reflector and a support main body of the present invention;

FIG. 5B is an enlarged perspective view of a portion of FIG. 5A; FIG.

6A to 6B are cross-sectional views schematically illustrating some aspects of the modular liquid crystal display of FIG. 3.

Claims (8)

A cover bottom whose edge is bent upwardly; A reflection plate seated on the cover bottom and having protrusions formed at both ends in the longitudinal direction of the four edges; A light source positioned on the reflector; A plurality of optical sheets interposed on the light source; A support main covering edges of the reflective plate, the light guide plate, and the plurality of optical sheets, and including a groove corresponding to the protrusion on a rear surface of the edge inner surface; A liquid crystal panel positioned on the plurality of optical sheets, the liquid crystal panel comprising first and second substrates bonded to each other with a liquid crystal layer interposed therebetween; A top cover that covers an upper edge of the liquid crystal panel and is coupled to the support main and the cover bottom And the protrusion is not in contact with the groove. The method of claim 1, And an edge of the reflective plate and an edge of the support main have a gap spaced apart from each other by a predetermined distance. The method of claim 2, The gap (gap) is a liquid crystal display, characterized in that 0.3mm ~ 0.5mm. The method of claim 3, wherein The gap formed between the protrusion of the reflector and the edge of the cover bottom is 0.2 to 0.25 mm smaller than the gap formed between the edge of the support main and the edge of the reflector. Device. The method of claim 1, And a light shielding tape between the plurality of optical sheets and the liquid crystal panel. The method of claim 1, Wherein the light source is one selected from a fluorescent lamp and a light-emitting diode lamp. The method of claim 6, And a light guide plate between the reflective plate and the plurality of optical sheets, wherein the light source is located at one side of the light guide plate. The method of claim 6, The light source is provided with a plurality of liquid crystal display device.

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