KR102413364B1 - Liquid crystal display device - Google Patents

Abstract

The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device in which flow of a plurality of optical sheets of a backlight unit is prevented.
A feature of the present invention is that an optical sheet pressing part is provided on a pad provided to prevent the flow of the light guide plate, and a pad step corresponding to the optical sheet pressing part is provided at one corner of each optical sheet to configure the first optical sheet fixing structure. In addition, a second optical sheet fixing structure is further provided with each tape step at one edge of the optical sheet, and a plurality of optical sheets are respectively attached and fixed to the guide panel through a double-sided adhesive tape by each tape step. will do
Through this, it is possible to prevent the flow of a plurality of optical sheets, and it is possible to prevent deterioration of the display quality of the liquid crystal display device due to the flow of the optical sheets, and also to prevent the occurrence of poor chewing of the optical sheet. Therefore, the efficiency of the process can also be improved.

Description

Liquid crystal display device

The present invention relates to a liquid crystal display, and more particularly, to a liquid crystal display in which flow of a plurality of optical sheets of a backlight unit is prevented.

Liquid crystal display devices (LCDs), which are advantageous for displaying moving images and have a large contrast ratio, are actively used in TVs and monitors, etc. shows the principle of image realization by

Such a liquid crystal display device consists of a liquid crystal panel bonded together with a liquid crystal layer interposed between two side-by-side substrates, and the transmittance difference is realized by changing the arrangement direction of liquid crystal molecules with an electric field in the liquid crystal panel. do.

However, since the liquid crystal panel does not have its own light-emitting element, a separate light source is required to display the difference in transmittance as an image, and for this, a backlight unit with a built-in light source is disposed on the rear surface of the liquid crystal panel.

The backlight unit includes a light source for supplying light, a light guide plate for guiding the light emitted from the light source to the liquid crystal panel, and an optical sheet positioned above the light guide plate to process light uniformly, and the liquid crystal panel and the backlight unit have square edges. In a state surrounded by a frame-shaped guide panel, the case top that surrounds the upper edge of the liquid crystal panel and the cover bottom that covers the back of the backlight unit are combined from the front and rear, respectively, and are integrated.

At this time, the optical sheet is made of at least two or more. The edge of the optical sheet positioned at the top is attached to the guide panel by a light-shielding tape and fixed, but other optical sheets do not have a separate fixing structure, so they are modularized It flows in the liquid crystal display device.

This causes unevenness in the image due to the difference in luminance due to the flow of the optical sheet, which in turn causes a problem of lowering the display quality of the liquid crystal display.

In addition, when the optical sheet flows from a desired position as described above, chewing defects of the optical sheet may occur by the guide panel during the fastening process of the guide panel and the cover bottom. Since the optical sheet with poor chewing quality cannot realize a uniform image, it has to be discarded because it leads to a deterioration in image quality, thereby reducing process efficiency.

The present invention is to solve the above problems, and a first object is to effectively fix the optical sheet.

In addition, the second purpose is to improve the quality of the liquid crystal display device, and the third purpose is to also improve the efficiency of the process.

In order to achieve the object as described above, the present invention provides a liquid crystal panel, a light guide plate positioned below the liquid crystal panel, an LED assembly positioned along a light incident surface of the light guide plate, and a first optical positioned above the light guide plate A sheet, a second optical sheet positioned above the first optical sheet, a first pad step is provided at one corner corresponding to the light-receiving surface, and a first tape step is provided at an edge, and positioned below the light guide plate It provides a liquid crystal display including a reflector, wherein a portion of one corner of the first optical sheet is exposed by the step of the first pad, and a portion of an edge of the first optical sheet is exposed by the step of the first tape .

At this time, the double-sided adhesive tape is positioned above the edge of the second optical sheet, wherein the double-sided adhesive tape has an edge of the first optical sheet exposed by the first tape step and an edge of the second optical sheet. is attached to the light guide plate, and a pad insertion groove is provided corresponding to one corner corresponding to the light carrying surface of the light guide plate, and a pad is inserted into the pad insertion groove.

And, the pad includes an optical sheet fixing part extending from the upper surface, and the optical sheet fixing part is a portion of one corner of the first optical sheet exposed by the first pad step, and one of the second optical sheet All corners are pressed and fixed, and a second pad step is provided at one corner corresponding to the light carrying surface of the first optical sheet, and the second pad step exposes the pad insertion groove.

In addition, the first pad step is larger than the second pad step, so that both the pad insertion groove and one edge of the first optical sheet are exposed by the first pad step, and the first pad step is exposed to the upper portion of the second optical sheet. 3 optical sheets are further positioned, and a third pad step is provided at one corner corresponding to the light-receiving surface, and a second tape step is provided at one edge, and the third pad step is larger than the first pad step, The second tape step is greater than the first tape step.

In addition, the first tape step is located at an edge other than the edge corresponding to the light carrying surface, and a guide panel surrounding the edges of the liquid crystal panel, the light guide plate, the reflection plate, the LED assembly, and the first and second optical sheets. Including, a guide panel step corresponding to the tape step is provided on the rear surface of the horizontal part of the guide panel, and the rear surface of the horizontal part and the guide panel step are attached and fixed to the double-sided adhesive tape.

In addition, the width of the optical sheet fixing portion of the pad, the width of the first tape step, and the width of the horizontal portion are all the same.

As described above, according to the present invention, an optical sheet pressing unit is provided on a pad provided to prevent the light guide plate from flowing, and a pad step corresponding to the optical sheet pressing unit is provided at one corner of each optical sheet to provide the first optical A second optical constituting a sheet fixing structure, further comprising a tape step at one edge of the optical sheet, and attaching and fixing a plurality of optical sheets to the guide panel through a double-sided adhesive tape by each tape step, respectively By configuring the sheet fixing structure, there is an effect that can prevent the flow of a plurality of optical sheets.

Through this, there is an effect that can prevent deterioration of the display quality of the liquid crystal display device due to the flow of the optical sheet, and also it is possible to prevent the occurrence of bad chewing of the optical sheet, so that the efficiency of the process can also be improved. can have an effect.

1 is an exploded perspective view schematically illustrating a liquid crystal display according to an embodiment of the present invention;
Figure 2a is a plan view schematically showing a first optical sheet fixing unit according to an embodiment of the present invention.
Fig. 2b is a schematic perspective view of the pad of Fig. 2a;
Fig. 2c is a cross-sectional view of Fig. 2a;
3A to 3B are perspective cross-sectional views schematically showing a second optical sheet fixing unit according to an embodiment of the present invention.
Figure 3c is a rear perspective view schematically showing the guide panel step of the guide panel.
Figure 4a is a photograph showing a state in which the wrinkle phenomenon is generated by the flow of the optical sheet.
Figure 4b is a photograph showing a state in which the flow of the optical sheet of the liquid crystal display device according to the embodiment of the present invention does not occur.

Hereinafter, an embodiment according to the present invention will be described in detail with reference to the drawings.

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

As shown, the liquid crystal display 100 according to the embodiment of the present invention largely includes a liquid crystal panel 110 , a backlight unit 120 , a guide panel 130 , a case top 140 , and a cover bottom 150 . is composed of

At this time, if the direction in the drawing is defined for convenience of explanation, the backlight unit 120 is disposed at the rear of the liquid crystal panel 110 on the premise that the display surface of the liquid crystal panel 110 faces forward, The case top 140 is positioned in front of the liquid crystal panel 110 with the guide panel 130 in the shape of a square frame wrapped around it, and the cover bottom 150 is positioned on the back side of the backlight unit 120, from the front and rear combined and united

Let's take a closer look at each of these.

First, the liquid crystal panel 110 is a part that plays a key role in image expression of the liquid crystal display device 100 , and is interposed between the first and second substrates 112 and 114 bonded to each other face to face. and a liquid crystal layer (not shown).

Although not shown in the drawing, on the inner surface of the first substrate 112 called a lower substrate or an array substrate, a plurality of gate lines and data lines cross to define a pixel, and at each intersection point, a thin film transistor (thin film transistor) : TFT) is provided and is connected to the transparent pixel electrode formed in each pixel in a one-to-one correspondence.

And on the inner surface of the second substrate 114 called an upper substrate or a color filter substrate, red (R), green (G), and blue (B) color filters as an example corresponding to each pixel and these color filters A black matrix is provided that surrounds each and covers the gate line, the data line, and the thin film transistor.

In addition, red (R), green (G), and blue (B) color filters and a transparent common electrode covering the black matrix are provided.

In addition, upper and lower alignment layers (not shown) that determine the initial molecular arrangement direction of the liquid crystal are interposed at the boundary between the first and second substrates 112 and 114 and the liquid crystal layer (not shown), and the first and second substrates A seal pattern (not shown) is formed along the edges of both substrates 112 and 114 to prevent leakage of the liquid crystal layer (not shown) filled between the 112 and 114 .

In addition, polarizing plates (not shown) that selectively transmit only a specific light are attached to the outer surfaces of the first and second substrates 112 and 114 , respectively.

Along one edge of the liquid crystal panel 110 , the printed circuit board 117 is connected via a connection member 116 such as a flexible circuit board or a tape carrier package (TCP) to guide in the modularization process. It is in close contact with the side surface of the panel 130 or the back surface of the cover bottom 150 .

Accordingly, when the thin film transistor selected for each gate line is turned on by the on/off signal of the thin film transistor scanned and transmitted to the gate line, the liquid crystal panel 110 transmits the image signal of the data line to the corresponding pixel electrode. is transmitted, and the arrangement direction of the liquid crystal molecules is changed by the generated electric field between the pixel electrode and the common electrode, indicating a difference in transmittance.

In addition, the liquid crystal display device 100 according to the present invention is provided with a backlight unit 120 that supplies light from a rear surface thereof so that a difference in transmittance displayed by the liquid crystal panel 110 is expressed to the outside.

The backlight unit 120 includes an LED assembly 129 arranged along at least one edge in the longitudinal direction of the cover bottom 150 , a reflecting plate 125 , a light guide plate 123 mounted on the reflecting plate 125 , and and an optical sheet 220 positioned above the light guide plate 123 .

The LED assembly 129 is a light source of the backlight unit 120 and is located on one side of the light guide plate 123 to face the light incident surface of the light guide plate 123, and the LED assembly 129 includes a plurality of LEDs 129a, A plurality of LEDs (129a) includes a PCB (129b) is mounted spaced apart from each other.

At this time, the plurality of LEDs 129a emit light having red (R), green (G), and blue (B) colors in a forward direction toward the light incident surface of the light guide plate 123 , and these plurality of RGB LEDs 129a ) can be turned on at once to realize white light by color mixing.

In particular, recently, in order to improve luminous efficiency and luminance, a blue LED 129a including a blue LED chip having excellent luminous efficiency and luminance is used, and as a phosphor, 'cerium-doped yttrium aluminum garnet (YAG:Ce)', That is, the blue LED 129a made of a yellow phosphor is used.

The blue light emitted from the LED 129a passes through the phosphor and is mixed with the yellow light emitted by the phosphor, thereby realizing white light.

The light guide plate 123 to which the light emitted from the plurality of LEDs 129a is incident is uniformly spread over a wide area of the light guide plate 123 while the light incident from the LEDs 129a travels through the light guide plate 123 by total reflection several times. Spread to provide a surface light source to the liquid crystal panel (110).

The light guide plate 123 may include a pattern having a specific shape on its lower surface to supply a uniform surface light source. Here, the pattern may be variously configured, such as an elliptical pattern, a polygonal pattern, a hologram pattern, etc., to guide the light incident into the light guide plate 123 . The pattern is formed on the lower surface of the light guide plate 123 by a printing method or an injection method.

At this time, a pad insertion groove 123a is provided at one corner of the light receiving surface opposite to the light receiving surface on which the LED assembly 129 of the light guide plate 123 is located, and the light guide plate 123 flows in the pad insertion groove 123a. A pad 210 for preventing it is positioned.

The pad 210 is made of an elastic material and is inserted into the pad insertion groove 123a in a compressed state, and the light guide plate 123 is pushed and fixed with an elastic force to be restored, thereby preventing the light guide plate 123 from flowing.

In particular, the pad 210 according to the embodiment of the present invention further includes an optical sheet pressing part 213, and the optical sheet pressing part 213 is provided with pad steps 213a, 213b, 213c, see FIG. 2b). , is fixed by pressing in contact with all of the plurality of optical sheets 220, respectively.

The reflecting plate 125 is located on the rear surface of the light guide plate 123 , and reflects the light passing through the rear surface of the light guide plate 123 toward the liquid crystal panel 110 to improve the luminance of the light.

The optical sheet 220 on the light guide plate 123 is provided in a plurality of at least two or more, including a diffusion sheet and a light collecting sheet. In the present invention, the first to third optical sheets 221a, 221b, 221c will be defined. .

The first to third optical sheets 221a, 221b, and 221c diffuse or condense the light passing through the light guide plate 123 so that a more uniform surface light source is incident on the liquid crystal panel 110 .

At this time, pad steps 223a, 223b, 223c are provided at one edge of the first to third optical sheets 221a, 221b, and 221c corresponding to the pad insertion grooves 123a of the light guide plate 123, respectively. A first optical sheet fixing structure of 220 is formed.

That is, the optical sheet pressing portion 213 of the pad 210 is in contact with all of the first to third optical sheets 221a, 221b, and 221c through the pad steps 223a, 223b, 223c, and the first to third The optical sheets 221a, 221b, and 221c are all pressed and fixed.

In addition, a tape step 225 is provided along at least one edge of the first to third optical sheets 221a, 221b, and 221c, and the plurality of optical sheets 220 are double-sided through the tape step 225 . The adhesive tape 230 (refer to FIG. 3A ) and both are attached to each other to be fixed, thereby forming a second optical sheet fixing structure of the optical sheet 220 .

Accordingly, in the liquid crystal display 100 according to the embodiment of the present invention, the plurality of optical sheets 200 are prevented from flowing over the second time through the first and second optical sheet fixing structures.

Through this, in the liquid crystal display device 100 according to the embodiment of the present invention, all of the plurality of optical sheets 220 are prevented from flowing, so that the display quality of the liquid crystal display device 100 due to the flow of the optical sheet 220 is improved. It is possible to prevent deterioration, and also it is possible to prevent the occurrence of bad chewing of the optical sheet 220 , thereby improving the efficiency of the process. We will look at this in more detail later.

The liquid crystal panel 110 and the backlight unit 120 are modularized through the case top 140 , the guide panel 130 , and the cover bottom 150 , and the case top 140 is the upper edge of the liquid crystal panel 110 and Constructed to cover the sides.

Here, the case top 140 has a rectangular frame shape in which a cross section is bent in an “a” shape to cover the upper surface and side edges of the liquid crystal panel 110 , and the first vertical part 141 covering the side surface of the liquid crystal panel 110 . ) and a first horizontal portion 143 covering the upper surface edge of the liquid crystal panel 110 vertically from the first vertical portion 141 , which is implemented in the liquid crystal panel 110 by opening the front surface of the case top 140 . configured to display an image.

The guide panel 130 supports the edge of the liquid crystal panel 110 and has a rectangular frame shape to surround the edge of the backlight unit 120 , and includes a second vertical part 131 surrounding the side surface of the backlight unit 120 and a second A second horizontal part 133 for separating the positions of the liquid crystal panel 110 and the backlight unit 120 is provided inside the vertical part 131 .

The liquid crystal panel 110 is attached and fixed on the second horizontal part 133 through an adhesive pad (not shown) such as a double-sided tape.

At this time, a guide panel step 135 (refer to FIG. 3b) is provided on the rear surface of the second horizontal portion 133 corresponding to the tape step 225 of the optical sheet 220, and the second horizontal portion of the guide panel 130 ( 133) is a tape step of the optical sheet 220 from the upper portion of the double-sided adhesive tape 230 (refer to FIG. 3A) attached to the tape step 225 of the optical sheet 220 through the guide panel step 135, see FIG. 3b. It is fixed by pressing (225).

Through this, the second optical sheet fixing structure prevents the flow of the optical sheet 220 more stably. In particular, it is possible to prevent lifting of the guide panel 130 due to the thickness of the double-sided adhesive tape 230 (refer to FIG. 3A ) positioned above the tape step 225 . We will look at this in more detail later.

And, this guide panel 130 is seated on the cover bottom 150, the cover bottom 150 is composed of a horizontal surface 151 and an edge portion 153 of which the edge of the horizontal surface 151 is vertically bent.

The guide panel 130 , the cover bottom 150 , and the case top 140 cover the upper surface edge of the liquid crystal panel 110 with the guide panel 130 surrounding the edges of the liquid crystal panel 10 and the backlight unit 120 . The case top 140 and the cover bottom 150 covering the back surface of the backlight unit 120 are coupled from the front and rear, respectively, to be integrated into a module through the guide panel 130 .

At this time, the case top 140 is also referred to as a top cover or a top case, the guide panel 130 is also referred to as a support main or main support, or a mold frame, and the cover bottom 150 is also referred to as a bottom cover or a lower cover. also lose

At this time, in the liquid crystal display device 100 having the above-described structure, the case top 140 may be deleted in order to realize a light-weight and thin liquid crystal display device that has been recently requested. By removing the case top 140 , the liquid crystal display 100 can be made lightweight and thin, and has the effect of simplifying the process.

In addition, due to the deletion of the case top 140 made of a metal material, it is possible to reduce the process cost.

The liquid crystal display 100 according to the embodiment of the present invention described above includes an optical sheet pressing unit 213 on a pad 210 provided to prevent the light guide plate 123 from flowing, and each of the optical sheets 220 . A first optical sheet fixing structure is provided by having pad steps 223a, 223b, 223c corresponding to the optical sheet pressing part 213 at one edge of the 225), and a plurality of optical sheets 220 are attached to and fixed to the guide panel 130 through the double-sided adhesive tape 230 (refer to FIG. 3A) by each tape step 225, respectively. By configuring the optical sheet fixing structure, the flow of the plurality of optical sheets 220 is prevented from occurring.

Through this, it is possible to prevent deterioration of the display quality of the liquid crystal display device 100 due to the flow of the optical sheet 220, and also it is possible to prevent the occurrence of bad chewing of the optical sheet 220, The efficiency of the process can also be improved.

2A is a plan view schematically illustrating a first optical sheet fixing unit according to an embodiment of the present invention, and FIG. 2B is a perspective view schematically illustrating the pad of FIG. 2A.

And, FIG. 2C is a cross-sectional view of FIG. 2A.

Prior to the description, FIGS. 2A and 2C are views schematically illustrating one corner at which a pad of the liquid crystal display of FIG. 1 is modularized. In FIG. 2A, for convenience of explanation, a liquid crystal panel, a guide panel, and a case top The configuration is omitted, and in FIG. 2b, the configuration of the case top, the vertical portion of the guide panel, and a part of the side surface of the cover bottom are omitted.

As shown, the reflecting plate 125, the light guide plate 123, and the optical sheet 220 are sequentially disposed on the horizontal surface 151 of the cover bottom 150. At this time, a pad is inserted at one edge of the light guide plate 123. A groove 123a is formed, and a pad 210 made of a translucent material is inserted into the pad insertion groove 123a.

At this time, the pad insertion groove 213a is provided with a locking jaw 123b so that the upper surface 211 of the pad 210 is fixed in a pressed state, and the pad 210 has a larger size than the pad insertion groove 123a. formed to have

Here, the pad 210 is inserted into the pad insertion groove 123a in a compressed state with an elastic material. By pushing the light guide plate 123 , the light guide plate 123 fixes its position in the modular liquid crystal display device ( 100 in FIG. 1 ).

Accordingly, the light guide plate 123 is prevented from flowing in a horizontal or vertical direction due to an external shock or shaking while the light guide plate 123 is accommodated in the cover bottom 150 . Accordingly, it is possible to prevent the plurality of LEDs ( 129a in FIG. 1 ) from being damaged by the flow of the light guide plate 123 .

Here, the pad 210 is provided with an optical sheet pressing unit 213 , the optical sheet pressing unit 213 extends in the longitudinal direction from the upper surface 211 of the pad 210 , and has a plurality of pads on its lower surface. Steps 213a, 213b, and 213c are provided.

The pad steps 213a, 213b, 213c are formed to correspond to the number of optical sheets 220 positioned above the light guide plate 123, and in the present invention, the first to third optical sheets 221a, 221a, As an example will be described where 221b and 221c are positioned, the pad steps 213a, 213b, and 213c also include first to third pad steps 213a, 213b, and 213c.

The first to third pad steps 213a, 213b, and 213c provided in the optical sheet pressing part 213 of the pad 210 are pad steps provided in the first to third optical sheets 221a, 221b, and 221c, respectively. In contact with (223a, 223b, 223c), all of the first to third optical sheets (221a, 221b, 221c) are pressed and fixed.

That is, at one edge of the first to third optical sheets 221a, 221b, and 221c corresponding to one edge of the light guide plate 123 provided with the pad 210, first to third pad steps 223a, 223b, 223c) is provided. The first optical sheet 221a positioned directly above the light guide plate 123 has a pad insertion groove 123a of the light guide plate 123 positioned below the first pad step 223a through the first pad step 223a. will be exposed

In addition, the second pad step 223b of the second optical sheet 221b positioned above the first optical sheet 221a is formed to be larger than the first pad step 223a, and the first optical sheet positioned below the first optical sheet 221a. 221a and the pad insertion groove 123a of the light guide plate 123 are exposed, and the third pad step 223c of the third optical sheet 221c positioned above the second optical sheet 221b is the second pad The first and second optical sheets 221a and 221b positioned below and the pad insertion groove 123a of the light guide plate 123 are exposed to be larger than the step 223b.

At this time, the pad 210 is inserted into the pad insertion groove 123a of the light guide plate 123 , and the first pad step 213a of the optical sheet pressing part 213 is the second of the second optical sheet 221b. The first optical sheet 221a exposed by the pad step 223b is pressed and fixed, and the second pad step 213b is the first optical sheet exposed by the third pad step 223c of the third optical sheet 221c. The second optical sheet 221b is pressed and fixed, and the third pad step 213c is fixed by pressing the third optical sheet 221c.

Accordingly, the first to third optical sheets 221a, 221b, and 221c are primarily prevented from flowing through the pad 210, and the first to third optical sheets 221a, 221b, and 221c have one corner. Flow is prevented in the X-axis direction and the Z-axis direction defined in the drawing.

Here, the width D2 of the first to third pad steps 223a , 223b and 223c of the first to third optical sheets 221a , 221b , 221c corresponds to the width D1 of the pad 210 . Preferably, when the width D1 of the pad 210 is narrower than the width D2 of the first to third pad steps 223a, 223b, 223c, the first to third optical sheets pass through the pad 210. The flow of the optical sheets 221a, 221b, and 221c may be caused due to insufficient force to press the 221a, 221b, and 221c, and the width D1 of the pad 210 may increase the width D1 of the first to third pad steps 223a, When the width D2 of the 223b and 223c is larger than the width D2 , the bezel that is the non-display area by the pad 210 may be widened.

In addition, it is preferable that the width D1 of the pad 210 corresponds to the width D3 of the second horizontal portion 133 of the guide panel 130 to prevent the bezel from being widened by the pad 210 . do.

In addition, the height of the first to third pad steps 213a, 213b, 213c of the pad 210 is made to correspond to the height of the optical sheets 221a, 221b, and 221c, so that the optical sheet pressing part 213 of the pad 210 is formed. and the first to third pad steps 223a, 223b, 223c of the first to third optical sheets 221a, 221b, and 221c are brought into close contact with each other, so that the optical sheet pressing part 213 of the pad 210 and the optical It is desirable to prevent a lifting phenomenon from occurring between the sheets 221a, 221b, and 221c.

3A to 3B are perspective cross-sectional views schematically illustrating a second optical sheet fixing unit according to an embodiment of the present invention, and FIG. 3C is a rear perspective view schematically illustrating a guide panel step of the guide panel.

Prior to the description, FIGS. 3A and 3B are diagrams schematically illustrating one edge of the modularized liquid crystal display of FIG. 1 , and for convenience of explanation, the configuration of the liquid crystal panel and the case top is omitted.

As shown, the back light unit (120 in FIG. 1 ) is seated as an internal storage space defined by the horizontal plane 151 and the edge portion 153 of the cover bottom 150 , and more precisely, the horizontal plane 151 of the cover bottom 150 . ), the reflecting plate 125 , the light guide plate 123 , and the first to third optical sheets 220 are sequentially disposed.

In this case, first and second tape steps 225a and 225b are provided at one edge of the second and third optical sheets 221b and 221c, respectively.

That is, the second optical sheet 221b is provided with a first tape step 225a to expose a portion of an edge of the first optical sheet 221a positioned below the second optical sheet 221b, and the third The optical sheet 221c is provided with a second tape step 225b larger than the first tape step 225a, and a portion of the edge of the second optical sheet 221b positioned below the third optical sheet 221c and , a portion of the edge of the first optical sheet 221a exposed by the first tape step 225a of the second optical sheet 221b is exposed.

A double-sided adhesive tape 230 is positioned above the first and second tape steps 225a and 225b, and the double-sided adhesive tape 230 is a first optical sheet exposed by the first tape step 225a. A part of the edge of the 221a, a part of the edge of the second optical sheet 221b exposed by the second tape step 225b, and a part of the edge of the third optical sheet 221c are all covered and attached.

Accordingly, the first to third optical sheets 221a, 221b, and 221c are all restrained by the double-sided adhesive tape 230, and the first to third optical sheets 221a, 221b, and 221c are double-sided adhesives. Secondary flow is prevented through the tape 230 .

At this time, the first to third optical sheets (221a, 221b, 221c) are prevented from flowing through the second optical sheet fixing part in the X-axis direction, the Y-axis direction, and the Z-axis direction defined in the drawing.

The second horizontal part 133 of the guide panel 130 is seated on the upper part of the second optical sheet fixing part, and the second optical sheet fixing part is more stably pressed and fixed.

That is, a guide panel step 135 protruding downward is provided on the rear surface of the second horizontal portion 133 of the guide panel 130 .

The guide panel step 135 is also formed to correspond to the number of optical sheets 220 positioned on the light guide plate 123, and in the present invention, the first to third optical sheets 221a, 221b, 221c are formed on the upper portion of the light guide plate 123. ) is located, the guide panel step 135 is also composed of the first and second guide panel step (135a, 135b).

The height difference between the first and second guide panel steps 135a and 135b corresponds to the height of the optical sheet 220 .

The guide panel 130 provided with the first and second guide panel steps 135a and 135b corresponds to the second optical sheet fixing part in which the edge of the optical sheet 220 is restrained through the double-sided adhesive tape 230 . By assembling and fastening the cover bottom 150 so as to be possible, the first and second guide panel steps 135a and 135b of the guide panel 130 are fixed by pressing the second optical sheet fixing unit.

That is, the first guide panel step 135a that protrudes downwardly to the rear surface of the second horizontal portion 133 of the guide panel 130 is the first step exposed by the first tape step 225a of the second optical sheet 221b. 1 The optical sheet 221a is brought into close contact with the upper surface of the double-sided adhesive tape 230 attached to the upper portion, and the second guide panel step 135b is on the first tape step 225b of the third optical sheet 221c. It comes into close contact with the upper surface of the double-sided adhesive tape 230 attached to the upper part of the second optical sheet 221b exposed by the is brought into close contact with the rear surface of the second horizontal portion 133 of the guide panel 130 .

As described above, by having the first and second guide panel steps 135a and 135b protruding downwardly to the rear surface of the second horizontal portion 133 of the guide panel 130, the second optical sheet fixing portion is first and second Even if a step is achieved by the tape steps 225a and 225b, all edges of the first to third optical sheets 221a, 221b, and 221c are pressed through the rear surface of the second horizontal portion 133 of the guide panel 130, respectively. can be fixed.

Accordingly, the second optical sheet fixing structure for preventing the flow of the optical sheet 220 is more stably supported through the double-sided adhesive tape 230 , and the flow of the optical sheet 220 can be prevented more stably. .

In particular, due to the tape step 225 , it is possible to prevent lifting between the optical sheet 220 and the guide panel 130 from occurring. Lifting between the optical sheet 220 and the guide panel 130 may cause light from the backlight unit ( 120 in FIG. 1 ) to leak, causing light leakage.

The liquid crystal display device (100 in FIG. 1) according to the embodiment of the present invention includes an optical sheet pressing part (213 in FIG. 2B) on a pad (210 in FIG. 2B) provided to prevent the light guide plate 123 from moving. and comprising a pad step (223a, 223b, 223c in FIG. 2b) corresponding to the optical sheet pressing part (213 in FIG. 2b) at one corner of each optical sheet 220 to configure the first optical sheet fixing structure, A plurality of optical sheets 220 are primarily prevented from flowing in the X-axis direction and the Z-axis direction defined in the drawing, and further provided with a tape step 225 at one edge of the optical sheet 220, respectively, By configuring a second optical sheet fixing structure such that a plurality of optical sheets 220 are respectively attached and fixed to the guide panel 130 through the double-sided adhesive tape 230 by each tape step 225, a plurality of optical The sheet 220 is to prevent secondary flow in both the X-axis direction, the Y-axis direction, and the Z-axis direction defined in the drawing.

That is, the first to third optical sheets 221a, 221b, and 221c according to the embodiment of the present invention are prevented from flowing over the second time through the pad 210 and the double-sided adhesive tape 230, and in particular, As the flow is prevented in all of the X-axis, Y-axis, and Z-axis defined as the image, the flow of the first to third optical sheets 221a , 221b , and 221c is more stably prevented from occurring.

Through this, it is possible to prevent deterioration of the display quality of the liquid crystal display device ( 100 in FIG. 1 ) due to the flow of the optical sheet 220 , and also to prevent the occurrence of bad chewing of the optical sheet 220 . Therefore, the efficiency of the process can also be improved.

Here, FIG. 4A is an experimental result confirming whether the flow of the optical sheet occurs by performing a hand shaking experiment on a general modular liquid crystal display device. Referring to FIG. appearance can be checked.

On the other hand, referring to FIG. 4B , which is an experimental result of confirming whether or not the optical sheet 220 flows by performing a hand-shaking experiment of the liquid crystal display device ( 100 in FIG. 1 ) according to an embodiment of the present invention, the optical sheet 220 ), it can be confirmed that the flow does not occur.

That is, in the liquid crystal display device ( 100 in FIG. 1 ) according to the embodiment of the present invention, the optical sheet pressing part (213 in FIG. 2B ) is provided on the pad (210 in FIG. 2B ) provided to prevent the light guide plate 123 from flowing. and comprising a pad step (223a, 223b, 223c in FIG. 2b) corresponding to the optical sheet pressing part (213 in FIG. 2b) at one corner of each optical sheet 220 to configure the first optical sheet fixing structure, , Also, each of the tape steps 225 is further provided at one edge of the optical sheet 220, and a plurality of optical sheets 220 are respectively guided through the double-sided adhesive tape 230 by each tape step 225. By configuring the second optical sheet fixing structure to be attached and fixed to the 130, the flow of a plurality of optical sheets 220 occurs even when the hand-shaking experiment of the modular liquid crystal display device (100 in FIG. 1) is performed. means not

This means that, in the liquid crystal display ( 100 in FIG. 1 ) according to the embodiment of the present invention, a plurality of optical sheets 220 are stably fixed. It is possible to prevent the display quality of ( 100 in FIG. 1 ) from being deteriorated, and also to prevent the occurrence of bad chewing of the optical sheet 220 , thereby improving the efficiency of the process.

On the other hand, the first optical sheet fixing part is preferably located in the light carrying part of the backlight unit (120 in FIG. 1) to prevent the flow of the light guide plate 123 from occurring, in this case, the second optical sheet fixing part is the first optical sheet The liquid crystal display device (100 in FIG. 1) according to an embodiment of the present invention has the first to third optical sheets by positioning the liquid crystal display device (100 in FIG. 1) at the other edge of the liquid crystal display device (100 in FIG. 1) except for the edge of the light carrying part where the fixing part is located. The flow of the first to third optical sheets 221a , 221b , and 221c may be prevented from occurring more stably by allowing the flow of the 221a , 221b , and 221c to be restricted in at least two directions.

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.

100: liquid crystal display device
110: liquid crystal panel (112, 114: first and second substrates, 116: connection member, 117: printed circuit board)
120: backlight unit (123: light guide plate (123a: pad insertion groove), 125: reflector, 129: LED assembly (129a: LED, 129b: PCB), 200: optical sheets (221a, 221b, 221c: first to third optical sheet, 223a, 223b, 223c: first to third pad steps, 225: tape steps)
130: guide panel (131: second vertical part, 133: second horizontal part)
140: case top (141: first vertical part, 143: first horizontal part)
150: cover bottom (151: lower surface, 153: edge)
210: pad (213: optical sheet pressing part)

Claims (10)

a liquid crystal panel;
a light guide plate positioned under the liquid crystal panel;
an LED assembly positioned along the light incident surface of the light guide plate;
A first optical sheet positioned above the light guide plate, a second positioned above the first optical sheet, having a first pad step at one corner corresponding to the light-incoming surface, and a first tape step at one edge an optical sheet;
a reflector positioned under the light guide plate
Including, a part of one corner of the first optical sheet is exposed by the first pad step, and a part of an edge of the first optical sheet is exposed by the first tape step,
A double-sided adhesive tape is positioned above the edge of the second optical sheet, and the double-sided adhesive tape is disposed on both the edge of the first optical sheet exposed by the first tape step and the edge of the second optical sheet. attached
liquid crystal display.
delete a liquid crystal panel;
a light guide plate positioned under the liquid crystal panel;
an LED assembly positioned along the light incident surface of the light guide plate;
A first optical sheet positioned above the light guide plate, a second positioned above the first optical sheet, having a first pad step at one corner corresponding to the light-incoming surface, and a first tape step at one edge an optical sheet;
a reflector positioned under the light guide plate
Including, a part of one corner of the first optical sheet is exposed by the first pad step, and a part of an edge of the first optical sheet is exposed by the first tape step,
A pad insertion groove is provided corresponding to one corner of the light guide plate corresponding to the light carrying surface, and a pad is inserted into the pad insertion groove.
4. The method of claim 3,
The pad includes an optical sheet fixing part extending from the upper surface, and the optical sheet fixing part is a part of one corner of the first optical sheet exposed by the first pad step, and a part of one corner of the second optical sheet. A liquid crystal display that is fixed by pressing all .
5. The method of claim 4,
A second pad step is provided at one corner corresponding to the light carrying surface of the first optical sheet, and the second pad step exposes the pad insertion groove.
6. The method of claim 5,
The first pad step is larger than the second pad step, and the pad insertion groove and one corner of the first optical sheet are both exposed by the first pad step.
7. The method of claim 6,
A third optical sheet is further positioned above the second optical sheet, and a third pad step is provided at one corner corresponding to the light carrying surface, and a second tape step is provided at one edge,
The third pad step is greater than the first pad step, and the second tape step is larger than the first tape step.
The method of claim 1,
The first tape step is located at an edge other than the edge corresponding to the light-intake surface.
The method of claim 1,
a guide panel surrounding edges of the liquid crystal panel, the light guide plate, the reflection plate, the LED assembly, and the first and second optical sheets,
A guide panel step corresponding to the tape step is provided on the rear surface of the horizontal portion of the guide panel, and the rear surface of the horizontal portion and the guide panel step are attached to and fixed to the double-sided adhesive tape.
10. The method of claim 9,
The width of the optical sheet fixing part of the pad, the width of the first tape step, and the width of the horizontal part are all the same.

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