KR102150423B1 - 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 capable of minimizing the flow of the light guide plate while considering the assembly of the light guide plate and the expansion of the light guide plate.
A feature of the present invention is to attach and fix the light guide plate guides on the light guide surface and both sides of the light guide plate, and to form a guide groove for guiding the light guide plate guide on the side of the cover butt. Through this, while minimizing the flow of the light guide plate in the modular liquid crystal display device, it is possible to improve the assembly properties of the light guide plate, and it is possible to prevent the occurrence of warpage due to expansion.
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Description

Liquid crystal display device

The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device capable of minimizing the flow of the light guide plate while considering the assembly of the light guide plate and the expansion of the light guide plate.

The liquid crystal display device (LCD), which is advantageous for displaying moving images and has a high contrast ratio, is actively used in TVs and monitors. The optical anisotropy and polarization of liquid crystals The principle of image implementation is shown.

Such a liquid crystal display device uses a liquid crystal panel bonded by interposing a liquid crystal layer between two parallel substrates as an essential component, and a difference in transmittance is realized by changing the alignment direction of liquid crystal molecules by 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 purpose, a backlight with a light source is disposed on the back of the liquid crystal panel.

1 is a cross-sectional view of a general liquid crystal display device.

As shown, a general liquid crystal display device includes a liquid crystal panel 10, a backlight unit 20, a guide panel 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 therebetween.

A backlight unit 20 is provided behind the liquid crystal panel 10.

The backlight unit 20 includes an LED assembly 29 arranged along the longitudinal direction of one edge of the guide panel 30, a white or silver reflective plate 25 mounted on the cover buttum 50, and such a reflector 25 ) And a plurality of optical sheets 21 interposed thereon and a light guide plate 23 mounted on it.

At this time, the LED assembly 29 is configured on one side of the light guide plate 23, and a plurality of LEDs 29a and an LED PCB (printed circuit board: 29b, hereinafter referred to as a PCB) on which a plurality of LEDs 29a are mounted Includes.

The liquid crystal panel 10 and the backlight unit 20 have a top cover 40 surrounding the upper surface of the liquid crystal panel 10 and the back of the backlight unit 20 with the edges surrounded by a rectangular guide panel 30 The cover buttum 50 covering the is coupled at the front and rear sides, and is integrated through the guide panel 30 as a medium.

Further, reference numerals 19a and 19b denote polarizing plates that are attached to the front and rear surfaces of the liquid crystal panel 10 and control the polarization direction of light, respectively.

On the other hand, in the liquid crystal display configured as described above, since the light efficiency of the light emitted from the LED 29a depends on the distance between the LED 29a and the light-incident surface of the light guide plate 23, it is required to maintain an optimal optical distance.

If the distance between the LED 29a and the light incident surface of the light guide plate 23 is shorter than the optimal optical distance, yellowing and distortion of the light guide plate 23 may occur. Conversely, between the LED 29a and the light incident surface of the light guide plate 23 If the distance is longer than the optimal optical distance, the light efficiency decreases, and the brightness of light supplied to the liquid crystal panel 10 decreases.

Accordingly, in order to maintain the distance between the LED 29a and the light-incident surface of the light guide plate 23 to be the same as the optimal optical distance as designed at the time of manufacturing the liquid crystal display device, the light guide plate 23 ) Is further provided with a stopper (not shown) for maintaining the position.

The stopper (not shown) is provided in a protruding shape on the cover buttum 50, and a groove (not shown) corresponding to the stopper (not shown) is formed at the edge of the light guide plate 23. At this time, the stopper (not shown) and the groove (not shown) of the light guide plate 23 are positioned to correspond to each other at a certain distance, which increases the assembling property of the light guide plate 23 in the process of assembling the backlight unit 20 At the same time, it is designed in consideration of the case in which the light guide plate 23 expands due to heat generated from the LED 29a.

However, if the gap between the stopper (not shown) and the groove (not shown) of the light guide plate 23 is decreased, the flow of the light guide plate 23 can be reduced, but the light guide plate 23 is expanded by the heat generated from the LED 29a. Accordingly, a problem occurs in that the image display quality of the liquid crystal panel 10 is deteriorated due to bending.

In addition, if the distance between the stopper (not shown) and the groove (not shown) of the light guide plate 23 is increased, the problem that the light guide plate 23 expands and bends by the heat generated from the LED 29a can be reduced, but the light guide plate 23 ) Flow occurs, the distance between the LED 29a and the light-incident surface of the light guide plate 23 is changed, resulting in a problem of lowering the light efficiency.

In addition, when the light guide plate 23 flows, foreign matter may occur due to the splitting of the light guide plate 23, and a uniform surface light source cannot be implemented due to the splitting of the light guide plate 23 in the process of implementing the surface light source. Can cause.

In particular, when the stopper (not shown) is formed of a material having elasticity such as silicon, even the compression amount according to the elasticity of the stopper (not shown) increases the fluidity of the light guide plate 23.

In addition, when the gap between the stopper (not shown) and the groove (not shown) of the light guide plate 23 is increased, the recently requested display area is wide and the bezel (not shown) is a non-display area other than the display area. The bezel area has a disadvantage in that it is not possible to implement a narrow bezel that is formed as small as possible.

The present invention is to solve the above problems, and it is a first object to minimize the flow of the light guide plate while considering the expansion of the light guide plate due to heat.

Through this, the second object is to improve the screen display quality of the liquid crystal display.

In addition, it is a third object to provide a liquid crystal display device having a narrow bezel.

In order to achieve the object as described above, the present invention includes an LED assembly; A light guide plate including a light incident surface corresponding to the LED assembly, a light incident surface opposite to the light incident surface, and both side surfaces connecting the light incident surface and the light incident surface; A light guide plate guide including a support portion attached to the light-incident surface of the light guide plate and both sides of the light guide plate, and a guide portion protruding outward from the support portion; A liquid crystal panel mounted on the optical sheet; It provides a liquid crystal display device comprising a horizontal surface on which the light guide plate is mounted, a side surface vertically bent from the horizontal surface, and a cover bottom formed with a guide groove through which the guide portion is inserted into the side surface.

At this time, both sides of the guide groove include guide ends that are vertically bent and protrude from the side surface, and a spaced apart between the side surface of the cover butt and the support part of the light guide plate guide in a state where the light guide plate is not expanded. Have.

In addition, an optical sheet fixing part protrudes upward from the guide part, an optical sheet is mounted on the upper part of the light guide plate, and a protrusion including a fixing hole is formed along the edge of the optical sheet, and the optical sheet fixing part is formed into the fixing hole. The fitting is inserted.

In addition, a guide panel including a vertical portion surrounding an edge of the backlight unit and a horizontal portion supporting a rear edge of the liquid crystal panel, and a protruding jaw for pressing the guide portion is provided under the horizontal portion of the guide panel. And a reflective plate positioned under the light guide plate.

As described above, in accordance with the present invention, by attaching and fixing the light guide plate guides on the light guide surface and both sides of the light guide plate, and forming a guide groove to guide the light guide plate guide on the side of the cover bottom, the modularized liquid crystal display device In addition, while minimizing the flow of the light guide plate, it is possible to improve the assembly properties of the light guide plate, and there is an effect of preventing the occurrence of warpage due to expansion.

Through this, there is an effect of preventing a problem in which the light efficiency of the backlight unit decreases due to a change in the distance between the LED and the light incident surface of the light guide plate.

In addition, it is possible to prevent the occurrence of foreign matters caused by the flow of the light guide plate, and thus, there is an effect of preventing a problem of deteriorating image quality of the liquid crystal panel.

In addition, there is an effect of preventing the occurrence of a problem in that a uniform surface light source could not be realized because the light incident inside the light guide plate cannot be spread evenly to a wide area of the light guide plate due to the splitting of the light guide plate. It is possible to prevent the occurrence of warping due to the effect of improving the screen display quality of the liquid crystal display.

In addition, since the expansion gap designed in consideration of the expansion of the light guide plate by heat and the assembly gap designed to improve the assembling property of the light guide plate are not separately required, the effect of providing a liquid crystal display device having a narrow bezel is have.

In addition, the position of the optical sheet located on the upper part of the light guide plate can be fixed through the light guide plate guide, which has the effect of preventing deterioration of the screen display quality due to the flow of the optical sheet, and also fixing the position of the optical sheet. It is possible to omit a separate fixing structure for the process, there is an effect that can reduce the assembly time and process cost.

In addition, by omitting a separate fixing structure for fixing the optical sheet, there is an effect of implementing a lightweight, thin, and narrow bezel.

1 is a cross-sectional view of a general liquid crystal display device.
2 is a schematic perspective view of a liquid crystal display according to an embodiment of the present invention.
3A is a perspective view schematically showing a light guide plate to which a light guide plate guide is attached and fixed according to an embodiment of the present invention, and a part of a cover buttom.
3B is a plan view schematically showing a part of a light guide plate and a cover butt to which a light guide plate guide is attached and fixed.
4 is a perspective view schematically showing a part of a light guide plate to which a light guide plate guide is attached and fixed, an optical sheet, and a cover butt according to an embodiment of the present invention.
Figure 5 is a schematic cross-sectional view of a portion of Figure 2 modularized.

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

2 is a schematic perspective view of a liquid crystal display according to an exemplary embodiment of the present invention.

As shown, the liquid crystal display device according to the exemplary embodiment of the present invention includes a liquid crystal panel 110 and a backlight unit 120, and a guide panel 130 and a cover bottom 150.

At this time, if the direction on the drawing is defined for convenience of explanation, the backlight unit 120 is disposed at the rear of the liquid crystal panel 110 under the premise that the display surface of the liquid crystal panel 110 faces forward, and The cover bottom 150 is located on the rear surface of the backlight unit 120 while the square-shaped guide panel 130 is enclosed and integrated.

Let's look at each of these in more detail.

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

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

And the inner surface of the second substrate 114 called the upper substrate or the color filter substrate, as an example corresponding to each pixel, is a color filter of red (R), green (G), and blue (B) colors, and these A black matrix covering each of the gate lines, data lines, and thin film transistors is provided.

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

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

Further, polarizing plates 119a and 119b (refer to FIG. 5) that selectively transmit only 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 connecting member 116 such as a flexible circuit board or a tape carrier package (TCP) to guide the module in the process of modularization. The side surface of the panel 130 or the rear surface of the cover butt 150 is properly folded and adhered.

Accordingly, when the selected thin film transistor 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 electric field between the pixel electrode and the common electrode generated thereby, indicating a difference in transmittance.

In addition, the liquid crystal display device according to the present invention includes a backlight unit 120 that supplies light from a rear surface of the liquid crystal panel 110 so that a difference in transmittance of 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 reflector 125, a light guide plate 123 mounted on the reflector 125, and It includes an optical sheet 121 positioned above the light guide plate.

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 so as to face the light incident surface 123a of the light guide plate 123, and the LED assembly 129 includes a plurality of LEDs 129a. ), and a plurality of LEDs 129a are mounted at a predetermined interval and a PCB 129b.

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

In particular, in recent years, 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, a 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 implementing white light.

The light guide plate 123 into which the light emitted from the plurality of LEDs 129a is incident is spread evenly to a wide area of the light guide plate 123 while the light incident from the LEDs 129a travels within the light guide plate 123 by several total reflections. A surface light source is provided to the liquid crystal panel 110.

The light guide plate 123 is excellent in transparency, weather resistance, and colorability, and thus induces diffusion of light when light is transmitted.

The light guide plate 123 is made of a plastic material such as polymethylmethacrylate (PMMA), an acrylic transparent resin that is one of the transmissive materials that can transmit light, or a polycarbonate (PC) series. PMMA, which has excellent transparency, weather resistance, and colorability, which induces light diffusion when light is transmitted through it, is the most widely used.

The light guide plate 123 connects the light incident surface 123a corresponding to the LED assembly 129a, the light incident surface 123b corresponding thereto, and the light incident surface 123a and the light incident surface 123b. It consists of a surface 123e and a lower surface 123f facing the reflector 125, and both side surfaces 123c and 123d facing each other.

The light guide plate 123 may include a pattern of a specific shape on the lower surface 123f to supply a uniform surface light source. Here, the pattern can be configured in various ways, such as an elliptical pattern, a polygon pattern, and a hologram pattern, in order 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, the light incident surface 123a of the light guide plate 123 corresponding to one edge where the LED assembly 129 is located has the light incident surface 123a of the light guide plate 123 and the LED assembly along the length direction of the light incident surface 123a. A stopper (123g) for maintaining the optical separation distance of 129) is provided.

That is, the backlight unit 120 has a width called an optical gap or an air gap, that is, the gap between the LED assembly 129 and the light incident surface 123a of the light guide plate 123 is the backlight unit 120 ) Serves as one of the optical designs for supplying a high-quality surface light source, which is the most important role, to the liquid crystal panel 110.

Therefore, by providing the stopper 123g on the light-incident surface 123a of the light guide plate 123, the distance between the light-incident surface 123a of the light guide plate 123 and the LED assembly 129 is kept constant, and a high-quality surface The light source may be provided to the liquid crystal panel 110.

In addition, the light guide plate guide 200 for preventing the flow of the light guide plate 123 to the opposite side of the light incident surface 123a provided with the stopper 123g and to both sides 123c and 123d is attached and fixed. It is characterized by being.

The light guide plate guide 200 includes a support part 210 attached in close contact with the light guide surface 123b and both sides 123c and 123d of the light guide plate 123 and a guide protruding from the support part 210 to the opposite side of the light guide plate 123 It includes a portion 220, the guide portion 220 is formed by protruding an optical sheet fixing portion 230.

In the liquid crystal display device according to the exemplary embodiment of the present invention through the light guide plate guide 200, the position of the light guide plate 123 is substantially fixed in the modular liquid crystal display device, thereby preventing the light guide plate 123 from flowing. Through this, it is possible to prevent the occurrence of a problem in which the light efficiency of the backlight unit 120 is deteriorated due to a change in the distance between the LED 129a and the light incident surface 123a of the light guide plate 123.

In addition, it is possible to prevent the occurrence of foreign matters due to the flow of the light guide plate 123, and it is possible to prevent the occurrence of a problem in which a uniform surface light source cannot be realized due to the splitting of the light guide plate 123.

In addition, even if the light guide plate 123 is expanded due to heat generated by the driving of the LED assembly 129, it is possible to prevent the occurrence of warpage due to the expansion of the light guide plate 123, so that the screen display of the liquid crystal display device Can improve quality.

In addition, since the expansion gap designed in consideration of the expansion of the light guide plate 123 due to heat and the assembly gap designed to improve the assembling property of the light guide plate 123 are not separately required, a liquid crystal display device having a narrow bezel is provided. Can provide. We will look at this in more detail later.

The reflector 125 is positioned on the rear surface of the light guide plate 123 and reflects the light that has passed 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 121 on the light guide plate 123 includes a diffusion sheet and at least one light collecting sheet.

Here, the diffusion sheet is positioned directly above the light guide plate 123 and serves to adjust the direction of light so that the light proceeds toward the light collecting sheet while dispersing the light incident through the light guide plate 123.

Then, the light diffused through the diffusion sheet is condensed toward the liquid crystal panel 110 by the light collecting sheet. Accordingly, most of the light passing through the light collecting sheet proceeds perpendicular to the liquid crystal panel 110.

Here, in the optical sheet 121, a protrusion 121a including a fixing hole 121b is protruded at the edge, and the optical sheet 121 is formed as a fixing hole 121b of the protrusion 121a in the modularization process. The optical sheet fixing part 230 of the guide 200 is fitted and inserted.

Accordingly, the optical sheet 121 is fixed without flow in the liquid crystal display device.

The liquid crystal panel 110 and the backlight unit 120 are modularized through the guide panel 130 and the cover bottom 150, and the cover bottom 150 includes the liquid crystal panel 110 and the backlight unit 120 on which the backlight unit 120 is mounted. A horizontal plane 151 is provided to support the entire liquid crystal display and at the same time play the role of a lower frame that minimizes the occurrence of optical loss, and the edge of the horizontal plane 151 is vertically bent to close the side surface 153 of the cover Achieve.

At this time, as the light guide plate guide 200 is attached and fixed to the light guide surface 123b and both side surfaces 123c and 123d of the light guide plate 123, the light guide plate guide 200 is positioned between the side surface 153 of the cover buttum 150 and the light guide plate 123 However, a guide groove 155 for guiding the flow of the light guide plate guide 200 due to the expansion of the light guide plate 123 is formed on the side surface 153 of the cover bottom 150 corresponding to the light guide plate guide 200. It is characterized.

Both sides of the guide groove 155 include guide ends 155a that are vertically bent and protruded from the side surface 153 of the cover butt 150 inward.

Then, the guide panel 130 surrounding the edge of the backlight unit 120 is mounted on the cover buttoum 150.

The guide panel 130 has a rectangular frame shape for supporting the edge of the liquid crystal panel 110 and surrounding the edge of the backlight unit 120, and a vertical portion 131 and a vertical portion 131 surrounding the side surface of the backlight unit 120 ) Is vertically bent inward to separate the positions of the liquid crystal panel 110 and the backlight unit 120, a horizontal portion 133 is provided.

The liquid crystal panel 110 is attached and fixed on the horizontal portion 133 through an adhesive pad 160 (see FIG. 6) such as double-sided tape.

In this case, the guide panel 130 may be referred to as a support main or a main support, or a mold frame, and the cover buttom 150 may be referred to as a bottom cover or a lower cover.

Here, the liquid crystal display device of the present invention omits the top cover (40 in FIG. 1), which was located in front of the liquid crystal panel 110, so that the liquid crystal display device can be thin and light, and the process is simplified. In addition, process cost can be reduced.

In addition to being lightweight and thin, the display area is expanded by omitting the top cover (40 in FIG. 1), and the bezel area, which is a non-display area other than the display area, is reduced. A liquid crystal display device can be provided.

In the liquid crystal display device according to the embodiment of the present invention described above, the light guide plate guide 200 is attached and fixed to the light guide surface 123b and both side surfaces 123c and 123d of the light guide plate 123, and the side surface of the cover bottom 150 By forming a guide groove 155 capable of guiding the light guide plate guide 200 in the 153, it is possible to minimize the flow of the light guide plate 123 in a modular liquid crystal display device, while improving the assemblability of the light guide plate 123 It is possible to prevent the occurrence of warpage due to expansion.

Through this, it is possible to prevent the occurrence of a problem in which the light efficiency of the backlight unit 120 is deteriorated due to a change in the distance between the LED 129a and the light incident surface 123a of the light guide plate 123.

In addition, it is possible to prevent the generation of foreign matters caused by the flow of the light guide plate 123, and thus, a problem in that the image quality of the liquid crystal panel 110 is deteriorated can be prevented.

In addition, it is possible to prevent the occurrence of a problem in which a uniform surface light source cannot be implemented because the light incident into the light guide plate 123 due to the splitting of the light guide plate 123 cannot be evenly spread to a wide area of the light guide plate 123.

In addition, it is possible to prevent the occurrence of warpage due to the expansion of the light guide plate 123, so that the screen display quality of the liquid crystal display can be improved, and the expansion gap and the light guide plate designed in consideration of the expansion of the light guide plate 123 due to heat Since the assembly gaps designed to improve the assembly properties of 123 are not separately required, a liquid crystal display device having a narrow bezel can be provided.

In addition, since the position of the optical sheet 121 positioned above the light guide plate 123 can be fixed through the light guide plate guide 200, it is possible to prevent the screen display quality from deteriorating due to the flow of the optical sheet 121. Also, since a separate fixing structure for fixing the position of the optical sheet 121 can be omitted, it is possible to shorten the process assembly time and reduce the process cost.

In addition, by omitting a separate fixing structure for fixing the optical sheet 121, it is possible to implement a lightweight, thin, and narrow bezel.

3A is a perspective view schematically showing a light guide plate to which a light guide plate guide is attached and fixed, and a part of a cover butt, and FIG. 3B is a schematic perspective view showing a light guide plate to which a light guide plate guide is attached and fixed, and a part of a cover butt. It is a plan view shown as.

As shown, the reflecting plate (125 in FIG. 2) and the light guide plate 123 are sequentially seated on the horizontal surface 151 of the cover bottom 150, at this time, the light guide surface 123b and both sides of the light guide plate 123 The light guide plate guide 200 is attached and fixed to 123c (123d in FIG. 2).

The light guide plate guide 200 includes a support part 210 that is directly attached and fixed to the light guide plate 123, respectively, to the light guide surface 123b and both side surfaces 123c (123d in FIG. 2), and the cover bottom 150 from the support part 210. Includes a guide portion 220 protruding toward the side 153 of the, and the optical sheet fixing portion 230 on the opposite side of the horizontal surface 151 of the cover bottom 150 in parallel with the support portion 210 in the guide portion 220 ) Protrudes upward.

The light guide plate guide 200 may be formed integrally with the light guide plate 123, or the light guide plate guide 200, which is configured separately, is provided with the carrying surface 123b of the light guide plate 123 through a double-sided adhesive tape (not shown). It can be attached and fixed to the side (123c, 123d) of FIG.

Here, a guide groove 155 into which the guide portion 220 of the light guide plate guide 200 is inserted is formed on the side surface 153 of the cover buttum 150.

At this time, both sides of the guide groove 155 are vertically bent and protruded inward from the side surface 153 of the cover butt 150, and guide ends 155a for guiding the guide portion 220 of the light guide plate guide 200 are formed. have.

That is, one surface of the support part 210 of the light guide plate guide 200 is attached in close contact with the light guide plate 123 of the carrying surface 123b and both sides 123c (123d in FIG. 2), and the opposite side of the support part 210 On the inner surface, a guide part 220 is formed to protrude toward the side surface 153 of the cover butt 150, and the guide part 220 is inserted and inserted into the guide groove 155 of the cover butt 150.

At this time, the guide unit 220 includes a pair of guide side surfaces 220a and 220b that are vertically bent from the other surface of the support unit 210 and a guide surface 220c connecting the pair of guide side surfaces 220a and 220b. The guide side surfaces 220a and 220b of the cover bottom 150 are spaced apart from the guide end 155a of the cover bottom 150 and face each other in parallel.

Here, an assembly gap is required between the light guide plate 123 and the cover bottom 150 in order to improve the assembling property of the light guide plate 123 in the process of modularizing the liquid crystal display device, and further, the LED (129a in FIG. 2) An expansion gap according to the expansion of the light guide plate 123 should be designed in consideration of a case in which the light guide plate 123 expands due to heat generated from the light guide plate 123.

When the assembly gap and the expansion gap are designed to be wide, it is possible to consider the assembleability of the light guide plate 123 and the warpage caused by the expansion of the light guide plate 123, but the light efficiency decreases due to the flow of the light guide plate 123 May occur, and foreign matter due to the splitting of the light guide plate 123 and a problem in that a uniform surface light source cannot be implemented may occur.

In particular, it becomes impossible to implement the narrow bezel that is required recently.

Therefore, an optimal design is required to improve the assembling property of the light guide plate 123 and to minimize the flow of the light guide plate 123 while considering the expansion of the light guide plate 123. The liquid crystal display device according to the embodiment of the present invention has a cover Although both the assembly gap of the light guide plate 123 and the expansion gap due to the expansion of the light guide plate 123 can be secured through a certain distance D between the side surface 153 of the buttum 150 and the light guide plate 123, the light guide plate ( 123) flow can be minimized.

Looking at this in detail, the light guide plate 123 according to the embodiment of the present invention is attached to and fixed to the light guide surface 123b and both sides 123c (123d in FIG. 2) of the light guide plate 123 , In order to secure the assembly gap of the light guide plate 123, it is preferable to design an assembly gap between the light guide plate guide 200 and the side surface 153 of the cover bottom 150.

In addition, in consideration of the case where the expansion of the light guide plate 123 occurs due to heat generated from the LED (129a in FIG. 2), the expansion gap due to the expansion of the light guide plate 123 must also be considered, and the expansion gap is also related to the light guide plate guide 200 It is preferable to design it between the side surfaces 153 of the cover bottom 150.

Here, in order to design an expansion gap according to the expansion of the light guide plate 123, the side surface 153 of the cover buttum 150 and the light guide plate guide 200 are formed to have a constant spacing (D).

In addition, in order to improve the assembling property of the light guide plate 123, the assembly gap to be designed between the light guide plate guide 200 and the side surface 153 of the cover bottom 150 is the other surface and the cover of the support part 210 of the light guide plate guide 200 Between the side surface 153 of the buttock 150 (a) and between the guide surface 220c of the guide portion 220 of the light guide plate guide 200 and the side surface 153 of the cover butt 150 (b), and the light guide plate guide ( It should be formed between the guide side (220a, 220b) of the guide portion (200) (220) and the guide end (155a) of the cover bottom (150) (c).

At this time, since (a) between the other surface of the support part 210 of the light guide plate guide 200 and the side surface 153 of the cover buttum 150 is formed to have a constant distance (D) from each other by the expansion gap, a separate assembly gap Do not have to design.

In addition, a guide groove 155 is formed on the side surface 153 of the cover bottom 150, and a light guide plate guide attached and fixed to the light guide surface 123b and both sides 123c of the light guide plate 123, 123d in FIG. By allowing the guide portion 220 of the 200 to be inserted into the guide groove 155, the gap between the guide side surfaces 220a and 220b of the light guide plate guide 200 and the guide end 155a of the cover bottom 150 (c ) Only requires an assembly gap, and does not require an assembly gap between (b) the side surface 153 of the cover butt 150 and the guide surface 220c of the light guide plate guide 200.

That is, only the separation distance D is required between the side surface 153 of the cover buttum 150 and the light guide surface 123b and both side surfaces 123c (123d in FIG. 2) of the light guide plate 123, and the separation distance ( Through D), both the assembly gap and the expansion gap are secured at the light guide plate 123 of the carrying surface 123b and both side surfaces 123c (123d of FIG. 2).

In addition, the light guide plate 123 according to the embodiment of the present invention has a flow in the X-axis direction defined in the drawing, and the guide side surfaces 220a and 220b of the light guide plate guide 200 attached to the carrying surface 123b of the light guide plate 123 ) And the guide end 155a of the guide groove 155 of the cover bottom 150, the flow is minimized, and the flow in the Y-axis direction defined in the drawing is on both sides 123c of the light guide plate 123, FIG. 2 The flow is minimized by the guide side surfaces 220a and 220b of the light guide plate guide 200 attached to 123d) and the guide end 155a of the guide groove 155 of the cover bottom 150.

Accordingly, in the liquid crystal display according to the exemplary embodiment of the present invention, the light guide plate guide 200 is attached and fixed to the light guide plate 123 on the light guide surface 123b and both side surfaces 123c (123d in FIG. 2), and the cover bottom 150 ) By forming a guide groove 155 capable of guiding the light guide plate guide 200 on the side 153 of the module, thereby minimizing the flow of the light guide plate 123 in the modular liquid crystal display device, and assembling the light guide plate 123 It can improve the property, and can prevent the occurrence of warpage due to expansion.

Through this, the distance between the LED (129a in FIG. 2) and the light-incident surface of the light guide plate 123 (123a in FIG. 2) is changed to prevent the problem that the light efficiency of the backlight unit (120 in FIG. 2) decrease. I can.

In addition, it is possible to prevent the occurrence of foreign matters caused by the flow of the light guide plate 123, and thus, a problem in that the image quality of the liquid crystal panel (110 in FIG. 2) is deteriorated can be prevented.

In addition, it is possible to prevent the occurrence of a problem in which a uniform surface light source cannot be implemented because the light incident into the light guide plate 123 due to the splitting of the light guide plate 123 cannot be evenly spread to a wide area of the light guide plate 123.

In addition, it is possible to prevent the occurrence of warpage due to the expansion of the light guide plate 123, so that the screen display quality of the liquid crystal display can be improved, and the expansion gap and the light guide plate designed in consideration of the expansion of the light guide plate 123 due to heat Since the assembly gaps designed to improve the assembly properties of 123 are not separately required, a liquid crystal display device having a narrow bezel can be provided.

In addition, in the liquid crystal display according to the exemplary embodiment of the present invention, the position of the optical sheet (121 in FIG. 2) positioned above the light guide plate 123 can be fixed through the light guide plate guide 200, see FIG. So, let's take a closer look.

4 is a perspective view schematically showing a part of a light guide plate to which a light guide plate guide is attached and fixed, an optical sheet, and a cover butt according to an embodiment of the present invention.

As shown, the reflecting plate (125 in FIG. 2), the light guide plate 123, and the optical sheet 121 are sequentially seated on the horizontal plane (151 in FIG. 3B) of the cover bottom (150 in FIG. 3B). At this time, the light guide plate The light guide plate guide 200 is attached and fixed to the carrying-in light surface 123b of 123 and both side surfaces (123c and 123d in FIG. 2).

At this time, the guide part 220 of the light guide plate guide 200 is provided with an optical sheet fixing part 230 that protrudes upward to the opposite side of the horizontal plane (151 in FIG. 3B) of the cover bottom (150 in FIG. 3B), and the optical sheet ( A protrusion 121a including a fixing hole 121b protrudes along the edge of the 121, and the optical sheet fixing part 230 is formed by a fixing hole 121b formed in the protrusion 121a of the optical sheet 121. The fitting is inserted.

Through this, the optical sheet 121 is fixed without flow in the liquid crystal display.

That is, the light guide plate guide 200 according to the embodiment of the present invention can minimize the flow of the light guide plate 123 while securing the assembly gap and the expansion gap of the light guide plate 123, and can also fix the optical sheet 121 I can.

Therefore, it is possible to prevent the screen display quality from deteriorating due to the flow of the optical sheet 121, and also, it is possible to omit a separate fixing structure for fixing the position of the optical sheet 121, reducing the process assembly time and It can lower the process cost.

In addition, by omitting a separate fixing structure for fixing the optical sheet 121, it is possible to implement a lightweight, thin, and narrow bezel.

FIG. 5 is a schematic cross-sectional view of a part of FIG. 2 that is modularized.

As shown, an optical sheet on the top of the reflective plate 125, the light guide plate 123, the LED assembly 129 comprising the PCB 129b on which the LED 129a and the LED 129a are mounted, and the light guide plate 123 121 are stacked to form the backlight unit 120.

In addition, a liquid crystal panel 110 with a liquid crystal layer (not shown) interposed therebetween is located on the first and second substrates 112 and 114 on the backlight unit 120, and the first and second substrate 112 Polarizing plates 119a and 119b that selectively transmit only specific light are attached to the outer surfaces of each of the elements 114.

The edge of the backlight unit 120 and the liquid crystal panel 110 is surrounded by the guide panel 130, and the cover bottom 150 is coupled to the rear surface thereof to be modularized.

Here, the liquid crystal panel 110 is attached and fixed by supporting the rear edge of the liquid crystal panel 110 on the horizontal portion 133 of the guide panel 130 through an adhesive pad 160 such as a double-sided tape.

At this time, in the liquid crystal display according to the exemplary embodiment of the present invention, the light guide plate guide 200 is attached and fixed to the light guide plate 123 on the carrying surface 123b, and the cover bottom 150 corresponding to the light guide plate guide 200 A guide groove 155 for guiding the flow of the light guide plate guide 200 is formed on the side surface 153.

Here, the light guide plate guide 200 includes a support part 210 that is attached and fixed to the light guide surface 123b of the light guide plate 123, and a guide protruding from the support part 210 toward the side surface 153 of the cover bottom 150 Consisting of a part 220, the guide part 220 is inserted into the guide groove 155 of the cover buttum 150.

Therefore, when the light guide plate 123 expands due to heat generated by the driving of the LED assembly 129 in the process of implementing an image in the liquid crystal display, the light guide plate 123 expands in the X-axis direction defined in the drawing, It can prevent the occurrence of warpage due to expansion.

And, the optical sheet fixing part 230 formed by protruding upward from the guide part 220 of the light guide plate guide 200 is inserted into the fixing hole 121b formed in the protruding part 121a of the optical sheet 121 It is possible to prevent the flow of the sheet 121.

At this time, a protruding protrusion 135 is provided below the horizontal portion 133 of the guide panel 130 so that the protruding protrusion 135 presses the guide part 220 of the light guide plate guide 200, so that the light guide plate ( 123) It is possible to prevent flow in the Z-axis direction defined in this drawing.

In the liquid crystal display device according to the embodiment of the present invention described above, the light guide plate guide 200 is attached and fixed to the light guide surface 123b and both sides (123c and 123d in FIG. 2) of the light guide plate 123, and the cover bottom 150 ) By forming a guide groove 155 capable of guiding the light guide plate guide 200 on the side 153 of the module, thereby minimizing the flow of the light guide plate 123 in the modular liquid crystal display device, and assembling the light guide plate 123 It can improve the property, and can prevent the occurrence of warpage due to expansion.

Through this, it is possible to prevent the occurrence of a problem in which the light efficiency of the backlight unit 120 is deteriorated due to a change in the distance between the LED 129a and the light incident surface 123a of the light guide plate 123.

In addition, it is possible to prevent the generation of foreign matters caused by the flow of the light guide plate 123, and also prevent the problem of deteriorating the image quality of the liquid crystal panel 110 due to the foreign matters.

In addition, it is possible to prevent the occurrence of a problem in which a uniform surface light source cannot be implemented because the light incident into the light guide plate 123 due to the splitting of the light guide plate 123 cannot be evenly spread to a wide area of the light guide plate 123.

In addition, it is possible to prevent the occurrence of warpage due to the expansion of the light guide plate 123, so that the screen display quality of the liquid crystal display can be improved, and the expansion gap and the light guide plate designed in consideration of the expansion of the light guide plate 123 due to heat Since the assembly gaps designed to improve the assembly properties of 123 are not separately required, a liquid crystal display device having a narrow bezel can be provided.

In addition, since the position of the optical sheet 121 positioned above the light guide plate 123 can be fixed through the light guide plate guide 200, it is possible to prevent the screen display quality from deteriorating due to the flow of the optical sheet 121. Also, since a separate fixing structure for fixing the position of the optical sheet 121 can be omitted, it is possible to shorten the process assembly time and reduce the process cost.

In addition, by omitting a separate fixing structure for fixing the optical sheet 121, it is possible to implement a lightweight, thin, and narrow bezel.

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

123: light guide plate (123b: light entering surface)
153: The side of covertum
155: guide groove (155a: guide end)
200: light guide plate guide (210: support, 220: guide part (220a, 220b: guide side, 220c: guide surface), 230: optical sheet fixing part)

Claims (7)

LED assembly;
A light guide plate including a light incident surface corresponding to the LED assembly, a light incident surface opposite to the light incident surface, and both side surfaces connecting the light incident surface and the light incident surface;
A light guide plate guide including a support portion attached to the light-incident surface of the light guide plate and both sides of the light guide plate, and a guide portion protruding outward from the support portion;
A liquid crystal panel mounted on the light guide plate;
A cover bottom including a horizontal surface on which the light guide plate is seated, and a side surface vertically bent from the horizontal surface, and having a guide groove to be inserted into the side surface to be guided
Including,
A liquid crystal display device including guide ends which are vertically bent and protruded from the side surface to the inside at both sides of the guide groove.
delete The method of claim 1,
A liquid crystal display device having a gap between the side surface of the cover butt and the support part of the light guide plate guide in a state in which the light guide plate is not expanded.
The method of claim 1,
An optical sheet fixing part protrudes upward from the guide part.
The method of claim 4,
An optical sheet is mounted on the top of the light guide plate,
A protrusion including a fixing hole is formed along an edge of the optical sheet, and the optical sheet fixing part is inserted into the fixing hole.
The method of claim 1,
And a guide panel including a vertical portion surrounding the edge of the LED assembly and the light guide plate, and a horizontal portion supporting the rear edge of the liquid crystal panel, and a protruding jaw for pressing the guide portion is provided under the horizontal portion of the guide panel. Liquid crystal display.
The method of claim 1,
A liquid crystal display device comprising a reflective plate positioned under the light guide plate.

Images