KR102574240B1 - Liquid crystal display device - Google Patents

Abstract

The present invention relates to a light guide plate having a pad insertion part at one edge of a light-receiving surface and having a pad fixing part in the pad insertion part, a pad inserted into the pad insertion part and hooked and fixed to the pad fixing part, and a mouth of the light guide plate. Provided is a liquid crystal display device including an LED assembly attached along a light surface, an optical sheet mounted on the light guide plate, and a liquid crystal panel mounted on the optical sheet.

Description

Liquid crystal display {LIQUID CRYSTAL DISPLAY DEVICE}

The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device in which a pad is prevented from being removed from a panel insertion portion of a light guide plate by changing a structure of a light guide plate or a lower cover.

The liquid crystal display device (LCD), which is advantageous for displaying moving images and has a large contrast ratio, is actively used in TVs and monitors. shows the principle of image implementation by

Such a liquid crystal display device has as an essential component a liquid crystal panel bonded by interposing a liquid crystal layer between two parallel substrates, and realizes a difference in transmittance 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 a self-luminous element, a separate light source is required to display the transmittance difference as an image, and for this, a backlight having a light source is disposed on the rear surface of the liquid crystal panel.

The backlight unit uses a cold cathode fluorescent lamp (CCFL), an external electrode fluorescent lamp, and a light emitting diode (LED, hereinafter referred to as LED) as a light source.

Among them, in particular, the LED is a trend that is widely used as a light source for display by combining features such as small size, low power consumption, and high reliability.

On the other hand, a general backlight unit is divided into a direct type type and an edge type type according to the arrangement structure of the lamps. A pair of light sources is disposed on both sides of the light guide plate, and the direct type method has a structure in which several light sources are disposed below the liquid crystal panel.

Among these, the direct type has limitations in thinning, so it is mainly used in liquid crystal display devices where brightness is more important than the thickness of the screen. It is mainly used in liquid crystal display devices where the same thickness is important.

1 is a plan view schematically showing a coupled state of a light guide plate and a lower cover of a liquid crystal display according to the prior art.

FIG. 2 is an enlarged view of portion A of FIG. 1, showing an enlarged view of a state in which a pad is interposed between a light guide plate and a lower cover of a conventional liquid crystal display device.

FIG. 3 is a cross-sectional view taken along line III-III of FIG. 2, and is a combined cross-sectional view of a liquid crystal display according to the prior art.

4 is a cross-sectional view schematically illustrating a state in which a pad is removed between a lower cover and a light guide plate in a conventional liquid crystal display device.

As shown in FIGS. 1 to 4, the liquid crystal display according to the prior art is composed of a liquid crystal panel (not shown), a backlight unit (not shown), a guide panel (not shown), and a lower cover 50.

Although not shown in the drawing, a backlight unit (not shown) is provided behind the liquid crystal panel (not shown), and the backlight unit is an LED assembly (not shown) arranged along the longitudinal direction of at least one edge of the guide panel (not shown). ), a white or silver reflector (not shown) seated on the lower cover 50, a light guide plate 40 seated on the reflector (not shown), and an optical sheet (not shown) positioned above it include

The liquid crystal panel (not shown) and the backlight unit (not shown) include a top cover (not shown) surrounding the upper edge of the liquid crystal panel (not shown) and a backlight in a state where the edges are wrapped with a rectangular guide panel (not shown). The lower cover 50 covering the back of the unit (not shown) is coupled from the front and rear, respectively, and is integrated through a guide panel (not shown).

And, as shown in FIG. 3 , a pad 60 is compressed and inserted into a space between the light guide plate 40 and the lower cover 50 to fix the light guide plate 40 . At this time, the pad 60 is made of an elastic material and is inserted in a compressed state, and the light guide plate is pushed and fixed with an elastic force to be restored, thereby preventing the light guide plate from moving.

The pad 60 applies force in the X and Y axis directions, that is, in the vertical and horizontal directions, and on the contrary, the pad 60 receives reaction force in the vertical and horizontal directions from the light guide plate 40 to maintain the inserted state, but the vehicle It contracts and expands in a reliable environment such as an operating environment and has a structure that can flow in the Z direction.

In this way, the conventional pad 60 pushes the light guide plate 40 in the X and Y directions, and maintains the inserted state due to a reaction from the light guide plate.

However, as shown in FIG. 4, the existing structure of the pad 60 is subject to contraction, expansion, and shock of the pad 60 in various reliability environments considering the use environment of a liquid crystal display module (LCM). When applied, a problem occurs in the Z direction.

In addition, this problem creates an environment in which the fixed light guide plate 40 can move, causing damage to the light guide plate or other parts due to the flow of the light guide plate, generating noise, and the gap between the light guide plate and the LED being different. This causes the optical properties to change.

The present invention is to solve the above problems, and an object of the present invention is to improve the structure of the light guide plate or the lower cover to prevent the pad from falling out at the pad insertion part of the light guide plate, thereby preventing the flow of other devices. to provide the device.

In order to solve the above problems, in one aspect, the present invention provides a light guide plate having a pad insertion part at one corner of a light-receiving surface and having a pad fixing part in the pad insertion part, and a light guide plate inserted into the pad insertion part to fix the pad A pad hooked and fixed to the top, a reflector positioned below the light guide plate, an LED assembly attached along the light incident surface of the light guide plate, an optical sheet seated on the light guide plate, and a liquid crystal panel seated on the top of the optical sheet. It is possible to provide a liquid crystal display device comprising a.

The size of the pad may be larger than that of the pad insertion part, and the pad may have a bar shape, and a lower surface facing the reflector may have a narrower width than an upper surface facing the liquid crystal panel.

The pad fixing part may be provided such that an upper surface of the pad is hooked and fixed to a light-receiving surface of the light guide plate in the pad insertion part.

And, it may include a lower cover positioned under the light guide plate and having a horizontal surface and an edge portion perpendicular to the horizontal surface.

A cover locking jaw may protrude from the inside of the edge of the lower cover so that the upper surface of the pad is hooked and fixed.

In order to solve the above problems, in another aspect, the present invention provides a light guide plate having a pad insertion part at one corner of a light-receiving surface and having a pad fixing part in the pad insertion part, and a light guide plate inserted into the pad insertion part to fix the pad A pad having pad protrusions hooked and fixed to the top, a reflector positioned below the light guide plate, an LED assembly attached along the light incident surface of the light guide plate, an optical sheet seated on the upper part of the light guide plate, and an upper part of the optical sheet It is possible to provide a liquid crystal display device including a liquid crystal panel to be seated.

The pad fixing part may be provided in the form of the pad protrusion insertion groove inside the carrying-in surface of the light guide plate in the pad insertion part.

In order to solve the above problems, in another aspect, the present invention provides a light input surface corresponding to the LED assembly, a light input surface opposite to the light input surface, and a pad insert provided at one corner of the light input surface To provide a light guide plate including a pad fixing part provided in the pad insertion part, an upper surface connecting the light incident surface and the light entering surface and from which light is emitted, a lower surface facing the reflecting plate, and both side surfaces facing each other. can

The pad fixing part may be provided such that an upper surface of the pad is hooked and fixed to a light-receiving surface of the light guide plate in the pad insertion part.

A pad having a size larger than that of the pad insertion unit, having a bar shape, and having a lower surface narrower than an upper surface may be inserted into the pad insertion unit.

A pad protrusion may be provided on a side surface of the pad.

The pad fixing part may be provided in the form of the pad protrusion insertion groove inside the carrying-in surface of the light guide plate in the pad insertion part.

The liquid crystal display device according to the present invention forms a protruding shape at the end of the light guide plate or the inner edge of the lower cover to prevent the pad from flowing in the Z direction, that is, the liquid crystal panel direction, due to contraction, expansion, shock, etc. even in extreme environments. It is possible to maintain a continuous insertion state in the insertion groove.

In particular, the pad continuously fixes the light guide plate without falling out in the Z direction, i.e., the direction of the liquid crystal panel, even in an extreme environment by the locking jaw or protrusion insertion groove of the light guide plate or the cover locking jaw of the lower cover, thereby reducing noise and damage caused by the flow of the light guide plate. In addition, it is possible to prevent the change in optical characteristics.

In addition, in the liquid crystal display device according to the present invention, a protrusion is formed on a pad used to prevent the light guide plate from moving, or a locking step or protrusion insertion groove is formed to fix the pad to the light guide plate or lower cover to insert the pad of the light guide plate. By preventing the pad from falling out in the Z direction, that is, in the direction of the liquid crystal panel, it is possible to prevent the flow of other instruments.

1 is a plan view of a state in which a pad is inserted between a light guide plate and a lower cover of a conventional liquid crystal display device.
FIG. 2 is an enlarged plan view of portion A of FIG. 1, showing a cross-section of parts of a general liquid crystal display device.
FIG. 3 is a cross-sectional view taken along line III-III of FIG. 2, and is a combined cross-sectional view of a liquid crystal display device in which a pad is inserted between a pad insertion portion of a light guide plate and a lower cover.
4 is a cross-sectional view schematically illustrating a state in which a pad is removed from a pad insertion portion of a light guide plate of a liquid crystal display device according to the prior art.
5 is an exploded perspective view of a liquid crystal display according to an embodiment of the present invention.
6 is a plan view of the arrangement of a light guide plate and a lower cover of a liquid crystal display according to an embodiment of the present invention.
FIG. 7 is an enlarged view of portion B of FIG. 6 , and is a plan view of a state in which a pad is inserted into a pad insertion portion of a light guide plate according to an embodiment of the present invention.
FIG. 8 is a cross-sectional view taken along line VIII-VIII of FIG. 7, and is a combined cross-sectional view of a liquid crystal display schematically showing a state in which the upper surface of a pad is pressed and fixed by a pad fixing part of a light guide plate according to an embodiment of the present invention.
9 is a plan view of the arrangement of a light guide plate and a lower cover of a liquid crystal display device according to another embodiment of the present invention, schematically illustrating a state in which a pad is inserted into a pad insertion part of the light guide plate.
FIG. 10 is a cross-sectional view taken along line X-X of FIG. 9 in a state in which a pad is inserted into the pad insertion part of the light guide plate according to another embodiment of the present invention and is caught and fixed by the locking jaw of the lower cover.
11 is a plan view of the arrangement of a light guide plate and a lower cover of a liquid crystal display device according to another embodiment of the present invention, schematically illustrating a state in which a pad is inserted into a pad insertion part of the light guide plate.
FIG. 12 is a cross-sectional view taken along line XII-XII of FIG. 11, in a state in which a protrusion of a pad according to another embodiment of the present invention is inserted into a pad fixing part of a light guide plate.

Hereinafter, with reference to the drawings, a liquid crystal display device according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

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

As shown in FIG. 5, the liquid crystal display device according to an embodiment of the present invention is composed of a liquid crystal panel 110 and a backlight unit 120 that are vertically overlapped, and as a mechanical element for integrating them, a guide panel ( 130) and a lower cover 150.

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 under the premise that the display surface of the liquid crystal panel 110 is improved in the front, and the outside of them is The lower cover 150 in close contact with the back surface of the backlight unit 120 in the form of a guide panel 130 having a square frame shape is coupled from the front and rear to be integrated.

A more detailed look at each of these components follows.

The liquid crystal panel 110 is a part that plays a key role in displaying images of a liquid crystal display device, and includes a first substrate 112 and a second substrate 114 bonded face to face and a liquid crystal layer interposed therebetween (not shown). city), including

Here, although not shown on the drawing, a plurality of gate lines and data lines intersect to define a pixel on the inner surface of the first substrate 112, which is commonly referred to as a lower substrate or an array substrate, and a thin film transistor at each intersection. (thin film transistor: TFT) is provided and connected in a one-to-one correspondence with the transparent pixel electrode formed in each pixel.

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

A transparent common electrode covering red (R), green (G), and blue (B) color filters and a black matrix is provided.

And, polarizers (not shown) 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 having such a configuration, a printed circuit board 117 is connected via a connecting member 116 such as a flexible circuit board or a tape carrier package (TCP) to modularize In the process, the side of the guide panel or the back of the lower cover 150 is appropriately bent and brought into close contact.

In the liquid crystal panel 110, when the thin film transistor selected for each gate line is turned on by the on/off signal of the gate driving circuit, the signal voltage of the data driving circuit is transferred to the corresponding pixel electrode through the data line. The arrangement direction of the liquid crystal molecules in the liquid crystal layer is changed by the electric field between the pixel electrode and the common electrode, resulting in a difference in transmittance.

In addition, a backlight unit 120 is provided to supply light to the rear surface of the liquid crystal panel 110 so that the difference in transmittance of the liquid crystal panel 110 is expressed to the outside.

The backlight unit 120 includes a white or silver reflector 125, an LED assembly 129 arranged along one edge of the reflector 125, and an optical sheet seated on the light guide plate 123 mounted on the reflector 125 ( 121).

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 and , a PCB 129b on which a plurality of LEDs 129a are mounted at regular intervals.

At this time, the plurality of LEDs 129a emit light having red (R), green (G), and blue (B) colors forwardly 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.

The light guide plate 123 into 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 several times of total reflection. It spreads and provides a surface light source to the liquid crystal panel 110 .

The light guide plate 123 connects the light-incident surface 123a corresponding to the LED assembly 129a, the opposite side opposite to the light-incident surface 123b, and the light-incident surface 123a and the light-incident surface 123b, and connects the light-incident surface 123b to the upper part from which light is emitted. It consists of a surface 123c, a lower surface 123d facing the reflector 125, and both side surfaces 123e and 123f facing each other.

Further, the light guide plate 123 may include a pattern having a specific shape on a lower surface to supply a uniform surface light source. At this time, the pattern may be configured in various ways, such as an elliptical pattern, a polygonal pattern, or a hologram pattern, in order to guide 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.

Here, in the liquid crystal display device according to an embodiment of the present invention, the light incident surface 123a of the light guide plate 123 corresponding to one edge where the LED assembly 129 is located is along the length direction of the light incident surface 123a ( A stopper 123g for maintaining an optical separation distance between the light incident surface 123a of 123 and the LED assembly 129 is provided.

That is, the width of the backlight unit 120 is referred to as an optical gap or an air gap, that is, the distance 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, thereby providing a high quality surface. A light source may be provided to the liquid crystal panel 110 .

In addition, a pad insertion portion 123h is formed at one corner of the light-receiving surface 123b, which is opposite to the light-receiving surface 123a provided with the stopper 123g, and the flow of the light guide plate 123 is formed in the pad insertion portion 123h. A pad 160 made of a translucent material for preventing is positioned.

A locking jaw 123i is provided on the light incident surface 123b where the pad insertion part 123h is located so that the upper surface 161 of the pad 160 inserted through the pad insertion part 123h is fixed in a pressed state. do.

Through this, the position of the light guide plate 123 according to the embodiment of the present invention is fixed within the modularized liquid crystal display through the pad 160 inserted into the pad insertion portion 123h and the locking jaw 123i, When the light guide plate 123 is accommodated in the lower cover 150, movement of the light guide plate 123 in a horizontal or vertical direction due to external impact or shaking is prevented.

Through this, it is possible to prevent the plurality of LEDs 129a from being damaged due to the flow of the light guide plate 123 .

Here, the pad 160 is formed to have a larger size than the pad insertion portion 123h. At this time, the pad 160 is formed such that the lower surface 163 facing the reflector 125 has a narrower width than the upper surface 161. To this end, the pad 160 has a lower surface 163 and a side surface 165 ) It is formed to have an inclined surface 167 inclined at a predetermined angle between them.

In the process of inserting the pad 160, which is formed to have a larger size than the pad insertion portion 123h, into the pad insertion portion 123h of the light guide plate 123, it is easier to insert the pad 160 into the light guide plate 123. This is to be inserted into the pad insertion portion 123h.

Further, the reflector 125 is positioned 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.

Through this, the position of the light guide plate 123 according to an embodiment of the present invention is fixed by the pad 160 and the locking jaw 123i in the modularized liquid crystal display device, so that movement can be prevented.

Therefore, it is possible to prevent a problem in which the optical characteristics of the liquid crystal display device is changed and the image quality is deteriorated. We will look into this in more detail later.

The optical sheet 121 on the upper part of the light guide plate 123 includes a diffusion sheet and at least one light collecting sheet, and diffuses or collects the light passing through the light guide plate 123 to provide a more uniform surface light source to the liquid crystal panel 110. to be admitted

The liquid crystal panel 110 and the backlight unit 120 are modularized through a top cover 140, a guide panel 130, and a bottom cover 150. It is configured to cover the sides.

Here, the top cover 140 has a cross section bent in an “a” shape to cover the top and side edges of the liquid crystal panel 110, and has a square frame shape, and the front surface of the top cover 140 is opened to cover the liquid crystal panel 110. ) is configured to display an image implemented in.

The guide panel 130 supports the edge of the liquid crystal panel 110 and has a square frame shape for surrounding the edge of the backlight unit 120, and includes a vertical portion 131 surrounding the side surface of the backlight unit 120 and a vertical portion ( 131) is provided with a horizontal portion 133 that divides the positions of the liquid crystal panel 110 and the backlight unit 120.

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

The guide panel 130 is seated on the lower cover 150, and the lower cover 150 includes a horizontal surface 151 and an edge portion 153 in which an edge of the horizontal surface 151 is vertically bent.

The guide panel 130, the lower cover 150, and the top cover 140 surround the edges of the liquid crystal panel 10 and the backlight unit 20 with the guide panel 130, and cover the upper edge of the liquid crystal panel 110. The top cover 140 that surrounds and the lower cover 150 that covers the back of the backlight unit 120 are combined from the front and rear, respectively, and are integrally modularized through the guide panel 130.

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

In the liquid crystal display having the above-described structure, the top cover 140 and the bottom cover 150 may be removed in order to implement a lightweight and thin liquid crystal display that has recently been demanded. By deleting the top cover 140 and the bottom cover 150, the liquid crystal display device can be made lighter and thinner, and has an effect of simplifying the process.

In addition, process costs may be reduced due to the deletion of the top cover 140 and the bottom cover 150 made of metal.

In the liquid crystal display device according to the embodiment of the present invention described above, a pad insertion part 123h is formed at one edge of the light-receiving surface 123b of the light guide plate 123, and the light-receiving surface 123b within the pad insertion part 123h ) is formed with a pad fixing part, for example, a locking jaw 123i, and the pad 160 is placed in the pad insertion part 123h to prevent the light guide plate 123 from moving. By fixing the upper surface 161 in a pressed state, the flow of the light guide plate 123 in the horizontal and vertical directions or the Z direction, that is, in the liquid crystal panel direction, can be prevented.

6 is a plan view of the arrangement of a light guide plate and a lower cover of a liquid crystal display according to an embodiment of the present invention.

FIG. 7 is an enlarged view of portion B of FIG. 6 , and is a plan view of a state in which a pad is inserted into a pad insertion portion of a light guide plate according to an embodiment of the present invention.

FIG. 8 is a cross-sectional view taken along line VIII-VIII of FIG. 7, and is a combined cross-sectional view of a liquid crystal display schematically showing a state in which the upper surface of a pad is pressed and fixed by a pad fixing part of a light guide plate according to an embodiment of the present invention.

6 to 8, a reflector 125 and a light guide plate 123 are sequentially disposed on the horizontal surface 151 of the lower cover 150. At this time, a pad insertion portion is provided at one corner of the light guide plate 123 123h is formed, and a pad 160 made of a translucent material is inserted into the pad insertion portion 123h.

The pad 160 is made of a translucent material and is formed to have a bar shape having a certain thickness, and the pad insertion portion 123h is formed to have the same shape as the pad 160 .

At this time, as the pad 160 is larger in size than the pad insertion portion 123h, the pad 160 and the pad insertion portion 123h overlap each other so that the light guide plate 123 is positioned where the pad 160 is located. It is fixed while being pushed diagonally from the corner.

Accordingly, the position of the light guide plate 123 of the present invention is fixed within the modularized liquid crystal display. In particular, as the light guide plate 123 is pushed in the diagonal direction of the pad 160 by the pad 160, the light entering surface 123b perpendicular to each other forms the corner where the pad insertion portion 123h of the light guide plate 123 is formed. And the side surface (123f) is to form a predetermined gap (G) and the edge portion 153 of the lower cover (150). At this time, the gap G formed between the light-receiving surface 123b and the side surface 123f of the light guide plate 123 and the edge 153 of the lower cover 150 is the light guide plate ( 123) serves to prevent flow due to expansion.

Here, it is preferable that the pad 160 is slightly larger than the pad insertion portion 123h.

If the size of the pad 160 is formed to be too large compared to the pad insertion portion 123h, it may be difficult to insert the pad 160 into the pad insertion portion 123h, and the size of the pad 160 may make it difficult to insert the pad 160 into the pad insertion portion 123h. When it has the same size as the portion 123h, the light guide plate 123 cannot be pushed in a diagonal direction from one corner where the pad 160 is located by the pad 160, so that the flow of the light guide plate 123 is not completely blocked.

As shown in FIG. 8, an LED assembly composed of a reflector 125, a light guide plate 123, an LED (129a in FIG. 5) and a PCB (129b in FIG. 5) on which the LED (129a in FIG. 5) is mounted ( Optical sheets 121 are stacked on top of 129 of FIG. 5 and the light guide plate 123 to form a backlight unit ( 120 of FIG. 5 ).

In addition, a liquid crystal panel 110 in which a liquid crystal layer (not shown) is interposed between the first and second substrates 112 and 114 is positioned above the backlight unit (120 in FIG. 5), and the first and second substrates 112 and 114 are positioned. A polarizer (not shown) that selectively transmits only specific light is attached to the outer surface of each of the two substrates 112 and 114.

Here, the liquid crystal panel 110 surrounded by the backlight unit 120 and the guide panel 130 is seated on the horizontal surface 151 of the lower cover 150, and the edge 153 of the lower cover 150 The outer surface of ) is positioned in close contact with the inner surface of the vertical portion 131 of the guide panel 130.

At this time, the liquid crystal panel 110 is attached and supported on the horizontal portion 133 of the guide panel 130 through an adhesive pad (not shown).

And, the top cover (not shown, see 140 in FIG. 5) covers the edge of the upper surface of the liquid crystal panel 110 and the guide panel 130 so that the side surface surrounds the outer side surface of the vertical portion 131 of the guide panel 130. are assembled with At this time, a pad 160 made of a translucent material is positioned in the pad insertion portion 123h formed at one corner of the light-receiving surface 123b of the light guide plate 123.

The upper surface 161 of the pad 160 inserted through the pad insertion part 123h is pressed and fixed to the light entrance surface 123b of the light guide plate 123 where the pad insertion part 123h is located. (123i) is provided.

Through this, the position of the light guide plate 123 according to an embodiment of the present invention is fixed in the modularized liquid crystal display device through the pad 160 inserted into the pad insertion portion 123h and the locking jaw 123i. In a state where the light guide plate 123 is accommodated in the lower cover 150, the movement of the light guide plate 123 in the horizontal and vertical directions or the Z direction, that is, in the liquid crystal panel direction, due to external shock or shaking is prevented.

Meanwhile, a liquid crystal display device according to another exemplary embodiment of the present invention will be described with reference to FIGS. 9 and 10 .

9 is a plan view of the arrangement of a light guide plate and a lower cover of a liquid crystal display device according to another embodiment of the present invention, schematically illustrating a state in which a pad is inserted into a pad insertion part of the light guide plate.

FIG. 10 is a cross-sectional view taken along line X-X of FIG. 9 in a state in which a pad is inserted into the pad insertion part of the light guide plate according to another embodiment of the present invention and is caught and fixed by the locking jaw of the lower cover.

9 and 10, a reflector 225 and a light guide plate 223 are sequentially disposed on a horizontal surface 251 of the lower cover 250. At this time, a pad insertion portion is provided at one corner of the light guide plate 223. 223h is formed, and a pad 260 made of a translucent material is inserted into the pad insertion portion 223h.

The pad 260 is made of a translucent material and is formed to have a bar shape having a certain thickness, and the pad insertion portion 223h is formed to have the same shape as the pad 260 .

At this time, as the pad 260 is larger in size than the pad insertion portion 223h, the light guide plate 223 is positioned where the pad 260 is due to the overlap between the pad 260 and the pad insertion portion 223h. It is fixed while being pushed diagonally from the corner.

Accordingly, the position of the light guide plate 223 of the present invention is fixed within the modularized liquid crystal display. In particular, as the light guide plate 223 is pushed in the diagonal direction of the pad 260 by the pad 260, the light-receiving surfaces 223b perpendicular to each other form the corner where the pad insertion portion 223h of the light guide plate 123 is formed. And the side surface (223f) is to form a predetermined gap (G) with the edge portion 253 of the lower cover (250). At this time, the gap G formed between the light-receiving surface 223b and the side surface 223f of the light guide plate 223 and the edge 253 of the lower cover 250 is the light guide plate by the high-temperature heat generated when the liquid crystal display is driven ( 223) to prevent flow due to expansion.

Here, it is preferable that the pad 260 is slightly larger than the pad insertion portion 223h.

Also, if the size of the pad 260 is too large compared to the pad insertion portion 223h, it may be difficult to insert the pad 260 into the pad insertion portion 223h, and the size of the pad 260 If has the same size as the pad insertion portion 223h, the light guide plate 223 cannot be pushed in a diagonal direction from one corner where the pad 260 is located by the pad 260, preventing the light guide plate 223 from completely blocking the flow. do.

As shown in FIG. 10, an LED assembly composed of a reflector 225, a light guide plate 223, an LED (129a in FIG. 5) and a PCB (129b in FIG. 5) on which the LED (129a in FIG. 5) is mounted ( Optical sheets 221 are stacked on 129 of FIG. 5 and the light guide plate 223 to form the backlight unit 220 .

In addition, a liquid crystal panel 210 having a liquid crystal layer (not shown) interposed between the first and second substrates 212 and 214 and the liquid crystal panel 210 is positioned above the backlight unit 220, and the first and second substrates ( 212, 214) is attached to the outer surface of each polarizer (not shown) that selectively transmits only specific light.

Here, the liquid crystal panel 210 surrounded by the backlight unit 220 and the guide panel 230 is seated on the horizontal surface 251 of the lower cover 250, and the edge 253 of the lower cover 250 The outer surface of ) is positioned in close contact with the inner surface of the vertical portion 231 of the guide panel 230. At this time, the liquid crystal panel 210 is attached and supported on the horizontal portion 233 of the guide panel 230 through an adhesive pad (not shown).

And, the top cover (not shown, see 240 in FIG. 5) covers the upper edge of the liquid crystal panel 210 and the guide panel 230 so that the side surface surrounds the outer side surface of the vertical portion 231 of the guide panel 230. are assembled with At this time, a pad 260 made of a translucent material is positioned in the pad insertion portion 223h formed at one corner of the light-receiving surface 223b of the light guide plate 223.

The upper surface 261 of the pad 260 inserted through the pad insertion portion 223h is pressed and fixed to the edge portion 153 of the lower cover 250 to which the pad insertion portion 123h is in contact. A cover locking jaw 255 is provided.

Through this, the light guide plate 223 according to another embodiment of the present invention is a modular liquid crystal display device through the pad insertion portion 223h and the pad 260 inserted into the cover locking jaw 255 of the lower cover 250. The position of the light guide plate 223 is fixed within the lower cover 250, and the light guide plate 223 moves in the horizontal and vertical directions or in the Z direction, that is, in the direction of the liquid crystal panel, by external impact or shaking. will prevent

Meanwhile, a liquid crystal display device according to another exemplary embodiment of the present invention will be described with reference to FIGS. 11 and 12 .

11 is a plan view of the arrangement of a light guide plate and a lower cover of a liquid crystal display device according to another embodiment of the present invention, schematically illustrating a state in which a pad is inserted into a pad insertion part of the light guide plate.

FIG. 12 is a cross-sectional view taken along line XII-XII of FIG. 11, in a state in which a protrusion of a pad according to another embodiment of the present invention is inserted into a pad fixing part of a light guide plate.

11 and 12, a reflector 325 and a light guide plate 323 are sequentially disposed on a horizontal surface 351 of the lower cover 350. At this time, a pad insertion portion is provided at one corner of the light guide plate 323. 323h is formed, and a pad 360 made of a translucent material is inserted into the pad insertion portion 323h.

The pad 360 is made of a translucent material and is formed to have a bar shape having a certain thickness, and the pad insertion portion 323h is formed to have the same shape as the pad 360 .

At this time, as the pad 360 is larger in size than the pad insertion portion 323h, the pad 360 and the pad insertion portion 323h overlap each other so that the light guide plate 323 is positioned where the pad 360 is located. It is fixed while being pushed diagonally from the corner.

Accordingly, the position of the light guide plate 323 of the present invention is fixed within the modularized liquid crystal display. In particular, as the light guide plate 323 is pushed in the diagonal direction of the pad 360 by the pad 360, the light entering surface 323b perpendicular to each other forming the corner where the pad insertion portion 323h of the light guide plate 323 is formed And the side surface (123f) is to form a predetermined gap (G) and the edge portion 153 of the lower cover (150). At this time, the gap G formed between the light-receiving surface 123b and the side surface 123f of the light guide plate 123 and the edge 153 of the lower cover 150 is the light guide plate ( 123) serves to prevent flow due to expansion.

Here, it is preferable that the pad 160 is slightly larger than the pad insertion portion 323h.

If the size of the pad 360 is too large compared to the pad insertion portion 323h, it may be difficult to insert the pad 360 into the pad insertion portion 323h. When the portion 323h has the same size, the light guide plate 323 cannot be pushed in a diagonal direction from one corner where the pad 360 is located by the pad 360, so that the flow of the light guide plate 323 is not completely blocked.

As shown in FIG. 12, an LED assembly composed of a reflector 325, a light guide plate 323, an LED (129a in FIG. 5) and a PCB (129b in FIG. 5) on which the LED (129a in FIG. 5) is mounted ( Optical sheets 321 are stacked on top of 129 in FIG. 5 and the light guide plate 323 to form a backlight unit (320 in FIG. 5 ).

In addition, the first and second substrates 312 and 314 and a liquid crystal panel 310 having a liquid crystal layer (not shown) interposed therebetween are positioned above the backlight unit (120 in FIG. 5), A polarizing plate (not shown) that selectively transmits only specific light is attached to the outer surfaces of the two substrates 312 and 314, respectively.

Here, the liquid crystal panel 310 surrounded by the backlight unit 320 and the guide panel 330 is seated on the horizontal surface 351 of the lower cover 350, and the edge 353 of the lower cover 350 The outer surface of ) is positioned in close contact with the inner surface of the vertical portion 331 of the guide panel 330.

At this time, the liquid crystal panel 310 is attached and supported on the horizontal portion 333 of the guide panel 330 through an adhesive pad (not shown).

And, the top cover (not shown, see 140 in FIG. 5) covers the upper edge of the liquid crystal panel 310 and the guide panel 330 so that the side surface surrounds the outer side surface of the vertical portion 331 of the guide panel 330. are assembled with At this time, a pad 360 made of a translucent material is positioned in the pad insertion portion 323h formed at one edge of the light-receiving surface 323b of the light guide plate 323.

Protrusions 369 provided on the side surfaces of the pads 360 inserted through the pad insertion parts 323h are inserted into and fixed to the light incident surface 323b of the light guide plate 323 where the pad insertion parts 323h are located. An insertion groove 223i is provided.

Through this, the position of the light guide plate 323 according to an embodiment of the present invention is fixed within the modularized liquid crystal display through the pad 360 inserted into the pad insertion portion 223h and the protrusion insertion groove 223i. Accordingly, when the light guide plate 323 is stored in the lower cover 350, the light guide plate 323 is prevented from moving in the horizontal and vertical directions or in the Z direction, that is, in the liquid crystal panel direction, due to external impact or shaking.

As described above, the liquid crystal display device according to the present invention forms a protruding shape at the end of the light guide plate or the inner edge of the lower cover so that the pad flows in the Z direction, that is, the liquid crystal panel direction, due to contraction and expansion shock even in extreme environments. By preventing this, it is possible to maintain a continuous insertion state in the panel insertion groove.

In particular, the pad continuously fixes the light guide plate without falling out in the Z direction, i.e., the direction of the liquid crystal panel, even in an extreme environment by the locking jaw or protrusion insertion groove of the light guide plate or the cover locking jaw of the lower cover, thereby reducing noise and damage caused by the flow of the light guide plate. In addition, it is possible to prevent the change in optical characteristics.

In addition, in the liquid crystal display device according to the present invention, a protrusion is formed on a pad used to prevent the light guide plate from moving, or a locking step or protrusion insertion groove is formed to fix the pad to the light guide plate or lower cover to insert the pad of the light guide plate. By preventing the pad from falling out in the Z direction, that is, in the direction of the liquid crystal panel, it is possible to prevent the flow of other fixtures.

On the other hand, those skilled in the art pertaining to the present invention will be able to understand that the present invention can be embodied in other specific forms without changing its technical spirit or essential features. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not limiting.

The scope of the present invention is indicated by the following claims rather than the detailed description above, and all changes or modifications derived from the meaning and scope of the claims and equivalent concepts should be construed as being included in the scope of the present invention. do.

123: light guide plate 123a: light incident surface
123b: light-receiving surface 123h: pad insertion portion
123i: locking jaw 130: guide panel
150: lower cover 160: pad

Claims (12)

a light guide plate having a pad insertion part provided at one corner of the light-receiving surface, and a pad fixing part provided in the pad insertion part;
a pad inserted into the pad insertion part and hooked and fixed to the pad fixing part;
a reflector positioned below the light guide plate;
an LED assembly attached along the light incident surface of the light guide plate;
an optical sheet seated on the light guide plate;
a liquid crystal panel seated on top of the optical sheet;
a lower cover positioned below the light guide plate and having a horizontal surface and an edge portion perpendicular to the horizontal surface; and
In addition to the lower cover, a guide panel for integrating the light guide plate, the reflector, the optical sheet, and the liquid crystal panel is included,
The pad fixing part is formed at a position where the upper surface of the pad is pressed and fixed among the pad insertion parts. The liquid crystal display device of claim 1 , wherein a size of the pad is larger than a size of the pad insertion part, the pad has a bar shape, and a lower surface facing the reflector has a narrower width than an upper surface facing the liquid crystal panel. . The liquid crystal display device of claim 1 , wherein an upper surface of the pad is hooked and fixed to a light-receiving surface of a light guide plate in the pad inserting part of the pad fixing part. delete The liquid crystal display device of claim 1 , wherein a cover locking jaw protrudes from an inner edge of the lower cover so that the upper surface of the pad is hooked and fixed. a light guide plate having a pad insertion part provided at one corner of the light-receiving surface, and a pad fixing part provided in the pad insertion part;
a pad provided with a protrusion inserted into the pad insertion part and hooked and fixed to the pad fixing part;
a reflector positioned below the light guide plate;
an LED assembly attached along the light incident surface of the light guide plate;
an optical sheet seated on the light guide plate;
a liquid crystal panel seated on top of the optical sheet;
a lower cover positioned below the light guide plate and having a horizontal surface and an edge portion perpendicular to the horizontal surface; and
In addition to the lower cover, a guide panel for integrating the light guide plate, the reflector, the optical sheet, and the liquid crystal panel is included,
The pad fixing part has a shape of an insertion groove so that the protrusion provided on the side surface of the pad can be inserted and fixed. 7 . The liquid crystal display device of claim 6 , wherein the pad fixing part is provided in the form of the protrusion insertion groove on an inner side of a carrying-in surface of the light guide plate in the pad insertion part. delete delete delete delete delete

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