KR102068959B1 - 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 that can prevent the flow of the guide panel.
A feature of the present invention is that the cover bottom and the guide panel are assembled and fastened through a hook-type fastening method, so that a liquid crystal display device having a narrow bezel can be realized by not using a fixing member such as a screw (not shown). have.
This can reduce process costs and improve the efficiency of the process.
In particular, the liquid crystal display of the present invention includes a locking portion at the cover bottom and a fastening portion corresponding to the locking portion in the guide panel, thereby preventing the light guide plate from flowing and at the same time shrinking and expanding due to the material characteristics of the guide panel. When generated, the flow of the guide panel can also be prevented.
As a result, the flow of the light guide plate due to the flow of the guide panel can be prevented, and thus, a plurality of LEDs of the LED assembly may be damaged, or the optical characteristics of the liquid crystal display may be changed, resulting in deterioration in image quality. It can be prevented from occurring.

Description

Liquid crystal display device

The present invention relates to a liquid crystal display device, and more particularly to a liquid crystal display device that can prevent the flow of the guide panel.

Liquid crystal display devices (LCDs), which are used for TVs and monitors due to their high contrast ratio and are advantageous for displaying moving images, are characterized by optical anisotropy and polarization of liquid crystals. The principle of image implementation by

Such a liquid crystal display is an essential component of a liquid crystal panel, which is bonded between two substrates in parallel with a liquid crystal layer, and realizes a difference in transmittance by changing an arrangement direction of liquid crystal molecules with an electric field in the liquid crystal panel. do.

However, since the liquid crystal panel does not have its own light emitting element, a separate light source is required to display the difference in transmittance as an image, and for this purpose, a backlight having a light source embedded therein is disposed on the back 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) as a light source.

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

Meanwhile, a general backlight unit is classified into a direct type method and an edge type method according to an arrangement of lamps. In the edge type method, one or a pair of light sources is provided with one or two or two pairs of light guide plates. The light source has a structure in which both sides of the light guide plate are disposed, and the direct type has a structure in which several light sources are disposed below the liquid crystal panel.

Here, the direct type has a limitation in thinning, and is mainly used in a liquid crystal display device in which brightness is more important than the thickness of the screen, and the edge type which is lighter and thinner than the direct type is such as a notebook PC or a monitor PC. It is mainly used in liquid crystal displays where thickness is important.

1 is a cross-sectional view of a liquid crystal display including a general edge type backlight unit using LED as a light source.

As illustrated, the LCD including the backlight unit 20 of the general edge type has a liquid crystal panel 10 and a backlight unit 20, and 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 interposed therebetween.

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

The backlight unit 20 is arranged along at least one side edge length direction of the guide panel 30, and includes a plurality of LEDs 29a and a PCB 29b on which the LEDs 29a are mounted. A white or silver reflector 25 mounted on the bottom 50, a light guide plate 23 seated on the reflector 25, and an optical sheet 21 positioned thereon.

The liquid crystal panel 10 and the backlight unit 20 have a top cover 40 covering the top edge of the liquid crystal panel 10 and the back of the backlight unit 20 with the edges surrounded by the rectangular guide panel 30. Cover cover 50 to cover each is coupled in front and rear are integrated through the guide panel 30.

In addition, reference numerals 19a and 19b denote polarizers attached to the front and rear surfaces of the liquid crystal panel 10 to control the polarization direction of light, respectively.

On the other hand, such a liquid crystal display device is to fasten the guide panel 30 and the cover bottom 50 through a fixing member (not shown), such as a screw, the guide panel 30 by using such a screw (not shown) When the cover bottom 50 is fastened with a light weight, a thin, and narrow bezel (Narrow bezel) of the liquid crystal display device that is recently required is difficult to implement.

In addition, the image quality of the liquid crystal panel 10 may be deteriorated due to the foreign matter generated when the screw (not shown) is fastened, and the process cost increases due to the increase in the number of parts due to the screw (not shown). , Screw (not shown) will cause time and operator's process inconvenience.

Accordingly, in recent years, the guide panel 30 and the cover bottom 50 are fastened by a hook type fastening method without using a fixing member such as a screw (not shown), but the hook type fastening method is performed. Method has a problem that can not prevent the flow due to shrinkage and expansion by the material characteristics of the guide panel 30.

The flow of the guide panel 30 causes the light guide plate 23 to flow, and thus, the breakage of the plurality of LEDs 29a of the LED assembly 29 occurs, or the optical characteristics of the liquid crystal display are changed, thereby improving image quality. This causes a deterioration problem.

The present invention has been made to solve the above problems, and a first object of the present invention is to provide a liquid crystal display device having a light weight, a thin shape, and a narrow bezel.

In addition, the second purpose is to prevent the flow of the guide panel to occur, and the third purpose is to prevent the flow of the light guide plate through this.

For this reason, the third object is to improve the brightness and the image quality of the liquid crystal display.

In order to achieve the above object, the present invention is a liquid crystal panel; A backlight unit positioned on a rear surface of the liquid crystal panel; A cover bottom on which the backlight unit is seated, a fastening protrusion is provided at an outer side of a side surface, and a locking part is provided at an inner side of the side surface; A first vertical portion having a fastening hole for inserting the fastening protrusions around the edge of the backlight unit, a horizontal portion bent vertically from the first vertical portion to support the liquid crystal panel, and a lower portion of the horizontal portion; Provided is a liquid crystal display including a guide panel having a fastening portion.

At this time, the fastening portion is vertically bent from the horizontal portion and consists of first and second side surfaces parallel to each other at both ends of the second vertical portion facing the first vertical portion and the longitudinal direction of the second vertical portion. The first and second side surfaces are spaced apart from the first vertical portion by a predetermined distance.

The locking portion is inserted into a space defined by the first and second vertical portions and the first and second side surfaces, and the locking portion includes a first jaw vertically inward from the side surface, and the first jaw portion. And a second jaw perpendicular to the jaw and not facing the side surface, the outer surface of the side being in close contact with the inner surface of the first vertical portion, and the second jaw being in close contact with the inner surface of the second vertical portion.

The backlight unit includes a light guide plate having a guide groove at an edge thereof, the fastening portion is inserted into the guide groove, and the guide groove is in close contact with an outer surface of the second vertical portion.

The width between the first and second side surfaces corresponds to the width of the locking portion, and the width between the first vertical portion and the second vertical portion corresponds to the width of the first jaw of the locking portion.

In this case, the backlight unit includes an LED assembly and an optical sheet.

As described above, by assembling and fastening the cover bottom and the guide panel through a hook type fastening method according to the present invention, a liquid crystal display device having a narrow bezel can be realized by not using a fixing member such as a screw. Can be.

Through this, it is possible to prevent an increase in the material cost due to the consumption of the fixing member such as a screw, and to prevent the problem that the image quality of the liquid crystal panel is deteriorated by foreign substances generated when the fixing member such as the screw is fastened. The modularity of the device has the effect of minimizing waste of time, money and manpower.

In particular, the liquid crystal display of the present invention includes a locking portion at the cover bottom and a fastening portion corresponding to the locking portion in the guide panel, thereby preventing the flow of the light guide plate, and at the same time, shrinkage and expansion due to the material characteristics of the guide panel. Even if it occurs, there is an effect that can also prevent the flow of the guide panel.

Through this, there is an effect that can prevent the flow of the light guide plate due to the flow of the guide panel, thereby causing a breakage of a plurality of LEDs of the LED assembly, or the optical characteristics of the liquid crystal display device is changed to deteriorate the image quality There is an effect that can be prevented from occurring.

1 is a cross-sectional view of a liquid crystal display including a backlight unit of a general edge type method using an LED as a light source.
2 is an exploded perspective view of a liquid crystal display according to an exemplary embodiment of the present invention.
Figure 3a is a rear perspective view schematically showing a guide panel according to an embodiment of the present invention.
FIG. 3B is an enlarged view of A of FIG. 3A; FIG.
Figure 4a is a perspective view schematically showing a cover bottom according to an embodiment of the present invention.
4B is an enlarged view of a portion B of FIG. 4A.
Figure 4c is a cross-sectional view schematically showing a cross section of the locking portion of the cover bottom.
5a to 5e are exploded perspective views schematically showing the fastening of the guide panel and the cover bottom.
6a to 6b are a perspective view and a front view schematically showing the coupling state of the guide panel and the cover bottom.

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

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

As shown, the liquid crystal display according to the present invention includes a liquid crystal panel 110 and a backlight unit 120 stacked up and down, and the guide panel 130 and the cover bottom 150 as mechanical elements for integrating them. Is provided.

In this case, for convenience of description, the direction on the drawing is defined, and the backlight unit 120 is disposed behind the liquid crystal panel 110 under the premise that the display surface of the liquid crystal panel 110 faces the front, The cover bottom 150, which is in close contact with the back surface of the backlight unit 120 in a state in which the rectangular frame-shaped guide panel 130 is worn, is integrated by being integrated in front and rear.

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

First, the liquid crystal panel 110 plays a key role in the image expression of the liquid crystal display device. The liquid crystal layer interposed therebetween with the first and second substrates 112 and 114 bonded to each other. (Not shown).

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

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

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

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

Along the edge of the liquid crystal panel 110, the printed circuit board 117 is connected through a connecting member 116 such as a flexible printed circuit board or a tape carrier package (TCP) to guide the module in the modularization process. The side of the panel or the cover bottom 150 is properly folded to be in close contact.

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

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

The backlight unit 120 includes a white or silver reflecting plate 125, a LED assembly 129 arranged along one longitudinal edge thereof, a light guide plate 123 mounted on the reflecting plate 125, and an upper portion of the light guide plate 123. It consists of an optical sheet 121 seated on.

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, The plurality of LEDs 129a includes a PCB 129b mounted at regular intervals.

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

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

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

The light guide plate 123 to which 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 LED 129a travels through the light guide plate 123 by a plurality of total reflections. Spread provides a surface light source to the liquid crystal panel (110).

The light guide plate 123 has excellent transparency, weather resistance, and colorability to induce light diffusion when light is transmitted.

The light guide plate 123 is one selected from a plastic material such as polymethylmethacrylate (PMMA), which is one of transparent materials capable of transmitting light, or a polycarbonate (PC) series. It can be manufactured, PMMA which is excellent in transparency, weather resistance, colorability to induce the diffusion of light when light is transmitted is the most widely used.

In addition, the light guide plate 123 may include a pattern having a specific shape on the rear surface to supply a uniform surface light source. Here, the pattern may be configured in various ways such as an elliptical pattern, a polygon pattern, a hologram pattern, and the like 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.

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

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

The liquid crystal panel 110 and the backlight unit 120 are modularized through the guide panel 130 and the cover bottom 150. The cover bottom 150 includes the backlight unit 120 including the liquid crystal panel 110 mounted thereon. It provides a horizontal plane 151 to support the entire liquid crystal display and at the same time serves as a lower frame to minimize the loss of light, the edge of the horizontal plane 151 is vertically bent to form a side 153.

In addition, a rectangular frame-shaped guide panel 130 seated on the cover bottom 150 and surrounding the edge of the backlight unit 120 is coupled to the cover bottom 150.

Here, the guide panel 130 divides the positions of the liquid crystal panel 110 and the backlight unit 120 into the first vertical portion 131 and the first vertical portion 131 surrounding the side surface of the backlight unit 120. The horizontal portion 133 is provided, and the liquid crystal panel 110 is attached and fixed on the horizontal portion 133 through an adhesive pad (not shown) such as a double-sided tape.

Through this, the liquid crystal panel 110 and the backlight unit 120 are integrally modularized.

The liquid crystal display device of the present invention implements a narrow bezel, which realizes light weight and thinness, and has a wide display area and a bezel area that is a non-display area other than the display area as small as possible. .

In this case, the cover bottom 150 serves to prevent shaking of the modular liquid crystal display and maintain a stable fixed state. To this end, a plurality of fastenings are provided on the outer surfaces of the four sides 153 of the cover bottom 150. The protrusion 155 is formed to protrude.

At this time, it is preferable that at least two fastening protrusions 155 are provided along the longitudinal direction of the side surface 153 of the cover bottom 150.

In addition, the outer side of the first vertical portion 131 of the guide panel 130 is formed with a fastening hole 135 into which the fastening protrusion 155 formed on the outer surface of the four side surfaces 153 of the cover bottom 150 is inserted. It is.

Thus, the guide panel 130 and the cover bottom 150 are assembled and fastened to each other.

At this time, the inside of the guide panel 130 is provided with a fastening portion 210 (see FIG. 3A) which is assembled and fastened with the cover bottom 150 while preventing the flow of the light guide plate 123, and the fastening portion 210 (FIG. 3A). In response, the engaging portion 220 is provided inside the cover bottom 150.

Therefore, it is possible to prevent the flow of the guide panel 130 due to the contraction and expansion of the guide panel 130 while preventing the flow of the light guide plate 123.

Through this, the flow of the light guide plate 123 due to the flow of the guide panel 130 may also be prevented, thereby causing a breakage of a plurality of LEDs 129a of the LED assembly 129 or optical characteristics of the liquid crystal display device. This can prevent the problem of deterioration of the image quality.

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

The liquid crystal display according to the exemplary embodiment of the present invention has a structure in which the top cover (40 of FIG. 1) is deleted, and thus, the light weight, thinness, and narrow bezel of the liquid crystal display can be achieved by removing the top cover (40 of FIG. 1). It has an effect that can simplify the process.

In addition, due to the deletion of the top cover 40 of FIG. 1, the process cost may be reduced.

In the liquid crystal display according to the exemplary embodiment of the present invention, the fastening part 210 (see FIG. 3A) which can prevent the flow of the light guide plate 123 to the guide panel 130 while preventing the flow of the guide panel 130 is referred to. ) Is further provided, and correspondingly, the locking portion 220 is further formed on the cover bottom 150, thereby preventing the flow of the light guide plate 123 and at the same time shrinking and contracting due to the material characteristics of the guide panel 130. Even when expansion occurs, the flow of the guide panel 130 may also be prevented.

As a result, the flow of the light guide plate 123 due to the flow of the guide panel 130 may be prevented, and thus, the breakage of the plurality of LEDs 129a of the LED assembly 129 may occur or the liquid crystal display may be prevented. It is possible to prevent the problem that the optical characteristics of the device is changed to deteriorate the image quality.

3A is a rear perspective view schematically illustrating a guide panel according to an embodiment of the present invention, and FIG. 3B is an enlarged view of A of FIG. 3A.

As shown, the guide panel 130 covering the edge of the backlight unit (120 of Figure 2) is made of a synthetic resin mold material, such as polycarbonate, and the edge of the backlight unit (120 of Figure 2) The first vertical part 131 and the first vertical part 131 vertically protrudes inwards and includes a horizontal part 133 on which the liquid crystal panel 110 (see FIG. 2) is seated.

Looking at this in more detail, the guide panel 130 is configured by injection molding method through a synthetic resin in a rectangular frame shape, the guide panel 130 is the first to fourth edge portion (130a, 130b, 130c, 130d) The first to fourth edge portions 130a, 130b, 130c, and 130d may be perpendicular to the first vertical portion 131 and the first vertical portion 131 that surround the edge of the backlight unit 120 of FIG. 2. The horizontal unit 133 distinguishes the positions of the backlight unit 120 of FIG. 2 and the liquid crystal panel 110 of FIG. 2.

Therefore, the guide panel 130 is formed in a rectangular frame shape bent in the form of "b".

In this case, the liquid crystal panel 110 (see FIG. 2) is seated and supported on the horizontal portion 133.

That is, the backlight unit includes a reflector plate (125 in FIG. 2), a light guide plate (123 in FIG. 2), an optical sheet (121 in FIG. 2), and an LED assembly (129 in FIG. 2) inside the first vertical portion 131. 2 (120) is mounted, and the first vertical portion 131 surrounds the edge thereof.

In addition, a liquid crystal panel 110 (see FIG. 2) is positioned above the horizontal portion 133 vertically bent from the first vertical portion 131, and a portion of four rear edges of the liquid crystal panel 110 of FIG. The position is fixed by being seated and supported).

In addition, a fastening hole 135 for assembling and fastening with the cover bottom (150 in FIG. 2) is formed in the first vertical portion 131.

At this time, the guide panel 130 of the present invention is further provided with a fastening portion 210 in the lower portion of the horizontal portion 133, the fastening portion 210 is perpendicular to the horizontal portion 133 to the lower side of the horizontal portion 133. And the first and second side surfaces 213a parallel to each other at both ends in the longitudinal direction of the second vertical portion 211 and the second vertical portion 211 formed to face the first vertical portion 131. 213b).

Accordingly, the fastening part 210 of the guide panel 130 defines a predetermined space inward through the first and second vertical parts 131 and 211 and the first and second side surfaces 213a and 213b.

As the locking portion (220 of FIG. 2) of the cover bottom (150 of FIG. 2) is inserted into a predetermined space defined by the fastening portion 210, shrinkage and expansion occur due to the material characteristics of the guide panel 130. Even if it can also prevent the flow of the guide panel 130. We will discuss this in more detail later.

At this time, the light guide plate 123 of FIG. 2 is guided through the outer side of the fastening part 210, that is, the second vertical part 211 and the first and second side surfaces 213a and 213b to guide the light guide plate (see FIG. 2). 123) to prevent the flow.

That is, a guide groove (123a in FIG. 2) is formed at an edge of the light guide plate (123 in FIG. 2) corresponding to the fastening portion 210, and the fastening portion 210 is inserted into the guide groove (123a in FIG. 2). (123 in Fig. 2) its position is fixed. Accordingly, the light guide plate 123 of FIG. 2 is fixed in a modular liquid crystal display device, and the light guide plate 123 of FIG. 2 is exposed to external shock or shaking in a state where the edge of the light guide plate is guided by the guide panel 130. As a result, the light guide plate 123 of FIG. 2 is prevented from flowing in the horizontal or vertical direction.

Through this, the plurality of LEDs (129a of FIG. 2) may be prevented from being damaged by the flow of the light guide plate (123 of FIG. 2), and the optical characteristics of the liquid crystal display may be changed to prevent the problem of deterioration in image quality. .

In this case, the first and second side surfaces 213a and 213b are formed to be spaced apart from the first vertical portion 131 by a predetermined distance d, so that the fastening portion 210 may have a kind of spring in the X-axis direction defined in the drawing. It will have the same elastic restoring force. Therefore, when external pressure is applied, the fastening part 210 has fluidity within a predetermined range.

Therefore, even if an impact is applied to the modular liquid crystal display from the outside, the fastening portion 210 has fluidity within a certain range, so that vibration and shock are absorbed by the fluidity even if vibration and shock are applied by any pressure. As a result, breakage of the light guide plate 123 of FIG. 2 can be prevented from occurring.

And, the second vertical portion 211 of the fastening portion 210 is formed to become thinner toward the end perpendicular to the longitudinal direction, the guide groove of the fastening portion 210 and the light guide plate (123 of FIG. 2) (FIG. 2) The contact area of 123a) is minimized.

That is, as the fastening part 210 is inserted into the guide groove (123a of FIG. 2) of the light guide plate (123 of FIG. 2), the guide groove (123a of FIG. 2) and the fastening part 210 of the light guide plate (123 of FIG. 2). 2) the second vertical portion 211 is partially in contact with the light guide plate (FIG. 2) as the guide groove (123a of FIG. 2) of the light guide plate 123 of FIG. 2 comes into contact with the second vertical portion 211. In the guide groove (123a of FIG. 2) of 123), it appears darker than other areas.

Therefore, the contact area between the second vertical portion 211 of the fastening part 210 and the guide groove (123a of FIG. 2) of the light guide plate 123 of FIG. 2 may be minimized, thereby minimizing the above phenomenon. .

Such a configuration of the cover bottom (150 of FIG. 2) that is assembled and fastened with the guide panel 130 of the present invention will be described in more detail with reference to FIGS. 4A to 4C.

4A is a perspective view schematically showing a cover bottom according to an embodiment of the present invention, FIG. 4B is an enlarged view of B of FIG. 4A, and FIG. 4C is a cross-sectional view schematically showing a cross section of a locking portion of the cover bottom. .

As shown, the cover bottom 150 according to the embodiment of the present invention has a rectangular plate shape having a side surface 153 whose edge is vertically bent, and has a horizontal surface closely attached to the rear surface of the backlight unit 120 (FIG. 2). 151 and its edge consists of a side 153 vertically bent upwards.

The backlight unit (120 of FIG. 2), the edge of which is guided by the guide panel (130 of FIG. 3A), is seated and supported on the cover bottom 150.

At this time, corresponding to the fastening hole (135 of FIG. 3A) formed in the first vertical portion (131 of FIG. 3A) of the guide panel (130 of FIG. 3A), the outer surface of the side surface 153 of the cover bottom 150 A plurality of fastening protrusions 155 are formed to protrude.

In addition, the cover bottom 150 of the present invention corresponds to the fastening portion 210 of FIG. 3A of the guide panel 130 of FIG. 3A, and a part of the side surface 153 and the horizontal surface 151 of the cover bottom 150 is inward. The locking portion 220 formed in the indented form is further formed.

That is, the engaging portion 220 is a part of the side surface 153 is perpendicular to the first jaw 221 and the first jaw 221 vertically inward from the side surface 153 to the inside of the side surface 153 and the side surface ( The second jaw 223 is formed so as not to face the 153 and the horizontal surface 151 extending vertically from the second jaw 223.

Thus, the locking portion 220 has a stepped cross section.

Therefore, the engaging portion 220 of the cover bottom 150 is inserted into the fastening portion (210 in FIG. 3 a) of the guide panel (130 of FIG. 3 a) of the present invention, and the cover bottom 150 is the guide panel (FIG. 3 a). Even if shrinkage and expansion are caused by the material properties of 130), the flow of the guide panel (130 of FIG. 3A) is prevented.

This will be described in more detail with reference to FIGS. 5A to 5E and 6A to 6B.

5A to 5E are exploded perspective views schematically illustrating a fastening pattern of the guide panel and the cover bottom, and FIGS. 6A to 6B are perspective views and a front view schematically showing the fastening state of the guide panel and the cover bottom.

As shown in FIGS. 5A and 5E, the reflection plate 125 is seated on the horizontal surface 151 of the cover bottom 150, and the light guide plate 123 and the guide panel 130 are sequentially disposed on the reflection plate 125. Located.

At this time, the fastening protrusion 155 is formed to protrude outward from the side 153 of the cover bottom 150, the fastening protrusion 155 protrudes to have a predetermined slope from the side 153 of the cover bottom 150, The lower end surface 155a is provided.

In addition, the inner side of the cover bottom 150 is provided with a locking portion 220 having a side 153 and the horizontal surface 151 of the cover bottom 150 indented inward.

The engaging portion 220 is a part of the side surface 153 facing the side surface 153 and perpendicular to the first jaw 221 and the first jaw 221 vertically from the side surface 153 to the inside of the side surface 153. The second jaw 223 and the second jaw 223 is formed so as not to consist of a horizontal surface 151 extending vertically.

The fastening hole into which the fastening protrusion 155 provided on the side 153 of the cover bottom 150 is inserted into the first vertical portion 131 of the guide panel 130 assembled and fastened with the cover bottom 150. 135 is formed.

In addition, a second vertical portion facing the first vertical portion 131 is perpendicular to the horizontal portion 133 and the horizontal portion 133 perpendicular to the first vertical portion 131 and to the inner side of the first vertical portion 131. A fastening part 210 including first and second side surfaces 213a and 213b provided at both ends of the part 211 and the second vertical part 211 is provided.

In this case, the fastening part 210 formed inside the first vertical part 131 of the guide panel 130 may include the first and second vertical parts 131 and 211, the horizontal part 133, and the first and second side surfaces. Predetermined spaces are defined internally by 213a and 213b.

Accordingly, as shown in FIG. 6A, the light guide plate 123 is seated on the reflective plate 125 mounted on the horizontal surface 151 of the cover bottom 150, and the guide panel 130 is formed at the edge of the light guide plate 123. The cover panel 150 is moved from the upper side to the lower side so that the inner surface of the first vertical portion 131 of the guide panel 130 is in close contact with the outer surface of the side surface 153 of the cover bottom 150. The cover cover 150 and the guide panel 130 are assembled and fastened to each other by pushing from the lower side to the upper side).

At this time, the fastening protrusion 155 of the cover bottom 150 is inserted into the fastening hole 135 of the guide panel 130, and the fastening protrusion 155 inserted into the fastening hole 135 is the stepped surface 155a. It is engaged with the fastening hole 135 of the guide panel 130.

Through this, the guide panel 130 and the cover bottom 150 are assembled and fastened to each other.

The first and second vertical parts 131 and 211 and the horizontal part 133 of the fastening part 210 formed inside the first vertical part 131 of the guide panel 130 and the first and second side surfaces thereof. The locking portion 220 of the cover bottom 150 is inserted into a predetermined space defined by the inner portions 213a and 213b.

Here, looking at the fastening method of the fastening part 210 and the fastening part 220 in more detail, in the state in which the fastening part 210 of the guide panel 130 and the fastening part 220 of the cover bottom 150 are aligned. The locking portion 220 of the cover bottom 150 is inserted into a predetermined space of the fastening portion 210 of the guide panel 130.

At this time, the outer surface of the side surface 153 of the locking portion 220 of the cover bottom 150 is in close contact with the inner surface of the first vertical portion 131 of the guide panel 130, the second jaw of the locking portion 220 The 223 is in close contact with the inner surface of the second vertical portion 211 of the guide panel 130.

Here, the first width w1 between the first and second side surfaces 213a and 213b, which is the width in the longitudinal direction of the second vertical portion 211 of the fastening portion 210 into which the locking portion 220 is inserted, is locked. It is preferable to correspond to the second width w2 of the locking portion 220 so that the portion 220 can be inserted tightly, and a third portion between the first vertical portion 131 and the second vertical portion 211 is provided. The width w3 is preferably formed to correspond to the fourth width w4, which is the width of the first jaw 221 of the locking portion 220.

Therefore, the guide panel 130 is flowable in the X-axis direction and the Z-axis direction defined in the drawings by the locking portion 220 of the cover bottom 150 inserted into the fastening portion 210 of the guide panel 130. Is prevented.

That is, the guide panel 130 made of a synthetic resin mold material such as polycarbonate is heat generated by driving the liquid crystal panel (110 of FIG. 2) or driving of the backlight unit (120 of FIG. 2) due to material characteristics. Shrinkage and expansion occur as the temperature changes due to the light and the like.

Accordingly, the guide panel 130 flows due to the contraction and expansion of the guide panel 130. The liquid crystal display of the present invention includes a locking portion of the cover bottom 150 in a predetermined space of the fastening portion 210. By inserting the 220, the flow in the X-axis direction and the Z-axis direction defined in the drawings can be prevented.

That is, when the guide panel 130 is to flow in the -X axis direction, the guide as the first vertical portion 131 of the guide panel 130 is in close contact with the engaging portion 220 of the cover bottom 150 When the flow of the panel 130 is blocked and the guide panel 130 tries to generate flow in the + X axis direction, the second vertical portion 211 of the guide panel 130 is caught by the cover bottom 150. As it is in close contact with the 220, the flow of the guide panel 130 is blocked.

In addition, as shown in FIG. 6B, even when the guide panel 130 tries to generate flow in the -Z axis and + Z axis directions, the first and second side surfaces 213a and 213b of the fastening part 210 are formed. It is to block the flow of the guide panel 130.

Therefore, even when shrinkage and expansion occur due to the material characteristics of the guide panel 130, the flow of the guide panel 130 can be prevented, and the flow of the light guide plate 123 due to the flow of the guide panel 130 can also be prevented. Can be.

Here, the fastening portion 210 of the guide panel 130 and the engaging portion 220 of the cover bottom 150 is to be provided with at least one or more along the longitudinal direction of the guide panel 130 and the cover bottom 150. It is preferable.

In addition, the fastening part 210 of the guide panel 130 is inserted into the guide groove 123a formed at the edge of the light guide plate 123, thereby fixing the position of the light guide plate 123 through the fastening part 210.

Therefore, damage to the LED (129a of FIG. 2) of the LED assembly (129 of FIG. 2) is caused by the flow of the light guide plate 123, or the optical characteristics of the liquid crystal display are changed to prevent the problem of deterioration in image quality. can do.

In this case, the fastening part 210 of the guide panel 130 is formed so that the first and second side surfaces 213a and 213b are spaced apart from the first vertical part 131 by a predetermined distance (d in FIG. 3B). Reference numeral 210 has a spring-like elastic restoring force in the X-axis direction defined in the drawing.

Therefore, even when an impact is applied to the modular liquid crystal display from the outside, the fastening portion 210 has fluidity within a certain range, so that vibration and shock are absorbed by the fluidity even if vibration and shock are applied by any pressure. As a result, breakage of the light guide plate 123 may be prevented.

In the liquid crystal display device according to the embodiment of the present invention described above, the cover bottom 150 and the guide panel 130 are assembled and fastened by a hook type fastening method, so that a fixing member such as a screw is not used. As a result, a liquid crystal display having a narrow bezel may be implemented.

Through this, the material cost can be prevented from increasing due to the consumption of the fixing member (not shown) such as a screw, and the liquid crystal panel (110 of FIG. 2) due to the foreign matter generated when fastening the fixing member (not shown) such as a screw. The problem of deterioration of the image quality of the display device can be prevented, and the waste of time, money, and manpower can be minimized in modularizing the LCD.

In particular, the liquid crystal display of the present invention includes a light guide plate 123 by including a fastening part 220 corresponding to the fastening part 220 in the cover panel 150 and a fastening part 220 in the guide panel 130. At the same time, the flow of the guide panel 130 can be prevented even when shrinkage and expansion occur due to the material properties of the guide panel 130.

Through this, it is possible to prevent the flow of the light guide plate 123 due to the flow of the guide panel 130, thereby, the breakage of a plurality of LEDs (129a of FIG. 2) of the LED assembly (129 of FIG. 2). This can be prevented from occurring, or the problem that the optical quality of the liquid crystal display is changed to deteriorate the image quality.

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

123: light guide plate (123a: guide groove)
125: reflector
130: guide panel (131: first vertical portion, 133: horizontal portion, 135: fastening hole)
150: cover bottom (151: horizontal plane, 153: side, 155: fastening protrusion, 155a: stepped surface)
210: fastening portion (211: second vertical portion, 213a, 213b: first and second side surfaces)
220: engaging portion (221: first jaw, 223: second jaw)

Claims (10)

A liquid crystal panel;
A backlight unit positioned on a rear surface of the liquid crystal panel;
A cover bottom on which the backlight unit is seated, a fastening protrusion is provided at an outer side of a side surface, and a locking part is provided at an inner side of the side surface;
A first vertical portion having a fastening hole for inserting the fastening protrusion to be inserted around the edge of the backlight unit, a horizontal portion bent vertically from the first vertical portion to support the liquid crystal panel, and a lower portion of the horizontal portion; Guide panel with fastening part
Including;
The fastening portion is vertically bent from the horizontal portion and includes a second vertical portion facing the first vertical portion and first and second side surfaces parallel to each other at both ends in the longitudinal direction of the second vertical portion,
The first and second side surfaces are formed to be spaced apart from the first vertical portion by a predetermined distance, and the fastening portion has an elastic restoring force in a direction facing the first vertical portion and the second vertical portion.
delete The method of claim 1,
And the second vertical portion becomes thinner toward an end perpendicular to the longitudinal direction.
The method of claim 1,
And the locking portion is inserted into a space defined by the first and second vertical portions and the first and second side surfaces.
The method of claim 4, wherein
The engaging portion is indented inwardly from the side surface, and comprises a first jaw vertically and a second jaw perpendicular to the first jaw and not facing the side surface, wherein an outer side surface of the side surface is in the first vertical portion. A liquid crystal display in close contact with a side surface, and the second jaw in close contact with an inner surface of the second vertical portion.
The method of claim 1,
The backlight unit includes a light guide plate having a guide groove at an edge thereof, and the fastening portion is inserted into the guide groove.
The method of claim 6,
The guide groove is in close contact with the outer surface of the second vertical portion.
The method of claim 1,
The width between the first and second side surfaces corresponds to the width of the locking portion.
The method of claim 5, wherein
The width between the first vertical portion and the second vertical portion corresponds to the width of the first jaw of the locking portion.
The method of claim 6,
The backlight unit includes a LED assembly and an optical sheet.

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