KR101513159B1 - Structure for jointing liquid crystal display device - Google Patents

Abstract

The present invention relates to a fastening structure for a liquid crystal display, and more particularly, to a fastening structure for a liquid crystal display, which comprises an LED array composed of a plurality of light emitting elements for emitting light; A light guide plate disposed adjacent to the LED array to supply light incident from the LED array in one direction; A liquid crystal panel disposed above the light guide plate and displaying an image by light incident through the light guide plate; An LED housing in which the LED array is mounted on an inner side, a fastening protrusion and a protrusion are formed on a lower surface and a side surface, respectively; A lower cover coupled to the fastening protrusions and protrusions of the LED housing, respectively, to support and protect the LED housing; And an upper case for protecting the lower cover and the LED housing.

LED array, fastening protrusion, projection, LED housing, light guide plate, fastening hole, guide portion

Description

[0001] The present invention relates to a liquid crystal display device,

The present invention relates to a fastening structure of a liquid crystal display device, and more particularly, to a fastening structure of a liquid crystal display device, in which a main support is omitted and a LED housing is directly fastened to a structure, Thereby shortening the time and reducing the volume of the product.

Due to the rapid development of the semiconductor industry in recent years, liquid crystal display devices have become smaller, lighter, and more powerful in performance. A CRT (cathode ray tube) widely used in information display devices has many advantages in terms of performance and cost, but has many disadvantages in terms of miniaturization and portability.

On the other hand, the liquid crystal display device has advantages such as miniaturization, light weight, low power consumption, and has been attracting attention as an alternative means to overcome the shortcomings of the CRT. Currently, almost all the information processing devices As shown in Fig.

Such a liquid crystal display generally changes the optical properties such as birefringence, optical rotation, dichroism and light scattering characteristics of a liquid crystal cell that emits light by changing the molecular arrangement by applying a voltage to a specific molecular arrangement of the liquid crystal Is a display device that uses modulation of light by a liquid crystal cell.

Recently, various structures have been developed for slimmer and lighter weight in order to secure competitiveness of products. One of them is a liquid crystal panel in which an array substrate and a color filter substrate are laminated, a backlight unit as an optical unit is laminated, inserted into a main support for protection thereof, and then combined with an upper case and a lower cover, Thereby constituting a mold frame structure.

A conventional liquid crystal display having such a structure will be described with reference to FIG.

1 is a schematic partially exploded perspective view showing parts assembled to a main support of a liquid crystal display according to a related art.

1, a conventional liquid crystal display (LCD) device includes an LED array 13 including a plurality of light emitting devices 13a for emitting light, a light source 13 for emitting light emitted from the LED array 13 to the front of the liquid crystal panel An optical sheet 11 for dispersing and condensing the light emitted from the light guide plate 15 and an optical sheet 11 which is stacked on the optical sheet 11 and which is irradiated from the LED array 13 A main support base 21 for supporting and protecting the light guide plate 15 and the optical sheet 11 and a main support frame 21 for supporting the light guide plate 15 and the optical sheet 11, A lower cover 23 which is disposed on the inside of the main support base 21 and is secured to the main support base 21 by a screw 25a to protect and support a lower portion of the main support base 21; And an upper case (1) coupled to a side surface of the lower cover (23) The.

Here, the light generated in the LED array 13 is incident through the side surface of the light guide plate 15. [

Although not shown in the drawing, a reflection plate (not shown) is disposed on the back surface of the light guide plate 15 to reflect light transmitted through the back surface of the light guide plate 15 to the upper surface of the light guide plate to reduce light loss, Thereby improving the uniformity of light transmitted through the light guide plate.

The optical sheet 11 disposed between the liquid crystal panel 5 and the light guide plate 15 is composed of a diffusion sheet 11a and prism sheets 11b and 11c and a protective sheet have.

The lower cover 23 is bent at its center and an LED array 13 composed of a plurality of light emitting elements 13a is disposed inside the bent portion. A screw fastening hole 23a is formed so as to be fastened.

A screw coupling groove 25a is formed in a side surface of the main support 21 corresponding to the screw fastening hole 23a of the lower cover 23 so that the lower cover 23 is coupled to the main support 21 , The screw 25 is fastened to the screw fastening groove 25a through the fastening hole 23a and fastened, thereby completing the assembly of the product.

However, the liquid crystal display according to the related art has the following problems.

The liquid crystal display device according to the related art applies a part lower cover which protects the light emitting element from an external impact and reflects light from the light emitting element to the opposite side of the light guide plate to collect light back toward the light guide plate, The lower cover and the main support are fastened by screws in order to make it difficult to fasten or to strengthen the bonding force of the structure.

However, when the lower cover and the main support are fastened, the fastening time using the screw may be somewhat delayed, and the press bending that occurs when the screw is fastened or the torque value at the time of fastening the screw increases, There is a possibility that a problem such as a foreign object in the mold structure such as the main support is generated.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a LED lighting device capable of eliminating a main support from a method of screwing and fastening an LED housing directly to a structure And it is an object of the present invention to provide a fastening structure for a liquid crystal display device which can shorten the assembling time of the backlight assembly and reduce the volume of the product.

According to an aspect of the present invention, there is provided a liquid crystal display device comprising: an LED array including a plurality of light emitting devices for emitting light; and a light emitting device disposed adjacent to the LED array, A liquid crystal panel disposed above the light guide plate and displaying an image by light incident through the light guide plate; an LED housing having the LED array mounted on the inner side and having fastening protrusions and protrusions formed on the lower surface and the side surface, respectively; A lower cover coupled to each of the fastening protrusions and the protrusions of the LED housing to support and protect the LED housing, a guide part for guiding and fixing the liquid crystal panel to the edge of the lower cover, And an upper case for protecting the housing, wherein a portion of the guide portion corresponding to the protrusion of the LED housing And a locking step formed on the guide portion provided inside thereof, in combination with the projections on the locking step is characterized in that the LED housing is supported and fixed.

The fastening structure of the liquid crystal display device according to the present invention has the following effects.

The fastening structure of the liquid crystal display according to the present invention can securely fix the backlight unit and the liquid crystal panel by fixing the lower cover directly to the LED housing without the conventional main support, Has the advantage of not flowing.

Further, in the fastening structure of the liquid crystal display of the present invention, the engagement protrusions formed on the guide portion of the lower cover and the protruding portions of the LED housing are coupled to each other to prevent vertical and horizontal movement.

Further, the present invention can shorten the assembling time using the conventional screw, and shorten the whole backlight assembling process time.

In addition, although the torque is increased when the screw is tightened, the screw can not be used due to the idle screw. However, in the present invention, the fastening protrusion of the LED housing is fastened to the fastening hole of the lower cover without using the screw Since assembly is possible, the quality problem of the product can be improved. Particularly, in the thin model, the risk of the bending stress occurring in screw tightening can be minimized.

The present invention can fundamentally prevent the problem of foreign matter generation in the mold that occurs during the conventional screw fastening.

Further, since the liquid crystal panel can be guided and fixedly supported by the guide part of the lower cover without using the conventional main support, the thickness of the product can be reduced and the product cost can be reduced.

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

2 is a schematic exploded perspective view showing components of a liquid crystal display device according to the present invention.

Referring to FIG. 2, a liquid crystal display device according to the present invention includes a liquid crystal panel 105 in which pixels are arranged in a matrix form; A gate driver (not shown) and a data driver (not shown) connected to the sides of the liquid crystal panel 105; And a backlight unit (not shown) disposed on the back surface of the liquid crystal panel 105.

The liquid crystal panel 105 includes a thin film transistor array substrate, a color filter substrate, and a liquid crystal layer formed between the color filter substrate and the thin film transistor array substrate so as to maintain a uniform cell gap.

A common electrode and a pixel electrode are formed on the liquid crystal panel in which the thin film transistor array substrate and the color filter substrate are bonded together to apply an electric field to the liquid crystal layer.

Therefore, when the voltage of the data signal applied to the pixel electrode is controlled in the state where the voltage is applied to the common electrode, the liquid crystal of the liquid crystal layer rotates by the dielectric anisotropy according to the electric field between the common electrode and the pixel electrode , The light is transmitted or blocked for each pixel to display a character or an image.

In order to control the voltage of the data signal applied to the pixel electrode on a pixel-by-pixel basis, a switching element such as a thin film transistor is separately provided in the pixels.

The gate driver (not shown) and the data driver (not shown) are coupled with the liquid crystal panel 105 in various forms to supply scan signals and image information to the gate lines and data lines formed on the liquid crystal panel 105 Thereby driving the pixels of the liquid crystal panel 105.

The backlight unit (not shown) includes a light guide plate 115 disposed on a rear surface of the liquid crystal panel 105; An LED array 113 and an LED housing 121 disposed on one side or both sides of the light guide plate 115; And a reflection plate 117 disposed on the back surface of the light guide plate 115. An optical sheet 111 is disposed between the liquid crystal panel 105 and the light guide plate 115. [

Light generated from the plurality of light emitting devices 113a included in the LED array 113 is incident into the light guide plate through the side surface of the light guide plate 115 formed of a transparent material.

The reflection plate 117 disposed on the back surface of the light guide plate 115 reflects the light transmitted through the back surface of the light guide plate 115 to the upper surface of the light guide plate 115 to reduce the loss of light and transmits the light to the upper surface of the light guide plate 115 Thereby improving the uniformity of light.

Accordingly, the light guide plate 115 transmits the light generated from the LED array 113 together with the reflection plate 117 to the upper surface.

The diffusion sheet 111a and the prism sheets 111b and 111c may be applied to the optical sheet 111 disposed between the liquid crystal panel 105 and the light guide plate 115. A protective sheet .

The diffusion sheet 111a disperses the light incident from the light guide plate 115 to prevent the light from being partially densely packed and causing unevenness in the image displayed on the liquid crystal panel 105. The light guide plate 115, Thereby vertically refracting the angle of the light.

The prism sheets 111b and 111c collect light incident from the diffusion sheet 111a and uniformly distribute the light on the entire surface of the liquid crystal panel 105. [

Further, the protective sheet (not shown) protects the optical sheet 111 sensitive to dust or scratches and prevents the flow of the optical sheet 111 when the backlight unit (not shown) is conveyed, and the prism sheet 111b And 111c, so that the light can be more uniformly distributed.

In the backlight unit (not shown), an edge method including one LED array 113 including a plurality of light emitting devices 113a is applied to one side of the light guide plate 115, An edge method in which two LED arrays are provided on both sides of the LED array 115 can be applied.

The liquid crystal panel 105 and the backlight unit (not shown) are stacked on the lower cover 123. The stacked liquid crystal panel 105 and the backlight unit (not shown) And is supported by a fastening hole 123a formed and a guide portion 123b protruding from the side surface. At this time, a fastening protrusion 121a formed on a lower surface of the LED housing 121 is fitted and fastened to a fastening hole 123a formed in the lower surface of the lower cover 123, A protruding portion 121b extending from the side surface of the LED housing 121 is fixed to the engaging protrusion 124 formed inside the LED portion 121b.

The upper edge of the liquid crystal panel 105 is pressed by the upper case 101 and the upper case 101 is coupled to the lower cover 123 by screws or other fastening means.

A gate PCB (not shown) and a data PCB (not shown) are provided on the gate driver and the data driver, respectively, and various signals (not shown) for driving the pixels of the liquid crystal panel 105 And wirings for transmitting the electric signals are mounted.

A coupling structure of the liquid crystal display device having the above-described structure will be described with reference to FIG.

3 is a schematic cross-sectional view showing parts of a liquid crystal display device according to the present invention.

FIG. 4 is a perspective view illustrating a coupling structure of a bottom surface of the LED housing and a bottom cover in a fastening structure of a liquid crystal display device according to the present invention. FIG.

5 is an assembled perspective view illustrating a coupling structure between a side surface portion of the LED housing and a side surface portion of the lower cover in the fastening structure of the liquid crystal display device according to the present invention.

Referring to FIG. 3, the liquid crystal display according to the present invention includes a liquid crystal panel 105, a backlight unit (not shown), a lower cover 123, and an upper case 101.

An LED housing 121 having a reflective plate 117, a light guide plate 115 and an optical sheet 111 and an LED array 113 composed of a plurality of light emitting elements 113a is disposed on the lower cover 123, A backlight unit (not shown) is mounted.

A light shielding tape 114 is attached on the LED housing 121 and the liquid crystal panel 105 is adhered to the LED housing 121 by the shielding tape 114.

The fastening protrusion 121a formed on the lower surface of the LED housing 121 is inserted into the fastening hole 123a formed in the lower cover 123 and the LED housing 121 is fixed on the lower cover 123 , It does not flow to the left or right due to external impact or vibration.

The projecting portion 121b formed on the side surface of the LED housing 121 is fixed to the guide portion 123b formed on the side surface of the lower cover 123 so as to be hooked on the engaging protrusion 124, It does not flow upward and downward.

The lower cover 123 coupled with the LED housing 121 is assembled with the upper case 101 to protect the backlight unit (not shown) together with the liquid crystal panel 105.

As described above, a structure in which the LED housing is coupled to the lower cover will be described in detail with reference to FIGS. 4 and 5. FIG.

4 shows a state where the lower surface of the LED housing 121 is coupled to the lower cover 121. The lower cover 121 corresponds to the fastening protrusion 121a of the LED housing 121, 123 are formed with fixing holes 123a at regular intervals.

The fastening holes 123a formed on the lower cover 123 are formed at regular intervals along one side edge portion corresponding to an area where the LED housing 121 is installed, The reflector 117 extends to the line where the fastening hole 123a is formed when the light guide plate 115 and the reflection plate 117 are disposed.

5, a side surface portion of the LED housing 121 is coupled to a side surface portion of the lower cover 123. The protruding portion 121b formed on the side surface of the LED housing 121 Is partially engaged with and fixed to the inner wall of the guide portion 121b formed on the side surface of the lower cover 121, there is no upward / downward flow. Since the lower portion of the guide portion 123b is thinner than the upper portion of the guide portion 123b formed in the guide portion 123b of the lower cover 123, 121 are fitted into the inside of the guide portion 123b and fixed by the engaging jaws 124 so that there is no upward and downward flow.

As described above, according to the present invention, since the lower cover 123 is directly coupled to the LED housing 121 without fixing the conventional main support, the backlight unit and the liquid crystal panel can be fixed more securely, There is an advantage that the unit does not flow.

The engagement protrusions 124 formed on the guide portions of the lower cover 123 and the projections 121b of the LED housing 121 are coupled to each other to prevent vertical and horizontal movement.

Therefore, the present invention can shorten the assembling time using the conventional screw, and shorten the whole backlight assembling process time.

Further, in the conventional art, when the screw torque is too high, the screw is idle so that the screw can not be used. However, in the present invention, the fastening protrusion of the LED housing is fastened to the fastening hole of the lower cover without using the screw Since assembly is possible, the quality problem of the product can be improved. Particularly, in the thin model, the risk of the bending stress occurring in screw tightening can be minimized.

In addition, it is possible to prevent the problem of mold foreign matter generation occurring during the conventional screw tightening.

In addition, since the present invention can guide and support the liquid crystal panel by the guide part of the lower cover without using the conventional main support, the thickness of the product can be reduced and the product cost can be reduced.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments.

1 is a schematic partially exploded perspective view showing parts assembled to a main support of a liquid crystal display according to a related art.

2 is a schematic exploded perspective view showing parts of a liquid crystal display device according to the present invention.

3 is a schematic cross-sectional view showing parts of a liquid crystal display device according to the present invention.

FIG. 4 is a perspective view illustrating a coupling structure of a bottom surface of the LED housing and a bottom cover in a fastening structure of a liquid crystal display device according to the present invention. FIG.

5 is an assembled perspective view illustrating a coupling structure between a side surface portion of the LED housing and a side surface portion of the lower cover in the fastening structure of the liquid crystal display device according to the present invention.

*** Description of the main parts of drawings ***

101: upper case 105: liquid crystal panel

111: optical sheet 111a: diffusion sheet

111b, 111c: prism sheet 113: LED array

113a: Light emitting element 114: Shading tape

115: light guide plate 117: reflector 121: LED housing 121a: fastening projection

121b: protrusion 123: bottom cover

123a: fastening hole 123b: guide portion

Claims (5)

An LED array comprising a plurality of light emitting elements emitting light; A light guide plate disposed adjacent to the LED array to supply light incident from the LED array in one direction; A liquid crystal panel disposed above the light guide plate and displaying an image by light incident through the light guide plate; An LED housing in which the LED array is mounted on an inner side, a fastening protrusion and a protrusion are formed on a lower surface and a side surface, respectively; A lower cover coupled to each of the fastening protrusions and protrusions of the LED housing to support and protect the LED housing; A guide portion for guiding and fixing the liquid crystal panel to an edge portion of the lower cover; And And an upper case for protecting the lower cover and the LED housing, Wherein a locking protrusion is formed inside a guide portion provided at a position corresponding to a protrusion of the LED housing, and the LED housing is fixedly coupled to the protrusion at the locking protrusion. The fastening structure of a liquid crystal display device according to claim 1, wherein a fastening hole is formed in a lower surface of the lower cover corresponding to a fastening protrusion formed on a lower surface of the LED housing. delete delete The liquid crystal display device according to claim 1, wherein an optical sheet is provided between the light guide plate and the liquid crystal panel, and a reflection plate is provided under the light guide plate.

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