KR101131282B1 - Structure of combinded liquid crystal display device - Google Patents

Abstract

The present invention relates to a fastening structure of a liquid crystal display device. The fastening structure of a liquid crystal display device according to the present invention includes: a liquid crystal panel in which first and second substrates facing each other are bonded to maintain a constant cell gap; A light guide plate for condensing the light of the lamp and irradiating it onto one surface; An optical sheet for condensing and diffusing light supplied from the light guide plate to irradiate the liquid crystal panel; A main support for supporting the light guide plate and the optical sheet at the outside; A lower cover for supporting the lower and side surfaces of the main support; A first groove penetrating the lower cover to a main support; Is inserted into the first groove is configured to include a fastening means for fastening the main support and the lower cover.

Description

STRUCTURE OF COMBINDED LIQUID CRYSTAL DISPLAY DEVICE}

1 is an exploded perspective view of a general liquid crystal display device.

FIG. 2 is a view illustrating an appearance in which a lower cover and a main support are fastened in a liquid crystal display. FIG.

3 is a cross-sectional view showing a side of a liquid crystal display device.

Figure 4 is a view showing a fastening structure of the main support and the lower cover according to the present invention.

Fig. 5A is a sectional view showing the side of a liquid crystal display device with a stopper inserted therein.

Fig. 5B shows another form of the stopper shown in Fig. 5A.

*** Description of the symbols for the main parts of the drawings ***

441: LGP 445: Optical Sheet

450: main support 452: lower cover

470: stopper 471: insertion groove

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fastening structure of a liquid crystal display device. More particularly, the fastening of the main support base and the bottom cover is simple and easy, thereby improving workability. In addition, the present invention relates to a fastening structure of a liquid crystal display device which prevents deterioration of image quality.

In general, a liquid crystal display device includes a thin film transistor array substrate and a color filter substrate facing each other at regular intervals, and are provided in a predetermined space where the thin film transistor array substrate and the color filter substrate are bonded to each other. And a liquid crystal panel including a liquid crystal layer, a driving unit for driving the liquid crystal panel, and a backlight unit for supplying light to the liquid crystal panel.

In the thin film transistor array substrate, a plurality of data lines arranged at regular intervals vertically and a plurality of gate lines arranged at regular intervals laterally intersect with each other, and a pixel is defined in an area that is intersected with each other. Arranged in matrix form.

In addition, a color filter layer of red, green, and blue is formed at a position corresponding to the pixels on the color filter substrate, to prevent light leakage between the color filter layers, and to prevent color interference of light passing through the pixels. A black matrix is formed between the color filter layers.

Common electrodes and pixel electrodes are formed on opposite inner surfaces of the color filter substrate and the thin film transistor array substrate to apply an electric field to the liquid crystal layer. In this case, the pixel electrode is formed for each pixel on the thin film transistor array substrate, while the common electrode is integrally formed on the entire surface of the color filter substrate. Therefore, by controlling the voltage applied to the pixel electrode while applying the voltage to the common electrode, the light transmittance of the pixels can be individually controlled by changing the arrangement state of the liquid crystal molecules of the liquid crystal layer.

The backlight unit supplies light to a liquid crystal display device which does not emit light by itself. When light emitted from the backlight unit passes through the liquid crystal layer, light transmittance is determined by an arrangement state of liquid crystals to display an image.

The liquid crystal display as described above will be described in detail with reference to the accompanying drawings.

1 is an exploded perspective view of a general liquid crystal display device.

Referring to FIG. 1, a liquid crystal display device includes a liquid crystal panel 10 in which pixels are arranged in a matrix form; A gate driver 20 and a data driver 30 connected to side surfaces of the liquid crystal panel 10, respectively; The backlight unit 40 is disposed on the rear surface of the liquid crystal panel 10.

The liquid crystal panel 10 includes a thin film transistor array substrate and a color filter substrate which are bonded to face each other to maintain a uniform cell-gap, and a liquid crystal layer formed at a spaced interval between the color filter substrate and the thin film transistor array substrate.

A common electrode and a pixel electrode are formed in the liquid crystal liquid crystal panel where the thin film transistor array substrate and the color filter substrate are bonded 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 while the voltage is applied to the common electrode, the liquid crystal of the liquid crystal layer is rotated by dielectric anisotropy according to the electric field between the common electrode and the pixel electrode. For example, characters or images are displayed by transmitting or blocking light for each pixel.

In addition, switching elements such as thin film transistors are individually provided in the pixels in order to control the voltage of the data signal applied to the pixel electrode for each pixel.

The gate driver 20 and the data driver 30 are combined with the liquid crystal panel 10 in various forms to supply scan signals and image information to gate lines and data lines formed in the liquid crystal panel 10, thereby providing liquid crystals. The pixels of the panel 10 are driven.

The backlight unit 40 may include a light guide plate 41 disposed on a rear surface of the liquid crystal panel 10; A lamp 42 and a lamp housing 43 disposed on both side surfaces of the light guide plate 41; The light guide plate 41 includes a reflective plate 44 disposed on a rear surface of the light guide plate 41, and an optical sheet 45 is disposed between the liquid crystal panel 10 and the light guide plate 41.

The light generated by the lamp 42 is incident on the side surface of the light guide plate 41 formed of a transparent material.

The reflective plate 44 disposed on the rear surface of the light guide plate 41 reflects the light transmitted through the rear surface of the light guide plate 41 to the top surface of the light guide plate 41 to reduce the loss of light and is transmitted to the top surface of the light guide plate 41. Improves light uniformity

Therefore, the light guide plate 41 transmits the light generated by the lamp 42 together with the reflecting plate 44 to the upper surface.

In the optical sheet 45 disposed between the liquid crystal panel 10 and the light guide plate 41, a diffusion sheet and a prism sheet may be applied, and a protective sheet may be added.                         

The diffusion sheet disperses the light incident from the light guide plate 41 to prevent the light from being partially concentrated, thereby preventing stains from occurring in the image displayed on the liquid crystal panel 10, and the angle of the light incident from the light guide plate 41. Refract vertically.

The prism sheet collects light incident from the diffusion sheet to be uniformly distributed on the entire surface of the liquid crystal panel 10.

The protective sheet protects the optical sheet 45 which is sensitive to dust and scratches, prevents the flow of the optical sheet 45 when the backlight unit 40 is transported, and diffuses light incident from the prism sheet. It can have a function to make the light more uniformly distributed.

On the other hand, the backlight unit 40 has an edge method provided with two lamps 42 on both sides of the light guide plate 41, but an edge method provided with a lamp may be applied to only one side of the light guide plate 41. Alternatively, the direct method in which the lamp 42 is disposed to correspond to the entire rear surface of the liquid crystal panel 10 may be applied.

The driver 30 includes a printed circuit board 31. The printed circuit board 31 includes integrated circuit chips for generating various electrical signals for driving the pixels of the liquid crystal panel 10, and the electrical signals. Since wires for transmission are mounted, a constant area is required.

Therefore, the printed circuit board 31 disposed on the bottom surface of the lower cover 52 is protected by the cover shield 53 coupled with the lower cover 52 by screws.

Meanwhile, the liquid crystal panel 10 and the backlight unit 40 are stacked on a main support 50, and the side surfaces of the stacked liquid crystal panel 10 and the backlight unit 40 are attached to the main support 50. Is supported by.

The upper edge of the liquid crystal panel 10 is compressed by the upper case 51, and the upper case 51 is coupled to the main support 50 by a screw.

The liquid crystal panel 10 and the backlight unit 40 are supported by a lower cover 52 disposed on the rear surface of the backlight unit 40, and the lower cover 52 is supported by the upper case 51 and a screw. Combined. In addition, the lower cover 52 is coupled by a main support 50 and a screw. The fastening structure of the liquid crystal display device as described above will be described in detail with reference to the accompanying drawings.

FIG. 2 is a view illustrating an appearance in which a lower cover and a main support are fastened in a liquid crystal display.

Referring to FIG. 2, a rear surface of the liquid crystal display device is shown. The liquid crystal display device includes an upper case 151 for wrapping and supporting a main support (not shown), and a side surface of the upper case 151 for pressing. A lower cover 152 for supporting and protecting the lower surface of the lower cover 152, and comprises a scrub 160 for coupling through the lower cover 152 and the main support.

Although not shown in the drawings, the main support is fixed to the light guide plate and the optical sheet inserted into the inner space to prevent the flow, the outer side and the bottom of the main support is provided in the form to surround the main support. In addition, the upper case 151 is finally covered with the side of the lower cover 152 and the upper portion of the main support.                         

The lower cover 152 is usually coupled to the main support by a screw 160, the coupling form is as follows.

3 is a cross-sectional view showing a side of a liquid crystal display.

Referring to FIG. 3, a light guide plate 241 for dissipating light emitted from a lamp (not shown) to the entire liquid crystal panel, an optical sheet 245 for dispersing and condensing light emitted from the light guide plate 241, and The main support 250 which is stacked on the optical sheet 245 and supports and protects the lamp, the light guide plate 241 and the optical sheet 245, and a lower part of the light guide plate 241 and the main support 250. It is configured to include a lower cover 252 for protecting and supporting.

In the liquid crystal display device, a lamp is provided on the rear surface of the liquid crystal panel 210 to directly irradiate light to the front surface of the liquid crystal panel 210. The direct type method is used. The light guide plate is provided on the side of the liquid crystal panel 210. The method of indirectly irradiating the entire surface of the liquid crystal panel 210 by 241 is called an edge type method. In FIG. 3, an edge-type method is illustrated. Although not shown in the drawing, a lamp is provided on the other side of the light guide plate 241 to irradiate light to the light guide plate 241.

Figure 3 is a view showing the coupling form of the main support 250 and the lower cover 252, unnecessary parts are omitted. Although not shown in the drawings, the liquid crystal display device includes a liquid crystal panel 210 stacked on an upper portion of the main support 250 to adjust the transmittance of light emitted from the lamp to display an image, and an upper surface of the liquid crystal panel 210. Compresses the edge of the upper cover (not shown) is coupled to the side of the lower cover 252 is included.

In general, the lower cover 252 is made of a metal material, the main support 250 is made of a synthetic resin such as polycarbonate (PC). As described above, in order for the liquid crystal display to be strongly coupled to support the internal components, the main support 250 and the lower cover 252 must be correctly coupled.

The main support 250 and the lower cover 252 are usually fastened by a screw 260 or the like. As shown, the screw 260 penetrates through the lower cover 252 and the main support 250. Through) The screw 260 is penetrated while forming a threaded groove in the lower cover 252 and the main support 250 by the rotational force.

By the way, since the main support 250 is made of synthetic resin, when the screw 260, which is usually made of metal, is forced to come in while making a screw-shaped groove, the main support 250 is caused by friction with the screw 260. Is worn and foreign substances are generated. These foreign matters may be scattered inside the liquid crystal display, causing poor image quality or poor driving.

When the screw 260 is fastened, the lower cover 252 and the main support 250 may be penetrated exactly vertically, but the main support 250 may be fastened in an oblique state due to an error in operation. If so, one side of the corner of the main support 250 may be forcibly compressed to the optical sheet 245. In this case, when the area of the light guide plate 241 is increased by the heat generated inside the liquid crystal display, the optical sheet 245 is fixed by the crimping of the main support 250, and thus, the optical sheet 245. Wrinkles occur in the central area of the. That is, since the optical sheet 245 cannot perform the function of accurately concentrating and dispersing the light supplied from the lamp, the optical sheet 245 cannot display an accurate image on the liquid crystal panel.

In general, when the main support 250, the light guide plate 241, and the optical sheet 245 are fastened, the main support 250, the light guide plate 241, and the optical sheet 245 have a small space therebetween. This is to secure the space to some extent because the area of the light guide plate 241 and the optical sheet 245 can be enlarged by heat generated by a lamp, a driving circuit, or the like in the liquid crystal display device.

Meanwhile, four or more screws 260 are used for the lower cover 252 to be fastened with the main support 250. The screw 260 has to be fastened by the operator to apply the rotational force, respectively, it takes a considerable time. Therefore, in the production of a large number of liquid crystal display devices, it becomes a factor of lowering the overall productivity.

The present invention was devised to solve the conventional problems as described above, and an object of the present invention is a fastening structure of a liquid crystal display device that can prevent the deterioration of image quality caused by foreign matter or wrong fastening caused by the fastening by a screw To provide.

In order to achieve the above object of the present invention, a fastening structure of a liquid crystal display device includes: a bonded liquid crystal panel in which a thin film transistor array substrate and a color filter substrate facing each other are bonded to have a predetermined cell gap; A light guide plate for condensing the light of the lamp and irradiating it onto one surface; An optical sheet for condensing and diffusing light supplied from the light guide plate to irradiate the liquid crystal panel; A main support for supporting the light guide plate and the optical sheet at the outside; A lower cover for supporting the lower and side surfaces of the main support; A first groove penetrating the lower cover to a main support; Is inserted into the first groove is configured to include a fastening means for fastening the main support and the lower cover.

As the grooves in the form of a screw thread are forcibly formed by the rotational force of the screw as in the related art, foreign matters are generated by friction in the main support, and each screw to be fastened must be applied to the lower cover and the main support by applying rotational force individually. Inferior in performance, but in the present invention, by applying the fastening means that can be fitted at a time, the fastening is easy, and the production time can be shortened to increase productivity. In addition, since foreign matter does not occur during fastening, it is possible to prevent poor image quality or poor driving due to foreign matter.

Referring to the fastening structure of the liquid crystal display of the present invention as described above in detail with reference to the accompanying drawings as follows.

4 is a view showing a fastening structure of the main support and the lower cover according to the present invention.

Referring to FIG. 4, the fastening structure of the liquid crystal display device includes a main support 351 supporting and supporting an optical member such as an optical sheet and a light guide plate therein, and supporting the lower and side surfaces of the main support 351. And a lower cover 352 for protecting and penetrating a side surface of the lower cover 352 and an insertion groove formed to a predetermined depth of the main support 351, and inserted into the insertion groove so as to be inserted by the elastic force. It is configured to include a stopper (370) for fastening the lower cover 352 and the main support (350).

Since the stopper 370 can be pushed by a simple hand without applying artificial rotational force, the stopper 370 brings a reduction in working time. At least one stopper 370 and an insertion groove are inserted into the liquid crystal display. A liquid crystal display device in which the stopper 370 is inserted will now be described in detail.

FIG. 5A is a cross-sectional view illustrating a side of a liquid crystal display device having a stopper inserted therein, and FIG. 5B is a view illustrating another form of the stopper shown in FIG. 5A.

Referring to the drawings, a light guide plate 441 for emitting light emitted from a lamp (not shown) to the front of the liquid crystal panel and the light guide plate 441 is stacked on the light guide plate 441 to disperse and collect light supplied from the light guide plate 441. An optical sheet 445, a main support 450 stacked on the optical sheet 445, and supporting and protecting the lamp, the light guide plate 441, and the optical sheet 445, and the light guide plate 441. And a lower cover 452 for protecting and supporting a lower portion of the main support 450, and formed on a side surface of the lower cover 452, penetrating the lower cover 452, and of the main support 450. The insertion groove 471 is formed to a part, and is inserted into the insertion groove 471 is configured to include a stopper 470 for fastening the main support 450 and the lower cover 452.

In Figure 5a to show the fastening structure of the main support 450 and the lower cover 452, which is a feature of the present invention, the unnecessary parts such as the upper case, the liquid crystal panel is omitted.

FIG. 5A illustrates an edge-type system in which a lamp is provided on the side of the liquid crystal panel 410 so that light emitted from the lamp is indirectly irradiated onto the entire liquid crystal panel 410 by the light guide plate 441. Since it relates to a structure for fastening the main support 450 and the lower cover 452, it may be applied regardless of the edge type or direct type of the arrangement of the lamp.

Although not shown in the drawings, the liquid crystal display device includes a liquid crystal panel 410 stacked on an upper portion of the main supporter 450 to control the transmittance of light emitted from the lamp to display an image, and an upper surface of the liquid crystal panel 410. Compresses the edge of the upper cover (not shown) is coupled to the side of the lower cover 452 is included.

Conventionally, the lower cover 452 and the main support 450 are fastened by penetrating the lower surface of the lower cover 452 with a screw or the like to form a screw-shaped groove to the main support 450 by the rotational force. In the present invention, as shown, the insertion groove 471 is formed on the side of the lower cover 452, the fastening means is inserted into the insertion groove 471 to the lower cover 452 and the main support 450 Tighten.

The insertion groove 471 penetrates the lower cover 452 and is formed to a part of the main support 450, and the stopper 470 that is a fastening means is formed larger than the width of the insertion groove 471. It is fastened to the inside of the insertion groove 471 by elasticity. That is, when the stopper 470 larger than the width of the insertion groove 471 is inserted into the insertion groove 471, the stopper 470 is returned to its original shape by elasticity. ) It is compressed by pushing both sides of the inside strongly.

The insertion groove 471 may be formed on the side of the lower cover 452, but may be formed on the bottom surface.

As described above, the main supporter 450 and the lower cover 452 may be coupled by simply pushing the stopper 470 into the insertion groove 471. Therefore, even if the stopper 470 is fastened to the same number as the conventional screw, it is possible to relatively shorten the working time.

In addition, by forming the insertion groove 471 in the main support 450 and the lower cover 452 in advance, and inserting the stopper 470 into the insertion groove 471, the fastening is completed, so the groove of the conventional threaded form The foreign substance generated while forming the was removed. The stopper 470 is made of the same polycarbonate as the material of the main support 450.

In addition, since the stopper 470 is fastened through the preformed insertion groove 471 and the main support 450 and the lower cover 452 are coupled to each other, the optical sheet 445 of the main support 450 is squeezed by an incorrect fastening. By preventing the back, it is possible to ensure a predetermined space between the main support 450, the optical sheet 445, the light guide plate 441. Therefore, even when the area of the optical sheet 445 is expanded by heat inside or outside the liquid crystal display, wrinkles may be prevented.

On the other hand, in the fastening structure of the main support 450 and the lower cover 452 according to the present invention, since the elastic force of the stopper 470 may be weakened to reduce the fastening force, as shown in FIG. 5B to compensate for the weakening of the fastening force. A stopper 470 having a shape has been proposed.

The stopper 470 having a different shape from that of FIG. 5A additionally forms a protrusion 475 in the portion inserted into the insertion groove 471, thereby obtaining an additional fastening force by the protrusion 475.

At this time, an insertion groove 471 is formed in the groove to be inserted into the protrusion 475 of the stopper 470. Therefore, when the stopper 470 is inserted into the insertion groove 471, the protrusion 475 is coupled to the groove inside the insertion groove 471 in addition to the elastic force of the stopper 470, thereby obtaining additional coupling force. At least one protrusion 475 may be formed in the stopper 470.

In addition, when the insertion groove 471 is formed through the entirety of the main support 450 instead of a part of the main support 450, the stopper 470 may be tightened more strongly, and thus, the main support 450 and the lower cover 452. ) May be more strongly combined.

As described above, the fastening structure of the liquid crystal display device according to the present invention can easily and easily fasten the main support and the lower cover by the stopper having an elastic force, so that the foreign matter or the optical sheet generated by the wrong fastening It is possible to prevent a poor driving of the liquid crystal display and deterioration of image quality due to wrinkles.

Claims (9)

A liquid crystal panel in which two substrates facing each other are bonded to each other such that a constant cell-gap is maintained; An optical member for condensing and diffusing light of a lamp to irradiate the liquid crystal panel; A main support for supporting the light guide plate and the optical sheet at the outside; A lower cover which supports the bottom and side surfaces of the main support; A first groove penetrating from the side of the lower cover to the side of the main support; Two bars parallel to each other formed wider than the width of the first groove is inserted into the first groove through the side of the lower cover and the two bars are pressed against the main support wall of the first groove by the elasticity of the two bars Fastening means for fastening the main support and the lower cover by the pressing force of the bar against the wall by applying a; At least one hemispherical protrusion formed on the fastening means; And A fastening structure of an image display apparatus including a second groove formed in the first groove and into which the protrusion is inserted. The fastening structure of an image display apparatus according to claim 1, wherein the first groove is formed only in a part of the main support. delete delete delete The fastening structure of an image display apparatus according to claim 1, wherein the fastening means is made of polycarbonate (PC). delete delete delete

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