KR20050034454A - Structure combinding light guide plate with mold frame of liquid crystal display - Google Patents

Abstract

The present invention relates to a fastening structure of a mold frame and a light guide plate of a liquid crystal display device. The fastening structure of the light guide plate and a mold frame of a liquid crystal display device fixes a liquid crystal panel and a lamp, and a predetermined angle is set at at least one corner thereof. And a light guide plate to guide the light emitted from the lamp to the liquid crystal panel, and an inclined surface having a predetermined angle in contact with the protrusion of the mold frame. The protrusion of the mold frame and the inclined surface of the light guide plate are coupled to each other to prevent vibration, to prevent physical damage caused by external impact, to prevent damage to the light guide plate, and to extend the effective display area of the liquid crystal display device, thereby improving brightness. Let's do it.

Description

STRUCTURE COMBINDING LIGHT GUIDE PLATE WITH MOLD FRAME OF LIQUID CRYSTAL DISPLAY}

The present invention relates to a fastening structure of a mold frame and a light guide plate of a liquid crystal display device, and more particularly, to a fastening structure of a mold frame and a light guide plate of a liquid crystal display device having a wider effective area to improve light efficiency.

Recently, liquid crystal displays have been widely used in small portable devices, computer monitors, home TVs, etc. due to the advantages of being able to realize light and small size and low power consumption compared to conventional cathode ray tubes (CRTs). have.

In general, a liquid crystal display device includes a liquid crystal display panel (LCD) for displaying image information, a driving unit for driving the liquid crystal display panel, and a backlight unit attached to a rear surface of the liquid crystal display panel to supply light to the liquid crystal display panel ( Back Light Unit).

The liquid crystal display panel includes a thin film transistor array substrate, a color filter substrate, and a liquid crystal filled in a predetermined space between the two substrates.

Since the liquid crystal display device is a passive element that does not emit light by itself, a separate light source must be attached to the rear surface of the liquid crystal display panel, which is a backlight.

The backlight unit generates a lamp, a light guide plate for guiding the light from the lamp toward the liquid crystal display panel, and reflects the light lost through the light guide plate back to the light guide plate to the liquid crystal display. Reflector for improving the light efficiency of the panel, diffuser for diffusing light from the light guide plate and preventing the spots from being partially concentrated on the screen, and adjusting the angle of the light diffused by the diffuser To protect the first and second prism sheets and the lower sheets, that is, the light guide plate, the reflecting plate, the diffuser plate, the first and second prism sheets from scratches and dust, and to distribute the light on the screen. It is configured to include a protective sheet to assist the function of the diffusion plate by diffusing light to be more uniform.

Hereinafter, a liquid crystal display including a backlight unit and a liquid crystal display panel will be described in detail with reference to the accompanying drawings.

FIG. 1 is a plan view showing the appearance of a liquid crystal display generally used, and FIG. 2 is a cross-sectional view of I-I of FIG.

Referring to the drawings, the liquid crystal display panel 1 is formed with an active display area A in which an image is actually displayed, and a part of the entire area of the liquid crystal display panel 1 except the effective display area A is shown. The area is supported and fixed by the upper case 2.

The inside of the mold frame 4 is provided with a lamp (not shown), the light guide plate 3 for uniformly transmitting the light from the lamp to the entire liquid crystal display panel 1, and the light guide plate 3 below Diffuses and condenses the light emitted from the light guide plate 3 and the reflector 10 and the light guide plate 3 to increase the efficiency of light by reflecting the light traveling in the opposite direction of the liquid crystal display panel 1 toward the liquid crystal display panel 1 And an inner sheet 5 formed of a diffusion sheet and a prism sheet, and a protective sheet 6 disposed on the inner sheet 5 to prevent the inner sheets 5 from being damaged by dust or scratches. do.

Since the protective sheet 6 is provided to protect the inner sheet 5, it is preferable that the protective sheet 6 be designed slightly wider than the inner sheet 5. A cushion tape 7 is provided in the edge area on the protective sheet 6, and the liquid crystal display panel 1 is mounted by the cushion tape 7. In this way, a cushion tape 7 is provided between the protective sheet 6 and the liquid crystal display panel 1 to protect the liquid crystal display panel 1 from external impact.

In addition, the upper case 2 is fixed to the side surface of the mold frame 4 to protect the mold frame 4 from external impact and to fix the liquid crystal display panel 1 to prevent vibration. In addition, the upper case 2 applies the physical force to the cushion tape 7 through the liquid crystal display panel 1, thereby providing the cushion tape 7, the protective sheet 6, the inner sheet 5, The light guide plate 3 and the reflecting plate 10 are fixed in close contact with each other to prevent the protective sheet 6, the inner sheet 5, the light guide plate 3, and the reflecting plate 10 from vibrating up and down by external impact.

As described above, fixing the liquid crystal display panel 1, the inner sheet 5, the light guide plate 3, and the reflecting plate 10 prevents sheet flow, tipping, and scratches between sheets due to external impact. This is to prevent a defect from occurring in the liquid crystal display device.

Vibration of the liquid crystal display panel 1, the inner sheet 5, the light guide plate 3, and the reflector 10 may be divided into vertical vibration and horizontal vibration. The vertical vibration may be divided into a lower sheet by the cushion tape 7 described above. Can be effectively prevented by fixing them and fixing the liquid crystal display panel 1 and the lower sheets by the upper case 2. However, such fixing by the cushion tape 7 and the upper case 2 is not effective in preventing horizontal vibration.

Since the light guide plate 3 is thicker and relatively heavy than the protective sheet 6 and the inner sheet 5, the lamp is damaged due to the vibration of the light guide plate 3 when the horizontal vibration occurs, and the lower sheet is scratched. This may cause damage to the light guide plate 3 itself due to a collision with the mold frame 4. Therefore, by fixing the light guide plate 3 by forming a fixing part inside the mold frame 4, the lamp is damaged due to horizontal vibration, scratches of the lower sheets, and the light guide plate 3 is caused by the collision with the mold frame 4. In order to prevent problems such as damage to itself, the internal structure of the above-described mold frame 4 will be described in detail with reference to the accompanying drawings.

3A is a plan view illustrating a fastening structure of a mold frame and a light guide plate, and FIG. 3B is a plan view illustrating another example of a fastening structure of a mold frame and a light guide plate in FIG. 3A.

Referring to FIG. 3A, a lamp insertion groove 9 is provided in the mold frame 4 so that the lamp 8 is fixed inside the insertion groove 9. Concave portions F1 for preventing the movement of the light guide plate 3 are formed on both side surfaces of the mold frame 4, and the concave portions F1 have a concave-convex shape having a set width. On the other hand, the light guide plate 3 is manufactured in a concave-convex shape having a convex portion F1 'corresponding to the concave portion F1 of the mold frame 4, and the flow preventing concave portion F1 of the mold frame 4. ) And the convex portion F1 ′ of the light guide plate 3 are engaged with each other. That is, the horizontal vibration due to external impact is prevented by the combination of the concave portion F1 of the mold frame 4 and the convex portion F1 ′ of the light guide plate 3.

3B, a lamp insertion groove 9 is provided in the mold frame 4 as shown in FIG. 3A, and the lamp 8 is fixed inside the insertion groove 9. Convex portions F2 for preventing movement of the light guide plate 3 are formed on both side surfaces of the mold frame 4, and the convex portions F2 are formed in an uneven shape having a set width. Meanwhile, both side surfaces of the light guide plate 3 are formed with a concave portion F2 ′ corresponding to the convex portion F2 of the mold frame 4, and the convex portion F2 and the light guide plate of the mold frame 4 are formed. The concave portion F2 'of (3) is engaged to be engaged, thereby preventing horizontal vibration due to external impact.

The flow preventing recesses F1 and the convex portions F2 in the mold frame 4 as described above prevent horizontal vibration of the light guide plate 3 so that the lamp 8 is broken, scratches of the lower sheets, and the light guide plate 3 are prevented. ) It can prevent damage to itself.

On the other hand, when an external impact of the liquid crystal display occurs, concentrated stress is generated around the concave portion F1 and the convex portion F2 inside the mold frame 4. That is, stronger pressure is generated from the concave portion F1 and the convex portion F2 than the other surface inside the mold frame 4, so that the concave portion F1 and the inner portion of the mold frame 4 are concentrated. A part of the light guide plate 3 in contact with the convex portion F2 may be damaged.

In addition, the effective display area A cannot be set in a space in which the concave portion F1 or the convex portion F2 is formed in the mold frame 4. Usually, the effective display area A of the liquid crystal display device is set in a rectangular shape. When the recess F1 or the protrusion F2 is formed in the mold frame 4, the recess of the mold frame 4 is formed. A rectangular effective display area A cannot be set in an area where F1 or the convex portion F2 and the convex portion F1 'or the concave portion F2' of the light guide plate 3 are fastened. Therefore, the effective display area A is reduced by the space reserved for the formation of the concave portion F1 or the convex portion F2.

In addition, since the light of the lamp 8 is uniformly diffused in the concave portion F1 or the convex portion F2 of the mold frame 4 set outside the effective display area A of the light guide plate, unnecessary light Use occurs and light use efficiency is reduced. That is, since the light of the lamp 8 emitted by the set amount leaks to the recess F1 or the convex part F2 of the mold frame 4, the luminance of the effective display area A is reduced.

As described above, due to the concave portion F1 and the convex portion F2 inside the mold frame 4 formed to prevent vibration of the light guide plate, horizontal vibration of the light guide plate can be prevented, but the light guide plate 3 itself Problems such as damage, a decrease in the effective display area A of the liquid crystal display, and a decrease in luminance are newly generated.

Accordingly, the present invention has been devised to solve the above-described problems, and an object of the present invention is to prevent breakage and vibration of the light guide plate due to an external impact of the liquid crystal display device, and to prevent light from falling outside the effective display area on the light guide plate. The present invention provides a fastening structure of a light guide plate and a mold frame of a liquid crystal display device that improves light efficiency and realizes high brightness by reducing the leakage and unnecessary use.

The fastening structure of the light guide plate and the mold frame of the liquid crystal display device for achieving the object of the present invention is fixed to the liquid crystal panel and the lamp, the mold frame is formed at a predetermined angle at least one corner; And a light guide plate guiding the light emitted from the lamp to the liquid crystal panel, wherein a light guide plate having an inclined surface having a predetermined angle contacting the protrusion of the mold frame is formed at at least one corner thereof. The inclined surfaces of the protrusion and the light guide plate are brought into contact with each other and fastened.

Referring to the light guide plate and the mold frame 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 an exemplary view showing a fastening state between a mold frame and a light guide plate according to the first embodiment of the present invention.

4, a lamp insertion groove 109 provided in the mold frame 4, a lamp 108 inserted into and fixed inside the lamp insertion groove 109, and the lamp 108 from It guides the light evenly, and protects and fixes the light guide plate 103 formed with the inclined surface at a predetermined angle at four corners, and the liquid crystal panel, the light guide plate and the lamp, and a protrusion set at a constant angle at the four inner corners. It is configured to include a mold frame 104 is formed (F101).

The lamp insertion groove 109 is provided in the mold frame 104, and the lamp 108 is inserted into the insertion groove 109 and fixed, thereby scattering light due to the vibration of the lamp 108. To prevent.

In addition, the mold frame 104 mounts a liquid crystal panel (not shown), the light guide plate 103, the lamp 108, and the like, to protect and fix the external impact. Protruding portions F101 having inclined surfaces set at a predetermined angle are formed at four corners of the inside of the mold frame 104, and inclined surfaces cut at a predetermined angle are formed at the light guide plate 103, and protrusions in the mold frame 104 are formed. (F101) and the inclined surfaces of the light guide plate 103 are in contact with each other and fixed. At this time, the inclination angle of the protrusion F101 of the mold frame 104 and the inclination angle of the inclined surface of the light guide plate 103 should be the same.

In addition, the inclination angle of the protrusion part F101 of the mold frame 104 and the inclination angle of the inclined plane of the light guide plate 103 may be differently described by the thickness, size, etc. of the light guide plate 103. That is, when the thickness and size of the light guide plate 103 are increased, the weight of the light guide plate is increased, and horizontal vibration may occur more severely. Therefore, the inclination angle of the protrusion F101 of the mold frame 104 and the inclination angle of the inclined plane of the light guide plate 103 should be made larger, thereby increasing the horizontal fixing force.

The inclined surface of the light guide plate 103 and the protrusion F101 of the mold frame 104 will be described in detail with reference to the accompanying drawings.

5A is a perspective view of a light guide plate according to a first embodiment of the present invention, FIG. 5B is a front and side views of the light guide plate of FIG. 5A, and FIG. 5C is a protrusion of a mold frame according to the first embodiment of the present invention. The figure shown.

Referring to the drawing, an inclined surface F102 is formed at one side of four corners of the light guide plate 103 at a predetermined angle. The inclined surface F102 may not be formed at all four corners, and the angle of the inclined surface F102 may be flexibly determined according to the size, thickness, etc. of the light guide plate. The purpose of the inclined surface of the light guide plate 103 is to prevent vibration by engaging the protrusion of the mold frame 104 and fixing the light guide plate. Therefore, when the light guide plate 103 having a small area or a thin thickness is used, even if the angle of the inclined surface F102 is set gently, the fastening effect with the protrusions F101 of the mold frame 104 can be sufficiently obtained. When the thick light guide plate 103 is used, the angle of the inclined surface F102 is set to be large to increase the fastening force with the protruding portion F101 of the mold frame 104.

The inclined surface F102 of the light guide plate 103 is formed on three adjacent surfaces of the light guide plate 103, and the side and front surfaces of the light guide plate 103 have a constant inclination. As such, by forming the inclined surface F102 at the corner of the light guide plate 103, the entire light guide plate 103 can be used as the effective display area A ′.

Protruding portion (F102) is formed in the corner of the inside of the mold frame 104, which is an inclined surface of a predetermined angle, is fastened in contact with the inclined surface (F101) of the light guide plate 103 is seated in the mold frame (104).

The inclined angle F102 of the mold frame 104 may be adjusted according to the size, thickness, etc. of the light guide plate 103, like the inclined surface F101 of the light guide plate 103.

The above-described fastening structure of the mold frame 104 and the light guide plate 103 needs to reduce the effective display area A 'by the protrusions F101 inside the mold frame as compared with the conventional fastening structure of the mold frame and the light guide plate. There is no. That is, in the fastening structure of the mold frame 104 and the light guide plate 103 of the present invention, the concave portion and the convex portion of the conventional mold frame are removed, and then the inclined surface F102 set at an angle on one side of the corner of the light guide plate 103 is provided. And a protrusion F101 set at a predetermined angle on one side of the corner of the inside of the mold frame 104, and the mold frame 104 and the light guide plate 103 are formed on the protrusion F101 and the inclined surface F102 on one side of the corner of the mold frame 104. By making contact, since it is not necessary to reduce the effective display area A 'like the conventional recessed part and convex part, the effective display area A' can be used widely and brightness can be improved.

In addition, when the mold frame and the light guide plate are conventionally fastened, the edge of the light guide plate in contact with the fixing part is damaged due to the phenomenon that pressure is concentrated by an external impact on the fixing part inside the mold frame. The fastening part was formed to contact the inclined surface with a predetermined inclination and solved by dispersing the physical force by external impact.

As described above, the fastening structure of the light guide plate and the mold frame of the liquid crystal display device according to the present invention is fastened by the inclined surface of the light guide plate having a predetermined angle and the protrusion of the mold frame, thereby preventing horizontal vibration of the light guide plate, The physical force may be dispersed to prevent breakage of the light guide plate, and as the light guide plate and the mold frame are coupled to one side of the edges, the effective display area of the liquid crystal display may be extended, thereby improving luminance.

1 is a plan view showing an appearance of a liquid crystal display device generally used.

Figure 2 shows a cross section of I-I in Figure 1;

Figure 3a is a plan view showing a fastening structure of the mold frame and the light guide plate.

Figure 3b is a plan view showing another example of the mold frame and the light guide plate fastening structure in Figure 3a.

Figure 4 is an exemplary view showing a fastening state of the mold frame and the light guide plate according to the first embodiment of the present invention.

5A is a perspective view of a light guide plate according to the first embodiment of the present invention;

FIG. 5B is a front and side view of the shape of the light guide plate of FIG. 5A; FIG.

Figure 5c is a view showing the protrusion of the mold frame according to the first embodiment of the present invention.

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

103: light guide plate 104: mold frame

108: backlight 109: backlight insertion groove

A ': effective display area F101: protrusion

Claims (4)

A mold frame fixing the liquid crystal panel and the lamp and having protrusions having a predetermined angle set at at least one corner thereof; And a light guide plate guiding the light emitted from the lamp to the liquid crystal panel, the light guide plate having an inclined surface having a predetermined angle contacting the protrusion of the mold frame at at least one corner thereof. rescue. The fastening structure of the mold frame and the light guide plate of the liquid crystal display device according to claim 1, wherein the inclination angle of the mold frame protrusions in contact with each other and the inclination angle of the inclined surface of the light guide plate are the same. 2. The fastening structure of a mold frame and a light guide plate of the liquid crystal display device according to claim 1, wherein the inclination angle of the inclined surface of the light guide plate is determined by the size and thickness of the light guide plate. The fastening structure of the mold frame and the light guide plate of the liquid crystal display device according to claim 1, wherein the inclined surfaces of the light guide plate are formed on three adjacent surfaces.