CN101464592A - Liquid crystal display device with a light guide plate - Google Patents

Abstract

The present invention relates to a liquid crystal display, comprising a first frame, a light guide plate, a second frame, a light emitting diode and a liquid crystal panel. The light guide plate is arranged on the first frame, and the light guide plate has a light incident surface. The second frame covers a portion of the light guide plate. The light emitting diode is arranged inside the second frame and adjacent to the light incident surface of the light guide plate. The liquid crystal panel is located between the second frame and the light guide plate.

Description

LCD Monitor

technical field

The invention relates to a liquid crystal display, in particular to a liquid crystal display whose light source is a light emitting diode.

Background technique

At present, light emitting diodes (light emitting diodes, LEDs) are applied to display light sources, and light bar manufacturing methods are mostly used, that is, the light emitting diodes are first fixed on the carrier substrate to form a light bar, and then through the light bar and the plastic frame. Some components of the backlight module such as the light guide plate are combined to form the light source of the backlight module.

Please refer to FIG. 1 for a schematic diagram of the structure of an existing liquid crystal display. Generally, in the liquid crystal display 10 , the light source is a light bar 15 . The light bar 15 is formed by combining the light emitting diodes 11 and the carrier substrate 12 , and the light bar 15 is fixed on the plastic frame 13 . Therefore, in order to manufacture the liquid crystal display 10 as shown in FIG. 1 , the LED 11 must be combined with the carrier substrate 12 to form the light bar 15 first. Since the light bar 15 needs to be assembled first, and then the subsequent assembly is performed, the assembly process of the liquid crystal display 10 is relatively complicated. Furthermore, since the light strip 15 is fixed on the plastic frame 13 , the light emitting diode 11 can dissipate heat through the fixed rubber strip 14 , and can also dissipate heat through the supporting substrate 12 and the plastic frame 13 . However, the heat dissipation path through the carrier substrate 12 and the plastic frame 13 is long, and the light emitting diodes 11 of the light bar 15 tend to suffer from poor heat dissipation.

To sum up, if the light emitting diodes 11 are first fixed on the carrier substrate 12 to form the light bar 15 in the prior art, the manufacturing cost will be increased because the carrier substrate 12 is needed; in addition, because the thickness of the carrier substrate 12 is relatively Thick, so that the distance between the light-emitting surface of the light-emitting diode 11 and the display panel is shortened, and the ratio (A/P ratio) of "the distance P between the light-emitting diodes 11" and "the distance A between the light-emitting diode and the display panel" is smaller , so if the design or device is not good, it may cause the headlight effect (headlight effect), or the light mixing distance is reduced, so that the light mixing effect is not perfect; The heat dissipation effect of the light-emitting diode is greatly reduced, so the light-emitting function, service life and quality of the light-emitting diode will be reduced. Due to the above-mentioned shortcomings, these shortcomings must be improved to increase product competitiveness.

Contents of the invention

In view of this, the main purpose of the present invention is to provide a liquid crystal display with lower production cost, better optical quality and stable luminous efficiency.

To achieve the above object, the present invention provides a liquid crystal display, which includes a first frame, a light guide plate, a second frame, a light emitting diode and a liquid crystal panel. The light guide plate is arranged on the first frame, and the light guide plate has a light incident surface. The second frame covers part of the light guide plate. The light emitting diode is arranged inside the second frame and adjacent to the light incident surface of the light guide plate. The liquid crystal panel is located between the second frame and the light guide plate for displaying pictures.

In the liquid crystal display provided by the present invention, the material of the second frame is not limited, preferably metal, more preferably iron. In addition, the liquid crystal display of the present invention may also include a circuit layer and an insulating layer, wherein the circuit layer is disposed between the second frame and the LED, and the insulating layer is disposed between the circuit layer and the second frame. Wherein, the material of the insulating layer is preferably plastic, aluminum oxide or a mixture thereof.

The liquid crystal display of the present invention further includes a plurality of optical films, wherein the optical films are located between the light guide plate and the liquid crystal panel. And the composition of the optical film is not limited, it is preferably a diffusion film, an enhancement film or a combination thereof. In addition, the shape of the light guide plate is not limited, and it is preferably a wedge-shaped plate, a flat plate, or other forms of light guide plate. In addition, the liquid crystal display of the present invention may further include a reflective sheet, wherein the reflective sheet is disposed between the light guide plate and the first frame.

The beneficial effect of the present invention is that the production cost can be reduced because the liquid crystal display proposed by the present invention does not use the existing carrying base material. In addition, in the liquid crystal display proposed by the present invention, the distance between the light-emitting diode light-emitting surface and the display panel is relatively large, so the ratio (A/P Ratio), to avoid the headlight effect, thereby improving the optical quality. In addition, in the liquid crystal display proposed by the present invention, the light mixing distance is longer, which can make the light mixing effect more perfect. Through the structural design of the liquid crystal display of the present invention, the heat dissipation effect of the light source can be greatly improved, and it has a significant effect on stabilizing the light-emitting function, life and quality of the light-emitting diode.

Description of drawings

Fig. 1 is a sectional view of an existing liquid crystal display;

Fig. 2 is the sectional view of the liquid crystal display of a preferred embodiment of the present invention;

FIG. 3 is a partially enlarged schematic diagram of the liquid crystal display in FIG. 2 .

[Description of main component symbols]

Liquid Crystal Display 10, 21 Light Emitting Diode 11, 25 Carrying Substrate 12

Rubber frame 13 Fixed rubber strip 14 LCD panel 22

Upper board 221 Lower board 222 First frame 23

Second frame 24 Top plate 241 Side wall 242

Bottom plate 243 Light-emitting surface 251 Circuit layer 252

Insulation layer 253 Light guide plate 26 Light incident surface 261

Optical film 27 Reflector 28 Light bar 15

Detailed ways

Please refer to FIG. 2 , which is a cross-sectional view of a liquid crystal display according to an embodiment of the present invention. As can be seen from FIG. 2 , the liquid crystal display 21 of this embodiment mainly includes a first frame 23 , a light guide plate 26 , a second frame 24 , a plurality of LEDs 25 and a liquid crystal panel 22 . The light guide plate 26 is disposed on the first frame 23 , and the light guide plate 26 has a light incident surface 261 . The second frame 24 is disposed above the light guide plate 26 . The light emitting diodes 25 are disposed inside the second frame 24 and adjacent to the light incident surface 261 of the light guide plate 26 . Wherein, the light emitting diode 25 can be a surface mount type light emitting diode component.

Based on the above, the liquid crystal panel 22 is mainly used for displaying images, located in the accommodating space of the second frame 24 and disposed on the light guide plate 26 . Wherein, the liquid crystal panel 22 has an upper plate 221 , a lower plate 222 and a liquid crystal layer (not shown), and the liquid crystal layer is located between the upper plate 221 and the lower plate 222 . In this embodiment, the upper board 221 is a color filter substrate, and the lower board 222 is a thin film transistor array substrate.

Moreover, the liquid crystal display 21 of this embodiment further includes a plurality of optical films 27 , wherein the optical films 27 are located between the light guide plate 26 and the liquid crystal panel 22 . And these optical film sheets 27 can be diffusion sheets, brightness enhancement sheets or a combination thereof. In addition, the light guide plate 26 can be a wedge plate, a flat plate, or other forms of light guide plate. In addition, the liquid crystal display 21 may further include a reflective sheet 28 disposed between the light guide plate 26 and the first frame 23 .

More specifically, the second frame 24 includes a top plate 241 , a bottom plate 243 , and a side wall 242 connecting the top plate 241 and the bottom plate 243 . An accommodating space is formed among the top board 241 , the bottom board 243 and the side wall 242 . The center of the top plate 241 can be a hollow structure, and the material of the second frame 24 can be metal, and in this embodiment, the material of the second frame 24 is iron.

The liquid crystal display 21 of the present invention also includes a circuit layer 252 and an insulating layer 253, wherein the circuit layer 252 is arranged between the second frame 24 and the light emitting diode 25, and the insulating layer 253 is arranged between the circuit layer 252 and the second frame 24 between. The material of the insulating layer 253 can be plastic, aluminum oxide or a mixture thereof; the circuit layer 252 can be connected to a power supply (not shown).

FIG. 3 is a partially enlarged schematic diagram of the liquid crystal display in FIG. 2 . Please refer to FIG. 2 and FIG. 3 together. In this embodiment, the light emitting diodes 25 are disposed on the sidewall 242 of the second frame 24 . The distance between the light emitting diodes 25 is not limited. In this embodiment, the distance between adjacent light emitting diodes 25 is the same, and the distance between the adjacent light emitting diodes 25 and the distance between the light emitting diodes 25 and the display panel 22 ratio, it is greater than 0.8. Moreover, the light emitting diode 25 has a light emitting surface 251 , because the present embodiment uses a top emitting light emitting diode 25 , so the light emitting surface 251 corresponds to the light incident surface 261 of the light guide plate 26 .

Please continue to refer to FIG. 2 and FIG. 3, by coating the insulating layer 253 on the side wall 242 of the second frame 24, and then laying out the circuit layer 252 and the light emitting diode 25 on the insulating layer 253, and connecting the circuit layer 252 to the A power supply (not shown in the figure) can complete the liquid crystal display 21 of this embodiment. In other words, in the liquid crystal display 21 of this embodiment, the light emitting diodes 25 are directly combined with the metal second frame 24 , so there is no need to carry out the steps of combining the existing light bar and various components, thus simplifying the assembly procedure of the liquid crystal display 21 .

It can be seen from the above that by using the structure of the liquid crystal display of the present invention, the cost of the light bar bearing substrate can be omitted, the light bar assembly process can be reduced, and economic benefits such as cost reduction can be achieved, thereby improving product competitiveness. In addition, the liquid crystal display of the present invention also has excellent optical quality. The light-emitting diodes are arranged on the metal frame, which can increase the distance between the light-emitting surface of the light-emitting diodes and the display area of the liquid crystal panel. When applied to white light-emitting diodes, the effect of headlights can be improved. If it is used for red, green or blue light emission On the diode, the light mixing distance can be increased. Moreover, the light-emitting diodes of the present invention are arranged on the iron frame, so the light-emitting diodes can dissipate heat directly through the iron frame, which greatly improves the heat dissipation effect. It can be seen that the present invention can stabilize the light-emitting function, life, chromaticity, etc. of the light-emitting diodes. Therefore, the present invention The invented liquid crystal display has good stability.

The above-mentioned embodiments are only examples for convenience of description, and the scope of rights claimed by the present invention should be based on the scope of the patent application, rather than limited to the above-mentioned embodiments.

Claims (8)

1, a kind of LCD is characterized in that comprising:

One first framework;

One light guide plate be arranged on this first framework, and this light guide plate has an incidence surface;

One second framework is arranged at the top of this light guide plate;

One light emitting diode is arranged at this second framework inboard and is close to this incidence surface of this light guide plate; And

One liquid crystal panel is between this second framework and this light guide plate.

2, LCD as claimed in claim 1 is characterized in that, more comprises a circuit layer and an insulation course, and wherein this circuit layer is arranged between this second framework and this light emitting diode, and this insulation course is arranged between this circuit layer and this second framework.

3, LCD as claimed in claim 2 is characterized in that, the material of this insulation course is plastics, aluminium oxide or its potpourri.

4, LCD as claimed in claim 1 is characterized in that, also comprises a plurality of blooming pieces, and wherein these blooming pieces are between this light guide plate and this liquid crystal panel.

5, LCD as claimed in claim 4 is characterized in that, these blooming pieces are diffusion sheet, brightening piece or its combination.

6, LCD as claimed in claim 1 is characterized in that, also comprises a reflector plate, and wherein this reflector plate is arranged between this light guide plate and this first framework.

7, LCD as claimed in claim 1 is characterized in that, the material of this second framework is a metal.

8, LCD as claimed in claim 1 is characterized in that, this light guide plate is the light guide plate of clapboard, flat shape plate or other form.

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