CN101178507A - Liquid crystal display device with a light guide plate - Google Patents

Abstract

The invention discloses a liquid crystal display, which comprises a backlight component, a liquid crystal display panel, a front frame and a light bar. The backlight assembly comprises a back plate and a light guide plate, wherein the back plate is provided with a plurality of side walls and an opening, and the opening is opposite to one of the side walls. The light guide plate is arranged in the back plate and is suitable for entering and exiting the back plate through the opening. The light guide plate is provided with a light incident surface, and the opening is exposed out of the light incident surface. The liquid crystal display panel is arranged on the back plate of the backlight assembly, and the front frame is assembled with the back plate to fix the liquid crystal display panel. The light bar is arranged on the inner wall of the front frame and is positioned between the front frame and the light incident surface of the light guide plate. Therefore, the heat generated by the light bar can be conducted to the front frame so as to improve the luminous efficiency of the light bar.

Description

LCD Monitor

technical field

The present invention relates to a display, and in particular to a liquid crystal display.

Background technique

Due to the increasing demand for displays, the industry is fully committed to the development of related displays. Among them, the cathode ray tube (Cathode Ray Tube) has been monopolizing the display market for many years due to its excellent display quality and technological maturity. However, due to the rise of the concept of green environmental protection, the characteristics of large energy consumption and large radiation, and the limited space for product flattening, it cannot meet the market demand for light, thin, short, small, beautiful and low power consumption. market trends. Therefore, thin film transistor liquid crystal displays (Thin Film Transistor Liquid Crystal Display, TFT-LCD) with superior characteristics such as high image quality, good space utilization efficiency, low power consumption, and no radiation have gradually become the mainstream of the market.

For TFT-LCD module, it is mainly composed of a liquid crystal display panel and a backlight module. Among them, the liquid crystal display panel is usually composed of a thin film transistor array substrate (thin film transistor array substrate), a color filter substrate (color filter substrate) and a liquid crystal layer arranged between the two substrates, and the backlight assembly is used to provide The surface light source required by the liquid crystal display panel enables the liquid crystal display components to achieve the display effect.

FIG. 1A is a top view of a conventional backlight assembly, and FIG. 1B is a cross-sectional view of the conventional backlight assembly of FIG. 1A . 1A and 1B, the existing backlight assembly 100 includes a backplane 110, a light guide plate (Light Guide Plate, LGP) 120, a flexible printed circuit board (Flexible Printed Circuit, FPC) 130, a plurality of light emitting diodes (Light Emitting Diode, LED) 140, a reflector 150, several layers of optical films 160 and a plastic frame 170. Wherein, the light guide plate 120 is disposed on the back plate 110 , and the reflection sheet 150 is disposed between the light guide plate 120 and the back plate 110 . The light emitting diodes 140 are disposed on the flexible circuit board 130 and located beside the light guide plate 120 . In addition, the plastic frame 170 is disposed on the back plate 110 , and the optical film 160 is disposed between the plastic frame 170 and the light guide plate 120 .

Since the light emitting diode 140 will generate heat energy during operation, and the higher the temperature, the luminous efficiency of the light emitting diode 140 will be reduced. Therefore, as the size of the existing backlight assembly 100 using the light emitting diode 140 increases, the heat dissipation requirement will become larger. The focus of the design. In addition, due to the low thermal conductivity of the plastic frame 170 , the heat energy generated by the LED 140 is not easily transmitted to the outside.

Contents of the invention

The object of the present invention is to provide a liquid crystal display to improve heat dissipation efficiency.

To achieve the above and other objectives, the present invention provides a liquid crystal display, which includes a backlight assembly, a liquid crystal display panel, a front frame and a light bar. The backlight assembly includes a back plate and a light guide plate, wherein the back plate has a plurality of side walls and an opening, and the opening faces one of the side walls. The light guide plate is configured in the back plate, and the light guide plate is suitable for passing in and out of the back plate through the opening. The light guide plate has a light incident surface, and the opening exposes the light incident surface. The liquid crystal display panel is arranged on the back plate of the backlight assembly, and the front frame is assembled with the back plate to fix the liquid crystal display panel. The light bar is arranged on the inner wall of the front frame, and is located between the front frame and the light incident surface of the light guide plate.

In an embodiment of the present invention, the light bar includes a carrier and a plurality of point light sources arranged on the carrier.

In an embodiment of the present invention, the liquid crystal display further includes a heat dissipation layer disposed between the front frame and the light bar.

In an embodiment of the invention, the tops of the sidewalls are bent into an L shape to support the liquid crystal display panel.

In an embodiment of the present invention, the backlight assembly further includes a buffer strip disposed between the liquid crystal display panel and the light guide plate.

In an embodiment of the present invention, the backlight assembly further includes a reflection sheet disposed between the buffer bar and the light guide plate.

In an embodiment of the present invention, the top end of the side wall of the front frame close to the light incident surface is bent into an L shape.

In an embodiment of the present invention, the backlight assembly further includes a plurality of fixing blocks disposed at corners of the backplane.

In an embodiment of the present invention, the point light sources are, for example, light emitting diodes (Light Emitting Diode, LED) or organic light emitting diodes (Organic Light Emitting Diode, OLED).

In an embodiment of the invention, the material of the front frame includes metal.

Based on the above, since the present invention combines the light bar with the front frame, the heat generated by the light bar can be conducted to the outside through the front frame, so as to avoid local overheating and affect the luminous efficiency of the light bar. In addition, compared with the prior art that uses a plastic frame to support the liquid crystal display panel, the present invention directly uses the back plate to support the liquid crystal display panel, so the present invention can save the cost of the plastic frame.

In order to make the above and other objects, features and advantages of the present invention more comprehensible, preferred embodiments are exemplified below and described in detail with accompanying drawings.

Description of drawings

FIG. 1A is a top view of a conventional backlight assembly.

FIG. 1B is a cross-sectional view of the conventional backlight assembly shown in FIG. 1A.

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

FIG. 2B is a cross-sectional view of a liquid crystal display according to an embodiment of the present invention.

FIG. 3 is an exploded view of the backlight assembly of FIG. 2A.

FIG. 4 is a combination diagram of the backlight assembly and the liquid crystal display panel of FIG. 2A .

FIG. 5 is a combination diagram of the front frame and the light bar in FIG. 2A .

FIG. 6 is a combination diagram of the front frame and the back panel of FIG. 2A .

Detailed ways

FIG. 2A is an exploded view of a liquid crystal display according to an embodiment of the present invention, and FIG. 2B is a cross-sectional view of a liquid crystal display according to an embodiment of the present invention. Please refer to FIG. 2A and FIG. 2B , the liquid crystal display 200 of this embodiment includes a backlight assembly 2100 , a liquid crystal display panel 2200 , a front frame 2300 and a light bar 2400 . The detailed structure of each component will be described in detail later.

FIG. 3 is an exploded view of the backlight assembly of FIG. 2A. 2A and FIG. 3, the backlight assembly 2100 includes a backplane 2110 and a light guide plate 2120, wherein the backplane 2110 has a plurality of sidewalls 2112 and an opening 2110a, and the opening 2110a is disposed on one of the sidewalls 2112. opposite. The light guide plate 2120 is disposed in the back plate 2110, and the light guide plate 2120 is adapted to enter and exit the back plate 2110 through the opening 2110a. In other words, the light guide plate 2120 can be assembled with the back plate 2110 in a detachable manner, so the backlight assembly 2100 is more convenient for rework. In addition, the light guide plate 2120 has a light incident surface 2120a, and the opening 2110a exposes the light incident surface 2120a.

In order to improve the optical quality of the backlight assembly 2100, the backlight assembly 2100 may also include at least one first optical film 2130 and at least one second optical film 2140, wherein the first optical film 2130 is disposed between the back plate 2110 and the light guide plate 2120 The second optical film 2140 is disposed between the liquid crystal display panel 2200 and the light guide plate 2120 . In more detail, the first optical film 2130 is, for example, a reflection sheet, a diamond sheet, or other types of optical film, and the second optical film 2140 is, for example, a diffusion sheet, a Brightness Enhancement Film (BEF), a double Brightness Enhancement Film (Dual Brightness Enhancement Film, DBEF) or other types of optical films. In addition, the backlight assembly 2100 may also include a plurality of fixing blocks 2150 disposed at corners of the backplane 2110 . The fixing block 2150 can not only fix the positions of the light guide plate 2120 , the first optical film 2130 and the second optical film 2140 , but also improve reliability and improve light leakage. In addition, the material of the fixing block 2150 is rubber, for example.

FIG. 4 is a combination diagram of the backlight assembly and the liquid crystal display panel of FIG. 2A . Please refer to FIG. 3 and FIG. 4 , the liquid crystal display panel 2200 is disposed on the backplane 2110 of the backlight assembly 2100 . In more detail, the tops 2112 a of the sidewalls 2112 of the back plate 2110 are bent into an L shape to support the liquid crystal display panel 2200 . In addition, the backlight assembly 2100 further includes a buffer strip 2160 disposed between the liquid crystal display panel 2200 and the light guide plate 2110 . In this embodiment, the tops 2112 a of the side walls 2112 are coplanar with the tops of the buffer strips 2160 , so as to support the liquid crystal display panel 2200 . In addition, when the backlight assembly 2100 includes the second optical film 2140 , the buffer bar 2160 can also be disposed on the second optical film 2140 . In this embodiment, the backlight assembly 2100 further includes a reflective sheet 2170 disposed between the buffer bar 2160 and the light guide plate 2120 .

FIG. 5 is a combination diagram of the front frame and the light bar in FIG. 2A . Referring to FIG. 2B and FIG. 5 , the light bar 2400 is disposed on the inner wall of the front frame 2300 and located between the front frame 2300 and the light incident surface 2120 a of the light guide plate 2120 . In addition, the material of the front frame 2300 is, for example, iron, stainless steel or other materials with high thermal conductivity. In addition, the light bar 2400 includes a carrier 2410 and a plurality of point light sources 2420 disposed on the carrier 2410 . In more detail, the carrier 2410 is, for example, a metal core printed circuit board (MCPCB), a flexible circuit board or other carriers with high thermal conductivity. The point light sources 2420 are, for example, light emitting diodes or organic light emitting diodes. In addition, in order to increase heat dissipation efficiency, the liquid crystal display 200 further includes a heat dissipation layer 2500 disposed between the front frame 2300 and the light bar 2400 .

FIG. 6 is a combination diagram of the front frame and the back panel of FIG. 2A . Please refer to FIG. 2B and FIG. 6 , the front frame 2300 is assembled with the back plate 2110 to fix the liquid crystal display panel 2200 . In more detail, the top 2300 a of the side wall of the front frame 2300 near the light incident surface 2120 a is bent into an L shape, so as to be assembled with the back plate 2110 .

In summary, the liquid crystal display of the present invention has at least the following advantages:

1. In the present invention, the light bar is arranged on the inner wall of the front frame, and the front frame is usually made of a material with high thermal conductivity (such as iron or stainless steel), so the heat generated by the light bar can be conducted to the outside through the front frame In order to avoid the local temperature being too high and affecting the luminous efficiency of the light bar.

2. Compared with the prior art that uses a plastic frame to support the liquid crystal display panel, the present invention directly uses the back plate to support the liquid crystal display panel, so the cost of the plastic frame can be saved in the present invention.

3. Since the back plate has an opening for pulling out or assembling the light guide plate, the first optical film and the second optical film, the liquid crystal display of the present invention is convenient for rework and assembly.

Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention, and any person with ordinary knowledge in the technical field of the present invention can make some changes without departing from the spirit and scope of the present invention. and modification, so the protection scope of the present invention should be defined by the claims.

Claims (10)

1. LCD comprises:

One backlight assembly comprises:

One backboard has a plurality of sidewalls and an opening, and this opening and those sidewalls one of them face mutually;

One light guide plate be disposed in this backboard, and this light guide plate is suitable for passing in and out this backboard via this opening, and this light guide plate has an incidence surface, and this opening exposes this incidence surface;

One display panels is disposed on this backboard of this backlight assembly;

Frame before one is with this backboard assembling, to fix this display panels; And

One lamp bar is disposed on the inwall of this preceding frame, and between this incidence surface of this preceding frame and this light guide plate.

2. LCD as claimed in claim 1 is characterized in that, this lamp bar comprises a carrier and a plurality of pointolites that are disposed on this carrier.

3. LCD as claimed in claim 1 is characterized in that, also comprises a heat dissipating layer, is disposed between this preceding frame and this lamp bar.

4. LCD as claimed in claim 1 is characterized in that the top of those sidewalls is L shaped for being bent into, to support this display panels.

5. LCD as claimed in claim 1 is characterized in that this backlight assembly also comprises a buffer bar, is disposed between this display panels and this light guide plate.

6. LCD as claimed in claim 5 is characterized in that this backlight assembly also comprises a reflector plate, is disposed between this buffer bar and this light guide plate.

7. LCD as claimed in claim 1 is characterized in that, this preceding frame is L shaped for being bent near the top of the sidewall of this incidence surface.

8. LCD as claimed in claim 1 is characterized in that this backlight assembly also comprises a plurality of fixed blocks, is disposed at the corner of this backboard.

9. LCD as claimed in claim 1 is characterized in that those pointolites comprise light emitting diode or Organic Light Emitting Diode.

10. LCD as claimed in claim 1 is characterized in that the material of this preceding frame comprises metal.

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