CN201237679Y

CN201237679Y - LCD model with LED backlight

Info

Publication number: CN201237679Y
Application number: CNU2008200956458U
Authority: CN
Inventors: 吴育良; 蔡正伟; 吴海波
Original assignee: Tianma Microelectronics Co Ltd
Current assignee: Tianma Microelectronics Co Ltd
Priority date: 2008-07-18
Filing date: 2008-07-18
Publication date: 2009-05-13
Anticipated expiration: 2018-07-18

Abstract

The utility model relates to an LED backlight liquid crystal display module, comprising a liquid crystal panel, an LED backlight, a driving circuit board, a module frame, a flexible circuit board and a heat conducting structure. The heating conducting structure of panel shape is arranged between the LED backlight and the driving circuit board and clings to the LED backlight. The horizontal direction of the heat conducting structure has larger heat conducting coefficient than the vertical direction. Because of the heat conducting structure, the LED backlight liquid crystal display module adopting the technical proposal of the utility model strengthens the heat conducting speed of the LED backlight and the heat emitted by a LED light source unit can be radiated into air quicker by the module frame; at the same time, the heat conducting structure separates the LED backlight from the driving circuit board, so the thermal coupling and the alternating heat accumulation of the heat emitted by the LED backlight and the driving circuit board do not exit; the heat in the LED backlight plane and the temperature of the liquid crystal panel surface can be distributed evenly; uneven display phenomenon can not be caused by large temperature difference; consequently, display effect is improved.

Description

The LED-backlit LCD MODULE

Technical field

The utility model relates to a kind of LCD MODULE, particularly a kind of LED-backlit LCD MODULE.

Background technology

Lcd technology has been widely used in products such as computer screen, mobile phone, digital camera, Video Camera, PDA, onboard navigation system now.And liquid crystal panel is crucial display module, because itself is not luminous, a backlight module need be set just can show, backlight module and liquid crystal panel fit together and form complete LCD MODULE.

Fig. 1 is the sectional side view of existing LED-backlit LCD MODULE, present as seen from the figure general LED-backlit LCD MODULE includes: LED-backlit 1, liquid crystal panel 2, flexible PCB (FPC) 3, drive circuit board 4 and module frame 5, wherein LED-backlit 1 comprises framework 11 backlight (being made of a base plate and the upwardly extending sidewall of bottom edge), light guide plate 12 and led light source group 15.Led light source group 15 comprises led circuit plate 14 and setting LED wick 13 thereon again.Generally speaking, LED-backlit 1 one is to the problem that has poor heat radiation.In order to strengthen heat radiation, framework 11 backlight and module frame 5 are all made by metal material, and tend to fill heat-conducting glue 16 between the sidewall of led circuit plate 14 and framework backlight 11, make heat that LED wick 13 sends pass to the framework backlight 11 of metal material, and finally the module frame 5 by metal material diffuse to the external world via heat-conducting glue 16.But when the LED-backlit LCD MODULE is applied to require the environment of high brightness (as vehicle-mounted display device), be accompanied by high brightness this moment, will inevitably distribute a large amount of heat energy, only add a heat-conducting glue 6, often radiating effect is not good, cause near the temperature the LED wick 13 too high so these heat energy will constantly be accumulated, thereby not only cause LED-backlit 1 luminescence efficiency to reduce, and the serviceable life that can reduce LED-backlit 1.In the prior art, because drive circuit board 4 fits tightly with framework 11 backlight, heat energy interference on heat that components and parts send on the drive circuit board 4 and the framework backlight 11 not only can make heat dissipation problem more serious, the problem of thermal coupling and mutual heat history also can occur.

The utility model content

Technical problem to be solved in the utility model provides a kind of LED-backlit LCD MODULE, and it can effectively solve the problem of heat energy interference, thermal coupling and the mutual heat history of drive circuit board and LED-backlit.

For solving the problems of the technologies described above, the utility model adopts following technical scheme:

The LED-backlit LCD MODULE comprises: liquid crystal panel, LED-backlit, drive circuit board, module frame, flexible PCB and conductive structure; Described LED-backlit is arranged between liquid crystal panel and the drive circuit board, and LED-backlit and liquid crystal panel are close to; Described liquid crystal panel is connected with drive circuit board by the described flexible PCB that is arranged at a side; Described module frame is closed in the other parts of LED-backlit LCD MODULE in it, and the position of viewing area hollows out on corresponding liquid crystal panel, so that the liquid crystal panel content displayed as seen; Described LED-backlit LCD MODULE also comprises the flat conductive structure that is arranged between LED-backlit and the drive circuit board and is close to LED-backlit, and the in-plane coefficient of heat conductivity of described conductive structure is big and the thickness direction coefficient of heat conductivity is little.

Adopt the LED-backlit LCD MODULE of technical solutions of the utility model, the beneficial effect that is compared with the prior art is:

Owing between drive circuit board and LED-backlit, be provided with conductive structure, can strengthen the heat-transfer rate of LED-backlit, the heat that makes the led light source group send passes on the module frame quickly, and is dispersed in the air.Simultaneously, make heat that both distributed that the situation of thermal coupling and mutual heat history can not take place because this conductive structure is isolated LED-backlit and drive circuit board.At last, because the existence of this conductive structure makes heat evenly distribute in whole LED plane backlight, the Temperature Distribution on liquid crystal panel surface is also even relatively, so can not occur because of the uneven phenomenon of the excessive demonstration that causes of each space temperature variation, thereby promote display effect.

Description of drawings

Fig. 1 is the sectional side view of existing LED-backlit LCD MODULE;

Fig. 2 is the sectional side view of the utility model embodiment one LED-backlit LCD MODULE;

Fig. 3 is the sectional side view of the utility model embodiment two LED-backlit LCD MODULE.

Description of reference numerals is as follows:

1, LED-backlit 11, framework backlight 12, light guide plate

13, LED wick 14, led circuit plate 15, led light source group

16, heat-conducting glue 2, liquid crystal panel 3, flexible PCB

4, drive circuit board 5, module frame 6, conductive structure

Below in conjunction with accompanying drawing LED-backlit LCD MODULE of the present utility model is described in further detail.

Embodiment

Embodiment one

The LED-backlit LCD MODULE of this embodiment comprises as shown in Figure 2: LED-backlit 1, liquid crystal panel 2, flexible PCB 3, drive circuit board 4, module frame 5 and conductive structure 6.

Wherein LED-backlit 1 is that side-light type is backlight, comprises framework 11 backlight, light guide plate 12 and at least one led light source group 15.Framework 11 backlight is the concave frame structure, the sidewall that it has the bottom and extends upward formation from bottom margin.Light guide plate 12 is contained in the described framework backlight 11.Led light source group 15 also is arranged in the framework 11 backlight, and between position light guide plate 12 and the described sidewall and near sidewall.Led light source group 15 comprises that led circuit plate 14 and at least one are arranged at the LED wick 13 on the led circuit plate 14.Described led circuit plate 14 is electrically connected with drive circuit board 4, obtains electric power from drive circuit board 4.Because the LED-backlit LCD MODULE needs the picture of exhibit high brilliance, thereby need to adopt high-power LED wick 13.And can send a large amount of heat during great power LED wick 13 work.Generally can adopt the substrate manufacture led circuit plate 14 of aluminium or other metal material, the heat that makes LED wick 13 send passes to framework 11 backlight via led circuit plate 14.For the heat that makes LED wick 13 send passes to framework 11 backlight via led circuit plate 14 smoothly, also between led circuit plate 14 and framework backlight 11, be filled with heat-conducting glue 16.Liquid crystal panel 2 is arranged at LED-backlit 1 top, and is close to light guide plate 12.The light that LED wick 13 sends evenly illuminates liquid crystal panel 2 after via light guide plate 12.Liquid crystal panel 2 links to each other with drive circuit board 4 by the described flexible PCB 3 that is arranged at a side.Drive circuit board 4 is arranged at the below of framework 11 backlight, and be arranged in parallel with the bottom of framework 11 backlight.Module frame 5 is closed in the other parts of LED-backlit LCD MODULE in it, and the position of viewing area hollows out on corresponding liquid crystal panel 2, so that liquid crystal panel 2 content displayed as seen.

Because the existence of flexible PCB 3, the sidewall of the sidewall of module frame 5 and framework 11 backlight do not contact fully or contact area is very little, the heat that causes LED wick 13 to produce can not or can not pass to the air from right sidewall fully.Most of heat that LED wick 13 produces is delivered to after the side of framework 11 backlight via led circuit plate 14, heat-conducting glue 16, can not be directly passed to contiguous module frame 5, but need be delivered to its other end by the framework backlight 11 of metal material, and then pass to the module frame 5 of metal material, distribute to the external world again.In the past since drive circuit board 4 fit tightly with framework 11 backlight, the heat that components and parts send on the drive circuit board 4 will with the heat energy interference on the framework 11 backlight, not only can make heat dissipation problem more serious, the problem of thermal coupling and mutual heat history also can appear.The special feature of this embodiment just is, is provided with the conductive structure 6 of one flat plate shape between framework backlight 11 bottoms and the drive circuit board 4, thereby framework 11 backlight and drive circuit board 4 are separated.The bottom surface of the size of conductive structure 6 and framework backlight 11 is suitable, need extend at least LED-backlit 1 under.

Conductive structure 6 in this embodiment, the 2D anisotropy heat radiator that is to use native graphite to make can directly be bought from the market and obtains.This conductive structure 6 has bigger coefficient of heat conductivity along its in-plane, and is then less along the coefficient of heat conductivity of its thickness direction, generally has only 1% of in-plane coefficient of heat conductivity.This conductive structure 6 is close to framework 11 backlight, thereby it can help on the one hand framework 11 backlight to conduct heat to the relative other end of led light source group 15, components and parts institute thermal value on the isolated drive circuit plate 4 effectively on the other hand, drive circuit board 4 is played the effect of thermoshield, make the more serious problem of heat dissipation problem thereby avoid taking place heat energy interference, thermal coupling and mutual heat history etc.And, owing to be the side of led light source group 15, caused the temperature in this territory, lateral areas to be higher than opposite side at display module 2 in the past, just be presented as the Temperature Distribution imbalance that each is regional on the liquid crystal panel 2, the brightness meeting of final display frame is inhomogeneous.This embodiment is provided with after the conductive structure 6, the coefficient of heat conductivity of in-plane increases greatly, so the temperature difference of the left and right sides also can reduce greatly, temperature planar can become and evenly distribute, and the phenomenon of display frame brightness irregularities also can alleviate a lot even disappear.

Embodiment two

As shown in Figure 3, the LED-backlit LCD MODULE of this embodiment, it comprises two groups of led light source groups 15, be arranged at the both sides of LED-backlit LCD MODULE respectively, the side light type LED back light LCD MODULE that belongs to the two ends light inlet, the effect of its conductive structure 6 is similar to embodiment one, is not described in detail in this.The area and the thickness of the conductive structure 6 that this embodiment is announced are not desired to be limited at this, can in the light of actual conditions be adjusted.At different types of LED-backlit LCD MODULE interior heat amount accumulation situation, the thickness of its inner conductive structure, area, material and coefficient of heat conductivity, all visual actual conditions are adjusted and should be belonged to should be with novel included scope.

In sum, LED-backlit liquid crystal display module provided by the utility model increases inner heat-transfer rate by setting up conductive structure 6, has improved radiating effect.This conductive structure 6 also makes LED-backlit 1 and drive circuit board 4 shield mutually in addition, and the Temperature Distribution on the liquid crystal panel 2 is also more even, has avoided occurring showing uneven phenomenon.

Above content be in conjunction with concrete preferred implementation to further describing that the utility model is done, can not assert that concrete enforcement of the present utility model is confined to these explanations.For the utility model person of an ordinary skill in the technical field, under the prerequisite that does not break away from the utility model design, can also make some simple deduction or replace, all should be considered as belonging to protection domain of the present utility model.

Claims

1, LED-backlit LCD MODULE comprises: liquid crystal panel, LED-backlit, drive circuit board, module frame and flexible PCB; Described LED-backlit is arranged between liquid crystal panel and the drive circuit board, and LED-backlit and liquid crystal panel are close to; Described liquid crystal panel is connected with drive circuit board by the described flexible PCB that is arranged at a side; Described module frame is closed in the other parts of LED-backlit LCD MODULE in it, and on corresponding liquid crystal panel the position of viewing area hollow out so that the liquid crystal panel content displayed as seen, it is characterized in that, described LED-backlit LCD MODULE also comprises the flat conductive structure that is arranged between LED-backlit and the drive circuit board and is close to LED-backlit, and the in-plane coefficient of heat conductivity of described conductive structure is big and the thickness direction coefficient of heat conductivity is little.

2, LED-backlit LCD MODULE as claimed in claim 1 is characterized in that, described LED-backlit comprises led light source group, light guide plate and framework backlight; Described framework backlight is the concave frame structure, has the bottom and reaches the sidewall that extends upward formation from bottom margin; Described light guide plate is contained in the framework backlight, and its upper surface is close to described liquid crystal panel; Described led light source group also is arranged in the framework backlight, and between light guide plate and described sidewall and near sidewall.

3, LED-backlit LCD MODULE as claimed in claim 2 is characterized in that, described led light source group comprises led circuit plate and LED wick; Described LED wick is arranged on a side of led circuit plate, and the opposite side of led circuit plate is close to the sidewall of described framework backlight; Described drive circuit board is connected with the led circuit plate.

4, LED-backlit LCD MODULE as claimed in claim 3 is characterized in that, described led circuit plate comprises aluminum substrate, and is filled with heat-conducting glue between the sidewall of led circuit plate and described framework backlight.

5, LED-backlit LCD MODULE as claimed in claim 2 is characterized in that, described led light source group has two groups, and is symmetricly set on the two ends of described light guide plate.

As any described LED-backlit LCD MODULE in the claim 2 to 5, it is characterized in that 6, described conductive structure extends to led light source group below at least.