CN1873495A

CN1873495A - LCD with function of preventing light leak, and backlight module

Info

Publication number: CN1873495A
Application number: CN 200510073228
Authority: CN
Inventors: 张豫修; 刘子谊
Original assignee: AU Optronics Corp
Current assignee: AU Optronics Corp
Priority date: 2005-06-01
Filing date: 2005-06-01
Publication date: 2006-12-06
Anticipated expiration: 2025-06-01
Also published as: CN100454103C

Abstract

The invention relates to a liquid crystal display with light leak proof function and the backlight module. The display includes a light guiding board, a light resource and a frame. The light resource is set at the side of the light guiding board, and the frame is set outside the light guiding board. The inner margin of the frame is set to avoid light leak that could avoid light leaking to outside from the brim of the display.

Description

Tool prevents the LCD and the backlight module thereof of light leak function

Technical field

The present invention relates to a kind of LCD, particularly a kind of framework tool of its backlight module prevents the LCD of light leak function.

Background technology

In every image display technique,, be used in widely in the various devices because that LCD has is in light weight, volume is little, power consumption is low, advantage such as radiationless.

Figure 1 shows that the principle of work synoptic diagram of LCD, it mainly is made up of a backlight module 10 and a liquid crystal panel 11, only shows wherein main element at this.

Backlight module 10 comprises a light guide plate 101, a fluorescent tube 102 and a framework 103, and fluorescent tube 102 is located at an end of light guide plate 101, is installed in the framework 103.After the light that fluorescent tube 102 provides enters light guide plate 101, disperse again by the diffusion pilot of light guide plate 101 and to inject in the liquid crystal panel 11 show image.

And liquid crystal panel 11 mainly comprises: a upper substrate 111, an infrabasal plate 112 and a liquid crystal layer 113.Upper substrate 111 surfaces are provided with the zone of filtering again, have been coated with the photoresist of red, green, blue (R, G, B) three looks, make upper substrate 111 have the filter effect of light.

As shown in Figure 2, when the light that fluorescent tube 102 produces when activating is radiated at framework 103 inner wall surface through light guide plate 101, be subjected to the influence on framework 103 surfaces easily and scattering or refraction take place, cause light to escape into the external world from the edge of liquid crystal panel 11, cause light leakage phenomena, the display quality of image image, particularly when the fringe region of image all must be with complete black demonstration, the problem of light leak can be more obvious.

In order to reduce aforesaid light leak problem, generally speaking, in the LCD, can be provided with the frame 1111 of a rectangle on the surface of upper substrate 111, as shown in Figure 2, can be by the shield of frame 1111, prevent the chance of light, shown in Fig. 2 opticpath A to extraneous escape.

Yet, since upper substrate 111 and infrabasal plate 112 both when involution, both respective edges all are coated with sealing, therefore, upper substrate 111 surfaces are when forming frame 1111, the periphery of frame certainly will be reserved with certain space, for the usefulness of involution.And the area of infrabasal plate 112 can be slightly larger than upper substrate 111, so that in infrabasal plate 112 surperficial headspace configuration circuit wirings.

For these reasons, the width of lighttight frame 1111 can't extend to liquid crystal panel 11 outermost edges, and what make that light still can not be subjected to shield by the edge of liquid crystal panel 11 locates to spill (shown in Fig. 2 opticpath B); In other words, if increase the effect of shield light by the width that increases frame 1111, certainly will need to increase the size of upper substrate 111 and infrabasal plate 112, still, increase LCD housing size does not also meet now for the light and handy requirement of LCD.Simultaneously, this kind mode will more increase the zone of light-proof material coating, increases the cost of manufactured materials.

In the prior art, also can reach the purpose that prevents light leak by attaching shading rubber belt at liquid crystal panel.

Be depicted as the synoptic diagram that a liquid crystal panel is pasted shading rubber belt as 3A.And Fig. 3 B is depicted as the sectional view that the liquid crystal panel shown in Fig. 3 A is used for a LCD.As shown in the figure, the surface, four limits of infrabasal plate 112 is pasted with shading rubber belt 12, in order to block the light to extraneous escape.

Yet in reality is made, need be by manually shading rubber belt 12 being attached at liquid crystal panel.And crooked situation takes place to attach in shading rubber belt 12 location inconvenience easily.In addition, also need to drop into additional workhours by the artificial luminous edge that attaches.Not only efficient is low, slows down speed of production, has also increased manufacturing cost.In addition, in subsequent technique, when every fiduciary level of testing liquid crystal display, easy deformation warpage and attach to light guide plate 101 surfaces often after shading rubber belt 12 is heated influences the yield of the optical characteristics and the product output of product.

Therefore, need to adopt a kind of new technology, when preventing LCD edge generation light leak, reduce manufacturing cost, promote the speed of production and the quality of product.

Summary of the invention

For this reason, the invention provides a kind of LCD, wherein backlight module has the function that prevents light leak, and can effectively reduce manufacturing cost, promotes the speed of production of evening out.This backlight module comprises: a light guide plate, a light source and a framework.

Light source is arranged at a side of light guide plate, as side or bottom side, launches light in the light guide plate.

Framework, in order to carrying light guide plate and light source, wherein, the inner edge of framework has more a structure that can prevent light leak.

LCD of the present invention can be passed through the said frame structure, directly reaches the purpose that prevents the light escape.Not only can significantly save outside the human cost of pasting shading rubber belt, also can reduce the required number of assembling steps of technology, increase production efficiency, in the prior art of more can forgoing because of paste the defective that shading rubber belt may bring (for example shading rubber belt paste the position crooked, paste process application of force inequality, or shading rubber belt temperature distortion in subsequent technique).

Description of drawings

Fig. 1 is the principle of work synoptic diagram of a LCD in the prior art;

Fig. 2 is the sectional view of an existing LCD;

Fig. 3 A is the synoptic diagram that a liquid crystal panel is pasted shading rubber belt;

Fig. 3 B is used for the cross-sectional schematic of a LCD for the liquid crystal panel shown in Fig. 3 A;

Fig. 4 is the cross-sectional schematic of one embodiment of the invention;

Fig. 5 is the cross-sectional schematic of another embodiment of the present invention;

Fig. 6 is the cross-sectional schematic of further embodiment of this invention;

Fig. 7 is the cross-sectional schematic of yet another embodiment of the invention.

The main element symbol description

LCD 2 infrabasal plates 112 backlight modules 10

Liquid crystal layer 113 liquid crystal panels 11 upper substrates 211

Shading rubber belt 12 infrabasal plates 212 liquid crystal panels 21

Light guide plate 221 backlight modules 22 light sources 222

Light-shielding structure 24 frameworks 223 oblique sections 25

Frame 1111 coarse planes 26 frames 2111

Light guide plate 101 display surface A1 fluorescent tubes 102

Non-display surface A2 framework 103 opticpath A

Upper substrate 111 opticpath B

Embodiment

Figure 4 shows that the cross-sectional schematic of an embodiment of LCD of the present invention.LCD 2 comprises: a liquid crystal panel 21 and a backlight module 22.

Liquid crystal panel 21 has upper substrate 211 and infrabasal plate 212.The show image according to whether, the upper and lower surface of liquid crystal panel is divided into a display surface A1 and a non-display surface A2.The user watches image by display surface A1, obtains information needed.And,, be provided with a lighttight frame 2111 on upper substrate 211 surfaces of liquid crystal panel 21.

Backlight module 22 comprises again: a light guide plate 221, a light source 222 and a framework 223.

Light guide plate 221 is arranged at the non-display surface side of liquid crystal panel 21, that is, and and with non-display surface A2 the same side of liquid crystal panel 21, the below of infrabasal plate 212.Can increase on the light guide plate and establish various optical thin film, so that uniform light to be provided, after the non-display surface A2 of liquid crystal panel injects, in display surface A1 imaging.

Light source 222 is arranged at a side of light guide plate, for example: in the side or the bottom side of light guide plate 221.The light that light source 222 is sent penetrates by light guide plate 221.

Framework 223 is used to hold light guide plate 221 and light source 222.In the present embodiment, framework 223 is the hollow box of rectangle.Certainly, in other embodiments, framework 223 also can be the rectangle framework of hollow, and ring set is arranged at the periphery of light guide plate 221.

Further, the inner edge of framework 223 such as stepped rising gradually can utilize the stratum of inner edge to locate bearing liquid crystal display panel 21.

And in one embodiment of this invention, the inner edge of framework 223 has a light-shielding structure 24, is positioned at the non-display surface side of display panels, in order to prevent that light is to extraneous escape.Under preferable situation, light-shielding structure 24 is integrally formed with framework, is the extended flange of framework 223 inner edge sidewalls, and light-shielding structure 24 more can with the subregion of light guide plate 221 light outgoing planes, the position is overlapping up and down.Certainly, liquid crystal panel 21 also can be positioned on this flange.

Utilize this flange to block the light of advancing of light guide plate 221, reach the purpose that prevents the light escape to liquid crystal panel 21 edges.

Figure 5 shows that the cross-sectional schematic of another embodiment of the present invention.The difference of Fig. 5 and Fig. 4 is: in the present embodiment, the stratum turning point of the inner edge of framework 223 has a light guide structure, in the present embodiment, light guide structure is an oblique section 25, as shown in Figure 5, when light guide plate 221 is reflected, be directed to the frame 2111 of liquid crystal panel 21, and unlikely escape is to extraneous when the light of other scattering is incident to oblique section 25 surperficial.And be to strengthen light guide effect, light guide structure is not limited to oblique section 25, is protection scope of the present invention any design of light reflection all can being belonged to, and for example is a plane, also can be the curved surface of an indent.

And it should be noted that the light guide structure that is positioned at framework 223 inner edges is not limited in aforesaid embodiment.

Figure 6 shows that the cross-sectional schematic of further embodiment of this invention.Fig. 6 and difference shown in Figure 4 are: in the present embodiment, the light guide structure of framework 223 inner edges will be right against the stair-stepping inner edge of the framework 223 at liquid crystal panel 21 places, and behind the roughening, making light guide structure is a rough surface 26 in addition.As shown in Figure 6, when light guide plate 221 when the light of liquid crystal panel 21 edge scatter is incident upon this light guide structure, the influence that light is subjected to rough surface 26 produces scattered reflection, and light is advanced to unspecified directions, be difficult for escape to extraneous, and have the effect that prevents light leak.

In addition, in order to reach the better effect that prevents light leak, all right painting black coating in light guide structure surface in the various embodiments described above or light-shielding structure surface or light absorbent increase its surperficial light-absorbing ability, reduce the brightness after light reflects.

Even Fig. 4 can be combined with Fig. 6, be illustrated in figure 7 as the synoptic diagram of yet another embodiment of the invention.Wherein, framework 223 has light-shielding structure 24, and the upper surface of light-shielding structure 24 is the light guide structure 26 with coarse plane, has two kinds effect simultaneously.

By above embodiment as can be known, the present invention only need use easy modular design when making framework, can make the inner edge of each framework all have required structure, improves the light leak problem in the LCD.With paste shading rubber belt in the prior art and compare in the method for putting of liquid crystal panel, the present invention can significantly save outside the human cost of pasting shading rubber belt, also can reduce the required number of assembling steps of technology, save built-up time and increase production efficiency, the prior art kind of also can forgoing is because of pasting the defective that shading rubber belt may bring.

Those skilled in the art can be well understood to the utilization of spirit of the present invention and the every advantage that has or function by after reading instructions of the present invention and each embodiment.And above preferable enforcement only is used to describe in detail implementation process of the present invention, and it is not that the suitable modification of being made according to the present invention does not still break away from spirit of the present invention and protection domain in order to restriction protection scope of the present invention.

Claims

1. a LCD is characterized in that, comprising:

One liquid crystal panel, described liquid crystal panel has a upper substrate, an infrabasal plate, a light guide plate; Described light guide plate is arranged at the below of described liquid crystal panel infrabasal plate;

One light source is arranged at a side of described light guide plate, and light is penetrated by described light guide plate; And

One framework is arranged at the described light guide plate outside, and has the described liquid crystal panel of stair-stepping inner rim supports; And the inner edge of described framework also has a light guide structure, and described light guide structure is positioned at the infrabasal plate below of described liquid crystal panel, refracts to the light of described light guide structure in order to guiding, prevents that light is to the edge escape of described liquid crystal panel.

2. LCD as claimed in claim 1 is characterized in that described light guide structure has rough surface.

3. LCD as claimed in claim 1 is characterized in that, described light guide structure is an oblique section.

4. LCD as claimed in claim 1 is characterized in that, described light guide structure is a curved surface.

5. as claim 1 or 2 or 3 or 4 described LCD, it is characterized in that the surface of described light guide structure is a black.

6. a LCD is characterized in that, comprising:

One liquid crystal panel, described liquid crystal panel have a display surface and a non-display surface, and described display surface is used for show image to be watched for the user;

One light guide plate is arranged at the non-display surface side of described liquid crystal panel;

One framework is arranged at the described light guide plate outside, and has the described liquid crystal panel of stair-stepping inner rim supports; And the inner edge of described framework also has a light-shielding structure, and described light-shielding structure is positioned at the infrabasal plate below of described display panels, in order to block the light of described light guide plate to the edge escape of described liquid crystal panel.

7. LCD as claimed in claim 6 is characterized in that, described light-shielding structure extends from the inner edge sidewall of described framework, the subregion of described light-shielding structure and described backlight module light outgoing plane, location overlap.

8. as claim 6 or 7 described LCD, it is characterized in that the surface of described light-shielding structure is a black.

9. a backlight module is characterized in that, comprises:

One light guide plate;

One framework, be arranged at the described light guide plate outside, and the inner edge of described framework also has a light-shielding structure, described light-shielding structure is positioned at the infrabasal plate below of a display panels, in order to block the light of described light guide plate to the edge escape of described liquid crystal panel.

10. backlight module as claimed in claim 9 is characterized in that, described light-shielding structure extends from the inner edge sidewall of described framework, the subregion of described light-shielding structure and described backlight module light outgoing plane, location overlap.

11., it is characterized in that the surface of described light-shielding structure is a black as claim 9 or 10 described backlight modules.