CN1971315A - Backlight module and diffusion board structure used thereby - Google Patents

Abstract

Translated fromChinese

本发明公开了一种背光模块及所使用的扩散板结构。背光模块主要包含具有发光源的光源模块及设于光源模块上方的扩散板结构。扩散板结构包含板体、数个散光微结构区及数个聚光微结构区。散光微结构区及聚光微结构区间隔排列的设置于板体的出光面或入光面上。散光微结构区包含数个弧面透光微结构，每一弧面透光微结构具有圆弧凸面。聚光微结构区较佳包含数个凸棱镜微结构。凸棱镜微结构具有二对应的侧表面，且此二侧表面间具有一夹角θ。

The invention discloses a backlight module and the used diffuser plate structure. The backlight module mainly includes a light source module with a light source and a diffusion plate structure arranged above the light source module. The diffusion plate structure includes a plate body, several light-scattering microstructure areas and several light-concentrating microstructure areas. The light-scattering microstructure area and the light-gathering microstructure area are arranged at intervals on the light-emitting surface or the light-incoming surface of the plate body. The astigmatism microstructure area includes several arcuate light-transmitting microstructures, and each arcuate light-transmitting microstructure has an arcuate convex surface. The light concentrating microstructure area preferably includes several convex prism microstructures. The convex prism microstructure has two corresponding side surfaces, and there is an included angle θ between the two side surfaces.

Description

Backlight module and employed diffusion board structure

Technical field

The present invention relates to a kind of backlight module and employed diffusion board structure thereof, particularly relate to backlight module and employed diffusion board structure thereof that a kind of feed flow crystal device uses.

Background technology

Backlight module is widely used in liquid crystal indicator, computer keyboard, mobile phone button, billboard and other needs on the device of light source, to provide this type of device required planar light source.Particularly the market demand of liquid crystal indicator is significantly grown up in recent years, and for the fluid,matching crystal device reaches apparent requirement on function, the employed backlight module design of liquid crystal indicator also becomes more diversified.

Yet when backlight module was applied to display panels, the homogeneity of its output light was often for influencing the key factor of display panels overall performance.Particularly along with the increase day by day of display panels size, the fluorescent tube setting of straight-down negative also becomes the trend of present technical development in the backlight module.How the light source that fluorescent tube sent with several spacing parallel arrangings evenly spreads, and avoids forming the local bright or dark excessively situation of crossing, and becomes the important topic in the display panels design.

Figure 1 shows that known backlight module reaches the structure in order to diffused light source.As shown in Figure 1,backlight module 10 comprises thefluorescent tube 13 and thereflector plate 15 of several spacing parallel arrangings.Fluorescent tube 13 tops are provided withdiffuser plate 37 in regular turn,diffusion sheet 35,brightness enhancement film 31 reach and go up diffusion sheet orreflection blast sheet 33 down.Light enters theliquid crystal panel 50 that is arranged at diffusion sheet orreflection blast sheet 33 tops throughdiffuser plate 37, followingdiffusion sheet 35,brightness enhancement film 31 and after going up diffusion sheet or reflecting the diffusion process ofblast sheet 33.

In known technology, the penetrance ofdiffuser plate 37,time diffusion sheet 35 andlast diffusion sheet 33 is low more, and its diffusion effect is good more.But whendiffuser plate 37, followingdiffusion sheet 35 and go up the penetrance ofdiffusion sheet 33 when low more, the service efficiency of back light also just reduces relatively.Therefore the suitable necessary output power that promotes power supply causes the situation of power consumption to produce to increase the brightness of fluorescent tube 13.In addition, also there is partial design descending the microstructure that single form is set on thediffusion sheet 35, to change the direct of travel of light, to reach the effect of diffusion light.But because the direction of light when arriving at downdiffusion sheet 35 and inconsistent, so the diffusion effect that uses the microstructure of single form to reach is very limited.

Summary of the invention

The object of the present invention is to provide a kind of backlight module, have preferable light uniformity coefficient, and the too much brightness of avoidable loss.

The object of the present invention is to provide a kind of diffusion board structure, preferable light diffusion effect can be provided.

To achieve these goals, the invention provides a kind of backlight module, mainly comprise light source module and diffusion board structure with light emitting source.Diffusion board structure is arranged at the light source module top.Diffusion board structure comprises plate body, several astigmatic microstructures districts and several optically focused microstructured area.Plate body mainly comprises incidence surface and exiting surface, and wherein incidence surface is in the face of light source module.Astigmatic microstructures district and optically focused microstructured area be spaced to be arranged on the exiting surface or incidence surface of plate body.Preferable position, astigmatic microstructures district wherein corresponding to light emitting source, and the optically focused microstructured area is preferable corresponding to the interstitial site between adjacent light emitting source.

The astigmatic microstructures district comprises several cambered surface printing opacity microstructures, and each cambered surface printing opacity microstructure then has arc convex surface.Preferable several convex prism microstructures that comprises of optically focused microstructured area.The convex prism microstructure has the side surface of two correspondences, and has an angle theta between this two side surface.This angle theta is preferable can be adjusted with the interval width of light emitting source and apart from the distance of plate body.

After the light that light source module produces was injected plate body, the cambered surface printing opacity microstructure that is positioned at the light emitting source top was by the geometrical construction of arc convex surface and the difference of refractive index, and the light refraction that incident angle is less is to the top, interval of adjacent light emitting source; Be positioned at then that incident angle is the bigger light refraction of the convex prism microstructure of interval top of adjacent light emitting source to be retained in the top of optically focused microstructured area.By the cooperation of astigmatic microstructures district and optically focused microstructured area, the equalizing light rays of light emitting source top will be concentrated on.

Describe the present invention below in conjunction with the drawings and specific embodiments, but not as a limitation of the invention.

Description of drawings

Fig. 1 is the synoptic diagram of known backlit module and display panels;

Fig. 2 is the assembly explosive view of liquid crystal indicator embodiment of the present invention;

Fig. 3 is the assembly explosive view of backlight module embodiment of the present invention;

Fig. 4 is the sectional view of backlight module embodiment of the present invention;

Fig. 5 is the sectional view of another embodiment of backlight module;

Fig. 6 is another embodiment synoptic diagram of convex prism microstructure;

Fig. 7 is the synoptic diagram of optical relation between light source module and diffusion board structure;

Fig. 8 is the sectional view of another embodiment of diffusion board structure;

Fig. 9 is the sectional view of another embodiment of diffusion board structure;

Figure 10 is the assembly explosive view of another embodiment of backlight module.

Wherein, Reference numeral:

110 shell bodies

130 liquid crystal panels

200 backlight modules

300 light source modules

310 light emitting sources

330 reflector plates

500 diffusion board structures

510 plate bodys

511 incidence surfaces

513 exiting surfaces

530 astigmatic microstructures districts

531 cambered surface printing opacity microstructures

533 arc convex surface

550 optically focused microstructured area

551 convex prism microstructures

553 side surfaces

700 blooming pieces

Embodiment

The invention provides a kind of backlight module and employed diffusion board structure thereof.With preferred embodiment, this backlight module feed flow crystal device uses.Yet in different embodiment, this backlight module can need the device of planar light source to use for computer keyboard, mobile phone button, billboard and other.Furthermore, the present invention also comprises the liquid crystal indicator that uses this backlight module.In preferred embodiment, liquid crystal indicator of the present invention comprises a color liquid crystal display arrangement.Yet in different embodiment, liquid crystal indicator of the present invention also can comprise monochromatic liquid crystal indicator.Liquid crystal indicator general reference is used the display device of liquid crystal panel, comprises the LCDs etc. of LCD monitor, mobile phone and digital camera of LCD TV, personal computer and the laptop computer of family expenses.

As shown in Figure 2, liquid crystal indicator mainly comprisesshell body 110,liquid crystal panel 130 and backlight module 200.Liquid crystal panel 130 is arranged on the backlight module 200,110 coveringliquid crystal panel 130 of shell body.The variation that the light thatbacklight module 200 sends produces brightness and color throughliquid crystal panel 130, and then form the image that shows.

As shown in Figures 3 and 4,backlight module 200 mainly compriseslight source module 300 and diffusion board structure 500.Diffusion board structure 500 is arranged atlight source module 300 tops.Light source module 300 is preferable to have severallight emitting sources 310 and reflector plate 330.The light thatlight emitting source 310 sends directly or afterreflector plate 330 reflections enters diffusion board structure 500.In this preferred embodiment,light emitting source 310 comprises fluorescent tube, for example cold cathode ray tube or hot cathode ray tube; But in different embodiment,light emitting source 310 also can comprise light emitting diode or other can produce the assembly of light.

In Fig. 3 and embodiment shown in Figure 4,diffusion board structure 500 comprisesplate body 510, severalastigmatic microstructures districts 530 and several optically focused microstructured area 550.Plate body 510 mainly comprisesincidence surface 511 andexiting surface 513, and whereinincidence surface 511 is in the face of light source module 300.In other words, the light that sends oflight source module 300 entersdiffusion board structure 500 through incidence surface 511.In preferred embodiment,plate body 510 is preferably has light transmission, and its light transmittance is preferable greater than 75%.The material ofplate body 510 can comprise polycarbonate (PC), poly-stupid ethene (PS), cycloolefin macromolecule (COP) or other similar material.In addition, theplate body 510 alternative particles that add are to increase the light diffusion effect.

Severalastigmatic microstructures districts 530 and optically focusedmicrostructured area 550 are arranged at theexiting surface 513 or theincidence surface 511 of plate body 510.In embodiment as shown in Figure 4,astigmatic microstructures district 530 and optically focusedmicrostructured area 550 are arranged on theexiting surface 513; As shown in Figure 5,550 ofastigmatic microstructures district 530 and optically focused microstructured area can be arranged on theincidence surface 511 but in another embodiment.In addition,astigmatic microstructures district 530 and optically focusedmicrostructured area 550 also can be arranged on exitingsurface 513 and theincidence surface 511 simultaneously.

In addition,astigmatic microstructures district 530 and optically focusedmicrostructured area 550 are preferably and are spaced, as shown in Figure 4; In other words, 550 adjacent of two optically focused microstructured area are provided with an astigmatic microstructures district 530.Eachastigmatic microstructures district 530 just is arranged at the top oflight emitting source 310 corresponding to the position oflight emitting source 310; 550 interstitial sites corresponding to 310 of adjacent light emitting sources of each optically focused microstructured area just are arranged at the top in the gap of 310 of light emitting sources.But in the embodiment shown in fig. 5, the position that is provided with ofastigmatic microstructures district 530 and optically focusedmicrostructured area 550 is exchanged, just eachastigmatic microstructures district 530 is corresponding to the interstitial site of 310 of adjacent light emitting sources, and each optically focusedmicrostructured area 550 is corresponding to the position oflight emitting source 310.

In the embodiment shown in fig. 4, on the cross section of crosscutastigmatic microstructures district 530 and optically focusedmicrostructured area 550, the dispersion of distribution inastigmatic microstructures district 530 approximates the dispersion of distribution of optically focused microstructured area 550.But in different embodiment, be pattern or the distribution situation of considering differentlight emitting source 310, can with the dispersion of distribution inastigmatic microstructures district 530 and optically focused microstructured area 55 the dispersion of distribution adjust.In general, the ratio ofastigmatic microstructures district 530 dispersions of distribution and optically focusedmicrostructured area 550 dispersions of distribution is preferable between 3 and 0.33.In addition, between preferable between 310 distances of adjacent two light emitting sources 0.25 times to 0.75 times of the dispersion of distribution in astigmatic microstructures district 530.As shown in Figure 4, when 310 distances of adjacent two light emitting sources were d, the dispersion of distribution inastigmatic microstructures district 530 was preferable between 0.25d and 0.75d.

Astigmatic microstructures district 530 comprises several first geometries.In embodiment as shown in Figures 3 and 4, first geometry is a cambered surfaceprinting opacity microstructure 531, and each cambered surfaceprinting opacity microstructure 531 has arc convex surface 533.In preferred embodiment, the width of each cambered surfaceprinting opacity microstructure 531 is between 40 μ m to 120 μ m, highly then between 20 μ m to 30 μ m.In Fig. 3 and embodiment shown in Figure 4, cambered surfaceprinting opacity microstructure 531 is preferably the semicylinder that extends alongplate body 510, andarc convex surface 533 is positioned at the side of semicylinder.In addition, when the light emitting source in thelight source module 300 310 was fluorescent tube, the preferable direction along parallel fluorescent tube of semicylinder was extended.

Optically focusedmicrostructured area 550 preferable several second geometries that comprise.In embodiment as shown in Figure 4, second geometry is a convex prism microstructure 551.As shown in Figure 4,convex prism microstructure 551 has theside surface 553 of two correspondences, and 553 of this two side surfaces have an angle theta.This angle theta is preferable can be adjusted with the interval width oflight emitting source 310 and apart from the distance of plate body 510.In preferred embodiment, angle theta can zygonema angle of cut θ atplate body 510 between adjacent two light emitting sources₁0.85 times to 1.15 times between.In addition, the preferable width of eachconvex prism microstructure 551 is between 40 μ m to 120 μ m, and is highly then preferable between 20 μ m to 30 μ m.In Fig. 3 and embodiment shown in Figure 4, convexprism microstructure 551 is the triangulo column that extends alongplate body 510; But in the embodiment shown in fig. 6,convex prism microstructure 551 also can be along the trapezoidal cylinder prism structure ofplate body 510 extensions or the structure of other polygon cylinder.In addition, when the light emitting source in thelight source module 300 310 was fluorescent tube, the preferable direction along parallel fluorescent tube of polygon cylinder was extended.

As shown in Figure 7, the light thatlight source module 300 is produced abovelight emitting source 310 has less drift angle with respect to normal more, and the light that is produced above the interval of adjacentlight emitting source 310 then has bigger drift angle more.Thereforelight source module 300 also is better than the brightness above the interval of adjacentlight emitting source 310 at the backlight illumination that is produced above the light emitting source 310.After the light thatlight source module 300 produces is injectedplate body 510, first geometry that is positioned atlight emitting source 310 tops be cambered surfaceprinting opacity microstructure 531 by the geometrical construction of arcconvex surface 533 and the difference of refractive index, the light refraction that incident angle is less is to top, the interval of adjacentlight emitting source 310; Second geometry that is positioned at the top, interval of adjacentlight emitting source 310 is that then that incident angle is the bigger light refraction of convexprism microstructure 551 is to be retained in the top of optically focused microstructured area 550.By the cooperation ofastigmatic microstructures district 530 and optically focusedmicrostructured area 550, the equalizing light rays oflight emitting source 310 tops will be concentrated on.

Figure 8 shows that another embodiment ofastigmatic microstructures district 530 and optically focused microstructured area 550.In this embodiment, in sameastigmatic microstructures district 530, first geometry in the middle of being positioned at is that cambered surfaceprinting opacity microstructure 531 width are cambered surfaceprinting opacity microstructure 531 width greater than first geometry that is positioned at both sides.In other words, be the width that cambered surfaceprinting opacity microstructure 531 has broad than first geometry near light emitting source 310.By the adjustment of this width,astigmatic microstructures district 530 can produce light dispersion effect preferably.In addition, in sameastigmatic microstructures district 530, the cambered surfaceprinting opacity microstructure 531 in the middle of being positioned at hasarc convex surface 533 curvature littler than the cambered surfaceprinting opacity microstructure 531 that is positioned at both sides.The adjustment of this curvature is corresponding to the angular distribution oflight emitting source 310 incident raies, and then produces light dispersion effect preferably.

As shown in Figure 8, in same optically focusedmicrostructured area 550, theconvex prism structure 551 in the middle of being positioned at has less two side surfaces, 553 angle theta than theconvex prism structure 551 that is positioned at both sides.In other words, have less two side surfaces, 553 angle theta fromlight emitting source 310convex prism structures 551 far away.By the adjustment of this angle, optically focusedmicrostructured area 550 can produce light localization effects preferably.In addition, in this embodiment, angle theta can zygonema angle of cut θ between the adjacent twoluminous plate bodys 510 that come from₁0.5 times to 1.5 times between.

Figure 9 shows that another embodiment ofastigmatic microstructures district 530 and optically focused microstructured area 550.In this embodiment, the light emitting source in thelight source module 300 310 is the pointolite as luminescence components such as light emitting diodes.This moment,astigmatic microstructures district 530 was spaced respectively on two dimensions of quadrature of plate body respectively with optically focusedmicrostructured area 550 is preferable, and then formed the arrangement mode of approximate matrix.In addition, form that the cambered surfaceprinting opacity microstructure 531 inastigmatic microstructures district 530 is preferable to be formed by the hemisphere structure; Theconvex prism microstructure 551 of forming optically focusedmicrostructured area 550 is then formed by angle vertebra structure prism.

In preferred embodiment,astigmatic microstructures district 530 and optically focusedmicrostructured area 550 directly are formed on the surface ofplate body 510 when makingplate body 510 in the mode of mould ejection formation.But in different embodiment,astigmatic microstructures district 530 and optically focusedmicrostructured area 550 also can the rolling forming mode be processed to form on the surface of plate body 510.In addition,astigmatic microstructures district 530 and optically focusedmicrostructured area 550 also can attach or alternate manner is formed on theplate body 510.

As shown in figure 10,backlight module 200 also alternative comprise at least one blooming piece 700.Blooming piece 700 described herein comprises brightness enhancement film and light polarizing film etc., and the preferable top that is arranged at diffusion board structure 500.In different embodiment,backlight module 200 is also alternative to increase diffusion sheet in the top ofdiffusion board structure 500, to reach better light diffusion effect.

Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection domain of the appended claim of the present invention.

Claims (23)

1, a kind of diffusion board structure for being used with a light source module, is characterized in that this diffusion board structure comprises:

One plate body has an incidence surface and an exiting surface;

Several astigmatic microstructures districts, be arranged at this incidence surface of this plate body and this exiting surface one of them, each astigmatic microstructures district comprises several first geometries; And

Several optically focused microstructured area, be arranged at this incidence surface of this plate body and this exiting surface one of them, each optically focused microstructured area comprises several second geometries, wherein these several optically focused microstructured area and this several astigmatic microstructures intervals are every arrangement.

2, diffusion board structure according to claim 1 is characterized in that, this first geometry comprises a cambered surface printing opacity microstructure, and this cambered surface printing opacity microstructure has an arc convex surface; This second geometry comprises a convex prism microstructure.

3, diffusion board structure according to claim 1 is characterized in that, this cambered surface printing opacity microstructure comprises a semicylinder that extends along this plate body, and this arc convex surface is positioned at the side of this semicylinder.

4, diffusion board structure according to claim 1 is characterized in that, this convex prism microstructure comprises a polygon cylinder that extends along this plate body, and this arc convex surface is positioned at the side of this polygon cylinder.

5, diffusion board structure according to claim 4 is characterized in that, this polygon cylinder comprises a triangulo column.

6, diffusion board structure according to claim 1 is characterized in that, in same astigmatic microstructures district, the width of this first geometry in the middle of being positioned at is greater than the width of this first geometry that is positioned at both sides.

7, diffusion board structure according to claim 2 is characterized in that, in same astigmatic microstructures district, this arc convex surface curvature of this cambered surface printing opacity microstructure in the middle of being positioned at is less than this arc convex surface curvature of this cambered surface printing opacity microstructure that is positioned at both sides.

8, diffusion board structure according to claim 2, it is characterized in that, this convex prism microstructure has two side surfaces, and wherein in same optically focused microstructured area, this two side surfaces angle of this convex prism structure in the middle of being positioned at is less than this two side surfaces angle of this convex prism structure that is positioned at both sides.

9, diffusion board structure according to claim 2, it is characterized in that, on a cross section of this astigmatic microstructures district of crosscut and this optically focused microstructured area, the dispersion of distribution in this astigmatic microstructures district with respect to the dispersion of distribution ratio of this optically focused microstructured area between 3 and 0.33.

10, diffusion board structure according to claim 9 is characterized in that, the dispersion of distribution in this astigmatic microstructures district is identical with the dispersion of distribution of this optically focused microstructured area.

11, diffusion board structure according to claim 2 is characterized in that, the width of each this cambered surface printing opacity microstructure is between 40 μ m to 120 μ m.

12, diffusion board structure according to claim 2 is characterized in that, the height of each this cambered surface printing opacity microstructure is between 20 μ m to 30 μ m.

13, diffusion board structure according to claim 2 is characterized in that, the width of each this convex prism microstructure is between 40 μ m to 120 μ m.

14, diffusion board structure according to claim 2 is characterized in that, the height of each this convex prism microstructure is between 20 μ m to 30 μ m.

15, diffusion board structure according to claim 2 is characterized in that, the penetrance of this plate body is greater than 75%.

16, a kind of backlight module is characterized in that, comprises:

One light source module has several light emitting sources; And

Diffusion board structure is arranged on this light source module, and this diffusion board structure comprises: a plate body, have an incidence surface and an exiting surface, and wherein this incidence surface is corresponding to this light source module; Several astigmatic microstructures districts, be arranged at this incidence surface of this plate body and this exiting surface one of them, each astigmatic microstructures district comprises several first geometries, wherein the setting in each this astigmatic microstructures district is corresponding to the position of each this light emitting source; And several optically focused microstructured area, be arranged at this incidence surface of this plate body and this exiting surface one of them, each optically focused microstructured area comprises several second geometries, wherein these several optically focused microstructured area and this several astigmatic microstructures intervals are every arrangement, and corresponding to the interstitial site between two adjacent light emitting sources.

17, backlight module according to claim 16 is characterized in that, this first geometry comprises a cambered surface printing opacity microstructure, and this cambered surface printing opacity microstructure has an arc convex surface; This second geometry comprises a convex prism microstructure.

18, backlight module according to claim 17 is characterized in that, this cambered surface printing opacity microstructure comprises a semicylinder that extends along this plate body, and this arc convex surface is positioned at the side of this semicylinder.

19, backlight module according to claim 17 is characterized in that, this convex prism microstructure comprises a polygon cylinder that extends along this plate body, and this arc convex surface is positioned at the side of this polygon cylinder.

20, backlight module according to claim 19 is characterized in that, this polygon cylinder comprises a triangulo column.

21, backlight module according to claim 16 is characterized in that, in same astigmatic microstructures district, the width of this first geometry in the middle of being positioned at is greater than the width of this first geometry that is positioned at both sides.

22, backlight module according to claim 17 is characterized in that, in same astigmatic microstructures district, this arc convex surface curvature of this cambered surface printing opacity microstructure in the middle of being positioned at is less than this arc convex surface curvature of this cambered surface printing opacity microstructure that is positioned at both sides.

23, backlight module according to claim 17, it is characterized in that, this convex prism microstructure has two side surfaces, and wherein in same optically focused microstructured area, this two side surfaces angle of this convex prism structure in the middle of being positioned at is less than this two side surfaces angle of this convex prism structure that is positioned at both sides.

Images