CN102767786A - Diffusion plate with dot-matrix diffusion structures and backlight module utilizing same - Google Patents
Diffusion plate with dot-matrix diffusion structures and backlight module utilizing same Download PDFInfo
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- CN102767786A CN102767786A CN2012102570250A CN201210257025A CN102767786A CN 102767786 A CN102767786 A CN 102767786A CN 2012102570250 A CN2012102570250 A CN 2012102570250A CN 201210257025 A CN201210257025 A CN 201210257025A CN 102767786 A CN102767786 A CN 102767786A
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Abstract
The invention discloses a diffusion plate with dot-matrix diffusion structures. The dot-matrix diffusion structures are arranged on an out-light surface or an in-light surface of the diffusion plate, and centers of the diffusion structures correspond to light source centers of backlight sources one by one. The diffusion structures include two structures: the first structure includes that the center area of the first diffusion structure is a circular disc, hollow spots arranged in concentric circles are arranged on the circular disc, solid spots arranged in concentric circles are arranged outside the central area, and the first diffusion structure is coated on the solid spots and positions around the hollow spots on the circular disc; the second structure includes that circular rings arranged in concentric circles are distributed in the central area of the second diffusion structure, solid spots arranged in concentric circles are arranged outside the central area, and the second diffusion structure is coated on the circular rings and the solid spot areas. Intensities of diffusion structures on all circles of the first and the second structures become smaller and smaller from the center to the outside.
Description
Technical field
The present invention relates to the diffuser plate in a kind of module backlight, the diffuser plate in particularly a kind of module backlight that is applied to adopt the dot matrix backlight with dot matrix diffusion structure.
Background technology
At present, the liquid crystal module of flat-panel screens application adopts the TFT-LCD technology more.TFT-LCD is the luminous demonstration of inactive mode, by white light module backlight (Backlight Module) uniform system brightness is provided usually, sees through colored filter (Color Filter) again and obtains the abundant colors demonstration.
Existing white light down straight aphototropism mode set comprises light source and optical diaphragm group.Light emitting diode (LED) therefore becomes one of light source of LCD backlight module because volume is little, power consumption is few.The light source of light emitting diode (LED) is lambertian distribution, and its distribution curve flux is characterized as by angle cosine decays gradually, and the Illumination Distribution of LED on the plane that possesses this characteristic is that bright periphery, LED center is dark; The LED collocation has the secondary optical lens that expands light effect, and can change its distribution curve flux is bat wing, but its Illumination Distribution on the plane still is that bright periphery, center is dark.Being combined in of LED array formula array can be alleviated the bright dark uneven phenomenon that LED light type distributes and causes to a certain extent, but under the enough big situation of light-emitting diodes tube pitch, still has the phenomenon of light illumination skewness.
For guaranteeing that module backlight provides uniform brightness, can adopt increase the blooming piece use amount or on blooming piece the mode of printing micro-structural improve dot matrix LED bright dipping non-uniform phenomenon.In order to overcome aforementioned dot matrix LED bright dipping non-uniform phenomenon, prior art (number of patent application is CN201010002819.3) designs diffusion structure on diffuser plate, its diffusion structure constitute by single pattern and the production realizability low.
Summary of the invention
The object of the present invention is to provide a kind of down straight aphototropism mode set to use the diffuser plate with dot matrix diffusion structure that can improve the backlight outgoing light homogeneity and have higher production exploitativeness with the dot matrix backlight.
For realizing above-mentioned purpose; The present invention adopts following design; Described diffuser plate is provided with the dot matrix diffusion structure; Described diffusion structure center is corresponding one by one with the light source center of backlight, and described diffusion structure comprises two kinds of structures: the central area of structure one is a disk, and described disk is provided with the hollow spot of arranging by donut; The outside of central area is coated with diffusion structure for pressing the solid spot that donut is arranged on the non-hollow speckle regions of wherein solid spot and disk; The central area of structure two is for pressing the annulus that donut is arranged; The outside of central area is for pressing the solid spot that donut is arranged; Wherein annulus and solid speckle regions are coated with diffusion structure, and the diffusion structure density in structure one and the structure two on each annulus outwards is the trend that diminishes gradually by the center.
Diffusion structure density in structure one and the structure two on each annulus is set by following formula:
y＝ax+b
Wherein x is the annulus order, x=1 from inside to outside, 2,3,4....., n; Y is a diffusion structure density, and the span of y is 0-1; A, b are the linear function coefficient, and the span of a is-1-0, and b is the positive number greater than 0.
Diffusion structure density in structure one and the structure two on each annulus can also be set by following formula:
y
j＝a
jx
j+b
j
Y wherein
jLinear function by the m section is different is formed, and each linear function order is represented with j, j=1, and 2 ... m; x
jBe the annulus order, contain n annulus, then x if order is the function of j
jExtremely outside value is followed successively by 1,2,3 internally ... N; y
jBe diffusion structure density, span 0-1; a
j, b
jFor order is the linear function coefficient of j, wherein a
jSpan be-1-1, b
jFor greater than 0 positive number.
The area of the diffusion structure dispensing area on its each annulus of described diffusion structure is set by following formula:
printing_area＝y×total_area＝S
i＝y×π×(D
i 2-D
i-1 2)
Wherein printing_area is the area of diffusion structure dispensing area in this annulus, with symbol S
iExpression; Total_area is the gross area of this annulus; D
iBe the diameter of this annulus cylindrical, D
I-1Be the diameter of a last annulus cylindrical, i=1,2,3,4....., n; Y is a diffusion structure density.
It is big that described diffusion structure density is set to internal density, and outside density is little, and described internal density scope is 0.4-1.0, and outside density range is 0-0.6.
Solid spot of described diffusion structure and hollow spot density can be done regional adjustment, and the shape in corresponding zone comprises circle, ring-type, rectangle, triangle, trapezoidal, fan-shaped, star or polygon.
Solid spot of described diffusion structure and hollow spot shape comprise circle, ring-type, rectangle, triangle, trapezoidal, fan-shaped, star or polygon.
Described diffuser plate light transmittance is between 40% to 80%, and the diffuser plate mist degree is higher than 60%.
Described diffusion structure is formed by the material coating with reflection scattering nature, and its light transmittance of described material is less than 50%.
Described diffusion structure is arranged at the exiting surface or the incidence surface of diffuser plate.
A kind of employing has the module backlight of the diffuser plate of dot matrix diffusion structure, comprises backboard, light-emitting device, diaphragm, and described diffuser plate is arranged between module light-emitting device backlight and the diaphragm, and its light source of described light-emitting device is that dot matrix is arranged.
The present invention adopts above design, is the platelet-like reflective pattern through the zone, design centre, and the outside of central area is the dot matrix diffusion structure of point-like reflection graphic patterns, the more exploitativeness of accords with production; Design according to diffusion structure density; Design diffusion structure spot density is linear or a plurality of linear adjustables and distributes; Through the adjustment of a plurality of linear formula and diffusion structure areal concentration is set, make the density of diffusion structure the different densities value to be set in zones of different, the homogenising that more helps the dot matrix diffusion structure distributes; Can improve module backlight because of the bright dark skewness problem of singularity that other factors such as its mechanism cause, reach the purpose of the even mixed light of module backlight.
Description of drawings
Below in conjunction with the accompanying drawing and the specific embodiment the present invention is done further detailed explanation:
Fig. 1 is diffusion structure one single diffusion structure of the present invention and four diffusion structure dot matrixs sketch map of arranging;
Fig. 2 is diffusion structure two single diffusion structures of the present invention and four diffusion structure dot matrixs sketch map of arranging;
Fig. 3 is the density profile sketch map of single linear function for diffusion structure density of the present invention;
Fig. 4 is the density profile sketch map of 4 linear functions for diffusion structure density of the present invention;
Fig. 5 is the diffusion structure region area account form sketch map of structure two of the present invention;
Fig. 6 is 4 linear function distribution schematic diagrams for diffusion structure density of the present invention;
Fig. 7 is one of them embodiment of diffusion structure variable density mode of the present invention;
Fig. 8 is another embodiment of diffusion structure variable density mode of the present invention;
Fig. 9 is the practical back light module unit structure sketch map of the present invention.
The specific embodiment
In the present embodiment with single matrix diffusion structure and 4 matrix dot configuration diffusion structures; And speckle patterns is a round dot; Describe; Described diffuser plate is applied to adopt the down straight aphototropism mode set of dot matrix backlight, and described diffuser plate is provided with the dot matrix diffusion structure, and described dot matrix diffusion structure center is corresponding one by one with the light source center of backlight.
Described diffusion structure comprises two kinds of structures:
As shown in Figure 1; The central area of structure one is a disk 1; Described disk 1 is provided with the hollow spot of arranging by donut, and the outside of central area is coated with diffusion structure for pressing the solid spot 2 that donut is arranged on the non-hollow speckle regions of wherein solid spot and disk.
As shown in Figure 2, the central area of structure two is for pressing the annulus 3 that donut is arranged, and the outside of central area is for pressing the solid spot 4 that donut is arranged, and wherein annulus 3 is coated with diffusion structure with solid speckle regions.
Diffusion structure density in structure one and the structure two on each annulus can be set according to following formula:
y＝ax+b
Wherein x is the annulus order, x=1 from inside to outside, 2,3,4....., n; Y is a diffusion structure density, and the span of y is 0-1; A, b are the linear function coefficient, and the span of a is-1-0 that b is the positive number greater than 0.
As shown in Figure 3, to formula y=ax+b, a gets-2/45, and the b value is 38/45, obtains linear function y=-2/45+x38/4, and the x value is 1 to 10, draws the diffusion structure density value on 1 to the 10 ring annulus, and wherein the value of y is 0.4-1.0.
Diffusion structure density in structure one and the structure two on each annulus can also be set according to following formula:
y
j＝a
jx
j+b
j
Y wherein
jLinear function by the m section is different is formed, and each linear function order is represented with j, j=1, and 2 ... m; x
jBe the annulus order, contain n annulus if order is the function of j, then xj internally extremely outside value be followed successively by 1,2,3 ... N; y
jBe diffusion structure density, span 0-1; a
j, b
jFor order is the linear function coefficient of j, wherein a
jSpan be-1-1, b is the positive number greater than 0.
As shown in Figure 4, to multistage linear function y
j=a
jx
j+ b
jCan carry out following value, j gets 1,2,3 and 4 and promptly is made up of four sections linear functions, the corresponding x of each section linear function
jValue is 1 to 10, and is specific as follows:
According to as above formula, obtain diffusion structure density profile as shown in Figure 4.
As shown in Figure 5, according to distribution trend shown in Figure 4, be example with diffusion structure one; Its diffusion structure diagram is seen Fig. 5; Corresponding annular region 5 hollow spot sizes diminish, and make the diffusion patterned density of corresponding annulus rise, and ascensional range designs according to ledge shown in the curve of Fig. 4.
As shown in Figure 6, diagram has disclosed the area setting means of the diffusion structure dispensing area on each annulus, and concrete formula is following:
printing_area＝y×total_area＝S
i＝y×π×(D
i 2-D
i-1 2)
Wherein printing_area is the area of diffusion structure dispensing area in this annulus, and Fig. 6 is illustrated as dot matrix diffusion structure dispensing area area in second annulus, for the figure dotted is filled and oblique line part area, with symbol S
iExpression; Total_area is the gross area of this annulus, and promptly schemes bend part area; D
iBe the diameter of this annulus cylindrical, D
I-1Be the diameter of a last annulus cylindrical, i=1,2,3,4....., n; Y is a diffusion structure density.Fig. 6 illustrates according to calculating gained S
iConfirm the coating width of annulus pattern, concrete, according to the difference of diffusion structure coated pattern, the size of coated pattern and quantity account form are done corresponding change.
According to the diffusion structure dispensing area area computing formula of the above, total_area is shaped as an annulus, wherein D
iBe said annulus outside diameter, if each D
iBetween be equal difference relation, then adjacent annulus and annulus are equidistant; If each D
iBe non-equal difference relation, firm adjacent annulus and annulus are non-equidistance.At each D
iUnder the situation about confirming, the region area of diffusion structure coating also can be adjusted, and is specially diffusion structure one and can adjusts with solid spot, the diameter of hollow spot and the inner and outer diameter of annulus in the diffusion structure two.Through adjusting said annulus exradius D
iAnd the size of diffusion structure spot, can realize the control of diffusion structure density y value.
In the diffusion structure actual design process, need to consider that structure should be as far as possible little, avoid causing the shade that can not cover because of diffusion structure is excessive; The physical dimension minimum of a value should be controlled within the actual process feasible region simultaneously.In the uneven illumination characteristic that diffuser plate appears, design the intensity scheme of certain trend, to the dot matrix light source through D
iReach the adjustment of diffusion structure spot size, satisfy the demand of density design load, reach the purpose of improving the bright dark uneven phenomenon of illumination.
Diffusion structure density can be carried out the regionality adjustment; Promptly can come according to different linear functions the density of diffusion structure is adjusted in each zone; The shape in described zone comprises circle, ring-type, rectangle, triangle, trapezoidal, fan-shaped, star or polygon, and the adjustment mode can realize through the change of spot spacing and size.Like Fig. 7 and shown in Figure 8, be that example describes with structure one among the figure, Fig. 7 illustrates the diffusion structure spot density to do the adjustment of sector region property at different axial directions, Fig. 8 illustrates the diffusion structure spot density to do the adjustment of polygonal region property.
Diffusion structure is coated on the diffuser plate among the embodiment, and described diffuser plate light transmittance is between 40% to 80%, and the mist degree of diffuser plate is higher than 60%; Described diffusion structure is formed by the material coating with reflection scattering nature, and this material light transmittance is less than 50%; Said diffusion structure speckle patterns also can be ring-type, rectangle, triangle, trapezoidal, fan-shaped, star or polygon except the described circle of embodiment; Said diffusion structure can be arranged at the exiting surface or the incidence surface of diffuser plate.
As shown in Figure 9; A kind of employing has the module backlight of the diffuser plate of dot matrix diffusion structure; Module backlight is except comprising the diffuser plate 8 with dot matrix diffusion structure; Also comprise backboard 6, light-emitting device 7, diaphragm 9, described light-emitting device 7 its light sources 11 are arranged for dot matrix, and the quantity of diaphragm 9 can increase according to actual needs.Diffusion structure array quantity is according to the size of module backlight and the quantity decision of light source; Generally speaking; The quantity of light source that large-sized more module backlight uses is many more; Light source is array arranges, and is generally rectangular array or staggered equilateral triangle array arrangement, and the distribution of diffusion structure on diffuser plate is corresponding one by one with array of source.
Claims (11)
1. diffuser plate with dot matrix diffusion structure; It is characterized in that: described diffuser plate is provided with the dot matrix diffusion structure; Described diffusion structure center is corresponding one by one with the light source center of backlight; Described diffusion structure comprises two kinds of structures: the central area of structure one is a disk; Described disk is provided with the hollow spot of arranging by donut, and the outside of central area is coated with diffusion structure for pressing the solid spot that donut is arranged on the non-hollow speckle regions of wherein solid spot and disk; The central area of structure two is for pressing the annulus that donut is arranged; The outside of central area is for pressing the solid spot that donut is arranged; Wherein annulus and solid speckle regions are coated with diffusion structure, and the diffusion structure density in structure one and the structure two on each annulus outwards is the trend that diminishes gradually by the center.
2. a kind of diffuser plate with dot matrix diffusion structure according to claim 1 is characterized in that, the diffusion structure density in described structure one and the structure two on each annulus is set according to following formula:
y＝ax+b
Wherein x is the annulus order, x=1 from inside to outside, 2,3,4....., n; Y is a diffusion structure density, and the span of y is 0-1; A, b are the linear function coefficient, and the span of a is-1-0, and b is the positive number greater than 0.
3. a kind of diffuser plate with dot matrix diffusion structure according to claim 1 is characterized in that: the diffusion structure density in described structure one and the structure two on each annulus is set according to following formula:
y
j＝a
jx
j+b
j
Y wherein
jLinear function by the m section is different is formed, and each linear function order is represented with j, j=1, and 2 ... m; x
jBe the annulus order, contain n annulus, then x if order is the function of j
jExtremely outside value is followed successively by 1,2,3 internally ... N; y
jBe diffusion structure density, span 0-1; a
j, b
jFor order is the linear function coefficient of j, wherein a
jSpan be-1-1, b
jFor greater than 0 positive number.
4. according to claim 1,2 or 3 described a kind of diffuser plates with dot matrix diffusion structure, it is characterized in that: the area of the diffusion structure dispensing area on its each annulus of described diffusion structure is set by following formula:
printing_area＝y×total_area＝S
i＝y×π×(D
i 2-D
i-1 2)
Wherein printing_area is the area of diffusion structure dispensing area in this annulus, with symbol S
iExpression; Total_area is the gross area of this annulus; D
iBe the diameter of this annulus cylindrical, D
I-1Be the diameter of a last annulus cylindrical, i=1,2,3,4....., n; Y is a diffusion structure density.
5. according to claim 1,2 or 3 described a kind of diffuser plates with dot matrix diffusion structure; It is characterized in that: it is big that described diffusion structure density is set to internal density; Outside density is little, and described internal density scope is 0.4-1.0, and outside density range is 0-0.6.
6. according to claim 1,2 or 3 described a kind of diffuser plates with dot matrix diffusion structure; It is characterized in that: solid spot of described diffusion structure and hollow spot density can be done regional adjustment, and the shape in corresponding zone comprises circle, ring-type, rectangle, triangle, trapezoidal, fan-shaped, star or polygon.
7. according to claim 1,2 or 3 described a kind of diffuser plates with dot matrix diffusion structure, it is characterized in that: solid spot of described diffusion structure and hollow spot shape comprise circle, ring-type, rectangle, triangle, trapezoidal, fan-shaped, star or polygon.
8. according to claim 1,2 or 3 described a kind of diffuser plates with dot matrix diffusion structure, it is characterized in that: described diffuser plate light transmittance is between 40% to 80%, and the diffuser plate mist degree is higher than 60%.
9. according to claim 1,2 or 3 described a kind of diffuser plates with dot matrix diffusion structure, it is characterized in that: described diffusion structure is formed by the material coating with reflection scattering nature, and its light transmittance of described material is less than 50%.
10. according to claim 1,2 or 3 described a kind of diffuser plates with dot matrix diffusion structure, it is characterized in that: described diffusion structure is arranged at the exiting surface or the incidence surface of diffuser plate.
11. one kind is adopted claim 1,2 or 3 described a kind of modules backlight with diffuser plate of dot matrix diffusion structure; Comprise backboard, light-emitting device, diaphragm; It is characterized in that: described diffuser plate is arranged between module light-emitting device backlight and the diaphragm, and its light source of described light-emitting device is that dot matrix is arranged.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210257025.0A CN102767786B (en) | 2012-07-23 | 2012-07-23 | Diffusion plate with dot-matrix diffusion structures and backlight module utilizing same |
| TW101140354A TW201405216A (en) | 2012-07-23 | 2012-10-31 | Backlight module |
| US13/846,029 US20140022762A1 (en) | 2012-07-23 | 2013-03-18 | Backlight module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210257025.0A CN102767786B (en) | 2012-07-23 | 2012-07-23 | Diffusion plate with dot-matrix diffusion structures and backlight module utilizing same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102767786A true CN102767786A (en) | 2012-11-07 |
| CN102767786B CN102767786B (en) | 2014-10-15 |
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|---|---|
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| TW (1) | TW201405216A (en) |
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| CN103900027A (en) * | 2012-12-28 | 2014-07-02 | 鸿富锦精密工业（深圳）有限公司 | Optical module |
| WO2015075251A1 (en) * | 2013-11-25 | 2015-05-28 | Koninklijke Philips N.V. | Luminaire with a light diffuser |
| US9182086B2 (en) | 2013-04-16 | 2015-11-10 | Tpv Display Technology (Xiamen) Co., Ltd. | Diffusing plate structure and backlight module |
| CN105301841A (en) * | 2015-11-23 | 2016-02-03 | 青岛海信电器股份有限公司 | Backlight module and liquid crystal display equipment |
| CN106842391A (en) * | 2015-12-03 | 2017-06-13 | 扬升照明股份有限公司 | Optical diffusing plate and light source module |
| CN110824596A (en) * | 2018-08-07 | 2020-02-21 | 中强光电股份有限公司 | Diffusion plate, direct type backlight module and display device |
| CN112180661A (en) * | 2019-07-04 | 2021-01-05 | 无锡视美乐激光显示科技有限公司 | Scattering adjusting device, light source and projection system |
| WO2021184842A1 (en) * | 2020-03-20 | 2021-09-23 | 深圳市绎立锐光科技开发有限公司 | Illumination device |
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| TWI710837B (en) * | 2019-11-21 | 2020-11-21 | 友達光電股份有限公司 | Backlight module |
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| CN110824596B (en) * | 2018-08-07 | 2021-12-14 | 中强光电股份有限公司 | Diffusion plate, direct type backlight module and display device |
| CN112180661A (en) * | 2019-07-04 | 2021-01-05 | 无锡视美乐激光显示科技有限公司 | Scattering adjusting device, light source and projection system |
| WO2021184842A1 (en) * | 2020-03-20 | 2021-09-23 | 深圳市绎立锐光科技开发有限公司 | Illumination device |
Also Published As
| Publication number | Publication date |
|---|---|
| TW201405216A (en) | 2014-02-01 |
| CN102767786B (en) | 2014-10-15 |
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