CN101424753A - Diffusing sheet, back light module unit and lcd device - Google Patents
Diffusing sheet, back light module unit and lcd device Download PDFInfo
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- CN101424753A CN101424753A CNA2007101242614A CN200710124261A CN101424753A CN 101424753 A CN101424753 A CN 101424753A CN A2007101242614 A CNA2007101242614 A CN A2007101242614A CN 200710124261 A CN200710124261 A CN 200710124261A CN 101424753 A CN101424753 A CN 101424753A
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- diffusion sheet
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Abstract
The invention relates to a diffusing piece, a back light module and a liquid crystal display device. The diffusing piece comprises a diffusing layer which comprises a basal material and optical diffusing particles dispersed in the basal material, and the ratio of the refractive rate of the optical diffusing particles and the refractive rate of the basal material is greater than or equal to 1.2.
Description
Technical field
The present invention relates to a kind of diffusion sheet, module backlight and liquid crystal indicator.
Background technology
Liquid crystal indicator generally includes display panels and the module backlight of planar light is provided to display panels.Wherein, diffusion sheet is a critical elements in the module backlight, and the light beam that is used for sending from light source evenly spreads ejaculation, makes liquid crystal indicator even brightness purpose to reach.
See also Fig. 1 and Fig. 2, Fig. 1 is a kind of three-dimensional exploded view of prior art liquid crystal indicator, and Fig. 2 is the side schematic view of diffusion sheet shown in Figure 1.This liquid crystal indicator 1 comprises the display panels 11 and the module backlight 12 of adjacent setting.Wherein, this module 12 backlight provides planar light for this display panels 11.
This module 12 backlight comprises a light guide plate 13, a reflector plate 14, a light source 15 and a diffusion sheet 16.This light guide plate 13 comprises an incidence surface 131, an exiting surface 132 adjacent with this incidence surface 131 and one and these exiting surface 132 opposed bottom surface 133.The incidence surface 131 of these light source 15 contiguous these light guide plate 13 is provided with.The bottom surface 133 of these reflector plate 14 contiguous these light guide plate 13 is provided with.The exiting surface 131 of these diffusion sheet 16 contiguous these light guide plate 13 is provided with, and is sandwiched between this light guide plate 13 and this display panels 11.
The light beam that this light source 15 sends enters this light guide plate 13 along this incidence surface 131, and a part of light beam is directly derived by this exiting surface 132, and another part light beam penetrates after 14 reflections of this reflector plate from this bottom surface 133 and derived by this exiting surface 132.The light beam that this diffusion sheet 16 is derived the exiting surface 132 of this light guide plate 13 evenly offers this display panels 11 after the diffusion.
This diffusion sheet 16 comprises the diffusion layer 160 and the basalis 161 of stacked setting.This diffusion layer 160 comprises a base material 162 and intersperses among its interior optics diffusion particle 164, and the part of this optics diffusion particle 164 protrudes from this base material 162 surfaces, thereby makes that the light beam that penetrates from this light guide plate 13 is better spread in optics diffusion particle 164 parts that protrude from these base material 162 surfaces.The material of this base material 162 is acryl resin (Acrylic Series Resin), and the material of this optics diffusion particle 164 is an acryl, and promptly the refractive index of this base material 162 and this optics diffusion particle 164 is close even equate.
Seeing also Fig. 3, is that light enters diffusion sheet 16 and the emitting brightness figure after diffusion sheet 16 is handled with 60 degree.Emergent ray and this diffusion sheet 16 normal to a surface angulations that the horizontal ordinate representative is penetrated by diffusion sheet 16 surfaces, this ordinate is represented emitting brightness.By among Fig. 3 as can be seen, light is after diffusion sheet 16 is handled, the emitting brightness numerical value of parallel emergent light about 60 degree is near 1800, and the numerical value through receiving the emitting brightness of optic angle degree in about 32 degree behind optics diffusion particle 164 deviations is only near 200, and these diffusion sheet 16 smooth convergences are relatively poor.
See also Fig. 4 again, the bright dipping intensity distribution of the light that to be the light that sends of the light source 15 of module 12 backlight penetrated by the exiting surface 132 of light guide plate 13 through light guide plate 13 backs.The circumferential coordinates of this bright dipping intensity distribution is represented out light intensity, and the representative of radius coordinate is by the emergent ray of exiting surface 132 ejaculations and the normal angulation of this exiting surface 132.As seen from Figure 4 its go out light intensity forward (0 degree) outgoing light intensity a little less than, its numerical value is not more than 2500, the light convergence is relatively poor.
As previously mentioned, light guide plate 13 forwards (0 degree) emergent light intensity a little less than, numerical value is not more than 2500, descends significantly than the emergent light intensity of left and right directions, can't effectively restrain the light of left and right directions.Again because the refractive index of the base material 162 of diffusion sheet 16 and optics diffusion particle 164 is close even may equate; be that general industry adopts refractive index to equate or close optics diffusion particle and base material; its light convergence is also relatively poor; therefore often need to use diffusion sheet collocation brightening piece to come correcting light shape; yet the brightening piece cost is higher and damage rate is not low yet; slight folding line or dirty all being easy in surface manifests; and the last diffusion sheet of the protection usefulness of also need arranging in pairs or groups usually, so that liquid crystal indicator 1 cost is higher.
Summary of the invention
Go out the lower problem of light intensity in order to solve prior art diffusion sheet forward, be necessary to provide a kind of forward to go out the higher diffusion sheet of light intensity.
Also be necessary to provide a kind of module backlight of using above-mentioned diffusion sheet.
In addition, also be necessary to provide a kind of liquid crystal indicator of using above-mentioned module backlight.
A kind of diffusion sheet, it comprises a diffusion layer, this diffusion layer comprises base material and intersperses among the interior optics diffusion particle of this base material that the ratio of the refractive index of this optics diffusion particle and the refractive index of this base material is greater than or equal to 1.2.
A kind of module backlight, it comprises the diffusion sheet of the light that a light source and this light source of reception send, this diffusion sheet comprises a diffusion layer, this diffusion layer comprises base material and intersperses among the interior optics diffusion particle of this base material that the ratio of the refractive index of this optics diffusion particle and the refractive index of this base material is greater than or equal to 1.2.
A kind of liquid crystal indicator, it comprises the module backlight that a display panels and contiguous this liquid crystal panel are provided with, this module backlight comprises the diffusion sheet of the light that a light source and this light source of reception send, this diffusion sheet comprises a diffusion layer, this diffusion layer comprises base material and intersperses among the interior optics diffusion particle of this base material that the ratio of the refractive index of this optics diffusion particle and the refractive index of this base material is greater than or equal to 1.2.
Compared to prior art, the ratio of the refractive index of the optics diffusion particle of the diffusion layer of diffusion sheet of the present invention, module backlight and liquid crystal indicator and the refractive index of this base material is greater than or equal to 1.2, the refractive index of this optics diffusion particle is relatively much larger than the refractive index of this base material, make diffusion sheet on the basis of homogenize light, play certain converging action to light, the forward that improves light goes out light intensity, thereby improves the display brightness of this module backlight and liquid crystal indicator.
Description of drawings
Fig. 1 is a kind of three-dimensional exploded view of prior art liquid crystal indicator.
Fig. 2 is the side schematic view of diffusion sheet shown in Figure 1.
Fig. 3 is that light enters diffusion sheet shown in Figure 1 and the emitting brightness figure after this diffusion sheet is handled with 60 degree.
Fig. 4 is the bright dipping intensity distribution of light guide plate shown in Figure 1.
Fig. 5 is the three-dimensional exploded view of liquid crystal indicator first embodiment of the present invention.
Fig. 6 is the side schematic view of diffusion sheet shown in Figure 4.
Fig. 7 is that light enters diffusion sheet shown in Figure 4 and the emitting brightness figure after diffusion sheet is handled with 60 degree.
Fig. 8 is the bright dipping intensity distribution of light after the diffusion sheet homogenize is handled that the light source of module backlight shown in Figure 5 penetrates.
Fig. 9 is the side schematic view of the diffusion sheet of liquid crystal indicator second embodiment of the present invention.
Figure 10 is the bright dipping intensity distribution of light after the diffusion sheet homogenize is handled that the light source of module backlight shown in Figure 9 penetrates.
Figure 11 is the side schematic view of the diffusion sheet of liquid crystal indicator the 3rd embodiment of the present invention.
Embodiment
See also Fig. 5 and Fig. 6, Fig. 5 is the three-dimensional exploded view of liquid crystal indicator first embodiment of the present invention, and Fig. 6 is the side schematic view of this diffusion sheet 26.This liquid crystal indicator 2 comprises the module backlight 22 of a display panels 21 and adjacent this display panels 21.This module 22 backlight provides planar light for this display panels 21, and it is a side-light type module backlight.
This module 22 backlight comprises a light guide plate 23, a reflector plate 24, a light source 25 and a diffusion sheet 26.This light guide plate 23 comprises an exiting surface 232, one and the incidence surface 231 that intersects with this bottom surface 233, exiting surface 232 of this exiting surface 232 opposed bottom surface 233.The incidence surface 231 of these light source 25 contiguous these light guide plate 23 is provided with.The bottom surface 233 of these reflector plate 24 contiguous these light guide plate 23 is provided with.The exiting surface 232 of these diffusion sheet 26 contiguous these light guide plate 23 is provided with, and is sandwiched between this display panels 21 and this light guide plate 23.This light source 25 be a cold cathode fluorescent tube (Cold CathodeFluorescent Lamp, CCFL).
The light beam that this light source 25 sends enters this light guide plate 23 along this incidence surface 231, and a part of light beam is directly derived by this exiting surface 231, and another part light beam is penetrated after 24 reflections of this reflector plate by this bottom surface 232, is derived by this exiting surface 232 again.The light beam that this diffusion sheet 26 is derived the exiting surface 232 of this light guide plate 23 evenly offers this display panels 21 after the diffusion.
This diffusion sheet 26 comprises the diffusion layer 260 and the basalis 261 of stacked setting.This diffusion layer 260 comprises a base material 262 and intersperses among its interior a plurality of optics diffusion particles 264, and these optics diffusion particle 264 parts protrude from this base material 262 away from these basalis 261 1 side surfaces, thereby make that the light beam that penetrates from this light guide plate 23 is better spread in optics diffusion particle 264 parts that protrude from these base material 262 surfaces.These a plurality of optics diffusion particle 264 sizes are consistent and evenly arrange and be one deck, and the spacing of adjacent optical diffusion particle 264 is equal substantially, is arranged into a uniform matrix in the plane.
The material of this base material 261 can be selected acryl material (Acrylic seriesbinder) for use, and its refractive index is 1.49.The material of this optics diffusion particle 261 is a glass, and its refractive index is 1.9.The material of this basalis 261 be polyethylene terephthalate (Polyethylene Terephthalate, PET) or polycarbonate (Polycarbonate, PC).
After the light that is penetrated by light guide plate 23 enters diffusion sheet 26, DIFFUSION TREATMENT through diffusion layer 260, can play homogenization to light, again since the refractive index of optics diffusion particle 264 relatively much larger than the refractive index of this base material 262, it also can play certain light harvesting converging action to light.
Seeing also Fig. 7, is that light enters diffusion sheet 26 and the emitting brightness figure after diffusion sheet 26 is handled with 60 degree.Emergent ray and this diffusion sheet 26 normal to a surface angulations that its horizontal ordinate representative is penetrated by diffusion sheet 26 surfaces, this ordinate is represented emitting brightness.As can be seen from Figure, light is after diffusion sheet 26 is handled, and its numerical value of receiving the emitting brightness of optic angle degree in about 32 degree approaches 2700, and the light convergence of this diffusion sheet 26 is enhanced.
Seeing also Fig. 8 again, is the bright dipping intensity distribution of light after diffusion sheet 26 homogenizes are handled of light source 25 ejaculations of module 22 backlight.The circumferential coordinates of this surface of intensity distribution is represented out light intensity, emergent ray and this diffusion sheet 26 normal to a surface angulations that the representative of radius coordinate is penetrated by diffusion sheet 26 surfaces.Scheming to go out after diffusion sheet 26 is handled as can be seen light intensity thus is enhanced at the outgoing light intensity of forward (0 degree) direction, its numerical value is near 3300, and the emergent light intensity of itself and left and right directions is close, emergent light intensity in forward (0 degree) direction can not decline to a great extent, and whole angle to go out the light intensity homogeneity consistent, it has reached suitable light convergence, therefore can avoid the use of brightening piece, reduces cost.
Compared to prior art, the refractive index of this optics diffusion particle 264 is relatively much larger than the refractive index of base material 262, make this diffusion sheet 26 except playing the effect of homogenize light, also can play certain light harvesting effect, improve forward outgoing light intensity, thereby improve the display brightness of module 22 backlight and liquid crystal indicator 2, and diffusion sheet 26 has reached suitable light convergence, therefore can avoid the use of brightening piece, reduce cost.
Seeing also Fig. 9, is the side schematic view of the diffusion sheet of liquid crystal indicator second embodiment of the present invention.The diffusion sheet 36 of this embodiment and the diffusion sheet 26 of first embodiment are roughly the same, its key distinction is: the optics diffusion particle 364 of this diffusion layer 360 is evenly arranged to two-layer, and optics diffusion particle 364 is flowed or blow over and cover completely fully in this base material, and two-layer optics diffusion particle 364 correspondences are arranged.The receipts optic angle degree of this diffusion sheet 36 is 20 degree.
Seeing also Figure 10, is the bright dipping intensity distribution of light after diffusion sheet 36 homogenizes are handled of the light source ejaculation of module backlight.It goes out light intensity and further increases at the outgoing light intensity of forward (0 degree) direction figure as can be seen thus, and the light convergence is better.
Seeing also Figure 11, is the side schematic view of the diffusion sheet of liquid crystal indicator the 3rd embodiment of the present invention.The diffusion sheet 46 of this embodiment and the diffusion sheet 26 of first embodiment are roughly the same, its key distinction is: optics diffusion particle 464 is two-layer arrangement in base material 462, these two-layer optics diffusion particle 464 intervals are arranged in a crossed manner, these optics diffusion particle 464 whole this base material 462 inside that are filled in, the refractive index of this base material 462 is 1.49, and the refractive index of this optics diffusion particle 464 is 2.2.
Yet, it is described that the present invention is not limited to above-mentioned embodiment, for example: the ratio of the refractive index of optics diffusion particle and the refractive index of base material can play certain light harvesting effect and improve forward outgoing light intensity more than 1.2, it is not limited to the cited numerical value of above-mentioned embodiment; The grain size of these a plurality of optics diffusion particles and refractive index can be inequality; These a plurality of optics diffusion particles are to intersperse among in a jumble in the base material of this diffusion layer, are not necessarily to arrange layer by layer; This module backlight also can be down straight aphototropism mode set; The substrate material of diffusion sheet can be selected the acryl material for use, and light penetrating copolymer (polymer) material is as polycarbonate or the like, as long as can evenly mix with the optics diffusion particle; The refractive index n of this base material is selected for use about 1.45-1.55; This optics diffusion particle can be selected glass material or other high index of refraction organic filler for use, and its refractive index is about 1.9-2.2; The optics diffusion particle is multilayer in base material arranges, and is not one to be decided to be one or two layer; When the optics diffusion particle was the multilayer arrangement, the optics diffusion particle on the adjacent layer can correspondingly be provided with, also cross arrangement at interval.
Claims (10)
1. diffusion sheet, it comprises base material and intersperses among optics diffusion particle in this base material that it is characterized in that: the ratio of the refractive index of this optics diffusion particle and the refractive index of this base material is greater than or equal to 1.2.
2. diffusion sheet as claimed in claim 1 is characterized in that: the material of this base material is acryl material or light penetrating copolymer, and the material of this optics diffusion particle is a glass.
3. diffusion sheet as claimed in claim 1 is characterized in that: the refractive index of this base material is 1.45-1.55, and the refractive index of this optics diffusion particle is 1.9-2.2.
4. diffusion sheet as claimed in claim 1 is characterized in that: the refractive index of this base material is 1.5, and the refractive index of this optics diffusion particle is 1.9 or 2.2.
5. diffusion sheet as claimed in claim 1 is characterized in that: this optics diffusion particle size is consistent and evenly arrange and be multilayer for one deck or in base material and arrange.
6. diffusion sheet as claimed in claim 5 is characterized in that: this optics diffusion particle is multilayer to be arranged, and the optics diffusion particle of corresponding setting of the optics diffusion particle of adjacent layer or adjacent layer is arranged in a crossed manner at interval.
7. diffusion sheet as claimed in claim 1 is characterized in that: this diffusion sheet further comprises a basalis, this basalis and the stacked setting of this diffusion layer.
8. diffusion sheet as claimed in claim 7 is characterized in that: this optics diffusion particle is whole to be filled in inner or this optics diffusion particle of this base material and partly to protrude from this base material away from this basalis one side surface.
9. module backlight, it comprises a light source and a diffusion sheet, this diffusion sheet receives the light that this light source sends, and it is characterized in that: this diffusion sheet is the described diffusion sheet of arbitrary claim in the claim 1 to 8.
10. liquid crystal indicator, it comprises the module backlight of a liquid crystal panel and contiguous this liquid crystal panel, this module backlight comprises the diffusion sheet of the light that a light source and this light source of reception send, and it is characterized in that: this diffusion sheet is the described diffusion sheet of arbitrary claim in the claim 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101242614A CN101424753A (en) | 2007-11-02 | 2007-11-02 | Diffusing sheet, back light module unit and lcd device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101242614A CN101424753A (en) | 2007-11-02 | 2007-11-02 | Diffusing sheet, back light module unit and lcd device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101424753A true CN101424753A (en) | 2009-05-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007101242614A Pending CN101424753A (en) | 2007-11-02 | 2007-11-02 | Diffusing sheet, back light module unit and lcd device |
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| Country | Link |
|---|---|
| CN (1) | CN101424753A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102681040A (en) * | 2011-03-18 | 2012-09-19 | 住友化学株式会社 | Polarizer protective film |
| CN107908014A (en) * | 2017-12-28 | 2018-04-13 | 广州弥德科技有限公司 | A kind of large scale directive property backlight bore hole 3D display system |
| CN107976730A (en) * | 2016-10-21 | 2018-05-01 | 苏州今道创业投资有限公司 | A kind of diffusion barrier |
| CN108845383A (en) * | 2018-06-26 | 2018-11-20 | 厦门天马微电子有限公司 | A kind of prismatic lens, backlight module and display device |
-
2007
- 2007-11-02 CN CNA2007101242614A patent/CN101424753A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102681040A (en) * | 2011-03-18 | 2012-09-19 | 住友化学株式会社 | Polarizer protective film |
| CN107976730A (en) * | 2016-10-21 | 2018-05-01 | 苏州今道创业投资有限公司 | A kind of diffusion barrier |
| CN107908014A (en) * | 2017-12-28 | 2018-04-13 | 广州弥德科技有限公司 | A kind of large scale directive property backlight bore hole 3D display system |
| CN108845383A (en) * | 2018-06-26 | 2018-11-20 | 厦门天马微电子有限公司 | A kind of prismatic lens, backlight module and display device |
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Open date: 20090506 |