CN101261329A

CN101261329A - Diffusing plate

Info

Publication number: CN101261329A
Application number: CNA2007100867168A
Authority: CN
Inventors: 蔡昇颖; 施希弦; 郑世楷
Original assignee: Chi Lin Technology Co Ltd
Current assignee: Chi Lin Technology Co Ltd
Priority date: 2007-03-06
Filing date: 2007-03-06
Publication date: 2008-09-10

Abstract

The invention discloses a diffusion plate, comprising a basis material with four adjacent lateral sides as well as a plurality of long cavities which are arranged in the basis material and run through the two lateral sides and each long cavity has an arc surface. The design of the long cavity can lead the diffusion plate to have the efficacies of high diffusion rate and high penetration rate, and can improve the evenness and luminance of a backlight module, etc.

Description

Diffuser plate

Technical field

The present invention is a kind of module backlight, particularly relates to a kind of diffuser plate that is used to make the even scattering of light of light source.

Background technology

The module backlight (BLM) of LCD (LCD), can be different with illumination mode because of the light source configuration, and design kenels such as side-light type (side lighting) and straight-down negative (bottom lighting) are arranged, all be to represent in the following description with down straight aphototropism mode set.General down straight aphototropism mode set can be installed a slice diffuser plate above a light source, in order to fuzzy light source profile, and cause the light large angle scattering, and feasible distribution of light from light source becomes an area source.

For the light that allows light source penetrate; behind the process optical effect of diffuser plate; can produce uniform light; and improve module brightness backlight and equal briliancy; at present diffuser plate is on structural design, usually can be in a polymer base material blending small amounts of inorganic or organic filler, or add the diffusion layer that contains particle on the upper and lower surface of base material; to utilize the difference of refractive index between particle and base material, cause the diffusion effect of light.

The method of the inorganic or organic filler of above-mentioned doping, though can increase the light diffusivity, yet, the particle that this method is added, but can the absorbing light energy and reduce the light penetration rate, make the problem of the light generation hue shift that sees through this diffuser plate, and face the cut-throat competition on the LCD market, so the transmittance of this module backlight still remains to be improved, therefore also must develop the diffuser plate design that can increase diffusivity and penetrance.

Summary of the invention

Fundamental purpose of the present invention is to be to provide a kind of high diffusivity and high penetration of having concurrently, can promote the diffuser plate of the uniformity coefficient and the briliancy of module backlight.

A kind of diffuser plate of the present invention comprises: one has the base material of four adjacent sides, and most arrays are in this base material and connect the microscler hole of dual-side wherein respectively, and each microscler hole all has a cambered surface.

Effect of the present invention is: by the design of microscler hole in base material, diffuser plate is reached with high diffusivity and high penetration, and can promote effects such as the uniformity coefficient of module backlight and briliancy.

Description of drawings

Fig. 1 is a stereographic map of one first preferred embodiment of diffuser plate of the present invention;

Fig. 2 is this first preferred embodiment-cross-sectional schematic;

Fig. 3 is a cross-sectional schematic of one second preferred embodiment of diffuser plate of the present invention;

Fig. 4 is a cross-sectional schematic of one the 3rd preferred embodiment of diffuser plate of the present invention;

Fig. 5 be diffuser plate of the present invention one the 4th preferred embodiment one overlook cross-sectional schematic;

Fig. 6 is a cross-sectional schematic of one the 5th preferred embodiment of diffuser plate of the present invention;

Fig. 7 is a cross-sectional schematic of one the 6th preferred embodiment of diffuser plate of the present invention; And

Fig. 8 is a cross-sectional schematic of one the 7th preferred embodiment of diffuser plate of the present invention.

Embodiment

The present invention is described in detail below in conjunction with drawings and Examples:

For convenience of description, following embodiment, components identical is represented with identical label.

As Fig. 1 and shown in Figure 2, first preferred embodiment of diffuser plate of the present invention is mounted in the module backlight (figure do not show), and the position is in the light source top of (figure does not show), and comprises: a base material 1, and most microscler holes 2.

This base material 1 is a rectangular flat, and thickness is 1.0mm～10mm, and have a bottom surface 11 towards light source, in contrast to the bottom surface 11 end face 12, and four uprightly be engaged on top, 12,11 of bottom surfaces and adjacent side 13.The material of this base material 1 is to be selected from least a transparent polymer material, for example: polymethylmethacrylate (PMMA), polycarbonate (PC), methyl methacrylate/styrol copolymer (MS), cyclic olefine copolymer (mCOC), polystyrene (PS), and poly-4-methylpentene 1 (TPX).

Described microscler hole 2 be in parallel to each other array in this base material 1, vertically run through two opposition side limits 13 respectively, the transverse cross-sectional shape of each microscler hole 2 all is rounded, diameter width is 0.1mm～9.5mm, and just each microscler hole 2 all has one long to extending and around the cambered surface 21 of sealing into cast along it.

What must further specify is, diffuser plate is to see through special-shaped extrusion facility (figure does not show) or foundry machinery (figure does not show) on making, with special-shaped extrusion of selected transparent polymer material one or casting is dull and stereotyped, formation contains the base material 1 of microscler hole 2, makes that each horizontal section of this diffuser plate is all identical.Because the structure and the method for making of these abnormal shape extrusion facility and foundry machinery are general technology, so no longer describe in detail at this.

During use, the light that sends when light source upwards exposes to the bottom surface 11 of base material 1, and penetrate in the process of base material 1, light can constantly pass at

base material

1 and 2 of circular microscler holes, many refractions will take place in light at the same time, the phenomenon of reflection and scattering, for example shown in each the arrow path among Fig. 2, so just caused the effect of optics diffusion, can blur the light source profile, make the light luminance of launching end face 12 be evenly distributed, and can cause the light large angle scattering, and make diffuser plate with high diffusivity and high penetration, can promote the uniformity coefficient and the briliancy of module backlight.

As shown in Figure 3, it is second preferred embodiment of diffuser plate of the present invention, the structure of present embodiment is roughly identical with first embodiment, different parts are: the section shape difference of microscler hole 2, the transverse cross-sectional shape of each microscler hole 2 of present embodiment all is fan-shaped, except having a cambered surface 21, have more two inclined-planes 22 that extend and be connected in opposite directions by the both sides inclination of cambered surface 21 respectively.And described microscler hole 2 is and is misplaced arrangement, just 21 of two adjacent and cambered surfaces 2 of the microscler holes at top, all be arranged with 21 microscler holes 2 of a cambered surface in the bottom, can reach preferable optics diffusion effect during use equally.Certainly in design, microscler hole 2 also can have the transverse cross-sectional shape of cambered surface 21, for example ovalize, or fillet rhombus for other ... Deng, no longer describe in detail at this.

As shown in Figure 4, be the 3rd preferred embodiment of diffuser plate of the present invention, the present embodiment part different with above-mentioned described embodiment is: diffuser plate comprises that most are dispersed in the base material 1, and refractive index differs from the scattering particle 3 of base material 1.The addition of described scattering particle 3 is 0.05～30 weight %, and particle size is 1 μ m～100 μ m.In design, described scattering particle 3 can be by polycarbonate (PC), or is made by acryl (Acrylic).During use, light can constantly pass in the different medium of

base material

1 and 3 two refractive indexes of scattering particle, though scattering particle 3 can absorb partly luminous energy, but cambered surface 21 designs via the microscler hole 2 of collocation, really can make light scattering more equably, shown in each the arrow path among the figure, so compare down the diffusion effect that can reach high-quality equally.

As shown in Figure 5, it is the 4th preferred embodiment of diffuser plate of the present invention, the structure of present embodiment is roughly identical with first to the 3rd embodiment, and different parts are: described microscler hole 2 is to run through described side 13 obliquely, and just microscler hole 2 is not to be vertical with the angle of described side 13.

As shown in Figure 6, it is the 5th preferred embodiment of diffuser plate of the present invention, the structure of present embodiment is roughly identical with first and second embodiment, different parts are: the present embodiment diffuser plate comprises that also one deck is combined in the diffusion layer 4 on the end face 12 of this base material 1, and most are dispersed in the diffusion layer 4 and refractive index differs from the scattering particle 3 of diffusion layer 4.On making, can adopt the coating of rotation or roller, perhaps mode such as die head coating has the diffusion layer 4 of scattering particle 3 to be coated on the end face 12 blending.During use, launch the light of substrate 1 end face 12, at once by diffusion layer 4 and scattering particle 3, through even diffusion again, so can have better diffusion effect.In addition, also can make this diffusion layer 4 make in design, and the setting of omitting scattering particle 3 just is shifted described microscler hole 2 downwards, makes that the top side of base material 1 is thicker relatively, to be considered as one deck diffusion layer 4, no longer describes in detail at this with base material 1 consubstantiality.

As shown in Figure 7, be the 6th preferred embodiment of diffuser plate of the present invention, the structure of present embodiment is roughly identical with the 5th embodiment, and different parts are: the present embodiment diffuser plate is to have the diffusion layer 4 of scattering particle 3 to be combined on the bottom surface 11 of this base material 1 blending.Similarly, also can make these diffusion layer 4 consubstantialities be formed on the bottom surface 11 of base material 1 in design, can certainly the diffusion layer 4 that a blending has scattering particle 3 all be set, no longer describe in detail at this in top,

bottom surface

12,11.

As shown in Figure 8, the 7th preferred embodiment and first and second embodiment of diffuser plate of the present invention are roughly the same, different parts are: the present embodiment diffuser plate comprises that a more direct lining is combined in the light-collecting layer 5 on this base material 1, this light-collecting layer 5 has a faying face 51 that is combined on this end face 12, and one in contrast to faying face 51 and be continuously non-smooth rib convex surface 52.This rib convex surface 52 has most protuberances 521, in design each protuberance 521 can be pointed for tooth taper, rib, flat column, cylindric or semi-cylindrical ... etc. shape, so its shape and size are not exceeded with present embodiment, and this light-collecting layer 5 can be made into integration in substrate 1 special-shaped extrusion and casting.During use, the light after the diffusion can directly upwards pass through light-collecting layer 5, to dwindle the diffusion angle of light via rib convex surface 52, is to have the optically focused effect, can promote brightness, and can improve positive briliancy and increase utilization benefit.

By above explanation as can be known, diffuser plate of the present invention in design, be in solid base material 1, to have provided microscler hole 2, to utilize hollow elongated hole 2 cambered surface 21 designs on every side, form the function of similar concavees lens, the total reflection effect of the solid material of arranging in pairs or groups produces the function of diffusion, so can have high diffusivity and high penetration simultaneously concurrently, and can promote effects such as the uniformity coefficient of module backlight and briliancy.

Claims

1. diffuser plate, comprise a base material, this base material has the adjacent side in four sides, it is characterized in that: this diffuser plate also comprises most arrays in this base material and connect the microscler hole of dual-side wherein respectively, and each microscler hole all has a cambered surface.

2. diffuser plate as claimed in claim 1 is characterized in that: the microscler hole in this base material is to be arranged in parallel.

3. diffuser plate as claimed in claim 1 is characterized in that: the transverse cross-sectional shape of each microscler hole all is rounded, and this cambered surface is around sealing into cast.

4. diffuser plate as claimed in claim 1 is characterized in that: the transverse cross-sectional shape of each microscler hole all is an ovalize, and this cambered surface is around sealing into cast.

5. diffuser plate as claimed in claim 1 is characterized in that: the transverse cross-sectional shape of each microscler hole all is to be fan-shaped, and each microscler hole also has two inclined-planes that extended and be connected in opposite directions by the both sides inclination of cambered surface respectively.

6. diffuser plate as claimed in claim 5 is characterized in that: described microscler hole is and is misplaced arrangement, is between two the adjacent and microscler holes of cambered surface position at the top, is arranged with the microscler hole of a cambered surface position in the bottom.

7. diffuser plate as claimed in claim 1 is characterized in that: the thickness of this base material is 1.0mm～10mm.

8. as claim 1 or 7 described diffuser plates, it is characterized in that: the width of each microscler hole is 0.1mm～9.5mm.

9. diffuser plate as claimed in claim 1 is characterized in that: this diffuser plate comprises that also most are dispersed in the base material and refractive index differs from the scattering particle of base material.

10. diffuser plate as claimed in claim 9 is characterized in that: the addition of described scattering particle is 0.05～30 weight %, and the mean grain size size of scattering particle is 1 μ m～100 μ m.

11. diffuser plate as claimed in claim 1 is characterized in that: this base material also has an end face and a bottom surface that is engaged between described side, and this diffuser plate also comprise one deck be combined in end face and bottom surface at least the one side on diffusion layer.

12. diffuser plate as claimed in claim 11 is characterized in that: this diffuser plate comprises that also most are dispersed in the diffusion layer and refractive index differs from the scattering particle of diffusion layer.

13. diffuser plate as claimed in claim 1, it is characterized in that: this base material also has an end face that is engaged between the apical margin of described side, and this diffuser plate also comprises the light-collecting layer on the direct end face that is combined in this base material that is covered of one deck, this light-collecting layer has a faying face that is combined on this end face, and one in contrast to faying face and be continuously non-smooth rib convex surface.