CN1908756A - Dispersion brightening device - Google Patents
Dispersion brightening device Download PDFInfo
- Publication number
- CN1908756A CN1908756A CN 200510088995 CN200510088995A CN1908756A CN 1908756 A CN1908756 A CN 1908756A CN 200510088995 CN200510088995 CN 200510088995 CN 200510088995 A CN200510088995 A CN 200510088995A CN 1908756 A CN1908756 A CN 1908756A
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- diffuser plate
- dispersion
- light
- brightening device
- gain layer
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Abstract
The disclosed diffusion brightening device above light source of back light module comprises: a diffusion plate with a first surface near the light source and an opposite second surface to even diffuse light from the first surface outwardly, and a gain layer on the second surface to centralize emit the diffused light. This invention can reduce cost and improve transmittance.
Description
Technical field
The present invention is a kind of module backlight, particularly relates to a kind of dispersion brightening device that is used to make the even scattering of light of light source.
Background technology
Module backlight (BLM) is the key part and component of LCD (LCD), because liquid crystal itself can't be luminous, therefore must will put or line source changes the area source of high brightness and uniform brilliance into through the module backlight at rear, allow liquid crystal panel be able to luminous show image.And because light source configuration and illumination mode different, module backlight is common to have side-light type (side lighting) and straight-down negative (bottom lighting) etc. to design kenels, all is to represent with down straight aphototropism mode set in following explanation.
As Fig. 1 and shown in Figure 2, a kind of down straight aphototropism mode set in the past 1 is mounted in the below of a liquid crystal panel 2, and comprise: the cassette holder 11 of upper shed on one day, and from bottom to top be installed in a light source 12, a slice diffuser plate (Diffuser) 13 and a slices gain sheets (Brightness Enhance Film) 14 in this cassette holder 11 in regular turn.This light source 12 generally can be cold cathode fluorescent tube (CCFL) or light emitting diode (LED), is that several cold cathode fluorescent tubes are installed on cassette holder 11 herein.This diffuser plate 13 be the position above light source 12, can blur light source 12 profiles, and cause the light large angle scattering, make that the light from light source 12 evenly is scattered in an area source.This gain sheet 14 be gap digit above diffuser plate 13, concentrate refraction to liquid crystal panel 2 light after the diffusion, in order to promote brightness.Be formed with a gap 15 at diffuser plate 13 and 14 of sheets of gain.
The light that sends when light source 12 upwards shines, after seeing through the equal light action of diffuser plate 13, the outside scattering of meeting is by gap 15 and enter gain sheet 14, be used for revising radiation direction with light harvesting via gain sheet 14, reach and improve positive briliancy and the purpose that increases utilization benefit, last light can upwards expose to liquid crystal panel 2 again, makes liquid crystal panel 2 luminous display effects.
Though the light that above-mentioned light source 12 penetrates is behind the optical effect through diffuser plate 13 and gain sheet 14, uniform light can be produced and brightness and equal briliancy can be improved, yet the structural design and the assembling process of this diffuser plate 13 and gain sheet 14 but have following unfavorable part:
(1), make trouble: above-mentioned diffuser plate 13 is two independent plates that separate with gain sheet 14, after make going up moulding separately, through cutting respectively, at last again winding in regular turn on cassette holder 11, need cut and twice installation process through twice, so manufacture process is comparatively loaded down with trivial details, slow.And, this diffuser plate 13 and 14 of sheets of gain are formed with gap 15, and the influence that optical effect is produced for fear of the medium that is stored in the gap 15 is so this diffuser plate 13 must be assembled in dust free room with gain sheet 14, assembling process comparatively bothers, and cost is also expensive.
(2), the upright thickness of group is bigger: after this module 1 assembling backlight, it is gapped 15 that diffuser plate 13 and 14 of sheets of gain are separated by, and it is bigger that this structural design will cause the group of module 1 backlight to found thickness, do not meet lightening design requirement.
(3), transmittance is lower: the light that scatters diffuser plate 13, can be irradiated into gain sheet 14 again through this gap 15 earlier, be full of air in the gap 15, just the refractive index of air is generally 1, and the refractive index of diffuser plate 13 is approximately 1.59, according to total reflection law (total internal reflection), light is incident upon when dredging medium by close medium, when incident angle will produce total reflection during greater than critical angle, this moment, light was again in the close medium of reflected back, so when light exposes to gap 15 by diffuser plate 13, just have portions of light line generation total reflection phenomenon, the light quantity that causes entering gain sheet 14 reduces, and makes that at last the transmittance of light is not good, brightness reduces, and records its transmittance T=34% through this case applicant experiment.
Lifting along with the LCD manufacturing technology, in lightweight, slimming, low power consumption, high brightness and low cost ... under main flow trend, face the cut-throat competition on the market, the integral thickness of above-mentioned module backlight 1 must reduce, transmittance also remains to be improved, diffuser plate 13 also must be developed novel design with the structure and the manufacturing process of gain sheet 14, and the present invention is combined into one diffuser plate 13 and gain sheet 14 exactly, in order to address the above problem.
Summary of the invention
Fundamental purpose of the present invention is to be to provide a kind of dispersion brightening device that can simplify processing procedure, reduce cost.
Another object of the present invention is just at the dispersion brightening device that a kind of group of upright thinner thickness is provided.
A further object of the present invention is just providing a kind of dispersion brightening device that improves transmittance.
A kind of dispersion brightening device of the present invention is the light source top that correspondence is installed in a module backlight, and comprises: a slice diffuser plate, and a slice gain layer.This diffuser plate has the first surface of a contiguous light source, and the second surface in contrast to first surface, and the source light that is used for entering first surface evenly scatters outside the second surface.This gain layer directly lining is combined on the second surface of this diffuser plate, is used to make the light of scattering to concentrate ejaculation.
A kind of dispersion brightening device of the present invention have make simple, can omit installation steps, can save man-hour, reduce cost, and can reach lightening simultaneously, and improve effect such as transmittance.
Description of drawings
The present invention is described in detail below in conjunction with drawings and Examples:
Fig. 1 is the assembling cross-sectional schematic of the concise and to the point structure of module backlight in the past;
Fig. 2 is that a slice diffuser plate of module backlight in the past and the part of a slice gain sheet are amplified cross-sectional schematic;
Fig. 3 is that a preferred embodiment of dispersion brightening device of the present invention is installed in an assembling cross-sectional schematic in the module backlight;
Fig. 4 is that the part of this preferred embodiment is amplified cross-sectional schematic.
Embodiment
Consult Fig. 3 and Fig. 4, the preferred embodiment of dispersion brightening device of the present invention is mounted in the module 3 backlight, and the position is below a slice liquid crystal panel 4, this module 3 backlight comprises opening cassette holder 31 up, and a plurality of intervals are installed in the light source (Light source) 32 in this cassette holder 31.This light source 32 is several the cold cathode fluorescent lamp pipes (CCFL) that are the U type, line source can be provided, in design, the quantity of light source 32 also can be one, and the shape of fluorescent tube also can be straight type, L type and W type, certainly this light source 32 also can provide an area source, for example is made into plane CCFL, carbon nanotube, light emitting diode (LED) or electroluminescence sheet (EL) or the like.And present embodiment is to be that example explains with the down straight aphototropism mode set, and the present invention also can be installed in the side-light type module backlight in design certainly, no longer describes in detail at this.
Dispersion brightening device 5 of the present invention is mounted in the opening part of cassette holder 31, and the position is 4 of light source 32 and liquid crystal panels, and comprises: a slice diffuser plate 51 reaches a slice gain layer 52.
This diffuser plate 51 has a slice tabular base material 511, a plurality of first surface 513 that is dispersed in scattering particle 512 in the base material 511, position in a side of these base material 511 contiguous light sources 32, and a position is at the second surface 514 of this base material 511 in contrast to a side of first surface 513.In design, can select this base material 511 is to be made by acryl (Acrylic), and scattering particle 512 is to be made by polycarbonate (PC), or can adopt this base material 511 is to be made by polystyrene (PS), and scattering particle 512 is the designs of being made by acryl (Acrylic).This diffuser plate 51 can be used for evenly scattering outside the second surface 514 entering light source 32 light of first surface 513.
This gain layer 52 is to be made by epoxy resin (epoxy resin) or acryl resin (acrylic resin), be that directly lining is combined on this diffuser plate 51, and have a faying face 521 on the second surface 514 that is combined in this diffuser plate 51, and one in contrast to faying face 521 and be non-smooth rib convex surface 522 continuously.This rib convex surface 522 has the protuberance 523 of a plurality of tooth tapers, and certainly in design, each protuberance 523 also can be pointed for rib, flat column, cylindric or semi-cylindrical ... Deng, so the shape of protuberance and size are not exceeded with present embodiment.This gain layer 52 has the optically focused effect, can be with the light correcting directive liquid crystal panel 4 after the diffusion, in order to promote brightness.
The light that sends when light source 32 upwards exposes to the first surface 513 of diffuser plate 51, and penetrate in the process of diffuser plate 51, light can constantly pass in the different medium of base material 511 and 512 two refractive indexes of scattering particle, many refractions will take place in light at the same time, the phenomenon of reflection and scattering, so just caused the effect of optics diffusion, can blur light source 32 profiles, make the light luminance of launching second surface 514 be evenly distributed, and cause the even scattering of light wide-angle, then light can make progress and directly enter gain layer 52 by faying face 521, with the rib convex surface 522 diffusion angle of dwindling light via gain sheet 52, improve positive briliancy and increase utilization benefit in order to revise radiation direction, last light can upwards expose to liquid crystal panel 4, makes liquid crystal panel 4 luminous display effects.
During manufacturing, on the second surface 514 of this diffuser plate 51, be coated with the resin material of predetermined composition of (Coating) one deck and thickness earlier, then utilize a roller (figure does not show) on this resin material, to roll, owing to disposed a die (scheming not show) with rib convex surface 522 shape complementarities on this roller, so after the roller roll extrusion, will on the surface of resin material, be formed with rib convex surface 522 shapes relatively, then utilize ultraviolet light (UV) irradiation that resin material is solidified again, just can on diffuser plate 51, form gain layer 52.Certainly on making, also can be alternate manner, so state bright exceeding not.
By above explanation as can be known, the present invention has a following good advantage that more in the past was making with textural:
(1), can simplify processing procedure, reduce cost: the present invention is combined into one diffuser plate 51 and gain layer 52 exactly, just direct in conjunction with gain layer 52 on diffuser plate 51 with optically focused effect, can behind connecting shaping, once cut on making, then again winding on cassette holder 31, need only be through once cutting and the one-step installation process, thus manufacture process is comparatively simplified, rapidly.And because this diffuser plate 51 is direct connecting shapings with gain layer 52, gap that can't influential optical effect exists, thus need be in dust free room during assembling, so assembling process is comparatively simple, and can reduce cost relatively.
(2), the upright thickness of group is bigger: the gain layer 52 of this dispersion brightening device 5 is stacked being combined on the diffuser plate 51, is not formed with the gap between the two, and the upright thickness of its group will be smaller than in the past relatively, can meet lightening now design requirement.
(3), improve transmittance and brightness: because gain layer 52 is to be molded on the diffuser plate 51, so light can directly be refracted in the gain layer 52 by diffuser plate 51, can't produce total reflection phenomenon, therefore light can enter gain layer 52 in a large number, make the light quantity that exposes to liquid crystal panel 4 increase relatively, the transmittance of light is preferable, can promote brightness, records its transmittance T=57% through this case applicant experiment.
By above explanation as can be known, dispersion brightening device 5 of the present invention in design, be to adopt one in conjunction with design, be on diffuser plate 51, directly to be coated with this gain layer 52 of imprinting moulding, just the prism function with gain layer 52 is incorporated on the diffuser plate 51, but simplified construction, so have make simple, can omit installation steps, can save man-hour, reduce cost, and can reach lightening simultaneously, and improve effect such as transmittance.
Claims (8)
1. dispersion brightening device, be the light source top that correspondence is installed in a module backlight, and comprise a slice diffuser plate, the first surface that this diffuser plate has a contiguous light source and enters for source light, and one in contrast to first surface and the second surface that allows source light evenly scatter out
It is characterized in that: this dispersion brightening device also comprises on the direct second surface that is combined in this diffuser plate that is covered of a slice and is used to make the light of scattering to concentrate the gain layer that penetrates.
2. dispersion brightening device as claimed in claim 1 is characterized in that: this gain layer has a faying face on the second surface that is combined in this diffuser plate, and one in contrast to faying face and be non-smooth rib convex surface continuously.
3. dispersion brightening device as claimed in claim 2 is characterized in that: the rib convex surface of this gain layer has the protuberance of a plurality of tooth tapers.
4. dispersion brightening device as claimed in claim 1 is characterized in that: this diffuser plate also has a plate substrate, and a plurality of scattering particles that are dispersed in the base material.
5. dispersion brightening device as claimed in claim 4 is characterized in that: the base material of this diffuser plate is to be made by acryl, and scattering particle is to be made by polycarbonate.
6. dispersion brightening device as claimed in claim 4 is characterized in that: the base material of this diffuser plate is to be made by polystyrene, and scattering particle is to be made by acryl.
7. dispersion brightening device as claimed in claim 1 is characterized in that: this gain layer is to be made by epoxy resin.
8. dispersion brightening device as claimed in claim 1 is characterized in that: this gain layer is to be made by acryl resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510088995 CN1908756A (en) | 2005-08-04 | 2005-08-04 | Dispersion brightening device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510088995 CN1908756A (en) | 2005-08-04 | 2005-08-04 | Dispersion brightening device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1908756A true CN1908756A (en) | 2007-02-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510088995 Pending CN1908756A (en) | 2005-08-04 | 2005-08-04 | Dispersion brightening device |
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|---|---|
| CN (1) | CN1908756A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101393283B (en) * | 2007-09-21 | 2010-12-01 | 鸿富锦精密工业（深圳）有限公司 | Prismatic lens and LCD employing the prismatic lens |
| CN101344678B (en) * | 2007-07-12 | 2011-07-27 | 鸿富锦精密工业（深圳）有限公司 | Optical plate and preparation method thereof |
| CN114755755A (en) * | 2022-04-25 | 2022-07-15 | 祝佳丽 | Optical fiber panel and preparation method thereof, and curtain for projection and preparation method thereof |
-
2005
- 2005-08-04 CN CN 200510088995 patent/CN1908756A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101344678B (en) * | 2007-07-12 | 2011-07-27 | 鸿富锦精密工业（深圳）有限公司 | Optical plate and preparation method thereof |
| CN101393283B (en) * | 2007-09-21 | 2010-12-01 | 鸿富锦精密工业（深圳）有限公司 | Prismatic lens and LCD employing the prismatic lens |
| CN114755755A (en) * | 2022-04-25 | 2022-07-15 | 祝佳丽 | Optical fiber panel and preparation method thereof, and curtain for projection and preparation method thereof |
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