CN1858641B - Full coated high penetration type brightening optical module suitable for liquid crystal display - Google Patents
Full coated high penetration type brightening optical module suitable for liquid crystal display Download PDFInfo
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- CN1858641B CN1858641B CN2005100682887A CN200510068288A CN1858641B CN 1858641 B CN1858641 B CN 1858641B CN 2005100682887 A CN2005100682887 A CN 2005100682887A CN 200510068288 A CN200510068288 A CN 200510068288A CN 1858641 B CN1858641 B CN 1858641B
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Abstract
This invention discloses a high penetration light-increasing optical component including forming a LC film of the cholesterin phase and an 1/4 wavelength delay film on a matrix orderly and further including forming a polarized film on the delay film, in which, the first two films are formed by coating and the polarized film is formed by coating or adhering a pre-formed polarized film on the delay film. This invention with the polarized film combines the high penetration light increasing optical component with the backlight module of the LED with the polarized film as the brightness increased polarized light source of a LED.
Description
Technical field
The present invention is mainly used in the high-penetration type blast optical module of backlight LCD, especially about a kind of high-penetration type blast optical module that is applied to be integrated with on the backlight LCD light polarizing film.
Background technology
In all flat-panel screens, LCD be unique utilize linearly polarized light cause bright, secretly reach GTG.At first, produced the line polarisation after the light that is come by backlight module is handled through the polaroid assembly; Along with the arrangement of liquid crystal molecule is reversed, produce bright dark variation, and enriched displaying contents.
Yet at present the total brightness of LCD only be that its backlight provided 4～6%, the dichromatism polaroid assembly that absorbs half incident light is one of damnous main cause.Therefore, handle earlier if incident light can be done one, make it before not entering the polaroid assembly, all convert the linearly polarized light that can penetrate the polaroid assembly fully to earlier, then the usefulness of incident light can significantly improve, and improves the not good enough problem of present LCD brightness.
Not light absorbing reflecting type polarizing chip module itself is as the blast optical module of LCD, and wherein a kind of is the cholesterol liquid crystal reflecting type polarizing chip module of handling circularly polarized light.The principle of so-called cholesterol liquid crystal reflecting type polarizing chip module is to utilize the stalling characteristic of the special circularly polarized light of cholesteric liquid crystal layer, it can isolate left and right sides rounding polarized light with the not polarization white light of an incident, one of them penetrable cholesteric liquid crystal layer, the circularly polarized light of another sense of rotation then is reflected.Use a simple reflex face can easily the circularly polarized light that is reflected by cholesteric liquid crystal layer originally be inverted to transparent circularly polarized light (backlight module of LCD promptly contains this reflex mechanism usually), can pass through cholesteric liquid crystal layer this moment, forms the circularly polarized light of two times of single sense of rotation of light intensity.Can fully convert the not polarization white light of incident the linearly polarized light of two times light intensities as if the one 1/4 wavelength retardation plates of fitting at cholesteric liquid crystal layer this moment, and its light wave plane of polarization is just consistent with the light transmission shaft of line light polarizing film, reaches the effect of blast.One similar cholesterol liquid crystal reflecting type polarizing chip module is disclosed in United States Patent (USP) 5,506, and No. 704, the content of this case is merged in this case in the reference mode.
United States Patent (USP) 5,506, be for No. 704 with cholesterol liquid crystal fit 1/4 wavelength retardation plate and a polaroid and make a reflecting type polarizing chip module, its employed 1/4 wavelength retardation plate is to make film earlier with extruding (extrude) or with Rong Ji Rong casting (solvent casting), and stretching through precision forms again.For being assembled into above-mentioned reflecting type polarizing chip module, this 1/4 wavelength retardation plate need be gone up optical cement one, with guarantee can the success fit on this cholesterol liquid crystal.For guaranteeing the integrality before 1/4 wavelength retardation plate uses; it is fitted with diaphragm; therefore outer protective film need be removed earlier before the step of fitting and just the applying of this optical cement can be carried out; such operation not only expends extra material, increases the complicacy of processing procedure, and the interface that has more increased several interlayers causes the light loss of interface generation.This polaroid is normally made via more complicated stretching processing procedure, and be covered with up and down two-layer base material (TAC film) and one deck optical cement, it has more interface problem than 1/4 wavelength retardation plate, and thickness is thicker, material and processing procedure cost also are difficult for descending, the most important thing is layer with layer between the interface more can cause the decline of penetrability, the function of this optical module is had negative influence.
And for example United States Patent (USP) 5,601, and 884 and 5,743,980, be to disclose a kind ofly to be base material with glass and to make the liquid crystal material of apparatus birefringence and prepare the method for phase delay chip with coating method; In addition, United States Patent (USP) 6,262,788B1 then disclose a kind of on the TAC film coating of liquid crystalline material prepare the method for phase delay chip, the all non-usefulness as the optical transition after the beam split of cholesteric liquid epitaxial of the target of these Prior Arts also is untreated and directly is coated on interface surface problem required on the cholesteric liquid epitaxial.Aspect the preparation of polaroid, United States Patent (USP) 6,049,428 disclose a kind of technology of finishing new-type E-type polaroid with coating disk column dimeric molecule (supermolecular), its penetrating shaft is different with the O-type polaroid of traditional perpendicular molecules optical axis for being parallel to the molecule optical axis, but it still is a kind of extinction type light polarizing film basically, the brightness enhancement function that it does not possess the conversion of light polar biased attitude, light reclaim mechanism and is caused.
Summary of the invention
A fundamental purpose of the present invention is to provide a kind of high-penetration type blast optical module, comprise the cholesteric liquid crystal phase film and the 1/4 wavelength retardation films that are formed in regular turn on the base material, preferable further comprising is formed on a light polarizing film of this 1/4 wavelength retardation films.This cholesteric liquid crystal phase film and 1/4 wavelength retardation films are to be formed by coating method, and this light polarizing film is formed by the coating method or the mode of a preformed light polarizing film on this 1/4 wavelength retardation films of fitting, and is preferable with coating method.High-penetration type blast optical module of the present invention with light polarizing film combines with the backlight liquid crystal display module, can make the brightness enhancement mode polarization light source of LCD.
According to the technology of the present invention, can provide a kind of thickness ultra-thin, integrated polarized film/optical film, its each optical function interlayer has lacked the applying interface and the optical cement of substrate/layer/layer, places on LCD backlight, just can reduce absorption or scattering, make that also penetrability increases relatively light.Simultaneously provide cheaply directly coating method and make integrated polarized film/optical film of the present invention according to one of method of the technology of the present invention, it can finish the coating of cholesteric liquid crystal phase film, 1/4 wavelength retardation films and light polarizing film on single coating machine platform, requiredly film the raw material consumption seldom, and only need single base material to get final product, so can save the program of material cost and applying, the reduction of cost, the minimizing of production resource requirement are had obvious help.
Embodiment
The present invention discloses and a kind ofly finishes the optical module that comprise cholesteric liquid crystal phase film, 1/4 wavelength retardation films and polarizing film according to the coating sequencing with direct coating method on single base material, is applied to general backlight LCD and goes up as blast mechanism.
This coating method can directly be carried out at the single base material of optical-grade transparent base material by the mode of plsitive mold or scraper coating, and this optical-grade transparent base material can be as TAC, PET, PS or polyacrylate.The coating sequencing of cholesteric liquid crystal phase film, 1/4 wavelength retardation films and polarizing film can not change (unique) simultaneously, changes or subtract one item missing then can't produce blast mechanism arbitrarily.At first in the processing procedure of coating, promptly must give the specific optical axis of each film in the assembly: as the cholesteric liquid crystal phase film, need allow its optical axis perpendicular to coated face, just its superiors and undermost molecules align direction will be parallel to the base material alignment direction, and molecule is therebetween arranged in the shape of a spiral, so just has the function of unpolarized incident light being separated circularly polarized light.This cholesteric liquid crystal phase film generally can be the structure of single or multiple lift.For reaching the full light of visible light territory brightening effect, cholesteric liquid crystal phase film of the present invention need have the pitch that varies in size in its layer thickness direction, and the pitch size has by big and little or by little and big continuous or discrete variation.
1/4 wavelength retardation films of assembly need allow its optical axis be parallel to coated face for another example, and just the molecules align direction will be parallel to the base material alignment direction, has incident wavelength is postponed to be 0.25 times of function; Coat on the cholesteric liquid crystal phase film, have the circularly polarized light of changing out by the cholesteric liquid crystal phase film, transfer the function of linearly polarized photon again to.
The polarizing film of optical module of the present invention, optical axis is parallel to coated face, and has mutually perpendicular penetrating shaft and absorption axes, unpolarized incident light can be converted to the function of linearly polarized light; During with above-mentioned both films collocation, pay special attention to its optical axis included angle and need differ from 45 degree mutually with realization optical function separately with 1/4 wavelength retardation films.This polarizing film in the time of can adopting penetrating shaft to can be the O-type polaroid of perpendicular molecules optical axis arbitrarily, or is parallel to the E-type polaroid of molecule optical axis.Setting up of this polarizing film preferablely formed by rubbing method, but also can be formed via the mode of a preformed light polarizing film on this 1/4 wavelength retardation films of fitting.
Reach above specific optical axis, except that this cholesteric liquid crystal phase film, all membraneous materials that the present invention adopts are compound or the potpourri that contains liquid crystal characteristic, particularly polymerisable nematic liquid crystal.Wherein have the dichroic dye of liquid crystal characteristic or be formula components with the dichroic dye raw material in the optional usefulness of polarizing film part.
Description of drawings
Fig. 1 shows that a kind of blast optical module of finishing according to embodiments of the invention 1 is parallel to each other and vertical spectrophotometric result with a polaroid, and wherein transverse axis is a wavelength, and the longitudinal axis is penetration (T%).
Fig. 2 shows the comparison of a kind of blast optical module of finishing according to embodiments of the invention 1 and the penetration (T%) of the blast optical module of Prior Art, and wherein thick line is the embodiment of the invention 1, reaches the blast optical module of representing Prior Art than fine rule.
Embodiment
Embodiment 1
Polymerisable cholesterol liquid crystal SLM90032 and SLM90034 are with SLM90032: SLM90034=70: 30 ratios and toluene (Toluene) are made into the solution of 25wt%, and the UV light that adds 1wt% simultaneously rises and makes agent Irgacure907
(Ciba Geigy) then is coated on the thickness 50 μ m PET films of the processing of orientation, uses 100W/cm with 80 ℃ of oven dry after 2 minutes
2UV light irradiation film forming after 20 seconds, at last the cholesteric liquid crystal phase film of the about 5 μ m of thickness.
Polymerizable liquid-crvstalline SLM90519 and toluene (Toluene) are made into the solution of 10wt%, and the UV light that adds 1wt% simultaneously rises and makes agent Irgacure907
On above-mentioned cholesteric liquid crystal phase film, coat this solution, use 100W/cm after 1 minute 80 ℃ of oven dry
2The UV light irradiation form the film of 2 μ m thickness after 20 seconds, so just finish the part of 1/4 wavelength retardation plate in the blast optical module.
The blast optical module of making in the above described manner, thickness are only about 57 μ m.Fig. 1 shows that the blast optical module of finishing according to embodiments of the invention 1 is parallel to each other and vertical spectrogram with a polaroid, and wherein transverse axis is a wavelength, and the longitudinal axis is penetration (T%).
Comparative example
With the thick cholesteric liquid crystal phase film of 5 μ m that embodiment 1 is finished, the 100 commercially available μ m1/4 wavelength retardation plates of directly fitting, the blast optical module of making in the above described manner is about the about 155 μ m of thickness.Fig. 2 penetrates spectrogram relatively for both.Wherein thick line is represented the embodiment of the invention 1, and represents blast optical module prepared in the comparative example of Prior Art than fine rule.Clearly, the penetration of blast optical module of the present invention as can be seen from Figure 2 is higher.
Embodiment 2
The blast optical module that uses embodiment 1 to prepare is integrated with the blast optical module of a light polarizing film.Confirm the optical axis direction of above-mentioned 1/4 wavelength retardation plate earlier, direction at its optical axis included angle 45 degree is coated following solution: be made into the solution of 20wt% with polymerizable liquid-crvstalline SLM90519 and toluene (Toluene), the UV light that adds 1wt% simultaneously rises and makes agent Irgacure907
With 3wt% black dichroic dye (dichroic dye).Use 100W/cm through 80 ℃ of oven dry after 2 minutes
2The UV light irradiation form the film of 2 μ m thickness after 1 minute, this is the part of the polaroid in the blast optical module.
The blast optical module of making in the above described manner, thickness only about 59 μ m, are placed on the characteristic that has possessed blast and high-penetration degree on the backlight LCD.
Claims (7)
1. full coated high pentration type brightening optical module that is applicable to LCD, comprise the cholesteric liquid crystal phase film and the 1/4 wavelength retardation films that are formed in regular turn on the base material, this cholesteric liquid crystal phase film and 1/4 wavelength retardation films are to be formed by coating method; Wherein this base material is directly to contact with this cholesteric liquid crystal phase film, and does not have an applying glue therebetween; Reaching this cholesteric liquid crystal phase film is directly to contact with this 1/4 wavelength retardation films, and does not have an applying glue therebetween; Wherein this cholesteric liquid crystal phase film adds a unpolarized incident light and gives circular polarization, and this 1/4 wavelength retardation films has 0.25 times of circular polarization light wavelength that an optical delay equals the reflection of this cholesteric liquid crystal phase film, so, can convert this unpolarized incident light to linearly polarized light when the circularly polarized light of this reflection is reflected when entering this cholesteric liquid crystal phase film;
On this 1/4 wavelength retardation films a light polarizing film that is formed by coating method is arranged, this 1/4 wavelength retardation films is directly to contact with this light polarizing film, and does not have an applying glue therebetween;
Wherein this 1/4 wavelength retardation films comprises a liquid-crystal compounds, and this liquid-crystal compounds has a part spiral, and the optical axis of this molecular spiral is parallel to this 1/4 wavelength retardation films.
2. optical module as claimed in claim 1, wherein this base material is a transparent optical classes and grades in school base material.
3. optical module as claimed in claim 1, wherein the cholesteric liquid crystal phase of this cholesteric liquid crystal phase film has a part spiral, the optical axis of this molecular spiral is perpendicular to this cholesteric liquid crystal phase film, its the superiors and undermost molecules align direction are parallel to the alignment direction of base material, give circular polarization so a unpolarized incident light can be added, wherein this cholesteric liquid crystal phase film can be the cholesteric liquid crystal phase macromolecule of single or multiple lift.
4. optical module as claimed in claim 1, wherein this light polarizing film comprises a liquid-crystal compounds, this liquid-crystal compounds has a part spiral, and wherein the optical axis of the molecular spiral of the liquid-crystal compounds of the optical axis of the molecular spiral of the liquid-crystal compounds of this light polarizing film and this 1/4 wavelength retardation films differs from 45 degree mutually.
5. optical module as claimed in claim 3, wherein the molecular spiral of this cholesteric liquid crystal phase has the pitch that varies in size, and the pitch size has by big and little or by little and big continuous or discrete variation.
6. optical module as claimed in claim 4, wherein this light polarizing film its be to have the O-type light polarizing film of a penetrating shaft perpendicular to the optical axis of this molecular spiral, or for having an E-type light polarizing film that a penetrating shaft is parallel to the optical axis of this molecular spiral.
7. optical module as claimed in claim 1, wherein this light polarizing film is that iodine system or dichroic dye are light polarizing film.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2005100682887A CN1858641B (en) | 2005-05-08 | 2005-05-08 | Full coated high penetration type brightening optical module suitable for liquid crystal display |
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| CN2005100682887A CN1858641B (en) | 2005-05-08 | 2005-05-08 | Full coated high penetration type brightening optical module suitable for liquid crystal display |
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| CN1858641B true CN1858641B (en) | 2011-03-30 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101311796B (en) * | 2007-05-25 | 2010-06-23 | 台湾薄膜电晶体液晶显示器产业协会 | Reflecting type optical film preparation method and reflecting type polarizing film and method of manufacture |
| CN101639572B (en) * | 2008-07-29 | 2013-08-14 | 深圳Tcl新技术有限公司 | Polarized glasses and stereoscopic display system adopting polarized glasses |
| CN102289022A (en) * | 2011-09-05 | 2011-12-21 | 青岛海信电器股份有限公司 | Brightness raising film, preparing method and application of same |
| CN103364992B (en) * | 2013-07-09 | 2014-11-26 | 李明伟 | Reflection polarization brightness enhancement film and manufacturing method thereof |
| TW201508347A (en) * | 2013-08-20 | 2015-03-01 | Sumika Technology Co Ltd | Method for producing patterned retardation polarizer and application thereof |
| CN105223138B (en) * | 2014-06-05 | 2018-01-30 | 联合大学 | Gas sensing unit, gas detecting system and gas detection method |
| CN104793281B (en) * | 2015-05-13 | 2019-02-19 | 京东方科技集团股份有限公司 | A kind of display device, curved face display panel, built-in polaroid and preparation method thereof |
| TWM532656U (en) | 2016-08-09 | 2016-11-21 | 揚昇照明股份有限公司 | Touch organic light-emitting diode display device and touch device |
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