CN101086606A - System for promoting microdisplay optical engine contrast - Google Patents

System for promoting microdisplay optical engine contrast Download PDF

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Publication number
CN101086606A
CN101086606A CN 200610035840 CN200610035840A CN101086606A CN 101086606 A CN101086606 A CN 101086606A CN 200610035840 CN200610035840 CN 200610035840 CN 200610035840 A CN200610035840 A CN 200610035840A CN 101086606 A CN101086606 A CN 101086606A
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China
Prior art keywords
light
image
illumination
polaroid
optical
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Granted
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CN 200610035840
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Chinese (zh)
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CN100487563C (en
Inventor
樊思民
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Shenzhen Acto Digital Video Technology Co Ltd
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Shenzhen Acto Digital Video Technology Co Ltd
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Priority to CNB2006100358407A priority Critical patent/CN100487563C/en
Publication of CN101086606A publication Critical patent/CN101086606A/en
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Publication of CN100487563C publication Critical patent/CN100487563C/en
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  • Projection Apparatus (AREA)

Abstract

The invention relates to the optical engine projection display for LCD, LCOS, DLP.LCD, LCOS panel used as optical valve can not shut off of front or oblique incidence completely and will affect the image comparison degree. Although DMD chip can turn off all the incidence light, improves image comparison ratio, it can not improve the evenness of the image. It comprises the polarization illumination, polarization weakening part, color combining and splitting part, and the projection display part. The illumination part can change the natural light into part of the polarized light whose damping part composed of linear polarized plate and the mechanical structure to form the optical shaft rotation system, through the rotation of the linear polarized plate to control the flow of the incidence light and to improve the comparison ratio of the dark image. It is simple, easy to control and easy to realize mass production.

Description

A kind of novel system that improves the micro-display light engine contrast
Affiliated technical field
The invention belongs to micro-display light engine field of projection display, particularly LCD, LCOS, DLP light engine field of projection display.
Background technology
Microdisplay optical engine is widely used in fields such as teaching, government bodies, enterprise, family, movie theatre.Along with the development of times people have higher requirement to the display effect of little Display projector machine: brightness is higher, color is more gorgeous, more can show the slight level of scene.Microdisplay optical engine, also as the image source of whole optical projection system, by the illumination of illuminator, is imaged onto on the reception screen by optical projection system as optical modulation device with little display panel.LCD, LCOS Panel utilize the percent of pass of the different control of the rotational angle light of liquid crystal molecule under the different voltage effects, can not turn off normal incidence/oblique incident ray fully as light valve, have part light infiltrate, influence the contrast of image; DMD chip is made up of some micro-reflectors, controls passing through of light by the on off state of control micro-reflector, though can turn off all incident lights, has improved the contrast of image, and the uniformity coefficient of image can't improve simultaneously.The method that improves at present picture contrast mainly contains two kinds: luminous energy throughput when utilizing dynamic aperture control to show dim image; The 2nd, by the gamma curve of circuit, dim image also can be shown with full GTG according to the bright dark kinetic-control system of image.Preceding a kind of method relative complex, a kind of method in back can not fundamentally improve the contrast of image.
Summary of the invention
The present invention partly is made up of polarizing illumination part, polarisation decay part, color splitting and mixing part and Projection Display.Illumination section is transformed into partial poolarized light by the natural light that PCS (Polarization conversion system) sends the lamp source, the polarization fading part is made up of around the optical axis rotary system linear polarizer and physical construction, the throughput of the Spin Control incident polarized light by linear polarizer improves the contrast of dim image.The present invention is simple in structure, is easy to control, is easy to realize mass production.
Accompanying drawing is briefly described
Fig. 1 is the polarizing illumination index path.
Fig. 2 is polarized light decay part schematic diagram.
Fig. 3 is first embodiment of the present invention.
Fig. 4 is second embodiment of the present invention.
Embodiment
Fig. 1 is the polarizing illumination index path.The light that is sent by parabolic lamp source 101 among the figure a converges on the PBS film of PCS 104 through first fly's-eye lens 102, second fly's-eye lens 103, the P ripple changes the S ripple through the PBS film into by 1/2 wave plate and enters illuminating lens, and the S ripple enters illuminating lens 105,107 through the reflection of PCS reflectance coating again by the reflection of PBS film.The natural light that is sent by light source 101 changes partial poolarized light into through PCS 104; The light that is sent by ellipsoid lamp source 101 among the figure b enters PCS 104 by light pipe 109 even light through collimation lens 110 collimations; The P ripple that sees through the PBS film changes the S ripple into through 1/2 wave plate, and the S ripple enters illuminating lens 105,107 through the reflection of PBS and prismatic reflection face.108 hot spots for illuminator formation.The light that is sent by parabola or ellipsoid lamp source 101 becomes partial poolarized light through PCS 104.On the cross section of the vertical light direction of propagation, the light vibration of a certain direction is the strongest, and other direction is the most weak.When bright dark variation can appear in polaroid 106 transmitted ray when optical axis rotates.
Fig. 2 is polarized light decay part schematic diagram.211 is the light transmission shaft of polaroid 206, and 212 is incident polarized light electric vector E direction of vibration, E x, E yFor E at polaroid light transmission shaft and the axial component of vertical light transmission.θ is the angle of E and light transmission shaft.The light that sees through polaroid 211 is by the decision of (1) formula, and the direction of propagation of light is outside by paper.
E x＝Ecos(θ) (1)
When polaroid 211 rotation, along with the variation of angle θ, the amplitude of output light is cosine function to be changed, and according to the corner of the bright dark variation control polaroid of image, just can reach the purpose of raising picture contrast.
Fig. 3 is first embodiment of the present invention.From the partial poolarized light of PCS 304 outgoing, form the illumination hot spot by illuminating lens 305,307,317,318,320 and be divided into the red, green, blue three coloured light LCD Panels 308 that throws light on respectively by dichroic filter 313,315.306 is polaroid, and around optical axis rotation, the light percent of pass is the highest when the light transmission shaft of polaroid and S ripple overlap, and the light percent of pass is minimum when the polaroid half-twist.The light percent of pass changes by the cosine square rule between minimum and maximum.According to the angle of the moving polaroid of the bright blackout of projected image, improved the contrast of dark image.319,321,324 is catoptron, and 314,316,322,323,325,326 is polaroid, and 327 is X-Cube, and 328,329 is 327 dichroic coating.330 is projection lens.
Fig. 4 is second embodiment of the present invention.The light that is sent by ellipsoid light source 401 enters light pipe 409 even light, is entered among the PCS404 by collimation lens 410 collimations, and emergent light is S.Polaroid 406 is around optical axis rotation, and the light percent of pass is the highest when light transmission shaft and S ripple overlap, and the light percent of pass is minimum when the polaroid half-twist, and the light percent of pass changes by the cosine square rule between minimum and maximum.408 is LCOS Panel, and 431 is the PBS prism, 432 be colour wheel to the beam split of incident light sequential, timesharing illumination LCOS Panel.According to the angle of the moving polaroid 406 of the bright blackout of projected image, improve the contrast of dark image.

Claims (7)

1. the novel system that improves the micro-display light engine contrast comprises polarized illumination system, polarized light attenuation factor and optical projection system.
As the described polarized illumination of right 1 system to little display panel illumination.
3. the image imaging that little display panel is produced as right 1 described optical projection system is to receiving on the screen.
As right 1 described polarized light attenuation factor in the polarized illumination system with receive between the screen.
5. form by polaroid and rotating mechanism as right 4 described polarized light attenuation factors.
6. polaroid surface normal as claimed in claim 5 and illuminator optical axis included angle are less than 30 °.
As right 6 described polaroids around the rotation of self axis of symmetry.
CNB2006100358407A 2006-06-05 2006-06-05 System for promoting microdisplay optical engine contrast Expired - Fee Related CN100487563C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CNB2006100358407A CN100487563C (en) 2006-06-05 2006-06-05 System for promoting microdisplay optical engine contrast

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNB2006100358407A CN100487563C (en) 2006-06-05 2006-06-05 System for promoting microdisplay optical engine contrast

Publications (2)

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CN101086606A true CN101086606A (en) 2007-12-12
CN100487563C CN100487563C (en) 2009-05-13

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102200677A (en) * 2010-03-23 2011-09-28 精工爱普生株式会社 Projector
CN104516181A (en) * 2014-12-17 2015-04-15 广东威创视讯科技股份有限公司 Lighting system, projector and back projection system
CN104516182A (en) * 2014-12-17 2015-04-15 广东威创视讯科技股份有限公司 Lighting system, projector and back projection system
CN106814454A (en) * 2015-12-02 2017-06-09 李光辉 A kind of intelligent glasses of adjustable contrast
CN113741132A (en) * 2017-07-06 2021-12-03 深圳光峰科技股份有限公司 Projector control system and control method

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102200677A (en) * 2010-03-23 2011-09-28 精工爱普生株式会社 Projector
CN104516181A (en) * 2014-12-17 2015-04-15 广东威创视讯科技股份有限公司 Lighting system, projector and back projection system
CN104516182A (en) * 2014-12-17 2015-04-15 广东威创视讯科技股份有限公司 Lighting system, projector and back projection system
CN104516182B (en) * 2014-12-17 2016-05-25 广东威创视讯科技股份有限公司 A kind of illuminator, projector and back-projection system
CN106814454A (en) * 2015-12-02 2017-06-09 李光辉 A kind of intelligent glasses of adjustable contrast
CN113741132A (en) * 2017-07-06 2021-12-03 深圳光峰科技股份有限公司 Projector control system and control method
CN113741132B (en) * 2017-07-06 2024-02-02 深圳光峰科技股份有限公司 Projector control system and control method

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