CN101614946A - Compact optical engine system based on micro display chip - Google Patents
Compact optical engine system based on micro display chip Download PDFInfo
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- CN101614946A CN101614946A CN200910304261A CN200910304261A CN101614946A CN 101614946 A CN101614946 A CN 101614946A CN 200910304261 A CN200910304261 A CN 200910304261A CN 200910304261 A CN200910304261 A CN 200910304261A CN 101614946 A CN101614946 A CN 101614946A
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Abstract
The present invention relates to a kind of compact optical engine system based on micro display chip.Comprise light source, relaying imaging system, micro display chip and projection imaging object lens, light source is no optics shaping light source, the exit direction of this light source is provided with an optical tunnel, the incident end face of described optical tunnel is more than or equal to its outgoing end face, outgoing end face one side of optical tunnel is provided with the relaying imaging system, the enlargement ratio of relaying imaging system is 3-10 times, and the light path of relaying imaging system rear side is provided with micro display chip, and the exiting surface of micro display chip is corresponding with projection objective.Characteristics such as it is simple in structure, compact, small and exquisite, easy for installation that the present invention has, and manufacturing process is simple.
Description
Technical field
The present invention relates to a kind of optical engine system, especially relate to a kind of compact optical engine system based on micro display chip.
Background technology
It is early stage that shadow casting technique rose in for 19th century, is to promote on the invention of last 20 beginning of the century films and popular basis in 19 generation to come.At present, the appearance based on the projection display technique of micro display chip makes miniaturization and high resolving power Projection Display become possibility.Based on the projection display technique of micro display chip is to be to be projected on the screen after the image that micro display chip produced of 0.45-1.3 inch amplifies with Diagonal Dimension.It combines optics and ripe semiconductor technology, is the approach that the high realization large scale high-resolution of a kind of cost performance shows.Micro display chip is the core component of high definition Projection Display, can be used for giant-screen high definition rear-projection TV, high-definition liquid crystal and digital projection instrument.Present optical projection system has comprised that light source is arranged, reflector, and optical tunnel, relay lens group is closed photosystem, elements such as projection objective and compound eye.
As application number is means of illumination and the assembly that the patent of invention of CN200610023710.1 discloses a kind of combined dodging, color separation, belongs to illumination technique for displaying field.The visible light that this method is sent light source enters the combined color separation assembly of being made up of colour splitting prism, reflecting prism, lamp guide behind the even light of incident lamp guide, from three the uniform ruddiness of outgoing lamp guide exit facets difference outgoing, green glow and blue lights.The present invention has the following advantages: adopt combined dodging and color separation method, the integrated level height; High light transmissioning efficiency and branch colour efficiency; Dichroic coating and reflectance coating plated film difficulty are little; The modular construction compactness, volume is little.Assembly by this method work is suitable in Projection Display such as LCD, DLP, LCOS as the even light in the illuminator, color separation assembly.
Application number is that 200480038649.7 patent of invention discloses and a kind ofly is used for the optical element of uniform irradiation and has the optical system of this element, is used for the optical element of even light and the optical system with this optical element.This optical element comprises the optical wand with input face and output face.The input face of this optical element is not parallel to the output face of optical element.
Application number is that the patent of invention of CN200510007563.4 discloses and a kind ofly can obtain the manufacture method of the big light supply apparatus of the degree of freedom of even light and design, this light supply apparatus efficiently and have the projector of this light supply apparatus with midget plant.This light supply apparatus has the solid luminescence chip of supply as the light G in presetted wavelength zone; Constitute the bearing of the solid luminescence chip support of support solids luminescence chip; Encapsulating mould; Heating radiator; Make the reflection of G light and the photoconduction of directive illumination direction IL and the bearing that the photoconduction support of photoconduction is supported in conduct; The exit facet of solid luminescence chip and the plane of incidence of photoconduction are provided with across predetermined interval H.
In illuminator owing to adopted reflector, compound eye multiple optical elements such as (perhaps optical wands) to carry out beam shaping, the system architecture complexity.The light beam that enters optical wand simultaneously in the existing system all is that its angle of incidence of light is less through the light beam after reflector or the aspheric surface shaping, thereby needs long optical wand to obtain even light distribution at the optical wand exit end.Inconvenience is installed by the above factor system that makes, size is bigger, and manufacturing cost is higher, is unfavorable for miniaturization Design, batch and the large-scale production of projecting optical engine.
Summary of the invention
The present invention mainly be solve that existing in prior technology installs that inconvenience, size are big, the technical matters of manufacturing process complexity etc., provide a kind of simple in structure, compact, small and exquisite, easy for installation, manufacturing process is simply based on the compact optical engine system of micro display chip.
Above-mentioned technical matters of the present invention is mainly solved by following technical proposals: a kind of compact optical engine system based on micro display chip, comprise light source, the relaying imaging system, micro display chip and projection imaging object lens, it is characterized in that described light source is no optics shaping light source, the exit direction of this light source is provided with an optical tunnel, the incident end face of described optical tunnel is more than or equal to its outgoing end face, outgoing end face one side of optical tunnel is provided with the relaying imaging system, the enlargement ratio of relaying imaging system is 3-10 times, the light path of relaying imaging system rear side is provided with micro display chip, the signal input part of micro display chip and control module and screen and/or image storage system link to each other, and the exiting surface of micro display chip is corresponding with projection objective.No optics shaping light source can be LED, UHP lamp, Halogen lamp LED, LASER Light Source, just can not obtain unidirectional parallel beam owing to it does not need to carry out optical shaping, so have space-saving effect.The enlargement ratio of traditional relaying imaging system is 1, so do not have the effect of adjusting beam angle, therefore the beam shaping that need send light source by optical devices,, obtaining parallel or approximately parallel light, and spare light by an optical tunnel, because the optic angle degree of incident optical tunnel is less, reach uniform outgoing end face, the length of optical wand is longer, so its physical dimension is bigger.The light beam that the angle that the light source of the technical program sends is very big directly enters optical wand, because the incident beam angle is big, light beam in short optical wand mixed light just can take place repeatedly to reflect, and forms equally distributed illumination at optical wand outgoing end face; Because the enlargement ratio of this relaying imaging system is 3-10, so the step of optical shaping is finished in the relaying imaging system, the even illumination of optical wand outgoing end face on micro display chip, also can be satisfied the requirement of micro display chip glazed thread incident angle through relaying imaging system amplification imaging simultaneously.Projection imaging was on screen after image on the micro display chip passed through the projection thing again.Optical tunnel need not be born the function of adjusting beam angle, so the incident end face of optical tunnel is more than or equal to its outgoing end face.The light beam that light source sends directly is coupled in the strip optical wand, and coupling efficiency reaches more than 98%.Light beam has been eliminated the defective that light source self may have fully through repeatedly promptly forming uniform illumination hot spot at the outgoing end face behind the even light of reflection in the optical wand of shorter length.Micro display chip 5 can be a transmission-type, also can be reflective, common micro display chip as LCOS, LCD, TFT and DLP etc.
As preferably, bright dipping one side of described light source is adjacent to mutually or imbeds in the optical wand with optical tunnel.Light source bright dipping one side can be connected in the end face of optical tunnel, also can be located at optical tunnel inside, from the optical tunnel left side less than the 5mm place.The step of optical shaping is finished in the relaying imaging system, and optical tunnel need not be born the function of adjusting beam angle, so both can link to each other, and without any influence, its final effect is that structure is more compact.
As preferably, has a spacing between bright dipping one side of described light source and the optical tunnel less than 5mm.The step of optical shaping is finished in the relaying imaging system, and optical tunnel need not be born the function of optically focused, and optical tunnel need not be born the function of optically focused, so both are nearer from getting, and without any influence, its final effect is that structure is more compact.
As preferably, the xsect of described optical tunnel is apart from shape or regular polygon, and optical tunnel is solid or hollow-core construction.Optical wand can be solid also can be hollow, the solid light bar material can be optical materials such as glass or plastics, hollow optical wand can be by electroplating or technology such as plated film realizes total reflection in the optical wand.All retes can adopt the method for electron beam evaporation to be coated with, and utilize the light-operated method that combines with the quartz crystal oscillating phase to carry out thicknesses of layers control.
As preferably, has a spacing between bright dipping one side of described light source and the optical tunnel less than 5mm.
As preferably, the xsect of described optical tunnel is rectangle or regular polygon, and optical tunnel is solid or hollow-core construction.The solid construction of optical tunnel is a kind of common structure, hollow-core construction then is that the present invention is distinctive, because the step of optical shaping is finished,, all can reach the effect of even light so hollow-core construction is the same with the action effect of solid construction in the relaying imaging system.
As preferably, the left side lens of described relaying imaging system and optical tunnel exit facet have a spacing less than 5mm, and the face that these lens are relative with optical tunnel is cambered surface or plane.
As preferably, the left side lens and the optical tunnel of described relaying imaging system are connected as a single entity, and the face that these lens link to each other with optical tunnel is the plane.Above-mentioned two kinds of technical schemes all are the design proposals that just can reach on the basis of this unidirectional source of parallel light, make structure more compact, and small product size is littler.
As preferably, described micro display chip is LCD or the TFT or the LCOS of transmission-type.When adopting the micro display chip of transmission-type, it is simple in structure, and light path design is also very convenient.
As preferably, light path between described relaying imaging system and the micro display chip is provided with PBS prism or TIR mirror group, described micro display chip is reflective LCOS or DLP, when adopting reflective LCOS, light path between relaying imaging system and the micro display chip is provided with the PBS prism, when adopting reflective DLP, the light path between relaying imaging system and the micro display chip is provided with TIR prism group.The PBS prism can be so that light path generation corner reaches the more compact effect of product structure.
As preferably, light path between described relaying imaging system and the micro display chip is provided with one three look beam splitting system, the light of three kinds of colors is injected three different micro display chips respectively by a folding filter system, and the terminal point of the reflected light path of three micro display chips is a projection objective.White light is divided into red, green, blue three coloured light through beam splitting system and shines three achromaticity type micro display chips respectively by the folding filter system, and ECDC colour system integration becomes colour image projection to screen again.
As preferably, the light path of described relaying imaging system is provided with polaroid or quarter wave plate and reflecting polarizer or optical filter.Improvement is by based on the contrast of the micro projector of the compact optical engine system of micro display chip and color indication range etc.
The beneficial effect that brings of the present invention is, the light beam that light source sends directly is coupled into optical wand without orthopaedic component, and is simple in structure, the coupling efficiency height, and optical wand length is shorter simultaneously; Optical wand can adopt strip to replace traditional taper, and processing is simple, and the exit end surface uniformity is good, the system architecture compact and reasonable.Optical wand can adopt gradually little formula cone structure, and even photosensitiveness is good, the coupling efficiency height.In order to improve the efficiency of light energy utilization of system, among the present invention relaying imaging illuminator require to have higher N.A value. and certain enlargement ratio (as 3-10 times).Compare with present technology.Should be based on the compact projecting optical engine of micro display chip, it is little to have a volume, high brightness, high-contrast, the characteristics of high definition, the illumination path statement of account simultaneously, cost of manufacture is low, and size is little, and is easy to assembly, is convenient to large-scale production.
Characteristics such as therefore, it is simple in structure, compact, small and exquisite, easy for installation that the present invention has, and manufacturing process is simple.
Description of drawings
Accompanying drawing 1 is a kind of structural representation of the present invention;
Accompanying drawing 2 is a kind of structural representations of the present invention;
Accompanying drawing 3 is a kind of structural representations of the present invention;
Accompanying drawing 4 is a kind of structural representations of the present invention;
Accompanying drawing 5 is a kind of structural representations of the present invention.
Embodiment
Below by embodiment, and in conjunction with the accompanying drawings, technical scheme of the present invention is described in further detail.
Fig. 1 shows the compact projecting optical engine system based on the transmission-type micro display chip.Along the light ray propagation direction, comprised light source 1, optical tunnel 2, relaying imaging system 3, micro display chip 5, micro display chip wherein can be the LCD of transmission-type, TFT or LCOS micro display chip and projection objective 6. light sources 1 can adopt LED, UHP, Halogen lamp LED or other light sources.Optical wand 2 strip-like design, face size designs according to the size of light source size and micro display chip, adopts optical materials such as glass or plastics.The left side lens and the optical tunnel of described relaying imaging system are connected as a single entity, and the face that these lens link to each other with optical tunnel is the plane.Optical wand 2 can be solid also can hollow, can be for the optical wand of hollow by electroplating or the mode of plated film increase the reflectivity of optical wand inside surface.In the instantiation shown in Figure 1, the light that lighting source 1 sends forms a homogeneous light emitting area at optical wand 2 outgoing end faces after sparing light through optical wand 2, again through in illuminate transmission-type micro display chip 5 behind the relaying imaging len 3, last projection objective 6 with the image projection that shows on the transmission-type micro display chip 5 on display screen.
As shown in Figure 2 based on the compact optical engine system of micro display chip, its micro display chip is the reflection-type micro display chip, utilize the compact projecting optical engine system of S optical illumination, be disposed with light source 1 along the light ray propagation direction, optical tunnel 2, relaying imaging system 3, PBS prism 4, micro display chip 5, projection objective 6.Light source 1 can adopt LED, UHP, Halogen lamp LED or other light sources.Optical wand 2 strip-like design, face size designs according to the size of light source size and micro display chip, adopts optical materials such as glass or plastics.Optical wand 2 can be solid also can hollow, can be for the optical wand of hollow by electroplating or the mode of plated film increase the reflectivity of optical wand inside surface.Light is injected optical tunnel 2 backs and is formed the outgoing beam of agreeing have the uniform illumination distribution at exit end.Show that as Fig. 3 light through relaying imaging lens group 3, enters PBS prism 4, wherein the S polarized light is imaged on the micro display chip 6 through the homogeneous light emitting area of PBS prism 4 reflections with optical wand 2 outgoing.Become behind the reflection S light on the micro display chip 6 P light transmission PBS prism 5 again through projection objective with the image projection on the micro display chip 6 on screen.
As shown in Figure 3 based on the compact optical engine system of micro display chip, its micro display chip is the reflection-type micro display chip, utilize the compact projecting optical engine system of P optical illumination, be disposed with lighting source 1 along the light ray propagation direction, optical tunnel 2, relaying imaging system 3, PBS prism 4 micro display chips 5, projection objective 6.Light source 1 can adopt LED, UHP, Halogen lamp LED or other light sources.Optical wand 2 strip-like design, face size designs according to the size of light source size and micro display chip, adopts optical materials such as glass or plastics.Optical wand 2 can be solid also can hollow, can be for the optical wand of hollow by electroplating or the mode of plated film increase the reflectivity of optical wand inside surface.Light is injected optical tunnel 2 backs and is formed the outgoing beam of agreeing have the uniform illumination distribution at exit end.Show that as Fig. 5 light through relaying imaging lens group 3, enters PBS prism 4, wherein the P polarized light is imaged on the homogeneous light emitting area of optical wand 2 outgoing on the micro display chip 6 after 4 transmissions of PBS prism.Become behind the reflected P light on the micro display chip 6 S light after PBS prism 5 reflection again through projection objective with the image projection on the micro display chip 6 on screen.
Based on the compact optical engine system of micro display chip, its micro display chip is a reflection-type DLP micro display chip, is disposed with lighting source 1 along the light ray propagation direction as shown in Figure 4, even light optical wand 2, the saturating imaging system 3 of relaying, TIR mirror group 4, DLP projection micro display chip 5, projection objective 6.Light source 1 can adopt LED, UHP, Halogen lamp LED or other light sources.Optical wand 2 strip-like design, face size designs according to the size of light source size and DLP, adopts optical materials such as glass or plastics.Optical wand 2 can be solid also can hollow, can be for the optical wand of hollow by electroplating or the mode of plated film increase the reflectivity of optical wand inside surface.Light is injected optical tunnel 2 backs and is formed the outgoing beam of agreeing have the uniform illumination distribution at exit end.Light process relaying imaging lens group 3, TIR mirror group 4, wherein light is imaged on the homogeneous light emitting area of optical wand 2 outgoing on the little projection micro display chip 5 of DLP after 4 reflections of TIR mirror group.Image on the micro-display chip 5 of DLP projection after illuminating is projected on the screen through projection objective 6 again.
As Fig. 5 as shown in Figure 4 based on the compact optical engine system of micro display chip, its micro display chip can be reflection-type LCOS (DLP) micro display chip, be disposed with lighting source 1 along the light ray propagation direction, even light optical wand 2, relaying imaging system 3, PBS prism 4 (TIR mirror group 4), LCOS (DLP) projection micro display chip 5 and projection objective 6.Light path between relaying imaging system and the micro display chip is provided with one three look beam splitting system, the light of three kinds of colors is injected three different micro display chips respectively by a folding filter colour separation system, and the reflected light path of three micro display chips ECDC colour system system again enters projection objective.Light source 1 can adopt LED, UHP, Halogen lamp LED or other light sources.Optical wand 2 strip-like design, face size designs according to the size of light source size and LCOS (DLP), adopts optical materials such as glass or plastics.Optical wand 2 can be solid also can hollow, can be for the optical wand of hollow by electroplating or the mode of plated film increase the reflectivity of optical wand inside surface.Light is injected optical tunnel 2 backs and is formed the outgoing beam of agreeing have the uniform illumination distribution at exit end.Light is rolled over filter system through relaying imaging lens group 3, three look beam splitting systems, and red, green, blue three coloured light shine three achromaticity type micro display chips 5 respectively, and ECDC colour system integration becomes colour image projection to screen again.
Above embodiment only is the technical characterictic and the exploitativeness of explanation patent of the present invention, and its purpose is to make the person skilled in art can understand content of the present invention and is implemented.Although the present invention is described with reference to specific embodiment, but, these descriptions should be interpreted as a kind of restriction situation, obviously can make various improvement in the disclosed embodiment and other embodiment of the present invention with reference to the above description of this invention for those skilled in the art, therefore, only it is contemplated that otherwise departing from the spirit and scope of the present invention that appended claims limits is to make such improvement, all conversion of having done under this invention's idea include in right of the present invention and want in the art.Scope of the present invention is limited by the equivalent in claim and the whole claim scope.
Claims (10)
1. compact optical engine system based on micro display chip, comprise light source, the relaying imaging system, micro display chip and projection imaging object lens, it is characterized in that described light source is a no optics shaping light source (1), the exit direction of this light source is provided with an optical tunnel (2), the incident end face of described optical tunnel is more than or equal to its outgoing end face, outgoing end face one side of optical tunnel is provided with (having the amplification imaging function) relaying imaging system (3), the enlargement ratio of relaying imaging system is 3-10 times, the light path of relaying imaging system rear side is provided with micro display chip (5), the signal input part of micro display chip and control module and screen and/or image storage system link to each other, and the exiting surface of micro display chip is corresponding with projection objective (6).
2. the compact optical engine system based on micro display chip according to claim 1 is characterized in that bright dipping one side of described light source is adjacent to mutually or imbeds in the optical wand with optical tunnel.
3. the compact optical engine system based on micro display chip according to claim 1 is characterized in that having a spacing less than 5mm between bright dipping one side of described light source and the optical tunnel.
4. according to claim 1 or 2 or 3 described compact optical engine systems based on micro display chip, the xsect that it is characterized in that described optical tunnel is that optical tunnel is solid or hollow-core construction apart from shape or regular polygon.
5. according to claim 1 or 2 or 3 described compact optical engine systems based on micro display chip, the left side lens and the optical tunnel exit facet that it is characterized in that described relaying imaging system have a spacing less than 5mm, and the face that these lens are relative with optical tunnel is plane or cambered surface.
6. according to claim 1 or 2 or 3 described compact optical engine systems based on micro display chip, it is characterized in that the left side lens and the optical tunnel of described relaying imaging system is connected as a single entity, the face that these lens link to each other with optical tunnel is the plane.
7. according to claim 1 or 2 or 3 described compact optical engine systems, it is characterized in that described micro display chip is LCD or the TFT or the LCOS of transmission-type based on micro display chip.
8. according to claim 1 or 2 or 3 described compact optical engine systems based on micro display chip, it is characterized in that the light path between described relaying imaging system and the micro display chip is provided with TIR mirror group, described micro display chip is reflective LCOS or DLP, when adopting reflective LCOS, light path between relaying imaging system and the micro display chip is provided with the PBS prism, when adopting reflective DLP, the light path between relaying imaging system and the micro display chip is provided with TIR prism group.
9. according to claim 1 or 2 or 3 described compact optical engine systems based on micro display chip, it is characterized in that the light path between described relaying imaging system and the micro display chip is provided with one three look beam splitting system, the light of three kinds of colors is injected three different micro display chips respectively by a folding filter system, and the terminal point of the reflected light path of three micro display chips is the projection imaging object lens.
10. according to claim 1 or 2 or 3 described compact optical engine systems, it is characterized in that the light path of described relaying imaging system is provided with polaroid or quarter wave plate and reflecting polarizer or optical filter based on micro display chip.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101915995A (en) * | 2010-07-26 | 2010-12-15 | 杭州晶景光电有限公司 | Optical projection system capable of evenly lightening on basis of total internal reflection lens |
| CN102169234A (en) * | 2011-04-30 | 2011-08-31 | 成都光升科技有限公司 | LCOS (Liquid Crystal On Silicon) micro projector optical system adopting LED (Light Emitting Diode) illumination with RGB (Red Green And Blue) form |
| CN102207661A (en) * | 2010-03-29 | 2011-10-05 | 影来腾贸易(上海)有限公司 | Projection type light-uniforming system for touch screen |
| CN102231010A (en) * | 2011-06-15 | 2011-11-02 | 杭州晶景光电有限公司 | Wide area light source shaping system for micro projection optical engine |
| CN103852897A (en) * | 2014-03-20 | 2014-06-11 | 浙江晶景光电有限公司 | Micro optical engine system based on reuse of polarized light |
| CN110690925A (en) * | 2018-07-05 | 2020-01-14 | 上海瑞波电子科技有限公司 | Compact structure type integral optical engine device |
| WO2023226711A1 (en) * | 2022-05-26 | 2023-11-30 | 宁波舜宇光电信息有限公司 | Micro projection module and head-mounted display device |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100474034C (en) * | 2006-01-24 | 2009-04-01 | 上海飞锐光电科技有限公司 | Combined dodging and color separation lighting method and component |
| JP2007265627A (en) * | 2006-03-27 | 2007-10-11 | Seiko Epson Corp | Lighting system and projector |
| CN100549808C (en) * | 2006-10-25 | 2009-10-14 | 中强光电股份有限公司 | Optical projection system |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102207661A (en) * | 2010-03-29 | 2011-10-05 | 影来腾贸易(上海)有限公司 | Projection type light-uniforming system for touch screen |
| CN101915995A (en) * | 2010-07-26 | 2010-12-15 | 杭州晶景光电有限公司 | Optical projection system capable of evenly lightening on basis of total internal reflection lens |
| CN102169234A (en) * | 2011-04-30 | 2011-08-31 | 成都光升科技有限公司 | LCOS (Liquid Crystal On Silicon) micro projector optical system adopting LED (Light Emitting Diode) illumination with RGB (Red Green And Blue) form |
| CN102231010A (en) * | 2011-06-15 | 2011-11-02 | 杭州晶景光电有限公司 | Wide area light source shaping system for micro projection optical engine |
| CN103852897A (en) * | 2014-03-20 | 2014-06-11 | 浙江晶景光电有限公司 | Micro optical engine system based on reuse of polarized light |
| CN110690925A (en) * | 2018-07-05 | 2020-01-14 | 上海瑞波电子科技有限公司 | Compact structure type integral optical engine device |
| WO2023226711A1 (en) * | 2022-05-26 | 2023-11-30 | 宁波舜宇光电信息有限公司 | Micro projection module and head-mounted display device |
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| CN101614946B (en) | 2011-12-28 |
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Address after: Room a3079, 3rd floor, building 1 (North), 368 Liuhe Road, Binjiang District, Hangzhou City, Zhejiang Province Patentee after: ZHEJIANG CRYSTAL DISPLAY TECHNOLOGY Co.,Ltd. Address before: 310053, Zhejiang, Hangzhou province Binjiang District South Ring Road No. 3738 tax friends building on the first floor East Patentee before: HANGZHOU CRYSTAL DISPLAY TECHNOLOGY Co.,Ltd. |
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Effective date of registration: 20211102 Address after: No. A5, Xingxing electronic industrial zone, Jiaojiang District, Taizhou City, Zhejiang Province Patentee after: ZHEJIANG CRYSTAL-OPTECH Co.,Ltd. Address before: 310059 room a3079, third floor, building 1 (North), No. 368, Liuhe Road, Binjiang District, Hangzhou, Zhejiang Province Patentee before: ZHEJIANG CRYSTAL DISPLAY TECHNOLOGY Co.,Ltd. |