CN101089721A - Front projection display device - Google Patents
Front projection display device Download PDFInfo
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- CN101089721A CN101089721A CN 200610159438 CN200610159438A CN101089721A CN 101089721 A CN101089721 A CN 101089721A CN 200610159438 CN200610159438 CN 200610159438 CN 200610159438 A CN200610159438 A CN 200610159438A CN 101089721 A CN101089721 A CN 101089721A
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Abstract
A display device of front projection-reflection type is prepared as setting a super-thin reflection type of projection optical unit in body-frame, integrating a screen and said body-frame to be a unified body, setting light path center line emitted by said projection optical unit to be includes angle of 5-40degree to image geometric center on display unit in order to let screen to display projected image, fixing screen on reinforced plate and connecting reinforced plate and body-frame to be a unified body through foot base.
Description
[technical field]
The present invention relates to a kind of optical projection system and projection display equipment, relate in particular to a kind of front projection display device.
[background technology]
At present common display is nothing more than the projection display of fixed measure display such as cathode ray tube (CRT) display, LCD (LCD), television indicator and on-fixed size.Family expenses size below 40 cun, far and away with flat-panel screens such as LCD and plasma display panel aspect the market price and the acceptance than the tool advantage.On the other hand, in the time of if image data need being amplified to the zone greatly more than 50 cun, on the one hand, the panel manufacture difficulty of fixed measure flat display apparatus increases, the product yield descends rapidly, therefore operation significantly promotes with manufacturing cost, and the cost of estimating this kind factory reaches 1,000,000,000 dollars approximately, is not that general enterprise can reach easily; And the transportation cost after manufacturing is finished and the spoilage of transportation are also very important.On the contrary, the projection display only need change the size of screen and cabinet, and no matter circuit board or the size of ray machine own all obviously increase, therefore in large-sized demonstration field, still based on the projection display.
And the projection display of prior art comprises the Projection Display terminal of digital display chip technology such as HTPS, DLP, LCOS, its basic structure is by the lamp optical system with the beam direction liquid crystal light valve of light emitted, with will amplify because of the light beam that liquid crystal light valve form image information, the light engine that projects on the screen is formed.
On the structure of projection, be divided into back projection and front projection, back projection has plane mirror, the light beam one or many of imaging is reflected, project on the screen again, light engine, space between catoptron and the screen is closed in the casing of a sealing, and three and electronic circuit board etc. are formed one by structural member.Front projection is that light engine directly projects to the light beam of imaging on the screen, does not link into an integrated entity between light engine and the screen, keeps larger distance.
In actual production and using, because back projection is by increasing the projecting direction that plane mirror changes light path, distance between light engine and screen is furthered, reaching the purpose that realizes all-in-one, but, form certain included angle with screen owing to a bigger plane mirror must be arranged more nearby at screen, vertical to guarantee the projecting light path's center line after the reflection with the plane of screen, cause complete machine thickness thicker, fuselage heaviness, employed screen costliness.
Moreover front projection is the place ahead that light engine is placed on screen, and separates with screen, can not organically combine to be one, and light engine partly lifts trouble or takies desk-top space when using.
[summary of the invention]
At the problem of above-mentioned existence, it is compact more that a purpose of the present invention provides a light channel structure, reaches the front projection projection arrangement of ultra-thin purpose.Thereby the complete machine thickness that solves the back projection structure is thick, the fuselage heaviness, and the screen costliness, front projection light engine and screen can not organically combine and be that one, light engine partly lift trouble or take the problem of desk-top space.
In order to realize the structure of above-mentioned ultra-thin purpose, front projection display device of the present invention comprises, a cabinet and be positioned at a ultra-thin reflection type projection optical device, and the screen of cabinet, and the three forms an integral body.Wherein, the relative screen of imaging beam of ultra-thin reflection type projection optical device outgoing projects on the screen obliquely, and the center line of its imaging beam is incident upon screen center, and and the formed angular range of screen 5 spend to 45 the degree between.
What described ultra-thin reflection type projection optical device, the light engine, that comprises the little apparent imager chip that contains DMD or LCOS or HTPS or light source, a lighting module or color treatments system at least contained aperture comprises a slice comprises a slice plane mirror and nonspherical reflector at least from the non-spherical lens cohort, of the elimination distortion of shaft type non-spherical lens and optical path difference reflector group at least from shaft type sphere imaging len cohort.
The relative screen position of described ultra-thin reflection type projection optical device, for the front lower place of screen, and with the position relative fixed of screen.
Described screen can be the reflectivity screen, and screen surface is distributed with the same micro-structure of sawtooth like, and along the direction of the variable angle of screen and throw light, the size of the micro-structure of every row is all variant.
Described screen can be the reflectivity screen, and its surface distributed has even or non-homogeneous irreflexive structure of generation.
Described screen can be the support that has the screen cover frame around, and screen itself is exactly a stifled wall with reflectance signature, and described device and described wall near.
Described cabinet and described ultra-thin reflection type projection optical device at the joint of its emergent ray, are provided with a mobilizable lid.
Wherein, described lid can be clear glass, comprises the reflectance coating of compensation clear glass aberration on it; Perhaps Huo Dong lid and clear glass exist simultaneously.
The left and right sides fixed sturcture face frame side of described screen is equipped with the audio amplifier of strip, and screen construction face frame and audio amplifier are combined into an integral body.
The left and right sides, described cabinet bottom is equipped with audio amplifier, and described audio amplifier and cabinet form an integral body by frame mode.
Described cabinet is the one-body molded or removable mode of fixedlying connected of mould with the connected mode of screen stiffening plate.
Described screen stiffening plate also can be can crispatura or flexible structural plane or pillar, can be by electronic or manually the screen stiffening plate is rolled or folded up with screen, and place the upper surface of cabinet or be hidden in the cabinet or fold into the cabinet back side.
Can be removable the connection between described reel and the screen stiffening plate.
The pillar that described cabinet is propped and the crossbeam at top can be the loudspeaker casing.
The crossbeam that the upper surface of the post top portion of described screen stiffening plate or plate face top or cabinet increases can be a reel, an axle is arranged in the reel, reel has the width of being longer than screen but the long opening that close reel two ends are not cut open, one edge of screen passes the long opening of reel, fuse with the axle in the reel, the another side of screen in parallel along fix one than the long opening of reel long or diameter spool can act in the reel by manual or electronic or elastic body and to rotate than on the big straight rod of the long A/F of reel.
Other spatial surface of described cabinet can include louvre, interlayer, the drawer of various appearances moulding such as heat dissipation ventilation space and recessed, protruding, arcuation or practicality.
Described screen stiffening plate can be made up of a plate face or the minimum pillar propped from cabinet, screen is fixed on the plate face or lies on the pillar, or increase one or more crossbeam in post top portion or other horizontal level, form I-shaped or square shape or other shape latticed with the cabinet upper surface, screen is fixed thereon.
Each fixes a straight rod the last lower edge of described screen or edge, the left and right sides, and vertical or horizontal stretching screen is fixed on two straight rods on cabinet and the crossbeam or on the pillar of both sides or on the plate face again.
The beneficial effect of front projection display device of the present invention is: wherein, the scope of utilizing light path center line that the light beam of the ultra-thin reflection type projection optical device in the cabinet reflects obliquely and the angle α value at the image geometry center on the display system is that 5 degree to 45 degree project to screen and show that to make its structure compact more, thereby realizes cabinet and screen integration and realization thin type structure; It is too thick that projection display equipment has been avoided back projection complete machine thickness, the fuselage heaviness, use screen costliness, front projection light engine and screen can not organically combine and be that one, light engine partly lift trouble or take the defective of desk-top space, and combine the advantage separately of back projection and front projection, realized that aspheric surface reflection type projection display terminal complete machine is frivolous, cheap, it is convenient to place, purpose elegant in appearance.
[description of drawings]
Fig. 1 is the sectional view of first embodiment of front projection display device;
Fig. 2 is the index path of the ultra-thin reflection type projection optical device of front projection display device;
Fig. 3 is the principle schematic of tooth ladder reflecting surface for the screen of front projection display device;
Fig. 4 is the principle schematic of light non-selectivity ground reflection for the screen of front projection display device;
Constitutional diagram when Fig. 5 does not use for front projection display device.
[embodiment]
Below in conjunction with accompanying drawing the utility model is further detailed structure of the present invention, characteristics and purpose.
As shown in Figure 1, front projection display device of the present invention comprises, a cabinet 5, comprise in the described cabinet 5 that ultra-thin reflection type projection optical device 30, one screens 4 and cabinet 5 are integrated in one, wherein, thin reflection type projection light path 30 emitted light beams in the cabinet 5 project to screen 4 and show.
Ultra-thin as described in Figure 2 reflection type projection optical device 30, it comprises the little apparent imager chip 31 of a DMD or LCOS or HTPS at least, the light engine 32 of color treatments system, one contain aperture from shaft type sphere imaging len cohort 33, one non-spherical lens cohort 34, one reflector group 35, describedly launch will the pass through light engine 32 of color treatments system of each modulated light beam from little apparent imager chip 31, subsequently, through containing aperture from shaft type sphere imaging len cohort 33, veiling glare by aperture filtering edge, then behind a non-spherical lens cohort 34 optically focused, go on the screen 4 by reflector group 35 projections.
Wherein, as Fig. 1, shown in Figure 2, described ultra-thin reflection type projection optical device 30 places and near screen 4 belows (shown in Figure 1) or top (figure is for illustrating), before a described non-spherical reflector group 34 places little apparent imager chip 31, the imaging beam of described little apparent imager chip 31 emissions by contain aperture from shaft type sphere imaging len cohort 33, by non-spherical lens cohort 34 backs more obliquely or oblique reflection down by non-spherical reflector group 35, oblique projection projects beholder 8 again to the surface of screen 4.
The scope of the light path center line that described ultra-thin reflection type projection optical device 30 reflects obliquely and the angle α value at the image geometry center on the screen 4 is that 5 degree are to 45 degree.
Wherein, cabinet 5 can be by being combined into one with screen stiffening plate 7 and screen 4, screen 4 is fixed on the screen stiffening plate 7, thereby makes cabinet 5, and screen stiffening plate 7 is in conjunction with forming complete aspheric surface reflective projection display terminal complete machine, other spatial surface of cabinet 5 is done louvre, heat dissipation ventilation space and recessed, projection, the interlayer of various appearances moulding such as arcuation or practicality, drawer etc.
Described ultra-thin reflection type projection light path 30 is front surface reflection, and its aspherics parameter is by the optical parametric and the distance calculation gained that projects to screen 4 of ray machine 31.
Fig. 3 is the reflectivity screen for the surface of screen 4, and its base material is cloth or other organism, and reflecting surface is made of trickle horizontal tooth ladder, and the tooth ladder skewed surface of every row is corresponding with the projection ray angle, can reflex to the beholder to the light path parallel of oblique projection.
Fig. 4 is the reflectivity screen for the surface of screen 4, and its base material is cloth or other organism, and reflecting surface is stained with and is beneficial to irreflexive material, can make that the picture brightness of screen display is even to the reflection of the light non-selectivity of oblique projection ground.
As shown in Figure 1, the ultra-thin reflection type projection light path 30 of cabinet 5 comprises a separate space 51, and this space opening is in the light avoiding outside cabinet 5, and isolates with other space of cabinet 5, reaches the dustproof purpose.
In order to play better dustproof effect, comprise a mobilizable lid 52 in its separate space 51, as shown in Figure 1, when using, lid 52 is opened, and is unlikely to stop light path; As shown in Figure 5, when not in use, lid 52 is closed, and reaches the dustproof effect; Another kind of situation, this lid 52 can compensate the aberration of clear glass with transparent glass in optical design, and transparent glass surface is coated with reflectance coating, and the lid 52 that light beam penetrates clear glass projects to screen; Perhaps the dustproof lid of Huo Dong lid 52 and clear glass exists simultaneously.
Wherein, cabinet 5 is the one-body molded or removable mode of fixedlying connected of mould with the connected mode of screen stiffening plate 7.
Each fixes a straight rod the last lower edge of screen 4 or edge, the left and right sides, and vertical or horizontal stretching screen 4 makes it fully to flatten and tightens, and is fixed on two straight rods on cabinet 5 and the crossbeam again or on the pillar of both sides or on the plate face.
A crossbeam that increases as the upper surface of the post top portion of screen stiffening plate 7 or plate face top or cabinet 5 can be a reel, an axle is arranged in the reel, reel has the width of being longer than screen 4 but the long opening that close reel two ends are not cut open, one edge of screen 4 passes the long opening of reel, fuse with the axle in the reel, the another side of screen 4 in parallel along fix one grow than the long opening of reel or diameter than on the big straight rod of the long A/F of reel, axle can act in the reel by manual or electronic or elastic body and rotate, when axle rotates, can be involved in screen 4 in the reel collection or a screen 4 that is collected in the reel is discharged use.
Can be removable the connection between reel and the screen stiffening plate 7, after screen 4 was involved in reel, reel can remove from screen stiffening plate 7, or placed the upper surface of cabinet 5 or be hidden in the cabinet 5.
The pillar of propping from cabinet 5 and the crossbeam at top can be the loudspeaker casing, or other surface structure body, perhaps coexistence simultaneously.
Loudspeaker also can be distributed in the cabinet 5.
The beneficial effect of front projection display device of the present invention is: the scope of utilizing light path center line that ultra-thin reflection type projection optical device 30 emitted light beams in the cabinet reflect obliquely and the angle α value at the image geometry center on the display system is that 5 degree to 45 degree project to screen 4 and show that to make its structure compact more, thereby realizes cabinet 5 and screen 4 integration and realization thin type structure; It is too thick that projection display equipment has been avoided back projection complete machine thickness, the fuselage heaviness, use screen costliness, front projection light engine and screen can not organically combine and be that one, light engine partly lift trouble or take the defective of desk-top space, and combine the advantage separately of back projection and front projection, realized that aspheric surface reflection type projection display terminal complete machine is frivolous, cheap, it is convenient to place, purpose elegant in appearance.
The above person only is most preferred embodiment of the present invention, is not to be used to limit the scope of the invention, and all equivalences of being done according to the present patent application claim change or modify, and are all the present invention and contain.
Claims (18)
1, front projection display device comprises, a cabinet and be positioned at a ultra-thin reflection type projection optical device, and the screen of cabinet, and the three forms an integral body.Wherein, the relative screen of imaging beam of ultra-thin reflection type projection optical device outgoing projects on the screen obliquely, and the center line of its imaging beam is incident upon screen center, and and the formed angular range of screen 5 spend to 45 the degree between.
2, front projection display device according to claim 1, it is characterized in that: what described ultra-thin reflection type projection optical device, the light engine, that comprises the little apparent imager chip that contains DMD or LCOS or HTPS and light source, a lighting module and color treatments system at least contained aperture comprises a slice comprises a slice plane mirror and nonspherical reflector at least from the non-spherical lens cohort, of the elimination distortion of shaft type non-spherical lens and optical path difference reflector group at least from shaft type sphere imaging len cohort.
3, front projection display device according to claim 2 is characterized in that: the relative screen position of described ultra-thin reflection type projection optical device, be in the front lower place of screen, and with the position relative fixed of screen.
4, front projection display device according to claim 1, it is characterized in that: described screen can be the reflectivity screen, screen surface is distributed with the same micro-structure of sawtooth like, and along the direction of the variable angle of screen and throw light, the size of the micro-structure of every row is all variant.
5, front projection display device according to claim 1 is characterized in that: described screen can be the reflectivity screen, and its surface distributed has even or non-homogeneous irreflexive structure of generation.
6, front projection display device according to claim 1 is characterized in that: described screen can be the support that has the screen cover frame around, and screen itself is exactly a stifled wall with reflectance signature, and described device and described wall near.
7, front projection display device according to claim 1 is characterized in that: described cabinet and described ultra-thin reflection type projection optical device at the joint of its emergent ray, are provided with a mobilizable lid.
8, front projection display device according to claim 7, it is characterized in that: lid can be clear glass, comprises the reflectance coating of compensation clear glass aberration on it; Perhaps Huo Dong lid and clear glass exist simultaneously.
9, front projection display device according to claim 1 is characterized in that: the left and right sides fixed sturcture face frame side of described screen is equipped with the audio amplifier of strip, and screen construction face frame and audio amplifier are combined into an integral body.
10, front projection display device according to claim 1 is characterized in that: the left and right sides, described cabinet bottom is equipped with audio amplifier, and described audio amplifier and cabinet form an integral body by frame mode.
11, front projection display device according to claim 1 is characterized in that: described cabinet is the one-body molded or removable mode of fixedlying connected of mould with the connected mode of screen stiffening plate.
12, front projection display device according to claim 10, it is characterized in that: described screen stiffening plate also can be can crispatura or flexible structural plane or pillar, can be by electronic or manually the screen stiffening plate is rolled or folded up with screen, place the upper surface of cabinet or be hidden in the cabinet or fold into the cabinet back side.
13, front projection display device according to claim 11 is characterized in that: can be removable the connection between described reel and the screen stiffening plate.
14, front projection display device according to claim 10 is characterized in that: the pillar that described cabinet is propped and the crossbeam at top can be the loudspeaker casing.
15, front projection display device according to claim 10, it is characterized in that: the crossbeam that the upper surface of the post top portion of described screen stiffening plate or plate face top or cabinet increases can be a reel, an axle is arranged in the reel, reel has the width of being longer than screen but the long opening that close reel two ends are not cut open, one edge of screen passes the long opening of reel, fuse with the axle in the reel, the another side of screen in parallel along fix one than the long opening of reel long or diameter spool can act in the reel by manual or electronic or elastic body and to rotate than on the big straight rod of the long A/F of reel.
16, front projection display device according to claim 1 is characterized in that: other spatial surface of described cabinet can include louvre, interlayer, the drawer of various appearances moulding such as heat dissipation ventilation space and recessed, protruding, arcuation or practicality.
17, front projection display device according to claim 1, it is characterized in that: described screen stiffening plate can be made up of a plate face or the minimum pillar propped from cabinet, screen is fixed on the plate face or lies on the pillar, or increase one or more crossbeam in post top portion or other horizontal level, form I-shaped or square shape or other shape latticed with the cabinet upper surface, screen is fixed thereon.
18, front projection display device according to claim 1, it is characterized in that: each fixes a straight rod the last lower edge of described screen or edge, the left and right sides, vertical or horizontal stretching screen is fixed on two straight rods on cabinet and the crossbeam or on the pillar of both sides or on the plate face again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610159438 CN101089721A (en) | 2006-06-16 | 2006-09-18 | Front projection display device |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200610061145 | 2006-06-16 | ||
| CN200610061145.8 | 2006-06-16 | ||
| CN 200610159438 CN101089721A (en) | 2006-06-16 | 2006-09-18 | Front projection display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101089721A true CN101089721A (en) | 2007-12-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200610159438 Pending CN101089721A (en) | 2006-06-16 | 2006-09-18 | Front projection display device |
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| CN (1) | CN101089721A (en) |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101846868A (en) * | 2009-03-26 | 2010-09-29 | 三洋电机株式会社 | The projection type video display device |
| CN102636948A (en) * | 2012-05-04 | 2012-08-15 | 海信集团有限公司 | Wall-mounted type projecting apparatus |
| CN102866566A (en) * | 2008-12-10 | 2013-01-09 | 株式会社尼康 | Projection apparatus |
| CN103472662A (en) * | 2013-09-10 | 2013-12-25 | 常熟市董浜镇华进电器厂 | Home projection curtain |
| CN104122744A (en) * | 2013-04-26 | 2014-10-29 | 成都傲龙电子有限公司 | Positive projection integrated machine and reflective screen |
| CN104935917A (en) * | 2014-03-20 | 2015-09-23 | 深圳创锐思科技有限公司 | Display method of electronic display device |
| CN106292158A (en) * | 2015-06-08 | 2017-01-04 | 王子强 | Ultrathin display without frame |
| CN106940509A (en) * | 2016-01-05 | 2017-07-11 | 冠捷投资有限公司 | Reflection type projection display |
| CN106941595A (en) * | 2016-01-05 | 2017-07-11 | 深圳市亿思达科技集团有限公司 | Laser intelligence center |
| CN107831837A (en) * | 2017-11-28 | 2018-03-23 | 慧投科技（深圳）有限公司 | Eyes protection display device |
| CN110572598A (en) * | 2019-10-08 | 2019-12-13 | 江苏舜合物联网科技有限公司 | Hidden laser television all-in-one can curl |
| CN112925153A (en) * | 2019-12-05 | 2021-06-08 | 青岛海信激光显示股份有限公司 | Laser projection device |
| CN112925160A (en) * | 2019-12-05 | 2021-06-08 | 青岛海信激光显示股份有限公司 | Laser projection device |
| CN112925161A (en) * | 2019-12-05 | 2021-06-08 | 青岛海信激光显示股份有限公司 | Laser projection device |
| CN113763768A (en) * | 2020-06-02 | 2021-12-07 | 璞洛泰珂(上海)智能科技有限公司 | 360-degree visual simulation device for air traffic control |
-
2006
- 2006-09-18 CN CN 200610159438 patent/CN101089721A/en active Pending
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102866566A (en) * | 2008-12-10 | 2013-01-09 | 株式会社尼康 | Projection apparatus |
| CN101846868A (en) * | 2009-03-26 | 2010-09-29 | 三洋电机株式会社 | The projection type video display device |
| CN102636948A (en) * | 2012-05-04 | 2012-08-15 | 海信集团有限公司 | Wall-mounted type projecting apparatus |
| CN104122744A (en) * | 2013-04-26 | 2014-10-29 | 成都傲龙电子有限公司 | Positive projection integrated machine and reflective screen |
| CN104122744B (en) * | 2013-04-26 | 2016-02-03 | 成都傲龙电子有限公司 | A kind of orthogonal projection all-in-one and reflective viewing screen |
| CN103472662A (en) * | 2013-09-10 | 2013-12-25 | 常熟市董浜镇华进电器厂 | Home projection curtain |
| CN104935917A (en) * | 2014-03-20 | 2015-09-23 | 深圳创锐思科技有限公司 | Display method of electronic display device |
| CN106292158A (en) * | 2015-06-08 | 2017-01-04 | 王子强 | Ultrathin display without frame |
| CN106940509A (en) * | 2016-01-05 | 2017-07-11 | 冠捷投资有限公司 | Reflection type projection display |
| CN106941595A (en) * | 2016-01-05 | 2017-07-11 | 深圳市亿思达科技集团有限公司 | Laser intelligence center |
| CN107831837A (en) * | 2017-11-28 | 2018-03-23 | 慧投科技（深圳）有限公司 | Eyes protection display device |
| CN110572598A (en) * | 2019-10-08 | 2019-12-13 | 江苏舜合物联网科技有限公司 | Hidden laser television all-in-one can curl |
| CN112925153A (en) * | 2019-12-05 | 2021-06-08 | 青岛海信激光显示股份有限公司 | Laser projection device |
| CN112925160A (en) * | 2019-12-05 | 2021-06-08 | 青岛海信激光显示股份有限公司 | Laser projection device |
| CN112925161A (en) * | 2019-12-05 | 2021-06-08 | 青岛海信激光显示股份有限公司 | Laser projection device |
| CN112925161B (en) * | 2019-12-05 | 2022-11-22 | 青岛海信激光显示股份有限公司 | Laser projection device |
| CN112925160B (en) * | 2019-12-05 | 2023-01-10 | 青岛海信激光显示股份有限公司 | Laser projection device |
| CN113763768A (en) * | 2020-06-02 | 2021-12-07 | 璞洛泰珂(上海)智能科技有限公司 | 360-degree visual simulation device for air traffic control |
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Owner name: RED BUTTERFLY SCIENCE AND TECHNOLOGY (SHENZHEN) C Free format text: FORMER OWNER: ANGNAMINGDA DIGITAL DISPLAY TECHNOLOGY (SHENZHEN) CO., LTD. Effective date: 20080926 |
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| TA01 | Transfer of patent application right |
Effective date of registration: 20080926 Address after: 301, two, Fengyun technology building, Fifth Industrial Zone, North Ring Road, Guangdong, Shenzhen, Nanshan District, China: 518055 Applicant after: Butterfly Technology (Shenzhen) Limited Address before: A-C, building 1, building 10, sparrows industrial village, Nanshan District, Guangdong, Shenzhen Province, China: 518057 Applicant before: OMT Digital Display Technology (Shenzhen) Ltd. |
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Open date: 20071219 |