CN100468127C - Projection display device - Google Patents
Projection display device Download PDFInfo
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- CN100468127C CN100468127C CN 200510100207 CN200510100207A CN100468127C CN 100468127 C CN100468127 C CN 100468127C CN 200510100207 CN200510100207 CN 200510100207 CN 200510100207 A CN200510100207 A CN 200510100207A CN 100468127 C CN100468127 C CN 100468127C
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- Prior art keywords
- light
- light source
- source module
- piezoelectric ceramic
- white
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Abstract
This invention relates to a projecting display device. The device includes a white planar light source module, a translucent panel and a piezoelectric ceramic. There is an electrode-array on each of the two relative surfaces of the piezoelectric ceramic, and the electrodes are placed in the two electrode-arrays in one to one correspondence. One of the electrode-array faces the source module, and each electrode in the array has a reflective surface, and the reflective surface is used to reflect the white single polarized reflectance from the source module. One controller provides a predetermined voltage on the two corresponding electrodes to change the space between the two reflective surfaces to create a destructive interference of one kind of color and the scheduled colors.
Description
[technical field]
The present invention relates to a kind of projection display equipment, particularly about a kind of projection display equipment that is used for color display.
[background technology]
Projection display equipment is to utilize optical system and projector space will be amplified and be shown in device on the screen by the luminescent image of information Control.As shown in Figure 1, be a kind of projection display equipment that is used for color display 100 of prior art.This projection display equipment 100 comprises a light source 102, one plus lens, 104, one colour wheels (Color Wheel) 106, one finishing lens 108, one micro mirror chips 110 and projection lens set 112.
This colour wheel 106 comprises red color area 1062, green district 1064 and blue region 1066, and being shaped as of this colour wheel 106 is discoid, and makes this colour wheel 106 around its center high speed rotating with mechanical means.The light that this light source 102 sends is incident to after plus lens 104 converges on this colour wheel 106, and the high speed rotating by this colour wheel 106 makes light repeatedly transmit different colours by not homochromy district at short notice.This color is light that the cycle changes through becoming directional light behind these finishing lens 108 and being incident on the micro mirror parts 1102 on the micro mirror chip 110, these micro mirror parts 1102 receive the signal of from processor 1104 and a plurality of micro mirrors on it are carried out the thousands of inferior deflection actions of per second, the light that each micro mirror reflected is incident on the screen 114 of a correct position after by projection lens set 112, under the visual persistence effect of human eye, the deflection action that the per second of each micro mirror is thousands of times constitutes a field sequential color colour display screen and shows.
This projector with micro lens 100 needs to show that by the cooperation realization coloured image of a plurality of micro mirrors and colour wheel 106 its structure is comparatively complicated that corresponding its processing procedure complexity that causes needs higher cost on making.In addition, colour wheel 106 adopts mechanical means to keep strict rotating speed high-speed rotation, causes the brightness of demonstration, image quality to reduce easily.
[summary of the invention]
In view of this, be necessary to provide the projection display equipment of a kind of easy making and the preferable color quality of tool.
A kind of projection display equipment comprises a white plane light source module, is used to send a plurality of parallel and single polarized lights of uniform white; One piezoelectric ceramic body, with this white plane light source module over against being provided for receiving the white single polarized light that it sends, this piezoelectric ceramic body two relatively the surface one electrod-array is set respectively, electrode in two electrod-arrays is corresponding one by one, one of two electrod-arrays are in the face of this white plane light source module, and should have a reflecting surface in the face of each electrode in the electrod-array of this white plane light source module, the light that this reflecting surface is used for projecting on it reflects; One light-passing board places between this white plane light source module and this piezoelectric ceramic body, is used for projecting the part reflection of the light on it, and allows another part of this light see through; One polarized light beam splitter and a quarter-wave plate, this white plane light source module, this polarized light beam splitter, this quarter-wave plate, this light-passing board and this piezoelectric ceramic body are successively along same axis setting, this quarter-wave plate will be by the phase shifting quarter-wave of its light that passes through, produce the light that forms behind the destruction interference through forming new light behind this quarter-wave plate through the light of described reflecting surface reflected back and light through this light-passing board reflected back, this polarized light beam splitter will should be exported towards the direction vertical with this new light by new light; With a controller, be used to voltage that provides predetermined and the electrode that this voltage is applied to two correspondences, make certain a shade produce destruction interference with reflecting surface and the spacing between this light-passing board that changes the electrode of facing this white plane light source module in these two counter electrodes, and produce predetermined color to be shown.
A kind of projection display equipment comprises a white plane light source module, is used to send a plurality of parallel and single polarized lights of uniform white; One piezoelectric ceramic body, be oppositely arranged with this white plane light source module and be used to receive the white single polarized light that it sends, this piezoelectric ceramic body two relatively the surface one electrod-array is set respectively, electrode in two electrod-arrays is corresponding one by one, one of two electrod-arrays are in the face of this white plane light source module, and should have a reflecting surface in the face of each electrode in the electrod-array of this white plane light source module, the light that this reflecting surface is used for projecting on it reflects; This piezoelectric ceramic body and this white plane light source module tilt to be oppositely arranged; One light-passing board places between this white plane light source module and this piezoelectric ceramic body, is used for projecting the part reflection of the light on it, and allows another part of this light see through; With a controller, be used to voltage that provides predetermined and the electrode that this voltage is applied to two correspondences, make certain a shade produce destruction interference with reflecting surface and the spacing between this light-passing board that changes the electrode of facing this white plane light source module in these two counter electrodes, and produce predetermined color to be shown.
With respect to prior art, described projection display equipment is understood the characteristic that produces variation in thickness after utilizing piezoelectric ceramic body to be applied in voltage, this piezoelectric ceramic body is changed in the face of the reflecting surface of the electrode of white plane light source module and the spacing between the light-passing board and reach a certain color light wavelength 1/4th or satisfy the destruction interference condition of the light of this color, the light of this color is respectively by after light-passing board and the reflection of electrode reflecting surface, can produce destruction interference, and then make the light that white light is exported becomes other color, realize that the coloured image of better quality shows.Electrod-array on this piezoelectric ceramic body can pass through MEMS (micro electro mechanical system) (Micro Electro-Mechanical System, MEMS) processing procedure is finished, mass-produced demand is satisfied in easier making easily.
[description of drawings]
Fig. 1 is a kind of schematic perspective view of projection display equipment of prior art.
Fig. 2 is the floor map of projection display equipment first embodiment of the present invention.
Fig. 3 is the synoptic diagram that the light in the projection display equipment shown in Figure 2 produces destruction interference.
Fig. 4 is the floor map of projection display equipment second embodiment of the present invention.
Fig. 5 is the synoptic diagram that the light in the projection display equipment shown in Figure 4 produces destruction interference.
[embodiment]
The present invention is described in further detail below in conjunction with accompanying drawing.
As shown in Figure 2, be first embodiment of projection display equipment of the present invention.This projection display equipment 200 comprises a white plane light source module 202, a polarized light beam splitter (Polarizing Beam Splitter, PBS) 216, one quarter-wave plate (Quarter-wave Plate), 218, one light-passing board 220, a piezoelectric ceramic body 222, a controller 232 and a projection lens (Projection Lens) 238.This planar light source module 202, polarized light beam splitter 216, quarter-wave plate 218, light-passing board 220 and piezoelectric ceramic body 222 are successively along same axis setting.This projection lens 238 is over against this polarized light beam splitter 216 and be arranged on the direction with this axis normal.
This planar light source module 202 comprises a light source 204, a reflection shield 206, a ultraviolet light and infrared Absorption sheet 208, a prism plate 210, a polarized light conversion element (PSConverter) 212 and a collimating light pipe (Collimator) 214.This light source 204 is used to send white light L1, and it can adopt bulb, light emitting diode, Halogen lamp LED or cold cathode fluorescent lamp pipe.This reflection shield 206 is used for white light L that light source 204 is sent
1Towards this ultraviolet light and the reflection of infrared Absorption sheet 208 directions, this light reflected is L
2This ultraviolet light and infrared Absorption sheet 208, prism plate 210, polarized light conversion element 212 and collimating light pipe 214 are successively along above-mentioned axis setting.This ultraviolet light and infrared Absorption sheet 208 are used for block ultraviolet and infrared light, and visible light is passed through, and can avoid ultraviolet light and infrared light that each optical element in this projection display equipment 200 is produced bad injury.This prism plate 210 is used for homogenising projection light L thereon
2This polarized light conversion element 212 is used for will be by the light L in it
2Be converted to single polarization light L
3, for example P polarized light or S polarized light.This collimating light pipe 214 can adopt optical elements such as optical alignment lens, is used to make light L
3Parallel advancing.So, this light source module 202 can send a plurality of parallel and single polarization light L of uniform white by the mating reaction of above-mentioned each optical element in it
3
This polarized light beam splitter 216 is the prisms that are bonded by two 45 degree isosceles right-angle prism bases, as polarization light L
3Incident is in it the time, and this polarized light beam splitter 216 can allow and be the polarization light L of P polarized light (or S polarized light)
3By.
This quarter-wave plate 218 can be the wideband quarter-wave plate of the wavelength coverage of a corresponding broad, and it can be with the light L that is passed through by it
3Phase shifting 1/4 wavelength, thereby change its polarized light state, this light that is changed polarized light state is L
4This light-passing board 220 can adopt transparent flat-panel components such as glass plate.
This piezoelectric ceramic body 222 comprises a piezoelectric ceramic plate 224, this piezoelectric ceramic plate 224 two relatively the surface be respectively arranged with electrod-array 226,230, the electrode in this two electrod-array 226,230 is corresponding one by one.This electrod-array 226,230 can form integrative-structure by mode and this piezoelectric ceramic plate 224 of metal coating.Piezoelectric ceramic body 222 between the electrode of per two correspondences can be regarded a pixel as.In the face of each electrode in the electrod-array 226 of this planar light source module 202 has a reflecting surface, this reflecting surface is used for the light L that will project on it
4Reflection.For increasing the reflectivity of this reflecting surface, can be on this reflecting surface aluminium film or silverskin.A plurality of voltages that this controller 232 is used to provide predetermined also will this a plurality of voltages be applied to two relative surperficial electrodes with corresponding this piezoelectric ceramic body 222 of a plurality of pixels respectively.This piezoelectric ceramic plate 224 is applied in the variation that promptly can produce thickness behind the voltage.Certainly, the voltage that provided of this controller 232 can come by the processor 1104 corresponding conversion of signals of image that provide with to be shown among Fig. 1 for example.
In the lump with reference to shown in Figure 3, on the light-passing board 220 and electrod-array 226 corresponding with pixel, one predetermined voltage is applied on an electrode 2260 and 2300 by above-mentioned controller 232, and this voltage of being scheduled to makes the reflecting surface 228 of electrode 2260 of this pixel cell correspondence and the spacing d between this light-passing board 220
1Quarter-wave distance for certain a shade.Be incident upon the light L in the light-passing board 220
4A part by in the opposite direction with light L
40Reflected back is through a part of light L of this light-passing board 220
42Also by in the opposite direction with light L
44Reflected back is because this spacing d
1Existence, this light L
40With light L
44Produce destruction interference and become light L
5, this light L
5Because of not or weakened certain above-mentioned a shade, thereby convert the color that institute is scheduled to demonstration to.
Again as shown in Figure 2, the light L that has predetermined display color
5Through behind the quarter-wave plate 218 once more with its phase shifting 1/4 wavelength, thereby become and light L
3The perpendicular polarization light L of polarized light state
6, at this moment, this light L
6Can be become light L by these polarized light beam splitter 216 vertical reflections
7, this light L
7On the screen 240 that is incident to a correct position behind the projection lens 238, realize the Projection Display of a colour element.Be appreciated that behind the reflecting surface difference reflection ray and light generation destruction interference of all pixel cell correspondences, can realize the Projection Display of coloured image on the whole different wave length.
As shown in Figure 4, be second embodiment of projection display equipment of the present invention.This projection display equipment 400 comprises a white plane light source module 402, a light-passing board 420, a piezoelectric ceramic body 422, a controller 432 and a projection lens 438.This planar light source module 402, light-passing board 420 and piezoelectric ceramic body 422 set gradually, and this piezoelectric ceramic body 422 tilts relative with this planar light source module 402, that is to say the normal on the axis at these planar light source module 402 places and plane, this piezoelectric ceramic body 422 place θ that has angle.
This planar light source module 402 is identical with the planar light source module 202 among first embodiment, and it can send a plurality of parallel and single polarization light L of uniform white
4
This light-passing board 420 can adopt transparent flat-panel components such as glass plate.
This piezoelectric ceramic body 422 is identical with the piezoelectric ceramic body 222 among first embodiment.The voltage that this controller 432 is used to provide predetermined also is applied to electrodes with two relative surfaces of corresponding this piezoelectric ceramic body 422 of a pixel with this voltage.
In the lump with reference to shown in Figure 5, on the light-passing board 420 and electrode 4260 and 4300 corresponding with pixel cell, the above-mentioned voltage of being scheduled to makes the reflecting surface 428 of electrode 4260 of this pixel cell correspondence and the spacing d between this light-passing board 420
2Meet the following conditions: d
2=cos θ λ/4, wherein λ is the wavelength of certain a shade.Be incident upon the light L in the light-passing board 420
4A part be reflected into light L
40, through a part of light L of this light-passing board 420
42Be reflected into light L
44, because this spacing d
2Existence, this light L
40With light L
44Produce destruction interference and become light L
5, this light L
5Because of not or weakened certain above-mentioned a shade, thereby convert the color that institute is scheduled to demonstration to.
Again as shown in Figure 4, this light L
5On the screen 440 that is incident to a correct position behind the projection lens 438, realize the Projection Display of coloured image.
With respect to prior art, above-mentioned projection display equipment utilizes piezoelectric ceramic plate to be applied in the variation in thickness that produces behind the voltage, make this piezoelectric ceramic plate in the face of the reflecting surface of the electrode of planar light source module and light wavelength that the spacing between the light-passing board reaches a certain color 1/4th or satisfy the destruction interference condition of the light of this color, the light of this color is respectively by after light-passing board and the reflection of electrode reflecting surface, produce destruction interference, and then make the light that white light is exported becomes other color, realize that the coloured image of better quality shows.Electrod-array on this piezoelectric ceramic plate can be finished by the MEMS (micro electro mechanical system) processing procedure, and mass-produced demand is satisfied in easier making easily.
In addition, those skilled in the art can also do other variation in spirit of the present invention, certainly, the variation that these are done according to spirit of the present invention, all should be included in the present invention's scope required for protection in.
Claims (13)
1. projection display equipment is characterized in that comprising:
One white plane light source module is used to send a plurality of parallel and single polarized lights of uniform white;
One piezoelectric ceramic body, with this white plane light source module over against being provided for receiving the white single polarized light that it sends, this piezoelectric ceramic body two relatively the surface one electrod-array is set respectively, electrode in two electrod-arrays is corresponding one by one, one of two electrod-arrays are in the face of this white plane light source module, and should have a reflecting surface in the face of each electrode in the electrod-array of this white plane light source module, the light that this reflecting surface is used for projecting on it reflects;
One light-passing board places between this white plane light source module and this piezoelectric ceramic body, is used for projecting the part reflection of the light on it, and allows another part of this light see through;
One polarized light beam splitter and a quarter-wave plate, this white plane light source module, this polarized light beam splitter, this quarter-wave plate, this light-passing board and this piezoelectric ceramic body are successively along same axis setting, this quarter-wave plate will be by the phase shifting quarter-wave of its light that passes through, produce the light that forms behind the destruction interference through forming new light behind this quarter-wave plate through the light of described reflecting surface reflected back and light through this light-passing board reflected back, this polarized light beam splitter will should be exported towards the direction vertical with this new light by new light; With
One controller, be used to voltage that provides predetermined and the electrode that this voltage is applied to two correspondences, make certain a shade produce destruction interference with reflecting surface and the spacing between this light-passing board that changes the electrode of facing this white plane light source module in these two counter electrodes, and produce predetermined color to be shown.
2. projection display equipment as claimed in claim 1 is characterized in that: further comprise a projection lens, this projection lens receives the light by this polarized light beam splitter output.
3. projection display equipment as claimed in claim 1 is characterized in that: this quarter-wave plate is the wideband quarter-wave plate.
4. projection display equipment as claimed in claim 1 is characterized in that: this white plane light source module comprises:
One light source is used to send white light;
One reflection shield is used for white light towards this piezoelectric ceramic body direction reflection; With
One polarized light conversion element is used for the light of this reflection shield reflection is converted to single polarized light.
5. projection display equipment as claimed in claim 4 is characterized in that: further comprise:
One prism plate is arranged between this light source and this polarized light conversion element; With
One ultraviolet light and infrared Absorption sheet are arranged between this light source and this prism plate.
6. projection display equipment as claimed in claim 4 is characterized in that: further comprise a collimating light pipe, this collimating light pipe is arranged between this polarized light conversion element and this polarized light beam splitter.
7. projection display equipment as claimed in claim 4 is characterized in that: this light source is to be selected from: bulb, light emitting diode, Halogen lamp LED or cold cathode fluorescent lamp pipe.
8. projection display equipment as claimed in claim 1 is characterized in that: this light-passing board is a glass plate.
9. projection display equipment as claimed in claim 1 is characterized in that: this piezoelectric ceramic body comprises the piezoelectric ceramic plate that is arranged between two electrod-arrays.
10. projection display equipment as claimed in claim 9 is characterized in that: two electrod-arrays are to form integrative-structure by the mode of metal coating and this piezoelectric ceramic plate.
11. projection display equipment as claimed in claim 1 is characterized in that: be coated with aluminium film or silverskin on this reflecting surface.
12. a projection display equipment is characterized in that comprising:
One white plane light source module is used to send a plurality of parallel and single polarized lights of uniform white;
One piezoelectric ceramic body, be oppositely arranged with this white plane light source module and be used to receive the white single polarized light that it sends, this piezoelectric ceramic body two relatively the surface one electrod-array is set respectively, electrode in two electrod-arrays is corresponding one by one, one of two electrod-arrays are in the face of this white plane light source module, and should have a reflecting surface in the face of each electrode in the electrod-array of this white plane light source module, the light that this reflecting surface is used for projecting on it reflects; This piezoelectric ceramic body and this white plane light source module tilt to be oppositely arranged;
One light-passing board places between this white plane light source module and this piezoelectric ceramic body, is used for projecting the part reflection of the light on it, and allows another part of this light see through; With
One controller, be used to voltage that provides predetermined and the electrode that this voltage is applied to two correspondences, make certain a shade produce destruction interference with reflecting surface and the spacing between this light-passing board that changes the electrode of facing this white plane light source module in these two counter electrodes, and produce predetermined color to be shown.
13. projection display equipment as claimed in claim 12, it is characterized in that: further comprise a projection lens, this projection lens receives through the light of described reflecting surface reflected back and formed new light behind the light generation destruction interference of this light-passing board reflected back.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510100207 CN100468127C (en) | 2005-10-07 | 2005-10-07 | Projection display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510100207 CN100468127C (en) | 2005-10-07 | 2005-10-07 | Projection display device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1945377A CN1945377A (en) | 2007-04-11 |
| CN100468127C true CN100468127C (en) | 2009-03-11 |
Family
ID=38044858
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510100207 Expired - Fee Related CN100468127C (en) | 2005-10-07 | 2005-10-07 | Projection display device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100468127C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110764348A (en) * | 2018-07-27 | 2020-02-07 | 中强光电股份有限公司 | Projection device |
| CN112684657B (en) * | 2020-12-24 | 2022-02-01 | 四川长虹电器股份有限公司 | Method for collimating solid-state light-emitting chip or chip array light source |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1290356A (en) * | 1997-10-31 | 2001-04-04 | 硅光机器公司 | Display apparatus including grating light-valve array and interferometric optical system |
| US20020141068A1 (en) * | 2001-03-30 | 2002-10-03 | Philips Electronics North America Corporation | Color correction to target white points by adjustment of two colors |
| JP2002323674A (en) * | 2001-04-24 | 2002-11-08 | Sony Corp | Projection video device |
| US20040218251A1 (en) * | 2003-04-30 | 2004-11-04 | Arthur Piehl | Optical interference pixel display with charge control |
| US20040240057A1 (en) * | 2000-08-24 | 2004-12-02 | Cogent Light Technologies, Inc. | Polarization recovery system for projection displays |
-
2005
- 2005-10-07 CN CN 200510100207 patent/CN100468127C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1290356A (en) * | 1997-10-31 | 2001-04-04 | 硅光机器公司 | Display apparatus including grating light-valve array and interferometric optical system |
| US20040240057A1 (en) * | 2000-08-24 | 2004-12-02 | Cogent Light Technologies, Inc. | Polarization recovery system for projection displays |
| US20020141068A1 (en) * | 2001-03-30 | 2002-10-03 | Philips Electronics North America Corporation | Color correction to target white points by adjustment of two colors |
| JP2002323674A (en) * | 2001-04-24 | 2002-11-08 | Sony Corp | Projection video device |
| US20040218251A1 (en) * | 2003-04-30 | 2004-11-04 | Arthur Piehl | Optical interference pixel display with charge control |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1945377A (en) | 2007-04-11 |
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