CN201853049U - Projection imaging device based on red-green-blue LED (Light-Emitting Diode) light sources - Google Patents
Projection imaging device based on red-green-blue LED (Light-Emitting Diode) light sources Download PDFInfo
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- CN201853049U CN201853049U CN2010205794226U CN201020579422U CN201853049U CN 201853049 U CN201853049 U CN 201853049U CN 2010205794226 U CN2010205794226 U CN 2010205794226U CN 201020579422 U CN201020579422 U CN 201020579422U CN 201853049 U CN201853049 U CN 201853049U
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Abstract
The utility model discloses a projection imaging device based on red-green-blue LED light sources, which belongs to the field of optical projection imaging. Three-color rectangular primary-color ray bundles are formed by the device through a read LED light-source module, a green LED light-source module and a blue LED light-source module; the three-color rectangular primary-color ray bundles are used for respectively and directly irradiating a three-color LCD (Liquid Crystal Display) liquid-crystal imaging plate to form three primary-color imaging ray bundles; and a colored imaging ray is synthesized by the three primary-color imaging ray bundles through a three-primary-color light synthesis module and is imaged through projection by an imaging lens module. A geometric theory that the diameter of a sphere passes through the center of the sphere is utilized, and a spherical crown-shaped concave surface is adopted as the baseplate of the LED light-source modules, so that all the LED rays are converged at the center of the sphere to generate a high-brightness convergent point light source, and the technical difficulty problem of short-distance convergence of LED matrix light sources is solved. Compared with the prior art, the device has the characteristics of a low color temperature, a small quantity of generated infrared rays and ultraviolet rays, no damageable parts, such as electrodes, filaments and the like, no light loss caused by spectroscopes, a high brightness, a long service life and the like.
Description
Technical field
The utility model relates to the optical projection imaging field, and a kind of projection imaging device based on the red-green-blue led light source specifically is provided.
Background technology
Projector is as terminal display, and volume is little, rich color, and imaging size is big, the brightness height, the contrast height, in light weight, easy to carry, be widely used in classroom instruction, training for industry, exchange of technology, fields such as amusement.Existing projector mainly is projected as image-forming principle with the arc light light source: U
HPThe conical light that arc lamp produces, at first light filters infrared ray and ultraviolet ray by optical filter.See through lens wearer more than two with equalizing light rays, and will to proofread and correct be the rectangular ray of light approximate with projected image.Light is divided into Red Green Blue by spectroscope and is reflexed on the corresponding red, green, blue LCD panel (Thin Film Transistor (TFT)) respectively and see through LCD panel then.Driving circuit makes the orderly deflection of each liquid crystal cells liquid crystal on the three primary colours LCD panel, controls the transmittance of corresponding primary colors, and last three road light are gathered together by camera lens and project in the screen, and have produced coloury image.
On the one hand, because the UHP arc lamp belongs to gas discharge, produce infrared ray and ultraviolet ray during work, LCD panel there is certain damage, so, along with the working time prolongs, electrode erosion, the gap increases, electrode metal vaporization back is attached to glass spheres inside, luminous intensity sharply descends, so that the UHP arc lamp is short serviceable life, needs frequently to change.On the other hand, need spectroscope that source light is decomposed in its course of work, and extract red-green-blue, again by airtight light path and lens set, respectively three primary colours light is delivered on the red, green, blue LCD panel, light loss is big, complex structure.
In order to solve above-mentioned the deficiencies in the prior art, in publication number is the patent document of CN 1206865C a kind of " system and method that is used for the use led light source of Projection Display " disclosed.This method is to adopt fiber optic conduction light, converges in conductive process, shines LCD again.And optical fiber is mainly used in the light conducting signal at present, and luminous energy is less, and the optical fiber that is used to conduct such as 20 lumens does not appear in the newspapers, the size of fiber optic conduction energy is relevant with the sectional area of light, and high-octane light must have big heat, can make the fibre strain of polymeric material, influences the light conduction.
Summary of the invention
The utility model is at above-mentioned the deficiencies in the prior art, provides a kind of colour temperature low, produces infrared ray and ultraviolet ray and measures few, easily worn parts such as electrodeless, filament, the light loss that no spectroscope causes, brightness height, the projection imaging device that the life-span is long based on the red-green-blue led light source.
The technical scheme that its technical matters that solves the utility model adopts is: based on the projection imaging device of red-green-blue led light source, comprise the red LED light source module, the green LED light source module, the blue LED light source module, red LCD liquid crystal imaging plate, green LCD liquid crystal imaging plate, blue LCD liquid crystal imaging plate, three primary colours light compositing module, the imaging len module, LCD liquid crystal imaging plate driver module, led light source driving power module, led light source module temperature detecting module, led light source module heat dissipating blower fan, the cooling fan driver module, temperature control modules and power module
Red LED light source module, green LED light source module and blue LED light source module: be respectively applied for and produce red rectangle primary lights wire harness, green rectangle primary lights wire harness and blue rectangle primary lights wire harness;
Red LCD liquid crystal imaging plate, green LCD liquid crystal imaging plate, blue LCD liquid crystal imaging plate, three primary colours light compositing module and imaging len module: red rectangle primary lights wire harness, green rectangle primary lights wire harness and blue rectangle primary lights the wire harness red LCD liquid crystal imaging of direct irradiation plate, green LCD liquid crystal imaging plate and blue LCD liquid crystal imaging plate respectively form three primary colours imaging wire harness, again through the synthetic colour imaging light of three primary colours light compositing module, and through imaging len module projection imaging;
LCD liquid crystal imaging plate driver module: be electrically connected with red LCD liquid crystal imaging plate, green LCD liquid crystal imaging plate and blue LCD liquid crystal imaging plate, be used for receiving video signals, and drive red LCD liquid crystal imaging plate, green LCD liquid crystal imaging plate and blue LCD liquid crystal imaging plate;
Led light source driving power module: link to each other with red LED light source module, green LED light source module, blue LED light source module, LCD liquid crystal imaging plate driver module respectively, it is luminous to be used to drive red LED light source module, green LED light source module and blue LED light source module, and controls its duty; Be used to drive LCD liquid crystal imaging plate driver module;
Led light source module temperature detecting module: be arranged on position, be used to detect the working temperature of red LED light source module, green LED light source module and blue LED light source module near red LED light source module, green LED light source module and blue LED light source module;
Led light source module heat dissipating blower fan: be arranged on position, be used for the radiating and cooling of red LED light source module, green LED light source module and blue LED light source module near red LED light source module, green LED light source module, blue LED light source module;
Cooling fan driver module: be electrically connected with led light source module heat dissipating blower fan, be used for driving LED light source module cooling fan;
Temperature control modules: link to each other with led light source module temperature detecting module, led light source driving power module, power module respectively, be used to receive the temperature signal of processing from led light source module temperature detecting module, and control power module and led light source driving power module duty;
Power module: link to each other with cooling fan driver module, led light source driving power module, temperature control modules respectively, be used to cooling fan driver module, led light source driving power module and temperature control modules power supply.
Because the blue led light-emitting diode luminance with power only is about half of redness, green LED light-emitting diode luminance at present, make image that projection becomes produce pure white, the luminance brightness that red, green, blue three-color LED light source module is produced must be consistent.At present, main passing through reduces red, green led light source modular power, increases blue LED light source module power relatively, and it is unified that three-color light source brightness is arrived.The utility model preferable methods is to utilize the optics superposition principle, and the light that two blue LED light source modules are produced superposes, and improves brightness, and concrete grammar is as follows:
Described blue LED light source module is made of the first blue LED light source module, the second blue LED light source module and blue light synthesis module,
The first blue LED light source module, the second blue LED light source module form the first blue rectangle primary lights wire harness and the second blue rectangle primary lights wire harness respectively;
The blue light synthesis module: the synthetic first blue rectangle primary lights wire harness and the second blue rectangle primary lights wire harness are to strengthen blue light intensity.
Preferably, the red LED light source module, the green LED light source module and the first blue LED light source module, the second blue LED light source module includes the LED luminophor, spherical concave surface substrate, plus lens and shadow shield, some LED luminophors are laid in the concave surface of spherical concave surface substrate, the light that each LED luminophor produces is after the concave surface centre of sphere converges, pool undistorted and the cylindrical light shafts of three primary colours aberration by plus lens again, described shadow shield is arranged on plus lens light and exports a side, the shadow shield middle part has rectangular window, is used for the cylindrical light shafts of three primary colours of plus lens output are become three primary colours rectangular light wire harness.
In order to improve the heat dispersion of each led light source module, can on spherical concave surface substrate, heating radiator be set.
In addition, can between spherical concave surface substrate and plus lens, prefocus cup be set, described prefocus cup both ends open, an openend is connected with spherical concave surface substrate edge, and another openend is connected with the plus lens edge.On the one hand, prefocus cup can be used for the light of assemblying part scattering, and plays airtight effect; On the other hand, can be used as the support of plus lens.
Described LED luminophor preferably adopts LED monomer encapsulation mode, comprise concave surface convex lens, parabolic type prefocus cup and LED LED core, the LED LED core is arranged on the focus of parabolic type prefocus cup, the concave surface convex lens are arranged on the openend of parabolic type prefocus cup, between concave surface convex lens and parabolic type prefocus cup, be filled with the high transmission rate high thermal conductivity materials, as: the organic glass of TT860 transparent organic silicon casting glue, PMMA modification etc.Concave surface convex lens and parabolic type prefocus cup are formed the light collecting system jointly, and making LED luminophor output light is a column type parallel beam.
Projection imaging device based on the red-green-blue led light source of the present utility model is compared with prior art, has following outstanding beneficial effect:
One, adopt the red, green, blue three primary colors LED light source module direct irradiation red, green, blue three dichroic liquid crystal imaging plate imagings respectively of drive, the light loss that no spectroscope causes has improved the light source utilization factor;
Two, need not optical fiber, directly utilize plus lens to converge each color light source once more, and direct irradiation LCD, light conduction effect is good;
Three, utilize the optics superposition principle, the light that two blue led light source matrixes are produced superposes, and improves brightness, can effectively solve the low technical barrier of blue light brightness;
Four, utilize the geometric theory of the diameter of ball by the centre of sphere, adopt the substrate of spherical concave surface as the led light source module, the LED luminophor of cylindrical parallel light will be produced, press circular arrangement on the concave surface spherical crown, radially place, each LED light is converged on the centre of sphere, produce the convergent point light source of high brightness, solved the short distance of LED matrix light source and converged technical barrier;
Five, to have colour temperature low for red, green, blue three-primary color LED light emitting diode, produce infrared ray and ultraviolet ray amount seldom,, need not infrared and ultraviolet filter LCD liquid crystal board not damaged, easily worn parts such as electrodeless, filament are long-life environment-friendly novel projection imaging systems;
Six, red, green, blue three primary colours great power LED light emitting diode spectrum is pure, and image color is more true to nature, the sharpness height;
Seven, the used light-emitting diode chip for backlight unit of redgreenblue led light source module all based on existing mature manufacturing technology, helps large-scale promotion, reduces cost.
Description of drawings
Accompanying drawing 1 is the structural representation of projection imaging system among the utility model embodiment one;
Accompanying drawing 2 is structural representations of projection imaging system among the utility model embodiment two;
Accompanying drawing 3 is red, green, blue led light source modular structure synoptic diagram among Fig. 1, Fig. 2;
Accompanying drawing 4 is A-A cut-open views of light source module among Fig. 3;
Accompanying drawing 5 is LED luminous body structure synoptic diagram among Fig. 1, Fig. 2
Embodiment
The utility model is described in further detail below in conjunction with the drawings and specific embodiments, but not as to qualification of the present utility model.
Provide two most preferred embodiments below:
Embodiment one:
As shown in Figure 1, based on the projection imaging device of red-green-blue led light source mainly by red LED light source module 1, green LED light source module 5, the blue LED light source module, red LCD liquid crystal imaging plate 2, green LCD liquid crystal imaging plate 4, blue LCD liquid crystal imaging plate 6, three primary colours light compositing module 3, imaging len module 7, LCD liquid crystal imaging plate driver module 8, led light source driving power module 9, led light source module temperature detecting module 10,11, led light source module heat dissipating blower fan 12,13,14,15, cooling fan driver module 16, temperature control modules 17 and power module 18 constitute.
Wherein, the blue LED light source module is made of the first blue LED light source module 19, the second blue LED light source module 20 and blue light synthesis module 21.
Red LED light source module 1, green LED light source module 5 are respectively applied for and produce red rectangle primary lights wire harness, green rectangle primary lights wire harness;
The first blue rectangle primary lights wire harness and the second blue rectangle primary lights wire harness that the first blue LED light source module 19, the second blue LED light source module 20 form form blue rectangle primary lights wire harness after blue light synthesis module 21 synthesizes.
Red LED light source module 1, the first blue LED light source module 19 are placed in the left side side by side; Green LED light source module 5, the second blue LED light source module 20 are placed in the right side side by side.
Red rectangle primary lights wire harness, green rectangle primary lights wire harness and blue rectangle primary lights the wire harness red LCD liquid crystal imaging of direct irradiation plate 2, green LCD liquid crystal imaging plate 4 and blue LCD liquid crystal imaging plate 6 respectively form three primary colours imaging wire harness, again through three primary colours light compositing module 3 synthetic colour imaging light, and through imaging len module 7 projection imagings.
LCD liquid crystal imaging plate driver module 8 is electrically connected with red LCD liquid crystal imaging plate 2, green LCD liquid crystal imaging plate 4 and blue LCD liquid crystal imaging plate 6, be used to receive the VGA vision signal, and drive red LCD liquid crystal imaging plate 2, green LCD liquid crystal imaging plate 4 and 6 work of blue LCD liquid crystal imaging plate.
Led light source driving power module 9 links to each other with red LED light source module 1, green LED light source module 5, the first blue LED light source module 19, the second blue LED light source module 20, LCD liquid crystal imaging plate driver module 8 respectively, it is luminous to be used to drive each light source module, control its duty, drive LCD liquid crystal imaging plate driver module 8 simultaneously.
Led light source module temperature detecting module 10 is placed in the middle of the red LED light source module 1 and the first blue LED light source module 19, is used to detect the working temperature of left side two light source modules; Led light source module temperature detecting module 11 is placed in the middle of green LED light source module 5, the second blue LED light source module 20, is used to detect the working temperature of left side two light source modules.
Led light source module heat dissipating blower fan 12,13,14,15 is separately positioned on the position near red LED light source module 1, green LED light source module 5, the first blue LED light source module 19, the second blue LED light source module 20, two are used for air-supply, two are used for air draft, are each light source module radiating and cooling.
Cooling fan driver module 16 is electrically connected with led light source module heat dissipating blower fan 12,13,14,15 respectively, is used to drive each led light source module heat dissipating blower fan.
Shown in accompanying drawing 3,4: above-mentioned red LED light source module 1, green LED light source module 5 and the first blue LED light source module 19, the second blue LED light source module 20 constitute by LED luminophor 22, spherical concave surface substrate 23, plus lens 24, shadow shield 25, heating radiator 26 and prefocus cup 27.
Described spherical concave surface substrate 23 is made by high thermal conductivity, non-conductive, exotic material, and a side is the plane, and a side is spherical concave surface.
Some LED luminophors are laid in concave surface one side of spherical concave surface substrate 23, the cylindrical light that each LED luminophor produces all can pass through the concave surface centre of sphere, be specially: each LED luminophor 22 is the center with concave surface spherical crown summit, be distributed on the spherical concave surface substrate 23 by annular, concave surface spherical crown size is by projector's design brightness and volume decision, projector's design brightness is high more, and required red, green and blue LED luminophor 22 is many more, and concave surface spherical crown area is just big more.
Plus lens 24 is arranged on the outside of the spherical concave surface substrate 23 concave surface centre ofs sphere by prefocus cup 27, is used for pooling undistorted the light that LED luminophor 22 produces and the cylindrical light shafts of three primary colours aberration.Described plus lens 24 can be made up of a series of convex lens, concavees lens, and the light that LED luminophor 22 is produced pools the cylindrical light shafts that diameter is not more than 1.4 inches undistorted and aberration.Undistorted and the cylindrical light shafts diameter of aberration of plus lens 24 outputs, by selected LCD liquid crystal imaging board size decision, those of ordinary skills all can design required combination of lenses according to concave surface spherical crown radius and LCD liquid crystal imaging board size.
Described prefocus cup 27 both ends opens, an openend is connected with spherical concave surface substrate 23 edges, and another openend is connected with plus lens 24 edges.
As shown in Figure 5: above-mentioned LED luminophor 22 mainly is made of concave surface convex lens 28, parabolic type prefocus cup 29 and LED LED core 30.LED LED core 30 is fixed on the focus of parabolic type prefocus cup 29.Concave surface convex lens 28 are fixed on the openend of parabolic type prefocus cup 29.The inwall light of described parabolic type prefocus cup 29 has the better reflective function that gets.Between concave surface convex lens and parabolic type prefocus cup, be filled with the high transmission rate high thermal conductivity materials.Concave surface convex lens 28 and the parabolic type prefocus cup 29 common light collecting systems of forming, making LED luminophor output light is a column type parallel beam.LED luminophor encapsulation back diameter d is not more than 6mm, and high h is not more than 7mm.The LED LED core is selected redness, green, blueness respectively, preferred 3w of power and 5w.
Embodiment 2:
As shown in Figure 2, based on the projection imaging device of red-green-blue led light source mainly by red LED light source module 1, green LED light source module 5, blue LED light source module 19, red LCD liquid crystal imaging plate 2, green LCD liquid crystal imaging plate 4, blue LCD liquid crystal imaging plate 6, three primary colours light compositing module 3, imaging len module 7, LCD liquid crystal imaging plate driver module 8, led light source driving power module 9, led light source module temperature detecting module 10,11,12, led light source module heat dissipating blower fan 13,14,15, cooling fan driver module 16, temperature control modules 17 and power module 18 constitute.
Wherein, red LED light source module 1, green LED light source module 5, blue LED light source module 19 are respectively applied for and produce red rectangle primary lights wire harness, green rectangle primary lights wire harness, green rectangle primary lights wire harness.
Be characterized in only having adopted a blue LED light source module 19, the blue LCD liquid crystal imaging of direct irradiation plate 6.Reduce the power of red green led light source module 1,5, increase blue LED light source module 19 power relatively, it is unified that three-color light source brightness is arrived, and volume is littler.
Connection that other is concrete and control method are the same with embodiment together.
Above-described embodiment, the utility model two kinds of embodiment more preferably just, the common variation that those skilled in the art carries out in the technical solutions of the utility model scope and replacing all should be included in the protection domain of the present utility model.
Claims (5)
1. based on the projection imaging device of red-green-blue led light source, it is characterized in that this device comprises: the red LED light source module, the green LED light source module, the blue LED light source module, red LCD liquid crystal imaging plate, green LCD liquid crystal imaging plate, blue LCD liquid crystal imaging plate, three primary colours light compositing module, the imaging len module, LCD liquid crystal imaging plate driver module, led light source driving power module, led light source module temperature detecting module, led light source module heat dissipating blower fan, the cooling fan driver module, temperature control modules and power module
Red LED light source module, green LED light source module and blue LED light source module: be respectively applied for and produce red rectangle primary lights wire harness, green rectangle primary lights wire harness and blue rectangle primary lights wire harness;
Red LCD liquid crystal imaging plate, green LCD liquid crystal imaging plate, blue LCD liquid crystal imaging plate, three primary colours light compositing module and imaging len module: red rectangle primary lights wire harness, green rectangle primary lights wire harness and blue rectangle primary lights the wire harness red LCD liquid crystal imaging of direct irradiation plate, green LCD liquid crystal imaging plate and blue LCD liquid crystal imaging plate respectively form three primary colours imaging wire harness, again through the synthetic colour imaging light of three primary colours light compositing module, and through imaging len module projection imaging;
LCD liquid crystal imaging plate driver module: be electrically connected with red LCD liquid crystal imaging plate, green LCD liquid crystal imaging plate and blue LCD liquid crystal imaging plate, be used for receiving video signals, and drive red LCD liquid crystal imaging plate, green LCD liquid crystal imaging plate and blue LCD liquid crystal imaging plate;
Led light source driving power module: link to each other with red LED light source module, green LED light source module, blue LED light source module, LCD liquid crystal imaging plate driver module respectively, it is luminous to be used to drive red LED light source module, green LED light source module and blue LED light source module, and controls its duty; Be used to drive LCD liquid crystal imaging plate driver module;
Led light source module temperature detecting module: be arranged on position, be used to detect the working temperature of red LED light source module, green LED light source module and blue LED light source module near red LED light source module, green LED light source module and blue LED light source module;
Led light source module heat dissipating blower fan: be arranged on position, be used for the radiating and cooling of red LED light source module, green LED light source module and blue LED light source module near red LED light source module, green LED light source module, blue LED light source module;
Cooling fan driver module: be electrically connected with led light source module heat dissipating blower fan, be used for driving LED light source module cooling fan;
Temperature control modules: link to each other with led light source module temperature detecting module, led light source driving power module, power module respectively, be used to receive the temperature signal of processing from led light source module temperature detecting module, and control power module and led light source driving power module duty;
Power module: link to each other with cooling fan driver module, led light source driving power module, temperature control modules respectively, be used to cooling fan driver module, led light source driving power module and temperature control modules power supply.
2. the projection imaging device based on the red-green-blue led light source according to claim 1 is characterized in that, described blue LED light source module is made of the first blue LED light source module, the second blue LED light source module and blue light synthesis module,
The first blue LED light source module, the second blue LED light source module form the first blue rectangle primary lights wire harness and the second blue rectangle primary lights wire harness respectively;
The blue light synthesis module: the synthetic first blue rectangle primary lights wire harness and the second blue rectangle primary lights wire harness are to strengthen blue light intensity.
3. the projection imaging device based on the red-green-blue led light source according to claim 2, it is characterized in that, the red LED light source module, the green LED light source module and the first blue LED light source module, the second blue LED light source module includes the LED luminophor, spherical concave surface substrate, plus lens and shadow shield, some LED luminophors are laid in the concave surface of spherical concave surface substrate, the LED luminophor is radially fixing, the column type parallel beam that each LED luminophor produces is after the concave surface centre of sphere converges, pool undistorted and the cylindrical light shafts of three primary colours aberration by plus lens again, described shadow shield is arranged on plus lens light and exports a side, the shadow shield middle part has rectangular window, is used for the cylindrical light shafts of three primary colours of plus lens output are become three primary colours rectangular light wire harness.
4. the projection imaging device based on the red-green-blue led light source according to claim 3 is characterized in that,
Spherical concave surface substrate is provided with heating radiator,
Between spherical concave surface substrate and plus lens, be provided with prefocus cup, described prefocus cup both ends open, an openend is connected with spherical concave surface substrate edge, and another openend is connected with the plus lens edge.
5. the projection imaging device based on the red-green-blue led light source according to claim 3, it is characterized in that, described LED luminophor comprises concave surface convex lens, parabolic type prefocus cup and LED LED core, the LED LED core is arranged on the focus of parabolic type prefocus cup, the concave surface convex lens are arranged on the openend of parabolic type prefocus cup, are filled with the high transmission rate high thermal conductivity materials between concave surface convex lens and parabolic type prefocus cup.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205794226U CN201853049U (en) | 2010-10-27 | 2010-10-27 | Projection imaging device based on red-green-blue LED (Light-Emitting Diode) light sources |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010205794226U CN201853049U (en) | 2010-10-27 | 2010-10-27 | Projection imaging device based on red-green-blue LED (Light-Emitting Diode) light sources |
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| CN201853049U true CN201853049U (en) | 2011-06-01 |
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| CN2010205794226U Expired - Fee Related CN201853049U (en) | 2010-10-27 | 2010-10-27 | Projection imaging device based on red-green-blue LED (Light-Emitting Diode) light sources |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102033401A (en) * | 2010-10-27 | 2011-04-27 | 许崇良 | Projection imaging method and system based on red, green and blue LED light sources |
| CN113395500A (en) * | 2021-06-11 | 2021-09-14 | 京东方科技集团股份有限公司 | Projection optical machine, driving method thereof and projection equipment |
-
2010
- 2010-10-27 CN CN2010205794226U patent/CN201853049U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102033401A (en) * | 2010-10-27 | 2011-04-27 | 许崇良 | Projection imaging method and system based on red, green and blue LED light sources |
| CN113395500A (en) * | 2021-06-11 | 2021-09-14 | 京东方科技集团股份有限公司 | Projection optical machine, driving method thereof and projection equipment |
| CN113395500B (en) * | 2021-06-11 | 2022-09-23 | 京东方科技集团股份有限公司 | Projection optical machine, driving method thereof and projection equipment |
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