CN114690281A - Color microlens array and projection apparatus - Google Patents
Color microlens array and projection apparatus Download PDFInfo
- Publication number
- CN114690281A CN114690281A CN202011635926.XA CN202011635926A CN114690281A CN 114690281 A CN114690281 A CN 114690281A CN 202011635926 A CN202011635926 A CN 202011635926A CN 114690281 A CN114690281 A CN 114690281A
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- display screen
- lcd display
- micro
- light
- lens
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- 239000000758 substrate Substances 0.000 claims description 18
- 239000011521 glass Substances 0.000 claims description 9
- 239000004973 liquid crystal related substance Substances 0.000 claims description 7
- 239000010409 thin film Substances 0.000 claims description 5
- 230000003287 optical effect Effects 0.000 abstract description 25
- 239000003086 colorant Substances 0.000 abstract description 6
- 230000005684 electric field Effects 0.000 abstract description 2
- 230000000903 blocking effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 125000006850 spacer group Chemical group 0.000 description 3
- 238000003491 array Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000002861 polymer material Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000005499 meniscus Effects 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 229910052724 xenon Inorganic materials 0.000 description 1
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/0006—Arrays
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133526—Lenses, e.g. microlenses or Fresnel lenses
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/005—Projectors using an electronic spatial light modulator but not peculiar thereto
- G03B21/006—Projectors using an electronic spatial light modulator but not peculiar thereto using LCD's
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Optics & Photonics (AREA)
- Liquid Crystal (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
Abstract
The invention relates to a color micro-lens array and a projection device, which comprise an LCD display screen, a plurality of first micro-lenses and a plurality of second micro-lenses, wherein the first micro-lenses and the second micro-lenses are respectively positioned on the surfaces of the two sides of the LCD display screen, each first micro-lens and one second micro-lens respectively correspond to form a light channel, the LCD display screen is provided with a plurality of pixel units which are arranged in an array manner, each light channel corresponds to a plurality of pixel units, and images formed by the light channels are mutually overlapped. The invention combines the micro lens array and the LCD display screen to form an optical system which can edit the projection pattern, the LCD display screen drives and displays through the driving chip and the driving chip, different gray scale brightness is formed by using different electric field sizes to obtain pictures with different colors, and then the micro lens array is used for superposing the display pictures of a plurality of optical channels, thereby forming the required color pattern on the projection surface.
Description
Technical Field
The invention belongs to the technical field of optical projection, and particularly relates to a color micro-lens array and an optical projection device applying the micro-lens array technology.
Background
A Micro Lens Array (MLA) is an array type multi-lens structure with a multi-channel structure produced by a semiconductor manufacturing technology, and can be applied to various fields such as a projector, a guest-greeting projection lamp, and warning illumination/projection, and the structure of the conventional MLA is shown in fig. 1. The existing projection lamp mostly adopts a single mask to form a pattern to be projected, forms a single projection pattern with little color change (1-2 colors) on the ground through the mask by light rays, and cannot meet the diversified demands of the market.
Disclosure of Invention
In order to solve the above technical problems, an object of the present invention is to provide a color optical projection apparatus with rich projection colors and variable editing contents.
In order to achieve the purpose of the invention, the invention adopts the following technical scheme: the utility model provides a colored microlens array, includes the LCD display screen and is located respectively LCD display screen both sides surface a plurality of first microlenses and a plurality of second microlenses, each first microlens correspond with a second microlens respectively and form a light channel, the LCD display screen pixel unit that a plurality of array were arranged has, correspond respectively in each light channel a plurality of the pixel unit, and a plurality of the image that light channel becomes coincide each other.
In the above-mentioned technical solution, preferably, a plurality of the first microlenses, the LCD panel, and a plurality of the second microlenses are integrally formed.
Optionally, the color microlens array further includes a transparent substrate, and the transparent substrate is located between the second microlens and the LCD display screen.
Optionally, the first microlens is a convex plano lens, and the second microlens is a plano-convex lens.
Optionally, the LCD display screen includes a lower polarizer, a lower glass substrate, a thin film transistor, a liquid crystal layer, an upper glass substrate, a filter, and an upper polarizer.
Optionally, the color microlens array further includes a light blocking layer located on one side of the LCD display screen, and the light blocking layer is provided with a plurality of light passing holes corresponding to the light channels respectively.
The other technical scheme of the invention is as follows: a projection device comprises a light source, a collimating mirror and the color micro-lens array which are arranged along a light path in sequence.
The invention combines the micro-lens array and the LCD display screen to form an optical system which can edit the projection pattern. The LCD display screen drives display through the driving chip and the driving chip, so that the thin film transistor controls the liquid crystal to rotate, the advancing direction of light is changed, different gray scale brightness is formed by utilizing different electric field sizes, and pictures with different colors are obtained. And superposing the display pictures of the multiple optical channels by utilizing the micro-lens array, thereby forming a required color pattern on the projection surface.
Compared with the prior art, the invention can realize the editing of the projection picture, so that the projection device can present pictures with richer colors and more rich brightness and diversified projection contents.
Drawings
FIG. 1 is a schematic structural diagram of a conventional monochromatic microlens array;
FIG. 2 is a front view of a microlens array of the present invention;
FIG. 3 is a bottom view of a microlens array of the present invention;
FIG. 4 is an enlarged view of a portion of FIG. 2 at A;
FIG. 5 is a schematic diagram of an LCD;
FIG. 6 is a light path diagram of a projection apparatus;
wherein: 11. a first microlens; 12. a photomask; 13. a transparent substrate; 14. a second microlens; 20. a microlens array; 21. a first microlens; 22. an LCD display screen; 23. a transparent substrate; 24. a second microlens; 221. a lower polarizer; 222. a lower glass substrate; 223. a thin film transistor; 224. a liquid crystal layer; 225. an upper glass substrate; 226. an optical filter; 227. an upper polarizer; 30. a light source; 31. a collimating mirror; 32. and (4) an image plane.
Detailed Description
For the purpose of illustrating the technical content, the constructional features, the achieved objects and the effects of the invention in detail, reference will be made to the following detailed description of the embodiments in conjunction with the accompanying drawings.
Referring to fig. 2 to 5, a color microlens array includes an LCD panel 22 and a plurality of first microlenses 21 and a plurality of second microlenses 24 respectively disposed on both side surfaces of the LCD panel. The first micro lens 21 is located at the light incident side of the color micro lens array, the LCD display screen 22 and the second micro lens 24 are located at the downstream of the first micro lens 21, the plurality of first micro lenses 21 and the plurality of second micro lenses 24 are distributed in an array, and each first micro lens 21 and one second micro lens 24 correspond to form a light channel. Each optical channel includes a first microlens and a second microlens. In each optical channel, the first micro lens shapes incident light and irradiates the incident light on the LCD display screen 22, images of the LCD display screen 22 are formed on the same image plane through the second micro lens 24, and the images formed by each optical channel are basically overlapped, so that a sufficiently clear and sharp image is formed. It will be readily understood by those skilled in the art that the first microlens array and/or the second microlens array may include redundant microlenses, such as redundant unit microlenses located at the edges of the microlens array that are not used for imaging, and such are within the scope of the present invention. The optical axis of the first microlens array may be, for example, parallel to the optical axis of the second microlens array, as shown in the figure.
In one embodiment of the present invention, the LCD panel 22 includes a lower polarizer 221, a lower glass substrate 222, a thin film transistor 223, a liquid crystal layer 224, an upper glass substrate 225, a filter 226, and an upper polarizer 227. The LCD display screen 22 is located on the object plane of the second microlens 24, the LCD display screen 22 has a plurality of pixel units arranged in an array, and each pixel unit includes three red, yellow and blue sub-pixels. A plurality of pixel units are respectively corresponding to each optical channel, and images formed by the optical channels are overlapped with each other.
In an embodiment of the present invention, the first microlenses 21 and the second microlenses 24 are made of a polymer material, and the plurality of first microlenses 21, the LCD panel 22, and the plurality of second microlenses 24 are integrally formed by a hot pressing process.
In order to ensure that the distances of the first micro lens, the LCD display screen and the second micro lens on the optical axis satisfy the relation of optical projection, a spacer is arranged between the first micro lens and the second micro lens, and the spacer can be formed with through holes corresponding to the light channels. The spacer may be a solid member applied to the outside of the first and second microlens arrays, such as by using a frame to separate the two microlens arrays, or, as in this embodiment, a transparent substrate 23 may be disposed between the LCD display 22 and the second lens 24. In this embodiment, the transparent substrate is a plane mirror structure as a supporting member, and the transparent substrate is made of glass or polymer material, wherein the first micro lens 21 is a convex flat lens, and the second micro lens 24 is a flat convex lens.
In other embodiments of the present invention, different optical paths may be designed according to actual situations, for example, the transparent substrate 23 may be a plane mirror, a plano-concave lens, or a plano-convex lens; the first micro lens can also be any one of a convex flat lens, a plano-convex lens, a biconvex lens, a convex-concave lens and a concave-convex lens; the second microlens can be any one of a convex plano lens, a plano-convex lens, a biconvex lens, a convex-concave lens and a concave-convex lens. These are all within the scope of the present invention. In addition, if a meniscus lens or a convex-concave lens is used, the microlens itself needs to satisfy the requirement of positive optical power.
In an embodiment of the present invention, the color microlens array further includes a light blocking layer located on one side of the LCD display screen 22, the light blocking layer is provided with a plurality of light passing holes corresponding to the light channels, and the light blocking layer is used to form a shield in the non-projection area.
The first micro lens shapes the incident light and irradiates the LCD display screen 22, the LCD display screen 22 presents a display picture under the driving of the driving circuit, the image of the LCD display screen 22 is formed on an image plane through the second micro lens, and the images formed by the plurality of optical channels are basically overlapped, so that the edge of the image formed on the image plane is sharp and clear. Because the image plane focuses of a plurality of optical channels are superposed, light beams passing through the micro lens array are superposed on an image plane medium, and the display brightness can be improved.
One embodiment shown in fig. 6 illustrates a projection device, such as a projection lamp or a pico-projector, having a housing, an optical system disposed in the housing, the optical system including a light source 30, a collimating mirror 31, and the aforementioned color microlens array 20 disposed in sequence along an optical path, and circuitry including driving circuitry for driving an LCD display and control circuitry. The light source 30 is one of an LED light source, a halogen lamp, an ultra-high pressure mercury lamp, a xenon lamp, and an incandescent lamp. The collimating lens 31 is used for adjusting the emergent light of the light source 30 into parallel light for emergent, the first microlens array of the microlens array 20 converges the incident light on the LCD display screen, the LCD display screen deflects the liquid crystal under the control of the driving signal to present different display images, the liquid crystal presents different colors under the action of the optical filter, and the light passes through the upper polarizer and then is imaged on the image plane through the second microlens. The images of the plurality of channels are substantially overlapped with each other, so that the brightness of the display screen is enhanced.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the foregoing description only for the purpose of illustrating the principles of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined by the appended claims, specification, and equivalents thereof.
Claims (7)
1. A color microlens array, comprising: including LCD display screen (22) and be located respectively LCD display screen both sides surface a plurality of first microlens (21) and a plurality of second microlens (24), each first microlens (21) correspond with a second microlens (24) respectively and form a light channel, LCD display screen (22) pixel unit that a plurality of array were arranged has, correspond respectively in each light channel a plurality of pixel unit, and a plurality of the image that the light channel becomes coincide each other.
2. The color microlens array as claimed in claim 1, wherein: a plurality of said first microlenses (21), an LCD display (22) and a plurality of second microlenses (24) are integrally formed.
3. The color microlens array as claimed in claim 1, wherein: the LCD device also comprises a transparent substrate (23), wherein the transparent substrate (23) is positioned between the second micro lens (24) and the LCD display screen (22).
4. The color microlens array as claimed in claim 1, wherein: the first micro lens (21) is a convex flat lens, and the second micro lens (24) is a flat convex lens.
5. The color microlens array as claimed in claim 1, wherein: the LCD display screen (22) comprises a lower polarizer (221), a lower glass substrate (222), a thin film transistor (223), a liquid crystal layer (224), an upper glass substrate (225), a light filter (226) and an upper polarizer (227).
6. The color microlens array as claimed in claim 1, wherein: the LCD device also comprises a light-blocking layer positioned on one side of the LCD display screen (22), and a plurality of light-passing holes corresponding to the light channels are formed in the light-blocking layer.
7. A projection device, characterized by: it comprises a light source, a collimating mirror, a color micro-lens array as claimed in claims 1-6, arranged in sequence along a light path.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011635926.XA CN114690281A (en) | 2020-12-31 | 2020-12-31 | Color microlens array and projection apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011635926.XA CN114690281A (en) | 2020-12-31 | 2020-12-31 | Color microlens array and projection apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114690281A true CN114690281A (en) | 2022-07-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011635926.XA Pending CN114690281A (en) | 2020-12-31 | 2020-12-31 | Color microlens array and projection apparatus |
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| Country | Link |
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| CN (1) | CN114690281A (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060018025A1 (en) * | 2003-01-08 | 2006-01-26 | Explay Ltd. | Image projecting device and method |
| US7012755B1 (en) * | 2003-02-14 | 2006-03-14 | Lightmaster Systems, Inc. | Use of a lens array to increase the contrast ratio produced by a LCoS microdisplay |
| CN101937133A (en) * | 2009-06-26 | 2011-01-05 | 松下电器产业株式会社 | Projecting display |
| CN106415389A (en) * | 2014-06-12 | 2017-02-15 | X开发有限责任公司 | High contrast rear projection screen for use with divergent illumination sources |
| CN109270779A (en) * | 2018-11-27 | 2019-01-25 | 深圳市微阵技术有限公司 | Novel dynamic image projection system |
| CN111211117A (en) * | 2020-01-08 | 2020-05-29 | 武汉华星光电技术有限公司 | Display panel and preparation method thereof |
| CN111367136A (en) * | 2020-02-15 | 2020-07-03 | 江西微瑞光学有限公司 | Multi-channel projection optical assembly, multi-channel projection device and projection method |
| CN111856851A (en) * | 2020-08-12 | 2020-10-30 | 广东烨嘉光电科技股份有限公司 | Projection system of composite micro lens and micro prism |
| CN213633886U (en) * | 2020-12-31 | 2021-07-06 | 苏州晶方光电科技有限公司 | Color microlens array and projection apparatus |
-
2020
- 2020-12-31 CN CN202011635926.XA patent/CN114690281A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060018025A1 (en) * | 2003-01-08 | 2006-01-26 | Explay Ltd. | Image projecting device and method |
| US7012755B1 (en) * | 2003-02-14 | 2006-03-14 | Lightmaster Systems, Inc. | Use of a lens array to increase the contrast ratio produced by a LCoS microdisplay |
| CN101937133A (en) * | 2009-06-26 | 2011-01-05 | 松下电器产业株式会社 | Projecting display |
| CN106415389A (en) * | 2014-06-12 | 2017-02-15 | X开发有限责任公司 | High contrast rear projection screen for use with divergent illumination sources |
| CN109270779A (en) * | 2018-11-27 | 2019-01-25 | 深圳市微阵技术有限公司 | Novel dynamic image projection system |
| CN111211117A (en) * | 2020-01-08 | 2020-05-29 | 武汉华星光电技术有限公司 | Display panel and preparation method thereof |
| CN111367136A (en) * | 2020-02-15 | 2020-07-03 | 江西微瑞光学有限公司 | Multi-channel projection optical assembly, multi-channel projection device and projection method |
| CN111856851A (en) * | 2020-08-12 | 2020-10-30 | 广东烨嘉光电科技股份有限公司 | Projection system of composite micro lens and micro prism |
| CN213633886U (en) * | 2020-12-31 | 2021-07-06 | 苏州晶方光电科技有限公司 | Color microlens array and projection apparatus |
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