CN213715489U

CN213715489U - Color microlens array and optical projection module

Info

Publication number: CN213715489U
Application number: CN202023320725.9U
Authority: CN
Inventors: 万佳
Original assignee: Suzhou Jingfang Photoelectric Technology Co ltd
Current assignee: Suzhou Jingfang Photoelectric Technology Co ltd
Priority date: 2020-12-31
Filing date: 2020-12-31
Publication date: 2021-07-16
Anticipated expiration: 2030-12-31

Abstract

The utility model relates to a colored microlens array and projection arrangement, include the OLED display screen and be located respectively a plurality of first microlenses and a plurality of second microlenses on OLED display screen both sides surface, each first microlens corresponds with a second microlens respectively and forms a light channel, and the OLED display screen has the pixel unit that a plurality of array was arranged, corresponds respectively in each light channel and has a plurality of pixel unit, and a plurality of the image that light channel becomes coincide each other. The utility model discloses a combine microlens array and OLED display screen, make its optical system that forms projection pattern and can edit, the OLED display screen passes through driver chip and driver chip drive and shows, utilizes different electric field size, forms different grey scale luminance to obtain the picture of different colors, recycle microlens array with the display frame coincidence of a plurality of light passageways, thereby form required colored pattern on the plane of projection.

Description

Color microlens array and optical projection module

Technical Field

The utility model belongs to the technical field of the optical projection, in particular to optical projection subassembly of colored microlens array and applied microlens array technique.

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 needing projection, forms a single-form and less-color-change (1-2 colors) projection pattern on the ground through the light penetrating through the mask, and cannot meet the diversified demands of the market.

SUMMERY OF THE UTILITY MODEL

In order to solve the above technical problem, an object of the present invention is to provide a color optical projection apparatus with rich projection colors and changeable and editable contents.

In order to realize the purpose of the utility model, the utility model adopts the following technical scheme: the utility model provides a colored microlens array, includes OLED display screen and is located respectively OLED 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, OLED display screen have the pixel unit that a plurality of array was arranged, correspond respectively in each light channel and have a plurality of the pixel unit, and be a plurality of the image that light channel becomes coincide each other.

In the above technical solution, preferably, a plurality of the first microlenses, the OLED display 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 OLED display screen.

Optionally, the first microlens is a convex plano lens, and the second microlens is a plano-convex lens.

Optionally, the color microlens array further includes a light blocking layer located on one side of the OLED display screen, and the light blocking layer is provided with a plurality of light passing holes corresponding to the light channels respectively.

The utility model discloses another technical scheme is: 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 utility model discloses a combine microlens array and OLED display screen, make it form the optical system that the projection pattern can be edited. The OLED display screen is driven to display through the driving chip and the driving chip, and therefore different object plane patterns to be projected are presented. 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 utility model discloses can realize the edition to the projection picture, make projection arrangement can present the color light and shade abundanter, the diversified picture of projection content.

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 the 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 structural diagram of an OLED display screen;

FIG. 6 is an optical diagram of an optical projection assembly;

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 OLED display screen; 23. a transparent substrate; 24. a second microlens; 30. a light source; 31. a collimating mirror; 32. an image plane; 221. a cathode metal layer; 222. an emission layer; 223. a conductive layer; 224. an anode metal layer; 225. a transparent substrate.

Detailed Description

To explain the technical content, structural features, achieved objects and functions of the present invention in detail, the following detailed description is made with reference to the accompanying drawings.

Referring to fig. 2 to 5, a color microlens array includes an OLED display panel 22 and a plurality of first microlenses 21 and a plurality of second microlenses 24 respectively disposed on both side surfaces of the OLED display panel. The first micro lens 21 is located at the light incident side of the color micro lens array, the OLED 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 light on the OLED display screen 22, images of the OLED 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.

In an embodiment of the present invention, the OLED display 22 includes a transparent substrate 225, an anode metal layer 224, a conductive layer 223, an emission layer 222, a cathode metal layer 221, an encapsulation layer, and the like, which are sequentially stacked through a semiconductor process. Under the action of the driving circuit, a plurality of pixel points on the emitting layer can be controlled to emit light, so that different colors or patterns can be presented. The OLED display 22 is transparent as a whole and allows light from the light source side to penetrate through and enter the second micro-lenses. The utility model discloses can adopt any one kind of ordinary OLED display screen 22 of market, as long as satisfy the whole printing opacity of OLED can, consequently do not give unnecessary details to this in this specification. The OLED display screen 22 is located on the object plane of the second microlens 24, the OLED 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 a plurality of the first microlenses 21, the OLED display 22 and the second microlenses 24 are integrally formed by heat pressing.

In order to ensure that the distances among the first micro lens, the OLED 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 all the optical channels. The spacer may be a solid member applied to the outside of the first and second microlens arrays, such as a frame, or a transparent substrate 23 may be disposed between the OLED display 22 and the second lens 24, as in this embodiment. 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 light 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 OLED 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 block the light in the non-projection area.

The first micro lens shapes incident light and irradiates the OLED display screen 22, the OLED display screen 22 presents a display picture under the driving of the driving circuit, the image of the OLED 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 an optical projection assembly, 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 OLED display screen 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 to be parallel light for emergence, the first microlens array of the microlens array 20 converges the incident light on the OLED display screen, the OLED display screen emits light and presents different display images under the control of a driving signal, and the light is imaged on an 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 given by way of illustration only, and that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims, specification and equivalents thereof.

Claims

1. A color microlens array, comprising: including OLED display screen (22) and be located respectively OLED 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, OLED 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: the first microlenses (21), the OLED display screen (22) and the second microlenses (24) are integrally formed.

3. The color microlens array as claimed in claim 1, wherein: the OLED display screen also comprises a transparent substrate (23), and the transparent substrate (23) is located between the second micro lens (24) and the OLED 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 OLED display screen also comprises a light blocking layer positioned on one side of the OLED display screen (22), and a plurality of light through holes respectively corresponding to the light channels are formed in the light blocking layer.

6. An optical projection assembly, comprising: it comprises a light source, a collimating mirror, a color micro-lens array as claimed in claims 1-5, arranged in sequence along a light path.