CN104570331A - Method for improving resolution of DMD (digital micro-mirror device) by means of optical assembling - Google Patents

Abstract

The invention discloses a method for improving the resolution of a DMD based on an optical splicing method. The steps are as follows: 1. The computer providing the signal source divides the 4K×4K image received by the required detector into 4K×2K, 4K× 2K two parts; 2. Send the two parts of the signal to the DMD control chip part through a synchronous trigger output signal, and the DMD control chip will transmit two 4K×2K images to the two DMD chips at the same time after signal processing; 3. Two After the image generated in a DMD chip passes through the collimating optical system, the parallel light is incident perpendicular to the optical splicing part, and after the adjustment of the spatial position, the splicing of the edge of the image plane is realized, and the resolution display of 4K×4K is achieved. This method can break through the limitation of the research and development cycle of the spatial light modulator, improve the accuracy of the target simulator, speed up the research and development efficiency, and effectively save time.

Description

A method for improving the resolution of DMD based on optical stitching

technical field

The invention relates to a method for improving the resolution of a DMD, in particular to a method for improving the resolution of a DMD based on an optical splicing means.

Background technique

The development of modern science and technology has higher requirements for optical information processing methods. The original various modulators can no longer meet the requirements, and sensors capable of real-time two-dimensional input and output have emerged as the times require, which is the spatial light modulator.

Digital micromirror device (DMD) is a new type of all-digital spatial light modulator, which uses a pin sputtering process to form a two-dimensional micromirror array on a semiconductor silicon wafer. Each microlens is equivalent to a pixel in the projection screen, and each microlens can be deflected freely. Different deflection angles of the microlens will present different states. Therefore, the reflection of light is controlled by the deflection angle of each microlens, thereby realizing real-time display of images. However, the improvement of DMD resolution is limited by the processing technology. In the design process of the target simulator based on the DMD chip, if the target accuracy we need to simulate is greater than the resolution limit that the DMD can provide at the moment, it will take a long time to improve the resolution of the DMD only by improving the processing technology. long time.

It is not easy to break through the limitation of the spatial light modulator (DMD) resolution. A high-resolution spatial modulator can improve the simulation accuracy of the target simulator, and has great application value. Therefore, improving the accuracy of the target simulator can improve the simulation method, thereby making the simulation experiment more accurate and reducing the research and development cost.

Contents of the invention

The purpose of the present invention is to provide a method for improving the resolution of DMD based on optical splicing means, which can break through the limitation of the research and development cycle of the spatial light modulator, improve the accuracy of the target simulator, speed up the research and development efficiency, and effectively save time.

The purpose of the present invention is achieved through the following technical solutions:

A method for improving the resolution of a DMD based on optical splicing means, comprising the steps of:

1. The computer that provides the signal source divides the 4K×4K image received by the required detector into two parts: 4K×2K and 4K×2K;

2. Send the two parts of the signal to the DMD control chip part through a synchronous trigger output signal. The DMD control chip undergoes signal processing and transmits two 4K×2K images to the two DMD chips at the same time;

3. After the images generated in the two DMD chips pass through the collimating optical system, the parallel light is incident perpendicular to the optical splicing part. After the adjustment of the spatial position, the splicing of the edge of the image plane is realized, and the resolution display of 4K×4K is achieved;

4. After the optical splicing part, the image is imaged on the CCD camera.

The present invention has the following advantages:

The present invention can make the spatial light modulator break through the limitation of the research and development cycle to improve the resolution, and can also use this method to realize the splicing of the low-resolution spatial light modulation when the high-resolution spatial light modulator cannot be purchased due to the limitation of funds , resulting in a higher resolution.

Description of drawings

Figure 1 is a schematic diagram of the visible light target simulator system;

FIG. 2 is a structural diagram of an optical splicing and alignment module;

Figure 3 is a schematic diagram of the splicing module of the optical system;

Figure 4 is a flow chart of specific operations.

Detailed ways

The technical solution of the present invention will be further described below in conjunction with the accompanying drawings, but it is not limited thereto. Any modification or equivalent replacement of the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention should be covered by the present invention. within the scope of protection.

Specific implementation mode 1: This implementation mode provides a method for improving the resolution of DMD based on optical splicing means, and the specific implementation steps are as follows:

1. The computer that provides the signal source divides the 4K×4K image received by the required detector into two parts: 4K×2K and 4K×2K.

2. Send the two parts of the signal to the DMD control chip part through a synchronous trigger output signal. The DMD control chip undergoes signal processing and transmits two 4K×2K images to the two DMD chip parts at the same time.

3. Due to the limitation of DMD's own resolution, it cannot break through the limit of 4K×2K, but the image display of 4K×4K can be realized through the optical splicing part. The images (4K×2K) generated by the two DMD chips can be paralleled after passing through the collimating optical system. The parallel light output can not change the size of the image surface, so that the image surface only drops in energy after passing through the optical splicing part. The deformation of the image plane is caused. The images produced by the DMD of the two image planes pass through the optical splicing part and adjust the spatial position to realize the splicing of the edge of the image plane. After precise adjustment, the edge can be within one pixel (10.8μm), Reach 4K×4K resolution display.

4. After the optical splicing part, the image is imaged on the CCD camera. The CCD camera and the DMD control chip share the same trigger signal. When the DMD control chip transmits the image, the CCD camera starts to receive the image.

In this embodiment, the optical splicing part is a semi-reflective and semi-transparent cubic prism, which is formed by gluing two pieces of isosceles right-angled triangular prism optical glass of the same material, and a semi-reflective and semi-transparent film is coated on the glued surface. The reflectance and transmittance of the visible light part are 50% respectively.

In this embodiment, the material of the optical glass may be common glass such as K9 and BK7.

Specific Embodiment 2: In this embodiment, the technical solution of the present invention is described in detail by taking the target simulator as an example.

As shown in Figure 1, the analog simulation system generates an analog target source and transmits it to the DMD chip. The DMD control circuit controls the DMD chip to generate images. The lighting system provides lighting for the DMD chip. The DMD chip generates high-resolution images after passing through the projection optical system. The image is the target to be simulated. As shown in Figure 2-4, the specific imaging steps are as follows:

The simulation computer provides a high-resolution image (4K×4K) to the DMD driver module. The resolution of the image is higher than the intrinsic resolution of the DMD (4K×2K). After processing by the DMD control chip, the DMD1 chip and The DMD2 chips respectively display one-half of the original image, and the DMD1 chip and the DMD2 chip work at the same time through the DMD driver module, and the microlens array is turned over at the same time. At the same time, the LED driver module drives the lighting system to start working. After the DMD1 chip and the DMD2 chip are turned over, they are illuminated by the lighting system to generate an image. The reflective image is generated by the transflective film. The image emitted from the DMD1 chip passes through the collimating optical system and enters the optical splicing module with parallel light. The transmissive image is generated through the semi-reflective and transflective film. After mechanical adjustment and calibration, the reflected image and the transmissive image Images are stitched together with edges blended to within a single pixel. After the optical splicing part, the image is imaged on the CCD camera. The CCD camera and the DMD control chip share the same trigger signal. When the DMD control chip transmits the image, the CCD camera starts to receive the image. After the CCD receiving module judges that the splicing is successful, there will be no gaps in the successfully spliced images, and the real seamless splicing is realized, that is, the images formed by the two DMDs through the splicing system are aligned within one pixel.

Claims (5)

1. the method that the resolution realizing DMD based on optic splice means improves, is characterized in that described method step is as follows:

The image of the 4K × 4K one, providing the computing machine of signal source to be received by required detector is divided into 4K × 2K, 4K × 2K two parts;

Two, two parts of signals is sent to DMD control chip part by a synchronous trigger output signal, the image of two width 4K × 2K, through signal transacting, is transferred in two pieces of dmd chips by DMD control chip simultaneously;

Three, the image produced in two pieces of dmd chips is after collimating optical system, and directional light, perpendicular to optic splice portions incident, through the adjustment of locus, realizes the splicing at image planes edge, reaches the resolution display of 4K × 4K.

2. the method realizing the resolution raising of DMD based on optic splice means according to claim 1, it is characterized in that described optic splice part is a half-reflection and half-transmission cube prism of being glued together by the isosceles right-angle prismatic column type optical glass of two pieces of identical materials, cemented surface is coated with part reflective semitransparent film.

3. the method that improves of the resolution realizing DMD based on optic splice means according to claim 2, is characterized in that described part reflective semitransparent film is respectively 50% to the reflectivity of visible light part, transmissivity.

4. the method realizing the resolution raising of DMD based on optic splice means according to claim 2, is characterized in that the material of described optical glass is K9 or BK7.

5. the method realizing the resolution raising of DMD based on optic splice means according to claim 1, is characterized in that described splicing imaging is aligned in a pixel.