A video image color compensation method and device based on digitally controlled optical filter

Abstract

The invention discloses a video image color compensation method and device based on a numerically controlled optical filter. The device includes a digital micromirror drive board, a digital micromirror device DMD, a numerically controlled optical filter, and a UHP lamp as a light source. The digital micromirror drives The board includes Field Programmable Gate Array FPGA and microcontroller ARM, among them, FPGA is the core processor of the system, used to realize color compensation, and finally drive the digital micromirror device DMD. The microcontroller ARM is used to drive the numerically controlled optical filter to ensure its high-speed rotation; the light source UHP lamp is the light source of the digital micromirror device DMD, and the numerically controlled optical filter is used as the color filter of the light source. The white light emitted by the light source at each moment is only Monochromatic light can shine on the DMD through digitally controlled light filters. The invention proposes a color compensation method and device aiming at the filtering distortion existing in the digitally controlled optical filter itself, which enhances the color restoration of video image display.

Description

technical field [0001] The invention relates to the technical field of optical filter processing, in particular to a video image color compensation method and device based on a numerically controlled optical filter. Background technique [0002] An optical filter is an instrument used for wavelength selection, which can select the desired wavelength from many wavelengths and reject light other than this wavelength. Any technology that can select light can be used to manufacture optical filters in principle, so there are many forms of optical filters. In digital light processing (DLP) display technology, it is necessary to use optical filters to complete the separation and processing of colors, so as to realize color projection display. Here, a color filter is used to realize the optical filter, which can accurately select the small-range band of light waves to pass, and reflect other bands that do not want to pass through. Usually, the color filter is installed in front of...

AI Technical Summary

Problems solved by technology

[0004] Because in the single-chip DMD projection system, only one light filtering process is performed at the same time, and only one color of light passes through each time, so it will bring some loss of brightness

At the same time, due to the differences in the inherent characteristics of the spectral wavelength of different colors of light, there are differences in color reproduction.

In the actual color filter, due to process problems, each color cannot be evenly distributed and perfectly transitioned to the next color, which makes the color reproduction distorted. This phenomenon is most obvious when the filter turns to the edge of each color

Due to the color distortion of the optical filter itself, the color of the entire projection device is distorted, which greatly reduces the color reproduction of the projection device

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