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Gray scale control method and optical projection system

A technology of grayscale control and optical projection, which is applied in the field of optical projection systems, can solve the problems of reducing total brightness and limit

Active Publication Date: 2016-03-09
DELTA ELECTRONICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method reduces the overall brightness by making the light source change brightness in accordance with the switching times of the light modulator
Furthermore, fast switching of light sources has its physical limit in essence

Method used

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  • Gray scale control method and optical projection system
  • Gray scale control method and optical projection system
  • Gray scale control method and optical projection system

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Embodiment Construction

[0031] figure 1 is a schematic diagram of forming gray scales by modulating the light modulator. When using pulse width modulation to control the switching of the light modulator to modulate the gray scale, traditional methods such as figure 1 As shown, the horizontal axis represents time, and the numbers represent the switching timing of the light modulator; the vertical axis represents brightness, in figure 1 The medium brightness is fixed at the maximum brightness of the light source, but according to whether the light modulator is turned on or off, the light modulator can selectively switch whether to output the light of the light source, so the unit period of each switching can output 0 gray scale or 1 gray scale.

[0032] exist figure 1 , input an 8-bit grayscale signal to the light modulator, and the light modulator must generate any grayscale value among 256 (=28) grayscales within a specified display period. The generation method of the gray scale depends on the co...

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Abstract

The invention discloses a gray scale control method and an optical projection system. A total gray scale is input in a total period by the method; the method comprises the following steps: dividing the total period into M unit periods; selectively outputting a 0 gray scale or a selected gray scale in each unit period; integrating the output gray scales in the M unit periods into the total gray scale, wherein the selected gray scale in continuous N unit periods of the M unit periods is a first gray scale, and the selected gray scale in (M-N) unit periods except the continuous N unit periods is inferior to the first gray scale.

Description

technical field [0001] The present invention relates to a grayscale control method and an optical projection system, and in particular to a grayscale control method and an optical projection system capable of effectively utilizing the bandwidth of a light modulator, improving total brightness, and reducing light source switching frequency. Background technique [0002] There is a technology in the projector that uses pulse width modulation (PulseWidthModulation, PWM) to control the switching times of the light modulator (for example, digital micromirror device, DigitalMicromirrorDevice), so as to form the grayscale technology of the projected image. Since the naked-view stereo projector is an important direction of projector development at present, when the naked-view stereo projector uses multiple light sources and outputs images of different viewing areas in a time-divided manner, the number of viewing areas to be displayed in the same display period will decrease. Proport...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03B21/14G03B21/00
CPCG03B21/2053
Inventor 王裕昌
Owner DELTA ELECTRONICS INC