Diaphragm control circuit, projector device, diaphragm control program, and diaphragm control method

A technology of control circuits and control programs, applied in projection devices, optics, electrical components, etc., can solve problems such as difficulty in ensuring contrast

Inactive Publication Date: 2012-05-23
NEC DISPLAY SOLUTIONS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is difficult to ensure the necessary contrast ratio only by the modulation rate of the light modulation element

Method used

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  • Diaphragm control circuit, projector device, diaphragm control program, and diaphragm control method
  • Diaphragm control circuit, projector device, diaphragm control program, and diaphragm control method
  • Diaphragm control circuit, projector device, diaphragm control program, and diaphragm control method

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Embodiment Construction

[0017] A projection device according to an embodiment of the present invention will be described below with reference to the drawings.

[0018] figure 1 It is a schematic block diagram of the projection device of this embodiment. The projection device 100 receives a video signal from the connected video output device 200 , and modulates the intensity of output light based on the input video signal.

[0019] The projection device 100 shown in this figure includes a light source 110 , an aperture unit 120 , a spatial light modulator 130 , a projection lens 140 , an image processing unit 150 , and an aperture driving unit 160 .

[0020] The light source 110 is a light source that outputs light projected from the projection device 100 , and is, for example, a lamp, an LED (Light Emitting Diode), or the like. The aperture unit 120 shields a part of the optical path of the light output from the light source 110, and adjusts the amount of light from the light source. The aperture ...

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PUM

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Abstract

A video processing unit (150) has a diaphragm control unit (155) which uses a diaphragm (121) to limit the light quantity outputted in accordance with information indicating the brightness of the inputted video signal. Here, the diaphragm control unit (155) controls the open degree of the diaphragm (121) in accordance with a difference between the open degree of the diaphragm (121) detected by a diaphragm drive unit (160) which detects the open degree of the diaphragm (121) and a target open degree of the diaphragm (121) based on the information indicating the brightness of the inputted video signal.

Description

technical field [0001] The invention relates to an aperture control circuit, a projection device, an aperture control program and an aperture control method for controlling the output light quantity according to an input image signal. Background technique [0002] In the projection device, the amount of light from a light source is modulated according to an input video signal using a light modulation element, and the output light amount is changed to display an image based on the video signal. It is difficult to ensure the necessary contrast only by the light modulation rate of the light modulation element. In order to supplement the insufficient modulation rate of light and improve contrast, there is a technique of controlling the amount of light input to or output from the light modulation element. Control of the amount of light is realized by an optical system combining a lens and a diaphragm, and a control unit that adjusts the aperture ratio of the diaphragm (for examp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03B21/14G03B21/00
CPCG03B21/2053G03B21/14H04N9/3155
Inventor 森本健
Owner NEC DISPLAY SOLUTIONS LTD
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