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projection display device

A display device, projection technology, applied in projection devices, televisions, optics, etc., can solve problems such as damage to contrast, and achieve the effect of improving the sense of contrast

Active Publication Date: 2015-10-21
SANYO ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, with such a configuration, even when the image is a moving image, it becomes unnecessary to impair the sense of contrast.

Method used

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[0081] Image 6 It is a schematic diagram for explaining a modified example of aperture control for moving images.

[0082] In the above embodiments, in the case where the projected image is a moving image, as Figure 4 As shown in (a), the iris 205 is operated from the fully open state to the fully closed state.

[0083] On the other hand, in this modified example, when the projected image is a moving image, as in Image 6 As shown, the operating range of the iris 205 is restricted. That is, the operating range of the iris 205 is reduced compared to the case where the projected image is a still image.

[0084] Therefore, in this modified example, a video table 406 a different from that in the above-described embodiment is stored in the memory 406 . In the moving image table 406a of this modified example, the relationship between the APL and the opening amount of the iris 205 becomes as follows: Image 6 In the form of the relationship as shown, the control amount of the ...

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Abstract

A projection display device includes: an aperture part which narrows light traveling toward an imager; a control part which controls the aperture part; a detection part which detects brightness of an image to be projected; and a determination part which determines whether the image is a still image or a moving image. In this arrangement, the control part operates the aperture part so as to narrow the light when the brightness of the image detected by the detection part is darker than predetermined brightness, and operates the aperture part so as to further narrow the light when the brightness of the image detected by the detection part becomes darker than the predetermined brightness. In addition, the control part sets the predetermined brightness for operating the aperture part so as to be darker when the image is the still image than when the image is the moving image.

Description

technical field [0001] The present invention relates to a projection display device that modulates light from a light source and projects it onto a projected surface. Background technique [0002] A projection display device (hereinafter referred to as "projector") modulates light from a light source with a light modulation element, and projects the modulated light (hereinafter referred to as "image light") onto a projected surface. [0003] In such a projector, in order to improve the sense of contrast, it is possible to adopt a configuration in which the amount of light irradiated on the light modulation element is adjusted according to the brightness of an image projected on the projection surface. For example, an aperture device that changes the size of the opening (hereinafter referred to as "aperture amount") is arranged in the optical path from the light source to the light modulation element. The screen average luminance (APL: average picture level) is obtained from...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03B21/00G03B21/14H04N5/74
CPCH04N9/3155G03B21/2053H04N9/3194
Inventor 山下孝雄内山正裕连昭雄
Owner SANYO ELECTRIC CO LTD