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Projection type video reproducing apparatus

A technology for reproducing equipment and video, applied in the direction of using projection device image reproducer, TV, color TV, etc., can solve the problems of reduced efficiency, no light intensity, etc.

Inactive Publication Date: 2006-09-06
YAMAHA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, since one LED has no light intensity greater than several lumens even in the case where the LED is a high-brightness LED, it is necessary to use hundreds or thousands of LEDs in large numbers.
There is a problem that the efficiency decreases at the stage of concentrating the light emitted from the LED

Method used

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  • Projection type video reproducing apparatus
  • Projection type video reproducing apparatus
  • Projection type video reproducing apparatus

Examples

Experimental program
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Embodiment Construction

[0047] I. Description of device configuration

[0048] A projection type video reproducing apparatus (projector) according to an embodiment of the present invention will be described with reference to the drawings. The projection type video reproducing apparatus causes a display device such as a digital mirror device to display a video, and causes an LED light source to apply light to the video to project the video on a screen.

[0049] figure 1 is a block diagram of a projection type video reproducing device. The projection type video reproducing apparatus includes: a display device 5 for visualizing a video signal; a light source 4 for applying projection light to the display device 5; a condensing optical system 6 for guiding light from the light source 4 to the display device 5 and the projection optical system 7, by which the video displayed on the display device is projected onto the screen. The projection type video reproducing apparatus further includes: a display ...

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Abstract

A projection type video reproducing apparatus includes a video display element that visualizes a video signal, a video display element drive circuit that drives the video display element, a high-speed response light source that applies projection light onto the video display element, a light source drive circuit that turns the light source on, and a video signal conversion portion. The video signal conversion portion executes: a peak detection process for detecting peak values of luminance of the video signal at intervals of a unit time; a conversion coefficient calculation process for calculating a conversion coefficient based on a ratio of each detected peak value to an upper limit of the luminance or based on a difference between each detected peak value and an upper limit of the luminance; a video signal conversion process for converting the luminance value of the video signal in the unit time based on the conversion coefficient so as to increase the luminance value and supplying the luminance value to the video display element drive circuit; and a light intensity control process for setting a control value based on the conversion coefficient to reduce the light intensity of the light source and controlling the light source drive circuit in accordance with the control value.

Description

technical field [0001] The present invention relates to a projection type video reproduction device for enlarging and projecting video onto a screen. Background technique [0002] As a device for enlarging and reproducing video, a projector is known. A projector is a device equipped with an optical system through which a video is projected onto a screen provided on a wall surface. Rear projection type devices have also been implemented. That is, a rear projection type device is equipped with a housing having a front surface providing a screen so that video is projected onto the screen from the rear inside the housing. [0003] Since strong projection light is required, light sources such as mercury lamps or halogen lamps have hitherto been used in such projection-type video reproducing apparatuses (for example, JP-A-2004-264668). [0004] However, light sources such as mercury lamps or halogen lamps have the following disadvantages. That is, since light emission immediat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/74H04N9/31
Inventor 荻田实
Owner YAMAHA CORP
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