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Rear-projection display device

A display device and projection type technology, which can be applied to projection devices, image reproducers using projection devices, projectors with built-in screens/external screens, etc., can solve the problems of increased manufacturing costs of display devices and overall large-scale display devices, etc.

Inactive Publication Date: 2004-09-08
SEIKO EPSON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since it is necessary to guide the light emitted by the two lamps to the prisms and reflectors used in the light modulation device and the projection optical system, respectively, there is an increase in the manufacturing cost of the display device caused by the cost of these components, and the display device as a Overall large-scale problem

Method used

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  • Rear-projection display device

Examples

Experimental program
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Embodiment Construction

[0015] Hereinafter, preferred embodiments of the rear projection display device of the present invention will be described with reference to the drawings.

[0016] figure 1 The shown television device 1 is an example of the rear projection display device of the present invention, and has: a lamp driver 2, a light source lamp 3, a liquid crystal light valve 4, a projection lens 5, a screen 6, a TV tuner 7, a display control unit 8, The light valve driving unit 9, the sound control unit 10, the amplifier 11, the speaker 12, the auxiliary lamp driving circuit 13, the auxiliary lamp 13a, and the main control unit 14 constitute a structure capable of displaying various display screens. In addition, the television device 1 also includes a power supply unit, an operation unit (power switch, channel selection buttons, etc.), a remote controller, a video signal input unit, and the like, which are not shown in the figure.

[0017] The lamp driver 2 controls lighting (start of energizat...

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Abstract

A rear projection display is provided which can clearly display a display screen and enable positive recognition of acceptance of operation of a power switch while preventing increases in manufacturing costs and size of the display. A liquid crystal light valve modulates light emitted from a light source lamp to light for displaying a displayed on a screen. An auxiliary lamp higher in a rate of increase in luminance at start of illumination than the source lamp is arranged such that light from the auxiliary lamp can reach a rear surface side of the screen without passing through the liquid crystal light valve. A main control section causes the light source lamp and the auxiliary lamp to both illuminate at power on, and the auxiliary lamp to extinguish before luminance of the source lamp becomes high enough to cause the display screen to be displayed by projection.

Description

technical field [0001] The present invention relates to a rear projection type (rear transmission type) display device that modulates light emitted from a light source lamp to display a display screen on a screen. Background technique [0002] As such a rear projection display device, the applicant discloses a rear projection display device 10 in Japanese Unexamined Patent Application Publication No. 2002-139794. The rear projection display device has: a light generating unit 20 that has a light source 21 composed of a high-pressure mercury lamp or a metal halide lamp and emits red light, green light, and blue light; modulation means 30R, 30G, 30B; projection optical systems 40R, 40G, 40B constituted by lenses etc. for amplifying the light modulated by the light modulation means; reflective mirror 51 reflecting the light amplified by the projection optical system , 52; and a rear projection screen 60 capable of receiving light reflected by the reflector and projecting and d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03B21/14G03B21/20
CPCG03B21/2053G03B21/10G03B21/2093G03B21/2013G03B21/20
Inventor 木村佳司
Owner SEIKO EPSON CORP