Automatic backlight on/off control apparatus for liquid crystal

Details Automatic backlight on/off control apparatus for liquid crystal Automatic backlight on/off control apparatus for liquid crystal

1990-06-21

1992-01-07

Miller, Stanley D.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

340814, 358236, 307 38, 359 85, G02F 113, H04N 574

Patent

active

050784765

ABSTRACT:
An automatic backlight on/off control apparatus for use in a liquid crystal display television includes a buffer amplifier, a synchronizing signal detector, a switching controller, and a backlight power controller for preventing electric power consumed unnecessarily by turning the backlight off in case there is no input of any video signal and turning the backlight on according to the pulse signal of a pulse generating member only in case there is a video signal input.

REFERENCES:
patent: 4758799 (1988-07-01), Ho et al.
patent: 4792857 (1988-12-01), Akiyama
patent: 4848876 (1989-07-01), Yamakawa
patent: 4985638 (1991-01-01), Brock
patent: 4985662 (1991-01-01), Willcocks et al.
patent: 5006933 (1991-04-01), Suzuki et al.

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