Liquid crystal video projector

Claim 2

A liquid crystal video projector comprising: an input unit (120) for inputting operating commands, a non-lighting detector (210) for detecting non-ligh­ting of a projection light source, a temperature detector (211) for detecting the tempe­rature within said liquid crystal video projector, cooling means (240, 245) for cooling the interior of the liquid crystal video projector, display means (130) for displaying status information of the liquid crystal video projector, alarm means (140) for giving alarm in case of a an abnormal status, electric power supply means, storage means (250) for storing status information of the liquid crystal video projector, and command and status processing means (100) for con­trolling the projection light source, the cooling means, the display means and the alarm means on the basis of com­mands inputted from said input unit (120) and signals from said non-lighting detector (210) and said temperature de­tector (211).

Claim 3

A liquid crystal video projector according to claim 1, comprising: input means (1) for detecting commands inputted by said input unit (120), command discriminating means (2) for outputting a command signal after discriminating an operating status on the basis of an output from said input means (1), non-lighting detection means (10) for outputting a projection light source non-lighting signal in response to a signal transmitted from said non-lighting detector (210), temperature detection means (20) for outputting a temperature information signal in response to a signal transmitted from said temperature detector (211), power supply control means (3) controlled on the basis of the command signal from said command discrimina­ting means (2), said projection light source non-lighting signal and said temperature information signal, a main power supply control unit (220) for effecting on/off control of electric power supply to a main power supply (300) in response to the output signal from said po­wer supply control means (3), a light source power supply control unit (221) for effecting on/off control of electric power supply to a light source power supply (301) in response to the output signal from said power supply control means (3), fan motor (245) having a variable rotational speed, for cooling the interior of said liquid crystal video pro­jector, fan motor control means (8) for controlling the operation of said fan motor (245) on the basis of an output from said power supply control means (3), a fan motor control unit (240) for controlling said fan motor (245) in response to an output signal from said fan motor control means (8), alarm issuing means (30) for issuing an alarm signal on the basis of an output from said power supply control means (3), an alarm unit (140) driven by the alarm signal from said alarm issuing means (30), input changeover control means (4) for changing over an input signal source in accordance with the command sig­nal from said command discriminating means (2), an input changeover unit (230) controlled by an out­put signal from said input changeover control means (30), picture processing means (5) for controlling a pic­ture on the basis of said command signal from said command discriminating means (2), voice processing means (6) for controlling the sound volume on the basis of said command signal from said command judging means (2), a D/A converter (270) controlled by the output sig­nals from said picture processing means (5) and said voice processing means (6), lens control means (7) for controlling a projection lens mechanism on the basis of said command signal from said command judging means (2), a lens control unit (260) for controlling said pro­jection lens mechanism in accordance with an output signal from said lens control means (7), a storage unit (250) for storing information dealt with by said power supply control means (3) said input changeover means (4), said picture processing means (5) and said voice processing means (6), display control means (9) for controlling a display of an operating status of said liquid crystal video projec­tor on the basis of outputs from said power supply control means (3), said input changeover means (4), said picture processor means (5), said voice processor means (6) and said lens control means (7), a display unit (130) controlled by an output signal from said display control means (9) and timer means (50) for effecting time control of said respective means.

Claim 4

The liquid crystal video projector according to claims 1 or 2, wherein said storage unit (250) is adapted to hold the stored data even if the electric power to said liquid crystal video projector is cut off.

Claim 5

The liquid crystal video projector according to claim 1, wherein said command and status processing means (100) is formed by a program controlled microcomputer.

Claim 6

The liquid crystal video projector according to any of the preceding claims, wherein said input unit (120) includes a remote control receiving means (200).