METHOD FOR CONTROLLING PICTURE SIZE OF LIQUID CRYSTAL PROJECTOR

Title:

METHOD FOR CONTROLLING PICTURE SIZE OF LIQUID CRYSTAL PROJECTOR

Document Type and Number:

Japanese Patent JP3447798

Kind Code:

B2

Abstract:

PURPOSE: To gradually increase the size of a picture appearing on a screen in accordance with the light emission quantity of a lamp until the light emission quantity of the lamp becomes normal after turning on a power supply and to remove a picture while gradually reducing the size of the picture on the screen when the power supply is turned off by judging the ON/OFF state of an inputted power supply key.
CONSTITUTION: A control part 121 judges whether the depressed power supply key is in an ON state or not, and at the time of ON, initializes a register 123 to turn on a lamp power supply relay and a main power supply relay. At the time of judging that a value temporarily stored in the register 123 is not the same as a value determined by a user and stored in a storage part 122, the stored value of the register 123 is increased only by a prescribed value, a new value of the regiser 123 is outputted from a PWM generator 124 and a picture appearing on the screen is gradually enlarged up to size determined by the user. At the time of judging the OFF state of the power supply key, the picture is gradually reduced up to previously determined size.

Inventors:

Shin Jung-Kaeun

Application Number:

JP6074994A

Publication Date:

September 16, 2003

Filing Date:

March 30, 1994

Export Citation:

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