Image display apparatus and voltage control method
AssigneeSeiko Epson Corporation
InventorTomio IKEGAMI
Life of this patent
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Abstract
An image display apparatus includes a light source, a scanner that scans an output beam emitted from the light source to forms an image on a projection surface, a light source driver that control intensity of the output beam emitted from the light source by controlling a drive current for driving the light source based on input image data, a light source drive power supply that supplies power to the light source driver, and a voltage controller that controls an output voltage from the light source drive power supply based on the input image data.
Claims4
An image display apparatus comprising:
- a light source;
- a scanner that scans an output beam emitted from the light source to forms an image on a projection surface;
- a light source driver that control intensity of the output beam emitted from the light source by controlling a drive current for driving the light source based on input image data;
- a light source drive power supply that supplies power to the light source driver;
- and
- a voltage controller that controls an output voltage from the light source drive power supply based on the input image data.
A voltage control method used in an image display apparatus including a light source, a light source driver that controls intensity of an output beam emitted from the light source based on input image data, a light source drive power supply that supplies power to the light source driver, and a scanner that scans the output beam emitted from the light source, for controlling an output voltage from the light source drive power supply, the method comprising:
- (a) when the input image data are divided into predetermined data units, detecting the maximum intensity among the intensities of the output beam emitted from the light source and corresponding to the image data that belong to each of the predetermined data units;
- (b) calculating a value specifying the output voltage from the light source drive power supply based on the maximum intensity detected in (a);
- and
- (c) controlling the output voltage from the light source drive power supply to have the output voltage specifying value calculated in (b).
Dependencies are inferred from the claim text.