Projection type video display and method of adjusting the same at factory shipping
AssigneeSanyo Electric Co., Ltd.
InventorsYoshichika Hirao, Naoki Kaise, Kenji Hyakutake
Life of this patent
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Abstract
A microcomputer performs image drawing processing of a projection video for adjustment by an OSD (On-Screen Display) circuit when it detects the press of an adjustment command key. The projection video for adjustment is an image having a black-and-white area high in contrast formed therein. The projection video for adjustment is picked up by a CCD line sensor in a sensor. A microcomputer has its input an image pick-up signal from the CCD line sensor, to make focusing adjustment and trapezoidal distortion correction on the basis of the image pick-up signal.
Claims9
In a projection type video display that optically modulates light emitted from a light source by a light valve and projects a video,
- a projection type video display comprising
- a sensor comprising image pick-up means for picking up a projection video;
- means for making focusing adjustment on the basis of an output of the sensor;
- means for making trapezoidal distortion correction on the basis of the output of the sensor;
- and
- image drawing means for drawing an image used as the projection video by itself, and in that
- a projection video for adjustment utilized for the focusing adjustment and the trapezoidal distortion correction is produced by the image drawing means.
In a projection type video display that optically modulates light emitted from a light source by a light valve and projects an enlarged video by a projection lens,
- a projection type video display comprising:
- a sensor comprising image pick-up means for picking up a projection video;
- means for making focusing adjustment on the basis of an output of the sensor;
- means for successively producing at least a first projection video for adjustment utilized for longitudinal trapezoidal distortion correction and a second projection video for adjustment utilized for lateral trapezoidal distortion correction;
- means for acquiring first information used for longitudinal trapezoidal distortion correction on the basis of the output of the sensor which is projecting the first projection video for adjustment and acquiring second information used for the lateral trapezoidal distortion correction on the basis of the output of the sensor which is projecting the second projection video for adjustment;
- and
- means for making trapezoidal distortion correction on the basis of the first information and the second information.
Dependencies are inferred from the claim text.