A projector and its temperature compensation method for trapezoidal correction

Abstract

The invention relates to the field of projectors, and in particular to a temperature compensation method of trapezoidal correction of a projector. The method comprises the following steps: triggeringthe trapezoidal correction of the projector; obtaining the temperature of a projection lens; compensating a preset parameter of a projection unit according to the temperature of the projection lens; obtaining a trapezoidal correction parameter according to the compensated preset parameter and calibration information of a projection image, completing automatic trapezoidal correction according to the trapezoidal correction parameter, and projecting a corrected rectangular image on a projection display surface. The invention further relates to a projector. According to the temperature compensation method of the trapezoidal correction of the projector designed in the invention, the temperature of the projection lens is obtained to compensate the preset parameter of the projection unit during the trapezoidal correction so as to eliminate a projection error, obtain a real-time trapezoidal correction parameter, completes the trapezoidal correction of the projected image and improve the precision of the trapezoidal correction.

Description

technical field [0001] The invention relates to the field of projectors, in particular to a projector and a temperature compensation method for trapezoidal correction thereof. Background technique [0002] Due to the thermal effect of the projection optics lens material, when the temperature changes, the refractive index and expansion coefficient of the lens will change, thereby causing the projection parameters to change. The projection distance remains the same, when the temperature rises, the projection screen of the projection unit will become smaller; when the temperature drops, the projection screen of the projection unit will become larger. [0003] In particular, in the process of trapezoidal correction based on the principle of triangulation, changes in the projected image cause changes in the position of the calibration point, which amplifies the calculation error of the deflection angle and greatly affects the effect of the trapezoidal correction. Therefore, chan...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a projector and a temperature compensation method for trapezoidal correction to solve the problem of inaccurate trapezoidal correction caused by changes in the projection screen due to changes in lens temperature.

[0006] The technical problem to be solved by the present invention is to provide a projector to solve the problem of inaccurate trapezoidal correction due to the change of the projected picture due to the change of the lens temperature.

Images