Patent ID: 7753534

Claim:
A projection device comprising: a light source; an input/output connector section for inputting/outputting image signals of different standards; a projection driving section for forming a light image based on image signals input by the input/output connector section to project the light image using light from the light source; a detection section for detecting a luminance distribution of an image projected by the projection driving section; and a control section for: (i) obtaining an error pattern of the luminance distribution by comparing a luminance distribution of the image signals input by the input/output connector section with the luminance distribution of the projected image detected by the detection section, (ii) detecting a state of direction as well as a state of degree of trapezoidal distortion on a projection target surface based on the obtained error pattern of the luminance distribution, and (iii) correcting the luminance distribution of the light image formed by the projection driving section in accordance with the luminance distribution obtained by the detection section, wherein the control section reflects the detected trapezoidal distortion states on a shape of the light image formed by the projection driving section and on the correction of the luminance distribution.