Patent ID: 7388181
Filing Date: 2008-06-17
Classification: G02B,G02F,G03B

Abstract:
1. An apparatus for adjusting applied voltage in a display system, the apparatus including an optical source system, an illumination optical unit, a diffractive optical modulator, a projection and scanning optical unit and a screen, the diffractive optical modulator having a first reflective part and a second reflective part spaced apart from the first reflective part by a specific distance, generating diffracted light using light reflected from the first and second reflective parts, and varying the specific distance between the first and second reflective parts using a piezoelectric layer made of piezoelectric material, the apparatus comprising: a light intensity detection unit for measuring an intensity of diffracted light output when the applied voltage is applied to the piezoelectric layer of the diffractive optical modulator, and outputting the measured intensity of the diffracted light; and an applied voltage adjustment unit for applying the applied voltage to the piezoelectric layer of the diffractive optical modulator, receiving the intensity of the diffracted light, which is output from the diffractive optical modulator, from the light intensity detection unit, comparing the received intensity of diffracted light with an expected intensity of light, which is expected to be measured when the applied voltage is applied to the piezoelectric layer of the diffractive optical modulator, and adjusting the applied voltage that must be used in order to obtain a specific light intensity from the diffractive optical modulator.