Patent ID: 6363508
Filing Date: 2002-03-26
Classification: G01R,G02F,G09G

Abstract:
A method of testing a reflection-type LCD projector, focusing on testing the digital-circuit portion of the data drivers of the silicon wafer liquid crystal of the projector, comprising the steps of:providing a first test pattern which has 2n bits of digital data (P1ËœP2n); where P2jâˆ’1=0, P2j=1, and 1&lE;j&lE;n; providing a second test pattern which has 2n bits of digital data (Q1ËœQ2n); where Q2jâˆ’1=1, Q2j=0; inputting the first test pattern (P1ËœP2n) to the digital-circuit portion, obtaining 2n bits of the first processed data Pr1ËœPr2n from the digital-circuit portion; wherein every value of P1, P3, ËœP2nâˆ’1 processed by the digital-circuit portion is assigned to each of the respective Pr2jâˆ’1, while every value of P2, P4, ËœP2n processed by the digital-circuit portion is assigned to each of the respective Pr2j; inputting the second test pattern (Q1ËœQ2n) to the digital-circuit portion, obtaining 2n bits of the second processed data Qr1ËœQr2n from the digital-circuit portion; wherein every value of Q1, Q3, ËœQ2nâˆ’1 processed by the digital-circuit portion is assigned to each of the respective Qr2jâˆ’1, while every value of Q2, Q4, ËœQ2n processed by the digital-circuit portion is assigned to each of the respective Qr2j; providing a first testing apparatus for receiving a first specific value and the first processed data Pr1ËœPr2n; and providing a second testing apparatus for receiving a second specific value and the second processed data Qr1ËœQr2n; wherein if the first and second testing apparatuses output the first and second specific values respectively, then the digital-circuit portion has processed the first and second test patterns without any error.