Image signal processing circuit, image display apparatus and electronic apparatus using the same, and method of adjusting output of digital-analog converter

申请公布号：: US6452526(B2)
申请号：: US19990242905
申请日期：: 1999.02.25
申请公布日期：: 2002.09.17
申请人：: SEIKO EPSON CORPORATION
发明人：: SAGAWA TAKAHIRO;KABURAGI CHIHARU;KURUMISAWA TAKASHI
分类号：: G09G3/36;H04N5/66;(IPC1-7):H03M1/66;H03M11/00
主分类号：: G09G3/36
摘要：: An image signal processing circuit (102) includes a phase-expansion circuit (103), a digital polarity-inversion circuit (104), first to sixth D/A converters (111 to 116), and first to sixth operational amplifiers (151 to 156). The resistance value of the first to sixth amplitude adjusting resistors (121 to 126) which cause the output amplitude of an analog signal output from the first to sixth D/A converters (111 to 116) to be fixed is adjusted by laser trimming. First to sixth gain setting resistors (161 to 166) are connected to the first to sixth operational amplifiers (151 to 156). The first gain setting resistor (161) includes a first resistor (131) and a second resistor (141), and the gain of the operational amplifier (151) is set by the resistance ratio (R2/R1) thereof. In order that this resistance ratio (R2/R1) is fixed for each set, the first resistor (131) and the second resistor (141) are formed on the same substrate by undergoing the same manufacturing process. As a result, there is no need to use the first and second resistors (131, 141) for variable resistors.