| 摘要 |
PURPOSE: A liquid crystal display device is provided to easily adjust the voltage variation of input image signal. CONSTITUTION: A liquid crystal display device includes an amplifier, an A/D converter(18), a signal processor circuit, and a liquid crystal display panel(21). The amplifier amplifies analog image signal. The signal processor circuit includes an on screen mixer circuit(19) mixing the output of the A/D converter and an on screen display signal. The liquid crystal display panel(21) is operated according to the digital output of the signal processor circuit. The signal processor circuit generates the digital output representing the region corresponding to the maximum value of the analog image and a test pattern of the maximum level. The amplifier is operated according to the input of an operator so as to change the gain of the amplifier. The output of the amplifier is regarded as the input voltage of the maximum level of the A/D converter. |
