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Liquid crystal display device

  • US 5,214,418 A
  • Filed: 09/05/1989
  • Issued: 05/25/1993
  • Est. Priority Date: 12/22/1988
  • Status: Expired due to Fees
First Claim
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1. A liquid crystal display device having a color demodulator for demodulating an input color image signal to three primary-color signals, an analog/digital converter for quantizing the color image signal demodulated by said color demodulator to a digital signal and a signal processing circuit for processing the quantized digital signal and supplying it to a driving circuit for image display, said liquid crystal display device comprising a brightness detector for detecting a brightness level of the image signal depending on a most significant bit output only, from said analog/digital converter through quantization, and a voltage dividing circuit for inputting a reference voltage of a level depending on a detected value of said brightness detector to said analog/digital converter for a specified period, and further comprising a capacitor for providing a reference voltage indicating brightness of a predetermined level when the brightness level of the image signal detected by said brightness detector is dark.

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