Liquid crystal driver device and liquid crystal driver unit
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsShiro Dosho, Keijiro Umehara, Yuusuke Tokunaga
Life of this patent
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Abstract
A digital signal corresponding to each pixel of a liquid crystal display (LCD) is converted into an analog signal by a digital-to-analog (D-A) converting section. A CCD (Charge Coupled Device) delay line sequentially transfers the received analog signal according to a transfer clock signal. In response to a drive control signal, a signal output section receives the analog signal from the CCD delay line for output as a pixel signal of the LCD. The above structure eliminates the need to provide a multiplicity of D-A converters corresponding to the number of pixels per scanning line.
Claims8
A liquid crystal driver device for driving a liquid crystal display (LCD) according to a digital signal corresponding to each pixel of the LCD, comprising:
- a digital-to-analog (D-A) converting section for converting the digital signal into an analog signal;
- a drive control section for outputting a transfer clock signal and a drive control signal;
- a signal transfer section having a transfer means including series-connected delay stages, for sequentially transferring the analog signal output from the D-A converting section across the transfer means according to the transfer clock signal;
- and
- a signal output section for receiving the analog signal from each delay stage of the transfer means and outputting the received analog signal as a pixel signal of the LCD in response to the drive control signal.
A unit forming a liquid crystal driver device for driving a liquid crystal display (LCD), comprising:
- a signal end for receiving an analog signal;
- a drive control section for outputting a transfer clock signal and a drive control signal;
- a signal transfer section having a transfer means including series-connected delay stages, for sequentially transferring the analog signal applied to the signal end across the transfer means according to the transfer clock signal;
- and
- a signal output section for receiving the analog signal from each delay stage of the transfer means and outputting the received analog signal as a pixel signal of the LCD in response to the drive control signal.
Dependencies are inferred from the claim text.