Patent ID: 7123229
Filing Date: 2006-10-17
Classification: G09G

Abstract:
1. A liquid crystal display comprising a plurality of pixel circuits including liquid crystal cell units, arranged to form a matrix on a substrate and vertical driving means for selectively driving the plurality of pixel circuits on a row-by-row basis, wherein each of the plurality of pixel circuits comprises: a memory for holding a digital image signal; a write switch for writing to the memory a digital image signal fed from a signal line wired on a column-by-column basis; a read buffer for reading the digital image signal held in the memory and writing the digital image signal to the liquid crystal cell unit; a pixel select switch for writing an analog image signal fed via the signal line to the liquid crystal cell unit in synchronization with vertical scanning; a read switch that cause a high-impedance state between an output terminal of the read buffer and the liquid crystal cell unit after completion of writing of the digital image signal from the memory to the liquid crystal cell unit by the read buffer; wherein the vertical driving means comprises first and second driving means being disposed on both sides of the pixel region, for driving in a shared manner a plurality of wires connected to the plurality of pixel circuits on a row-by-row basis, including a scanning line for feeding a driving signal to the pixel-select switch, a write-control line for feeding a driving signal to the write switch, a read-control line for feeding a driving signal to the read switch, and a power-supply control line for controlling a power-supply voltage that is fed to the memory circuit, wherein the first driving means is in charge of driving the scanning line and the read-control line, and wherein the second driving means is in charge of driving the write-control line and the power-supply control line.