Drive circuit for liquid crystal display cell

A drive circuit for use with a liquid crystal display, said driver circuit being coupled to said liquid crystal display at a region defining a picture element, said picture element having a pixel capacitance, said drive circuit comprising:

• a first select switching means responsive to a first select signal, said first select switching means having a first input node and a first output node, said first switching means being effective for selectively coupling said first input node to said first output node in response to said first select signal;
• a second select switching means responsive to a second select signal, said second select switching means having a second input node and a second output node, said second switching means being effective for selectively coupling said second input node to said second output node in response to said second select signal;
• a first enable switching means, said first enable switching means having a third input node and third output node and being responsive to a digital enable input signal selectively alternating between a first logic state and a second logic state, said first enable switching means being effective for coupling said third input node to said third output node in response to said enable signal being at said first logic state;
• a second enable switching means, said second enable switching means having a fourth input node and fourth output node and being responsive to said enable input signal, said second enable switching means being effective for coupling said fourth input node to said fourth output node in response to said enable signal being at said second logic state;
• a first voltage storage means and a second voltage storage means;
• said first input node being coupled to said second input node for receiving a video signal;
• said first output node being coupled to said third input node, said first voltage storage means being coupled between said first output node and a reference voltage node;
• said second output node being coupled to said fourth input node, said second voltage storage means being coupled between said second output node and said reference voltage node;
• said third output node and said fourth output node being coupled to said region.

A liquid crystal display comprising:

• an array of rows and columns of pixel drive circuits, said drive circuits being effective for coupling a first video signal to a first storage means in response to first select signal and coupling a second video signal to a second storage means in response to a second select signal, each of said drive circuits further having an output node coupled to predetermined regions of said liquid crystal display, each of said regions defining a picture element;
• a first row select circuit for generating said first select signals;
• a second row select circuit for generating said second select signals;
• an enable control input for selectively coupling one or said first and second storage means from at least one of said drive circuits to its respective output node.