System for applying grey scale codes to the pixels of a display device

Claim 1

A system for applying a plurality of digital grey scale codes to the pixels of a display device composed of an array of pixels arranged vertically in Y columns and horizontally in rows comprising: shift register means for receiving and storing said grey scale codes for said columns, said shift register means having a plurality of groups, each of said groups having a plurality of segments whereby said shift register means includes Y shift register segments and each segment stores said grey scale codes for a particular column and provides said grey scale codes to said particular column; a plurality of Y multiplex means individually responsive to said shift register segments for receiving said grey scale codes; a plurality of counters individually responsive to said multiplex means for receiving said grey scale codes from said shift register segments to set said counters to counts equal to said grey scale codes whereby said counters count down from said counts to zero; and a plurality of transfer circuit means, each of said transfer circuit means including a latch circuit responsive to one of said counters and a transfer gate responsive to said latch circuit, said transfer gates being conductive when said counters are counting and nonconductive after said counters have counted to zero whereby said transfer gates are conductive in accordance with the grey scale codes received from said shift register segments.

Claim 2

A system for applying a plurality of digital grey scale codes to the pixels of a display device composed of an array of pixels arranged vertically in Y columns and horizontally in rows comprising: shift register means for receiving and storing said grey scale codes for said columns, said shift register means having a plurality of groups, each of said groups having a plurality of segments whereby said shift register means includes Y shift register segments and each segment stores said grey scale codes for a particular column and provides said grey scale codes to said particular column; a plurality of Y multiplex means individually responsive to said shift register segments for receiving said grey scale codes; a plurality of counters individually responsive to said multiplex means for receiving said grey scale codes from said shift register segments to set said counters to counts equal to said grey scale codes whereby said counters count down from said counts to zero; and a plurality of transfer circuit means, each of said transfer circuit means including a latch circuit responsive to one of said counters and a transfer gate responsive to said latch circuit, said transfer gates being conductive when said counters are counting and nonconductive after said counters have counted to zero whereby said transfer gates are conductive in accordance with the grey scale codes received from said shift register segments.