Generation of control signals in an active matrix display

摘要

A data line driver circuit for an active matrix liquid crystal display comprises a shift register (41) composed of a chain of DFF's (42), and a bank (43) of data line drivers (44). Furthermore the circuit (40) incorporates a bank (45) of combinational or sequential logic blocks (46) each of which is locally associated with a respective one of the DFF's (42) and may contain pattern detection logic. Each local logic block (46) receives signals from the outputs of one or more of the local DFF's (42) and generates one or more local control signals for the associated data line driver (44). The pattern detection logic may also generate one or more global control signals. The circuit (40) therefore operates as a distributed controller which generates control signals locally, rather than such signals being generated by a global counter and/or combinational logic circuits.