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Multiple channel programmable gamma correction voltage generator

  • US 7,446,747 B2
  • Filed: 01/28/2004
  • Issued: 11/04/2008
  • Est. Priority Date: 09/12/2003
  • Status: Expired due to Fees
First Claim
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1. A multiple channel programmable gamma correction voltage generator, comprising:

  • a reference voltage applied across a resistor ladder;

    said resistor ladder including M adjustable tap resistors distributed along said resistor ladder, each providing a corresponding one of M tap voltages distributed according to a gamma correction value, wherein M is a positive integer;

    said resistor ladder comprising a plurality of first resistors coupled in series, each of said plurality of first resistors comprising a plurality of second resistors coupled in series forming a plurality of intermediate locations;

    M buffers, each having an input receiving a corresponding one of said M tap voltages and an output providing a corresponding one of M gamma correction voltages;

    select logic which inserts each of said M adjustable tap resistors into said resistor ladder into M of said plurality of first resistors by inserting a corresponding one of said M adjust adjustable tap resistors at a selected one of said plurality of intermediate locations of a corresponding one of said plurality of first resistors, and that selects a tap point of each of said M adjustable tap resistors to select each of said M tap voltages based on corresponding select values; and

    a programmable non-volatile memory device, coupled to said select logic, that provides said select values indicative of said gamma correction value.

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