Patent ID: 6232955
Filing Date: 2001-05-15
Classification: G09G

Abstract:
A palette device controllable by a digital computer with a video memory to produce signals representing color for a color display device, said palette device comprising:a multiple-bit input latch for storing multibit color codes from the video memory, each multibit color code consisting of a first predetermined plurality of minority bits and a second predetermined plurality of majority bits, said second predetermined plurality being greater than said first predetermined plurality;a look-up table memory connected to said multiple-bit input latch for supplying color data words in response to color codes comprising minority bits recalled from said multiple-bit input latch;a digital to analog converter responsive to color data words to produce an analog color signal;a detector circuit connected to said minority bits of said multiple-bit input latch for detecting a predetermined condition on said minority bits stored in said multiple-bit input latch; andselection circuitry having inputs connected to receive majority bits from said multiple-bit input latch and also connected to receive color data was supplied by said look-up table memory, having a control input connected to said detector circuit and an output connected to said digital to analog converter, said selection circuitry supplying said digital to analog converter either with a color data word supplied by said look-up table memory when said detector circuit fails to detect said predetermined condition or with a color data word comprised of the majority bits from the multiple-bit input latch when said detector circuit detects said predetermined condition.