Patent ID: 6870552
Filing Date: 2005-03-22
Classification: G09G

Abstract:
1. An image display apparatus that displays an image based on an input video signal, said image display apparatus comprising: a signal adjustment device that adjusts a tone characteristic of the input video signal and outputs an adjusted video signal; and an electro-optic device that outputs image light representing the image in response to the adjusted video signal supplied from said signal adjustment device, said signal adjustment device comprising a former stage signal adjustment module including first through third former stage color signal adjustment modules, and a latter stage signal adjustment module including first through third latter stage color signal adjustment modules, said first through third former stage color signal adjustment modules respectively adjusting tone characteristics of first through third color video signals, which are constituents of the input video signal, based on first adjustment information regarding an input-output characteristic of said image display apparatus; and said first through third latter stage color signal adjustment modules respectively adjusting tone characteristics of first through third former stage-adjusted color video signals supplied from said first through third former stage color signal adjustment modules, based on second adjustment information regarding the input-output characteristic of said image display apparatus, wherein each of said first through third former stage color signal adjustment modules comprises: a signal conversion sub-module that outputs an upper q-bit color video signal, where q is an integer of not less than 1 and not greater than (p−1), in response to input of a corresponding p-bit color video signal, where p is an integer of not less than 2; a first lookup table that stores information representing a mapping of a tone value expressed by the upper q-bit color video signal to an r-bit tone value set according to the first adjustment information, where r is an integer of not less than p, said first lookup table outputting, in response to input of the upper q-bit color video signal from said signal conversion sub-module, an r-bit first reference signal, which represents a lower tone value than a tone value corresponding to the p-bit color video signal, and an r-bit second reference signal, which represents a higher tone value than the tone value corresponding to the p-bit color video signal; and an interpolation sub-module that interpolates and generates an r-bit former stage-adjusted color video signal corresponding to the p-bit color video signal, based on the first reference signal and the second reference signal, each of said first through third latter stage color signal adjustment modules comprising: a second lookup table that stores information representing a mapping of an r-bit tone value expressed by the former stage-adjusted color video signal supplied from its corresponding former stage color signal adjustment module to an r-bit tone value set according to the second adjustment information.