Display system with direct color mode
First Claim
1. A display system operable in both indirect and direct color modes, said display system comprising:
- a display memory;
a palette; and
a digital-to-analogue converter stage;
said display system being operable such that;
in an indirect color mode, data in said display memory representing a pixel addresses display data from said palette for conversion in said converter stage into analogue values for controlling a display device; and
in a direct color mode, a first portion of said data representing said pixel in said display memory is directly applied to a first set of inputs of said converter stage, and a second set of inputs of said converter stage being responsive in said direct color mode to data bits from said pallette such that both said first and second set of inputs of said converter stage concurrently control said converter stage and determine the analogue values for the display device.
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Abstract
A display system having a display memory, a palette and a digital-to-analogue converter stage is able to support both an indirect color mode and a direct color mode. In the indirect color mode. pixel data from the display memory is used to access chrominance and/or luminance data from the palette for conversion in the converter stage into analogue values for controlling a display device. In the direct color mode. pixel data in the display memory directly specifies the chrominance and/or luminance data for conversion in the converter stage into analogue values for controlling the display device. In the direct color mode, however, the converter stage is also responsive to data from the palette for producing the analogue values for controlling the display device. The invention permits the provision of direct as well as indirect color modes in a flexible and efficient manner, with the provision of a plurality of formats for the direct color modes being achieved by loading appropriate information into the palette.
19 Citations
11 Claims
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1. A display system operable in both indirect and direct color modes, said display system comprising:
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a display memory; a palette; and a digital-to-analogue converter stage; said display system being operable such that; in an indirect color mode, data in said display memory representing a pixel addresses display data from said palette for conversion in said converter stage into analogue values for controlling a display device; and in a direct color mode, a first portion of said data representing said pixel in said display memory is directly applied to a first set of inputs of said converter stage, and a second set of inputs of said converter stage being responsive in said direct color mode to data bits from said pallette such that both said first and second set of inputs of said converter stage concurrently control said converter stage and determine the analogue values for the display device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification