Claims
- 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.
- 2. The display system of claim 1 wherein, in said direct color mode, a second portion of said data representing said pixel is supplied as an input to address said palette for determining data bits output therefrom to said second set of inputs of said converter stage.
- 3. The display system of claim 2 wherein said converter comprises a plurality of digital-to-analogue converters and, in said direct color mode, all bits input to one of said converters is supplied from said palette.
- 4. The display system of claim 3 wherein said converter stage comprises at least three n bit digital-to-analogue converters, one for each primary color of the display device.
- 5. The display system of claim 4 wherein n is six.
- 6. The display system of claim 2 wherein said converter stage comprises three eight bit digital-to-analogue converters, one for each primary color of the display device.
- 7. The display system of claim 2 wherein, in said direct color mode, said display memory contains m bits of display data per pixel.
- 8. The display of claim 7 wherein m is sixteen.
- 9. The display system of claim 2 wherein said display data further comprises chrominance data.
- 10. The display system of claim 2 wherein said display data further comprises luminance data.
- 11. The display system of claim 2 wherein said display data further comprises chrominance and luminance data.
Priority Claims (1)
Number |
Date |
Country |
Kind |
89310456.2 |
Oct 1989 |
EPX |
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Parent Case Info
This is a continuation of U.S. patent application Ser. No. 07/484,142 filed on Feb. 23, 1990, now abandoned.
US Referenced Citations (7)
Continuations (1)
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Number |
Date |
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Parent |
484142 |
Feb 1990 |
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