Claims
- 1. A multiple-tone display system for providing multiple-tone representations for display on a display device having a plurality of pixels arrayed in a dot matrix pattern, said display system comprising:
- a data converter for receiving multiple-tone display information containing n bits per pixel, and sequentially converting the n-bit multiple-tone display information into m-bit display data corresponding to one horizontal line on the display device;
- a drive voltage generator having a group of voltage dividing resistors for dividing a reference voltage non-uniformly into M drive voltage levels to provide unequal differences between adjacent ones of the drive voltage levels such that display intensities of a plurality of display tones based on such drive voltage levels are defined as a convex function of a grade of said plurality of tones when said display intensities are plotted on a logarithmic scale with respect to said plurality of tones;
- a data driver for selecting one of the M drive voltage levels from said drive voltage generator for display data of each pixel on one horizontal line on the display device, and connecting said drive voltage generator with said data converter so as to supply the selected drive voltage level to the display device in accordance with the display data supplied by said data converter, said data driver selecting two different drive voltage levels in successive frames with respect to at least some of a plurality of display tones such that display intensities of the plurality of display tones are defined as a convex function of a grade of said plurality of tones when said plurality of display intensities are plotted on a logarithmic scale with respect to said plurality of tones, in order to obtain N grades of display tones by said M-level drive voltage generator, wherein m and n are natural numbers larger than 1, M=2.sup.m, N=2.sup.n, and M<N; and
- a scan driver for selecting one horizontal line on the display device for successive display of multiple-tone representations in synchronism with the operation of said data converter and said data driver.
- 2. A multiple-tone display system according to claim 1, further comprising a display device including for each pixel a switching element and a liquid crystal controlled by the switching element.
- 3. A multiple-tone display system according to claim 1, further comprising a display device for providing a multiple tone display.
- 4. A multiple-tone display system according to claim 1, further comprising a display device including a plurality of display dots, each of the display dots comprising three pixels of R, G and B, so as to display in M.sup.3 colors in accordance with the M-level drive voltage generated by said drive voltage generator.
- 5. A multiple-tone display system according to claim 1, wherein said data converter includes data conversion units of R, G and B, each conversion unit being constituted separately.
- 6. A multiple-tone display system for providing multiple-tone representations for display on a display device having a plurality of pixels arrayed in a dot matrix pattern, said display system comprising:
- a data converter for receiving multiple-tone display information containing four bits per pixel, and sequentially converting the four-bit multiple-tone display information into three-bit display data corresponding to one horizontal line on the display device;
- a drive voltage generator having a group of voltage dividing resistors for dividing a reference voltage non-uniformly into eight drive voltage levels to provide unequal differences between adjacent ones of the drive voltage levels such that display intensities of a plurality of display tones based on such drive voltage levels are defined as a convex function of a grade of said plurality of tones when said display intensities are plotted on a logarithmic scale with respect to said plurality of tones;
- a data driver for selecting one of the eight drive voltage levels from said drive voltage generator for display data of each pixel on one horizontal line on the display device, and connecting said drive voltage generator with said data converter so as to supply the selected drive voltage level to the display device in accordance with the display data supplied by said data converter, said data driver selecting two different drive voltage levels in successive frames with respect to at least some of a plurality of display tones such that display intensities of the plurality of display tones are defined as a convex function of a grade of said plurality of tones when said plurality of display intensities are plotted on a logarithmic scale with respect to said plurality of tones, in order to obtain 16 grades of display tones by said eight-level drive voltage generator; and
- a scan driver for selecting one horizontal line on the display device for successive display of multiple-tone representations in synchronism with the operation of said data converter and said data driver.
- 7. A multiple-tone display system according to claim 6, further comprising a display device including for each pixel a switching element and a liquid crystal controlled by the switching element.
- 8. A multiple-tone display system according to claim 6, further comprising a display device for providing a multiple-tone display.
- 9. A multiple-tone display system according to claim 6, further comprising a display device including a plurality of display dots, each of the display dots comprising three pixels of R, G and B, so as to display in 512 colors in accordance with the eight level drive voltage generated by said drive voltage generator.
- 10. A multiple-tone display system according to claim 6, wherein said data converter includes data conversion units of R, G and B, each conversion unit being constituted separately.
- 11. A multiple-tone display system for providing multiple-tone representations for display on a display device having a plurality of pixels arrayed in a dot matrix pattern, said display system comprising:
- a data converter for receiving multiple-tone display information containing n bits per pixel, and sequentially converting the n-bit multiple-tone display information into m-bit display data corresponding to one horizontal line on the display device;
- a drive voltage generator having a group of voltage dividing resistors for dividing a reference voltage non-uniformly into M drive voltage levels to provide unequal differences between adjacent ones of the drive voltage levels such that display intensities of a plurality of display tones based on such drive voltage levels are defined as a convex function of a grade of said plurality of tones when said display intensities are plotted on a logarithmic scale with respect to said plurality of tones;
- a data driver for selecting one of the M drive voltage levels from said drive voltage generator for display data of each pixel on one horizontal line on the display device, and connecting said drive voltage generator with said data converter so as to supply the selected drive voltage level to the display device in accordance with the display data supplied by said data converter, said data driver selecting two different drive voltage levels in successive frames with respect to at least some of a plurality of display tones such that display intensities of the plurality of display tones are defined as a convex function of a grade of said plurality of tones when said plurality of display intensities are plotted on a logarithmic scale with respect to said plurality of tones, in order to obtain N grades of display tones by said M-level drive voltage generator; and
- a scan driver for selecting one horizontal line on the display device for successive display of multiple-tone representations in synchronism with the operation of said data converter and said data driver, wherein m>3, m>4, M>8, N>16, M<N.ltoreq.2.sup.n, and M=2.sup.m.
- 12. A multiple-tone display system according to claim 11, further comprising a display device including for each pixel a switching element and a liquid crystal controlled by said switching element.
- 13. A multiple-tone display system according to claim 11, further comprising a display device for providing a multiple-tone display.
- 14. A multiple-tone display system according to claim 11, further comprising a display device including a plurality of display dots, each of the display dots comprising three pixels of R, G and B, so as to display in M.sup.3 colors in accordance with the M-level drive voltage generated by said drive voltage generator.
- 15. A multiple-tone display system according to claim 11, wherein said data converter includes data conversion units of R, G and B, each conversion unit being constituted separately.
Priority Claims (1)
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4-039203 |
Feb 1992 |
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Parent Case Info
This application is a Continuation of application Ser. No. 08/486,291, filed Jun. 7, 1995 now U.S. Pat. No. 5,610,636, which is a Divisional Application of Ser. No. 08/018,494 filed Feb. 17, 1993, now U.S. Pat. No. 5,495,287.
US Referenced Citations (8)
Divisions (1)
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18494 |
Feb 1993 |
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Continuations (1)
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486291 |
Jun 1995 |
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