Claims
- 1. A method of driving a liquid crystal device, comprised of a ferroelectric liquid crystal disposed between a pair of substrates, said liquid crystal comprising grains having a diameter of less than 400 nm added to the liquid crystal and finely distributed domains having a range of threshold voltages, said liquid crystal having reversed domains which yield a transmittance of 25% when 300 or more of said domains 2 μm or more in diameter are distributed in a viewing area of 1 mm2, a single domain having a threshold voltage which ranges over 2 volts in correspondence with a change in transmittance of from 10 to 90%, said method comprising the steps of:applying a modulated data signal to a data electrode in synchronization with application of an addressing signal to a scanning electrode, said data signal having its pulse voltage or pulse width or both of the pulse voltage and pulse width modulated in correspondence with a gray scale of pixels of the device, and utilizing a color filter in combination with said pixels of the device.
- 2. The method of claim 1 further comprising the steps of:dividing the data electrodes constituting a single pixel into a plurality of portions each differing in area from another, and the application of a combination of data signals corresponding to the gray scale of the pixel to said divided plurality of data electrode portion in synchronization with the application of an addressing signal to a scanning electrode.
- 3. The method of claim 1, wherein, a plurality of line addressing is repeated per single pixel within a single frame or single field in correspondence with the gray scale of the pixel.
- 4. The method of claim 3, wherein, a maximum integer n, which satisfies a relation that either the number of linear gray-scale levels per single pixel is not less than [(m+1)n−1+1] or the number of non-linear gray-scale levels per single pixel is not less than n+1, is combined with the repetition times m of line addressing per single pixel in a single frame or single field, so that the transmittance per pixel may be controlled to yield a ratio of 1:(m+1)1:(m+1)2: . . . :(m+1)n−2:(m+1)n−1.
- 5. The method of claim 1 further comprising the steps of:dividing the data electrodes constituting a single pixel into a plurality of portions each differing in area from another, and applying a combination of data signals corresponding to the gray scale of the pixel to said divided plurality of data electrode portion in synchronization with the application of an addressing signal to a scanning electrode; and wherein, a plurality of line addressing is repeated per single pixel within a single frame or single field in correspondence with the gray scale of the pixel.
- 6. The method of claim 5, wherein, said data electrode is divided into portions at an area ratio of 1:(m+1):(m+1)2: . . . :(m+1)n−2:(m+1)n−1, where n represents the number of pixel portions obtained by dividing a single pixel, and m represents the repetition times of line addressing per single pixel within a single frame or single field.
- 7. The method of claim 5, wherein, the number of gray-scale levels l per single pixel which results from the modulated data signal and the number of division n of a data electrode constituting single pixel are combined so that the data electrode is divided into portions at an area ratio of 1:l1:l2: . . . :ln−2:ln−1.
- 8. The method of claim 5, wherein, a maximum integer number n, which satisfies a relation obtained by combining the modulated data signal and the number of division of the data electrode constituting single pixel so that either the number of linear gray-scale levels per single pixel is not less than [(m+1)n−1+1] or the number of non-linear gray-scale levels per single pixel is not less than n+1, is combined with the repetition times m of line addressing per single pixel in a single frame or single field, thereby controlling the transmittance per pixel to yield a ratio of 1:(m+1)1:(m+1)2: . . . :(m+1)n−2:(m+1)n−1.
- 9. The method of claim 1 further comprising the steps of:switching each of the backlights corresponding to the respective colors at least once in a single frame or single field.
- 10. A method of driving a liquid crystal device, comprised of a ferroelectric liquid crystal disposed between a pair of substrates, said liquid crystal comprising grains having a diameter of less than 400 nm added to the liquid crystal and finely distributed domains having a range of threshold voltages, said liquid crystal having reversed domains which yield a transmittance of 25% when 300 or more of said domains 2 μm or more in diameter are distributed in a viewing area of 1 mm2, a single domain having a threshold voltage which ranges over 2 volts in correspondence with a change in transmittance of from 10 to 90%, said method comprising the steps of:applying a modulated data signal to a data electrode in synchronization with the application of an addressing signal to a scanning electrode, said data signal having its pulse voltage or pulse width or both of the pulse voltage and pulse width modulated in correspondence with a gray scale of pixels of the device; and switching each of backlights corresponding to a respective color of each pixel at least once in a single frame or single field.
- 11. The method of claim 10, further comprising the steps of:dividing the data electrodes constituting a single pixel into a plurality of portions each differing in area from another, and applying a combination of data signals corresponding to the gray scale of the pixel to said divided plurality of data electrode portion in synchronization with the application of an addressing signal to a scanning electrode.
- 12. The method of claim 10, wherein a plurality of line addressing is repeated per single pixel within a single frame or single field in correspondence with the gray scale of the pixel.
- 13. The method of claim 12, wherein, a maximum integer n, which satisfies a relation that either the number of linear gray-scale levels per single pixel is not less than [(m+1)n−1+1] or the number of non-linear gray-scale levels per single pixel is not less than n+1, is combined with the repetition times m of line addressing per single pixel in a single frame or single field, so that the transmittance per pixel may be controlled to yield a ratio of 1:(m+1)1:(m+1)2: . . . (m+1)n−2:(m+1)n−1.
- 14. The method of claim 10 further comprising the steps of:dividing the data electrodes constituting a single pixel into a plurality of portions each differing in area from another, and applying a combination of data signals corresponding to the gray scale of the pixel to said divided plurality of data electrode portion in synchronization with the application of an addressing signal to a scanning electrode; and, wherein, a plurality of line addressing is repeated per single pixel within a single frame or single field in correspondence with the gray scale of the pixel.
- 15. A method of driving a liquid crystal device as claimed in claim 14, wherein,said data electrode is divided into portions at an area ratio of 1:(m+1):(m+1)2: . . . :(m+1)n−2:(m+1)n−1, where n represents the number of pixel portions obtained by dividing a single pixel, and m represents the repetition times of line addressing per single pixel within a single frame or single field.
- 16. The method of claim 14, wherein, the number of gray-scale levels l per single pixel which results from the modulated data signal and the number of division n of a data electrode constituting single pixel are combined so that the data electrode is divided into portions at an area ratio of 1:l1:l2: . . . :ln−2:ln−1.
- 17. The method of claim 14, wherein, a maximum integer number n, which satisfies a relation obtained by combining the modulated data signal and the number of division of the data electrode constituting single pixel so that either the number of linear gray-scale levels per single pixel is not less than [(m+1)n−1+1] or the number of non-linear gray-scale levels per single pixel is not less than n+1, is combined with the repetition times m of line addressing per single pixel in a single frame or single field, thereby controlling the transmittance per pixel to yield a ratio of 1:(m+1)1:(m+1)2: . . . :(m+1)n−2:(m+1)n−1.
Priority Claims (1)
Number |
Date |
Country |
Kind |
5-325850 |
Nov 1993 |
JP |
|
RELATED APPLICATION DATA
This application is a divisional of U.S. application Ser. No. 08/347,245 filed Nov. 23, 1994 now U.S. Pat. No.6,016,133, The present and foregoing applications claim priority to Japanese application No. P05-325850 filed Nov. 30, 1993. The foregoing applications are incorporated herein by reference to the extent permitted by law.
US Referenced Citations (28)