| Patent Number |
Title Of Patent |
Date Issued |
| 5805131 |
Ferroelectric display device with temperature compensation |
September 8, 1998 |
| To compensate for the variation of the transmission-voltage characteristic curve due to temperature changes in a ferro-electric display device, the display device is provided with one or more measuring elements (5) for measuring the polarization current. The drive voltages are corrected |
| 5404236 |
Display device with crossing electrodes with specific ratio for gray scale |
April 4, 1995 |
| An electro-optic display device with grey scale set by areas of crossing electrodes. In one embodiment, there are 3 strip-shaped sub electrodes with a width relationship of 4:2:1, and two strip shaped column electrodes with a relationship of 8:1. In a second embodiment, there are 4 s |
| 5208689 |
Electro-optic display device with increased number of transmission levels |
May 4, 1993 |
| An LCD device in which the pixels are divided into sub-pixels composed of one analog adjustable sub-pixel and a plurality of digitally controlled other sub-pixels. By combining a discrete adjustment of the (sub)-transmission levels of the other sub-pixels with an analog adjustment of |
| 5151804 |
Ferroelectric liquid crystal display having a spread of angles for grayscale and method of manuf |
September 29, 1992 |
| A liquid crystal device incorporating ferroelectric liquid crystal medium having smectic layers between two supporting plates provided with electrodes, the smectic layers exhibiting a spread of angles with respect to at least one of the supporting plates, whereby a gradual transmissi |
| 5047758 |
Method of driving a passive ferro-electric liquid crystal display device |
September 10, 1991 |
| In a method of driving a passive ferro-electric display device the selection voltages, "blanking" voltages and data voltages are given a bipolar character so that the values of the data voltages with respect to the "blanking" voltage can be chosen to be so low that there is substanti |
| 4976515 |
Method of driving a ferroelectric to display device to achieve gray scales |
December 11, 1990 |
| In the case of active drive of a ferro-electric liquid crystal display device the picture elements within the line selection period are first brought to an extreme state by means of a "blanking" signal. To obtain grey scales in a reproducible manner (via charge compensation) the data |
| 4840462 |
Method of driving a ferroelectric liquid crystal display device and associated display device to |
June 20, 1989 |
| By using an auxiliary signal bringing a ferroelectric liquid crystal to an extreme transmission state in an active matrix it is impossible for successive charge compensation to occur on the pixels. This prevents the growth of regions where transmission occurs or does not occur and provid |
