Fast response electro-optic display device
DCFirst Claim
1. A display device comprising an electro-optical medium between two supporting plates, provided with a system of pixels arranged in rows and columns, means for providing row and column connections, during operation, with voltages such that column connections are provided with column voltages during at least a part of a selection period in which rows are selected via drive elements, characterized in that the device is provided with correction means which define the column voltages, dependent on externally applied signals provided during the selection period and externally applied signals during a previous selection period of the same column whereby the correction means correct for a variation of pixel capacitance with voltage in the transmission/voltage characteristic.
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Abstract
The response rate of a liquid crystal display device is increased in that capacitive variations in the liquid crystal mixture caused by a different drive voltage or varying capacitances in drive transistors are taken into account in advance. If necessary, the required corrections are performed with a microprocessor, but they are preferably stored in advance in a look-up table.
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Citations
18 Claims
- 1. A display device comprising an electro-optical medium between two supporting plates, provided with a system of pixels arranged in rows and columns, means for providing row and column connections, during operation, with voltages such that column connections are provided with column voltages during at least a part of a selection period in which rows are selected via drive elements, characterized in that the device is provided with correction means which define the column voltages, dependent on externally applied signals provided during the selection period and externally applied signals during a previous selection period of the same column whereby the correction means correct for a variation of pixel capacitance with voltage in the transmission/voltage characteristic.
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3. A display device comprising, at least one pixel with an electro-optical medium between electrodes defining the pixel, a drive unit for applying drive voltages to the electrodes, and correction means correcting the drive voltages at the electrodes dependent on two successive externally applied signals and on the voltage-dependent behaviour of the pixel.
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6. A method of displaying data on a display devise comprising a system of electro-optic pixels having a voltage dependent capacitance, said method comprising:
- applying data signals to the display device, and applying drive voltages to the pixels which are dependent on the applied data signals such that the drive voltages at least partly compensate for a deviation of the transmission level of a pixel due to the voltage-dependent capacitance of the pixel.
- View Dependent Claims (7, 8, 9)
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11. A method of displaying data on a display device of the type comprising a system of pixels with an electro-optical medium between electrodes defining the pixels and a drive unit for applying drive voltages to the electrodes, said method comprising:
- determining the capacitance/voltage characteristic of a pixel, determining correction voltages dependent on respective input signals, and adjusting the drive unit such that it supplies a correction voltage as a response to an input signal, which correction voltage entirely or partly defines the drive voltage at the pixel electrodes.
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12. A display device comprising:
- an electro-optical display medium between two support plates provided with a matrix of row and column electrodes, a system of pixels arranged in rows and columns and which include first and second picture electrodes sandwiching the electro-optical display medium, means for applying selection voltages and data signal voltages to the row and column electrodes, respectively, for the purpose of picture display, wherein said selection voltages are applied to the row electrodes in a row-by-row sequence, and correction means responsive to externally applied signal voltages to produce correction voltages for modifying the data signal voltages to be applied to each column electrode during respective row selection periods, and wherein said correction voltages are determined by the voltage level of the externally applied signal voltages.
- View Dependent Claims (13, 14, 15, 16, 17, 18)
Specification