Cholesteric liquid crystal display device and method for controlling drive of cholesteric liquid crystal display element
A cholesteric liquid crystal, display element technology, applied in static indicators, instruments, nonlinear optics, etc., can solve problems such as no consideration of differences or long-term changes
Inactive Publication Date: 2013-10-23
FUJITSU LTD
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However, this proposal only takes into account adjustments based on temperature and does not take into account differences or long-term changes in
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[0041] Hereinafter, embodiments will be specifically described with reference to the drawings.
[0042] figure 1 is a diagram showing an outline of the configuration of the display device of the embodiment. The display device of this embodiment is electronic paper. The drive signal is applied to the display element 10 only when the display is rewritten, and the rewritten display is maintained even if the drive signal is not applied.
[0043] like figure 1As shown, the display device of the embodiment has a display element 10 using a cholesteric liquid crystal, a segment driver 11, a common driver 12, a power supply unit 13, a current sense amplifier 14, a host control unit 21, a frame memory 22, and a control unit 23 .
[0044] The host control unit has a main CPU and the like, and executes various processes on image data stored in an external storage device and image data obtained via a communication circuit to form an image suitable for display on the display device. Fo...
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Abstract
A cholesteric liquid crystal display device includes a passive matrix cholesteric liquid crystal display element, a drive circuit configured to apply a voltage pulse by a dynamic driving scheme to the cholesteric liquid crystal display element, an electrostatic capacitance detection circuit configured to detect the electrostatic capacitance of the display element; and a drive condition adjustment circuit configured to set a display state by driving the display element under a predetermined drive condition and then to adjust the drive condition of the display element based on the electrostatic capacitance of the display element detected by the electrostatic capacitance detection circuit, wherein the drive condition adjustment circuit searches for and determines an optimum evolution voltage with a temporarily-determined number of pulses during an evolution period and then searches for and determines an optimum value of the number of pulses during the evolution period with the determined evolution voltage.
Description
technical field [0001] The disclosed technology relates to a cholesteric liquid crystal display device and a method for controlling driving of a cholesteric liquid crystal display element. Background technique [0002] As a display element, a display element using a cholesteric liquid crystal having memory properties has been developed and applied to electronic paper and the like. A display element using a cholesteric liquid crystal can obtain a planar state reflecting light having a specific wavelength, a focal conic state through which light passes, and an intermediate state between the planar state and the focal conic state by adjusting the strength of an electric field to be applied, And an image is displayed by setting the liquid crystal of each pixel to any one of these states. [0003] As methods for driving liquid crystal display elements, passive matrix and active matrix are known. Generally, display elements using cholesteric liquid crystals have a passive matrix...
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IPC IPC(8): G02F1/1362G02F1/133G02F1/137G09G3/36
CPCG02F1/13306G09G3/3629G09G3/3696G09G2310/067G09G2380/14
Inventor 植原启方
Owner FUJITSU LTD