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Temp. compensation of ferroelectric liquid crystal displays

A ferroelectric liquid crystal and temperature compensation technology, applied in the field of temperature compensation, can solve problems such as device parameter changes and limited device temperature range

Inactive Publication Date: 2004-05-12
QINETIQ LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] A problem with existing displays is that the parameters of the device vary with temperature, which limits the temperature range over which the device can be used

Method used

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  • Temp. compensation of ferroelectric liquid crystal displays
  • Temp. compensation of ferroelectric liquid crystal displays
  • Temp. compensation of ferroelectric liquid crystal displays

Examples

Experimental program
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Embodiment Construction

[0058] figure 1 , The display 1 shown in 2 includes two glass walls 2, 3 separated by a spacer ring 4 and / or distribution spacers 1-6um. Electrode structures 5 , 6 made of transparent tin oxide or indium tin oxide (ITO) are formed on the inner surfaces of the two walls. The electrodes are shown as rows and columns forming an X,Y matrix, but other forms are possible. For example, for r, θ displays the shape of a radial surface, or a sector corresponding to a digital seven-segment display. A layer 7 of liquid crystal material is contained between the walls 2 , 3 and the spacer ring 4 .

[0059] Polarizers 8, 9 are provided at the front and rear of the cell 1, respectively. Row driver 10 and column driver 11 apply voltage signals to the cells. Two sets of waveforms are generated and provided to the row driver 10 and the column driver 11 . The gate waveform generator 12 provides row waveforms, and the data waveform generator 13 supplies ON (connection) and OFF (disconnection)...

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PUM

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Abstract

The invention provides an addressing scheme with temperature compensation for temperature induced changes in liquid crystal material switching parameters. Temperature compensation is provided by measuring liquid crystal temperature, and varying the length of strobe waveforms accordingly. A ferroelectric liquid crystal cell is addressed by row and column electrodes forming an x,y matrix of display elements. A strobe waveform is applied to each row in sequence whilst appropriate data waveforms are applied to all the column electrodes. At each display element the material receives an addressing waveform to switch it to one of its two switched states depending upon the polarity of the addressing waveform. The data waveforms are e.g. alternating positive and negative pulses of period 2ts. The strobe waveform has a zero for one time period ts followed by a unipolar voltage pulse of significant duration e.g. equal to or greater than 0.25 ts or more. This may result in an overlapping of addressing in adjacent rows, e.g. the end of a strobe pulse on one row overlaps with the beginning of a strobe pulse on the next row. The display elements may be switched into one of their two states by one of two strobe pulses of opposite polarity. Alternatively a blanking pulse may switch all elements to one state and a strobe used to switch selected elements to the other state.

Description

technical field [0001] The present invention relates to temperature compensation of multi-channel addressable ferroelectric liquid crystal displays. This display uses tilted chiral smectic C.I. or F liquid crystal materials. Background technique [0002] Liquid crystal devices often consist of a thin layer of liquid crystal material sandwiched between two glass plates. Optically transparent electrodes are formed on the inner surfaces of the two glass plates. The electric field formed when a voltage is applied to these electrodes changes the molecular orientation of the liquid crystal molecules. Changes in molecular orientation can be easily observed and are the basis for forming many kinds of liquid crystal display devices. [0003] In a ferroelectric liquid crystal display device, i.e. a surface-stabilized ferroelectric liquid crystal device (SSFLC-N.A.Clark S.T.Lagerwall, App Phys Lett 36(11)1980pp 899-901), the molecules are controlled by the polarity of the applied el...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/133G09G3/36
CPCG09G2310/061G09G2320/0204G09G2320/041G09G2310/06G09G3/3629G09G2310/0205G09G3/36
Inventor J·R·休斯D·C·斯卡特古德M·J·托尔莱
Owner QINETIQ LTD
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