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Twisted nematic liquid crystal device with means for temperature compensation of operating voltage

A technology of liquid crystal display device and operating voltage, applied in static indicators, nonlinear optics, optics, etc., to achieve the effect of reducing the use of energy

Inactive Publication Date: 2004-12-15
TPO HONG KONG HLDG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Especially in portable devices, such as the aforementioned measuring devices and telephone devices, which are usually powered by batteries, this can lead to problems

Method used

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  • Twisted nematic liquid crystal device with means for temperature compensation of operating voltage
  • Twisted nematic liquid crystal device with means for temperature compensation of operating voltage
  • Twisted nematic liquid crystal device with means for temperature compensation of operating voltage

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Embodiment Construction

[0021] Figure 1 is a schematic cross-sectional view of a part of a liquid crystal display device comprising a liquid crystal cell 1 in which a twisted nematic liquid crystal material 2 is located between two support plates, or substrates 3 and 4, such as glass or quartz substrates, In this exemplary embodiment there are select electrodes 5 and data electrodes 6 . In this case, the liquid crystal material (such as MLC3700 from Merck) has positive optical anisotropy, positive dielectric anisotropy and low threshold voltage. If desired, the device includes polarizers (not shown), the polarization directions of which are, for example, mutually perpendicular. The device also includes alignment layers 7, 8 for orienting the liquid crystal material on the inner walls of the substrate so that the twist angle is eg 270°. The display device is of the transmissive type, but active switching elements may also be provided and connected to the image electrodes to drive the electrodes.

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PUM

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Abstract

A (super-) twisted nematic liquid crystal display device (1) is provided with means (10) for temperature compensation of the operating voltage by adjusting the operating voltage depending on the temperature dependent switching characteristic of a measuring element (9, 19), which can be a separate liquid crystal test cell or a pixel of the display. The temperature dependent switching characteristic is determined by measuring the switching or peak currents through, or the capacitance of, the measuring element.

Description

technical field [0001] The invention relates to a liquid crystal display device, comprising a first substrate provided with electrodes, a second substrate provided with electrodes, and a twisted nematic liquid crystal material between the two substrates, wherein the intersection of the electrodes is A portion defines a pixel. Background technique [0002] Liquid crystal display devices of this type are generally known and used in display screens such as alphanumeric display devices, in computing devices and measuring devices, for example, and in car radios and telephone devices. [0003] After the manufacture of such a liquid crystal display device is completed, the operating voltage is adjusted. The adjustment of the operating voltage is usually achieved by means of an external circuit, since the adjustment of the operating voltage is different for each display device due to eg different behavior of the liquid crystal material or other parts in the display device. This ad...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/133G09G3/20G09G3/36
CPCG09G2320/029G09G2320/041G09G3/3622G02F1/133
Inventor A·J·G·勒伊特
Owner TPO HONG KONG HLDG