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Teaching screen

A screen and cholesteric liquid crystal technology, applied in optics, nonlinear optics, instruments, etc., can solve the problems that TN liquid crystal cannot be applied to flexible panels and use restrictions, and achieve the effect of power saving display color and changeable display color

Inactive Publication Date: 2019-07-19
IRIS OPTRONICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, TN liquid crystals cannot be applied to flexible panels, and their use is severely restricted

Method used

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Embodiment Construction

[0029] Preferred embodiments of the teaching screen according to the present invention will be described below with reference to the relevant drawings, wherein the same components will be described with the same reference numerals.

[0030] The teaching screen of the present invention can be, for example but not limited to, a mobile phone with a touch function, a tablet or an electronic whiteboard, or other display devices capable of displaying images. In the following embodiments, the teaching screen is, for example, an electronic whiteboard, especially a large-sized electronic whiteboard, and can communicate with other electronic devices. In some embodiments, the display screen of the teaching screen of the present invention can be synchronously displayed on other electronic devices through a network connection; or, the display screens of other electronic devices can be synchronized on the teaching screen of the present invention via the network show.

[0031] The teaching ...

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PUM

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Abstract

The invention discloses a teaching screen. The teaching screen comprises a first cholesterol liquid crystal electronic paper unit, a second cholesterol liquid crystal electronic paper unit and a control unit; the first cholesterol liquid crystal electronic paper unit and the second cholesterol liquid crystal electronic paper unit are arranged in an overlapped mode and display a first color and a second color correspondingly; the pressing face of the teaching screen is pressed to generate a pressing track; when the control unit applies the first sustaining voltage to the first cholesterol liquid crystal electronic paper unit, the pressing track presents the second color; and when the control unit applies the first clearing voltage greater than the first sustaining voltage to the first cholesterol liquid crystal electronic paper unit, the pressing track of the first color is cleared, and the first sustaining voltage is between 0 V and 4.5 V or between 35.4 V and 47.6 V.

Description

technical field [0001] The present invention relates to a teaching screen, and more particularly to a teaching screen of cholesteric liquid crystal electronic paper. Background technique [0002] A twisted nematic (TN) liquid crystal display panel is a common and low-cost liquid crystal display structure. However, the TN liquid crystal display panel is a transmissive display. If no voltage is applied, the light entering the liquid crystal element will advance with the twisting direction of the liquid crystal molecules. Because the upper and lower polarizers and the alignment film are in the same direction, the light can pass through to form a bright On the contrary, if a voltage is applied, the liquid crystal molecules are arranged in the direction of the applied electric field, perpendicular to the alignment film arrangement (homogeneous), then the light cannot pass through the second polarizer, forming a dark state. In other words, the TN liquid crystal display panel must...

Claims

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Application Information

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IPC IPC(8): G02F1/1347G02F1/1333G09G3/36
CPCG02F1/13338G02F1/1347G09G3/36
Inventor 廖奇璋古俊纲李承璋曾衡逸吴炳升张俊彦
Owner IRIS OPTRONICS INC
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