Bistable liquid crystal writing device with rapid electric drive display function and method

Abstract

The invention discloses a bistable liquid crystal writing device with a rapid electric drive display function and a method. The bistable liquid crystal writing device comprises a conductive layer, a liquid crystal layer and a substrate layer, wherein the substrate layer comprises a plurality of pixel electrodes arranged in an array shape, and each pixel electrode is correspondingly connected with one switch element group; each switch element group comprises two or more switch elements, each switch element is provided with an input end, an output end and a control end, the output ends of all the switch elements in each switch element group are connected, and the output ends of the switch element groups are connected with pixel electrodes; a control end, corresponding to the switch element, of each row of pixel electrodes is connected with a control wire; the input ends of the switch elements corresponding to each column of pixel electrodes are connected with two or more than two input wires according to a control requirement and a set rule, and the input ends of different switch elements of each column of single switch element group are connected with different input wires. The picture display time is greatly shortened, and the display speed is improved.

Description

technical field [0001] The invention relates to the technical field of bistable liquid crystal writing boards, in particular to a bistable liquid crystal writing device and method with fast electric drive display function. Background technique [0002] At present, in the field of liquid crystal writing display, there are four conventional technologies: [0003] The first is a touch display (LCD or LED or OLED, etc.), which must be powered on to achieve writing / displaying functions, and cannot write / display when powered off; its display depends on internally set backlight or self-luminous devices , has a certain damage to the user's eyesight, and it is easy to cause visual fatigue when used for a long time; its writing requires an additional input signal pressure detection device and a trajectory detection device, relying on an electromagnetic pen or a capacitive pen or finger for a capacitive screen. The detection of the writing pressure of the pen or capacitive pen or the ...

AI Technical Summary

Problems solved by technology

[0003] The first is a touch display (LCD or LED or OLED, etc.), which must be powered on to achieve writing / displaying functions, and cannot write / display when powered off; its display depends on internally set backlight or self-luminous devices , has a certain damage to the user's eyesight, and it is easy to cause visual fatigue when used for a long time; its writing requires an additional input signal pressure detection device and a trajectory detection device, relying on an electromagnetic pen or a capacitive pen or finger for a capacitive screen. The detection of the writing pressure of the pen or capacitive pen or the detection of the contact area between the finger and the screen generates an electrical signal to drive the change of the display state of the liquid crystal molecules to realize analog writing; the handwriting is not written by pressure, and the real writing feeling and writing effect cannot be restored;

[0004] The second type is electronic paper / electronic ink, which is made of polar materials inside, and the handwriting display is realized by reflecting the external light source, and it can still be maintained after the power is turned off; but it can only be written when the power is on, and its writing is not written by pressure. It is impossible to restore the real writing feeling and writing effect; at the same time, its writing requires additional input signal pressure detection devices and trajectory detection devices, relying on electromagnetic pens or capacitive pens or fingers for capacitive screens, using the force of the writing pressure of electromagnetic pens or capacitive pens Detection or detection of the contact area between the finger and the screen generates an electrical signal to drive the change of the display state of the liquid crystal molecules to realize analog writing; instead of using pressure to write, it is impossible to restore the real writing feeling and writing effect;

[0006] (1) According to the content to be displayed, the liquid crystal state corresponding to the pixel electrode is driven and set as the display state by means of progressive scanning, so as to realize the display of the content; however, due to the slow response speed of the bistable liquid crystal, this kind of The time required to realize the display in the driving mode is too long, and the update speed of the displayed content is slow, especially when the dynamic image is displayed, the delay phenomenon is obvious, and the visual experience is poor;

[0007] (2) First drive the area corresponding to all the pixel electrodes to the display state by voltage, and then according to the content to be displayed, drive the area corresponding to the set pixel electrode to the erasing state by voltage to realize The display of the content; compared with the method (1), although this method has improved the update speed of the displayed content, but all erasing in advance will affect the display effect and bring a bad visual experience;

[0008] (3) First, drive the liquid crystal corresponding to the single or multiple rows of pixel electrodes to the display state through voltage, and then drive the liquid crystal corresponding to the set pixel electrode to the erasing state through progressive scanning according to the content to be displayed. State, to realize the display of the content; the time required for this method is between the method (1) and the method (2), but it still cannot meet the requirements of the bistable liquid crystal writing device for fast display

However, the above-mentioned liquid crystal writing device can only be used as a writing interface to present written content by means of pressure writing, but cannot realize electrical signal-driven display

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