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Electric drawing paper capable of being repeatedly written

An electronic drawing and substrate technology, applied in the field of electronic drawing paper, can solve the problems of insufficient transparency, complex electrode setting, complex process, etc., and achieve the effect of low driving voltage, good handwriting effect and clear font

Pending Publication Date: 2019-01-04
JIANGSU HECHENG DISPLAY TECHCO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, Chinese patent CN102654708A discloses a handwritten electronic paper display, including: a first electrode substrate and a second electrode substrate with the same pixel electrode lattice structure, electronic paper film, flexible circuit board, stylus and power supply, and its electrodes The setting is more complicated, and the writing device (such as a stylus) must also be connected to the power supply, the process is complicated and the cost is high
Another example is that when the cholesteric liquid crystal is in the planar state, according to the Bragg reflection principle, it reflects light of a specific wavelength, and in the focal conic state, it has the characteristics of translucency and semi-scattering, which makes the liquid crystal display device in this state have high haze and insufficient transparency. , is not conducive to depicting

Method used

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  • Electric drawing paper capable of being repeatedly written
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  • Electric drawing paper capable of being repeatedly written

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Select two pieces of transparent PET material with a conductive layer, the thickness of the PET film used as the upper substrate is 125 μm, and the thickness of the PET film used as the lower substrate is 188 μm.

[0052] Weigh 5g of liquid crystal material, wherein the weight ratio of smectic A phase liquid crystal is 73%, and the weight ratio of polymer is 27%. Coating between two transparent PET materials, control the coating thickness to 12μm. The smectic A phase material is produced by Jiangsu Hecheng Display Co., Ltd., and the model is HJC50600-000. The polymer is composed of two polymer monomers, which are purchased from Chengdu Thomas Technology Co., Ltd., the model is 4409-8 polymer and polymer monomer LA purchased from Shanghai Bofeng Trading Co., Ltd., the two polymers The mass ratio of the monomers is 9:1.

[0053] After coating evenly, polymerize under ultraviolet light for 5 minutes.

[0054] When a voltage of 90V is applied, the electronic drawing pape...

Embodiment 2

[0056] Select two pieces of transparent PET material with a conductive layer, the thickness of the PET film used as the upper substrate is 125 μm, and the thickness of the PET film used as the lower substrate is 188 μm.

[0057] Weigh 5g liquid crystal material, wherein smectic A phase liquid crystal 73%, polymer 27% and account for the black dichroic dye of 0.75% of liquid crystal material gross weight, described liquid crystal material is mixed uniformly to form coating, utilizes rolling bar formula again ( Roll-to-roll) method is used to apply the coating between two transparent PET materials, controlling the thickness of the coating to 12 μm. Both the smectic A phase material and the dye are produced by Jiangsu Hecheng Display Co., Ltd., and the models are HJC50600-000 and RL-1 respectively. The polymer is composed of two polymer monomers, which are purchased from Chengdu Thomas Technology Co., Ltd., the model is 4409-8 polymer and polymer monomer LA purchased from Shangha...

Embodiment 3

[0061] Select two pieces of transparent PET material with a conductive layer, the thickness of the PET film used as the upper substrate is 125 μm, and the thickness of the PET film used as the lower substrate is 188 μm.

[0062] Weigh 5g of liquid crystal material, wherein 74% of smectic A phase material, 26% of polymer and black dichroic dye accounting for 1% of the total weight of liquid crystal material, the liquid crystal material is mixed uniformly to form coating, and then roll-to- The coating was coated between two transparent PET materials by roll method, and the thickness of the coating was controlled to be 8 μm. Smectic A phase materials and dyes are produced by Jiangsu Hecheng Display Co., Ltd., and the models are HJC50600-001 and RL-2. The polymer components are the same as in Example 1.

[0063] After coating evenly, polymerize under ultraviolet light for 4 minutes.

[0064] When a voltage of 80V is applied, the electronic drawing paper is in a transparent state...

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Abstract

The invention discloses an electric drawing paper capable of being repeatedly written, which comprises an upper substrate, a lower substrate and a liquid crystal mixed layer sandwiched between the upper substrate and the lower substrate. The upper substrate is a flexible transparent substrate, and the lower substrate is a flexible, semi-flexible or rigid transparent substrate; the liquid crystal mixed layer at least contains liquid crystal and a polymer; and a transparent conductive layer is arranged on one side of the upper substrate and the lower substrate in contact with the liquid crystalmixed layer. The electric drawing paper capable of being repeatedly written in the invention is in a transparent state and can be placed on a pattern, a character and even a 3D object; the pattern andthe character or details of the object can be clearly seen; meanwhile, the electric drawing paper capable of being repeatedly written has the advantages of high contrast, low driving voltage, and good handwriting effect, is suitable for human handwriting comfort, clear font, no diffusion, and can be used in fields such as copying and depicting.

Description

technical field [0001] The invention belongs to the field of liquid crystal display, and in particular relates to a rewritable electronic drawing paper. Background technique [0002] In the field of liquid crystal displays, bistable liquid crystal displays have gradually become mainstream due to their extremely low power consumption. After the bistable liquid crystal display displays text or images, it can keep the text or images for a long time without energy support until it is switched to the next content, so the energy consumed for long-term display is greatly saved. [0003] In recent years, research on bistable liquid crystal displays has mainly focused on cholesteric liquid crystal materials. Cholesteric liquid crystal itself has several different states, including the vertical state in which the liquid crystal molecules are parallel to the electric field under the electric field, and two stable states that do not require an external electric field: the planar state ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/137
CPCG02F1/13718
Inventor 周振婷王盼盼丁文全
Owner JIANGSU HECHENG DISPLAY TECHCO