Graphene capacitive touch screen with pressure induction function

A capacitive touch screen and graphene technology, applied in the direction of electrical digital data processing, input/output process of data processing, instruments, etc., can solve problems such as difficult to support touch parameter perception

Active Publication Date: 2016-04-20
CHONGQING INST OF GREEN & INTELLIGENT TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, capacitive touch screens at this stage include graphene touch screens, which only sense the touch position on the plane (X, Y axis two-dimensional space) where the screen body is located, and it is difficult to support the perception of touch parameters perpendicular to the screen body plane (Z axis), that is, pressure induction

Method used

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  • Graphene capacitive touch screen with pressure induction function
  • Graphene capacitive touch screen with pressure induction function
  • Graphene capacitive touch screen with pressure induction function

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Experimental program
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Embodiment 1

[0017] The device structure of the pressure-sensitive graphene capacitive touch screen of the present embodiment is as follows figure 1 As shown, the upper graphene transparent conductive film layer 103 and the lower graphene transparent conductive film layer 104 are all made of CVD growth graphene, and are transferred to the flexible PET substrate by a large area transfer method, and the number of layers of the graphene is 1 layer, the square resistance is 200Ω / sq, and the light transmittance range is 91%.

[0018] In this embodiment, the patterning of the graphene transparent conductive film is realized by photolithography and etching.

[0019] In this embodiment, the graphene capacitive touch screen also includes a pressure-sensitive polymer elastomer 104, and the upper graphene transparent conductive film layer 103 and the lower graphene transparent conductive film layer 105 are respectively positioned on the pressure-sensitive polymer elastomer. 104 upper and lower surfa...

Embodiment 2

[0028] The device structure of the pressure-sensitive graphene capacitive touch screen of the present embodiment is as follows image 3 As shown, the upper graphene transparent conductive film layer 303 and the lower graphene transparent conductive film layer 304 are all made of CVD grown graphene, and transferred to the flexible PI substrate by a large area transfer method, the graphene layer The number is 3 layers, the square resistance is 100Ω / sq, and the light transmittance range is 85%.

[0029] In this embodiment, the graphene capacitive touch screen also includes a pressure-sensitive polymer elastomer 304, and the upper graphene transparent conductive film layer 303 and the lower graphene transparent conductive film layer 305 are located on the pressure-sensitive polymer elastomer respectively. 304 upper and lower surfaces.

[0030] In this embodiment, the pressure-sensitive polymer elastomer 304 is made of TPU material with a thickness of 200 um, and the surface is no...

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Abstract

A graphene capacitive touch screen with the pressure induction function structurally comprises a cover plate layer, an OCA optical adhesive layer a, an upper graphene transparent conductive thin film layer, a lower graphene transparent conductive thin film layer, a pressure sensitive polymer elastomer, an OCA optical adhesive layer b, a display module, a peripheral circuit, an interface chip a, a peripheral circuit, an interface chip b and a main control chip. The transparent insulating polymer elastomer is arranged between the two graphene transparent conductive thin film layers to adapt to changes of external touch pressure. In the working process, local deformation of the polymer elastomer is caused by touch pressure, changes of local capacitance are caused accordingly, and thus the touch pressure is worked out. In addition, by means of the micro-nano structure design of the polymer elastomer, the pressure induction sensitivity can be improved. The graphene capacitive touch screen achieves pressure induction, has the advantages of being foldable, high in sensitivity, light, thin, high in light transmittance and conductivity, low in cost and environmentally friendly, and lays a foundation for a novel touch device.

Description

technical field [0001] The invention belongs to the field of electronic information technology touch screens, in particular to a graphene capacitive touch screen with pressure sensitivity. Background technique [0002] Touch screen, also known as "touch screen" and "touch panel", has become a personal mobile communication device and comprehensive information terminal such as smart phone, tablet computer, smart phone, The main means of human-computer interaction such as ultra-notebook computers, wearable devices, and operation interfaces of machine equipment. According to different working principles, touch screens can be divided into four main types: capacitive touch screens, resistive touch screens, infrared touch screens and surface acoustic wave touch screens. Among them, the capacitive touch screen has a series of advantages such as multi-touch, fast response time, long service life, high light transmittance and superior user experience. At the same time, with the grad...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F3/044G06F3/041
CPCG06F3/0412G06F3/0414G06F3/044G06F2203/04103
Inventor 杨俊罗伟魏大鹏魏兴战史浩飞杜春雷
Owner CHONGQING INST OF GREEN & INTELLIGENT TECH CHINESE ACADEMY OF SCI
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