Ultrathin flexible capacitive touch sensor based on graphene and preparation method thereof

Abstract

The invention discloses an ultrathin flexible capacitive touch sensor based on graphene. The sensor comprises an ultrathin flexible membrane, the ultrathin flexible membrane includes a surface a and a surface b; the surface a and the surface b are each provided with a channel electrode; a first conductive layer is arranged on the surface a, the first conductive layer is connected with a capacitive induction chip of a capacitive touch sensor through the channel electrode arranged on the surface a, the first conductive layer is formed by patterning one layer or multiple layers of graphene membranes; a first optical rubber layer is arranged on the surface of the first conductive layer; a second conductive layer is arranged on the surface b, the second conductive layer is connected with the capacitive induction chip of the capacitive touch sensor through the channel electrode arranged on the surface b, the second conductive layer is formed by patterning one layer or multiple layers of graphene membranes; and a second optical rubber layer is arranged on the surface of the second conductive layer.

Description

technical field [0001] The invention relates to an ultra-thin flexible capacitive touch sensor, which belongs to the field of graphene electronic device manufacturing. Background technique [0002] Because the traditional capacitive touch sensor uses the traditional material ITO, it cannot achieve better flexibility. Similarly, because the ITO film is fragile, when making a touch sensor, it is very easy to cause sudden changes in the properties of ITO due to bending, such as conductive In this case, the only way to reduce the bending during the manufacturing process is to increase the thickness of the ITO and the substrate, but this will lead to an increase in the overall thickness, and the ultra-thin device structure cannot be achieved. However, with the vigorous development of flexible electronics and wearable industries, the demand for ultra-thin and ultra-flexible capacitive touch sensors is increasing. Existing solutions are generally based on ITO, by coating ITO film o...

AI Technical Summary

Problems solved by technology

[0002] Because the traditional capacitive touch sensor uses the traditional material ITO, it cannot achieve better flexibility. Similarly, because the ITO film is fragile, when making a touch sensor, it is very easy to cause sudden changes in the properties of ITO due to bending, such as conductive In this case, the bending in the manufacturing process can only be reduced by increasing the thickness of the ITO and the substrate, but this will lead to an increase in the overall thickness, and the ultra-thin device structure cannot be realized.

However, with the vigorous development of flexible electronics and wearable industries, the demand for ultra-thin and ultra-flexible capacitive touch sensors is increasing. Existing solutions are generally based on ITO, by coating ITO film on both sides and processing patterns or using single Surface bridging structure can produce a capacitive touch sensor with a minimum bending radius of about 5 mm and an overall thickness of no less than 125 microns. However, the process is complicated, the cost is high, and the yield rate is low, which cannot meet the needs of the market.

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