Ultrathin bendable capacitive touch screen and preparation method thereof

Abstract

The invention provides an ultrathin bendable capacitive touch screen. The display screen comprises a transparent polyimide layer, an upper Ag grid electrode wire, an upper OC insulating layer, a lowerAg grid electrode wire, a lower OC insulating layer, an OCA optical adhesive layer and a display screen polarizer, wherein the transparent polyimide layer is connected with the OCA layer and the upper OC insulating layer, one side of the lower OC insulating layer is connected with the upper OC insulating layer, and the other side of the lower OC insulating layer is connected with the display screen polarizer; the upper Ag grid electrode wires are symmetrically arranged on the upper OC insulating layer, and the lower Ag grid electrode wires are symmetrically arranged on the lower Ag grid electrode wires. According to the invention, the thickness problem and the bendable foldability of the ultrathin touch screen are solved, and the thickness of the touch screen can be ultrathin to 0.015 mm;meanwhile, the touch screen can be greatly folded and bent, the bending diameter phi can be as low as 2mm, the touch sensitivity can be greatly improved, and the touch screen can be used for manufacturing large-size touch screens.

Description

technical field [0001] The invention relates to the technical field of optical equipment, in particular to an ultra-thin bendable capacitive touch screen and a preparation method thereof. Background technique [0002] With the widespread popularization of smart phones, foldable and bendable display technology is also developing continuously in recent years. Foldable and bendable display screens are also introducing new ones. The touch screen is a magnetron sputtering ITO film layer on the PET film. The ITO is etched into a touch pattern electrode. The upper and lower layers of the PET film with ITO electrodes are bonded together to form a touch sensor. Bending within a certain range, the ITO film is prone to brittle failure when it is folded and bent in a large range, and the crease of the PET film is relatively obvious, so it cannot be widely used in the foldable touch display market. [0003] Ordinary foldable touch screen is composed of upper and lower layers of PET fi...

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Problems solved by technology

[0005] However, the prior art has the following problems: 1. Since the thinnest PET film is 0.05mm in thickness, the thickness of the entire touch-sensitive sheet is 0.15mm, and the thickness cannot be made into an ultra-thin type; 2. The folding flexibility is poor, and the bending range is small , can not be folded and bent by a large margin; 3. Due to the relatively large square resistance of ITO, the touch sensitivity is poor, and it is not suitable for making large-sized touch screens

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