Touch electrode layer and touch display device

Abstract

The invention discloses a touch electrode layer and a touch display device. The touch display layer comprises a plurality of touch electrode units which are arranged in an array and are electrically connected; each touch electrode unit comprises a first electrode and a second electrode; the first electrode is provided with a first electrode branch with a first branch widening part; the second electrode is provided with a second electrode branch with a second electrode widening part; a first electrode branch of the first electrode and a second electrode branch of the second electrode are arranged in a staggered and coupled manner; according to the touch screen structure, the first electrodes and the second electrodes are arranged, the virtual electrodes are arranged in the first electrodesand the second electrodes, the mutual capacitance induction quantity between the touch driving electrodes and the touch induction electrodes can be effectively increased, meanwhile, mutual capacitanceelectric fields in the whole touch screen structure are distributed more evenly, and the resolution ratio and accuracy of touch position detection can be better improved.

Description

technical field [0001] The present invention relates to the field of touch display, in particular to a touch electrode layer and a touch display device. Background technique [0002] Capacitive touch screens are widely used in various electronic interactive scene devices due to their high durability, long life, and support for multi-touch functions. Capacitive touch screen detects the specific position touched by the finger by detecting the change of capacitance at the position where the finger touches the screen. Therefore, when the amount of capacitance change caused by touch is small, the traditional capacitive touch screen may not be able to accurately detect whether there is a touch input. [0003] Since the structural design of the touch screen is a very important factor for detecting the capacitance change, it is very necessary to develop a touch screen design capable of detecting a small capacitance change. At present, for flexible active-matrix organic light-emitt...

AI Technical Summary

Problems solved by technology

At present, for flexible active-matrix organic light-emitting diode (AMOLED) displays, the touch electrode patterns usually need to be directly fabricated on the upper surface of the thin-film encapsulation layer. However, due to the thinner encapsulation layer (usually Thickness <10um), so the distance between the touch electrode and the cathode is small, resulting in a large parasitic capacitance between the driving electrode (Tx) / sensing electrode (Rx) and the cathode, resulting in a relatively large resistance-capacitance (RC) delay Big, reduce touch sensitivity

At present, the touch electrodes of flexible AMOLED displays are usually hollow metal grids (Metal Mesh), and its conductive area is relatively large compared to the actual effective conductive electrodes of traditional touch electrodes made of transparent indium tin oxide layer (Indium Tin Oxide, ITO). The area is small, so the mutual capacitance between the driving electrode (Tx) and the sensing electrode (Rx) is very small, resulting in a smaller capacitance change when touched by a finger, which is not easy to be detected by the touch chip (Touch IC) arrive

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