Touch electrode layer and touch display device

Abstract

The invention provides a touch electrode layer and a touch display device. The touch electrode layer is provided with a first electrode and a second electrode, the first electrode is provided with a first electrode trunk and a plurality of first electrode branches which are obliquely arranged along the first electrode trunk; the second electrode is provided with a second electrode trunk and a plurality of second electrode branches obliquely arranged along the second electrode trunk, the first electrode and the second electrode are both arranged to be of a symmetrical structure, and the inclination angles of the first electrode branches and the second electrode branches are the same. In the touch electrode unit, the first electrodes and the second electrodes are almost the same in shape andsize, and the first electrode branches and the second electrode branches which are arranged in a crossed mode are also almost the same in shape and size. The mutual capacitance value between the touch driving electrodes and the touch sensing electrodes can be effectively improved, meanwhile, a mutual capacitance electric field in the whole touch screen structure is distributed more evenly, and the resolution 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 touched by the finger. 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-emitting diode (AMO...

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 packaging layer. However, due to the thin packaging 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 large RC delay and reducing the touch Sensitivity

And the current flexible AMOLED display, and the material of the touch electrode is usually a hollow metal grid material, its conductive area is compared with the traditional full-surface transparent ITO material touch electrode, its actual effective conductive electrode area is smaller, so the touch The mutual capacitance inductance between the electrodes TX and RX is very small, resulting in a smaller capacitance change when touched by a finger, which is not easily detected by the touch chip

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