Touch Display Electrode Area Gradient for Capacitance Uniformity
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Solution Overview
Problem
Conventional touch display panels suffer from poor accuracy in touch detection due to varying touch detection capacitances along the extending direction of touch display wires, leading to decreased accuracy in touch control and display functionality.
Innovation Solution
The touch display substrate design features a common electrode layer with touch display electrodes arranged in an array, where the areas of the electrodes increase gradually along the extending direction of the touch display wires, ensuring equal total capacitance for each touch display unit, thereby reducing differences in touch detection capacitances and improving accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the common electrode layer is divided into multiple touch display electrodes with uniform areas, then the manufacturing process is simple, but the touch detection capacitances vary along the extending direction of touch display wires, resulting in poor touch detection accuracy
Solution Approach 1:
The patent applies local quality by making the areas of touch display electrodes non-uniform along the extending direction of touch display wires. Specifically, electrodes closer to one end of the wire have smaller areas while electrodes farther away have larger areas, creating a gradient distribution. This local variation in electrode area compensates for the capacitance differences caused by wire length variations, ensuring that total capacitances (electrode + wire) remain substantially equal across all touch display units, thereby improving touch detection accuracy.
2Ease of manufacture
If separate touch panels and display panels are manufactured and then attached, then the manufacturing processes are independent and simple, but the manufacturing cost increases and production efficiency decreases
Solution Approach 1:
The patent merges the touch display electrode layer with the display panel's common electrode layer into a single integrated structure. The touch display electrodes are formed in the same common electrode layer that serves both touch sensing and display functions, eliminating the need for separate touch panel and display panel manufacturing and assembly processes. This integration significantly improves production efficiency while maintaining process simplicity through unified fabrication.
3Ease of manufacture
If separate touch panels and display panels are manufactured and then attached, then the manufacturing processes are independent and simple, but the panel thickness increases
Solution Approach 1:
The patent merges the touch display electrode layer with the display panel's common electrode layer into a single integrated structure. The touch display electrodes are formed in the same common electrode layer that serves both touch sensing and display functions, eliminating the need for separate touch panel and display panel manufacturing and assembly processes. This integration significantly improves production efficiency while maintaining process simplicity through unified fabrication.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design enhances the accuracy of touch detection by maintaining consistent touch detection capacitances along the touch display units, reducing differences to less than 1%, thereby improving the overall touch detection precision.
Implementation Method 1
a total capacitance of one touch display electrode and a touch display wire corresponding to the one touch display electrode is equal to a total capacitance of another display electrode and a touch display wire corresponding to the another touch display electrode
Data Source
AI summary
An electronic device, a touch display panel and a touch display substrate are provided. The touch display substrate includes a substrate plate and a common electrode layer disposed on the substrate plate, where the common electrode layer includes multiple touch display electrodes insulated from each other, and the touch display electrodes are arranged in an array, and multiple touch display wires insulated from each other, where the touch display wires and the touch display electrodes are arranged and connected electrically according to a one-to-one correspondence. Areas of at least two touch display electrodes increase gradually in a first direction, and the first direction is an extending direction of the touch display wire and extends from a contact point between the touch display wire and the touch display electrode to an edge of the substrate plate.