Array Substrate Touch Electrode Integration for Narrow Frame Displays
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Solution Overview
Problem
Existing touch display devices face challenges in narrowing the frame area as they develop higher Pixel Per Inch (PPI) due to increased size and number of drive circuits and signal lines required for touch position detection.
Innovation Solution
The implementation of an array substrate with a first touch electrode array and integrated circuit, where touch signal terminals directly connect to touch signal lines to supply drive signals to strip-shaped touch electrodes, reducing the need for additional driving circuitry in the frame area and allowing for narrower frames.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two layers of touch-electrode layers with multiple touch electrodes are used to detect touch position, then touch detection function is achieved, but the size and number of drive circuits and signal lines increase
Solution Approach 1:
The patent merges the touch electrode array with the display pixel array by using the same signal lines and drive circuits for both touch detection and display driving functions. The touch electrodes are integrated into the display substrate, sharing resources with the display function to reduce overall system complexity.
Solution Approach 2:
The signal lines and drive circuits are designed to serve dual purposes: driving display pixels and driving touch electrodes. The same data lines and scan lines are used for both display image rendering and touch position detection, making the system multi-functional without requiring separate dedicated circuits.
2Reliability
If more drive circuits and signal lines are added for touch position detection, then touch detection capability is improved, but the frame area increases
Solution Approach 1:
The touch electrode array is merged with the display pixel array structure, allowing both functions to share the same physical space and signal transmission paths. This integration eliminates the need for separate frame area dedicated to touch detection circuits.
Solution Approach 2:
The same data lines, scan lines, and drive circuits are used for both display and touch functions. The drive circuits can switch between driving display pixels and touch electrodes based on timing, eliminating the need for additional dedicated touch detection circuits in the frame area.
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 configuration enables the realization of narrower frames in touch display devices and panels by eliminating the need for additional driving circuitry, enhancing the integration of touch and display functions while maintaining effective touch position detection.
Implementation Method 1
when a user's finger touches the screen of the touch display device, the user's finger and some of the touch electrodes on the screen form a coupling capacitor, and leakage current flows out of the coupling capacitor
Data Source
AI summary
An array substrate includes a first touch electrode array having m number of strip-shaped first touch electrodes extending in a first direction, a first integrated circuit having m number of touch signal terminals, each of which provides a drive signal to a corresponding first touch electrode; and a plurality of first touch signal lines, each of which is connected between one of the touch signal terminals and one of the first touch electrodes for transmitting the drive signal supplied from each touch signal terminal to the corresponding first touch electrode. The drive signal includes a touch drive signal and a display drive signal; during a display stage, each touch signal terminal supplies the display drive signal to the corresponding first touch electrodes; and, during a touch detection stage, each touch signal terminal supplies the touch drive signal to the corresponding first touch electrode.