Display Panel Conductive Layer Design for Touch Integration
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Solution Overview
Problem
Existing display panels face challenges in simultaneously providing both image display and touch functions without significant design changes, leading to increased development time and component sharing issues between display and touch display devices.
Innovation Solution
A display panel design that includes separate conductive layers for data and common voltage lines, allowing for the simultaneous driving of common electrodes and minimizing design changes, enabling both image display and touch functions in a portion of the panel while maintaining only image display in the remaining portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a display panel is designed to provide both image display and touch functions, then the functionality is improved, but the design complexity increases
Solution Approach 1:
The display panel is divided into a display area for image display and a non-display area containing pad portions for touch functions. Separate conductive layers are used: a first conductive layer for data lines in the display area and a second conductive layer for common voltage lines in the non-display area, allowing independent design and optimization of each region without increasing overall complexity
Solution Approach 2:
The common voltage lines in the non-display area serve dual purposes: they drive common electrodes for image display in the display area and simultaneously serve as touch sensing electrodes in the touch area. This multi-functionality enables the panel to provide both image display and touch functions without requiring separate dedicated circuits for each function
2Adaptability or versatility
If a display panel is designed for touch display functionality, then the versatility is improved, but the development time increases
Solution Approach 1:
The display panel is pre-configured with pad portions in the non-display area that include second pads electrically connected to common voltage lines. These pad portions are designed in advance with the same structure as the display area, allowing the panel to be directly used for touch display applications without requiring post-manufacturing modifications or redesign, thus reducing development time
Solution Approach 2:
The same base panel design can be adapted for different applications by changing the configuration of conductive layers in the non-display area. For image display only, the conductive layers are configured for data line driving. For touch display, the conductive layers are reconfigured to include common voltage lines connected to touch electrodes, allowing rapid adaptation without redesigning the entire panel
3Measurement precision
If common electrodes are driven individually, then the control precision is improved, but the device complexity increases
Solution Approach 1:
Multiple second pads electrically connected to common voltage lines are connected to each other through a conductive layer in the non-display area. This merging allows multiple common electrodes to be driven simultaneously with the same voltage signal, simplifying the control circuitry while maintaining precise control over the common electrode potential for both image display and touch sensing functions
Data Source
AI summary
Discussed are a display panel which can be applied to a touch display device by changing a design of a conductive layer to electrically connect a plurality of pads to a plurality of common electrodes, and a display device and a touch display panel device thereof.