Overlapping Electrode Lines for Display Panel Touch Sensing
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Solution Overview
Problem
In large in-cell type display devices, the increasing number of touch electrodes and touch lines leads to reduced transmittance and a corresponding increase in the number of driver ICs, which complicates the structure and functionality of the display panel.
Innovation Solution
The display panel incorporates first electrodes used as both common and touch electrodes, with second electrodes acting as common electrodes during image display and being electrically isolated, and alternately arranged with first electrodes, reducing the number of driver ICs and electrode lines required.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the number of touch electrodes is increased to cover a larger display area, then the touch sensing coverage is improved, but the number of touch lines and driver ICs increases exponentially, leading to reduced transmittance and increased device complexity
Solution Approach 1:
The patent merges the common electrode and touch electrode functions into a single first electrode that serves both purposes simultaneously. This eliminates the need for separate common electrodes and reduces the number of electrode lines required, directly addressing the complexity issue while maintaining full display area coverage for touch sensing
Solution Approach 2:
The first electrode is designed to perform multiple functions: it acts as a common electrode during image display periods and as a touch electrode during touch sensing periods. This multi-functionality reduces the total number of electrodes and lines needed, thereby reducing device complexity while maintaining comprehensive coverage
2Reliability
If the number of touch lines is increased to connect more touch electrodes, then the touch sensing capability is improved, but the transmittance of the display panel is reduced
Solution Approach 1:
By merging the common electrode and touch electrode into a single first electrode, the patent reduces the total number of electrode lines needed to connect to the display area. Fewer lines mean less light blocking, thereby improving transmittance while maintaining full touch sensing coverage through the multi-functional electrode
Solution Approach 2:
The patent employs periodic switching between image display mode and touch sensing mode. During image display, the first electrode functions as a common electrode; during touch sensing, it functions as a touch electrode. This periodic alternation allows the same electrode structure to serve multiple purposes without requiring additional lines, thus improving transmittance while maintaining touch capability
3Reliability
If the number of driver ICs is increased to supply touch signals to more electrodes, then the touch sensing coverage is improved, but the structure of the display panel is complicated
Solution Approach 1:
The first electrode serves as both a common electrode and a touch electrode, allowing a single electrode structure to be controlled by driver ICs for multiple functions. This reduces the total number of electrodes that need to be connected to driver ICs, thereby simplifying the overall driver IC structure while maintaining comprehensive touch sensing coverage
Solution Approach 2:
By combining the common electrode and touch electrode functions into one electrode, the patent reduces the total number of electrical connections required to the driver ICs. This merging effect simplifies the driver IC structure and reduces the complexity of the overall display panel system
Data Source
AI summary
Disclosed is a display panel. The display panel includes a plurality of first electrodes, a plurality of second electrodes, a plurality of first electrode lines, and a plurality of second electrode lines. The first electrodes are provided in a display part and are used as a common electrode and a touch electrode. The second electrodes are used as the common electrode and each second electrode is disposed adjacent to at least one of the first electrodes. The first electrode lines extend to a non-display part disposed outside the display part and are each connected to a corresponding one of the first electrodes. The second electrode lines extend to the non-display part and are connected to at least two of the second electrodes and supply a common voltage to the second electrodes connected to the second electrode lines.