Touch Display Electrode Layout for Electric Field Shielding
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Solution Overview
Problem
Existing display devices with built-in touch sensors face challenges in maintaining display quality due to electrical field interference and require complex connections for sensor electrodes, which can lead to partial electrical floating and degradation in both touch sensing and image display modes.
Innovation Solution
A display device configuration featuring a first and second common electrode, a metal line between them, and a feed line in the non-display portion, where the metal line is connected to the feed line at both ends, ensuring continuous voltage application and shielding against electrical fields, reducing the need for direct connections to signal sources and minimizing electrical floating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sensor electrodes are directly connected to signal sources in touch sensing mode, then touch sensing function is achieved, but electrical field interference degrades display quality
Solution Approach 1:
A shield electrode is introduced as an intermediary component between the sensor electrode and the signal source. The shield electrode is connected to a fixed potential (ground or reference potential) and serves to block or reduce electrical field interference from reaching the sensor electrode, thereby protecting display quality while allowing touch sensing to function through the signal line.
2Reliability
If multiple connection terminals are used for sensor electrodes, then electrical connections are established, but device complexity increases
Solution Approach 1:
The shield electrode structure is designed to extend continuously across multiple sensor electrodes, allowing a single shield electrode to serve multiple sensing elements. This merging approach reduces the number of separate connection terminals needed, as one continuous shield structure can protect multiple sensor electrodes simultaneously, thereby simplifying the overall connection architecture.
3Object-affected harmful factors
If shield electrode is connected to fixed potential, then electrical field shielding is achieved, but voltage application complexity increases
Solution Approach 1:
The shield electrode is designed to serve multiple functions simultaneously: it provides electrical field shielding for touch sensing operation, acts as a reference potential plane for stable voltage application to pixel electrodes, and can function as a common electrode in display mode. This multi-functionality eliminates the need for separate shielding structures, thereby reducing overall voltage application complexity despite the added shielding capability.
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 effectively suppresses display quality degradation by ensuring consistent voltage application and shielding, reducing the number of connection terminals and preventing partial electrical floating, thus enhancing both touch sensing and image display performance.
Implementation Method 1
a metal line between them, and a feed line in the non-display portion, where the metal line is connected to the feed line at both ends, ensuring continuous voltage application and shielding against electrical fields
Data Source
AI summary
According to one embodiment, a display device includes a first common electrode and a second common electrode arranged in a first direction and separated from each other, a signal line located between the first common electrode and the second common electrode and extending in a second direction crossing the first direction, a pixel electrode electrically connected to the signal line and overlapping the first common electrode, and a first metal line located between the first common electrode and the second common electrode, overlapping the signal line, and extending in the second direction. The first metal line is applied a predetermined voltage from a plurality of connection portions.