Touch Sensor Electrode Layout for Display 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, leading to potential degradation in 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 consistent voltage application and shielding against electrical fields in both touch sensing and image display modes, reducing the need for direct connections to signal sources.
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 in image display mode
Solution Approach 1:
The patent segments the common electrode into multiple separate common electrodes (first common electrode, second common electrode, etc.) arranged in different regions. Each common electrode can be independently controlled, allowing the display device to apply different voltages to different regions. This segmentation enables the system to maintain touch sensing functionality in certain regions while suppressing electrical field interference in display regions, thus resolving the contradiction between touch sensing reliability and display quality.
Solution Approach 2:
The patent applies different voltage conditions to different common electrodes based on their local functions. Common electrodes in touch sensing regions are connected to signal sources for touch detection, while common electrodes in display regions are connected to voltage sources for display quality maintenance. This local differentiation allows each region to have optimized electrical characteristics, eliminating electrical field interference in display areas while preserving touch sensing capability in sensor areas.
2Measurement precision
If multiple common electrodes are used for touch sensing, then touch detection accuracy is improved, but the number of connection terminals increases
Solution Approach 1:
The patent designs common electrodes to serve multiple functions: they act as sensor electrodes for touch sensing and as common electrodes for display operation. By making the common electrodes multi-functional, the patent eliminates the need for separate sensor electrodes and their associated connection terminals. The same electrode structures are used for both touch detection and display purposes, reducing terminal count while maintaining touch detection accuracy through the segmented multi-electrode configuration.
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, thereby improving the reliability of touch sensing and image display while reducing the number of connection terminals required.
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 consistent voltage application and shielding against electrical fields
Data Source
AI summary
A display device includes first and second common electrodes arranged in a first direction and separated from each other, a signal line located between the first and second common electrodes 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, a first metal line located between the first and second common electrodes and extending in the second direction, and a third common electrode arranged and extending in the second direction and separated from the first common electrode, overlapping the signal line. The first metal line is applied a predetermined voltage from plural connection portions, and includes arranged in the second direction a first line portion adjacent and electrically connected to the first common electrode and a second line portion, separated from the first line portion, and adjacent and electrically connected to the third common electrode.