Display Device Electrode Layout for Accurate Touch Sensing
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Solution Overview
Problem
Existing display devices often experience malfunctions due to interference between input sensors and display panels, leading to inaccurate input detection.
Innovation Solution
The display device incorporates a specific electrode configuration with first and second electrodes extending in different directions, including sensing portions and bridges, along with a dummy electrode to enhance input sensing accuracy and prevent malfunctions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a touch panel is added to enable information input, then input functionality is improved, but interference between the input sensor and display panel occurs causing malfunctions
Solution Approach 1:
The first electrode is divided into multiple sensing portions (first sensing portions and second sensing portions) that are disposed with the first main portion therebetween. This segmentation allows the electrode to function both as a display electrode and as multiple independent sensing zones, enabling input functionality while reducing interference through distributed sensing areas.
Solution Approach 2:
The first electrode serves dual functions: it acts as both a display electrode for the display panel and as a sensing electrode for the touch panel. By making the first electrode multi-functional, the patent eliminates the need for separate electrodes, reducing overall system complexity and potential interference sources while maintaining both display and input capabilities.
2Measurement precision
If electrodes are extended in multiple directions to improve sensing coverage, then input detection capability is improved, but electrode complexity increases
Solution Approach 1:
The first electrode extending in the first direction serves both as a display electrode and as a sensing electrode with multiple sensing portions. This multi-functionality allows comprehensive sensing coverage without requiring additional dedicated sensing electrodes, thereby improving input detection capability while avoiding increased electrode complexity.
Solution Approach 2:
The sensing portions extend in both the first direction (along the main portion) and the second direction (perpendicular to the main portion), creating a two-dimensional sensing network. This dimensional expansion enables comprehensive input detection across the display surface without requiring complex multi-layer electrode structures.
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 improves input detection accuracy by minimizing interference and ensuring reliable sensing performance, even in flexible and foldable display devices.
Implementation Method 1
an input sensor disposed on the display panel and including a first electrode extending in a first direction and a second electrode extending in a second direction crossing the first direction
Data Source
AI summary
An input sensor including a first electrode and a second electrode, which cross each other. The first electrode includes a first main portion extending in a first direction and first sensing portions and second sensing portions, which are disposed with the first main portion therebetween in a second direction and each of which extends from the first main portion. Each of the first sensing portions and the second sensing portions includes first sub-portions extending in the first direction and first middle portions disposed between the first sub-portions and between one of the first sub-portions and the first main portion.