Layered Display Touch Sensor Electrodes for Signal Integrity
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Solution Overview
Problem
Existing display devices face challenges in optimizing the arrangement of metal lines and common electrodes to enhance display quality and touch sensitivity, particularly in liquid crystal display devices, where overlapping structures can lead to interference and reduced performance.
Innovation Solution
The implementation of a display device with first and second common electrodes, first and second metal lines, and spacers that overlap and extend between these electrodes, along with a touch sensor featuring first and second sensor electrodes and spacers, to improve signal integrity and touch sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal lines and common electrodes are arranged to overlap in liquid crystal display devices, then signal transmission is improved, but interference increases and touch sensitivity decreases
Solution Approach 1:
The patent introduces a third dimension (vertical stacking) to resolve the two-dimensional conflict between metal lines and common electrodes. By arranging sensor electrodes, signal lines, and common electrodes in different vertical layers, the patent achieves three-dimensional integration that eliminates planar interference while maintaining electrical connectivity and signal transmission efficiency.
Solution Approach 2:
The patent implements a nested structure where sensor electrodes are positioned between metal lines and common electrodes in the vertical direction. This nesting arrangement allows multiple functional layers to coexist in a compact configuration, with each layer performing its specific function without interfering with others, thus resolving the contradiction between signal transmission and interference reduction.
2Measurement precision
If sensor electrodes are added to improve touch sensitivity, then touch detection is enhanced, but device complexity increases
Solution Approach 1:
The patent makes the third common electrode serve dual functions: it acts as a common electrode for liquid crystal control and simultaneously functions as a sensor electrode for touch detection. This multi-functionality reduces device complexity by eliminating the need for separate sensor electrode structures, while still achieving enhanced touch sensitivity through the additional sensing layer.
Solution Approach 2:
The patent merges the functions of common electrodes and sensor electrodes by using the same conductive layer (third common electrode) for both liquid crystal control and touch sensing. This consolidation reduces the total number of components and simplifies the overall device structure while maintaining both display and touch functionality.
Data Source
AI summary
According to one embodiment, a display device includes a first common electrode, a second common electrode spaced apart from the first common electrode, a first signal line overlapping the first common electrode and the second common electrode, a first metal line overlapping the first signal line and the first common electrode, and a second metal line overlapping the first signal line and the second common electrode and spaced apart from the first metal line. The first metal line includes an extension portion extending between the first common electrode and the second common electrode.