Display Touch Sensor Layout With Spacer Through-Holes for Low Interference
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Solution Overview
Problem
Existing display devices face challenges in optimizing the design of common electrodes and signal lines to enhance display quality and touch sensitivity, particularly in liquid crystal display devices, where overlapping metal lines and spacers can interfere with signal integrity and touch responsiveness.
Innovation Solution
The display device incorporates a first and second common electrode configuration with overlapping first and second metal lines, each extending between the common electrodes, and a touch sensor with first and second sensor electrodes separated by spacers, allowing for improved signal transmission and touch detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal lines are arranged to overlap common electrodes for signal transmission, then signal transmission capability is improved, but interference between signal lines and common electrodes increases
Solution Approach 1:
A through-hole is introduced as an intermediary structure in the metal line to allow the spacer to pass through. This mediator enables the spacer to physically separate and insulate the metal line from the common electrode, reducing electromagnetic interference while maintaining signal transmission capability through the through-hole structure.
Solution Approach 2:
The metal line is segmented by introducing a through-hole that divides the continuous conductive path. This segmentation allows the spacer to be positioned within the through-hole, creating electrical isolation between the metal line and common electrode while preserving signal transmission functionality through the structured break.
2Object-affected harmful factors
If spacers are positioned inside through-holes of metal lines, then interference reduction is improved, but manufacturing precision requirements increase
Solution Approach 1:
The through-hole structure serves dual functions: it acts as both a signal transmission pathway and a positioning feature for the spacer. By merging these two functions into a single structural element, the design simplifies manufacturing while ensuring precise spacer positioning, as the through-hole geometry inherently defines the spacer location.
Solution Approach 2:
The through-hole structure provides self-aligning characteristics that automatically position the spacer correctly during assembly. The geometric fit between the through-hole and spacer creates inherent positioning accuracy without requiring additional complex alignment procedures or high-precision manufacturing tolerances.
3Ease of manufacture
If contact portions of pixel electrodes are arranged on the same straight line, then manufacturing simplicity is improved, but display quality and touch sensitivity decrease
Solution Approach 1:
The contact portions of pixel electrodes are deliberately arranged asymmetrically rather than on the same straight line. This asymmetric configuration optimizes the electric field distribution across the pixel electrodes, improving display quality and touch sensitivity by creating more effective capacitive coupling, while the manufacturing process remains simplified through standard lithography alignment procedures.
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.