In-Cell Display Electrode Layout for Integrated Touch Lines
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Solution Overview
Problem
In-cell type display devices face challenges in integrating touch sensing lines and source-drain electrodes on the same layer, which complicates manufacturing and increases thickness and cost.
Innovation Solution
A display device design with a pixel electrode and common electrode configuration, where the opening area in the row direction is longer than in the column direction, and touch sensing lines are integrated with data lines on the same layer, reducing the need for additional masks and simplifying the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If touch sensing lines and source-drain electrodes are integrated on the same layer, then manufacturing complexity is reduced and thickness is minimized, but manufacturing precision and reliability deteriorate due to integration challenges
Solution Approach 1:
The patent merges the touch sensing line and data line into the same conductive layer, eliminating the need for separate layers and masks. This integration reduces manufacturing complexity and device thickness while maintaining acceptable precision through optimized electrode geometry and positioning in the non-opening area.
Solution Approach 2:
The conductive line in the non-opening area serves dual functions: as a data line for pixel driving and as a touch sensing line for touch detection. This multi-functionality reduces the number of manufacturing steps and layers required, simplifying the overall device structure while maintaining both display and touch functionalities.
2Area of stationary object
If opening area is extended in row direction, then aperture ratio is improved, but manufacturing precision deteriorates due to asymmetric geometry
Solution Approach 1:
The patent employs asymmetric opening area geometry where the length in the row direction is deliberately made longer than in the column direction. This asymmetric design optimizes the aperture ratio for display performance while the corresponding asymmetric electrode configuration maintains manufacturing precision by aligning with the distorted pixel electrode geometry.
Solution Approach 2:
The electrode configuration is locally optimized to match the asymmetric opening area. The touch sensing line and common electrode are positioned and dimensioned specifically for the extended row direction geometry, ensuring that manufacturing precision is maintained in the critical display area while achieving improved aperture ratio.
3Manufacturing precision
If additional masks are used for separate touch sensing line formation, then manufacturing precision is improved, but productivity decreases and cost increases
Solution Approach 1:
The patent combines the formation of data lines and touch sensing lines into a single mask step. The conductive layer is patterned to create both line types simultaneously, eliminating the need for additional masks and processing steps. This approach maintains sufficient manufacturing precision through careful design of the pattern geometry while significantly improving productivity and reducing manufacturing cost.
Data Source
AI summary
Disclosed is a display device and a method of manufacturing the display device. The display device includes a pixel electrode disposed in an opening area; a common electrode having at least one region that overlaps the pixel electrode in the opening area; a gate line extending along a row direction in a non-opening area that surrounds the opening area; a data line extending along the non-opening area in a column direction that is perpendicular to the row direction; and a touch sensing line extending in the column direction across the opening area, wherein the opening area may have a shape in which a length of the opening area in the row direction is longer than a length of the opening area in the column direction.