Auxiliary Electrode Structure for Display Touch Sensitivity
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Solution Overview
Problem
Display devices face challenges in achieving reliable touch sensitivity and optical uniformity due to high electrical resistance and temperature unevenness, which affect luminance and color uniformity.
Innovation Solution
The implementation of an auxiliary electrode with a through hole under the light emitting functional layer, connected to a common electrode, reduces electrical resistance and parasitic capacitance, improving touch sensitivity and optical uniformity by receiving voltage from a power line in both the active and peripheral areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional electrode structure is used, then the device structure is simple, but the electrical resistance is high causing poor touch sensitivity and optical uniformity
Solution Approach 1:
The electrode structure is segmented into a main electrode and multiple auxiliary electrodes distributed across the display panel. Each auxiliary electrode is electrically connected to the main electrode through conductive patterns, creating a distributed electrode network that reduces overall electrical resistance and improves touch sensitivity without requiring a complete restructuring of the display device.
Solution Approach 2:
The auxiliary electrodes are positioned in the non-display area (peripheral region) and extend into the display area, utilizing the vertical and lateral dimensions to create multiple electrical connection paths. This dimensional approach allows voltage to be applied from multiple locations, reducing electrical resistance without increasing the footprint of the active display area.
2Reliability
If a conventional electrode structure is used, then the manufacturing process is simple, but temperature unevenness occurs leading to poor luminance and color uniformity
Solution Approach 1:
Auxiliary electrodes are strategically positioned in specific peripheral regions where they can most effectively distribute voltage and reduce temperature unevenness. The conductive patterns connecting auxiliary electrodes to the main electrode are designed with varying geometries to optimize local electrical distribution, ensuring uniform temperature and optical properties across different regions of the display panel.
Solution Approach 2:
The solution extends the electrode structure into the peripheral non-display area, utilizing the additional spatial dimension to create heat dissipation and voltage distribution pathways that do not interfere with the active display region. This allows temperature control and electrical uniformity to be achieved without adding components within the limited display area.
3Reliability
If the auxiliary electrode receives voltage only from one direction, then the connection is simple, but temperature unevenness and optical non-uniformity persist
Solution Approach 1:
The voltage supply system is segmented into multiple independent connection paths, with auxiliary electrodes receiving voltage from different directions through separate conductive patterns. This segmentation creates multiple parallel electrical pathways that distribute voltage more uniformly across the electrode structure, reducing temperature gradients and improving optical uniformity.
Solution Approach 2:
Voltage connections are established from multiple spatial directions (horizontal and vertical peripheral regions) rather than from a single direction. This multi-directional approach creates a three-dimensional voltage distribution network that effectively eliminates temperature unevenness and ensures uniform optical properties across the entire display panel.
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 enhances touch sensitivity and optical uniformity by reducing electrical resistance and temperature unevenness, leading to improved luminance and color consistency across the display area.
Implementation Method 1
an auxiliary electrode in the second opening and including a material different from the pixel electrode, a light emitting functional layer on the pixel electrode, the pixel definition layer, and the auxiliary electrode and provided with a through hole defined therethrough in an area overlapping the auxiliary electrode, and a common electrode on the light emitting functional layer and electrically connected to the auxiliary electrode via the through hole
Implementation Method 2
reduces electrical resistance and parasitic capacitance, improving touch sensitivity and optical uniformity
Data Source
AI summary
A display device includes a pixel electrode electrically connected to a circuit layer, a pixel definition layer defining a first opening which exposes the pixel electrode and a second opening spaced apart from the pixel electrode, an auxiliary electrode in the second opening and including a material different from the pixel electrode, a light emitting functional layer on the pixel electrode, the pixel definition layer and the auxiliary electrode and defining a through hole corresponding to the auxiliary electrode, and a common electrode on the light emitting functional layer and electrically connected to the auxiliary electrode at the through hole.