OLED Touch Panel Composite Electrode Sheet Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing organic light emitting diode (OLED) displays with touch screen functions face challenges in achieving low sheet resistance while maintaining excellent touch performance, as thick electrodes required for low resistance deteriorate light transmittance.
Innovation Solution
The solution involves an OLED display design with a touch screen panel featuring electrode patterns and wires made of silver (Ag) and indium tin oxide (ITO), where the electrode patterns and wires are formed on the same plane, including a transparent oxide layer and a metallic layer, with a connection electrode to reduce sheet resistance and improve touch performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the thickness of the electrode is increased to reduce sheet resistance, then low contact resistance and excellent touch performance are achieved, but light transmittance is deteriorated
Solution Approach 1:
The patent employs a composite electrode structure consisting of a transparent conductive oxide layer (such as ITO) and a reflective metallic layer (such as silver). This composite configuration allows the electrode to simultaneously achieve low sheet resistance through the metallic layer while maintaining high light transmittance through the transparent oxide layer, thereby resolving the contradiction between touch performance and light transmittance without requiring increased electrode thickness
Solution Approach 2:
The patent optimizes the thickness parameters of both the transparent oxide layer and the metallic layer to achieve the desired balance. By carefully controlling the thickness of each layer, the electrode achieves sufficient electrical conductivity for excellent touch performance while the transparent oxide layer maintains adequate light transmittance, avoiding the need to increase overall electrode thickness
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 design enables the manufacture of OLED displays with excellent touch screen functionality and reduced sheet resistance through a simplified process, enhancing both touch performance and light transmittance.
Implementation Method 1
transmittance of light is deteriorated because of the thickened electrode
Implementation Method 2
A capacitive touch screen panel detects an input position by measuring a change of capacitance between electrodes of touched positions on the panel
Data Source
AI summary
An organic light emitting diode display includes: an organic light emitting display panel including a first substrate including an organic light emitting element and a second substrate combined with the first substrate; a touch substrate combined with the organic light emitting display panel; a first electrode pattern having a plurality of pads, formed on the touch substrate, and connected by an access unit in a first direction; a second electrode pattern having a plurality of pads; a wire electrically connected to one of the first electrode pattern and the second electrode pattern; an insulation layer formed on the first and second electrode patterns and including a contact hole; and a connection electrode disposed in the contact hole and electrically connecting pads of the second electrode pattern in a second direction crossing the first direction, wherein the first electrode pattern, the second electrode pattern, and the wire are formed simultaneously on the same plane.