In-cell Touch OLED Metal Mesh Electrode Bridge Layout
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Solution Overview
Problem
In touch organic light-emitting display devices, metal mesh electrodes connected via bridges can lead to parasitic capacitance, increasing the time constant and causing delays in touch-sensing signals and deteriorating touch sensitivity due to potential electrical disconnection and insulation layer overlap.
Innovation Solution
A touch organic light-emitting display device design where bridges do not overlap with second mesh electrodes, instead overlapping with connecting patterns, minimizing parasitic capacitance and ensuring stable electrical connections between mesh electrodes using a multiple-lattice structure and bank insulation film.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bridges are formed to connect mesh electrodes, then electrical connection reliability is improved, but parasitic capacitance increases causing time constant increase and touch-sensing delay
Solution Approach 1:
An insulation layer is introduced as an intermediary between the bridges and the second mesh electrodes. This insulation layer prevents direct contact between conductive elements, thereby eliminating parasitic capacitance formation while maintaining the electrical connection function of the bridges to the first mesh electrodes
Solution Approach 2:
The problem is solved by transitioning from a two-dimensional planar arrangement to a three-dimensional stacked structure. The bridges are positioned in a different layer (vertical dimension) from the second mesh electrodes, allowing electrical connection without spatial overlap that would cause parasitic capacitance
2Illumination intensity
If bridges are formed on the bank to prevent visibility, then aesthetic appearance is improved, but parasitic capacitance occurs between bridges and metal mesh electrodes
Solution Approach 1:
The insulation layer serves as a mediator that allows the bridges to be positioned on the bank (maintaining aesthetic appearance) while preventing harmful parasitic capacitance by electrically isolating the bridges from the second mesh electrodes
Solution Approach 2:
By placing bridges in a different layer from the second mesh electrodes, the solution maintains the aesthetic benefit of positioning bridges on the bank while eliminating parasitic capacitance through vertical separation in the third dimension
3Reliability
If multiple bridges are used to connect mesh electrodes, then connection reliability is improved, but parasitic capacitance and overall capacitance increase deteriorating touch sensitivity
Solution Approach 1:
The insulation layer acts as a universal mediator that enables multiple bridges to be used for enhanced connection reliability while preventing each bridge from generating parasitic capacitance with the second mesh electrodes, thereby preserving touch sensitivity
Data Source
AI summary
Disclosed is a touch organic light-emitting display device that is capable of stably connecting metal mesh electrodes to each other using a plurality of bridges and of minimizing the occurrence of parasitic capacitance. The display device includes an organic light-emitting array including pixel openings and a bank insulation film, and a touch electrode array bonded to the organic light-emitting array. The touch electrode array includes first and second mesh electrodes arranged in first and second directions and having a multiple-lattice structure, bridges for connecting first mesh electrodes to each other, and connecting patterns for connecting second mesh electrodes to each other. The bridges do not overlap the second mesh electrodes but overlap the connecting patterns so as to intersect the same. The first and second mesh electrodes, the bridges and the connecting patterns overlap the bank insulation film.