Touch Panel Electrode Placement Reduces Electromagnetic Interference
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Solution Overview
Problem
In AMOLED display panels with integrated touch structures, electromagnetic interference occurs between the touch and display structures, affecting the display and touch control effects, and the On-Cell integration method requires numerous manufacturing processes and high production costs.
Innovation Solution
A touch panel design with a first and second substrate, where the touch electrodes are arranged between cathode blocks, and the cathodes are formed in a strip shape, reducing electromagnetic interference and manufacturing processes through an evaporation process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the touch structure is integrated in the AMOLED display panel in an On-Cell manner, then the touch control function is achieved, but electromagnetic interference occurs between the touch structure and display structure affecting display and touch control effects
Solution Approach 1:
The patent extracts the touch electrode structure from the traditional On-Cell integration and relocates it to a position between the cathode blocks and the common cathode layer. This separation removes the touch electrodes from the immediate vicinity of the organic light emitting blocks, thereby eliminating the electromagnetic interference while preserving the touch control function.
Solution Approach 2:
The patent changes the spatial arrangement by positioning touch electrodes in a previously unused layer space between the cathode blocks and common cathode. This dimensional repositioning allows the touch function to be maintained while avoiding the electromagnetic interference zone created by traditional integration methods.
2Adaptability or versatility
If the touch structure is integrated in the On-Cell manner, then the touch control function is achieved, but lots of manufacturing processes are required resulting in high production cost
Solution Approach 1:
The patent merges the touch electrode formation process with the existing cathode block formation process. By using the same evaporation process and equipment to create both the cathode blocks and the touch electrodes, the manufacturing complexity is reduced while still achieving the integrated touch control function.
Solution Approach 2:
The evaporation process used for forming cathode blocks is made multi-functional by also enabling the formation of touch electrodes. This universal approach allows a single manufacturing process to accomplish multiple functions, reducing the total number of steps and lowering production costs.
3Object-affected harmful factors
If the cathode is formed in a strip shape between cathode blocks, then electromagnetic interference is reduced, but the manufacturing process complexity changes
Solution Approach 1:
The patent replaces the traditional photolithographic method with an evaporation process for forming both cathode blocks and touch electrodes. This substitution simplifies the manufacturing process by using a single deposition technique instead of multiple complex steps including photoresist coating, exposure, development, and etching.
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 improves the display and touch control effects while reducing manufacturing processes and production costs by minimizing electromagnetic interference and using a more efficient evaporation process instead of photolithographic methods.
Implementation Method 1
the first touch layer and the cathode (or anode) may be formed by an evaporation process
Data Source
AI summary
Provided is a touch panel. The touch panel includes a first substrate and a second substrate disposed opposite to each other; a plurality of stacks separated by a pixel definition layer and each including an anode block and an organic light emitting block; a plurality of cathodes; a plurality of strip-shaped first touch electrodes arranged in a first direction and each extending in a second direction; and a plurality of strip-shaped second touch electrodes arranged in the second direction and each extending in the first direction. The first touch electrodes may arranged on the same layer with the anodes or arranged on the same layer with the cathodes, and are directly on the pixel definition layer. A projection of the strip-shaped first touch electrode is located between projections of two adjacent cathodes.