Display Panel Touch Structure Outside Thin-Film Encapsulation
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Solution Overview
Problem
The existing OLED panel touch structures with FMLOC design face issues of poor product yield and stability due to the need for low-temperature mask processes, leading to capacitance-related defects and increased production costs.
Innovation Solution
The display panel incorporates a touch structure with a flexible multi-layer on cell (FMLOC) design, where the touch electrodes are integrated outside the thin film encapsulation layer, reducing the need for low-temperature mask processes and improving manufacturing efficiency and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If low-temperature mask processes are used for FMLOC design touch structures, then touch functionality is achieved, but product yield and stability deteriorate due to capacitance-related defects
Solution Approach 1:
The patent extracts the touch electrode structure from the conventional FMLOC design and repositions it to be integrated outside the thin film encapsulation layer. This extraction eliminates the need for low-temperature mask processes that cause capacitance-related defects, thereby improving product yield and stability while maintaining touch functionality.
Solution Approach 2:
The patent transitions the touch electrode integration from an in-layer approach (within the encapsulation layer) to an out-layer approach (outside the encapsulation layer). This dimensional change in structural integration allows for higher processing temperatures and eliminates the capacitance defects associated with low-temperature processes.
2Adaptability or versatility
If low-temperature mask processes are used for FMLOC design touch structures, then touch functionality is achieved, but manufacturing costs increase
Solution Approach 1:
By extracting the touch electrode structure from the encapsulation layer integration approach, the patent eliminates the need for expensive low-temperature mask processes. This reduces manufacturing complexity and production costs while maintaining the desired touch functionality.
3Productivity
If touch electrodes are integrated outside the thin film encapsulation layer, then manufacturing stability is improved, but structural complexity increases
Solution Approach 1:
The patent segments the display structure into distinct functional layers, with the touch electrode structure positioned outside the thin film encapsulation layer. This segmentation allows for independent optimization of each layer's manufacturing process, improving overall manufacturing stability despite the increased structural complexity.
Data Source
AI summary
A display panel includes a display substrate and a touch structure disposed on the display substrate. The display substrate has a display area and a non-display area and includes a plurality of connection portions located in the non-display area. The touch structure includes a plurality of first touch channels, a plurality of second touch channels, a plurality of first trace lines and a plurality of second trace lines. A first touch channel includes first touch electrodes arranged in a first direction, and a second touch channel includes second touch electrodes arranged in a second direction; the first direction is perpendicular to the second direction. The plurality of first touch electrodes in the first touch channel are connected through a first trace line; the plurality of second touch electrodes in the second touch channel are connected to a same connection portion through respective second trace lines.