In-cell OLED Touch Panel Narrow Border Design
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Solution Overview
Problem
Existing touch display panels with projected capacitive touch technology have wide borders due to the need for numerous wires for connection, which is not suitable for the trend of narrow border designs and compromises touch detection sensitivity.
Innovation Solution
An in-cell OLED touch display panel structure with a TFT substrate, OLED layer, common electrode layer, encapsulation layer, first electrode layer, and second electrode layer, where the first and second electrode layers are disposed on one side of the common electrode layer opposite to the OLED layer, and include mesh electrodes with isolation electrodes to enhance touch detection sensitivity and reduce border width.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If sensing conductor lines are arranged in both X-direction and Y-direction with connection to flexible circuit board, then touch sensing function is achieved, but border width increases
Solution Approach 1:
The electrode structure is segmented into first electrodes arranged in X-direction and second electrodes arranged in Y-direction, with isolation electrodes separating them. This segmentation allows independent arrangement of sensing lines without requiring extensive border connections, thus reducing border width while maintaining touch sensing function.
Solution Approach 2:
The first and second electrode layers are merged into a single touch display panel structure with the OLED layer, forming an in-cell OLED touch panel. This integration eliminates the need for separate connection structures, reducing border width while achieving both display and touch sensing functions.
2Adaptability or versatility
If traditional projected capacitive touch technique is used, then multi-touch capability is achieved, but material cost and manufacturing cost increase
Solution Approach 1:
The touch electrode structure is merged with the OLED display structure, forming an in-cell OLED touch panel where the first and second electrodes serve both display and touch sensing functions. This integration reduces material costs by eliminating separate touch panel materials and simplifies manufacturing processes.
Solution Approach 2:
The electrode layers serve dual functions: displaying images through the OLED structure and detecting touch inputs through capacitive sensing. This multi-functionality achieves multi-touch capability while reducing material and manufacturing costs compared to traditional separate touch panel solutions.
3Measurement precision
If sensing conductor lines are densely arranged for high touch detection accuracy, then touch detection sensitivity improves, but border width increases
Solution Approach 1:
The electrode structure is segmented into first electrodes in X-direction and second electrodes in Y-direction with isolation electrodes. This segmentation allows dense arrangement of sensing lines within the display area without requiring additional border space for connections, achieving high touch detection accuracy with narrow borders.
Solution Approach 2:
The electrode arrangement utilizes both X and Y dimensions independently with first and second electrodes oriented in different directions. This two-dimensional arrangement maximizes touch detection coverage within the display area without increasing border width, improving touch detection accuracy while maintaining narrow borders.
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
The in-cell OLED touch display panel achieves high touch detection accuracy, reduces material and manufacturing costs, and is more suitable for narrow border designs while maintaining better light penetration rates compared to prior art.
Implementation Method 1
The first electrode layer includes a plurality of first electrodes arranged along a first direction, a plurality of isolation electrodes, and a plurality of second electrode connection lines. The second electrode layer includes a plurality of second electrodes arranged along a second direction.
Data Source
AI summary
An in-cell OLED touch display panel structure includes a first electrode layer and a second electrode layer. The first electrode layer includes a plurality of first electrodes arranged along a first direction, a plurality of isolation electrodes, and a plurality of second electrode connection lines. The second electrode layer includes a plurality of second electrodes arranged along a second direction. Each of the second electrodes extends to one edge of the in-cell OLED touch display panel structure through a corresponding second electrode connection line. The first electrode layer and the second electrode layer are both disposed at one side of a common electrode layer opposite to an OLED layer.