Flexible OLED Touch Panel Dummy Lines for Signal Integrity
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Solution Overview
Problem
The oncell mutual-capacitive structure in flexible OLED displays experiences issues with parasitic capacitance and signal-to-noise ratio as panel size increases, leading to poor touch detection accuracy, and the visible touch control signal lines affect the screen image quality.
Innovation Solution
A display panel design featuring an encapsulation layer with pixel opening portions and spacing portions, incorporating a touch control structure with a first conductive film layer of touch control blocks, a second conductive film layer with touch control lines and dummy lines, and an insulating layer to connect the blocks to lines, where dummy lines are strategically placed to reduce visibility and improve signal integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the panel size is increased in flexible OLED displays, then the display area and coverage are improved, but parasitic capacitance increases and signal-to-noise ratio deteriorates, leading to poor touch detection accuracy
Solution Approach 1:
The touch control signal lines are segmented into multiple sections along their extension direction. Dummy signal lines are inserted between adjacent touch control signal lines to divide them into separate segments. This segmentation reduces the parasitic capacitance coupling between adjacent lines and improves signal-to-noise ratio, thereby maintaining touch detection accuracy in large-sized flexible OLED displays.
2Measurement precision
If touch control lines are made more visible to improve signal integrity, then signal-to-noise ratio improves, but screen image quality deteriorates
Solution Approach 1:
Dummy signal lines are introduced as intermediary elements between the touch control signal lines and the pixel electrodes. These dummy lines act as mediators that improve signal-to-noise ratio by reducing parasitic capacitance effects, while being positioned and designed to minimize their visual impact on the display image quality.
3Measurement precision
If dummy lines are added to reduce visibility of touch control lines, then signal integrity improves, but device complexity increases
Solution Approach 1:
The dummy signal lines are merged with the existing touch control signal line structure in the second conductive film layer. They are arranged in an interlaced pattern with the touch control lines, sharing the same layer and fabrication process. This merging approach improves signal integrity while minimizing the increase in device complexity by utilizing the existing structural framework.
Data Source
AI summary
A display panel and a display device are provided. The display panel comprises an encapsulation layer and a touch control structure on the encapsulation layer. The encapsulation layer comprises a plurality of pixel opening portions and spacing portions between the pixel opening portions. The touch control structure comprises a first conductive film layer, a second conductive film layer and an insulating layer between the first conductive film layer and the second conductive film layer, wherein the first conductive film layer comprises a plurality of touch control blocks, and the second conductive film layer comprises a plurality of touch control lines and a plurality of dummy lines. At least one dummy line is between adjacent touch control lines of at least some touch control lines. Each touch control block is electrically connected to one of the touch control lines via a conductive element arranged in the insulating layer.