OLED Touch Panel Cathode Interference Reduction
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Solution Overview
Problem
Capacitive sensing components in OLED touch panels are affected by the OLED cathode, leading to disturbed driving signals and increased power consumption due to higher contact resistance at bridge connections.
Innovation Solution
A mutual capacitive OLED touch panel is integrated, featuring a substrate with an OLED structure, encapsulating layer, first and second conductive layers, an insulating layer, and a sensing conductive layer, where the third conductive layer overlaps and is electrically connected to the first conductive layer, reducing interference from the OLED cathode and increasing mutual capacitance for improved touch accuracy and reducing resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If capacitive sensing components are directly formed on the OLED encapsulating layer using on-cell technology, then the touch panel structure is simplified, but the OLED cathode interferes with driving signals causing reduced touch precision
Solution Approach 1:
The patent divides the touch panel into two separate panels: an OLED display panel and a touch sensing panel. The OLED panel includes the cathode and encapsulating layer, while the touch panel includes the sensing electrodes and conductive layers. This segmentation physically isolates the sensing components from the OLED cathode, eliminating signal interference while maintaining structural simplicity through the integration of these two panels.
2Ease of operation
If a bridge connection is used to connect the first and second conductive layers, then the capacitive sensing function is achieved, but the small bridge area causes high contact resistance and increased power consumption
Solution Approach 1:
The patent transitions from a two-dimensional bridge connection to a three-dimensional overlapping structure. The first and second conductive layers are arranged in overlapping regions where they extend beyond each other's boundaries, creating larger contact areas. This dimensional change allows the conductive layers to overlap and connect over extended areas rather than through small bridge points, significantly reducing contact resistance and power consumption while maintaining the capacitive sensing function.
Data Source
AI summary
An OLED touch panel includes an OLED structure, a first conductive layer, a second conductive layer comprising first sensing electrodes, a sensing conductive layer, a third conductive layer comprising second driving electrodes and second sensing electrodes. The first driving electrodes are electrically connected to the plurality of second driving electrodes. The second sensing electrodes overlap the plurality of first sensing electrodes one-on-one.