OLED Touch Shielding via Light-Emitting Control Electrode
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Solution Overview
Problem
The touch units in OLED panels with touch-in-cell structures face interference from signal signals from the thin film transistor array and anode layer, affecting touch precision.
Innovation Solution
A drive method and circuit for OLED panels that include a light-emitting layer with a first light-emitting control electrode layer and a touch electrode layer, where the first light-emitting control electrode layer is insulated from the touch electrode layer and controlled to receive a shielding voltage during touch stages, reducing signal interference by maintaining the voltage at 0V, thereby improving touch precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the touch structure is integrated into the OLED panel (touch-in-cell structure), then the overall device integration is improved, but signal interference from the thin film transistor array and anode layer increases, affecting touch precision
Solution Approach 1:
A first light-emitting control electrode layer is introduced as an intermediary between the anode layer and the touch electrode layer. This intermediate layer serves as a shielding structure that blocks signal interference from the lower layers, allowing the touch-in-cell structure to maintain both integration and touch precision
Solution Approach 2:
The OLED panel structure is segmented into multiple functional layers: anode layer, first light-emitting control electrode layer (with first light-emitting control holes), light-emitting layer, and touch electrode layer. This segmentation allows each layer to perform its specific function independently, with the first light-emitting control electrode layer specifically dedicated to shielding against signal interference
2Measurement precision
If the first light-emitting control electrode layer is controlled to receive a shielding voltage during touch stages, then signal interference is reduced and touch precision is improved, but the device complexity increases due to additional voltage control requirements
Solution Approach 1:
The first light-emitting control electrode layer is designed to serve multiple functions: it controls light emission during display stages and provides signal shielding during touch stages. By reusing this existing structure for dual purposes, the patent avoids adding separate shielding electrodes, thereby reducing overall device complexity while still achieving improved touch precision
Solution Approach 2:
The first light-emitting control electrode layer alternates between receiving a first voltage (for light emission control) during display stages and a second voltage (for signal shielding) during touch stages. This periodic switching of voltage modes allows the same structure to adapt to different operational requirements without permanent structural modifications
Data Source
AI summary
Provided are a drive method and drive circuit for an organic light-emitting diode panel and a display device. The method is applied to an organic light-emitting diode panel, which includes a light-emitting layer, and a first light-emitting control electrode layer and a touch electrode layer sequentially on the light-emitting layer. The first light-emitting control electrode layer and the touch electrode layer are insulated from each other. The method includes: outputting a display voltage to the first light-emitting control electrode layer at a display stage and outputting a shielding voltage to the first light-emitting control electrode layer at a touch stage.