In-cell OLED Touch Control via Shared Cathode Electrode
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current touch-control solutions for OLED panels, such as One Glass Solution (OGS) and On-cell, fail to achieve a lightweight and thin design, making it challenging to implement In-cell technology effectively.
Innovation Solution
A control device comprising a display driving circuit board, a touch-control driving circuit board, and a lighting circuit board, connected via a switching circuit board, which manages signal transmission and gating during display and touch-control periods to determine touch positions and enable efficient touch-control functionality on an electroluminescent OLED panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If OGS or On-cell touch-control solutions are used for OLED panels, then touch-control function is enabled, but the panel cannot achieve lightweight and thin design
Solution Approach 1:
The patent merges the touch-control electrode and display electrode into a single shared electrode structure. The cathode of the OLED pixel serves dual functions as both the display electrode and the touch-control sensing electrode, eliminating the need for separate touch-control layers and enabling In-cell implementation that achieves both touch functionality and thinness
2Ease of operation
If separate touch-control layers are integrated into OLED panel, then touch control is achieved, but the panel structure becomes complex and thicker
Solution Approach 1:
The cathode electrode is designed to serve multiple functions simultaneously: it acts as the display electrode for OLED light emission, the touch-control sensing electrode for detecting touch input, and the common electrode for both display and touch control circuits. This multi-functionality reduces structural complexity and achieves In-cell integration
3Weight of moving object
If In-cell technology is implemented on OLED panel, then lightweight and thin design is achieved, but complex signal transmission and gating management is required
Solution Approach 1:
The patent implements dynamic switching between display mode and touch-control mode through time-division multiplexing. The shared electrode alternates between receiving display signals and touch-control excitation signals, with the control device dynamically gating signals based on the current operational mode, enabling flexible adaptation between different functions
Solution Approach 2:
The system uses periodic time-division multiplexing where the shared electrode alternates between display periods and touch-control detection periods. During display periods, display signals are transmitted; during touch-control periods, excitation signals are applied and feedback signals are received, creating a rhythmic switching pattern that manages signal complexity
Data Source
AI summary
A control device for an electroluminescent touch-control display panel is described, in order to implement display and touch control on an In-cell electroluminescent touch-control display panel. The control device includes a display driving circuit board, a touch-control driving circuit board, a lighting circuit board and a switching circuit board. There is also described a touch screen including an electroluminescent touch-control display panel and the control device, and a display device including the touch screen.