Touch-Enabled Display Panel with Selective AC/DC Electrode Drive
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Solution Overview
Problem
Display operation in touch detection panels is affected by touch detection operations, and existing technologies do not adequately address this issue.
Innovation Solution
A display panel with integrated touch detection functionality that uses DC and AC drive signals to minimize interference between display and touch detection operations, incorporating drive electrodes and a drive section that selectively applies these signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a common electrode is used for both display and touch detection functions, then device complexity is reduced, but display operation is affected by touch detection operation
Solution Approach 1:
The patent divides the drive electrode into multiple independent drive electrode blocks that can be selectively activated. During touch detection, only specific blocks are activated while others remain inactive, preventing interference with display operations in other regions. This segmentation allows the system to maintain low complexity while ensuring display reliability during touch detection.
2Measurement precision
If touch detection electrode intersects with drive electrode, then touch detection precision is improved, but interference between touch detection and display operation increases
Solution Approach 1:
The patent applies a DC drive signal to the drive electrode before touch detection begins. This preliminary action stabilizes the electrode potential and prevents potential differences from forming during subsequent AC-based touch detection, thereby eliminating interference while maintaining the intersecting electrode configuration for precise touch detection.
3Measurement precision
If AC drive signal is applied to drive electrode during touch detection, then touch detection sensitivity is improved, but display stability deteriorates
Solution Approach 1:
The patent applies different signal types to different regions of the drive electrode. DC drive signals are applied to regions where display stability is critical, while AC drive signals are applied only to specific blocks where touch detection is being performed. This local differentiation allows the system to maintain both display stability and touch detection sensitivity simultaneously.
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 selective application of DC and AC drive signals reduces the impact of touch detection on display operation, enhancing the responsiveness and accuracy of both functions.
Implementation Method 1
The drive section selectively applies a DC drive signal or an AC drive signal to the drive electrodes
Data Source
AI summary
A display panel with a touch detection function, in which display operation is less affected by touch detection operation, a method of driving the display panel with a touch detection function, a driving circuit, and an electronic unit having the display panel with a touch detection function are disclosed. The display panel with a touch detection function includes: one or more display elements; one or more drive electrodes; one or more touch detection electrodes; and a drive section selectively applying a DC drive signal or an AC drive signal to the drive electrodes.