In-Cell Touch Display Signal Interference Mitigation
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Solution Overview
Problem
In-cell touch display apparatuses face challenges in stabilizing touch sensing and display driving functions without mutual interference, as they integrate signal lines into the display panel structure.
Innovation Solution
A touch display apparatus with a panel module, display driving circuit, control circuit, and touch sensing circuit, where common electrode lines are perpendicular to touch receiving lines, allowing for synchronized generation and transmission of driving synchronous pulses and touch transmission signals to avoid interference, using a display-driving method that integrates touch control and display functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If signal lines for touch control function are integrated into the display panel structure, then space and cost are reduced, but mutual interference between touch sensing and display driving functions occurs
Solution Approach 1:
The common electrode lines are divided into multiple groups (first group, second group, etc.) that are disposed at different positions. Different groups are selectively activated during different time periods to transmit touch sensing signals, while display driving signals are transmitted during other time periods. This temporal and spatial segmentation eliminates mutual interference between touch and display functions while maintaining the space-saving integrated structure.
Solution Approach 2:
The patent implements time-division multiplexing where common electrode lines are periodically switched between touch sensing mode and display driving mode. During first time periods, selected common electrode line groups transmit touch sensing signals; during second time periods, they transmit display driving signals. This periodic action allows both functions to share the same integrated structure without interference.
2Device complexity
If common electrode lines are used for both touch sensing and display driving, then device complexity is reduced, but signal interference between functions increases
Solution Approach 1:
The system dynamically switches the function of common electrode lines based on time periods. The control circuit selectively activates different groups of common electrode lines for touch sensing during first time periods and for display driving during second time periods. This dynamic time-division multiplexing reduces device complexity by sharing electrode lines while preventing signal interference through temporal separation.
3Adaptability or versatility
If touch transmission signals are transmitted through common electrode lines during display operation, then touch sensing function is integrated, but display quality may be affected
Solution Approach 1:
The patent employs periodic time-division multiplexing where common electrode lines alternate between transmitting touch sensing signals and display driving signals. During first time periods, touch sensing signals are transmitted through selected common electrode line groups; during second time periods, display driving signals are transmitted. This periodic action enables integrated functionality while protecting display quality by ensuring dedicated time periods for display operation.
Data Source
AI summary
A touch display apparatus is disclosed in the disclosure. The touch display apparatus includes a panel module, a display driving circuit and a touch sensing circuit. The panel module includes pixel units, common electrode lines and a touch receiving line. The common electrode lines are disposed vertical to the touch response lines. The display driving circuit is coupled to the panel module to drive the pixel units. The display driving circuit is synchronized to the touch sensing circuit. The touch transmission signal for touch-sensing is transmitted via the common electrode line sequentially. In addition, a display-driving method is also disclosed.