Scanning Circuit Gating Module for Touch Display Interference
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Solution Overview
Problem
Existing touch display devices suffer from interference between display and touch stages due to non-suspended scanning circuits, leading to poor display effects during the touch stage.
Innovation Solution
Incorporating a gating module in the scanning circuit to control display scanning on pixel rows, suspending scanning during the touch stage while allowing it during the display stage, ensuring independent operation of both stages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the scanning circuit operates continuously to scan pixel rows for display, then display scanning can be performed without interruption, but the display stage will be interfered with during the touch stage
Solution Approach 1:
The scanning circuit is designed to dynamically change its operating state based on the current stage. During the display stage, the scanning circuit is enabled to scan pixel rows. During the touch stage, the scanning circuit is suspended to avoid interference. This dynamic switching resolves the contradiction by making the scanning circuit adaptive to different operational requirements.
Solution Approach 2:
A control module is introduced as an intermediary between the touch controller and the scanning circuit. The control module receives stage information from the touch controller and generates corresponding control signals to enable or suspend the scanning circuit. This intermediary mechanism allows independent operation of display and touch stages, preventing mutual interference.
2Reliability
If the scanning circuit is suspended during the touch stage to prevent interference, then normal display can be ensured, but display scanning cannot be performed continuously
Solution Approach 1:
The scanning circuit operates in a periodic manner, alternating between active scanning during the display stage and suspended state during the touch stage. This periodic operation ensures that display scanning is performed when needed while allowing the touch stage to operate independently without interference, thus maintaining both reliability and continuous operational capability.
Solution Approach 2:
The scanning circuit transitions between different operational states (enabled and suspended) based on the current stage requirements. This dynamic state change allows the system to prioritize display normal operation during touch interactions while maintaining the capability to perform continuous scanning during the display stage.
3Adaptability or versatility
If the display stage and touch stage are operated independently, then each stage can function without interfering with the other, but the scanning circuit control becomes more complex
Solution Approach 1:
A control module serves as an intermediary that manages the independent operation of display and touch stages. This module receives stage information from the touch controller and generates appropriate control signals for the scanning circuit. By centralizing the control logic in a dedicated module, the system achieves independent stage operation while keeping the control complexity localized and manageable.
Solution Approach 2:
The control module is designed to handle multiple functions: receiving stage information from the touch controller, determining the current stage, and generating corresponding control signals for the scanning circuit. This multi-functional approach reduces the need for separate control mechanisms for each stage, thereby managing complexity while enabling independent operation.
Data Source
AI summary
A scanning circuit, a drive circuit and a touch display device are provided. The scanning circuit drives a pixel row in a one-to-one manner. The scanning circuit includes: an input module, configured to generate a scanning signal in response to an inputted starting signal; a latch module, electrically connected to the input module and configured to generate the starting signal in response to the scanning signal and latch the starting signal; and a gating module, electrically connected to the latch module and configured to perform a display scanning on the pixel row driven by the scanning circuit under a control of the starting signal in a display stage and suspend the display scanning on the pixel row driven by the scanning circuit under the control of the starting signal in a touch stage.