Signal Controller Timing Synchronization for Display Touch Noise
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Solution Overview
Problem
Noise interference from display panel signals affects touch screen detection in display devices with touch screen panels, leading to tearing issues when the image signal recording rate mismatches the data writing rate.
Innovation Solution
A display device with a signal controller that generates a multiple control signal switching between high and low voltage levels to synchronize the timing of image signal recording and touch screen panel driving, minimizing noise and tearing by controlling the porch period and horizontal periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the touch screen panel is placed above the display panel surface, then touch detection functionality is achieved, but noise interference from display signals affects touch detection accuracy
Solution Approach 1:
The patent implements periodic switching between display operation mode and touch detection mode. During touch detection, the display panel stops updating and maintains a static state, while the touch controller periodically activates to detect touch events. This temporal separation ensures that noise from display signal updates does not interfere with touch detection accuracy.
2Adaptability or versatility
If the image signal recording rate does not match the data writing rate, then processing flexibility is maintained, but tearing occurs in the displayed image
Solution Approach 1:
The patent introduces a buffer memory that pre-stores image data before it is written to the display panel. The buffer acts as a preliminary storage stage, allowing the system to decouple the image signal recording rate from the data writing rate. When data is ready in the buffer, it is transferred to the display panel at the appropriate timing, preventing tearing while maintaining processing flexibility.
3Ease of operation
If the porch period timing is not properly controlled, then system operation simplicity is maintained, but both tearing and noise interference occur simultaneously
Solution Approach 1:
The patent introduces a control signal as an intermediary that coordinates between the display controller and touch controller. This control signal manages the porch period timing, ensuring that the display panel and touch screen operate in synchronized phases. The control signal acts as a mediator that resolves timing conflicts without requiring complex coordination logic in either controller, maintaining operational simplicity while ensuring reliable signal synchronization.
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
Effectively reduces noise interference and prevents tearing by precisely controlling the timing of signal application, ensuring accurate touch detection and image data writing.
Implementation Method 1
The capacitive touch screen panel senses the change in electrostatic capacity between an electrode and a conductive object such as a user's fingers
Data Source
AI summary
A display device with a signal controller is disclosed. The display device includes a display panel, a scan driver, a data driver, a touch screen including a touch controller, a graphics controller and a signal controller. The signal controller generates a multiple control signal for controlling the timing of recording of an image signal and the timing of driving of the touch screen panel. The signal controller transmits the multiple control signal to the graphics controller and the touch controller.