Touch Detection Timing Adjustment for OLED Display Interference
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Solution Overview
Problem
The existing touch detection methods interfere with display operations in OLED panels, causing abnormal display lines due to electrical interference from touch sensors, which affect the voltage of the cathode and anode, leading to decreased display quality as the interference is fixed to specific positions and enhanced by human eyes through temporal integration.
Innovation Solution
A touch detection method and circuit that dynamically change the timing of touch pulse signals from frame to frame, ensuring they overlap with different display terms, thereby distributing the interference across various display lines, making it imperceptible to the human eye.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If touch detection operation is performed using fixed timing touch pulse signals, then touch detection function is achieved, but abnormal display lines appear due to electrical interference affecting cathode and anode voltages
Solution Approach 1:
The patent applies dynamics by changing the timing of touch pulse signals from fixed to variable. Specifically, the start timing of touch pulse signals is dynamically adjusted based on the frame number using a timing formula, causing the interference to occur at different positions in different frames rather than at a fixed position, thereby making the interference imperceptible to human eyes
Solution Approach 2:
The patent changes the timing parameter of touch pulse signals by introducing a variable component based on frame number. The timing formula includes a term that varies with frame number, causing the touch pulse timing to shift dynamically across frames, which distributes the electrical interference across different display lines over time
2Stability of the object's composition
If touch pulse signals are transmitted at fixed timings in each frame, then touch detection operation is stable, but the interference is concentrated at specific display lines and enhanced by human eyes through temporal integration
Solution Approach 1:
The patent introduces dynamic timing adjustment where the start timing of touch pulse signals varies with frame number. This dynamic change ensures that while touch detection remains stable and functional, the interference is distributed across different display lines in different frames, preventing concentration at specific lines and reducing visibility through temporal integration
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
This approach improves display quality by ensuring that the interference from touch detection operations is spread across different frames, reducing the visibility of abnormal display lines and enhancing overall display performance.
Implementation Method 1
the voltage variation of the touch sensor 200TS during the touch detection operation ripples/affects the voltage of a cathode 200C of the display panel 20 due to a parasitic capacitor 200PC1 between the touch sensor 200TS and the cathode 200C
Implementation Method 2
Since the voltage applied across the cathode 200C and the anode 200N determines the intensity of light emitted from an organic layer 200G of the display panel 20
Data Source
AI summary
A touch detection method for a touch and display driving circuit includes transmitting a first touch pulse signal of a first frame and transmitting a first touch pulse signal of a second frame. A start timing of the first touch pulse signal of the first frame with respect to the first frame is different from a start timing of the first touch pulse signal of the second frame with respect to the second frame.