Touch Control Driving Signal Constant Value During Pixel Update
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Solution Overview
Problem
The proximity of touch control electrodes to display cathodes in AMOLED screens causes interference patterns on the display due to coupled touch control driving signals, negatively impacting user experience.
Innovation Solution
A method to generate touch control driving signals that consider the pixel update interval of the display screen, ensuring that part of the signal within this interval remains constant, thereby avoiding interference by adjusting flipping times or phases of the signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If touch control electrodes are placed close to display cathodes in AMOLED screens, then touch control sensitivity is improved, but display screen interference increases due to coupled driving signals
Solution Approach 1:
The patent applies preliminary action by pre-defining constant value periods for touch control driving signals that coincide with pixel update intervals. Before generating interference, the system prepares the signal waveform to maintain constant values during critical display update periods, thereby preventing ripple interference patterns from forming on the display screen while preserving touch sensitivity.
2Speed
If touch control driving signal flips frequently, then touch control response speed is improved, but display screen interference increases due to signal coupling
Solution Approach 1:
The patent applies local quality by making different portions of the touch control driving signal have different characteristics. Specifically, during pixel update intervals, the signal maintains constant values to prevent display interference, while during other periods outside these intervals, the signal can flip more frequently to maintain touch control responsiveness. This spatial-temporal differentiation resolves the contradiction between speed and interference.
3Power
If touch control driving signal amplitude is increased, then touch control signal strength is improved, but coupling to display cathode increases causing more interference
Solution Approach 1:
The patent applies periodic action by introducing a periodic pattern where touch control driving signals alternate between constant value periods (during pixel updates) and active flipping periods (during frame intervals). This periodic structure allows the system to maintain sufficient signal strength during active periods for touch detection while ensuring display stability during constant value periods, thereby reducing crosstalk coupling effects.
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 effectively reduces the influence of touch control driving signals on the display screen, preventing interference patterns and enhancing user experience by maintaining signal stability during pixel updates.
Implementation Method 1
a signal amplitude of which a touch control driving signal is coupled to the display cathode also gets greater, and the signal is coupled to a driving data line of the display screen through the display cathode of the display screen to form a crosstalk coupling path
Data Source
AI summary
A method for transmitting a touch control driving signal, a touch control chip and an electronic device are provided, which could effectively reduce the influence of the touch control driving signal in a touch control screen on a display screen. The method includes: acquiring a pixel update interval of a pixel circuit in a display screen, the pixel update interval being a time interval during which the pixel circuit receives a data driving signal; and generating a touch control driving signal of a touch control screen according to the pixel update interval, part of the touch control driving signal that is located within the pixel update interval being a constant value.