Sinusoidal Signal Driving for Touch Display Panels
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Solution Overview
Problem
High-resolution touch display panels face issues with sub-pixels being under-charged due to time-divided output of touch and display signals, leading to inadequate charging time for sub-pixels.
Innovation Solution
A driving method for touch display panels that involves providing a sinusoidal signal to electrode blocks in the common electrode, ensuring an electric field is formed to rotate liquid crystal molecules, with the sinusoidal signal being a single-frequency signal that maintains average luminance values of sub-pixels, allowing for synchronized touch and display operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If touch signals and display signals are output in a time-dividing manner, then touch functionality is achieved, but sub-pixels receive insufficient charging time and become under-charged
Solution Approach 1:
The patent combines touch signal and display signal into a single integrated signal transmitted through the same data line. The touch signal is superimposed on the display signal, allowing both functions to operate simultaneously without time-division multiplexing. This merging eliminates the charging time conflict while maintaining both touch sensitivity and display quality.
Solution Approach 2:
The data line is designed to serve dual purposes: transmitting both display signals and touch signals simultaneously. By making the data line multi-functional, the system achieves both display and touch capabilities through a single transmission channel, resolving the time-division limitation without requiring separate dedicated lines for each function.
2Illumination intensity
If a single-frequency sinusoidal signal is provided to electrode blocks, then average luminance values of sub-pixels are maintained, but signal complexity increases
Solution Approach 1:
The patent employs a single-frequency sinusoidal signal with specific parameters (frequency, amplitude, phase) optimized for maintaining average luminance values. By carefully selecting and controlling these signal parameters, the system achieves stable display performance while using a relatively simple sinusoidal waveform rather than complex multi-component signals.
Solution Approach 2:
The use of a sinusoidal signal provides periodic voltage variations to the electrode blocks, creating regular electric field changes that maintain consistent liquid crystal molecule orientation and stable luminance output. The periodic nature of the signal ensures predictable and controllable display performance.
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 method ensures that sub-pixels receive adequate charging and maintain target luminance values, effectively addressing the under-charging issue and enabling simultaneous touch and display functionality in high-resolution panels.
Implementation Method 1
an electric field formed by the plurality of pixel electrodes and the common electrode driving liquid crystal molecules in the liquid crystal layer to rotate
Implementation Method 2
driving liquid crystal molecules in the liquid crystal layer to rotate
Implementation Method 3
each of the plurality of electrode blocks serves as a touch electrode to form a self-capacitance with a ground terminal
Data Source
AI summary
Disclosed are a driving method for a touch display panel, and a touch display apparatus. The driving method for a touch display panel includes: providing a sinusoidal signal y for each electrode block in a common electrode within a display period, wherein the display period includes N display stages, each display stage has M image frames, the refresh rate of the display period is greater than or equal to a refresh rate threshold value A, N≥2, M≤1, N is a positive integer, M is a positive number, and the refresh rate threshold value A is the maximum refresh rate that can be identified by human eyes; providing a data signal for multiple pixel electrodes; and an electric field, formed by the pixel electrodes and the common electrode, driving the inversion of liquid crystal molecules in a liquid crystal layer.