Liquid Crystal Touch Screen In-Plane Interference Control
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Solution Overview
Problem
Large size capacitive touch screens using liquid crystal displays experience significant ripple interference due to data lines, leading to explosion point failures and touch failures, particularly when driving manners like Dot V Strip or V Strip by Sub-pixel are used.
Innovation Solution
A method and device utilizing a timing controller to detect image characteristics, match them to a predetermined parameter table, and invert data voltages on data lines to ensure opposite polarity changes relative to a common electrode, thereby canceling out ripple interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional driving manners (Dot V Strip, V Strip by Sub-pixel) are used to drive large size capacitive touch screens, then display coverage and resolution are improved, but ripple interference increases causing explosion point failures and touch failures
Solution Approach 1:
The patent inverts the polarity of data voltages on specific data lines to reverse the direction of coupled voltages. By applying opposite polarity inversion to adjacent data lines, the ripple interference patterns are reversed and cancel each other out, transforming the harmful interference into a neutral state while maintaining the original high-resolution display performance
Solution Approach 2:
The patent dynamically changes the polarity parameter of data voltages based on detected image characteristics. When ripple interference is detected, the system adjusts the voltage polarity parameter to invert the coupled voltage directions, thereby changing the electrical characteristics to eliminate interference while preserving display quality
2Area of stationary object
If data line loads are increased to support large size capacitive touch screens, then display area is improved, but ripple interference magnitude increases leading to more frequent explosion point errors
Solution Approach 1:
The patent converts the harmful ripple interference caused by increased data line loads into a beneficial effect by inverting the polarity of coupled voltages. The same electrical signals that cause interference are reconfigured to produce opposite voltage changes that cancel each other out, transforming the interference problem into a solution that maintains large display area while eliminating ripple 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
Significantly reduces rippling and prevents explosion point failures in touch screens by ensuring opposite voltage changes between adjacent data lines, allowing normal operation even during images that previously caused interference.
Implementation Method 1
inverting original polarities of data voltages input to at least a portion of data lines of the display panel based on the adjustment parameters, so that change directions of coupled voltages of adjacent two of the data lines with respect to a common electrode are opposite to each other
Data Source
AI summary
A method and device for controlling in-plane interference of a liquid crystal touch screen and a display system are provided. By detecting a current image of a display panel of the liquid crystal touch screen in real time, and when the image that causes the in-plane interference of the liquid crystal touch screen is detected, inverting original polarities of data voltages input to at least a portion of data lines of the display panel, so that change directions of coupled voltages of adjacent two of the data lines with respect to a common electrode are opposite to each other, solving problems of in-plane interference for the liquid crystal touch screen.