Integrated Touch Screen Data Driver Synchronizes Signals
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Solution Overview
Problem
Conventional touch screen panels suffer from unsynchronized operation of touch controllers and image display controllers, leading to suboptimal touch sensing characteristics.
Innovation Solution
A touch screen panel design that integrates a pixel unit, a touch sensing unit with driving and sensing electrodes, a scan driver, a data driver, and a touch controller, where the timing of image data and driving signals is synchronized using a synchronizing signal, eliminating the need for an additional boosting circuit by generating driving signals directly from the data driver using gray level voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If touch controller and image display controller are independently driven, then device complexity is reduced, but touch sensing characteristic deteriorates
Solution Approach 1:
The patent merges the touch controller and image display controller into a single integrated controller that simultaneously manages both touch sensing operations and image display timing. This unified controller receives both image data and touch input data, synchronizes their processing timing, and outputs coordinated control signals to the respective display and touch sensing components, thereby improving touch sensing characteristics while maintaining reasonable device complexity.
2Reliability
If additional boosting circuit is added, then driving signal quality is improved, but device complexity increases
Solution Approach 1:
The patent extracts the boosting function from a separate external circuit and integrates it directly into the data driver circuitry. The data driver generates driving signals by selecting and outputting appropriate gray level voltages from multiple voltage sources based on image data values, thereby providing high-quality driving signals without requiring an additional external boosting circuit.
Solution Approach 2:
The data driver is designed to perform multiple functions: it generates data voltages for pixel control, generates driving signals for touch sensing operations, and provides the boosting function by selecting from multiple gray level voltage sources. This multi-functional design eliminates the need for separate dedicated circuits for each function.
Data Source
AI summary
A touch screen panel is disclosed. The touch screen panel includes a pixel unit, a touch sensing unit, and a data driver configured to provide data voltages to the pixel unit and to provide driving signals to the touch sensing unit.