Touch Driving Circuit Frequency Optimization for Large Displays
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Solution Overview
Problem
Touch display devices require significant time to sense multiple touch electrodes due to the need for high accuracy, making it difficult to reduce sensing time without compromising sensitivity, especially in large-screen and high-resolution displays.
Innovation Solution
A touch display device with a touch driving circuit that supplies touch driving signals with varying frequencies and signal characteristics based on the time constants, signal delivery lengths, and positions of touch electrodes, allowing for efficient sensing without reducing sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If touch driving signals with uniform frequency are supplied to all touch electrodes, then the circuit design is simple, but the touch sensing time is excessive and productivity is reduced
Solution Approach 1:
The patent applies local quality by supplying touch driving signals with different frequencies to different touch electrodes based on their specific characteristics. Touch electrodes are divided into multiple groups, and each group receives driving signals with frequencies tailored to their time constants and signal delivery lengths, thereby optimizing sensing speed without requiring complete redesign of the entire driving circuit.
Solution Approach 2:
The patent implements dynamics by making the touch driving signal frequency variable rather than uniform. The driving frequency is dynamically adjusted according to the characteristics of each touch electrode group, allowing the system to adapt to different sensing requirements and reduce overall sensing time while maintaining manageable circuit complexity.
2Measurement precision
If touch sensing is performed with high accuracy requirements, then measurement precision is improved, but the time required for sensing increases
Solution Approach 1:
The patent applies parameter changes by modifying the frequency parameter of touch driving signals based on the characteristics of different touch electrodes. By adjusting the driving frequency to match the time constants and signal delivery lengths of specific electrode groups, the system achieves high measurement precision more efficiently, reducing the time required to complete accurate touch sensing across all electrodes.
3Adaptability or versatility
If uniform touch driving signals are used for all electrodes, then device complexity is reduced, but the adaptability to different electrode characteristics is poor
Solution Approach 1:
The patent implements local quality by tailoring touch driving signal characteristics to match the specific properties of different touch electrode groups. Each group receives signals with frequencies optimized for their time constants and signal delivery lengths, enhancing adaptability without requiring completely independent control circuits for each electrode, thus managing complexity effectively.
Solution Approach 2:
The patent applies segmentation by dividing touch electrodes into multiple groups based on their characteristics such as time constants and signal delivery lengths. This segmentation allows the system to apply different driving frequencies to different groups, improving adaptability while maintaining manageable circuit complexity through grouped rather than individualized control.
Data Source
AI summary
Disclosed are a touch display device, a touch driving circuit, and a touch driving method. A touch display device, a touch driving circuit, and a touch driving method is capable of supplying touch driving signals having different signal characteristics (e.g., driving frequencies) to touch electrodes or sensing groups by considering such touch electrode-specific or sensing group-specific difference. By this configuration, without reducing touch sensitivity, the touch sensing time required to sense all of the touch electrodes can be reduced, and a display driving time can be significantly lengthened, making it possible to implement a display requiring a large screen and high-resolution.