Touch Display Panel Auxiliary Circuit High Voltage Charging
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Solution Overview
Problem
Existing touch display panels have a limited drive voltage and slow charging speed of capacitors, resulting in a low report rate and an inability to meet high refresh frequency display and touch requirements.
Innovation Solution
A touch display panel with a non-display region containing a touch auxiliary circuit that provides a higher voltage signal in addition to the conventional touch drive signal to touch driver electrodes, allowing for faster capacitor charging and improved report rates at high refresh frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a conventional touch drive signal is provided to touch driver electrodes, then the drive voltage is limited and charging speed is slow, but the charging time is long and report rate is low
Solution Approach 1:
The touch auxiliary circuit pre-charges the touch driver electrodes to a high voltage level before the touch drive signal is applied. This preliminary charging action reduces the charging time required during the actual touch detection phase, thereby improving the report rate without compromising measurement precision.
Solution Approach 2:
The system dynamically adjusts the voltage signal provided to touch driver electrodes by combining a high-voltage signal from the touch auxiliary circuit with a touch drive signal from the touch driver circuit. This dynamic voltage adjustment enables faster capacitor charging while maintaining the ability to accurately detect touch positions through the touch sensing electrodes.
2Productivity
If the charging speed of capacitor is slow, then the charging time is long, but the report rate remains low
Solution Approach 1:
The touch auxiliary circuit performs preliminary charging of the capacitors formed by touch driver electrodes and touch sensing electrodes before touch detection begins. This advance charging action significantly reduces the charging time during the report phase, enabling higher report rates while maintaining accurate touch position detection.
3Speed
If a higher voltage signal is provided to touch driver electrodes, then the charging speed increases, but the device complexity increases
Solution Approach 1:
The voltage signal generation function is segmented into two independent circuits: a touch auxiliary circuit that generates high-voltage signals for fast charging, and a touch driver circuit that generates touch drive signals for accurate detection. This segmentation allows each circuit to be optimized for its specific function, achieving fast charging without unnecessarily complicating the overall system.
Solution Approach 2:
The touch auxiliary circuit acts as an intermediary that provides high-voltage signals to touch driver electrodes during specific phases. This intermediary component enables fast charging capability without requiring the main touch driver circuit to handle high voltages, thereby reducing the complexity of the primary detection system while still achieving the desired charging speed improvement.
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
The solution significantly reduces charging time and increases the report rate, enabling the touch display panel to meet the requirements for high refresh frequencies and improve touch and display performance.
Implementation Method 1
charge a capacitor formed by the touch driver electrode and the touch sensing electrode
Data Source
AI summary
Disclosed are touch display panel, method for driving touch display panel, and display device. The touch display panel includes display region including plurality of touch driver electrodes and plurality of touch sensing electrodes both arranged in array, and non-display region surrounding display region and including touch auxiliary circuit and touch driver circuit. When refresh frequency is first frequency, touch driver circuit configured to provide touch drive signal for each touch driver electrode in touch stage, and receive touch sensing signal returned by each touch sensing electrode to determine touch position according to touch sensing signal. When refresh frequency is the first frequency, touch auxiliary circuit configured to provide first voltage signal for each touch driver electrode in touch stage; and voltage of first voltage signal greater than voltage of touch drive signal. The present disclosure can increase report rate, and satisfy touch and display requirements for high refresh frequency.