Touch Driving Circuit Parameter Variation Compensation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing touch driving circuits in liquid crystal display panels suffer from errors due to non-uniform parameters of elements, leading to inconsistent touch signal amplification and output, which affects the reliability of touch screen panels.
Innovation Solution
A touch driving circuit comprising a photoelectricity generation unit, amplification unit, amplification control unit, and output control unit, where the amplification control unit adjusts the level at the connection point between the amplification unit and output control unit to isolate the current output from the on-state voltage of the amplification unit, ensuring consistent current reading regardless of element parameter variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If LTPS technique is used to manufacture the circuit, then the touch driving circuit can be integrated in the liquid crystal cell, but the elements have non-uniform parameters causing non-uniform level gains for amplification transistors
Solution Approach 1:
The patent changes the operating parameters of the amplification transistor by adjusting the initial signal level input to compensate for parameter variations. By dynamically adjusting the initial signal level based on the specific transistor's characteristics, the system achieves uniform output despite manufacturing variations in transistor parameters.
Solution Approach 2:
The patent implements a feedback mechanism where the output signal is monitored and used to adjust the initial signal level for subsequent operations. This feedback loop compensates for non-uniform transistor parameters by automatically adapting the input conditions to achieve consistent amplification across all pixels.
2Ease of manufacture
If amplification transistors with different parameters are used, then circuit integration is achieved, but touch signals are amplified differently causing reading errors
Solution Approach 1:
The patent adjusts the initial signal level parameter to compensate for variations in transistor amplification characteristics. By changing the initial signal level dynamically, the system ensures that transistors with different parameters produce uniform output signals, thereby eliminating reading errors while maintaining circuit integration.
Solution Approach 2:
The patent performs preliminary adjustment of the initial signal level before the actual touch signal amplification. This preliminary action compensates for expected parameter variations, ensuring that all amplification transistors operate with uniform gain characteristics from the start, thus preventing reading errors before they occur.
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 solution prevents errors in touch signal reading by ensuring that the current output is independent of amplification unit voltage, thereby improving the reliability of touch screen panels by accurately determining touch events.
Implementation Method 1
the sensor senses light using a photodiode D1 and generates a leakage current so as to detect a touch signal
Data Source
AI summary
The present disclosure provides a touch driving circuit, a liquid crystal panel and its driving method, so as to prevent the occurrence of an error due to non-uniform parameters of elements in the touch driving circuit, thereby to improve the reliability of a touch screen panel. The touch driving circuit includes a photoelectricity generation unit, an amplification unit, an output control unit and an amplification control unit.