Flexible Touch Panel Controller Adjusts Sensing Parameters
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Solution Overview
Problem
Flexible touch screen devices malfunction due to resistance changes caused by repeated folding or flexing, affecting touch detection accuracy and reliability.
Innovation Solution
A touch screen device with a controller that calculates a resistance change value based on the accumulative folding number of the touch panel, adjusting driving and sensing signal parameters such as voltage, frequency, and touch threshold values to compensate for resistance changes, using a look-up table to derive optimal sensing parameters and control signals for the touch driver and sensing driver.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the touch panel is folded repeatedly to achieve flexibility, then the adaptability of the display device is improved, but the resistance of the flexible electrodes increases causing malfunction
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the sensing parameter (voltage, frequency, or threshold value) based on the accumulative folding number. The controller modifies these parameters to compensate for the resistance changes in flexible electrodes caused by repeated folding, thereby maintaining touch detection accuracy while preserving device flexibility.
Solution Approach 2:
The patent implements feedback by using folding sensors to detect the folding state of the touch panel and providing this information to the controller. The controller then adjusts the sensing parameter based on the detected folding number, creating a closed-loop system that continuously compensates for resistance changes and maintains reliable touch detection.
2Measurement precision
If the sensing parameter is adjusted to compensate for resistance changes, then the touch detection accuracy is improved, but the device complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-establishing the relationship between the accumulative folding number and the sensing parameter adjustment. The controller is pre-programmed with the compensation algorithm that determines how to adjust voltage, frequency, or threshold values based on folding count, eliminating the need for complex real-time calculations and reducing overall system complexity.
3Measurement precision
If the voltage of the driving signal is increased to compensate for resistance changes, then the touch sensitivity is improved, but the energy consumption increases
Solution Approach 1:
The patent applies parameter changes by offering multiple compensation strategies including voltage adjustment, frequency adjustment, or threshold value modification. This allows the system to select the most energy-efficient parameter to adjust based on the specific folding condition, balancing touch sensitivity maintenance with energy consumption management.
Data Source
AI summary
A touch screen device includes a touch panel, a touch driver, a touch sensing driver, and a controller. The touch panel includes a plurality of driving lines extending in a first, direction and a plurality of sensing lines extending in a second direction. The touch driver outputs a driving signal to the driving lines. The touch sensing driver receives a sensing signal from the sensing lines. The controller determines a sensing parameter corresponding to an accumulative folding number of the touch panel and controls the touch driver and the touch sensing driver based on the sensing parameter.