Integrated Touch Display Compensating Capacitance Changes
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Solution Overview
Problem
Existing display devices with integrated touch screens suffer from touch errors due to screen switching, leading to unreliable touch sensing and limited touch sensitivity, as the capacitance changes caused by screen luminance changes are misinterpreted as user input, resulting in auto touch errors and manufacturing deviations.
Innovation Solution
A display device with an integrated touch screen and a method of driving it, which calculates average luminance of touch blocks and compensates for capacitive changes using a touch data compensator and touch IC to differentiate between actual user touches and screen switching-induced errors, thereby reducing touch errors and enhancing sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a touch screen is integrated with a display panel, then aesthetic design and slimming are achieved, but touch errors occur due to screen switching
Solution Approach 1:
The patent applies preliminary action by measuring and storing the initial capacitance values of touch blocks before screen switching occurs. This pre-measured baseline data is then used to compensate for capacitance changes during touch sensing, preventing touch errors caused by screen luminance transitions.
Solution Approach 2:
The patent utilizes parameter changes by monitoring capacitance variations in touch blocks and comparing them against stored initial capacitance values. The system dynamically adjusts touch sensing parameters based on detected capacitance changes, distinguishing between legitimate user touches and artifacts caused by screen switching.
2Measurement precision
If touch sensitivity is increased, then user input detection is improved, but touch errors due to screen switching are amplified
Solution Approach 1:
The patent implements feedback by continuously monitoring capacitance changes in touch blocks and comparing them against stored baseline values. When capacitance changes exceed predetermined thresholds, the system generates compensation signals that adjust the touch sensing reference levels, thereby maintaining high sensitivity while filtering out false touches caused by screen switching.
Solution Approach 2:
The system dynamically adjusts touch sensing parameters based on real-time capacitance measurements. By changing reference capacitance values and threshold levels according to detected screen switching events, the system maintains high touch sensitivity while eliminating false positive detections.
3Ease of operation
If capacitance changes are used for touch sensing, then touch detection is enabled, but screen switching induces false touch signals
Solution Approach 1:
The patent extracts the harmful capacitance changes caused by screen switching by separating them from legitimate touch signals. It does this by measuring initial capacitance values before screen transitions and using these as reference baselines to identify and compensate for spurious capacitance variations during touch sensing.
Solution Approach 2:
The patent converts the harmful effect of capacitance changes into a beneficial feature by using measured capacitance variations as compensation data. The system learns from screen switching-induced capacitance changes and uses this information to adjust touch sensing parameters, thereby transforming the source of errors into a tool for improving touch detection accuracy.
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 effectively reduces touch errors and enhances touch sensitivity by compensating for capacitive changes due to screen switching, improving the reliability of touch sensing and reducing manufacturing-related errors, thus increasing productivity and product competitiveness.
Implementation Method 1
A capacitance is changed in a corresponding touch block 12 which is touched by a user's finger during a touch sensing period (non-display period), and the touch IC 30 senses the capacitive change in each touch block 12
Implementation Method 2
the liquid crystal capacitance is changed by the switch of a screen, and thus, an initial capacitance is greatly changed
Data Source
AI summary
Provided are a display device with integrated touch screen and a method of driving the same that reduce a touch error due to the switch of an image and thus enhance touch sensing performance. The display device includes a display panel, a driver IC, and a touch IC. The driver IC respectively supplies a plurality of data voltages, corresponding to frame-unit image data, to a plurality of pixels formed in the display panel, and calculates average luminance of a plurality of touch blocks. Each of the touch blocks includes a certain number of pixels. The touch IC supplies a touch driving signal to each of the touch blocks, compensates for a capacitive change in the pixels due to switch of an image, and senses a touch.