Display Electrode Time-Division Touch Detection
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Solution Overview
Problem
Existing touchscreen technologies face challenges in seamlessly integrating capacitance and electromagnetic induction methods for touch detection, as the configurations designed for capacitive touch detection are not suitable for electromagnetic induction, leading to inefficiencies in detection performance.
Innovation Solution
A display device configuration that includes a first substrate, a display functional layer, a plurality of first electrodes, a light guide plate, and a plurality of second electrodes, with a controller managing operations in a time-division manner to generate electromotive force during electromagnetic induction and electrostatic capacitance during capacitive touch detection, allowing for simultaneous effective detection using both methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If electrodes and driving configuration designed for capacitive touch detection are employed without modification in electromagnetic induction method, then device complexity is reduced, but electromagnetic induction touch detection cannot be satisfactorily performed
Solution Approach 1:
The patent applies dynamics by making the electrode configuration and driving method changeable according to the detection mode. The controller dynamically switches between capacitive driving (supplying voltage to electrodes) and electromagnetic induction driving (supplying current to generate magnetic fields), allowing the same physical electrodes to serve different functions based on operational requirements.
Solution Approach 2:
The patent changes the electrical parameters supplied to the electrodes depending on the detection method. For capacitive detection, voltage parameters are used to create electric fields; for electromagnetic induction detection, current parameters are used to generate magnetic fields. This parameter switching enables a single electrode structure to support multiple detection methodologies.
2Adaptability or versatility
If time-division manner is used to perform display operations and touch detection operations, then both display and touch detection functions are achieved, but detection response time is reduced
Solution Approach 1:
The patent implements periodic action by alternating between display periods and sensing periods in a structured time-division manner. During display periods, the electrodes perform their primary display function; during sensing periods, they perform touch detection. This periodic switching ensures both functions receive adequate operational time while maintaining system responsiveness.
Solution Approach 2:
The patent performs preliminary action by completing all display frame rendering before initiating the sensing period. This sequencing ensures that display operations are fully established before touch detection begins, preventing interference between the two functions while maintaining smooth operational transitions.
3Measurement precision
If electromagnetic induction method is implemented with coils for generating and detecting magnetic fields, then touch detection capability is enhanced, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent achieves universality by making the existing display electrodes serve dual purposes: they function as both display electrodes and electromagnetic induction detection electrodes. This eliminates the need for separate coil structures, allowing the same physical components to perform multiple functions and thereby reducing manufacturing complexity while maintaining detection sensitivity.
Solution Approach 2:
The patent uses the existing electrode pattern and structure from the display design as a template for the electromagnetic induction detection system. By reusing the established electrode layout, the patent avoids creating entirely new detection structures, thereby simplifying the manufacturing process while achieving the required magnetic field generation and detection capabilities.
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 configuration enhances touch detection sensitivity and accuracy by enabling the display device to detect proximity and contact using both mutual-capacitive and electromagnetic induction methods, improving overall touch input performance.
Implementation Method 1
An electromotive force caused by electromagnetic induction is generated in the second electrodes during the first sensing period
Implementation Method 2
The first electrodes are supplied with a second drive signal to generate electrostatic capacitance between the first electrodes and the second electrodes during the second sensing period
Data Source
AI summary
A display device includes: a first substrate; a display functional layer; a plurality of first electrodes; a light guide plate; a plurality of second electrodes; and a controller configured to control the first and second electrodes. The first substrate, the display functional layer, the first electrodes, the light guide plate, and the second electrodes are stacked in this order. The controller performs operations during a plurality of display periods to display an image, during a first sensing period, and during a second sensing period in a time-division manner. The first electrodes are supplied with a first drive signal and an electromotive force caused by electromagnetic induction is generated in the second electrodes during the first sensing period. The first electrodes are supplied with a second drive signal to generate electrostatic capacitance between the first electrodes and the second electrodes during the second sensing period.