Touch Display Charging Electrode Layout for Low-Interference Input Sensing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing touch-based input systems in multimedia electronic devices face interference issues between data lines and charging electrodes, which affect the accuracy and reliability of input sensing.
Innovation Solution
An electronic device design that includes a base layer, a light-emitting element, an input sensor, a data line, and a charging electrode, where the charging electrode generates an induced magnetic field using phase-delayed driving signals to minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a touch-based input system with charging electrode is implemented, then wireless charging functionality is added, but interference occurs between data line and charging electrode
Solution Approach 1:
An offset electrode is introduced as an intermediary element between the charging electrode and the data line. The offset electrode receives an offset signal that is phase-shifted relative to the charging signal, creating a magnetic field that opposes and cancels the electromagnetic interference generated by the charging electrode, thereby protecting the data line from interference
Solution Approach 2:
The phase parameter of the electrical signal is changed to solve the interference problem. By applying a phase-shifted signal to the offset electrode, the magnetic field orientation and timing are altered to create destructive interference with the harmful electromagnetic field, converting the phase parameter to eliminate interference
2Adaptability or versatility
If charging electrode generates magnetic field for wireless charging, then charging functionality is enabled, but interference affects input sensing accuracy
Solution Approach 1:
The offset electrode serves as a mediator that generates a counteracting magnetic field to protect the sensor layer. By positioning the offset electrode and applying phase-shifted signals, it creates an electromagnetic shield that prevents the charging electrode's magnetic field from interfering with the capacitive touch sensing, thereby maintaining measurement precision while enabling wireless charging
Solution Approach 2:
The offset electrode performs preliminary anti-action by pre-generating a magnetic field that opposes the interference before it affects the sensing operation. The phase-shifted signal is applied in advance to create a protective electromagnetic environment, preventing interference from degrading the input sensing 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 design reduces interference between data lines and charging electrodes, enhancing the accuracy and reliability of input sensing, particularly for inputs made with pens or other magnetic field-generating devices.
Implementation Method 1
The charging electrode generates an induced magnetic field when the (1-1)-th line portion receives the first driving signal and the (1-2)-th line portion receives the second driving signal whose phase is delayed from the first driving signal
Data Source
AI summary
An electronic device includes a base layer, a light emitting element, an input sensor, a data line and a charging electrode. The charging electrode is disposed below the light-emitting element and includes a plurality of first line portions, each of which crosses the data line in a plan view. The charging electrode generates an induced magnetic field when a first one of the plurality of first line portions receives a first driving signal and a second one of the plurality of line portions receives a second driving signal whose is phase is delayed from the first driving signal.