Touch Sensor Electrode Layout With Inverted Phases for EMI Reduction
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Solution Overview
Problem
Existing display devices experience electro-magnetic interference (EMI) that affects the performance and functionality of input sensors, particularly in multimedia electronic devices and vehicle displays.
Innovation Solution
A display device with an input sensor that includes a first sensing area divided into sub-areas with specific electrode configurations to receive transmission signals with inverted phases, reducing EMI by optimizing signal interference patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If phase-inverted transmission signals are applied to adjacent sub-areas, then electro-magnetic interference is reduced through destructive interference, but device complexity increases due to the need for additional sensing electrodes and signal control
Solution Approach 1:
The sensing area is divided into multiple sub-areas (first sub-area and second sub-area) with different sensing electrodes (first, second, third, and fourth sensing electrodes). Each sub-area receives transmission signals with different phases, allowing localized EMI cancellation while maintaining overall system functionality.
Solution Approach 2:
The phase parameter of transmission signals is changed between adjacent sub-areas. The first transmission signal and second transmission signal have inverted phases, which creates destructive interference for EMI reduction while maintaining the touch sensing capability in each sub-area.
2Reliability
If multiple sensing electrodes with phase-inverted signals are implemented, then operational performance is enhanced through EMI reduction, but manufacturing complexity increases
Solution Approach 1:
The sensing electrode system is segmented into four distinct electrodes arranged in two sub-areas. This segmentation allows independent optimization of each electrode's signal characteristics while simplifying the overall manufacturing process by dividing the complex multi-electrode system into manageable sections.
Solution Approach 2:
Adjacent sub-areas employ asymmetric signal configurations with phase-inverted transmission signals. This asymmetry in signal phase between the first and second sub-areas enables EMI cancellation while maintaining symmetric physical electrode arrangements that are easier to manufacture.
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 minimizes electro-magnetic interference, enhancing the accuracy and reliability of input sensing operations in display devices.
Implementation Method 1
The input sensor employs first and second sensing electrodes in the first sub-area, and third and fourth sensing electrodes in the second sub-area, which receive transmission signals with phase-inverted phases from a sensor controller to minimize EMI through destructive interference.
Data Source
AI summary
Provided is a display device comprising a display panel, an input sensor including a first sensing area having a first sub-area and a second sub-area, and a first sensor controller configured to drive the first sensing area. Here, the input sensor includes first sensing electrodes disposed in the first sub-area to receive a first transmission signal from the first sensor controller, second sensing electrodes disposed in the first sub-area and intersected with the first sensing electrodes, third sensing electrodes disposed in the second sub-area to receive a second transmission signal having a phase inverted from that of the first transmission signal from the first sensor controller, and fourth sensing electrodes disposed in the second sub-area and intersected with the third sensing electrodes.