Display Drive Electrodes as Touch Detection Coils
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Solution Overview
Problem
The existing touch detection systems for display devices, particularly those using electromagnetic induction, require a sensor plate which increases manufacturing costs and complexity.
Innovation Solution
A display device with a pixel array, scan lines, signal lines, and drive electrodes that alternately execute display and touch detection operations, using the drive electrodes to form coils for generating and detecting magnetic fields without the need for a separate sensor plate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a sensor plate is added to enable electromagnetic induction-based touch detection, then touch detection accuracy is improved, but manufacturing cost increases
Solution Approach 1:
The patent merges the touch detection coil with the display device's existing electrode structure. The electrode that normally serves as a common electrode for liquid crystal display is repurposed to function as a coil for electromagnetic induction-based touch detection, eliminating the need for a separate sensor plate while maintaining detection accuracy
Solution Approach 2:
The electrode in the display device is given dual functionality: it serves both as a common electrode for display operation and as a coil for touch detection. This multi-functionality approach eliminates the need for additional dedicated touch detection components, thereby reducing manufacturing cost
2Adaptability or versatility
If a sensor plate is added to enable electromagnetic induction-based touch detection, then touch detection function is improved, but device complexity increases
Solution Approach 1:
The patent combines the touch detection coil structure with the existing display electrode, merging two functions into one component. This integration reduces the number of separate parts and simplifies the overall device structure while enabling electromagnetic induction-based touch detection
Solution Approach 2:
The electrode performs multiple functions: display operation and touch detection. By making the electrode universal, the patent avoids adding dedicated touch detection components, thereby reducing device complexity while maintaining full touch detection functionality
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 approach allows for effective touch detection without the need for a separate sensor plate, reducing manufacturing costs and simplifying the design while maintaining accurate detection of touch and proximity events.
Implementation Method 1
a coil that generates a magnetic field is formed using the plurality of drive electrodes at a time of detecting an external proximity object
Data Source
AI summary
To provide a display device with a touch detection function capable of suppressing an increase of price.The display device includes a pixel array that has a plurality of pixels disposed in a matrix form, a plurality of scan lines that are disposed in each row of the pixel array and supply a scan signal to the plurality of pixels disposed in each corresponding row, a plurality of signal lines that are disposed in each column of the pixel array and supply an image signal to the plurality of pixels disposed in each corresponding column, and a plurality of drive electrodes that are disposed in the pixel array and supply a drive signal to the plurality of pixels at a time of displaying an image. A coil that generates a magnetic field is formed using the plurality of drive electrodes at a time of detecting an external proximity object.