Display Device Touch Detection Wiring Time Division
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Solution Overview
Problem
Existing display devices with touch detection functions face challenges in reducing the frame area while maintaining fast touch drive and display quality, as the wiring requirements for touch detection and display drive signals conflict, leading to increased wiring width and hindered frame reduction.
Innovation Solution
The display device employs a time division manner for touch detection and display operations, using separate wirings for touch detection drive signals and display drive voltages, where the touch detection drive signal is supplied through one wiring during touch detection periods and the display drive voltage is supplied through another wiring during display periods, allowing for reduced wiring width and frame area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate wirings are provided for touch detection drive signals and display drive voltages, then both fast touch drive and display quality retention are achieved, but the frame area increases due to larger wiring width requirements
Solution Approach 1:
The patent combines the touch detection drive signal wiring and display drive voltage wiring into a single shared wiring structure. The wiring is designed to carry both signals sequentially, with the touch detection drive signal supplied during touch detection periods and the display drive voltage supplied during display periods, thereby reducing the total wiring width and frame area while maintaining performance
Solution Approach 2:
The patent employs periodic switching between touch detection mode and display mode. During touch detection periods, the wiring carries touch detection drive signals; during display periods, the same wiring carries display drive voltages. This time-division multiplexing allows a single wiring to serve dual purposes, reducing the required wiring width and frame area
2Speed
If wiring width is increased to maintain fast touch drive and display quality, then signal transmission performance is improved, but the frame area reduction is hindered
Solution Approach 1:
The patent merges the touch detection drive signal path and display drive voltage path into a single wiring structure. By designing the wiring to handle both signals sequentially with appropriate impedance control, the patent achieves fast touch drive performance without requiring separate wide wirings for each signal, thus reducing frame area
Solution Approach 2:
The patent uses periodic switching between touch detection and display operations. The wiring is optimized for fast signal transmission during touch detection periods when carryin g touch drive signals, and maintains display quality during display periods when carrying drive voltages. This time-division approach allows the same wiring to achieve both speed requirements without increased width
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 enables the reduction of frame area while ensuring both fast touch drive and display quality retention, with the wiring width of the potential fixing voltage being significantly narrowed, contributing to a more compact design.
Implementation Method 1
a display device with a touch detection function capable of detecting an external proximity object approaching from outside based on a change in electrostatic capacitance
Data Source
AI summary
A display device includes a plurality of pixel electrodes, a plurality of drive electrodes and a touch detection electrode. A display function layer is controlled by a voltage generated between the plurality of pixel electrodes and the plurality of drive electrodes in a display period, and touch detection is performed by detecting a voltage of the touch detection electrode in a touch detection period. In the display period, the plurality of drive electrodes are connected to a first wiring, and in the touch detection period, selected drive electrodes of the plurality of drive electrodes are connected to the first wiring, and the other non-selected drive electrodes of the plurality of drive electrodes are connected to a second wiring.