Touch Detection Drive Circuit Time Division Multiplexing
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Solution Overview
Problem
Display apparatuses with touch detection functions have a larger circuit area due to the need for additional drive circuits, leading to increased size and complexity.
Innovation Solution
The implementation of a display apparatus with a touch detection function that includes a plurality of common drive electrodes and a scan drive section, which applies display and touch-detection drive signals sequentially by time division, allowing for miniaturization by reducing the occupied circuit area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a drive circuit for touch detection operation is added to the display apparatus, then touch detection function is improved, but the occupied circuit area increases
Solution Approach 1:
The patent merges the drive circuit for display operation and the drive circuit for touch detection operation into a single integrated scan drive section. This unified structure shares common components such as the scan signal generation circuitry and drive signal distribution network, thereby enabling touch detection functionality without proportionally increasing the occupied circuit area.
Solution Approach 2:
The scan drive section is designed with multi-functionality, serving both display driving and touch detection driving purposes. By implementing a universal drive mechanism that can operate in different modes (display mode and touch detection mode), the patent eliminates the need for separate dedicated circuits, thus reducing the overall circuit area while maintaining both functions.
2Adaptability or versatility
If separate drive circuits are used for display and touch detection, then functional independence is improved, but device complexity increases
Solution Approach 1:
The scan drive section implements dynamic operation modes that can switch between display driving and touch detection driving based on operational requirements. Through time-division multiplexing and mode switching mechanisms, the single drive circuit can independently perform different functions at different time intervals, maintaining functional independence without requiring separate permanent circuits.
Solution Approach 2:
The patent employs periodic scan driving sequences where the scan drive section alternates between display scan cycles and touch detection scan cycles. This periodic operation allows the unified drive circuit to service both display and touch detection functions systematically, reducing circuit complexity while preserving functional independence through temporal separation.
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 miniaturization of the display apparatus by reducing the circuit size and improving touch detection response performance, while maintaining display functionality.
Implementation Method 1
A capacitance is formed between the common electrode and the touch detection electrode, and the capacitance changes in accordance with an external approaching object
Data Source
AI summary
A display apparatus with a touch detection function, includes: a plurality of common drive electrodes disposed in parallel so as to extend in one direction; a display element displaying on the basis of a pixel signal and a display drive signal; a touch detection element detecting an external approaching object on the basis of a touch-detection drive signal; and a scan drive section performing first scan driving to apply the display drive signal to the plurality of common drive electrodes sequentially by time division and second scan driving having a scan speed different from a scan speed of the first scan driving to apply the touch-detection drive signal to the plurality of common drive electrodes sequentially by time division, wherein the scan drive section drives the common drive electrodes for each plurality of the electrodes in the first and the second scan driving.