Time-Division Touch Detection Signal Separation
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Solution Overview
Problem
Display devices with touch detection capabilities face issues due to the interference between touch detection signals and display operation signals, leading to erroneous operations as both signals are present in the touch detection signal.
Innovation Solution
The implementation of a display device with a scan driving unit that applies display drive signals and touch detection drive signals in a time-divisional manner, ensuring that the touch detection signal is output separately from the display signal, and the use of a detection circuit to differentiate between the two signals based on their waveforms and timing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the common electrode is used for both display operation and touch detection operation, then device complexity is reduced, but measurement precision deteriorates due to interference between display signals and touch detection signals
Solution Approach 1:
The patent applies periodic action by time-divisionally switching between display drive signals and touch detection drive signals. The scan driving unit alternates between applying display signals during display periods and touch detection signals during detection periods, allowing both functions to share the same electrode while avoiding signal interference. This periodic switching enables accurate touch detection without requiring separate electrodes.
2Productivity
If display drive signal and touch detection drive signal are applied simultaneously to the same electrode, then productivity is improved, but reliability deteriorates due to erroneous operations
Solution Approach 1:
The patent implements periodic action through time-divisional signal application. The scan driving unit sequentially applies display drive signals during display periods and touch detection drive signals during detection periods to the same common electrode. This periodic switching maintains high operational efficiency while ensuring reliable touch detection by preventing signal interference through temporal separation of the two signal types.
3Device complexity
If the touch detection signal is extracted from the same electrode used for display, then device complexity is reduced, but loss of information increases due to signal interference
Solution Approach 1:
The patent uses periodic action by implementing time-divisional switching between display and touch detection operations. The scan driving unit alternates between applying display drive signals and touch detection drive signals to the common electrode, ensuring that touch detection signals are extracted during periods when display signals are not active. This approach maintains simple electrode configuration while preserving signal integrity by eliminating interference 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 minimizes the influence of display operations on touch detection, allowing for accurate and separate output of touch detection signals, thereby reducing erroneous operations.
Implementation Method 1
allowing electrostatic capacitance to be formed at each intersection... detecting the external proximity object based on a touch detection signal which is outputted from the detection electrode
Data Source
AI summary
A display device includes: a plurality of drive electrodes; a plurality of detection electrodes intersecting the plurality of drive electrodes; and a scan driving unit performing a first scan drive and a second scan drive. The first scan drive allows a display drive signal for driving the display elements to be applied to each of the plurality of common drive electrodes, and the second scan drive allows a touch detection drive signal for detecting an external proximity object to be applied to each of the plurality of common drive electrodes.