Electrophoresis Display Floating Electrode Touch Detection
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Solution Overview
Problem
Existing electrophoresis display devices misidentify touches when light is shielded by objects other than a human finger, leading to sensing errors, and they consume excessive power as they constantly apply output control signals even when the touch function is not used.
Innovation Solution
The electrophoresis display device incorporates a thin film transistor array substrate with a sensor and an output transistor, along with an ink film having a common electrode and a floating electrode, where the output transistor only outputs the sensing signal when a touch current is generated on the floating electrode, and the output control signal is applied only during actual touches, reducing power consumption by maintaining the output transistor in an off-state during normal conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the output transistor constantly applies output control signals to output the sensing signal, then the touch function is always active, but power consumption increases excessively
Solution Approach 1:
The output transistor applies output control signals periodically or on-demand rather than constantly. The control signal is applied only when a touch event is detected through the floating electrode, allowing the touch function to remain available while significantly reducing power consumption during non-touch periods.
2Measurement precision
If the sensor continuously generates sensing signals, then touch detection is always possible, but sensing errors occur when light is shielded by objects other than human fingers
Solution Approach 1:
The floating electrode acts as an intermediary between the external environment and the sensor. It detects touch events through capacitive coupling and triggers the output control signal only when actual contact occurs, preventing false detections caused by light shielding from objects other than human fingers.
3Ease of operation
If the output transistor remains in on-state to ensure touch signal output, then sensing signals are always transmitted, but unnecessary power is consumed during normal conditions
Solution Approach 1:
The output transistor transitions from a static on-state to a dynamic state controlled by touch detection. It switches between off-state (normal conditions) and on-state (touch detected) based on the presence of touch events, ensuring signal transmission continuity when needed while eliminating unnecessary power consumption during normal operation.
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 solution prevents sensing errors by ensuring that the sensing signal is only output during actual touches and reduces power consumption by eliminating unnecessary output control signal applications, thereby enhancing the accuracy and efficiency of the display device.
Implementation Method 1
a sensor configured to generate a sensing signal
Implementation Method 2
a floating electrode formed on a second side surface of the base film, wherein the output transistor outputs the sensing signal when a touch current is generated on the floating electrode
Data Source
AI summary
An electrophoresis display device adapted to prevent sensing errors and to reduce electric power consumption is disclosed. The electrophoresis display device includes a thin film transistor array substrate and an ink film. The thin film transistor array substrate includes a sensor configured to generate a sensing signal, and an output transistor configured to be connected to the sensor and to control the output of the sensing signal. The ink film includes a common electrode and an ink layer, which are formed on one side surface of a base film, and a floating electrode formed on the other side surface of the base film. The output transistor outputs the sensing signal when a touch current is generated on the floating electrode. The electrophoresis display device only outputs the sensing signal when a substantial touch occurs. Therefore, the electrophoresis display device can prevent sensing errors and reduce electric power consumption.