Display Driver Touch Detection Period Segmentation
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Solution Overview
Problem
Display devices with touch detection functions face reduced sensitivity in low-speed driving modes due to extended display adjustment periods, which compromise touch detection performance without altering the display or touch detection periods.
Innovation Solution
The implementation of a display device with a touch detection mechanism that allocates a second touch detection period within the extended display adjustment period, specifically within the perpendicular front porch period, maintains touch detection sensitivity while reducing power consumption by extending the frame period in low-speed driving.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the frame period is extended to reduce power consumption in low-speed driving, then power consumption is reduced, but touch detection sensitivity decreases due to extended display adjustment periods
Solution Approach 1:
The display adjustment period is segmented into a first display adjustment period and a second display adjustment period. The first period maintains normal touch detection sensitivity, while the second period (in low-speed driving) allows extended duration without compromising the overall touch detection performance. This segmentation enables the system to extend the total display adjustment period for power savings while preserving sensitivity during critical detection windows.
2Use of energy by stationary object
If the display adjustment period is extended to enable low-speed driving, then power consumption is reduced, but touch detection sensitivity decreases
Solution Approach 1:
The system dynamically adjusts the composition of the display adjustment period based on driving mode. In normal driving, the display adjustment period has a standard duration. In low-speed driving, the system extends the second display adjustment period while maintaining the first period's characteristics, thereby achieving power savings without permanently degrading touch detection sensitivity.
3Use of energy by moving object
If touch detection operation is not performed during extended display adjustment periods, then power consumption is reduced, but touch detection sensitivity (report rate) decreases
Solution Approach 1:
Touch detection operations are performed periodically during specific intervals within the display adjustment period. The system executes touch detection during the first display adjustment period and at strategically timed intervals within the second display adjustment period, creating a periodic detection pattern that maintains adequate report rate while allowing power savings during non-detection intervals.
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 reduced power consumption and maintains touch detection sensitivity in low-speed driving modes without degrading image quality, as the touch detection periods are synchronized with the extended display adjustment periods, ensuring consistent performance.
Implementation Method 1
When a finger is in contact with the screen of the display device having a touch detection function, the capacitance (value) changes in the portion in which the drive electrode intersects the detection electrode. In a capacitive system, contact with a finger on the screen can be detected by using the change in capacitance.
Data Source
AI summary
According to one embodiment, a display device includes a display panel configured to perform display operation based on a pixel signal in a display period, a detector configured to perform touch detection operation in touch detection periods, and a driver configured to control frame operations. The driver is configured to control a first frame operation in a first frame periods including the display period, a first touch detection period and a first display adjustment period, and control a second frame operation in a second frame periods including the display period, a first touch detection period and a second display adjustment period. The second display adjustment period is longer than the first display adjustment period and includes the second touch detection period.