Flexible Display Touch Control for Hidden Area Power Saving
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Solution Overview
Problem
Existing display devices with flexible panels face challenges in managing touch detection efficiency and power consumption when the display area changes due to deformation, such as folding or bending, as current methods do not differentiate between visible and non-visible areas effectively.
Innovation Solution
The display device incorporates a touch driver that controls hidden driving and sensing signals differently for non-visible areas of a flexible display panel, inactivating touch detection in these areas and using edge sensing signal copying to enhance touch position accuracy without additional power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If touch detection is continuously activated across the entire flexible display panel, then touch detection coverage is improved, but power consumption increases
Solution Approach 1:
The flexible display panel is divided into valid display area and hidden display area. The touch driver selectively activates touch detection only in the valid display area where images are displayed, while inactivating touch detection in the hidden display area. This segmentation allows the system to maintain adequate touch detection coverage in visible regions while reducing power consumption by excluding non-visible regions from active monitoring.
2Use of energy by moving object
If touch detection is inactivated in hidden display area, then power consumption is reduced, but touch position detection accuracy at edges deteriorates
Solution Approach 1:
The touch driver copies sensing signals from the valid display area to compensate for the inactivated hidden display area. Specifically, sensing signals from sensing electrodes adjacent to the hidden display area are replicated and used to maintain accurate touch position detection at the edge regions, ensuring that touch position accuracy is preserved even when touch detection is inactivated in the hidden display area.
3Adaptability or versatility
If the flexible display panel is deformed, then display adaptability is improved, but touch detection reliability deteriorates due to area changes
Solution Approach 1:
The system dynamically adjusts touch detection configuration based on the deformation state of the flexible display panel. When the panel is deformed and the hidden display area changes, the touch driver automatically updates which regions are classified as valid versus hidden areas, and相应ly adjusts touch detection activation and sensing signal copying strategies. This dynamic adaptation maintains touch detection reliability across various panel configurations.
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 reduces power consumption and improves touch position detection accuracy by selectively managing touch detection based on panel deformation, ensuring efficient operation across varying display configurations.
Implementation Method 1
The touch sensing part of the touch sensor includes a plurality of electrodes, and determines a touched point by sensing a change in capacitance formed in the plurality of electrodes.
Implementation Method 2
The touch driver controls at least one of hidden driving signals and hidden sensing signals, which correspond to a hidden display area of the flexible display panel, to be different from at least one of the driving signals and the sensing signals, which correspond to the valid display area.
Data Source
AI summary
A display device includes a flexible display panel in which a valid display area viewable to a user is extended or reduced, a touch sensing part overlapping the flexible display panel and including first sensing electrodes and second sensing electrodes intersecting the first sensing electrodes, a touch driver for providing driving signals to the first sensing electrodes, and detecting a touch by using sensing signals supplied from the second sensing electrodes, and a display driver for driving the flexible display panel such that an image is displayed in the valid display area. The touch driver controls at least one of hidden driving signals and hidden sensing signals, which correspond to a hidden display area of the flexible display panel which is not viewable to the user, to be different from at least one of the driving signals and the sensing signals, which correspond to the valid display area.