Rollable Display Degradation Balancing via Periodic Charging
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Solution Overview
Problem
Rollable display devices face increased power consumption and degradation differences between display areas when one area is withdrawn and another is inserted, leading to inefficient energy use and uneven wear.
Innovation Solution
A display device with a processor that drives the first display area in a display mode and the second area in a charging mode, balancing degradation levels by adjusting grayscale and driving time based on illuminance and charging information, ensuring the second area is charged while minimizing power consumption and degradation disparities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the second display area is driven to display an image while inserted into the housing, then the battery is charged, but power consumption increases
Solution Approach 1:
The patent applies local quality by driving only specific regions (first and second regions) of the display panel at different times. The first region is driven during the day mode to display images, while the second region is driven during night mode to charge the battery. This spatial differentiation allows charging functionality without requiring the entire display area to be active, thereby reducing overall power consumption compared to driving the full display panel.
2Use of energy by moving object
If only the first display area is driven while the second display area remains inactive, then power consumption is reduced, but degradation difference between the two areas increases
Solution Approach 1:
The patent implements periodic action by alternating between day mode and night mode operation. During day mode, the first region is driven to display images. During night mode, the second region is driven to charge the battery. This periodic switching ensures that both regions of the display panel are utilized over time, distributing the degradation load evenly across the entire display panel and preventing significant degradation differences between the first and second areas.
3Area of stationary object
If the display panel is fully withdrawn from the housing, then the display area is maximized, but the device loses its compact storage advantage
Solution Approach 1:
The patent applies segmentation by dividing the display panel into multiple regions (first region, second region, and potentially additional regions) that can be selectively driven. This allows the display to function in different configurations: the entire panel can be withdrawn for maximum display area, or only specific regions can be active while the panel remains partially inserted, maintaining compact storage while providing sufficient display functionality for charging or viewing.
Data Source
AI summary
A display device includes a housing, a display panel inserted into or withdrawn from the housing. The display panel includes a first display area and a second display area adjacent to the first display area with a boundary line therebetween, a battery which provides a power to the display panel, and a processor which drives the first display area in a display mode, in which the display panel displays an image in a state in which the first display area is withdrawn from the housing and the second display area is inserted into the housing. The processor drives the second display area in a charging mode, in which the battery is charged, in a way such that an average of degradation degrees of second pixels included in the second display area is equal to an average of degradation degrees of first pixels included in the first display area.