Foldable Display Panel Aging Uniformity via Local Current Density
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Solution Overview
Problem
Foldable display panels experience uneven aging and color difference between the main and secondary screens due to differential light-emitting device degradation, leading to inconsistent display brightness and user experience issues.
Innovation Solution
The foldable display panel operates in two states: in the first state, only the first display area is lit, while in the second state, both areas are lit with the second display area receiving a higher drive current density than the first, thereby accelerating its aging and reducing the difference in aging speeds between the two areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the first display area is light-emitted for a longer period than the second display area, then the display area coverage is improved, but the aging uniformity deteriorates
Solution Approach 1:
The patent applies different drive current densities to different display areas based on their usage patterns. Specifically, the second display area (which is light-emitted for a shorter period) receives a higher drive current density than the first display area, creating localized quality differences that compensate for unequal usage times and achieve uniform aging across both areas.
2Duration of action of stationary object
If the drive current density of the second display area is increased, then the aging speed of the second display area is accelerated, but the energy consumption increases
Solution Approach 1:
The patent implements localized quality adjustment by applying different drive current densities to different display areas. The second display area receives a higher drive current density to accelerate its aging, while the first display area receives a lower drive current density, thereby achieving aging uniformity without proportionally increasing overall energy consumption.
3Stability of the object's composition
If the drive current density of the first display area is decreased, then the aging speed of the first display area is reduced, but the display brightness may be affected
Solution Approach 1:
The patent applies different drive current densities to different display areas based on their specific usage characteristics. The first display area, which is light-emitted for a longer period, receives a lower drive current density to reduce its aging speed, while the second display area receives a higher drive current density to accelerate its aging, thereby achieving uniform aging across both areas while maintaining adequate display brightness.
Data Source
AI summary
Disclosed are a foldable display panel and a foldable display apparatus. The foldable display panel includes a first display area and a second display area which are connected in a foldable manner. When the foldable display panel is in a first state, the first display area is light-emitted and the second display area is not light-emitted; and when the foldable display panel is in a second state, both the first display area and the second display area are light-emitted. A density of a drive current of the second display area is set to be greater than a density of a drive current of the first display area when the first display area and the second display area are in the second state.