Foldable Display Pixel Compensation for Viewing Angle Artifacts
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Solution Overview
Problem
Flexible displays in mobile computing devices, such as foldable smartphones and tablets, experience visual artifacts like color and brightness variations when viewed at different angles due to their folded configurations, leading to inhomogeneous image perception.
Innovation Solution
A computing device with a display model stored in memory that adjusts pixel brightness and color based on viewing angles, using sensors to determine the folded configuration and user's viewing angles, applying fold-compensation factors to minimize these artifacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a flexible display is folded to enable compact device form factor, then device portability is improved, but visual uniformity deteriorates due to viewing angle variations
Solution Approach 1:
The patent applies local quality by adjusting display parameters (brightness, color) based on the specific viewing angle of each pixel. The display is divided into multiple zones corresponding to different viewing angles, and each zone receives customized compensation values from the look-up table to achieve uniform visual appearance across the folded display surface.
Solution Approach 2:
The patent changes display parameters (brightness, color temperature) dynamically based on viewing angle. A look-up table stores pre-calibrated compensation values for different viewing angles, and the system automatically selects and applies the appropriate parameters when the display is folded, thereby maintaining visual uniformity across different folding configurations.
2Stability of the object's composition
If pixel brightness and color are adjusted to compensate for viewing angle, then visual uniformity is improved, but device complexity increases due to additional sensors and processing
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing compensation values in a look-up table during manufacturing or initial setup. The table contains pre-determined brightness and color adjustments for various viewing angles, eliminating the need for complex real-time calculations during device operation. The sensor only needs to detect the current viewing angle and retrieve the corresponding pre-computed values.
3Measurement precision
If sensors are added to detect viewing angle and folded configuration, then display compensation accuracy is improved, but manufacturing cost increases
Solution Approach 1:
The patent applies universality by using sensors that serve multiple functions: detecting both the folded configuration state and the viewing angle simultaneously. This multi-functionality reduces the total number of sensors needed, thereby lowering manufacturing costs while maintaining high measurement precision for display compensation.
Data Source
AI summary
Foldable displays may have portions folded into a folded configuration. Each folded portion may be observed by a user at a different viewing angle. As such, folding-artifacts may appear in the displayed image as a result of the different viewing angles. For example, a perceptible color difference and/or a perceptible brightness difference may appear between folded portions. Disclosed here are systems and methods to create compensated images that when displayed reduced the folding artifacts. The creation may include sensing a viewing angle for each portion and determining adjustments for pixels in each portion using a display model. The display model may be created by measuring color and brightness of pixels for various folded configurations, view-points and/or viewing angles.