Foldable Display Brightness Compensation via Integrated Light Detection
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Solution Overview
Problem
Existing brightness compensation methods for foldable display products, such as foldable mobile phones and notebook computers, are not accurate in detecting the difference in brightness attenuation between the main and secondary screens, leading to uneven display effects when unfolded.
Innovation Solution
A display substrate with a drive structure layer, a light-emitting element, and a light detection unit is used, where the light detection unit includes a third electrode, a photosensitive active layer, and a fourth electrode to directly detect the brightness of the light-emitting element, allowing for real-time brightness compensation across multiple display regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If indirect brightness detection through electrical characteristics is used, then the detection process is simplified, but the measurement precision deteriorates
Solution Approach 1:
The patent introduces a photosensitive active layer as an intermediary component between the light-emitting element and the detection circuit. This photosensitive layer converts optical brightness information into electrical signals, serving as a mediator that enables direct optical detection while maintaining system integration. The intermediary resolves the contradiction by providing a dedicated optical-to-electrical conversion pathway that preserves measurement precision without significantly increasing overall system complexity.
Solution Approach 2:
The patent replaces indirect electrical characteristic-based detection with direct optical detection using the photosensitive active layer. This substitution transitions from inferring brightness through electrical parameters to directly measuring optical properties, thereby improving measurement precision while maintaining a relatively simple integrated structure within the display substrate.
2Productivity
If indirect brightness compensation is implemented, then the compensation process is faster, but the reliability deteriorates
Solution Approach 1:
The patent implements a direct feedback mechanism where the photosensitive active layer continuously monitors the actual brightness output of the light-emitting element and feeds this information back to the drive circuit. This closed-loop feedback system uses accurate direct brightness measurements rather than inferred electrical characteristics, thereby improving compensation reliability while maintaining real-time processing capability through integrated circuit operation.
Solution Approach 2:
The display substrate performs self-diagnosis and self-compensation by integrating the photosensitive detection capability directly into the substrate structure. The system automatically detects its own brightness output and adjusts drive signals accordingly, eliminating the need for external detection equipment and enabling rapid autonomous compensation with high reliability through direct optical measurement.
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 solution enables accurate and real-time brightness detection and compensation, ensuring uniform brightness across different display regions, thereby improving the display effect in the unfolded state of foldable devices.
Implementation Method 1
a light detection unit disposed on the light-emitting element and configured to detect brightness of the light-emitting element; the light detection unit includes a third electrode, a photosensitive active layer and a fourth electrode which are stacked
Data Source
AI summary
A display substrate, a preparation method and a brightness compensation method therefor, and a display apparatus are provided. The display substrate includes a drive structure layer disposed on a substrate, a light-emitting element disposed on the drive structure layer, and a light detection unit which is disposed on the light-emitting element and is configured to detect the brightness of the light-emitting element, wherein the drive structure layer includes a pixel drive circuit, the light-emitting element includes a first electrode, an organic functional layer and a second electrode which are stacked on the drive structure layer, and the first electrode is connected to the pixel drive circuit; and the light detection unit includes a third electrode, a photosensitive active layer and a fourth electrode which are stacked.