Variable-Speed Pixel Scanning for Uniform Display Emission
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Solution Overview
Problem
Existing display technologies experience degradation in display quality due to biased light emission areas and current flow, particularly when the same signal is written to multiple pixels, leading to issues like flickering and uneven current distribution.
Innovation Solution
A display apparatus with a dual scanning system where the scanning speed of the first and second selection lines differs for regions with varying resolutions, ensuring uniform light emission and reducing current fluctuations by maintaining a constant scanning speed for high-resolution regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the same signal is written to multiple pixels to display low-resolution regions, then the display coverage is improved, but the light emission area becomes biased in time causing current flow degradation
Solution Approach 1:
The display region is segmented into multiple regions with different resolutions (first region with first resolution and second region with second resolution). Different scanning speeds are applied to different regions, allowing the low-resolution region to be scanned faster while maintaining uniform current distribution across all pixels, thus preventing display quality degradation while achieving comprehensive display coverage.
Solution Approach 2:
The scanning speed is made dynamic rather than uniform across all regions. The scanning circuit scans the low-resolution region at a first scanning speed and the high-resolution region at a second scanning speed. This dynamic adjustment of scanning speed allows efficient coverage of the entire display area while maintaining uniform light emission and current distribution, preventing the temporal bias that causes display quality degradation.
2Productivity
If different scanning speeds are applied to different resolution regions, then the display efficiency is improved, but the device complexity increases due to dual scanning circuits
Solution Approach 1:
The scanning circuit is designed with multi-functionality to perform both first scanning (for low-resolution regions) and second scanning (for high-resolution regions). By making the scanning circuit universal and capable of operating in multiple modes with different scanning speeds, the patent avoids the need for completely separate scanning circuits, thereby reducing device complexity while maintaining high display efficiency.
Data Source
AI summary
A display apparatus includes a display area including pixels arranged in a matrix, the pixels including a light emitting element, a write control transistor, a light emission control transistor, and a drive transistor; a first selection line for each row of the pixels and connected to the write control transistors; a second selection line for each row of the pixels and connected to the light emission control transistors; a first scanning circuit which scans the first selection lines; and a second scanning circuit which scans the second selection lines. Image data displayed in the display area is divided into regions having different resolutions, a speed of scanning by the first scanning circuit is different for each region, and a speed of scanning by the second scanning circuit is a lowest speed of the speed of scanning by the first scanning circuit and less than a maximum speed thereof.