Layered Light-Blocking Display Pixels for Switchable Viewing Angles
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Solution Overview
Problem
Existing display devices lack the ability to dynamically adjust viewing angles based on emission modes, leading to limitations in image visibility and potential deterioration of subpixels.
Innovation Solution
A display device design where first and second pixels share a third subpixel, with each pixel having a unique light blocking layer configuration, allowing them to be driven in different periods and emission modes to achieve varying viewing angles and improve lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a light emitting display device includes pixels with subpixels and light blocking layers, then the display device can control emission areas and viewing angles, but the subpixels may deteriorate over time due to continuous operation
Solution Approach 1:
The patent implements dynamic pixel driving by alternating between first pixels and second pixels in different time periods. The first light blocking layer and second light blocking layer are selectively activated to control which pixels emit light during different periods, creating a dynamic operation mode that prevents continuous stress on any single subpixel group, thereby extending subpixel lifespan while maintaining display functionality.
2Adaptability or versatility
If the display device uses multiple light blocking layers with different configurations, then viewing angles can be adjusted based on emission modes, but the device structure becomes more complex
Solution Approach 1:
The patent divides the light blocking function into separate layers: a first light blocking layer associated with first pixels and a second light blocking layer associated with second pixels. Each layer can be independently configured and controlled, allowing flexible adjustment of viewing angles through different emission modes without requiring a single complex light blocking structure.
Solution Approach 2:
The first light blocking layer and second light blocking layer are designed to serve multiple functions: they control emission areas for their respective pixels, enable viewing angle adjustment through different emission modes (first emission mode, second emission mode), and work together in alternating periods to extend subpixel lifespan. This multi-functionality reduces the need for additional separate components.
3Reliability
If first pixels and second pixels share a third subpixel and are driven in different periods, then subpixel deterioration is reduced, but the driving control becomes more complex
Solution Approach 1:
The patent implements periodic driving by alternating between first pixels and second pixels in different time periods. During first periods, first pixels are driven while second pixels are off; during second periods, second pixels are driven while first pixels are off. This periodic operation allows shared subpixels to rest during periods when they are not actively emitting, reducing deterioration while maintaining a relatively simple control structure through regular alternating patterns.
Data Source
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AI summary
A display device includes a first pixel and a second pixel disposed in a first unit area among unit areas of a display area, each of the first pixel and the second pixel comprises a first subpixel and a second subpixel, and the first pixel and the second pixel share a third subpixel, a first light blocking layer disposed on a light emitting element layer which comprises light emitting elements of subpixels disposed in each of the unit areas, the first light blocking layer surrounds emission areas of the subpixels, and a second light blocking layer disposed on the first light blocking layer, the second light blocking layer surrounds the emission areas of the first subpixel and the second subpixel of the second pixel in the first unit area, wherein the first pixel and the second pixel are driven in different periods.