Dual-Green Subpixel Display Layout for Switchable Privacy Viewing
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Solution Overview
Problem
Existing display devices face issues with display quality deterioration at high viewing angles, particularly when personal information is displayed in public places and needs to be protected from being visible to surrounding individuals.
Innovation Solution
The display device employs a dual-mode operation with different sub-pixel luminance settings and bank structures to adjust viewing angles, using first and second green sub-pixels with varying luminance and aperture ratios, and additional banks to control light emission, allowing for wide and narrow viewing angles based on user needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the viewing angle is increased to improve visibility, then more people can see the display, but display quality deteriorates at high viewing angles
Solution Approach 1:
The display device segments the green sub-pixels into two distinct groups: first green sub-pixels with a first aperture ratio and second green sub-pixels with a second aperture ratio. This segmentation allows different portions of the display to serve different viewing angle requirements, resolving the contradiction between wide viewing angle and display quality at high angles.
Solution Approach 2:
Different aperture ratios are assigned to different green sub-pixel groups based on their functional requirements. The first green sub-pixels use a first aperture ratio optimized for wide viewing angles, while the second green sub-pixels use a second aperture ratio optimized for maintaining display quality at high viewing angles. This local differentiation resolves the contradiction by optimizing each region for its specific purpose.
2Illumination intensity
If the aperture ratio is increased to improve luminance, then display brightness improves, but viewing angle control becomes difficult
Solution Approach 1:
The green sub-pixels are segmented into two groups with different aperture ratios. The first green sub-pixels have a larger aperture ratio for higher luminance output, while the second green sub-pixels have a smaller aperture ratio for better viewing angle control. This segmentation allows the display to achieve both high luminance and viewing angle control simultaneously.
Solution Approach 2:
Different aperture ratios are applied locally to different green sub-pixel groups. The first green sub-pixels use a larger aperture ratio to provide high luminance, while the second green sub-pixels use a smaller aperture ratio to maintain viewing angle control. This local quality differentiation resolves the contradiction between luminance and viewing angle control.
3Reliability
If sub-pixels are driven at high luminance to maintain display quality, then display quality is maintained, but privacy protection is reduced
Solution Approach 1:
The display device dynamically switches between two operating modes: a first mode that drives both first and second green sub-pixels at high luminance for optimal display quality, and a second mode that drives only the second green sub-pixels at lower luminance for privacy protection. This dynamic switching resolves the contradiction between display quality and privacy protection by adapting to different usage scenarios.
Solution Approach 2:
In the second mode, only the second green sub-pixels with smaller aperture ratios are driven, which naturally limit the viewing angle and protect privacy. The first green sub-pixels with larger aperture ratios remain inactive. This selective local driving maintains display quality for the intended user while reducing visibility to unintended viewers.
Data Source
AI summary
A display device operating in a first mode and a second mode includes first green sub-pixels, and second green sub-pixels having a viewing angle less than that of the first green sub-pixels. In the first mode and the second mode, the first green sub-pixels and the second green sub-pixels are driven.