Subpixel Scattering Layer Layout for Uniform Display Brightness
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Solution Overview
Problem
Existing display devices face challenges in achieving low power consumption, improved brightness uniformity across viewing angles, and preventing image quality degradation due to the use of scattering layers.
Innovation Solution
A display device design featuring a substrate with subpixels, light-emitting elements, bonding layers, and a scattering layer that surrounds the bonding layers to enhance light extraction efficiency and uniformity, while minimizing image quality degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a scattering layer is used to improve light extraction efficiency, then power consumption is reduced, but image quality degradation occurs
Solution Approach 1:
The scattering layer is applied selectively only in the non-display area surrounding the light-emitting elements, while the display area maintains original optical properties. This localized application allows light extraction enhancement where needed without compromising image quality in the display region.
Solution Approach 2:
The device structure is divided into display area and non-display area, with the scattering layer applied only to the non-display area. This segmentation allows different optical treatments in different regions to simultaneously achieve power efficiency and image quality.
2Illumination intensity
If a scattering layer is used to improve light extraction efficiency, then brightness uniformity across viewing angles should improve, but image quality degradation occurs
Solution Approach 1:
The scattering layer is positioned only in the non-display area, providing brightness uniformity enhancement through light scattering while preserving image quality in the display area by avoiding scattering material in that region.
Solution Approach 2:
The scattering layer acts as an intermediary element in the non-display area that redirects light paths to improve viewing angle uniformity without directly interfering with the light emission from the display area, thus maintaining image quality.
3Loss of energy
If scattering layers are placed over light-emitting elements, then light extraction efficiency improves, but image quality degrades
Solution Approach 1:
The scattering layer is extracted from the display area and relocated to the non-display area surrounding the light-emitting elements. This extraction eliminates the harmful image quality degradation caused by scattering in the display region while preserving the beneficial light extraction enhancement.
Solution Approach 2:
Different regions are treated differently: the display area maintains optimal optical properties for image quality, while the non-display area incorporates the scattering layer for enhanced light extraction efficiency.
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
The design improves light extraction efficiency, enhances brightness uniformity across viewing angles, and prevents image quality degradation by optimizing light path redirection without scattering layers over the light-emitting elements.
Implementation Method 1
a scattering layer on a same plane as the plurality of bonding layers, the scattering layer surrounding the plurality of bonding layers
Data Source
AI summary
A display device presented herein comprises a substrate with a plurality of subpixels on the substrate, a plurality of light-emitting elements on the substrate in each of the plurality of subpixels, a plurality of bonding layers between the plurality of light-emitting elements and the substrate, the plurality of bonding layers overlapping the plurality of light-emitting elements, and a scattering layer on a same plane as the plurality of bonding layers, the scattering layer surrounding the plurality of bonding layers. The display device presented herein features increased efficiency in extracting light, enhanced brightness uniformity depending on the viewing angle, and suppressed image quality degradation.