Reflector Shift for Viewing Angle Control in Display Devices
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Solution Overview
Problem
Existing display devices face challenges in controlling the viewing angle of emitted light while maintaining high luminance, particularly in improving light extraction efficiency and achieving desired viewing angle characteristics for each pixel.
Innovation Solution
A display device configuration that includes a plurality of light emitting sections and reflectors positioned above them, where the reflectors are arranged to shift their centers from the centers of the luminescence surfaces of the light emitting sections, allowing for the reflection of light emitted in undesired directions and controlling the light emission direction to achieve a desired viewing angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light emitting sections are used to increase brightness, then luminance is improved, but viewing angle control becomes difficult
Solution Approach 1:
The patent divides the light extraction function into multiple sections: a first light extracting section with a specific refractive index for extracting light in a first direction, and a second light extracting section with a different refractive index for extracting light in a second direction. This segmentation allows independent optimization of light extraction in different directions, enabling both high luminance and viewing angle control.
Solution Approach 2:
The patent applies different refractive index characteristics to different spatial regions: the first light extracting section has a first refractive index optimized for extracting light in a first direction, while the second light extracting section has a second refractive index optimized for extracting light in a second direction. This local quality differentiation enables direction-specific light extraction control while maintaining overall high luminance.
2Illumination intensity
If light extraction efficiency is improved by adding extraction structures, then luminance increases, but device complexity increases
Solution Approach 1:
The patent integrates multiple functions into the pixel electrode structure: the pixel electrode serves both as an electrical component for driving the light emitting element and as an optical component (light extracting section) with specific refractive index characteristics. This multi-functionality reduces device complexity by eliminating separate light extraction structures while maintaining high light extraction efficiency and viewing angle control.
Solution Approach 2:
The patent utilizes changes in refractive index parameters of existing layers (pixel electrode, pixel defining insulation film) to achieve light extraction enhancement. By adjusting the refractive index characteristics of these existing components rather than adding new structures, the patent improves light extraction efficiency while minimizing increases in device complexity.
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 configuration enhances light extraction efficiency while ensuring a desired viewing angle characteristic for each pixel, effectively addressing the limitations of existing technologies.
Implementation Method 1
reflectors provided above the light emitting sections with respect to the plurality of light emitting sections positioned in at least a partial region of a display surface, lower surfaces of the reflectors reflecting part of emission light from the light emitting sections
Data Source
AI summary
[Object] To make it possible to improve light extraction efficiency while realizing a desired viewing angle characteristic for each pixel.[Solution] Provided is a display device, including: a plurality of light emitting sections formed on a substrate; and reflectors provided above the light emitting sections with respect to the plurality of light emitting sections positioned in at least a partial region of a display surface, lower surfaces of the reflectors reflecting part of emission light from the light emitting sections. The light emitting sections and the reflectors are arranged in a state in which centers of the reflectors are shifted from centers of luminescence surfaces of the light emitting sections in a plane perpendicular to a stacking direction so that light emitted in a direction other than a desired direction among the emission light from the light emitting sections is reflected.