Electro-optical Device Light Resonance Structure
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Solution Overview
Problem
Existing electro-optical devices with light resonance structures maximize light intensity in the normal direction, limiting the effectiveness of lens sections in improving light extraction efficiency.
Innovation Solution
An electro-optical device with a semi-transmissive reflective layer, a reflective layer, a light-emitting layer, and a lens, where the optical distance between the reflective layer and the semi-transmissive reflective layer satisfies the condition L0 > (m+½)λ/2, enhancing light intensity at inclined angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the optical distance of the light resonance structure is set to maximize light intensity in the normal direction, then the light intensity at 0° is maximized, but the light extraction efficiency improvement by the lens section is not sufficiently obtained
Solution Approach 1:
The patent changes the optical distance parameter of the light resonance structure from the conventional value that maximizes normal-direction intensity to a specific range L0 > (m+½)λ/2. This parameter change shifts the resonance characteristics to enhance light intensity at inclined angles rather than normal direction, thereby enabling the lens section to effectively improve light extraction efficiency.
2Illumination intensity
If the light resonance structure is designed to resonate light at the peak wavelength in the normal direction, then the display intensity at 0° is maximized, but the overall light extraction efficiency is limited
Solution Approach 1:
Instead of designing the light resonance structure to maximize light intensity in the normal direction (conventional approach), the patent inverts the design by setting the optical distance to maximize light intensity at inclined angles. This inversion allows the lens section to effectively collect and direct light, thereby improving overall light extraction efficiency while maintaining adequate display intensity.
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 improves light extraction efficiency by increasing light intensity at angles other than the normal direction, effectively utilizing the lens section to enhance light emission.
Implementation Method 1
light resonance structure is provided that resonates light emitted by the light-emitting layer, between an interface between the first electrode and the organic layer, and an interface between the second electrode and the organic layer
Implementation Method 2
Light emitted from the light-emitting layer through the second electrode passes through the lens section. In this display device, total reflection at an interface between the transparent upper substrate and the air is caused by the lens section, and an optical path of light that cannot be emitted into air is bent
Implementation Method 3
a semi-transmissive reflective layer having light-reflectivity and light-transparency
Data Source
AI summary
An electro-optical device including a semi-transmissive reflective layer having light-light-reflectivity and light-transparency, a reflective layer disposed between the substrate and the semi-transmissive reflective layer, a light-emitting layer disposed between the reflective layer and the semi-transmissive reflective layer, and a lens that is disposed corresponding to a pixel, and on which light emitted from the light-emitting layer is incident, is provided. The electro-optical device satisfies the following (Formula 1) below, where an optical distance between the reflective layer and the semi-transmissive reflective layer is L0, a peak wavelength of a light emission spectrum of the light-emitting layer is λ, and a natural number is m.L0>(m+½)λ/2 (Formula 1)