Irregular Lens Patterns in OLED Light Guide for Reflection and Mura
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing organic light emitting display apparatuses face challenges in reducing reflectance from external light and improving internal light extraction efficiency, while also minimizing the occurrence of rainbow mura and sparkle phenomena.
Innovation Solution
The apparatus includes a substrate with organic light emitting elements, an optical control layer with a black matrix, and a light guide member with irregularly arranged lens patterns and a refractive layer, which together enhance light extraction efficiency, reduce external light reflection, and minimize sparkle and rainbow mura phenomena.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a polarizing plate is used to reduce external light reflection, then reflectance is reduced, but device complexity increases and viewing angle is limited
Solution Approach 1:
The patent extracts and removes the polarizing plate from the display device structure, replacing it with a polarizing-free optical compensation layer that achieves the same anti-glare effect without the limitations of polarizing plates
Solution Approach 2:
The patent changes the optical parameters by introducing an optical compensation layer with specific refractive index and thickness parameters that compensate for polarization effects without requiring a polarizing plate, thereby reducing external light reflection while maintaining broad viewing angles
2Illumination intensity
If a lens pattern is added to improve light extraction efficiency, then internal light extraction is improved, but sparkle phenomenon occurs
Solution Approach 1:
The patent uses a composite structure combining an optical compensation layer with specific refractive index properties and the lens pattern, creating a composite optical system that improves light extraction while suppressing sparkle through the interaction of different optical materials
Solution Approach 2:
The patent optimizes the refractive index parameter of the optical compensation layer and the geometric parameters of the lens pattern to achieve a balance where light extraction efficiency is maximized while sparkle phenomenon is minimized through precise parameter control
3Illumination intensity
If regular lens patterns are used to enhance light extraction, then light extraction efficiency is improved, but rainbow mura phenomenon occurs
Solution Approach 1:
The patent introduces asymmetry by placing an optical compensation layer with asymmetric optical properties over the lens pattern, which disrupts the regular diffraction pattern that causes rainbow mura while maintaining the light extraction enhancement provided by the lens structure
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 solution effectively improves light extraction efficiency, reduces external light reflection, and minimizes the occurrence of rainbow mura and sparkle phenomena, leading to enhanced display quality and reduced power consumption.
Implementation Method 1
a refractive layer disposed on the plurality of lens patterns and having a second refractive index different from the first refractive index
Implementation Method 2
having a shape with an irregularity enough to reduce an intensity of a diffraction dispersion spectrum generated by the plurality of organic light emitting elements
Data Source
AI summary
An organic light emitting display apparatus includes a substrate; a plurality of organic light emitting elements disposed on the substrate; an optical control layer disposed on the plurality of organic light emitting elements; and a light guide member on the optical control layer; wherein the optical control layer includes a black matrix disposed at a boundary of adjacent organic light emitting elements among the plurality of organic light emitting elements; and wherein the light guide member includes a plurality of lens patterns having an irregular arrangement structure and a first refractive index; and a refractive layer disposed on the plurality of lens patterns and having a second refractive index different from the first refractive index.