OLED Display Optical Unit Suppressing Reflection
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Solution Overview
Problem
OLED displays face challenges in maintaining high contrast and visibility when viewed outdoors due to sunlight reflection by metal reflective layers, which requires the use of a circular polarizing plate, increasing thickness and weight, and limiting flexibility, while also increasing the risk of defects from multiple stacked layers.
Innovation Solution
An OLED display with an optical unit comprising a metal material film and a dielectric material film, alternately stacked to achieve high transmittance and suppress external light reflection, eliminating the need for a circular polarizing plate, thereby reducing thickness and enhancing flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a circular polarizing plate is used to suppress external light reflection, then visibility and contrast ratio are improved, but thickness and weight increase
Solution Approach 1:
The patent uses a composite optical unit comprising a metal material film and a dielectric material film stacked together. This composite structure achieves external light reflection suppression with high transmittance, replacing the circular polarizing plate and thereby reducing thickness while maintaining visibility and contrast ratio.
Solution Approach 2:
The patent optimizes the optical parameters of the metal material film (optical absorption rate of 40% or higher, refractive index from 0.5 to 7) and the dielectric material film to achieve the desired balance between reflection suppression and light transmission, eliminating the need for thick polarizing plates.
2Illumination intensity
If a circular polarizing plate is used to suppress external light reflection, then visibility and contrast ratio are improved, but weight increases
Solution Approach 1:
The composite optical unit with metal and dielectric material films achieves the same visibility and contrast ratio improvement as circular polarizing plates but with significantly reduced weight, making the OLED display more suitable for portable applications.
3Illumination intensity
If multiple layers are stacked to suppress external light reflection, then visibility is improved, but device complexity and defect risk increase
Solution Approach 1:
The patent employs a simple composite structure of only two material types (metal film and dielectric film) to achieve external light reflection suppression, avoiding the complexity of multiple stacked layers required by conventional polarizing plate solutions and reducing defect risk.
4Length of stationary object
If the overall thickness is reduced to improve flexibility, then flexibility is improved, but external light reflection increases
Solution Approach 1:
The optical unit with metal material film (having 40% or higher optical absorption rate) and dielectric material film provides effective external light reflection suppression in a thin structure, enabling the OLED display to maintain both flexibility and anti-reflection performance.
Solution Approach 2:
By carefully selecting and optimizing the optical parameters (absorption rate, refractive index) of the metal and dielectric materials, the patent achieves effective reflection suppression without increasing thickness, maintaining the flexibility advantage of thin OLED displays.
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 contrast and visibility without a polarizing plate, maintaining transmittance and efficiency comparable to polarizing plate-equipped displays, while reducing overall thickness and enhancing flexibility, thus addressing the limitations of existing OLED displays.
Implementation Method 1
The metal material film may have an optical absorption rate of about 40% or higher and a refractive index ranging from about 0.5 to about 7
Implementation Method 2
An optical unit on the display panel and including a metal material film and a dielectric material film
Data Source
AI summary
An organic light emitting diode (“OLED”) display includes a display panel; and a window on the display panel. The OLED display further includes an optical unit on the display panel, and including a metal material film and a dielectric material film.