Dual Brightness Enhancement Film for OLED Light Efficiency
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Solution Overview
Problem
Dual-side emission OLED displays face poor light efficiency and increased light loss due to the use of conventional polarizing and phase retardation plates, which are ineffective in bright areas and lead to reduced contrast and black color expression.
Innovation Solution
Incorporating a dual brightness enhancement film (DBEF) with transflective electrodes made of transparent conductive materials and metals, and a polarizing plate aligned with the DBEF, to enhance light transmission and reflection, minimizing external light reflection and optimizing light emission direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional polarizing and phase delay plates are used in dual-side emission OLED display, then external light reflection is suppressed, but light generated from organic emission layer is lost or eliminated
Solution Approach 1:
The patent changes the optical parameters by using a dual brightness enhancement film with specific polarization properties instead of conventional phase delay plates. The DBEF has a polarization axis that allows it to pass light parallel to the axis while reflecting light not parallel with the axis, fundamentally changing how light interacts with the display structure.
Solution Approach 2:
The patent employs a composite structure combining the dual brightness enhancement film with transflective electrodes made of transparent conductive materials and metals. This composite approach creates a system that simultaneously achieves anti-reflection properties and high light transmission efficiency.
2Illumination intensity
If conventional polarizing and phase delay plates are used in dual-side emission OLED display, then black color expression and contrast are improved in bright areas, but light efficiency is reduced
Solution Approach 1:
The patent changes the polarization control mechanism by replacing phase delay plates with a dual brightness enhancement film that has distinct polarization passing and reflecting properties. This parameter change enables the system to maintain contrast performance while dramatically improving light efficiency.
Solution Approach 2:
Instead of using phase delay plates that eliminate certain polarizations, the patent inverts the approach by using a DBEF that actively passes desired polarizations and reflects unwanted ones. This inversion of the optical control strategy resolves the contradiction between contrast and light efficiency.
3Loss of energy
If dual brightness enhancement film is used on one side, then light efficiency is improved, but dual-side emission capability must be maintained
Solution Approach 1:
The patent segments the optical enhancement function by placing dual brightness enhancement films on both the front and rear sides of the OLED display. This segmentation allows each film to independently optimize light extraction in its respective direction while collectively maintaining dual-side emission capability.
Solution Approach 2:
The dual brightness enhancement film serves multiple functions: it enhances light extraction efficiency, maintains polarization control for contrast, and enables dual-side emission when configured on both sides of the display. This multi-functionality resolves the contradiction between improving light efficiency and maintaining emission versatility.
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
Improves light efficiency and visibility by maximizing luminance while reducing light loss and external light reflection, allowing for effective dual-side image display.
Implementation Method 1
the DBEF is configured to pass light parallel with a polarization axis and to reflect light not parallel with the polarization axis
Implementation Method 2
the organic light emitting diode emits light by way of energy generated when excitons (the excitons being combinations of electrons and holes) within an organic emission layer fall from an excited state to a ground state
Implementation Method 3
a first transflective electrode on the substrate main body; an organic emission layer on the first transflective electrode; a second transflective electrode on the organic emission layer
Data Source
AI summary
An OLED display including: a substrate main body; a first transflective electrode formed on the substrate main body; an organic emission layer formed on the first transflective electrode; a second transflective electrode formed on the organic emission layer; and a dual brightness enhancement film (DBEF) disposed on a dual brightness enhancement film (DBEF) on at least one of a side of the first transflective electrode facing away from the organic emission layer, or a side of the second transflective electrode facing away from the organic emission layer.