OLED Display External Light Reflection Suppression
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Solution Overview
Problem
OLED displays face issues with external light reflection, which deteriorates display performance and visibility, especially in bright settings, due to the reflection of ambient light by electrodes and metal wires, and existing solutions like polarizing and phase delay plates reduce light output, affecting visibility and power consumption.
Innovation Solution
The implementation of a dual brightness enhancement film (DBEF) with strategically positioned polarizing plates and phase delay plates, including ½ and ¼ wavelength plates, to suppress external light reflection while minimizing light loss, optimizing the angles of intersection between polarizing and light axes to enhance light transmission and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a polarizing plate and phase delay plate are used to suppress external light reflection, then visibility is improved, but light loss increases and power consumption increases
Solution Approach 1:
The optical compensation system is divided into multiple functional layers: a first polarizing plate, multiple phase delay plates (including 1/4 wavelength and 1/2 wavelength plates), and a second polarizing plate. Each layer performs a specific function in suppressing external light reflection while maintaining light transmission efficiency.
Solution Approach 2:
Different phase delay plates are positioned at specific locations between the polarizing plates with their light axes oriented at different angles. The first phase delay plate has its light axis at a first angle from the first polarizing plate's polarizing axis, while the second phase delay plate has its light axis at a second angle, creating localized optical properties that collectively suppress external light reflection while minimizing light loss.
2Object-affected harmful factors
If a polarizing plate and phase delay plate are used to suppress external light reflection, then visibility is improved, but device complexity increases
Solution Approach 1:
Multiple phase delay plates (1/4 wavelength plates and 1/2 wavelength plates) are combined between the two polarizing plates to achieve external light reflection suppression. This integrated structure accomplishes the optical compensation function through the synergistic effect of multiple components working together in a single assembly.
Solution Approach 2:
The optical compensation is achieved by introducing angular orientation of light axes in different phase delay plates rather than relying solely on sequential layering. By controlling the angles of the light axes relative to the polarizing axes, the system achieves effective external light reflection suppression through directional optical properties.
3Loss of energy
If multiple phase delay plates are used with specific angle orientations, then light transmission efficiency is improved, but manufacturing precision requirements increase
Solution Approach 1:
The system utilizes specific angular parameters for the light axes of the phase delay plates relative to the polarizing axes. By optimizing these angle parameters (first angle for the first phase delay plate, second angle for the second phase delay plate), the system achieves high light transmission efficiency while the parameter specifications provide clear manufacturing guidance.
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 effectively suppresses external light reflection, increases visibility, and reduces power consumption by minimizing light loss, with up to 80% of emitted light being efficiently transmitted, thereby extending the lifespan of the OLED display.
Implementation Method 1
a dual brightness enhancement film (DBEF) formed on the OLED, a first polarizing plate formed on the DBEF, a second polarizing plate formed on the first polarizing plate... The first polarizing plate and the DBEF may have the same polarizing axis. An angle of intersection between the polarizing axis of the first polarizing plate and a polarizing axis of the second polarizing plate may be about 45 degrees
Implementation Method 2
a plurality of phase delay plates formed between the first polarizing plate and the second polarizing plate... The first phase delay plate can be a 1⁄2 wavelength plate interposed between the first polarizing plate and the second polarizing plate. The second phase delay plate may be a 1⁄4 wavelength plate interposed between the first polarizing plate and the first phase delay plate
Data Source
AI summary
The present invention relates to an OLED display. In some embodiments, the OLED display may employ combinations of linear polarization, circular or elliptical polarization, and phase delay in order to suppress reflection from external light while minimizing the loss of emitted light from the OLED display. For example, the OLED in the display includes a stack having a first electrode, an organic emission layer, and a second electrode, a DBEF formed on the OLED, a first polarizing plate formed on the DBEF, a second polarizing plate formed on the first polarizing plate, and a plurality of phase delay plates formed between the first polarizing plate and the second polarizing plate.