Circular Polarizer Layout for Higher Light Extraction in Electronic Displays
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Solution Overview
Problem
Existing electronic devices suffer from poor light extraction efficiency due to the arrangement of a circular polarizer affecting light emission, which also increases light reflection by the circuit layer.
Innovation Solution
The electronic device incorporates a circular polarizer with a functional region overlapping the substrate area not covered by electronic units and a redundant region overlapping the units, utilizing a phase retardation film and linear polarizing film to minimize light reflection and enhance extraction efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a circular polarizer is attached onto the outer surface of the substrate to reduce light reflection by the circuit layer, then light reflection is reduced, but light extraction efficiency deteriorates due to the arrangement of the circular polarizer affecting light emission
Solution Approach 1:
The linear polarizing film is divided into a functional region and a redundant region. The functional region is positioned to overlap with the area not covered by electronic units, while the redundant region overlaps with the electronic units. This segmentation allows the polarizer to reduce light reflection from the circuit layer while minimizing interference with light emission from the electronic units, thereby resolving the contradiction between reducing reflection and maintaining light extraction efficiency.
2Object-affected harmful factors
If the circular polarizer is arranged to cover the entire surface, then light reflection is reduced uniformly, but light extraction efficiency from electronic units deteriorates
Solution Approach 1:
Different regions of the linear polarizing film are assigned different functions: the functional region provides polarization protection for areas not covered by electronic units, while the redundant region is positioned over the electronic units to minimize interference. This local differentiation allows the system to achieve light reflection reduction where needed while preserving light extraction efficiency from the electronic units.
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 while reducing light reflection by the circuit layer, enhancing overall performance of the electronic device.
Implementation Method 1
The circular polarizer includes a phase retardation film and a linear polarizing film disposed on the phase retardation film
Implementation Method 2
The circular polarizer includes a phase retardation film and a linear polarizing film disposed on the phase retardation film
Data Source
AI summary
An electronic device of the disclosure includes a first substrate, a circuit layer, a plurality of electronic units, and a circular polarizer. The first substrate has a first surface. The circuit layer is disposed on the first surface. The plurality of electronic units are disposed on the first surface and electrically connected to the circuit layer. The circular polarizer includes a phase retardation film and a linear polarizing film disposed on the phase retardation film, and the linear polarizing film includes a functional region and a redundant region. In a normal direction of the first surface, the redundant region is overlapped with the plurality of electronic units, and the functional region is overlapped with an area of the first substrate not covered by the plurality of electronic units.