Multilayered Optical Film for Display Visibility
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Solution Overview
Problem
Flat panel displays, particularly emitting and non-emitting types like OLED and LCD, face issues with external light reflection leading to decreased visibility and contrast ratio due to metal electrodes, which existing optical compensation films fail to adequately address, and bezels contribute to thickness and aesthetic concerns.
Innovation Solution
An optical film comprising a polarization layer, first and second phase retardation layers, and a light blocking layer, with specific retardation values and orientations, combined with an adhesive layer, is used to convert linear polarization to circular polarization, reducing light leakage and bezel thickness through a roll-to-roll manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a polarizing plate and phase difference film are used to prevent external light reflection, then visibility and contrast ratio are improved, but the device structure becomes more complex and thickness increases
Solution Approach 1:
The patent combines multiple optical functions (polarization, phase retardation, and light blocking) into a single integrated optical film structure. The optical film includes a polarizing plate with first and second phase difference films laminated on its outer surface, and a light blocking layer extending along the circumference, eliminating the need for separate optical compensation films and light blocking frames.
Solution Approach 2:
The optical film performs multiple functions simultaneously: the polarizing plate converts light polarization, the phase difference films adjust polarization states, and the light blocking layer prevents external light reflection. This multi-functional design improves visibility and contrast ratio while reducing overall device complexity compared to using separate components.
2Object-affected harmful factors
If bezel is added to cover periphery of screen, then light blocking is improved, but display device thickness increases and aesthetics deteriorate
Solution Approach 1:
The patent extracts the light blocking function from the traditional bezel structure and integrates it into the optical film itself. The light blocking layer is formed on the outer surface of the optical film, extending along the circumference in a band shape, thereby eliminating the need for separate light blocking frames or thick bezels while maintaining effective light reflection prevention.
Solution Approach 2:
The light blocking function is achieved through a thin light blocking layer integrated into the optical film structure, rather than using a thick rigid bezel. This thin-film approach maintains display device thickness while providing effective light blocking, and the band shape extending along the circumference provides aesthetic advantages.
3Reliability
If multiple optical layers are laminated to convert linear polarization to circular polarization, then light leakage is reduced, but manufacturing complexity increases
Solution Approach 1:
The patent combines the polarizing plate and phase difference films into a single laminated optical film structure that can be applied as one unit to the display device. This integration simplifies the manufacturing process compared to separately assembling multiple optical components, while maintaining the optical performance needed to prevent light leakage.
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 optical film effectively reduces external light reflection and maintains thinness, enhancing image quality and visibility in displays by converting light polarization and eliminating the need for separate light blocking frames, thereby improving display performance and aesthetics.
Implementation Method 1
a first phase retardation layer; a second phase retardation layer... an in-plane retardation value of the first phase retardation layer at a standard wavelength of about 550 nanometers is in a range from about 240 nanometers to about 300 nanometers, and an in-plane retardation value of the second phase retardation layer at the standard wavelength is in a range from about 110 nanometers to about 160 nanometers
Data Source
AI summary
An embodiment of an optical film includes: a polarization layer; a first phase retardation layer; a second phase retardation layer; and a light blocking layer disposed between the first phase retardation layer and the second phase retardation layer and extending along a circumference of the second phase retardation layer, wherein the polarization layer is disposed on the first phase retardation, the first phase retardation layer is disposed on the second phase retardation layer, an in-plane retardation value of the first phase retardation layer at a standard wavelength of about 550 nanometers is in a range from about 240 nanometers to about 300 nanometers, and an in-plane retardation value of the second phase retardation layer at the standard wavelength is in a range from about 110 nanometers to about 160 nanometers.