Optical Display Module Retardation Layer Configuration
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Solution Overview
Problem
Existing liquid crystal display technologies face challenges in achieving wide viewing angles, productivity, processability, and economic feasibility, particularly in large displays, due to issues like curl generation and complex processes in forming uniform retardation layers.
Innovation Solution
An optical display module is designed with a first polarizer and two retardation layers, where the second retardation layer is placed inside the panel, and both retardation layers have specific biaxiality degrees and tilt angles to optimize viewing angles and simplify manufacturing processes, reducing curl formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If a coating type retardation layer is used, then the thickness of the polarizing plate is reduced, but it is very difficult to form a uniform retardation layer on a broad polarizing plate and requires complicated processes
Solution Approach 1:
The patent extracts the retardation function from the polarizing plate structure by placing the second retardation layer inside the optical display panel, separate from the polarizer. This allows the polarizing plate to be manufactured independently with simpler processes, while the retardation function is integrated into the display panel structure.
Solution Approach 2:
The patent segments the optical display system into distinct functional components: the polarizing plate (with first polarizer and first retardation layer) and the optical display panel (with second retardation layer). This segmentation allows each component to be manufactured and processed independently, simplifying the overall manufacturing process.
2Adaptability or versatility
If two retardation layers are used in the polarizing plate to realize broad viewing angle, then wide viewing angle is achieved, but curls are generated due to structural asymmetry and foreign matter is introduced upon assembly
Solution Approach 1:
The patent extracts the second retardation layer from the polarizing plate structure and places it inside the optical display panel. This extraction eliminates the structural asymmetry that causes curling in the polarizing plate, while the second retardation layer continues to provide wide viewing angle compensation from its new position within the panel.
Solution Approach 2:
The patent converts the potential harm of curling and foreign matter introduction during assembly into a benefit by repositioning the second retardation layer inside the panel. This eliminates the assembly issues while maintaining the wide viewing angle function, effectively turning a problematic configuration into a reliable one.
3Ease of manufacture
If a film type retardation layer is used, then processability is improved through roll-to-roll process, but curls are generated due to structural asymmetry
Solution Approach 1:
The patent extracts the second retardation layer from the polarizing plate assembly and integrates it into the optical display panel structure. This allows the polarizing plate to be processed through roll-to-roll without the asymmetry-induced curling, while the second retardation layer provides its function from within the panel.
Solution Approach 2:
The patent changes the spatial dimension of the second retardation layer from being part of the polarizing plate stack to being integrated within the optical display panel. This dimensional repositioning eliminates the structural asymmetry that causes curling while maintaining the retardation function.
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 enhances productivity, economic feasibility, and screen quality on ultra-large screens while minimizing curl generation and improving viewing angles, allowing for efficient roll-to-roll processing and reduced thickness of polarizing plates.
Implementation Method 1
the second retardation layer includes a positive A retardation layer having a degree of biaxiality (NZ) of 0.9 to 1.1 at a wavelength of 550 nm; and the first retardation layer includes a positive B retardation layer having a degree of biaxiality (NZ) of −1 to −0.2 at a wavelength of 550 nm
Implementation Method 2
a slow axis of the first retardation layer is tilted at an angle of −5° to +5° with respect to a light absorption axis of the first polarizer; a slow axis of the second retardation layer is tilted at an angle of −5° to +5° with respect to the light absorption axis of the first polarizer
Data Source
AI summary
Provided are an optical display device module and an optical display device comprising same, the module comprising: an optical display device panel; and a first polarizer, a first retardation layer, and a second retardation layer that are sequentially stacked, wherein the second retardation layer is disposed inside the panel for the optical display device, the slow axis of the first retardation layer forms −5° to +5° with respect to the absorption axis of the first polarizer, the slow axis of the second retardation layer forms −5° to +5° with respect to the absorption axis of the first polarizer, the second retardation layer includes a positive A retardation layer of which the biaxial degree is 0.9 to 1.1 at a wavelength of 550 nm, and the first retardation layer includes a positive B retardation layer of which the biaxial degree is −1 to −0.2 at a wavelength of 550 nm.