Display Polarizer Stack for Low-Reflection Color Accuracy
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Solution Overview
Problem
Light emitting display devices struggle with external light reflection, which affects their omnidirectional reflection characteristics and reflection color characteristics.
Innovation Solution
The integration of a polarizer and a compensation film with negative wavelength dispersion characteristics, achieved by merging layers with positive dispersion, to enhance reflection control and color accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a polarizer is added to the light emitting display device, then external light reflection is reduced, but device complexity increases
Solution Approach 1:
The patent combines the polarizer with compensation films (positive C plate, positive A plate, negative A plate) to form an integrated optical layer. This merging approach reduces the number of separate components while achieving both reflection reduction and wavelength dispersion control, thereby addressing the complexity issue while maintaining the benefit of reduced external light reflection.
Solution Approach 2:
The patent uses composite optical structures consisting of multiple compensation films with different wavelength dispersion characteristics combined with a polarizer. This composite approach enables sophisticated control of reflection properties and color characteristics without requiring a single complex component, thus managing device complexity while improving optical performance.
2Reliability
If multiple compensation films with positive dispersion are merged, then negative wavelength dispersion characteristics are achieved, but manufacturing precision requirements increase
Solution Approach 1:
The patent achieves negative wavelength dispersion by carefully selecting and combining compensation films with specific positive dispersion parameters. By controlling the retardation values and optical axes of individual layers (positive C plate with -50nm to -85nm thickness direction retardation, positive A plate with 160nm to 180nm in-plane retardation, negative A plate with -160nm to -180nm in-plane retardation), the overall negative dispersion characteristic is obtained while managing manufacturing tolerances.
Solution Approach 2:
The patent assigns different local optical properties to different layers within the compensation film structure. Each layer (positive C plate, positive A plate, negative A plate) has specifically tailored retardation characteristics and orientation angles that contribute to the overall negative wavelength dispersion. This local optimization approach enables precise control of the cumulative optical effect while allowing each layer to be manufactured within reasonable precision limits.
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 significantly reduces external light reflectance to 10% or less, while improving omnidirectional reflection characteristics and maintaining reflection color accuracy.
Implementation Method 1
the polarizer includes a polarizing layer having an absorption axis
Implementation Method 2
the positive C plate, the positive A plate, and the negative A plate are formed by arranging liquid crystal molecules
Implementation Method 3
the positive C plate has a thickness direction retardation value in a range of about −50 nm to about −85 nm, wherein the positive A plate has a front retardation value and the negative A plate has a front retardation value in the range of about −160 nm or more and about −180 nm or less
Data Source
AI summary
A light emitting display device includes a display panel including a light emitting diode, a positive C plate disposed in front of the display panel, a positive A plate disposed in front of the positive C plate, a negative A plate disposed in front of the positive A plate, and a polarizer disposed in front of the negative A plate, wherein the polarizer includes, a polarizing layer having an absorption axis, and a negative C plate disposed between the polarizing layer and the negative A plate, wherein the positive C plate, the positive A plate, the negative A plate, and the negative C plate each have positive wavelength dispersion characteristics, and wherein the light emitting display device has negative wavelength dispersion characteristics at the front as a whole.