OLED Circular Polarizing Plate Oblique Liquid Crystal Tilt
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Solution Overview
Problem
Organic light emitting diode (OLED) devices suffer from reduced display quality due to external light reflection, which affects visibility and contrast ratio.
Innovation Solution
A circular polarizing plate with a liquid crystal layer that tilts obliquely, where the tilt angles increase from one surface to the other, is applied to the OLED device, optimizing the tilt angles to minimize reflectance and color shift, and the refractive indices are adjusted to enhance anti-reflection effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a circular polarizing plate is attached to reduce external light reflection, then anti-reflection effect is improved, but device complexity increases
Solution Approach 1:
The patent combines the polarizer and compensation film into a single circular polarizing plate assembly that is integrated with the OLED display panel. The liquid crystal layer is embedded within the compensation film structure, merging multiple functional layers into one unified component that reduces external light reflection while maintaining manageable device complexity.
Solution Approach 2:
The circular polarizing plate acts as an intermediary layer between the external environment and the OLED display panel. It includes a polarizer layer and a compensation film with liquid crystal layer that work together to convert linearly polarized light into circularly polarized light, thereby reducing the harmful reflection effect on display quality.
2Object-affected harmful factors
If liquid crystal tilt angles are optimized to minimize reflectance, then anti-reflection effect is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent optimizes the tilt angle parameter of the liquid crystal molecules within the compensation film to achieve minimal reflectance. By carefully controlling the tilt angle distribution of the liquid crystal molecules, the circular polarizing plate effectively reduces external light reflection while maintaining color purity, balancing performance improvement with manufacturability.
3Reliability
If liquid crystal tilt angles are adjusted to minimize color shift, then color purity is improved, but device complexity increases
Solution Approach 1:
The patent applies local quality optimization by creating a specific tilt angle distribution within the liquid crystal layer of the compensation film. The liquid crystal molecules are arranged with varying tilt angles at different positions and depths within the layer, allowing precise control over color characteristics and minimal color shift while maintaining overall structural simplicity.
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 solution effectively reduces external light reflection, improving the display characteristics of OLED devices by enhancing visibility and maintaining color purity, as demonstrated by reduced reflectance and color shift measurements.
Implementation Method 1
A metal electrode and a metal wire of an organic light emitting diode (OLED) device may reflect external light, and a visibility and a contrast ratio thereof may be deteriorated by reflection of the exterior light
Implementation Method 2
the liquid crystal layer includes a plurality of liquid crystals that tilt obliquely with respect to an extension direction of the first and second surfaces of the liquid crystal layer
Implementation Method 3
The circular polarizing plate may reduce reflected light from leaking outside and thus realize an anti-reflection effect
Data Source
AI summary
An organic light emitting diode device includes an organic light emitting display panel and a circular polarizing plate which includes a polarizer and a compensation film including a liquid crystal layer which includes a first surface and a second surface, and liquid crystals that tilt obliquely with respect to an extension direction of the first and second surfaces of the liquid crystal layer where tilt angles of the liquid crystals with respect to the extension direction of the liquid crystal layer become gradually larger from the first surface to the second surface of the liquid crystal layer in a thickness direction of the liquid crystal layer, and a maximum tilt angle of the liquid crystals with respect to the extension direction of the liquid crystal layer is determined based on a thickness direction phase delay generated in a thickness direction of the organic light emitting display panel.