Optical Compensation Layer for Display Color Shift and Reflection
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Solution Overview
Problem
The existing display device does not adequately compensate for optical characteristics such as external light reflection and color changes when viewed from different directions, leading to insufficient hue compensation.
Innovation Solution
A display device configuration that includes a light-emitting element layer with a first and second electrode, and an optical compensation layer above it, utilizing a liquid crystal layer with dichroic pigments to reduce external light reflection and compensate for color changes due to varying viewing angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If dichroic pigment is used to compensate for hue change due to different viewing directions, then color consistency is improved, but external light reflection is not sufficiently compensated
Solution Approach 1:
The optical compensation function is divided into two separate layers: the liquid crystal layer handles hue compensation through dichroic pigments, while the optical compensation layer (with positive and negative retardation films) specifically addresses external light reflection. This segmentation allows each layer to optimize its specific function without compromising the other.
Solution Approach 2:
The optical compensation layer combines multiple materials with different optical properties (positive retardation film and negative retardation film) to achieve comprehensive optical compensation. This composite structure enables simultaneous compensation for both external light reflection and color shift that cannot be achieved with a single material.
2Object-affected harmful factors
If optical compensation layer is added to compensate for external light reflection, then optical characteristics are improved, but device complexity increases
Solution Approach 1:
The optical compensation layer serves multiple functions simultaneously: it compensates for external light reflection, maintains color consistency across viewing angles, and works synergistically with the liquid crystal layer. This multi-functionality justifies the additional layer by providing comprehensive optical compensation in a single integrated component.
3Stability of the object's composition
If liquid crystal layer with dichroic pigment is used, then color level change is compensated, but manufacturing complexity increases
Solution Approach 1:
The patent specifies precise parameter ranges for the liquid crystal layer (thickness 50-200 nm, dichroic pigment concentration 0.1-5 wt%) and the optical compensation layer (retardation values and thickness ratios) to optimize color compensation while maintaining manufacturability. These parameter specifications provide clear manufacturing guidelines that balance performance requirements with production feasibility.
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 and color changes when viewed from different angles, enhancing display quality by maintaining consistent color levels and improving optical characteristics.
Implementation Method 1
a liquid crystal layer including dichroic pigments
Implementation Method 2
an optical compensation layer disposed above the light-emitting element layer, the optical compensation layer being configured to compensate for prevention of external light reflection
Data Source
AI summary
A display device, to provide compensation for change in color level due to different viewing directions of a display surface and compensation for other optical characteristics of the display surface in a compatible manner, includes a light-emitting element layer including a light-emitting layer including a light-emitting element, a first electrode disposed below the light-emitting layer, and a second electrode disposed above the light-emitting layer, wherein an optical compensation layer is disposed above the light-emitting element layer, the optical compensation layer being configured to compensate for prevention of external light reflection on a display surface and compensate for change in color level of the display surface due to different viewing directions of the display surface.