Microcavity Display With Anisotropic Absorbing Layer for Tint Suppression
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Self light emitting display elements with a microcavity structure exhibit tint changes when viewed from oblique directions, affecting color consistency.
Innovation Solution
Incorporation of an anisotropic light absorbing layer containing a dichroic substance and liquid crystal compound with specific absorption properties, along with a microcavity structure, to stabilize color perception across various viewing angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a microcavity structure is used in a self light emitting display element, then brightness and color purity are improved, but tint changes occur when viewed from oblique directions
Solution Approach 1:
The patent applies local quality by introducing an anisotropic light absorbing layer with direction-dependent optical properties. This layer has different absorption characteristics for light coming from different directions, specifically absorbing blue light components more strongly from oblique directions to compensate for the microcavity's directional color shift. The anisotropic layer's absorption axis is oriented to counteract the wavelength shift observed at oblique viewing angles.
Solution Approach 2:
The patent utilizes color changes by employing a dichroic substance in the anisotropic light absorbing layer that exhibits different absorption spectra depending on the polarization direction and viewing angle. The dichroic substance is selected to have maximum absorption in the blue region (400-500 nm) and demonstrates angle-dependent absorption characteristics that compensate for the microcavity structure's oblique viewing color shift.
2Measurement precision
If a microcavity structure is used in a self light emitting display element, then color purity is improved, but tint is observed when viewed from oblique directions
Solution Approach 1:
The anisotropic light absorbing layer provides direction-specific optical compensation, with its absorption characteristics tailored to address the specific color purity issues that arise at oblique viewing angles while maintaining the microcavity's color purity benefits at normal incidence.
Solution Approach 2:
The patent employs composite materials by combining the microcavity structure with an anisotropic light absorbing layer containing dichroic substances and liquid crystal compounds. This composite structure integrates the wavelength-selective resonance of the microcavity with the direction-dependent absorption of the anisotropic layer to achieve both color purity and viewing angle independence.
3Stability of the object's composition
If an anisotropic light absorbing layer with dichroic substance is added, then tint observation is suppressed from oblique directions, but device complexity increases
Solution Approach 1:
The anisotropic light absorbing layer serves multiple functions simultaneously: it acts as a color compensation layer for oblique viewing, provides polarization control, and maintains broadband absorption across the visible spectrum. The dichroic substance within this layer performs both wavelength selection and angular compensation functions.
Solution Approach 2:
The anisotropic light absorbing layer is constructed as a composite material system combining dichroic substances, liquid crystal compounds, and polymer matrices. This composite structure achieves complex optical functionality through the synergistic interaction of its components, allowing color consistency improvement without proportionally increasing device complexity.
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 suppresses tint observation from both front and oblique directions, ensuring consistent white display regardless of viewing angle.
Implementation Method 1
anisotropic light absorbing layer
Implementation Method 2
dichroic substance
Implementation Method 3
the optical path length between upper and lower electrodes (that is, anode electrode and cathode electrode) of an organic material is matched to a peak wavelength of the spectrum of the light to be extracted, whereby only the light of a predetermined wavelength is resonated
Data Source
AI summary
The invention provides a display device in which the tint is difficult to observe in a case where white display is visually confirmed from a front direction, and the tint is also difficult to observe at any azimuthal angle in a case where white display is visually confirmed from an oblique direction. A display device of the invention includes, from a viewing side, an anisotropic light absorbing layer and a self light emitting display element which emits at least red light, green light, and blue light, the self light emitting display element has a microcavity structure, the anisotropic light absorbing layer is formed of a composition containing a dichroic substance and a liquid crystal compound, the dichroic substance has a maximum absorption wavelength of 400 to 500 nm, and the anisotropic light absorbing layer satisfies a requirement represented by Expression (1) and a requirement represented by Expression (2),1.50<Amax(60)/A(0) Expression (1)1.00≤Amax(60)/Amin(60)≤1.20 Expression (2).