Organic Light Emitting Diode Display Phase Control Member
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Solution Overview
Problem
Organic light emitting devices face challenges in achieving optimal color reproducibility and photoefficiency due to variations in optical constants with wavelength, leading to inefficiencies in light emission and viewing angle performance.
Innovation Solution
Incorporating a phase control member with varying optical constants opposite to those of the transflective member, made from materials like semiconductors, dielectric materials, or transparent conductive oxides, to compensate for wavelength-dependent phase shifts and enhance microcavity processes, thereby improving light emission characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If a transflective member is used in the organic light emitting device, then the device achieves self-emissive display with lower power consumption, but color reproducibility and photoefficiency deteriorate due to wavelength-dependent optical constant variations
Solution Approach 1:
A phase control member is introduced as an intermediary layer between the transflective member and the organic light emitting member. This mediator compensates for the wavelength-dependent phase shifts caused by the transflective member by having opposite optical constant variations, thereby improving color reproducibility without increasing power consumption
Solution Approach 2:
The patent changes the optical parameters of the system by introducing a phase control member with specifically engineered optical constants that vary oppositely with wavelength compared to the transflective member. This parameter adjustment compensates for the detrimental wavelength-dependent phase shifts and improves photoefficiency and color accuracy
2Device complexity
If the optical constant of the transflective member varies with wavelength, then the device structure is simplified, but phase shifts cause deterioration in light emission characteristics and viewing angle performance
Solution Approach 1:
The phase control member serves as an optical intermediary that corrects the phase shifts introduced by the transflective member. By positioning this mediator in the optical path and engineering its optical constants to vary oppositely with wavelength, the system maintains structural simplicity while improving light emission characteristics and viewing angle performance
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 enhances color reproducibility and photoefficiency by aligning light peaks with the microcavity process spectrum, reducing color shifts with viewing angle and improving overall display performance.
Implementation Method 1
a changing characteristic according to wavelength of an optical constant of the phase control member varies in opposition to a changing characteristic according to wavelength of an optical constant of the transflective member
Implementation Method 2
One of the two electrodes injects holes and the other injects electrons into the light emitting layer. The injected electrons and holes combine to generate excitons. The excitons emit light while discharging energy.
Data Source
AI summary
An organic light emitting device according to an embodiment comprises: a substrate; a transflective member disposed on the substrate; a phase control member disposed on or under the transflective member; an organic light emitting member disposed on the phase control member; and a common electrode disposed on the organic light emitting member. A changing characteristic according to wavelength of an optical constant of the phase control member is opposite to a changing characteristic according to wavelength of an optical constant of the transflective member.