Transflective Organic Light Emitting Device Micro-Cavity Color Reproducibility
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Solution Overview
Problem
Organic light emitting devices face limitations in color reproducibility due to the limitations of color filters, making it difficult to achieve high color reproducibility as required by the National Television Systems Committee (NTSC) for white light emission.
Innovation Solution
An organic light emitting device with a substrate, thin film structure, color filters, transflective members, pixel electrodes, and a common electrode, where the thickness between the transflective members and the common electrode is in the range of 6100 Å to 6700 Å, and the transflective members include materials like silver, aluminum, or magnesium, forming a micro-cavity structure to enhance color reproducibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If color filters are used to obtain desired color from white light emission, then color selection is achieved, but color reproducibility deteriorates due to limitations in color filter performance
Solution Approach 1:
The patent changes the optical parameters of the device by introducing a micro-cavity structure with specific thickness (6100-6700 Å) between the transflective member and common electrode. This structural parameter change enables resonant enhancement of specific wavelengths, achieving high color reproducibility (exceeding NTSC standards) without relying on color filters, thereby resolving the contradiction between ease of color selection and color reproducibility
Solution Approach 2:
The patent extracts and removes the color filter component from the device structure. By eliminating color filters and using only the organic light emitting member to emit white light combined with a micro-cavity structure, the invention achieves high color reproducibility while simplifying the device structure, thus resolving the contradiction between color selection capability and color reproducibility
2Device complexity
If conventional structures with color filters are used, then device simplicity is maintained, but color reproducibility deteriorates and cannot meet NTSC standards
Solution Approach 1:
The patent introduces a specific structural parameter - a micro-cavity thickness of 6100-6700 Å between the transflective member and common electrode. This precise parameter control enables resonant enhancement of red, green, and blue wavelengths from white light emission, achieving color reproducibility exceeding NTSC standards while maintaining relatively simple device structure without color filters
Solution Approach 2:
The patent uses a composite structure combining transflective members (silver, aluminum, or magnesium) with dielectric layers (organic or inorganic materials like silicon oxide or silicon nitride) to create a micro-cavity resonator. This composite structure enables high color reproducibility through optical resonance while maintaining structural simplicity, resolving the contradiction between device simplicity and color reproducibility
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 proposed solution significantly improves color reproducibility, achieving high intensity in narrow wavelength ranges for red, green, and blue pixels, and overall color purity, exceeding NTSC standards with a color reproducibility of about 107.2%, compared to conventional structures.
Implementation Method 1
first, second, third, and fourth transflective members formed on the insulating layer, and respectively disposed in the first, second, third, and fourth regions... a thickness between an upper surface of the transflective member and a lower surface of the common electrode is in range of 6100 Å to about 6700 Å... forming a micro-cavity structure to enhance color reproducibility
Implementation Method 2
an organic light emitting member for emitting white light formed on the first to fourth pixel electrodes... the organic light emitting member emits light of three primary colors such as red, green, and blue
Data Source
AI summary
An organic light emitting device includes a substrate including a first region, a second region, a third region, and a fourth region, a thin film structure formed on the substrate, first, second, and third color filters formed on the thin film structure, and respectively disposed in the first, second, and third regions, an insulating layer formed on the first to third color filters and the thin film structure, first, second, third, and fourth translucent members formed on the insulating layer, and respectively disposed in the first, second, third, and fourth regions, first, second, third, and fourth pixel electrodes respectively formed on the first, second, third, and fourth translucent members, an organic light emitting member for emitting white light formed on the first to fourth pixel electrodes; and a common electrode formed on the organic light emitting member.