Organic Light Emitting Display Contrast and Impact Resistance
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Solution Overview
Problem
Organic light emitting display apparatuses face challenges with reduced contrast and visibility due to sunlight reflection and susceptibility to external impact, particularly with metal reflection films and fragile surfaces.
Innovation Solution
The solution involves an organic light emitting display apparatus design that includes a substrate with a buffer layer, a thin film transistor, a semi-transparent film, a passivation film, a transmissive black layer, and a black matrix layer, which together enhance contrast by reducing external light reflection and increase impact resistance through a combination of materials and structural elements like SiO2, SiNx, and thermosetting resins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a metal reflection film is used in the organic light emitting display apparatus, then brightness can be enhanced, but sunlight reflection increases causing reduced contrast and visibility
Solution Approach 1:
The patent applies composite materials by combining multiple layers with different optical properties: a semi-transparent film layer (51) with 30-70% transmittance, a passivation film layer (52) with lower refractive index, and a black matrix layer (22) with high light absorption. This composite structure reduces sunlight reflection and enhances contrast while maintaining adequate brightness, resolving the contradiction between brightness enhancement and sunlight reflection reduction.
2Weight of moving object
If the display apparatus is made thin and lightweight for portability, then mobility is improved, but impact resistance decreases making the surface easily damaged
Solution Approach 1:
The patent implements beforehand cushioning by incorporating a passivation film layer (52) made of thermosetting resin with high impact resistance on the outer surface of the sealing member. This protective layer acts as a cushion against external impacts before they can damage the fragile internal components, enabling the display to be made thin and lightweight while maintaining adequate impact resistance.
3Illumination intensity
If a semi-transparent film with high transmittance is used, then optical transmittance is improved, but impact resistance is reduced making the film more fragile
Solution Approach 1:
The patent resolves this contradiction by creating a composite structure where a semi-transparent film layer (51) with 30-70% transmittance is combined with a passivation film layer (52) made of thermosetting resin. The semi-transparent film provides the required optical transmittance, while the thermosetting resin layer provides high impact resistance, allowing the overall structure to maintain both optical performance and mechanical strength.
4Reliability
If multiple protective layers are added to increase impact resistance, then durability is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by designing the passivation film layer (52) to perform multiple functions simultaneously: it provides high impact resistance against external damage, serves as a protective barrier for the semi-transparent film layer, and maintains optical transparency. This multi-functional design enhances durability without significantly increasing device complexity, as a single layer achieves multiple protective objectives.
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
This design effectively increases contrast and impact resistance, maintaining optical transmittance while minimizing external light reflection and protecting the display from damage, thereby improving the performance and durability of organic light emitting display apparatuses.
Implementation Method 1
a passivation film layer (52) made of a transparent material having a refractive index lower than that of the semi-transparent film layer (51)
Implementation Method 2
a passivation film layer (52) made of a transparent material having a refractive index lower than that of the semi-transparent film layer (51) and having a high impact resistance
Implementation Method 3
a semi-transparent film layer (51) formed on an upper surface of the sealing member (50) facing the outside
Data Source
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AI summary
Provided is an organic light emitting display apparatus that can increase contrast of the organic light emitting display apparatus. The organic light emitting display apparatus includes; a substrate; an organic light emitting device disposed on the substrate to display an image; a sealing member formed on the organic light emitting device; a semitransparent film formed on an upper surface of the sealing member facing the outside to transmit a portion of external light and to reflect another portion of external light; a passivation film formed on the semitransparent film in order to protect the semitransparent film by covering the semitransparent film; and a transmissive black layer formed between the sealing member and the organic light emitting device in order to increase contrast, wherein the semitransparent film has a refractive index greater than that of the passivation film.