Organic Light-Emitting Apparatus Prism and Light-Absorbing Member
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Solution Overview
Problem
Conventional organic light-emitting apparatuses with prism sheets struggle to display high-definition images due to insufficient reduction of ambient light reflection and low light-extraction efficiency, which limits the luminance and image quality.
Innovation Solution
An organic light-emitting apparatus is designed with a prism member on the light extraction surface and a light-absorbing member positioned around the prism member, effectively reducing ambient light reflection and enhancing light extraction efficiency by utilizing a prism member with protrusions and a light-absorbing member to manage light incidence and emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a prism sheet is provided on the organic EL panel to improve luminance, then light extraction efficiency is improved, but ambient light reflection is not sufficiently reduced
Solution Approach 1:
The invention divides the light management function into two separate components: a prism sheet for light extraction enhancement and a black matrix for reflection suppression. This segmentation allows each component to optimize its specific function without compromising the other, resolving the contradiction between improving light extraction and reducing ambient light reflection.
Solution Approach 2:
The black matrix is selectively positioned in specific locations (between pixels and around prism protrusions) where ambient light reflection occurs, rather than covering the entire surface. This local application maintains light extraction efficiency in pixel areas while suppressing reflection in non-pixel areas, resolving the contradiction between the two opposing requirements.
2Object-affected harmful factors
If a circularly polarizing plate is used to suppress ambient light reflection, then reflection is reduced, but light extraction efficiency and luminance are not sufficiently improved
Solution Approach 1:
The invention replaces the circularly polarizing plate with a segmented structure consisting of a prism sheet and a black matrix. The prism sheet handles light extraction enhancement while the black matrix handles reflection suppression, achieving both goals simultaneously without the trade-off inherent in using a circularly polarizing plate.
Solution Approach 2:
The invention converts the harmful effect of ambient light reflection into a beneficial structure by using the black matrix to absorb reflected light in non-pixel areas. This approach transforms the problem of ambient light reflection into an opportunity to enhance contrast and image quality without compromising light extraction from the pixels.
3Productivity
If the light extraction surface is made uneven to improve luminance, then light extraction efficiency increases to 30-35%, but device complexity increases
Solution Approach 1:
The invention segments the light extraction function into a separate prism sheet component rather than making the entire device structure complex. This allows the organic EL panel itself to remain relatively simple while achieving enhanced light extraction through the added prism sheet layer.
Solution Approach 2:
The prism sheet acts as an intermediary component between the organic EL panel and the external environment. It provides the uneven light extraction surface needed for improved luminance while keeping the panel structure itself relatively simple, resolving the contradiction between performance enhancement and structural 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 significantly reduces ambient light reflection and improves light extraction efficiency from 20% to 30-35%, enhancing the luminance and image quality of the organic light-emitting apparatus.
Implementation Method 1
a prism member disposed on a light extraction side of the organic light-emitting device
Implementation Method 2
a light-absorbing member formed between the plurality of organic light-emitting devices, around the prism member
Data Source
AI summary
There is provided an organic light-emitting apparatus in which the luminance can be improved, and, at the same time, the reflection of ambient light can be reduced by adding a prism member and a light-absorbing member to a spontaneous light-emitting device such as an organic light-emitting device, and which includes: a plurality of organic light-emitting devices each having a pair of electrodes and an organic compound layer formed between the pair of electrodes; a prism member disposed on a light extraction side of the organic light-emitting device, an interface on the light extraction side of the prism member being an interface with air; and a light-absorbing member formed between the plurality of organic light-emitting devices, around the prism member, and on a side portion of a protrusion of the prism member.