OLED Sealant Light Scattering for Edge Illumination
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Solution Overview
Problem
The existing display device structure for lighting apparatuses results in light loss and dark areas at the edges due to the sealant formation, which affects light efficiency.
Innovation Solution
Incorporating light-scattering particles within the sealant and a light reflecting member to diffuse and reflect light, respectively, thereby extending the emission region and reducing light loss at the edges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a sealant is used to bond the first substrate and second substrate together, then the substrates are securely bonded, but dark areas are formed at the edges and light loss occurs
Solution Approach 1:
A light-scattering member is introduced as an intermediary component between the sealant and the second substrate. This member scatters light that would otherwise be blocked by the sealant, converting the harmful light-blocking effect into useful light diffusion while maintaining the sealant's bonding function.
Solution Approach 2:
The light-scattering member is selectively positioned only in regions where light loss occurs (edge regions near the sealant) rather than uniformly across the entire device. This localized application addresses the specific problem area without affecting other regions.
2Strength
If a sealant is used to bond the first substrate and second substrate together, then the substrates are securely bonded, but dark areas are formed at the edges
Solution Approach 1:
The light-scattering member acts as a mediator that intercepts light before it is completely blocked by the sealant, scattering it into the edge regions. This improves illumination intensity at the edges while preserving the sealant's bonding strength.
Solution Approach 2:
The sealant's light-blocking property, which initially creates dark areas, is converted into a beneficial effect by positioning the light-scattering member to scatter light into the previously dark edge regions, transforming the harmful shadow into useful illumination.
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 solution enhances light efficiency and reduces the formation of dark areas at the edges, providing more uniform light distribution.
Implementation Method 1
the sealant comprises first light-scattering particles which are dispersed in the sealant and configured to diffuse light incident to the sealant
Implementation Method 2
a light-scattering member which partially or wholly overlaps a non-emission region outside the emission region
Data Source
AI summary
A lighting apparatus and a lighting unit. The lighting apparatus includes: a first substrate; an organic light-emitting diode (OLED) which is disposed on the first substrate to define an emission region and emits light; a second substrate which faces the first substrate with the OLED interposed therebetween; and a sealant which is disposed between the first substrate and the second substrate, bonds the first substrate and the second substrate together, and surrounds the OLED at a set or predetermined distance from the OLED, wherein the sealant includes first light-scattering particles which are dispersed in the sealant and diffuse light incident to the sealant.