Scattering Structure for OLED External Light Reflection
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Solution Overview
Problem
Conventional organic light-emitting display devices suffer from deteriorated contrast and visibility due to external light reflection, particularly from sunlight and indoor fluorescent lights, and face challenges in manufacturing thin devices with complex and costly film-type polarizing plates.
Innovation Solution
The implementation of a scattering structure, comprising resin layers with scattering particles, is positioned between the substrates and pixels at a distance equal to or below the pixel pitch, along with a light-absorbing layer and black matrix, to reduce external light reflection and pixel blurring, while maintaining a thin form factor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a film type polarizing plate is adhered on the entire surface to prevent external light reflection, then visibility deteriorates due to external light, but device thickness increases and manufacturing complexity increases
Solution Approach 1:
The patent employs a scattering layer with porous or particulate structure (comprising scattering particles) that selectively scatters external light to reduce reflection. This porous/scattered structure achieves the anti-reflection function without requiring the thick film structure of conventional polarizing plates, thereby reducing device thickness while maintaining effectiveness against external light.
Solution Approach 2:
The patent changes the structural parameters by replacing a continuous film structure with a dispersed particle structure in a resin layer. This parameter change allows the scattering layer to achieve anti-reflection functionality with reduced thickness compared to film-type polarizing plates, resolving the contradiction between effectiveness and device thickness.
2Object-affected harmful factors
If a film type polarizing plate is adhered on the entire surface to prevent external light reflection, then visibility deteriorates due to external light, but manufacturing complexity and production cost increase
Solution Approach 1:
The patent merges the scattering function into the existing resin layer structure of the display device. Instead of adding a separate film-type polarizing plate as an additional component, the scattering particles are integrated into the resin layer, combining multiple functions (structural support and light scattering) into a single layer, thereby reducing manufacturing complexity.
Solution Approach 2:
The resin layer is designed to serve multiple functions: it provides structural support as part of the display device and simultaneously functions as a scattering layer to reduce external light reflection. This multi-functionality eliminates the need for separate polarizing plate components, simplifying manufacturing.
3Manufacturing precision
If a scattering structure is disposed at a distance below pixel pitch to reduce pixel blurring, then pixel blurring is reduced, but external light reflection suppression may be compromised
Solution Approach 1:
The patent applies local quality by positioning the scattering particles specifically within the resin layer at a controlled distance from the pixel structure. This localized arrangement ensures that scattering occurs at the optimal position to reduce pixel blurring while maintaining effectiveness against external light reflection, addressing both requirements simultaneously.
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 configuration effectively suppresses external light reflection and reduces pixel blurring, enhancing visibility and image clarity without the complexity and cost of traditional polarizing plates, while allowing for a thinner display device.
Implementation Method 1
a scattering structure disposed in a direction a light emitted from the organic light-emitting layer is extracted from the plurality of pixels
Implementation Method 2
a light absorbing layer disposed in the direction the light is extracted
Data Source
AI summary
An organic light-emitting display device, having a first substrate, a second substrate facing the first substrate, a plurality of pixels disposed between the first and second substrates comprising a first electrode, a second electrode, and an organic light-emitting layer disposed between the first and second electrodes, for suppressing external light reflection and reducing pixel blurring by disposing a scattering structure in a direction a light is extracted at a distance equal to or below an adjacent pixel pitch.