Transparent Insulation Layer Optical Patterns for OLED Light Output
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Solution Overview
Problem
Organic light emitting diode (OLED) display devices face inefficiencies in light output due to total reflection phenomena caused by reflectance differences between layers, leading to light leakage in lateral directions rather than perpendicular output.
Innovation Solution
Incorporating a transparent insulation layer with optical patterns on a substrate having a color filter layer, where the optical patterns are arranged in shapes of regular polygons, to refract light and enhance perpendicular output efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light is emitted from the organic light emitting element, then light must pass through multiple layers to reach the exterior, but total reflection occurs due to reflectance differences between layers causing light to leak in lateral directions
Solution Approach 1:
A transparent insulation layer with optical patterns (convex or concave shapes) is introduced as an intermediary component between the color filter layer and the exterior. This layer acts as a mediator to control light propagation, reducing total reflection at layer interfaces and directing light output in the perpendicular direction while minimizing lateral leakage.
Solution Approach 2:
The optical patterns in the transparent insulation layer change the physical parameters of light propagation by creating refractive index variations through convex or concave shapes. These geometric parameter changes modify the light path, reducing total internal reflection and enhancing perpendicular light output efficiency.
2Productivity
If a transparent insulation layer with optical patterns is added to enhance perpendicular light output, then light leakage in lateral directions is reduced, but the device structure becomes more complex
Solution Approach 1:
The transparent insulation layer serves multiple functions simultaneously: it provides electrical insulation, controls optical patterns to reduce light leakage, and enhances perpendicular light output. By combining these functions in a single layer, the design avoids adding multiple separate components, thereby limiting the increase in device complexity.
Solution Approach 2:
The transparent insulation layer combines transparent insulating material with integrated optical patterns (convex or concave geometries) to create a composite structure that achieves both electrical insulation and optical control functions, reducing the need for additional separate layers or components.
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 effectively reduces light leakage in lateral directions and enhances light output efficiency in the perpendicular direction without the need for additional components, improving the overall performance of OLED display devices.
Implementation Method 1
optical patterns which are arranged in a shape of plural polygons... to refract light and enhance perpendicular output efficiency
Data Source
AI summary
A method of fabricating an organic light emitting diode display device, includes forming a thin film transistor on a first substrate, forming an organic light emitting element electrically connected to the thin film transistor, on the first substrate, forming a black matrix, in which openings are formed, on one surface of a second substrate opposite to the first substrate, forming a color filter layer in the openings, forming a transparent insulation layer having a first surface and a second surface opposing the first surface on the second substrate, with the first surface of the transparent insulating layer in direct contact with the color filter layer, forming a plurality of optical patterns at the second surface of the transparent insulation layer, and attaching the first substrate and the second substrate such that the second surface of the transparent insulating layer is closer to the thin film transistor than the first substrate.