Refraction Control Layer for OLED Light Leakage
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Solution Overview
Problem
Existing electronic apparatuses with organic light emitting display panels face challenges in maintaining reliability due to light leakage and color mixing issues, which affect the viewing angle and color reproduction characteristics.
Innovation Solution
The integration of a refraction control layer with alternating first and second refraction patterns of different shapes and refractive indices between the display panel and the cover panel, along with a light-blocking layer and color filter layers, helps to reduce light leakage and color mixing, enhancing the viewing angle and color reproduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional organic light emitting display panel is used, then the display can be activated with electrical signals and display images, but light leakage and color mixing occur affecting viewing angle and color reproduction
Solution Approach 1:
The patent introduces a refraction control layer as an intermediary component between the display panel and the external environment. This layer contains refraction control patterns that act as mediators to redirect leaked light, preventing it from reaching adjacent pixel regions and causing color mixing. The intermediary layer thus resolves the contradiction by blocking the harmful light paths while maintaining display functionality.
Solution Approach 2:
The refraction control patterns are selectively positioned in specific regions where light leakage is most problematic, particularly around the peripheral region of the active area. By applying refraction control locally rather than uniformly across the entire display, the patent addresses color mixing issues at critical locations while maintaining overall display performance and minimizing additional complexity.
2Manufacturing precision
If light-blocking layers and color filter layers are added to reduce light leakage, then color reproduction improves, but device complexity increases
Solution Approach 1:
The refraction control layer is designed to perform multiple functions simultaneously: it controls light refraction to prevent leakage, maintains structural integrity of the display panel, and works in conjunction with existing color filter layers. By making this single layer multi-functional, the patent improves color reproduction without proportionally increasing device complexity, as the same structural element serves multiple purposes.
Solution Approach 2:
The patent employs a composite structure combining the refraction control layer with the existing display panel architecture, including color filter layers and encapsulation layers. This composite approach allows the system to leverage the optical properties of different materials working together - the refraction control patterns for light redirection and the color filters for wavelength selection - achieving improved color reproduction through material composition rather than adding separate complex subsystems.
3Productivity
If the display panel operates without refraction control, then device simplicity is maintained, but light-emitting efficiency and lifespan are reduced
Solution Approach 1:
The refraction control layer is divided into multiple refraction control patterns distributed across different regions of the display panel. Each pattern independently controls light refraction in its local area, particularly focusing on peripheral regions where leakage is most common. This segmentation allows the system to achieve improved light-emitting efficiency through targeted control rather than requiring a uniform complex structure across the entire display, thus balancing productivity improvement with manageable device 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
This configuration improves the light-emitting efficiency, lifespan, and color purity of the display panel, while preventing light from being refracted into adjacent regions, thus enhancing the overall reliability and optical performance of the electronic apparatus.
Implementation Method 1
a refraction control layer with alternating first and second refraction patterns of different shapes and refractive indices between the display panel and the cover panel
Data Source
AI summary
An electronic apparatus includes a display panel including a base substrate, a pixel definition layer to define openings, light-emitting devices including light-emitting patterns in the openings, and an encapsulation layer covering the light-emitting device, a cover panel including a window layer, a color filter layer, and a color control layer, the color filter layer being on the window layer, the color control layer being on the color filter layer and including a quantum dot, and a refraction control layer including first refraction patterns, overlapping the light-emitting patterns, respectively, and having a first refractive index, and a second refraction pattern adjacent to the first refraction patterns and having a second refractive index that is lower than the first refractive index, wherein, when measured in a first direction, a largest width of each of the first refraction patterns is larger than a width of each of the light-emitting patterns.