OLED Display Bending Region Refractive Index Optimization
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Solution Overview
Problem
Curved screens with OLED displays face issues of inconsistent display brightness between bending and non-bending regions, affecting overall display effects.
Innovation Solution
A display panel design with a higher refractive index second functional layer in the bending region compared to the non-bending region, incorporating nanoparticles and varying hole sizes or protrusions to enhance light extraction and uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If OLED displays are used in curved screens, then the screens achieve small thickness, light weight, and low power consumption, but the display brightness in bending regions becomes inconsistent with non-bending regions
Solution Approach 1:
The patent applies local quality by differentiating the functional layer structure between bending and non-bending regions. Specifically, the bending region includes a first functional layer with light extraction structures (protrusions or holes), while the non-bending region has a second functional layer without such structures. This localized differentiation addresses the brightness inconsistency in bending regions without adding complexity to the entire display structure.
Solution Approach 2:
The display panel is segmented into distinct functional regions: a bending region with enhanced light extraction structures and a non-bending region with a standard functional layer. The pixel definition layer is divided into first pixel definition layers in bending regions and second pixel definition layers in non-bending regions, allowing optimized light extraction where needed while maintaining simplicity elsewhere.
2Illumination intensity
If the pixel definition layer thickness is increased in bending regions, then light extraction is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent employs parameter changes by varying the thickness of the pixel definition layer in bending regions compared to non-bending regions. The first pixel definition layers in bending regions have greater thickness to enhance light extraction, while the second pixel definition layers in non-bending regions maintain standard thickness. This parameter differentiation optimizes light extraction in critical areas without uniformly increasing complexity across the entire display.
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 design improves light output uniformity across both regions, ensuring consistent brightness and enhanced display effects for curved screens.
Implementation Method 1
a refractive index of the second functional layer is greater than a refractive index of the first functional layer
Implementation Method 2
the second functional layer comprises nanoparticles having a predetermined concentration
Data Source
AI summary
A display panel and a display device are provided. The display panel includes a bending region and a non-bending region, and the bending region is distributed on a periphery of the non-bending region. The display panel further includes a first functional layer and a second functional layer disposed on a first encapsulation layer. The second functional layer is disposed in the bending region. A refractive index of the second functional layer is greater than a refractive index of the first functional layer. An embodiment of the present invention improves display effects of the display panel.