Curved OLED Lens Structure for White Angle Difference
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Solution Overview
Problem
Flexible OLED displays with curved portions suffer from significant luminance deterioration and color coordinate changes when viewed from different angles, leading to poor white angle difference (WAD) characteristics due to light scattering and spread.
Innovation Solution
The OLED display incorporates a lens-shaped OLED structure at curved portions with a passivation layer having recess or convex portions, concentrating emitted light and minimizing luminance and color changes by forming pixel electrodes and organic emission layers in concave or convex lens shapes to enhance light concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a curved portion is formed in the flexible substrate to enable flexible display, then the adaptability and form factor are improved, but the white angle difference (WAD) characteristics deteriorate due to light scattering and luminance deterioration
Solution Approach 1:
The patent applies different structural configurations to different regions: flat portions maintain standard OLED structure while curved portions incorporate lens-shaped OLEDs with specific curvature radii (R1 for pixel electrode, R2 for common electrode where R2 > R1). This local differentiation resolves the WAD deterioration issue specifically at curved portions without affecting other regions.
Solution Approach 2:
The patent introduces lens-shaped structures with specific curvatures to counteract the curvature-induced light scattering. The pixel electrode has curvature radius R1 and the common electrode has curvature radius R2 (R2 > R1), creating a controlled optical path that compensates for the substrate curvature and improves WAD characteristics.
2Reliability
If the OLED structure is modified to lens shape to improve WAD characteristics, then the display quality is improved, but the device complexity increases
Solution Approach 1:
The complex lens-shaped structure is applied only to curved portions where WAD deterioration occurs, while flat portions maintain the simple standard OLED structure. This selective application minimizes overall device complexity while resolving the specific WAD issue.
3Illumination intensity
If lens-shaped OLEDs with different curvature radii are used to concentrate light, then luminance is improved and color coordinate changes are reduced, but the manufacturing precision requirements increase
Solution Approach 1:
The patent specifies precise curvature radius parameters (R1 for pixel electrode, R2 for common electrode with R2 > R1) to control light concentration. By optimizing these parameters, the patent achieves improved luminance and reduced color coordinate changes while maintaining manufacturability through defined parameter ranges.
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 enhances luminance and reduces color coordinate changes across viewing angles, thereby improving display characteristics in curved portions of flexible OLED displays.
Implementation Method 1
At least one OLED that is positioned at the curved portion of the plurality of OLEDs is formed in a lens shape
Data Source
AI summary
An organic light emitting diode (OLED) display is disclosed. In one aspect, the OLED display includes a flexible substrate and a plurality of OLEDs. The flexibility substrate includes at least one curved portion. The OLEDs are positioned in every pixel area that is set on the flexible substrate and includes a pixel electrode, an organic emission layer, and a common electrode. At least one OLED that is positioned at a curved portion in the OLEDs is formed in a lens shape and concentrates light toward the center of a pixel area.