OLED Display Bent Substrate Color Accuracy
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Solution Overview
Problem
OLED displays with bent substrates experience inaccurate color reproduction due to the tilting of organic light-emitting elements, which changes the distance between electrodes and alters the wavelength of emitted light.
Innovation Solution
The OLED display features a bent substrate with central and peripheral areas, where OLEDs on the central area have specific thicknesses and are paired with OLEDs on the peripheral area, ensuring the distance between electrodes remains consistent, allowing for micro cavity effects that maintain accurate color emission even when tilted.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the substrate is bent to achieve flexible display, then adaptability is improved, but color reproduction accuracy deteriorates due to tilting of OLED elements
Solution Approach 1:
The patent applies local quality by creating different OLED structures in different regions of the bent substrate. Central OLEDs have a first thickness designed for normal emission, while peripheral OLEDs have a second thickness (greater than the first) to compensate for tilting effects. This regional differentiation maintains color accuracy across the entire bent display surface.
Solution Approach 2:
The patent changes the thickness parameter of the OLED emission layer based on position. By adjusting the thickness of the organic emission layer in peripheral regions compared to central regions, the optical path length is compensated for tilting angles, thereby maintaining consistent color reproduction across the bent substrate.
2Manufacturing precision
If the distance between electrodes is changed to adjust emission wavelength, then color tuning is improved, but device complexity increases due to multiple thickness variations
Solution Approach 1:
The patent segments the OLED display into central and peripheral regions with distinct thickness characteristics. This segmentation allows independent optimization of each region's emission properties while maintaining overall system functionality, managing complexity through regional categorization.
Solution Approach 2:
The patent introduces a spatial dimension to the solution by varying OLED thickness in the vertical direction based on radial position from the center. This dimensional approach (center vs. periphery) provides a systematic method for wavelength control without requiring complex lateral adjustments.
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 ensures that light emitted from OLEDs on bent substrates is recognized as a predetermined color, improving color reproduction accuracy and maintaining image quality.
Implementation Method 1
an organic light-emitting element disposed on the substrate and including a first electrode, a second electrode, and an organic emission layer disposed between the first electrode and the second electrode
Implementation Method 2
light emitted from an organic emission layer is reflected plural times between a first electrode and a second electrode to cause constructive interference corresponding to a set wavelength
Data Source
AI summary
An organic light emitting diode (OLED) display includes a substrate including a central area and a peripheral area adjacent the central area and bent at the center thereof, a first central OLED disposed on the central area of the bent substrate and including a first central organic emission layer having a first central thickness, and a first surrounding OLED disposed on the peripheral area of the bent substrate and including a first surrounding organic emission layer having a first surrounding thickness.