Array Substrate Correction Layer for Flexible Display Color Accuracy
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Solution Overview
Problem
Flexible display panels exhibit abnormal coloration in curved areas due to differential light attenuation of various wavelengths, with red light attenuating slower than green and blue, leading to display quality issues when viewed from the front.
Innovation Solution
An array substrate with a back plate featuring a light emitting layer divided into first and second light emitting units of different wavelengths, a pixel defining layer, and a correction layer made of magnesium or silver, positioned to absorb and reflect longer wavelength light, thereby accelerating its attenuation and correcting color distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a flexible display panel uses a curved area to achieve flexibility, then adaptability is improved, but color accuracy deteriorates due to differential light attenuation of different wavelengths
Solution Approach 1:
The patent applies local quality by introducing a correction layer with specific optical properties at the curved area of the display panel. This correction layer has different characteristics from the planar area, specifically designed to compensate for the wavelength-dependent light attenuation that occurs only in curved regions. The correction layer's refractive index and thickness are locally optimized to counteract the color distortion caused by curvature, thereby maintaining color accuracy specifically where needed without affecting the overall flexibility of the display panel.
2Illumination intensity
If light emitting units of different wavelengths are used to achieve full color display, then color richness is improved, but color uniformity deteriorates in curved areas due to differential attenuation
Solution Approach 1:
The patent applies parameter changes by modifying the optical parameters of the correction layer to compensate for wavelength-dependent attenuation. The correction layer is designed with specific refractive index and thickness parameters that vary to affect different wavelengths differently. By changing these optical parameters, the correction layer accelerates the attenuation of longer wavelength light (red) more than shorter wavelength light (blue), thereby restoring color uniformity across the curved display area while maintaining the full color capability provided by multiple light emitting units.
3Device complexity
If no correction layer is used to maintain simple structure, then device complexity is reduced, but color distortion occurs in curved areas
Solution Approach 1:
The patent introduces a correction layer as an intermediary element between the light emitting units and the viewer. This correction layer acts as a mediator that specifically addresses the color distortion problem in curved areas without requiring fundamental changes to the display panel's flexible structure. The correction layer is a relatively simple additional component that can be integrated into the existing display stack, providing color correction functionality with minimal increase in overall 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
The solution effectively accelerates the attenuation of longer wavelength light, improving display quality by minimizing color abnormalities in curved areas of flexible display panels.
Implementation Method 1
a correction layer at a side of the first pixel defining region away from the back plate for absorbing and reflecting the light emitted by the first light emitting unit
Implementation Method 2
a correction layer at a side of the first pixel defining region away from the back plate for absorbing and reflecting the light emitted by the first light emitting unit
Data Source
AI summary
An array substrate includes a back plate including planar and curved portions; a light emitting layer at the back plate including first and second light emitting units that are spaced apart from each other, and a wavelength of a light emitted by the first light emitting unit being greater than a wavelength of a light emitted by the second light emitting unit; a pixel defining layer at a first side of the back plate and between the first light emitting unit and the second light emitting unit, the pixel defining layer including a first pixel defining region on the curved portion and adjacent to the first light emitting unit and close to the planar portion; and a correction layer at a side of the first pixel defining region away from the back plate for absorbing and reflecting the light emitted by the first light emitting unit.