Asymmetric Lens Layer for OLED Display Brightness Uniformity
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Solution Overview
Problem
Existing organic electroluminescence (EL) display devices face challenges in improving visual field angle characteristics and radiation angle due to differences in pixel electrode areas and sizes, leading to uneven brightness and color distribution.
Innovation Solution
The display device incorporates a substrate with a lens layer and pixel electrodes of varying sizes, where the area of the first pixel electrode is greater than the second, and the corresponding lenses also vary in size, enhancing the radiation angle by refracting light efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If pixel electrodes of different areas are used to achieve predetermined color balance, then color balance is improved, but visual field angle characteristic and radiation angle deteriorate
Solution Approach 1:
The patent applies local quality by making each lens have a different area corresponding to its associated pixel electrode. The lens area is specifically tailored to match the pixel electrode area, creating a localized optical correction that compensates for the uneven light emission from pixels of different sizes, thereby improving visual field angle characteristic while maintaining color balance
Solution Approach 2:
The patent employs asymmetry by designing lenses with different areas rather than uniform lenses. This asymmetric lens configuration corresponds to the asymmetric pixel electrode areas, allowing each lens to optimally control and distribute light from its associated pixel, thus improving radiation angle and visual field angle characteristic
2Illumination intensity
If pixel electrodes of different areas are used, then color balance is achieved, but brightness uniformity deteriorates
Solution Approach 1:
The patent applies local quality by matching each lens area to its corresponding pixel electrode area. This localized correspondence ensures that light from larger pixels is properly distributed to match the brightness output from smaller pixels, achieving uniform overall brightness while maintaining the necessary color balance through different pixel areas
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 the visual field angle characteristic, reduces brightness and color unevenness, and extends the viewing range without compromising image quality, while also potentially increasing the lifespan of organic EL elements by minimizing differences in drive current.
Implementation Method 1
enhancing the radiation angle by refracting light efficiently
Data Source
AI summary
A display device includes a substrate, a lens layer including a plurality of lenses, and a plurality of pixel electrodes disposed between the substrate and the lens layer. The plurality of pixel electrodes include a first pixel electrode and a second pixel electrode. The plurality of lenses include a first lens disposed correspondingly to the first pixel electrode and a second lens disposed correspondingly to the second pixel electrode. An area of the first pixel electrode in plan view is greater than an area of the second pixel electrode in the plan view. An area of the first lens in the plan view is greater than an area of the second lens.