Pixel-Offset Lens Display Structure for Viewing and Radiation Angles
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Solution Overview
Problem
Existing display devices, such as organic EL display devices, face challenges in improving visual field angle characteristics and increasing radiation angle.
Innovation Solution
A display device design that includes a substrate, a lens layer with lenses, a pixel electrode, and a color filter, where the color filter overlaps part of the pixel electrode, and the lens is positioned to overlap the pixel electrode, with a shorter distance between the pixel electrode center and the display center compared to the lens center, enhancing light emission and radiation characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional display device structure is used, then the device is simple to manufacture, but the visual field angle characteristic is poor and radiation angle is limited
Solution Approach 1:
The patent introduces a lens layer with microlenses having a convex (spheroidal) shape to control and expand the radiation angle of emitted light. The curved lens surfaces refract light to achieve wider viewing angles while maintaining a relatively simple planar substrate structure, thus improving radiation characteristics without excessively increasing device complexity.
Solution Approach 2:
The patent offsets the lens layer from the pixel electrode plane in the vertical dimension, creating a three-dimensional arrangement where the lens center is positioned at a different location than the pixel electrode center. This dimensional offset allows optimization of light extraction and radiation angle without requiring complex lateral rearrangement of components.
2Illumination intensity
If the lens is positioned directly over the pixel electrode center, then the structure is symmetric and simple, but the visual field angle characteristic cannot be optimized
Solution Approach 1:
The patent deliberately introduces asymmetry by offsetting the lens center from the pixel electrode center. This asymmetric positioning allows the lens to capture and redirect light from the pixel electrode more effectively, optimizing the visual field angle characteristic. The asymmetric design is implemented with controlled precision to achieve the desired optical performance.
3Illumination intensity
If the color filter completely covers the pixel electrode, then color purity is maximized, but light emission efficiency is reduced
Solution Approach 1:
The patent implements local quality by having the color filter partially overlap the pixel electrode rather than completely covering it. This partial overlap configuration allows different regions to serve different functions: the overlapping region provides color filtering where needed, while the non-overlapping region allows direct light emission. This localized approach optimizes both color purity and light emission efficiency.
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 improves the visual field angle and radiation angle by optimizing the light path, resulting in enhanced light emission and display performance.
Implementation Method 1
a lens layer including a lens... the lens overlaps a part of the pixel electrode... optimizing the light path
Data Source
AI summary
A display device according to the present disclosure includes a substrate, a lens layer including a lens, a pixel electrode disposed between the substrate and the lens layer, and a color filter disposed between the pixel electrode and the lens layer. The color filter includes a colored portion that overlaps a part of the pixel electrode in plan view and is disposed between the substrate and the lens layer. The pixel electrode is provided in a display region in which an image is displayed. The lens overlaps a part of the pixel electrode in the plan view. A distance between the center of the pixel electrode and the display center of the display region is shorter than a distance between the center of the lens and the display center in the plan view.