Display Device Aperture Structure for Brightness
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
As display devices with higher resolution increase the number of display elements and apertures, the reduced area for the organic layer leads to decreased light emitting area and brightness, resulting in lower display quality.
Innovation Solution
The configuration of display devices includes a base with pixel circuits, an insulating layer, apertures, and display elements with a lower electrode, organic layer, and upper electrode, where the organic layer is placed in the aperture covering the lower electrode, and the upper electrode covers the organic layer, ensuring contact over the entire aperture surface without partitions, thereby maximizing the light emitting area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of display elements is increased to achieve higher resolution, then the display quality is improved, but the light emitting area is reduced resulting in decreased brightness
Solution Approach 1:
The aperture is designed with a tapered structure extending in the thickness direction, transforming a two-dimensional planar connection into a three-dimensional volumetric structure. This allows the organic layer to contact both electrodes over the entire surface area of the aperture, effectively increasing the light emitting area without increasing the planar footprint, thus resolving the contradiction between high resolution and brightness
2Adaptability or versatility
If the number of apertures is increased to connect more pixel circuits, then the controllability of display elements is improved, but the area for the organic layer is reduced resulting in decreased light emitting area
Solution Approach 1:
The organic layer is nested within the tapered aperture structure, with the aperture positioned between the lower and upper electrodes. This nested configuration allows the organic layer to be contained within the aperture volume while maintaining contact with both electrodes, maximizing the use of available space and preventing area reduction despite increased aperture density
3Reliability
If partitions are added to separate display elements, then the reliability of individual element operation is improved, but the light emitting area is reduced due to interposition of non-emitting layers
Solution Approach 1:
The partition structure is extracted or removed from the aperture region, allowing the aperture to extend continuously from the lower electrode to the upper electrode without interruption. This eliminates the interposition of non-emitting partition layers within the light path, ensuring that the entire aperture surface contributes to light emission while maintaining element separation through other means
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 maintains a sufficient light emitting area even with higher resolution, preventing a decrease in luminance and ensuring improved display quality by eliminating the interposition of non-emitting layers between electrodes.
Implementation Method 1
an organic layer, and an upper electrode. The lower electrode is disposed above the insulating layer and connected to the pixel circuit through the aperture. The organic layer is disposed in the aperture and covers the lower electrode. The upper electrode covers the organic layer
Data Source
AI summary
According to one embodiment, a display device includes a base, a plurality of pixel circuits, an insulating layer, a plurality of apertures, a plurality of display elements and a partition. Each of the display elements includes a lower electrode, an organic layer and an upper electrode. The lower electrode and the organic layer are in contact over an entire surface of the aperture. The organic layer and the upper electrode are in contact over the entire surface of the aperture. The peripheral portion of the lower electrode is covered by the partition.