Display Emission Area Segmentation for Uniform Luminance
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Solution Overview
Problem
Display devices face challenges in maintaining uniform luminance due to variations in the number of light emitting elements across sub-areas, leading to luminance deviations.
Innovation Solution
A display device design that includes an organic layer with strategically arranged electrodes and insulating layers, featuring openings that expose the organic layer to ensure uniform distribution of light emitting elements, and a bank structure to divide the emission area into sub-areas, allowing for additional light emitting elements to be supplied to areas with insufficient lighting, thereby adjusting the number of elements per sub-area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light emitting elements are arranged in the emission area, then the display device can emit light, but the number of light emitting elements varies across sub-areas causing luminance deviation
Solution Approach 1:
The emission area is divided into multiple sub-areas by banks, and openings are formed in each sub-area to expose the organic layer. This segmentation allows light emitting elements to be uniformly arranged within each sub-area, ensuring consistent luminance across the entire emission area while avoiding aggregation issues.
2Manufacturing precision
If openings are formed to expose the organic layer, then light emitting elements can be uniformly arranged, but the structural complexity increases
Solution Approach 1:
The first insulating layer serves multiple functions: it covers the first and second electrodes, provides structural support, and when formed with openings, enables uniform light emitting element arrangement. The banks also serve dual purposes of defining sub-areas and creating openings to expose the organic layer, reducing the need for separate components.
3Illumination intensity
If the emission area is divided into sub-areas with openings, then luminance consistency improves, but the manufacturing process becomes more complex
Solution Approach 1:
The first insulating layer is formed to cover the electrodes before the light emitting elements are arranged. Openings are then formed in this pre-formed insulating layer to expose the organic layer. This preliminary formation of the insulating layer with openings facilitates uniform light emitting element arrangement and improves brightness consistency while managing manufacturing complexity through staged processing.
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 solution effectively reduces luminance deviations by ensuring a uniform number of light emitting elements across sub-areas, enhancing the display's brightness consistency and overall performance.
Implementation Method 1
A surface of the organic layer exposed by the opening may have liquid repellant. The surface of the organic layer may include a fluoro group.
Data Source
AI summary
A display device includes an organic layer, a first electrode and a second electrode disposed on the organic layer and spaced apart from each other, a first insulating layer disposed on the first electrode and the second electrode, and first light emitting elements disposed on the first insulating layer and disposed between the first electrode and the second electrode. An opening is formed by passing through at least one of the first electrode and the second electrode and the first insulating layer and exposes the organic layer.