Color Conversion Display Pixel Layout With Reduced Dead Space
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Solution Overview
Problem
Current display device fabrication processes are complex due to high dead space and the need for multiple masks, which complicates the production of efficient and effective display devices.
Innovation Solution
A simplified fabrication method for a display device that minimizes dead space and reduces the number of masks by using a substrate with pixel regions, including a color filter, electrodes, light emitting elements, and a color conversion layer, where the color conversion layer absorbs and emits light to enhance light guidance and reduce light loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional fabrication processes are used, then display devices can be manufactured, but the process becomes complex due to high dead space and multiple masks
Solution Approach 1:
The patent combines the color filter layer and color conversion layer into a single integrated structure where the color filter is positioned on the substrate and the color conversion layer is positioned on the light emitting elements with overlapping regions. This merging eliminates the need for separate mask alignment processes for each layer, simplifying the fabrication process while reducing dead space.
Solution Approach 2:
The patent utilizes vertical stacking in the third dimension by positioning the color filter on the substrate and the color conversion layer above the light emitting elements, with overlapping regions in the vertical dimension. This dimensional approach allows light to pass through the overlapping regions effectively while minimizing lateral dead space, thereby simplifying the overall fabrication process.
2Manufacturing precision
If multiple masks are used for alignment, then precise positioning is achieved, but the number of fabrication steps increases
Solution Approach 1:
The overlapping region between the color filter and color conversion layer serves multiple functions: it enables precise alignment without requiring separate mask processes, acts as an optical pathway for light emission, and defines the pixel structure. This multi-functional design achieves manufacturing precision while improving fabrication efficiency by reducing the number of required masks.
3Area of stationary object
If dead space is reduced, then device area is minimized, but fabrication complexity increases
Solution Approach 1:
The patent implements a nested structure where the color filter is positioned on the substrate and the color conversion layer is positioned on the light emitting elements, with the overlapping region containing both layers. This nesting arrangement minimizes dead space by efficiently utilizing the vertical dimension while maintaining a simple fabrication process through the integrated design.
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 method simplifies the fabrication process, reduces light loss, and improves the efficiency of the display device by aligning the color filter and color conversion layer to overlap with light emitting elements, guiding light effectively between surfaces.
Implementation Method 1
color conversion layer on the first contact electrode and the second contact electrode and including color conversion particles that absorb the light of the first color and emit a light of a second color
Implementation Method 2
color conversion particles that absorb the light of the first color and emit a light of a second color
Implementation Method 3
a color filter on the first surface of the substrate and corresponding to the second region
Data Source
AI summary
A display device may include a substrate including a plurality of pixel regions, each including a first region and a second region; and a pixel in each of the pixel regions. The pixel may include a display element portion including a plurality of light emitting elements that emit a light of a first color. The display element portion may include a color filter on the first surface of the substrate and corresponding to the second region, a first electrode and a second electrode on the color filter and spaced apart from each other in a first direction, the plurality of light emitting elements, which are between the first electrode and the second electrode, a first contact electrode on the first electrode and a second contact electrode on the second electrode, and a color conversion layer on the first contact electrode and the second contact electrode and including color conversion particles.