Transparent OLED Pixel Aperture Ratio via Vertical Overlap
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Solution Overview
Problem
Transparent OLED display panels face a limitation in pixel aperture ratio due to the stacking of electroluminescent structures and pixel circuits, which reduces the transparent light-emitting regions and affects display efficiency.
Innovation Solution
The introduction of a reflection layer between the pixel circuit and the electroluminescent layer, with its projection overlapping the light-emitting region on the base substrate, increases the transparent area by forming an overlap region that enhances the pixel aperture ratio, and can include materials like Al, Ag, and Mo, and is electrically connected to the anode or cathode layers for improved conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If pixel circuits are placed in sub-pixels to drive electroluminescent structures, then the display function is achieved, but the pixel aperture ratio decreases due to non-transparent regions
Solution Approach 1:
The invention extends the electroluminescent structure vertically into the overlap region above the pixel circuit, utilizing the third dimension (z-axis) to create additional light-emitting area. This dimensional extension allows the light-emitting region to project beyond the traditional planar boundaries, effectively increasing the pixel aperture ratio without expanding the footprint area.
Solution Approach 2:
The electroluminescent structure is nested vertically above the pixel circuit in the overlap region, creating a stacked configuration where the light-emitting layer is positioned over the driving circuit. This nesting arrangement allows the pixel circuit to serve dual purposes: electrical driving function and structural support for the extended electroluminescent structure.
2Productivity
If electroluminescent structures are stacked on pixel circuits, then the transparent display function is achieved, but the transparent light-emitting region area is reduced
Solution Approach 1:
By extending the electroluminescent structure vertically into the overlap region, the invention creates additional transparent light-emitting area in the vertical dimension. This allows the transparent display function to be enhanced without sacrificing horizontal light-emitting area, as the extended structure emits light from the overlap region that was previously non-emissive.
3Area of stationary object
If the light-emitting region is extended to overlap with pixel circuit regions, then the pixel aperture ratio is increased, but the device complexity increases
Solution Approach 1:
The invention merges the electroluminescent structure with the pixel circuit layout by positioning them in vertical stacking within the overlap region. This integration allows the driving circuit to simultaneously serve as structural support and electrical driver, reducing the need for separate components and simplifying the overall device architecture despite the extended light-emitting area.
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 increases the area occupied by electroluminescent structures, thereby enhancing the pixel aperture ratio and improving display brightness by allowing more light emission from the overlap regions, thus addressing the limitations of existing transparent OLED display panels.
Implementation Method 1
a reflection layer in at least one of the sub-pixels; wherein at least one of the electroluminescent structures includes an anode layer, an electroluminescent layer and a transparent cathode layer which are stacked; the reflection layer is between a layer of the pixel circuit and the electroluminescent layer
Data Source
AI summary
A transparent display panel and a display device are disclosed. The orthographic projection of light-emitting region of electroluminescent structure on a base substrate overlaps with the orthographic projection of the region of the pixel circuit on the base substrate to form an overlap region, so that the area occupied by the electroluminescent structures in the sub-pixels is enlarged, thus increasing the pixel aperture ratio of the transparent display panel at the sides, away from the pixel circuits, of the electroluminescent structures.