OLED Display Panel Trapezoid Layout for Reduced Color Mixing
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Solution Overview
Problem
Existing OLED display panels suffer from issues such as poor text display effect, jaggedness when displaying oblique lines, and hidden lighting of sub-pixels due to differences in turn-on threshold voltages and close proximity of adjacent sub-pixels, leading to color mixing and reduced pixel density.
Innovation Solution
A novel pixel arrangement structure is introduced, where each pixel unit comprises four first sub-pixels, two second sub-pixels, and two third sub-pixels, forming specific geometric patterns like virtual isosceles trapezoids and quadrilaterals, optimizing the spatial arrangement to reduce color mixing and increase pixel density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If adjacent sub-pixels are arranged closely to increase pixel density, then pixel density is improved, but color mixing occurs and display quality deteriorates
Solution Approach 1:
The pixel unit is segmented into multiple sub-pixels (first, second, and third sub-pixels) with different functions. The second and third sub-pixels serve as light-emitting sub-pixels while the first sub-pixels serve as auxiliary sub-pixels. This segmentation allows close arrangement for high pixel density while maintaining display quality through functional differentiation that prevents color mixing.
Solution Approach 2:
Different sub-pixels within the same pixel unit have different local qualities and functions. The light-emitting sub-pixels (second and third) and auxiliary sub-pixels (first) are positioned at specific locations forming a virtual isosceles trapezoid. This local quality differentiation enables the structure to achieve high pixel density while preventing color mixing through optimized spatial arrangement of different functional elements.
2Ease of manufacture
If sub-pixels are arranged in conventional patterns, then manufacturing is simple, but display quality suffers from jaggedness and poor text display
Solution Approach 1:
The sub-pixels are arranged in an asymmetric virtual isosceles trapezoid pattern rather than a conventional symmetric grid. The second and third sub-pixels form vertices of the trapezoid while the first sub-pixels are positioned at specific locations. This asymmetric arrangement improves display quality by reducing jaggedness and enhancing text display while remaining manufacturable through standard deposition processes.
3Device complexity
If turn-on threshold voltages of sub-pixels are not optimized, then device complexity is low, but hidden lighting of sub-pixels occurs
Solution Approach 1:
The invention optimizes the turn-on threshold voltages of different sub-pixels by controlling the doping concentrations of hole injection layers and electron injection layers at specific positions. The hole injection layer doping concentration and electron injection layer doping concentration are adjusted to ensure that the turn-on threshold voltages of second and third sub-pixels are lower than that of the first sub-pixel, preventing hidden lighting while maintaining manageable device complexity.
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 new arrangement significantly improves display quality by minimizing jaggedness, reducing color fringing, and enhancing pixel density, while also increasing the production yield and service life of sub-pixels.
Implementation Method 1
the evaporation source moves along the fourth direction to perform a vapor deposition on a display panel
Data Source
AI summary
A display panel, a display device, and an evaporation device are provided. The display panel includes a plurality of pixel units arranged in an array. Each pixel unit includes four first sub-pixels, two second sub-pixels, and two third sub-pixels. Centers of the two second sub-pixels and centers of the two third sub-pixels form a virtual isosceles trapezoid. The two second sub-pixels are located on both ends of a diagonal of the virtual isosceles trapezoid, and the two third sub-pixels are located on both ends of another diagonal of the virtual isosceles trapezoid. Centers of the four first sub-pixels form a virtual quadrilateral. An interior of the virtual quadrilateral includes one second sub-pixel of the two second sub-pixels, and an interior of the virtual isosceles trapezoid includes one first sub-pixel of the four first sub-pixels.