Transparent OLED Pixel Unit Power Line Branching
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Solution Overview
Problem
Conventional self-illuminating transparent displays, particularly organic electroluminescent displays, suffer from image blur and Moire fringes due to the mesh structure of power and data lines, which obstruct background light and interfere with periodic structures, compromising transparency and display quality.
Innovation Solution
The pixel unit design includes a power line with branch portions distributed within the transparent area, electrically independent from data lines, to minimize light transmittance differences and prevent concentration of lines at specific positions, thereby improving image clarity and reducing Moire fringes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power line and data line are disposed inside a specific mesh region, then the driving characteristics of the organic light emitting layer are satisfied, but light transmittance is reduced and background image clarity is compromised
Solution Approach 1:
The power line is divided into a main portion and multiple branch portions. The main portion is disposed outside the transparent area while branch portions extend into the transparent area to connect to control elements. This segmentation allows the power line to satisfy driving requirements while minimizing obstruction of background light in the transparent area.
Solution Approach 2:
The power line structure transitions from a conventional two-dimensional mesh to a three-dimensional configuration with branch portions extending in different spatial directions. The main portion runs along the light emitting area boundary while branch portions penetrate into the transparent area, creating a multi-layered spatial arrangement that reduces light blocking.
2Power
If a mesh structure composed of vertical and horizontal lines is used for the power line, then the power distribution is achieved, but Moire fringes are generated when interfering with periodic background structures
Solution Approach 1:
The power line structure uses asymmetric branching patterns where branch portions extend from the main portion at various angles and positions rather than forming a symmetric mesh. This asymmetry disrupts periodic interference patterns with background structures, thereby reducing Moire fringes while maintaining power distribution functionality.
Solution Approach 2:
The branch portions are designed with curved or angled configurations rather than strictly straight horizontal and vertical lines. This curvature breaks the rigid periodicity of conventional mesh structures, reducing interference with periodic background patterns and minimizing Moire fringe generation.
3Power
If the power line is concentrated at specific positions, then the power delivery is efficient, but light transmittance uniformity is reduced causing image blur
Solution Approach 1:
The power line is segmented into a main portion for efficient power delivery and multiple branch portions for distributed connection to control elements. This segmentation allows power to be delivered efficiently through the main portion while branch portions are distributed to maintain uniform light transmittance across different regions of the transparent area.
Solution Approach 2:
Different portions of the power line structure serve different functions: the main portion is optimized for power delivery efficiency with larger cross-section, while branch portions are optimized for light transmittance uniformity with smaller cross-sections and strategic positioning. This local quality differentiation resolves the contradiction between power efficiency and transmittance uniformity.
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 design enhances the transparent display effect by reducing image blur and minimizing Moire fringes, allowing for clearer background image visibility and improved light transmittance across the display.
Implementation Method 1
an organic light-emitting diode disposed inside the light emitting area and electrically connected to the power line and the control element
Data Source
AI summary
A pixel unit of an organic electroluminescent display having a light emitting area and a transparent area is provided. The pixel unit includes a scan line, a data line, a control element electrically connected to the scan line and the data line, a power line electrically connected to the control element and an organic light-emitting diode disposed inside the light emitting area and electrically connected to the power line and the control element. The power line includes a main portion and a plurality of branch portions connected to the main portion. The branch portions are disposed inside the transparent area and electrically independent from the data line. A width of each of the branch portions is identical to a minimum line width of the data line.