OLED Active Layer Serpentine Layout for Voltage Drop Reduction
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Solution Overview
Problem
Conventional OLED displays face challenges in minimizing the length of active layers in the vertical direction, which can lead to increased voltage drops and current consumption due to the length of wiring, affecting the overall efficiency and performance.
Innovation Solution
The active layer of the driving thin film transistor is serpentinely formed along inclined directions with respect to the driving voltage and data lines, creating a chevron shape, which minimizes the vertical length of the active layer while maintaining the overall length, reducing voltage drops and improving current consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If data lines and driving voltage lines are extended to supply power to pixels, then the display area and pixel coverage are improved, but the line length increases causing voltage drop and current consumption issues
Solution Approach 1:
The active layer is configured to extend in an inclined direction (e.g., 45 degrees) relative to the data lines and driving voltage lines, transitioning from a conventional orthogonal layout to a diagonal arrangement. This dimensional change allows the active layer to span across pixels more efficiently, reducing the perpendicular distance to voltage lines and minimizing voltage drop while maintaining comprehensive pixel coverage
Solution Approach 2:
The active layer adopts a serpentine (curved/wavy) configuration instead of a straight linear path. This curved geometry allows the active layer to follow an optimized trajectory that reduces the effective length of current paths and minimizes voltage drop across the display area, while still maintaining electrical connection to all necessary pixels
2Area of stationary object
If data lines and driving voltage lines are extended to cover the display area, then the pixel coverage is improved, but the current consumption increases due to longer line lengths
Solution Approach 1:
By arranging the active layer at an inclined angle to the voltage lines, the design reduces the perpendicular distance that current must travel through the lines, thereby reducing resistive losses and current consumption while still achieving full display area coverage
Solution Approach 2:
The serpentine configuration of the active layer creates shorter and more efficient current paths compared to straight-line extensions, reducing the overall resistance and current consumption required to drive the display
Data Source
AI summary
An organic light-emitting diode (OLED) display is disclosed. In one aspect, the OLED display includes a plurality of scan lines extending in a first direction and a plurality of data lines extending in a second direction crossing the first direction. The OLED display also includes a plurality of pixels electrically connected to the scan lines and the data lines and arranged in a plurality of rows and columns, each pixel including an OLED and a thin film transistor electrically connected to the OLED. The OLED display further includes a plurality of driving voltage lines that supply a driving voltage to each of the pixels and extend in the second direction, wherein an active layer of a thin film transistor serpentinely extends along an inclined direction with respect to the second direction.