Display Device Power Sharing Lines Aperture Ratio
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Solution Overview
Problem
The challenge is to enhance the aperture ratio in organic light emitting display devices to improve display performance and lifespan, while also simplifying the structure and reducing load deviation of sensing lines within a limited space.
Innovation Solution
The solution involves a display device design with a first power sharing line parallel to a direction and first and second pixels crossing that direction, along with a second power sharing line parallel to the first power sharing line, allowing for shared power lines between adjacent subpixels and reduced sensing line contact holes, which improves the aperture ratio and simplifies the structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the storage capacitor is provided per pixel to maintain current during light emission, then the display device can maintain stable light output, but the aperture ratio is reduced due to the occupied area
Solution Approach 1:
The power supply network is segmented into multiple power sharing lines (first power sharing line, second power sharing line) that distribute power to different pixel groups independently. This segmentation allows for optimized power distribution without requiring large individual capacitor areas in each pixel, thus maintaining reliability while improving aperture ratio.
Solution Approach 2:
The patent transitions from a traditional planar capacitor layout within each pixel to a three-dimensional power sharing network that extends across multiple pixel rows and columns. By utilizing the spatial dimension across the display panel, power can be shared among multiple pixels without increasing the area occupied within each individual pixel, thereby maintaining current stability while improving aperture ratio.
2Reliability
If traditional power line configuration is used, then power can be supplied to each pixel, but the structure becomes complex and load deviation of sensing lines increases
Solution Approach 1:
Adjacent pixels share common power lines (first power sharing line, second power sharing line) instead of each pixel having dedicated power lines. This merging of power supply paths reduces the total number of power lines required, simplifying the overall structure while maintaining reliable power supply to all pixels. The shared power lines reduce sensing line contact holes and minimize load deviation.
3Reliability
If more power lines are provided for each pixel, then power supply reliability improves, but the aperture ratio decreases and structure becomes more complex
Solution Approach 1:
The power sharing lines serve multiple functions: they provide power to multiple pixels simultaneously, act as reference lines for sensing operations, and reduce the overall number of required power lines. This multi-functionality ensures reliable power supply without increasing the area occupied by power lines in each pixel, thus maintaining high aperture ratio while improving power supply reliability.
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 increases luminance and extends the lifespan of the light emitting diode by improving the aperture ratio, while also reducing load deviation and simplifying the structure, thereby enhancing overall display performance.
Implementation Method 1
the organic light emitting display device is a self-luminance display device using an organic light emitting diode which injects holes from an anode and electrons from a cathode into a light emitting layer and emits light when an exciton generated by the combination of the injected holes and electrons changes its state from an excited state to a ground state
Data Source
AI summary
A display device according to an example includes a first power sharing line disposed to be parallel with a first direction, first and second pixels disposed along a second direction crossing the first direction with the first power sharing line interposed therebetween, and a second power sharing line disposed to be parallel with the first power sharing line with any one of the first and second pixels interposed therebetween.