Active Matrix OLED Routing Lines Over Semiconductor Regions
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Solution Overview
Problem
Conventional active matrix organic light emitting display devices face limitations in aperture ratio and pixel size due to the increased number of thin film transistors and additional components, which restricts the layout and structure of thin film transistors, data lines, and power supply lines, thereby reducing the emission region area and pixel size.
Innovation Solution
Designing data lines and power supply lines to pass over the source, channel, and drain regions except for contact holes in the semiconductor layer, allowing for increased aperture ratio and pixel size without modifying the existing fabrication process, and creating space for additional thin film transistors and circuit components to enhance screen resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If additional thin film transistors and components are added to improve screen resolution, then device functionality is enhanced, but aperture ratio and pixel size are reduced
Solution Approach 1:
The patent applies dimensionality change by routing data lines and power supply lines to pass over the source, channel, and drain regions of thin film transistors in the vertical dimension, rather than only connecting through contact holes in the horizontal plane. This three-dimensional wiring approach frees up horizontal space in the pixel layout, allowing for larger aperture ratios while maintaining the necessary circuit connections for high screen resolution
Solution Approach 2:
The data lines and power supply lines are designed to serve multiple functions simultaneously: they provide electrical connections to thin film transistors through vertical passage over source/channel/drain regions, while also defining pixel boundaries and enabling flexible circuit configurations. This multi-functionality reduces the need for separate dedicated structures, thereby increasing the aperture ratio
2Measurement precision
If additional thin film transistors and components are added to improve screen resolution, then device functionality is enhanced, but pixel size is reduced
Solution Approach 1:
By transitioning from two-dimensional planar connections through contact holes to three-dimensional vertical passage over semiconductor regions, the patent reduces the horizontal footprint required for circuit connections. This enables smaller pixel sizes while accommodating the additional thin film transistors needed for high screen resolution displays
3Ease of manufacture
If data lines and power supply lines are routed through contact holes only, then manufacturing process is simple, but aperture ratio and design flexibility are reduced
Solution Approach 1:
The patent introduces design flexibility by making the data line and power supply line routing dynamic rather than fixed. The lines can adaptively pass over different semiconductor regions (source, channel, or drain) depending on the specific pixel layout requirements, enabling optimized aperture ratios while maintaining compatibility with existing fabrication processes
Solution Approach 2:
The invention changes the routing parameter of data lines and power supply lines from exclusively horizontal contact hole connections to vertical passage over semiconductor regions. This parameter change increases aperture ratio without requiring modifications to the fundamental fabrication process steps
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 approach increases the aperture ratio and pixel size of the active matrix organic light emitting display device, enabling improved screen resolution by allowing for more flexible circuit design and accommodating additional components without altering the existing fabrication process.
Implementation Method 1
The organic light emitting display device uses a phenomenon whereby light is generated by a process in which electron-hole pairs created by electrons and holes or carriers are excited to a higher energy level and then transitioned to a base level
Data Source
AI summary
The invention provides an active matrix organic light emitting display device and method of fabricating the same in which at least one of a data line and a power supply line of a unit pixel is designed to pass over at least one of a source region, a channel region, or a drain region in the corresponding semiconductor layer, except for in an area corresponding to a contact hole, so that an aperture ratio and a pixel size of the active matrix organic light emitting display device are enhanced. This arrangement of components creates areas of free space that may be used to accommodate additional thin film transistors and/or other circuit components that improve the screen resolution. This arrangement may also increase the aperture ratio and the size of the pixel of the active matrix organic light emitting display device without adding and modifying existing fabrication processes.