Display Panel TFT Layout for Higher Aperture Ratio
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Solution Overview
Problem
Current display technologies face a low aperture ratio issue due to the increasing number of thin film transistors (TFTs) in high-resolution displays, which occupy more space on the backplane, reducing the display's efficiency.
Innovation Solution
The design of a display panel with driving transistors arranged in a harpoon shape, where the source wiring is at the boundary of the light-transmitting region and the drain wiring is within it, allowing for a reduced footprint without affecting display area, and eliminating the need for a separate TFT region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of pixels is increased to achieve higher resolution, then the display resolution is improved, but the aperture ratio of the backplane is reduced due to increased TFT occupancy
Solution Approach 1:
The source wiring is moved from the traditional central position to the boundary region of the pixel, utilizing the space along the data signal line direction. This dimensional repositioning allows the TFT to coexist with the light-transmitting region without reducing aperture ratio, while still supporting higher pixel densities for improved resolution
Solution Approach 2:
The TFT structure is designed with asymmetric wiring placement where the source wiring is positioned at the boundary rather than symmetrically in the center. This asymmetric configuration optimizes space utilization by aligning the source wiring with the data signal line direction, reducing the footprint occupied by the TFT and thereby maintaining higher aperture ratios even as pixel counts increase
2Ease of manufacture
If a separate TFT region is reserved in the pixel, then the TFT can be properly fabricated, but the light-transmitting area is reduced
Solution Approach 1:
The boundary region of the pixel is designed to serve dual functions: it acts as both the light-transmitting region boundary and the location for TFT wiring placement. By making the boundary region multi-functional, the patent eliminates the need for a separate dedicated TFT region while still providing adequate space for TFT fabrication and operation
Solution Approach 2:
The patent merges the TFT wiring placement with the boundary structure of the light-transmitting region. Instead of separating the TFT region from the display area, the source wiring is integrated along the boundary, combining the structural boundary function with the electrical wiring function, thereby maximizing the light-transmitting area while ensuring proper TFT fabrication
Data Source
AI summary
A display panel and a display device are provided. A sub-pixel unit of the display panel includes at least one light-transmitting region, and each light-transmitting region is provided with at least one driving transistor. At least part of a source wiring of the driving transistor is disposed at a boundary of the light-transmitting region and parallel to an extension direction of data signal lines, and a drain wiring is disposed in the light-transmitting region. The light-transmitting region of the sub-pixel unit occupied by the driving transistor is reduced to alleviate a problem of low aperture ratio of a backplane of current display products.