Curved TFT Channel Layout for Higher LCD Aperture Ratio
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Solution Overview
Problem
Conventional liquid crystal display devices face challenges in improving the aperture ratio, which is essential for achieving high brightness and reliability, due to difficulties in the layout of wiring and other structural limitations.
Innovation Solution
The design incorporates a semiconductor layer with a channel region bent in a region overlapping the gate electrode, along with a specific configuration of insulating layers and conductive layers, including transparent conductive layers, to enhance the aperture ratio and support high-definition display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If conventional wiring layout is used, then structural simplicity is maintained, but aperture ratio cannot be improved
Solution Approach 1:
The patent applies dimensionality change by routing the source line in a curved path instead of a straight line, utilizing the two-dimensional plane more efficiently. The source line extends in the first direction and then curves to extend in the second direction, allowing it to reach the semiconductor layer without increasing planar footprint. This curved routing enables better spacing from the gate electrode and improves aperture ratio while maintaining wiring functionality.
Solution Approach 2:
The wiring structure is segmented into multiple sections: a first portion extending in the first direction from the contact hole, and a second portion extending in the second direction from the first portion. This segmentation allows each segment to be optimized independently for its specific function, with the first portion connecting to the contact hole and the second portion routing to the semiconductor layer, thereby improving overall aperture ratio.
2Illumination intensity
If aperture ratio is improved, then brightness is enhanced, but risk of electrical short-circuit increases
Solution Approach 1:
The patent applies local quality by providing different spacing relationships at different locations of the wiring structure. The source line is spaced apart from the gate electrode by a first distance in the region where the source line extends in the first direction, and by a second distance in the region where the source line extends in the second direction. This localized spacing control ensures sufficient insulation where needed while optimizing aperture ratio in other regions.
Solution Approach 2:
The insulating layer acts as an intermediary between the source line and the gate electrode, providing electrical insulation. The insulating layer is positioned between the source line and the gate electrode, preventing electrical short-circuits while allowing the wiring to be routed close to the gate electrode region for optimal aperture ratio.
3Area of stationary object
If channel region is bent, then aperture ratio is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies curvature by bending the channel region in a curved path rather than a straight line. The channel region extends in the first direction and then curves to extend in the second direction, allowing it to reach the semiconductor layer while maintaining proper spacing from the gate electrode. This curved configuration improves aperture ratio while the manufacturing process controls the curvature within specified tolerances.
Data Source
AI summary
According to one embodiment, a display device includes a semiconductor layer, a first insulating layer, a gate electrode, a second insulating layer and a plurality of transparent conductive layers. The transparent conductive layers include a pixel electrode, a first conductive layer and a second conductive layer. The pixel electrode is in contact with the second conductive layer. The second conductive layer is in contact with the first conductive layer. The first conductive layer is brought into contact with a second region of the semiconductor layer through a first contact hole.