Dual-Gate LCD Pixel Transistor Layout for Aperture and Reliability
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Solution Overview
Problem
Existing liquid crystal display devices face issues with complex layer structures that compromise aperture ratio and long-term reliability due to shield electrodes or electric field interference, and high manufacturing costs and reduced reliability from direct contact between metal wiring and sealing materials.
Innovation Solution
The implementation of a dual gate transistor structure with embedded wiring in an insulating layer within the pixel, using an oxide semiconductor layer and dual gate electrodes, enhances reliability and reduces manufacturing complexity by preventing direct contact with sealing materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If shield electrodes are laminated to shield the electric field from signal lines, then the electric field shielding effect is improved, but the layer structure becomes complicated and the aperture ratio of the pixel is lowered
Solution Approach 1:
The patent extracts the shielding function from a separate laminated shield electrode layer and integrates it into the signal line structure itself. The signal line is configured with a shielded structure where the shielding function is built-in, eliminating the need for additional laminated shield layers while maintaining electric field shielding effectiveness.
Solution Approach 2:
The patent merges the signal line and shield electrode functions into a single integrated structure. The signal line incorporates shielding elements directly, combining the signal transmission function with the electric field shielding function, thereby reducing the number of separate layers and simplifying the overall layer structure.
2Object-affected harmful factors
If shield electrodes are laminated to shield the electric field from signal lines, then the electric field shielding effect is improved, but the aperture ratio of the pixel is lowered
Solution Approach 1:
The patent extracts the shielding function from a separate laminated shield electrode layer and integrates it into the signal line structure itself. The signal line is configured with a shielded structure where the shielding function is built-in, eliminating the need for additional laminated shield layers while maintaining electric field shielding effectiveness.
Solution Approach 2:
The patent merges the signal line and shield electrode functions into a single integrated structure. The signal line incorporates shielding elements directly, combining the signal transmission function with the electric field shielding function, thereby reducing the number of separate layers and simplifying the overall layer structure.
3Area of stationary object
If the layer structure is simplified without shield electrodes, then the aperture ratio is improved, but the electric field of the signal line acts on the liquid crystal layer, lowering long-term reliability
Solution Approach 1:
The patent extracts the shielding function from a separate laminated shield electrode layer and integrates it into the signal line structure itself. The signal line is configured with a shielded structure where the shielding function is built-in, eliminating the need for additional laminated shield layers while maintaining electric field shielding effectiveness.
Solution Approach 2:
The patent merges the signal line and shield electrode functions into a single integrated structure. The signal line incorporates shielding elements directly, combining the signal transmission function with the electric field shielding function, thereby reducing the number of separate layers and simplifying the overall layer structure.
4Ease of manufacture
If metal wiring directly contacts sealing materials, then manufacturing process is simplified, but reliability is reduced due to moisture ingress
Solution Approach 1:
The patent introduces an insulating layer as an intermediary between the metal wiring and the sealing material. This insulating layer prevents direct contact between the metal wiring and sealing material, thereby preventing moisture ingress pathways while maintaining manufacturing feasibility. The insulating layer acts as a barrier that protects the metal wiring from moisture contamination.
Data Source
Figure 1
Figure 2~3
Figure 4A~4B
AI summary
A liquid crystal display device includes a transistor (202), a pixel electrode (136), and a common electrode (138). The transistor includes a first gate electrode (120) on a first substrate (100), a second gate electrode (132) having a region overlapping the first gate electrode, an oxide semiconductor layer (128) between the first gate electrode and the second gate electrode, a first insulating layer (122) between the first gate electrode and the oxide semiconductor layer, a second insulating layer (130) between the oxide semiconductor layer and the second gate electrode, and a first oxide conductive layer (124a) and a second oxide conductive layer (124b) disposed between the first insulating layer and the oxide semiconductor layer and disposed with the first gate electrode and the second gate electrode sandwiched from both sides. The pixel electrode is disposed between the first and the second insulating layer; the common electrode is disposed a region overlapping with the pixel electrode and on the second insulating layer.