Dual-Gate LCD Pixel Structure for Shielding and Moisture Reliability
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Solution Overview
Problem
Liquid crystal display devices face challenges in maintaining high pixel density and reliability due to complex layer structures and exposure of metal wiring, which leads to moisture infiltration and reduced long-term reliability.
Innovation Solution
A liquid crystal display device structure featuring a dual-gate transistor with an oxide semiconductor layer sandwiched between gate electrodes, oxide conductive layers, and insulating layers, where the pixel electrode is connected to the oxide conductive layers, and the common electrode overlaps with the pixel electrode, reducing the complexity of the layer structure and minimizing exposure of metal wiring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If shield electrodes are laminated to shield signal lines, then electric field shielding is improved, but the layer structure becomes complicated and aperture ratio is lowered
Solution Approach 1:
The patent combines the shield electrode function with the common electrode by making the common electrode extend over the signal line region. This integration eliminates the need for separate shield electrodes, reducing layer structure complexity while maintaining electric field shielding effectiveness. The common electrode serves dual purposes: as a standard display electrode and as a shield against signal line electric fields.
Solution Approach 2:
The common electrode is designed to perform multiple functions simultaneously: it acts as the standard common electrode for liquid crystal modulation and also serves as a shield electrode by extending over the signal lines. This multi-functionality reduces the total number of electrodes needed, simplifying the overall structure while maintaining both display performance and electric field shielding.
2Object-affected harmful factors
If shield electrodes are laminated to shield signal lines, then electric field shielding is improved, but aperture ratio is lowered
Solution Approach 1:
By merging the shield electrode function into the common electrode, the patent eliminates the need for additional electrode layers that would reduce aperture ratio. The common electrode's extension over signal lines provides shielding without requiring separate shield electrode structures, thus preserving the aperture area.
3Ease of manufacture
If layer structure is simplified without shield electrodes, then manufacturing is easier, but electric field of signal line acts on liquid crystal layer reducing reliability
Solution Approach 1:
The common electrode is designed to perform multiple functions simultaneously: it acts as the standard common electrode for liquid crystal modulation and also serves as a shield electrode by extending over the signal lines. This multi-functionality reduces the total number of electrodes needed, simplifying the overall structure while maintaining both display performance and electric field shielding.
4Power
If dual gate structure is implemented, then on-current is improved, but device complexity increases
Solution Approach 1:
The patent integrates the two gate electrodes into a unified structure where both gates are formed in the same layer plane, sharing common insulating layers and alignment structures. This integration reduces the overall structural complexity compared to completely separate gate structures, while maintaining the high on-current benefit of dual gate operation.
Data Source
AI summary
A liquid crystal display device includes a transistor, a pixel electrode, and a common electrode. The transistor includes a first gate electrode on a first substrate, a second gate electrode having a region overlapping the first gate electrode, an oxide semiconductor layer between the first gate electrode and the second gate electrode, a first insulating layer between the first gate electrode and the oxide semiconductor layer, a second insulating layer between the oxide semiconductor layer and the second gate electrode, and a first oxide conductive layer and a second oxide conductive layer 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.