Display Apparatus Spacer and Common Electrode Layout for Parasitic Capacitance
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Solution Overview
Problem
The gate IC-less structure in display apparatuses can lead to parasitic capacitance between the gate driver and the common electrode, causing malfunctions.
Innovation Solution
A display apparatus design with a first substrate having a display area and a peripheral area, featuring a protective layer, spacers to maintain distance, and a common electrode on a second substrate, where the distance from the protective layer to the common electrode in the contact area is greater than in the non-contact area, reducing parasitic capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a gate IC-less structure is used to reduce size and increase efficiency, then the device complexity is reduced, but parasitic capacitance occurs between the gate driver and the common electrode causing malfunctions
Solution Approach 1:
The patent introduces a third dimension by forming the common electrode on the second substrate (opposite side to the first substrate) rather than on the same substrate plane. This spatial reconfiguration separates the gate driver circuit from the common electrode, eliminating the parasitic capacitance path while maintaining the gate IC-less structure's compactness.
Solution Approach 2:
The liquid crystal layer acts as an intermediary between the pixel electrode and the common electrode. By positioning the common electrode on the opposite substrate and using the liquid crystal layer as the separating medium, the patent blocks the parasitic capacitance coupling path while still allowing the necessary electrical field interaction for display operation.
2Volume of moving object
If the common electrode is positioned close to the gate driver to reduce overall device size, then the volume is reduced, but parasitic capacitance increases causing malfunctions
Solution Approach 1:
Instead of reducing the distance between the gate driver and common electrode in the planar direction, the patent moves the common electrode to the opposite substrate, utilizing the thickness dimension of the display panel. This allows the common electrode to be spatially separated from the gate driver while maintaining compact overall device volume.
Solution Approach 2:
The patent segments the display structure into distinct functional zones: the gate driver circuit is confined to the peripheral area of the first substrate, while the common electrode is positioned on the second substrate. This segmentation creates clear spatial separation that eliminates parasitic capacitance coupling.
Data Source
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AI summary
A display apparatus includes a first substrate, a second substrate with a liquid crystal layer disposed between the first and second substrates, a first spacer, and a second spacer. The first substrate includes a display area and a peripheral area. The first spacer is arranged in the peripheral area to maintain a distance between the first and second substrates, and the second spacer is arranged in the display area. A driving circuit includes a first signal line, a second signal line insulated from the first signal line, a protective layer, and a bridge electrode. The protective layer has a first contact hole exposing a portion of the first and second signal lines. The peripheral area includes a contact area corresponding to the first contact hole and a non-contact area proximal to the contact area. The first spacer is disposed in the non-contact area.