Display Storage Capacitor Layout for Data Signal Isolation
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Solution Overview
Problem
The voltage stored in the storage capacitor of a display apparatus is affected by the data signal due to the proximity of the data conductive pattern on the same layer as the capacitor electrodes, leading to changes in the driving current.
Innovation Solution
The storage capacitor is spaced away from the data line, with the data conductive pattern overlapping a portion of the data line, and the second capacitor electrode is larger than the first, minimizing the influence of the data signal on the capacitor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the data conductive pattern is disposed on the same layer as the capacitor electrodes to reduce data line resistance, then the data line resistance is reduced, but the voltage stored in the storage capacitor is affected by the data signal
Solution Approach 1:
The patent applies dimensionality change by moving the storage capacitor from the same layer as the data conductive pattern to a different layer (either above or below). This spatial separation in the vertical dimension eliminates the harmful electromagnetic coupling between the data signal and the storage capacitor, while maintaining the low-resistance data line design through the data conductive pattern on its original layer.
Solution Approach 2:
The patent segments the display device structure into multiple layers, placing the storage capacitor in a separate layer from the data conductive pattern. This segmentation physically isolates the storage capacitor from the data signal interference while allowing the data conductive pattern to function independently on its designated layer for reducing data line resistance.
2Area of moving object
If the storage capacitor is disposed close to the data line to reduce area, then the pixel area is reduced, but the data signal affects the voltage stored in the storage capacitor
Solution Approach 1:
The patent resolves this contradiction by utilizing the vertical dimension through multi-layer construction. The storage capacitor is positioned in a layer different from the data conductive pattern, allowing close horizontal proximity (saving pixel area) while maintaining vertical separation (avoiding data signal interference).
3Reliability
If the data conductive pattern is disposed on the data line to reduce resistance, then the data line resistance is reduced, but the driving current changes due to voltage change in storage capacitor
Solution Approach 1:
The patent applies dimensionality change to separate the storage capacitor vertically from the data conductive pattern. This ensures that the data conductive pattern can maintain low resistance on the data line while the storage capacitor, positioned on a different layer, remains isolated from data signal interference, thereby maintaining stable driving current.
Data Source
AI summary
Discussed is a display apparatus including a signal line on a substrate, a conductive pattern overlapping with the signal line, the conductive pattern electrically connected to the signal line, and a storage capacitor including a first capacitor electrode disposed on a different layer from the signal line and the conductive pattern, and a second capacitor electrode disposed on a same layer as the conductive pattern. The signal line and the conductive pattern are spaced apart from the storage capacitor. The second capacitor electrode has a smaller size than the first capacitor electrode, and a portion of the first capacitor electrode overlaps with a region disposed between the second capacitor electrode and the conductive pattern.