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 electrode 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 transitions from a two-dimensional planar layout where the data conductive pattern and capacitor electrode are on the same layer to a three-dimensional stacked structure. The capacitor electrode is moved to a different layer (above or below the data conductive pattern), utilizing the vertical dimension to separate the two conductive elements. This spatial separation in the third dimension eliminates the harmful electrical interaction while preserving the low-resistance data line design.
2Area of stationary object
If the storage capacitor is disposed close to the data line, then the layout is compact, but the driving current changes due to data signal influence
Solution Approach 1:
The patent maintains the compact pixel area by utilizing vertical stacking rather than horizontal spacing. The capacitor electrode is positioned in a different layer above or below the data conductive pattern, allowing close proximity in the planar view while maintaining electrical isolation through the insulating layers in the vertical dimension. This resolves the contradiction between compact layout and current stability.
3Reliability
If the data conductive pattern overlaps the data line, then the data line resistance is reduced, but the data signal affects the storage capacitor voltage
Solution Approach 1:
The patent segments the conductive elements into different functional layers. The data conductive pattern is separated from the capacitor electrode by placing them in distinct layers, with insulating layers (such as the over-coat layer) positioned between them. This segmentation allows the data conductive pattern to overlap the data line for low resistance while preventing electrical interaction with the capacitor, maintaining voltage stability through physical and electrical separation.
Data Source
AI summary
Discussed is an apparatus including a storage capacitor. The storage capacitor can be disposed close to a data line. The storage capacitor can include a first capacitor electrode and a second capacitor electrode. A data conductive pattern can be electrically connected to the data line. The data conductive pattern can be disposed on a same layer as the second capacitor electrode. An end of the first capacitor electrode can be disposed between the second capacitor electrode and the data conductive pattern. Thus, in the display apparatus, a distortion of the storage capacitor due to the data conductive pattern being electrically connected to the data line can be prevented.