Array Substrate Constant Current Circuit for Display Data Line Reliability
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Solution Overview
Problem
In display technologies, parasitic capacitors on data lines significantly impact small data currents when writing small gray scale values, and existing methods struggle to amplify these currents effectively due to high technological requirements and limitations.
Innovation Solution
An array substrate with a constant current circuit that supplies a preset current along data lines, reducing the impact of parasitic capacitors by maintaining a consistent current magnitude, thereby enhancing the data current written into pixel circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data current is amplified proportionally by pixel circuit design to reduce parasitic capacitor impact, then the impact of parasitic capacitors on small data current is reduced, but technological requirements become very high and amplification of very small currents is limited
Solution Approach 1:
The patent introduces a constant current circuit as an intermediary component connected to the second end of the data line. This constant current circuit supplies a preset current that flows through the data line, serving as a mediator to counterbalance the charge-discharge effects of parasitic capacitors. By adding this intermediate current source, the system achieves reliable writing of small gray scale values without requiring complex pixel circuit amplification designs.
2Reliability
If data current is amplified to overcome parasitic capacitor effects, then small data current reliability improves, but the ability to amplify very small original currents is limited
Solution Approach 1:
The patent changes the parameter approach from proportional amplification (which has limited capability for very small currents) to adding a constant preset current. The constant current circuit maintains a fixed current value that flows through the data line regardless of the data current magnitude. This parameter change enables the system to handle very small data currents effectively, as the constant current provides a stable baseline that overcomes parasitic capacitor effects without requiring high amplification factors.
3Reliability
If constant current circuit is added to supply preset current through data lines, then parasitic capacitor impact on small data current is reduced, but device structure becomes more complex
Solution Approach 1:
The patent segments the current supply function into two independent parts: the current source circuit connected to the first end of the data line for providing data current, and the constant current circuit connected to the second end of the data line for providing preset current. This segmentation allows each circuit to perform its specific function independently, simplifying the overall design and reducing the complexity burden that would result from trying to achieve both functions in a single integrated circuit.
Solution Approach 2:
The constant current circuit acts as an intermediary component that supplies preset current through the data line to counterbalance parasitic capacitor effects. By positioning this intermediary at the second end of the data line (opposite the current source), the patent creates a balanced current flow arrangement that effectively mitigates parasitic effects without requiring complex integration with the existing pixel circuits.
4Reliability
If proportional amplification is used in pixel circuits, then small data current is enhanced, but strict amplification scale guarantee is required increasing manufacturing precision demands
Solution Approach 1:
The patent changes the current handling parameter from proportional amplification (which requires strict scale guarantees) to constant current addition. The constant current circuit supplies a fixed preset current value that does not depend on amplification factors. This parameter change eliminates the need for high-precision amplification scale control, as the constant current provides a stable baseline that automatically compensates for parasitic capacitor effects regardless of the specific data current magnitude.
Data Source
AI summary
Embodiments of the present disclosure provide an array substrate and a display device, wherein the array substrate includes a plurality of scanning signal lines, a plurality of data lines, a plurality of pixel circuits disposed at intersections between the plurality of scanning signal lines and the plurality of data lines, a current source circuit connected to first ends of the plurality of data lines and configured to output a current to the pixel circuits through the plurality of data lines, and a constant current circuit connected to second ends of the plurality of data lines and configured to supply a current with a preset value flowing from the first ends to the second ends to the data lines. The display device includes the foregoing array substrate.