OLED Subpixel Circuit Shielding for Data Line Crosstalk
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Solution Overview
Problem
Crosstalk in OLED display products is generated due to the coupling between data line patterns and the gate or first electrode of the driving transistor, affecting the operating performance of the driving transistor and impacting display quality.
Innovation Solution
A display substrate with a 7T1C subpixel driving circuitry is designed, incorporating a first shielding member coupled to an initialization signal line pattern to provide a fixed potential, reducing the effect of signal changes from adjacent data lines on the driving transistor and minimizing crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If data line patterns are placed close to the driving transistor to reduce pixel circuit area, then pixel area is reduced and resolution is improved, but crosstalk between data lines and the driving transistor increases, degrading operating performance
Solution Approach 1:
A shielding member is introduced as an intermediary element between the data line pattern and the driving transistor. This shielding member is coupled to a reference potential (ground or power supply voltage) and physically positioned to overlap with the data line pattern's projection, creating an electromagnetic shield that blocks parasitic coupling. The shielding member acts as a mediator that prevents harmful electromagnetic fields from reaching the driving transistor, thereby resolving the crosstalk issue while allowing close placement of data lines
Solution Approach 2:
The shielding member is coupled to a reference potential (either ground potential or power supply voltage) to create an equipotential barrier between the data line pattern and the driving transistor. By maintaining the shielding member at a fixed potential, voltage differences that cause parasitic coupling are eliminated, preventing crosstalk while allowing the data line to be positioned close to the driving transistor for compact pixel design
2Reliability
If shielding members are added to reduce crosstalk, then crosstalk is reduced and display quality is improved, but device complexity and manufacturing steps increase
Solution Approach 1:
The shielding member is merged with existing conductive structures in the display device, such as power supply lines or ground lines. By combining the shielding function with existing structures, the patent achieves crosstalk reduction without adding completely new components. The shielding member can be formed using the same material layers and manufacturing processes as other conductive elements, thereby reducing device complexity while maintaining effectiveness
Solution Approach 2:
The shielding member serves multiple functions: it acts as an electromagnetic shield to block crosstalk, while also potentially serving as a reference potential distribution line or a structural support element. This multi-functionality reduces the need for separate dedicated shielding structures, thereby simplifying the overall device design and reducing manufacturing complexity while maintaining display quality
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively alleviates crosstalk, improving the operating performance of the driving transistor and enhancing the display effect by stabilizing voltage and reducing vertical crosstalk.
Implementation Method 1
a first shielding member coupled to an initialization signal line pattern to provide a fixed potential, reducing the effect of signal changes from adjacent data lines on the driving transistor
Data Source
AI summary
A display substrate includes a substrate and a plurality of sub-pixels arranged in an array on the substrate. The sub-pixel includes: a data line pattern extending along a first direction; a power signal line pattern, the power signal line pattern including a portion extending along the first direction; and a sub-pixel driving circuit. The sub-pixel driving circuit includes two switching transistors, a driving transistor, and a storage capacitor; a first/second electrode plate of the storage capacitor is coupled to a gate electrode of the driving transistor/the power signal line pattern, second electrodes of the two switching transistors are both coupled to a first electrode of the driving transistor, and orthographic projection of a second electrode of at least one of the two switching transistors on the substrate at least partially overlaps orthographic projection of the power signal line pattern or the second electrode plate on the substrate.