OLED Display Subpixel Shielding Layout for Crosstalk Reduction
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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 deteriorating display quality.
Innovation Solution
A display substrate with a 7T1C subpixel driving circuitry is designed, incorporating a first shielding member coupled to the initialization signal line at a fixed potential to reduce crosstalk by shielding the first electrode of the driving transistor, and a second shielding member is used to stabilize the power source signal line, thereby improving the operating performance and display effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If data line patterns are placed close to the driving transistor to increase pixel density, then productivity is improved, but crosstalk increases due to coupling between data lines and the gate or first electrode of the driving transistor
Solution Approach 1:
The patent introduces a shielding member as an intermediary element positioned between the data line pattern and the gate or first electrode of the driving transistor. This shielding member acts as a mediator that blocks or reduces the electromagnetic coupling (crosstalk) between the data lines and sensitive transistor elements, allowing data lines to be placed closer to increase pixel density without suffering from harmful crosstalk effects.
Solution Approach 2:
The patent segments the spatial arrangement by introducing a separate shielding member layer that is distinct from both the data line pattern and the driving transistor structure. This segmentation allows independent optimization of data line positioning for high pixel density while the shielding member independently handles the crosstalk mitigation function.
2Reliability
If shielding members are added to reduce crosstalk, then reliability is improved, but device complexity increases due to additional structural elements
Solution Approach 1:
The shielding member is designed to serve multiple functions: it primarily reduces crosstalk between data lines and the driving transistor, but it can also serve as part of the pixel electrode structure or be integrated with other display layer components. This multi-functionality reduces the need for separate dedicated shielding structures, thereby limiting the increase in device complexity.
3Reliability
If the initialization signal line is stabilized at a fixed potential, then reliability is improved by reducing crosstalk impact, but use of energy increases due to continuous potential maintenance
Solution Approach 1:
The patent applies preliminary anti-action by pre-stabilizing the initialization signal line at a fixed potential before data lines are activated. This preliminary stabilization creates a reference potential that is immune to subsequent crosstalk from data line switching, allowing the initialization signal to maintain its function without requiring continuous energy input during data transmission phases.
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 reduces crosstalk and enhances the operating performance of the driving transistor, leading to improved display quality by stabilizing the voltage across the initialization signal line and reducing the impact of signal changes from adjacent data lines.
Implementation Method 1
a first shielding member coupled to an initialization signal line at a fixed potential is provided in the display substrate. The orthogonal projection of the first shielding member onto the substrate is located between an orthogonal projection of the first transistor onto the substrate and an orthogonal projection of a target data line pattern onto the substrate
Implementation Method 2
The first shielding member is configured to form a coupling capacitor with a first electrode of the first transistor
Data Source
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AI summary
A display substrate and a display device are provided. The display substrate includes a base and subpixels arranged on the base in an array form. The subpixel includes: a data line pattern extending in a first direction; a power source signal line pattern including a portion extending in the first direction; and a subpixel driving circuitry. The subpixel driving circuitry includes two switching transistors, a driving transistor, and a storage capacitor. A first electrode plate of the storage capacitor is coupled to a gate electrode of the driving transistor, and a second electrode plate of the storage capacitor is coupled to the power source signal line pattern. Second electrodes of the two switching transistors are coupled to a first electrode of the driving transistor. An orthogonal projection of the second electrode of at least one of the two switching transistors onto the base at least partially overlaps an orthogonal projection of the power source signal line pattern onto the base, and at least partially overlaps an orthogonal projection of the second electrode plate of the storage capacitor onto the base.