Display Panel Pixel Circuit Shielding for Low-Frequency Black-State Stability
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Solution Overview
Problem
Display panels fail to maintain a black state during low-frequency mode due to improper wiring in the pixel driver circuit, leading to display non-uniformity and deteriorated quality.
Innovation Solution
Incorporation of a shielding component between connection lines in the pixel driver circuit to prevent coupling impacts on the potential of the drive transistor, using a DC voltage signal to maintain the black state during low-frequency operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the pixel driver circuit uses conventional wiring without shielding, then the device complexity is reduced, but the display uniformity deteriorates due to potential fluctuations in low-frequency mode
Solution Approach 1:
A shielding component is introduced as an intermediary element between the first connection line and the second connection line. This shielding component, configured to receive a DC voltage signal, blocks electromagnetic coupling between the two lines, preventing potential fluctuations that would otherwise occur in low-frequency mode. The shielding component acts as a mediator that isolates the sensitive drive transistor potential from interfering signals, thereby maintaining display uniformity without fundamentally changing the circuit's functional architecture.
2Area of stationary object
If connection lines are placed close together to reduce area, then the area is reduced, but electromagnetic coupling causes potential instability in the drive transistor
Solution Approach 1:
The shielding component serves as a physical and electromagnetic intermediary positioned between the first connection line (carrying AC coupling signals) and the second connection line (carrying DC potential). This intermediary structure allows the circuit lines to remain in close proximity for area efficiency while simultaneously blocking harmful electromagnetic coupling, thus maintaining both compact area and reliable potential stability.
Solution Approach 2:
The shielding component is applied locally at the critical region where electromagnetic coupling occurs between the two connection lines. Rather than shielding the entire circuit, the shielding is concentrated where needed - between the first and second connection lines - to prevent potential fluctuations in the drive transistor while maintaining overall circuit compactness and area efficiency.
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
Improves display uniformity and quality by preventing potential fluctuations in the pixel driver circuit, ensuring the display panel remains black in low-frequency mode.
Implementation Method 1
a shielding component configured to receive a direct current voltage signal. In a direction perpendicular to a plane of the substrate, the shielding component is located between the first connection line and the second connection line, and the shielding component, the first connection line, and the second connection line overlap with each other
Data Source
AI summary
A display panel and a display device. A pixel driver circuit includes a drive transistor, a light-emitting control transistor, and a transmission transistor. A light-emitting control scanning signal line is connected to a gate of the light-emitting control transistor and includes a first connection line. A second connection line includes a first end electrically connected to a first electrode of the drive transistor and a second end electrically connected to a first electrode of the transmission transistor. The light-emitting control transistor includes a first electrode electrically connected to a second electrode of the drive transistor and a second electrode electrically connected to a first electrode portion of a light-emitting element. A shielding component is configured to receive a direct current voltage signal. The shielding component is located between the first and second connection lines; and the shielding component, and the first and second connection lines overlap with each other.