Shield Electrode Stabilizes Drive Transistor at High Scan Frequencies
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Solution Overview
Problem
Existing display substrates face challenges in stabilizing the operating performance of drive transistors, particularly at high scanning frequencies and high resolutions, due to the influence of voltage jumps from scan signals on the gate electrodes of drive transistors.
Innovation Solution
The display substrate incorporates a first shield electrode connected with the first power supply line, with its orthographic projection partially overlapping with the scan signal line. This configuration effectively shields the voltage jump of the scan signal, ensuring stable operation of the drive transistor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If scan signal lines are used to supply scan signals to circuit units, then scanning operation is enabled, but voltage jumps from scan signals affect gate electrodes of drive transistors, deteriorating operating performance stability
Solution Approach 1:
A shield electrode is introduced as an intermediary element between the scan signal line and the gate electrode of the drive transistor. The shield electrode is connected to a reference potential (ground or power supply line) and positioned to overlap with both the scan signal line and the gate electrode in the planar view. This intermediary structure captures and redirects the voltage jump interference from the scan signal line, preventing it from directly affecting the gate electrode and thus maintaining stable transistor operation at high scanning frequencies.
2Reliability
If shield electrode is added to stabilize drive transistor operation, then operating performance stability is improved, but device complexity increases
Solution Approach 1:
The shield electrode is merged with existing conductive structures in the display device. It is connected to either the ground line or power supply line that already exists in the circuit, rather than requiring a completely separate potential reference structure. This merging approach allows the shield electrode to be formed using the same conductive material layers and patterning processes as the existing circuit elements, thereby reducing additional manufacturing steps and material usage while still providing effective shielding.
Solution Approach 2:
The shield electrode serves multiple functions simultaneously: it acts as an electrostatic shield to protect the gate electrode from voltage jumps, functions as a reference potential connection point, and can be integrated with existing ground or power supply networks. This multi-functionality reduces the need for separate dedicated structures for each function, thereby limiting the increase in device complexity while achieving reliable shielding效果.
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 implementation of the first shield electrode significantly stabilizes the operating performance of the drive transistor, enhancing the display effect by reducing the impact of voltage jumps on the gate electrodes, thus supporting high-frequency and high-resolution displays.
Implementation Method 1
a first shield electrode connected with the first power supply line, an orthographic projection of the first shield electrode on a plane of the display substrate is at least partially overlapped with an orthographic projection of the scan signal line on the plane of the display substrate
Data Source
AI summary
A display substrate and a manufacturing method therefor, and a display apparatus are provided. The display substrate includes a plurality of circuit units, a scan signal line for providing a scan signal for the circuit units, and a first power supply line (51) for providing a power supply signal; wherein at least one circuit unit includes a pixel drive circuit, the pixel drive circuit includes a first shield electrode (34), which is connected to the first power supply line (51), an orthographic projection of the first shield electrode (34) on a plane of the display substrate at least partially overlaps an orthographic projection of the scan signal line on the plane of display substrate.