Transparent OLED Display Substrate with Segmented Scanning Signal Lines
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Solution Overview
Problem
Existing transparent OLED display devices face issues such as low resolution, low transparency, and high signal line defects, particularly in large-size displays, with current repair methods failing to address all signal lines effectively, leading to reduced yield rates.
Innovation Solution
A display substrate design featuring a repeating unit structure with a display region and light-transmitting region, incorporating a pixel driving circuit with transistors and a storage capacitor, where gate electrodes of first and third transistors are connected to a common scanning signal line, and a scanning signal line extends through both regions with a single-line and double-line structure, enhancing connectivity and repairability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional pixel driving circuit structure is used in transparent OLED displays, then the display can achieve basic image display function, but the signal line defect repair capability is insufficient and yield rate is low
Solution Approach 1:
The scanning signal line is segmented into a first scanning signal line extending along a first direction and a second scanning signal line extending along a second direction perpendicular to the first direction. This segmentation allows independent repair of different scanning signal lines without affecting the entire display substrate, thereby improving repair capability and yield rate.
Solution Approach 2:
A compensation signal line is introduced as an intermediary component to compensate for threshold voltage drift in the transistor. The compensation signal line receives a compensation signal that adjusts the threshold voltage, ensuring stable display performance even when signal line defects occur, thereby improving reliability.
2Measurement precision
If transparent OLED technology is used to achieve light transmission and image display, then transparency is improved, but resolution and signal line defect rate deteriorate in large-size displays
Solution Approach 1:
The pixel driving circuit is arranged in a multi-dimensional pattern with scanning signal lines extending in multiple directions (first direction and second direction perpendicular to it). This dimensional arrangement allows for better signal distribution and easier defect detection/repair in large-size displays, improving both resolution and reliability.
Solution Approach 2:
The gate electrode is divided into a first gate electrode and a second gate electrode with different functions. The first gate electrode controls the main current flow while the second gate electrode provides additional control for compensation. This parameter change in the transistor structure enables better performance in large-size transparent displays with improved resolution and lower defect rates.
3Ease of manufacture
If a simple pixel driving circuit is used, then manufacturing complexity is reduced, but the ability to compensate for signal line defects and maintain display quality deteriorates
Solution Approach 1:
The pixel driving circuit is designed with multi-functionality to handle both normal display operation and defect compensation. The circuit includes transistors with multiple gate electrodes that can function in different modes: normal driving mode for image display and compensation mode for correcting threshold voltage drift. This universal design maintains display quality stability without significantly increasing manufacturing complexity.
Solution Approach 2:
A feedback mechanism is implemented through the compensation signal line that monitors display quality and adjusts the threshold voltage accordingly. The feedback loop detects deviations in display performance and automatically compensates by adjusting the gate voltage, maintaining stable display quality while using a relatively simple circuit structure.
Data Source
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AI summary
Embodiments of the present disclosure provide a display substrate and a manufacturing method therefor, and a display device. The display substrate comprises a plurality of repeating units, and each repeating unit comprises a display region and a light-transmitting region; the display region comprises a plurality of sub-pixels, and each sub-pixel comprises a pixel driving circuit; the pixel driving circuit comprises a first transistor, a second transistor, a third transistor, and a storage capacitor; a first electrode of the first transistor is connected to a data signal line, and a second electrode of the first transistor is connected to a gate electrode of the second transistor and a first end of the storage capacitor, respectively; a first electrode of the second transistor is connected to a first power line, and a second electrode of the second transistor is connected to a second electrode of the third transistor and a second end of the storage capacitor, respectively; a first electrode of the third transistor is connected to a compensation signal line; in at least one sub-pixel, a gate electrode of the first transistor and a gate electrode of the third transistor are connected to a same scanning signal line.