Display Substrate Pixel Circuit With Overlapping Gates for Signal Control
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Solution Overview
Problem
Existing display technologies face challenges in optimizing the structure and functionality of display substrates for flexible OLED and QLED devices, particularly in achieving efficient signal control and power management through Thin Film Transistors (TFTs), which affect display performance and efficiency.
Innovation Solution
The display substrate incorporates a specific arrangement of transistors and capacitors, including oxide transistors and low-temperature polycrystalline silicon transistors, with overlapping gate electrodes and double-layer scan signal lines, forming a mesh structure for power and signal transmission, to enhance signal control and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional TFT structures are used in display substrates, then the device complexity is reduced and manufacturing is easier, but signal control efficiency and power management performance deteriorate
Solution Approach 1:
The pixel circuit is divided into multiple functional modules with dedicated transistors for initialization (first transistor), compensation (second transistor), driving (third transistor), data writing (fourth transistor), and reference voltage control (ninth transistor). Each transistor is strategically positioned and connected to specific capacitors and signal lines to perform discrete functions, improving signal control efficiency through functional segmentation.
Solution Approach 2:
The transistor arrangement utilizes three-dimensional spatial positioning on the substrate, with top gate electrodes extending in unit row direction and bottom gate electrodes positioned beneath active layers. The overlapping projections of gate electrodes create vertical layering that optimizes signal transmission paths and reduces interference, transforming a two-dimensional layout into an optimized three-dimensional structure.
2Use of energy by stationary object
If more transistors and capacitors are added to improve power management, then power consumption control improves, but device complexity increases
Solution Approach 1:
The first storage capacitor serves dual functions: storing initialization voltage for the pixel circuit and providing reference voltage storage. The second storage capacitor similarly provides both data voltage storage and compensation function. The ninth transistor serves as both a switch for reference voltage and a control element for capacitor charging/discharging. This multi-functionality reduces the need for additional components while improving power management.
Solution Approach 2:
The pixel circuit uses its own internal capacitors and transistors to perform self-initialization and self-compensation. The first transistor initializes the pixel circuit by charging the first storage capacitor, while the second transistor compensates for threshold voltage variations using the second storage capacitor. This self-service mechanism eliminates the need for external intervention and reduces overall system complexity.
3Speed
If top gate electrodes are extended to overlap with bottom gate electrodes, then signal transmission efficiency improves, but manufacturing precision requirements increase
Solution Approach 1:
The top gate electrodes are extended specifically in regions where they need to overlap with bottom gate electrodes to enhance signal transmission, while maintaining standard dimensions in other regions. The extension length and position are locally optimized based on signal transmission requirements, creating different structural qualities in different spatial locations of the same transistor.
Solution Approach 2:
The gate electrode structure transitions from conventional equal-length top and bottom gates to an asymmetric design where the top gate electrode length is increased to create overlap. This parameter change in electrode dimensions and positioning transforms the electrical characteristics, improving signal transmission speed through enhanced capacitive coupling between gates.
Data Source
AI summary
A display substrate includes a plurality of circuit units. Each circuit unit includes a pixel driving circuit. The pixel driving circuit at least includes a first transistor, a second transistor, a third transistor, a fourth transistor, a ninth transistor, a first storage capacitor and a second storage capacitor. A second electrode of the first transistor is connected to a first electrode of the second transistor, the gate electrode of the third transistor, and a first end of the first storage capacitor, respectively. A second electrode of the fourth transistor is connected to a second electrode of the ninth transistor, a second end of the first storage capacitor, and a second end of the second storage capacitor, respectively.