AMOLED Pixel Structure with Segmented Driving Transistors
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Solution Overview
Problem
Active Matrix Organic Light Emitting Diode (AMOLED) display technologies face challenges in efficiently driving multiple light emitting devices with different colors, leading to issues like color offset and luminance decay, which affect display quality and longevity.
Innovation Solution
A pixel structure with a driving method that includes a pixel circuit with a driving transistor, storage capacitor, write compensation sub-circuit, reset sub-circuits, and light emitting control sub-circuits, allowing for direct electrical connections between the transistor and light emitting devices, and a driving method with stages for initialization, data writing, and light emission, enabling simultaneous and controlled operation of multiple light emitting devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional pixel circuit drives multiple light emitting devices, then the display resolution can be improved, but color offset and luminance decay occur affecting display quality
Solution Approach 1:
The pixel circuit is divided into multiple independent driving transistors (first driving transistor T31, second driving transistor T32, third driving transistor T33) that can independently control different light emitting devices. This segmentation allows each transistor to be optimized for specific color channels, reducing color offset while maintaining high display resolution through precise individual control of multiple sub-pixels.
Solution Approach 2:
A reset stage is introduced before the light emitting stage to pre-charge the light emitting devices to a predetermined voltage level. This preliminary action ensures that all light emitting devices start from the same initial state, preventing luminance decay and color offset during the subsequent light emitting phase, thereby maintaining display quality while driving multiple devices.
2Productivity
If multiple light emitting devices are driven simultaneously, then display performance is improved, but color offset and luminance decay increase
Solution Approach 1:
Each light emitting device is assigned its own dedicated driving transistor and control circuitry. The first driving transistor T31 controls the first light emitting device, the second driving transistor T32 controls the second light emitting device, and so on. This local quality approach ensures that each device receives precisely tailored driving signals, eliminating color offset and luminance decay caused by shared control, while maintaining high display performance through simultaneous operation of all devices.
Solution Approach 2:
The reset stage performs preliminary charging of all light emitting devices to a standardized voltage level before simultaneous light emission. This preliminary action equalizes the initial state of all devices, ensuring accurate color reproduction and preventing luminance decay during simultaneous operation, thereby improving both color accuracy and display performance.
3Device complexity
If the pixel circuit structure is simplified, then device complexity is reduced, but control precision over multiple light emitting devices deteriorates
Solution Approach 1:
The pixel circuit adopts a segmented architecture where each light emitting device has its own dedicated driving transistor (T31, T32, T33) and control pathways. This segmentation maintains control precision by providing individual control channels for each device, while the overall structure remains relatively simple compared to fully integrated control schemes, achieving a balance between device complexity and control precision.
Solution Approach 2:
The pixel circuit uses a universal reset stage that can simultaneously reset all light emitting devices to a standard voltage level, and a universal scanning mechanism that sequentially activates different transistor groups. This multi-functionality allows a single reset circuit and scanning system to serve multiple light emitting devices, reducing overall device complexity while maintaining precise individual control through the dedicated transistors.
Data Source
AI summary
A pixel structure, a driving method thereof and a display device are disclosed. The pixel structure includes: a pixel circuit and a plurality of light emitting devices; the pixel circuit has a plurality of display periods, each display period includes: a first reset stage, a data write stage, a second reset stage and a light emitting stage, the driving method includes: in the second reset stage, providing a valid level signal to at least one second reset line to cause the corresponding second reset sub-circuit to write a voltage on the initialization signal line into a first electrode of the light emitting device; in the light emitting stage, providing a valid level signal to a first light emitting control line and providing a valid level signal to at least one second light emitting control line.