AMOLED Pixel Driving Circuit Layout for Uniform Light Emission
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Solution Overview
Problem
Active matrix organic light emitting diode (AMOLED) panels face challenges in achieving uniformity of image quality and brightness due to variations in pixel display devices, particularly in the initialization and driving of light emitting devices.
Innovation Solution
A display substrate with a pixel driving circuit that includes a driving module, reset modules, input module, light emitting control modules, and a compensation module, along with specific transistor and capacitor configurations, to manage node voltages and threshold voltages for consistent light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If complex pixel driving circuits are used to drive sub-pixels, then the driving capability is improved, but the circuit complexity increases leading to potential inconsistencies in light emission
Solution Approach 1:
The pixel driving circuit is divided into multiple functional modules: a driving module for current generation, a first reset module for initializing the anode voltage, and a second reset module for initializing the transistor gate voltage. This segmentation allows each module to perform its specific function independently, reducing the complexity of the overall circuit while maintaining complete driving capability.
Solution Approach 2:
The reset modules perform preliminary initialization actions before the driving module operates. The first reset module initializes the anode voltage to a known state, and the second reset module initializes the transistor gate voltage, ensuring that the driving module starts from a consistent state each time, thereby eliminating inconsistencies in light emission.
2Measurement precision
If multiple reset modules are added to initialize voltage levels, then the initialization accuracy is improved, but the device complexity increases
Solution Approach 1:
The initialization function is segmented into two separate reset modules, each responsible for a specific voltage node. The first reset module handles the anode voltage initialization, while the second reset module handles the transistor gate voltage initialization. This segmentation allows for more accurate and independent control of each voltage level without requiring a single complex reset circuit.
Solution Approach 2:
The reset modules act as intermediary circuits between the control signals and the voltage nodes they initialize. By introducing these intermediary reset modules, the patent achieves precise voltage initialization without directly manipulating the voltage nodes, thereby improving initialization accuracy while keeping the overall circuit structure manageable.
Data Source
AI summary
The present disclosure relates to the technical field of display. Provided are a display substrate and a display panel. The display substrate comprises a plurality of sub-pixels, wherein each sub-pixel comprises a pixel driving circuit and a light emitting device, which are electrically connected to each other; the pixel driving circuit comprises a driving module, a first reset module, a second reset module, an input module, a first light-emission control module, a second light-emission control module, and a compensation module; the pixel driving circuit comprises a plurality of transistors, and each transistor comprises an active portion. The display substrate further comprises a plurality of conductive patterns, wherein orthographic projections of active portions of all the transistors in at least one of the sub-pixels on a base are all located within orthographic projections of the conductive patterns on the base. The display substrate is used for preparing a display panel.