Pixel Driving Circuit Stability via Dual Light Emitting Control
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Solution Overview
Problem
Conventional pixel driving circuits have poor stability, affecting their driving effect on light emitting elements in self-luminous display devices such as OLEDs and QLEDs, leading to suboptimal performance.
Innovation Solution
A pixel driving circuit comprising a pulse width modulation device, an amplitude modulation device, a first light emitting control device, a second light emitting control device, a drive transistor, and a light emitting element, where the first light emitting control device transmits a floating signal to the drive transistor for a predetermined time, allowing the second light emitting control device to control the driving current to the light emitting element, thereby improving stability and driving efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional pixel driving circuit is used, then the circuit structure is simple, but the stability in driving light emitting elements is poor
Solution Approach 1:
The light emitting control device is divided into two separate devices: a first light emitting control device that controls the transmission of floating signal to the gate, and a second light emitting control device that controls the transmission of driving current to the light emitting element. This segmentation allows independent optimization of each control function, improving overall stability without excessive complexity increase.
Solution Approach 2:
The first light emitting control device activates in advance to control the floating signal transmission to the gate before the light emitting element is driven. This preliminary action stabilizes the gate voltage conditions beforehand, ensuring more reliable subsequent driving of the light emitting element by the second control device.
2Reliability
If the light emitting element is driven immediately after voltage application, then the response speed is fast, but voltage fluctuations cause instability
Solution Approach 1:
The first light emitting control device performs preliminary control by managing the floating signal transmission to the gate before the actual light emitting驱动 occurs. This preliminary action allows voltage fluctuations to settle, and when combined with the second control device's subsequent current control, achieves both stability and timely response.
Solution Approach 2:
The first light emitting control device acts as an intermediary between the signal input and the light emitting element驱动. It mediates the voltage transitions by controlling floating signal transmission, filtering out harmful fluctuations before they reach the light emitting element, thus improving stability without significant time loss.
3Productivity
If a single light emitting control device is used, then the device complexity is low, but the driving effectiveness is insufficient
Solution Approach 1:
The single light emitting control device function is segmented into two specialized devices: one for controlling signal transmission to the gate (first device) and another for controlling driving current to the light emitting element (second device). This functional segmentation improves driving effectiveness by providing dedicated control for each critical interface.
Solution Approach 2:
Each control device is designed with specific control signals (first control signal for the first device, second control signal for the second device) that allow them to perform their specialized functions independently. This multi-functionality approach enables precise control without requiring a single complex device to handle all control aspects.
Data Source
AI summary
A pixel driving circuit and a driving method thereof, a display panel and a display device are provided. A second light emitting control device controls, in a case that a first light emitting control device controls a floating signal to be transmitted to a gate of a drive transistor for a first predetermined time period, a driving current to be transmitted to a light emitting element, and the light emitting element can emit light. In this way, the light emitting element can be driven to emit light after a fluctuation period of a voltage of the gate of the drive transistor during which the floating signal is initially inputted to the gate of the drive transistor is passed, improving the stability of the pixel driving circuit in driving the light emitting element.