OLED Pixel Driving Circuit Voltage Stabilization via Segmented Capacitors
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The pixel driving circuit in OLED displays experiences unstable gate voltage due to capacitor leakage, leading to uneven display issues.
Innovation Solution
A pixel driving circuit with a voltage stabilizing storage device comprising at least two capacitors connected in parallel, where a switch device is included between the capacitors and the driving device, allowing for flexible configuration of effective voltage stabilization periods to reduce leakage and stabilize the control terminal voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single storage capacitor is used to store the data signal voltage, then the circuit structure is simple, but the capacitor leakage causes unstable gate voltage of the driving transistor
Solution Approach 1:
The single storage capacitor is divided into multiple storage capacitors (first storage capacitor and second storage capacitor) connected in parallel. This segmentation reduces the leakage impact on each individual capacitor while maintaining the overall storage function, thereby stabilizing the gate voltage of the driving transistor without significantly increasing circuit complexity.
Solution Approach 2:
Multiple storage capacitors are combined in parallel configuration to share the storage burden. The combined capacitance provides sufficient charge storage while the distributed architecture reduces the relative impact of leakage from any single capacitor, achieving both stability and reasonable complexity.
2Reliability
If the gate voltage of the driving transistor is unstable due to capacitor leakage, then the transistor can still function, but the brightness of the light-emitting component is affected causing uneven display
Solution Approach 1:
By segmenting the storage capacitor into multiple parallel capacitors, the gate voltage stability is improved, which directly addresses the root cause of brightness不均匀. Each capacitor contributes to maintaining stable voltage, reducing display uniformity issues.
3Reliability
If at least two voltage stabilizing storage sub-devices are used connected in parallel, then the leakage is distributed and voltage stability is improved, but the device complexity increases
Solution Approach 1:
The storage function is segmented across multiple parallel capacitors, improving voltage stability through distributed charge storage. The segmentation approach allows each capacitor to handle a portion of the storage burden, reducing individual leakage impact.
Solution Approach 2:
Multiple capacitors are merged in parallel to achieve the desired stability while sharing the complexity burden. The parallel configuration allows the system to benefit from increased reliability without requiring a completely redesigned complex architecture.
Data Source
AI summary
Provided are a pixel driving circuit, a driving method, a display panel and a display device. The pixel driving circuit includes: a data writing device, a voltage stabilizing storage device, a driving device and a light-emitting component; where the data writing device is configured for transmitting a data signal voltage; the driving device is configured for generating a driving current according to the data signal voltage transmitted by the data writing device; the voltage stabilizing storage device is configured for storing the data signal voltage transmitted to the driving device; the light-emitting component is configured for emitting light in response to the driving current generated by the driving device; where the voltage stabilizing storage device includes at least two voltage stabilizing storage sub-devices connected in parallel, each voltage stabilizing storage sub-device includes a capacitor, at least one of the voltage stabilizing storage sub-devices includes a switch device.