Pixel Circuit Voltage Fluctuation Compensation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional display panels with pixel circuits suffer from poor display uniformity due to deviations in the power supply voltage affecting the drive current, leading to non-uniform luminance across the panel.
Innovation Solution
The pixel circuit incorporates a compensation circuit and a voltage controller to compensate for power supply voltage deviations and control voltage fluctuations at the gate electrode of the drive transistor, ensuring consistent drive current generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional pixel circuit is used, then the structure is simple, but the display uniformity is poor due to power supply voltage deviations affecting drive current
Solution Approach 1:
The patent introduces a compensation circuit that dynamically adjusts the threshold voltage of the drive transistor based on detected power supply voltage deviations. By changing the threshold voltage parameter in response to voltage variations, the circuit maintains stable drive current and improves display uniformity without requiring complete circuit redesign
Solution Approach 2:
The patent implements a feedback mechanism where the threshold voltage detection circuit continuously monitors the actual threshold voltage of the drive transistor and compares it with the reference threshold voltage. The compensation circuit then adjusts the gate voltage accordingly to compensate for any deviations caused by power supply voltage changes, creating a closed-loop control system that maintains display uniformity
2Stability of the object's composition
If the drive current is stabilized to improve display uniformity, then luminance consistency improves, but the circuit complexity increases due to additional compensation components
Solution Approach 1:
The patent employs a self-service approach where the threshold voltage detection circuit automatically measures the actual threshold voltage of the drive transistor and the compensation circuit autonomously adjusts the gate voltage to compensate for power supply variations. This self-regulating mechanism stabilizes drive current without requiring external intervention or complex control systems
Solution Approach 2:
The patent performs preliminary compensation by detecting and compensating for threshold voltage deviations before they affect the drive current during the light-emitting phase. The compensation circuit proactively adjusts the gate voltage in advance to prevent current instability, ensuring consistent luminance output
Data Source
AI summary
A pixel circuit, a display panel and a display device. The pixel circuit includes drive transistor, storage capacitor, compensation circuit, and voltage controller. The drive transistor has a gate electrode connected to a first node and generates a drive current in a light-emitting phase of an operation cycle of the pixel circuit. The storage capacitor has a first plate connected to the first node and a second plate connected to a second node and stores a data voltage inputted to the gate electrode of the drive transistor. The compensation circuit has an output terminal connected to the second node and a first input terminal receiving a first power supply voltage and compensates a deviation of the first power supply voltage affecting the drive current. The voltage controller is connected to the second node and controls a fluctuation of a voltage of the second node prior to the light-emitting phase.