7T3C Pixel Driving Circuit Threshold Compensation
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Solution Overview
Problem
Current OLED pixel driving circuits have complex compensation structures, making operation difficult and resulting in short light-emitting times, which affects the brightness and lifespan of OLED display panels.
Innovation Solution
A 7T3C pixel driving circuit structure is introduced, utilizing multiple transistors and capacitors to effectively compensate for threshold voltage drift, simplifying the compensation structure and extending light-emitting times by enabling light emission during programming and illumination phases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a compensation structure is added to compensate for threshold voltage drift, then the stability of the driving transistor is improved, but the device complexity increases and operation becomes difficult
Solution Approach 1:
The compensation function is segmented into multiple distinct phases (initialization, threshold voltage detection, data signal input, programming, and illumination phases) controlled by different control signals. Each phase performs a specific compensation or driving function, dividing the complex compensation task into manageable sequential steps that simplify the overall operation while maintaining effectiveness.
2Reliability
If a complex compensation structure is used, then the threshold voltage drift is compensated, but the light-emitting time becomes short
Solution Approach 1:
The pixel driving circuit operates through periodic cycles comprising multiple phases (initialization, threshold voltage detection, data signal input, programming, and illumination phases). The compensation operations are performed periodically at specific phases within each cycle, allowing the light-emitting device to emit light during designated illumination phases while threshold voltage drift is compensated during other phases of the same periodic cycle, thus maintaining both compensation effectiveness and adequate light-emitting duration.
3Reliability
If multiple control signals are used to manage the compensation structure, then the threshold voltage compensation is effective, but the operational difficulty increases
Solution Approach 1:
The pixel driving circuit automatically performs threshold voltage detection and compensation operations during specific phases without requiring external manual intervention. The circuit uses its own internal components (transistors, capacitors) and control signals to self-regulate and self-compensate for threshold voltage drift, making the operation autonomous and simplifying the overall control process despite using multiple control signals.
Data Source
AI summary
A pixel driving circuit and a display panel are provided. The pixel driving circuit uses a 7T3C structure to effectively compensate a threshold voltage of a driving transistor in each pixel, a compensation structure of the pixel driving circuit is relatively simple, and operation difficulty is low. Moreover, a light emitting device emits light during a programming phase and an illumination phase, which increases light emitting time of the light emitting device, thereby improving a brightness and a life of the display panel.