5T1C Pixel Driving Circuit Reduces Leakage Power in Printed OLED
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Solution Overview
Problem
Printed OLED devices have low turn-on voltage and traditional pixel compensation circuits result in high leakage power consumption and low compensation accuracy.
Innovation Solution
A pixel driving circuit with a 5T1C structure, comprising specific transistors and a capacitor, is used to effectively compensate the threshold voltage of driving transistors, reducing leakage power consumption and improving compensation accuracy by independent control of electrical signals during different stages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional pixel compensation circuits are used in printed OLED devices, then the threshold voltage compensation function is provided, but the leakage power consumption increases and compensation accuracy decreases
Solution Approach 1:
The pixel circuit is divided into multiple transistors (first transistor for driving, second transistor for data writing, third transistor for reference signal, fourth transistor for reset, fifth transistor for light emitting control) with distinct functions. Each transistor operates in specific time stages to separate the compensation process from the light emitting process, preventing simultaneous conduction and reducing leakage current while maintaining compensation accuracy.
Solution Approach 2:
The pixel circuit operates in periodic time stages including: first reset stage (resetting second node), second reset stage (resetting first node), threshold voltage extraction stage (extracting and storing threshold voltage in capacitor), and data writing stage (writing data signal). This periodic operation ensures that the compensation function is performed at specific times while the light emitting element remains controlled, reducing continuous leakage power consumption.
2Use of energy by moving object
If the turn-on voltage of printed OLED devices is low, then the driving voltage requirement is reduced, but the leakage current increases when using traditional compensation circuits
Solution Approach 1:
The circuit utilizes the low turn-on voltage characteristic of printed OLED devices by carefully controlling the gate-source voltage of each transistor throughout different operating stages. The fifth transistor controlling the light emitting element is kept off during threshold voltage extraction, and its gate voltage is only activated during the data writing stage, thereby utilizing the low voltage capability while preventing leakage current through proper timing control.
Data Source
AI summary
A pixel driving circuit and a display panel are provided, and adopt a pixel driving circuit of 5T1C structure to effectively compensate the threshold voltage of the driving transistor in each pf the pixels. The pixel driving circuit can effectively reduce leakage power consumption of a pixel driving circuit when extracting a threshold voltage, thereby improving compensation accuracy of the pixel driving circuit.