Pixel Driving Circuit Combining Data Writing and Threshold Compensation
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Solution Overview
Problem
Existing pixel driving circuits compensate the threshold voltage of driving transistors before writing data voltage, leading to a complicated driving process.
Innovation Solution
A pixel driving circuit design that integrates threshold voltage compensation and data writing in a single phase, utilizing a storage capacitor to store the data voltage and threshold voltage of the driving transistor, and includes transistors controlled by various signals to simplify the driving process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If threshold voltage compensation is performed before data writing in the pixel driving circuit, then the display uniformity is improved by compensating for threshold voltage differences, but the driving process complexity increases
Solution Approach 1:
The patent merges the threshold voltage compensation process and data writing process into a single integrated phase. The storage capacitor simultaneously stores both the threshold voltage compensation value and the data voltage, eliminating the need for separate compensation and writing phases, thus reducing driving process complexity while maintaining display uniformity
Data Source
AI summary
A pixel driving circuit and a display panel are provided, the circuit includes a driving transistor connected to a first and third nodes; a first transistor connected to a second node to output a data voltage to the second node in response to a first scan signal; a second transistor connected to the first and third nodes; a fifth transistor connected to the second node to output a reference voltage to the second node in response to a first reset signal; a seventh transistor connected to the third and fourth nodes to electrically communicate the third node with the fourth node in response to a light emitting control signal; and a storage capacitor, connected to the first and second nodes to store the data voltage and a threshold voltage of the driving transistor.