Pixel Driving Circuit Threshold Voltage Compensation
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Solution Overview
Problem
Existing pixel driving circuits cannot achieve real-time compensation and a large compensation range for threshold voltage shifts, limiting their effectiveness in display technologies.
Innovation Solution
A pixel driving circuit incorporating an external detection module and an internal compensation module, which uses different timing sequences to compensate threshold voltage shifts based on their direction, allowing for accurate and extensive real-time compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If external compensation through IC is used, then compensation can be achieved, but real-time compensation cannot be realized and only once-after-powering-on compensation is possible
Solution Approach 1:
The pixel driving circuit performs self-compensation by detecting its own threshold voltage shift and adjusting compensation voltages automatically without requiring external IC intervention, enabling real-time compensation during display operation
Solution Approach 2:
The circuit detects the actual threshold voltage shift of the second transistor and uses this feedback information to dynamically adjust compensation voltages applied to the gate, creating a closed-loop real-time compensation mechanism
2Productivity
If internal compensation circuit is used, then real-time compensation can be achieved, but compensation range is limited by circuit architecture
Solution Approach 1:
The compensation mechanism is divided into two independent modules: external detection module for measuring threshold voltage shift and internal compensation module for applying compensation. This segmentation allows each module to be optimized independently, expanding the overall compensation range
Solution Approach 2:
The circuit dynamically selects different compensation voltages (first compensation voltage or second compensation voltage) based on the detected threshold voltage shift direction, enabling adaptive compensation across a wider range of threshold voltage variations
3Device complexity
If single timing internal compensation circuit is used, then circuit complexity is reduced, but batch-to-batch threshold voltage shift differences cannot be fully compensated
Solution Approach 1:
The circuit changes compensation parameters (compensation voltage magnitude and polarity) based on the detected threshold voltage shift direction, using a first compensation voltage for positive shifts and a second compensation voltage for negative shifts, thereby accommodating batch-to-batch variations
Data Source
AI summary
A pixel driving circuit and a display panel are provided. The pixel driving circuit includes a light-emitting module, an external detection module, and an internal compensation module. The light-emitting module is electrically connected to the external detection module and the internal compensation module. The external detection module is configured to acquire a threshold voltage of a second transistor when a display panel is turned on, and determine a shift direction of the threshold voltage. When the shift direction of the threshold voltage is a positive shift, the pixel driving circuit uses a first timing sequence to compensate the threshold voltage. When the shift direction of the threshold voltage is a negative shift, the pixel driving circuit uses a second timing sequence to compensate the threshold voltage.