Pixel Power Supply Compensation for Threshold Voltage Variation
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Solution Overview
Problem
Conventional pixel circuits in electronic devices face challenges due to transistors with varying threshold voltages, leading to inconsistencies in driving voltage or current, necessitating a compensation circuit to ensure accurate power supply.
Innovation Solution
An electronic device incorporating a compensation circuit with a precharge unit, sampling unit, and detection unit, positioned in the peripheral area, which compensates the power supply circuit by adjusting voltage and current to mitigate the impact of transistor threshold voltages on the load element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a power supply circuit is designed without compensation, then the device complexity is reduced, but the reliability of driving voltage or current becomes poor due to transistor threshold voltage variations
Solution Approach 1:
The pixel circuit is divided into two separate areas: the active area containing the load element and power supply circuit, and the peripheral area containing the compensation circuit. This segmentation allows the compensation function to be isolated from the main pixel circuit, improving driving voltage consistency without significantly increasing the complexity of the core pixel circuit.
Solution Approach 2:
A compensation circuit is introduced as an intermediary component between the power supply circuit and the load element. This compensation circuit measures and compensates for threshold voltage variations, ensuring consistent driving voltage or current to the load element while maintaining a relatively simple overall circuit structure.
2Ease of manufacture
If transistors with different threshold voltages are used, then the ease of manufacture is improved, but the manufacturing precision of driving voltage or current deteriorates
Solution Approach 1:
The compensation circuit implements a feedback mechanism that measures the actual threshold voltage of transistors and adjusts the driving signal accordingly. This feedback loop ensures that even though transistors have different threshold voltages due to manufacturing variations, the final driving voltage or current delivered to the load element maintains high precision and consistency.
3Reliability
If a compensation circuit is added to the pixel circuit, then the reliability of power supply is improved, but the area of the substrate increases
Solution Approach 1:
The compensation circuit is placed specifically in the peripheral area of the substrate, while the active area maintains its original compact design. This local placement strategy ensures that the reliability of power supply is improved through compensation, while the impact on the overall substrate area is minimized by confining the compensation components to the peripheral region.
Data Source
AI summary
An electronic device includes a substrate, a load element, a power supply circuit, and a compensation circuit. The substrate includes an active area and a peripheral area. The peripheral area is adjacent to the active area. The load element is disposed on the substrate and disposed in the active area. The power supply circuit is disposed on the substrate and disposed in the active area. The power supply circuit is electrically connected to the load element. The compensation circuit is disposed on the substrate and disposed in the peripheral area. The compensation circuit compensates the power supply circuit and/or the load element.