Dynamic Bias Current Adjustment in Data Driving Circuits
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Solution Overview
Problem
Current display panel driving chips for current-driving type displays have high power consumption due to fixed bias currents that need to accommodate maximum pixel currents, leading to increased power usage and redundant bias currents for smaller pixel currents.
Innovation Solution
A data driving circuit with a pixel current generation circuit and an operational amplifier that adjusts bias current based on data voltage, ensuring each pixel current corresponds to a respective bias current, reducing power consumption while maintaining system stability by dynamically adjusting the operational amplifier's poles in the two-pole system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed bias current is used in the operational amplifier to ensure stability for maximum pixel current, then the stability of the operational amplifier is improved, but the power consumption increases
Solution Approach 1:
The patent implements dynamic bias current adjustment by making the bias current proportional to the data voltage through the pixel current generation circuit. The operational amplifier's bias current changes dynamically based on the input signal level rather than remaining fixed, thereby adapting to different operating conditions and reducing power consumption when pixel current requirements are low while maintaining stability when needed.
Solution Approach 2:
The patent changes the bias current parameter of the operational amplifier from a fixed value to a variable value that depends on the data voltage. By adjusting the bias current parameter in proportion to the pixel current requirements, the system achieves both stability and power efficiency across different grayscale levels and operating conditions.
2Adaptability or versatility
If a large fixed bias current is used to accommodate maximum pixel current, then the operational amplifier can handle peak demands, but redundant bias current is consumed during normal operation
Solution Approach 1:
The system transitions from a static bias current design to a dynamic one where the bias current adapts to the actual pixel current requirements. The pixel current generation circuit ensures that the bias current matches the instantaneous demand, eliminating the waste of redundant current during normal operation while maintaining the ability to handle peak demands when necessary.
Solution Approach 2:
The operational amplifier's bias current is automatically adjusted based on the input signal level through the pixel current generation circuit. The system self-regulates the bias current to match the actual operating conditions without external intervention, thereby eliminating redundant current consumption while maintaining adequate headroom for peak demands.
Data Source
AI summary
Provided is a data driving circuit, including: a pixel current generation circuit including an input terminal and an output terminal and configured to generate a pixel current based on a data voltage inputted via the input terminal, wherein the output terminal of the pixel current generation circuit is configured to be connected to a pixel circuit; and a first operational amplifier including a first input terminal connected to the output terminal of the pixel current generation circuit, a second input terminal, and an output terminal. A first voltage is inputted via the second input terminal of the first operational amplifier and is positively related to the data voltage, and the output terminal of the first operational amplifier is configured to be connected to the pixel circuit; and wherein the first operational amplifier is configured to generate a bias current based on the first voltage.