Display Driving Current Control with Adaptive Gain Switching
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Solution Overview
Problem
Unstable supply of output current to the driving voltage line in display devices can cause flicker and increase power consumption.
Innovation Solution
A display device and driving method that includes a current sensing circuit to monitor the output current, comparing it with a target current, and adjusting the output current using a first gain when the difference is significant and a second gain when the difference is minimal, employing fast and slow filter modes to stabilize the current supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If output current is supplied to the display panel without stable control, then the display panel can operate, but flicker occurs and power consumption increases
Solution Approach 1:
The patent implements a feedback control mechanism where the controller receives sensing current from the current sensing circuit, compares it with target current, and adjusts the output current accordingly. This closed-loop feedback system stabilizes the current supply to prevent flicker and reduce power consumption.
Solution Approach 2:
The patent dynamically changes the gain parameter of the current control based on the difference between sensing current and target current. When the difference is large, a first gain is applied; when the difference is small, a second gain is applied. This parameter adjustment optimizes the control response and stabilizes the output current.
2Reliability
If output current is supplied to the display panel without stable control, then the display panel can operate, but power consumption increases
Solution Approach 1:
The feedback control mechanism ensures that the output current is precisely controlled to match the target current, preventing energy waste from current fluctuations and instability. This reduces overall power consumption while maintaining stable operation.
Solution Approach 2:
By dynamically adjusting the control gain based on the current difference, the system optimizes power consumption during different operating conditions, reducing energy waste while maintaining stability.
3Reliability
If the controller adjusts output current continuously with high gain, then current stability improves, but response time and processing load increase
Solution Approach 1:
The patent implements dynamic gain adjustment where the controller switches between first gain and second gain based on the magnitude of current difference. This dynamic approach allows fast response when needed while maintaining stability through reduced gain when the system is already near the target state.
Solution Approach 2:
The controller changes the control parameter (gain) based on the operating condition. When the current difference is large, high gain is applied for rapid correction; when the difference is small, low gain is applied to avoid excessive processing and maintain response time.
Data Source
AI summary
Embodiments of the disclosure relate to a display device and a method for driving the same and, specifically, may stably supply current to the driving voltage line by controlling the output current by the first gain when the difference in magnitude between the sensing current and the target current is larger than the reference data and controlling the output current by the second gain when the difference in magnitude between the sensing current and the target current is the reference data or less.