Power Management Circuit for Display Voltage Ripple Control
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Solution Overview
Problem
Ripple in the analog power voltage provided to the data driver of a display device leads to reduced display quality and increased power consumption.
Innovation Solution
A power management circuit that measures load current and adjusts the voltage level of the analog power voltage based on the load current during a blank period to prevent undershoot and ripple, using a voltage converter and load sensor to control the voltage level.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the voltage level of the analog power voltage is increased to prevent undershoot during the active period, then the display quality is improved, but the power consumption increases
Solution Approach 1:
The power management circuit increases the voltage level of the analog power voltage at a first increase time point within the blank period before the active period starts. This preliminary action ensures that the voltage level is sufficient to prevent undershoot during the active period, thereby maintaining display quality without requiring continuously high voltage levels that would increase power consumption.
Solution Approach 2:
The circuit applies periodic voltage adjustments by increasing the analog power voltage level at specific time points within the blank period based on the load current. This periodic control strategy maintains reliable display operation during active periods while minimizing power consumption during blank periods when the load is lower.
2Reliability
If the voltage level of the analog power voltage is maintained at a high level to reduce ripple, then the display quality is improved, but the power consumption increases
Solution Approach 1:
The power management circuit dynamically adjusts the voltage level of the analog power voltage based on the measured load current. During the blank period, the circuit increases the voltage level at a first increase time point according to the load current magnitude, ensuring sufficient voltage to reduce ripple during the active period while avoiding continuously high voltage levels that would waste power.
3Reliability
If the voltage level is increased at an earlier time point within the blank period, then the ripple is reduced more effectively, but the power consumption increases
Solution Approach 1:
The circuit performs preliminary voltage increase at a first increase time point within the blank period, which is determined based on the load current. This timing ensures that the voltage level is raised early enough to effectively reduce ripple during the active period, while not increasing it too early or too long, thereby optimizing power consumption.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Reduces power consumption and improves display quality by preventing undershoot and ripple in the analog power voltage.
Implementation Method 1
a voltage converter which converts an input voltage receiving through an input terminal into the analog power voltage
Implementation Method 2
an inductor connected between the input terminal and a node
Data Source
AI summary
A display device includes a display panel which displays an image, a data driver which provides a data voltage to the display panel, and a power management circuit which provides an analog power voltage to the data driver through an output terminal. The power management circuit measures a load current output through the output terminal, and increases a voltage level of the analog power voltage based on the load current at a first increase time point within a blank period.