Display Device Power Management Circuit Voltage Mode Switching
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Solution Overview
Problem
Conventional display devices consume high power due to constant driving voltage provision to data drivers during both active and blank periods, leading to increased current consumption.
Innovation Solution
A display device with a power management circuit that generates different voltage levels for normal and low power modes, using a first driving voltage in normal mode and a parking voltage and a second driving voltage in low power mode, controlled by a driving controller to reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power management circuit generates and provides the same driving voltage to the data driver during both active and blank periods, then the display device can maintain stable operation, but the current consumption and power consumption increase
Solution Approach 1:
The power management circuit dynamically switches between two operating modes: normal mode during active periods where full driving voltage is provided to the data driver, and low power mode during blank periods where a reduced voltage is provided. This dynamic adaptation allows the system to maintain stable operation when needed while reducing power consumption during idle periods, directly resolving the contradiction between reliability and energy usage.
Solution Approach 2:
The patent changes the voltage parameter provided to the data driver based on the operational period. During active periods, the full driving voltage is applied to ensure proper display operation. During blank periods, the voltage parameter is reduced to a lower level, which significantly decreases current consumption while still maintaining the ability to quickly resume normal operation when needed, thus resolving the contradiction between stable operation and power consumption.
2Speed
If the power management circuit provides full driving voltage during blank period, then the display device can quickly resume operation, but the current of the display panel increases
Solution Approach 1:
The system dynamically adjusts the voltage level provided to the data driver based on the operational state. During blank periods, a reduced voltage is applied which lowers the current consumption. When operation needs to resume, the system quickly switches back to full driving voltage, enabling fast resumption while minimizing current draw during the blank period itself.
Solution Approach 2:
The power management circuit operates periodically, alternating between normal mode during active periods and low power mode during blank periods. This periodic switching allows the system to accept higher current only when necessary (during active display periods) while reducing current during blank periods, thus resolving the contradiction between resume speed and current quantity.
3Use of energy by moving object
If the power management circuit generates different voltages for normal and low power modes, then the power consumption is reduced, but the device complexity increases
Solution Approach 1:
The power management circuit is segmented into two distinct voltage generation paths: one for normal mode operation and one for low power mode operation. Each path is optimized for its specific function, with the normal mode path providing full driving voltage and the low power mode path providing reduced voltage. This segmentation allows the system to reduce power consumption while keeping each segment relatively simple, managing the overall complexity.
Solution Approach 2:
The power management circuit is designed with multi-functionality, serving both normal operation and low power operation from a single integrated circuit. By incorporating both voltage generation capabilities within one circuit that can switch between modes, the patent avoids the need for completely separate circuits for each mode, thus reducing device complexity while still achieving power consumption reduction through different voltage levels.
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
The solution effectively reduces power consumption by managing current usage based on operational modes, optimizing power management in display devices.
Implementation Method 1
a first voltage converter which converts the first driving voltage into a parking voltage lower than the first driving voltage
Implementation Method 2
a second voltage converter which converts the first driving voltage into a second driving voltage
Data Source
AI summary
A display device comprises a display panel including a pixel connected to a data line, a power management circuit including a first voltage generating circuit which generates a first driving voltage and provides the first driving voltage to a data driver in a normal mode, a first voltage converter which generates a parking voltage less than the first driving voltage and provides the parking voltage to the data driver in a low power mode, and a second voltage converter which generates a second driving voltage and provides the second driving voltage to the data driver in the low power mode, and a driving controller configured to receive input image data and to control the data driver and the power management circuit. The data driver provides a data voltage to the data line in the normal mode and provides the parking voltage to the data line in the low power mode.