Pause Driving Voltage Control for LCD Power Reduction
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Solution Overview
Problem
Despite the reduction in power consumption achieved by pause driving in liquid crystal display devices, there is a growing demand for further power savings due to increased resolution and usage time, particularly in portable devices.
Innovation Solution
A display device and method that adjusts operation voltages based on a control signal indicating whether the current time is a scanning period or a pause period, reducing voltage values during the pause period to minimize power consumption, and utilizing a power supply circuit to generate specific voltages for the display driving unit, including video and scanning signal line drive circuits, and a timing control circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If pause driving is implemented to reduce power consumption, then power consumption decreases, but display quality may deteriorate due to prolonged pause periods
Solution Approach 1:
The patent applies dynamics by making the pause period adjustable rather than fixed. The control unit dynamically changes the pause period length based on whether a still image or moving image is being displayed. For still images, longer pause periods are used to maximize power savings, while for moving images, shorter pause periods maintain display quality. This dynamic adaptation resolves the contradiction between power consumption reduction and display quality maintenance.
Solution Approach 2:
The patent changes the parameter of pause period duration based on display content type. By detecting whether the displayed content is a still image or moving image, the system adjusts the pause period parameter accordingly. This parameter change allows the system to optimize power consumption for still images while preventing display quality deterioration for moving images, thus resolving the technical contradiction.
2Loss of energy
If the pause period is extended to reduce power consumption, then energy savings increase, but image quality degradation occurs
Solution Approach 1:
The system dynamically adjusts the pause period duration based on the type of image being displayed. For still images, the pause period is extended to maximize energy savings. For moving images, the pause period is shortened or eliminated to maintain image quality. This dynamic control resolves the contradiction between energy savings and image quality by adapting the pause period to the specific display content.
Solution Approach 2:
The patent implements parameter changes by modifying the pause period duration according to whether still or moving images are displayed. The control unit detects the image type and adjusts the pause period parameter accordingly, enabling the system to achieve maximum energy savings for still images while preventing image quality degradation for moving images.
3Use of energy by moving object
If voltage is reduced during pause period to minimize power consumption, then power consumption decreases, but signal integrity may be compromised
Solution Approach 1:
The patent applies periodic action by alternating between normal driving mode and pause driving mode based on the display content. During pause periods, voltage is reduced to minimize power consumption. The system periodically restores full voltage when moving images are detected or when the pause period ends, ensuring signal integrity is maintained when needed. This periodic switching resolves the contradiction between power consumption reduction and signal integrity preservation.
Solution Approach 2:
The system changes the voltage parameter during pause periods to reduce power consumption, while maintaining sufficient voltage levels to preserve signal integrity. The control unit adjusts voltage levels dynamically based on whether still or moving images are displayed, ensuring that signal integrity is not compromised while achieving power consumption reduction during appropriate pause periods.
Data Source
AI summary
An object of the present invention is to further reduce the power consumption of a display device adopting pause driving. In a display device that includes a display driving unit (30) that drives a display unit (400); and a power supply circuit (20) that generates a plurality of operation voltages to be supplied to the display driving unit (30), and performs pause driving that repeats a scanning period during which gate bus lines (GL) are scanned and a pause period during which the scanning of the gate bus lines (GL) is stopped, the display driving unit (30) provides a control signal (SM) indicating whether the current point in time is the scanning period or the pause period, to the power supply circuit (20), and the power supply circuit (20) makes the voltage value of at least one of the plurality of operation voltages supplied to the display driving unit (30) smaller during the pause period than during the scanning period, based on the control signal (SM).