Display Power Saving via Periodic Mode Switching
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Solution Overview
Problem
Conventional liquid crystal displays (LCDs) consume high power as they remain in a constant displaying mode, lacking a power-saving function during frame presentation.
Innovation Solution
The display is divided into a displaying mode and a power-saving mode, with operating parameters adjusted to reduce power consumption by stopping or decreasing voltage and current to components like the source buffer, digital to analog converter, and gate buffer, and lowering the oscillation frequency during the power-saving mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the display remains in constant displaying mode to maintain image fluency, then image quality is preserved, but power consumption increases
Solution Approach 1:
The display system dynamically switches between displaying mode and power-saving mode based on timing signals. During the displaying mode, all buffers and converters operate at full capacity to maintain image quality. During the power-saving mode, the system adjusts operating parameters by stopping or decreasing voltage and current to components like source buffer, digital to analog converter, and gate buffer, thereby reducing power consumption while maintaining acceptable image fluency through the hold-type display characteristic
Solution Approach 2:
The display operation is divided into periodic cycles consisting of a displaying period and a power-saving period. The timing controller generates timing signals that periodically switch the display between these two modes. During the displaying period, the display operates normally to present frames; during the power-saving period, operating parameters are adjusted to reduce power consumption. This periodic switching allows the system to achieve average power savings while maintaining image fluency through the persistence of vision effect
2Use of energy by moving object
If operating parameters are adjusted to reduce power consumption, then energy efficiency improves, but display performance may deteriorate
Solution Approach 1:
The system changes operating parameters (voltage and current levels) of various display components based on the operating mode. During power-saving mode, the timing controller adjusts parameters such as stopping or decreasing voltage to the source buffer, digital to analog converter, common electrode buffer, and gate buffer. These parameter changes reduce power consumption while the hold-type display characteristic ensures that image quality remains acceptable during the power-saving period
3Reliability
If all buffers and converters operate continuously to maintain image quality, then image fluency is preserved, but power consumption increases
Solution Approach 1:
The display system is segmented into multiple independent operational components: source buffer, digital to analog converter, common electrode buffer, gate buffer, and timing controller. This segmentation allows selective control of each component's operation. During power-saving mode, the timing controller can independently adjust or stop operation of specific buffers and converters, reducing power consumption while maintaining the ability to restore full operation during displaying mode to preserve image quality
Data Source
AI summary
A display and a driving control method for the display are provided. The display includes a display panel, a driving control module and a power-saving control module. The display panel is configured to display a plurality of frames. The driving control module is coupled to the display panel for providing a driving signal of each frame to the display panel. The power saving control module is coupled to the driving control module. The displaying period of each frame includes a first period and a second period. During the first period, the display enters a displaying mode. During the second period, the power-saving control module adjusts the operating parameters of the driving control module such that the display enters a power-saving mode. As a result, the power consumption of the display can be reduced.