Display Device Still Image Power Reduction via Dynamic Light Source Control
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Solution Overview
Problem
Display devices consume excessive power due to redundant image data processing, especially when displaying still images, as the signal controller continues to receive and process the same image data, leading to inefficient power usage.
Innovation Solution
A method and device that transmit input image data, calculate a representative value of stored image data, and adjust the driving ratio of the light source unit to reduce power consumption by compensating the image data when displaying still images, using a lower driving ratio and frequency compared to motion pictures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the signal controller continues to receive and process the same image data for still images, then the image display function is maintained, but power consumption increases due to redundant processing
Solution Approach 1:
The system performs preliminary detection to identify still image conditions and stores the image data in advance. When a still image is detected, the controller stores the image data and disables further reception of redundant image data, activating power saving mode before the redundant processing occurs. This preliminary action prevents the wasteful continuous reception and processing of identical image data while maintaining the ability to display the image function.
2Illumination intensity
If the light source unit operates at a constant driving ratio, then the image quality is maintained, but power consumption increases during still image display
Solution Approach 1:
The system dynamically adjusts the driving ratio of the light source unit based on the display content. When a still image is detected, the controller reduces the driving ratio to a lower level compared to motion picture display. This dynamic adjustment allows the light source to operate at different intensity levels appropriate for the content being displayed, maintaining sufficient image quality for still images while significantly reducing power consumption during their display.
3Speed
If the driving frequency is maintained at a high level, then the motion picture display quality is maintained, but power consumption increases during still image display
Solution Approach 1:
The system dynamically changes the driving frequency based on the type of content being displayed. For motion pictures, the controller maintains a high driving frequency to ensure smooth playback and quality display. When still images are detected, the controller reduces the driving frequency to a lower level. This dynamic frequency adjustment maintains the necessary refresh rate for motion pictures while reducing power consumption during still image display, as the light source and processing systems can operate at lower frequencies without compromising the static image quality.
Data Source
AI summary
A method of driving a display device includes driving a light source unit with a first driving ratio and outputting received image data to a display panel of the display device, storing the received image data upon receipt of a signal indicating a still image is displayed, calculating a second driving ratio of the light source unit from a representative value of the stored image data, compensating the stored image data according to the second driving ratio, driving the light source unit with the second driving ratio that is lower than the first driving ratio, and outputting the compensated image data to the display panel.