Display Device Adaptive Driving Frequency Control
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Solution Overview
Problem
Display devices consume excessive power as they do not differentiate between still images, motion pictures, and text screens in terms of driving frequencies, leading to unnecessary power usage without significant degradation in viewer experience.
Innovation Solution
A display device and method that includes a signal controller to determine the type of image being displayed and adjust the driving frequency accordingly, using a motion picture frequency for motion pictures, a lower frequency for still images, and an ultra-low frequency of about 10 Hz or less for text screens, reducing power consumption while maintaining image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the display device operates at a high driving frequency to ensure image quality, then image quality is maintained, but power consumption increases
Solution Approach 1:
The display device dynamically adjusts its driving frequency based on the type of content being displayed. The controller detects whether the input signal is a still image or motion picture, and automatically switches between different frequency modes (e.g., 60Hz for motion pictures, 30Hz for still images), making the system adaptable to different operational requirements and reducing unnecessary power consumption.
Solution Approach 2:
The invention changes the operating parameter (driving frequency) of the display device according to the content type. By modifying the frequency parameter from a fixed high value to a variable value that adapts to content requirements, the system achieves lower power consumption while maintaining adequate image quality for each specific use case.
2Use of energy by moving object
If the display device reduces driving frequency to save power, then power consumption decreases, but image quality may deteriorate
Solution Approach 1:
The invention segments the display operation into different modes based on content type. By dividing the operational space into distinct categories (still images vs. motion pictures) and applying appropriate frequency settings to each segment, the system ensures that image quality requirements are met for each specific type without compromising overall performance.
3Reliability
If the display device uses a fixed high driving frequency for all image types, then image quality is consistently maintained, but power consumption is unnecessarily high
Solution Approach 1:
The display device transitions from a static fixed-frequency operation to a dynamic adaptive-frequency operation. The controller continuously monitors the input signal type and adjusts the driving frequency in real-time, enabling the system to optimize power consumption while maintaining image quality appropriate for each content type.
4Use of energy by moving object
If the display device lowers driving frequency for still images, then power consumption is reduced, but the system complexity increases due to need for image type detection
Solution Approach 1:
The display device incorporates a feedback mechanism where the controller detects the type of input signal (still image or motion picture) and uses this information to adjust the driving frequency. This feedback loop enables automatic adaptation without requiring complex manual intervention, balancing the trade-off between power savings and system complexity.
Data Source
AI summary
A display device configured to consume less power is disclosed. In one aspect, the display device includes a display panel comprising a pixel connected to a gate line and a data line, a data driver connected to the data line to apply a data voltage, and a gate driver connected to the gate line to sequentially apply a gate-on voltage. The display device additionally includes a signal controller configured to determine image data as corresponding to one of a motion picture, a still image, and a text screen. Furthermore, the signal controller is configured to drive the display panel, the data driver, and the gate driver at one of a motion picture frequency for displaying the motion picture, a still image frequency lower than the motion picture frequency for displaying the still image, and an ultra-low frequency of about 10 Hz or less for displaying the text screen.