Display Driving Frequency Control for Power Optimization
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Solution Overview
Problem
Display apparatuses, such as tablet PCs, consume unnecessary power as they do not adjust the driving frequency of the display panel based on the type of image being displayed, leading to increased overall power consumption.
Innovation Solution
A display apparatus with a driving controller that determines the driving frequency of the display panel based on flicker values for grayscale values of the input image data, outputting a driving frequency signal to the host, allowing for reduced power consumption by adjusting the frequency according to whether the image is still or video, and optimizing power usage by segmenting the display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the display panel is driven with a low frequency to reduce power consumption, then power consumption is reduced, but flicker may occur affecting display quality
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the driving frequency of the display panel based on the grayscale values of the displayed image. When grayscale values indicate low brightness (higher flicker risk), the system increases the driving frequency to prevent flicker. When grayscale values indicate high brightness (lower flicker risk), the system decreases the driving frequency to reduce power consumption. This dynamic parameter adjustment resolves the contradiction between power consumption and flicker prevention.
2Device complexity
If the display panel driver does not provide driving frequency information to the host, then device complexity is reduced, but unnecessary power consumption occurs
Solution Approach 1:
The patent implements feedback by having the display panel driver communicate the determined driving frequency back to the host system. The host uses this frequency information to adjust its power management strategies and synchronize operations accordingly. This feedback mechanism enables the host to make informed decisions about power allocation and system scheduling, preventing unnecessary power consumption while maintaining relatively simple device architecture.
3Device complexity
If the display panel is driven at a fixed frequency, then device complexity is reduced, but power consumption cannot be optimized for different image types
Solution Approach 1:
The patent applies dynamics by transitioning from a fixed driving frequency approach to a dynamic frequency adjustment approach. The system continuously monitors the grayscale values of the displayed image and adjusts the driving frequency in real-time based on the image characteristics. This dynamic adaptation allows the display panel to operate at optimal frequencies for different image types (still images, video, high brightness, low brightness), significantly optimizing power consumption without requiring complex additional hardware.
Data Source
AI summary
A display apparatus including: a display panel configured to display an image based on input image data; a data driver configured to output a data voltage to the display panel; and a driving controller configured to determine a driving frequency of the display panel based on flicker values for grayscale values of the input image data and output a driving frequency signal representing the driving frequency of the display panel to a host.