Display Driving Controller Frequency Adaptation for Flicker Reduction
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Solution Overview
Problem
Display panels face challenges in reducing power consumption while maintaining display quality, as driving at low frequencies for still images can cause image flicker, especially at distances farther from the data driver due to voltage drops.
Innovation Solution
A display apparatus with a driving controller that determines the driving frequency based on input image data, using flicker values stored in lookup tables and adjusting for voltage drops and ambient light, to minimize power consumption and prevent flicker.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the display panel is driven at a low frequency mode to reduce power consumption, then power consumption is reduced, but image flicker occurs resulting in poor display quality
Solution Approach 1:
The patent applies dynamics by making the driving frequency adjustable rather than fixed. The driving controller dynamically switches between a first driving frequency (higher) and a second driving frequency (lower) based on whether the displayed image is static or moving. This resolves the contradiction by allowing the system to operate at low frequency for power savings when displaying static images, while automatically switching to high frequency when motion is detected to prevent flicker, thus adapting the operating state to match the content being displayed.
Solution Approach 2:
The patent changes the driving frequency parameter based on the type of image content. The driving controller detects whether the image is static or moving and adjusts the driving frequency accordingly - using a lower frequency for static images to reduce power consumption and a higher frequency for moving images to maintain display quality and prevent flicker. This parameter adjustment resolves the contradiction between power consumption and display quality.
2Use of energy by moving object
If the display panel is driven at a low frequency mode, then power consumption is reduced, but voltage drop causes more severe image flicker at portions farther from the data driver
Solution Approach 1:
The patent uses dynamic frequency adjustment to counteract the harmful effect of voltage drop. When displaying static images, the system operates at a lower driving frequency to reduce power consumption. However, when motion is detected in any region of the display panel, the system switches to a higher driving frequency, which provides sufficient current drive strength to overcome voltage drop effects and prevents flicker in all regions, including those farther from the data driver.
Solution Approach 2:
The patent implements a feedback mechanism where the driving controller continuously monitors the display content to detect motion. Based on this feedback, the controller adjusts the driving frequency - maintaining low frequency for static content to save power, and switching to high frequency when motion is detected to eliminate flicker caused by voltage drop. This feedback-based adjustment resolves the contradiction by responding to actual display conditions.
Data Source
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AI summary
A display apparatus includes a display panel displaying an image based on an input image data, a data driver outputting a data voltage to a data line, and a driving controller determining a driving frequency of the display panel based on the input image data. The driving controller includes a flicker value storage configured to store flicker values for grayscale values corresponding to the input image data, a voltage drop determiner configured to adjust a flicker value of the flicker values based on a voltage drop of the display panel, a still image determiner configured to determine whether the input image data is a still image or a video image, and a driving frequency determiner configured to determine the driving frequency of the display panel using the flicker value based on the input image data being the still image.