Display Driver Frequency Control for Flicker and Power
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Solution Overview
Problem
Display devices face challenges in reducing power consumption while minimizing visible flicker when operating at reduced driving frequencies, especially when switching between moving and still images.
Innovation Solution
A display device with a display panel driver that adjusts driving frequencies based on input image data, using flicker lookup tables to select optimal frequencies for moving and still images, with higher frequencies for moving images and lower frequencies for still images to reduce power consumption and improve display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the driving frequency is decreased to reduce power consumption, then power consumption is reduced, but flicker becomes visible
Solution Approach 1:
The patent implements dynamic frequency adjustment by switching between a first driving frequency (higher) and a second driving frequency (lower) based on image type detection. The system dynamically adapts the driving frequency to match the content being displayed, using higher frequencies for moving images to prevent flicker and lower frequencies for still images to reduce power consumption.
Solution Approach 2:
The patent changes the driving frequency parameter based on the type of image content. By detecting whether the input image is a moving image or a still image, the system adjusts the driving frequency parameter accordingly - maintaining higher frequencies for moving images and reducing to lower frequencies for still images, thus optimizing both power consumption and flicker prevention.
2Use of energy by stationary object
If the driving frequency is decreased for still images, then power consumption is reduced, but image quality may deteriorate due to visible flicker
Solution Approach 1:
The system dynamically adjusts the driving frequency based on real-time detection of image type. For still images, it switches to a lower second driving frequency to reduce power consumption, while for moving images, it maintains a higher first driving frequency to ensure display quality and prevent flicker, thus adaptively optimizing both energy efficiency and display reliability.
Solution Approach 2:
The patent modifies the driving frequency parameter according to the detected image content characteristics. When still images are detected, the frequency parameter is changed to a lower value to save energy, while moving images trigger a higher frequency setting to maintain display quality, achieving a balance between power consumption and visual reliability.
3Object-affected harmful factors
If the driving frequency is increased to prevent flicker, then flicker is reduced, but power consumption increases
Solution Approach 1:
The patent implements a dynamic frequency selection mechanism that switches between a first driving frequency (higher, for flicker reduction) and a second driving frequency (lower, for power savings) based on the detected image type. This dynamic approach ensures high frequency is used only when necessary (moving images) to prevent flicker, while allowing lower frequency (and thus lower power consumption) for still images where flicker is less perceptible.
Solution Approach 2:
The system changes the driving frequency parameter adaptively based on content analysis. When moving images are detected, the frequency parameter is increased to the first driving frequency to eliminate flicker. When still images are detected, the frequency parameter is reduced to the second driving frequency to minimize power consumption, optimizing the trade-off between flicker prevention and energy usage.
4Use of energy by moving object
If different driving frequencies are used for moving and still images, then power consumption is optimized, but system complexity increases due to frequency selection mechanisms
Solution Approach 1:
The patent segments the operation into distinct modes based on image type detection. The system divides the driving frequency control into separate first and second frequencies corresponding to moving and still images respectively. This segmentation allows the use of multiple frequency settings without requiring a continuously variable frequency controller, simplifying the overall system architecture while still achieving optimized power consumption.
Solution Approach 2:
The patent introduces dynamic adaptability through image type detection and conditional frequency switching. By using a detection mechanism that identifies whether the input is a moving or still image, the system dynamically selects the appropriate driving frequency. This dynamic approach optimizes power consumption without requiring complex continuous control, as the system only needs to switch between two predefined frequency states based on content type.
Data Source
AI summary
A display device includes a display panel including a plurality of pixels and a display panel driver configured to drive the display panel. Here, the display panel driver is configured to receive input image data, to drive the display panel at a first driving frequency when the input image data corresponds to a moving image, and to select one of a plurality of flicker lookup tables based on the first driving frequency and drive the display panel at a second driving frequency based on the flicker lookup table when the input image data corresponds to a still image.