Multi-Frequency Display Panel Driving for Flicker and Power Control
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Solution Overview
Problem
Existing display devices face challenges in efficiently managing power consumption and reducing flicker issues when displaying multiple images with different refresh rates, particularly in areas with varying content types such as moving and still images.
Innovation Solution
The display device employs a multi-frequency driving mode that adjusts the refresh rates of different display areas based on the content type, driving moving images at a normal frequency and still images at a lower frequency, and uses a masking signal to control the display of still images in specific blocks, thereby optimizing power consumption and reducing flicker.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the display device refreshes all areas at a high rate to prevent flicker, then flicker is reduced, but power consumption increases
Solution Approach 1:
The display area is divided into multiple blocks, and each block is independently controlled with different refresh rates based on its content characteristics. This allows static content blocks to be refreshed at lower rates while dynamic content blocks maintain higher refresh rates, thereby reducing overall power consumption while preventing flicker in areas that require it.
Solution Approach 2:
The refresh rate of each block is dynamically adjusted based on the content type (static or moving images). The driving frequency for each block is changed according to the detected content characteristics, allowing the system to optimize between flicker reduction and power consumption in real-time.
2Device complexity
If the display device uses a single refresh rate for all areas, then implementation is simple, but it cannot optimize power consumption for different content types
Solution Approach 1:
The display area is segmented into multiple independently controllable blocks, each capable of operating at different refresh rates. This segmentation enables differentiated power management for different content types while maintaining a relatively simple overall control structure through the use of a masking signal mechanism.
Solution Approach 2:
The refresh rate parameter is varied across different blocks based on content characteristics. By changing the driving frequency parameter for each block according to whether it displays static or moving images, the system achieves power optimization without requiring complex control logic.
3Use of energy by moving object
If the display device refreshes static areas at lower rates to save power, then power consumption is reduced, but flicker may occur at boundaries between areas with different refresh rates
Solution Approach 1:
A masking signal is introduced as an intermediary mechanism to control the display of still images in specific blocks. This masking signal prevents visible flicker at boundaries between areas with different refresh rates by selectively masking the display output, thereby allowing lower refresh rates in static areas without compromising visual quality.
Solution Approach 2:
Different blocks are assigned different refresh rates according to their local content requirements. Static content blocks use lower refresh rates to save power, while dynamic content blocks maintain higher refresh rates, with the masking signal ensuring smooth transitions at boundaries between these differently refreshed areas.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces power consumption and minimizes flicker by dynamically adjusting the refresh rates of different image types, enhancing the display's energy efficiency and visual quality.
Implementation Method 1
An organic light emitting display device among display devices displays an image using an organic light emitting diode that generates light by recombination of electrons and holes
Data Source
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AI summary
A display device (DD) includes a display panel (DP) including a plurality of pixels respectively connected to corresponding data lines (DL) and respectively connected to corresponding scan lines (GIL, GWL), a data driving circuit (200) for driving the corresponding data lines (DL), a scan driving circuit (SD) for driving the corresponding scan lines (GIL, GWL), and a driving controller (100) for, during a multi-frequency mode, dividing the display panel (DD) into a first display area (DA1) and a second display area (DA2) and controlling the data driving circuit (200) and the scan driving circuit (SD) so that the first display area (DA1) is driven at a first driving frequency, and the second display area (DA2) is driven at a second driving frequency lower than the first driving frequency. During the multi-frequency mode, the driving controller (100) divides the second display area (DA2) into a plurality of blocks and alternately drives the plurality of blocks every frame.