Backlight Partition Overlap Control for LCD Latency
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Solution Overview
Problem
Liquid Crystal Display (LCD) technology faces challenges with low contrast and high power consumption due to its reliance on a backlight module, which results in issues like latency and freezing when using local dimming technology, especially in high-resolution displays and virtual reality devices.
Innovation Solution
The method involves dividing the backlight module into multiple independently controllable partitions and determining overlapping regions between frames to optimize backlight values, using equations to calculate and apply these values based on the area occupation ratios of overlapping partitions, thereby reducing computational load and improving contrast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If local dimming technology is used to improve contrast, then contrast is improved, but latency and freezing occur
Solution Approach 1:
The patent applies preliminary action by predicting the backlight value for the current frame based on overlapping regions from the previous frame before actual display. The method determines overlapping regions between frames, retrieves previously calculated backlight values, and uses them to pre-determine current frame backlight values, avoiding real-time calculation delays and reducing latency while maintaining contrast improvement.
Solution Approach 2:
The patent implements dynamics by adaptively adjusting the backlight value determination strategy based on frame overlap characteristics. When significant overlap exists between frames, the system dynamically reuses previous backlight values; when overlap is minimal, it performs fresh calculations. This dynamic adaptation optimizes both contrast quality and response time depending on the specific display scenario.
2Illumination intensity
If local dimming technology is used to improve contrast, then contrast is improved, but device freezing occurs
Solution Approach 1:
The patent performs preliminary calculation of backlight values during periods when the display content remains unchanged between frames. By determining backlight values in advance for overlapping regions and storing them for reuse, the system eliminates the need for repeated real-time calculations, preventing device freezing and maintaining smooth operation while preserving contrast enhancement.
Solution Approach 2:
The patent uses copying by replicating and reusing backlight value data from previous frames for overlapping regions. Instead of recalculating backlight values for every frame, the system copies previously computed values and applies them to corresponding regions, significantly reducing computational load and preventing device freezing while maintaining contrast improvement.
3Illumination intensity
If backlight module is used to emit light, then light emission is achieved, but power consumption increases
Solution Approach 1:
The patent applies local quality by dividing the backlight module into multiple independently controllable partitions and determining optimal backlight values for each partition based on local image characteristics in overlapping regions. This allows different parts of the display to have different brightness levels, enabling light emission where needed while reducing power consumption in darker regions, thus achieving both light emission and energy efficiency.
Data Source
AI summary
Embodiments of the present disclosure provide a method for driving a display device to display an image sequence and a display device therefor. The display device includes a backlight module having a plurality of backlight partitions. The image sequence includes at least a first frame image and a second frame image. The method includes determining a first region in the first frame image and a second region in the second frame image that correspond to an overlapping portion of the first frame image and second frame image as overlapping regions; obtaining, based at least partially on a first backlight value of a first backlight partition(s) corresponding to the first region, a second backlight value of a second backlight partition corresponding to the second region; and controlling a backlight brightness of the second backlight partition based on the second backlight value when the display device displays the second frame image.