Dynamic Filter Core Selection for Backlight Halo Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing LCD display technologies face issues with light leakage, resulting in poor black levels and low contrast due to uneven backlight distribution, especially when the number of dimming zones is insufficient, leading to halo effects near objects.
Innovation Solution
A method and device for controlling backlight brightness in a display device with multiple dimming zones, which involves determining a target image display mode, selecting a corresponding filter core size, and performing smoothing-filtering on initial backlight control data to obtain target backlight control values for each zone, thereby adjusting backlight intensity uniformly across the screen.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If local dimming technology with multi-zones mini LEDs is adopted, then contrast and pure black display are improved, but uneven brightness and halo effects occur when the number of dimming zones is insufficient
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the filter core size parameter based on image content characteristics and display modes. The processing chip selects different filter core sizes (e.g., 3x3, 5x5, 7x7, 9x9) to optimize the smoothing effect, transforming a fixed parameter system into a dynamic one that adapts to different scenarios, thereby resolving the contradiction between backlight uniformity and device complexity.
Solution Approach 2:
The patent implements dynamics by making the filter core size adjustable and adaptive rather than fixed. The system dynamically selects filter core parameters based on image content analysis and display mode settings, enabling the backlight control system to adapt its behavior to different scenarios. This dynamic approach allows the system to achieve uniform backlight distribution without requiring an excessive number of dimming zones.
2Illumination intensity
If filter core smoothing is applied to uniformize backlight distribution, then brightness uniformity improves, but halo effects near objects become heavier
Solution Approach 1:
The patent resolves this contradiction by changing the filter core size parameter dynamically. Smaller filter cores (e.g., 3x3) are used when precision is critical to avoid halo effects, while larger filter cores (e.g., 7x7, 9x9) are used when uniformity is the priority. This parameter adaptation allows the system to optimize the balance between uniformity and precision based on specific display scenarios.
Solution Approach 2:
The system employs dynamic filter core selection based on image content characteristics and display modes. By making the filter core size adjustable, the system can switch between strong smoothing (larger cores) for uniformity-critical scenes and weak smoothing (smaller cores) for precision-critical scenes, thereby dynamically resolving the contradiction between uniformity and control precision.
3Ease of operation
If fixed filter core size is used for smoothing, then processing simplicity is maintained, but adaptability to different image content and display modes is reduced
Solution Approach 1:
The patent transforms the static filter core size into a dynamic parameter that adapts to different image content and display modes. The processing chip automatically selects appropriate filter core sizes based on content analysis and mode settings, maintaining processing simplicity through automated selection while achieving high adaptability to various scenarios without requiring manual intervention.
Solution Approach 2:
The system changes the filter core size parameter based on different operating conditions. By pre-defining multiple filter core options and automatically selecting the appropriate one based on image content and display mode, the system maintains operational simplicity while achieving versatile adaptability across different scenarios.
Data Source
AI summary
A method of controlling backlight brightness, applicable to a display device including a backlight module having a plurality of dimming zones, includes: determining a target image display mode; determining a target filter core according to the target image display mode; obtaining initial backlight control data by acquiring initial backlight control values of respective dimming zones according to image data of respective image segments of a first image, wherein the respective image segments correspond to the respective dimming zones in a one-to-one correspondence; obtaining target backlight control data by performing smoothing-filtering on the initial backlight control data with the target filter core, wherein the target backlight control data comprises respective target backlight control values of the plurality of dimming zones; and controlling backlight brightness of the respective dimming zones according to the respective target backlight control values. A backlight brightness control device and a display device are further provided.