Backlight Block Luminance Control via Adjacent Light Statistics
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Solution Overview
Problem
Current display devices with local dimming technologies face challenges in optimizing backlight control for improved power efficiency and contrast ratio, as they rely on simplistic methods that do not account for the complex interplay of light emission from adjacent backlight blocks.
Innovation Solution
A display device with a controller that determines adjusted luminance values for individual backlight blocks by calculating a statistic of provisional luminance values from adjacent blocks, using a predefined function to calculate an adjustment coefficient, allowing for dynamic control of light emission based on relative luminance values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If local dimming divides the backlight into multiple blocks and controls each block independently, then power consumption is reduced and contrast ratio is improved, but the control method becomes more complex and does not account for light emission interplay between adjacent blocks
Solution Approach 1:
The patent applies local quality by adjusting the luminance of each backlight block based on its own luminance requirements and the luminance characteristics of adjacent blocks. The controller calculates adjusted luminance values that account for local light emission patterns, ensuring each block operates at an optimal luminance level while considering its spatial relationship with neighboring blocks. This resolves the contradiction by enabling fine-grained local control that reduces power consumption without requiring overly complex global control mechanisms.
Solution Approach 2:
The patent implements feedback by using the luminance values of adjacent backlight blocks as input for determining the adjusted luminance value of each block. The controller continuously monitors and adjusts backlight block luminance based on the interplay between adjacent blocks, creating a feedback loop that optimizes overall backlight performance. This feedback mechanism enables the system to account for light emission interplay while maintaining manageable control complexity through iterative optimization.
2Device complexity
If local dimming controls each backlight block independently without considering adjacent blocks, then control is simpler, but the contrast ratio and display quality are not optimized due to unaccounted light emission interplay
Solution Approach 1:
The patent applies local quality by adjusting the luminance of each backlight block based on its own luminance requirements and the luminance characteristics of adjacent blocks. The controller calculates adjusted luminance values that account for local light emission patterns, ensuring each block operates at an optimal luminance level while considering its spatial relationship with neighboring blocks. This resolves the contradiction by enabling fine-grained local control that reduces power consumption without requiring overly complex global control mechanisms.
Solution Approach 2:
The patent applies segmentation by dividing the backlight into multiple independently controllable blocks and processing each block's luminance adjustment separately. The controller calculates adjusted luminance values for each block based on its own characteristics and those of adjacent blocks, then applies these adjustments individually. This segmentation approach enables the system to account for light emission interplay between blocks while maintaining relatively simple control logic for each individual block, thus improving contrast ratio without excessive complexity.
3Ease of operation
If the entire backlight region lights at 100% all the time, then the display is bright and simple to control, but power consumption is high and contrast ratio is reduced
Solution Approach 1:
The patent applies segmentation by dividing the backlight into multiple independently controllable blocks. Instead of controlling the entire backlight as a single unit, the controller can adjust the luminance of individual blocks or groups of blocks based on the displayed image content. This segmentation enables differential control where only necessary regions are illuminated at high brightness, significantly reducing overall power consumption while maintaining display simplicity through automated control algorithms.
Solution Approach 2:
The patent applies dynamics by enabling the backlight luminance to change dynamically based on the displayed image content. The controller continuously analyzes the image data and adjusts the luminance of each backlight block in real-time, transitioning between different luminance states as needed. This dynamic control allows the system to maintain high brightness where needed while reducing luminance in dark regions, optimizing power consumption without requiring manual intervention or complex user operation.
Data Source
AI summary
A controller acquires video data, determines provisional luminance values for backlight blocks based on the video data, determines an adjustment coefficient for a backlight block of interest selected from the backlight blocks, determines an adjusted luminance value for the backlight block of interest based on the provisional luminance value and the adjustment coefficient for the backlight block of interest, and controls the backlight block of interest in accordance with the adjusted luminance value. In determining the adjustment coefficient, the controller calculates a statistic of provisional luminance values for reference backlight blocks including backlight blocks adjacent to the backlight block of interest, calculates a relative value of the statistic with respect to the provisional luminance value for the backlight block of interest, and determines the adjustment coefficient for the backlight block of interest based on the relative value and a predefined function.