Image Display Apparatus Local Dimming for Multiple Images
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Solution Overview
Problem
Image display apparatuses face challenges in maintaining image quality when displaying multiple images with different brightness levels, as existing technologies struggle to perform local dimming effectively, leading to inconsistent display and degraded image quality.
Innovation Solution
An image display apparatus comprising a display panel, a backlight unit with multiple light sources, and a controller that independently performs local dimming on each multiple image by calculating average brightness levels, clipping brightness levels, and adjusting light source output based on these calculations to ensure consistent image quality across multiple images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If local dimming is performed on multiple images displayed together, then brightness expressiveness and contrast for each image are improved, but device complexity increases due to the need to independently control light sources for each image
Solution Approach 1:
The backlight unit is divided into multiple independently controllable light sources, allowing each image to have its own dedicated light source for local dimming control. This segmentation enables precise brightness control for each image without affecting others, resolving the contradiction between improved brightness expressiveness and increased device complexity by making the complexity manageable through modular organization.
Solution Approach 2:
Each light source is assigned to control a specific image, providing localized brightness control tailored to the characteristics of each individual image. This local quality approach allows different brightness levels and dimming strategies for different images simultaneously, achieving superior brightness expressiveness while maintaining organized control through the one-to-one mapping between light sources and images.
2Illumination intensity
If local dimming is performed on multiple images displayed together, then contrast for each image is improved, but energy consumption increases due to multiple light sources operating simultaneously
Solution Approach 1:
The system dynamically adjusts the operation of each light source based on the brightness requirements of its associated image. By enabling or disabling individual light sources according to real-time image characteristics, the system achieves high contrast where needed while minimizing energy consumption by turning off unnecessary light sources, thus resolving the contradiction between improved contrast and increased energy usage.
3Measurement precision
If average brightness level calculation is performed for each multiple image, then precise brightness control is achieved, but processing time increases
Solution Approach 1:
The brightness calculation process is segmented into independent calculations for each image, allowing parallel processing of multiple images. By dividing the overall processing task into separate image-specific calculations, the system achieves precise brightness level measurement for each image while reducing total processing time through concurrent execution, resolving the contradiction between measurement precision and processing time.
Data Source
AI summary
An image display apparatus is disclosed. The image display apparatus includes a display panel, a backlight unit including a plurality of light sources to output light to the display panel, an image receiver to receive multiple images from a plurality of image sources, and a controller to perform control to display the multiple images received from the image receiver and to independently perform local dimming on each of the multiple images according to multiple image display input, and thus performs local dimming for each multiple image during display of the multiple images.