Projection Backlighting Partitions for Keystone-Corrected Local Dimming
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Solution Overview
Problem
Traditional projection backlighting methods suffer from insufficient local contrast, poor black performance, uneven brightness, high energy consumption, and limited local dimming, leading to suboptimal image quality and efficiency.
Innovation Solution
Implement partition backlighting technology that dynamically adjusts brightness based on image content, coupled with keystone correction and smoothing algorithms to align image data with backlighting partitions, and apply low pass filters for smooth transitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If overall backlighting is used to simplify the system structure, then device complexity is reduced, but local contrast and black performance deteriorate
Solution Approach 1:
The backlighting system is divided into multiple independent backlighting partitions (e.g., 9 partitions arranged in 3x3 grid) that can be independently controlled. Each partition corresponds to a specific region of the projection screen, enabling independent brightness adjustment for different areas to achieve high local contrast while maintaining relatively simple overall structure.
Solution Approach 2:
Different backlighting partitions are assigned different brightness levels based on the local content requirements. Dark regions receive lower or zero backlighting to achieve deep blacks, while bright regions receive higher backlighting to enhance luminance, thereby improving local contrast without requiring complete system redesign.
2Manufacturing precision
If overall backlighting is used to maintain uniform brightness, then manufacturing precision requirements are reduced, but local brightness uniformity deteriorates
Solution Approach 1:
The backlighting system is segmented into multiple independently controllable partitions, allowing precise brightness control for each region. This segmentation enables fine-tuning of local brightness to achieve uniform appearance across the entire screen while reducing the need for high-precision manufacturing calibration.
Solution Approach 2:
The system employs feedback mechanisms where the brightness of each backlighting partition is dynamically adjusted based on the projected image content and detected screen uniformity requirements, enabling real-time compensation for manufacturing variations and achieving consistent local brightness.
3Ease of operation
If overall backlighting is used to reduce control complexity, then ease of operation is improved, but local dimming capability deteriorates
Solution Approach 1:
The backlighting system is divided into multiple partitions that can be independently controlled, providing fine-grained local dimming capability. The segmentation allows the system to adapt to different image content requirements in different screen regions while maintaining relatively simple control logic through automated algorithms.
Solution Approach 2:
The backlighting partitions are dynamically adjusted based on real-time image content analysis. The system automatically determines the appropriate brightness level for each partition according to the local image characteristics, achieving high adaptability for local dimming without requiring complex manual control.
4Ease of operation
If overall backlighting is used to simplify energy management, then ease of operation is improved, but energy consumption increases
Solution Approach 1:
The backlighting system is segmented into multiple independently controllable partitions, enabling selective activation of only those regions requiring illumination. This segmentation allows the system to reduce overall power consumption by dimming or turning off backlighting partitions corresponding to dark regions of the projected image while maintaining brightness in illuminated regions.
Solution Approach 2:
The system periodically analyzes the projected image content and dynamically adjusts the brightness of each backlighting partition accordingly. This periodic adaptation enables energy savings by reducing backlighting power during periods when certain regions display dark or low-luminance content, while maintaining high brightness when needed.
Data Source
AI summary
The present invention provides a projection device and method for processing partition backlighting of a projected image. The method is executed by the projection device, which projects an original image onto a projection screen to display the projected image. The method includes performing the keystone correction on the original image to be projected to obtain corrected image data and correcting the backlighting brightness of at least one of a plurality of backlighting partitions of the projection device, respectively based on the corrected image data after the keystone correction. The method further includes performing the backlighting smoothing processing on the edge portion of the at least one backlighting partition. The method further includes performing the backlighting smoothing processing on an edge of the projected image and the backlighting of the junction partition adjacent to the backlighting image.