Backlight Device Switching Between Local Dimming and Uniform Brightness Modes
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Solution Overview
Problem
The time difference between image signals and backlight signals in display devices, particularly in vehicles, can lead to delayed image rendering on rear cameras, affecting driver judgment in low-light environments.
Innovation Solution
A backlight device with a switching element, graphics processor, and graphics generator that operates in normal and safe modes. In normal mode, different backlight blocks have varying brightness levels based on partition data signals. In safe mode, all blocks have the same brightness level based on image signals, ensuring immediate and consistent image rendering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If local dimming is applied to improve image quality and brightness control, then brightness distribution is improved, but image timing synchronization deteriorates
Solution Approach 1:
The patent implements dynamic switching between two operational modes: normal mode (with local dimming and partition data signals) and safe mode (without local dimming and using original image signals). The system dynamically adjusts its behavior based on real-time conditions such as ambient light levels and image content, allowing it to optimize between image quality and timing synchronization as needed
2Manufacturing precision
If partition data signals are used for local dimming control, then brightness control precision is improved, but system complexity increases
Solution Approach 1:
The patent extracts the local dimming functionality into a separate, optional mode that can be independently controlled. The graphics processor can selectively apply partition data signals for local dimming only when needed (in normal mode), while the rest of the system continues to operate with standard image signals. This separation allows high precision brightness control where required without forcing the entire system to adopt the complexity of partition-based control
3Loss of time
If frame-rate synchronization is implemented to improve timing accuracy, then response time is improved, but image quality deteriorates
Solution Approach 1:
The system dynamically switches between two operational states based on timing requirements. In safe mode, the system prioritizes timing synchronization by displaying images and backlight simultaneously without local dimming processing. In normal mode, the system prioritizes image quality with local dimming, accepting the timing delay. This dynamic adaptation allows the system to optimize for either response time or image quality depending on the situation
Data Source
AI summary
A backlight device to provide a light source is provided. The backlight device includes a switching element, a graphics processor, and a graphics generator. The graphics processor is electrically connected to the switching element, and generates a partition data signal. The graphics generator is electrically connected to the switching element, and generates an image signal. When the backlight device operates in a normal mode, the switching element receives the partition data signal, so that different blocks of the backlight device have different levels of brightness. When the backlight device operates in a safe mode, the switching element receives the image signal, so that different blocks of the backlight device have the same level of brightness.