Segmented Backlight Control for Faster Scan-Synced Displays
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Solution Overview
Problem
Traditional display devices using mini-LEDs and micro-LEDs suffer from long hardware delays due to sequential signal transmission, which limits their real-time response speed, particularly in applications requiring high standards such as surgery.
Innovation Solution
The display device employs a backlight control method with increased serial peripheral interfaces to divide backlight areas along scan lines, allowing simultaneous control of multiple backlight areas through progressive scanning, synchronized signals, multi-threads, or hardware interruptions, thereby reducing delay time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If sequential signal transmission is used to drive LEDs in traditional backlight modules, then the system structure remains simple, but the hardware delay becomes long and real-time response speed deteriorates
Solution Approach 1:
The patent divides the backlight module into multiple independent backlight areas (first backlight area, second backlight area, etc.), each driven by separate driving boards and serial peripheral interfaces. This segmentation allows parallel signal transmission to different backlight regions, reducing the sequential transmission delay while maintaining manageable system complexity through modular organization.
2Reliability
If sequential transmission from first LED to last LED is implemented within a complete image frame, then complete lighting coverage is achieved, but the transmission time increases and response speed decreases
Solution Approach 1:
The backlight module is segmented into multiple backlight areas that can be driven independently. Each area receives lighting control signals through dedicated driving boards and SPI interfaces, allowing simultaneous or staggered activation across different regions. This ensures complete lighting coverage while reducing total transmission time compared to sequential LED-by-LED driving.
Solution Approach 2:
The patent transitions from one-dimensional sequential LED addressing to a two-dimensional area-based addressing scheme. By organizing LEDs into spatial regions (backlight areas) and using multiple SPI interfaces, the system adds a spatial dimension to signal transmission, enabling parallel control paths and reducing overall transmission time while maintaining complete coverage.
3Loss of time
If multiple serial peripheral interfaces are used to control different backlight areas simultaneously, then the response time is reduced, but the device complexity increases
Solution Approach 1:
The system is divided into modular backlight areas, each with its own driving board and SPI interface. This segmentation allows parallel control operations across multiple interfaces, reducing total control time. The modular structure manages complexity by organizing multiple interfaces into distinct, independently manageable units rather than a monolithic control system.
Data Source
AI summary
The present invention provides a display device and its backlight control method. The display device includes a display panel, a backlight module, and a timing control unit. The display panel has a plurality of scan lines, and the backlight module has a plurality of light-emitting units. These light-emitting units are divided into a first backlight area and a second backlight area along the scanning direction of one of the scan lines. The backlight control method includes the steps of obtaining a backlight luminance data by the timing control unit, outputting a first backlight area control signal to the backlight driving unit by the timing control unit to control the luminance of the first backlight area, and outputting a second backlight area control signal to the backlight driving unit by the timing control unit to control the luminance of the second backlight area.