FPGA-Based LCD Backlight Control for High-Division Local Dimming
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Solution Overview
Problem
Conventional LCD TVs are unable to support high division local dimming due to insufficient calculation buffer in their software systems, limiting their ability to achieve high contrast and brightness levels comparable to OLED displays.
Innovation Solution
A liquid crystal display backlight module controlling method and device that uses a programmable logic gate array board to extract and process image signals, converting them into row and column signals to control light emitting diodes in the backlight light board, eliminating the need for a software system and enabling high division local dimming calculations, while reducing the number of integrated circuit chips required.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional software systems are used for local dimming calculation, then the system can be implemented with standard processing, but the calculation buffer is insufficient and cannot support high division (5000 or more) local dimming
Solution Approach 1:
The patent replaces the conventional software-based local dimming calculation system with a hardware-based Field Programmable Gate Array (FPGA) system. This substitution enables sufficient calculation buffer for high division (5000 or more) local dimming operations, overcoming the limitations of software processing while maintaining system implementability through hardware acceleration.
2Ease of manufacture
If the number of integrated circuit chips is reduced, then the cost is lowered, but the calculation capability for high division local dimming may be compromised
Solution Approach 1:
The patent merges multiple functions into the FPGA device, which performs both image signal processing and local dimming calculation in a single integrated hardware platform. This consolidation reduces the total number of integrated circuit chips required in the system while maintaining sufficient calculation capability for high division local dimming, thereby lowering manufacturing costs without compromising performance.
3Illumination intensity
If LCD division is increased to 5000 or more to achieve OLED-level image quality, then brightness and contrast can exceed OLED, but the conventional software system cannot provide sufficient calculation buffer
Solution Approach 1:
The patent replaces the insufficient software calculation system with an FPGA-based hardware calculation system that provides adequate calculation buffer for processing 5000 or more divisions. This enables LCD displays to achieve OLED-level image quality with superior brightness and contrast performance while managing the complexity through hardware acceleration rather than software processing.
Data Source
AI summary
A liquid crystal display backlight module controlling method and a controlling device thereof disclosed in the present invention includes a programmable logic gate array board extracting backlight information from an image signal. Calculation of local dimming is performed by the programmable logic gate array board, a calculation buffer for local dimming calculation is sufficient, which can increase liquid crystal display backlight divisions. Furthermore, the present invention employs a row signal and a column signal to control and switch on light emitting diodes in the backlight light board, which can achieve the cost lowering effect.