LED dynamic backlight control technology has gradually become the mainstream of research and application in the field of LCD TV due to its significant characteristics such as energy saving and improving contrast. Especially, the partition dynamic backlight control technology using white LED has attracted more and more attention due to its simple backlight control circuit structure and high performance, becoming a focus of research today.
This article first introduces and analyzes the principles and advantages and disadvantages of the main technical solutions for LED dynamic backlight control in the field of liquid crystal displays at home and abroad. Based on this, the research focus of this article is determined -2D dynamic backlight control technology for white LED. This article focuses on the dynamic backlight main brightness extraction algorithm and hardware implementation algorithm for backlight image simulation in backlight control technology, and conducts functional division, design, and simulation verification of the overall architecture of the dynamic backlight control system. The dynamic backlight main brightness extraction process is the core of the entire dynamic backlight control system, which is related to the quality of the LCD TV display screen.
This article introduces the average algorithm, mean square algorithm, dark background image backlight enhancement algorithm, and IMF algorithm used for dynamic backlight main brightness extraction. An analysis was conducted on the above algorithms, and a dynamic backlight main brightness extraction algorithm based on the image CDF (Cumulative Distribution Function) threshold was proposed. Through subjective and objective analysis and comparison after the experiment, the image CDF threshold algorithm has shown good stability compared to other algorithms. The backlight image simulation process is the most complex part of the dynamic backlight control system. How to calculate the current simulated backlight image in real-time through the designed hardware circuit is related to the feasibility of 2D dynamic backlight control technology for LCD TVs, and it is also the most crucial in the design of backlight control circuits.
This article proposes a hardware implementation algorithm for backlight image simulation based on image reduction convolution amplification through experimental analysis. This algorithm can ensure real-time simulation of backlight images and significantly reduce hardware resource costs in hardware design. Based on the principle of backlight control, this article designs the overall architecture of the backlight control system, defines the functions of each module, and completes the RTL level hardware description of each module using Verilog HDL language. Joint simulation and verification based on Quartus II, ModelSim, and MATLAB software are completed.

Among them, the focus is on the design and verification of two functional modules: the main brightness extraction module based on CDF threshold and the backlight image simulation module based on scaling convolution. At the same time, the design results and functional verification of circuits and modules such as two-dimensional convolution, quadratic linear scaling circuit, image data access controller, DDR SDRAM controller, image compensation circuit, LVDS interface, etc. were introduced in detail. The verification results indicate that the circuit functions of each module designed in this article are correct and meet the design requirements.
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