Observing the recent CES 2021, we can find that new products using the next-generation display technology mini-LED backlight are springing up in the venue, and many major brands at home and abroad have announced that new products equipped with mini-LED backlight are expected to be launched this year. Come out, covering tablets, laptops, TVs, or other niche products, etc.
Macroblock’s chairman Dr. Yang Lichang said this year: “Macroblock is very optimistic that the mini-LED backlight consumer market will enter the growth phase this year. In recent years, it has successively launched FALD, Full Array Local Dimming suitable for different applications. The mini-LED backlight driver chip assists LCD display manufacturers to continue to innovate in the high-end display field through the passive full-matrix “scanning architecture”.”
Macroblock “scanning architecture” technology helps LCD display manufacturers continue to innovate
In the past, most of the LED backlights on the market used an edge-lit architecture. However, in recent years, mini-LED transfer technology has become more mature, and this trend has given birth to the rise of full-matrix area dimming LED backlight technology. The full matrix area dimming LED backlight can meet the specifications of high-end displays such as Display HDR 1000/1400 and HDR. It adopts a direct-lit architecture to achieve precise local dimming and can display images according to each area. The content adjusts the light and shade changes, presenting an excellent contrast effect and detail performance, which greatly improves the detail and authenticity of the picture.
Edge-lit and direct-lit backlight architecture comparison
Compared with the static LED backlight driver chips commonly used in the market today, Macroblock’s scanning architecture has three competitive advantages when applied to high-zone dimming:
Use a small number of chips to drive high-area dimming: Scanning architecture technology allows users to use a minimum number of LED backlight driver chips to drive high-area dimming. Taking driving area 2304 as an example, it only needs to accumulate six 48-channel 8-line scan LED backlight driver chips. However, if it is a static LED backlight driver chip, a 16-channel driver chip can only drive 16 areas. That is, to drive the area dimming backlight in the 2304 area, at least 144 LED backlight driver chips are needed to achieve.
Save the total number of additional drive circuits: the use of scanning architecture can significantly reduce the number of wiring, greatly improve the layout of the drive circuit, and effectively reduce the cost of the drive circuit. Take the area dimming that supports the 2304 area as an example. Under the design of a separate lamp driver, at least 2305 (2304+1) driver circuit wirings are required between the driver board and the lamp board. However, if the accumulation scanning architecture technology is adopted, the scanning is performed in 2 lines. As an example, only 1154 ((2304/2)+2) drive circuit wiring is required.
Reduce the peripheral cost of the driving circuit: The number of PCB layers is also an important source of cost in the design of high area count backlights. Compared with static architecture, the scanning architecture can help customers greatly reduce the material cost of the overall solution. Generally, a static structure requires a 4-layer PCB, and through optimized pin placement, Macroblock can complete the entire LED backlight to drive circuit design with only a 2-layer PCB, reducing the cost of the PCB by half.
Based on the above advantages, it can be concluded that the “scanning architecture” is more suitable for dimming the high area count of the LED backlight than the “static architecture”. A small number of chips can drive the dimming of the high area count and greatly save the total number of driving circuits. And the peripheral cost of the drive circuit. Macroblock LED backlight driver chips MBI6328 and MBI6353 are both very suitable for backlight applications with high-zone dimming. From all aspects, it is undoubtedly the best choice for high-zone dimming.
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