American CES show Mini LED shining, TCL CSOT guides a new trend of display

Mini LED backlight has become an important direction of LCD panel upgrade. TCL demonstrated its next-generation display technology, the Mini LED, at the annual consumer electronics show in Las Vegas. The display screen of this product is from TCL China star Mini LED screen, showing the scientific research strength of TCL China star in the field of display to the world.

In the display area, HDR has become the standard for high-end TVS, and the Mini LED technology can easily achieve the current HDR standard. In the future, Mini LED will accelerate the penetration of the display market and return the display to the picture quality itself, which will also improve the situation that LCD panel products have no fighting power over OLED panel products in terms of market share.

Multi-giant Mini LED

Mini LED is becoming the "darling" of the display field. Since 2019,TCL, apple, hisense, asus, innolux, au, boe and other giants have successively launched Mini LED backlight or similar technology of TV, display, VR, in-car display and other terminal products.

As early as January 2019,TCL released the Mini LED backlight product as TCL X10 QLED 8K TV, with a screen size of 75 inches, a resolution of 8K(7680*4320) and a screen ratio of 16:9.In addition to TCL, more giants also launched Mini LED backlight products. Asus released the Mini LED backlight product ProArt PA32UCX in January 2019, while acer released the Mini LED backlight product Concept D CM7321K display in April 2019.Also, according to a report from Digitimes, apple plans to launch Mini LED backlighting products in late 2020 or early 2021, including a 10-12-inch iPad and a 15-17-inch MacBook.

So what is the force driving the Mini LED to become the darling of the display world?

Compared with OLED, Mini LED backlit LCD has the advantage of being able to achieve the display effect comparable to OLED panel at a lower cost, thin and light experience, with the capability of mass production, longer life and lower power consumption. Mini LED backlight can be combined with a flexible substrate to achieve a curved display similar to OLED, and has an advantage over OLED in terms of light source reliability.

Today, the Mini LED is growing at a phenomenal pace. Many far-sighted enterprises are optimistic about its future development trend, one after another to participate in the "cake", LCD display panel giant beach Mini LED seems to have become a "trend". For example, TCL CSOT MLED screen is the world's first tft-lcd process combined with amorphous silicon glass substrate to drive the active Mini LED display products, this is a new technological revolution, the potential of Mini LED to the fullest.

TCL China star MLED screen is committed to improving the display quality in an all-round way. The NTSC of the screen is as high as 100%, which increases the enjoyment of color gamut by 38%+ compared with ordinary products, and 100% restore the real wonderful scene without missing any color. The picture quality experience is comparable to OLED, which can bring a new shocking visual experience to the viewer. Conventional LCDS typically have a contrast ratio of about 1,000:1, while dual screens have a static contrast ratio of about 500,000:1.The contrast ratio of TCL CSOT MLED screen is up to 1 million :1, with more perfect detail performance; OLED displays show "image persistence" or "burning", when a new image appears on the screen, it still shows some remnants of the previous image. TCL CSOT screen has a solution to solve the phenomenon of residual shadow, dynamic picture more smooth and clear.

In addition, TCL CSOT initiated the glass substrate integrated LED scheme, which is green and environmentally friendly and supports sustainable development. The LED high luminous efficiency and MLED 5000 zone dynamic dimming can save energy more efficiently. Compared with a Mini LED product On PCB, 182 500ml plastic bottles were saved. In addition, the energy consumption of star screen can be reduced by 60% compared with OLED products. If the 75-inch product is opened for 12 hours a day, the power consumption of star screen will be 1515 degrees less per year than that of ordinary products, which is equivalent to the electricity consumption of a family of three in a year. The environmental benefit is equivalent to planting 40 square meters more forest.

"High threshold" good leading enterprises

However, to eat the "cake" in the Mini LED field is not easy, mainly because the Mini LED threshold is high, there are many difficulties in the current technology. Specifically, in the chip segment, the size of Mini LED chip is significantly smaller, so the wavelength consistency and thickness uniformity are required to improve, and the yield control is difficult to improve. In the packaging part, the chip size is reduced, the cutting part is required to be improved, the lamp bead size is reduced accordingly, and the transition to the new process such as four-in-one or COB increases the difficulty; In the process of integration, manufacturers need to fix thousands of Mini LED chips to PCB substrate or glass substrate. Although there is still a qualitative difference between Micro LED and huge transfer, it is significantly more difficult than traditional LED products.

The technical difficulty of Mini LED in chip size, packaging technology and module integration is not low. In addition, the backlight module of Mini LED is usually made on PCB board. Due to the large variety and small quantity of Mini LED at the initial stage, PCB cost is usually expensive.

Who can be the first to solve these technical problems will have a head start when it comes to dividing the Mini LED "cake". TCL China star, which holds a number of core patents, is more capable of solving these technical problems. In 2018,TCL submitted a total of 1,607 applications for PCT international patents, a total of 9,990 applications, covering Europe, the United States, South Korea and other countries and regions. By the end of 2018,TCL had applied for 36,389 Chinese patents and 8,363 us patents. Among them, TCL CSOT had applied for 14,372 Chinese patents and 7,684 us patents, leading Chinese enterprises in terms of core technology patents. TCL has 757 open patents in the field of quantum dot electroluminescence, ranking second in the world.

With a large number of technical reserves and patents, TCL China star developed the first 75-inch 8K MLED screen, the first time to replace PCB with a glass substrate as the LED back. MLED has a competitive advantage over the conventional on PCB Mini LED and WOLED module components.

The technical difficulties of installing Mini LED on the glass substrate are reflected in the substrate production process and SMT batting process. In order to ensure a good welding effect, TCL CSOT adjusted the production process sequence of the substrate and optimized the manufacturing process, so as to solve the problem of easy oxidation of Cu and ensure that other characteristics of the adjusted substrate would not be affected. However, in SMT process, TCL CSOT solved the abnormal problem by repeatedly adjusting the size of steel mesh and the tin content. In addition, TCL CSOT also through innovative process optimization to ensure the overall brightness uniformity.

TCL CSOT's Mini LED on glass has made technological breakthroughs in terms of substrate design, SMT process, module assembly and driving algorithm. In terms of substrate design, TCL CSOT has optimized the wire routing and wire width design for large current drive. Optimized LED layout design for optical effect; In SMT process, TCL CSOT optimization process made the yield reach the expected; On the module assembly, the cooling effect and strength of the module are up to standard by optimizing the cooling and structural design of the module. In addition, TCL CSOT also adopts the new technology independently developed in the driving hardware and software algorithm, to optimize the effect of LED Local Dimming and display.

In addition to having a large number of technical reserves and patents, TCL CSOT also has the world's largest production line of G10.5, which is conducive to the production of super-sized Mini LED on Glass products .In addition, TCL CSOT has the advantage of vertical integration, and its products can be quickly mass produced in the whole machine.