People in the screen industry are aware of a pain point: customers always complain about "colors not being bright enough" and "looking gray". You also want to improve the color gamut, but traditional solutions are either too expensive or too complicated to modify.

Today's article will explain to you a highly cost-effective solution: quantum dot film backlight. By understanding it, you will know how to use LCD to produce colors that are even more beautiful than OLED.

1、 Why do your screen colors always seem dull?

First, let's take a look at a set of data: the NTSC color gamut values of traditional TFT-LCD displays are generally within72%Left and right, while self luminous OLED can achieve 100%.

The gap is there, red is not red enough, green is not green enough, the color always feels dirty.

The problem lies in the backlight.

The vast majority of LCDs on the market use blue LED chips paired with yellow phosphors to produce white light. The spectral energy of this scheme is mainly concentrated in the blue and yellow regions, while the energy in the red and green regions is severely insufficient.

That's why your screen always misses the mark when displaying red and green. It's not the panel that doesn't work, it's the backlight that can't provide pure primary colors.

For example, if the paint used for painting is impure, the resulting color will naturally turn gray and dark.

2、 What kind of technological innovation is quantum dot film backlight?

Quantum dots are nanoscale semiconductor materials with particle sizes ranging from 2 to 10 nanometers.

Its core features are:Quantum dots of different sizes emit light of different colors when excited by blue light.The smaller the particles, the shorter the wavelength of the emitted light (bluish); The larger the particle, the longer the wavelength of the emitted light (reddish).

By applying this feature to backlighting, the idea becomes clear.

Traditional solution:Blue LED, yellow fluorescent powder → appears white but lacks red and green.

Quantum dot scheme:Blue LED quantum dot film → red and green quantum dots inside the blue excitation film emit high-purity red and green light, respectively, which are then mixed with the remaining blue light to form pure white light.

The result is that the three primary colors of red, green, and blue are extremely pure, without any color interference.The color gamut can easily achieve 110% NTSC or higher,Higher than many OLEDs.

     
3、 What practical value does quantum dot film backlight bring to terminal manufacturers?

Firstly, color gamut compression.Under the NTSC standard, the color gamut coverage of quantum dot screens is as high as 110%. More vibrant colors, more natural transitions, and more realistic visuals. Your client can see the difference at a glance when they receive the prototype.

Secondly, the color is pure.The spectral "half width" emitted by quantum dots is extremely narrow, and excellent green films can achieve<20nm.

This means that there is very little stray light and the color purity is extremely high. Red is red, green is green, there is no awkwardness of "yellow in red and green in green".

Thirdly, the plan is mature and can be implemented quickly. Quantum dot film backlight belongs to the photoluminescence technology route and is currently a mature and widely used solution.

You don't need to modify the panel production line, just embed a layer of quantum dot film between the blue LED and the light guide plate in the backlight module. Replace the original diffusion membrane, leaving the other structures largely unchanged.

Fourth, lower power consumption.Due to the significant increase in color saturation, the backlight power required to achieve the same visual brightness is actually lower. Data shows that quantum dot film backlight has a higher utilization rate than traditional LEDs, and power consumption can be reduced at the same brightness.

Fifth, the lifespan is guaranteed.Quantum dots are inorganic nanomaterials with stronger stability than organic materials. Combined with high barrier water oxygen film for sandwich packaging, the color is long-lasting and stable.

4、 How to place quantum dot film in backlight module?

The structure is simple:Blue LED backlight source → light guide plate → quantum dot film → other optical films (such as BEF, APF) → liquid crystal panel.

The quantum dot film itself is a multi-layer composite structure similar to a sandwich, with a quantum dot layer in the middle and a high barrier water oxygen film on the upper and lower layers.This design is designed to protect quantum dots from water vapor and oxygen erosion,Ensure longevity and stability.

But please note: it's not enough to just stick a piece of film. Quantum dot films need to be debugged in collaboration with BEF, APF, and the entire panel to achieve optimal results. This is also one of the reasons why the backlight module always comes last in the development process of high color gamut displays.

5、 Two trends that module manufacturers are concerned about

Trend 1: Cadmium free quantum dot film.The EU RoHS standard and domestic regulations both restrict the use of harmful substances such as lead and cadmium in electronic products. The cadmium free quantum dot film has already met the RoHS standard, and relevant environmental standards may be further tightened in the coming years.

Trend 2: Quantum dot composite film.Combining quantum dot films with brightening films and other functions can reduce the number of films in backlight modules and improve assembly yield.

6、 Practice of measuring point film backlight during the competition

So back to the real problem:How can quantum dot film backlight be integrated into your product?

As a manufacturer of LCD display modules, we have been thinking about one thing: how to turn quantum dot film backlight technology into a product that customers can truly use.

We continuously innovate our products at Saishida, using QHD high-definition screens and quantum dot technology to achieve a breakthrough in 145% sRGB color gamut display.

At the same time, the industry's first ultra-thin fully laminated screen is adopted to reduce light loss and ensure a better fit between the pen tip and cursor for anime creators during use, truly achieving the same effect as writing on paper.

Using AG glass and QD film as anti blue light materials, the use of AG glass makes the friction between the digital screen and glass, and the handwriting experience closer to real paper and pen.

Using QD quantum film as backlight, the color gamut is fully expanded, and the display effect is comparable to OLED. Combined with anti blue light design, long-term creation is not tiring to the eyes.

The use of QD quantum film enables the display effect of the product to achieve OLED effect.

AG glass reduces friction between the screen and glass, while minimizing reflection, making the handwriting experience closer to real paper and pen.

144Hz high refresh rate, 4K quantum film high-definition display, 145% sRGB, is a truly useful experience that every creator can feel.

If you are making computer monitors, quantum dot film backlighting can allow your product to directly outperform competitors using ordinary backlighting in professional design, video editing, esports games, and other high color demanding scenarios.

If you are making a laptop screen, quantum dot film backlight can significantly enhance the screen color without increasing power consumption. The same brightness with lower power consumption is a real competitive advantage for laptop battery life.

If you are making various terminal display devices, such as car screens, industrial control screens, and commercial displays, quantum dot film backlighting can help you achieve visual effects close to OLED at the cost of LCD.

To put it simply, quantum dot film backlighting doesn't make you spend more money, it makes you spend the same amount of money to make better products.

To be honest, since our establishment in 2013, what we have been doing at Saishida has been to turn display technology into products that customers can use.

We have been deeply cultivating the path of quantum dot film backlight. From initiating research and development to achieving mass production. To this day, we have accumulated rich experience in mass production and delivery, from backlight modules to full screen solutions, from consumer electronics to digital screens, commercial displays, and industrial control equipment.

If you are worried about the color performance of your next product, why not come talk to us. We have already helped many clients with the quantum dot film backlight issue.

Your product deserves better colors.

Shenzhen Saishida Technology Co., Ltd. is a leading provider of display product solutions and hardware in segmented fields. We specialize in the research, development, production, sales, and service of LCD display modules, providing customers with one-stop display solutions such as LCD display and quantum dot film backlight, high color gamut display, ultra-thin full lamination, etc.

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