The Dilemma of Inductive Technology Thinking in the Micro LED Market 

 

Due to the technical difficulties of reducing the pixel chip size and pixel pitch, in the past five years, although many samples have been displayed, in the final product, Micro LED can only achieve the target high resolution by increasing the screen size and relaxing the viewing distance.

 

 This also makes entrants from TV manufacturers SONY, SAMSUNG, to China's display billboard factory, TV factories to  invest the production of 100inch micro led TV.

 

This type of mini LED size -micro LED solutions are launched by Japan, South Korea, and China makers, hoping to find opportunities for commercial needs such as big data centers,  security monitoring, or theaters.

 

​ In addition, because the micro led display chips required for watches, mobile phones, and car displays have evolved from super-large displays through medium-size to small-size displays, the technical difficulty is constantly increasing. , so far no manufacturer's product is mass-produced.

SONY Crystal LED: The pioneer of micro LED display

Image right:SONY
Image right:SONY

display modules

Image right:SONY
Image right:SONY

Crystal LED

Image right:SONY
Image right:SONY

Crystal LED

Image right:SONY
Image right:SONY

display modules

Still not mass production with micro LED by 1"~80" in 2021

3 pixel difficulty.JPG

Facing the competition of oled, micro led cannot be mass-produced for small-size displays including 2" watch , 6" handsets, 12" car dispaly since 2017.

Therefore, easier way to demo micro led is still the TV, the 80inch to 100inch that Samsung announce for sale  from this year can be used to compare with the price-performance ratio of oled large-size TVs. Whether there is a consumer market for micro led tvs below 100 inches will be clear soon.

Full range size 1"~100" by OLED tech has already on sale in the Market :

Watch, handsets, laptop, car panel, TV

截圖 2021-04-05 上午10.16.21.png

What about car panels? by micro led ?

 

LED manufacturers believe that OLED cannot be used in car display instruments and control panels. Because of its reliability,  but let’s take a look at the Mercedes Benz S-Class and EV-car EQS that will be launched in 2021. A amazing full scale OLED dispaly in Car.

videio source Mercedes -Benz https://www.youtube.com/watch?v=KitQQHm0Eoc

The final solution of AR,VR display, micro LED or micro OLED?

In addition to displays, European and American manufacturers and few Asian startups are mainly focused on the development of micro led technology that can be used in AR applications, including plessey, glo, jbd, and other manufacturers.

As for the micro led pioneer ,luxvue, which has the most mass transfer related patents. The news about Luxvue has gradually decreased in recent years. In the display application market, people think whether the direction of technology of micro display has shifted, such as micro OLED?

1 MICRO OLED MAKERS.JPG

The PPI request of display :AR,Watch,Car panel, TV,Large Display 

We still have a technical need to solve the problem of the PPI distinguishing ability that the micro LED  demo on a small display screen. Even if a high PPI is displayed, it does not mean that the color separation rate of each pixel is excellent. This is the main question why people look at the samples at the exhibition. Why is it not as good as the technical indicators show, the color separation and red display, and the light mixing cannot meet expectations on a single pixel.

Micro LED display Patent without Red AlGaInP material

Regarding the issue of red materials, we developed a three-color micro-LED technology that does not use AlInGaP materials to solve the red problem, and has a specific lens structure design to make the light achieve good color quality, and we obtained a patent in 2012. It also develops and owns US patents on wafer-level mass transfer micro LED technology and micro LED RGB hybrid display unit without AlInGaP LED.

1 principle of simpilicity.JPG

Stream and not only in living room

stream by phone

stream by phone

stream by pad

stream by pad

Car panel

Car panel

LG OLED TV

LG OLED TV

stream by laptop

stream by laptop

theater

theater

What we are thinking, the next step of micro LED

Genesis photonics (gpiled) is based on  the principle of physical simplification to develop the next tech

For micro LEDs, we have never considered the mass transfer of two different materials as the main solution. The large-scale transfer of two different materials, RGB, has not yet been examined in the actual production situation. Although LEDs have a longer service life than OLEDs, Micro LEDs face more challenges than the information presented in the media. However, the luminous attenuation of RGB three-color LEDs is still different. After a period of use, the reliability of the red light will show problems. There may be a gap in the brightness and color of each RGB LED, and it is difficult to control the quality to a small difference.

Below is our though in different application with micro LED 

Large size display :

Currently on the market> 100-inch displays are miniaturized or COB or COG based on RGB existing technology. Due to the distance field of view, the actual chip size does not need to be minimized <50 um, and by about 75~100um. Therefore, related manufacturers' investment in micro-packaged RGB will bring business opportunities to the special field of indoor large screen applications. Therefore, Japanese, Korean, Chinese, and Taiwanese panel manufacturers will invest in this new application field to compete with traditional display signage manufacturers.

TV:

The technical chip size of a 100-inch TV is about 75~100um. It can't really show the true technical strength of micro LEDs. In addition, as a consumer, the cost that is willing to pay is in the content and price of the hardware display (the price position of mini LED TV and OLED TV  is more suitable). As for using blue light of micro LED to excite quantum dots, or using blue and green InGaN wafers and QD excitation, continue to pay attention to whether the development of related industries can compete with 80-inch to 100-inch OLED TVs?

 

Laptop, car, mobile phone, watch:

Can the tiny size of micro LEDs compete with AMOLED? With the principle of physical simplification that we have always adhered to, compared with AMOLED, this small development of about two inches still has conflicting behaviors in physical simplification.​

AR:

The real Micro LED as an AR display application requires a certain degree of brightness, which is where micro LED is superior to oled, but requires high ppi. Therefore, the size of micro LEDs developed is <5um, and the micro LEDs currently developed on the market are mainly based on silicon. The technological development of this miniature LED is a cause for concern. Interestingly, a few  companies focus on monolithic RGB  micro LED without AlInGaP to achieve possible AR optical functions, while more innovative and aggressive companies  use InGaN on Si  to achieve 3-color without  AlInGaP red . But so far, InGaN red light is too weak. Maybe it still needs the QD Red method for mass production. ​

 

Transparent display:

Therefore, for the application of micro leds to displays and micro-projectors, manufacturers have successively proposed to switch to transparent display combined with automotive glass, but this is not only a matter of the cost of automotive glass, but also involves the safety of the more important driver’s vision focus. With three years have passed and only conceptual ideas have been put forward.

Our thoughts:

Where is the holy grail of micro led applications? Every company has its own ideas. We believe that in the display application range of 2"~100", there is a conflict between micro led and oled, and we have accumulated patented three-primary-color single-chip technology over the past two decades. , We will focus on the non-display application market and the non-oled battlefield, and continue to move towards the goal of avoiding the transfer of huge amounts of chips and keep focusing on the  wafer level micro LED dies transfer tech. Of course, the micro pixel without AlInGaP material is necessary.