Strong University | OLED New Light-emitting Technology, Let the Screen Fold

Release Date:2020.05.01 Views:799 Source:

At present, the OLED market has a certain scale, and it is likely to take the advantage of Dongfeng to fully realize a new round of change in display technology.


Since October 2019, Rouyu Technology launched the world's first folding screen mobile phone, and the clever integration of tablet + mobile phone has made this product popular worldwide, in short supply. Not long ago, the OLED market leader, Samsung, also launched the folding screen mobile phone Galaxy Z Flip series, which caused a heated discussion among the people about the folding screen. Once again, the appearance of the folding screen has successfully brought the application of the folding screen into the public's field of vision, refreshing the public's further understanding of the folding screen.


Soft school

Galaxy Z Flip


In fact, the realization of folding screens, and even the curved screens of many mobile phone applications today, are indispensable for such a technology-OLED.



OLED has significant advantages over LCD


Good visual experience

A large amount of research data shows that the advantages of OLED screens will be more obvious in small and medium-sized mobile devices. Its high contrast and wide viewing angle, as well as high resolution, will bring a good visual experience. In the market, Samsung's OLED uses separate coloring of RGB, that is, independent material light emission method, the performance is superior, and LG's OLED TV uses white light through the color filter method, the performance is moderate.


Comparison of OLED color methods



Lighter and thinner

Due to the self-luminous characteristics of OLED, no backlight is needed, especially OLED flexible devices based on polymer substrates, which can make the screen material thinner and lighter and make the equipment more convenient.



Bending, folding, capricious concave shape

OLED can be made into a curved screen, even bent and folded. Because of its easily deformable characteristics, OLED screens are also more resistant to impact.



Timely response in dynamic environment

OLED has a low delay rate and fast response speed, and can capture every detail of the dynamic picture in time without tailing. It is very suitable for VR head-mounted display devices that have high requirements for dynamic capture of details. Taking advantage of OLED's material advantages, "black technology" such as naked-eye 3D screens and on-screen fingerprint recognition can also be implemented on mobile phones.



Application of OLED in AR/VR



Low power consumption, huge power saving

With the characteristics of low power consumption, in fact needless to say. This is the key link that many equipments want to improve. For example, the power consumption of a 2.4-inch OLED in a garden is 440mW, while the power of a polysilicon LCD of the same size is as high as 605mW. OLED can effectively improve the outdoor standby and use time of portable devices such as mobile phones and tablet computers.


Simple process

The process flow of OLED is simpler than the process flow of LCD, and it has obvious advantages in the process of CELL into boxes and post-assembly.



Comparison of LCD production process and OLED production process



Normal operation at low temperature

 Outdoor mobile phones found that the display screen does not work or black screen is a common phenomenon in the winter in the north. The wide temperature characteristic of OLED technology enables the display to operate normally in low-temperature environments, which can meet the needs of portable and wearable devices under cold outdoor conditions. The high-match OLED wide temperature range can also be applied to special military and aerospace technologies.



Comparison of characteristics of OLED and TFT-LCD



Wide range of applications

In terms of application, OLED is used in a wider range of scenarios than LCD. In addition to familiar household appliances and electronic products, it is more promising to enter the following two fields: (1) Cars, such as OLED revolvable lights; embed flexible screens into the block Windshield is fine. (2) Medical wearable equipment. For multiple important parts such as skin, hair, heart, etc., the flexible OLED is used to conform to the contours of different parts, and the patients are monitored in real time.



High-tech applications of OLED



OLED processing is difficult: the first stage depends on "steaming", the second stage depends on "cutting"


You may think that OLED performance has so many advantages compared to LCD, and quickly produce in large quantities. However, things are not that simple.


The production process of the OLED screen has certain difficulties: the front section depends on "steaming", and the rear section depends on "cutting"!


"Steam" in the front

Vapor deposition is the key to the OLED manufacturing process, which directly affects the display of the OLED screen. The job of the vapor deposition machine is to accurately, uniformly and controllably vaporize the OLED organic light-emitting materials onto the substrate. Organic materials used in a large number of OLED display panels are very susceptible to the influence of oxygen and water, and pollution is also easily caused between organic materials. Therefore, the evaporation of the panels is generally carried out under vacuum and independent of each other.


Evaporation process


Through current heating, electron beam bombardment heating and laser heating, the vaporized material is evaporated into atoms or molecules. They move in a linear motion with a large free path, collide with the substrate surface and condense to form a thin film. This process is vacuum. Evaporation.


In layman's terms, every pixel of an OLED screen is steamed up. In addition to luminescent materials, metal electrodes, etc. are also steamed up, the actual operation is very complicated.


The rear section is "cut"

After the OLED screen is made, the shape must be precisely cut, which requires high cutting accuracy. Stronglaser's hard and soft screen laser cutting machines for the OLED industry are manufactured to meet this high level of good cutting. The cutting accuracy can reach ±30μm, and the heat affected zone is kept within 30μm.


Stronglaser OLED laser cutting machine can process any shape of hard screen and soft screen, such as special-shaped cutting, chamfering/rounding, digging groove, digging hole, etc., the cutting surface is smooth and without burrs. Stronglaser OLED laser cutting machine can be accurately positioned/detected through a high-precision visual CCD machine vision system: real-time monitoring of track accuracy, cutting track heat affects HAZ and other edge effects, which can provide a strong guarantee for high yield.


Stronglaser OLED laser cutting machine also has a significant advantage: it is extremely efficient, and can process 3-12 inch AMOLED displays every 4-7 seconds.



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