Special-shaped cutting develops with full screen demand
We know in the traditional mobile phone screen is 16:9, rectangular, four are rectangular, due to the placement of the front camera, the distance sensor, receiver and other components, so both screen and the upper and lower edge of the fuselage of a certain distance.
And 18:9's full screen phone is more than 80% of the screen, and the edge of the screen will be very close to the phone's fuselage. If you continue to use at right angles to the previous program, no place to place relevant modules and components, at the same time, the body will make the screen screen close to bear more impact in the fall, which led to the broken screen, so in order to reduce the broken screen and may be reserved for the screen space element, processing becomes necessary non orthogonal cutting.
"Special-shaped cutting" is based on the different needs of the screen R angle cutting, U slot cutting, C angle cutting and so on. There are two main purposes: on the one hand, to do C corner or R corner cutting on the four corners of the screen, and to reinforce the edges by adding cushioning foam, so as to prevent broken screens. On the other hand is the need to do U shape at the top of the screen for cutting, front camera, distance sensor, receiver and other components of the reserved space.
The current special-shaped cutting options are mainly: cutter wheel cutting, laser cutting, and CNC grinding as a temporary alternative. It is said that as domestic mobile phone manufacturers are unable to get OLED capacity, the first batch of comprehensive screens still use the LCD scheme. The special cutting scheme for the LCD screen is cutter wheel cutting and laser cutting.
What is cutter wheel cutting and laser cutting?
Round knife cutting belongs to the mechanical processing, no high temperature, does not lead to the edge of the frame and the yellow hot gap, but the product is rough, easy to change the stress characteristics of the glass itself, and the process is complex and the yield is low, the laser cutting sheet is low relative to the processing is not suitable for glass, sapphire and other fine materials the;
Laser cutting uses high-power laser beams to irradiate the cutting material, so that the material is quickly heated to the vaporization temperature and evaporates to form holes. At the same time, the high velocity airflow with the coaxial beam is used to blow out the molten material, and the slit is formed as the beam moves on the material. It has the characteristics of high cutting accuracy, no burr, no deformation, fast cutting speed, and no restriction on processing shape. However, compared with it, it will have high cost.
Analysis of the main machining points of the comprehensive profile cutting program:
At present, the mainstream scheme for profiled cutting is to cut two C angles, two R angles, and a U slot on the screen panel.
The special-shaped cutting is mainly the arc cutting, the cutter wheel cutting and the laser cutting are as follows:
Cutter wheel cutting scheme
1、It caused a serious edge.
2、The cutting efficiency is low. Because of the need to reserve the cutting line for the cutting of the cutter wheel, the utilization rate of the cutter wheel will decrease by 10-20% for the whole Panel compared with the laser cutting, and it takes 2-3 minutes to cut one piece.
So after a brief attempt, the cutter wheel special-shaped cutting has been phased out by the industry.
Laser cutting scheme
1、Laser cutting is non-contact processing with no mechanical stress damage and high efficiency. The same two C angles, two R angles, and a U slot processing scheme can be cut in about 20 seconds.
2、Because the principle of laser cutting is to focus the laser on the material, heating the material locally until it exceeds the melting point, and then blow away the molten metal with high pressure gas. With the movement of the beam and material, a very narrow cut is formed. The precision of laser cutting can reach 20um.
In contrast, laser cutting has an obvious advantage in the special-shaped cutting, and the laser cutting scheme is mainly used in the industry.
Special-shaped cutting laser equipment in the market
The classification of laser is more, from the gain medium, it is divided into solid and gas. The solid-state lasers include Al2O3, YAG cutting, and so on, and the gas lasers mainly have CO2 cutting and so on. Generally speaking, gas lasers are generally 10.6um wavelengths of infrared light. They are widely used. Solid lasers are usually 1064nm wavelengths, with high output power and high peak power. At the same time, in addition to long wavelength infrared laser, and a solid ultraviolet laser (wavelength from 180 to 400nm), UV cutting more for processing polymer materials, by destroying the molecular bond surface of non-metallic materials, to realize the cutting, UV cut also known as cold laser, thermal effect.
From the pulse width time of the laser, it is divided into nanosecond (NS, 10^-9 second), picosecond (PS, 10^-12 second) and femtosecond (10^-15 seconds). The pulse width is about short, the higher the peak power, the lower the heat effect.
From the point of view of cutting scheme, laser cutting is divided into surface ablation cutting and inner focusing cutting, cutting surface ablation can be directly cut through, does not need the subsequent increase in the heat affected zone lobes process; and the inner focus after cutting to lobes separation process, small heat affected zone.From the point of view of cutting scheme, laser cutting is divided into surface ablation cutting and inner focusing cutting, cutting surface ablation can be directly cut through, does not need the subsequent increase in the heat affected zone lobes process; and the inner focus after cutting to lobes separation process, small heat affected zone.
According to the relevant information, the current mainstream laser cutting model is the infrared solid picosecond laser, using the internal focus cutting scheme. The scheme achieves the greatest balance between cost and efficiency. The domestic laser cutting equipment panel manufacturers are mainly: Han's laser, strong laser, delphilaser laser, foreign manufacturers are mainly Japan hirata.
Full screen special-shaped cutting capacity is expected to be released by Q4 in 2017
The full screen will also be linked up with the promotion of OLED display panel. Because the current global production of flexible OLED screens for mobile phones is mainly Samsung and LG. There may be some problems in mass supply at present. However, as domestic manufacturers actively expand the OLED production line, the monopoly market pattern of the supply side of the OLED panel will be gradually broken. According to IHS, by 2020, the share of Chinese manufacturers' OLED panel market will rise to 20%.
In addition to the panel factory, in order to realize the narrow border of four sides, it is necessary to improve the glue processing technology and adopt the GOA scheme. This will push the ASP of the panel to a certain extent. For the module plant, COF and special-shaped cutting all need to purchase new equipment and make a bigger transformation to the existing production line. With institutional analysis, the capacity of domestic COF and special-shaped cutting can be released at Q4 in 2017. The display module ASP, which adopts the special shape cutting scheme, improves 20-30% compared with the traditional scheme. The makers of the preemptive layout will take the first place.
From the current domestic mobile phone screen full schedule development and cost consideration during the year end, the domestic mobile phone screen by cutting the overall penetration rate is still not high, there is still a considerable proportion of the total screen machine adopts anti dropping transitional scheme will fill the screen shockproof materials at right angles of the screen, but the relevant analysis reports, to 2018, the domestic mobile phone flagship model is expected to turn them all into full screen mobile phone, that next year the global comprehensive screen permeability of 30%, about 450 million of full screen mobile phone, bring a lot of incremental cutting demand.