LEDs are becoming more and more widely used in the automotive field. However, the exhaust gas of automobile exhaust, cigarette smoke, sealed rubber exhaust gas and the silver widely used inside the LED may undergo a vulcanization reaction, resulting in a serious decrease in the luminous flux of the LED, a significant shift in the color temperature, and even a dead light phenomenon. When the car's brake lights, direction lights, tail lights, etc. appear LED vulcanization phenomenon, it will directly affect the driving safety of the car.
How to adapt the LEDs on the car to an increasingly harsh environment? Recently, ROHM, a world-renowned semiconductor manufacturer, has released the industry's first silver-free high-brightness red LED "SML-Y18U2T", which greatly improves the reliability of automotive lamps, especially brake lamps, used in harsh environments. ROHM Optical Module Production Headquarters LED Manufacturing Division Commodity Planning Team Leader Yoshida Kojiu, Deputy Director of Design Center of Roma Semiconductor (Shanghai) Co., Ltd. Suwon Dejian held a press conference to describe ROHM's super product and ROHM in The LED field has been working hard for many years.
ROHM Optical Module Production Head of the Product Planning Group of the LED Manufacturing Division of the Ministry of Yoshida Yoshida
Suwon Dejian, Deputy Director of Design Center of ROHM Semiconductor (Shanghai) Co., Ltd.
ROHM and LEDAccording to Shuiyuan Dejian, deputy director of ROHM Shanghai Design Center, ROHM, which was founded in 1958, began producing LEDs in 1973. It can be said to be the pioneer of LED production. The following picture shows the history of ROHM in LED products. Mr. Shuiyuan particularly emphasized the few nodes that are proud of, namely, since 1973, the production of green-light patch LEDs in 1996, the launch of Blu-ray patch LEDs in 2002, and the introduction of PICOLED (ultra-small, ultra-thin) in 2007, 2009 Ultra-high brightness, thin red, green and blue (RBG) production began. In 2013, the lens surface mount LED, the 2016 ultra-small high-brightness RGB with reflection, and the 2017 industry standard 1608 product lineup were launched on the market, highlighting ROHM. Years of unremitting efforts in the field of LED.
Thanks to its strict quality management and vertical production system, ROHM has achieved the advantages of miniaturization, single brightness level, universal color and anti-vulcanization. Mr. Shuiyuan introduced that quality management includes chip design for easy assembly process execution, implementation of traceability system for ultra-small products, and process management system corresponding to vehicle-grade quality. The vertical integration production system is also called the consistent production system. Its core charm is that both the old product and the new product development insist on the independent completion of the ROHM from the component to the finished product.
ã€miniaturization】The demand for products in the market is becoming smaller, thinner and lighter, and the use of ROHM's unique production technology to achieve thinner components and reduce the loop of gold wires to achieve the industry's thinnest height of 0.2mm.
From the beginning of the component manufacturing stage, the technical advantages are incorporated and the quality concept is strictly implemented to eliminate brightness fluctuations.
Considering that color recognition varies from person to person, for example, the color recognition of a weak person is different from that of a normal person. In product design, ROHM uses a color that is easily recognized by a weak person to improve recognition. Mr. Shuiyuan told reporters that the production of universal color products is not much, and it is entirely for the small crowd.
According to statistics, because the silver used inside the LED is affected by environmental gases (automobile exhaust, smoke, sulfur gas, etc.), the problem of vulcanization is increasing. For example, the silver mirror surface layer in the chip may cause poor component characteristics due to vulcanization. The brightness is lowered and the bonding is peeled off, and the silver plating frame is also lowered in brightness. In order to avoid these problems, ROHM's anti-vulcanization LEDs have effectively played a role.
In order to challenge the troubles and problems caused by vulcanization for automotive LED brake lights, ROHM recently launched the industry's first anti-vulcanization silver-free high-brightness red LED "SML-18U2T". Yoshida Koji, head of the product planning group of the LED manufacturing department of the optical module, said that it is very suitable for anti-vulcanization measures of automotive brake lights and helps to improve long-term reliability.
"SML-18U2T" replaces the silver used in the conventional die bond solder paste and frame with other materials such as gold, and achieves no silver. This eliminates the LED brightness degradation caused by corrosion of the silver, which improves the reliability of the application.
Conventionally, there has been a problem that the solder paste portion used for bonding the element chip is blackened, resulting in a decrease in the luminous intensity of the LED. However, ROHM utilizes the advantages of the vertical integration production system from component to package. The chip bonding adopts gold-tin (AuSu), the lead is made of gold, and the frame adopts gold-palladium (AuPd), which realizes completely silver-free, so that the product has both products. High brightness and excellent resistance to vulcanization.
In the vulcanization test, the luminous flux of products using silver-plated frame and silver paste in the past is 70% after one cycle (24 hours) and 60% after 10 cycles. The longer the time, the lower the luminous flux; After 10 cycles (240 hours), it still maintains almost 100% high luminous flux.
Mr. Shuiyuan told reporters that ROHM's LED products are used in many fields. Industrial control and automobiles can account for about half of Roma, followed by entertainment and consumer products, accounting for about 25%. The production of ROHM LEDs is expected to be 1.3 times in 2015, and the market is recovering very quickly. In the automotive market, ROHM is mainly in audio, navigation and air conditioning panels. There are also a variety of RGB products used on the dashboard of electric vehicles. Future car dashboards, taillights, and brake lights are all ROHM-locked markets. ROHM can account for about 27% of the industrial control. The most important thing in industrial control is the indicator light of various devices or the display of 7-speed, such as the display outside the Shinkansen and some light sources of the sensor. In addition, the market for ROHM in the consumer electronics field is also very large, mainly including various indicators and electronic cigarette light indicators on PCs and game consoles. The electronic cigarette market accounted for 13% of the turnover last year.
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