Is OLCD just a gimmick, or is it a display technology that can compete with flexible OLEDs?

FlexEnable recently announced that it has received a strategic investment of 5 million euros from Novares, a global automotive industry solution provider, to help FlexEnable accelerate the industrialization of flexible organic liquid crystal displays and promote OLCD (Oraganic Liquid Crystal Display) in automotive interiors. Used in.

Is OLCD just a gimmick, or is it a display technology that can compete with flexible OLEDs?

With the wave of flexible AMOLED, OLCD has also begun to heat up in the display industry in the past two or three years. FlexEnable has exhibited OLCD samples based on OTFT backplanes several times, and is working with Truly to promote OLCD mass production.

However, a display industry veteran poured a cold water on OLCD. He believes that OTFT is not the key to OLCD. A-Si TFT and LTPS TFT can be used on flexible substrates. And if you look at the cost of materials, even if OLCD can be successfully industrialized in the future, it is better than flexible OLED.

In the end, OLCD is just a gimmick, or is it a display technology that can compete with flexible OLEDs?

OLCD is coming back.

Along with the boom in flexible AMOLED investment in mainland China, the unfortunate OLCD display technology has begun to rush around and actively feel the presence at major exhibitions.

FlexEnable is a typical representative. FlexEnable has long been expected to cut directly into flexible AMOLEDs. As early as 2015, FlexEnable successfully cooperated with CPT to successfully develop the world's first "full color" flexible AMOLED display. But this was only a short-lived hand, and did not allow FlexEnable's OTFT technology to glow on the production line.

The new AMOLED production line invested by mainland China adopts LTPS TFT technology, and LTPS TFT has already become a trend in the field of flexible AMOLED. FlexEnable did not hang on the flexible AMOLED and immediately turned to OLCD. In 2016, FlexEnable demonstrated a 12.1-inch flexible organic thin-film transistor liquid crystal display based on a plastic substrate, which attracted a lot of attention.

According to Paul Cain, director of strategy for FlexEnable, FlexEnable OLCDs can be produced with a little modification on the old LCD line, for example, removing CVD and adding a slit-squeezing coater, resulting in significant cost savings. At the same time, it can be extended to 8 and 10 generation production lines. The relatively weak confidence on flexible AMOLEDs smells OLCD business opportunities. In 2017, FlexEnable signed a technology transfer and license agreement with Truly to provide opportunities for OTFT technology to move from laboratory to industrialization in the display field.

In the same year, JDI introduced a flexible liquid crystal display panel based on a plastic substrate. Unlike FlexEnable technology, JDI improves the LTPS process to the LTOS (Low Temperature Oxide Semiconductor) process to form a process TFT on a PI substrate at a lower temperature. However, flexible liquid crystal display panels are still in the development stage.

Unlike flexible liquid crystal displays, 2018 may be the turning point of OLCD. Although OTFT technology has been around for a while, in the past two to three years, OTFT mobility has surpassed a-Si. In an interview with China Electronics News, Paul Cain said that the mobility of FlexEnable OTFT is now about 1.5cm2 / Vs, about three times higher than a-Si. This has led to a proliferation of OLCD applications, including smart appliances, cars, tablets, laptops, digital signage and other applications.

Paul Cain further pointed out that at the end of 2018, the OLCD display will be put into production, and batch products will be off the assembly line early next year. Xinli Shanwei Factory mainly produces small and medium-sized 5 inch to 20 inch flexible OLCD products, which are planned to be used in smart phones, tablet computers, small-sized electronic billboards and other fields. "I believe that flexible OLCD screens will explode in many areas in the future," said Paul Cain.

In fact, not only FlexEnable, but also more OTFT companies are flooding into the Chinese mainland market. Feng Linrun, vice president of DeuDrive and general manager of Wuhan Xinchuang Chuangruo Optoelectronics Technology Co., Ltd., said that China is the largest manufacturing center of TFT, and all OTFT manufacturers put more than 50% of their energy in the Chinese market. In 2018, DeuDrive also established Wuhan New Drive Chuangruo Optoelectronics Technology Co., Ltd. in mainland China.

OTFT is not very mature and there are several mountains to be climbed.

OLCD is the only display technology that offers large size, high brightness and long life for flexible displays. OLCDs that look like OTFTs are beautiful, but there are still a few mountains that need to be overtaken.

From the perspective of preparation, OTFT is not very mature. Xu Zheng, a professor at Beijing Jiaotong University, pointed out that lithography on inorganic materials is very easy, but lithography on organic materials is difficult to achieve patterning. Therefore, OLEDs are now directly evaporated by a fine metal mask (FMM). If the OTFT is also vapor-deposited, the structure is more complicated than the OLED. Paul Cain revealed that FlexEnable's OTFT uses an inkjet printing process, but it has also been pointed out that even with solution preparation, it is impossible to form a pattern of an extremely small organic semiconductor film.

From the perspective of mobility, although OTFT exceeds a-Si TFT, between a-Si TFT and LTPS TFT, a-Si TFT and LTPS TFT are more mature, and LTPS TFT is not difficult to achieve flexibility. Not obvious. Xu Zheng pointed out that OTFT mobility is higher than a-Si TFT, but it is far less than LTPS TFT and IGZO TFT, and flexible LTPS TFT is now very mature, OLCD does not necessarily need OTFT. Moreover, the OTFT is an organic thin film transistor, and like the OLED, there is a problem of lifetime.

From the development of organic semiconductor materials, it has been pointed out that n-type organic semiconductor materials are developing at a slow rate, and most of them are p-type organic semiconductor materials, which are driven by mature amorphous silicon NMOS processes and low temperature polysilicon CMOS processes. The poor compatibility of the device is related to the CMOS driver requirements even if it is not used for display devices and is used for general logic circuits.

It is understood that FlexEnable has made 12.1-inch, 4.7-inch OLCD samples based on OTFT. According to Paul Cain, FlexEnable's 4.7-inch OLCD can be 0.3mm thick, plus a backlight of 0.5mm, so the entire flexible OLCD screen has a thickness of 0.8mm and a radius of curvature of 10mm.

Paul Cain explained to the China Electronics News that the in-line radius of the side-entry LED backlight OLCD can be 10mm, which will not significantly change the brightness uniformity of the backlight.

Although FlexEnable is trying to break through the bottleneck of OTFT technology and promote the commercialization of OLCD, it has not fundamentally solved the above three problems of OTFT.

OLCD is still unable to compete with OLEDs during the sample phase

LCD flexibility is not a new topic. In the process of LCD thinning and thinning, flexibility will naturally become a new research direction. An industry veteran pointed out that in the past 20 years, people have been trying to make LCD flexible, but the LCD structure is too complicated, requiring backlights, light guides, polarizers, PI, etc. Even if it is successfully flexible, it is difficult to mass-produce. Japanese panel companies and Taiwanese panel companies have long started to develop OLCD technology. Some experts said: "If OLCD is really mass-produced, it has been successful many years ago."

Moreover, the liquid crystal of the LCD is between the liquid state and the solid state, and becomes a solid state in a low temperature environment, and may become a liquid state in a high temperature environment, and it is difficult to adapt to an environment with a relatively large temperature change, which is a fundamental problem of the LCD.

At present, most panel manufacturers have placed flexible panels on OLEDs, and invested in a number of 6th generation flexible AMOLED production lines, some of which have been successfully mass-produced and supplied to terminal manufacturers. Representatives of supply chain companies pointed out that a technology can not be feasible, only by looking at the input of equipment manufacturers, equipment manufacturers are now developing flexible OLED equipment, and rarely develop OLCD equipment.

Since the OLCD trend has gone, why do people continue to invest in R&D and mass production? Industry experts pointed out that flexible OLEDs are unstoppable, and they are forced to take the OLCD researched many years ago. Now that OLED investment is too large, most Japanese companies are afraid to invest, but they cannot but develop new technologies and can only move OLCD out. "I know that I can't do it but I have to do it." However, it has also been pointed out that LCD panels are now the main force in the display industry. If OLCD can be mass-produced, it is an important upgrade for LCD panels.

At present, some companies in Europe are seeing the rise of China's panel industry, and they want to industrialize the technology accumulated over the years. One of the technologies is OLCD. PaulCain believes that the relationship between OLCD and flexible OLEDs is not a competition, but a complement. In large-size or long-life, high-brightness flexible display applications, flexible OLEDs are not a viable solution for the time being, and OLCD has an advantage. OLCD is suitable for smart appliances, automobiles, digital signage, notebook computers, monitors and other applications.

Indeed, at present, flexible OLEDs are not perfect, and there are problems such as high price and long life. But experts pointed out that the price of LCD is also very expensive when it is popular. With the advancement of technology and the cost of materials and equipment, LCD is now very cheap. OLED is undergoing such a process. The cost of rigid OLED is already lower than the same specification. LCD, the future price advantage of flexible OLED will also be reflected. OLED lifetime is also growing at 25-30%, and it has been able to meet the needs of consumers in the field of mobile terminals.

Whether it is a flexible OLED or an OLCD, it is not a perfect flexible display technology. At present, OLCD seems to be ignored by most mainstream LCD panel manufacturers, and almost no panel manufacturers try to mass produce OLCD. They prefer OLED in flexible display technology. On the one hand, they invest heavily in the 6th generation flexible OLED production line, and on the other hand, they are trying to overcome the technical problems of printing OLED industrialization.

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