OLED TV uniform illumination problem has been overcome and has mass production conditions

Recently, Seiko Epson invented a new technology called "inkjet uniform film formation", which can make organic materials evenly deposited, which means that large-screen OLED TVs have the conditions for mass production. The sluggish LCD TV market constitutes substantial pressure.

At the SID2009 Display Technology Conference held in Texas, USA, Epson published a paper on the technology. At the same time, a 14-inch Oled display with this technology was demonstrated, which has a resolution equivalent to a 37-inch full HD display | display device.

It is reported that compared with the current LCD LCD display, Oled display has the advantages of high brightness, strong contrast, low heat consumption and low energy consumption, thickness can be as small as a few millimeters, and has ultra-thin soft and curlable characteristics. Even the latest LCD LCD TVs have a thickness of more than 30 mm.

The structure of OLED technology is very simple: the liquid crystal needs a light source, and the Oled product itself can emit light, which can be made very thin and light; on the other hand, the plasma TV realizes display by discharging, the voltage is high, and the power consumption is large for a long time. In contrast, OLED products can save more power.

History is often caused by chance, but it is full of continuity. Since Dr. Deng Qingyun, a Chinese-American researcher at Eastman Kodak's laboratory more than 20 years ago, discovered the beginning of the organic battery in the dark, OLED technology has become a high ground for many manufacturers.

This key technological breakthrough comes from the idea of ​​Epson researchers who accidentally "cross-border thinking" more than a decade ago. One day, Epson's researchers sat down and chatted. One person suddenly asked: "Our inkjet technology is so excellent, can it only be used on paper?" This question immediately triggered a domino-like thinking among colleagues. Then, a series of questions came up. "Yeah, can we use it to print elsewhere?" "Can you use liquids other than ink?" "What are we going to do?" &hel lip ;...

The answer came up, "Print semiconductor!" "Print the board!"

SatoruMiyashita, general manager of Epson's OLED R&D Center, said, "Large-screen OLED TVs are the future of display screens. Epson has been working to promote the mass production of large-screen OLED TVs through the development of inkjet technology."

Previously, an important problem faced by OLEDs was that the most widely used organic material deposition method, vacuum thermal evaporation (VTE) technology, could not solve the problem of uniform stratification of organic materials, and thus could not realize OLED large panels. Mass production of the display.

As a result, the invention of the new technology of "inkjet uniform film formation" is expected. Epson has developed a new OLED display manufacturing process based on its patented MicroPiezo patent technology. According to experts, this technology can precisely control the selection and ejection of different sizes of ink droplets on the photosensitive substrate, so that the amount of deposited material does not exceed the required amount, thus achieving very uniform stratification (error less than 1%) ). It is understood that the process has been applied to the trial production of high uniformity prototype panels.

The advantages of inkjet technology in the production process of OLED TV

The process of forming a uniform film layer of organic material on a glass substrate is a key element in the production of OLED televisions. Currently, vacuum thermal evaporation (VTE) is one of the most widely used technologies. The process using this technique must be carried out in a vacuum chamber, requiring a visor to be placed next to the glass substrate to determine the pattern of deposited material on the substrate. However, vacuum thermal evaporation technology has several major drawbacks in the production of large-screen OLED TVs. For example, the visor is highly susceptible to offset by the high temperature environment in the process, making it difficult to maintain a uniform deposition rate on a large substrate.

Inkjet printing technology can form a thin film layer by uniform deposition of liquid organic materials. Therefore, this technology can theoretically better solve the size problem of large display screens. Epson uses the same drop-on-demand inkjet process as inkjet printers to accurately deposit organic materials in the right amount. Because inkjet systems have a very high material utilization rate, manufacturers can reduce production costs. In addition, when applied to the OLED TV production process, since there is no need to use a visor, the process steps will be less than the vacuum thermal evaporation technology, so the inkjet technology is expected to greatly increase the yield.

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