[Toyo Technica] Develops inspection technology to examine the behavior of organic EL devices at ultra-low brightness
*Toyo Technica*
Press release: September 10, 2024
**
Developing inspection technology to examine the behavior of organic EL devices at ultra-low brightness
*Commercialized by US subsidiary TOYOTech, scheduled to start selling worldwide in October*
Toyo Technica Co., Ltd. (Headquarters: Chuo-ku, Tokyo, Representative Director and President: Toshiya Kono, hereinafter referred to as Toyo Technica Co., Ltd.)
TOYO Technica) is a US subsidiary of TOYO Technica, TOYOTech LLC (Headquarters: California, USA; hereinafter referred to as
TOYOTechnica).
Sharp Display Technology Co., Ltd. (Headquarters: Kameyama City, Mie Prefecture, Representative Director and President: Kawai)
(Katsuhiro Katsuhiro), Japan Advanced Institute of Science and Technology (National University Corporation) (Location: Nomi City, Ishikawa Prefecture, President: Terano)
We would like to announce that we have developed an inspection technology to examine the behavior of organic EL devices at ultra-low brightness in collaboration with (Moshi).
This technology focuses on the fact that the difference between the voltage at which current suddenly begins to flow through an organic EL element and the voltage at which it starts emitting light increases as the element deteriorates, and quantifies this difference, which is required for longer life. It is expected that this method will be useful in analyzing display unevenness that occurs in organic EL devices due to deterioration or low brightness. This technology was discussed at the International Conference on Displays held in South Korea in August.
A joint presentation was made by the three parties at the Meeting on Information Display.
On October 1, 2024, TOYOTech will begin selling the “DCM1000 DC-JVL Measurement System” to the United States, Asia including Japan, and Europe.
* [Background/Summary]*
Organic EL (*1) devices are formed by stacking multiple layers of thin films several tens of nanometers in size, and their characteristics are evaluated in order to optimize the deposition conditions for these thin films. This characteristic evaluation is generally performed by simultaneously measuring the current flowing through the element and the luminance (*2) while applying a voltage called J-V-L (current density-voltage-luminance) characteristics. However, with the J-V-L characteristics, it was not possible to measure the minute current and low brightness when the device starts emitting light due to the sensitivity limit of the device.
The newly developed technology simultaneously measures the minute current (displacement current) flowing through the organic EL element and the emission intensity from a highly sensitive silicon photodiode, and detects the difference between the voltage at which a sudden current change occurs and the emission start voltage. and perform the analysis. In addition, it is possible to consistently measure current and luminous intensity not only at ultra-low brightness but also at high brightness while constantly optimizing the range. It can be used to analyze display unevenness that occurs due to deterioration of organic EL elements, and contributes to further improving the performance of organic EL elements.
・Product page: https://toyotechus.com/lab-dcm1000/
*1
A light-emitting phenomenon that occurs when voltage is applied to an organic compound (organic EL element). By utilizing this phenomenon, it is possible to create displays that are thin, lightweight, and consume little power, and are increasingly being used in TVs, smartphones, and other devices. Because the organic EL element itself generates color by emitting light, the structure is simpler than that of a liquid crystal display.
*2 The degree of brightness of light emitted from an organic EL element. The unit is cd/m2 (candela per square meter).
* -About TOYOTech LLC-*
TOYOTech is a local subsidiary of Toyo Technica, which was established in Fremont, California, USA in 2015. We provide our own products, which TOYO Technica has developed by combining the measurement know-how and technical capabilities we have accumulated over many years, as well as unique products developed at TOYOTech, to customers around the world, mainly in the United States. We mainly provide evaluation testing and measurement solutions for automobiles, new materials, information communications, and EMC fields.
Additionally, in Silicon Valley, one of the meccas of innovation, we collect cutting-edge technology and information, and also play a role in collaborating with startup companies and proactively promoting M&A. * TOYOTech LLC Website: http://www.toyotechus.com