Give full play to the characteristics of OLED lighting
What attracts attention is not the products that follow the style of the previous lighting fixtures, but the panels and appliances that fully utilize the characteristics of OLED lighting. The characteristics of OLED lighting include (1) light source for surface illumination, (2) thin and lightweight, (3) flexible, (4) transparent, and the like. Previously, development has focused on ensuring the minimum brightness required for lighting and improving luminous efficiency. Recently, the development of features (1) to (4) has begun to rise (Figure 1).
For example, Mitsubishi Electric Lighting has demonstrated a product that has a light-emitting panel in the glass that does not directly see the light source from the outside. Take advantage of the features of OLED lighting (1) and (2).
Konica Minolta exhibited a "light feather" that uses two light-emitting panels made of a resin substrate to flap the wings like a bird. This is a trial production example that utilizes the characteristics of (2) and (3). According to the company's introduction, "the weight can only be bent like paper when it is made of 1/10 of the glass substrate."
"Glowing windows" become reality
NEC Lighting and Toshiba have developed a light-emitting panel and an appliance that utilizes (4) a transparent shape (Fig. 2). NEC Lighting has developed the largest 20cm view panel in the transmissive OLED, and this time the "lighting window" using the panel was exhibited.
Toshiba and Toshiba lighting technologies have developed transmissive OLED panels using proprietary technology. The back electrode of the conventional transmission type OLED uses a transparent electrode instead of aluminum. However, there is a problem that a large amount of light leakage occurs on the back surface of the light-emitting panel When used in windows, etc., not only indoors but also outdoors, it may cause power waste and light pollution.
Toshiba and others have developed the technology that "most of the light shines on the front of the panel, and only one-tenth of the back leaks" (the company's commentator).
Hitachi is involved in OLED lighting business with its own technology
In addition, there are also large manufacturers of "new involvement" in the OLED lighting business. That is Hitachi. The company's self-developed coating process demonstrated not only achieved a high luminous efficiency of 70 lm/W, but also reduced manufacturing costs. In general, a white light-emitting panel needs to form different light-emitting layers for red (R), green (G), and blue (B), respectively. However, the problem at this time is that the underlying layer is damaged when the upper layer is applied.
The technology of Hitachi, Ltd. only needs to be applied once to form three layers of RGB, so there is no such problem (Fig. 3).
Technology to promote the popularity of OLED lighting has also made progress. Panasonic Illuminated OLED Lighting (PIOL) and DN LIGHTING (DNL) have developed lighting fixtures that separate the light source section and the base section of the OLED light-emitting panel, thereby easily replacing the light source section (Fig. 4).
According to PIOL, "the luminescence lifetime is about 10,000 hours, and it is a little short, so it is very important to replace the light source."
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