LG Display Co Ltd and Samsung Mobile Display Co Ltd exhibited see-through displays at FPD International 2009, which takes place from Oct 28 to 30, 2009, at Pacifico Yokohama, Yokohama City, Japan.
Both of the displays use organic EL materials. The part where normal OLED displays would show black color is transparent, and the background can be seen though the displays.
Normally, OLED displays are designed so that organic EL light exits either from the side of positive electrode or from the side of negative electrode. The new displays use transparent materials for both the positive and negative electrodes, and organic EL light exits from the both sides. In addition, the displays are sealed with a transparent material.
LG Display demonstrated a 15-inch transparent OLED display, which is aimed at use in public places. The transmittance of the display, which is the first sample, is 30%. The company has not yet decided when to commercialize it.
Samsung Mobile Display showcased a 2-inch transparent OLED display. At the exhibition site, a mirror is placed behind the display to show that the back side of the display also shows an image.
The pixel count and resolution of the Samsung's display are 176 x 220 (QCIF) and 141ppi, respectively. The luminance is 300cd/m2 for the top emission and 100cd/m2 for the bottom emission. The transmittance of the display is 30%.