http://www.digitaljournal.com/tech-and-science/technology/world-s-smallest-pixel-pitch-oled/article/526407

World's smallest pixel pitch OLED

Posted Jul 6, 2018 by Tim Sandle
A new OLED microdisplay features the world's smallest pixel pitch. The new image device comes from Sony. The new display is set to go int production later this year.
File photo: Panasonic s 4K curved OLED televisions are displayed at the Panasonic booth  at the Inte...
File photo: Panasonic's 4K curved OLED televisions are displayed at the Panasonic booth, at the International CES at the Las Vegas Convention Center, in Nevada, on January 7, 2014
David Becker, Getty/AFP/File
OLED technology is growing in popularity. This due to the plastic, organic layers of an OLED being thinner, lighter and more flexible compared with the crystalline layers found with LED or LCD displays.
The new product from Sony Semiconductor Solutions is a 0.5-type OLED microdisplay, which provides a UXGA (Ultra Extended Graphics Array) resolution (of 1600x1200 pixels). UXGA is on the monitor resolution scale, far superior to VGA or SVGA (it has four times the default resolution of SVGA).
In addition the display, EE News reports, features what is said to be the world's smallest pixel pitch at 6.3μm (which translates to a 4031 PPI, or pixels per inch, resolution).
The main application of the high-definition OLED Microdisplay will be used with augmented reality and virtual reality head-mounted displays. The product has functionality that is optimized for transistor layout processes, designed to tackle uneven characteristics. In addition, the display can effectively deal with issues associated with transistor miniaturization, which have hampered the development of such displays in the past.
In developing the array, Sony positioned the color filter directly onto a silicon substrate. This has the effect of reducing the distance from the light emitting layer. This assists with securing the viewing angle properties while maintaining a high resolution.