Micro-Lens Array (MLA) - Page 3

Researchers from the University of Michigan developed a new method to cost-effectively extra more light out of OLED displays. To achieve that, the researchers used a Sub-Electrode Micro-Lens Array (SEMLA) placed between the bottom transparent ITO electrode and the glass substrate. Testing on green and white PHOLEDs, the researchers say the SEMLA enhanced light output by a factor of 2.8 (green) and 3.1 (white) compared to a similar device without the lens array.

The researcher say that such an array can be fully transparent and has no impact on the sharpness of the display. The hexagonal array of 10 um lenses can be fabricated using conventional photolithography methods which are quite cost effective. Such a micro-lens array does not change the actual OLED production process.

In January 2017 Kopin unveiled its first OLED microdisplay, the 1-inch 120 Hz 2k x 2k Lightning panel, and in March 2017 Kopin announced that it is developing a VR headset in collaboration with Goertek - a mobile VR headset that uses the Lightning OLED microdisplay.

The two companies now unveiled their VR headset reference design, called the Elf VR. The Elf VR utilizes Kopin's Lightning OLED microdisplay to create a headset that is lighter, more efficient and with a higher image quality compared to the current VR headsets based on smartphone-sized OLEDs. The Elf VR adopts an advanced optical solution with a compact Multi-Lens design. The reference design supports two novel optics solutions 70 degrees FOV for film-like beauty or 100 degrees FOV for deep immersion.

Novaled announced that it has developed a new efficient (36 lm/W) fluorescent white OLED, which the company claims is the world's most power efficient white OLED structure. Novaled used their own proprietary organic materials and a new flat light outcoupling method of extraction and achieved an increase in light emission by more than 80%, with good color rendering. Novaled's new structure also has an improved light angular dependence.

Here's more technical info from Novaled's press release: