Micro-Lens Array (MLA) - Page 3

Tianma demonstrated a new AMOLED display panel at SID Displayweek, that sports a micro-lens array that helps to decrease power consumption by 10-15%.

The so-called MLP panel is 6.2" in size with a 876x2142 resolution (373 PPI) and a brightness of 420 nits. The pixel configuration is, interestingly, YYG - yellow and green sub-pixels, which means that this display uses color filters.

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.

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: