OLED micro-displays for the next generation of smart glasses
The technology sector has a constant tendency to outbid larger screens with better resolution. The fact that the second factor is growing faster than the first means those manufacturers has to obtain an ever-higher pixel density. The large OLED micro-displays developed as part of the LOMID project could help to solve this problem, thereby providing Europe with a competitive advantage. They considered a must for applications close to the eye. Such as virtual reality glasses over the next few years. OLED micro-displays should play a major role in a market estimated at 7 billion.
Order to demonstrate their advantages in commercial applications the industry will have to be able to produce very flexible micro-displays. Measuring 13 x 21 mm, the project’s curved micro screens have a resolution of 1,920 x 1,200 (WUXGA) and exceed 2,000 ppi. They have already manufactured with satisfactory performance. The consortium continues to improve these returns in order to be competitive in markets where price is as important as performance. The Technology demonstrated in smart glasses for both virtual reality and the visually impaired.
What makes LOMID micro displays so innovative?
LOMID’s screens are bigger 1 and have a much higher resolution (WUXGA) than anything that was available on the market until very recently. We have gone to great lengths to ensure a high contrast. A wide bandwidth frame rate this last element is very important for eliminating motion artifacts and making virtual reality both immersive and comfortable. The OLED display of course has high brightness and excellent rendering colors. A novelty of the project is the ability to manufacture curved OLED screens. We believe that the use of curved screens will allow simpler and ultra- compact optical designs for near vision, as in the case of smart glasses.
Can you tell us more about the manufacturing process?
We prefer not to do it! What we can say is that the interface CMOS-OLED was a key challenge for the project. To ensure good performance and good performance of the device this interface must be extremely flat. As larger screens are inherently more, expensive of produce we have also focused on improving efficiencies at all stages of the manufacturing process. So that the final cost of the screen remains reasonable. What are the main difficulties you have encountered to create the LOMID chip? Apart from the CMOS-OLED interface, our biggest problem has been to reach the bandwidth required for the big chip, while preserving the compactness and low power consumption of the circuit.
Does the device meet your initial expectations?
At the end of September, the project produced the first chips that fully meet the specifications (with and without color filters). We are very satisfied with the performance of the screens obtained from the first patties.
What has been the reaction of the industry so far?
They have been very positive. At the beginning of the year, in Dresden we showed in particular some intermediate results of the project. The reactions obtained confirmed that the new micro-screens and our optical design innovative solutions meet the needs of the market.