Kopin Corporation (KOPN)

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Kopin’s color display is made with a duo-stack white OLED structure and color filters. Kopin has been working with its partner, Lakeside Optoelectronic Technology Co., Ltd., to optimize the duo-stack OLED structure to output color spectrum to match the bandpass of the color filters for high color fidelity, coupled with very high Current Efficiency and low operating voltage. These 720p displays fabricated from multiple wafers exhibited average Current Efficiency of about 12 candela per ampere (cd/A), with the maximum value about 14 cd/A. These values are much higher than the best publicly available values of the alternative approaches. Kopin’s best 720p display exhibited 7,000 nits with a contrast ratio of >4000: 1. The contrast ratio of the display at 5000 nits is higher than 100,000:1. The power consumption of the display, including the backplane power, is about 500 mW when displaying a full white image at 7000 nits. The 720p display’s color fidelity is about 100% sRGB.

“We are extremely excited that our OLED micro display has achieved the very high brightness with good color fidelity by using the duo-stack OLED structure and ColorMax technology. This is truly a shocking achievement,” said Dr. John C.C. Fan, President and CEO of Kopin Corporation. “This breakthrough high Current Efficiency is very important for low power consumption and longer lifetime for OLED micro displays. We now expect the Current Efficiency could be optimized even further which means that our present value of 7,000 nits may be increased further. In addition, the duo-stack OLED structure and ColorMax technology are manufacturable as we have obtained such great results from multiple production ColorMax wafers in Lakeside’s OLED production line. We believe by incorporating another innovative structure on our micro display such as a microlens array to enhance the output coupling efficiency, the brightness can be significantly increased further, opening many applications for the OLED micro displays, especially for the AR/VR wearables.”