The World Smallest OLED Microdisplay Projection Device Design Methodology

Abstract

We developed the world smallest OLED microdisplay projection device. This device consists of just 2 parts which a high-brightness Microdisplay based Organic Light Emitting diodes on a silicon backplane panel (M-OLED) ( 1,000,000 [cd/m2] ) and an optimal lens (F/1.1) for the self-emitting projection device. This high- brightness M-OLED is used 2 key technologies. The first is a supplying the photoexitation potential to multiple emitting layers in OLED using by the new pixel transistor (Tr.) that can withstand very high voltage in 7.8 pm pixel. The second is the controlling light divergence angle from each self-emitting pixel that made using micro optical resonance effect from cathode until anode electrode in OLED and the optimized micro lens (ML) for each pixel. Next, we evaluated the relationship between the light divergence angle from M-OLED and F number (Fno.) of the projection lens and we found parameters and a specific method for controlling the light efficiency of the self-emitting projection device. Based on the results of these fundamental studies, we established a design methodology for the self-emitting projection device with high efficiency, and we realized the world smallest self-emitting projection device (W 10 /D 11 /H 6 (mm)).