Technology:

Organic Light Emitting Diode (OLED) technology emerges as challenger to Active Matrix Liquid Crystal Display (LCD). Our company focuses on exploiting OLED technology not for competing with LCD but to enable small area LCDs enhance their screen quality in terms of super brightness and high color quality. Our product is OLED backlight for LCD used in cell phone and digital cameras. Cell phone hand-sets will become thinner with our OLED backlight.

Our technology is based on ‘small molecule OLED’ and will outperform LED backlights currently being employed in cell phones and digital cameras. The assembly using our OLED backlight will be simpler because of our light source being intrinsically flat compared to LED bulbs. The brightness will be uniform over the entire area of screen with our OLED backlight. White spectrum emitted by our OLED backlight is superior to the white spectrum emitted by white LEDs and thus provides a superior color quality of pictures seen on cell phone screen and digital camera screen.

Our first generation of OLED backlight is based on thin glass substrates which makes the cell phone hand-sets thinner. Our second generation will be based on flexible substrates which are four times thinner than glass substrates and reduce the weight of the cell phone hand-sets in addition to the thickness. This will be a huge advantage to cell phone hand-set assemblers as well as end-users.

Our technology employs multi-layer organic thin films based on ‘small molecule’ as the core of the device for light emission. A cross-section of our device of first generation and second generation is shown in the following Figures 1 and 2.


Fig. 1: First Generation OLED backlight


Fig. 2: Second Generation OLED backlight

An exploded view of our OLED backlight is compared with the current LED backlight in cell phones as shown in Figure 3.


Fig. 3: Simplicity of OLED backlight

The advantage in terms of simplicity in assembly and compactness is clear from the Figure3. Assembly is further simplified because our OLED backlight is a single flat light source unlike LEDs which are four in number per backlight assembly and require brightness selection process (‘binning’) due to their non-identical individual nature. In our OLED backlight no such ‘binning’ is necessary.

The spectrum emitted by our white OLED backlight is compared in Figure 5 and 6 with white LED.
 

Fig. 5: White LED Spectrum

Fig. 6: White OLED Spectrum

It is clear that our white OLED backlight has a rich red and green spectrum and thus provides superior color quality to cell phone screen and digital cameras. The advantages of our white OLED backlight of 1.5” diagonal over conventional white LED backlight, for application to cell phone handset, are shown in Table I.