Polymer organic LED is the first to produce a full on chip high resolution micro display

I think you can call it honey. Let's welcome this supposedly first and only polymer organic light emitting diode (POLED) micro display. This "eye screen" ME3204 is developed by MicroEmissive Displays (MED) in Scotland, which is a full-color, high-resolution micro display on a chip.

ME3204 provides extremely low power consumption and a high level of image quality (as far as contrast and pixel) are concerned. It does not require a backlight and does not require a driver chip. Due to the adoption of a new technology, the polarization phenomenon is not considered. Moreover, it does not require complex optical systems.

ME3204 in a compact diagonal length of 6 mm (0.24 inches) array, providing QVGA resolution (320 x 240 pixels), a total of. It also has a 4:3 amplitude ratio. About 80% of the duty factor (the ratio of the area of each pixel) eliminates the problem of confusing flicker and blurring in a moving color video image that is often encountered in other displays. 50 to 120 frames per second video frame is also possible.

The ME3204 size is only 14 x 10 mm and incorporates a flexible rubber cable of a 50 mm (Figure 1). It works by 2.5V power supply, the power consumption is 50mW - about 1/4 of the other competitive LCD micro display. This is equivalent to the theoretical life of a single alkaline AA battery for 30 hours.

Figure 1: small size, low power consumption, high quality sports video image is developed by the MicroEmissive Displays glasses screen - ME3204 P-OLED micro display features.

The product was identified as working between -20 degrees C to 60 DEG C. It will also be able to completely convert the widescreen QVGA (WQVGA) resolution to 16:9, which is MED's plan to be implemented in the future (see "Color P-OLEDs Up To 21-in. TVs"). Its current ratio is the standard ratio for TV video glasses currently on mobile and personal media players.

Tight integration

ME3204 integrated driver circuit and color filter (Figure 2). It also contains a serial two-wire RGB interface and a parallel video interface compatible with the BT.656 standard to form a digital signal path. In this way, the design engineer can focus on software design.

Figure 2:ME3204 P-OLED integrates a drive circuit, a color filter, a serial two-wire RGB interface, and a BT.656 compliant parallel video interface.

The digital signal path does not require an analog to digital converter (ADC), thus eliminating the loss of the dynamic range of the composite video signal generated by the analog to digital conversion. If the application requires it, it is only needed to amplify the optical system.

How to make?

ME3204 stacked P-OLED material on a silicon wafer with a patented structure. It is based on the design of wafer free machining. The manufacturing process begins with the availability of a smooth, mirror like, fully processed CMOS wafer that is offered by an Asian supplier. This layer acts as an active array driver after the substrate.

Then, a series of nanoscale coatings were deposited onto the wafer. One layer contains the P-OLED material, which emits white light when a small current passes through it. The cathode is then deposited into a thin, transparent metal layer.

Then, a protective inorganic thin film encapsulation coating is deposited on the entire structure to protect it from external elements.

The next step is to suppress the silicon wafer on a glass wafer that contains an image color filter that provides a RGB pixel element to form a color display after the white light filter. All of these steps are used in the production plant of MED company in Dresden, germany. The final step is to assemble and integrate flexible cables in a factory in asia.

P-OLED Roadmap

MED co-founder of the company's strategic market leader Ian Underwood believes that ME3204 can be connected with the penetration of thin film transistor (TFT) LCD and reflective (silicon) liquid crystal display (LCOS). He believes that for the elephant prime size, TFT LCD not like P-OLED well zoom, because in this case, the lower the total optical efficiency and lower duty ratio (less than 25%) the artificial pixel is more obvious.

In addition, for TFT LCD, only low levels of integration are possible because they require more support chips. Underwood also points out that the reflective LCOS unit will experience complex optical problems and the complexity of the system due to sequential color.

So where does the eye screen ME3204 go? Target areas include a head mounted display and an electronic viewfinder (Figure 3). In fact, there are a lot of "close eye" video image products, including digital cameras and night vision systems. The use of ME3204's video glasses and headphones for consumer applications includes viewing DVD and video clips through personal media players, handheld electronic games, watching TV or surfing the Internet via mobile phones, etc..

Figure 3: medical workers can use a color, motion video P-OLED micro monitor to observe the operation process, for example, through the head wearing glasses device.

Now the mobile video broadcasting, video, and micro display and the development of optical integration means technology and applications have been coordinated in many consumer video eyewear products of important market opportunities will eventually come, Insight Media founder Chris Chinnock said. Insight Media is focused on the monitor