Will OLED Technology Pave the Way to Micro Displays
OLED displays can use small organic molecules or polymers. From the perspective of the whole display market, soluble light-emitting polymers have major advantages because they can easily precipitate into the solution on the display substrate without a temperature controlled vacuum environment (such as rotary coating or inkjet printing). Compared with small molecular OLEDs, polymer technology allows the manufacture of larger screen size displays because it does not require the masking mask required for vacuum deposition processing. Polymer OLED (p-oled) displays can also operate at lower voltages and consume less power than small molecule based displays.
P-only achieved real development in the early 1990s. At that time, Cambridge display technology (CDT), a British based start-up company, developed light-emitting polymer independently from Cambridge University. It is a fluorescent material located in the center of p-oled display.
Today, p-oled technology can be used to manufacture displays of various sizes and performance, from simple monochrome displays to full-color graphic displays that can display dynamic video. According to nanomarkets LC, a leading industry research company, organic electronic technology is rapidly going out of the laboratory and into practical application. For example, the market of OLED, organic thin film transistor and other display products made of organic materials will increase significantly from US $1.4 billion in 2007 to US $19.7 billion in 2012, and continue to achieve US $34.4 billion in revenue in 2014. By 2012, the OLED industry (including displays, signs and lighting applications) market is expected to grow to $10.8 billion.
Micro displays, which are integrated on a silicon substrate with drivers and control electronic circuits, are developing strongly. Micro display applications are divided into two categories: projection and near eye. P-oled micro display provides the greatest advantage, and the near eye micro display can be divided into two main subcategories. In the first subclass, the micro display module is embedded in the product and then held in front of the eyes by hand, such as the electronic viewfinder for video cameras and digital cameras, and the electronic viewfinder for some special systems (such as night vision goggles, electronic binoculars and telescopes). In another subclass, the micro display module adopts a hands-free structure placed in front of the eyes or worn on the head like a pair of video glasses (such as the head mounted display of personal multimedia player), which makes it possible to watch TV and play games on the road through mobile phone.
The latest representative work of p-oled micro display for the above applications is eyescreen me3204 developed by micro emissive displays (MED) Company in Edinburgh, UK. It provides a complete digital micro display solution and high degree of electronic and optical integration. Me3204 provides first-class image quality and ultra-low power consumption. It provides outstanding qvga resolution (320) 240, 230K pixels), and the spacing of diagonal pixel array is only 0.24 inch (6mm).
The radiation polymer organic light emitting diode (p-oled) technology without backlight elements, as well as the display driving electronic circuit and digital video interface integrated on me3204, allow me3204 to be directly and seamlessly integrated into many systems, and enable product designers to develop smaller and lighter products. Eyescreen me3204 is supplied with an integrated wire set.
low power consumption
The key elements of micro display are power consumption, image quality and service life. Power consumption is a problem. It has a greater impact on video glasses than viewfinder, because viewfinder is only one of the active components of handheld devices, and in video glasses, micro display is basically the main active component.
In digital cameras, LCD display devices are probably the most expensive single component. This is why it is often recommended to turn off the LCD display to save battery life. For example, a typical 320 A 240 pixel LCD display may consume 300 or 400MW of power, while a typical LCD micro display consumes less than 200MW. However, an equivalent p-oled micro display only consumes 50MW power. Therefore, using a p-oled EVF to replace an LCD display or LCD micro display is equivalent to a very significant improvement in battery life.
One reason for this phenomenon should be traced back to the basic characteristics of display technology. LCDs need a very bright backlight because they are transmissive and inefficient. In contrast, p-oled itself emits light and is very efficient.
Power consumption is a very big problem in video glasses. Here, the micro display is the single component with the largest power consumption. The power consumption of 50MW is equivalent to the theoretical 30 hour battery life of an alkaline AA battery. An LCD micro display lasts less than 9 hours.
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