Will OLED Technology Pave the Way to Micro Displays

Low power consumption continues to gain further growth momentum, especially in the mobile application market, such as music / video players, viewfinders for cameras and cameras, and consumer video glasses. At present, there are many micro display technologies competing in this market. (especially micro LCD technology) technology has matured through the increasingly popular large screen TV and monitor application market. Reflective display technology (including digital light source processing technology DLP and silicon-based liquid crystal technology LCOS) has special advantages for projection systems, and they have been realized in various popular applications over the years, and significant progress has been made. Radial display technology (such as OLED, i.e. organic LED) is relatively new, but it can compete with LCD and LCOS technology in price and performance. In addition, because they are relatively still in the early stage of development, they still have more room for improvement in the future.

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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Hello, will using LCD for a long time affect the notebook screen?   When using the LCD screen, pay special attention to its working time. When it works continuously at full load for more than 96 hours, it will age rapidly and even burn out in serious cases, resulting in huge economic losses to users. This is because the pixel points of the LCD screen are composed of liquid crystals. Working for a long time, it is easy to overheat some pixel dots. Once the limit is exceeded, it will cause permanent damage. This forms what is often called a "bad spot" (some media call it a "black spot"). Therefore, if the user has to work for a long time, the screen must be intermittently rested, and the same content cannot be displayed for a long time. When the screen is waiting to work, it is necessary to reduce the brightness. Using screen saver is a good habit. It can not only delay the aging of LCD screen and prolong its service life, but also avoid hardware damage.         If there is something wrong with my screen, can I take it apart?   For the LCD screen, because its structure is very delicate, no matter what problem occurs to the user's screen, do not disassemble the LCD screen by yourself. If you suspect that your LCD screen is not working properly, you should ask the manufacturer to send professional eyes to help solve the problem. The transformer in the LCD background lighting assembly may still carry 1000V high voltage (although it is micro current) after shutdown for a certain time. If non professionals do not handle it well, it may cause new faults of the assembly, and in serious cases, it may also cause the screen to permanently fail to work - this is an unwise move to lose money for small things.       Hello, how can I prevent the laptop screen from aging?   The lighting lamp in the LCD screen is the only natural consumption part. After a long time of use, it will age, resulting in the darkening of the screen and the decrease of brightness. If the screen darkens due to aging, you only need to replace the lighting lamp to bring the screen back to life and return to youth. Of course, the most important thing is to pay attention to maintenance at ordinary times. Prevention lies in the future. Based on the author's years of experience in screen maintenance, users can pay attention to some problems: for example, the brightness cannot be adjusted too high, and long-term high load work will accelerate the aging of the screen       Excuse me, do different flashing modes of LCD screen have different meanings?   Due to the influence of the analog signal output interface, for example, the clock and phase of the pixel are not synchronized with the analog signal output, which will lead to flicker. This phenomenon is usually called pixel jitter. It is an occasional flicker phenomenon, which is inevitable in the process of analog / digital conversion. In order to solve this kind of problem, there are two methods. It can be "automatically adjusted". There is a "automatic setting" function on the LCD screen, which is used to adjust the LCD screen to the best state after analyzing the input signal. It can also be "manually adjusted", which can be adjusted by two functions: phase and clockHello, the weather is very bad recently. It's wet all around. Does it have any impact on the laptop screen?   Dampness is the taboo of LCD screen. When using LCD screen, it must be placed in a ventilated and dry environment to avoid the invasion of water vapor. This is because the internal design of LCD screen is very precise. Once there is short circuit caused by oxidation and corrosion due to humidity, it will bring huge economic losses to users. If you accidentally wet the screen, don't panic and turn off the power first. If there is only moisture on the screen surface, wipe it gently with a soft cloth, and then turn on the power to work. If the moisture has entered the LCD screen, you must put the LCD in a well ventilated or warm place to let its moisture evaporate. If the situation is very serious, users should ask professionals to help solve it. Remember, first of all, turn off the power supply and do not let the LCD power on when the moisture is not removed, otherwise it will easily lead to the corrosion of the LCD electrode, and the best technicians will have no way to recover.
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