AMOLED(Active Matrix/Organic Light Emitting Diode)

AMOLED(Active Matrix/Organic Light Emitting Diode) is an Active Matrix Organic Light Emitting two very respectable board. Compared with the traditional LCD panel, AMOLED a reaction speed, contrast higher, perspective wider etc. Characteristics.

introduction

Active matrix organic light emitting two very respectable board (AMOLED) called next-generation display technology, including samsung electronics, LG philips, attached importance to the new display technology.

Development status

Currently with LG philips except samsung electronics to develop large size AMOLED products as the main direction outside, samsung SDI, friendly of small and medium size etc are for development direction.

The factory has production only samsung SDI, size of 3 inches ~ 4 inches.

Recently sharp President slice mountain dry male asked for future development of OLED opinion, he said to 5 years may, the individual thinks he said in TV market may be true, but in small and medium size market, there's a good chance AMOLED TFT LCD within 2 years and coexist, if the future AMOLED yield can reach the same with TFT LCD TFT LCD replaced level, which is definitely will come soon.

Because AMOLED whether in quality, efficiency and cost, congenital performance than the TFT LCD advantage many. This also is many international companies though yield hard break, still don't abandon development AMOLED reasons. Currently ongoing investment development AMOLED manufacturers, besides has announced that product time-to-market of Sony, Toshiba, panasonic put (investment), and the Toshiba TMD another alone for product development panasonic, and claims from good sharp. August 2008 N85 NOKIA released in 2009, and in the first quarter of NOKIA listed N86 are adopted AMOLED.

In a display performance, AMOLED reaction speed, contrast higher, the perspective also wider, these are inherently more than TFT LCD AMOLED place, In addition AMOLED with the self-illumination feature, without using back panels, therefore can do much more than TFT frivolous, and electricity -saving; A more important characteristics, do not need to use the back plate AMOLED can save accounted for TFT LCD 3 ~ 4 into proportion of backlighting module cost.

AMOLED is indeed very attractive products, many international companies are like, even is the mobile phone market thehottest products iPhone, all of AMOLED interested, I believe in the yield ascension, iPhone will also consider after using AMOLED, especially AMOLED in province electricity features, very suitable for mobile phones, at present AMOLED TFT LCD panel power consumption is only about six into, future technology and could drop space.

Of course AMOLED biggest problem or in yield, with the current yield, AMOLED panel price higher than TFT LCD pays 50%, it is used in great quantities of customer's wishes, is definitely a threshold of strange crystal, and concerned, present also are still attune yield training period, he daren't large order.

Material structure

By understanding the AMOLED TFT LCD with the main properties of difference, we through technical level to analysis the main reason of difference where. Because AMOLED is a kind of OLED technology, we with OLED working principle for analysis.

OLED (OrganicLight - EmittingDisplay, organic light emitting displays) refers to organic semiconductor materials and light-emitting materials in electric driven by carriers, injection and composite lead to shine phenomenon. OLED luminous principle is with ITO transparent electrode and metal electrodes are regarded as the anode and cathode device, in certain voltage driver, electronic and cavities respectively from the anode and cathode is injected into the electronic and hole-transporting layer, electronic and cavities respectively through electronic and hole-transporting layer migrated to shine layer and layer meet, glow when excitons and formed luminous molecules, the latter after radiation relaxation stimulate a visible. Radiation light can be observed from ITO side, metal electrodes membrane also played the role of reflection.

TFT LCD side, we with TN LCD panel working principle represented was introduced. TN LCD module structure: to column type LCD served between among glass. This glass on the surface of the first plating has a transparent and conductive films (ITO) to as electrode with. In ITO glass plating surface match to agents, in order to make LCD down a specific and parallel to the surface of the glass of direction alignment. Use an electric field can make LCD rotation of principle, add in two electrode voltage will make LCD polarization direction after steering and electric field direction parallel. For liquid crystal refractive index with LCD direction and change, the result is a light after TN type LCD after the polarization sex will change. The switch to control available electric light light and shade. This will form pervious to light when for white, not pervious to black, characters can be displayed on the screen.

Obviously, two panel used different light source, OLED for their own shine and TN are used back light, both the imaging mechanism is completely different. Through comparing the discover not hard, OLED is lighter and thinner active luminous (don't need back light), no problem, high-definition perspective, high brightness, rapid response, low energy consumption, use temperature range, seismic capability is strong, low cost and can realize soft display characteristics, many of which characteristics are TFT LCD panel elusive.