Display technology for mobile phones – dot matrix OLED

The rapid development of displays is hard to miss: even offices and homes with bulky CRT monitors were equipped, some time ago so the flat screen is announced today. The Exchange was rewarded by significantly better picture, less consumption of space and less power consumption. But also and especially with the phones a lot has teamed, despite its relatively short history.

Not only TVs and computer monitors made a rapid development in the area of the display, but also the phones. First find this more widespread since the mid-90s, this development is all the more surprising.

So it started

All with inconspicuous, clunky devices that had to do with monochrome display, which only had a very low resolution started. At this time, mobile phones were but still not very far already a status symbol spread, but despite their missing grace. It was interesting but only with the further developed variants of these displays that were suitable due to the higher number of pixels been well for small games.

So it came that late 90s to early 2000 the game looking for Nokia phones woke up the snake game, many young people (right to see). This shall be credited and the development of mobile phone displays. Until then, however, most phones with monochrome displays were equipped. The backlight has however varied from manufacturer to manufacturer: here there was above all, green and orange.

Revolution: mobile phones with color display

Developing a while before brought also the television behind them, should seek also the phones. With the Sony Ericsson T68 was the first mobile phone with a color display in the stores. At that time at horrendous prices – who wanted to be progressive, had also at that time already reach deep into the Pocket. So the price for such a device without a contract amounted to about $800.
The color appearance of the device was not comparable at this time with the today’s devices: only 256 colors, the T68 could represent, but very blurry and washed out – at least from today’s perspective. But many with a color display followed on this phone. The foundation stone was laid.
Very amusing: I’ve found yet a review of this phone from 2001, which the author already knows how the phone displays; develop It says: “ color displays are still a rarity on cell phones, though I strongly suspect we’ll be seeing a lot more of them in the future. ”

the development of the TFTs

while the first phones with monochrome presentation on so-called dot-matrix based display, another innovation came up from 2003. Here came the TFT so the display technology, which is still used today in the most PC and laptop screens find technology,.

At wikipedia you can read technical details about the TFT (or even LCD) technology, here a snippet:

Is a liquid crystal display or a liquid crystal display (English liquid crystal display, LCD), a screen or a display (English display), the functioning is based on liquid crystals affect the polarization direction of light, if a certain amount is applied to electric voltage.

That benefits of TFTs compared to dot matrix displays are clearly obvious. Here, the appearance of more colors and higher resolutions is possible. A disadvantage which is not so much at that time quite manageable size of displays, is the increased power consumption compared to the old technology.

The bigger the better

Especially for mobile phones is unmistakably the evolution of towards ever larger displays. There were still more practical, small displays, years ago there are large displays, where you partly already times well can watch a movie.

Current extreme example is E.g. the Toshiba TG01 with a 4.1 ″ large display is equipped. As already indicated in the report on the Toshiba Smartphone, the small battery above all coped with the large display not (and the fast processor).

At such large displays, TFT technology is so limited by the battery.

Displays in the control

There are touch screens long, but with simple phones, the iPhone 2 G has achieved a breakthrough for the broad mass of the population here. Because who wants to already permanently assigned when a normal cell phone on a PIN be, to use the control?

Again is responsible above all display technology for the popularity of smartphones.

Thanks to the touch-sensitive display that works even with two fingers at the same time (so-called “ multitouch ”), the operation is intuitive. The special feature of the iPhone is a sensitive layer above the actual display, which empfindlichst responds to electrical stimuli. This operation in terms of touch screen leading the way and once again a revolution that is based solely on new display technology is.

TFT is replaced by OLED (AMOLED)

As noted earlier, the phone displays become larger and larger. Accordingly, the power consumption is growing – unfortunately not proportional to the development of batteries, so that large TFT displays mostly in low battery life results.

But a new display technology is in the onslaught: the organic light-emitting diode, short OLED. Although the revolution does not at first glance is shown as the difference between CRT and flat screen TV, but a lot of new features here is in the details!

The low power consumption is

especially interesting about OLED screens. Here can be saved compared to LCD clear screens, so hard to run out of steam is phones that are equipped with OLED. Also the contrast and the brightness of the screen compared to TFT significantly better; as the angle of view. Particularly impressive, you can see the difference in the Samsung Omnia HD I8910 – you have the phone in your hand, one is initially overwhelmed by the brilliance of color.
Samsung is the producer who is particularly involved in this area at the moment, by the way, to promote the new display technology and distributes the OLEDs even under its own name, namely AMOLED.

Here some information about OLED (read Wikipedia):

An organic light-emitting diode, OLED short (short form for engl.: “organic light emitting diode”), is a thin film-shining component of organic semiconducting materials, that differs from the inorganic light-emitting diodes (LED) as a result, that current density and luminance are low and no single-crystalline materials are required. Compared to conventional (inorganic) light-emitting diodes, organic light-emitting diodes can be therefore more cost effective to connect, but still less than the one of conventional light-emitting diodes is their life.

Samsung Omnia HD I8910 in action