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Optoelectronics/Displays??

Samsung touts improved display technology for mobiles

Posted: 25 Mar 2005 ?? ?Print Version ?Bookmark and Share

Keywords:displays? mobile display mode? lcd? transflective? transmissive?

Samsung Electronics has started applying its proprietary PVA technology to improve the viewing angle of displays used in devices 10-inches or smaller.

The PVA technology has till now only been been used to improve off-axis viewing characteristics for large-sized LCDs. Now, when combined with a transflective mobile display mode, the so called Mobile Super Wide View+ (mSWV+) is being offered as an ideal design for rotational mobile multimedia displays.

Samsung plans to start mass production of the novel transflective mSWV+ technology for high-end handsets in 2006. The company says that in time, the displays could be used in medium sized audio-video products or car navigation systems as well.

The 10-inch or smaller displays allow viewing of ultra-sharp LCD images at a 160-degree viewing angle in a variety of low or high ambient lighting conditions, says Samsung.

Conventional transmissive LCDs are difficult to view in high ambient light conditions, even with a backlight. The company says the latest high contrast, low-power, wide-angle mobile display that can be viewed with backlighting for indoor applications, or without a backlight by reflecting natural sunlight in outdoor environments.

Small and medium-sized transmissive LCDs generally have a low contrast ratio of 250:1 with a viewing angle of only 80-degrees up and down and 100-degrees left and right. The combination of transflective mode LCD and the mSWV+ technologies increase the contrast ratio by 60 percent to 400:1 with no gray scale inversion.

Samsung adds screen colors remain unchanged as the display moves throughout a 160-degree bi-axial direction.

Jin-Hyuk Yun, senior vice president of the Mobile Display Business Team, said: "Our challenge was to develop a transflective mobile display with enhanced optical and electrical advantages. This development reaffirms Samsung's commitment to the advancement of mobile display technology, while underscoring the many ways in which our PVA viewing enhancements can be applied."

In the Patterned-ITO Vertical Alignment (PVA) technology, off-axis image quality is enhanced since the liquid crystal molecules are originally aligned at 90-degrees vertically to the ITO electrodes, and an electric field is passed through the electrodes to deflect the liquid crystal molecules off-vertical and produce the required image.

As with current vertical alignment technology, it uses a 4-domain liquid crystal cell structure.

- John Walko

EE Times





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