On display at a tradeshow this week are several innovative screens developed by Toshiba Matsushita Display Technology Co. (TMD).
The most interesting of these is a prototype of the world’s first “system on glass” input display. This screen not only acts as a 3.5-inch QVGA active-matrix color display, it can also capture images, such as color photos or printed text.
This unique device utilizes low temperature polysilicon (LTPS) technology, which allows for patterning of additional IC circuits directly onto the glass substrate. The input capture function is achieved through photo sensor devices embedded in the LCD.
Handheld-Size OLED Screen
TMD is also showing off a prototype 3.46-inch QVGA OLED display. OLED (organic light-emitting diode) displays take advantage of the fact that some organic compounds glow when an electrical current is applied to them. This means there is no need of a backlight, as the individual pixels provide their own light. This allows OLED screens to be thinner and lighter than standard LEDs. Colors also tend to be more vivid.
Many have predicted that OLED displays will replace traditional LCDs in handhelds and smartphones in the coming years. One of the factors slowing this down is that companies have had difficulties manufacturing active matrix OLEDs in sizes large enough to be used in a handheld.
Small Screens for Smartphones
TMD is also showing off its line of 2.0-inch, 2.2-inch, and 2.4-inch displays. Despite their small size, these feature 240-by-320-pixel resolution.
They use the company’s “Visible Everywhere” transmissive display technology which includes a reflective film, allowing them to offer the brightness and color fidelity of transmissive-type displays while ensuring vivid image performance both indoors or outside.
“The QVGA display lets cellphone makers provide more and more image content on the small screens, and provides for better photographic image quality, too,” said Steve Vrablik, director of business development for LCDs at Toshiba America Electronic Components, Inc.
Screen for Mini-PC
TMD has also developed a 5.6-inch WSVGA LCD, which offers a resolution of 1024 by 600 pixels in a small, lightweight form factor targeted for mini-PCs, like the OQO uPC and Vulcan’s FlipStart.
The screen features a pixel density of 211 pixels per inch (ppi) to provide HDTV-quality images, which was achieved through the use of advanced polysilicon TFT LCD technology.
About Toshiba Matsushita Display Technology Co.
TMD is the joint venture formed from the merger of Toshiba’s and Matsushita’s display panel businesses. TMD, 60 percent owned by Toshiba and 40 percent by Matsushita, is a leader in display devices, LCDs, and Organic light emitting diode displays.
These new products are being demonstrated at the 2004 Society for Information Display International Symposium, Seminar, and Exhibition, going on now in Seattle.