Toshiba Matsushita Display Technology Co., Ltd. (TMD) has developed a 20.8 inch low–temperature poly–silicon (LTPS) organic light–emitting diode (OLED) display panel to advance to the next generation of flat–screen TV sets and monitors.
The newly developed panel demonstrates the world's largest screen size for polymer–type OLED display panels using LTPS technology, accomplished through the use of newly developed techniques for uniform coating of organic electroluminescent materials and the optimized combination of electrodes and organic materials.
TMD has been concentrating its efforts towards the development of LTPS technology and OLED technology. Since the development of a 17 inch OLED panel in April 2002, which then was the world's largest screen size among OLED displays, TMD has been developing 2.0 inch, 2.2 inch, 2.5 inch, 2.8 inch, and 3.5 inch OLED panels ideally suited for cellular phones and compact mobile equipment and has been in mass production of 3.5 inch OLED panels.
An OLED panel reproduces images from light emitted by the fine organic electroluminescent film formed on the glass substrate, thus it can provide high–contrast, clear images with ultra–fast response time for moving picture performance. In addition, the OLED panel features an ultra–wide viewing angle, a thinner profile due to the eliminated backlighting system and other peripheral elements, and energy conservation offering eco–friendly advantages.
The new 20.8 inch OLED display has been developed based on LTPS technology, which TMD has been continually refining, and an electroluminescent coating process, which is advantageous for larger display screen sizes. The three (RGB) color–emitting layers use polymer organic electroluminescent materials, and an ink–jet type coating process is adopted for coating of each color. These have contributed to achieving a large screen size of 20.8 inch and would enable the expansion of potential applications of large size OLED panels, which have been conventionally limited to smaller size screens.
In addition to the adoption of a top emission structure, TMD is now managing light at the nanometer level in individual pixels to improve the efficiency of distributing light produced from the color–emitting layers. This has contributed to higher brightness and lower power consumption.
The newly developed panel was exhibited in TMD's booth at the 3rd International FPD Expo (Display 2007) at Tokyo Big Sight from April 11 through April 13, 2007.
Source: Toshiba Matsushita Display Technology, Japan
A portion of this work belongs to Japan's "Advanced Organic Device Project" which OITDA (Optoelectronic Industry and Technology Development Association) contracted with Japan's New Energy and Industrial Technology Development Organization (NEDO).
At the 2007 SID INTERNATIONAL SYMPOSIUM on May 25 2007, Long Beach California, Satoshi Okutani from Toshiba Matsushita Display Technology, Japan, presented a paper, "A 20.8 inch WXGA Full-Color AMOLED Display by Integrating a Scattering Reflector with Micro-Bumps."
Sony has demonstrated a larger display unit - at 40 inches, but this has been built by putting togehter four separate OLED panels, and was not a commercial product.
Source top image: Toshiba Matsushita Display Technology, Japan
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