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September 14, 2004
New Thin Screens for Mobile Devices Realize CRT-Quality Picture Clarity and Color Gamut
This month, Sony Corporation will commence mass production of a full-color Organic Light Emitting Diode (hereafter OLED) display, which will be first implemented in the new Sony CLIE 'PEG-VZ90' personal entertainment handheld (also announced today for the Japanese market).
OLED display is a self-luminous display that does not require a back-light, offering high contrast ratio, a quick response time and wide viewing angle-all in a package slimmer than current LCD modules. To enhance this display, Sony has employed its unique Super Top Emission technology for outstanding brightness and greater color gamut. These translate into image quality and clarity that could previously viewed only on CRT (cathode ray tube) displays.
The new 3.8-inch (or 9.7 cm) screen measures 2.14 mm thin, and makes it possible for users to enjoy a variety of high-quality content such as TV programs and digital still images on mobiles products such as the new CLIE VZ90 handheld without compromising on the viewing experience.
As the name implies, Super Top Emission leads light emission from the upper side of the organic material, realizing a brightness level of 150cd per square meter. Also, by optimizing the thickness of the organic layer for each of the color components, RGB, Sony realized multi-interference of reflecting light. Additionally, with the cavity multi-reflection interference structure which enables emission of colors with high purity, bright and brilliant color gamut comparable to that of CRT is realized
Bottom Emission StructureSuper Top Emission Structure
As OLED works with self-luminous organic materials, it has outstanding response time, without producing any afterimage even when displaying moving images (movies). Also with wide viewing angle and contrast ratio as high as 1000:1, high quality images can be realized on mobile products which are used in various occasions.
| Sony's OLED display | Reference : Sony's equal level LCD display (transmissive / reflective combined type) |
|
|---|---|---|
| Display Size | 9.7cm (3.8-inch) | (same) |
| Number of Dots | 480xRGBx320 (HVGA) | (same) |
| Dot Pitch | 480xRGBx320 (HVGA) | (same) |
| Number of colors | 262,144colors | (same) |
| Brightness | 150cd per square meter | 55cd per square meter |
| External Dimensions | 94.7mm(horizontal)×77.2mm(vertical)×2.14mm(thickness) (thickness including the panel only and not including the protruding portions) |
65.0mm(horizontal)×96.5mm(vertical)×3.49mm(thickness) (thickness includes the panel + backlight) |
| Response Time(at 25°C, ON) | ∼ 0.01 Mil. sec. | ∼ 16 Mil. sec. |
| Color Gamut(NTSC* Ratio) | Approx. 100% | Approx. 40% |
| Viewing Angle | Vertical: Approx. 180 degrees Horizontal:Approx.180degrees |
Vertical: Approx. 130degrees Horizontal: Approx. 125 degrees |
| Contrast Ratio (in darkness) |
Approx. 1000 : 1 | pprox. 100 : 1 |
