Archive for May, 2007

Sony: first flexible colour OLED display

Friday, May 25th, 2007

CNET News is reporting on the world’s first truly flexible OLED display fabricated by Sony.

Sony flexible OLED display

According to Pink Tentacle

The 2.5-inch prototype display supports 16.8 million colors at a 120 x 160 pixel resolution (80 ppi, .318-mm pixel pitch), is 0.3 mm thick and weighs 1.5 grams without the driver.

The prototype, as well as technical details were presented at the SID conferernce. Apparently the display is driven by pentacene TFTs with a mobility of 0.1 cm2/Vs.

Each subpixel (red, green or blue)is driven by a two-transistor, one-capacitor PMOS voltage programming circuit. The display operates at a frame rate of 60 Hz with a signal voltage of 12 V.

Sony uses a top-emission structure for its OLED displays, meaning they have driving transistors on the bottom and emit light from a top OLED layer. […] The structure reportedly allowed the engineers to fabricate the electrodes before fabricating the organic TFT layer, without damaging the semiconductor layer.

The latter is achieved by depositing the pentacene on a patterned, negatively-sloped layer acting as a “built-in shadow mask”.

E Ink Vizplex: faster & brighter

Thursday, May 10th, 2007

E Ink announced the launch of a faster a brighter version of its electrophoretic display medium:

Previous Generation Imaging Film Vizplex Imaging Film
Typical Switch Speed 1200 ms 740 ms
Peak Switch Speed
(monochrome)
500 ms 260 ms
Brightness (typical reflectance) 32-35% 40%
Supported Grayscale Levels 4 levels (2-bit) 8 levels (3-bit)

Further:

E Ink and PrimeView International (PVI), the pioneer and currently the world’s sole active matrix EPD maker, jointly announced TFT modules built with Vizplex, in an expanded size range that includes 1.9″, 5″, 6″, 8″ and 9.7″ diagonal displays available this summer.
[…]
E Ink also announced the sampling availability of the MetronomeTM Display Controller, which adds new functions at a lower cost.
[…]
Active Matrix Prototype Kits
To accelerate customers’ evaluation and product development, E Ink will offer EPD prototyping kits in more sizes and with both Metronome and Apollo display controller options.

E Ink Vizplex schematic

Via Register Hardware.