OLED microdisplay features world's smallest pixel pitch

July 04, 2018 //By Julien Happich
OLED microdisplay features world's smallest pixel pitch
Sony Semiconductor Solutions has announced a 0.5-type OLED microdisplay at an impressive UXGA resolution (1600x1200 pixels), claimed to feature the world's smallest pixel pitch at 6.3μm (which translates to a 4031PPI resolution.


Comparing the UXGA OLED microdisplay (left) with
the QVGA OLED microdisplay (right).

Sony expects this high-definition OLED Microdisplay to be employed in a diverse range of fields and applications such as AR (augmented reality) and VR (virtual reality) head-mounted displays. At 200cd/m 2, the device draws 310mW at 60fps (progressive) / 120 fps (dual-line progressive). Maximum luminance is 1,000cd/m 2.

The ECX339A OLED microdisplay delivers a resolution 1.6x higher than its predecessor while employing a new drive circuit design that operates on half the voltage of the previous part. When paired with Sony's original "Dual-line progressive" driving technique, the display supports a frame rate up to 240 fps, double that of the ECX337A, a 0.5-type QVGA (1280x960) OLED microdisplay.

The new product features optimized transistors layout and process to address uneven characteristics and loss of withstand voltage, the issues associated with transistor miniaturization.


The new product (UXGA, left) designed for a larger
viewing angle even at a smaller pixel pitch compared
to the previous product (QVGA, right).

In the new display, the color filter is deposited directly on the silicon substrate, reducing its distance from the light emitting layer, and the filter's color array has been modified. This helps to secure the viewing angle properties while achieving high resolution.

The microdisplay is already sampling and due to be mass-produced by the end of the year.

Sony - www.sony.net

 


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