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High Resolution

Pixel Density

Fineness of a display is expressed by pixel density (ppi = pixels per inch). Since pixels are not visually distinguishable in a high pixel density (= high resolution) display, pictures and characters are displayed smoothly and crisply.

  • Comparison of picture quality (example)
  • Comparison of character font

Low Temperature Poly-silicon

The raw material of TFTs is silicon, a semiconductor. It is very difficult to pattern onto glass, and only amorphous silicon could be patterned in the past. However, electrical resistance of amorphous silicon is large, and it is not possible to drive a large amount of electrons in a short period of time. Therefore, a low temperature poly-silicon (LTPS) TFT, which utilizes a large particle-diameter polycrystalline structure, was developed.

A low temperature poly-silicon TFT has a high-performance transistor, and it is possible to pattern part of the display drive circuitry onto the glass. JDI has developed low temperature poly-silicon displays, and has introduced one of the world’s highest resolution display prototypes.

Prototype Specifications
Screen size 2.3-inch (5.9cm) diagonal
Number of pixels 1280×800 (WXGA)
Resolution density 651ppi
Pixel pitch 39μm
Number of colors 16.7million colors