Display Electronics

◈ AMOLED display 

    ◇ Introduction


- AMOLED display technology is most powerful candidate for the next generation displays. It has many advantages such as
light weight, thin form factor, wide viewing angle, vivid color, fast response, and so on. Furthermore, AMOLED displays
are proper to realize flexible and transparent displays, thus it is a hot research field.

- In order to realize AMOLED displays, OLED Group of IELAB has researched a number of driving methods, pixel structures,
peripheral driving circuits and driving algorithms for high quality AMOLED displays since 2002. The 18 journal papers and 34
conference papers have been published. The OLED group is interested in high resolution AMOLED display, large-sized
AMOLED TV, feedback system for luminance non-uniformity compensation, etc.

    ◇ Panel Demonstration

Current programmed boost type structure.

Voltage programmed boost type pixel

2.1-inch QCIF(176×220) full color

5-inch WVGA(800×480) full color
AMOLED panel

14-inch 1366×768 AMOLED display

    ◇ Research results

3.5-inch 480×800 luminance compensation using camera

    ◇ Research results
      · 8-bit Current Source Driver IC for Small-Size AMOLED Displays

Source Driver IC

2.1-inch qVGA AMOLED

    ◇ Research results
      · 10-bit Current Source Driver IC for Large-Size AMOLED Displays

Full chip size : 16,800 mm x 3,600 mm

◈ Micro Display

    ◇ Introduction


- Recently, microdisplays can be useful for various display applications such as pico-projectors for handheld electronics, digital
movie-projectors, and head-mounted-displays (HMDs). The technologies for microdisplays are classified as digital light
projectors (DLP), liquid-crystal-on-silicon (LCoS), and organic light-emitting diode-on-silicon (OLEDoS). One among these
technologies, an OLEDoS has many advantages such as lightweight, thinness, and low power consumption.

- Micro Display team in IELAB strives for the researches about microdisplay using various technology. The design of the pixel
structure, data driver and gate driver.

    ◇ Research areas
      · The pixel circuit, data driver and gate driver
      · Microdisplays for various application
           - Pico-projector
           - Head Mounted Display

           - Spatial optical modulator (SOM)

Optical modulation scheme

Single-pixel ribbon structure

Conceptual diagram of a projection display system using a SOM device

           - OLED on silicon (OLEDoS)
           - Single crystalline Si wafer + CMOS process + white OLED + color filter

    ◇ Research results
      · OLED-on-Silicon (OLEDoS)
          - Process: 0.35-mm CMOS
          - Area: 0.6-inch
          - Resolution : XGA (1024 X 768)
          - Color depth : 8-bit

0.6-inch 8bit XGA OLEDoS layout

0.6-inch 8bit XGA OLEDoS demonstrate image