OLED technology progress from FPD 2008

FPD2008 was held on October 29~31 in Yokohama, Japan, a total of 326 companies (Japan's 267, overseas 59), the exhibition of the 868 stalls. The organizers also held many seminars and OLED related to the theme of the seminar, a total of five games, OLED exhibition area becomes small, but Samsung SDI exhibited a small size AMOLED put up a pageantry are 40 inches, 31 inches, 14 inches OLED TV and leading the world, additional diversity of different functions, three days are packed with at any time people stopped to watch, odd crystal photoelectric also shows 25 inches OLED TV and small size commercial products, due to the absence of Sony OLED panel into Taiwan, Korean manufacturers competing with the situation, but also the continuation of the Sony launched the first OLED TV, OLED industry lively.

OLED display

1.Samsung SDI

Samsung SDI of large-scale exhibition of a series of AMOLED products, one of the most striking is the 40 inch, 31 inch and 14 inch parallel OLED TV (Figure 1), the 40 inch OLED TV picture quality is clear and beautiful, pixel is 1920 * 1080, the relevant specifications and features please refer to figure 2, but second days there is a clear picture on the left line defect, the third day of the line defect became more coarse, 40 inches display technology is still a challenge, 31 inch and 14 inch is a good performance. Other more striking is the world's thinnest 4 "Flapping AMOLED panel, only 50 mu m thick (Fig. 2), the company put two pieces of product is suspended in the air, and then use the fan to show display products hair dancing in the wind like substrate by using etching thin glass, using thin film package package, extension of this show exhibits for last year's 4" 0.25mm bendable AMOLED, just put the glass substrate grinding thinner. Another 6.5 Flexible AMOLED panel (Figure 3), the substrate looks like a plastic substrate, Top-emitting structure, the screen looks like dark spots and line defect are many. There are 4 pieces of Transparent AMOLED panel (Figure 4), the degree of penetration of the panel is not very good, only 30%. Samsung SDI generous display AMOLED, showing its technology development has been in the lead and the determination of the development of AMOLED.

Figure 1 Samsung SDI display 40 inches, 31 inches and 14 inches OLED TV

Figure 2 Samsung SDI show thickness of only 50 m of 4 "AMOLED

Figure 3 Samsung SDI 6.5 "Flexible AMOLED panel

Figure 4 Samsung SDI shows 4 pieces of 12.1 "Transparent AMOLED panel

2 odd crystal photoelectric (CMEL)

Odd optical crystal thickness only 0.9mm display 25 inch OLED panel (Figure 5), mainly for the development of metal packaging to thin, this technique named "Metal encapsulated module (MEM), TFT glass plate thickness 0.6mm, thick 0.3mm encapsulation resin and metal parts. Metal packaging in addition to achieve thin, but also can make the components better heat dissipation. However, two pieces of 25 inch panels are very reflective, I do not know whether it is because of the high brightness to achieve the performance and did not stick polaroid. Also exhibited a small molecule AMOLED 4.3 inch Solution process, this panel is Dupont and Dainippon screen (SCREEn) company, Dainippon screen also shows a completely same panel (Figure 6). In the part of the commercial product exhibition of 2 ", 2.2", 2.4 "and 2.8", 4.3 "and 7.6" products, the relevant specifications and last year showed similar, but NTSC is increased to 80%, displayed on the color saturation performance further.

Figure 5 odd crystal photoelectric newly developed thickness of only 0.9 mm TV TV with a thickness of 4 OLED before the thickness of 25 mm of 25 OLED

Figure 6 shows the Solution AMOLED magic crystal photoelectric (left), Dainippon screen (Screen), Solution AMOLED (right) show

3.OLED material

The fluorescent material - Idemitsu blue, green, red and white light emitting efficiency of Fintech in April 2008 published roughly the same, but the service life are improved, the green light, red light can reach 280 thousand hours up to 160 thousand hours, the white light has reached 100 thousand hours, blue materials up to 50 thousand hours. In addition, the green and red phosphorescent materials were published, and the efficiency and life of 71cd/A, 120000hrs and 20cd/A, 150000hrs, red phosphorescent material and UDC cooperation.

UDC in recent years, with the United States, Japan, South Korea and other companies to actively develop and promote its phosphorescent material, compared with last year, in addition to a slight increase in the lives of others did not make much progress. In addition, it is also actively developing solution process phosphorescent materials.

4 large area OLED process technology

DuPont in recent years to develop solution process to fabricate small molecule OLED, that can save materials and large area fabrication cost is low, the investment cost of approximately G4 evaporation process of 2.5 points from 1 to 1/3, the DuPont solution process is not in-jet printing, printing for the use of high-speed mobile Nozzle continuous spray a solution called Nozzle printing (Figure 7), G4 2.2 "QVGA Tact time substrate is less than 90 seconds, the plate to plate film thickness uniformity 7%.

Nozzle printing DNS (DAINIPPON SCREEN equipment MFG) development company, currently G4 size equipment shipments, is expected to yield up to 10 thousand pieces per month G4 size, TFT board in cooperation with the odd crystal, the largest demo at 4.3 inches in size or odd, crystal and DNS all exhibited a booth.

Figure 7 DNS developed Nozzle printing device