ELECTROLUMINESCENT DISPLAYS

4.2. Operating Principles of TFEL Devices Electroluminescent Displays 목차 4.1. 서론 4.2. Operating Principles of TFEL Devices 4.3. Electrical Characterization of TFEL Devices 4.4. EL 디스플레이 4.5. ELD의 응용 4.6. 결론

Electroluminescent Displays 4.1. 서론

Electroluminescent Displays

전계발광 디스플레이의 역사  EL emission from ZnS phosphor powder found in Electroluminescent Displays 전계발광 디스플레이의 역사  EL emission from ZnS phosphor powder found in 1936 by Destriau (yellow emission).  AC powder EL studied until 1960 but efficiency and life time very poor.  AC thin-film EL(TFEL) with long life time developed by Inoguchi.  Volume production of monochrome ELD in 1983 by Planar Systems.

Electroluminescent Displays

Electroluminescent Displays

Electroluminescent Displays

Electroluminescent Displays

EL480.240-PR2 EL Panel EL640.480-AM1 EL Display Electroluminescent Displays EL480.240-PR2 EL Panel EL640.480-AM1 EL Display

Fig. (a) Standard and (b) inverted ac TFEL stack. Electroluminescent Displays Fig. (a) Standard and (b) inverted ac TFEL stack.

Figure 1. Structure of Thin Film EL Electroluminescent Displays Figure 1. Structure of Thin Film EL

Figure 1. Structure of Thin Film EL Electroluminescent Displays Figure 1. Structure of Thin Film EL

Fig. Structure of a conventional TFEL device Electroluminescent Displays Fig. Structure of a conventional TFEL device

Electroluminescent Displays Fig. Physical processes resulting in light emission from an an TFEL stack.

Electroluminescent Displays

Figure 2. Integral Contrast Enhancement Electroluminescent Displays Figure 2. Integral Contrast Enhancement

Figure 3. EL Temperature Range Figure 4. Wide Viewing Angle Electroluminescent Displays Figure 3. EL Temperature Range Figure 4. Wide Viewing Angle

Low Electromagnetic Interference (EMI) means Electroluminescent Displays Low Electromagnetic Interference (EMI) means simplified designs and "clean" environments Figure 5. EMI Signature

Figure 6. Fast Response Time Electroluminescent Displays Fast Response Time means crisp, clear and accurate wave form representations. Figure 6. Fast Response Time

Long Term Reliability means Electroluminescent Displays Long Term Reliability means reduced warranty cost and improved customer satisfaction. Figure 7. Lifetime Hours

Electroluminescent Displays

Fig. EL Emission Spectra of ZnS:Mn Phosphor. Electroluminescent Displays Fig. EL Emission Spectra of ZnS:Mn Phosphor.

Fig. EL Emission Spectra of ZnS:Tb Phosphor. Electroluminescent Displays Fig. EL Emission Spectra of ZnS:Tb Phosphor. Fig. EL Emission Spectra of ZnS:Mn Phosphor.

Fig. EL Emission Spectra of CaS:Eu, CaS:Ce, and SrS:Ce Phosphors. Electroluminescent Displays Fig. EL Emission Spectra of CaS:Eu, CaS:Ce, and SrS:Ce Phosphors.

Fig. EL Emission Spectra of CaGa2S4:Ce Phosphor. Electroluminescent Displays Fig. EL Emission Spectra of CaGa2S4:Ce Phosphor.

Electroluminescent Displays C.I.E. Chromaticity Diagram

SrS:Ce/ZnS:Mn broad band phosphor Electroluminescent Displays SrS:Ce/ZnS:Mn broad band phosphor Fig. EL Emission Spectra of "white" Phosphor at 60 Hz and 5 kHz Drive Frequency

Electroluminescent Displays Active Area: 0.61"x0.45" Total Thickness: 68 mils (1.7 mm) Matrix: 640x480 Density: 1000 lpi Monochrome Wavelength: Yellow (585 nm) Brightness @ 31 cycles/frame: 75 fL (257 cd/m2) Contrast Ratio: 100:1 Display Power Typical Pattern: 0.5 W Maximum: 0.7 W Defects Pixels: < 10, Lines: 0 Weight < 3 grams Data Refresh Rate: 60 frames/ sec. Operating Temperature Min. / Max.: -40deg;C to +75°C Monochrome AMEL Display

Electroluminescent Displays Active Area: 0.61"x0.45" Total Thickness: 0.36" (9.1 mm) Color Matrix: 640x480 Density: 1000 lpi @ 30 cycles/frame: 10fL (34 cd/m2) [goal=30fL] Contrast Ratio: 100:1 Display Power Typical Pattern: 1.3 W Maximum: < 2.0 W Defects Pixels: < 10 Lines: 0 Weight < 10 grams Data Refresh Rate: 60 frames/ sec. Operating Temperature Min. / Max.: -20°C to +50°C Color Active Matrix EL Displays