OLED, Ư , >>
Ɽ Է° Ư, Է ȣ ȣ ΰ ȣ õ Դϴ. ߿ Ư ǹ̸ ٷϴ.
Է ϰ µǴ , Ϲ ̿ Ư Ÿϴ. , δ Ű, δ 帣 . , Է , е ǥϱ . Ű ڵ , 糪 (β) ȭ, µ, ļ ־ 鿡 ̿μ Ư ȭ б մϴ. Ʈ ȭ ڿ - Ư Ͽ ջ 캸 . ȭ ü 鿡 ϴ Ǹ, ΰ Ƶ 帣 ŵϴ. Ư ̸ ʿ, ڰ ıǴ ְ ̳ . , α Ϸ ǥϱ ϰ, ɵ ȣ а OLED 帣 Ͽ ϰ ǿ ؼ ϱ մϴ. , ̷ - Ư ֵ Բ ǥ ֵ- - Ư Ͽ Ɽ Ư Բ ֽϴ.
OLED, Ư , Ɽ
Ɽ Ưμ - Ư Բ ֵ Ÿ ֵ-- Ư ǥԴϴ. ̸ Ͽ Ư Ư Բ , м ֽϴ. , ּ ߱ ʿ ΰ (turn on voltage), Ư ֵ . ٸ ߱ ڵ ̿ ˴ϴ. ΰ ֵ е α Ϸ ǥϸ, Դϴ. ƿ, ǥ ȿ, ȿ ֽϴ.
Ư ɵ , ȭ ȸο OLED ڸ Բ Ʈ ִµ, ȣ IC Ǵ ȣ а OLED 帣 踦 ֽϴ. ȭҵ鿡 ϸ, ȭҵ鿡 ȣ а OLED 帣 , м .
ַ Ʈ м ۵˴ϴ. , ñ Ʈ ü Ʈ Ͽ ⸦ ϱ ϰ, ̶ (R), ʷ(G), Ķ(B) Ʈ ϴ 캾ϴ. Ư, ̱ ؼ 3 ġ ϴ , ϰ ˴ϴ. ̿ Բ , 3 ȥ ǥ ġϴ° м ˴ϴ.
OLED, Ư , ȿ
OLED ȿ ߿ ȿ ̷ ϸ, ̴ ȿ̳ ȿ Ͽ 츮 Ϲȭ ֽϴ. ȿ ȿ ܺ ȿ ǵǴ , ȿ ‘ΰ ’ ǹմ . , ڿ ϴ , յ ϵ ڸ ϴ , ڵ ߱ϴ . , ߱ Ե ڿ ϱ Ͽ Բ ӵ ͼ ӹ մϴ. ̷ Ͽ 100% ǥ ϰ . յ ϵ ڸ ϴ ٸ Ʈ , 25%̸, α̳ Ȱ , Ͽ 100% ϰ ֽ . ڵ , ս, ȯ ּȭ 100% ø մϴ.
ܺ ȿ ߱ Ͽ ڵ ߰ ϸ ˴ϴ. ᱹ 츮 ִ ִ . ᱹ, Ե ϵ ڸ ° ֽϴ. ο ڵ 20% ε, OLED κе , (ַ ) 鰣 ֵ Դϴ. ̷ ս ̱ ȿ . Ϸʷ ݻ Ī, ö ̼ ġ ̿ ߵǰ ֽϴ.
ȿ ϰ ǥ ϸ, ȿ(lm/W) ȿ (cd/ m2) մϴ. ȿ , ‘lm/W’ ֵ Է, (, ߱ ) ǥǴ ϴ. ȿ ߱ ȿ(luminous efficacy), ȿ ǥDZ . , и qV, Ϸ ΰ Ǹ, ڴ ܺ ȿ hv, ǰ. (и ȭҿ 帣 ΰ , ڴ ȭ ֵ (π) · ǥϱ մϴ.) ⼭ ȯ ȿ(luminous efficiency) ϴµ, ̴ Ȥ %, ״ Է° () մϴ. ٸ, OLED ǹǷ ȿ ذ . ȿ ڸ 帣 ̷ Ͽ Ǵ 踦 Ÿϴ.
OLED, Ư , , >>
Ϲ ÷ ȭ Ⱑ ʱ ֵ 50% ҵǴµ ɸ ð մϴ. ֵ ̿ܿ, ϴ ε . ̳ Һ ް ϰų ϰ Ȥ ȭ ü 쿡 Ͽٰ ֽϴ. ִ ε پѵ, ȭ ⸦ ġ پ, ΰǴ Է , Ȥ , Ƽ (duty ratio) ΰ ϱ . ÷ ȯ浵 ߿ѵ, Ư µ ų, ڿܼ 籤 ֽϴ. 䱸Ǵ Ⱓ ÷ ǰ鿡 ٸ , TV 쿡 7~10, 5 ð 䱸ǰ, 3 3 ð ʷ ֽϴ.
÷ ϱ ؼ Ʈ ϴµ, ÷̸ ȯ溸 Ȥ , ַ ٽ ȯ濡 ġϰ , ȭ (aging factor) ϴ (acceleration factor) Ͽ ϰ ֽ . Ϸʷ OLED , 60~85 µ, 80~90% , ~ Ͽ . Ȥ ǻ ƴ϶ ڿ , Ȥ ٸ , Ϲδ Ȥ ȭ Ȯ ƷϿ콺 Ͽ մϴ. ̷ ȰϿ ð ʹ , Ⱓ ܻ(extrapolation) ϱ մϴ.
Ϲ ȯ Ͽ ϴ 쵵 ִµ, 쿡 Ư α , ȭ ֵ(normalized luminance) ǥϴ 찡 . Ű δ ΰ ֵ, Ȥ ȯ濡 µ ֱ ϰ, Ȥ ߱ , ҿ ħ ϱ . ܿ ϰ δ ̳ ֵ ǥ ϴ 쵵 , Ƿ پ ǥ OLED ǰ ֽϴ.
ݱ Ɽ Ư, ȿ, ̾߱⸦ Ͽ, ܿ OLED Ư ؼ ֽϴ. Ư, ῡ Ư, , ̿ Ͽ , õ κе ߰Ǿ մϴ. ڸ鿡 , ź, , ȥŹ(haze), ° , ֿ Ư̸, Բ , Ư ǹ . ̵鿡 ؼ ð Ǯ մϴ.
OLED, ÷ >>
÷ ÷(backplane), ״ ȭ ʿ ġϿ ȭҵ ϰ, õ ȭҿ ȣ ΰϴ Դϴ. ɵ ÷̶, LCD OLED . , LCD , OLED ̹Ƿ ÷ο ġǴ ڵ, , ڸ Ʈ(TFT) Ŀн(SC) Ư ϳ, ⺻ ȭҰ Ī ɰ õ ȭ Ȥ ΰѴٴ ϸƻմϴ.
LCD ̹Ƿ ַ Ǹ TFT(a-Si TFT) ٰ Ǹ TFT(LTPS-TFT) Ͽ , OLED ̵ LTPS-TFT ȭ TFT(oxide-TFT) ֽϴ. ٸ, ȭ ũⰡ ۾鼭 a-Si TFTٴ LTPS-TFT ȭ -TFT 帧 ֵذ ִ Ȳ Դϴ. , Ϻ ߱(bottom emission) ؼ, ߱(top emission) ٴ ̳ Ʈ ڼ LTPS-TFT, ȭ- TFT ֵ. Ư , Ȥ OLED , ܼϿ ְ, ڿ ִ oxide-TFT ˴ϴ. ̿ Ͽ Ű Ǵ TFT(organic TFT) ߵǰ , ̵ ɿ Ѱ, ŷڼ ϰ ִ Դϴ.
OLED, ÷, ȭ ȸ>>
ɵ ÷̿ ȭ TFT ĿнͰ ġǾ TFT ȭҰ ȣ ġ , Ŀнʹ ȣ ΰϱ մϴ. LCD 쿡 ġҸ ϴ 1 TFT Ŀнͷ ɵ , OLED ̹Ƿ ȭ Ī TFT TFT, 2 TFT ⺻ . , ⺻ OLED ȭ ִ ȭҵ ּ TFT SC ʼ ʿ , OLED ȭҼ ּ 6 ̻ TFT ÷ ֽϴ. ȭ, ̿ TFT ߰˴ϴ. OLED ȭ ȸθ Կ ־ ݺʹ LTPS-TFT մϴ.
2 TFT 1 Ŀн, 2T + 1C ȸ , Ī TFT ĵ ΰǸ, ̴ Ī TFT Ͽ TFT Ʈ ɸ . ĵ ̵Ͽ ĿнͿ Ʈ ΰǸ, ̷ TFT ϴ OLED 帨ϴ. ٸ, ĵ Ŀн ȯǴ Ϻ ϰ Ͼ, ̷ ġ . TFT ϰų, OLED ȭ OLED TFT Ư OLED - Ư ΰ ϰ ˴ϴ.
, LTPS-TFT ȭ ַ ø Ҹ(Excimer Laser Annealing, ELA) ˴ϴ. , TFT (grain boundary) ġϴĿ , Ư, Ư . ϴ Ͽ TFT Ư ϸ, ̴ ȭ ȸ ߿ Դϴ. ̿ Բ ȭ Ŀ 輱 ̰ 鼭 輱 帣 (I), (R) IR ʿϰ . ȭ OLED ȭ OLED ϴ ȭ ȸδ , г ܺ ȸο پ ȸε ʿ ϰ ˴ϴ.
, TFT ַ n-äκٴ p-ä TFT մϴ. n-ä TFT , ̵ Ī ӵ ٴ , Ÿ (VDATA) TFT Ʈ-ҽ (VGS) OLED ذ ذ (VOLED) ɸ . , OLED ð ϸ鼭 OLED (IOLED) ϰ Ǿ TFT VGS , VOLED ް, ̷ Ͽ IOLED ܻ (image sticking) ֽϴ. ݸ鿡 p-ä TFT , VDATA VGS ˴ϴ. , OLED - Ư ϴ, VGS ǹǷ IOLED ϰ ˴ϴ .
... ȣ ̾
“ ְ ظ ϰ , ο ڷ پϿ ǥ , ٶϴ.”
<۱ڨ 'öƽ̾' - .>
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