Full-Color LCD Microdisplay System Based on OLED Backlight Unit and Field-Sequential Color Driving Method

We developed a single-panel LCD microdisplay system using a field-sequential color (FSC) driving method and an organic light-emitting diode (OLED) as a backlight unit (BLU). The 0.76′′ OLED BLU with red, green, and blue (RGB) colors was fabricated by a conventional UV photolithography patterning process and by vacuum deposition of small molecule organic layers. The field-sequential driving frequency was set to 255 Hz to allow each of the RGB colors to be generated without color mixing at the given display frame rate. A prototype FSC LCD microdisplay system consisting of a 0.7′′ LCD microdisplay panel and the 0.76′′ OLED BLU successfully exhibited color display and moving picture images using the FSC driving method.

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Side-Chain Polyimides as Binder Polymers for Photolithographic Patterning of a Black Pixel Define Layer for Organic Light Emitting Diode

International Journal of Polymer Science ◽

10.1155/2018/3790834 ◽

2018 ◽

Vol 2018 ◽

pp. 1-7

Author(s):

Genggongwo Shi ◽

Sung Hoon Park ◽

Jeseob Kim ◽

Minji Kim ◽

Lee Soon Park

Keyword(s):

Light Emitting Diode ◽

Side Chain ◽

Ambient Light ◽

Light Emitting ◽

Organic Layers ◽

Organic Light Emitting Diode ◽

Organic Light ◽

Black Pixel ◽

Chain Type

A pixel define layer (PDL) in an organic light emitting diode (OLED) is patterned using a photolithographic process before the deposition of organic layers on top of ITO anode. If the patterning of PDL on OLED panels can be achieved using a black photoresist, the patterning of black matrix (BM) on top of PDL patterns can be omitted by reducing the reflection of ambient light from OLED panels. In this study, we synthesized a series of side-chain-type polyimides as binder polymers of black photoresists and investigated the potential of using the black photoresist for the fine patterning of black PDL on OLED panels.

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High Brightness White Organic Light Emitting Devices Employing Phosphorescent Iridium Complex as RGB Dopants

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.364-366.1072 ◽

2007 ◽

Vol 364-366 ◽

pp. 1072-1076

Author(s):

Rui Li Song ◽

Yu Duan

Keyword(s):

Power Efficiency ◽

Light Emitting Diode ◽

Iridium Complex ◽

Light Emitting ◽

Light Emitting Devices ◽

Organic Light Emitting Diode ◽

Organic Light ◽

Color Mixing ◽

Coordinate Changes ◽

Cie Chromaticity

An efficient phosphorescent white organic light-emitting diode (WOLED) was realized by using a bright blue-emitting layer, iridium (III) bis [(4, 6-di-fluoropheny)-pyridinato-N, C2’] picolinate doped 4.4’-bis (9-carbazolyl)-2, 2’-dimethyl-biphenyl, together with tris (2- Phenylpyridine) iridium and bis (1-phenyl-isoquinoline) acetylacetonate iridium (III) were codoped into 4,4’-N,N’-dicarbazole-biphenyl layer to provide blue, green, and red emission for color mixing. The device emission color was controlled by varying dopant concentrations and the thickness of blue and green-red layers as well as tuning the thickness of exciton-blocking layer. The maximum luminance and power efficiency of the WOLED were 37100cd/m2 at 17 V and 7.37lm/W at 5V, respectively. The Commission Internationale de 1’Eclairage (CIE) chromaticity coordinate changes from (0.41, 0.42) to (0.37, 0.39) when the luminance rangeed from 1000cd/m2 to 30000cd/m2.

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