4.1: Invited Paper: Full‐Color Organic EL Display

Abstract

For the first time, we report a full color organic display with 10 inch diagonal size and high resolution (VGA). This display was based on blue organic EL with color changing mediums (CCM). A blue emitting material with heat resistance was developed and used. In the construction of the full color display, we used a tapered In2O3‐ZnO with an Al auxiliary electrodes as an anode with a low resistivity of 2Ω/square. In addition, the CCM structure was improved in order to increase a contrast ratio of the display.

Recent progress of molecular organic electroluminescent materials and devices

“…The second one utilizes blue OLEDs as a light source with fluorescent color arrays as color-changing media (CCM) to obtain RGB colors (Fig. 44b) [359,360]. This method does not require organic layer patterning, but its low color change efficiency especially for red color is undesirable.…”

Blue fluorescent OLED materials and their application for high-performance devices

“…It was thought that the practical application of organic EL was difficult. Even though the emission color of styrylamine-doped devices [2] was light blue, the materials were improved, and a practical lifetime of 10 000 h was achieved for the first time [9]. A prototype 5-inch video graphics array (VGA) display to demonstrate video-rate pictures and fast response was reported in 1997.…”

P-20: An AMOLED Pixel for the VT Compensation of TFT and a p-Type LTPS Shift Register by Employing 1 Phase Clock Signal

“…Organic light emitting diode (OLED) displays have attracted public attention due to their high brightness, high efficiency, fast response time, and wide viewing angle [1,2]. Low temperature polycrystalline silicon thin film transistors (LTPS TFTs) are widely used in active matrix organic light emitting diode (AMOLED) displays, due to the high current driving capability [3].…”

“…However, the inevitable non-uniformity of the poly-Si TFTs' electrical characteristics, such as threshold voltage shifts due to fluctuations in excimer laser energy, result in variation in the OLED current. In order to solve the non-uniformity problem, several voltage modulation and current programming methods have been devised [1,[3][4][5]. These studies are very effective to compensate the threshold voltage variation, but they require some additional independent control signals and complex driving scheme.…”