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论文作者:留学生论文代写论文属性:硕士毕业论文 thesis登出时间:2011-06-03编辑:zn1987点击率:6090
论文字数:1575论文编号:org201106031413134516语种:英语 English地区:英国价格:$ 66
关键词:OLED displayOrganic light-emitting diodeIndustrial production
Views on the Present and Future Promise of OLED Displays
Abstract
Although OLED performance has been explainedquasi-quantitatively by using a radar 留学生论文网chart analysis, there arefew reports of actual quantitative evaluation results. Wequantitatively evaluated OLED optical and electricalcharacteristics and compared them with LCD and CRTperformance. OLED optical characteristics are superior tothose of LCDs. Furthermore, problems related to OLEDs arediscussed in terms of light emitting materials, device structure,and panel components.
1.Introduction
Organic light emitting displays (OLEDs) are the mostpromising candidate as a new alternative to LCDs due to theirnear-perfect viewing angle, fast response, high contrast ratio, thinstructure and lightweight. Although OLED performance has oftenbeen explained quasi-quantitatively by using a radar chart analysisthere are few reports of actual quantitative evaluation results.
We have developed a 3.5-inch full color AM-OLED.We have evaluated the optical and electrical characteristicsquantitatively and compared them with LCDs, and comparisonswere made to CRTs as well.
A future application of OLEDs is expected to be large-scaleTV use. We also simulated a hypothetical 40-inch TV andinvestigated its potential problems. Technical breakthroughsrelating to power consumption and lifetime are discussed.
2. Overview of performance
Figure 1 shows an example of the quasi-quantitative comparison of performance between OLEDs and LCDs. It is
clear that the physical characteristics of OLEDs, such as thickness and weight, are good, since a backlight is not necessary in OLEDs. In respect of picture quality, viewing angle, response time, and contrast ratio are superior in comparison with LCDs. As for color gamut, LCDs tend to cover 100% of the NTSC region by adopting an LED backlight and appropriate color filters. OLEDs should achieve this, too. Problematic areas for OLEDs are primarily power consumption and lifetime, as shown in the figure.
3. Picture quality
We fabricated a 3.5-inch full color AM-OLED and evaluated the various attributes of its picture quality. The technologies adopted in our AM-OLED were as follows: the backplane of the display was a low temperature poly-Si TFT array; the pixel circuit was a “current-copy”[1] type, which compensates for non-uniformity of the TFT threshold voltage and thereby realizes excellent image uniformity; the device structure was bottom emission type; and the RGB organic layers were vacuum evaporated using small molecule materials. A circular polarizer was attached on the panel to prevent the reflection of outside light. The specifications of the display are listed in Table 1. Display image is shown in Figure 2.
7. References
[1] M.Ohta, H.Tsutsu, H.Takahara, I. Kobayashi, T.Uemura, andY.Takubo, “A Novel Current Programmed Pixel for ActiveMatrix OLED Displays” SID’03 Digest paper, pp.108-111,2003
[2] T. Maeda, H. Tsuge, H. Kidani, H. Takahara et al., “AnImproved Current Driving Method for 256-level Full ColorActive Matrix OLED Displays” SID’04 Digest paper,pp.1572-1575, 2004
[3] N.Kamiura, K.Mametsuka, J.Hanari, K.Yamamoto,H.Sakurai, H.Hirayama, M.Kobayashi, and T.Nakazono,“Development of the Active-Matrix Type 2.85-in. Q-CIFPolymer-OLED Display Using Ink-Jet Printing Method” AsiaDisplay / IDW '01 Digest Tech. Papers, pp.1403-1406, 2001
[4] M.Kobayashi, J.Hanari, M.Shibusawa, K.Sunohara, andN.Ibaraki, “A 本论文由英语论文网提供整理,提供论文代写,英语论文代写,代写论文,代写英语论文,代写留学生论文,代写英文论文,留学生论文代写相关核心关键词搜索。