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The CBB Based Flat Panel Display Technology

Author: LiuHongJun
Tutor: YangXin；ChenChenZuo
School: Shanghai Jiaotong University
Course: Flat Panel Display
Keywords: Color By Blue Color Change Materials Screen Printing Ultraviolet Curing Conversion Efficiency
CLC: TN873
Type: Master's thesis
Year: 2009
Downloads: 49
Quote: 0
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Abstract

As we know, there are various methods to achieve the color of the popularity for the display. Such as the method of RGB light-emitting directly, or the way of RGB three primary colors filtered by the color filters, etc. In this paper, another method called the color conversion method is studied. This method is also known as CBB (Color By Blue) technology. That is to say, Blue background stimulates CCM (Color Change Materials) materials (part of photoluminescence of fluorescent material), accessing to red and green color, which can be composed to three primary colors on the background of blue. The CBB process is simple and low cost compared with three lithography forming process of CF technology in LCD display, And it has higher luminous efficiency to white light + CF method. Compared to direct light with red, green, and blue color, it avoids the displays color cast problem caused by the different life, different luminous efficiency and different attenuation of three primary colors. In order to achieve the broad application of CBB technology in the field of flat panel display, first of all is ?to improve the light conversion efficiency. the other is to enhance the pixel precision in different applications.In this paper, the principle, structure and manufacturing process of the current various color displays are introduced. And the CBB technical characteristics and advantages are analyzed. The technical difficulties are key researched to achieve CBB technology. And for these two difficulties, the experimental program, testing and evaluation means are developed in this paper.(1) Color conversion film formulaThe fluorescent conversion materials are a key role. There are two fluorescent conversion materials: organic materials and inorganic materials. The organic material has a higher conversion efficiency through test analysis. In this paper, I carried out some testing, analysis and presentations regarding color conversion materials(CCM) applied to the electroluminescence (EL) displays. Screen printing method, UV curing methods and so on are used to prepare for color conversion film in the active light-emitting-type electroluminescent displays. A better color conversion film formula is got eventually by a large number of experiments, adjustment of the various paint additives , improving the coating viscosity, surface tension, curing properties and adhesion parameters; ?(2) The process parameters to obtain high conversion efficiencyIn this paper, the CCM film formulation and preparation process are studied from different paint formulations, different fluorescent pigment content, different color conversion film thickness and different degrees of blue light and the impact of color purity. And the relationship curve is established among of them. The CCM conversion efficiency is improved through the accumulation of a large number of experiments, analysis and data feedback. The conversion efficiency of green materials is from the beginning 40% ~ 50% to 200%. The conversion efficiency of red materials is from the beginning 20% ~ 30% to 90%. At last, we get the formulation with the best conversion efficiency and the preparation method of color conversion film through experiments.The domestic independent R & D ability of CBB techonology is improved. A number of technological problems of CBB technology process are solved through experiments and research in this paper. We can achieve the required color of flat-panel displays through using CBB technology in this paper. And the research content of this paper belongs to the field of flat panel display and solid-state lighting of common technology, the research results can be widely applied to organic or non-light-emitting displays, liquid crystal display and semiconductor lighting, the technology has great practical value.

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