【摘 要】
：
LED display is applied in advertising,transportation,information release,etc.Traditional LED display module includes LED board,driving PCB,plastic mask and back shell.The dot pitch of traditional LED
【机 构】
：
HKUST LED-FPD Technology R&D Center,Foshan,Guangdong,China
论文部分内容阅读
LED display is applied in advertising,transportation,information release,etc.Traditional LED display module includes LED board,driving PCB,plastic mask and back shell.The dot pitch of traditional LED display is 2.0mm above and cannot be reduced anymore.In some applications,such as mobile screen,small dimension TV,etc.,the ultra-compact dot pitch(<=1.5 mm) LED display is needed.This paper introduces a new type of LED display called COB LED display and its design and manufacturing technique are discussed.The dot pitch of the new type COB LED display can be 0.5mm using the new technology introduced in this paper.The mono-color and full-color COB LED display module are discussed and the reliability of the COB LED display is also analyzed.The wire tensile test,thermal test and thermal cycle test results proved that the COB LED display is feasible and reliable.
其他文献
马钢2号高炉在保持稳定顺行的基础上,为了降低铁水成本,生产中实施降低焦比提高煤比攻关。通过分析原燃料质量对高炉生产的影响、摸索研究高炉操作炉型的变化和长期生产实践表明:抓好精料工作是搞好高炉顺行,降低焦比提高煤比的有效途径;上下部调剂相结合,优化炉内操作高炉顺行的基础;提高风温和富氧喷煤相结合是提高煤比的保障。2012年10月起高炉煤比达到并稳定在160kg/t,其它各项经济指标也得到明显改善。
高炉净煤气人工测尘工作必不可少,承钢高炉净煤气测尘工作近几年得到了各部门的高度重视,得到准确的数据需要注意从取样系统设计到设备正确使用和数值准确计算等很多细节。
河北钢铁集团承德分公司360㎡2＃、3#烧结机余热发电项目自投产以来一直存在烟温不足的情况,环冷机一段烟温260-310℃,二段烟温150-220℃,三段烟温120-180℃,远远低于一段烟温400℃,二段烟温300℃,三段烟温200℃的设计值,余热锅炉所产生的蒸汽温度不能满足汽轮机最低350℃和192℃的设计要求,机组如何实现安全稳定运行是所面临主要问题.在确保机组安全稳定运行情况下,通过降参数
由于烧结生产的特殊性,生石灰、白云石及除尘灰等小颗粒干物料用量较大,在皮带机倒运过程中,导致一次混合机区域产生大量粉尘,粉尘排放浓度严重超标,操作环境极差,通过对原工艺布局进行优化改造并对混合机进料端进行整改后,区域扬尘现象得到有效遏制,同时有效降低了区域设备故障率.
对2号高炉优化操作的生产实践进行了总结.在原燃料质量劣化的条件下,通过加强入炉料管理,优化高炉操作制度,做好炉型维护及抓好炉外出渣铁工作等,使高炉冶炼水平不断提高,取得了较好的技术经济指标.
As the defects in the LED chip is an important factor affecting the properties of high-power LEDs,a new measurement system is proposed which can get nonradiative recombination defect densities of a LE
Temporal modulations of light from AC-LED sources can produce a number of visible artifacts,such as flicker,stroboscopic effect,etc.Flicker is common in low frequency situations,while the stroboscopic
Voltage-temperature coefficient (S) is the key parameter for measuring the light-emitting diode (LED)’s junction temperature.Common method for determining junction temperature by the S is under low cu
One of the most critical reliability problems that the LED COBs are facing is the failure of wire bonding connections.The LED COBs would easily break down due to the mechanical shocks or material stre
Single LED package based on encapsulated leadframe provides a common electrical and thermal path with dramatic reduction of its thermal resistance.The specific LED packaging technology consists of a s