2005年7月17日
#
LCD( Liquid Crystal Display)投影机分为液晶板投影机和液晶光阀投影机两类。液晶是介于液体和固体之间的物质,本身不发光,工作性质受温度影响很大,其工作温度为-55ºC~+77ºC。投影机利用液晶的光电效应,即液晶分子的排列在电场作用下发生变化,影响其液晶单元的透光率或反射率,从而影响它的光学性质,产生具有不同灰度层次及颜色的图像。
LCD投影机有两种。
液晶板投影机
成像器件为液晶板,是被动式的投影方式。利用外光源金属卤素灯或UHP(冷光源)。
按照液晶板的片数,LCD 投影机分为三片机和单片机

三片LCD板投影机原理是光学系统把强光通过分光镜形成RGB三束光,分别透射过RGB三色液晶板;信号源经过AD转换,调制加到液晶板上,通过控制液晶单元的开启、闭合,从而控制光路的通断,RGB光最后在棱镜中汇聚,由投影镜头投射在屏幕上形成彩色图像。目前,三片板投影机是液晶板投影机的主要机种。
LCD单板投影机机体积小,重量轻,操作、携带极其方便,价格比较低廉。但其光源寿命短,色彩不够均匀,分辨率较低。 目前单板投影机的机型已经很少。
从图像品质上,单片机的表现要比三片机逊色不少。LCD投影机示意
液晶光阀投影机
采用CRT管和液晶光阀作为成像器件,是CRT投影机与液晶与光阀相结合的产物。为了解决图像分辨率与亮度间的矛盾,它采用外光源,也叫被动式投影方式。一般的光阀主要由三部分组成:光电转换器、镜子、光调制器,它是一种可控开关。通过CRT输出的光信号照射到光电转换器上,将光信号转换为持续变化的电信号;外光源产生一束强光,投射到光光阀上,由内部的镜子反射,能过光调制器,改变其光学特性,紧随光阀的偏振滤光片,将滤去其它方向的光,而只允许与其光学缝隙方向一致的光通过,这个光与CRT信号相复合,投射到屏幕上。它是目前为止亮度、分辨率最高的投影机,亮度可达6000ANSI流明,分辨率为2500×2000,适用于环境光较强,观众较多的场合,如超大规模的指挥中心、会议中心及大型娱乐场所,但其价格高,体积大,光阀不易维修。 对追求高分辨率、高亮度、大画面的用户,液晶光阀投影机是他们的首选。
科普小知识
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你的皮鞋老是脏吗?如何快速的把他们擦干净呢?哦!擦鞋机来了,有了擦鞋机以后,一切就OK了!flock1234.mblogger.cn
智力竞赛上,抢答器是选手胜利的关键,如何选购抢答器呢?有很多窍门的!!!field6666.mblogger.cn
膜结构是个什么东西我也说不清楚!还有光端机,什么是光端机啊!科技年代,我又落后了!faint1234.mblogger.cn
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2005年7月3日
#
英语学习三十二课必修句(1)
1. As I had plenty of money I was able to help her.
我钱很宽裕,能帮助她。
2. He is an able man.
他是一个能人。
3. I dropped my key somewhere about here.
我把钥匙掉在这附近某个地方了。
4. Tell me all about it.
告诉我关于这件事的一切。
5. He was about to start.
他即将动身。
6. It is about six o'clock now.
现在是六点钟左右。
7. The children are rushing about.
孩子们到处乱闯。
8. My bedroom is just above.
我的卧室就在上面。
9. The sun rose above the horizon.
太阳升到地平线上。
10. This book is above me.
这本书对我来说是太难了。
11. His conduct has always been above suspicion.
他的行为一直无可质疑。
12. The police are not allowed to accept rewards.
警察是不允许接受酬金的。
13. They accepted responsibility for the accident.
他们承认了对这次事故所负的责任。
14. It is generally accepted that smoking is harmful to our health.
吸烟有害健康,这是大家公认的。
15. According to our records, the books you have borrowed should now be returned to the library.
根据我们的记录,你借的书现在应该还给图书馆了。
16. According to these figures, our company is doing well.
从这些数字来看,我们的公司经营得不错。
17. I have an account with Midland Bank.
我在米德兰银行开有户头。
18. His illness accounts for his absence.
他因为生病,所以才缺席。
19. A man is accounted innocent until he is proven guilty.
一个人未被证明有罪前,被视为是清白的。
20. We own 100 acres of farmland.
我们拥有一百英亩农田对讲机。
21. Can you swim across the river?
你能游到河的对岸吗?
22. The two lines cut across each other.
两条线相交。
23. Parliament has passed an Act forbidding the killing of rare animals.
国会通过了一项法令, 禁止捕杀珍稀动物。
24. Think well before you act.
要三思而后行。
25. Actions speak louder than words.
行动胜于空谈。
26. The action lasted three hours.
战斗持续了三个小时。
27. He added some wood to increase the fire.
他加了一些木柴,使火旺些。
28. If you add 4 to 5, you get 9.
四加五等于九。
29. The little girl is not very clever at addition.
这个小女孩不太善于做加法。
30. In addition to giving a general introduction to computer, the course also provides practical experience.
课程除了一除湿机般介绍电脑知识外,还提供实际操作的机会。
31. There is a letter addressed to you.
有封写给你收的信。
32. He addressed the audience in an eloquent speech.
他向听众发表了雄辩的演说。
33. You may not like him, but you have got to admire his persistence.
你可以不喜欢他,技术但你不得不佩服他那种坚韧不拔的精神。
34. I must admit, it's more difficult than I thought it would be.
我必须承认,这比我想象的要困难得多。
35. He was admitted to the hospital suffering from burnsCall Center.
他由于烧伤,被送入医院治疗。
36. The date of the meeting has been advanced from Friday to Monday.
会议日期已经从星期五提前到星期一。
37. There have been great advances in medicine in the last ten years.
在过去十年里,医学取得了巨大的进步。
38. It is a popular show, so advance booking is essential.
这是个很受欢迎的演出,所以一定要提前订票。
39. Earthenware has an advantage over wood in being more easily kept clean.
陶器的优点在于比木器更容易保持清洁。
40. Her rich experience gave her an advantage over other applicants for the job.
她丰富的经验使她比其他求职者具有有利条件。
41. I asked the teacher for her advice.
我征求这位老师的意见。
42. If you take my advice, you won't tell anyone about this.
你要是听我劝告的话,最好别向任何人透露此事。
43. He gave me some good advice.
他向我提了一些很好的意见。
44. The minister is busy with important affairs of state.
部长忙于重要国务。
45. Mind your own affairs!
别管闲事!
46. She was afraid that the dog would bite.
她害怕这狗会咬人。
47. Africa is a mysterious land to him.
对他来说,非洲是一片神秘的土地。
48. We shall arrive soon after.
我们将随后很快就到达。
49. Mr. Smith left for London after breakfast.
史密斯先生吃过早餐后就动身去伦敦了。
50. I found your coat after you had left the house.
你离开房子之后,我发现了你的外衣。
51. He grew weak in after years.
在以后的几年里,他变得衰弱了。
听力训练的几个具体问题
英语培训猫腻多
香港大力推广职业英语培训
英语培训消费将趋于理性(二)
英语培训消费将趋于理性(一)
^_^无休止的工作,无休止的付出,付出之后我们得到了什么,每天我背包,走在人潮人海中,为了明天的明天,我要拼命工作,为了我那美丽的姑娘,为了我曾经许下的诺言-我会给你最好的!
现如今,服务行业竞争激烈的年代,谁能做的优秀,谁才能把握市场@优秀的视频会议系统@先进的对讲机技术@优良的Call Center服务@快捷的新闻资讯@专业的商标注册代理@解答商标注册注册中遇到的问题,做成最优秀的商标代理!性能优良的投影机!我爱商标网@我爱新闻网@最爱商标网@我爱移民网@-这些都是本人收集的一些资料做的不好,^_^我是个很好学,却也很笨的人.------祝斑竹生意兴隆,小弟在这罗嗦了几句,请不要介意,开心每一天^_^ ^_^
英语学习三十二课必修句(1)
1. As I had plenty of money I was able to help her.
我钱很宽裕,能帮助她。
2. He is an able man.
他是一个能人。
3. I dropped my key somewhere about here.
我把钥匙掉在这附近某个地方了。
4. Tell me all about it.
告诉我关于这件事的一切。
5. He was about to start.
他即将动身。
6. It is about six o'clock now.
现在是六点钟左右。
7. The children are rushing about.
孩子们到处乱闯。
8. My bedroom is just above.
我的卧室就在上面。
9. The sun rose above the horizon.
太阳升到地平线上。
10. This book is above me.
这本书对我来说是太难了。
11. His conduct has always been above suspicion.
他的行为一直无可质疑。
12. The police are not allowed to accept rewards.
警察是不允许接受酬金的。
13. They accepted responsibility for the accident.
他们承认了对这次事故所负的责任。
14. It is generally accepted that smoking is harmful to our health.
吸烟有害健康,这是大家公认的。
15. According to our records, the books you have borrowed should now be returned to the library.
根据我们的记录,你借的书现在应该还给图书馆了。
16. According to these figures, our company is doing well.
从这些数字来看,我们的公司经营得不错。
17. I have an account with Midland Bank.
我在米德兰银行开有户头。
18. His illness accounts for his absence.
他因为生病,所以才缺席。
19. A man is accounted innocent until he is proven guilty.
一个人未被证明有罪前,被视为是清白的。
20. We own 100 acres of farmland.
我们拥有一百英亩农田对讲机。
21. Can you swim across the river?
你能游到河的对岸吗?
22. The two lines cut across each other.
两条线相交。
23. Parliament has passed an Act forbidding the killing of rare animals.
国会通过了一项法令, 禁止捕杀珍稀动物。
24. Think well before you act.
要三思而后行。
25. Actions speak louder than words.
行动胜于空谈。
26. The action lasted three hours.
战斗持续了三个小时。
27. He added some wood to increase the fire.
他加了一些木柴,使火旺些。
28. If you add 4 to 5, you get 9.
四加五等于九。
29. The little girl is not very clever at addition.
这个小女孩不太善于做加法。
30. In addition to giving a general introduction to computer, the course also provides practical experience.
课程除了一除湿机般介绍电脑知识外,还提供实际操作的机会。
31. There is a letter addressed to you.
有封写给你收的信。
32. He addressed the audience in an eloquent speech.
他向听众发表了雄辩的演说。
33. You may not like him, but you have got to admire his persistence.
你可以不喜欢他,技术但你不得不佩服他那种坚韧不拔的精神。
34. I must admit, it's more difficult than I thought it would be.
我必须承认,这比我想象的要困难得多。
35. He was admitted to the hospital suffering from burnsCall Center.
他由于烧伤,被送入医院治疗。
36. The date of the meeting has been advanced from Friday to Monday.
会议日期已经从星期五提前到星期一。
37. There have been great advances in medicine in the last ten years.
在过去十年里,医学取得了巨大的进步。
38. It is a popular show, so advance booking is essential.
这是个很受欢迎的演出,所以一定要提前订票。
39. Earthenware has an advantage over wood in being more easily kept clean.
陶器的优点在于比木器更容易保持清洁。
40. Her rich experience gave her an advantage over other applicants for the job.
她丰富的经验使她比其他求职者具有有利条件。
41. I asked the teacher for her advice.
我征求这位老师的意见。
42. If you take my advice, you won't tell anyone about this.
你要是听我劝告的话,最好别向任何人透露此事。
43. He gave me some good advice.
他向我提了一些很好的意见。
44. The minister is busy with important affairs of state.
部长忙于重要国务。
45. Mind your own affairs!
别管闲事!
46. She was afraid that the dog would bite.
她害怕这狗会咬人。
47. Africa is a mysterious land to him.
对他来说,非洲是一片神秘的土地。
48. We shall arrive soon after.
我们将随后很快就到达。
49. Mr. Smith left for London after breakfast.
史密斯先生吃过早餐后就动身去伦敦了。
50. I found your coat after you had left the house.
你离开房子之后,我发现了你的外衣。
51. He grew weak in after years.
在以后的几年里,他变得衰弱了。
听力训练的几个具体问题
英语培训猫腻多
香港大力推广职业英语培训
英语培训消费将趋于理性(二)
英语培训消费将趋于理性(一)
^_^无休止的工作,无休止的付出,付出之后我们得到了什么,每天我背包,走在人潮人海中,为了明天的明天,我要拼命工作,为了我那美丽的姑娘,为了我曾经许下的诺言-我会给你最好的!
现如今,服务行业竞争激烈的年代,谁能做的优秀,谁才能把握市场@优秀的视频会议系统@先进的对讲机技术@优良的Call Center服务@快捷的新闻资讯@专业的商标注册代理@解答商标注册注册中遇到的问题,做成最优秀的商标代理!性能优良的投影机!我爱商标网@我爱新闻网@最爱商标网@我爱移民网@-这些都是本人收集的一些资料做的不好,^_^我是个很好学,却也很笨的人.------祝斑竹生意兴隆,小弟在这罗嗦了几句,请不要介意,开心每一天^_^ ^_^