lcd tv.ppt

1、English for Electronic Technology,Passage 1 How does a liquid crystal TV work?,Unite Two Electronic Products,Key points: useful terms and the working principle of LCD Difficult points: describe the features of LCD TV,Requirements:,1. be able to have a good command of the knowledge of liquid crystal

2、display TVs,2 can use the terms that and science knowledge of to describe the working principle of LCD TVs,3. know some reading skills,REVIEW-write down the English of the following Chinese,电阻 波导管 转盘 n. 剩货,残留物,剩饭 硬件 n. 软件,电流 电荷 电压 电 电的 电子 电子的,New Words 电视,New Words & Expressions,New Words & Expressi

3、ons-learn to say,Fig. fig - written abbreviation for figure fig /-jr/ (PICTURE) 30-thirty inches 1 inch = 2.54 centimeter(厘米) 1/10th-one tenth,1/1000th,New Words & Expressions-get to know,Different types of TV black and white TV color TV,New Words & Expressions-get to know,Different types of TVs bla

4、ck and white TV color TV,New Words & Expressions-get to know,Different types of TV liquid display TV (LCD TV) 液晶显示电视机 cathode ray tube TV 显像管电视机 plasma TV 等离子电视机,New Words & Expressions-get to know,Different types of TV analog TV nl:g 模拟电视机 digital TV 数字电视机 diditl ,A digital TV decodes the MPEG-2 si

5、gnal and displays it just like a computer monitor does,New Words & Expressions,magnet /mg.nt/ n. 磁体,磁铁 la la la magnetic /mgnet.k/a. 有磁性的 la la la magnetism /mg.n.t.zm/ n. 磁性, ,磁学 la la la la electromagnet /,lek.trumg.nt/ n. 电磁石 lalalalalala electromagnetic /,lek.tr.mgnet.k/ a. 电磁的 lalalalalalala el

6、ectromagnetism /,lek.trmg.n.t.zm/ n. 电磁,电磁学 lalalalalalala,Talk and speak,Reading Comprehension,英语长句的分析 造成长句的原因 修饰语过多 并列成分多 语言结构层次多。 分析的方法： 找出全句的主语、谓语和宾语, 从整体上把握句子的结构。 找出句中所有的谓语结构、非谓语动词、介词短语和从句的引导词。 分析从句和短语的功能, 例如, 是否为主语从句, 宾语从句, 表语从句等,若是状语,它是表示时间、原因、结果、还是表示条件等等。 分析词、短语和从句之间的相互关系, 例如, 定语从句所修饰的先行词是哪一

7、个等。 注意插入语等其他成分。 注意分析句子中是否有固定词组或固定搭配。,Reading Comprehension,About snow crystal Have you ever seen a snow crystal? Sometimes it s possible to see them for a short moment when snow lands on your hand, but most of the time it melts before you get to see the beautiful hexagon-shaped (six-sided) crystals.

8、 melt: melt v. 熔化,溶解,Reading Comprehension,About snow crystal Crystals are made up of particles that are arranged in a regular pattern and usually come in solid form. For example, when snow melts, it turns into water and lose its crystal shape.,Reading Comprehension,About states of most subjects Do

9、you know that there are three states for most objects: solid, liquid and gas? Most things only in these three forms. However, some material can remain in a state that is somewhat between a solid and a liquid. In this sate, the object is a liquid but still maintains the regular crystal like arrangeme

10、nt.,Reading Comprehension,About a crystal If you put a nail in the middle of two magnets, the ends of the nail will try to point towards each magnet. Similarly, crystals do not have a round shape but have a long narrow shape and when electricity is pass through a crystal, it tries to align itself th

11、e direction of the electrical flow.,align lain -to put two or more things into a straight line,Reading Comprehension,In a liquid TV, many small compartments are left between two pieces of glass. Each of these compartments holds liquid crystals that are colored red, blue or green. Even if light is sh

12、ined on the back of the screen, the screen remains black because the liquid crystals are not active and block any light from passing through it.,Reading Comprehension,However, when electricity passes through a blue compartment, the liquid crystal in that compartment become active and allow light thr

13、ough. Thats how a screen becomes blue. (Fig.4.9) The way different colors are made by combining the three primary colors of light (red, blue and green) is the same as the cathode ray tube TV, but in this case, the shutters of the liquid crystal block or let light pass and thats how different colors

14、are made.,Reading Comprehension-read by Ss,The space between the two sheets of glass that we talked about before is only 5/1000th of a millimeter, that is 1/10th the thickness of a piece of hair. Its amazing that people have invented a way to control the movement of liquid crystals in such a small s

15、pace. Whats more amazing is that people have developed a way to support these two pieces of glass between such a small space without letting it bend or sag. In fact, making a 30 TV of this size is a very ,very difficult task.,Reading Comprehension -read by Ss,Another difficult part of the liquid crystal TV is that the screen looks dark from an angle because the technology is based on a shutter closing or opening to allow light through. Yet, people have found a way to solve these difficulties and made liquid-crystal TVs that some said could never be made. You never