你有没有想过你的 have you ever thought of your
智能手机的多点触摸屏 smartphones multi-touch screen as
功能上类似于您的身体皮肤 functionally similar to your body skin
和我在一起 stay with me here
两者都能够感应到多点触摸 both are able to sense multiple touches
然后两个人都可以做出决定 and then both are able to make decisions
并根据我们的投入采取行动 and act on those inputs we take for
理所当然地能够感觉到 granted being able to feel and sense the
我们周围的环境但翻译 environment around us but translating
这些感觉对电子设备和 these senses to electronic devices and
建立像多点触控的东西是 building something like multi-touch is
在这个分支情节中没有琐碎的任务 no trivial task in this branch episode
我们将讨论工程师 we are going to discuss how engineers
创建可以识别的屏幕 created screens that could discern
智能手机中的多次触摸 multiple touches in smartphones this
情节是情节的一个分支 episode is a branch of the episode how
进行触摸屏显示时， does a touchscreen display work which
进入物理和基础 goes into the physics and basic
投射电容后面的结构 structure behind projected capacitive
触摸屏以及LED显示屏和 touchscreens as well as LED displays and
钢化玻璃，所以我建议您服用 toughened glass so I recommend you take
看一下你是否还没看过 a look if you haven't seen it
[音乐] [Music]
好吧，让我们潜入这个触摸屏 okay so let's dive in this touchscreen
由40朵蓝色的玫瑰制成， is made of 40 rose colored in blue and
80列颜色显示为黄色 80 columns colored in yellow the result
是具有3,000个交叉点的网格 is a grid with over 3,000 intersections
并且您的手机可以感应到每个触摸 and your phone can sense a touch at each
这些交叉路口，我们将进入 of those intersections we'll get into
它是怎么做到的，但是现在 how it does that shortly but for now
当您键入一条消息时，您的手机 when you type out a message your phone
检测到一个看起来像这样的模式 detects a pattern that looks like this
向右滑动时，手机会检测到 when you swipe right your phone detects
这个和多点触控变焦看起来像 this and to multi-touch zooms look like
即使你有大手指 this even if you have large fingers your
智能手机可以找到您的中心 smart phone can find the center of your
触摸它可以看到尺寸形状和 touch it can see the size shape and
点击或手势的位置，然后 location of the tap or gesture and then
它计算X＆Y坐标 it calculates the X&Y coordinates it
还可以确定您是否离开了 also determines whether you left your
手指在屏幕上，以及 finger or fingers on the screen and if
你朝任何特定方向刷卡 you swiped in any particular direction
让我们快速回顾一下屏幕 let's quickly review how the screen
在一个路口检测到触摸 detects a touch at one intersection
带负电荷的电子是 electrons with a negative charge are
应用于建造的蓝板 applied to the blue plate which builds
电场并引起正 an electric field and causes positive
费用聚集在黄板上 charges to gather on the yellow plate
当像你这样的导电材料 when a conductive material like your
指尖靠近会打断 fingertip comes close it interrupts the
电场和变化 electric field and the change in
黄板上的正电荷是 positive charge on the yellow plate is
测量你可能想知道如何 measured you might be wondering how does
我的触摸屏通过玻璃工作 my touch screen work through the glass
和屏幕保护贴以及这种类型的 and screen protector well this type of
触摸屏称为投影 touch screen is called a projected
电容式触摸屏，因为 capacitive touch screen because the
电场上升到表面上方 electric field rises above the surface
的玻璃，因此触摸屏将 of the glass so the touch screen will
也可以通过防护罩工作 work through protective covers as well
如薄塑料或橡胶手套测试 as thin plastic or rubber gloves test it
拿出几个塑料袋或萨兰 out grab a few plastic bags or saran
包裹一下，看看有多少层塑料 wrap and see how many layers of plastic
您的触摸屏可以感知 your touchscreen can sense through
在继续之前，我们先简化一下 before we continue let's simplify the
从3200个交叉点到 grid from 3,200 intersections down to
200个交叉路口 200 intersections everything
从概念上讲就是一样 conceptually works the same it's just
更容易可视化 easier to visualize
好的，所以所有行都已充电 okay so with all the rows charged
消极地建立电场 negatively and the electric fields built
向上，色谱柱积极测量 up and the columns actively measuring to
看到电场的变化，我们 see changes in the electric field we
正确的触摸屏不是 have a touchscreen right well not
究竟 exactly
看看我们是否持续测量每个 see if we continuously measure each of
这些列，而所有的行 these columns while all of the rows of
电场很活跃，我们遇到了 electric fields are active we run into a
几个问题说我很好地点击这里，因为 few issues say I tap here well because
整个黄色列都已连接 the entire yellow column is connected it
无法区分是否有 can't distinguish whether there was a
点击这里或这里不是一个好地方 tap here or here this is not a good
触摸屏，我们必须测量 touchscreen we have to measure the
同时整列，因为如果 entire column simultaneously because if
我们分手并测量 we break up the column and measure
最终我们将获得单个钻石 individual diamonds we will end up
测量3200点，那也是 measuring 3200 points and that is too
很多点，那么我们怎么去 many points so then how do we get it to
好好工作 work properly
以及工程师的解决方案 well the solution that engineers
实施是扫描或扫 implemented was to scan or sweep the
沿行的电场非常 electric field along the rows very
以大约10的速度迅速 quickly at a rate of about 10
在任何给定时间每行微秒 microseconds per row at any given time
只有一排在因此 only one row is on thus only one row of
交叉路口可以检测到 intersections can detect a touch at a
智能手机中的时间电路 time circuitry in the smartphone
控制此电扫 controls this sweep of the electric
跨各行的字段 field across each of the rows and at
每行沿着每个测量 every row a measurement along each
列是电之前记录的 column is recorded before the electric
字段移至每列的下一行 field moves to the next row each column
隐蔽其测量智能手机 recessed its measurement the smartphone
然后在行处于活动状态时进行关联 then correlates when the row was active
与输出各列以 with the output each column in order to
重建一个完整的网格 reconstruct a complete grid this
骗局发生在一对夫妇中 scamming happens within a couple
毫秒，它允许 milliseconds and it allows for the
智能手机区分三个 smartphone to distinguish between three
或更多不同的触摸 or more touches in all different
位置的缺点是 locations the drawback is that a new
引入了时间延迟，如果 time delay is introduced and if the
触摸屏太大，无法说明 touchscreen gets too big say the size of
一张小桌子会有一个相当 a small table there would be a rather
扫描明显延迟 noticeable delay from the scanning
跨这么多行，但是 across so many rows however with a
触摸屏，智能手机的大小 touchscreen the size of your smartphone
它可以快速确定所有类型 it can quickly determine all the types
几乎所有的触摸和手势 of touches and gestures that pretty much
总结一下您的多点触控 sums it up for multi-touch in your
手机 smartphone
还有很多其他类型的触摸 there are many other types of touch
屏幕像电阻或自我 screens like resistive or self
电容式触摸屏详细介绍 capacitive touch screens to be detailed
在其他情节中 in other episodes this episode is
与一个结构有关 related to the structure of a
触摸屏以及电子 touchscreen display as well as electric
场电容器以及如何测量 fields capacitors and how to measure
电容谢谢收看 capacitance thanks for watching don't
忘记订阅您的评论 forget to subscribe comment with your
问题和想法，并告诉您 questions and thoughts and tell your
朋友和家人关于你的事情 friends and family about something you
今天学到的 learned today
并记住思考 and to remember to think about
概念上的简单性和结构性 conceptual simplicity and structural
复杂 complexity
[音乐] [Music]