The most important part of a smartphone, from the average person's point of view, is the screen, apart from the battery. Of course, components such as processors and memory are equally important, but users in this era don't care about those things, or they don't understand what mobile phone configuration is, the simplest and most straightforward thing is to look at the screen and battery of the mobile phone.

Whether the battery is durable and whether the screen looks good.

Since you want to make a smartphone, the screen is very important, it must be sturdy, and it must have a good touch experience.

In fact, touch screens are not too new.

The original time and space, the iPhone 4 released by Apple, was really amazing to the world at that time. Because it's really cool, there aren't any buttons, and everything is done on a 3.5-inch touchscreen. The best part is that you can "pinch" the screen with two fingers to resize the window and the picture, just like you really "pinched" it. All these effects are based on the continuous development of touch screen technology.

If the invention of the mouse in 1964 brought computer operation into a new era, then the emergence of the touch screen made the graphical human-computer interaction interface more intuitive and easy to use.

In 1971, Sam Hurst invented the world's first touch sensor. Although this instrument is not the same as the touch screen we see today, it is regarded as the beginning of the development of touch screen technology.

When Sam Hurst was a teacher at Kennedy University, he was so tired of dealing with a lot of graphics data every day that he started figuring out how to work more efficiently and get the damn graphics the easiest way to get them. He converted three basements into workshops, one for wood, one for electronic components, one for assembling the parts, and eventually for the first touchscreens.

This earliest touchscreen was named "AccuTouch" and was assembled by hand, so only a few devices could be produced in a day.

In 1973, this technology was selected as one of the 100 most important new technology products by the journal Industrial Research of the United States. Soon after, SamHurst founded his own company and worked with Siemens AG to continuously refine the technology. During this period, touch screen technology was mainly used by the United States military, and it was not until urst's company exhibited 33 televisions with touch screens installed at a technology exhibition in the United States that ordinary people "touched" the magical touch screen for the first time.

Since then, touchscreen technology has been widely used in public services and personal entertainment devices. People are gradually accustomed to using the "touch" method to buy goods on electronic vending machines, order songs on karaoke machines, and inquire about the information they need in banks, hospitals, libraries, and airports. In 1991, the touch screen officially entered China. In 1996, Huaxia's self-developed touch self-service all-in-one machine was put into production.

In the future, the "digital kiosks" seen in the streets and alleys of the capital will be inseparable from touch screen technology, with which even people who do not know how to use a computer can easily find out "where am I" and "where am I going".

There are many touch screens in the digital kiosk, which is the IRTOUCH infrared touch screen provided by Beijing Huiguan.

However, there are many problems with the touch screen, and there is no good way to solve them at present, or even in the future, the most important point may be the light transmittance.

I still remember the top ten hot technologies and representative products in 2007 selected by Forbes magazine, and the touch screen technology topped the list, and its representative product was the Apple iPhone of that year. So the question is, why do the vast majority of mobile phones and laptops so far not use touchscreens, given that there are so many interesting and useful technologies concentrated in a small touchscreen?

This brings us to an obstacle that touchscreen technology has always been difficult to overcome——— "light transmittance".

When users use mobile phones and laptops, they always want to see more vivid and clear images, which puts forward high requirements for the visual effect of the display. As we all know, the best light transmittance material at present is glass, but when the light passes through, the two surfaces of the glass will reflect 3% of the light respectively, that is, the maximum light transmittance of a single layer of glass is 94%, which makes the light that reaches the human eye is lost.

The most widely used capacitive screen and resistive screen before Zhou Fangyuan's rebirth were covered with several layers of conductive coating on the surface of the glass screen. As you can imagine, their light transmittance is lower than that of simple peeling, and the distortion of the image is more serious. For example, the light transmittance of the usual resistive screen is about 75%, and the light transmittance of the capacitive screen is slightly higher, but it will never reach the 95%-98% claimed by some businesses. These exaggerated claims are based on the light transmittance of infrared rays through the touchscreen, not the light emitted by the images on the display. It is difficult to have both fish and bear's paws, and whether to pursue a more realistic display effect or a more comfortable operation experience is a matter of opinion for users.

But technology is always advancing.

Although there were already many brands of touchscreen phones on the market at the time, an important reason why the iPhone still caused a sensation was that Apple was the first to apply "multi-touch" to mobile phones. In the past, the touch screen of mobile phones mostly used resistive type, and only one position could be sensed at a time. The capacitive touch screen with dedicated software can handle touch commands from multiple fingers at the same time.

In the more distant future, there will be more advanced "force feedback touch screen" into our lives. Many people will complain that although the touch screen is convenient and easy to use, but the fingers are pressed on the cold glass surface, it is not as good as the feel of the traditional keyboard, and the "force feedback touch screen" solves this problem. Simply put, it is to add a vibration function to the touch screen, when the finger touches the screen, it will be vibrated by a reaction force, and it will feel like a real button has been pressed. Although it may seem of little practical significance, it is a great improvement in the user experience.

Now Andy asked Zhou Fangyuan about the screen, and there were two points.

The first is the size of the screen, as we all know, the larger the screen, the higher the power consumption. But in the end, the touch screen still has to be touched, it is necessary to ensure the size of the screen, if the screen is too small, a finger pressed directly occupies a quarter of the screen, then there is no need to touch, how good is the direct button?

Also, even if it is a resistive screen, there are different specifications, what specifications of screen are used? This is also a question.

Yes, the I1 mobile phone of Yuanfang Technology still uses a resistive screen after all. Since the advent of the resistive screen, it has been decades of history, and the development of science and technology in all aspects has kept up. The capacitive screen, which became popular in later generations, does not exist at present, and it will not be developed by LG until 07 years.

So for now, Yuanfang Technology has no capacitive screen available.

And the resistive screen, it itself is divided into different specifications, there are four wires, five wires, seven wires, eight wires, etc., to talk about the difference, in fact, there is not much difference, at most the latter is slightly more durable than the former, more specific, a few lines are just a few signal lines for the touch screen interface. Depending on the number of lines, the scanning principle is a little different. And there is also the problem of patent evasion, which will not be described here.

In addition, due to the operation mode of the resistive screen, the accuracy of the resistive screen will vary depending on the number of outlets, and it will be affected by external forces.

Resistive screens, although currently the only option, are actually not bad. Its advantage is that its screen and control system are relatively cheap, the response sensitivity is very good to the level of pixels, and the maximum resolution can reach 4096x409; Under the influence of water vapor and oil pollution, it can be used in a lower or higher temperature environment, and can adapt to a variety of harsh environments; it can be touched with any object, even with gloves, and can be used for handwriting recognition, with good stability performance.

And then most importantly, the cost of resistive screens is relatively cheap due to mature technology and low threshold.

Of course, if you want to talk about the shortcomings, there are a lot, for example, the outer film of the resistive screen is easy to be scratched, resulting in the unusability of the touch screen, the multi-layer structure will lead to a large light loss, and for handheld devices, it is usually necessary to increase the backlight to make up for the problem of poor light transmission, but this will also increase the consumption of the battery.

Why will capacitive screens become popular in later generations?

It's not unreasonable.

For example, the capacitive screen only needs to be touched, and does not need pressure to generate a signal, and for example, the capacitive screen only needs to be corrected once or not at all after production, while the resistive technology needs to be corrected conventionally, and the capacitive solution has a longer lifespan because the parts in the capacitive touch screen do not need to move, and the upper ITO film in the resistive screen needs to be thin enough to be elastic so that it bends downward to contact the ITO film below. In addition, capacitive technology is superior to resistive technology in terms of light loss and system power consumption.

Of course, the most important thing is that the capacitive screen can support multi-touch technology, and unlike the resistive screen, it is not as responsive as the resistive screen.

For users, a better user experience is the most important, and multi-touch is undoubtedly more convenient and sensitive than single-touch. Combined with the fact that capacitive technology is wear-resistant, has a long service life, and has low maintenance costs for users, the overall operating expenses of the manufacturer can be further reduced. Manufacturers are willing to use, users are willing to use, and it is natural that resistive screens are gradually disappearing in the mobile phone industry.

As for why the resistive screen can't use multi-touch, the reason is actually very simple.

The resistive screen is divided into two layers, separated by an isolator in the middle. When two layers collide with each other, the current will have an effect, and the chip will react by calculating the data between the force and the current, assessing which position of the screen is under pressure. Because resistive screens need the upper and lower layers to collide before they can react. Therefore, when two points are pressed at the same time, the pressure on the screen becomes unbalanced, resulting in touch errors. Therefore, this principle makes it difficult for the resistive screen to achieve multi-touch, even if the multi-touch sensitivity is not easy to adjust through technical means, and the phenomenon of sensitive point A and dull point B often occurs.

And the biggest advantage of capacitive screen is this.

The capacitive screen relies on the electrodes that increase the mutual capacitance, simply put, the screen is divided into blocks, and a group of mutual capacitance modules are set up in each area to work independently, so the capacitive screen can independently detect the touch situation in each area, and after processing, simply realize multi-touch.

The essence of the capacitive screen is a four-layer composite glass screen, the inner surface of the glass screen and the interlayer are each coated with a layer of ITO, the outermost layer is only 0.0015mm thick silica glass protective layer, the interlayer ITO coating is used as the working surface, the four corners lead to four electrodes, and the inner ITO is the screen layer to ensure the working environment. When the user touches the capacitive screen, due to the electric field of the human body, the user's finger and the working surface form a coupling capacitance, because the working surface is connected with a high-frequency signal, so the finger absorbs a very small current, this current flows out from the electrodes on the four corners of the screen respectively, and theoretically the current flowing through the four electrodes is proportional to the distance from the finger to the four corners, and the controller obtains the position through the precise calculation of the four current proportions. It can achieve 99% accuracy and has a response speed of less than 3ms.

This is the principle of capacitive screen, which is completely different from resistive screen, you can't say which one is better, but for products like mobile phones, there is no doubt that capacitive screens are better to use.

However, at present, Zhou Fangyuan has no choice, so the only mobile phone of the I series is bound to use a resistive screen at present.

"The size is 4 inches, it's good, the specifications are mainly four-line, you can also add the advanced version, use the five-line screen. ”

Zhou Fangyuan said.

The size has been verified by countless mobile phone manufacturers and users in the previous life, and if it is smaller, 3.5 inches is also acceptable, but it is not interesting to be smaller, and the smartphone is playing with a touch, and the screen is too small The experience will deteriorate.

As for the larger screen,It's not that it can't be done,But there are two considerations,On the one hand, before the appearance of the capacitive screen,Rely on the screen size to update,Constantly provide new products,Absorb gold while ensuring the popularity of the brand;On the other hand,Too huge screen,It is also a challenge for the safety of the screen,After all, the resistive screen needs to be pressed to produce an effect,It is still different from the capacitive screen。 If it's a capacitive screen, five inches, or even eight inches, the resistive screen is troublesome, so a large screen, the loss will be very drastic, and one is not good enough to cause multi-point touch, and the sensitivity will be reduced, but it is better to focus on a slightly smaller screen to ensure the user experience as much as possible.

"By the way, Andy, I think you can try to get a new touchscreen, the kind of ...... that can be multi-touched."

Since I know the principle of the capacitive screen, although I don't fully understand it, a lot of knowledge in it is a layman, but the general principle can be provided. Andy, these people, the level is absolutely enough, maybe they are poor in production and manufacturing, but the scientific research ability is not bad, provide advice, provide funds for them to do experiments, and it is not too difficult to make a capacitive screen, when the time comes, directly preemptively register the patent, buy a screen manufacturing plant or invest in one, no matter how bad it is, authorized production is also a large amount of money, since there is this opportunity, why cheap LG?

Anyway, I've already robbed so many things, and it's not bad for this one.

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