Many of us are using mobile phones now and most people use smart phones. So, have you paid attention to what screens are used on your mobile phone screen? In fact, the two most popular now are capacitive screens and resistive screens. What is the difference between a capacitive screen and a resistive screen?
Capacitive screen
The capacitive touch screen can be simply viewed as a screen composed of a four-layer composite screen: the outermost layer is a glass protective layer, followed by a conductive layer, the third layer is a non-conductive glass screen, and the innermost fourth layer It is also a conductive layer. The innermost conductive layer is a shielding layer, which acts to shield the internal electrical signal. The middle conductive layer is a key part of the entire touch screen, and there are direct leads on the four corners or four sides, which are responsible for detecting the position of the touch point.
Resistive screen
Commonly known as "soft screen", mostly used in Windows Mobile system phones; capacitive touch screen commonly known as "hard screen", such as iPhone and G1 machines use this screen quality.
Resistance touch screen and capacitive touch screen comparison
First, indoor visual effects
Both are usually good.
Second, touch sensitivity
1. Resistive touch screen: It is necessary to use pressure to make contact with each layer of the screen. You can use your fingers (even with gloves), nails, stylus, etc. to operate. Support for stylus is important in the Asian market, where gestures and text recognition are valued.
2, capacitive touch screen: the most subtle contact from the surface of the charged finger can also activate the capacitive sensing system at the bottom of the screen. Non-living objects, nails, and gloves are invalid. Handwriting recognition is more difficult.
Third, the accuracy
1, the resistance touch screen: the accuracy of at least a single display pixel, can be seen with the stylus. It is easy to recognize by hand and helps to operate under the interface of small control elements.
2, capacitive touch screen: theoretical accuracy can reach several pixels, but in fact will be limited by the finger contact area. It is difficult for the user to accurately click on a target of less than 1 cm 2 .
Fourth, the cost
1, the resistance touch screen: very low.
2, capacitive touch screen: different manufacturers of capacitive screen price is 10% to 50% more expensive than the resistance screen. This extra cost doesn't matter to the flagship product, but it may discourage mid-priced phones.
Five, multi-touch feasibility
1. Resistive touch screen: Impossible unless the resilience screen is connected to the machine's circuit.
2, capacitive touch screen: depending on the implementation and software, has been implemented in the G1 technical demonstration and iPhone. The 1.7T version of the G1 is already capable of implementing the multi-touch feature of the browser.
Sixth, damage resistance
1. Resistive touch screen: The fundamental characteristics of the resistive screen determine that the top of the resistive screen is soft and needs to be able to be pressed. This makes the screen very susceptible to scratches. Resistive screens require a protective film and relatively more frequent calibration. An advantageous aspect is that the resistive touch screen device using the plastic layer is generally less susceptible to damage and less prone to breakage.
2, capacitive touch screen: the outer layer can use glass. Although it is not indestructible, and it may break under severe impact, the glass should be better for daily rubbing and smudges.
Seven, clean
1. Resistive touch screen: Since it can be operated with a stylus or nail, it is not easy to leave fingerprints, grease and bacteria on the screen.
2, capacitive touch screen: to use the entire finger to touch, but the outer layer of glass is easier to clean.
Eight, environmental adaptability
1, resistance touch screen: the specific value is not known. However, there is evidence that the Nokia 5800 with a resistive screen can operate at temperatures between -15 ° C and +45 ° C without any humidity requirements.
2, capacitive touch screen: Typical operating temperature between 0 ° and 35 °, requires at least 5% humidity (limited by the working principle).
Nine, the visual effect under the sun
1. Resistive touch screen: Usually bad, the extra screen level reflects a lot of sunlight.
working principle
Resistive touch screen: composed of multiple layers of transparent conductive plates, two transparent metal conductive layers for identifying touch signals can recognize pressure signals from stylus, nails, and any hard objects; normally two transparent metal conductive layers In a state of mutual insulation, when a hard object such as a stylus touches the surface of the screen, the first layer of the metal conductive layer is deformed to be in contact with the second layer of the metal conductive layer, and a path is formed between the two layers of the metal conductive layer, There is resistance between the two metal conductive layers, and a constant voltage (5V) is depressurized when flowing between the two metal conductive layers. According to this characteristic, the touch screen circuit can be converted by the voltage after being stepped down. Which coordinates the pressure comes from to achieve the positioning of the touch screen;
Capacitive touch screen: The human body, the tip of the finger touching the screen and the surface of the screen naturally form a coupling capacitor. The coupling capacitor can effectively transmit the high-frequency current signal from the body, and utilize the characteristics of the bio-current to distribute the electrodes at the four corners of the screen. It can receive the high-frequency current signal from the human body that is transmitted through the fingertips of the finger. Because of the difference in the position of the contacts, the currents received by the electrodes at the four corners are also different. The comparison can also be used to obtain the touch point. Coordinates to achieve screen positioning
Precision and sensitivity
Resistive screen: Compared with the capacitive screen, the accuracy of the resistive screen is much higher. The two layers of transparent metal conductive layers need to form a path to generate current. Only the pressure from a very small pixel is needed, so the screen position of the resistive screen is very high. Accurate, even accurate to one of the pixels on the screen; but the resistance screen positioning requires sufficient pressure to achieve, so uneven touch screen may lead to recognition interruption, compared to the capacitive screen sensitivity is much worse;
Capacitive screen: Since the biocurrent is distributed on the top surface of the finger, the input current is not fixed at a certain point, but on one side, causing the capacitive screen to occupy several pixels at the input, while the finger and the screen do not need to be completely Contact can form a current path, so it is easy for the screen positioning to float, and the capacitive screen is not dominant in accuracy; but due to the human body bio-current sensing principle, we only need to touch the tip of the finger to the surface of the screen. The signal is transmitted to the screen to achieve signal transmission, so the sensitivity is higher than the resistance screen;
user experience
Resistive screen: The resistance screen calculates the screen coordinate point by means of voltage drop. This characteristic determines that it cannot calculate the coordinates of different pressure points at the same time, which results in the resistance screen not supporting multiple points at the same time;
Capacitive screen: Its current distributed input characteristic can perfectly receive signals from different screen coordinate points. It can be said that multiple touches at the same time are a highlight of the capacitive screen. Now, more and more software programs have developed more points. The new touch function, the multi-touch technology of the capacitive screen for the user experience really raises the user experience to a new level;
Cost and maintenance
Resistive screen: The development of resistive screens today, due to the maturity of its technology, the improvement of equipment and the readily available raw materials, make the resistance screen very low in cost; since the early mobile phone screen and notebook screen use resistive screen as the input carrier, the market The occupancy rate is very large, so it is easy to find related repair parts on the market, so that the resistance screen appears to have an advantage in maintenance;
Capacitive screen: The production cost of capacitive screen is generally 10% to 50% higher than that of resistive screen. Early capacitive screens are mainly used on high-end products of Apple and Google. These products are typical flagship products, and consumers are also easy to accept. However, in the low-end and mid-end products market, capacitive screens are often discouraged by many consumers because of their high cost;
Capacitive screen contrast resistance screen who is better
For the capacitive screen and the resistive screen, which is good, the conclusion is as follows:
Capacitive screen is more sensitive Nowadays, high-end mobile phones use this capacitive screen. The principle is that the finger contact forms a capacitance with the screen, and the capacitance between the finger and the screen changes to obtain the touch information. The feature is that the screen is hard screen, sensitive to touch, no need to press the screen hard, support multi-touch, but can only be touched with a finger. The representative is that lg's chocolate is red at the touch (key-type capacitive touch), Meizu's m8, iphone, Nokia x6, G1, G2, G3. The general principle of the resistive screen is that the finger presses the screen, and the distance between the two screens changes, resulting in The screen resistance value changes to obtain touch information. The feature is that the screen is a soft screen. It has a slight depression when pressed. It needs to be touched with a little force. Any stylus can be used, but multi-touch is not supported. Represents the entire window mobile series, 5800 and other cheaper Saipan touch phones.
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