Features of capacitive touch and resistive touch cash register

consult:

Hello, I bought your machine, it feels that the buttons are not sensitive, and the touch screen of my mobile phone is not sensitive

Professional answer:
Yes, you bought our resistive touch screen cash register. Mobile phones and tablets are basically capacitive screens, and their characteristics are different

Let’s first talk about what is capacitive screen?

Features of capacitive screen:

Capacitive touch screen technology uses the current induction of the human body to wor

Advantages of capacitor bottle:

Capacitive touch screens only need touch, not pressure to generate signals. So it feels sensitive
Capacitive touch screens require only one or no calibration after production, while resistive technology requires conventional calibration.
Disadvantages of capacitor bottle
The capacitive screen has serious reflections, and the reflection of light between the layers also causes the image characters to be blurred.

Current: In principle, the capacitive screen uses the human body as an electrode of a capacitor element. When a conductor is close to the working surface of the interlayer ITO and a capacitor of sufficient capacitance is coupled, the current flowing away is enough to cause the capacitive screen Misoperation.

High environmental requirements: mobile phones and tablets are all powered by rechargeable batteries, that is, direct current. But as a cash register, it is plugged in, that is, alternating current. If the voltage is unstable, there is a problem with the power supply, such as the power supply has no ground wire, etc. Will fail

Drift: The main disadvantage of the capacitive screen is drift: when the ambient temperature and humidity change, and the environmental electric field changes, it will cause the capacitive screen to drift and cause inaccuracy. For example, the temperature of the display will drift after power-on: the user touches the screen while the other hand or one side of the body is close to the display; larger objects near the capacitive touch screen will drift after being moved, and if someone comes around to watch when the user touches the screen It can also cause drift; the reason for the drift of the capacitive screen is due to technical inadequacy

Let’s talk about what is resistive screen?

Features of resistive screen:

Resistive touch screen is a kind of sensor. When touched, it is sent to the processor through the conversion circuit, and converted into the X and Y values ​​on the screen through calculation, and the click action is completed and displayed on the screen
Poor moisture resistance: Humidity, especially heat and environment, can cause touch failure (after a period of use). For example, the noodle restaurant is close to the noodle cooking pot, and the steamed bun shop is close to the steaming pot in an environment with high moisture.

Advantages of resistive screen:

The resistive touch screen has high accuracy, which can reach the level of pixels.
The screen is not affected by dust, moisture and oil, and can be used in a lower or higher temperature environment.
The resistive touch screen uses pressure sensitivity, which can be touched with any object, even with gloves, and can be used for handwriting recognition. In particular, you will find that most cashiers are used to clicking with their nails

Disadvantages of resistive screen：

Multi-point touch is not ideal, and the error rate is high.
It feels less sensitive than capacitive touch screens (the reason is written above)
Resistive touch screens are afraid of damage to the touch part of the screen due to scratches from hard objects.
In summary, the general environment where touch screen cash registers are used is semi-outdoor, and the operation of the cash registers does not require multi-touch and swipes. Therefore, most of them use resistive screens. At present, some cash registers assembled with tablet computers are Capacitive screen. There is no way. After all, the manufacturers that produce this touch screen cash register are not professional, most of them are software vendors and have no technical development capabilities.

consult:
Oh, I see. So what kind of touch screen do famous chain stores such as McDonald’s, KFC, and Starbucks use?

Professional answer:
McDonald’s uses a touch screen cash register from PAR in the United States, excluding cash drawers and printers, and the price is about 2W yuan, resistive screen
A small number of KFC uses NCR, most of them use IBM’s touch screen cash register, excluding cash drawers and printers, the price is about 14-16 thousand yuan, resistive screen
Starbucks uses a MICROS touch screen cash register, which is actually OEM by its partner in Taiwan. The price is 12,000-14,000 yuan, or a resistive screen.

consult:
That’s it. I have gained knowledge

Professional answer:
Yes, the first thing to buy a touch screen cash register is safety, stability and speed
Safety and stability are two aspects of structure and touch. Embedded structure + resistive screen will be safe
Shortcut is not a problem of the sensitivity of touch buttons, it is a problem of how many buttons are used to achieve a sales operation, and the fewer buttons, the faster. This is a problem in programming.

consult:
I think so too

Professional answer:
In addition, you see touch screen cash registers with capacitive screens, which are basically modified from tablet computers. This is also one of the important signs! !