What is the difference between ips touch screen and capacitive touch screen ?

Capacitive touch screen is the name of design for the touch screen. In fact, IPS is not a material, on the contrary, It is a technical name. Its essence is super TFT. In another word, IPS screen is also a kind of TFT screen.

But which one is better ? without a doubt, the screen using IPS technology is much better. The IPS screen alters the arrangement of TFT liquid crystal molecules (the liquid crystal molecules of ordinary TFTs are arranged horizontally, and the liquid crystal molecules of IPS are vertically arranged), so that it can deliver you a larger viewing angle, and the water ripple( also known as the hard screen) is not apparently to be observed when pressed.

Besides, IPS technology also features preferable color reproduction and high verisimilitude.

What is the difference between a capacitive touch screen and an infrared touch screen?

Generally speaking, the difference is that the infrared touch screen has grooves, it is sensitive to glare, also thicker and heavier, but the price is much cheaper. While the capacitive screen machine is more beautiful, attractive, lighter and thinner, and is purely flat and easy to implement.

1. Infrared touch screen

The infrared technology touch screen is composed of infrared emitting and receiving sensing elements mounted on the outer frame of the touch screen.

The infrared detecting net is generated on the surface of the screen.Any touch object can alter the infrared rays on the touch spot to complete the touch screen operation. The infrared touch screen is implemented in a similar way to surface acoustic wave touch, using infrared emitting and receiving sensing components.

An infrared detection net was generated on the surface of the screen by those components. The object of touch operation such as fingers can alter the infrared rays of the touch spot, it will be converted into a coordinate position of the touch spot to complete the operational response.On the infrared touch screen,there are infrared transmitting tubes and infrared receiving tubes which were inlayed on the four sides of the circuit board devices, which corresponding to forming an infrared matrix intersecting horizontally and vertically.

2. Capacitive touch screen

A capacitive touch screen is a layer of transparent special metal conductive material attached to the surface of the glass. When the finger touches the metal layer, the capacitance of the contact changes, so that the frequency of the oscillator connected to it changes, and the the touch spot can be determined by measuring the frequency change. Since the capacitance varies with temperature, humidity, or grounding conditions, its stability is poor, and drift often occurs.

Additional information:

The features of the infrared touch screen are:

  1. High stability, which will not drift due to changes in time and environment; high adaptability, free from interference of current, voltage and static,it is suitable for some harsh environmental conditions (explosion-proof, dust-proof); High light transmission without intermediate medium, up to 100% standard;
  2. Long life span, high durability, scratch resistance, long touch life; good performance, sensitive to touch pressure, no special requirements for the body of touch; supporting simulation 2 points under XP, support in WIN7 2 points; support USB, serial output; resolution is 4096 (W) * 4096 (D); operating system compatibility.

Features of the capacitive touch screen features are:

  1. A thin electrode is plated on all four sides of the touch screen to form a low voltage alternating electric field in the conductive body. When the screen is touched, a coupling capacitor is formed between the finger and the conductor layer, due to the electric field of the human body.And the current from the four electrodes flows to the contact, and the current intensity is proportional to the distance from the finger to the electrode, and the controller located behind the touch screen is The ratio and strength of the current are calculated, and the touch spot is accurately calculated.
  2. Capacitive touch screen double glass can not only protect the conductor and sensor, but also can prevent external environmental factors from affecting the touch screen effectively. Even if the screen is stained with dirt, dust or oil, the capacitive touch screen can still calculate accurately the touch spot.

What is the difference between capacitive touch screen and resistive touch screen ?

  1. Touch sensitivity.

Resistive touch screen: Pressure is required to enable each layer of the screen touch. You can use your fingers (even with gloves), nails, stylus, etc. It is very important to support stylus in Asian market, where gestures and text recognition are preferred.

Capacitive touch screen: The finest contact come from the surface of a charged finger also activates the capacitive sensing system at the bottom of the screen. Inanimate objects, nails, and gloves are not valid. Handwriting recognition is more difficult to access.

  1. Accuracy.

Resistive touch screen: The minimum accuracy is a single display pixel, which can be identify with the stylus. It is easy to distinguish by hand writing ,also the reistive touch screen is helpful to operate under the interface of small control elements.

Capacitive touch screen: The theoretical accuracy can reach several pixels, but it is actually limited by the finger contact area. It is difficult for the user to accurately click on a target of less than 1 cm2 .

  1. Cost.

Resistive touch screen:  very low cost.

Capacitive touch screen: the price of capacitive screens from different manufacturers is 10% to 50% higher than that of resistive screens. This extra cost is trivial to the flagship models, but it may discourage phone models of middle price level.

  1. Damage resistance

Resistive touch screen: Due to fundamental features of the material ,the top section is soft ,which enable it can be pressed down. This makes the screen easy to be scratched. A protective film and relatively more frequent calibration is required for resistive screens. The advantage is that the resistive touch screen is wearing resistance and less prone to breakage, and the resistive touch screen device using the plastic layer is generally less susceptible to damage and less prone to breakage.

Capacitive touch screen: The outer layer can be made ofglass. Although it is not indestructible, and it may break under severe impact, but for darly friction and smudges, glass is much better.

What are the main applications of capacitive touch screens ?

The working theory of capacitive touch screen technology is by ultimizing the current sensing of the human body.

There are mainly two kinds of capacitive trouch screens,they are surface capacitive screen and projected capacitive screen (inductive capacitive screen).

Projected capacitive screens which featuring the high light transmittance, fast response speed and long life span etc are used in wide range.

The capacitive touch screens are mainly used in cash register capacitive screen, self-service ordering machine, self-service inquiry machine, self-service queue machine, self-service terminal equipment, industrial control, some industrial control equipment, etc.