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Capacitive Touch Screen vs Resistive, Which You Prefer

Capacitive Touch Screen vs Resistive, Which You Prefer

October 09 , 2023 0

The Structure And Principle Of Touch Screen

Capacitive Touchscreen

Capacitive touch screens are expected to contain X and Y electrodes with an insulating layer between them. Transparent electrodes are usually made in a diamond pattern with ITO and metal bridges.

The human body is electrically conductive because it contains water. Projected capacitive technology utilises the conductivity of the human body. When a bare finger touches a sensor with an X and Y electrode pattern, capacitive coupling occurs between the human finger and the electrode, resulting in a change in the electrostatic capacitance between the X and Y electrodes. The touch screen controller detects the electrostatic field change and position.

Resistive Touch Screen

A resistive touch screen consists of a glass substrate as the bottom layer and a film substrate (usually transparent polycarbonate or PET) as the top layer, each coated with a transparent conductive layer (ITO: Indium Tin Oxide), separated by spacer points to make a small air gap. The two layers of conductive material (ITO) face each other. When the user touches a part of the screen with a finger or stylus, the thin layers of conductive ITO come into contact. This changes the electrical resistance. The RTP controller detects the change and calculates the touch position. The point of contact is detected by this change in voltage.

Difference Between Capacitive Touch Screen And Resistive Touch Screen In Terms Of Touch Sensitivity

Resistive screen: known as resistive touch screen, commonly known as "soft screen". Structurally divided into three layers, the inner layer is glass, the outer layer is film. ITO (steel oxide tin) coated in the film and glass on the adjacent surface. Resistive screens can be divided into four-wire, five-wire, seven-wire or eight-wire touch screen. The difference between these categories is the difference in generating the screen bias voltage. Resistive touch screen in the all-in-one touch machine application, due to its one-touch technology principle, so that the machine touch higher precision. At the same time, in terms of pixel configuration, it can support HDMI 4K video transcoding, higher display effect.
Working principle:Simply put, the resistive screen is actually a sensor. When the resistive screen is operated, the electric current generates an impact when the film and glass collide with each other. The chip evaluates which part of the screen is being pressed and responds according to the calculated data between the force and the current. Just because the resistive screen is forced to touch, the original yo-yo resource network tube causes the resistive screen can only touch a point, it is difficult to achieve multi-touch. This principle also makes the resistive screen is mostly used for dusty, large temperature differences, with gloves of the harsh industrial scenes

Capacitive screen: all known as capacitive touch screen, commonly known as "hard screen", it is a four-layer composite glass screen, one layer of ITO to ensure that the working environment, the second layer of glass, the third layer of ITO coating for the work surface; the fourth layer is a protective layer of quartz glass. As we all know, the main feature of capacitive touch screen is that it can achieve multi-touch.
Working Principle:Capacitive screen actually works by human current sensing, which can be understood as requiring bioelectricity to contact the touch medium. In other words, capacitive screens use the lower layer to transmit signals to the upper layer. When the upper layer is in contact with the conductor, the lower layer can quickly receive information and make calculations. Determine where the finger is touching and respond. Because of this, capacitive screens can not only support multiple points at the same time, but also greatly improve the sensitivity of hand touch. So capacitive screens are mostly used in normal industrial application scenarios without special requirements.

Resistive Touch Screen And Capacitive Touch Screen Advantages And Disadvantages

Comparison Between Touch Sensitivity

Resistive Touch Screen:

Requires pressure to make contact with all layers of the screen. Can be operated with fingers (even gloves), fingernails, stylus, etc. In the Asian market, stylus support is very important, and the gesture and character recognition division is valued.
Capacitive touch screen:

The slightest contact with the surface of a charged finger can activate the capacitive sensing system at the bottom of the screen. Invalid for non-living bodies, fingernails, gloves. Handwriting recognition is difficult

Comparison Between Touch Accuracy

Resistive Touch ScreenCapacitive Touch Screen:Theoretical accuracy can reach several pixels, but in practice it is limited by the finger contact area. Therefore, it is difficult for users to accurately click on targets below 1cm2

Comparison In Terms Of Price

Resistive touchscreens are cheaper compared to capacitive touchscreens. Thinking through the manufacturer capacitive touch screen price than the resistive touch screen price is about 10-50% higher, the size of this gap on the high-end products does not have a great impact on the lower cost of the product will have a certain extent of the

Comparison Between Suitable Working Environments

Resistive touch screen:The exact value is unknown. However, there is evidence that the Nokia 5800 with a resistive screen can operate at temperatures from -15°C to 45°C and has no humidity requirements.
. Capacitive touch screen

Resistive touchscreens: usually very poor, the extra screen layer reflects a lot of sunlight

Capacitive touch screen works by human current sensing. Capacitive touch screen is a four-layer composite glass screen. The inner surface and interlayer of the glass screen is coated with ITO (coated conductive glass), and the outermost layer is a thin protective layer of quartz glass. The working surface is coated with indium tin oxide and four electrodes lead from the four corners. The inner ITO layer serves as a shield to ensure a good working environment when the fingers touch the metal layer.

The electric field between the human body, the user and the surface of the touch screen forms a coupling capacitance. For high-frequency currents, the capacitance is a direct conductor, so the finger absorbs a very small current from the contact point. The current flows from the electrodes at the four corners of the touch screen, and the current flowing through the four electrodes is proportional to the distance from the finger to the four corners. The controller compares the ratio of the four currents

Nowadays capacitive screen is used a little more, because it has the advantages of accurate point position and easy to support multi-touch. But at the same time it is delicate and needs to be taken care of.