Capacity Touch Panel(CTP) is the current induction to make use of the work. Capacitive touch screen is a 4 layer compound glass screen, the inner surface of the glass screen and sandwich each ITO, coated with a thin layer of the outermost is silicon soil, sandwich glass protective mining ITO coating as four angles on lead, four electrodes, lining for shielding layer ITO to ensure good working environment.
In chemistry Indium Tin ITO is Oxides, the abbreviations. As of indium tin oxide nanoparticles, has the very good conductivity and transparency, can cut harmful ultraviolet radiation, the electronic and far infrared ray. Therefore, indium tin oxide usually spraying in glass, plastic and electronic screen, used as transparent conductive film, while reducing harmful to human body electronic radiation and ultraviolet and infrared.
When a finger touch in metal layer, because the electric field, the user and touch screen with a surface formation coupling capacitance, for high frequency current speaking, capacitance is directly conductor, so fingers from the contact point sucked a small current. The current points from the four corners of the touch screen electrode, and comes out of the current flows through the four electrode with finger is proportional to the four corners, the distance of the four current controller through the precise calculation indicates that percentage point of touch.
Capacitive touch screen defects
Capacitive touch screen light transmittance and clarity than four lines, of course also cannot resistance screen and surface acoustic screen compared with five line resistance screen. Capacitive screen, capacitance, and reflective serious four layer compound touch screen technology for each wavelength of light transmittance of light color fidelity uneven, the problems existing in each layer, because the light reflected between, also caused the image of fuzzy characters.
Capacitance screen on the human body in principle as a capacitor components, when an electrode using a conductor working with interlining between ITO near enough capacitance coupled out when the current is enough, says the misoperation cause capacitance screen. We know, capacitance value is inversely proportional to the distance with JiJian though, but with relative area, and also is proportional to the related with the medium insulation coefficient. Therefore, when the larger area of the palm or hand-held conductor things near the capacitance screen not touch it can cause capacitance screen when the misoperation, in wet weather, this kind of situation is particularly serious, ahold of displays, palm within 7 cm near display near the display 15 centimeters or body can cause capacitance screen within the misoperation.
Capacitive screen with another drawback of a gloved hand or handheld nonconductive object no reaction, the touch because of increased more insulation medium.
Capacitive screen more major drawback is drift: when environment temperature, humidity changes, environmental electric field change, can cause capacitance screen the drift, cause is not accurate.
The touch screen most outside capacitance silicon soil protection glass prevent scratching sex is very good, but fear your nails or abvance percussive, knock a small hole will hurt interlining, whether injury and interlining ITO ITO or install inside surface transportation process slander and ITO layer, capacitive screen can't work properly.
principle
When users touch screen, because the capacitance electric field, and the user fingers and face form a coupling capacitors, because work surface, and then there are the high frequency signal absorption walk a small fingers, the current current respectively from the four corners of the screen on the issue, and theoretically electrode with the current flows through four electrode distance of four fingers to proportional to the four current, controller through proportion of the precision calculated, position.
Main characteristics
material
Completely prevent blow glass material (mok's hardness 7H), are less vulnerable to spikes scratch and wear, not affected by common sources of influence, as water, fire, and radiation, electrostatic, dust or grease, etc. The eyecare functions concurrently goggles.
sensitivity
Less than two ounces of force of induction, less than can be fast response 3ms.
accuracy
99% accuracy.
clarity
Three kinds of surface treatment (Industrial) Etch, Polish, choices. SMT controller 572,600 hours (MTBF than every MILHANDBOOK - 217 - F1).
Touch life
Any can withstand more than 5,000 million times, once the touch of correction cursor not sliced.
When a finger touch in metal layer, because the electric field, the user and touch screen with a surface formation coupling capacitance, for high frequency current speaking, capacitance is directly conductor, so fingers from the contact point sucked a small current. The current points from the four corners of the touch screen electrode, and comes out of the current flows through the four electrode with finger is proportional to the four corners, the distance of the four current controller through the precise calculation indicates that percentage point of touch.
Capacitive touch screen defects
Capacitive touch screen light transmittance and clarity than four lines, of course also cannot resistance screen and surface acoustic screen compared with five line resistance screen. Capacitive screen, capacitance, and reflective serious four layer compound touch screen technology for each wavelength of light transmittance of light color fidelity uneven, the problems existing in each layer, because the light reflected between, also caused the image of fuzzy characters.
Capacitance screen on the human body in principle as a capacitor components, when an electrode using a conductor working with interlining between ITO near enough capacitance coupled out when the current is enough, says the misoperation cause capacitance screen. We know, capacitance value is inversely proportional to the distance with JiJian though, but with relative area, and also is proportional to the related with the medium insulation coefficient. Therefore, when the larger area of the palm or hand-held conductor things near the capacitance screen not touch it can cause capacitance screen when the misoperation, in wet weather, this kind of situation is particularly serious, ahold of displays, palm within 7 cm near display near the display 15 centimeters or body can cause capacitance screen within the misoperation.
Capacitive screen with another drawback of a gloved hand or handheld nonconductive object no reaction, the touch because of increased more insulation medium.
Capacitive screen more major drawback is drift: when environment temperature, humidity changes, environmental electric field change, can cause capacitance screen the drift, cause is not accurate.
The touch screen most outside capacitance silicon soil protection glass prevent scratching sex is very good, but fear your nails or abvance percussive, knock a small hole will hurt interlining, whether injury and interlining ITO ITO or install inside surface transportation process slander and ITO layer, capacitive screen can't work properly.
principle
When users touch screen, because the capacitance electric field, and the user fingers and face form a coupling capacitors, because work surface, and then there are the high frequency signal absorption walk a small fingers, the current current respectively from the four corners of the screen on the issue, and theoretically electrode with the current flows through four electrode distance of four fingers to proportional to the four current, controller through proportion of the precision calculated, position.
Main characteristics
material
Completely prevent blow glass material (mok's hardness 7H), are less vulnerable to spikes scratch and wear, not affected by common sources of influence, as water, fire, and radiation, electrostatic, dust or grease, etc. The eyecare functions concurrently goggles.
sensitivity
Less than two ounces of force of induction, less than can be fast response 3ms.
accuracy
99% accuracy.
clarity
Three kinds of surface treatment (Industrial) Etch, Polish, choices. SMT controller 572,600 hours (MTBF than every MILHANDBOOK - 217 - F1).
Touch life
Any can withstand more than 5,000 million times, once the touch of correction cursor not sliced.
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