Capacitive - Touchscreen

MECHANICAL
Construction

Glass substrate with uniform conductive coating

( Thickness：1.1mm，1.6mm，1.8mm，2.5mm，2.8mm )
Connection Tail FFC ( FPC optional )，crimpflex connector
Input Method Finger activation
Activation Force ≦ 10g
Available Size 5.7”~ 21"
( we also make panels with customized aspect ratio )


ELECTRICAL
Operation Voltage 5V ( DC )
Loop Resistance 100~1000 Ω
Linearity Standard deviation error≦1.5% or ≦1.0% under request
Insulation Resistance ≧ 20 MΩ/25V( DC )
OPTICAL
Transmittanc ≧90 %, light transmission at 550nm
Haze Clear Finish ≦ 5% or Antiglare Finish ( gloss=100 )
ENVIRONMENTAL
Operation Temperature -20℃~+70℃ ( 20%RH~85%RH )
Storage Temperature -40℃~+90℃ ( 10%RH~90%RH )

Constant

Temperature/Humidity		 70℃/90%RH for 500hrs
Thermal Cycle -40℃~+90℃ ( 60min./cycle ) * ( 100 cycles)
Agency Approvals RoHS/CE/FCC
DURABILITY
Surface Hardness ≧ 7H ( JIS 5400 )
Life Time Operationally tested to 200 million touches in one location without failure
Warranty 3-year warranty

 

 

 

Capacitive Panel Specifications

Commercial
Linearity ≦ 1.5%
Insulation Resistance ≧ 20MΩ/25V(DC)
Life Time 200 million touches
Operation Temperature -20 °C ~ +70 °C
Storage Temperature -40°C ~ +90  °C
Constant Temperature/Humidity 70°C /90%RH, 500 hrs
High Temperature 70°C /500 hrs
Low T, emperature -40°C /500 hrs
Thermal Cycle -40°C ~70 ℃ (60 min./cycle) *100 cycles
Connection Tail FFC
Surface Hardness ≧ 7H
Activation Force ≦ 10g Finger
Structure Glass
Transmittance ≧ 90± 2%，AR coating finished  (measured by BYK-Gardner)
Haze Clear Finish ≦ 5% Antiglare Finish (gloss=100)

Capacitive - technology

 

 

Capacitive touch panel

Capacitive touch panel consists of multilayer coatings on a glass panel. The layered structure is shown in figure 2. Transparent conductive coatings are coated on both sides of the glass panel. Specially designed electrodes are laid around the panel’s edge on top of the front-side conductive coating to evenly distribute a low voltage across the front-side conductive coating, creating a uniform electric field. The backside conductive coating is used for electromagnetic interference (EMI) shielding. A hard coat layer is laid on top of the front-side conductive coating to provide protection to the front-side conductive coating. The layered structure is optimized to provide extraordinary optical quality and durability.

A finger touch draws a minute amount of current from the point of contact and creates an interruption of current flow through the electrode corners.

Fig. 2
Touch Controller

The controller measures the values of the current flow from the four corners and calculates the X, and Y coordinates of the touch location. The raw coordination data is further analyzed and compensated to give the optimized linearity accuracy. The controller utilizes its multi-point linearity compensation function to compensate non-uniformity of the panel. Each panel is calibrated in factory. Its compensation data is stored in EEPROM of the controller in pair with the panel and is used for linearity compensation. The compensated coordinates is then transmitted to the host computer through RS232 or USB interfaces.