Applications. Technologies. Resistive. Capacitive. Optical. Surface wave
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- Barnaby Montgomery
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1 Touch
2 Technologies Resistive Capacitive Optical Surface wave 2 tj
3 Resistive Touch 4 wire 2 layers of resistive material 1 with connections at top/bottom 1 with connections at sides Separated by air/spacers Src: ELO Src: Analog Devices 3 tj
4 Resistive Touch 4 wire Measure Y position Place a voltage across Y terminals Where touched, X+ terminal will measure relative voltage Measure X position X- Place a voltage across X terminals Where touched, Y+ terminal will measure relative voltage Src: Analog Devices 4 tj
5 Resistive Touch 4 wire Src: Analog Devices 5 tj
6 Resistive Touch 4 wire Src: Analog Devices 6 tj
7 Resistive Touch 4 wire Pro Con Flexible screen material Any material can be used for touch Can be very accurate Surface easy to damage Low endurance Limited light transmission SINGLE TOUCH 7 tj
8 Resistive Touch 5 wire 1 layer of resistive material 1 with connections at 4 corners 1 layer of conductive material Separated by air/spacers Src: ELO Src: ewinsonic 8 tj
9 Resistive Touch 5 wire Measure Y position LR gnd, UL - Vdd LL gnd, UR Vdd Where touched, wiper terminal will measure relative voltage Measure X position LR gnd, UL - Vdd LL Vdd, UR gnd Where touched, wiper terminal will measure relative voltage Src: TI 9 tj
10 Resistive Touch 5 wire Src: TI 10 tj
11 Resistive Touch 5 wire Pro Con Flexible screen material Any material can be used for touch Can be very accurate Surface easy to damage Better but still limited endurance Better light transmission SINGLE TOUCH 11 tj
12 Surface Capacitive Uniform conductive material On glass Common voltage applied at all 4 corners uniform electric field When touched, finger modifies the field (creates a capacitor) current from each corner Calculate position based on relative current values 1/r 12 tj
13 Surface Capacitive Setup a sine wave on all 4 corners i = C dv/dt When touched, finger modifies C Δi Calculate position based on relative current values 1/r 13 tj
14 Surface Capacitive Src: Information Display 14 tj
15 Projected Capacitive Self Capacitance Src: Design News 15 tj
16 Projected Capacitive Self Capacitance Src: Design News 16 tj
17 Projected Capacitive Self Capacitance 17 tj
18 Projected Capacitive Self Capacitance Single Touch only Src: Stanford 18 tj
19 Projected Capacitive Self Capacitance With SW can do 2 touch swipes (pinch, expand) Src: Stanford 19 tj
20 Projected Capacitive Mutual Capacitance Reduce the apparent capacitance Src: Embedded Design 20 tj
21 Projected Capacitive Mutual Capacitance Single intersection 2 layer ITO Src Electronic Design 21 tj
22 Projected Capacitive Mutual Capacitance Matrix Structure Src: Cypress 22 tj
23 Projected Capacitive Mutual Capacitance Matrix Structure Drive 1 row Scan each column Measure capacitance Provides for multiple touches as each row/column can be detected Operate at a Hz cycle rate Src: Cypress 23 tj
24 Projected Capacitive Mutual Capacitance Controller Src: Intel Goeff Walker 24 tj
25 Projected Capacitive Mutual Capacitance Controller 25 tj
26 Projected Capacitive Mutual Capacitance On Panel 26 tj
27 Projected Capacitive Mutual Capacitance In Cell Critical to design as a part of the display noise, interference 27 tj
28 Surface Acoustic Wave Src: Touch Screen Basics 28 tj
29 Infrared Src: Touch Screen Basics 29 tj
30 Sensor Comparison Src: Cypress 30 tj
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M. C. Escher: Waterfall 18/9/2015 [tsl425 1/29] Direct Current Circuit Consider a wire with resistance R = ρl/a connected to a battery. Resistor rule: In the direction of I across a resistor with resistance
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