Touch screen leh information thawn chhuahna medium-a working principle ang chuan touch screen chu chi li-ah kan then a, chungte chu resistive, capacitive inductive, infrared, leh surface acoustic wave te an ni. Touch screen chi hrang hrang hian a thatna leh a that lohna a nei vek a. Chumi atana hman tur touch screen chi hrang hrang hriatthiam nan chuan a pawimawh ber chu touch screen technology chi hrang hrangte hnathawh dan leh an nihna hriatthiam hi a ni. A hnuaia tarlan ang hian a chunga kan sawi tak touch screen chi hrang hrangte hi tawi te tein kan rawn tarlang dawn a ni.
1, Resistive Touch Screen (Resistive Touch Screen Working Principle) 1.1 Palina-Wire Resistive Screen 1.2 Five{4}}Wire Resistive Screen 2, Capacitive Touch Screen, Infrared Touch Screen (Infrared Touch Screen Working Principle) 4, Surface Acoustic Wave Screen (surface acoustic wave the working principle acoustic acoustic acoustic acoustic acoustic acoustic acoustic acoustic acoustic acoustic acoustic acoustic acoustic acoustic acoustic acoustic acoustic acoustic acoustic acoustic acoustic acoustic acouse a awm. A chhe thei lo, scratch resistance tha tak (surface film chu resistance, capacitance, etc. chungchangah a ni). a chhang let thei. boruak lum leh vawt, resolution sang, dam rei (a let maktaduai 50-a enkawlna tha) ang chi environmental factors-in a nghawng loh high light transmittance (92%), image quality chiang leh translucent tak nei thei; No drift, calibration pakhat chauh dah la; Third axis (ie pressure axis) response a awm a, tunah hian vantlang hmunah hman tam zawk a ni. Surface acoustic wave screen hian enkawl fo a ngai a, a chhan chu leivut, oil stain leh tuihnai tak tak te pawh screen chung lamah a bawlhhlawh a, chu chuan touch screen chunglama waveguide groove chu a block ang a, chutiang chuan wave chu a tlangpuiin a chhuak thei lo ang a, a nih loh leh waveform chu a thlak danglam thei ang a, controller chuan a hre chiang thei lo ang a, chu chuan touch screen hman dan pangngai a nghawng a ngai ang a, chu chuan environment sanitation chu a ngaihven a ngai ang. Screen chunglam chu screen fai taka awm theih nan leh a regular taka phihfai fo tur a ni.
A hnuaia tarlan te hi resistive touch screen chipchiar taka tarlan a ni. Tunah chuan modified navigation zawng zawng hian four-wire resistive touch screen an hmang vek tawh.
Resistive touch screen chu sensor a ni a, chu chuan touch point (x, y) chu rectangular area-a physical position chu x coordinate leh y coordinate entir voltage-ah a chantir a ni. LCD module tam takah chuan resistive touch screen an hmang a, chu chuan pali{{1}wire, panga-wire, pasarih-wire emaw eight-wire hmangin screen bias voltage a siam thei a, a read back thei bawk.
Resistive touch screen hi a bul berah chuan film-plus-glass structure a ni. Film leh glass-a a kianga awm chu ITO (indium tin oxides) coating hmanga khuh a ni. ITO hian conductivity tha leh transparency tha tak a nei. . Touch a nih chuan film hnuaia ITO chuan glass chunglam layer-a ITO chu a biak ang a, a kaihhnawih electrical signal chu inductor kaltlangin a thawn ang a, conversion circuit kaltlangin processor-ah a thawn ang a, screen-a X leh Y value-ah a chantir ang a, point chu a zo tawh ang. Action thlan chu screen-ah tarlan a ni.
Touch screen principle .
Touch screen-ah hian transparent layer pahnih a awm a, chungte chu a chungah an dah khawm a ni. Four-wire leh eight-line touch screen te hi transparent resistive material pahnih surface resistance inang nei atanga siam an ni. Five-wire leh seven-wire touch screen te hi resistive layer leh conductive layer atanga siam a ni a, a tlangpuiin elastic material hmangin layer pahnih te hi an inthen thin. Touch screen chunglama pressure (pen tip emaw finger emaw press ang chi) a lian tawk chuan a chung layer leh a hnuai layer inkarah contact a awm a. Resistive touch screen zawng zawng hian voltage divider principle hmangin X leh Y coordinate aiawhtu voltage an siam chhuak vek a. Figure 1-a kan hmuh angin, voltage divider chu resistor pahnih series-a connect-in implement a ni. Upper resistor (R1) chu positive reference voltage (VREF) nen a inzawm a, lower resistor (R2) chu ground-ah a inzawm bawk. Resistor pahnih junction-a voltage tehna chu a hnuaia resistor resistance nen a inmil a ni.
Resistive touch screen-a coordinate pakhat chu direction bik a teh tur chuan resistive layer chu biased a ngai a: a sir khat chu VREF nen a inzawm a, a sir dang chu grounded a ni. Tin, unbiased layer chu ADC pakhat impedance input sang takah connect bawk ang che. Touch screen-a pressure a lian tawk a, layer pahnih inkar a inhnaih theih nan resistive surface chu resistor pahnih ah then a ni. An resistance chu touch point atanga offset edge thlenga hlat zawng nen a inzat a ni. Touch point leh ground side inkar resistance chu voltage divider hnuaia awm nen a inang a ni. Chuvangin, unbiased layer-a voltage tehna chu touch point atanga ground side thlenga hlat zawng nen a inzat a ni.
pali-wire touch screen a ni.
Four-wire touch screen ah hian resistive layer pahnih a awm a. Layer pakhatah chuan screen veilam leh dinglam sir ah vertical bus a awm a, a dang chuan screen hnuai leh chung lamah horizontal bus a nei bawk.
. X-axis direction-a tehna siam tur chuan veilam bus chu 0V-ah biased a ni a, right bus chu VREF-ah biased a ni. A chung emaw a hnuai emaw bus chu ADC-ah connect la, a chung leh a hnuai layer-te a inhnaih hunah tehna siam rawh. /i{{5}"+ a ni.
Figure 1-ah hian y-axis direction-a tehna atan top bus biased leh Vref-a bottom bus biased chu 0V-a biased a ni. ADC input chu veilam emaw dinglam emaw bus-ah a tawp a, a chung layer chu a hnuai layer nena a inhnaih chuan voltage chu teh a ni. Figure 2-ah hian layer pahnih inhnaih a nih chuan four-wire touch screen model awlsam zawk a lang. Four-wire touch screen atan chuan connection method tha ber chu VREF-a biased bus chu ADC-a positive reference input-ah a inzawm a, bus chu ADC-a negative reference input-ah 0V-ah a dah a ni. SY=$\\hj a ni.
panga-wire touch screen a ni.
@mtm8e6au ah a awm.
Five-wire touch screen hian resistive layer leh conductive layer a hmang a. Conductive layer hian contact a nei a, a tlangpuiin a sir khatah a awm thin. Resistive layer kil li awmna hmun tinah hian contact pakhat a awm a. x-axis direction-a teh tur chuan veilam leh veilam sir chunglam chu VREF-ah biased a ni a, dinglam leh dinglam sir chung lam chu grounded a ni. Left leh right corner te hi voltage inang an nih avangin effect chu veilam leh dinglam nena inzawm bus nen a inang a, pali-wire touch screen-a hman dan nen a inang a ni.
Y-axis zawh zawnga teh tur chuan veilam leh dinglam sir chunglam chu VREF-ah offset a ni a, veilam leh dinglam sir hnuai lam chu offset-ah 0V a ni. A chung leh a hnuai lam chu voltage inang vek an nih avangin, effect chu a chung leh a hnuai lam kil inzawmtu bus nen a inang tlangpui a, pali-wire touch screen-a hman dan nen a inang a ni. He measurement algorithm thatna chu a chung veilam leh dinglam sir a voltage te chu a awm reng a; Mahse grid coordinate hman a nih chuan X leh Y axes te chu reverse a ngai a ni. Five-wire touch screen tan chuan connect dan tha ber chu a chung veilam sir (offset to VREF) chu ADC a positive reference input nen a inzawm a, a hnuai veilam sir (offset to 0V) chu ADC negative reference input nen a inzawm a ni.
pasarih-Line touch screen a ni.
Seven-line touch screen hi panga-line touch screen ang bawkin implement a ni a, chu chu line pakhat chu veilam leh dinglam sir chung lamah a dah a ni. Screen measurement i tih hian veilam sir a line pakhat chu VREF ah connect la, line dang chu SAR ADC positive reference end ah connect rawh. Chutih rual chuan, a hnuai lam dinglam sir a line pakhat chu 0V nen a inzawm a, line dang chu SAR ADC negative reference end nen a inzawm bawk. Conductive layer hi voltage divider voltage tehna atan hman a la ni reng a. : 1. .
pariat-Line touch screen a ni.
Bus tinah line pakhat dah belh bakah hian eight-Wire Touch Screen hi four-Wire touch screen ang bawkin implement a ni bawk. VREF bus tan chuan line pakhat chu VREF connect nan hman a ni a, line dang chu DAC ADC-a digital-to-analog converter atana positive reference input atan hman a ni. 0V bus tan chuan line pakhat chu 0V connect nan hman a ni a, line dang chu DAC ADC-a digital-analog converter-a negative reference input atan hman a ni. Unbiased layer-a wire pali zinga pakhat tal chu voltage divider voltage tehna atan hman theih a ni.
Contact a awm leh awm loh enfiah rawh .
Touch screen zawng zawng hian touch a awm chuan a detect thei a, layer pakhat chu pull weak pull-up resistor hmanga pull a, layer dang chu strong pull-down resistor hmanga pull a ni. Pull-up layer tehna voltage chu logic threshold engemaw zat aia tam a nih chuan touch a awm lo tih a tilang a, a lehlamah pawh a ni. Hetiang approach-a buaina chu touch screen hi capacitor lian tak a nih avangin LCD-in a rawn luhtir noise chu filter chhuah theih nan touch screen leads capacitance tihpun a ngai mai thei. Capacitor lian tak nena inzawm pull-up resistor chak lo tak chuan rise time a ti rei thei a, false touch hmuhchhuahna a thlen thei bawk.
