The outermost layer of the capacitive touch panel (also known as surface capacitive) is a thin silicon dioxide hardening layer with a hardness of 7h. The second layer is ITO (conductive coating). The conductive layer on the front evenly distributes and conducts low-voltage current, establishing a uniform electric field on the glass surface. When the finger touches the surface of the touch panel, it will absorb a small amount of current from the contact point, causing a voltage drop of the corner electrode, The purpose of touch control is achieved by sensing the weak current of the human body. The function of the lowest ITO is to shield the electromagnetic wave so that the touch panel can work in a good and interference free environment. The projective capacitor, which is the touch control method adopted by the famous Apple iPhone and windows 7, has the feature of supporting multi touch, which can shorten the learning time of users, Just touch the panel with your finger pulp, and you don't need to use a stylus. It has higher light transmittance, saves more power, is more scratch resistant than the resistance type (hardness can reach more than 7h), greatly increases the service life and doesn't need correction Etc.
Touch technology can be divided into:
Resistive, capacitive, surface acoustic wave and optics Among them, capacitive type can be divided into surface capacitive type and projective capacitive type.
Application of touch technology:
Industrial applications (automatic processing machines and tools, measuring instruments, central monitoring and control)
Commercial applications (ticketing system, POS, ATM, ticketing machine, stored value machine)
Life application (mobile phone, satellite positioning GPS, UMPC, small laptop)
Education and entertainment (e-books, portable game machines, song ordering machines, electronic dictionaries)
触控面板透光率比较：电阻式(85%)、电容式(93%)
多点触控面板测试条件：
操作温度范围：-20℃～70℃/20%～85%RH
储存温度范围：-50℃～85℃/10%～90%RH
高温试验：70℃/240、500小时，80℃/240、1000小时，85℃/1000小时，100℃/240小时
低温试验：-20℃/240小时，-40℃/240、500小时，-40℃/1000小时
高温高湿试验：60℃/90%RH/240小时，60℃/95%RH/1000小时 70℃/80%RH/500小时，70℃/90%RH/240、500、1000小时，70℃/95%RH/500小时 85℃/85%RH/1000小时，85℃/90%RH/1000小时
煮沸试验：100℃/100%RH/100分钟
温度冲击-高低温：(温度冲击试验不等同于温度循环试验)
-30℃←→80℃，500cycles
-40℃(30min)←→70(30min)℃，10cycles
-40℃←→70℃，50、100cycles
-40℃(30min)←→110℃(30min)，100cycles
-40℃(30min)←→80℃(30min)，10、100cycles
-40℃(30min)←→90℃(30min)，100cycles
Multi touch panel test conditions:
Operating temperature range: -20 ℃ ~ 70 ℃ /20% ~ 85% RH
Storage temperature range: -50 ℃ ~ 85 ℃ /10% ~ 90% RH
High temperature test: 70 ℃ /240, 500 hours, 80 ℃ /240, 1000 hours, 85 ℃ /1000 hours, 100 ℃ /240 hours
Low temperature test: -20 ℃ /240 hours, -40 ℃ /240, 500 hours, -40 ℃ /1000 hours
High temperature and high humidity test: 60 ℃ /90%rh/240 hours, 60 ℃ /95%rh/1000 hours, 70 ℃ /80%rh/500 hours, 70 ℃ /90%rh/240, 500, 1000 hours, 70 ℃ /95%rh/500 hours, 85 ℃ /85%rh/1000 hours, 85 ℃ /90%rh/1000 hours
Boiling test: 100 ℃ / 100% RH / 100 minutes
Temperature shock - high and low temperature: (temperature shock test is not equivalent to temperature cycle test)
-30℃←→80℃，500cycles
-40℃(30min)←→70(30min)℃，10cycles
-40℃←→70℃，50、100cycles
-40℃(30min)←→110℃(30min)，100cycles
-40℃(30min)←→80℃(30min)，10、100cycles
-40℃(30min)←→90℃(30min)，100cycles
Cold and hot shock test - liquid type: -40 ℃ ←→ 90 ℃, 2cycles
Cold and hot shock test - over normal temperature: -30 ℃ (30min) → R.T. (5min) → 80 ℃ (30min), 20cycles
Service life: 1million times, 2million times, 35million times, 225million times, 300million times
Hardness test: greater than Grade 7 (ASTM D 3363, JIS 5400)
Impact test: with a force of more than 5 kg, knock the weakest periphery and center of the panel respectively
Pin (tail) tensile test: 5, 10 kg pull down
Pin wrap test: 135 ¢ angle, 10 times left and right
Impact resistance test: 11 φ/ 5.5G copper ball falls on the central surface of 1m object at a height of 1.8m, 3 ψ/ 9g stainless steel ball falls at a height of 30cm
Writing durability: more than 100000 words (width r0.8mm, pressure 250g)
Hand touch durability: 1million, 10million, 160million, 200million times or more (width R8 mm, hardness 60 °, pressure 250g, twice per second)
