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Master Touch 21.5 Inch Multi Touch WD8752 Controller IC GFF Touch Panel
1. Product Description
Master Touch 21.5 inch GFF projected capacitive touch screen panel, via a process of sputtering an ITO pattern on a film substrate to make a film-sensor, perceive touch accurately through capacitance coupling.
Capacitive touch panel works through body's current induction.When finger is on or close to touch panel surface,due to body electric field, the user and touch panel surface forms one coupling capacitance. For high frequency current, capacitance is direct conductor, then fingers suck a small current from the contact point, through amplifying and accurately calculating this current signal, the controller works out the touch point position.
The advantages of 21.5 inch GFF are low capital cost, suitable for small quantity batch production, and light structure.
2. Module Specification
2.1 Basic Information
| Item | Feature | Remarks |
| Controller | WD8752 | - |
| Channel | TX :34 RX: 60 | - |
| Power | 5V | USB: 4.7V ~ 6.0V, Typical:5V |
| Communication | USB | USB: 2.0 Full Speed |
| Number of Touch point | 10 | - |
| O.S. | Windows/ Android/ Linux | |
| Power Consumption | 1.Active Mode: Max.120mA @ USB Input 5V 2.Idle Mode: 90mA @ USB Input 5V 3.Sleep Mode: less than 1mA @ USB Input 5V | |
| Item | Specification | Unit |
| Screen Size | 21.5 | Inch |
| Viewing Area | 477.64(L)×269.11(W) | mm |
| Cover lens O.D | 497.42(L)×297.5(W) | mm |
| Item | Specification | |
| Transparency | Viewing Area | ≧85% |
3. Sensor Specification
| Item | Specification | Unit | ||
| Stacked structure | Cover | 1.8 | mm | |
| Top OCA | 0.125 | mm | ||
| Film Sensor | 0.125 | mm | ||
| Bottom OCA | 0.125 | mm | ||
| Film Sensor | 0.125 | mm | ||
| Sensor Dimension | OD Size | X | 496.42 | mm |
| Y | 289.41 | mm | ||
4. Electrical Specification
| Item | Type | Value | Unit | Remarks |
| Operating Temperature | - | -20 ~ +80 | ℃ | Humidity 20%~85% RH |
| Storage Temperature | - | -30 ~ +80 | ℃ | Humidity 20%~85% RH |
| ESD Requirement | ESD air requirement | ±8 | KV | Air |
| ESD contact requirement | ±6 | KV | Touch |
5. Test
| Item | Specification | Result | |
| Cover lens | Ball Drop | 200g ± 2g 35cm | One drop test on each of the 5 selected points, No damage |
| Hardness | Pencil: 6H Pressure: 1N/45° | Hardness ≧ 6H | |
| Warpage | By Gauge | Warpage 0.1% ≦ Length * | |
| FPC/COF | Bending | Bending range 0-180° 30times Electrical Function ok | - |
6. Drawing
8. Cosmetic Inspection
The following standard only applies to the visual areas. If the TP function is good, the non-visual appearance may negotiate to relax the standard. W=Width L=length D=Diameter GT=Glass thickness. If soft cloth which dips in alcohol can wipe besmirch, it does not apply to this appearance standards.
Inspection methods and conditions:
1)Inspection environment: Temperature:20-22 ℃; Humidity: 65 + 10% RH;
2)Inspector qualifications: The appearance of product must be inspect by a good eyesight inspector.
3) Inspection methods: The distance between inspector and product should be 30±2cm and putting a lamp 12 to 20 watts of cold white fluorescent lamp in the observation station of product.
9. FAQ