Wacom Digitizer
Implementation Guide
Component Business Division
Wacom Co., Ltd.
1 • 30.10.2007 • Wacom Confidential
Contents
1. Principle of Wacom EMR
2. General Specification
3. Structure
4. Digitizer Lineup
5. Display Lineup
6. Customizing Digitizer
7. System Designing (EM noise)
8. System Designing2 (metal parts)
9. System Calibration
10.Driver
2 • 30.10.2007 • Wacom Confidential
1. Principle of Wacom EMR
ggy
X axis
Receiver
High frequency
source
Re ceiving and transmitting coil in stylus
Y axis
Coil swit c hing
V
transmit/receive
Antenna coil
Pen
Sensor Board
Signal strength
3 • 30.10.2007 • Wacom Confidential
2. General Specification
W
Digiti
it
Coordinate Accuracy
±
0.4mm (see Note 1 and 2)
p
p
Note 3: Th
acom
Technology EMR (Electro-Magnetic Resonance)
Active Area 263.12 * 165.2 mm for SU5E-12W16AS-00X
Resolution 0.01mm (2540 ppi)
Coordinate Deviation When Tilting Pen
Detectable Pen tilt
Detectable Height 4 to 14mm above the Sensor Board (see Note 1)
Position Report Rate 133 pps
Pressure Resolution 256 levels @ full scale
zer Un
±3mm (tilted ±50º from vertical) (see Note 3)
U
to 50°from vertical
Power Consumption 35mA (max.70mA) @133pps
Note 1: The digitizer sensor unit and pen only, at ordinary temperature.
Note 2: The pen held vertically at 7mm high from sensor board.
4 • 30.10.2007 • Wacom Confidential
e pen held in the center of the active area.
3-1. Structure
EMR digitizer be inserted under the LCD
5 • 30.10.2007 • Wacom Confidential
3-2. Structure
EMR digitizer be inserted under the LCD
6 • 30.10.2007 • Wacom Confidential
4-1. Digitizer Lineup
Sensor : G4 ･･･ glass epoxy sensor
G4.5 ･･･ glass epoxy sensor
G5 ･･･ PET film or FPC (Polyimide)
G4/G4.5
7 • 30.10.2007 • Wacom Confidential
G5
4-2. Digitizer Lineup
G5 sensor
8 • 30.10.2007 • Wacom Confidential
4-3. Digitizer Line up
y
y
Technology :
1. EMR onl
2. Resistive-DualTouch･･･ sensor + Resistive Touch screen interface
3. Capacitive-DualTouch･･･ sensor + Capacitive Touch screen interface
EMR only R-Dual C-Dual
9 • 30.10.2007 • Wacom Confidential
4-4. Digitizer Lineup
Si
(UART)
Interface : UART, USB
gnal assignment
Signal assignment (USB)
10 • 30.10.2007 • Wacom Confidential
4-5. Digitizer Lineup
11 • 30.10.2007 • Wacom Confidential
5. Display Lineup
LCD---Kangaroo type ・E-ink display
12 • 30.10.2007 • Wacom Confidential
6-1. Customizing Digitizer
y
r
y
Condition for digitizer customization
1. Minimum Volume: 30K/
2. There will be NRE and Tooling Cost
ea
13 • 30.10.2007 • Wacom Confidential
6-2. Customizing Digitizer
3
Non
active area must be at least 4mm at each side
tli
Sensor Board Design
1. Must be square shape
rectangle
2. Must be flat
OK
square round
NG
heart
.
14 • 30.10.2007 • Wacom Confidential
-
ou
ne
active area
digitizer
at least
4mm
6-3. Customizing Digitizer
g
g
LCD outline
digitizer outline
Sensor Board Design (continued)
4. Di
1mm
itizer active area needs at lease 1mm buffer from LCD active
area at each side
1mm
LCD active area
1mm
1mm
digitizer active area
15 • 30.10.2007 • Wacom Confidential
6-4. Customizing Digitizer
y
yg
C
iti
DF19L
14P
1H (HIROSE)
t
Baby Board Design
Onl
Interface connector
Counterpart connector: DF19-14S-1S, DF19G-14S-1C (HIROSE) or
standard design available.
onnector on dig
equivalent
zer:
-
-
or equivalen
16 • 30.10.2007 • Wacom Confidential
6-5. Customizing Digitizer
D
1
Confi
t
3
ES sample shipment
8-10 weeks
7
CS
8-10
evelopment Schedule
No. Step Lead Time
rm custom design requiremen
2 Release of tentative shipping specification
*handmade sample with default firmware
4 Customer confirmation of shipping specification
5 System calibration 2 weeks
6 Customer approval of ES sample
sample shipment
*tooled sample with final calibrated firmware
At the same time as ES sample shipment
weeks
8 Release of final shipping specification
8 Customer approval of MP
9 MP shipment 8-10 weeks
Note: Lead time stated here is only reference and may change depending on digitizer design. Please confirm the final
development schedule with Wacom sales.
17 • 30.10.2007 • Wacom Confidential
At the same time as CS sample shipment
(including shipping specification, FW and CS sample)
7-1. System Designing
Some transformers or coils in the power unit generates EM noise
To
prevent
this
•
Inverter
of
LCD
back
light
Prevention of EM noise problem
• Use transformers or coils that won’t allow magnetic flux leakage.
• Place them underneath the shield or in a distance as much as possible from the
sensor board.
• Position them so that EM noise flux did not across the sensorboard.
EM noise source
.
• DC to DC converter in power circuit
18 • 30.10.2007 • Wacom Confidential
7-2. System Designing
!
an affection of the EM noise from the Inverter
EM Noise Countermeasure
LCD
View B-B’
Digitizer
or
Digitizer is sensitive to Electromagnetic Noise.
B
B’
Inverter
Shield
IMPORTANT
Inverter is one of the strongest EM source.
Shielding the inverter with shield plate*1, would improve
19 • 30.10.2007 • Wacom Confidential
As far as you can,please
SEPARATE the Digitizer Unit
.
from the Inverter
7-3. System Designing
g
gpg
EM Noise Countermeasure2
PC Case
COIL
Like DC-DC Converter
In case of PC in one body, motherboard is located right beneath the
Di
itizer unit. Coils in the power unit generates the EM noise and it will
cause of inaccuracy of the Digitizer.
Shield the COIL with shield plate*1 for better Digitizer quality.
LCD
Digitizer
20 • 30.10.2007 • Wacom Confidential
7-4. System Designing
Example of Noise Shield1
Noise Source Shielded
21 • 30.10.2007 • Wacom Confidential
7-5. System Designing
Example of Noise Shield2
Noise Source Shielded
22 • 30.10.2007 • Wacom Confidential
8-1. System Designing2
To
prevent
this
Reduction of metal influence
Some metal structure reduces digitizer signal which causes coordinate error.
• Do not use metal for upper case.
• Contact Wacom to make Error calibrated firmware data.
Metal influence source
• LCD metal bezel and lamp cover
• Upper case ( if it is made of metal )
23 • 30.10.2007 • Wacom Confidential
8-2. System Designing2
EM signal decrease
Minimize Metal influence
LCD Upper Bezel
LCD Lamp cover
Upper case
24 • 30.10.2007 • Wacom Confidential
Metal on the digitizer will disturb the EM signal from the pen.
8-3. System Designing2
Bad Example of Metal Parts1
Full Metal Upper Case
25 • 30.10.2007 • Wacom Confidential
8-4. System Designing2
Bad Example of Metal Parts2
Wrapped by Metal Sheet
26 • 30.10.2007 • Wacom Confidential
9-1. System Calibration
3
Coordinate accuracy
Calib
US$1,200
lib
Wacom will do following evaluation in order to prevent
adverse affect from EM noise and metal parts
1. EM noise environment
2. Coordinate stability
.
Wacom will provide FW data and evaluation report.
Calibration work will take approximately 1-2 weeks.
27 • 30.10.2007 • Wacom Confidential
ration work charge is
per ca
ration.
9-2. System Calibration
•
Wacom will search the EM noise and measure the level
EM noise environment
• EM noise which mimic pen signal can cause digitizer malfunction.
.
28 • 30.10.2007 • Wacom Confidential
9-3. System Calibration
Coordinate stability
EM noise can cause vibration of coordinate detected by digitizer (jitter).
Wacom quantifies the level of jitter by take 100 coordinate data at each
spot and calculating standard deviation and max deviation from mean
location.
29 • 30.10.2007 • Wacom Confidential
9-4. System Calibration
C
lib
oordinate accuracy before ca
Metal parts or EM noise will disturb digitizer signal and can cause the
deterioration of digitizer accuracy.
Digitizer signal can be compensated by calibration up to certain level.
W acom measures the accuracy before and after calibration.
ration
30 • 30.10.2007 • Wacom Confidential
9-5. System Calibration
Coordinate accuracy after calibration
31 • 30.10.2007 • Wacom Confidential
9-6. System Calibration
1
Final design
3
criteria for syste
desig
ed
3
c te a o syste des g s o o ed
When several LCDs are applied for one model, FW needs to be
Before sending calibration machine, please check
below items.
.
2. Tooled product
. All
4. All accessories (eg. AC adaptor) are enclosed
5. Valid OS is installed
6. Wacom stylus (which pen to use with)
7. Assembly drawing to show LCD and digitizer position
Note:
Calibration is required for each design. Any material or design
changes will need another calibration.
m
n is follow
created for each LCD.
32 • 30.10.2007 • Wacom Confidential
10. Driver
Symbian
Note:
Device Driver
Windows Vista, Windows XP, Windows 2000, Windows CE ,
for dual touch, standard interface is USB
33 • 30.10.2007 • Wacom Confidential
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