Sharp UP-3300 Service Manual page 13

4) Entering correction mode
The command "Entering correction mode" is issued to the touch
panel controller.
At this step, the coordinate data of the four corners in the input
area are passed to the controller.
5) Correction points are displayed
The correction points are displayed.
All of the nine correcting points are displayed as follows using the
mark "+". The "+" mark is 18 by 18 dots with 2 dots thick.
VGA Display
18 dots
(16,14) (320,14)
18 dots
(16,240) (320,240)
(16,465) (320,465)
6) Correction points are input
Arbitrary correction points are input. Coordinate data correspond-
ing to its input are output from the touch controller. Note the data
are those of the initial coordinates. (Refer to the table below.)
The point from where the finger leaves the touch panel is defined
as the correction point input position (OFF position).
The data on the nearest correction point is checked, and if almost
appropriate, (regarding data of the initial coordinates, within +/-
100 dots and +/-5mm in size) the command "correction data set"
is issued to the controller. When the panel is released and it is
possible to correct with the panel touched, the mark "+" turns
green.
If the input coordinates are very far from the correction point, it will
be neglected. If the command "correction data set" is terminated
normally, the mark "+" at the correction point turns black.
The input coordinate data are those of the initial coordinates, and
the relation to the correction points is as follows:
The data of the initial coordinates of correction points
393, 402 2080, 402
393, 2048 2080, 2048
393, 3697 2080, 3697
7) Step 6) is repeated for the nine correction points.
Correction is performed in an arbitrary order. At first all of the nine
points are displayed in white and they turn black as corrected.
8) After all of the points are corrected, the command "correction
mode end" is issued to the controller.
The maximum coordinates are (4096, 4096).
9) The display mode is returned to the text mode.
(624,14)
(624,240)
(624,465)
3767, 402
3767, 2048
3767, 3697
3 – 2
*
If the power supply is turned off during correction, the following
messages are displayed and all the steps are started over again.
Calibration failed.
Touch the panel to try again
Calibration flow
Nine correction points are
displayed on VGA screen
Correction mode
Coordinates are obtained
from touch panel controller
N
Panel pressed?
Y
Coordinates are obtained
from touch panel controller
Y
Panel pressed?
N
N
Not-yet corrected
point +/-100?
Y
Correction data set
4. Touch panel/VGA coordinates
•
Touch panel configuration (unit: mm)
243.8(x)
229.4(x2)
18.2(x1)
•
Touch panel coordinates
(0,0) Initial coordinates
(0,0) Touch panel coordinates (4096x4096)
(0,0) VGA coordinates
Y
Correction error?
N
Correction point is thined
Correcting point>corrected
N
All of nine points
finished?
Y
Correction mode end
(640,480)
(4096,4096)
(4096,4096)