LM7MS623 View Datasheet(PDF) - Sharp Electronics
Part Name
Description
MFG CO.
LM7MS623
Sharp Electronics
'LM7MS623' PDF : 28 Pages View PDF
SHARP
SPEC No.
LC99404
MODEL
No.
LM7MS623
PAGE
14
6. Module Driving Method
6-l. Circuit configuration
Fig. 11 shows the block diagram of the module’s circuitry.
6-2. Display face configuration
The display consists of 640 X 240 dots as shown in Fig. 2.
The interface is single panel with single drive to be driven at l/240 duty ratio.
6-3. ‘Lnput data and cqntrol signal
The LCD driver is 160 bits LSI, consisting of shift registers, latch circuits and LCD driver circuits.
Display data which are externally divided into data for each row (640 dots) will be sequentially
transferred in the form of 4- bit parallel data through shift registers by Clock Signal CP2 from the left
top of the display face.
When input of one row (640 dots) is completed, the data will be latched in the form of parallel
data for 640 lines of signal electrodes by latch signal (CPl) then, the corresponding drive signals
will be transmitted to the 640 lines of column electrodes of the LCD panel by the LCD drive circuits.
At this time, scan start-up signal (S) has been transferred from the scan signal driver to the 1st row of scan
electrodes, and the contents of the data signals are displayed on the 1st rows of the display face according to
the combinations of voltages applied to the scan and signal electrodes of the LCD.
While the 1st rows of data are being displayed, the 2nd row of data are entered. When 640 dots of
data have been transferred, they latched on the falling edge of CPl clock, the display face proceeds to the
2nd rows of display.
Such data input will be repeated up to the 240th row of each display segment, from upper row to lower
rows, to complete one frame of display by time sharing method.
Then data input proceeds to the next display frame.
Scan start -up signal S generates scan signal to drive horizontal electrodes.
Since DC voltage, if applied to LCD panel, causes chemical reaction which will deteriorate LCD panel.
drive wave-form shall be inverted at every display frame to prevent the generation of such DC voltage.
Control signal M plays such a role.
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