LM057QCTT03 View Datasheet(PDF) - Sharp Electronics
Part Name
Description
MFG CO.
'LM057QCTT03' PDF : 25 Pages View PDF
SHARP
SPEC No.
LC99908
MODEL No.
LM057QCTT03
PAGE
15
/81
6. Module Driving Method
6-1. Input data’and control signal
One SEG(segment=column)driver
LCD driver circuits.
is a 240 bit output LSI, consisting of shift registers, latch circuits and
Input data for each row (320 X 3[R,G,E?]) will be sequentially transferred in the form of 8 bit parallel
data through shift registers by data transfer clock signal (XCK). When data transfer for one row (320 X
3[R.,G,B]) is completed, the data will be latched in the form of 320 x 3 parallel data corresponding to each
column electrodes by the falling edge of latch signal (LP), then the drive pulses will be output to 320 X 3
lines of column electrodes of the LCD panel by the LCD drive circuits.
At the same time. row N is selected by scan start-up signal (YD) and the contents of the data signals are
displayed on the row N of the display screen according to the combinations of voltages applied to row and
column electrodes. While the data row N are being displayed, data for row N+l are transferred After 320 X 3
data have been transferred, data will be latched by the falling edge of LP and output the data to the row N+l.
Bach row will be sequentially selected as described above from N=l to N=240. One frame is completed
after displaying 240”’ row. Then row scan starts from the 1st row again YD is the scan signal which drives
row electrodes.
If DC voltage is applied, it causes a chemical reaction in LC material and causes a deterioration of LC
material. So, the polarities of driving pulses must be alternated by certain time period. Control signal M is
the signal which changes the polarity of driving pulses.
Power consumption of the LCD module goes up as clock(XCK) frequency goes up due to the nature of
CMOS LSI used in it. This display module has 8 bit parallel data input so that it works at low clock frequency
and rninin&e power consumption. 8 bit display data are assigned to DO-7.
This display module also has a bus line system for data input to minimize the power consumption. Data input
of each LSI driver works only when data is accessed
Data Input for column electrodes and Chip Select of driver LSI work as follows:
The driver LSI at the left end of the screen is selected first and 240 bits of data(30 x XCK) are transferred to it-
After transferring 240 data, the adjacent right side LSI right is selected. This process is sequentially continued
until data is fed to the LSI at the right end of the screen. Thus display data is transferred sequentially through
8 bit bus line from the left to the right of the screen.
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