Specifications

SPEC No.
LC99213A
MODEL No.
LM10V332
PAGE
12
6. Module Driving Method
6-1. Circuit configuration
Fig.9 shows the block diagram of the module’s circuitry.
6-2. Display face configuration
The display consists of 640×3(R,G,B)×480 dots as shown in Fig. 1.
The interface is single panel with double drive to be driven at 1/240(1/244) duty ratio.
(1/240:an odd number frame, 1/244:an even number frame)
6-3. Input data and control signal
The LCD driver is 240 bits LSI, consisting of shift registers, latch circuits and LCD driver
circuits. Input data for each row (640×3 R,G,B) will be sequentially transferred in the
form of 8 bit parallel data through shift registers from top left of the display together with
clock signal (XCK).
When input of one row (640×3 R,G,B) is completed, the data will be latched in the form of
parallel data corresponding to the signal electrodes by the falling edge of latch signal (LP)
then,the corresponding drive signals will be transmitted to the 640×3 lines of column
electrodes of the LCD panel by the LCD drive circuits.
At this time, scan start-up signal (YD) 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
row of the display face according to the combinations of voltages applied to the scan and
signal electrodes of the LCD. While the data of 1st row are being displayed, the data of 2nd
row are entered. When data for 640×3 dots have been transferred, they will be latched by
the falling edge of LP, switching the display to the 2nd row.
Such data input will be repeated up to the 240(244)th row of each display segment, from
upper row to lower rows, to complete one frame of display by time sharing method.
Simultaneously the same scanning sequence occur at the lower panel.
Then data input proceeds to the next display frame.
YD generates scan signal to drive horizontal electrodes.
Since DC voltage, if applied to LCD panel, causes chemical reaction in LC materials,
causing deterioration of the materials, 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.