CXD2412AQ Datasheet, PDF (14/36 Pages) Sony Corporation – Timing Generator for LCD Panels

CXD2412AQ
Right/Left Inversion and Up/Down Inversion
The LCD panel is arranged in a delta pattern, where an identical signal line is 1.5-dot offset for every horizontal
line. For this reason, a 1.5-bit offset is made to the horizontal start pulse HST of the LCD between lines. HCK
and S/H (sample and hold) are also 1.5-bit offset in a similar manner.
When the panel is driven with right/left inversion or up/down inversion, this offset relationship becomes inverted
for even and odd lines. Moreover, since the dot arrangement is asymmetrical, the HST position is also offset.
Right/left inversion and up/down inversion are supported by the TG as follows.
(1) Two types of output pulses for right scan (A output) and left scan (B output) are prepared for HST, HCK to
allow right/left inversion present/absent mixed three-panel LCDs to be driven simultaneously. In addition,
XRGT (RGT inverse output) is prepared for the left scan panel. SH1 and SH3 connections to the driver are
reversed for sample-and-hold.
(2) Left scan pulses are output to the A output by setting the right/left inversion input pin RGT to low. Also,
XRGT is driven high by setting RGT to low.
(3) The A and B outputs output up scan pulses by setting the up/down inversion input pin DWN to low.
Down scan
Up scan
Right scan
Left scan
H SCANNER
Display area
Right/left inversion compatible SH wiring diagram
SH1
SH2
TG
SH3
SH4
SH1
SH2
A output
SH3
driver
SH4
SH1
SH2
B output
SH3
driver
SH4
The relationship between the output pins and switches is summarized below.
TG input pin
DWN RGT
H
H
H
L
L
H
L
L
A output HST, HCK
For right scan, down scan
For left scan, down scan
For right scan, up scan
For left scan, up scan
B output HST, HCK
(Three-panel LCD auxiliary output)
For left scan, down scan
For right scan, down scan
For left scan, up scan
For right scan, up scan
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