Miniature High-Precision 4.6 cm (1.8-type) 118K-Dot Digital Still Camera Color LCD
Features a Viewing Area Ratio of 100%
ACX312AK
The 1.8-type color LCD panel is widely used as the monitor
in digital still cameras.
Sony has already released the ACX306AK low-temperature
polycrystalline silicon TFT LCD as a 1.5-type 118K-Dot min-
iature high-precision model.
Sony has now added the 1.8-type ACX312AK, which provides
the same functionality with the same number of dots, to their
product line, expanding the Sony lineup of products for use
in digital still cameras.
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4.6 cm (1.8-type) 118K dots
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Complete 100% viewing area ratio with 0%
overscan
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High contrast (200:1) and high optical
transmittance (8.6%) despite miniaturization
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Power saving function provides even lower
power consumption during standby mode
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Up/down and/or right/left inversion
functions
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Supports NTSC and PAL
V
O
I
C
E
Of our low-temperature polycrys-
talline silicon LCD products, the
ACX312AK aims to become a
de facto standard due to its
specialization for use in digital
still cameras. This LCD repre-
sents the crystallization of efforts
and technologies contributed by
many engineers, and we are
convinced that this device is
superior to other manufacturers'
LCDs, both in performance and
quality. I hope many digital still
camera developers will adopt this
product.
Viewing Area Ratio of
100%
The ACX312AK achieves a viewing
area ratio of 100% by setting the
overscan to 0%. This allows all of the
image taken by the CCD to be displayed
with nothing missing to prevent the loss
of critical images.
Full Complement of
Functions Despite
Miniaturization
By adopting Sony's TFT polycrystalline
silicon technology developed over many
years, the ACX312AK manages to pro-
vide all of the functions of the conven-
Improved Ease of Use
The CXA3572R provides many advan-
tages over the conventional CXA3522R.
(See table 2.) First, the package has been
reduced in size from a 72-pin LQFP to
a 48-pin LQFP, thus cutting in half the
space taken by the IC on the printed
circuit board. This increases the degrees
of freedom available in end product
design. Second, the VCO has been
integrated on the chip, obviating the
need for an external oscillator circuit
and reducing the number of external
components required. The previously
required PSIG buffer is planned to be
integrated as well, allowing a further
parts count reduction. Furthermore,
since this 1.8-type device has the same
number of dots as the conventional 1.5-
type device, the same printed circuit
board can also be used for end products
that use a 1.5-type device, thus contrib-
uting to reduced design costs when
creating a line of end products.
tional ACX300 Series products (2.0
type to 3.5 type) despite its ultrasmall
form. In particular, it includes up/down
and/or right/left inversion functions to
increase the degrees of freedom avail-
able in end product design. Further-
more, it achieves high contrast (200:1)
and high transmittance (8.6%), and is
at the top level of number of effective
pixels per unit area (115.4 dots/mm
2
)
in the ACX300 Series. As a result, it
provides smooth fine-grained images
with no apparent dots and a high pic-
ture quality. At the same time it can
contribute to reduced overall power
consumption in end product designs.
System IC
Sony provides the new CXA3572R
system IC, which was developed along
with the ACX312AK. This system IC
integrates the timing generator and the
RGB drivers on a single chip. The
CXA3572R supports both NTSC and
PAL, and accepts either Y/color differ-
ence or RGB signals as input. It includes
up/down and/or right/left inversion
functions to take advantage of the pan-
els' features. Furthermore, it includes
power saving functions to reduce power
consumption in standby mode even
further. (See figures 2 and 3.)
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Figure 3 CXA3572R Block Diagram
25
SYNC IN
26
DA OUT
27
REF
12
24
B/B-Y
37
V
DD
38
HDO
39
VDO
40
RGT
41
V
SS
42
HCK1
43
HCK2
44
HST
45
V
DD
46
WIDE
47
DWN
48
V
SS
23
R/R-Y
22
G/Y
21
V
CC
1
20
OSD G
19
OSD R
18
OSD B
15
PSIG DC DE
T
14
PSIG OUT
13
V
CC
2
16
SIG.C
17
N.C.
G OUT
11 G DC DET
10 R OUT
9 R DC DET
8 B OUT
7 B DC DET
6 COM
5 GND2
4 TEST
3 VST
2 VCK
1 EN
29
RPD
30
GND1
31
SEN
32
SCK
33
SDAT
34
VD
35
XCLR
36
POF
28
FILTER
ATT
Picture
Hue
color
ATT
ATT
REF
COM
LPF
trap
OSD
BLIM
S/H
Sub-
contrast
User-
bright
Sub-
bright
PSIG-
bright
Clock
generator
Analog block
3-V system
Analog block
12-V system
Digital block
3-V system
Serial I/F
Timing generator
Serial I/F
DAC
Phase
comparator
PLL
counter
H. filter
Gamma 1
Gamma 2
Contrast
DA
DL
DL
SYNC SEP
Matrix
Picture
f0
LPF SW
LPF
TRAP
SUB-
CONT R
SUB-
CONT B
PSIG-
BRIGHT
PSIG-
PowerSW
VCO
ADJ
fine
VCO
ADJ
coarse
CONTRAST
IR
+3 V
0 V
+3 V
0 V
RP
CK
HD_
CSYNC
BLK
FRP
SH2
XCLP SH1
SH3
SH4 XSTBY1
XSTBY2
USER-
BRIGHT
SYNC SEL
1
2
R-
BRIGHT
B-
BRIGHT
Mode
+3 V
+12 V
Picture
gain
Hue
COM
FRP
Color
R, G, B
DA
BLIM
If the internal sync separation circuit is not used, either CSYNC
or HD and VD are used as the input sync signal.
If the internal sync separation circuit is used, sync on green
(RGB) or Y (Y/color difference) is used as the input sync signal.
Pin used for power saving mode.
VST, VCK, EN, DWN,
WIDE, HST, HCK, RGT
PSIG, VCOM
LCD panel
ACX306BK
(1.5 type)
ACX312AK
(1.8 type)
R, G, B
Video signal
*
1
(RGB or Y/color difference)
(NTSC/PAL)
CSYNC or
HD, VD
*
1
3 V
V
DD
SDAT, SCK, SEN
POF
*
2
CXA3572R
Three-wire serial
communication
(microcomputer
or other device)
*
1
*
2
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Figure 2 ACX312AK/306BK Drive System Block Diagram (single-chip structure)
Package
Model
CXA3522R
72-pin LQFP
Input method
Y/color difference
or RGB
Display method
NTSC/PAL
Supply voltage
3 V and 12 V
VCO
External
PSIG buffer
External
INPUT SEL
*
1
Not available
SYNC SEL
*
2
Not available
CXA3572R
48-pin LQFP
Y/color difference
or RGB
NTSC/PAL
3 V and 12 V
Internal
Planned to be
provided built in
Available
Available
*
1: Input signal level setting in RGB mode
*
2: On/off setting for the internal sync separation circuit
s
Table 2
Drive System IC Specifica-
tions Comparison
Screen size
Model
Number of active dots
Pixel arrangement
Optical transmittance
Contrast ratio
Supply voltage
Display method
Panel dimensions (W
H
t (mm))
Power consumption
Number of colors
System IC
ACX306AK
3.8 cm (1.5 type)
118K dots (490
240)
RGB delta
6.5
200 : 1
12
NTSC/PAL
38.0
32.6
2.06
43
Analog full color
CXA3572R
ACX306BK
3.8 cm (1.5 type)
118K dots (490
240)
RGB delta
7.5
200 : 1
12
NTSC/PAL
38.0
32.6
2.06
43
Analog full color
CXA3572R
ACX312AK
4.6 cm (1.8 type)
118K dots (490
240)
RGB delta
8.6
200 : 1
12
NTSC/PAL
43.6
35.9
2.06
43
Analog full color
CXA3572R
(H
V)
(%)
(V)
(mW)
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Table 1 Digital Still Camera LCD Specifications Comparison
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Figure 1 ACX312AK Block Diagram
Voltage set-up generation circuit
Negative voltage generation circuit
COM
pad
COM
LC
Cs
Level
shifter
Horizontal level shifter and shift register
Vertical shift register
1
TESTL
2
COM
3
VST
4
VCK
5
EN
6
DWN
7
V
DD
8
V
SS
9
V
DDG
10
V
SSG
11
SLVSG
12
WIDE
13
HST
14
REF
15
TEST
16
Cext/Rext
17
HCK2
18
HCK1
19
PSIG
20
GREEN
21
RED
22
BLUE
23
RGT
24
TESTR
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