High Transmittance 6.25 cm (2.5-type) Transmissive Color LCD Panels
ACX307AK
ACX308AK
The 2.5-type color LCD panel is widely used as the monitor
in digital video cameras.
Sony has already released the 200K-dot ACX300CK high-
resolution low-temperature polycrystalline silicon TFT LCD.
Now, Sony is expanding its product line by releasing the
120K-dot ACX307AK and the 60K-dot ACX308AK LCD
panels, which provide identical functionality and have the
same external dimensions as the ACX300CK.
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High transmittance achieved by using
low-temperature polycrystalline silicon
TFT technology.
ACX307AK: 9.0 %
ACX308AK: 10.5 %
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Low power consumption: 50 mW (When
a 12 V power supply is used)
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Analog full color display
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Wide-screen display function
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Up/down and/or right/left inversion
functions
By releasing the new ACX307AK and
the ACX308AK products in addition to
the previously released 200K-dot high-
resolution ACX300CK, Sony now
provides a product line of three 2.5-type
color LCD panels for AV applications
that are compatible in size and shape but
offer differing numbers of active
dots. This allows our customers to
expand their end-product lines while
using only low-temperature polycrystal-
line silicon LCD panels, and increases
flexibility in end product design.
Furthermore, the panel external size can
also be matched to that of amorphous
silicon LCD panels, thus allowing these
products to flexible respond to needs for
interchangeability.
High Optical
Transmittance Achieved
As a result of optimal pixel design in
the context of Sony's unique low-
temperature polycrystalline silicon TFT
technology, the ACX307AK and the
ACX308AK achieve the high aperture
ratios of 73% and 81%, respectively.
Additionally, Sony has adopted a new
pixel structure that significantly
increases the optical transmittance as
compared to conventional amorphous
silicon LCD panels of which the same
number of pixels. In particular, the
ACX307AK achieves 9.0% and the
ACX308AK achieves 10.5%. This
means that these are "even brighter"
LCD panels. (See table 1.)
Extensive Functionality
and Improved Ease of Use
In addition to the up/down and/or right/
left inversion and wide display functions
provided by conventional products,
Sony has developed and adopted volt-
age step-up power supply and negative
voltage generation circuits to reduce the
external power supply and to improve
the ease of use of these products. (See
figure 1.) Sony is also planning to
develop a new single chip IC that inte-
grates both timing generator and control
functions on the same chip to make
drive circuit design far simpler. (See
figure 2.)
V
O
I
C
E
Although up to now we have
focused on high-resolution
devices in our low-temperature
polycrystalline silicon LCDs, in our
current project, we developed
popular devices, the ACX307AK
and the ACX308AK. These devices
make superlative low-temperature
polycrystalline silicon LCD panels
available for a wide range of prod-
ucts, from popular models to high-
class models.
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Figure 1 Panel Block Diagram
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Figure 2 System Block Diagram
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Table 1 6.25 cm (2.5-type) Transmissive LCD Panel
Screen size
Module structure
Number of active dots (H
V)
Screen aspect ratio
Pixel arrangement
Dot pitch (
m)
Aperture ratio (%)
Optical transmittance (%)
Contrast ratio
Supply voltage (V)
Display method
Panel dimensions (W
H
t (mm))
Power consumption (W)
Number of colors
ACX300CK
6.25 cm diagonal
200,000 (880
228)
4 : 3
RGB delta
56.75
163.75
67
8.2
200 : 1
12
NTSC/PAL
61.6
49.3
2.2
0.06
Analog full color
ACX307AK
6.25 cm diagonal
120,000 (560
220)
4 : 3
RGB delta
90
170
73
9.0
200 : 1
12
NTSC/PAL
61.6
49.3
2.2
0.06
Analog full color
ACX308AK
6.25 cm diagonal
60,000 (280
220)
4 : 3
RGB delta
179
170
81
10.5
200 : 1
12
NTSC/PAL
61.6
49.3
2.2
0.06
Analog full color
Voltage set-up generation circuit
Negative voltage generation circuit
COM
pad
COM
LC
Cs
Vertical
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
New
single-chip
IC
LCD panels
ACX300CK
ACX307AK
ACX308AK
WIDE
REF
RGT
EN
DWN
VCK
VST
HCK2
HCK1
HST
COM
BLUE
GREEN
1
F
1
F
V
DDG
V
SSG
V
SS
V
DD
SLVSG
Rext
Cext
Cext/Rext
Zener
diode
RD 3.3
m
Zener
diode
RD 2.7
m
Y/color
difference
RED
PSIG
+12.0 V
+12.0 V
+3.0 V
R/G/B
Buffer
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