1
E98X21-PS
Sony reserves the right to change products and specifications without prior notice. This information does not convey any license by
any implication or otherwise under any patents or other right. Application circuits shown, if any, are typical examples illustrating the
operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits.
1.4cm (0.55-inch) NTSC/PAL Color LCD Panel
Description
The LCX027AKB is a 1.4cm diagonal active matrix
TFT-LCD panel addressed by polycrystalline silicon
super thin film transistors with built-in peripheral
driving circuit. This panel provides full-color
representation in NTSC/PAL mode. RGB dots are
arranged in a delta pattern featuring high picture
quality of no fixed color patterns, which is inherent in
vertical stripes and mosaic pattern arrangements.
Features
The number of active dots: 180,000 (0.55-inch; 1.397cm in diagonal)
Horizontal resolution: 400 TV lines
High optical transmittance: 4.2% (typ.)
High contrast ratio with normally white mode: 200 (typ.)
Built-in H and V drivers (built-in input level conversion circuit, TTL drive possible)
High quality picture representation with RGB delta arranged color filters
Full-color representation
NTSC/PAL compatible
Right/left inverse display function
4:3 and 16:9 aspect switching function
Element Structure
Dots
Total dots : 827 (H)
228 (V) = 188,556
Active dots: 800 (H)
225 (V) = 180,000
Built-in peripheral driver using polycrystalline silicon super thin film transistors.
Applications
Viewfinders
Super compact liquid crystal monitors etc.
LCX027AKB
For the availability of this product, please contact the sales office.
2
LCX027AKB
Block Diagram
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
H Shift Register
V Level
Conversion
Circuit
V
S
h
i
f
t
R
e
g
i
s
t
e
r
C
S
LC
COM
Pad
V
D
D
V
S
S
V
S
T
V
C
K
(
N
C
)
E
N
C
L
R
R
G
T
H
S
T
H
C
K
2
H
C
K
1
B
L
K
B
L
U
E
R
E
D
G
R
E
E
N
C
O
M
Top/bottom
BLK Control
Circuit
H Level
Conversion
Circuit
3
LCX027AKB
Absolute Maximum Ratings (V
SS
= 0V)
H and V driver supply voltages
V
DD
1.0 to +17
V
H driver input pin voltage
HST, HCK1, HCK2
1.0 to +17
V
RGT
V driver input pin voltage
VST, VCK
1.0 to +17
V
CLR, EN, BLK
Video signal input pin voltage
GREEN, RED, BLUE
1.0 to +15
V
Operating temperature
Topr
10 to +70
C
Storage temperature
Tstg
30 to +85
C
Operating Conditions (V
SS
= 0V)
Supply voltage
V
DD
11.4 to 12.6
V
Input pulse voltage (Vp-p of all input pins except video signal input pins)
Vin
2.6V (more than)
Pin Description
Pin
No.
1
2
3
4
5
6
7
8
COM
GREEN
RED
BLUE
BLK
HCK1
HCK2
HST
Common voltage of panel
Video signal (G) to panel
Video signal (R) to panel
Video signal (B) to panel
Top/bottom block display pulse
Clock pulse for H shift register
drive
Clock pulse for H shift register
drive
Start pulse for H shift register
drive
9
10
11
(12)
13
14
15
16
RGT
CLR
EN
(NC)
VCK
VST
Vss
V
DD
Drive direction pulse for H shift
register (H: normal, L: reverse)
Improvement pulse for
uniformity
Enable pulse for gate selection
Not connected
Clock pulse for V shift register
drive
Start pulse for V shift register
drive
GND (H, V drivers)
Power supply for H and V drivers
Symbol
Description
Pin
No.
Symbol
Description
4
LCX027AKB
Input Equivalent Circuit
To prevent static charges, protective diodes are provided for each pin except the power supply. In addition,
protective resistors are added to all pins except video signal input. All pins are connected to Vss with a high
resistance of 1M
(typ.). The equivalent circuit of each input pin is shown below: (The resistor value: typ.)
(1) Video signal input
Input
V
DD
From H driver
Signal line
1M
(2) HCK1, HCK2
V
DD
250
250
250
250
Level conversion
circuit (2-phase
input)
HCK1
HCK2
1M
1M
(3) HST
Level conversion
circuit (single-
phase input)
250
250
V
DD
Input
1M
(4) RGT, VST, CLR, EN, VCK, BLK
Level conversion
circuit (single-
phase input)
2.5k
2.5k
V
DD
Input
1M
(5) COM
Input
1M
LC
V
DD
5
LCX027AKB
Level Conversion Circuit
The LCX027AKB has a built-in level conversion circuit in the clock input unit located inside the panel. The
circuit voltage is stepped up to V
DD
inside the panel. This level conversion circuit meets the specifications of a
3.0V power supply of the externally-driven IC.
1. I/O characteristics of level conversion circuit
(For a single-phase input unit)
An example of the I/O voltage characteristics of a
level conversion circuit is shown in the figure to the
right. The input voltage value that becomes half the
output voltage (after voltage conversion) is defined
as Vth.
The Vth value varies depending on the V
DD
voltage.
The Vth values under standard conditions are
indicated in the table below. (HST, VST, EN, CLR,
RGT, VCK and BLK in the case of a single-phase input)
V
DD
= 12.0V
V
DD
2
V
DD
Vth
Input voltage [V]
Example of single-phase
I/O characteristics
O
u
t
p
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t
v
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t
a
g
e
(
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n
s
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p
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l
)
Item
Vth voltage of circuit
Vth
0.35
1.50
2.60
V
Symbol
Min.
Typ.
Max.
Unit
(For a differential input unit)
An example of I/O voltage characteristics of a level
conversion circuit for a differential input is shown in
the figure to the right. Although the characteristics,
including those of the Vth voltage, are basically the
same as those for a single-phased input, the two-
phased input phase is defined. (Refer to clock
timing conditions.)
V
DD
2
V
DD
Vth
Input voltage [V]
Example of differential I/O
characteristics
O
u
t
p
u
t
v
o
l
t
a
g
e
(
i
n
s
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p
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l
)
2. Current characteristics at the input pin of level conversion circuit
A slight pull-in current is generated at the input pin
of the level conversion circuit. (The equivalent
circuit is shown to the right.) The current volume
increases as the voltage at the input pin decreases,
and is maximized when the pin is grounded. (Refer
to electrical characteristics.)
V
DD
output
HCK1
input
HCK2
input
Level conversion equivalent circuit
0
0
Max. value
Input pin voltage [V]
10
Pull-in current characteristics at the input pin
I
n
p
u
t
p
i
n
c
u
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r
e
n
t
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