Read Sharp ER-A880 (serv.man2) Service Manual online
ER-A850 LCD unit
1. Features
1. Display content : 640
×
200 dots (Graphic type)
2. Display mode
: F-STN, transparent type, black-and-white
mode, view angle (6 0’clock), with CFL B/L,
anti-glare polarizing plate
anti-glare polarizing plate
3. Drive system
: 1/200 duty
4. Power source
: +5V, VDD –28V Max.
5. Interface
: CMOS level
2. Absolute max. ratings
Item
Symbol
Rated value
Unit
Power voltage (Logic)
V
DD
– V
SS
7.0
V
Power voltage
V
DD
– V
EE
28.0
V
Input power
Vin
V
SS
t
Vin
t
V
DD
V
Storage temperature range
Tstg
–20
∼
60
°C
Operating temperature range
Top
0
∼
50
°C
3. Mechanical dimensions
Item
Dimensions
Unit
Remark
External dimen-
sions
sions
281.5 (L)
×
116.0 (W)
×
13.6 (D) Max.
mm Excluding
connectors.
Effective display
dimensions
dimensions
246.0 (L)
×
81 (W)
mm
Dot size
0.345 (L)
×
0.345 (W)
mm
Dot pitch
0.348 (L)
×
0.348 (W)
mm
4. Optical characteristics
Item
Symbol
Measurement
conditions
Standard value
Unit
Remark
Min.
Typ.
Max.
Re-
sponse
speed
sponse
speed
Tr
Ta = 25°C
θ
= 0°C
φ
= 0°C
—
160
250
ms
Note 1
Td
—
80
150
ms
Note 3
Contrast
ratio
ratio
C
R
Ta = 25°C
θ
= 0°C
φ
= 0°
10
30
—
Note 2
Note 3
View an-
gle
gle
θ
1
Ta = 25°C
θ
1:
φ
= 0°C
10
—
—
Degree
Note 3
θ
2
θ
2:
φ
= 180°
C
R
u
1.4
20
—
—
Note 1:
Definition of response speed
Note 2:
Definition of contrast C
R
C
R
=
Select segment
brightness
(
B1
)
Non
−
select
segment
brightness
(
B2
)
Note 3:
Definition of view angle
θ
and
φ
θ
: Angle between the measuring point and the normal
φ
: Projection angle between the measuring point and Y
axis on the plane.
5. Electrical characteristics
Item
Symbol
Condition
Min.
Typ.
Max.
Unit
Power volt-
age
age
V
DD
4.5
5.0
5.5
V
LCD drive
voltage
voltage
V
DD
–
V
O
θ
= 0°
φ
= 0°
Ta = 0°C
—
25.8
—
V
Ta = 25°C
—
24.4
—
V
Ta = 50°C
—
22.4
—
V
Power cur-
rent
rent
I
DD
V
DD
= 5V, V
O
= –19.4
Frame frequency =
70Hz
70Hz
—
3.0
4.8
mA
LCD power
current
current
I
EE
—
2.6
4.2
mA
td
10%
tr
90%
1
00%
Drive
waveform
waveform
Non-select state
Light
receiving
section
output
receiving
section
output
select state
Non-select state
B
righ
tnes
s
Rising time
Falling time
B2
B1
B
rig
ht
ne
ss
Brightness curve of the
non-select segment
non-select segment
Brightness curve of the select segment
Drive voltage
(ø=180˚)
θ
2
(ø=270˚)
Y axis(ø=0˚)
(ø=90˚)
θ
1
Normal (
θ
=0˚)
Measurement position
Measurement point
ø
– 75 –
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