Read Sharp ER-A880 (serv.man2) Service Manual online
6. Optical characteristics
The specifications in the table below are the values when the LCD
drive voltage is at the value which makes the contrast maximum in the
vertical direction (
drive voltage is at the value which makes the contrast maximum in the
vertical direction (
θ
x =
θ
y = 0°C).
(Ta = 25°C) V
DD
=5 V, V
DD
– V
EE
= V
MAX.
Item
Symbol
Conditions
Min.
Standard
Max.
Unit
Remark
View angle
range
range
θ
x
Co >
4.0
θ
y = 0°
–25
—
25
Degree
Note 1
θ
y
θ
x = 0°
–10
—
20
Degree
Contrast ratio
Co
θ
x =
θ
y = 0°
10
18
—
Note 2
Re-
sponse
speed
sponse
speed
Rising
τ
r
θ
x =
θ
y = 0°
—
80
130
ms
Note 3
Falling
τ
d
θ
x =
θ
y = 0°
—
70
120
ms
[Note 1]
The view angle is defined as shown in Fig. 4.
[Note 2]
Contrast ratio is defined as shown below:
Co =
Full dot
White
brightness
at Vmax
Full dot Dark
brightness
at Vmax
Vmax is defined in Fig. 6.
[Note 3]
In Fig. 8 optical characteristics measurement method, when
select or non-select signal is given by the dot to be meas-
ured, the response characteristics of the light receiving sec-
tion output value is measured from Fig. 7.
select or non-select signal is given by the dot to be meas-
ured, the response characteristics of the light receiving sec-
tion output value is measured from Fig. 7.
Fig. 4 Definition of view angle
Fig. 5 Optical characteristics measurement method
I
Fig. 6 Definition of Vmax
Fig. 7 Optical characteristics measurement method
II
Fig. 8 Definition of response time
Θ
Θ
Θ
+ y
Θ
+ y
Θ
- y
- x
+ x
Θ
- y
Θ
Θ
Θ
+ y
- x
+ x
Θ
- y
Θ
- x
Θ
+ x
Measuring
Field : 2 ˚
Field : 2 ˚
Θ
+ x
TOPCON BM-7
normal
Θ
- y
Θ
+ y
Θ
- x
Θ
+ y
Θ
- x
Measuring sport size: 10mm
Θ
x: Horizontal angle of the visual angle surface to the vertical suface
Θ
y: Vertical angle of the visual angle surface to the vertical suface
Comax
Vmax
VDD-VEE [V]
Co
n
tra
s
t
Voltage
Θ
TEKTRONIX
TYPE549
Storage
oscilloscope
TYPE549
Storage
oscilloscope
(Response measurement)
Memory
scope
scope
Light receiving element
Lens
Measurement spot size:
∅
0.2mm
Visual sensitivity correction filter
LCD panel
Porlarizing plate
Light source
100%
90
%
1/240 Duty
rr
rd
10
%
[Drive waveform]
Noon-select time
Select time
Non-select time
[Response waveform]
L
igh
t r
e
c
e
iv
ing s
e
c
ti
on
out
p
u
t
rr: Rising time
rd: Falling time
rd: Falling time
– 83 –
Click on the first or last page to see other ER-A880 (serv.man2) service manuals if exist.