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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 –
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