RCM1277U-A 查看數據表（PDF） - ROHM Semiconductor
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RCM1277U-A Datasheet PDF : 7 Pages
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Liquid crystal displays
RCM1277U-A
!Optical characteristics (Ta = 25°C)
NO.
Parameter
Symbol Temperature (°C) Min. Typ. Max. Unit
Note
1
Response speed
Tr
25
-
65 130
ms (Note 2)
Td
25
-
45 100
Front-back θ
2
Viewing angle
Right-left
φ
3
Contrast ratio
25
25
0
90
-
-
60
270
deg
(Note 3)
K≥3
25
20
-
-
- (Note 4)
(Note 1) Drive waveform
Static drive
1/f
Vop
1 / 2Vop
0
-1 / 2Vop
-Vop
(Note 2) Definition of response speed
f = Frequency
ON
IOFF
OFF
T
I
Tr
0.11
ION
Td
Tr : Time for segment to darken 90% after selective
Waveform switches to non-selective waveform.
φ = 180°, θ = 10°
Td : Time for segment to darken 90% after selective
Waveform switches to non-selective waveform.
φ = 180°, θ = 10°
(Note 3) Definition of viewing angle (φ, θ)
Z
Y (φ = 0°)
θ
Observer
X (φ = 90°)
LCD
X' (φ = 270°)
φ
Z'
Y' (φ = 180°)
(1) φ : Angle subtended by the Y-Y’-axis and the
observer’s position projected onto the XY-plane.
(2) θ : Angle subtended by observer and the normal
Z-Z’-axis (X-axis and Y-axis are positive)
(3) Maximum viewing angle: The direction with highest
contrast expressed at the time axis (refer to above
table).
(Note 4) Definition of contrast ratio
<Definition>
Contrast ratio =
Luminance during application n
of non-selective waveform
Luminance during application
of selective waveform
Except, n = 1 with positive display and n = -1 with
negative display.
<Measurement conditions>
Drive conditions: As per specifications
Viewing angle: φ = 180°, θ = 10°
(Note 5) Principles of optical measuring equipment
Illumination
Specimen
Characteristic measuring
Photometry device
LC-4M
Constant temperature chamber
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