Display Mode
Horizontal
Frequency
(kHz)
Vertical
Frequency
(Hz)
Pixel Clock
(MHz)
Sync Polarity
(H/V)
IBM, 640 x 350
31.469
70.086
25.175
+/-
IBM, 640 x 480
31.469
59.940
25.175
-/-
IBM, 720 x 400
31.469
70.087
28.322
-/+
MAC, 640 x 480
35.000
66.667
30.240
-/-
MAC, 832 x 624
49.726
74.551
57.284
-/-
VESA, 640 x 480
37.500
75.000
31.500
-/-
VESA, 640 x 480
37.861
72.809
31.500
-/-
VESA, 800 x 600
35.156
56.250
36.000
+,-/+,-
VESA, 800 x 600
37.879
60.317
40.000
+/+
VESA, 800 x 600
46.875
75.000
49.500
+/+
VESA, 800 x 600
48.077
72.188
50.000
+/+
VESA, 1024 x 768
48.363
60.004
65.000
-/-
VESA, 1024 x 768
56.476
70.069
75.000
-/-
VESA, 1024 x 768
60.023
75.029
78.750
+/+
VESA, 1280 x 1024
63.981
60.020
108.00
+/+
VESA, 1280 x 1024
79.976
75.025
135.00
+/+
SUN, 1280 x 1024
81.129
76.106
135.00
-/-
Resolutions Supported
Horizontal Frequency
The time to scan one line connecting the right edge to the left edge of the screen horizontally is
called Horizontal Cycle and the inverse number of the Horizontal Cycle is called Horizontal
Frequency. Unit: kHz
Vertical Frequency
Like a fluorescent lamp, the screen has to repeat the same image many times per second to
display an image to the user. The frequency of this repetition is called Vertical Frequency or
Refresh Rate. Unit: Hz
If the signal transferred from the computer is the same as the following Preset Timing Modes, the
screen will be adjusted automatically. However, if the signal differs, the screen may go blank while
the power is on. Refer to the video card manual and adjust the screen as follows.
Preset Timing Modes
11
TR-LCD1900-OCD User Manual
