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20.1” PowerVue User Guide 150-055
The Picture submenu presents a list of items that depends on the selected video source
(digital, analog RGB, S-video, or composite video). The current version of the product
supports only an analog RGB source. Accordingly, the Picture submenu contains the
following functions:
Navigation Buttons Menu Item Explanation
Brightness
On a CRT monitor, the brightness control is really a black level
adjustment and is set so that the background raster is just cut off
when a black screen is displayed. On an LCD monitor, the
brightness control is a control of the backlight luminance level.
Both black and white levels change with changes in backlight
luminance. When setting this control, the analog luminance
control should be set full clockwise (maximum). The setting of this
control then becomes a limit on the range of the analog luminance
control.
Contrast The contrast adjustment is an adjustment of the gain of the
monitor’s video amplifiers, or, in other words, of the range in
Luminance between black and white. When analog video is
presented to the monitor, a black to white transition is
represented, ideally, by a voltage transition of 0.7V.
Phase
This is the phase relationship between transitions of the monitor
controller’s internal pixel clock, and transitions of pixel information
coming from the external source. The phase should be set after
setting the horizontal size and the frequency while observing an
image presented by the external source. Set the phase to obtain
the sharpest and most distinct vertical lines.
H Position
Set the horizontal position to center the image on the screen.
Make this adjustment after making a first adjustment of horizontal
size. It might be necessary to alternate between horizontal size
and horizontal position once or twice to obtain the best possible
image.
V Position Set the vertical position to center the image on the screen. This is
usually the last format adjustment to be made.
H Size
(Frequency) The legend for this control refers to the frequency of the monitor
controller’s internal pixel clock. Effectively, it is a horizontal size
control.
Sharpness The sharpness adjustment is available to minimize undesirable
artifacts of the image scaling process. If the video source is
presenting an image at the monitor’s native resolution, or if the
scaling mode is set for 1:1 display of the incoming image, no
scaling takes place, and the sharpness setting will have no effect.
However, if the monitor controller is scaling the image, the
sharpness can be set to obtain the best possible image. This
setting should be made while observing a display of text.
Use the UP or DOWN button to select the desired function.
Use the LEFT or RIGHT button to set the value of the selected function.
Use the SOURCE button once a setting has been made, and again to return
to the Main Menu.
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Picture Submenu
RIGHT
LEFT
DOWN
UP
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