Configuring a Video Wall with Bezel Compensation (DOCS-1039)

Overview

A bezel is the physical frame around the display area of a panel, which usually contains a border of black (inactive) pixels that separate that display area from the display area on adjacent panels. If there is no compensation for the bezel, it can cause alignment issues. Bezel compensation, which discards the display content under the central bezels, should be applied to video walls to ensure that displayed images move smoothly across adjacent panels.

Calculating Bezel Size

To calculate the size of a screen bezel in pixels from millimeters, you must multiply the screen width/height in pixels by the bezel size in millimeters, then divide by the screen width/height in millimeters.

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Example

This example uses a 2×2 four panel display wall (see Image 1) where the panel dimensions are 1100mm (1920 pixels) x 620mm (1080 pixels), the vertical bezel is 17mm, and the horizontal bezel is 20mm.

The number of pixels in the vertical bezel area is:

(1920 x 17) / 1100 = 30 pixels

The number of pixels in the horizontal bezel area is:

(1080 x 20) / 620 = 35 pixels.

To get the total bezel-adjusted resolution, add the width to the height:

(1920p + 30p + 1920p) + (1080p + 35p + 1080p) = (3870 x 2195 pixels)

Image 1: Add the bezel area to the wall width and height get the total bezel-adjusted resolution.

Configuring a Video Wall with Bezel Compensation

To configure a 1x2 video wall with bezel compensation:

vm = CreateObject("roVideoMode")
sm = vm.GetScreenModes()

sm[0].video_mode = "1920x1080x60p"
sm[0].transform = "normal"
sm[0].display_x = 0
sm[0].display_y = 0
sm[0].enabled = true

sm[1].video_mode = "1920x1080x60p"
sm[1].transform = "normal"
sm[1].display_x = 0
sm[1].display_y = 1100    'Bezel compensation of 20 pixels 
sm[1].enabled = true

sm[2].enabled = "false"
sm[3].enabled = "false"

vm.SetScreenModes(sm)