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Disclosed is a method to optimize the view of a Liquid Crystal Display (LCD) on a server by automatically changing the display characteristics based on the location of the server in the rack.
English (United States)
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Smart LCD Circuit
Liquid Crystal Displays (LCDs) are commonly used on servers. A known problem with LCDs is the narrow viewing angle. Viewing LCD screens from an angle other than normal to the screen causes a fall-off in readability. One way to get around this is to increase the contrast or backlighting on the screen when viewed from a non-optimal angle.
In rack-mounted servers, the LCD screen is oriented such that optimal viewing is only achieved with the servers at a single height (e.g., set the display to be read looking directly perpendicular to the bezel). If a server is positioned toward the top or bottom of a rack, it is difficult to read the LCD.
The solution is to change the display characteristics based on the location of the server in the rack. The location of a server can be determined in various ways. The easiest method is for the location to be manually entered (this is already done for other reasons), and then the system can adjust default contrast, brightness, backlighting, etc. based on this information. If data is not manually entered, then there are several other methods to determine the location of the servers in a rack (outside the scope of this disclosure).
The viewing angle and contrast adjustment are made based on the position in the rack and an average height and viewing distance for the panel by a system administrator.