Liquid Crystal Display (LCD): Notes

Fig 1: Identifying Liquid Crystal Display (LCD)

Courtesy of LAND ROVER NORTH AMERICA, INC.

The instrument pack has four separate LCD's which show the following data:

Odometer - Displays the total vehicle distance travelled
Trip meter - Displays the total vehicle distance travelled since last reset
Ambient temperature - Displays the external ambient temperature in °C or °F
Message center - Displays system information to the driver.

The LCD is an integral part of the instrument pack. The LCD comprises black segments on a grey background or green illuminated when the light switch is on. The LCD is illuminated by backlighting which is provided by five 12V/1.5W single filament bulbs.

The backlighting has manual and automatic brightness control. The manual brightness control is only available when the lighting switch is on and is operated using the illumination dimmer rheostat on the fascia, adjacent to the lighting switch. The automatic brightness adjustment is controlled by one of the instrument pack microprocessors and a phototransistor. The phototransistor is located in the instrument pack, adjacent to the MIL/Service Engine Soon warning lamp. The phototransistor measures the available ambient light and adjusts the display brightness accordingly.