Table of Contents E70 Head-Up Display Workbook Subject Page Head-up Display (HUD).4 Display Area .5 Mirrors .8 Adjusting the Brightness .8 Adjusting the Height of the Horizon.8 Vertical Rotation of the HUD .9 Image Defects .9 Correcting Distortion (warping) .9 Initial Print Date: 12/06 Revision Date: Table of Contents Subject Page Head-Up Display Model: E70 Production: From Start of Production ■BIICTWIS After completion of this module you will be able to: • Demonstrate the functions of the Head-up Display on the E70. • Identify the changes to the HUD in comparison with the previous system. E70 Head-Up Display Workbook 3 4 E70 Head-Up Display Workbook Head-up Display (HUD) The very name "Head-up" describes the principle benefit of this system.The Head-up display (HUD) projects important informa¬ tion such as cruise control data or instructions from the navigation arrow are reflected onto a special glass windshield and are thus permanently in the driver's field of vision. This include the display of: • Cruise control DCC Data • Navigation system information • Check Control messages • Vehicle speed. This HUD system is similar to that of the 6 Series and 5 Series with enhanced features and service adjustment procedures. The separate components of the head-up display are the cover glass, 2 mirrors, LED power supply, LED array, TFT projection dis¬ play, PCB and casing. The head-up display can only be replaced as a complete unit. It is not possible to replace components or separate parts. Index Explanation Index Explanation 1 Carrier bracket 3 Hexagon bolts 2 Head-up display HUD A TFT (Thin Film Transistor) is a (silicon based) three layersemi- conductor.The device is a millimeterthickand allows lightto shine through a filter when an electrical current is applied. TFTs project precise colors when subjected to a potent light source and are the technology used on modern Thin Film Transistor Active Matrix Liquid Crystal Displays (TFTAMLCD). An LED array acts as this light source. The image content is creat¬ ed by the (TFT)Thick FilmTransistor projection display. The TFT projection display can be compared to a filter which admits or blocks light. An optical imaging element determines the shape, distance and size of the HUD images. The image appears to float freely over the road, the windshield acts as a deflecting mirror. Display Area The HUD size is approximately 200 mm x 100 mm with a display resolution of 480 x240 pixels.The HUD is separated into 2 display areas. The individual fields are "optically" separated in the image so that they can be identified more easily. The upper area shows navigation information and CC messages in the form of symbols, bar display and text. The lower area shows speed-related displays in the form of unit, current speed and cruise control. -r =o Index Explanation Index Explanation 1 LED array 5 Windshield 2 TFT projection display 6 Observer's point of vision 3 Plane mirror 7 Projected image 4 Curved mirror Index Explanation 1 Navigation/CC display area 2 Road speed/Cruise control display area E70 Head-Up Display Workbook 5 MOST Heads- up Display System Schematic Circuit Diagram 6 E70 Head-Up Display Workbook Heads- up Display System Schematic Circuit Diagram Legend Index Explanation Index Explanation 1 Light switch center 7 MOST station 2 Head-up display HUD K-CAN Body CAN 3 Instrument cluster MOST-Bus Media Oriented System Transport bus 4 Central Information Display CID LVDS Low Voltage Differential Signalling 5 M ulti-audio system controller Central Head unit And Multimedia Platform CHAMP CarCommunication ComputerCCC KL 30g Terminal 30g 6 Controller K-CAN and MOST Signals to the HUD Control Module In/out Information Source/sink Function In Road speed Instrument cluster Display in the HUD In Check control message Instrument cluster Display in the HUD In Dimming/brightness Rain and driving light sensor(RLS) via roof function center (FZD) Brightness adjustment In Height adjustment CHAMP, CCC Height adjustment In Brightness offset CHAMP, CCC Brightness adjustment In DCC EHB3 Display in the HUD In Function selection CHAMP, CCC What is displayed in the HUD In On/Off switch Light switch center (LZ) Switching the HUD On/Off In Navigation CHAMP, CCC Display in the HUD E70 Head-Up Display Workbook 7 8 E70 Head-Up Display Workbook Mirrors Unlike the previous system two mirrors, instead of four, are fitted in the head-up display to reflect the information onto the windshield surface. The convex mirror (1) is responsible for compensating the image on the windshield and forthe size and distance of the image. The flat mirror (2) is a deflecting mirror to keep the beam in the space provided. The convex mirror is made of plastic while the flat mirror is made of glass. Adjusting the Brightness The brightness of the HUD can be individually adjusted via the CID The brightness is adjusted as follows: • Call up the main menu by pressing the menu button • Press the Controller and select the "Settings" menu item • Turn the Controller until "Displays/Screen" is highlighted in the menu bar and then confirm by pressing the Controller; the upper menu bar is activated • Turn the Controller until "Head-up display brightness" is high¬ lighted in the upper bar and then confirm • Set the desired brightness by turning the Controller and con¬ firm by pressing. i ■ V F~| Head Up Display ► i> "V < Brightness / Position ► Brightness Piaure position - < Min Max Adjusting the Height of the Horizon To adjust the location of the image and the Eye box, the iDrive con¬ troller is used to move a stepper motor. The Eye box can be shifted up to a maximum of ± 30 mm upwards or downward. The height setting is adjusted as follows: • Call up the main menu by pressing the menu button • Press the Controller and select the "Settings" menu item • Turn the Controller until "Displays/Screen" is highlighted in the menu bar and then confirm by pressing the Controller; the upper menu bar is activated • Turn the Controller until "Position" is highlighted in the upper bar and then confirm • Set the desired height by turning the Controller and confirm by pressing. 4 I Head Up Display ► i 4 Brightness / Position ► Vertical Rotation of the HUD The HUD image can be rotated in the horizontal by a service tech¬ nician using the DIS (vertical rotation), after a replacing a wind¬ shield, for instance. Note: The vertical rotation is adjusted via a stepper motor in steps of 0.25° from -3° to +3° with the DIS. Detailed information may be found in the BMW diag¬ nostic system. Image Defects Incorrect installation of the HUD or of the windshield may result in faulty HUD projections. Some faults which may occur when the HUD orthe windshield are fitted are shown in the next page. Note: The HUD incorporates operating-hours counters for both the HUD and the LED array. When the HUD is replaced, the operating hours counter must be initialized to 0. Correcting Distortion (warping) S hould the image be distorted after a change of windshield, the image display can be improved using the Warping function. Warping is the technical term forthe improvement of the image display. a 160 „ n FRANKFURTER RING 500 m frANKfUrTer RING §00 n Trankfur RING 500m 160 Image 1 is compressed widthways. Image 2 is displayed twice. Images 3 and 4 are distorted. Note: Unlike the previous system, no special tools are needed to adjust the head-up display.Vertical (rota¬ tion) and distortion (warping) are corrected with the BMW diagnostic system. E70 Head-Up Display Workbook 9 10 E70 Head-Up Display Workbook Workshop Exercise - Head-Up Display Adjust the Head-Up Display What information can be displayed in the HUD? Which display settings can be changed via iDrive? Which display settings can be changed via the BMW Diagnosis System?_ How are the adjustments carried out by the HUD unit? Vertical _ Rotational _ Keystone/Trapezoidal_