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DE-102024133307-B3 - Display device with at least two display units

DE102024133307B3DE 102024133307 B3DE102024133307 B3DE 102024133307B3DE-102024133307-B3

Abstract

A display device is provided which is designed to be installed in a motor vehicle, comprising a first display unit which is substantially integrated into a second display unit, wherein the first display unit preferably uses a different method for displaying information than the second display unit, and wherein the first display unit and the second display unit can be supplied by a supply voltage, and wherein the first display unit has a logic circuit, and wherein the logic circuit is configured to monitor a change in at least one bus signal and, in particular, the loss of at least one bus signal, and, depending on this, to output a message on the first display unit, and wherein the first display unit has a power supply and can additionally be supplied by it.

Inventors

  • Yusuf Grottenthaler
  • Laurenz Tippe

Assignees

  • BAYERISCHE MOTOREN WERKE AKTIENGESELLSCHAFT

Dates

Publication Date
20260513
Application Date
20241114

Claims (9)

  1. A display device (AV) designed to be installed in a motor vehicle, comprising a first display unit (AE1) which is substantially integrated into a second display unit (AE2), wherein the first display unit preferably uses a different method for displaying information than the second display unit (AE2), and wherein the first display unit (AE1) and the second display unit (AE2) can be supplied by a supply voltage (VS), and wherein the first display unit (AE1) comprises a logic circuit (LS), wherein the logic circuit (LS) is configured to monitor a bus signal (BS) and, in particular, the loss of at least one bus signal (BS) and, depending thereon, to output a message on the first display unit, and wherein the first display unit (AE1) has a power supply (S) and can additionally be supplied by it.
  2. Display device according to Claim 1 , wherein the voltage supply (S) of the first display unit is in particular a buffer storage device, and wherein the voltage supply (S) is designed to supply the first display unit (AE1) when the supply voltage (VS) fails.
  3. Display device according to Claim 1 or 2 , wherein the first display unit (AE1) continues to display information for a limited time even after the supply voltage (VS) is switched off, in particular based on an effect of image persistence in LCD technology.
  4. Display device according to one of the preceding claims, wherein the logic circuit (LS) outputs the message (H) on the first display unit when the supply voltage (VS) fails and/or the at least one bus signal (BS) fails and/or an undervoltage is detected at the first display unit.
  5. Display device according to one of the preceding claims, wherein the first display unit (AE1) uses a method for displaying information which allows a persistent display of the message (H) even without a power supply (S).
  6. Display device according to one of the preceding claims, wherein the first display unit (AE1) uses a predetermined area of the second display unit to display the note (H).
  7. Display device according to one of the preceding claims, wherein the first display unit (AE1) uses an E-Ink technology to display the note (H).
  8. Display device according to one of the preceding claims, wherein the power supply (S) of the first display unit has an additional Low voltage power supply, such as a battery or a capacitor.
  9. Display device according to one of the preceding claims, wherein the first display unit (AE1) displays the message (H) in the event of a crash, wherein the bus signal (BS) is a crash signal.

Description

The present invention relates to a display device that can be installed in a motor vehicle. In particular, it relates to a display device that can continue to display important information in safety-critical situations, even if the main power supply in the vehicle has failed. Conventional display systems in motor vehicles typically consist of one or more display units powered by the vehicle's electrical system. These display units serve to present the driver and passengers with a wide range of information regarding the vehicle's status, the driving situation, and warnings. Normally, these display devices function reliably as long as the vehicle's electrical system is powered. However, if the electrical system fails in critical driving situations, for example due to a broken cable or a defect in the alternator/battery, the display units will also fail. In such cases, important warnings or information for the driver may no longer be displayed. This can significantly impair driving safety, as the driver is no longer informed about the vehicle's condition and potential hazards. To address this problem, there is a need for a display device that can continue to provide important information to the driver even in the event of a failure of the on-board power supply. The present invention provides a solution according to the independent claim. Further developments of the invention are the subject of the dependent claims. A display device is provided which is designed to be installed in a motor vehicle, comprising a first display unit which is substantially integrated into a second display unit, wherein the first display unit preferably uses a different method for displaying information than the second display unit, and wherein the first display unit and the second display unit can be supplied by a supply voltage, and wherein the first display unit has a logic circuit, and wherein the logic circuit is configured to monitor a change in at least one bus signal and in particular the loss of at least one bus signal, and wherein the first display unit has a power supply and can additionally be supplied by it. The power supply for the first display unit can be a buffer memory. The power supply can be designed to power the first display unit even if the main supply voltage fails. The power supply can be a battery or a capacitor. The first display unit can show the message when the supply voltage is lost, particularly based on an effect of image persistence in LCD technology. The logic circuit can output the message on the first display unit if the supply voltage fails and/or at least one bus signal fails and/or an undervoltage is detected at the first display unit. The first display unit can use a method for displaying information that allows persistent display of the message even without a power supply. The first display unit can use a specific area of the second display unit to show the message. The first display unit can use E-Ink technology to display the message. The first display unit can show the warning in case of a crash, where the bus signal is a crash signal. The invention is now also described with regard to the figures. They show: 1a and 1b schematically a display device according to the invention. The invention relates to a display device that can be installed in a motor vehicle. The display device comprises a first display unit that is at least partially integrated into a second display unit. The first display unit preferably uses a different method for displaying information than the second display unit. Both display units, i.e., the first and the second, can be powered by a single supply voltage. Additionally, the first display unit has its own power supply, which can be used to provide supplemental power. This supplemental power supply can be, for example, a buffer storage device such as a battery (e.g., a button cell), an accumulator, and/or a capacitor. In an advantageous embodiment of the invention, the first display unit is provided with a logic circuit. This logic circuit is configured to monitor a bus signal and, in particular, the loss of a bus signal. Depending on a change in the bus signal and/or the loss of the bus signal, the logic circuit can output a message on the first display unit. If, for example, the supply voltage or the bus signal fails, the logic circuit can display a corresponding message on the first display unit. The first display unit is preferably designed to allow the message to be displayed even without an applied voltage. E-Ink technology is particularly well-suited for this purpose, but LCD technology can also be used due to the image persistence effect. A further advantage of the invention is that the first display unit is designed to display safety-critical information when the supply voltage and/or the bus signal fails. For this purpose, it preferably uses a specific area of the second display unit. By using an additional low-voltage power supply, the first display unit can