WO2022162179A1 - Display device for vehicle and electronic device for vehicle - Google Patents

Display device for vehicle and electronic device for vehicle Download PDF

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Publication number
WO2022162179A1
WO2022162179A1 PCT/EP2022/052106 EP2022052106W WO2022162179A1 WO 2022162179 A1 WO2022162179 A1 WO 2022162179A1 EP 2022052106 W EP2022052106 W EP 2022052106W WO 2022162179 A1 WO2022162179 A1 WO 2022162179A1
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WO
WIPO (PCT)
Prior art keywords
lvds
error
module
vehicle
decoding module
Prior art date
Application number
PCT/EP2022/052106
Other languages
French (fr)
Inventor
Hao Li
Daohe YU
Original Assignee
Continental Automotive Technologies GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Continental Automotive Technologies GmbH filed Critical Continental Automotive Technologies GmbH
Publication of WO2022162179A1 publication Critical patent/WO2022162179A1/en

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Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/12—Test circuits or failure detection circuits included in a display system, as permanent part thereof

Definitions

  • the invention relates to the field of automobiles, specifically relates to a display device for a vehicle and electronic device for a vehicle.
  • the controller when an error or a fault occurs, the controller usually performs corresponding error handling or fault handling. For example, for a power supply fault, the corresponding processing is restarting; for a communication error, the corresponding processing is retransmitting; for a display fault, the corresponding processing is turning off backlight, etc.
  • Some display devices for a vehicle do not comprise a main controller, the display device itself cannot perform corresponding processing for an error or fault that occurs, thus requires an external controller to perform corresponding error handling or fault handling.
  • the problem to be solved by the invention is to provide a display device for a vehicle.
  • the external controller can be informed that an error or fault has occurred in the display device for a vehicle by reading a first control register and/or receiving an output signal of the first error output.
  • the external control can perform corresponding error handling or fault handling.
  • the invention provides a display device for a vehicle, wherein the display device for a vehicle comprises: a power supply module; a display screen; an LVDS decoding module, used for decoding a first video from an external controller and encoded by an external LVDS encoding module, and used for outputting a second video, wherein the LVDS decoding module is provided with a first control register and/or a first error output; and a display module, arranged between the LVDS decoding module and the display screen, used for processing the second video and transmitting the second video to the display screen for display; wherein the external controller can be informed that an error or fault has occurred in the display device for a vehicle by reading the first control register and/or receiving an output signal of the first error output.
  • the LVDS decoding module is connected to the external LVDS encoding module via LVDS, and the external controller sends an instruction to read data of the first control register of the LVDS decoding module via the IIC channel of the LVDS and can be informed that an error or fault has occurred in the LVDS decoding module.
  • the first error output of the LVDS decoding module is connected to a first input of the external controller, and when an error or fault has occurred in the LVDS decoding module, the first error output outputs a low level or a high level, the external controller detects the low level or the high level and can be informed that an error or fault has occurred in the LVDS decoding module.
  • the display module has a second control register and/or a second error output.
  • the LVDS decoding module is connected to the display module via an IIC bus, and the external controller reads data of the second control register by sending an instruction via an IIC channel of the LVDS, so that it can be informed that an error or fault has occurred in the display module.
  • the second error output is connected to the second input of the LVDS decoding module, the second error output outputs a low level or a high level when an error or fault has occurred in the display module, the LVDS decoding module detects the low level or the high level at the second input , and set the first control register to corresponding data, the external controller reads the data of the first control register by sending an instruction via the IIC channel of the LVDS, so that it can be informed that the error or fault has occurred in the display module.
  • the second error output is connected to a second input of the LVDS decoding module, when an error or fault has occurred in the display module , the second error output outputs a PWM signal, the frequency of the PWM signal corresponds to different errors or faults, the LVDS decoding module detects the PWM signal at the second input, the first error output of the LVDS decoding module outputs the PWM signal to the first input of the external controller, and the external controller can be informed that the error or fault has occurred in the display module.
  • the power supply module has a third error output
  • the third error output is connected to the third input of the LVDS decoding module, when an error or fault occurs in the power supply module, the third error output outputs a low level or a high level
  • the LVDS decoding module detects the low level or the high level at the third input, and sets the first control register of the LVDS decoding module to corresponding data
  • the external controller reads the data of the first control register by sending an instruction via the IIC channel of the LVDS, so that it can be informed that the error or the fault has occurred in the power supply module.
  • the invention also provides an electronic device for a vehicle, wherein the electronic device for a vehicle comprises a controller, an LVDS encoding module, and a display device for a vehicle as claimed in any one of claims 1 to 8, the LVDS encoding module is connected to the LVDS decoding module of the display device for a vehicle via LVDS.
  • the electronic device for a vehicle is an instrument cluster, an infotainment system, or a heads-up display.
  • the display device for a vehicle and the electronic device for a vehicle provided by the invention have following beneficial effect: the external controller can be informed that an error or fault has occurred in the display device for a vehicle by reading a first control register and/or receiving an output signal of the first error output; and the external control can perform corresponding error handling or fault handling.
  • Fig. 1 is a schematic diagram of an electronic device for a vehicle of an embodiment of the invention.
  • fig. 2 is a schematic diagram of an electronic device for a vehicle of another embodiment of the invention.
  • fig. 3 is a schematic diagram of an electronic device for a vehicle of a further embodiment of the invention.
  • fig. 4 is a schematic diagram of an electronic device for a vehicle of a further embodiment of the invention.
  • fig. 5 is a schematic diagram of an electronic device for a vehicle of a further embodiment of the invention.
  • fig. 6 is a schematic diagram of an electronic device for a vehicle of a further embodiment of the invention.
  • an electronic device for a vehicle can be an instrument cluster, an infotainment system, or a head-up display. In the embodiment, it is an instrument cluster.
  • the instrument cluster comprises a controller ExMCll, an LVDS encoding module ExENC and a display device for a vehicle DIS, wherein the LVDS encoding module ExENC is connected to the display device for a vehicle DIS via LVDS.
  • LVDS Low-Voltage Differential Signaling
  • the transmission technology can reach over 155Mbps.
  • the core of the LVDS technology is to adopt high-speed differential data transmission with extremely low voltage swing realizing point-to-point or point-to-multipoint connection.
  • the transmission medium of the LVDS technology can be a copper connecting wire in PCB or a balanced cable.
  • a display device DIS for a vehicle comprises: a power supply module PO; a display screen LCD; an LVDS decoding module DEC, used for decoding a first video VD1 from an external controller ExMCU and encoded by an external LVDS encoding module ExENC, and used for outputting a second video VD2, wherein the LVDS decoding module DEC is provided with a first error output POE1 , and a display module DM, arranged between the LVDS decoding module DEC and the display screen LCD, used for processing the second video VD2 and transmitting the second video VD2 to the display screen LCD for display.
  • the external encoding module ExENC corresponding to the LVDS decoding module DEC performs LVDS encoding on a video to be displayed, outputs the first video VD1 , and transmits to the LVDS decoding module DEC of the display device for a vehicle DIS via an LVDS link.
  • the LVDS decoding module DEC performs LVDS decoding on the received first video VD1 to obtain a second video VD2, and transmits the second video VD2 to the display module DM.
  • the second video VD2 is displayed on the display screen LCD after being processed.
  • the first error output POE1 of the LVDS decoding module DEC is connected to a first input PI1 of the external controller ExMCU.
  • the first error output POE1 outputs, for example a low level.
  • the external controller ExMCU detects the low level at the first input PI1 and can be informed that the error or fault has occurred in the LVDS decoding module DEC.
  • the first error output POE1 can also output a high level.
  • the external controller ExMCll can be informed that an error or fault has occurred in the LVDS decoding module DEC by receiving the output signal of the first error output POE1.
  • the LVDS decoding module DEC is a MAX96752F decoding chip.
  • the LVDS decoding module conforms to ASIL B.
  • the ERRB pin of the LVDS decoding module is the first error output POE1 . When the ERRB pin is at a low level, it indicates a data error, or an interrupt detected. That is, an error or fault has occurred in the LVDS decoding module DEC.
  • the external controller ExMCU can perform corresponding error processing, such as resetting the display device for a vehicle DIS, or the like.
  • the LVDS decoding module DEC has a first control register CR1 .
  • the data of a corresponding register in the first control register CR1 can be changed.
  • the external encoding module ExENC corresponding to the LVDS decoding module DEC performs LVDS encoding on the first video VD1 and the I2C instruction and transmits to the LVDS decoding module DEC via an LVDS link.
  • the LVDS decoding module DEC decodes the received LVDS signal to obtain a second video VD2 and I2C instruction.
  • the data of the first control register CR1 is transmitted to the external LVDS encoding module ExENC via a backward channel of LVDS, and further transmitted to the external controller ExMCU.
  • the external controller ExMCU can communicate with the LVDS decoding module DEC via I2C, where the external encoding module ExENC is the master device and the LVDS decoding module DEC is the slave device. If the I2C instruction decoded is sent to itself, the LVDS decoding module DEC carries out corresponding processing according to the instruction. If not, an I2C instruction signal is sent on the I2C bus.
  • the data in the registers in the first control register CR1 is transmitted via the backward channel of LVDS. So that the external encoding module ExENC receives the data in the registers in the first control register CR1 and further transmits the data to the external controller ExMCU. By analyzing the data, the external controller ExMCU can be informed that the LVDS decoding module DEC has a data error or an interrupt detected. The data in different registers of the first control register CR1 represents different data errors or interrupts. So that the external controller ExMCU can be informed which data error has occurred or which interrupt has been detected in the LVDS decoding module DEC.
  • the LVDS decoding module DEC has a first control register CR1 and a first error output POE1 .
  • the first error output POE1 is connected to the first input PI1 of the external controller ExMCU.
  • the first error output POE1 outputs, for example, a low level when the LVDS decoding module DEC has a data error or an interrupt detected.
  • the external controller ExMCU detects a low level at the first input PI1 , so that it can be informed that an error or fault has occurred in the LVDS decoding module DEC.
  • the external controller ExMCU can send an I2C instruction to read the data in the first control register CR1 . Then by analyzing the data, the external controller ExMCU can determine which data error occurs or which interrupt is detected in the LVDS decoding module DEC and can perform corresponding error handling or fault handling.
  • the LVDS encoding module DEC detects that a freeze frame (the same frame is transmitted all the time) occurs in the video VD1 transmitted by the external LVDS encoding module ExENC.
  • the external controller ExMCll reads the data of the first control register CR1 by sending an I2C instruction and can be informed that the freeze frame occurs.
  • the external controller ExMCll can control the external LVDS encoding module ExENC to restart or perform other processing, so that the instrument cluster can operate normally.
  • the display module DM has a second error output POE2. If the display module DM has an error or a fault, the second error output POE2 outputs, for example, a low level. In other embodiments, the second error output POE2 can also output a high level.
  • the second error output POE2 is connected to a second input PI2 of the LVDS decoding module DEC. If the LVDS decoding module DEC detects a low level at the second input PI2, the data in the first control register CR1 of the LVDS decoding module DEC is changed accordingly, and the first error output POE1 may also output a low level.
  • the external controller ExMCU reads the data in the first control register CR1 , analyzes the data, and determines that the PI2 interrupt port of the LVDS decoding module DEC is interrupted, thereby the external controller ExMCU is informed that the error or fault has occurred in the display module DM.
  • the display module DM may detect that the second video VD2 output by the LVDS decoding module DEC is frozen. When the external controller ExMCU is informed that the second video VD2 is frozen and restart the display device DIS to make it operate normally. If it is restarted, the display module DM still cannot work normally, the external controller ExMCU can turn off the backlight of the display screen LCD to prompt the user.
  • the display module DM has a second error output POE2, and if the display module DM has an error or a fault, the second error output POE2 outputs, for example, a PWM signal.
  • the second error output POE2 is connected to a second input PI2 of the LVDS decoding module DEC, and the second error output POE2 outputs a PWM signal whose frequency corresponds to different errors or faults.
  • the LVDS decoding module DEC detects the PWM signal at the second input PI2, and the first error output POE1 of the LVDS decoding module DEC outputs the PWM signal to the first input terminal PI1 of the external controller ExMCU.
  • the external controller ExMCU is informed which error or fault occurs in the display module DM by means of the frequency of the PWM signal and may perform corresponding error handling or fault handling. So that the display device for a vehicle DIS can operate normally.
  • the display module DM has a second control register CR2.
  • the data in the corresponding register in the second control register CR2 is changed.
  • the LVDS decoding module DEC is connected to the same I2C bus as the display module DM, both of which are slave devices.
  • the LVDS decoding module DEC If the I2C data decoded by the LVDS decoding module DEC is not sent to itself, namely the receiving address of the data does not match with the address of itself (the LVDS decoding module DEC), the LVDS decoding module DEC sends the I2C data to the I2C bus.
  • the display module DM detects that the receiving address of the I2C data matches the address of itself (display module DM), and receives the I2C data.
  • the I2C data is an instruction for reading the second control register CR2.
  • the data of the second control register CR2 is transmitted to the PI2C of the LVDS decoding module DEC via the I2C bus.
  • the data of the second control register CR2 is transmitted to the external LVDS encoding module ExENC via the backward channel of LVDS after being processed by the LVDS decoding module DEC, and is further transmitted to the external controller ExMCll, which is informed which error or fault occurs in the display module DM.
  • the display module DM has both a second control register CR2 and a second error output POE2, which is connected to a second input PI2 of the LVDS decoding module DEC.
  • the external controller ExMCll sends I2C data (reading the second control register CR2) to obtain the data of the register in the second control register CR2, and by analyzing the data, it is clear which error or fault has occurred in the display module DM.
  • the power supply module PO has a third error output POE3, which is connected to a third input PI3 of the LVDS decoding module DEC.
  • the third input PI3 is an interrupt port when the interrupt signal at the third input PI3 is active.
  • the second error output port POE2 is, for example, a valid interrupt signal.
  • the data in the first control register CR1 of the LVDS decoding module DEC changes accordingly.
  • the external controller ExMCU obtains the data of the first control register CR1 . By analyzing, if the data indicates that the third input port PI3 is interrupted, the external controller ExMCU can be informed that the power supply module PO has a fault.

Abstract

The invention provides a display device for a vehicle, wherein the display device for a vehicle comprises: a power supply module; a display screen; an LVDS decoding module, used for decoding a first video from an external controller and encoded by an external LVDS encoding module, and used for outputting a second video, wherein the LVDS decoding module is provided with a first control register and/or a first error output; and a display module, arranged between the LVDS decoding module and the display screen, used for processing the second video and transmitting the second video to the display screen for display; wherein the external controller can be informed that an error or fault has occurred in the display device for a vehicle by reading the first control register and/or receiving an output signal of the first error output. The display device for a vehicle and the electronic device for a vehicle provided by the invention have following beneficial effect: the external controller can be informed that an error or fault has occurred in the display device for a vehicle by reading a first control register and/or receiving an output signal of the first error output; and the external control can perform corresponding error handling or fault handling.

Description

Description
Display device for a vehicle and electronic device for a vehicle
Technical Field
The invention relates to the field of automobiles, specifically relates to a display device for a vehicle and electronic device for a vehicle.
Background
For an in-vehicle display device, when an error or a fault occurs, the controller usually performs corresponding error handling or fault handling. For example, for a power supply fault, the corresponding processing is restarting; for a communication error, the corresponding processing is retransmitting; for a display fault, the corresponding processing is turning off backlight, etc.
Some display devices for a vehicle do not comprise a main controller, the display device itself cannot perform corresponding processing for an error or fault that occurs, thus requires an external controller to perform corresponding error handling or fault handling.
Summary
The problem to be solved by the invention is to provide a display device for a vehicle. The external controller can be informed that an error or fault has occurred in the display device for a vehicle by reading a first control register and/or receiving an output signal of the first error output. The external control can perform corresponding error handling or fault handling.
The invention provides a display device for a vehicle, wherein the display device for a vehicle comprises: a power supply module; a display screen; an LVDS decoding module, used for decoding a first video from an external controller and encoded by an external LVDS encoding module, and used for outputting a second video, wherein the LVDS decoding module is provided with a first control register and/or a first error output; and a display module, arranged between the LVDS decoding module and the display screen, used for processing the second video and transmitting the second video to the display screen for display; wherein the external controller can be informed that an error or fault has occurred in the display device for a vehicle by reading the first control register and/or receiving an output signal of the first error output.
Further, the LVDS decoding module is connected to the external LVDS encoding module via LVDS, and the external controller sends an instruction to read data of the first control register of the LVDS decoding module via the IIC channel of the LVDS and can be informed that an error or fault has occurred in the LVDS decoding module.
Further, the first error output of the LVDS decoding module is connected to a first input of the external controller, and when an error or fault has occurred in the LVDS decoding module, the first error output outputs a low level or a high level, the external controller detects the low level or the high level and can be informed that an error or fault has occurred in the LVDS decoding module.
Further, the display module has a second control register and/or a second error output.
Further, the LVDS decoding module is connected to the display module via an IIC bus, and the external controller reads data of the second control register by sending an instruction via an IIC channel of the LVDS, so that it can be informed that an error or fault has occurred in the display module. Further, the second error output is connected to the second input of the LVDS decoding module, the second error output outputs a low level or a high level when an error or fault has occurred in the display module, the LVDS decoding module detects the low level or the high level at the second input , and set the first control register to corresponding data, the external controller reads the data of the first control register by sending an instruction via the IIC channel of the LVDS, so that it can be informed that the error or fault has occurred in the display module.
Further, the second error output is connected to a second input of the LVDS decoding module, when an error or fault has occurred in the display module , the second error output outputs a PWM signal, the frequency of the PWM signal corresponds to different errors or faults, the LVDS decoding module detects the PWM signal at the second input, the first error output of the LVDS decoding module outputs the PWM signal to the first input of the external controller, and the external controller can be informed that the error or fault has occurred in the display module.
Further, the power supply module has a third error output, the third error output is connected to the third input of the LVDS decoding module, when an error or fault occurs in the power supply module, the third error output outputs a low level or a high level, the LVDS decoding module detects the low level or the high level at the third input, and sets the first control register of the LVDS decoding module to corresponding data, the external controller reads the data of the first control register by sending an instruction via the IIC channel of the LVDS, so that it can be informed that the error or the fault has occurred in the power supply module.
The invention also provides an electronic device for a vehicle, wherein the electronic device for a vehicle comprises a controller, an LVDS encoding module, and a display device for a vehicle as claimed in any one of claims 1 to 8, the LVDS encoding module is connected to the LVDS decoding module of the display device for a vehicle via LVDS.
Further, the electronic device for a vehicle is an instrument cluster, an infotainment system, or a heads-up display. Compared with the prior art, the display device for a vehicle and the electronic device for a vehicle provided by the invention have following beneficial effect: the external controller can be informed that an error or fault has occurred in the display device for a vehicle by reading a first control register and/or receiving an output signal of the first error output; and the external control can perform corresponding error handling or fault handling.
Brief Description of the Drawings
Fig. 1 is a schematic diagram of an electronic device for a vehicle of an embodiment of the invention. fig. 2 is a schematic diagram of an electronic device for a vehicle of another embodiment of the invention. fig. 3 is a schematic diagram of an electronic device for a vehicle of a further embodiment of the invention. fig. 4 is a schematic diagram of an electronic device for a vehicle of a further embodiment of the invention. fig. 5 is a schematic diagram of an electronic device for a vehicle of a further embodiment of the invention. fig. 6 is a schematic diagram of an electronic device for a vehicle of a further embodiment of the invention.
Detailed Description
As shown in fig. 1 , an electronic device for a vehicle an embodiment of the invention can be an instrument cluster, an infotainment system, or a head-up display. In the embodiment, it is an instrument cluster.
The instrument cluster comprises a controller ExMCll, an LVDS encoding module ExENC and a display device for a vehicle DIS, wherein the LVDS encoding module ExENC is connected to the display device for a vehicle DIS via LVDS. LVDS (Low-Voltage Differential Signaling) is a differential signaling technology with low power consumption, low error rate, low crosstalk, and low radiation. The transmission technology can reach over 155Mbps. The core of the LVDS technology is to adopt high-speed differential data transmission with extremely low voltage swing realizing point-to-point or point-to-multipoint connection. The transmission medium of the LVDS technology can be a copper connecting wire in PCB or a balanced cable.
A display device DIS for a vehicle comprises: a power supply module PO; a display screen LCD; an LVDS decoding module DEC, used for decoding a first video VD1 from an external controller ExMCU and encoded by an external LVDS encoding module ExENC, and used for outputting a second video VD2, wherein the LVDS decoding module DEC is provided with a first error output POE1 , and a display module DM, arranged between the LVDS decoding module DEC and the display screen LCD, used for processing the second video VD2 and transmitting the second video VD2 to the display screen LCD for display.
The external encoding module ExENC corresponding to the LVDS decoding module DEC performs LVDS encoding on a video to be displayed, outputs the first video VD1 , and transmits to the LVDS decoding module DEC of the display device for a vehicle DIS via an LVDS link. The LVDS decoding module DEC performs LVDS decoding on the received first video VD1 to obtain a second video VD2, and transmits the second video VD2 to the display module DM. The second video VD2 is displayed on the display screen LCD after being processed.
In this embodiment, the first error output POE1 of the LVDS decoding module DEC is connected to a first input PI1 of the external controller ExMCU. When the LVDS decoding module DEC has an error or a fault, the first error output POE1 outputs, for example a low level. The external controller ExMCU detects the low level at the first input PI1 and can be informed that the error or fault has occurred in the LVDS decoding module DEC. In other embodiments, the first error output POE1 can also output a high level.
The external controller ExMCll can be informed that an error or fault has occurred in the LVDS decoding module DEC by receiving the output signal of the first error output POE1.
Specifically, in this embodiment, the LVDS decoding module DEC is a MAX96752F decoding chip. The LVDS decoding module conforms to ASIL B. The ERRB pin of the LVDS decoding module is the first error output POE1 . When the ERRB pin is at a low level, it indicates a data error, or an interrupt detected. That is, an error or fault has occurred in the LVDS decoding module DEC.
At this time, the external controller ExMCU can perform corresponding error processing, such as resetting the display device for a vehicle DIS, or the like.
In another embodiment, as shown in fig. 2, the LVDS decoding module DEC has a first control register CR1 . When the LVDS decoding module DEC has a data error or an interrupt detected, the data of a corresponding register in the first control register CR1 can be changed.
The external encoding module ExENC corresponding to the LVDS decoding module DEC performs LVDS encoding on the first video VD1 and the I2C instruction and transmits to the LVDS decoding module DEC via an LVDS link. The LVDS decoding module DEC decodes the received LVDS signal to obtain a second video VD2 and I2C instruction. The data of the first control register CR1 is transmitted to the external LVDS encoding module ExENC via a backward channel of LVDS, and further transmitted to the external controller ExMCU.
In this way, the external controller ExMCU can communicate with the LVDS decoding module DEC via I2C, where the external encoding module ExENC is the master device and the LVDS decoding module DEC is the slave device. If the I2C instruction decoded is sent to itself, the LVDS decoding module DEC carries out corresponding processing according to the instruction. If not, an I2C instruction signal is sent on the I2C bus.
For the LVDS decoding module DEC (MAX96752F decoding chip), if the I2C instruction is to read the first control register CR1 , the data in the registers in the first control register CR1 is transmitted via the backward channel of LVDS. So that the external encoding module ExENC receives the data in the registers in the first control register CR1 and further transmits the data to the external controller ExMCU. By analyzing the data, the external controller ExMCU can be informed that the LVDS decoding module DEC has a data error or an interrupt detected. The data in different registers of the first control register CR1 represents different data errors or interrupts. So that the external controller ExMCU can be informed which data error has occurred or which interrupt has been detected in the LVDS decoding module DEC.
In a further embodiment, as shown in fig. 3, the LVDS decoding module DEC has a first control register CR1 and a first error output POE1 . The first error output POE1 is connected to the first input PI1 of the external controller ExMCU. The first error output POE1 outputs, for example, a low level when the LVDS decoding module DEC has a data error or an interrupt detected. The external controller ExMCU detects a low level at the first input PI1 , so that it can be informed that an error or fault has occurred in the LVDS decoding module DEC.
If it needs to determine which data error occurs or which interrupt is detected in the LVDS decoding module DEC, the external controller ExMCU can send an I2C instruction to read the data in the first control register CR1 . Then by analyzing the data, the external controller ExMCU can determine which data error occurs or which interrupt is detected in the LVDS decoding module DEC and can perform corresponding error handling or fault handling.
For example, the LVDS encoding module DEC detects that a freeze frame (the same frame is transmitted all the time) occurs in the video VD1 transmitted by the external LVDS encoding module ExENC. The external controller ExMCll reads the data of the first control register CR1 by sending an I2C instruction and can be informed that the freeze frame occurs. The external controller ExMCll can control the external LVDS encoding module ExENC to restart or perform other processing, so that the instrument cluster can operate normally.
In a further embodiment, as shown in fig. 4, the display module DM has a second error output POE2. If the display module DM has an error or a fault, the second error output POE2 outputs, for example, a low level. In other embodiments, the second error output POE2 can also output a high level.
The second error output POE2 is connected to a second input PI2 of the LVDS decoding module DEC. If the LVDS decoding module DEC detects a low level at the second input PI2, the data in the first control register CR1 of the LVDS decoding module DEC is changed accordingly, and the first error output POE1 may also output a low level.
In this way, the external controller ExMCU reads the data in the first control register CR1 , analyzes the data, and determines that the PI2 interrupt port of the LVDS decoding module DEC is interrupted, thereby the external controller ExMCU is informed that the error or fault has occurred in the display module DM.
For example, the display module DM may detect that the second video VD2 output by the LVDS decoding module DEC is frozen. When the external controller ExMCU is informed that the second video VD2 is frozen and restart the display device DIS to make it operate normally. If it is restarted, the display module DM still cannot work normally, the external controller ExMCU can turn off the backlight of the display screen LCD to prompt the user.
In a further embodiment, as shown in fig. 4, the display module DM has a second error output POE2, and if the display module DM has an error or a fault, the second error output POE2 outputs, for example, a PWM signal. The second error output POE2 is connected to a second input PI2 of the LVDS decoding module DEC, and the second error output POE2 outputs a PWM signal whose frequency corresponds to different errors or faults.
The LVDS decoding module DEC detects the PWM signal at the second input PI2, and the first error output POE1 of the LVDS decoding module DEC outputs the PWM signal to the first input terminal PI1 of the external controller ExMCU.
In this way, the external controller ExMCU is informed which error or fault occurs in the display module DM by means of the frequency of the PWM signal and may perform corresponding error handling or fault handling. So that the display device for a vehicle DIS can operate normally.
In a further embodiment, as shown in fig. 5, the display module DM has a second control register CR2. When a data error occurs or an interrupt is detected in the display module DM, the data in the corresponding register in the second control register CR2 is changed.
The LVDS decoding module DEC is connected to the same I2C bus as the display module DM, both of which are slave devices.
If the I2C data decoded by the LVDS decoding module DEC is not sent to itself, namely the receiving address of the data does not match with the address of itself (the LVDS decoding module DEC), the LVDS decoding module DEC sends the I2C data to the I2C bus. The display module DM detects that the receiving address of the I2C data matches the address of itself (display module DM), and receives the I2C data.
The I2C data is an instruction for reading the second control register CR2. The data of the second control register CR2 is transmitted to the PI2C of the LVDS decoding module DEC via the I2C bus. The data of the second control register CR2 is transmitted to the external LVDS encoding module ExENC via the backward channel of LVDS after being processed by the LVDS decoding module DEC, and is further transmitted to the external controller ExMCll, which is informed which error or fault occurs in the display module DM.
In a further embodiment, as shown in fig. 6, the display module DM has both a second control register CR2 and a second error output POE2, which is connected to a second input PI2 of the LVDS decoding module DEC. After it is informed that the display module DM has an error or a fault, the external controller ExMCll sends I2C data (reading the second control register CR2) to obtain the data of the register in the second control register CR2, and by analyzing the data, it is clear which error or fault has occurred in the display module DM.
In a further embodiment, as shown in fig. 6, the power supply module PO has a third error output POE3, which is connected to a third input PI3 of the LVDS decoding module DEC. The third input PI3 is an interrupt port when the interrupt signal at the third input PI3 is active.
When the display module DM has an error and/or a failure, the second error output port POE2 is, for example, a valid interrupt signal. The data in the first control register CR1 of the LVDS decoding module DEC changes accordingly. The external controller ExMCU obtains the data of the first control register CR1 . By analyzing, if the data indicates that the third input port PI3 is interrupted, the external controller ExMCU can be informed that the power supply module PO has a fault.
Although the present invention has been described with reference to the preferred embodiments, the present invention is not limited thereto. Various changes and modifications can be made by skilled in the art without departing from the spirit and scope of the invention, and the scope of the invention is to be determined by the claims.

Claims

Patent claims
1 . A display device for a vehicle, wherein the display device for a vehicle comprises: a power supply module; a display screen; an LVDS decoding module, used for decoding a first video from an external controller and encoded by an external LVDS encoding module, and used for outputting a second video, wherein the LVDS decoding module is provided with a first control register and/or a first error output; and a display module, arranged between the LVDS decoding module and the display screen, used for processing the second video and transmitting the second video to the display screen for display; wherein the external controller can be informed that an error or fault has occurred in the display device for a vehicle by reading the first control register and/or receiving an output signal of the first error output.
2. The display device for a vehicle as claimed in claim 1 , wherein the LVDS decoding module is connected to the external LVDS encoding module via LVDS, and the external controller sends an instruction to read data of the first control register of the LVDS decoding module via the IIC channel of the LVDS and can be informed that an error or fault has occurred in the LVDS decoding module.
3. The display device for a vehicle as claimed in claim 1 , wherein the first error output of the LVDS decoding module is connected to a first input of the external controller, and when an error or fault has occurred in the LVDS decoding module, the first error output outputs a low level or a high level, the external controller detects the low level or the high level and can be informed that an error or fault has occurred in the LVDS decoding module.
4. The display device for a vehicle as claimed in claim 1 , wherein the display module has a second control register and/or a second error output.
5. The display device for a vehicle as claimed in claim 4, wherein the LVDS decoding module is connected to the display module via an IIC bus, and the external controller reads data of the second control register by sending an instruction via an IIC channel of the LVDS, so that it can be informed that an error or fault has occurred in the display module.
6. The display device for a vehicle as claimed in claim 4, wherein the second error output is connected to the second input of the LVDS decoding module, the second error output outputs a low level or a high level when an error or fault has occurred in the display module, the LVDS decoding module detects the low level or the high level at the second input , and set the first control register to corresponding data, the external controller reads the data of the first control register by sending an instruction via the IIC channel of the LVDS, so that it can be informed that the error or fault has occurred in the display module.
7. The display device for a vehicle as claimed in claim 4, wherein the second error output is connected to a second input of the LVDS decoding module, when an error or fault has occurred in the display module , the second error output outputs a PWM signal, the frequency of the PWM signal corresponds to different errors or faults, the LVDS decoding module detects the PWM signal at the second input, the first error output of the LVDS decoding module outputs the PWM signal to the first input of the external controller, and the external controller can be informed that the error or fault has occurred in the display module.
8. The display device for a vehicle as claimed in claim 1 , wherein the power supply module has a third error output, the third error output is connected to the third input of the LVDS decoding module, when an error or fault occurs in the power supply module, the third error output outputs a low level or a high level, the LVDS decoding module detects the low level or the high level at the third input, and sets the first control register of the LVDS decoding module to corresponding data, the external controller reads the data of the first control register by sending an instruction via the IIC channel of the LVDS, so that it can be informed that the error or the fault has occurred in the power supply module.
9. An electronic device for a vehicle, wherein the electronic device for a vehicle comprises a controller, an LVDS encoding module, and a display device for a vehicle as claimed in any one of claims 1 to 8, the LVDS encoding module is connected to the LVDS decoding module of the display device for a vehicle via LVDS.
10. The electronic device for a vehicle as claimed in claim 9, wherein the electronic device for a vehicle is an instrument cluster, an infotainment system, or a heads-up display.
PCT/EP2022/052106 2021-01-29 2022-01-28 Display device for vehicle and electronic device for vehicle WO2022162179A1 (en)

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CN115946632A (en) * 2023-01-10 2023-04-11 润芯微科技(江苏)有限公司 Multi-screen display central control entertainment system and display method

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US20180240397A1 (en) * 2017-02-20 2018-08-23 Seiko Epson Corporation Driver, electro-optical device, and electronic apparatus

Patent Citations (1)

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Publication number Priority date Publication date Assignee Title
US20180240397A1 (en) * 2017-02-20 2018-08-23 Seiko Epson Corporation Driver, electro-optical device, and electronic apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115946632A (en) * 2023-01-10 2023-04-11 润芯微科技(江苏)有限公司 Multi-screen display central control entertainment system and display method
CN115946632B (en) * 2023-01-10 2023-08-18 润芯微科技(江苏)有限公司 Multi-screen display central control entertainment system and display method

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