KR20120117673A - Display device for motor vehicle - Google Patents

Abstract

PURPOSE: A display device for a vehicle is provided to perform high flexibility and an improved image display. CONSTITUTION: A display device(1) for a vehicle is composed to supply a single view mode and a dual and split view mode. The single view mode displays a single image accurately. The dual and split view mode displays two or more separate images at the same time.

Description

[0001] Display device for motor vehicle [

The present invention relates to a display device for a vehicle according to the preamble of claim 1.

DE 102008026565 B3 discloses a method and apparatus for considering the influence of ambient light on an image providing system. In this case, a black measurement is performed in the image providing system in order to determine a correction value considering the influence of ambient light.

Display devices having so-called dual-view technology or split-view technology in the automotive field are known in the prior art and have become commonplace in the meantime. This dual-view display, known in the prior art, allows two different images, such as vehicle settings, information, video, etc., to be displayed simultaneously on one monitor or on one display and viewed separately from different views. This allows, for example, the driver to view the navigation display from that time on the display, while the passenger can view the video film on the same display. A monitor that displays only one image operates in a so-called single-view mode.

In such a dual-view display device, the lowest possible crosstalk must be obtained. That is, the mutual influence of the two images to be displayed must be kept as low as optically possible.

It is an object of the present invention to provide a display device for an automobile which displays images such as, for example, vehicle settings, information, video and the like, which enable high flexibility and improved image display.

The above object is achieved by the features of claim 1 in an automotive display device of the above-described type. The preferred embodiments and improvements of the present invention are possible by the measures set out in the dependent claims.

The display device for a car according to the present invention is characterized in that the display device is a dual-split-view mode in which at least two images that can be separately viewed from different viewing directions as well as a single-view mode in which the driver and passenger view the same image And a display is provided.

Since the display device according to the present invention can provide two display modes: a single-view mode displaying exactly one image and a dual-view mode or a split-view mode capable of simultaneously displaying at least two images , Optimized for high contrast, or optimized for low crosstalk. Because the single-view operation is used more often, this application is particularly desirable due to the higher image contrast. At the same time, higher flexibility is achieved because the display device according to the invention can be used much more.

Control, i.e. control and / or regulation of the display device can be implemented by the control unit. The control unit may be, for example, a microcontroller.

Preferably, the control unit is configured to switch the display of the display device from a single-view mode to a dual or split-view mode or vice versa. Thereby, two operation modes can be used as needed. This possibility of conversion can further improve flexibility. Additional cost savings can also be achieved since the cost of other display devices in a dual-view display can be reduced by default. For example, since there is no need for two display devices, one display device for the driver and one display device for the passenger or for the passenger of the rear seat, for example, the place in the vehicle can be further saved.

As described above, in a dual-view display, crosstalk should be kept as low as possible. To this end, for example, a correction device for setting and / or correcting crosstalk may be provided. This correction device can, for example, carry out correction of the transmitted image data and the correction can result in incomplete separation of the two images to be displayed, thus improving the double display.

Also, with respect to crosstalk correction, there is a problem in a dual-view display that sometimes this can not be corrected in further optical coupling into a black image, because the black level can not be subtracted from the displayed black level. For example, in the case of a color display, a color gamut including primary colors is used in the display, the primary colors can be displayed in corresponding gray shades, and mixed colors are formed from primary colors as needed.

These color regions are given as RGB-regions in which, for example, primary colors and red cyan are used, and the primary colors may be given as gray levels or brightness of 0 to 255. [ Crosstalk correction is achieved by reducing the gray level of the adjacent image. For example, a relatively bright image (e.g., a video film) may be given in the passenger image while the driver image is mostly black image. In the case of an absolutely black display, for example REG-gray level = (0/0/0), a digital reduction of the luminance is no longer possible because the value range for the permissible gray level is in the range & It is because. Correction can be made when the so-called black level increase is performed. Mathematically, the black level increases to a higher gray level. That is, it increases mathematically from (0/0/0) to (2/2/2). As a result, it is possible to correct by two gray levels (crosstalk correction) in this embodiment as much as the black level was previously increased by the corresponding number of gray levels.

However, this black level increase basically reduces image contrast. The following equation holds:

Where L is the optical density of the corresponding luminance value, and K is the image contrast. The optical density L is expressed as a function of gray level, and the value of the function is indicated in parentheses after L. [ S indicates an increase in black level from the gray level indicated in the parentheses after it. In this embodiment, the black level with gray level 0 is digitally increased by two. That is, S (0) = 2.

The control, that is, the control and / or the adjustment of the correction device can be done by the control unit. For example, the control unit may be configured to activate or deactivate the correction device. Overall, the control unit can switch between single-view mode and dual-view mode or split-view mode. Further, simultaneously with the corresponding switching from the single-view mode to the dual or split-view mode, it is possible for the correction device to be switched automatically by the control unit, so that the image optimization corresponding to each mode is achieved.

For example, optimization of image contrast may be assigned in a single-view mode, while in a dual-view mode or a split-view mode, the correction device provides very low crosstalk. Basically, it is also possible for the correction device to perform other image correction in some cases. For example, the correction device may be configured to perform the desired image correction in the single-view mode and the dual-view mode.

The display quality of the image displayed on the display depends on the ambient luminance. The ambient luminance depends, for example, on whether it is day or night. Of course, there are also a series of other influence factors that affect the ambient brightness. For example, it is also possible for the driver to connect the internal illumination of the vehicle. All possible effects of the exterior of the car and the interior of the car can affect the ambient brightness. To take the ambient luminance into consideration, it is possible to provide an optical sensor which preferably detects the ambient luminance. Also, by connecting the optical sensor to the control unit, the control unit can use the corresponding detection or measurement data of the optical sensor. This can be used, for example, to control a display device or a correction device such that the luminance or contrast or crosstalk is adjusted to the corresponding ambient luminance. It is particularly preferred in this embodiment that the corresponding adjustment of the display can be made automatically without the need for operator intervention. That is, the driver can use all the attention in traffic situations, while the display device is automatically adjusted to the ambient luminance. This is particularly preferable in the case where a rapid change in the surroundings appears, for example, in the running of a tunnel.

The control unit may be configured to perform a transition between a single-view mode and a dual-view mode based on data on ambient light provided thereto in this manner. For example, if the display in the dual-view mode is associated with a relatively low image quality, it is possible to automatically switch the display into a single-view mode. This is particularly advantageous when an image display for the driver, for example an indication of a navigation system, a display of an obstacle or any other display supporting the driver, is of greater importance for safe driving, should it be given higher priority.

It is also possible that the operator, for example the driver himself, inputs a command or an additional output device for e.g. such data is provided. For this purpose, a communication interface may be provided for inputting and / or outputting data between the user and the control unit. Such a communication interface may typically be formed as a CAN-interface. It is also possible to transmit an instruction to the control unit via the communication interface via the acoustic command. Manual input is also possible.

In particular, in the improvement of the present invention, the control unit can be configured to control the display device or the correction device based on data input through the communication interface. For example, switching from a dual-view mode to a single-view mode or vice versa can be accomplished by a command entered by a user, e.g., a driver, via a communication interface. This allows for particularly high flexibility because different displays are required on the display depending on the driving situation, for example depending on the ambient brightness and whether the passenger is present in addition to the driver when driving.

Switching between dual-view mode and single-view mode or switching between active and non-active correction can be done step by step. In an improvement of the present invention, the control unit is formed, for example, to change an active correction device into a step-deactivated state or vice versa. That is, the correction that is performed until the correction is no longer executed is reduced (fade-out). It is also possible to reverse the process of turning the deactivated state into an activated state (fade-in).

The present invention provides a display device for a vehicle that enables high flexibility and improved image display.

BRIEF DESCRIPTION OF THE DRAWINGS Embodiments of the invention are shown in the drawings and will be described in detail below with reference to the other advantages.
1 is a schematic view of a display device according to the present invention;

Fig. 1 shows a schematic view of a display device 1 for a passenger car. The display device 1 includes an image receiving unit 2, and corresponding image data of the image (s) to be displayed is input into the image receiving unit. Further, a microcontroller 3 is provided as a control unit. Which is connected to the communication interface 4. [ In addition, there is an optical sensor 5, and the measurement data of the optical sensor can be transmitted to the microcontroller 3. There is also a correction device 6, which on the one hand can be controlled or adjusted by a microcontroller and on the other hand receives corresponding image data from the image receiving unit 2. [ The correction device 6 may be implemented with a field programmable gate array (FPGA). The image data processed in the correction device 6 is transmitted to the timing controller 7. [ The timing controller 7 and the lighting device 8 form the inputs of the display 9. [ The image data flow into the display 9 through the image receiving unit 2, the correction device 6 and the timing controller 7 is indicated by an arrow 10. The connection line 11 represents a connection between the communication interface 4 and the control unit 3. [ Line 12 is the measurement data line from the light sensor 5 into the control unit. The adjustment of the microcontroller 3 of the correction device 6 takes place via line 13. [ The lighting device 8 is connected to the display 9 via a line 14.

Basically, the raw image data is received from the image receiving unit 2 via the line 13. [ Depending on what ambient luminance is given, the microcontroller 3 determines what type of display, i. E., A single-view mode or a dual-view mode should be made. Thus, the image data arriving through the line 10 into the display device 1 are, for example, data of the navigation system and data of the video film to be reproduced simultaneously for the passenger. Since the communication interface is also provided, the driver can also provide what display mode should be given through the command to the microcontroller 3. Typically, the image receiving unit is a receiver for digital video signals of LVDS standard (low voltage differential signaling). The image data may be transmitted between individual functional blocks, for example as a digital RGB signal, along with a clock and synchronization signal (HSYNC, VSYNC; ENABLE). The video signals are transmitted, for example, as an RGB signal plus a SYNC signal plus a clock. In LVDS, LDI or RSDS standards, different transmissions are possible.

It is also possible that different transfers are made between the image receiving unit 2, the correction device 6 and the timing controller 7. [ The correction device 6 is formed such that the black level is increased in the first step and crosstalk correction is performed in the second step. The timing controller 7 may comprise a field programmable gate array (FPGA) or an ASIC as a logic circuit network. FPGA modules generally have the advantage of being newly programmable. FPGAs and ASICs feature rapid processing of data. In another variant, the timing controller 7 is integrated in a row or column driver on the display.

In addition, the correction device 6 may be configured to perform digital contrast adjustment or gamma correction. This correction can be used basically in the single-view mode and the dual-view mode.

In another embodiment, the image receiving unit can be connected to an image mixing unit, and the image mixing unit enables automatic detection of a dual-view image from two different image data inputs. Also, basically, if both the driver and passenger are to view the same image, then there are two different image data inputs, as in the dual-view mode, but these inputs are identical during the display of the same image. By comparison of the image data, the control unit can, on its own, detect that the two images to be displayed are the same and perform corresponding block level increases or corresponding image corrections tailored to the particular situation.

Common features of all embodiments are that the display device is configured to provide a display in a single-view mode and a dual-view mode.

1 display device
3 Control unit
4 communication interface
5 light sensors
6 correction device

Claims (13)

A vehicle display device (1) for displaying images such as vehicle settings, information, and video,
The display device 1 is configured to provide a dual / split-view mode display that simultaneously displays at least two images that are individually visible from different viewing directions as well as a single-view mode displaying exactly one image And the display device. The display device according to claim 1, wherein a control unit (3) for controlling the display device (1) is provided. 3. A display device according to claim 1 or 2, characterized in that the control unit (3) is configured to switch the display of the display device (1) from a single-view mode to a dual / Device. A display device according to any one of claims 1 to 3, characterized in that a correction device (6) is provided for setting and / or correcting crosstalk. The display device according to any one of claims 1 to 4, wherein the correction device (6) is formed to increase the black level. 6. A display device according to any one of claims 1 to 5, wherein said control unit (3) is configured to perform control of said correction device (6). 7. The display device according to any one of claims 1 to 6, wherein the control unit (3) is configured to activate and / or deactivate the correction device (6). 8. A display device according to any one of claims 1 to 7, characterized in that an optical sensor (5) is provided for detecting the ambient luminance. 9. A display device according to any one of claims 1 to 8, wherein the control unit (3) controls the display device (1) and / or the correction device (6) And is configured to perform on the basis of the luminance. 10. A communication interface (4) according to any one of claims 1 to 9, characterized in that a communication interface (4) is provided for inputting and / or outputting data such as an instruction, technical information or the like between the user and the control unit / RTI > 11. A device according to any one of the preceding claims, characterized in that the control unit (3) controls the control of the display device (1) and / or the correction device (6) The display device comprising: 12. A control device according to any one of claims 1 to 11, characterized in that the control unit (3) is configured to perform a stepwise switching from an activated state to an inactive state of the correction device (8) / RTI > 1. A method for displaying images such as vehicle setting, information, and video on an automotive display device (1)
The display device 1 not only provides a display of a single-view mode displaying exactly one image, but also the display device 1 displays a dual display which simultaneously displays at least two images, / ≪ / RTI > split view mode.

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