Display device for vehicle

Abstract

This disclosure relates to a display device for vehicles. One embodiment of the vehicle display device includes: an illuminance sensor for detecting illuminance information outside the vehicle; an image output device for outputting an image; and a signal processing device for outputting an output image signal to the image output device based on an input image signal. The signal processing device extracts luminance data and saturation data from the input image signal, calculates compensation values ​​for the luminance data and saturation data based on the illuminance information outside the vehicle, and outputs an output image signal based on the calculated compensation values ​​for the luminance data and saturation data. This prevents visibility degradation caused by external illuminance.

Description

Technical Field

[0001] This disclosure relates to a display device for vehicles, and more specifically, to a display device for vehicles capable of preventing a decrease in visibility caused by external illuminance. Background Technology

[0002] A vehicle is a device that moves in the direction desired by the user. For example, a car can be cited as a representative example.

[0003] On the other hand, for the convenience of vehicle users, a vehicle display device is installed inside the vehicle.

[0004] For example, various information is displayed by setting up displays in the dashboard, etc. On the other hand, in order to display vehicle driving information, various displays such as CID (Center Information Display) and head-up displays that output images to the windshield are gradually being installed in vehicles, in addition to the dashboard.

[0005] On the other hand, there is a problem that external light from outside the vehicle reduces the visibility of images displayed on head-up displays and other similar devices. Summary of the Invention

[0006] The problem to be solved

[0007] The problem solved by this disclosure is to provide a display device for vehicles that can prevent visibility loss caused by external illuminance.

[0008] On the other hand, another problem solved by this disclosure is to provide a vehicle display device that can reduce the decrease in brightness and saturation recognition caused by external illuminance.

[0009] Technical solutions to the problem

[0010] A vehicle display device according to an embodiment of the present disclosure for addressing the above-mentioned problems includes: an illuminance sensor for detecting illuminance information outside the vehicle; an image output device for outputting an image; and a signal processing device for outputting an output image signal to the image output device based on an input image signal. The signal processing device extracts luminance data and saturation data from the input image signal, calculates compensation values ​​for the luminance data and saturation data based on the illuminance information outside the vehicle, and outputs an output image signal based on the calculated compensation values ​​for the luminance data and saturation data.

[0011] On the other hand, the signal processing device can calculate the luminance compensation value based on the average value of the luminance data of the input image signal; the signal processing device can calculate the saturation compensation value based on the standard deviation of the saturation data of the input image signal.

[0012] On the other hand, the signal processing device can control the luminance data and saturation data to be greater as the level of external illuminance information of the vehicle increases.

[0013] On the other hand, if the first luminance level of the input image signal is lower than the reference luminance level when calculating the compensation value of the luminance data based on the illuminance information outside the vehicle, the signal processing device can increase the first luminance level by a first luminance increase amount; if the second luminance level of the input image signal is higher than the reference luminance level when calculating the compensation value of the luminance data based on the illuminance information outside the vehicle, the signal processing device can increase the second luminance level by a second increase amount that is smaller than the first luminance increase amount.

[0014] On the other hand, if the first saturation level of the input image signal is lower than the reference saturation level when calculating the compensation value of saturation data based on the illumination information outside the vehicle, the signal processing device can increase the first saturation level by a first saturation increase amount; if the second saturation level of the input image signal is higher than the reference saturation level when calculating the compensation value of saturation data based on the illumination information outside the vehicle, the signal processing device can increase the second saturation level by a second saturation increase amount that is smaller than the first saturation increase amount.

[0015] On the other hand, the signal processing device can be controlled to output a first image containing text in normal mode, and a second image containing objects or images in compensation mode based on illumination information outside the vehicle.

[0016] On the other hand, the signal processing device can be controlled to output a second image, which includes an object or image in addition to the text, after outputting a first image containing text when switching from normal mode to compensation mode.

[0017] On the other hand, the image output device may include an image generation device that outputs the projected image in the direction of the windshield.

[0018] On the other hand, the image output device may include a display with an organic light-emitting panel.

[0019] On the other hand, the image output device may include a display with a transparent organic light-emitting panel; the transparency of the transparent organic light-emitting panel may be lower than the transparency of the windshield.

[0020] Another embodiment of the vehicle display device disclosed herein includes: an illuminance sensor for detecting illuminance information outside the vehicle; an image output device for outputting an image; and a signal processing device for outputting an output image signal to the image output device based on an input image signal; the signal processing device is controlled to output a first image in a normal mode and to output a second image with increased brightness and saturation levels compared to the first image in a compensation mode based on illuminance information outside the vehicle.

[0021] On the other hand, the signal processing device can be controlled to output a first image containing text in normal mode, and a second image containing objects or images in compensation mode based on illumination information outside the vehicle.

[0022] On the other hand, the signal processing device can be controlled to output a second image, which includes an object or image in addition to the text, after outputting a first image containing text when switching from normal mode to compensation mode.

[0023] On the other hand, the image output device may include an image generation device that outputs the projected image in the direction of the windshield.

[0024] On the other hand, the image output device may include a display with an organic light-emitting panel.

[0025] Invention Effects

[0026] A vehicle display device according to an embodiment of this disclosure includes: an illuminance sensor for detecting illuminance information outside the vehicle; an image output device for outputting an image; and a signal processing device for outputting an output image signal to the image output device based on an input image signal. The signal processing device extracts luminance data and saturation data from the input image signal, calculates compensation values ​​for the luminance data and saturation data based on the illuminance information outside the vehicle, and outputs an output image signal based on the calculated compensation values ​​for the luminance data and saturation data. This prevents a decrease in visibility caused by external illuminance. In particular, it reduces the decrease in luminance and saturation recognition caused by external illuminance.

[0027] On the other hand, the signal processing device can calculate the luminance compensation value based on the average value of the luminance data of the input image signal; the signal processing device can calculate the saturation compensation value based on the standard deviation of the saturation data of the input image signal. This prevents visibility loss caused by external illumination.

[0028] On the other hand, the signal processing device can be controlled such that the higher the level of external illuminance information, the greater the compensation values ​​for luminance and saturation data. This prevents visibility degradation caused by external illuminance.

[0029] On the other hand, if the first luminance level of the input image signal is lower than the reference luminance level when calculating the compensation value of the luminance data based on the illuminance information outside the vehicle, the signal processing device can increase the first luminance level by a first luminance increase amount; if the second luminance level of the input image signal is higher than the reference luminance level when calculating the compensation value of the luminance data based on the illuminance information outside the vehicle, the signal processing device can increase the second luminance level by a second increase amount smaller than the first luminance increase amount. This prevents a decrease in visibility caused by external illuminance.

[0030] On the other hand, if the first saturation level of the input image signal is lower than the reference saturation level when calculating the compensation value of saturation data based on external illumination information of the vehicle, the signal processing device can increase the first saturation level by a first saturation increase amount; if the second saturation level of the input image signal is higher than the reference saturation level when calculating the compensation value of saturation data based on external illumination information of the vehicle, the signal processing device can increase the second saturation level by a second saturation increase amount smaller than the first saturation increase amount. This prevents visibility degradation caused by external illumination.

[0031] On the other hand, the signal processing device can be controlled to output a first image containing text in normal mode, and a second image containing objects or images in compensation mode based on external illumination information of the vehicle. This prevents visibility degradation caused by external illumination.

[0032] On the other hand, the signal processing device can be controlled to output a second image, which includes an object or image in addition to the text, after outputting a first image containing text when switching from normal mode to compensation mode. This prevents a decrease in visibility caused by external illumination.

[0033] On the other hand, the image output device may include an image generating device that outputs the projected image in the direction of the windshield. This prevents a decrease in visibility caused by external illumination.

[0034] On the other hand, the image output device may include a display with an organic light-emitting panel. This prevents a decrease in visibility caused by external illuminance.

[0035] On the other hand, the image output device may include a display with a transparent organic light-emitting panel; the transparency of the transparent organic light-emitting panel may be lower than that of the windshield. This prevents a decrease in visibility caused by external illuminance.

[0036] Another embodiment of the vehicle display device disclosed herein includes: an illuminance sensor for detecting illuminance information outside the vehicle; an image output device for outputting an image; and a signal processing device for outputting an output image signal to the image output device based on an input image signal. The signal processing device is controlled to output a first image in a normal mode and to output a second image with increased brightness and saturation levels compared to the first image in a compensation mode based on illuminance information outside the vehicle. This prevents a decrease in visibility caused by external illuminance. In particular, it reduces the decrease in brightness and saturation recognition caused by external illuminance.

[0037] On the other hand, the signal processing device can be controlled to output a first image containing text in normal mode, and a second image containing objects or images in compensation mode based on external illumination information of the vehicle. This prevents visibility degradation caused by external illumination.

[0038] On the other hand, the signal processing device can be controlled to output a second image, which includes an object or image in addition to the text, after outputting a first image containing text when switching from normal mode to compensation mode. This prevents a decrease in visibility caused by external illumination.

[0039] On the other hand, the image output device may include an image generating device that outputs the projected image in the direction of the windshield. This prevents a decrease in visibility caused by external illumination.

[0040] On the other hand, the image output device may include a display with an organic light-emitting panel. This prevents a decrease in visibility caused by external illuminance. Attached Figure Description

[0041] Figure 1 This is a diagram showing an example of the exterior and interior of a vehicle.

[0042] Figure 2 This is a diagram showing the appearance of a vehicle display device according to an embodiment of the present disclosure.

[0043] Figure 3 Example Figure 2 An example of an internal block diagram of a vehicle display device.

[0044] Figures 4a to 4c This is an example. Figure 3 Diagrams showing the various structures of a head-up display.

[0045] Figure 4d It shows Figures 4a to 4c An example of the operation of a head-up display.

[0046] Figure 5An example of an internal block diagram of a vehicle display device according to an embodiment of the present disclosure is shown.

[0047] Figure 6 yes Figure 3 Internal block diagram of the second display.

[0048] Figures 7a to 7d This is an explanation Figure 6 The diagram is for reference when referring to organic light-emitting panels.

[0049] Figures 8a to 8c This is a diagram used to illustrate the operation of a vehicle display device related to this disclosure.

[0050] Figure 9 This is a flowchart illustrating a method of operating a display device for a vehicle according to an embodiment of the present disclosure.

[0051] Figure 10 This is an example of an internal block diagram of a signal processing apparatus according to an embodiment of the present disclosure.

[0052] Figures 11a to 12b This is an explanation Figure 9 or Figure 10 The diagram used for reference at the time.

[0053] Figure 13 This is a flowchart illustrating a method of operating a display device for a vehicle according to another embodiment of the present disclosure.

[0054] Figure 14 This is an explanation Figure 13 The diagram used for reference at the time. Detailed Implementation

[0055] The present invention will now be described in more detail with reference to the accompanying drawings.

[0056] The suffixes "module" and "section" used in the following description for the constituent elements are assigned solely for ease of writing the specification and do not have any particularly important meaning or function in themselves. Therefore, the terms "module" and "section" can be used interchangeably.

[0057] Figure 1 This is a diagram showing an example of the exterior and interior of a vehicle.

[0058] Referring to the attached diagram, the vehicle 200 is driven by a plurality of wheels 103FR, 103FL, 103RL... and a steering wheel 150. The plurality of wheels 103FR, 103FL, 103RL... are rotated by a power source, while the steering wheel 150 is used to adjust the direction of travel of the vehicle 200.

[0059] On the other hand, the vehicle 200 may also have a camera 195 for acquiring images of the front of the vehicle.

[0060] On the other hand, multiple displays 180a, 180b, and 180h for displaying images, information, etc. can be installed inside the vehicle 200.

[0061] For example, the first display 180a among the plurality of displays 180a, 180b, and 180h can be an instrument panel display, the second display 180b can be a CID (Center Information Display), and the third display 180h can be a head-up display (HUD) that projects an image onto a designated area Ara of the windshield WS.

[0062] On the other hand, the vehicle 200 described in this specification can encompass concepts such as a vehicle having an engine as a power source, a hybrid vehicle having both an engine and an electric motor as a power source, and an electric vehicle having an electric motor as a power source.

[0063] Figure 2 This is a diagram showing the appearance of a vehicle display device according to an embodiment of the present invention.

[0064] The vehicle display device 100 of this embodiment may include a signal processing device 170, which performs signal processing for displaying images, information, etc. on at least one of a plurality of displays 180a, 180b, 180h.

[0065] On the other hand, the signal processing device 170 performs signal processing based on the input image signal and outputs the processed output image signal to at least one of the plurality of displays 180a, 180b, 180h.

[0066] The first display 180a among the plurality of displays 180a, 180b, and 180h may be an instrument panel display 180a for displaying driving status, action information, etc.; the second display 180b may be a central information display 180b for displaying vehicle operating information, navigation maps, various entertainment information, or images; and the third display 180h may be a HUD display for displaying vehicle driving information.

[0067] The signal processing device 170 may internally include a memory 508 and a processor 175 to control at least one of a plurality of displays 180a, 180b, 180h.

[0068] On the other hand, the signal processing device 170 can run the first virtual machine to the third virtual machine (not shown to not shown) on the hypervisor 505 within the processor 175.

[0069] The first virtual machine (not shown) is the server virtual machine, which can control the second virtual machine (not shown) and the third virtual machine (not shown) that act as guest virtual machines.

[0070] On the other hand, the second virtual machine can be named the first guest virtual machine (Guest VirtualMaschine), and the third virtual machine can be named the second guest virtual machine.

[0071] The first guest virtual machine (not shown) can act for the first display 180a, and the second guest virtual machine (not shown) can act for the second display 180b or the third display 180h.

[0072] On the other hand, in order to transmit the same data to the first client virtual machine (not shown) and the second client virtual machine (not shown), the server virtual machine (not shown) within the processor 175 can be controlled to set the memory 508 based on the hypervisor 505. Thus, the same information or the same image can be displayed synchronously on the first display 180a and the second display 180b within the vehicle.

[0073] On the other hand, the server virtual machine (not shown) within the processor 175 can receive and process wheel speed sensor data, and transmit the processed wheel speed sensor data to at least one of the first client virtual machine (not shown) and the second client virtual machine (not shown). Thus, it is possible to share wheel speed sensor data with at least one virtual machine, etc.

[0074] Therefore, a signal processing device 170 can be used to control a plurality of displays 180a, 180b, and 180h.

[0075] On the other hand, some of the multiple displays 180a, 180b, and 180h can operate on a Linux operating system (Linux OS), while others can operate on a Web operating system (Web OS).

[0076] The signal processing apparatus 170 of this embodiment can be controlled to synchronously display the same information or the same image even on a plurality of displays 180a, 180b, 180h running under various operating systems (OS).

[0077] Figure 3 It is shown Figure 2 An example of an internal block diagram of a vehicle display device.

[0078] Referring to the accompanying drawings, the vehicle display device 100 of this disclosure includes an external illuminance sensor 711 for detecting illuminance information outside the vehicle, an image output device 180t for outputting an image, and a signal processing device 170 for outputting an image signal to the image output device 180t based on an input image signal.

[0079] On the other hand, the vehicle display device 100 of the present disclosure embodiment may also be provided with an input unit 110, a communication device 120, an interface 130, a memory 140, an internal illuminance sensor 713, an audio output unit 185, a power supply unit 190, etc.

[0080] On the other hand, the image output device 180t may include at least one display 180a, 180b, 180h.

[0081] That is, the image output device 180t may include at least one of the following displays: dashboard display 180a, CID display 180b, and head-up display 180h.

[0082] The input unit 110 may have physical buttons, pads, etc. for key input, touch input, etc.

[0083] On the other hand, the input unit 110 may have a microphone (not shown) for user voice input.

[0084] The communication device 120 can exchange data wirelessly with the mobile terminal 800 or a server (not shown).

[0085] In particular, the communication device 120 can wirelessly exchange data with the vehicle driver's mobile terminal. Various wireless data communication methods can be used, such as Bluetooth, WiFi (Wireless-Fidelity), WiFi Direct, and Apix (Automotive Pixel Chain Technology).

[0086] The communication device 120 can receive weather information and road traffic information from the mobile terminal 800 or a server (not shown), such as TPEG (Transport Protocol Expert Group) information. For this purpose, the communication device 120 may have a mobile communication module (not shown).

[0087] Interface 130 can receive sensor information from ECU (electronic control unit) 770 or sensor device 760 and transmit the received information to signal processing device 170.

[0088] Here, the sensor information may include at least one of the following: vehicle direction information, vehicle position information (GPS information), vehicle angle information, vehicle speed information, vehicle acceleration information, vehicle tilt information, vehicle forward / reverse information, battery information, fuel information, tire information, headlight information, vehicle interior temperature information, and vehicle interior humidity information.

[0089] This sensor information can be obtained from heading sensors, yaw sensors, gyroscope sensors, position modules, vehicle forward / reverse sensors, wheel sensors, vehicle speed sensors, vehicle tilt sensors, battery sensors, fuel sensors, tire sensors, steering sensors based on steering wheel rotation, interior temperature sensors, and interior humidity sensors. On the other hand, the position module may include a GPS module for receiving GPS (Global Positioning System) information.

[0090] On the other hand, interface 130 can receive frontal image data, side image data, rear image data, and distance information of obstacles around the vehicle from camera 195 or lidar (not shown), and transmit the received information to signal processing device 170.

[0091] The memory 140 can store various data for the entire operation of the vehicle display device 100, such as programs for processing or control of the signal processing device 170.

[0092] For example, memory 140 may store data about the hypervisor, server virtual machine (not shown), and multiple guest virtual machines that are to be run within processor 175.

[0093] The audio output unit 185 converts the electrical signal from the signal processing device 170 into an audio signal and outputs it. For this purpose, a speaker or the like may be included.

[0094] The power supply unit 190 can supply the power required for the operation of each component through the control of the signal processing device 170. In particular, the power supply unit 190 can receive power from the battery or the like inside the vehicle.

[0095] The HUD display 180h, serving as a second display, may include an image generation device for projecting images. Figure 1 (300), and output augmented reality-based objects through the control of the signal processing device 170.

[0096] For example, the HUD display 180h can output vehicle speed information, vehicle direction information, vehicles ahead, and distance indicators to vehicles ahead.

[0097] As another example, the HUD display 180h can output augmented reality lane mats, augmented reality route mats, or augmented reality motion mats corresponding to lane images.

[0098] The signal processing device 170 can control a plurality of displays 180a, 180b, and 180h.

[0099] The signal processing device 170 controls the overall operation of each unit within the vehicle display device 100.

[0100] For example, signal processing device 170 may include memory 508 and processor 175 that performs signal processing for vehicle displays 180a, 180b.

[0101] Processor 175 can run a hypervisor (not shown) and run server virtual machines (not shown) and multiple guest virtual machines (not shown) on the running hypervisor.

[0102] At this time, the first guest virtual machine (not shown) can operate for the first display 180a, and the second guest virtual machine (not shown) can operate for the second display 180b or the third display 180h.

[0103] On the other hand, the signal processing device 170 can process various types of signals, such as audio signals, image signals, and data signals. Therefore, the signal processing device 170 can be implemented as a system on chip (SOC).

[0104] Figures 4a to 4c This is an example. Figure 3 Diagrams showing the various structures of a head-up display.

[0105] first, Figure 4a This is an example of a head-up display illustrating an embodiment of the present disclosure.

[0106] Referring to the accompanying drawings, the head-up display 180ha of this embodiment includes a liquid crystal display panel 300x that outputs a projected image, a folding mirror 315x that reflects the projected image from the liquid crystal display panel 300x, and a concave mirror 325x that reflects the projected image from the folding mirror 315x toward the windshield WS.

[0107] The projected image reflected by Arx in the specified area of ​​the windshield WS is output to the driver's line of sight area Ara.

[0108] The concave mirror 325x within the head-up display 180ha is positioned between the liquid crystal display panel 300x and the driver's field of vision area Ara.

[0109] On the other hand, the concave mirror 325x within the head-up display 180ha determines the arrangement of the projected images and the position of the light source.

[0110] For example, if the magnification of the concave mirror 325x within the head-up display 180ha is increased and the focal distance is reduced, the size CSa of the head-up display 180ha can be reduced.

[0111] then, Figure 4b Another example of a head-up display according to an embodiment of this disclosure is shown.

[0112] Referring to the accompanying drawings, the head-up display 180hb of this embodiment includes a liquid crystal display panel 300y that outputs a projected image, a folding mirror 315y that reflects the projected image from the liquid crystal display panel 300y, a concave mirror 325y that reflects the projected image from the folding mirror 315y, and a transparent cover 335y that outputs the projected image from the concave mirror 325y to the windshield WS.

[0113] The projected image reflected by Ary in the designated area of ​​the windshield WS can be output to the driver's line of sight area Ara.

[0114] and Figure 4a In contrast, the concave mirror 325y within the head-up display 180hb is positioned at the front of the LCD panel 300y and the driver's field of vision area Ara.

[0115] That is, the liquid crystal display panel 300y in the head-up display 180hb is arranged between the concave mirror 325y and the driver's line of sight area Ara.

[0116] On the other hand, the concave mirror 325y within the head-up display 180hb determines the arrangement of the projected images and the position of the light source.

[0117] For example, if the magnification of the concave mirror 325y within the head-up display 180hb is increased and the focal distance is decreased, the size CSb of the head-up display 180hb can be reduced.

[0118] then, Figure 4c Another example of a head-up display according to an embodiment of the present disclosure is shown.

[0119] Referring to the accompanying drawings, a head-up display 180hc according to an embodiment of the present disclosure includes an image generating device 300 that outputs a projected image toward the windshield WS, and a reflector 325 that reflects the projected image from a first region Ra of the windshield WS toward the windshield WS.

[0120] The projected image from the reflector 325 is reflected in the second region Rb of the windshield WS and output to the third region Ara. At this time, the third region Ara corresponds to the driver's line of sight area.

[0121] On the other hand, the head-up display 180hc of one embodiment of the present disclosure utilizes two reflections on the windshield WS, thus ensuring a sufficient light path while reducing size.

[0122] That is, the size of the head-up display 180hc in one embodiment of this disclosure is CSa, which is smaller than Figure 4a Head-up display 180ha size CSa or Figure 4b The head-up display has a size of 180hb (CSb).

[0123] This allows for the projection of images onto a large screen while simultaneously reducing their size. In particular, it enables the reduction of size while ensuring the light path.

[0124] On the other hand, the second region Rb of the windshield WS can be closer to the third region Ara than the first region Ra of the windshield WS.

[0125] On the other hand, the angle of incidence of the projected image incident on the first region Ra of the windshield WS can be larger than the angle of incidence of the projected image incident on the second region Rb of the windshield WS. Therefore, it is possible to achieve a large-screen projected image while reducing its size.

[0126] On the other hand, the image generating device 300 can be closer to the third region Ara than the reflector 325.

[0127] On the other hand, the image generating device 300 can be positioned higher than the reflector 325. This allows for the projection of images onto a large screen while simultaneously reducing its size.

[0128] On the other hand, the image generating apparatus 300 may have a digital reflector or a liquid crystal display panel. This allows it to output projected images to the outside of the image generating apparatus 300.

[0129] For example, the image generating apparatus 300 may include a light source (not shown) and a digital reflector device (not shown) that reflects the light output from the light source.

[0130] The light source can include LEDs or laser diodes, etc.

[0131] On the other hand, a digital mirror device can have a plurality of digital mirrors. For example, a digital micromirror device.

[0132] As another example, the image generating apparatus 300 may include a light source (not shown) and a liquid crystal display panel (not shown) that outputs a projected image based on light emitted from the light source.

[0133] On the other hand, the liquid crystal display panel can output projected images with P-polarized light.

[0134] On the other hand, the first area Ra of the windshield WS can be with Figure 1 The black masking area or frit area corresponds to FZ. This improves the brightness of the projected image.

[0135] On the other hand, the head-up display 180hc of one embodiment of this disclosure may also include a transparent cover 335 disposed between the image generating apparatus 300 and the windshield WS. This allows for the protection of the interior of the image generating apparatus 300 while simultaneously projecting images to the outside of the image generating apparatus 300.

[0136] On the other hand, Figure 4a In the head-up display 180ha, the light path before the first reflection of the projected image output from the liquid crystal display panel 300x is shorter than the light path from after the first reflection to before the second reflection.

[0137] At this time, the light path of the projected image output from the liquid crystal display panel 300x before the first reflection corresponds to the liquid crystal display panel 300x and the folding mirror 315x, and the light path from the first reflection to the second reflection corresponds to the folding mirror 315x and the concave mirror 325x.

[0138] Especially in Figure 4a In the head-up display 180ha, the light path before the first reflection of the projected image output from the liquid crystal display panel 300x is much shorter than the light path from after the first reflection to before the second reflection.

[0139] On the other hand, from Figure 4c The light path of the projected image output by the image generating device 300 before the first reflection is longer than the light path from after the first reflection to before the second reflection.

[0140] Figure 4c The light path before the first reflection of the projected image output from the image generating device 300 in the head-up display 180hc corresponds to the first region Ra between the image generating device 300 and the windshield WS.

[0141] On the other hand, the light path within the head-up display 180hc from the first reflection to the second reflection corresponds to the first area Ra of the windshield WS and the reflector 325.

[0142] As shown in the figure, since the light path before the first reflection of the projected image output from the image generating device 300 is formed to be longer than the light path from after the first reflection to before the second reflection, a sufficient light path can be ensured within the small-sized CS head-up display 180hc.

[0143] Figure 4d It shows Figures 4a to 4c An example of the operation of a head-up display.

[0144] Referring to the attached diagram, Figure 4d An example is given where an instrument image 410 is displayed on a screen Scr, which serves as the first display 180a, and a HUD image 420 as a virtual image is displayed in a designated area Ara, which serves as the windshield WS.

[0145] according to Figure 4a Head-up display 180ha or Figure 4b Head-up display 180hb or Figure 4c The 180hc head-up display can be like Figure 4d As shown, the instrument image 410 is displayed on the screen Scr, while the HUD image 430 is displayed in the designated area Ara of the windshield Ws.

[0146] On the other hand, such as Figure 4d As shown, in order to display the HUD image in the area Ara and the screen Scr in the area Arb together, multiple displays 180a and 180h can also be integrated.

[0147] Figure 5 An example of an internal block diagram of a vehicle display device according to an embodiment of the present disclosure is shown.

[0148] Referring to the accompanying drawings, the vehicle display device 100 of this disclosure includes an external illuminance sensor 711 for detecting illuminance information outside the vehicle, an image output device 180t for outputting an image, and a signal processing device 170 for outputting an output image signal to the image output device 180t based on an input image signal.

[0149] On the other hand, the vehicle display device 100 of the present disclosure embodiment may also include an image generation device 300, an internal illuminance sensor 713 for detecting illuminance information inside the vehicle, and a user input unit 110.

[0150] On the other hand, the projected image output from the image generating device 300 is output to the windshield WS, and is projected or reflected by the windshield WS as a reflective medium.

[0151] On the other hand, the projected image LTb reflected on the windshield WS can be displayed as the HUD image Imb in the designated area Ara.

[0152] On the other hand, the signal processing device 170 can output a control signal for controlling the image generating device 300 based on the external illuminance Cso from the external illuminance sensor 711, the internal illuminance Csi from the internal illuminance sensor 713, or the setting input Csp from the user input unit 110.

[0153] For example, the signal processing device 170 can be controlled such that the greater the external illuminance Cso, the greater the luminance level and saturation level of the projected image LTb.

[0154] As another example, the signal processing device 170 can be controlled such that the smaller the internal illuminance Csi, the smaller the luminance level and saturation level of the projected image LTb.

[0155] As another example, the signal processing device 170 can be controlled such that the smaller the set input Csp, the smaller the brightness level and saturation level of the projected image LTb.

[0156] This prevents a decrease in the visibility of the projected image LTb reflected onto the windshield WS.

[0157] On the other hand, the signal processing device 170 can control the signal to be such that the greater the difference between the external illuminance and the internal illuminance of the vehicle 200, the greater the luminance and saturation levels of the projected image LTb. This prevents a decrease in the visibility of the projected image LTb.

[0158] On the other hand, the image generating apparatus 300 includes a light output device 400 for outputting light.

[0159] On the other hand, the light output device 400 may include a light source 309 and a digital reflector device 308 that reflects the light output from the light source 309.

[0160] For example, the light source 309 may include an LED or a laser diode.

[0161] On the other hand, the digital mirror device 308 may have a plurality of digital mirrors. For example, it may have a digital micromirror device.

[0162] On the other hand, the image generating apparatus 300 may also include a digital mirror control unit 305 for controlling the digital mirror device 308 and a light source control unit 306 for controlling the light source 309.

[0163] In particular, the image generating apparatus 300 may have a processor 370, which may include a digital mirror control unit 305 for controlling the digital mirror apparatus 308 and a light source control unit 306 for controlling the light source 309.

[0164] On the other hand, the signal processing device 170 may have an image generation control unit 173 for controlling the image generation device 300.

[0165] On the other hand, the image generation control unit 173 may be provided in the processor 175 within the signal processing device 170.

[0166] Figure 6 yes Figure 3 Internal block diagram of the second display.

[0167] Referring to the accompanying drawings, the second display 180b based on an organic light-emitting panel may include an organic light-emitting panel 210, a first interface section 230, a second interface section 231, a timing controller 232, a gate driving section 234, a data driving section 236, a memory 240, a power supply section 290, a current detection section 510, etc.

[0168] On the other hand, the display 180b can receive the image signal Vd, the first DC power supply V1 and the second DC power supply V2, and display a specified image based on the image signal Vd.

[0169] On the other hand, the first interface section 230 within the second display 180b can receive the image signal Vd and the first DC power supply V1 from the signal processing device 170.

[0170] Here, the first DC power supply V1 can be used for the operation of the power supply unit 290 and the timing controller 232 within the second display 180b.

[0171] Next, the second interface unit 231 can receive a second DC power supply V2 from the external power supply unit 190. On the other hand, the second DC power supply V2 can be input to the data drive unit 236 inside the second display 180b.

[0172] The timing controller 232 can output a data drive signal Sda and a gate drive signal Sga based on the image signal Vd.

[0173] For example, when the first interface unit 230 converts the input image signal Vd and outputs the converted image signal va1, the timing controller 232 can output the data drive signal Sda and the gate drive signal Sga based on the converted image signal va1.

[0174] In addition to the video signal Vd from the signal processing unit 170, the timing controller 232 can also receive control signals, vertical synchronization signals Vsync, etc.

[0175] Furthermore, in addition to the video signal Vd, the timing controller 232 can also output a gate drive signal Sga for the operation of the gate drive unit 234 and a data drive signal Sda for the operation of the data drive unit 236 based on control signals, vertical synchronization signals Vsync, etc.

[0176] At this time, the data drive signal Sda can be the data drive signal for driving RGB sub-pixels when the panel 210 has RGB sub-pixels.

[0177] On the other hand, the data driving signal Sda can be an RGBW sub-pixel driving data driving signal when the panel 210 has RGBW sub-pixels.

[0178] On the other hand, the timing controller 232 can also output a control signal Cs to the gate drive unit 234.

[0179] The gate driving unit 234 and the data driving unit 236 supply scan signals and data signals to the organic light-emitting panel 210 through the gate line (GL) and data line (DL) respectively, based on the gate driving signal Sga and the data driving signal Sda from the timing controller 232. As a result, the organic light-emitting panel 210 displays a specified image.

[0180] On the other hand, the organic light-emitting panel 210 may include an organic light-emitting layer. In order to display an image, a plurality of gate lines (GL) and data lines (DL) may be arranged in a matrix pattern for each pixel corresponding to the organic light-emitting layer.

[0181] On the other hand, since the gate line (GL) is input with a scan signal, it can also be named a scan line.

[0182] On the other hand, the data driving unit 236 can output data signals to the organic light-emitting panel 210 based on the second DC power supply V2 from the second interface unit 231.

[0183] The power supply unit 290 can supply various power sources to the gate drive unit 234, the data drive unit 236, the timing controller 232, etc.

[0184] The current detection unit 510 can detect the current flowing in the sub-pixels of the panel 210. The detected current can be input to the processor 270, etc., for current accumulation calculation.

[0185] On the other hand, the timing controller 232, gate drive unit 234, data drive unit 236, and memory 240 in the attached figure can be implemented by a single integrated circuit (IC).

[0186] Therefore, the timing controller 232, the gate drive unit 234, the data drive unit 236, and the memory 240 can be named the drive control unit 285.

[0187] On the other hand, the drive control unit 285 may include a buffer (not shown) for storing frame data.

[0188] In particular, the timing controller 232 within the drive control unit 285 can output gate drive signals and data drive signals based on frame data stored in a buffer (not shown) or memory 240.

[0189] The timing controller 232 or the drive control unit 285 can perform various controls within the second display 180b. For example, it can control the gate drive unit 234, the data drive unit 236, the timing controller 232, etc.

[0190] On the other hand, the timing controller 232 or the drive control unit 285 can receive current information flowing in the sub-pixels of the panel 210 from the current detection unit 510.

[0191] Furthermore, the timing controller 232 or the drive control unit 285 can calculate the cumulative current of each sub-pixel of the panel 210 based on the current information flowing in the sub-pixels of the panel 210. The calculated cumulative current can be stored in the memory 240.

[0192] On the other hand, if the cumulative current of the sub-pixels of each panel 210 is above the allowable value, the timing controller 232 or the drive control unit 285 can determine that it is a burn-in.

[0193] For example, if the cumulative current of the sub-pixels of each panel 210 is more than 300,000A, the timing controller 232 or the drive control unit 285 can determine that it is a sub-pixel of image retention.

[0194] On the other hand, if the accumulated current of some sub-pixels in each panel 210 is close to the allowable value, the timing controller 232 or the drive control unit 285 can determine that the sub-pixel is the sub-pixel of the expected image retention.

[0195] On the other hand, the timing controller 232 or the drive control unit 285 can determine the sub-pixel with the largest accumulated current as the expected residual shadow pixel based on the current detected by the current detection unit 510.

[0196] On the other hand, the timing controller 232 or the drive control unit 285 may predict the current information flowing in the sub-pixel based on the image signal from the signal processing device 170, independent of the operation of the current detection unit 510, and determine the sub-pixel of the expected afterimage based on the predicted current information.

[0197] Figures 7a to 7d This is an explanation Figure 6 The diagram is for reference when referring to organic light-emitting panels.

[0198] first, Figure 7a This is a diagram showing an example of pixels within an organic light-emitting panel 210.

[0199] Referring to the attached diagram, the organic light-emitting panel 210 may be provided with a plurality of scan lines Scan 1 to Scan n and a plurality of data lines R1, G1, B1 to Rm, Gm, Bm intersecting with them.

[0200] On the other hand, pixels are defined in the intersection area of ​​scan lines and data lines within the organic light-emitting panel 210. The accompanying drawings show pixels with RGB sub-pixels SR1, SG1, and SB1.

[0201] On the other hand, red organic light-emitting diodes, green organic light-emitting diodes, and blue organic light-emitting diodes are respectively arranged in the RGB sub-pixels SR1, SG1, and SB1.

[0202] then, Figure 7b This is another example of a pixel within panel 210.

[0203] Referring to the attached diagram, panel 210 may be provided with a plurality of scan lines Scan 1 to Scan n and a plurality of data lines R1, G1, B1, W1 to Rm, Gm, Bm, Wm intersecting with them.

[0204] On the other hand, pixels are defined in the intersection area of ​​scan lines and data lines within panel 210. The accompanying drawings show pixels with RGBW subpixels SR1, SG1, SB1, and SW1.

[0205] On the other hand, red organic light-emitting diodes, green organic light-emitting diodes, blue organic light-emitting diodes, and white organic light-emitting diodes are respectively arranged in the sub-pixels SR1, SG1, SB1, and SW1 of RGBW.

[0206] Figure 7c It shows Figure 7a or Figure 7b An example of a circuit within a sub-pixel of a panel's pixel.

[0207] Referring to the attached diagram, the sub-pixel circuit CRTm is an active type and may include a scan switch element SW1, a storage capacitor Cst, a drive switch element SW2, and an organic light-emitting layer OLED.

[0208] A scan line is connected to the gate terminal of the scan switch element SW1. The scan switch element SW1 is turned on according to the input scan signal Vdscan. When turned on, the input data signal Vdata is transmitted to the gate terminal of the drive switch element SW2 or one end of the storage capacitor Cst.

[0209] A storage capacitor Cst is formed between the gate terminal and the source terminal of the driving switching element SW2, and stores the specified difference between the data signal level transmitted to one end of the storage capacitor Cst and the DC voltage VDD level transmitted to the other end of the storage capacitor Cst.

[0210] For example, when data signals have different levels depending on the PAM (Pulse Amplitude Modulation) method, the power supply level stored in the storage capacitor Cst changes according to the level difference of the data signal Vdata.

[0211] As another example, when the data signals have different pulse widths depending on the PWM (Pulse Width Modulation) method, the power supply level stored in the storage capacitor Cst changes according to the difference in the pulse width of the data signal Vdata.

[0212] The driving switch element SW2 is turned on according to the power supply level stored in the storage capacitor Cst. When the driving switch element SW2 is turned on, a driving current IOLED proportional to the stored power supply level flows in the organic light-emitting layer OLED. As a result, the organic light-emitting layer OLED performs the light-emitting action.

[0213] An organic light-emitting layer (OLED) may include an emissive layer (EML) corresponding to a sub-pixel, and may include at least one of a hole injection layer (HIL), a hole transport layer (HTL), an electron transport layer (ETL), and an electron injection layer (EIL). In addition, it may also include a hole blocking layer, etc.

[0214] On the other hand, the attached figure shows a p-type MOSFET as the scanning switch element SW1 and the drive switch element SW2, but it can also be an n-type MOSFET, or other switching elements such as JFET, IGBT or SiC can be used.

[0215] On the other hand, a pixel is a retaining element that continues to emit light from the organic light-emitting layer of an OLED after a scan signal has been applied during a unit display time period, specifically a unit frame period.

[0216] On the other hand, the sub-pixel circuit CRTm in the attached diagram is driven in an active matrix manner.

[0217] Figure 7d It shows Figure 7a or Figure 7b Another example of circuitry within sub-pixels of a panel's pixels.

[0218] Referring to the attached diagram, the organic light-emitting sub-pixel (CRTm) circuit is a passive type, which can have only organic light-emitting diodes (LEDs) without additional switching elements.

[0219] As shown in the figure, the anode of the organic light-emitting diode (LED) can be connected to the data line and input with the data signal Vdata, and the cathode of the LED can be connected to the scan line and input with the scan signal Vscan.

[0220] On the other hand, organic light-emitting diodes can emit light organically or non-organically depending on the number of subframes based on a passive matrix approach.

[0221] On the other hand, unlike the attached figure, the anode of the organic light-emitting diode (LED) can be connected to the scan line and input with the scan signal Vscan, while the cathode of the LED can be connected to the data line and input with the data signal Vdata.

[0222] On the other hand, the sub-pixel circuit CRTm in the attached diagram is driven in a passive matrix manner.

[0223] Figures 8a to 8c This is a diagram used to illustrate the operation of a vehicle display device related to this disclosure.

[0224] Figure 8a An example of a display image based on an input image and external illumination is shown.

[0225] Referring to the attached diagram, Figure 8a The input image 810 of (a) may have a low gray level region ARa with a luminance level lower than the reference level and a saturation region Arb with a saturation center.

[0226] On the other hand, such as Figure 8a As shown in (b), the higher the level of external illuminance, the lower the luminance level of the low grayscale region Ara in the displayed image 815, making it difficult to distinguish low grayscale levels, and the lower the saturation level in the saturation region Arba, making it difficult to distinguish saturation.

[0227] Figure 8bAn example of a color space that changes according to external illuminance is given.

[0228] Referring to the attached diagram, Figure 8b (a) provides an example of a CIE-based color space.

[0229] As the level of external illuminance increases, the color space shrinks from the maximum range of RGa to the minimum range of RGb. Therefore, the higher the level of external illuminance, the lower the color expressiveness.

[0230] Referring to the attached diagram, Figure 8b (b) provides an example of a CIELAB-based color space.

[0231] As the level of external illuminance increases, the color space shrinks from its maximum range of RGm towards its minimum range of RGn. Therefore, the higher the level of external illuminance, the lower the color performance.

[0232] Figure 8c Examples are given of luminance levels that vary depending on external illuminance.

[0233] Referring to the attached diagram, Figure 8c (a) shows various examples of the conversion curves of output luminance relative to input luminance that change according to changes in external illuminance.

[0234] As the level of external illuminance increases, the luminance conversion curve shifts from the GRa curve, which has the largest luminance range, towards the GRf curve, which has the smallest luminance range. This can be identified as a luminance level conversion being performed. Therefore, the higher the level of external illuminance, the lower the luminance performance.

[0235] Referring to the attached diagram, Figure 8c (b) shows various examples of CIELAB-based luminance conversion curves that change according to changes in external illuminance.

[0236] As the level of external illuminance increases, the luminance conversion curve shifts from the GR1 curve, which has the largest luminance range, to the GR6 curve, which has the smallest luminance range. This can be identified as a luminance level conversion being performed. Therefore, the higher the level of external illuminance, the lower the luminance performance.

[0237] Therefore, this disclosure proposes a technical solution that can prevent the decrease in visibility caused by external illuminance. In particular, it proposes a technical solution that can reduce the decrease in luminance and saturation recognition caused by external illuminance.

[0238] Figure 9 This is a flowchart illustrating a method of operating a display device for a vehicle according to an embodiment of the present disclosure.

[0239] Referring to the accompanying drawings, in a vehicle display device 100 according to an embodiment of the present disclosure, the signal processing device 170 receives an input image signal (S910).

[0240] The input image signal at this time can be an image signal received from server 900, an image signal received from mobile terminal 800, a camera image signal received from camera 195, or an image signal stored in memory 140, etc.

[0241] Next, the signal processing apparatus 170 of an embodiment of the present disclosure extracts luminance data and saturation data from the input image signal (S920).

[0242] For example, the signal processing device 170 can convert the input image signal to YCbCr format when the input image signal is in RGB format, and extract luminance data by extracting the Y component from the YCbCr format image signal, and extract saturation data by extracting the Cb and Cr components.

[0243] Next, the signal processing device 170 calculates the compensation values ​​for luminance data and saturation data based on the illuminance information outside the vehicle (S930).

[0244] For example, the signal processing device 170 can receive external illuminance information from the external illuminance sensor 711 that detects external illuminance information.

[0245] Next, the signal processing device 170 outputs an output image signal based on the compensation values ​​of the calculated luminance data and saturation data (S940).

[0246] This prevents the decrease in visibility caused by external illuminance. In particular, it reduces the decrease in luminance and saturation recognition caused by external illuminance.

[0247] On the other hand, in step S930, the signal processing device 170 can calculate the luminance compensation value based on the average value of the luminance data of the input image signal, and can calculate the saturation compensation value based on the standard deviation of the saturation data of the input image signal. This prevents a decrease in visibility caused by external illumination.

[0248] The average value of the brightness data of the input image signal at this time is the average value of the brightness data of each frame, which can be the average brightness level (APL).

[0249] On the other hand, the signal processing device 170 can be controlled such that the higher the level of external illuminance information, the greater the compensation values ​​for luminance and saturation data. Therefore, even if the level of external illuminance information increases, visibility degradation can be prevented.

[0250] Figure 10 This is an example of an internal block diagram of a signal processing apparatus 170 according to an embodiment of the present disclosure.

[0251] Referring to the accompanying drawings, a signal processing apparatus 170 according to an embodiment of the present disclosure may include a data conversion unit 1010, a luminance data extraction unit 1015, a saturation data extraction unit 1018, a luminance compensation unit 1025, a saturation compensation unit 1028, a data synthesis unit 1030, and a data conversion unit 1040.

[0252] First, the data conversion unit 1010 within the signal processing device 170 can convert the input image signal, which is in RGB format, to YCbCr format.

[0253] On the other hand, the data conversion unit 1010 in the signal processing device 170 can directly pass the input image signal without performing data conversion when the input image signal is in YCbCr format.

[0254] Next, the luminance data extraction unit 1015 in the signal processing device 170 can extract luminance data by extracting the Y component from the YCbCr format image signal from the data conversion unit 1010.

[0255] On the other hand, the saturation data extraction unit 1018 in the signal processing device 170 can extract saturation data by extracting Cb and Cr components from the YCbCr format image signal from the data conversion unit 1010.

[0256] Next, the luminance compensation unit 1025 in the signal processing device 170 can calculate the compensation value of the extracted luminance data based on the external illuminance level DTc.

[0257] For example, the luminance compensation unit 1025 in the signal processing device 170 can calculate the luminance compensation value based on the average value of the luminance data of the input image signal.

[0258] On the other hand, the luminance compensation unit 1025 in the signal processing device 170 can calculate the compensation value of the luminance data based on the level DTc of the external illuminance that the display can show relative to the maximum luminance.

[0259] For example, the luminance compensation unit 1025 in the signal processing device 170 can be controlled such that the higher the maximum luminance level that the display can show, the smaller the compensation value of the luminance data.

[0260] On the other hand, the luminance compensation unit 1025 in the signal processing device 170 can be controlled such that the higher the level of the illuminance information outside the vehicle, the greater the compensation value of the luminance data.

[0261] Furthermore, the luminance compensation unit 1025 within the signal processing device 170 can output compensated luminance data, which is the sum of the compensation value of the luminance data and the luminance data.

[0262] Next, the saturation compensation unit 1028 in the signal processing device 170 can calculate the compensation value of the extracted saturation data based on the external illuminance level DTc.

[0263] For example, the saturation compensation unit 1028 in the signal processing device 170 can calculate the compensation value of the saturation data based on the standard deviation of the saturation data of the input image signal.

[0264] On the other hand, the saturation compensation unit 1028 in the signal processing device 170 can calculate the compensation value of the luminance data based on the level DTc of the external illuminance that the display can show relative to the maximum luminance.

[0265] For example, the saturation compensation unit 1028 of the signal processing device 170 can be controlled such that the higher the maximum brightness level that the display can show, the smaller the compensation value of the saturation data.

[0266] On the other hand, the saturation compensation unit 1028 in the signal processing device 170 can be controlled such that the higher the level of the illumination information outside the vehicle, the greater the compensation value of the saturation data.

[0267] Furthermore, the saturation compensation unit 1028 within the signal processing device 170 can output compensated saturation data, which is the sum of the compensation value and the saturation data.

[0268] On the other hand, the data synthesis unit 1030 within the signal processing device 170 can synthesize luminance compensation data and saturation compensation data.

[0269] Next, the data conversion unit 1040 within the signal processing device 170 can output an image signal by converting the YCbCr-based image signal from the data synthesis unit 1030 into an RGB-based image signal.

[0270] This prevents the decrease in visibility caused by external illuminance. In particular, it reduces the decrease in luminance and saturation recognition caused by external illuminance.

[0271] Figures 11a to 12b This is an explanation Figure 9 or Figure 10 The diagram used for reference at the time.

[0272] Figure 11a An example of luminance compensation based on external illuminance is shown.

[0273] Referring to the accompanying drawings, the signal processing device 170 can perform luminance conversion on the luminance level of the input image signal based on GRr, which serves as a reference conversion curve, and output an output image signal with the converted luminance level.

[0274] On the other hand, such as Figure 8c As shown in (b), as the level of external illuminance increases, the luminance transition perceived by users such as drivers shifts from the GR1 curve towards the GR6 curve, which can be identified as a luminance level transition being performed. Therefore, the higher the level of external illuminance, the lower the luminance performance.

[0275] Figure 11a Example (a) provides Figure 8c In (b), the GR6 curve, which has the highest level of external illuminance, and the GR3 curve, which has a lower level of external illuminance than GR6, are among the GR1 to GR6 curves.

[0276] then, Figure 11a Example (b) with Figure 11a The luminance compensation curves corresponding to the GR3 and GR6 curves in (a).

[0277] The signal processing apparatus 170 of this embodiment can be controlled such that the higher the level of external illuminance, the greater the compensation value of the luminance data.

[0278] For example, the signal processing device 170 can be controlled such that the level of external illuminance corresponds to the largest GR6 curve, thereby performing luminance conversion based on the GR6c curve with the largest compensation value of luminance data.

[0279] On the other hand, although the output luminance level relative to the input luminance may decrease compared to the GRr curve used as a reference curve, the GR6c curve has a better rate of change of output luminance relative to the input luminance, i.e., a greater instantaneous tilt.

[0280] On the other hand, the signal processing device 170 can be controlled such that the level of external illuminance corresponds to the GR3 curve, thereby performing luminance conversion based on the GR3c curve used for luminance data compensation.

[0281] At this point, compared to the baseline curve GRr, although the output luminance level relative to the input luminance may decrease, the preferred rate of change of output luminance relative to input luminance, i.e., a greater instantaneous tilt, is the GR3c curve.

[0282] On the other hand, compared with the GR6c curve, although the output luminance may be at a higher level relative to the input luminance, the preferred rate of change of output luminance relative to input luminance, i.e., a smaller instantaneous tilt, is better.

[0283] Ultimately, as Figure 11aAs shown in (c), the signal processing device 170 can be controlled to perform luminance conversion corresponding to the reference curve GRR during luminance conversion, based on the luminance compensation value based on the external illuminance level. Therefore, even if the illuminance level outside the vehicle changes, visibility degradation can be prevented.

[0284] Figure 11b An example of saturation compensation based on external illuminance is shown.

[0285] Referring to the accompanying drawings, the signal processing device 170 can perform saturation conversion on the saturation level of the input image signal based on GRrf, which serves as a reference conversion curve, and output an output image signal with the converted saturation level.

[0286] On the other hand, as the level of external illuminance increases, the saturation transition perceived by users such as drivers shifts from the GRrf curve towards the GRf1 curve, which can be identified as a saturation level transition being performed. Therefore, the higher the level of external illuminance, the lower the saturation performance.

[0287] especially, Figure 11b Examples are shown for the Gf1 curve, which represents the highest level of external illuminance, and the GRf2 curve, which represents the level of external illuminance below Gf1.

[0288] On the other hand, the signal processing apparatus 170 of this embodiment can be controlled such that the higher the level of external illuminance, the greater the compensation value of the saturation data.

[0289] For example, the signal processing device 170 can be controlled such that the level of external illuminance corresponds to the largest GRf1 curve, thereby performing saturation conversion based on the GRc1 curve with the largest compensation value of saturation data.

[0290] On the other hand, the GRc1 curve, relative to the GRrf curve which serves as the reference curve, preferably has a higher level of output saturation relative to input saturation.

[0291] On the other hand, the signal processing device 170 can be controlled to perform saturation conversion based on the GRc2 curve used for saturation data compensation, based on the correspondence between the level of external illuminance and the GRf2 curve.

[0292] At this point, compared to the baseline curve GRrf, the output saturation level of the GRc2 curve can be higher than that of the input saturation.

[0293] On the other hand, the preferred GRc2 curve has a lower level of output saturation relative to input saturation compared to the GRc1 curve.

[0294] Ultimately, as Figure 11bAs shown in (c), the signal processing device 170 can be controlled to perform a saturation transition corresponding to the reference curve GFRf during saturation transition, based on a saturation compensation value based on the external illuminance level. This prevents a decrease in visibility even if the external illuminance level of the vehicle changes.

[0295] Figure 11c An example of saturation compensation based on external illuminance is shown.

[0296] Referring to the attached diagram, the saturation region can be divided into the red and green zones on the horizontal axis, and the yellow and blue zones on the vertical axis.

[0297] On the other hand, the first saturation data IDa can include red and yellow components, and the ratio of the yellow component to the red component can be defined as θ, while the level corresponding to the size can be defined as Ra.

[0298] On the other hand, when the level of external illuminance is the first level, the first saturation data IDa can be identified as the second saturation data IDab.

[0299] At this point, the second saturation data IDb includes both red and yellow components, with the ratio of the yellow component to the red component defined as θ, and the level corresponding to the size defined as Rb, which is smaller than Ra. Therefore, external illuminance leads to a decrease in visibility.

[0300] To prevent such visibility degradation, the signal processing apparatus 170 of this embodiment can calculate a compensation value for the saturation data based on the standard deviation of the saturation data of the input image signal, since the standard deviation of the input image signal is more accurate than the average value of the saturation data as a compensation value for the saturation data.

[0301] That is, the compensation value for saturation data can be calculated based on the standard deviation of the saturation data of the input image signal. This can prevent the decrease in visibility caused by external illumination.

[0302] That is, in order to prevent the first saturation data IDa from being identified as the second saturation data IDb, the signal processing device 170 can calculate the compensation value of the saturation data corresponding to Ra-Rb, and compensate the saturation data based on this.

[0303] Therefore, even with external illuminance, it can be controlled so that the first saturation data IDa is identified as the first saturation data IDa.

[0304] On the other hand, when the level of external illuminance is lower than the first level, the first saturation data IDa can be identified as the third saturation data IC.

[0305] At this point, the third saturation data IDc can include both red and yellow components, with the ratio of the yellow component to the red component defined as θ, and the corresponding order defined as Rc, which is smaller than Ra and larger than Rb. Thus, external illuminance reduces visibility.

[0306] On the other hand, the signal processing apparatus 170 of this embodiment can be controlled to calculate a compensation value for the saturation data corresponding to Ra-Rc and compensate the saturation data based on this value in order to prevent the first saturation data IDa from being identified as the third saturation data IDc. In this case, Ra-Rc, as the saturation compensation value, is preferably less than Ra-Rb.

[0307] Therefore, even under external illuminance, it is possible to control the first saturation data IDa to be identified as the first saturation data IDa.

[0308] Figure 11d An example of a luminance compensation curve based on external illuminance compensation is provided.

[0309] Referring to the attached figure, in the brightness conversion of the input image signal, the reference curve can be performed based on GRra.

[0310] That is, the signal processing device 170 can convert the brightness level of the input image signal on the horizontal axis into the brightness level of the output image signal on the vertical axis.

[0311] On the other hand, the signal processing apparatus 170 of this embodiment can be controlled to calculate a compensation value corresponding to the first level when the external illuminance level is a first level, and perform illuminance conversion based on a first illuminance conversion curve GRLa including the compensation value. This prevents visibility degradation caused by external illuminance.

[0312] On the other hand, compared with the reference curve GRra, the output image signal has a higher brightness level according to the first brightness conversion curve GRLa.

[0313] On the other hand, the signal processing apparatus 170 of this embodiment can be controlled to calculate a compensation value corresponding to the second level when the external illuminance level is a second level lower than the first level, and perform illuminance conversion based on the second illuminance conversion curve GRLb including the compensation value. This prevents visibility degradation caused by external illuminance.

[0314] On the other hand, compared with the reference curve GRra, the output image signal has a higher brightness level according to the first brightness conversion curve GRLa.

[0315] On the other hand, compared with the first luminance conversion curve GRLa, the second luminance conversion curve GRLb is preferred to have a lower luminance level in the output image signal.

[0316] On the other hand, when calculating the compensation value of luminance data based on external illuminance information of the vehicle, if the first luminance level of the input image signal is smaller than the reference luminance level, the signal processing device 170 can increase the first luminance level by a first luminance increase amount; if the second luminance level of the input image signal is larger than the reference luminance level, the signal processing device 170 can increase the second luminance level by a second increase amount smaller than the first luminance increase amount. This prevents a decrease in visibility caused by external illuminance.

[0317] As shown in the figure, according to the first luminance conversion curve GRLa, when the first luminance level of the input image signal is 0.2 on the horizontal axis, the reference luminance level is 0.4 on the horizontal axis, and the second luminance level is 0.6 on the horizontal axis, the first luminance level of the input image signal is converted to approximately 0.45, and the second luminance level of the input image signal can be converted to approximately 0.75.

[0318] That is, according to the first luminance conversion curve GRLa, the first luminance increase of the first luminance level can be 0.45-0.2, that is, approximately 0.25, and the second luminance increase of the second luminance level can be 0.75-0.6, that is, approximately 0.15.

[0319] Ultimately, the increase in first luminance is greater than the increase in second luminance. This prevents a decrease in visibility caused by external illuminance. In particular, it prevents a decrease in visibility at low gray levels caused by external illuminance.

[0320] Figure 11e The example shows the output of the compensated image relative to the input image.

[0321] Referring to the accompanying drawings, the signal processing apparatus 170 of this embodiment receives an input image 1210 and separates the luminance data and saturation data within the input image 1210.

[0322] Next, the signal processing device 170 can calculate the compensation value of the luminance data based on the level of external illuminance, and generate an image 1215 based on the compensated luminance based on the compensation value of the luminance data.

[0323] Next, the signal processing device 170 can calculate the compensation value of the saturation data based on the level of external illumination, and generate an image 1218 based on the compensated saturation value.

[0324] Next, the signal processing device 170 can synthesize an image 1215 based on the compensated luminance and an image 1218 based on the compensated saturation, and output a compensated image 1220. Thus, an image with compensated luminance and saturation based on external illumination can be output. Ultimately, visibility degradation caused by external illumination can be prevented.

[0325] Figure 12a An example of a compensated saturation curve based on external illuminance compensation is provided.

[0326] Referring to the attached figure, in the saturation conversion of the input image signal, the reference curve can be performed based on GRrb.

[0327] That is, the signal processing device 170 can convert the saturation level of the input image signal on the horizontal axis to the saturation level of the output image signal on the vertical axis.

[0328] On the other hand, the signal processing apparatus 170 of this embodiment can be controlled to calculate a compensation value corresponding to the first level when the external illuminance level is a first level, and perform saturation conversion based on a first saturation conversion curve GRCa including the compensation value. This prevents visibility degradation caused by external illuminance.

[0329] On the other hand, compared with the reference curve GRrb, the output image signal has a higher saturation level according to the first saturation conversion curve GRCa.

[0330] Therefore, saturation compensation can be effectively performed in the high saturation region of ARcc above the baseline saturation.

[0331] On the other hand, the signal processing apparatus 170 of this embodiment can be controlled to calculate a compensation value corresponding to the second level when the external illuminance level is a second level lower than the first level, and perform saturation conversion based on the second saturation conversion curve GRCb including the compensation value. This prevents visibility degradation caused by external illuminance.

[0332] On the other hand, compared with the reference curve GRrb, the output image signal has a higher saturation level according to the first saturation conversion curve GRCa.

[0333] On the other hand, compared with the first saturation conversion curve GRCa, the second saturation conversion curve GRCb is preferred to have a lower saturation level in the output image signal.

[0334] On the other hand, when calculating the compensation value of saturation data based on external illumination information of the vehicle, if the first saturation level of the input image signal is smaller than the reference saturation level, the signal processing device 170 can increase the first saturation level by a first saturation increase amount; if the second saturation level of the input image signal is larger than the reference saturation level, the signal processing device 170 can increase the second saturation level by a second saturation increase amount smaller than the first saturation increase amount. This prevents a decrease in visibility caused by external illumination.

[0335] As shown in the figure, according to the first saturation conversion curve GRCa, when the first saturation level of the input image signal is 0.2 on the horizontal axis, the reference saturation level is 0.3 on the horizontal axis, and the second saturation level is 0.4 on the horizontal axis, the first saturation level of the input image signal can be converted to approximately 0.35, and the second saturation level of the input image signal can be converted to approximately 0.48.

[0336] That is, according to the first saturation conversion curve GRLa, the first saturation increase of the first saturation level can be 0.35-0.2, that is, approximately 0.15, and the second saturation increase of the second saturation level can be 0.48-0.4, that is, approximately 0.08.

[0337] Ultimately, the increase in first saturation is greater than the increase in second saturation. This prevents a decrease in visibility caused by external illuminance. In particular, it prevents a decrease in visibility due to low saturation caused by external illuminance.

[0338] Figure 12b An example of an image projected onto a windshield is shown.

[0339] Referring to the accompanying drawings, the image output device 180t of this embodiment can output a first image 1222 without compensation for external illuminance to the windshield WS.

[0340] On the other hand, the image output device 180t of this embodiment can output a second image 1225 to the windshield WS that compensates for luminance and saturation based on external illuminance.

[0341] When comparing the first image 1222 and the second image 1225, it can be seen that the brightness and saturation levels increase, thereby improving sharpness, etc. This helps prevent a decrease in visibility caused by external illumination.

[0342] Figure 13 This is a flowchart illustrating a method of operating a display device for a vehicle according to another embodiment of the present disclosure.

[0343] Referring to the accompanying drawings, in another embodiment of the present disclosure, the signal processing device 170 within the vehicle display device 100 receives an input image signal (S910).

[0344] Next, the signal processing apparatus 170 of an embodiment of the present disclosure determines whether it is a compensation mode for compensating for external illuminance (S915), and executes the compensation mode if so.

[0345] That is, according to the compensation mode, the signal processing apparatus 170 of an embodiment of the present disclosure extracts luminance data and saturation data from the input image signal (S920).

[0346] For example, the signal processing device 170 can convert the input image signal to YCbCr format when the input image signal is in RGB format, and extract luminance data by extracting the Y component in the YCbCr format image signal, and extract saturation data by extracting the Cb and Cr components.

[0347] Next, the signal processing device 170 calculates the compensation values ​​for luminance data and saturation data based on the illuminance information outside the vehicle (S930).

[0348] For example, the signal processing device 170 can receive external illuminance information from the external illuminance sensor 711 that detects external illuminance information.

[0349] Next, the signal processing device 170 outputs an image signal based on the compensation values ​​of the calculated luminance data and saturation data (S940).

[0350] This prevents the decrease in visibility caused by external illuminance. In particular, it reduces the decrease in luminance and saturation recognition caused by external illuminance.

[0351] On the other hand, in step S930, the signal processing device 170 can calculate the luminance compensation value based on the average value of the luminance data of the input image signal, and can calculate the saturation compensation value based on the standard deviation of the saturation data of the input image signal. This prevents a decrease in visibility caused by external illumination.

[0352] The average value of the brightness data of the input image signal at this time is the average value of the brightness data of each frame, so it can be the average brightness level (APL).

[0353] On the other hand, the signal processing device 170 can be controlled such that the higher the level of external illuminance information, the greater the compensation values ​​for luminance and saturation data. Therefore, even if the level of external illuminance information increases, visibility degradation can be prevented.

[0354] On the other hand, in step S915, if it is not a compensation mode, the signal processing device 170 confirms whether it is a normal mode (S942). If it is, it can perform a brightness conversion corresponding to the normal mode, and then output the second output image signal after brightness conversion (S945). Thus, an image based on the normal mode can be displayed.

[0355] On the other hand, the signal processing device 170 can be controlled to execute a compensation mode when the illuminance information outside the vehicle is above the reference level, and to execute a normal mode when the illuminance information outside the vehicle is below the reference level.

[0356] On the other hand, the signal processing device 170 can be controlled to execute a compensation mode in daytime driving mode and a normal mode in nighttime driving mode.

[0357] On the other hand, the signal processing device 170 can be controlled to execute the normal mode if it enters the tunnel after executing the compensation mode.

[0358] On the other hand, the signal processing device 170 can be controlled to perform a normal mode inside the tunnel and a compensation mode when leaving the tunnel.

[0359] At this time, the signal processing device 170 can be controlled to gradually execute the intensity of the compensation mode.

[0360] For example, the signal processing device 170 can be controlled such that at the first time point when the vehicle leaves the tunnel, the intensity of the compensation mode becomes a first intensity, and at a second time point after the vehicle leaves the tunnel, the intensity of the compensation mode becomes a second intensity greater than the first intensity. Thus, visibility degradation can be prevented through a progressively changing compensation mode.

[0361] On the other hand, the signal processing device 170 can be controlled to output a first image containing text in normal mode, and to output a second image containing an object or image in compensation mode based on illumination information of the vehicle exterior. For this, refer to... Figure 14 Please provide an explanation.

[0362] Figure 14 This is an explanation Figure 13 The diagram used for reference at the time.

[0363] Referring to the accompanying drawings, the signal processing device 170 can be controlled to, in normal mode, such as Figure 14 As shown in (a), the output is the first image 1410 containing text.

[0364] For example, the first image 1410 may contain velocity information 1412 and distance information 1413 as text.

[0365] On the other hand, the first image 1410 may also include symbols or graphics representing the driving direction information 1415.

[0366] The signal processing device 170 can be controlled to, in compensation mode, such as Figure 14 As shown in (b), the output is a second image 1420 containing an object or image.

[0367] For example, the second image 1420 may contain an object or an image 1435.

[0368] On the other hand, the second image 1420 may contain text in addition to the object or image 1435.

[0369] That is, in addition to the object or image 1435, the second image 1420 may also contain speed information 1412 and distance information 1413 as text.

[0370] On the other hand, the second image 1420 may also include symbols or graphics representing the driving direction information 1415.

[0371] Ultimately, the signal processing device 170 can be controlled to display more information or data in the compensation mode than in the normal mode. This allows for the provision of various information while preventing visibility loss caused by external illuminance.

[0372] On the other hand, the signal processing device 170 can be controlled to output a first image 1410 containing text, followed by a second image 1420 containing an object or image 1435 in addition to text, when switching from normal mode to compensation mode. This prevents a decrease in visibility caused by external illumination.

[0373] On the other hand, the signal processing device 170 can be controlled to output a first image 1410 containing text after outputting a second image 1420 containing image 1435 when switching from compensation mode to normal mode. This prevents a decrease in visibility caused by external illumination.

[0374] On the other hand, the signal processing device 170 can output a second image 1420 containing the image 1435 to the image output device 180t in the compensation mode.

[0375] For example, the image output device 180t may have a head-up display device 180h, which includes an image generating device 300 that outputs a projected image in the direction of the windshield WS. This prevents a decrease in visibility caused by external illuminance in the head-up display device 180h.

[0376] As another example, the image output device 180t may include a display 180b with an organic light-emitting panel. This prevents a decrease in visibility in the organic light-emitting panel-based display 180b caused by external illuminance.

[0377] As another example, the image output device 180t may include a display 180b with a transparent organic light-emitting panel. In this case, the transparency of the transparent organic light-emitting panel may be lower than the transparency of the windshield WS. This prevents a decrease in visibility in the display 180b caused by external illuminance.

[0378] On the other hand, the signal processing apparatus 170 according to another embodiment of this disclosure can be controlled to output a first image 1410 in a normal mode and output a second image 1420 with increased brightness and saturation levels compared to the first image in a compensation mode based on illumination information outside the vehicle. This prevents visibility degradation caused by external illumination.

[0379] The preferred embodiments of the present invention have been illustrated and described above. However, the present invention is not limited to the specific embodiments described above. Without departing from the spirit of the present invention as claimed in the claims, those skilled in the art will obviously be able to make various modifications. Such modifications should not be understood separately from the technical concept or prospect of the present invention.

Claims

1. A display device for a vehicle, wherein include: Illumination sensor detects illumination information outside the vehicle; Image output device, outputs images; as well as The signal processing device outputs an output image signal to the image output device based on the input image signal; The signal processing device extracts luminance data and saturation data from the input image signal, calculates compensation values ​​for the luminance data and saturation data based on the illumination information outside the vehicle, and outputs an output image signal based on the calculated compensation values ​​for the luminance data and saturation data.

2. The vehicle display device according to claim 1, wherein, The signal processing device calculates the compensation value of the luminance data based on the average value of the luminance data of the input image signal; The signal processing device calculates the compensation value of the saturation data based on the standard deviation of the saturation data of the input image signal.

3. The vehicle display device according to claim 1, wherein, The signal processing device controls the illuminance data to be higher and the saturation data to be higher as the level of the external illuminance information of the vehicle is higher.

4. The vehicle display device according to claim 1, wherein, If, when calculating the compensation value of the luminance data based on the illuminance information outside the vehicle, the first luminance level of the input image signal is lower than the reference luminance level, the signal processing device increases the first luminance level by a first luminance increase amount. If, when calculating the compensation value of the luminance data based on the illuminance information outside the vehicle, the second luminance level of the input image signal is higher than the reference luminance level, then the signal processing device increases the second luminance level by a second increase that is smaller than the first luminance increase.

5. The vehicle display device according to claim 1, wherein, If, when calculating the compensation value of the saturation data based on the illumination information outside the vehicle, the first saturation level of the input image signal is lower than the reference saturation level, the signal processing device increases the first saturation level by a first saturation increase amount. If, when calculating the compensation value of the saturation data based on the illumination information outside the vehicle, the second saturation level of the input image signal is higher than the reference saturation level, the signal processing device increases the second saturation level by a second saturation increase that is smaller than the first saturation increase.

6. The vehicle display device according to claim 1, wherein, The signal processing device is controlled to output a first image containing text if it is in normal mode, and a second image containing objects or images if it is in compensation mode based on illumination information outside the vehicle.

7. The vehicle display device according to claim 1, wherein, The signal processing device is controlled such that, if switching from normal mode to compensation mode, it outputs a first image containing text, followed by a second image that, in addition to the text, also includes an object or image.

8. The vehicle display device according to claim 1, wherein, The image output device includes an image generation device that outputs the projected image in the direction of the windshield.

9. The vehicle display device according to claim 1, wherein, The image output device includes a display with an organic light-emitting panel.

10. The vehicle display device according to claim 1, wherein, The image output device includes a display with a transparent organic light-emitting panel; The transparency of the transparent organic light-emitting panel is lower than that of the windshield.

11. A display device for a vehicle, wherein include: Illumination sensor detects illumination information outside the vehicle; Image output device, outputs images; as well as The signal processing device outputs an output image signal to the image output device based on the input image signal; The signal processing device is controlled to output a first image if it is in normal mode, and to output a second image with increased luminance and saturation levels compared to the first image if it is in compensation mode based on the illumination information outside the vehicle.

12. The vehicle display device according to claim 11, wherein, The signal processing device is controlled to output the first image containing text if it is in the normal mode, and to output the second image containing an object or image if it is in the compensation mode based on the illumination information outside the vehicle.

13. The vehicle display device according to claim 11, wherein, The signal processing device is controlled such that, if switching from the normal mode to the compensation mode, it outputs the first image containing text, and then outputs a second image that, in addition to the text, also includes an object or image.

14. The vehicle display device according to claim 11, wherein, The image output device includes an image generation device that outputs the projected image in the direction of the windshield.

15. The vehicle display device according to claim 11, wherein, The image output device includes a display with an organic light-emitting panel.

Images