Display device for vehicle

Abstract

The present disclosure relates to a display device for a vehicle. A display device for a vehicle, according to an embodiment of the present disclosure, includes: an illuminance sensor for sensing information about an illuminance outside a 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 on the basis of an input image signal, wherein the signal processing device extracts luminance data and chroma data from the input image signal, calculates a compensation value of the luminance data and a compensation value of the chroma data on the basis of the information about the illuminance outside the vehicle, and outputs an output image signal based on the calculated compensation value of the luminance data and the calculated compensation value of the chroma data. Accordingly, deterioration of visibility based on external illuminance can be prevented.

Description

Vehicle display device

[0001] The present disclosure relates to a vehicle display device, and more particularly, to a vehicle display device capable of preventing visibility degradation based on external illuminance.

[0002] A vehicle is a device that allows the user to move in the desired direction. A representative example is an automobile.

[0003] Meanwhile, for the convenience of vehicle users, vehicle display devices are being installed inside vehicles.

[0004] For example, displays are placed in clusters and other areas to display various types of information. Meanwhile, vehicles are increasingly equipped with various displays, including a Center Information Display (CID) separate from the cluster, and a head-up display that projects images onto the windshield to display driving information and other information.

[0005] Meanwhile, there is a problem that the visibility of images displayed on head-up displays, etc., is reduced due to external light from outside the vehicle.

[0006] The problem of the present disclosure is to provide a vehicle display device capable of preventing visibility degradation based on external illuminance.

[0007] Meanwhile, another problem of the present disclosure is to provide a vehicle display device capable of reducing the degradation of brightness and saturation perception based on external illuminance.

[0008] According to one embodiment of the present disclosure for achieving the above-described problem, a vehicle display device includes a light sensor for sensing light information outside a 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, wherein the signal processing device extracts luminance data and saturation data from the input image signal, calculates a compensation value of the luminance data and a compensation value of the saturation data based on the illuminance information outside the vehicle, and outputs an output image signal based on the calculated compensation value of the luminance data and the compensation value of the saturation data.

[0009] Meanwhile, the signal processing device can calculate a compensation value of luminance data based on an average value of luminance data of the input image signal, and can calculate a compensation value of saturation data based on a standard deviation of saturation data of the input image signal.

[0010] Meanwhile, the signal processing device can control the compensation value of the luminance data and the compensation value of the saturation data to increase as the level of the external illumination information of the vehicle increases.

[0011] Meanwhile, the signal processing device may, when calculating a compensation value of brightness data based on the illumination information outside the vehicle, increase the first brightness level by a first brightness increase amount when the first brightness level of the input image signal is smaller than a reference brightness level, and increase the second brightness level by a second increase amount that is smaller than the first brightness increase amount when the second brightness level of the input image signal is larger than the reference brightness level.

[0012] Meanwhile, the signal processing device may, when calculating a compensation value of saturation data based on the illumination information outside the vehicle, increase the first saturation level by a first saturation increase amount when the first saturation level of the input image signal is smaller than a reference saturation level, and increase the second saturation level by a second saturation increase amount that is smaller than the first saturation increase amount when the second saturation level of the input image signal is larger than the reference saturation level.

[0013] Meanwhile, the signal processing device can be controlled to output a first image including text in the normal mode, and to output a second image including an object or image in the compensation mode based on the illumination information outside the vehicle.

[0014] Meanwhile, the signal processing device can be controlled to output a first image including text and then output a second image including an object or image in addition to the text when switching from normal mode to compensation mode.

[0015] Meanwhile, the image output device may include an image generating device that outputs a projected image in the direction of the windshield.

[0016] Meanwhile, the video output device may include a display having an organic light-emitting panel.

[0017] Meanwhile, the video output device includes a display having a transparent organic light-emitting panel, and the transparency of the transparent organic light-emitting panel may be less than the transparency of the windshield.

[0018] A vehicle display device according to another embodiment of the present disclosure includes a light sensor for sensing light information outside a 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, wherein the signal processing device controls to output a first image in a normal mode, and outputs a second image having an increased brightness level and saturation level compared to the first image in a compensation mode based on light information outside the vehicle.

[0019] Meanwhile, the signal processing device can be controlled to output a first image including text in the normal mode, and to output a second image including an object or image in the compensation mode based on the illumination information outside the vehicle.

[0020] Meanwhile, the signal processing device can be controlled to output a first image including text and then output a second image including an object or image in addition to the text when switching from normal mode to compensation mode.

[0021] Meanwhile, the image output device may include an image generating device that outputs a projected image in the direction of the windshield.

[0022] Meanwhile, the video output device may include a display having an organic light-emitting panel.

[0023] A vehicle display device according to one embodiment of the present disclosure includes an illuminance sensor for sensing illuminance information outside a 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, wherein the signal processing device extracts luminance data and saturation data from the input image signal, calculates a compensation value of the luminance data and a compensation value of the saturation data based on illuminance information outside the vehicle, and outputs an output image signal based on the calculated compensation value of the luminance data and the compensation value of the saturation data. Accordingly, it is possible to prevent a decrease in visibility based on external illuminance. In particular, it is possible to reduce a decrease in luminance and saturation recognition based on external illuminance.

[0024] Meanwhile, the signal processing device can calculate a compensation value for luminance data based on the average value of luminance data of the input image signal, and calculate a compensation value for saturation data based on the standard deviation of saturation data of the input image signal. Accordingly, it is possible to prevent visibility degradation due to external illuminance.

[0025] Meanwhile, the signal processing device can control the compensation values ​​for luminance data and saturation data to increase as the level of external illumination information increases. This prevents deterioration of visibility due to external illumination.

[0026] Meanwhile, the signal processing device may, when calculating a compensation value for luminance data based on the external illuminance information of the vehicle, increase the first luminance level by a first luminance increase amount when the first luminance level of the input image signal is smaller than a reference luminance level, and increase the second luminance level by a second increase amount that is smaller than the first luminance increase amount when the second luminance level of the input image signal is larger than the reference luminance level. Accordingly, it is possible to prevent a decrease in visibility based on external illuminance.

[0027] Meanwhile, the signal processing device may, when calculating a compensation value for saturation data based on the external illuminance information of the vehicle, increase the first saturation level by the first saturation increase amount when the first saturation level of the input image signal is smaller than the reference saturation level, and increase the second saturation level by the second saturation increase amount that is smaller than the first saturation increase amount when the second saturation level of the input image signal is larger than the reference saturation level. Accordingly, it is possible to prevent a decrease in visibility based on external illuminance.

[0028] Meanwhile, the signal processing device can be controlled to output a first image containing text in normal mode, and to output a second image containing objects or images in compensation mode based on external illumination information. Accordingly, visibility degradation due to external illumination can be prevented.

[0029] Meanwhile, the signal processing device can control the output of a first image containing text when switching from normal mode to compensation mode, and then output a second image containing objects or images in addition to the text. This prevents deterioration of visibility due to external illuminance.

[0030] Meanwhile, the image output device may include an image generation device that outputs a projected image in the direction of the windshield. This prevents visibility degradation due to external illuminance.

[0031] Meanwhile, the video output device may include a display equipped with an organic light-emitting panel. This prevents degradation of visibility due to external lighting.

[0032] Meanwhile, the video output device includes a display having a transparent organic light-emitting panel, the transparency of which may be lower than that of the windshield. Accordingly, visibility degradation due to external illuminance can be prevented.

[0033] According to another embodiment of the present disclosure, a vehicle display device includes an illuminance sensor for sensing illuminance information outside a 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, wherein the signal processing device controls to output a first image in a normal mode, and outputs a second image having an increased luminance level and saturation level compared to the first image in a compensation mode based on illuminance information outside the vehicle. Accordingly, it is possible to prevent a decrease in visibility based on external illuminance. In particular, it is possible to reduce a decrease in luminance and saturation recognition based on external illuminance.

[0034] Meanwhile, the signal processing device can be controlled to output a first image containing text in normal mode, and to output a second image containing objects or images in compensation mode based on external illumination information. Accordingly, visibility degradation due to external illumination can be prevented.

[0035] Meanwhile, the signal processing device can control the output of a first image containing text when switching from normal mode to compensation mode, and then output a second image containing objects or images in addition to the text. This prevents deterioration of visibility due to external illuminance.

[0036] Meanwhile, the image output device may include an image generation device that outputs a projected image in the direction of the windshield. This prevents visibility degradation due to external illuminance.

[0037] Meanwhile, the video output device may include a display equipped with an organic light-emitting panel. This prevents degradation of visibility due to external lighting.

[0038] Figure 1 is a drawing showing an example of the exterior and interior of a vehicle.

[0039] FIG. 2 is a drawing illustrating the appearance of a vehicle display device according to an embodiment of the present disclosure.

[0040] FIG. 3 illustrates an example of an internal block diagram of the vehicle display device of FIG. 2.

[0041] FIGS. 4A to 4C are drawings illustrating various structures of the head-up display of FIG. 3.

[0042] FIG. 4d illustrates an example of the operation of the head-up display of FIGS. 4a to 4c.

[0043] FIG. 5 illustrates an example of an internal block diagram of a vehicle display device according to an embodiment of the present disclosure.

[0044] Figure 6 is an internal block diagram of the second display of Figure 3.

[0045] FIGS. 7A to 7D are drawings for reference in the description of the organic light-emitting panel of FIG. 6.

[0046] FIGS. 8A to 8C are drawings for reference in explaining the operation of a vehicle display device related to the present disclosure.

[0047] FIG. 9 is a flowchart showing an operation method of a vehicle display device according to an embodiment of the present disclosure.

[0048] FIG. 10 is an example of an internal block diagram of a signal processing device according to an embodiment of the present disclosure.

[0049] Figures 11a to 12b are drawings referred to in the description of Figure 9 or Figure 10.

[0050] FIG. 13 is a flowchart showing an operating method of a vehicle display device according to another embodiment of the present disclosure.

[0051] Figure 14 is a drawing referenced in the description of Figure 13.

[0052] Hereinafter, the present disclosure will be described in more detail with reference to the drawings.

[0053] The suffixes "module" and "part" used in the following description are given solely for the convenience of writing this specification and do not impart any particularly significant meaning or role to the components themselves. Therefore, the terms "module" and "part" may be used interchangeably.

[0054] Figure 1 is a drawing showing an example of the exterior and interior of a vehicle.

[0055] Referring to the drawing, the vehicle (200) is operated by a plurality of wheels (103FR, 103FL, 103RL, etc.) that rotate by a power source and a steering wheel (150) for controlling the direction of travel of the vehicle (200).

[0056] Meanwhile, the vehicle (200) may further be equipped with a camera (195) for capturing images of the front of the vehicle.

[0057] Meanwhile, the vehicle (200) may be equipped with multiple displays (180a, 180b, 180h) for displaying images, information, etc. inside.

[0058] For example, among the plurality of displays (180a, 180b, 180h), the first display (180a) may be a cluster display, the second display (180b) may be a CID (Center Information Display), and the third display (180h) may be a HUD display, which is a head-up display (HUD) that projects an image onto a predetermined area (Ara) of a windshield (WS).

[0059] Meanwhile, the vehicle (200) described in this specification may be a concept that includes all of a vehicle equipped with an engine as a power source, a hybrid vehicle equipped with an engine and an electric motor as a power source, and an electric vehicle equipped with an electric motor as a power source.

[0060] FIG. 2 is a drawing illustrating the appearance of a vehicle display device according to an embodiment of the present disclosure.

[0061] A vehicle display device (100) according to an embodiment of the present disclosure may include a signal processing device (170) that performs signal processing for displaying images, information, etc. on at least one of a plurality of displays (180a, 180b, 180h).

[0062] Meanwhile, 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 a plurality of displays (180a, 180b, 180h).

[0063] Among the plurality of displays (180a, 180b, 180h), the first display (180a) may be a cluster display (180a) for displaying driving status, operation information, etc., the second display (180b) may be a CID (Center Information Display) (180b) for displaying vehicle driving information, navigation maps, various entertainment information, or images, and the third display (180h) may be a HUD display for displaying vehicle driving information.

[0064] The signal processing device (170) has a memory (508) and a processor (175) inside and can control at least one of a plurality of displays (180a, 180b, 180h).

[0065] Meanwhile, the signal processing device (170) can execute a first virtual machine to a third virtual machine (not shown) on a hypervisor (505) within a processor (175).

[0066] The first virtual machine (not shown) is a server virtual machine and can control the second virtual machine (not shown) and the third virtual machine (not shown), which are guest virtual machines.

[0067] Meanwhile, the second virtual machine can be named the first guest virtual machine (Guest Virtual Maschine), and the third virtual machine can be named the second guest virtual machine.

[0068] The first guest virtualization machine (not shown) operates for the first display (180a), and the second guest virtualization machine (not shown) can operate for the second display (180b) or the third display (180h).

[0069] Meanwhile, the server virtualization machine (not shown) within the processor (175) can control the memory (508) based on the hypervisor (505) to be set for the same data transmission to the first guest virtualization machine (not shown) and the second guest virtualization machine (not shown). Accordingly, the same information or the same image can be displayed in synchronization on the first display (180a) and the second display (180b) within the vehicle.

[0070] Meanwhile, a server virtualization machine (not shown) within the processor (175) can receive and process wheel speed sensor data of the vehicle, and transmit the processed wheel speed sensor data to at least one of the first guest virtualization machine (not shown) or the second guest virtualization machine (not shown). Accordingly, the wheel speed sensor data of the vehicle can be shared with at least one virtual machine, etc.

[0071] Accordingly, it is possible to control multiple displays (180a, 180b, 180h) using one signal processing device (170).

[0072] Meanwhile, some of the multiple displays (180a, 180b, 180h) may operate under Linux OS, while others may operate under Web OS.

[0073] The signal processing device (170) according to the embodiment of the present disclosure can control multiple displays (180a, 180b, 180h) operating under various operating systems (OS) to display the same information or the same image in synchronization.

[0074] FIG. 3 illustrates an example of an internal block diagram of the vehicle display device of FIG. 2.

[0075] Referring to the drawings, a vehicle display device (100) according to an embodiment of the present disclosure includes an external illuminance sensor (711) that senses illuminance information outside the vehicle, an image output device (180t) that outputs an image, and a signal processing device (170) that outputs an output image signal to the image output device (180t) based on an input image signal.

[0076] Meanwhile, the vehicle display device (100) according to the embodiment of the present disclosure may further include an input unit (110), a communication device (120), an interface (130), a memory (140), an internal light sensor (713), an audio output unit (185), a power supply unit (190), etc.

[0077] Meanwhile, the video output device (180t) may include at least one display (180a, 180b, 180h).

[0078] That is, the image output device (180t) may include at least one of a cluster display (180a), a CID display (180b), or a head-up display (180h).

[0079] The input unit (110) may be equipped with physical buttons, pads, etc. for button input, touch input, etc.

[0080] Meanwhile, the input unit (110) may be equipped with a microphone (not shown) for user voice input.

[0081] The communication device (120) can exchange data wirelessly with a mobile terminal (800) or a server (not shown).

[0082] In particular, the communication device (120) can wirelessly exchange data with the vehicle driver's mobile terminal. Various data communication methods are possible, such as Bluetooth, WiFi, WiFi Direct, and APiX.

[0083] The communication device (120) can receive weather information, road traffic information, for example, TPEG (Transport Protocol Expert Group) information, from a mobile terminal (800) or a server (not shown). To this end, the communication device (120) may be equipped with a mobile communication module (not shown).

[0084] The interface (130) can receive sensor information, etc. from the ECU (770) or sensor device (760) and transmit the received information to the signal processing device (170).

[0085] Here, the sensor information may include at least one of vehicle direction information, vehicle location information (GPS information), vehicle angle information, vehicle speed information, vehicle acceleration information, vehicle inclination information, vehicle forward / backward information, battery information, fuel information, tire information, vehicle lamp information, vehicle interior temperature information, and vehicle interior humidity information.

[0086] Such sensor information may be obtained from a heading sensor, a yaw sensor, a gyro sensor, a position module, a vehicle forward / backward sensor, a wheel sensor, a vehicle speed sensor, a body tilt detection sensor, a battery sensor, a fuel sensor, a tire sensor, a steering sensor based on steering wheel rotation, a vehicle internal temperature sensor, a vehicle internal humidity sensor, etc. Meanwhile, the position module may include a GPS module for receiving GPS information.

[0087] Meanwhile, the interface (130) can receive vehicle front image data, vehicle side image data, vehicle rear image data, vehicle surrounding obstacle distance information, etc. from a camera (195) or a rider (not shown), and transmit the received information to a signal processing device (170).

[0088] The memory (140) can store various data for the overall operation of the vehicle display device (100), such as a program for processing or controlling the signal processing device (170).

[0089] For example, the memory (140) may store data regarding a hypervisor, a server virtualization machine (not shown), and multiple guest virtualization machines for execution within the processor (175).

[0090] The audio output unit (185) converts an electric signal from the signal processing device (170) into an audio signal and outputs it. For this purpose, a speaker or the like may be provided.

[0091] The power supply unit (190) can supply power required for the operation of each component under the control of the signal processing device (170). In particular, the power supply unit (190) can receive power from a battery or the like inside the vehicle.

[0092] The third display, the HUD display (180h), includes an image generating device (300 in FIG. 1) for image projection and can output an augmented reality-based object under the control of a signal processing device (170).

[0093] For example, the HUD display (180h) can output vehicle speed information, vehicle direction information, front vehicle object, distance indicator from the front vehicle, etc.

[0094] As another example, the HUD display (180h) can output an augmented reality rain carpet, an augmented reality route carpet, or an augmented reality dynamic carpet corresponding to the lane image.

[0095] The signal processing device (170) can control multiple displays (180a, 180b, 180h).

[0096] The signal processing device (170) controls the overall operation of each unit within the vehicle display device (100).

[0097] For example, the signal processing device (170) may include a memory (508) and a processor (175) that performs signal processing for a vehicle display (180a, 180b).

[0098] The processor (175) executes a hypervisor (not shown), and can execute a server virtualization machine (not shown) and multiple guest virtualization machines (not shown) on the executed hypervisor.

[0099] At this time, the first guest virtualization machine (not shown) operates for the first display (180a), and the second guest virtualization machine (not shown) can operate for the second display (180b) or the third display (180h).

[0100] Meanwhile, the signal processing device (170) can process various signals such as audio signals, video signals, and data signals. To this end, the signal processing device (170) can be implemented in the form of a system on chip (SOC).

[0101] FIGS. 4A to 4C are drawings illustrating various structures of the head-up display of FIG. 3.

[0102] First, FIG. 4A illustrates an example of a head-up display according to an embodiment of the present disclosure.

[0103] Referring to the drawings, a head-up display (180ha) according to an embodiment of the present disclosure includes a liquid crystal display panel (300x) that outputs a projected image, a fold 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 fold mirror (315x) to a windshield (WS).

[0104] The projection image reflected from a predetermined area (Arx) of the windshield (WS) is output to the driver's field of vision (Ara).

[0105] A concave mirror (325x) within the head-up display (180ha) is positioned between the liquid crystal display panel (300x) and the driver's viewing area (Ara).

[0106] Meanwhile, the concave mirror (325x) within the head-up display (180ha) determines the arrangement of the projected image and the position of the light source.

[0107] For example, by increasing the magnification of the concave mirror (325x) in the head-up display (180ha) and reducing the focal length, the size (CSa) of the head-up display (180ha) can be reduced.

[0108] Next, FIG. 4b illustrates another example of a head-up display according to an embodiment of the present disclosure.

[0109] Referring to the drawings, a head-up display (180hb) according to an embodiment of the present disclosure includes a liquid crystal display panel (300y) that outputs a projection image, a fold mirror (315y) that reflects the projection image from the liquid crystal display panel (300y), a concave mirror (325y) that reflects the projection image from the fold mirror (315y), and a transparent cover (335y) that outputs the projection image from the concave mirror (325y) to a windshield (WS).

[0110] The projection image reflected from a predetermined area (Ary) of the windshield (WS) is output to the driver's field of vision area (Ara).

[0111] Unlike in Fig. 4a, the concave mirror (325y) within the head-up display (180hb) is positioned at the front end of the liquid crystal display panel (300y) and the driver's viewing area (Ara).

[0112] That is, the liquid crystal display panel (300y) within the head-up display (180hb) is placed between the concave mirror (325y) and the driver's viewing area (Ara).

[0113] Meanwhile, the concave mirror (325y) within the head-up display (180hb) determines the arrangement of the projected image and the position of the light source.

[0114] For example, by increasing the magnification of the concave mirror (325y) in the head-up display (180hb) and reducing the focal length, the size (CSb) of the head-up display (180hb) can be reduced.

[0115] Next, FIG. 4c illustrates another example of a head-up display according to an embodiment of the present disclosure.

[0116] Referring to the drawings, a head-up display (180hc) according to one embodiment of the present disclosure includes an image generating device (300) that outputs a projected image in the direction of a windshield (WS), and a mirror (325) that reflects a projected image reflected from a first area (Ra) of the windshield (WS) in the direction of the windshield (WS).

[0117] The projection image from the mirror (325) is reflected from the second area (Rb) of the windshield (WS) and output to the third area (Ara). At this time, the third area (Ara) can correspond to the driver's line of sight.

[0118] Meanwhile, a head-up display (180hc) according to one embodiment of the present disclosure utilizes two reflections from a windshield (WS), thereby enabling a reduction in size while sufficiently securing an optical path.

[0119] That is, the size of the head-up display (180hc) according to one embodiment of the present disclosure is, as CSa, smaller than the size (CSa) of the head-up display (180ha) of FIG. 4a or the size (CSb) of the head-up display (180hb) of FIG. 4b.

[0120] Accordingly, it is possible to reduce the size of a large-screen projection image while implementing it. In particular, the size can be reduced while securing the optical path.

[0121] Meanwhile, the second area (Rb) of the windshield (WS) may be closer to the third area (Ara) than the first area (Ra) of the windshield (WS).

[0122] Meanwhile, the angle of incidence of the projection image incident on the first area (Ra) of the windshield (WS) may be greater than the angle of incidence of the projection image incident on the second area (Rb) of the windshield (WS). Accordingly, it is possible to reduce the size of the projection image while implementing a large-screen image.

[0123] Meanwhile, the image generating device (300) may be closer to the third area (Ara) than the mirror (325).

[0124] Meanwhile, the position of the image generating device (300) can be positioned higher than the position of the mirror (325). Accordingly, it is possible to reduce the size while implementing a large-screen projection image.

[0125] Meanwhile, the image generation device (300) may be equipped with a digital mirror device or a liquid crystal display panel. Accordingly, the projected image can be output to the outside of the image generation device (300).

[0126] For example, the image generating device (300) may include a light source (not shown) and a digital mirror device (not shown) that reflects light output from the light source.

[0127] The light source may include an LED diode or a laser diode.

[0128] Meanwhile, the digital mirror device may include a plurality of digital mirrors. For example, it may include a digital micromirror device (DMD).

[0129] As another example, the image generating device (300) may include a light source (not shown) and a liquid crystal display panel (not shown) that outputs a projection image based on light output from the light source.

[0130] Meanwhile, the liquid crystal display panel can output a projection image of P polarization.

[0131] Meanwhile, the first area (Ra) of the windshield (WS) can correspond to the black masking area or frit area (FZ) of Fig. 1. Accordingly, the brightness of the projection image can be improved.

[0132] Meanwhile, a head-up display (180hc) according to one embodiment of the present disclosure may further include a transparent cover (335) placed between the image generating device (300) and the windshield (WS). Accordingly, the interior of the image generating device (300) can be protected while the projection image can be output to the outside of the image generating device (300).

[0133] Meanwhile, in the head-up display (180ha) of FIG. 4a, the optical path before the first reflection of the projection image output from the liquid crystal display panel (300x) is formed to be smaller than the optical path from the first reflection to the second reflection.

[0134] At this time, the optical path before the first reflection of the projection image output from the liquid crystal display panel (300x) corresponds between the liquid crystal display panel (300x) and the fold mirror (315x), and the optical path after the first reflection and before the second reflection corresponds between the fold mirror (315x) and the concave mirror (325x).

[0135] In particular, in the head-up display (180ha) of Fig. 4a, the optical path before the first reflection of the projection image output from the liquid crystal display panel (300x) is significantly shorter than the optical path after the first reflection and before the second reflection.

[0136] Meanwhile, the optical path before the first reflection of the projection image output from the image generating device (300) of FIG. 4c is longer than the optical path from after the first reflection to before the second reflection.

[0137] The optical path before the first reflection of the projection image output from the image generating device (300) in the head-up display (180hc) in FIG. 4c corresponds between the image generating device (300) and the first area (Ra) of the windshield (WS).

[0138] Meanwhile, the light path from the first reflection to the second reflection within the head-up display (180hc) corresponds between the first area (Ra) of the windshield (WS) and the mirror (325).

[0139] As shown in the drawing, the optical path before the first reflection of the projection image output from the image generating device (300) is formed to be longer than the optical path from after the first reflection to before the second reflection, so that a sufficient optical path can be secured within a head-up display (180hc) of a small size (CS).

[0140] FIG. 4d illustrates an example of the operation of the head-up display of FIGS. 4a to 4c.

[0141] Referring to the drawing, FIG. 4d illustrates that a cluster image (410) is displayed on a screen (Scr) which is a first display (180a), and a virtual HUD image (420) is displayed in a predetermined area (Ara) in front of a windshield (WS).

[0142] According to the head-up display (180ha) of FIG. 4a, the head-up display (180hb) of FIG. 4b, or the head-up display (180hc) of FIG. 4c, as in FIG. 4d, a cluster image (410) can be displayed on a screen (Scr), and a HUD image (430) can be displayed on a predetermined area (Ara) of a windshield (Ws).

[0143] Meanwhile, as shown in Fig. 4d, it is also possible to integrate and implement multiple displays (180a, 180h) to display the area (Ara) where the HUD image is displayed and the area (Arb) where the screen (Scr) is located together.

[0144] FIG. 5 illustrates an example of an internal block diagram of a vehicle display device according to an embodiment of the present disclosure.

[0145] Referring to the drawings, a vehicle display device (100) according to an embodiment of the present disclosure includes an external illuminance sensor (711) that senses illuminance information outside the vehicle, an image output device (180t) that outputs an image, and a signal processing device (170) that outputs an output image signal to the image output device (180t) based on an input image signal.

[0146] Meanwhile, a vehicle display device (100) according to an embodiment of the present disclosure may further include an image generating device (300), an internal illuminance sensor (713) for sensing illuminance information inside the vehicle, and a user input unit (110).

[0147] Meanwhile, the projection image output from the image generating device (300) is output to the windshield (WS) and is projected or reflected on the windshield (WS), which is a reflective medium.

[0148] Meanwhile, the projection image (LTb) reflected from the windshield (WS) can be displayed as a HUD image (Imb) in a predetermined area (Ara).

[0149] Meanwhile, the signal processing device (170) can output a control signal for controlling the image generation device (300) based on external illuminance (Cso) from an external illuminance sensor (711), internal illuminance (Csi) from an internal illuminance sensor (713), or setting input (Csp) from a user input unit (110).

[0150] For example, the signal processing device (170) can control the brightness level of the projection image (LTb) to increase and the saturation level to increase as the external illuminance (Cso) increases.

[0151] As another example, the signal processing device (170) can control the luminance level and saturation level of the projection image (LTb) to decrease as the internal illuminance (Csi) decreases.

[0152] As another example, the signal processing device (170) can control the brightness level and saturation level of the projection image (LTb) to decrease as the setting input (Csp) decreases.

[0153] Accordingly, it is possible to prevent the reduction in visibility of the projected image (LTb) reflected on the windshield (WS).

[0154] Meanwhile, the signal processing device (170) can control the brightness level and saturation level of the projected image (LTb) to increase as the difference between the external illumination outside the vehicle (200) and the internal illumination of the vehicle (200) increases. Accordingly, it is possible to prevent a decrease in the visibility of the projected image (LTb).

[0155] Meanwhile, the image generation device (300) includes an optical output device (400) for optical output.

[0156] Meanwhile, the light output device (400) may include a light source (309) and a digital mirror device (308) that reflects light output from the light source (309).

[0157] For example, the light source (309) may include an LED diode or a laser diode.

[0158] Meanwhile, the digital mirror device (308) may be equipped with a plurality of digital mirrors. For example, it may be equipped with a digital micromirror device (DMD).

[0159] Meanwhile, the image generation device (300) may further include a digital mirror control unit (305) for controlling a digital mirror device (308) and a light source control unit (306) for controlling a light source (309).

[0160] In particular, the image generation device (300) has a processor (370), and the processor (370) may include a digital mirror control unit (305) for controlling a digital mirror device (308) and a light source control unit (306) for controlling a light source (309).

[0161] Meanwhile, the signal processing device (170) may be equipped with an image generation control unit (173) for controlling the image generation device (300).

[0162] Meanwhile, the image generation control unit (173) may be provided within a processor (175) within a signal processing device (170).

[0163] Figure 6 is an internal block diagram of the second display of Figure 3.

[0164] Referring to the drawing, the second display (180b) based on an organic light-emitting panel may include an organic light-emitting panel (210), a first interface unit (230), a second interface unit (231), a timing controller (232), a gate driver (234), a data driver (236), a memory (240), a power supply unit (290), a current detector (510), etc.

[0165] Meanwhile, the second display (180b) receives a video signal (Vd), a first DC power source (V1), and a second DC power source (V2), and can display a predetermined image based on the video signal (Vd).

[0166] Meanwhile, the first interface unit (230) within the second display (180b) can receive a video signal (Vd) and a first DC power source (V1) from the signal processing device (170).

[0167] 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).

[0168] Next, the second interface unit (231) can receive a second DC power supply (V2) from an external power supply unit (190). Meanwhile, the second DC power supply (V2) can be input to the data drive unit (236) within the second display (180b).

[0169] The timing controller (232) can output a data driving signal (Sda) and a gate driving signal (Sga) based on a video signal (Vd).

[0170] For example, when the first interface unit (230) converts an input image signal (Vd) and outputs a converted image signal (va1), the timing controller (232) can output a data driving signal (Sda) and a gate driving signal (Sga) based on the converted image signal (va1).

[0171] The timing controller (232) can receive, in addition to the video signal (Vd) from the signal processing device (170), a control signal, a vertical synchronization signal (Vsync), etc.

[0172] In addition, the timing controller (232) can 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 a control signal, a vertical synchronization signal (Vsync), etc., in addition to a video signal (Vd).

[0173] The data driving signal (Sda) at this time may be a data driving signal for driving RGB subpixels when the panel (210) has RGB subpixels.

[0174] Meanwhile, the data driving signal (Sda) may be a data driving signal for driving RGBW subpixels when the panel (210) has RGBW subpixels.

[0175] Meanwhile, the timing controller (232) can further output a control signal (Cs) to the gate driver (234).

[0176] 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 the data line (DL), respectively, in accordance with the gate driving signal (Sga) and the data driving signal (Sda) from the timing controller (232). Accordingly, the organic light-emitting panel (210) displays a predetermined image.

[0177] Meanwhile, the organic light-emitting panel (210) may include an organic light-emitting layer, and in order to display an image, a plurality of gate lines (GL) and data lines (DL) may be arranged in a matrix form to cross each pixel corresponding to the organic light-emitting layer.

[0178] Meanwhile, the gate line (GL) may also be called a scan line because a scan signal is input.

[0179] Meanwhile, the data driving unit (236) can output a data signal to the organic light-emitting panel (210) based on the second direct current power (V2) from the second interface unit (231).

[0180] The power supply unit (290) can supply various power sources to the gate driver unit (234), the data driver unit (236), the timing controller (232), etc.

[0181] The current detection unit (510) can detect the current flowing in the subpixel of the panel (210). The detected current can be input to a processor (270) or the like for cumulative current calculation.

[0182] Meanwhile, the timing controller (232), gate driver (234), data driver (236), and memory (240) in the drawing can be implemented as a single integrated circuit (IC).

[0183] Accordingly, the timing controller (232), gate driver (234), data driver (236), and memory (240) may be named a drive control unit (285).

[0184] Meanwhile, the drive control unit (285) may include a buffer (not shown) that stores frame data.

[0185] In particular, the timing controller (232) in the drive control unit (285) can output a gate drive signal and a data drive signal based on frame data stored in a buffer (not shown) or memory (240).

[0186] The timing controller (232) or the driving control unit (285) can perform various controls within the second display (180b). For example, it can control the gate driving unit (234), the data driving unit (236), the timing controller (232), etc.

[0187] Meanwhile, the timing controller (232) or the driving control unit (285) can receive information on the current flowing in the subpixel of the panel (210) from the current detection unit (510).

[0188] In addition, the timing controller (232) or the driving control unit (285) can calculate the accumulated current of the subpixels of each panel (210) based on the current information flowing in the subpixels of the panel (210). The calculated accumulated current can be stored in the memory (240).

[0189] Meanwhile, the timing controller (232) or the driving control unit (285) can determine that burn-in has occurred when the accumulated current of the subpixels of each panel (210) exceeds the allowable value.

[0190] For example, the timing controller (232) or the driving control unit (285) may determine that a subpixel of each panel (210) has a burnt-in subpixel if the accumulated current of the subpixel is 300,000 A or more.

[0191] Meanwhile, the timing controller (232) or the driving control unit (285) may determine that a subpixel among the subpixels of each panel (210) is a subpixel predicted to be subject to burn-in when the accumulated current of the subpixel approaches the allowable value.

[0192] Meanwhile, the timing controller (232) or the driving control unit (285) can determine the subpixel with the largest accumulated current as the burn-in prediction subpixel based on the current detected by the current detection unit (510).

[0193] Meanwhile, the timing controller (232) or the driving control unit (285) may predict current information to flow in a subpixel based on an image signal from the signal processing device (170), regardless of the operation of the current detection unit (510), and determine a subpixel in which burn-in is predicted based on the predicted current information.

[0194] FIGS. 7A to 7D are drawings for reference in the description of the organic light-emitting panel of FIG. 6.

[0195] First, FIG. 7a is a drawing showing an example of a pixel in an organic light-emitting panel (210).

[0196] Referring to the drawing, the organic light-emitting panel (210) may have a plurality of scan lines (Scan 1 to Scan n) and a plurality of data lines (R1, G1, B1 to Rm, Gm, Bm) intersecting therewith.

[0197] Meanwhile, a pixel (subpixel) is defined in the intersection area of ​​the scan line and the data line within the organic light-emitting panel (210). In the drawing, a pixel (Pixel) having RGB subpixels (SR1, SG1, SB1) is illustrated.

[0198] Meanwhile, red organic light-emitting diodes, green organic light-emitting diodes, and blue organic light-emitting diodes are placed in the RGB subpixels (SR1, SG1, SB1), respectively.

[0199] Next, FIG. 7b is a drawing showing another example of pixels within the panel (210).

[0200] Referring to the drawing, the panel (210) may have 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 therewith.

[0201] Meanwhile, a pixel (subpixel) is defined in the intersection area of ​​a scan line and a data line within the panel (210). In the drawing, a pixel (Pixel) having RGBW subpixels (SR1, SG1, SB1, SW1) is illustrated.

[0202] Meanwhile, red organic light-emitting diodes, green organic light-emitting diodes, blue organic light-emitting diodes, and white organic light-emitting diodes are placed in the RGBW subpixels (SR1, SG1, SB1, SW1), respectively.

[0203] FIG. 7c illustrates an example of a circuit of a sub-pixel within a pixel of the panel of FIG. 7a or FIG. 7b.

[0204] Referring to the drawing, the sub-pixel circuit (CRTm) may be an active type and include a scan switching element (SW1), a storage capacitor (Cst), a driving switching element (SW2), and an organic light-emitting layer (OLED).

[0205] The scan switching element (SW1) is turned on according to an input scan signal (Vdscan) by connecting a scan line to the gate terminal. When turned on, the input data signal (Vdata) is transmitted to the gate terminal of the driving switching element (SW2) or one end of the storage capacitor (Cst).

[0206] The storage capacitor (Cst) is formed between the gate terminal and the source terminal of the driving switching element (SW2), and stores a predetermined 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).

[0207] For example, if the data signal has different levels according to the PAM (Plus Amplitude Modulation) method, the power level stored in the storage capacitor (Cst) changes depending on the level difference of the data signal (Vdata).

[0208] As another example, when the data signal has different pulse widths according to the Pulse Width Modulation (PWM) method, the power level stored in the storage capacitor (Cst) changes depending on the difference in the pulse width of the data signal (Vdata).

[0209] The driving switching element (SW2) is turned on according to the power level stored in the storage capacitor (Cst). When the driving switching element (SW2) is turned on, a driving current (IOLED) proportional to the stored power level flows to the organic light-emitting layer (OLED). Accordingly, the organic light-emitting layer (OLED) performs a light-emitting operation.

[0210] The organic light-emitting layer (OLED) includes an emission layer (EML) corresponding to a subpixel, 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), and may also include a hole blocking layer.

[0211] Meanwhile, in the drawing, a case in which a p-type MOSFET is used as the scan switching element (SW1) and the driving switching element (SW2) is exemplified, but an n-type MOSFET, or other switching elements such as a JFET, IGBT, or SIC may also be used.

[0212] Meanwhile, a pixel is a hold-type element that continues to emit light in an organic light-emitting layer (OLED) after a scan signal is applied during a unit display period, specifically, during a unit frame.

[0213] Meanwhile, the sub-pixel circuit (CRTm) in the drawing is driven by an active matrix method.

[0214] FIG. 7d illustrates another example of a circuit of a sub-pixel within a pixel of the panel of FIG. 7a or FIG. 7b.

[0215] Referring to the drawing, the organic light-emitting sub-pixel circuit (CRTm) may be of a passive type and may only include an organic light-emitting diode (LED) without a separate switching element.

[0216] As shown in the drawing, the anode of the organic light-emitting diode (LED) is connected to a data line, so that a data signal (Vdata) can be input, and the cathode of the organic light-emitting diode (LED) is connected to a scan line, so that a scan signal (Vscan) can be input.

[0217] Meanwhile, organic light-emitting diodes can emit organic light or non-organic light based on multiple sub-frames in a passive matrix manner.

[0218] Meanwhile, unlike the drawing, the anode of the organic light-emitting diode (LED) may be connected to a scan line, so that a scan signal (Vscan) may be input, and the cathode of the organic light-emitting diode (LED) may be connected to a data line, so that a data signal (Vdata) may be input.

[0219] Meanwhile, the sub-pixel circuit (CRTm) in the drawing is driven by a passive matrix method.

[0220] FIGS. 8A to 8C are drawings for reference in explaining the operation of a vehicle display device related to the present disclosure.

[0221] Figure 8a illustrates an example of a display image based on an input image and external illumination.

[0222] Referring to the drawing, the input image (810) of (a) of FIG. 8a may have a low-gray area (ARa) in which the luminance level is lower than the reference level, and a saturation area (Arb) centered on saturation.

[0223] Meanwhile, as the level of external illumination increases, as shown in (b) of Fig. 8a, the luminance level of the low-gray area (Araa) of the display image (815) decreases, making it difficult to distinguish low-gray areas, and the saturation level within the saturation area (Arba) decreases, making it difficult to distinguish saturation.

[0224] Figure 8b illustrates the change in color space according to external illuminance.

[0225] Referring to the drawing, (a) of Fig. 8b illustrates a CIE-based color space.

[0226] As the level of external illumination increases, the color space shrinks from the largest range, RGa, to the smallest range, RGb. Therefore, as the level of external illumination increases, color expression deteriorates.

[0227] Referring to the drawing, (b) of Fig. 8b illustrates a CIELAB-based color space.

[0228] As the level of external illumination increases, the color space shrinks from the largest range (RGm) to the smallest range (RGn). Therefore, as the level of external illumination increases, color expression deteriorates.

[0229] Figure 8c illustrates the change in luminance level according to external illuminance.

[0230] Referring to the drawing, (a) of Fig. 8c illustrates various examples of conversion graphs of output luminance versus input luminance according to changes in external illuminance.

[0231] As the level of external illuminance increases, the luminance conversion graph moves from the GRa graph, which has the largest luminance range, to the GRf graph, which has the smallest luminance range, and thus, it can be perceived that luminance level conversion is performed. Therefore, as the level of external illuminance increases, luminance expressiveness decreases.

[0232] Referring to the drawing, (b) of Fig. 8c illustrates various examples of CIELAB-based luminance conversion graphs according to changes in external illuminance.

[0233] As the level of external illuminance increases, the luminance conversion graph moves from the GR1 graph, which has the largest luminance range, to the GR6 graph, which has the smallest luminance range, and accordingly, it can be perceived that luminance level conversion is performed. Therefore, as the level of external illuminance increases, luminance expressiveness decreases.

[0234] Accordingly, this disclosure proposes a method for preventing visibility degradation due to external illuminance. In particular, it proposes a method for reducing the degradation of luminance and saturation perception due to external illuminance.

[0235] FIG. 9 is a flowchart showing an operation method of a vehicle display device according to an embodiment of the present disclosure.

[0236] Referring to the drawing, a signal processing device (170) in a vehicle display device (100) according to one embodiment of the present disclosure receives an input image signal (S910).

[0237] The input video signal at this time may be a video signal received from a server (900), a video signal received from a mobile terminal (800), a camera video signal received from a camera (195), or a video signal stored in a memory (140).

[0238] Next, a signal processing device (170) according to an embodiment of the present disclosure extracts luminance data and saturation data from an input image signal (S920).

[0239] For example, if the format of the input image signal is RGB format, the signal processing device (170) can convert it to YCbCr format, extract the Y component from the image signal in YCbCr format to extract luminance data, and extract the Cb and Cr components to extract saturation data.

[0240] Next, the signal processing device (170) calculates a compensation value for luminance data and a compensation value for saturation data based on the illumination information outside the vehicle (S930).

[0241] For example, the signal processing device (170) can receive illumination information outside the vehicle from an external illumination sensor (711) that senses illumination information outside the vehicle.

[0242] Next, the signal processing device (170) outputs an output image signal based on the compensation value of the calculated luminance data and the compensation value of the saturation data (S940).

[0243] Accordingly, it is possible to prevent degradation of visibility due to external illuminance. In particular, it is possible to reduce degradation of luminance and saturation perception due to external illuminance.

[0244] Meanwhile, in step 930 (S930), the signal processing device (170) can calculate a compensation value for luminance data based on the average value of luminance data of the input image signal, and can calculate a compensation value for saturation data based on the standard deviation of saturation data of the input image signal. Accordingly, it is possible to prevent a decrease in visibility based on external illuminance.

[0245] The average value of the luminance data of the input video signal at this time may be the average luminance level (Average Picture Level; APL), which is the average value of the luminance data for each frame.

[0246] Meanwhile, the signal processing device (170) can control the compensation value of luminance data and saturation data to increase as the level of external illumination information increases. Accordingly, even if the level of external illumination information increases, a decrease in visibility can be prevented.

[0247] FIG. 10 is an example of an internal block diagram of a signal processing device (170) according to one embodiment of the present disclosure.

[0248] Referring to the drawings, a signal processing device (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).

[0249] First, the data conversion unit (1010) within the signal processing device (170) can convert the input image signal into YCbCr format when the format is RGB format.

[0250] Meanwhile, the data conversion unit (1010) within the signal processing device (170) can bypass without data conversion when the format of the input image signal is YCbCr format.

[0251] Next, the luminance data extraction unit (1015) within 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).

[0252] Meanwhile, the saturation data extraction unit (1018) within the signal processing device (170) can extract saturation data by extracting Cb and Cr components from the YCbCr format video signal from the data conversion unit (1010).

[0253] Next, the luminance compensation unit (1025) within the signal processing device (170) can calculate a compensation value of the luminance data of the extracted luminance data based on the external illuminance level (DTc).

[0254] For example, the luminance compensation unit (1025) in the signal processing device (170) can calculate a compensation value of luminance data based on the average value of luminance data of the input image signal.

[0255] Meanwhile, the brightness compensation unit (1025) within the signal processing device (170) can calculate a compensation value of brightness data based on the external illuminance level (DTc) compared to the maximum displayable brightness of the display.

[0256] For example, the luminance compensation unit (1025) within the signal processing device (170) can control the luminance data compensation value to decrease as the level of the maximum displayable luminance of the display increases.

[0257] Meanwhile, the brightness compensation unit (1025) within the signal processing device (170) can control the compensation value of the brightness data to increase as the level of the external illumination information of the vehicle increases.

[0258] In addition, the luminance compensation unit (1025) within the signal processing device (170) can output compensation luminance data that is the sum of the compensation value of the luminance data and the luminance data.

[0259] Next, the saturation compensation unit (1028) within the signal processing device (170) can calculate a compensation value of the saturation data of the extracted saturation data based on the external illuminance level (DTc).

[0260] For example, the saturation compensation unit (1028) within the signal processing device (170) can calculate a compensation value of saturation data based on the standard deviation of saturation data of the input image signal.

[0261] Meanwhile, the saturation compensation unit (1028) within the signal processing device (170) can calculate a compensation value of the luminance data based on the external illuminance level (DTc) compared to the maximum displayable luminance of the display.

[0262] For example, the saturation compensation unit (1028) of the signal processing device (170) can control the compensation value of the saturation data to decrease as the level of the maximum displayable luminance of the display increases.

[0263] Meanwhile, the saturation compensation unit (1028) within the signal processing device (170) can control the compensation value of the saturation data to increase as the level of the external illumination information of the vehicle increases.

[0264] In addition, the saturation compensation unit (1028) within the signal processing device (170) can output compensation saturation data that is the sum of the compensation value of the saturation data and the saturation data.

[0265] Meanwhile, the data synthesis unit (1030) within the signal processing device (170) can synthesize compensation luminance data and compensation saturation data.

[0266] Next, the data conversion unit (1040) within the signal processing device (170) converts the image signal based on the YCbCr format from the data synthesis unit (1030) into an image signal based on the RGB format, and outputs an output image signal.

[0267] Accordingly, it is possible to prevent degradation of visibility due to external illuminance. In particular, it is possible to reduce degradation of luminance and saturation perception due to external illuminance.

[0268] Figures 11a to 12b are drawings referred to in the description of Figure 9 or Figure 10.

[0269] Figure 11a illustrates the work of luminance compensation based on external illuminance.

[0270] Referring to the drawing, the signal processing device (170) can convert the luminance level of an input image signal based on a reference conversion graph, GRr, and output an output image signal having the converted luminance level.

[0271] Meanwhile, as the level of external illumination increases, the luminance conversion perceived by users, such as drivers, shifts from the GR1 graph toward the GR6 graph, as shown in (b) of Fig. 8c, and can be perceived as a luminance level conversion being performed. Accordingly, as the level of external illumination increases, luminance expressivity deteriorates.

[0272] Figure 11a (a) illustrates the GR6 graph, which has the highest level of external illuminance among the GR1 to GR6 graphs of Figure 8c (b), and the GR3 graph, which has a lower level of external illuminance than GR6.

[0273] Next, (b) of Fig. 11a illustrates a luminance compensation graph corresponding to the GR3 graph and GR6 graph of (a) of Fig. 11a.

[0274] The signal processing device (170) according to the embodiment of the present disclosure can control the compensation value of the luminance data to increase as the level of external illuminance increases.

[0275] For example, the signal processing device (170) can control luminance conversion to be performed based on the GR6c graph, which has the largest compensation value of luminance data, corresponding to the GR6 graph, which has the largest level of external illuminance.

[0276] Meanwhile, the GR6c graph may have a lower level of output luminance compared to the input luminance compared to the reference graph GRr, but it is desirable that the rate of change of output luminance compared to the input luminance, i.e., the instantaneous slope, be greater.

[0277] Meanwhile, the signal processing device (170) can control luminance conversion to be performed based on the GR3c graph for compensation of luminance data, so that the level of external illuminance corresponds to the GR3 graph.

[0278] At this time, the GR3c graph may have a lower level of output luminance compared to the input luminance compared to the reference graph GRr, but it is desirable that the rate of change of output luminance compared to the input luminance, i.e., the instantaneous slope, be greater.

[0279] Meanwhile, the GR3c graph may have a higher level of output luminance compared to the input luminance than the GR6c graph, but it is desirable that the rate of change of output luminance compared to the input luminance, i.e., the instantaneous slope, be smaller.

[0280] Ultimately, the signal processing device (170) can control the luminance conversion to correspond to the reference graph (GRr) when converting luminance, as shown in (c) of Fig. 11a, based on the luminance compensation value based on the external illuminance level. Accordingly, even if the illuminance level outside the vehicle changes, it is possible to prevent a decrease in visibility.

[0281] Figure 11b illustrates the work of saturation compensation based on external illuminance.

[0282] Referring to the drawing, the signal processing device (170) can output an output image signal having a converted saturation level by converting the saturation level of the input image signal based on a reference conversion graph, GRrf.

[0283] Meanwhile, as the level of external illumination increases, the saturation transformation perceived by users, such as drivers, shifts from the GRrf graph toward the GRf1 graph, and can be perceived as a saturation level transformation. Therefore, as the level of external illumination increases, the saturation expressiveness decreases.

[0284] In particular, Fig. 11b illustrates a Gf1 graph with the highest level of external illuminance and a GRf2 graph with a lower level of external illuminance than Gf1.

[0285] Meanwhile, the signal processing device (170) according to the embodiment of the present disclosure can control the compensation value of saturation data to increase as the level of external illuminance increases.

[0286] For example, the signal processing device (170) can control saturation conversion to be performed based on the GRc1 graph having the largest compensation value of saturation data, corresponding to the GRf1 graph having the largest level of external illuminance.

[0287] Meanwhile, it is desirable that the GRc1 graph has a higher level of output saturation compared to the input saturation compared to the reference graph GRrf.

[0288] Meanwhile, the signal processing device (170) can control saturation conversion to be performed based on the GRc2 graph for compensation of saturation data, so that the level of external illuminance corresponds to the GRf2 graph.

[0289] At this time, the GRc2 graph may have a higher level of output saturation compared to the input saturation compared to the reference graph GRrf.

[0290] Meanwhile, it is desirable that the GRc2 graph have a better level of output saturation compared to input saturation than the GRc1 graph.

[0291] Ultimately, the signal processing device (170) can control the saturation conversion to correspond to the reference graph (GRrf) when converting saturation, as shown in (c) of Fig. 11b, based on the saturation compensation value based on the external illuminance level. Accordingly, even if the illuminance level outside the vehicle changes, visibility degradation can be prevented.

[0292] Figure 11c illustrates the work of saturation compensation based on external illuminance.

[0293] Referring to the drawing, the saturation area can be divided into red and green sections on the horizontal axis and yellow and blue sections on the vertical axis.

[0294] Meanwhile, the first saturation data (IDa) includes a red component and a yellow component, and the ratio of the yellow component to the red component is θ, and the level corresponding to the size can be defined as Ra.

[0295] Meanwhile, when the external illuminance level is the first level, the first saturation data (IDa) can be recognized as the second saturation data (IDb).

[0296] At this time, the second saturation data (IDb) includes a red component and a yellow component, and the ratio of the yellow component to the red component is θ, and the level corresponding to the size can be defined as Rb, which is smaller than Ra. Accordingly, visibility due to external illumination is reduced.

[0297] In order to prevent such degradation of visibility, the signal processing device (170) according to the embodiment of the present disclosure can calculate the compensation value of saturation data based on the standard deviation of the saturation data of the input image signal, since the level of the standard deviation of the saturation data of the input image signal can be more accurate as a compensation value of the saturation data than the average value of the saturation data of the input image signal.

[0298] That is, a compensation value for saturation data can be calculated based on the standard deviation of the saturation data of the input image signal. This prevents degradation of visibility due to external illuminance.

[0299] That is, the signal processing device (170) can calculate a compensation value of the saturation data corresponding to Ra-Rb and control to compensate the saturation data based on this, in order to prevent the first saturation data (IDa) from being recognized as the second saturation data (IDb).

[0300] Accordingly, the first saturation data (IDa) can be controlled to be recognized as the first saturation data (IDa) despite the external illumination.

[0301] Meanwhile, if the external illuminance level is less than the first level, the first saturation data (IDa) can be recognized as the third saturation data (IDc).

[0302] At this time, the third saturation data (IDc) includes a red component and a yellow component, and the ratio of the yellow component to the red component is θ, and the level corresponding to the size can be defined as Rc, which is smaller than Ra and larger than Rb. Accordingly, visibility due to external illumination is reduced.

[0303] Meanwhile, the signal processing device (170) according to the embodiment of the present disclosure can calculate a compensation value of saturation data corresponding to Ra-Rc and control to compensate the saturation data based on this, in order to prevent the first saturation data (IDa) from being recognized as the third saturation data (IDc). At this time, the saturation compensation value Ra-Rc is preferably smaller than Ra-Rb.

[0304] Accordingly, the first saturation data (IDa) can be controlled to be recognized as the first saturation data (IDa) despite the external illumination.

[0305] Figure 11d illustrates a compensated luminance graph compensated based on external illuminance.

[0306] Referring to the drawing, luminance conversion of the input image signal can be performed based on the reference graph GRra.

[0307] That is, the signal processing device (170) can convert the luminance level of the input image signal on the horizontal axis into the luminance level of the output image signal on the vertical axis.

[0308] Meanwhile, the signal processing device (170) according to the embodiment of the present disclosure can be controlled to calculate a compensation value corresponding to the first level when the level of external illuminance is a first level, and perform luminance conversion based on a first luminance conversion graph (GRLa) including the compensation value. Accordingly, it is possible to prevent visibility degradation based on external illuminance.

[0309] Meanwhile, compared to the reference graph (GRra), it is desirable that the luminance level of the output image signal be higher according to the first luminance conversion graph (GRLa).

[0310] Meanwhile, the signal processing device (170) according to the embodiment of the present disclosure can be controlled to calculate a compensation value corresponding to the second level when the level of external illuminance is a second level lower than the first level, and perform luminance conversion based on a second luminance conversion graph (GRLb) including the compensation value. Accordingly, it is possible to prevent visibility degradation based on external illuminance.

[0311] Meanwhile, compared to the reference graph (GRra), it is desirable that the luminance level of the output image signal be higher according to the first luminance conversion graph (GRLa).

[0312] Meanwhile, compared to the first luminance conversion graph (GRLa), it is desirable for the luminance level of the output image signal to be lower according to the second luminance conversion graph (GRLb).

[0313]

[0314] Meanwhile, the signal processing device (170) may, when calculating a compensation value for brightness data based on the external illuminance information of the vehicle, increase the first brightness level by a first brightness increase amount when the first brightness level of the input image signal is smaller than a reference brightness level, and increase the second brightness level by a second increase amount that is smaller than the first brightness increase amount when the second brightness level of the input image signal is larger than the reference brightness level. Accordingly, it is possible to prevent a decrease in visibility based on external illuminance.

[0315] As shown in the drawing, according to the first luminance conversion graph (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 can be converted to approximately 0.45, and the second luminance level of the input image signal can be converted to approximately 0.75.

[0316] That is, according to the first luminance conversion graph (GRLa), the first luminance increase of the first luminance level may be approximately 0.25, which is 0.45-0.2, and the second luminance increase of the second luminance level may be approximately 0.15, which is 0.75-0.6.

[0317] Ultimately, the first luminance increase is greater than the second luminance increase. Consequently, visibility degradation due to external illuminance can be prevented. In particular, visibility degradation of low-level tones due to external illuminance can be prevented.

[0318] Figure 11e illustrates the output of the compensated image compared to the input image.

[0319] Referring to the drawing, a signal processing device (170) according to an embodiment of the present disclosure receives an input image (1210) and separates luminance data and saturation data within the input image (1210).

[0320] Next, the signal processing device (170) can calculate a compensation value of luminance data based on the level of external illuminance, and generate a compensated luminance-based image (1215) based on the compensation value of luminance data.

[0321] Next, the signal processing device (170) can calculate a compensation value of saturation data based on the level of external illuminance, and generate a compensated saturation-based image (1218) based on the compensation value of saturation data.

[0322] Next, the signal processing device (170) can output a compensated image (1220) by synthesizing the compensated luminance-based image (1215) and the compensated saturation-based image (1218). Accordingly, an image with compensated luminance and saturation can be output based on external illuminance. Consequently, visibility degradation due to external illuminance can be prevented.

[0323] Figure 12a illustrates a compensated saturation graph compensated based on external illuminance.

[0324] Referring to the drawing, saturation conversion of the input image signal can be performed based on the reference graph GRrb.

[0325] That is, the signal processing device (170) can convert the saturation level of the input image signal on the horizontal axis into the saturation level of the output image signal on the vertical axis.

[0326] Meanwhile, the signal processing device (170) according to the embodiment of the present disclosure can be controlled to calculate a compensation value corresponding to the first level when the level of external illuminance is a first level, and perform saturation conversion based on a first saturation conversion graph (GRCa) including the compensation value. Accordingly, it is possible to prevent visibility degradation based on external illuminance.

[0327] Meanwhile, compared to the reference graph (GRrb), it is desirable that the saturation level of the output image signal be higher according to the first saturation conversion graph (GRCa).

[0328] Accordingly, saturation compensation is performed efficiently in the high saturation region (ARcc) above the reference saturation.

[0329] Meanwhile, the signal processing device (170) according to the embodiment of the present disclosure can be controlled to calculate a compensation value corresponding to the second level when the level of external illuminance is a second level lower than the first level, and perform saturation conversion based on a second saturation conversion graph (GRCb) including the compensation value. Accordingly, it is possible to prevent visibility degradation based on external illuminance.

[0330] Meanwhile, compared to the reference graph (GRrb), it is desirable that the saturation level of the output image signal be higher according to the first saturation conversion graph (GRCa).

[0331] Meanwhile, compared to the first saturation conversion graph (GRCa), it is desirable for the saturation level of the output image signal to be lower according to the second saturation conversion graph (GRCb).

[0332] Meanwhile, the signal processing device (170) may, when calculating a compensation value for saturation data based on the illumination information outside the vehicle, increase the first saturation level by the first saturation increase amount when the first saturation level of the input image signal is smaller than the reference saturation level, and increase the second saturation level by the second saturation increase amount that is smaller than the first saturation increase amount when the second saturation level of the input image signal is larger than the reference saturation level. Accordingly, it is possible to prevent a decrease in visibility based on the external illumination.

[0333] As shown in the drawing, according to the first saturation conversion graph (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.

[0334] That is, according to the first saturation transformation graph (GRLa), the first saturation increase of the first saturation level may be approximately 0.15, which is 0.35-0.2, and the second saturation increase of the second saturation level may be approximately 0.08, which is 0.48-0.4.

[0335] Ultimately, the first saturation increase is greater than the second saturation increase. Consequently, visibility degradation due to external illuminance can be prevented. In particular, visibility degradation due to low saturation caused by external illuminance can be prevented.

[0336] Figure 12b illustrates an example of an image projected onto a windshield.

[0337] Referring to the drawing, the image output device (180t) according to the embodiment of the present disclosure can output a first image (1222) without compensating for external illuminance to the windshield (WS).

[0338] Meanwhile, the image output device (180t) according to the embodiment of the present disclosure can output a second image (1225) with brightness and saturation compensated based on external illuminance to the windshield (WS).

[0339] Comparing the first image (1222) and the second image (1225), it can be seen that the luminance level increases further, the saturation level increases further, and the clarity, etc., are improved. Accordingly, it is possible to prevent visibility degradation due to external illuminance.

[0340] FIG. 13 is a flowchart showing an operating method of a vehicle display device according to another embodiment of the present disclosure.

[0341] Referring to the drawing, a signal processing device (170) in a vehicle display device (100) according to another embodiment of the present disclosure receives an input image signal (S910).

[0342] Next, a signal processing device (170) according to an embodiment of the present disclosure determines whether it is a compensation mode that compensates for external illuminance (S915), and if so, executes the compensation mode.

[0343] That is, according to the compensation mode, the signal processing device (170) according to one embodiment of the present disclosure extracts luminance data and saturation data from the input image signal (S920).

[0344] For example, if the format of the input image signal is RGB format, the signal processing device (170) can convert it to YCbCr format, extract the Y component from the image signal in YCbCr format to extract luminance data, and extract the Cb and Cr components to extract saturation data.

[0345] Next, the signal processing device (170) calculates a compensation value for luminance data and a compensation value for saturation data based on the illumination information outside the vehicle (S930).

[0346] For example, the signal processing device (170) can receive illumination information outside the vehicle from an external illumination sensor (711) that senses illumination information outside the vehicle.

[0347] Next, the signal processing device (170) outputs an output image signal based on the compensation value of the calculated luminance data and the compensation value of the saturation data (S940).

[0348] Accordingly, it is possible to prevent degradation of visibility due to external illuminance. In particular, it is possible to reduce degradation of luminance and saturation perception due to external illuminance.

[0349] Meanwhile, in step 930 (S930), the signal processing device (170) can calculate a compensation value for luminance data based on the average value of luminance data of the input image signal, and can calculate a compensation value for saturation data based on the standard deviation of saturation data of the input image signal. Accordingly, it is possible to prevent a decrease in visibility based on external illuminance.

[0350] The average value of the luminance data of the input video signal at this time may be the average luminance level (Average Picture Level; APL), which is the average value of the luminance data for each frame.

[0351] Meanwhile, the signal processing device (170) can control the compensation value of luminance data and saturation data to increase as the level of external illumination information increases. Accordingly, even if the level of external illumination information increases, a decrease in visibility can be prevented.

[0352] Meanwhile, if it is not a compensation mode in step 915 (S915), the signal processing device (170) determines whether it is a normal mode (S942), and if so, performs a luminance conversion corresponding to the normal mode, and then outputs a second output image signal that has been luminance-converted (S945). Accordingly, an image based on the normal mode can be displayed.

[0353] Meanwhile, the signal processing device (170) can be controlled to execute compensation mode when the illumination information outside the vehicle is above a reference level, and to execute normal mode when the illumination information outside the vehicle is below the reference level.

[0354] Meanwhile, the signal processing device (170) can be controlled to execute the compensation mode when in daytime driving mode and to execute the normal mode when in nighttime driving mode.

[0355] Meanwhile, the signal processing device (170) can be controlled to execute the normal mode when entering a tunnel while executing the compensation mode.

[0356] Meanwhile, the signal processing device (170) can be controlled to execute the compensation mode when exiting the tunnel while executing the normal mode within the tunnel.

[0357] At this time, the signal processing device (170) can control the intensity of the compensation mode to be executed step by step.

[0358] For example, the signal processing device (170) can control the intensity of the compensation mode to be the first intensity when the vehicle has exited the tunnel at the first time point, and can control the intensity of the compensation mode to be the second intensity greater than the first intensity when the vehicle has exited the tunnel at the second time point subsequent to the first time point. Accordingly, visibility degradation can be prevented in stages by the step-by-step compensation mode.

[0359] Meanwhile, the signal processing device (170) can be controlled to output a first image including text in the normal mode, and to output a second image including an object or image in the compensation mode based on the external illumination information of the vehicle. This is described with reference to FIG. 14.

[0360] Figure 14 is a drawing referenced in the description of Figure 13.

[0361] Referring to the drawing, the signal processing device (170) can be controlled to output a first image (1410) including text, as in (a) of FIG. 14, when in normal mode.

[0362] For example, the first image (1410) may include textual velocity information (1412) and distance information (1413).

[0363] Meanwhile, the first image (1410) may further include a symbol or shape including direction information (1415).

[0364] The signal processing device (170), when in compensation mode, can be controlled to output a second image (1420) including an object or image, as shown in (b) of FIG. 14.

[0365] For example, the second image (1420) may include an object or image (1435).

[0366] Meanwhile, the second image (1420) may include text in addition to the object or image (1435).

[0367] That is, the second image (1420) may further include textual velocity information (1412) and distance information (1413) in addition to the object or image (1435).

[0368] Meanwhile, the second image (1420) may further include a symbol or shape including direction information (1415).

[0369] Ultimately, the signal processing device (170) can be controlled to display more information or data in the compensation mode than in the normal mode. Accordingly, it is possible to provide a variety of information while preventing visibility degradation due to external illumination.

[0370] Meanwhile, when switching from normal mode to compensation mode, the signal processing device (170) can be controlled to output a first image (1410) including text, and then output a second image (1420) including an object or image (1435) in addition to the text. Accordingly, it is possible to prevent visibility degradation based on external illumination.

[0371] Meanwhile, the signal processing device (170) can control the output of a second image (1420) including an image (1435) when switching from compensation mode to normal mode, and then output a first image (1410) including text. Accordingly, it is possible to prevent visibility degradation based on external illumination.

[0372] Meanwhile, the signal processing device (170) can output a second image (1420) including an image (1435) to the image output device (180t) in compensation mode.

[0373] For example, the image output device (180t) may include a head-up display device (180h) that includes an image generation device (300) that outputs a projected image in the direction of the windshield (WS). Accordingly, it is possible to prevent a decrease in visibility based on external illumination in the head-up display device (180h).

[0374] As another example, the image output device (180t) may include a display (180b) equipped with an organic light-emitting panel. Accordingly, it is possible to prevent a decrease in visibility due to external illumination in a display (180b) based on an organic light-emitting panel.

[0375] As another example, the image output device (180t) may include a display (180b) equipped with a transparent organic light-emitting panel. In this case, the transparency of the transparent organic light-emitting panel may be lower than that of the windshield (WS). Accordingly, a decrease in visibility due to external illumination in the display (180b) based on the transparent organic light-emitting panel can be prevented.

[0376] Meanwhile, a signal processing device (170) according to another embodiment of the present disclosure controls to output a first image (1410) in the normal mode, and outputs a second image (1420) having a higher brightness level and saturation level than the first image in the compensation mode based on the external illuminance information of the vehicle. Accordingly, it is possible to prevent a decrease in visibility based on external illuminance.

[0377] Although the preferred embodiments of the present disclosure have been illustrated and described above, the present disclosure is not limited to the specific embodiments described above, and various modifications may be made by a person skilled in the art to which the present invention pertains without departing from the gist of the present disclosure as claimed in the claims, and such modifications should not be individually understood from the technical idea or prospect of the present disclosure.

Claims

1. A light sensor that senses light information outside the vehicle; A video output device that outputs video; A signal processing device that outputs an output image signal to the image output device based on an input image signal; The above signal processing device, A vehicle display device that extracts luminance data and saturation data from the input image signal, calculates a compensation value of the luminance data and a compensation value of the saturation data based on illumination information outside the vehicle, and outputs an output image signal based on the calculated compensation value of the luminance data and the compensation value of the saturation data.

2. In paragraph 1, The above signal processing device, Based on the average value of the luminance data of the input image signal, a compensation value of the luminance data is calculated, A vehicle display device that calculates a compensation value of the saturation data based on the standard deviation of the saturation data of the input image signal.

3. In paragraph 1, The above signal processing device, A vehicle display device that controls the compensation value of the luminance data and the compensation value of the saturation data to increase as the level of the external illumination information of the vehicle increases.

4. In paragraph 1, The above signal processing device, When calculating the compensation value of the luminance data based on the external illuminance information of the vehicle, If the first luminance level of the input image signal is less than the reference luminance level, the first luminance level is increased by the first luminance increase amount, A vehicle display device that increases the second luminance level by a second increase amount that is smaller than the first luminance increase amount when the second luminance level of the input image signal is greater than the reference luminance level.

5. In paragraph 1, The above signal processing device, When calculating the compensation value of the saturation data based on the illumination information outside the vehicle, If the first saturation level of the input image signal is less than the reference saturation level, the first saturation level is increased by the first saturation increase amount, A vehicle display device, wherein when the second saturation level of the input image signal is greater than the reference saturation level, the second saturation level is increased by a second saturation increase amount that is smaller than the first saturation increase amount.

6. In paragraph 1, The above signal processing device, A vehicle display device that is controlled to output a first image including text when in normal mode, and to output a second image including an object or image when in compensation mode based on illumination information outside the vehicle.

7. In paragraph 1, The above signal processing device, A vehicle display device that, when switching from normal mode to compensation mode, outputs a first image including text, and then controls the output of a second image including an object or image in addition to the text.

8. In paragraph 1, The above video output device, A vehicle display device including an image generating device that outputs a projected image in the direction of a windshield.

9. In paragraph 1, The above video output device, A vehicle display device comprising a display having an organic light-emitting panel.

10. In paragraph 1, The above video output device, Includes a display having a transparent organic light-emitting panel, A vehicle display device wherein the transparency of the above transparent organic light-emitting panel is less than the transparency of the windshield.

11. A light sensor that senses the light information outside the vehicle; A video output device that outputs video; A signal processing device that outputs an output image signal to the image output device based on an input image signal; The above signal processing device, A vehicle display device that, in normal mode, controls to output a first image, and in compensation mode based on illumination information outside the vehicle, outputs a second image having a brightness level and saturation level increased compared to the first image.

12. In paragraph 11, The above signal processing device, A vehicle display device that, in the case of the normal mode, controls to output the first image including text, and in the case of the compensation mode based on the illumination information outside the vehicle, controls to output the second image including an object or image.

13. In paragraph 11, The above signal processing device, A vehicle display device that, when switching from the normal mode to the compensation mode, outputs the first image including text, and then controls the second image including an object or image in addition to the text.

14. In paragraph 11, The above video output device, A vehicle display device including an image generating device that outputs a projected image in the direction of a windshield.

15. In paragraph 11, The above video output device, A vehicle display device comprising a display having an organic light-emitting panel.

Images