阅读说明：本技术 车辆及用于车辆的图像显示方法 (Vehicle and image display method for vehicle ) 是由 金晓珍 黄禹轸 于 2020-12-28 设计创作，主要内容包括：一种用于防止显示器颜色根据驾驶员的视角而失真的图像显示方法,并且用于车辆的图像显示方法可以包括：追踪驾驶员的视线；确定显示器与驾驶员的视线之间形成的角度；从预先存储的增益补偿表加载与确定的角度相对应的增益值；将加载的增益值应用至显示器上显示的图像数据；以及在显示器上显示已经应用增益值的图像数据。(An image display method for preventing display colors from being distorted according to a viewing angle of a driver, and an image display method for a vehicle may include: tracking the driver's gaze; determining an angle formed between the display and a driver's line of sight; loading a gain value corresponding to the determined angle from a pre-stored gain compensation table; applying the loaded gain value to image data displayed on a display; and displaying the image data to which the gain value has been applied on a display.)

1. An image display method for a vehicle, the method comprising the steps of:

tracking the driver's gaze;

determining, by a controller, an angle formed between a display and a driver's line of sight;

loading, by the controller, a gain value corresponding to the determined angle from a pre-stored gain compensation table;

applying, by the controller, the loaded gain value to image data displayed on the display; and

displaying the image data to which the gain value has been applied on the display.

2. The image display method according to claim 1, wherein the step of tracking the line of sight of the driver includes: the position of at least one of the face and the pupil of the eye of the driver is detected from the captured image of the driver, and the line of sight of the driver is tracked.

3. An image display method according to claim 2, wherein the step of determining an angle formed between the display and a driver's line of sight comprises: an angle in at least one of a horizontal direction and a vertical direction between a driver's line of sight and a center point of the display is determined.

4. The image display method according to claim 3, wherein the step of loading the gain value corresponding to the determined angle from the pre-stored gain compensation table comprises: loading a gain value corresponding to at least one of an angle in the horizontal direction and an angle in the vertical direction between the display and a driver's line of sight.

5. The image display method according to claim 4, wherein the step of applying the loaded gain value to the image data displayed on the display includes: applying the gain value corresponding to an angle in the horizontal direction between the display and a driver's line of sight to only one row.

6. The image display method according to claim 4, wherein the step of applying the loaded gain value to the image data displayed on the display includes: the gain value corresponding to an angle in the vertical direction between the display and the driver's sight line is applied in units of each frame.

7. The image display method according to claim 4, wherein the step of applying the loaded gain value to the image data displayed on the display includes: changing the gain value in response to a driving frequency of the display and applying the gain value when at least one of an angle in the horizontal direction and an angle in the vertical direction between the display and a line of sight of a driver changes a reference angle or more within a predetermined time.

8. The image display method according to claim 4, wherein the step of applying the loaded gain value to the image data displayed on the display includes: applying a gain value responsive to a corresponding angle to the image data displayed on the display when a change in an angle between the display and a driver's sight line is equal to or greater than the reference angle.

9. The image display method of claim 8, wherein, upon determining that the change is not within the reference angle, the controller is configured to: determining whether a current position of a driver changes by the reference angle or more with respect to an initial position of the driver, and updating the current position and the initial position of the driver and applying a gain to the image data to correct the image data according to the change of the angle when it is determined that the current position changes by the reference angle or more with respect to the initial position.

10. A computer-readable recording medium storing a program for executing the image display method for the vehicle according to claim 1.

11. A vehicle, comprising:

a display for displaying image data;

a sight line tracking unit for tracking a sight line of a driver;

an angle calculation unit configured to determine an angle formed between the display and a driver's sight line;

a gain compensation table for storing gain values applied in response to an angle formed between the display and a driver's sight line;

a display controller including a processor and configured to load a gain value corresponding to the angle determined by the angle calculation unit from the stored gain values of the gain compensation table, apply the gain value to the image data, and display the image data to which the gain value is applied on the display.

12. The vehicle according to claim 11, further comprising: a camera for capturing an image of the driver,

wherein the sight line tracking unit is configured to detect a position of at least one of a face and a pupil of an eye of the driver from the captured image of the driver, and detect the sight line of the driver.

13. The vehicle according to claim 12, wherein the angle calculation unit is configured to determine an angle between a driver's line of sight and a center point of the display in at least one of a horizontal direction and a vertical direction.

14. The vehicle of claim 13, wherein the display controller is configured to load a gain value corresponding to at least one of an angle in the horizontal direction and an angle in the vertical direction between the display and a driver's line of sight.

15. The vehicle according to claim 14, wherein the display controller is configured to apply a gain value corresponding to an angle in the horizontal direction between the display and a line of sight of a driver to only one line of image data.

16. The vehicle according to claim 14, wherein the display controller is configured to apply a gain value corresponding to an angle in the vertical direction between the display and a driver's sight line to only one frame of image data.

17. The vehicle according to claim 14, wherein the display controller is configured to change the gain value in response to a driving frequency of the display when at least one of an angle in the horizontal direction and an angle in the vertical direction between the display and a line of sight of a driver changes a reference angle or more within a predetermined time, and is configured to apply the gain value.

18. The vehicle according to claim 14, wherein when the change in the angle between the display and the driver's sight line is equal to or greater than the reference angle, the display controller is configured to apply a gain value responsive to the respective angle to the image data displayed on the display.

19. The vehicle of claim 18, upon determining that the change is not within the reference angle, the controller is configured to: determining whether a current position of a driver changes by the reference angle or more with respect to an initial position of the driver, and updating the current position and the initial position of the driver and applying a gain to the image data to correct the image data according to the change of the angle when it is determined that the current position changes by the reference angle or more with respect to the initial position.

Technical Field

The present invention relates to a vehicle and an image display method for the vehicle for preventing display colors from being distorted according to a viewing angle of a driver.

Background

In order to support and improve the functions of the vehicle, various types of displays are provided in the vehicle. For example, a navigation system that is provided in a vehicle and provides route guidance to a destination is widely used.

A navigation system is a device that matches a route from a current position to a destination set by a driver with map information and provides the route. Navigation systems tend to be provided with high performance displays to provide various types of information to facilitate the driver and to display route information. Accordingly, Organic Light Emitting Diode (OLED) displays having higher response speed and higher brightness and contrast ratio are receiving more and more attention than conventional liquid crystal display devices.

In the case of an OLED display, a microcavity (microcavity) in which a cathode and an anode are formed of a metal material with a light emitting layer therebetween is often applied to improve optical efficiency. In the OLED display to which the microcavity structure is applied, when the viewing angle is shifted from the front to the side, the colors of the front and the side of the panel are different, which causes color shift and degrades R, G and the color reproducibility of B.

However, since the display of the navigation system provided in the vehicle is disposed at the side of the driver's sight line, when the OLED display is used as the display of the navigation system, it is difficult to avoid deterioration of the definition according to the viewing angle.

The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and is not to be taken as an acknowledgement or any form of suggestion that this information forms the prior art known to a person skilled in the art.

Disclosure of Invention

Various aspects of the present invention are directed to provide a vehicle and an image display method of the vehicle capable of preventing display colors from being distorted due to a viewing angle of a driver.

Various aspects of the present invention are directed to provide a vehicle and an image display method for the vehicle capable of preventing an undesirable color from being expressed according to a viewing angle of a driver when a navigation system employing an OLED is used.

Various aspects of the present invention are directed to provide a vehicle and an image display method for the vehicle, which can prevent color shift and luminance degradation based on a viewing angle and improve color reproducibility and external visibility when an OLED having a microcavity is applied due to a change in the viewing angle of a driver according to a driver's position.

It will be appreciated by those skilled in the art that the objects that can be achieved by the present invention are not limited to the above, and that the above and other objects of the present invention will be more clearly understood from the following detailed description.

To achieve these objects and other advantages and in accordance with the purpose of the invention, as embodied and broadly described herein, an image display method for a vehicle includes: tracking the driver's gaze; determining an angle formed between the display and a driver's line of sight; loading a gain value corresponding to the determined angle from a pre-stored gain compensation table; applying the loaded gain value to image data displayed on a display; and displaying the image data to which the gain value has been applied on a display.

In another aspect of the present invention, a vehicle includes: a display for displaying image data; a sight line tracking unit for tracking a sight line of a driver; an angle calculation unit configured to determine an angle formed between the display and a driver's sight line; a gain compensation table for storing gain values applied in response to an angle formed between the display and a driver's sight line; a display controller configured to load a gain value corresponding to the angle determined by the angle calculation unit from the gain values of the stored gain compensation table, apply the gain value to the image data, and display the image data to which the gain value is applied on the display.

The vehicle and the image display method for the vehicle according to at least various exemplary embodiments of the present invention configured as above may prevent the display color from being distorted due to a viewing angle problem by compensating the display color in real time in response to the viewing angle of the driver.

In addition, when a navigation system employing an OLED display is used, the present invention can prevent an undesirable color from being expressed according to a viewing angle of a driver.

In addition, when the OLED having the microcavity is applied, the present invention can prevent color shift and luminance degradation based on a viewing angle and improve color reproducibility and external visibility when the viewing angle of a driver varies according to a driver's position.

The method and apparatus of the present invention have other features and advantages which will be apparent from or are set forth in more detail in the accompanying drawings, which are incorporated herein, and the following detailed description, which together serve to explain certain principles of the invention.

Drawings

Fig. 1 is a schematic diagram showing an example of a vehicle according to various exemplary embodiments of the present invention.

FIG. 2 is a block diagram of a vehicle according to various exemplary embodiments of the present invention.

Fig. 3 is the CIE1931 coordinate system.

Fig. 4 is a flowchart for describing an image display method according to various exemplary embodiments of the present invention.

Fig. 5 is a diagram for describing a method of compensating image data by an image display method according to various exemplary embodiments of the present invention.

Fig. 6 is a diagram for describing a method of compensating image data by an image display method according to various exemplary embodiments of the present invention.

Fig. 7 is a diagram for describing a method of compensating image data by an image display method according to various exemplary embodiments of the present invention.

Fig. 8 is a diagram for describing a method of compensating image data by an image display method according to various exemplary embodiments of the present invention.

It should be understood that the drawings are not necessarily to scale, presenting a simplified representation of various features illustrative of the basic principles of the invention. The specific design features of the invention, including, for example, specific dimensions, orientations, locations, and shapes, as disclosed herein, will be determined in part by the particular intended application and use environment.

In the drawings, like or equivalent elements of the present invention are designated by reference numerals throughout the several views of the drawings.

Detailed Description

Reference will now be made in detail to various embodiments of the present invention, examples of which are illustrated in the accompanying drawings and described below. While the invention will be described in conjunction with the exemplary embodiments of the invention, it will be understood that they are not intended to limit the invention to these exemplary embodiments. On the contrary, the invention is intended to cover not only these exemplary embodiments of the invention, but also various alternatives, modifications, equivalents and other embodiments, which may be included within the spirit and scope of the invention as defined by the appended claims.

A detailed description of exemplary embodiments of the invention will be provided to enable those skilled in the art to make and practice the invention, with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and is not limited to the exemplary embodiments described herein. In addition, for the purpose of clear description in the drawings, parts irrelevant to the description will be omitted, and the same reference numerals are used to designate the same or similar parts throughout the specification.

Throughout the specification, when a portion is said to "include" a particular element, it means that the portion may also include other elements, and does not exclude the same element, unless otherwise specified. In addition, the terms "-device", "module", "portion" or "means" are used to denote a unit for performing at least one function or operation, and the unit may be implemented as hardware, software, or a combination thereof.

Throughout the specification, when a component is said to "include" a specific element, it means that the component does not exclude other elements but further includes other elements, and thus, unless otherwise specified, may include the corresponding element. In addition, throughout the specification, the same or similar elements are denoted by the same reference numerals.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the following description, if a detailed description of a known technology related to the present description may unnecessarily obscure the gist of the present description, a detailed description thereof is omitted. The component names used in the specification are selected in consideration of ease of description, and may possibly be different from those of actual products.

Fig. 1 is a schematic diagram showing an example of a vehicle according to various exemplary embodiments of the present invention.

As shown in fig. 1, a display 200 that displays a navigation screen S may be provided in the vehicle. The display 200 for navigation may be disposed between the driver seat and the passenger seat.

The display 200 may employ an OLED display. The OLED has a structure in which an organic light emitting layer is formed between a cathode for injecting electrons and an anode for injecting holes. The microcavity structure can be applied to an OLED display to improve light efficiency. The microcavity has a structure in which a cathode is formed of a metal material to serve as a reflective electrode, an anode is formed in a layer structure of an Indium Tin Oxide (ITO) layer and an Ag layer, and an optical cavity is formed between the cathode and the anode.

In the OLED display employing the microcavity structure, when a viewing angle is shifted from the front to the side of the display panel, an Optical Path Difference (OPD) between enhanced lights (enhanced light) is reduced, and an enhanced wavelength range is shifted in a short wavelength direction. Therefore, the front and side surfaces of the panel are different in color, and thus may cause color shift. The present invention is directed to solving such a color shift problem, and proposes a method of compensating RGB image data by applying a gain in real time based on the position of a driver.

Fig. 2 is a block diagram showing an example of the configuration of a vehicle according to various exemplary embodiments of the present invention, focusing on components related to the exemplary embodiments of the present invention.

Referring to fig. 2, a vehicle according to various exemplary embodiments of the present invention includes: a display 200 to display image data, a camera 100 to capture an image of the driver, a sight line tracking unit 320, a gain compensation table 330, and a display controller 310 to control these components.

The display 200 may display navigation information and various types of information convenient to the driver. The display 200 of the exemplary embodiment may be an OLED display to which a microcavity structure is applied.

The camera 100 captures an image of the face of the driver sitting in the driver seat and supplies the image to the sight line tracking unit 320.

The sight line tracking unit 320 tracks the movement of the face of the driver and the movement of the eye pupils from the face image of the driver. The sight line tracking unit 320 may determine the position of the driver's sight line in real time by performing sight line tracking (i.e., eye tracking). The gaze tracking unit 320 may detect the movement of the eye pupils by analyzing the images captured by the camera 100 and determine the gaze of the driver from the detected movement. Although the method of tracking the line of sight by video analysis using a camera has been described in various exemplary embodiments of the present invention, an eye tracking technology such as a contact lens method and a sensor attachment method may also be applied.

The gain compensation table 330 stores gain values based on an angle formed between the display 200 and the driver's sight line. The gain compensation table 330 stores gain values for correcting color shifts of the display 200 for respective viewing angles. For example, in the case where the resolution is 1920 × 720, each pixel may store a gain of 1920 × (0 ° to 90 °) × (a viewing angle of 3(R, G, B) × 1 °). The gain compensation requires controlling the gain of RGB data to achieve a desired color, and a correction value can be set with reference to the CIE1931 coordinate system, which is a commonly used color coordinate system. Fig. 3 shows the CIE1931 coordinate system. Referring to fig. 3, if red coordinates (0.34,0.32) are measured when data (128,128,128) is input, color variation may be corrected to (128,140,140) and white (0.31.32) by adding 10% gain to green (G) and blue (B). The gain compensation table 330 may be stored in a timing controller or an H/U memory included in the display 200. In addition, in the gain compensation table 330, the angle formed between the display 200 and the driver may include an angle in the horizontal direction and an angle in the vertical direction. Accordingly, a gain value according to an angle in the horizontal direction, a gain value according to an angle in the vertical direction, and a gain value according to a combination of angles in the horizontal direction and the vertical direction may be stored in the gain compensation table 330. For example, in the case of the level compensation, 90 gain values may be stored in units of 1 ° based on the driver in the range of 0 ° to 90 °. When vertical compensation is required, 180 gain values may be stored in units of 1 ° in the range of-90 ° to 90 ° in the vertical direction. Accordingly, color compensation of an angle of 0 ° to 90 ° in the horizontal direction and an angle of-90 ° to 90 ° in the vertical direction can be performed according to a combination of 90 gain values in the horizontal direction and 180 gain values in the vertical direction. Here, in order to minimize the data of the gain compensation table 330, the effective angle between the driver and the display may be limited to a range of 10 ° to 70 ° in the horizontal direction and a range of-60 ° to 20 ° in the vertical direction. The size of the gain compensation table 330 may be reduced to 1 × 2 or 1 × 4 in consideration of memory efficiency, and when the gain is applied in units of each frame, a gain of 2 × 2 or 4 × 4 may be applied.

The display controller 310 determines an angle formed between the display 200 and the driver's sight line based on the tracking result of the sight line tracking unit 320, loads a gain value corresponding to the determined angle from the gain compensation table 330, applies the gain value to the image data, and displays the image data to which the gain value is applied on the display 200. The display controller 310 performing this control function may include: an image signal output unit 312, a gain application unit 314, and an angle calculation unit 316.

The angle calculation unit 316 may determine angles in the horizontal direction and the vertical direction between the user's sight line and the center point of the display 200 based on the tracking result of the sight line tracking unit 320.

The gain applying unit 314 may load a gain value corresponding to the angle determined by the angle calculating unit 316 from the gain compensation table 330 and apply the loaded gain value to the image data. A flash memory may be used for the gain compensation table 330, and an SRAM may be used for the gain application unit 314. The gain application unit 314 may perform only horizontal compensation or vertical and horizontal compensation according to the aspect ratio of the display 200. For example, for displays with aspect ratios of 24:9 and 32:9, the vertical length is short, so the effect of color change in the vertical direction is insignificant. Therefore, only horizontal compensation can be performed on such a display. The gain applying unit 314 may apply a gain value corresponding to a horizontal angle between the display 200 and the driver's sight line to only one line, and apply a gain value corresponding to a vertical angle in units of frames. Here, when the gain applying unit 314 applies a gain in units of 2 ° instead of 1 °, and performs linear interpolation, the size of the gain compensation table 330 may be minimized to save memory. Meanwhile, when the position of the driver is rapidly changed, the color compensation value is increased, and thus a sense of difference can be perceived. Accordingly, the gain applying unit 314 can sequentially control the gain values by the driving frequency step of 1 second, thereby minimizing the feeling of disparity. In addition, when compensation is applied even when the position of the driver slightly changes, frequent compensation may cause a feeling of difference. Accordingly, a fine motion (e.g., a motion of about +/-5 °) may be set as a reference value based on the current angle, and compensation may be performed only for a motion equal to or greater than the reference value. In addition, continuous fine motion may be detected, and when a +/-5 ° change from the initial position occurs, the current position may be updated, and then the gain value may be applied such that the sense of difference due to frequent compensation is minimized.

The image signal output unit 312 may output the image data to which the gain value is applied at the gain application unit 314 to the display 200.

According to this configuration, the vehicle according to an exemplary embodiment of the present invention may apply a gain to compensate for the color of the image data according to the position of the driver in real time and then display the compensated image data on the display 200. Accordingly, it is possible to solve the problem that an undesired color is expressed due to the angle difference between the display 200 and the driver's sight line.

Fig. 4 is a flowchart for describing an image display method according to various exemplary embodiments of the present invention.

Referring to fig. 4, the sight line tracking unit 320 tracks the sight line of the driver in real time and outputs a tracking result (S110). The sight line tracking unit 320 may track the change of the driver's sight line in real time using a method such as image analysis, a contact lens method, or a sensor attachment method.

The angle calculation unit 316 of the display controller 310 determines an angle formed between the driver' S sight line and the display 200 based on the tracking result of the sight line tracking unit 320 (S120). The angle calculation unit 316 may determine an angle in a horizontal direction or a vertical direction between the driver's sight line and the center point of the display 200.

The gain application unit 314 of the display controller 310 loads a gain value corresponding to the angle determined in the angle calculation unit 316 from the gain compensation table 330 (S130).

The display controller 310 may apply the loaded gain to the image data and display the color-compensated image data on the display 200 (S140).

Fig. 5 is a diagram for describing a method of compensating image data by an image display method according to various exemplary embodiments of the present invention, and illustrates a case of compensating colors in a horizontal direction.

When the display 200 has an aspect ratio of 24:9 or 32:9, the vertical length is short, and thus the color change in the vertical direction is not significant. Thus, only horizontal compensation may be performed on the display. In the case of horizontal compensation, 90 gain values may be stored in the gain compensation table 330 in units of 1 ° from 0 ° to 90 °.

The line of sight of the driver is tracked using the camera 100, and then the angle in the horizontal direction between the line of sight of the driver and the display 200 can be determined.

Comparing the case where the angle in the horizontal direction is 30 ° with the case where the angle in the horizontal direction is 45 °, the driver is farther from the center of the display 200 in the case where the angle is 30 ° than in the case of 45 °. That is, when the angle in the horizontal direction is 30 °, color shift may become serious. Therefore, in the case of 30 °, the gain value of the gain compensation table 330 may be set to be larger. In performing color shift compensation on the angle in the horizontal direction, the gain applying unit 314 may apply a gain value corresponding to the angle in the horizontal direction between the display 200 and the driver's sight line to only one line.

Fig. 6 is a diagram for describing a method of compensating image data by an image display method according to various exemplary embodiments of the present invention, and illustrates a case of compensating colors in a vertical direction.

The line of sight of the driver is tracked using the camera 100, and then the angle in the vertical direction between the line of sight of the driver and the display 200 can be determined. Fig. 6 shows the case where the angle of the driver's head position is changed to 0 °, 15 °, and 30 ° in the vertical direction with the angle between the driver's sight line and the display 200 fixed at 45 °.

When horizontal and vertical compensation is required, 180 gain values may be set in the gain compensation table 330 in the vertical direction in units of 1 ° from-90 ° to 90 °. Accordingly, color compensation of 0 ° to 90 ° in the horizontal direction and-90 ° to 90 ° in the vertical direction can be performed according to a combination of 90 gain values in the horizontal direction and 180 gain values in the vertical direction. The gain compensation table 330 of fig. 6 shows a gain table applied when the angle between the line of sight of the driver and the display is 45 ° to the left and the height angle in the vertical direction is 0 ° in a display whose resolution is 1920 × 1920. When vertical and horizontal compensation is performed in this manner, a gain may be applied in units of each frame to perform color compensation.

Fig. 7 is a diagram for describing a method of compensating image data by an image display method according to various exemplary embodiments of the present invention, and illustrates a method of preventing a sense of incongruity from being generated due to abrupt color compensation when the position of a driver is rapidly changed.

When at least one of the angle in the horizontal direction and the angle in the vertical direction between the display and the line of sight of the driver changes by or more than the reference angle within a predetermined time, that is, when the position of the driver changes rapidly, the gain value may increase rapidly. The rapid increase in the gain value causes the color compensation value to rapidly change, so that the driver may perceive the rapid color change of the image data. In this way, when the display color changes rapidly due to a rapid change in the driver's position, the driver may perceive a sense of difference.

Accordingly, in various exemplary embodiments of the present invention, as shown in fig. 7, image data may be corrected by sequentially controlling gain values by a driving frequency step of 1 second. That is, when the compensation value is rapidly changed, the image data may be compensated by sequentially changing the gain value 1 second per frame, instead of reflecting the rapidly changed compensation value in real time in the image data.

Fig. 8 is a diagram for describing a method of compensating image data by an image display method according to various exemplary embodiments of the present invention, and illustrates a method of preventing a sense of incongruity from being generated due to frequent compensation even when the compensation is applied even when the driver has a slight motion.

The display controller 310 may check the current position of the driver (S210) and determine whether the position of the driver is changed (S220). Since the sight-line tracking unit 320 tracks the driver's sight line in real time and outputs the tracking result, the display controller 310 may check the current position and the changed position of the driver based on the tracking result of the sight-line tracking unit 320.

The display controller 310 determines whether the variation of the driver' S sight line, i.e., the variation of the angle between the display 200 and the driver is +/-5 deg. (S230). Here, +/-5 ° is a reference value for determining whether the driver's motion is reflected in the compensation, and the reference value may be changed in various ways according to the system design method.

Upon determining that the driver' S sight line has changed +/-5 °, a gain is applied to the image data to correct the image data (S240).

Upon determining that the variation is not +/-5 deg., it is determined whether the current position is changed +/-5 deg. or more from the initial position (S260).

When the current position is changed by +/-5 ° or more from the initial position, both the current position and the initial position are updated (S270), and a gain is applied to the image data according to the angle change to correct the image data (S240).

When the current position changes by less than +/-5 deg. from the initial position, no compensation is performed and the current position of the driver is updated (S250). Therefore, when the fine motions of the driver are accumulated and when the position of the driver is changed by +/-5 ° from the initial position, a gain may be applied to the image data to correct the image data.

As described above, the present invention can prevent the display color from being distorted due to the viewing angle problem by compensating the display color in real time in response to the viewing angle of the driver.

In addition, when a navigation system employing an OLED display is used, the present invention can prevent an undesirable color from being expressed according to a viewing angle of a driver, and particularly, when an OLED having a microcavity is used, can prevent color shift and luminance degradation based on the viewing angle, and improve color reproducibility and external visibility.

In addition, terms related to control devices (e.g., "controller," "control unit," "control device," or "control module," etc.) refer to hardware devices, including memory and processors configured to perform one or more steps interpreted as an algorithmic structure. The memory stores algorithm steps, and the processor executes the algorithm steps to perform one or more processes of the method according to various exemplary embodiments of the present invention. The controller according to an exemplary embodiment of the present invention may be implemented by a nonvolatile memory configured to store an algorithm for controlling operations of various components of a vehicle or data on software commands for executing the algorithm, and a processor configured to perform the operations described above using the data stored in the memory. The memory and the processor may be separate chips. Alternatively, the memory and the processor may be integrated in a single chip. A processor may be implemented as one processor or as multiple processors.

The control means may be at least one microprocessor operated by a predetermined program which may include a series of commands for performing the methods included in various exemplary embodiments of the present invention.

The present invention described above can be implemented as computer readable codes in a medium in which a program is recorded. The computer readable medium includes all types of recording devices that store data readable by a computer system. Examples of the computer readable recording medium include Hard Disk Drives (HDDs), Solid State Drives (SSDs), Silicon Disk Drives (SDDs), ROMs, RAMs, CD-ROMs, magnetic tapes, floppy disks, optical data storage devices, and the like.

In various exemplary embodiments of the present invention, the above-described operations may be performed by a controller, and the controller may be configured as a plurality of controllers or an integrated single controller.

For convenience in explanation and accurate definition in the appended claims, the terms "upper", "lower", "inner", "outer", "upper", "lower", "upward", "downward", "front", "rear", "inner", "outer", "inward", "outward", "inner", "outer", "forward" and "rearward", and the like, are used to describe features of the exemplary embodiments with reference to the positions of such features as displayed in the figures. It is also to be understood that the term "coupled" or its derivatives refer to both direct and indirect connections.

In addition, the term "fixedly connected" means that the fixedly connected members always rotate at the same speed. In addition, the term "selectively connectable" means "selectively connectable members are rotated when the selectively connectable members are not engaged with each other, respectively; the selectively connectable members rotate at the same speed when the selectively connectable members are engaged with each other; the selectively connectable members are stationary when at least one of the selectively connectable members is a stationary member and the remaining selectively connectable members are engaged with the stationary member. "

The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to be exhaustive or to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable others skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications thereof. It is intended that the scope of the invention be defined by the following claims and their equivalents.