Method and apparatus for LED control to improve visibility of LCD displays

Abstract

A method and apparatus for LED control to improve visibility of an LCD display. An aspect of the disclosure provides a method for controlling a backlight unit including one or more LEDs to optimize visibility of an LCD display, the method including obtaining illumination information, sunrise information, and sunset information; determining one or more regions of the backlight unit divided into a plurality of regions having a predetermined size as a driving region based on the illumination information, the sunrise information, and the sunset information; and controlling the backlight unit based on the driving region.

Description

Technical Field

[0001] This disclosure relates to methods and apparatus for controlling LEDs to optimize the visibility of an LCD display. Background Technology

[0002] The statements in this section are provided merely as background information in connection with this disclosure and do not necessarily constitute prior art.

[0003] Local dimming technology is used as a control method for direct-type BLU (backlight unit) LCDs (liquid crystal displays). Local dimming divides the backlight unit (BLU), which includes an LED array, into multiple zones and controls each zone to be individually turned on or off. This technology has the advantage of improving energy efficiency and achieving a certain level of contrast by adjusting the brightness of specific areas. However, because it controls on a zone-by-zone rather than pixel-by-pixel basis, it has limitations in terms of display visibility.

[0004] For example, when displaying an image of a certain size on a monitor, if only the area containing the image is illuminated while the rest remains dark, the overall brightness may be reduced, leading to decreased visibility. To address this issue, increasing the current flowing through the backlight unit (BLU) to improve the overall display brightness may cause a halo effect, resulting in unwanted areas around the image becoming brighter, which could degrade image quality.

[0005] Therefore, in the local dimming technology of direct BLU type LCD displays, there is a need for methods and apparatus for optimizing visibility while maintaining image quality. Summary of the Invention

[0006] The purpose of this disclosure is to provide a method and apparatus for controlling LEDs to improve the visibility of an LCD display in various lighting environments. Specifically, this disclosure provides a method and apparatus for controlling LEDs, which optimizes the visibility of an LCD display according to the environment by determining a driving area based on illuminance information, sunrise information, and sunset information, and controlling a backlight unit based on the driving area.

[0007] The technical objectives of this disclosure are not limited to those described above, and those skilled in the art can clearly understand other technical objectives not mentioned above through the following description.

[0008] One embodiment of this disclosure provides a method for controlling a backlight unit including one or more LEDs to optimize the visibility of an LCD display. The method includes: obtaining illuminance information, sunrise information, and sunset information; determining one or more regions of the backlight unit, which are divided into a plurality of regions of predetermined size, as driving regions based on the illuminance information, sunrise information, and sunset information; and controlling the backlight unit based on the driving regions.

[0009] Another embodiment of this disclosure provides an apparatus for controlling a backlight unit including one or more LEDs to optimize the visibility of an LCD display. The apparatus includes: at least one memory storing commands; and at least one processor, wherein the at least one processor executes the commands to perform the following steps: obtaining illuminance information, sunrise information, and sunset information; determining one or more regions of the backlight unit divided into a plurality of regions having predetermined sizes as driving regions based on the illuminance information, sunrise information, and sunset information; and controlling the backlight unit based on the driving regions.

[0010] According to embodiments of this disclosure, an appropriate mode among the first to fourth modes can be determined based on illuminance information, sunrise information, and sunset information, and the backlight unit can be controlled based on the driving area set according to the determined mode, thereby optimizing visibility.

[0011] According to this disclosure, an appropriate mode among the first to fourth modes can be determined based on illuminance information, sunrise information, and sunset information, and the backlight unit can be controlled based on the driving area set according to the determined mode, thereby minimizing the halo effect.

[0012] According to this disclosure, visibility can be optimized by adjusting the driving area based on the expected brightness.

[0013] The technical effects of this disclosure are not limited to those described above. Those skilled in the art to which this disclosure pertains can understand other technical effects not mentioned herein through the following description. Attached Figure Description

[0014] Figure 1 This is a block diagram illustrating, exemplarily, the configuration of an LED control device and its peripheral devices for optimizing the visibility of an LCD display according to embodiments of the present disclosure.

[0015] Figure 2A This is a schematic diagram illustrating a backlight unit of a first mode according to an embodiment of the present disclosure.

[0016] Figure 2B This is a schematic diagram illustrating a backlight unit in a second mode according to an embodiment of the present disclosure.

[0017] Figure 2C This is a schematic diagram illustrating a backlight unit in a third mode according to an embodiment of the present disclosure.

[0018] Figure 2D This is a schematic diagram illustrating a backlight unit in a fourth mode according to an embodiment of the present disclosure.

[0019] Figure 3AThis is a schematic diagram illustrating a method for calculating the expected brightness of a region containing a target image in a second mode according to an embodiment of the present disclosure.

[0020] Figure 3B This is a schematic diagram illustrating a method for calculating the expected brightness of a region containing a target image in a third mode according to embodiments of the present disclosure.

[0021] Figure 4 This is a flowchart illustrating an LED control method for optimizing the visibility of an LCD display according to an embodiment of the present disclosure.

[0022] Figure 5 This is a block diagram illustrating an exemplary computing device that can be used to implement the methods or apparatus according to this disclosure. Detailed Implementation

[0023] In the following description, some exemplary embodiments of the present disclosure are described in detail with reference to the accompanying drawings. In the following specification, similar reference numerals preferably denote similar elements, even if these elements are shown in different drawings. Furthermore, in the following description of some embodiments, detailed descriptions of known functions and structures incorporated therein are omitted for clarity and brevity.

[0024] Furthermore, terms such as first, second, A, B, (a), (b), etc., are used only to distinguish one component from another and do not imply or suggest the composition, order, or sequence of components. Throughout the specification, when a component “comprises” or “includes” a component, that component is intended to further include other components, not exclude them, unless specifically stated to the contrary. The terms “unit,” “module,” etc., refer to one or more units for performing at least one function or operation and can be implemented by hardware, software, or a combination thereof.

[0025] The following detailed description and accompanying drawings are intended to illustrate exemplary embodiments of the present disclosure and are not intended to represent only the possible embodiments in which the invention can be practiced.

[0026] Figure 1 This is a block diagram illustrating, exemplarily, the configuration of an LED control device and its peripheral devices for optimizing the visibility of an LCD display according to embodiments of the present disclosure.

[0027] Reference Figure 1 The image shows an LED control device 10, an illuminance sensor 100, and an LCD panel 110.

[0028] The illuminance sensor 100 can detect the illuminance, or brightness, of the external environment of the vehicle. The illuminance sensor 100 can convert the detected illuminance into a digital signal. The illuminance sensor 100 can send the converted digital signal to the host unit 102.

[0029] The LED control device 10 may include a host unit 102, a timing controller 104, an LED control block 106, and an LED driver 108. The LED control device 10 may be implemented using one or more computing devices 50. The LED control device 10 may include at least one memory 500 and at least one processor 520.

[0030] The host unit 102 can receive illuminance data converted into digital signals by the illuminance sensor 100. In other words, the host unit 102 can acquire illuminance information. The host unit 102 can also obtain sunrise and sunset information. This information can be generated by the host unit 102 itself or obtained from an external source. As an example, the host unit 102 can calculate sunrise and sunset times based on the vehicle's location, date, and time information. The vehicle's location can be obtained using a Global Positioning System (GPS). As another example, the host unit 102 can obtain sunrise and sunset times from a server. The host unit 102 can then send the illuminance, sunrise, and sunset information to the timing controller 104.

[0031] Host unit 102 can acquire video data. The video data can be a source including at least one piece of information to be displayed on LCD panel 110, such as a navigation map, rearview camera image, entertainment content, and dashboard information. Host unit 102 can be coupled to a server. Host unit 102 can send the video data to timing controller 104.

[0032] The timing controller 104 can receive illuminance information, sunrise information, and sunset information from the host unit 102. The timing controller 104 may include an LED control block 106. The LED control block 106 can determine a driving area based on the illuminance information, sunrise information, and sunset information. The driving area can be determined based on any one of a first mode, a second mode, a third mode, and a fourth mode. The LED control block 106 can select one of the first mode, the second mode, the third mode, and the fourth mode based on the vehicle's external environmental conditions (e.g., illuminance information, sunrise information, sunset information). Reference will be made below. Figures 2A to 2D The methods for determining the first to fourth modes and the shapes of the driving regions determined based on the first to fourth modes are described in detail. The LED control block 106 can calculate the expected brightness of the region containing the target image based on the determined driving regions. The following will refer to... Figure 3A and Figure 3B A method for calculating the expected brightness is described in detail. Optionally, the LED control block 106 can adjust the driving area based on the expected brightness. The timing controller 104 can send the position and brightness information of the driving area determined by the LED control block 106 to the LED driver 108.

[0033] The timing controller 104 can calculate the gate timing required to drive the pixels of the LCD panel 110. The timing controller 104 can send gate timing signals to the LCD panel 110.

[0034] The timing controller 104 can receive video data from the host unit 102. The timing controller 104 can send the video data to the LCD panel 110. The timing controller 104 can send video data in conjunction with the gate timing signals.

[0035] The LED driver 108 can receive position and brightness information of the driving area from the timing controller 104. Based on the position and brightness information of the driving area, the LED driver 108 can control the backlight unit of the LCD panel 110.

[0036] LCD panel 110 may include a backlight unit, a polarizing filter, a glass substrate, a color filter, and a TFT array. LCD panel 110 can use light generated by the backlight unit to display images. The backlight unit may include multiple LEDs. The backlight unit can be divided into multiple regions, each region having a predetermined size.

[0037] LCD panel 110 can receive gate timing signals from timing controller 104. LCD panel 110 can also receive video data from timing controller 104. LCD panel 110 can display the video data. LCD panel 110 can adjust the brightness and color of pixels based on gate timing signals and control of LED driver 108 to achieve a desired image. For example, LCD panel 110 can apply voltage to each pixel at precise times based on gate timing signals. For example, LCD panel 110 can set the driving area to a given brightness by controlling LED driver 108.

[0038] Figure 2A A schematic diagram of a backlight unit in a first mode according to an embodiment of the present disclosure is shown.

[0039] Reference Figure 2A The diagram shows a backlight unit 200. The backlight unit 200 can be divided into multiple regions 211, 212, 213, 214, 215, 221, 222, 223, 224, 225, 231, 232, 233, 234, 235, 241, 242, 243, 244, 245, 251, 252, 253, 254 and 255, each region having a predetermined size.

[0040] The first mode can be a mode that sets the region 233 containing the target image as the driving region. The LED control block 106 can select the first mode when it is after sunset and before sunrise. The time between sunset and sunrise can refer to nighttime.

[0041] When the sun is between sunrise and sunset, and the illuminance is less than a first threshold based on illuminance information, the LED control block 106 can select a first mode. Illuminance less than the first threshold could mean the vehicle is in a tunnel or underground parking lot. The first threshold could be 400 lx. For example, when the sun is between sunrise and sunset, and the illuminance is less than 400 lx, the LED control block 106 can select the first mode.

[0042] Figure 2B A schematic diagram of a backlight unit in a second mode according to an embodiment of the present disclosure is shown.

[0043] Reference Figure 2B The diagram shows a backlight unit 200. The backlight unit 200 can be divided into multiple regions 211, 212, 213, 214, 215, 221, 222, 223, 224, 225, 231, 232, 233, 234, 235, 241, 242, 243, 244, 245, 251, 252, 253, 254 and 255, each region having a predetermined size.

[0044] The second mode can be a mode in which the region 233 containing the target image and four adjacent regions 223, 232, 234, and 243 on the top, bottom, left, and right sides of the region containing the target image are set as driving regions. When it is after sunrise and before sunset, and the illuminance is greater than or equal to a first threshold and less than a second threshold based on illuminance information, the LED control block 106 can select the second mode. The situation where the illuminance is greater than or equal to the first threshold and less than the second threshold can represent a rainy day, morning, or evening. The first threshold can be 400 lx. The second threshold can be 3000 lx. For example, when it is after sunrise and before sunset, and the illuminance is greater than or equal to 400 lx and less than 3000 lx, the LED control block 106 can select the second mode.

[0045] Figure 2C This is a schematic diagram of a backlight unit in a third mode according to an embodiment of the present disclosure.

[0046] Reference Figure 2C The diagram shows a backlight unit 200. The backlight unit 200 can be divided into multiple regions 211, 212, 213, 214, 215, 221, 222, 223, 224, 225, 231, 232, 233, 234, 235, 241, 242, 243, 244, 245, 251, 252, 253, 254 and 255, each region having a predetermined size.

[0047] The third mode can be a mode in which the region 233 containing the target image, four regions 223, 232, 234, and 243 adjacent to the region containing the target image on its top, bottom, left, and right sides, and four regions 222, 224, 242, and 244 adjacent to the region containing the target image diagonally are set as driving regions. When it is after sunrise and before sunset, and the illuminance is greater than or equal to a second threshold and less than a third threshold based on illuminance information, the LED control block 106 can select the third mode. Illuminance greater than or equal to the second threshold and less than the third threshold can indicate a sunny day. The second threshold can be 3000 lx. The third threshold can be 10,000 lx. For example, when it is after sunrise and before sunset, and the illuminance is greater than or equal to 3000 lx and less than 10,000 lx, the LED control block 106 can select the third mode.

[0048] Figure 2D This is a schematic diagram of a backlight unit in a fourth mode according to an embodiment of the present disclosure.

[0049] Reference Figure 2D The diagram shows a backlight unit 200. The backlight unit 200 can be divided into multiple regions 211, 212, 213, 214, 215, 221, 222, 223, 224, 225, 231, 232, 233, 234, 235, 241, 242, 243, 244, 245, 251, 252, 253, 254 and 255, each region having a predetermined size.

[0050] The fourth mode can be a mode in which multiple regions 211, 212, 213, 214, 215, 221, 222, 223, 224, 225, 231, 232, 233, 234, 235, 241, 242, 243, 244, 245, 251, 252, 253, 254, and 255 are all set as driving regions. When it is after sunrise and before sunset, and the illuminance is greater than or equal to a third threshold based on illuminance information, the LED control block 106 can select the fourth mode. An illuminance greater than or equal to the third threshold could mean that the display (i.e., LCD panel 110) is directly facing the sun, for example, when a skylight is open. The third threshold can be 10,000 lx. For example, when it is after sunrise and before sunset, and the illuminance is greater than or equal to 10,000 lx, the LED control block 106 can select the fourth mode.

[0051] According to this disclosure, an appropriate mode among the first to fourth modes can be determined based on illuminance information, sunrise information, and sunset information, and the backlight unit can be controlled based on the driving area set according to the determined mode, thereby optimizing visibility.

[0052] According to this disclosure, an appropriate mode among the first to fourth modes can be determined based on illuminance information, sunrise information, and sunset information, and the backlight unit can be controlled based on the driving area set according to the determined mode, thereby minimizing the halo effect.

[0053] Figure 3A This is a schematic diagram illustrating a method for calculating the expected brightness of a region containing a target image in a second mode according to embodiments of the present disclosure.

[0054] Reference Figure 3A The diagram illustrates the driving region 300a of the second mode. The driving region 300a may include a region A containing the target image and four regions B adjacent to the region containing the target image on its upper, lower, left, and right sides. Each of the four adjacent regions B may be referred to as an adjacent region B hereinafter.

[0055] The LED control block 106 can calculate the expected brightness of region A containing the target image based on Formula 1.

[0056] [Formula 1]

[0057] A′=A+B*weight*n

[0058] Referring to Formula 1, A' is the expected brightness, A is the basic brightness of the region A containing the target image when there is no adjacent region B, B is the basic brightness of the adjacent region B, weight is the weight indicating the influence of the brightness of the adjacent region on the region containing the target image, and n is the number of adjacent regions.

[0059] For example, in Formula 1, if A is 500 nits, B is 500 nits, weight is 0.2, and n is 4, then... Figure 3A As shown, the expected brightness A' can be calculated as 900 nits. The weighting value can vary based on the design of the backlight unit.

[0060] Figure 3B This is a schematic diagram illustrating a method for calculating the expected brightness of a region containing a target image in a third mode according to embodiments of the present disclosure.

[0061] Reference Figure 3B The diagram illustrates the driving region 300b of the third mode. The driving region 300b may include a region A containing the target image and eight regions B adjacent to the region containing the target image in the vertical, horizontal, and diagonal directions. Each of the eight adjacent regions B may be referred to as an adjacent region B hereinafter.

[0062] The LED control block 106 can calculate the expected brightness of region A containing the target image based on Formula 1.

[0063] For example, in Formula 1, if A is 500 nits, B is 500 nits, the weight is 0.2, and n is 8, then... Figure 3B As shown, the expected illuminance A' can be calculated as 1300 nits. The weighting value can vary based on the design of the backlight unit.

[0064] Optionally, the LED control block 106 can adjust the driving region based on the expected brightness. The LED control block 106 can obtain the difference between the expected brightness and the target brightness, and based on this difference, exclude one or more regions in adjacent regions B from the driving region. That is, based on this difference, voltage can be withheld from one or more regions in adjacent regions B. For example, since the LED control block 106 needs to reduce the expected brightness A' by 100 nits when the target brightness is 1200 nits, one of the eight regions B can be excluded from the driving region.

[0065] According to this disclosure, visibility can be optimized by adjusting the driving area based on the expected brightness.

[0066] Figure 4 This is a flowchart illustrating an LED control method for optimizing the visibility of an LCD display according to an embodiment of the present disclosure.

[0067] Reference Figure 4 The LED control device 10 can obtain illuminance information, sunrise information and sunset information (S410).

[0068] The LED control device 10 can determine one or more regions among the backlight units divided into multiple regions of predetermined size as driving regions based on illuminance information, sunrise information, and sunset information (S420). The driving regions can be determined based on any one of the first mode, second mode, third mode, and fourth mode.

[0069] The LED control device 10 can control the backlight unit based on the driving area (S430).

[0070] Figure 5 This is a block diagram illustrating an exemplary computing device that can be used to implement the methods or apparatus according to this disclosure.

[0071] Computing device 50 may include all or part of memory 500, processor 520, storage device 540, input / output interface 560, and communication interface 580. Computing device 50 may be a fixed computing device, such as a desktop computer or server, or a mobile computing device, such as a laptop or smartphone. Computing device 50 may include dedicated hardware accelerators capable of efficiently processing artificial intelligence model operations. For example, computing device 50 may include a graphics processing unit (GPU), a tensor processing unit (TPU), or a neural processing unit (NPU).

[0072] Memory 500 may store programs that enable processor 520 to perform methods or operations according to embodiments of the present disclosure. For example, the program may include multiple instructions executable by processor 520, and the methods or operations described above may be performed by processor 520 executing the multiple instructions. Memory 500 may consist of a single memory or multiple memories. In this case, information required to perform the methods or operations according to embodiments of the present disclosure may be stored in a single memory or distributed across multiple memories. When memory 500 consists of multiple memories, these multiple memories may be physically separated. Memory 500 may include at least one of volatile memory and non-volatile memory. Volatile memory includes static random access memory (SRAM) or dynamic random access memory (DRAM), and non-volatile memory includes flash memory.

[0073] Processor 520 may include at least one core capable of executing at least one instruction. Processor 520 may execute instructions stored in memory 500. Processor 520 may consist of a single processor or multiple processors.

[0074] Even if the power to computing device 50 is cut off, storage device 540 can maintain the stored data. For example, storage device 540 may include non-volatile memory, or may include storage media such as magnetic tape, optical disc, or magnetic disk. Programs stored in storage device 540 can be loaded into memory 500 before being executed by processor 520. Storage device 540 may store files written in a programming language, and programs generated by a compiler from these files can be loaded into memory 500. Storage device 540 may store data to be processed by processor 520 and / or data already processed by processor 520.

[0075] Input / output interface 560 can provide an interface with input devices (e.g., keyboard or mouse) and / or output devices (e.g., monitor or printer). Users can trigger processor 520 to execute programs via input devices and / or view the processing results of processor 520 via output devices.

[0076] The communication interface 580 can provide access to external networks. The computing device 50 can communicate with other devices through the communication interface 580.

[0077] Each element of the apparatus or method according to the invention can be implemented in hardware, software, or a combination of hardware and software. The function of each element can be implemented in software, and a microprocessor can be implemented to execute the software function corresponding to each element.

[0078] Various embodiments of the systems and techniques described herein can be implemented using digital electronic circuits, integrated circuits, field-programmable gate arrays (FPGAs), application-specific integrated circuits (ASICs), computer hardware, firmware, software, and / or combinations thereof. Various embodiments may include implementation using one or more computer programs executable on a programmable system. The programmable system includes at least one programmable processor (which may be a dedicated processor or a general-purpose processor), at least one input device, and at least one output device, the programmable processor being coupled to receive data and instructions from and send data and instructions to a storage system. The computer program (also referred to as a program, software, software application, or code) includes instructions for the programmable processor and is stored in a computer-readable recording medium.

[0079] Computer-readable recording media can include all types of storage devices capable of storing computer-readable data. Computer-readable recording media can be non-volatile or non-transitory media, such as read-only memory (ROM), random access memory (RAM), CD-ROM, magnetic tape, floppy disk, or optical data storage devices. Furthermore, computer-readable recording media can also include transient media, such as data transmission media. Moreover, computer-readable recording media can be distributed across computer systems connected via a network, and computer-readable program code can be stored and executed in a distributed manner.

[0080] Although the flowcharts / timing diagrams in this specification show operations as performed sequentially, this is merely an exemplary description of the technical concept of embodiments of this disclosure. In other words, those skilled in the art to which embodiments of this disclosure pertain will recognize that various modifications and alterations can be made without departing from the essential characteristics of the embodiments of this disclosure; that is, the order shown in the flowcharts / timing diagrams can be changed, and one or more operations can be performed in parallel. Therefore, the flowcharts / timing diagrams are not limited to a chronological order.

[0081] Although exemplary embodiments of the present disclosure have been described for illustrative purposes, those skilled in the art will recognize that various modifications, additions, and substitutions can be made without departing from the concept and scope of the claimed invention. Therefore, exemplary embodiments of the present disclosure have been described for the sake of brevity and clarity. The scope of the technical concept of these embodiments is not limited to the illustrations. Therefore, those skilled in the art should understand that the scope of the claimed invention is not limited to the embodiments explicitly described above, but only to the claims and their equivalents.

Claims

1. A method for controlling a backlight unit to optimize the visibility of an LCD display, the backlight unit comprising one or more LEDs, the method comprising the steps of: Obtain illumination information, sunrise information, and sunset information; Based on illuminance information, sunrise information, and sunset information, one or more regions of the backlight unit, which is divided into multiple regions of predetermined size, are determined as driving regions; as well as The backlight unit is controlled based on the driving region.

2. The method according to claim 1, wherein, The driving region is determined based on any one of the first mode, second mode, third mode, and fourth mode; and The first mode, the second mode, the third mode, and the fourth mode are determined based on the external environmental conditions of the vehicle, including the LCD display.

3. The method according to claim 2, wherein, When it is between sunrise and sunset, select the first mode.

4. The method according to claim 2, wherein, When it is after sunrise and before sunset, and the illuminance is less than a first threshold based on the illuminance information, the first mode is selected.

5. The method according to claim 2, wherein, When it is after sunrise and before sunset, and based on the illuminance information, the illuminance is greater than or equal to the first threshold and less than the second threshold, the second mode is selected.

6. The method according to claim 2, wherein, When it is after sunrise and before sunset, and based on the illuminance information, the illuminance is greater than or equal to the second threshold and less than the third threshold, the third mode is selected.

7. The method according to claim 2, wherein, When it is after sunrise and before sunset, and the illuminance is greater than or equal to the third threshold based on the illuminance information, the fourth mode is selected.

8. The method according to claim 2, wherein, The first mode is a mode in which the region containing the target image is set as the driving region among the plurality of regions.

9. The method according to claim 2, wherein, The second mode is a mode in which the region containing the target image and the four regions adjacent to the region containing the target image on the top, bottom, left, and right sides are set as the driving region.

10. The method according to claim 2, wherein, The third mode is to set the region containing the target image, the four regions adjacent to the region containing the target image on its top, bottom, left, and right sides, and the four regions adjacent to the region containing the target image on its diagonal side as the driving region among the plurality of regions.

11. The method according to claim 2, wherein, The fourth mode is a mode in which all regions of the multiple regions are set as the driving region.

12. An apparatus for controlling a backlight unit to optimize the visibility of an LCD display, the backlight unit comprising one or more LEDs, the apparatus comprising: At least one memory for storing commands; and At least one processor, The at least one processor executes the command to perform the following steps: Obtain illumination information, sunrise information, and sunset information; Based on illuminance information, sunrise information, and sunset information, one or more regions of the backlight unit, which is divided into multiple regions of predetermined size, are determined as driving regions; as well as The backlight unit is controlled based on the driving region.

13. The apparatus according to claim 12, wherein, The driving region is determined based on any one of the first mode, second mode, third mode, and fourth mode; and The first mode, the second mode, the third mode, and the fourth mode are determined based on the external environmental conditions of the vehicle, including the LCD display.

14. The apparatus according to claim 13, wherein, The first mode is a mode in which the region containing the target image is set as the driving region among the plurality of regions.

15. The apparatus according to claim 13, wherein, The second mode is a mode in which the region containing the target image and the four regions adjacent to the region containing the target image on the top, bottom, left, and right sides are set as the driving region.

16. The apparatus according to claim 13, wherein, The third mode is a mode in which the region containing the target image, the four regions adjacent to the region containing the target image on its upper, lower, left, and right sides, and the four regions adjacent to the region containing the target image on its diagonal sides are set as the driving region.

17. The apparatus according to claim 13, wherein, The fourth mode is a mode in which all regions of the multiple regions are set as the driving region.

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