KR101158852B1 - Apparatus and method for image display - Google Patents

Abstract

The present invention relates to an image display apparatus and method, wherein an image display apparatus according to an embodiment of the present invention includes an external light detection module for detecting external illuminance, and a light emitting unit control capable of ensuring visibility of an image according to the detected external illuminance. A storage module having stored therein values, and determining whether visibility of an image can be secured by a light emitting unit control value input from a user in the detected external illuminance with reference to the storage module, and emitting light on an input image according to the determination. And a control module for selectively adjusting the brightness of the unit and adjusting the visibility of the image.

Description

Image display device and method {Apparatus and method for image display}

The present invention relates to an image display apparatus and a method. More particularly, the present invention relates to reducing power consumption of an image display apparatus according to a user's power control input due to a change in external illuminance and securing an image.

In general, the power consumption of the display module in which the image is actually displayed in the display device displaying the image consumes a relatively large amount of power as compared to the power consumed in the entire display apparatus.

In addition, recently, a display device equipped with a display module supporting color has been released, and the power consumed by the display module supporting the color can be said to be greater than the power consumed by the conventional black and white display module.

At this time, the module to display is largely divided into a self-luminous display module and a non-light emitting display module. While the self-luminous display module generates light by itself, the non-emission display module needs a device for generating light separately, such as a backlight unit.

Meanwhile, the user may change the brightness of the display device according to the external illumination while watching the image through the display device. In this case, an image characteristic of the image affecting the visibility of the display device, for example, Brightness, luminance, contrast, and saturation are not taken into consideration, which may cause the visibility of the image to be degraded. In addition, since the brightness change for the display device is generally performed by signal processing for the video signal, power consumption in the display device is not considered at all in this case. Considering the fact that many image display apparatuses are miniaturized and portable in recent years, the problem of realizing the low power and compensating the visibility of the image is very important.

Korean Laid-Open Patent 2004-0054118 sets high-definition items, determines the type of data input from the outside after setting the high-definition item, and controls the preset high-definition backlight brightness when the data is for the preset high-definition item. In the case that the item is not a preset high-definition item, the power control method of the mobile communication terminal can reduce power consumption unnecessarily by controlling the preset low-definition backlight brightness, thereby increasing the battery usage time. Here, a method for minimizing the power consumption of the display device and securing the visibility of the image according to the intensity of external light is not proposed.

In addition, Japanese Laid-Open Patent Publication No. 2001-125063 discloses a method of driving a liquid crystal display device, in which the luminance of the backlight is increased when the ambient illuminance brightness of the outdoors or indoors is different, thereby gamma and luminance of the image signal. However, only a method for compensating visibility according to a change in the brightness of external light is presented here. It does not consider how to compensate the image.

The present invention minimizes the power consumed by the image display apparatus by changing the brightness and image characteristics of the display apparatus according to the intensity of external light, and prevents the deterioration of image quality due to the reduction of power consumption. And to provide a method.

Another object of the present invention is to provide an image display apparatus and method for compensating by interlocking display brightness and visibility of an original image.

The object of the present invention is not limited to the above-mentioned object, and other objects that are not mentioned will be clearly understood by those skilled in the art from the following description.

In order to achieve the above object, the image display apparatus according to an embodiment of the present invention is an external light detection module for detecting the external illuminance, and a storage module storing a light emitting unit control value capable of ensuring the visibility of the image according to the detected external illuminance And determining whether the visibility of the image can be secured by the light emitting unit control value input from the user in the detected external illuminance with reference to the storage module, and adjusting brightness of the light emitting unit with respect to the input image according to the determination. And a control module for selectively performing visibility adjustment of the image.

In addition, in order to achieve the above object, the image display method according to an embodiment of the present invention comprises the steps of (a) detecting the external illuminance, and the image by the light emitting unit control value input from the user in the detected external illuminance (B) determining whether visibility can be ensured, and (c) selectively adjusting brightness of the light emitting unit and visibility of the image according to the determination according to the determination.

By controlling the power supplied to the light emitting unit of the display device according to the intensity of the external light, the power consumption is minimized, and the image quality of the image displayed on the display device is prevented from being lowered due to the reduction of the power consumption, thereby ensuring the visibility of the image. It can be effective.

In addition, according to the present invention has the effect of compensating by interlocking the display brightness and visibility of the original image.

Specific details of other embodiments are included in the detailed description and the drawings.

Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. To fully disclose the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims.

Hereinafter, the present invention will be described with reference to a block diagram or a flowchart illustrating a video display apparatus and method according to embodiments of the present invention. At this point, it will be understood that each block of the flowchart illustrations and combinations of flowchart illustrations may be performed by computer program instructions. Since these computer program instructions may be mounted on a processor of a general purpose computer, special purpose computer, or other programmable data processing equipment, those instructions executed through the processor of the computer or other programmable data processing equipment may be described in flow chart block (s). It creates a means to perform the functions. These computer program instructions may be stored in a computer usable or computer readable memory that can be directed to a computer or other programmable data processing equipment to implement functionality in a particular manner, and thus the computer usable or computer readable memory. It is also possible for the instructions stored in to produce an article of manufacture containing instruction means for performing the functions described in the flowchart block (s). The computer program instructions It is also possible to mount on a computer or other programmable data processing equipment, so that a series of operating steps are performed on the computer or other programmable data processing equipment to create a computer-implemented process to perform the computer or other programmable data processing equipment. It is also possible for the instructions to provide steps for performing the functions described in the flowchart block (s).

In addition, each block may represent a portion of a module, segment, or code that includes one or more executable instructions for executing a specified logical function (s). It should also be noted that in some alternative implementations, the functions mentioned in the blocks may occur out of order. For example, the two blocks shown in succession may in fact be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending on the corresponding function.

The term 'display device' or 'image display device' used in the embodiments of the present invention will be described as an example of a flat panel display for compensating and displaying an image. The light emitting device may be divided into a self-luminous display device such as a plasma display panel (PDP) and organic light emitting diodes (OLED), and a non-light emitting display device such as a liquid crystal display (LCD) and a digital lighting processing (DLP).

In addition, the term 'light emitting unit' used in the embodiment of the present invention may be understood as a backlight unit of a self-luminous display device or a non-light emitting display device. In this case, the self-emission display device is used as the light emitting unit because the self-emission display device generates light by itself without using a separate backlight unit.

1 is a block diagram illustrating a schematic configuration of an image display apparatus according to an embodiment of the present invention.

Referring to FIG. 1, the image display apparatus 100 according to the present invention includes an external light detection module 110 for detecting the intensity of external light, a circle input according to the detected intensity of external light, and a light emitting unit control value input from a user. The control module 120 to determine the image compensation mode for the image, the power control module 140 to perform a low power control to minimize the power consumed in the image display apparatus 100, low power control and control of the visibility of the image Power and visibility control module 150 to perform interworking, visibility control module 160 to secure the visibility of the original image input, the storage module 130, the relationship between the external illumination and the light emitting unit control value is stored in advance ) And a light emitting unit 170.

In this case, the term 'module' used in the embodiment of the present invention means a software component or a hardware component such as an FPGA or an ASIC, and the module plays a role. However, a module is not limited to software or hardware. A module may be configured to reside on an addressable storage medium and configured to play back one or more processors. Thus, as an example, a module may include components such as software components, object-oriented software components, class components, and task components, and processes, functions, properties, procedures, subroutines. , Segments of program code, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays, and variables. The functionality provided within the components and modules may be combined into a smaller number of components and modules or further separated into additional components and modules.

The external light detection module 110 may detect the intensity of the external light due to the surrounding environment of the place where the image display apparatus 100 is located. The external light detection module 110 may be formed of an optical sensor such as a photo diode, a photo transistor, or a photoconductive device.

The control module 130 receives the intensity of the external light detected by the external light detection module 110 and the light emitting unit control value from the user, and refers to the storage module 130 to the current external illuminance and the light emitting unit control value by the user. It is determined whether or not the visibility of the image can be secured, and as a result, the image compensation mode is determined.

In the present invention, the image compensation mode includes a first mode, a second mode, and a third mode.

In the first mode, the low power function is performed by the operation by the power regulation module 140, and in the second mode, the low power and visibility is ensured by the operation by the power and visibility control module 150. In case of the third mode, the visibility control function is performed by the visibility control module 160.

Hereinafter, the operation between the modules shown in FIG. 1 will be described in detail using the flowchart shown in FIG. 2.

First, the control module 120 receives the light emitting unit control value from the user (S210). At this time, the light emitting unit control value is a control value for adjusting the amount of light emitted from the light emitting unit 170. For example, when the maximum amount of light emitted from the light emitting unit 170 is 100%, the user may emit light according to the ambient illumination. The amount of light emitted from 170 may be artificially set such as 80%, 60%, 40%, and the like. For reference, it is assumed that the amount of light emitted from the light emitting unit 170 before the light emitting unit control value is received in step S210 is 100%.

In addition, the control module 120 receives an external illuminance value detected by the external light detection module 110 (S220). In this case, steps S210 and S220 may be performed in a reversed order.

When the control module 120 receives both the light emitting unit control value and the external illuminance value, the control module 120 determines whether visibility of the input original image is secured with reference to the storage module 130 (S230). ).

At this time, the storage module 130 is previously mapped to the light emitting unit control value to ensure the visibility of the image according to the external illuminance value. Therefore, when the light emission unit control value input by the user with respect to the external illuminance value detected by the external light detection module 110 falls within a range in which visibility can be secured only by the step S260 to be described later, steps S240 and S250 are not performed. Step S260 is performed immediately, in this case, the present invention operates in the first mode, and the image control information for compensating the light emitting unit is calculated by the power adjustment module 140 (S260).

For example, when the light emitting unit control value input by the user is 50%, the power adjusting module 140 may consume only 50% of the power previously consumed for the light emitting unit 170 with respect to the current external illuminance value. Even if it is possible to secure the visibility of the image only by the image signal compensation for low power, that is, even if the power control module 140 consumes only 50% of the power previously consumed for the light emitting unit 170, only the image signal compensation for low power If the visibility of the image can be secured, it can operate at low power. Instead, since the brightness by the light emitting unit 170 is reduced, the power control module 140 calculates the image control information for compensating the light emitting unit 170 to compensate for the original video signal and displays the compensated video signal. (S270). That is, the image display apparatus 100 is operated in the first mode by the power adjustment module 140.

On the other hand, when the light emitting unit control value input by the user is 50%, even if the power adjusting module 140 consumes only 50% of the power previously consumed by the light emitting unit 170 with respect to the current external illuminance value, If it is possible to secure the visibility of the image by the compensation of the video signal and the Youngsan signal for visibility, it operates to compensate for the low power and visibility in the video signal. Instead, since the brightness by the light emitting unit 170 is reduced, the power and visibility adjustment module 150 calculates the image control information for compensating the light emitting unit 170 to compensate for the original video signal, and to the visibility for the signal. Compensating the image signal by calculating the image control information for the display to display the compensated image signal (S270). That is, the image display apparatus 100 is operated in the second mode by the power and visibility adjustment module 150.

Hereinafter, a method of compensating the original video signal according to the image control information will be described in detail with reference to FIGS. 3 to 5.

3 is a graph illustrating an image conversion relationship for performing brightness compensation for a light emitting unit according to an embodiment of the present invention, and FIG. 4 is a flowchart illustrating a method of obtaining the graph shown in FIG. 3.

Referring to FIG. 3, a graph displayed as '310' represents a relationship when the original image is not compensated, and a graph represented as '320' represents a relationship when the original image is compensated. For example, when the pixel of the input image is displayed with 8 bits, the pixel information of the input image has 2 ⁸ = 256 pixel information (0 to 255).

In addition, the pixel information section of the input image, that is, the original image, may be divided into two sections. Among the first section 302, the pixel of the output image according to a graph in which the pixel value of the original image is displayed as '310'. Since it is converted into a value, the original image is not substantially compensated. In the second section 304, the pixel value of the original image is increased by a predetermined width to compensate.

More specifically, when the pixel value of the original image is P1, since P1 belongs to the first section 302, the pixel value of the output image is Q1 without being compensated. However, when the pixel value of the original image is P2, since P2 belongs to the second section 304, the pixel value of the output image becomes Q3 instead of Q2 according to the graph indicated by '310'. That is, | Q2-Q3 | As the pixel value of the original image is increased. In the present specification, a value corresponding to a boundary between the first section 302 and the second section 304 is represented as a 'threshold value', and an increase amount for the pixel value of the original image such as | Q2-Q3 | The threshold value and the compensation amount correspond to the image control information.

In this case, the threshold value may be determined by the light emitting unit control value input from the user (S410). For example, the power adjustment module 140 may include a table indicating a relationship between the light emission unit control value and the threshold value, and determine a threshold value corresponding to the light emission unit control value input from the user.

In addition, the length of the first section 302 and the size of | Q3-Q2 | with respect to P2 in the second section 304 may increase proportionally according to the decrease in brightness of the backlight unit. In this case, the size may be determined by the light emission unit control value input from the user of the brightness reduction amount of the backlight unit.

In addition, the length of the first section 302 and the size of | Q3-Q2 | with respect to P2 in the second section 304 may be adjusted according to the pixel value distribution characteristic of the input image. As a specific example of the adjustment according to the pixel value distribution characteristic of the image, when the image pixel values to be displayed are distributed in the low luminance region, the length of the first section 302 is shortened and the size of | Q3-Q2 | By making it small, it is possible to increase the low luminance gradation power that is reduced due to the reduced brightness of the backlight unit. As a result, a clearer screen can be provided.

Meanwhile, although FIG. 3 shows that the pixel information of the original image is compensated, it may be understood that it is compensated using the luminance component of the original image. That is, it may be understood that when the luminance information of the pixel of the original image is less than or equal to the threshold pixel information, the luminance component is increased by the compensation amplitude only when the luminance information is not performed.

3 illustrates that the pixel value of the original image is the pixel value of the output image as it is in the first section 302, but is not limited thereto. That is, the pixel value in the first section 302 may be improved by a compensation amount of a predetermined size as in the second section 304.

When the threshold value is determined, the power adjustment module 140 determines a brightness compensation function for each area divided according to the threshold value (S420).

In this case, the brightness compensation function may be determined by the image control information. In addition to the threshold value and the compensation amount, the image control information may select a coefficient set or each coefficient according to image characteristics. May contain a value. Meanwhile, for convenience of explanation, the threshold value is represented by 'TH' and the compensation amount is represented by 'g'.

The threshold value and the compensation amount may be proportionally changed according to the brightness reduction amount of the light emitting unit, and may be adjusted according to the pixel value distribution characteristic of the input image. For example, when a large number of image pixel values are distributed in a low luminance region, the threshold value is reduced and the amount of compensation amount is reduced, thereby increasing the low luminance gradation power due to the decrease in brightness of the light emitting unit. It will be able to provide a clearer screen.

The power adjustment module 140 may determine TH through a lookup table indicating a constant relationship between the power level reduction information by the light emitting unit control value input from the user and the threshold value TH. For example, when the brightness of the screen is greatly reduced by decreasing the power level, the TH value may be decreased. For this purpose, a lookup table in which the TH value is recorded according to the decrease amount of the screen brightness is included in the power control module. The data may be stored in the 140 or in a separate memory included in the image display apparatus 100. The compensation amount g may be determined according to the pixel information of the input original image, and the determination of the compensation amount g may be determined from a lookup table indicating a relationship between the pixel information and the compensation amount g.

In addition, the threshold value TH and the compensation amount g may be generated by a function that takes as a parameter the amount of reduction in screen brightness and pixel information of the original image, respectively. In addition, the threshold value TH and the compensation amount g may be preset to a fixed value optimized experimentally.

If the pixel information x of the original image is equal to or smaller than the threshold TH, the compensation for the original image is not performed. If the pixel information x is larger than the threshold TH, the pixel information x may be compensated. Equation 1].

if x> TH

y1 = F * g

else,

y2 = x

In this case, y1 represents pixel information of the compensated image, and F represents a brightness compensation function having characteristics of a graph represented by '320' as illustrated in FIG. 3. The brightness compensation function F may be determined by using information about pixels of the original image as a parameter.

For example, the brightness compensation function F may be expressed by a polynomial as shown in [Equation 2].

F (x) = a * x ⁵ + b * x ⁴ + c * x ³ + d * x ² + e * x ¹ + f

In this case, the coefficients a, b, c, d, e, and f may be determined according to pixel information of an original image that is experimentally obtained or input.

On the other hand, the values of x satisfying the intersection of y1 and y2, that is, x = (ax ⁵ + bx ⁴ + cx ³ + dx ² + ex ¹ + f) * g from [Equation 1] and [Equation 2], Corresponding to the threshold TH, the value of each coefficient and the value of the compensation amount g may be set to satisfy this.

When the original image is converted by the graph 320 illustrated in FIG. 3, even though the power consumption of the light emitting unit is reduced and the screen brightness of the image display apparatus 100 becomes dark, the pixel information increases by the amount of compensation, so that the user's position is changed. In addition to being able to continuously view images with almost the same brightness, image information having a value smaller than the threshold TH is output as it is, resulting in a relatively contrast effect, thereby maintaining visibility by the user. Will be. In this regard, it will be described with reference to FIGS. 5A and 5B.

On the other hand, if x represents the luminance component of the original image, F * g represents the compensated luminance information, and the original image may be output with the luminance component compensated.

5A and 5B are diagrams for comparing image characteristics in a low gray scale region according to an exemplary embodiment of the present invention, in which FIG. 5A illustrates a case according to the prior art and FIG. 5B illustrates a case according to the present invention. .

When the power consumption of the light emitting unit is reduced, the brightness of the display screen is reduced. In this case, when the conventional technology is applied as shown in FIG. 5A, the gray scale distinguishing power of the image represented by the dotted line is significantly reduced.

However, according to the present invention as shown in FIG. 5B, the gray scale discrimination power in the low gray scale region is maintained even though the luminance on the display screen is reduced by maintaining the gray scale change value in the low gray scale section indicated by the dotted line as the original image value. At the same time, it is possible to prevent the deterioration of the quality of the original image by improving brightness and contrast characteristics at the halftone and higher.

On the other hand, when the light emitting unit control value input by the user with respect to the external illuminance value detected by the external light detection module 110 in step S230 does not belong to a range capable of ensuring visibility only by the visibility compensation of the image signal, the control module Calculates an appropriate light emission unit control value capable of ensuring visibility (S240).

For example, when the maximum amount of light emitted from the light emitting unit 170 is 100%, the user sets the amount of light emitted from the light emitting unit 170 to 60% according to the ambient illumination, but if visibility is not secured, the control module 120 Calculate the appropriate light emission unit control value. That is, the control module 120 can secure visibility by resetting the light emission unit control value to 80%. As such, when the appropriate light emitting unit control value capable of securing visibility is calculated, the image display apparatus 100 is operated in the second mode by the power and visibility adjustment module 150. However, in some cases, it is necessary to maintain the amount of light emitted from the light emitting unit 170 at 100% due to the influence of ambient illuminance. In this case, the image display apparatus 100 is controlled by the visibility control module 160. Will operate in mode.

As a result, when the proper light emitting unit control value is calculated, the image display apparatus 100 operates in the second mode, and when the proper light emitting unit control value is not calculated, that is, the amount of light emitted from the light emitting unit 170 is maintained at 100%. If it is necessary to operate in the third mode.

In the third mode, the visibility control module 160 controls the light emitting unit 170 to maintain the amount of light emitted from the light emitting unit 170 at 100% (S250). Then, the image control information for compensating external illumination, that is, visibility is calculated (S260), to compensate for the original image signal, and to display the compensated image signal (S270).

The visibility control method by the visibility control module 160 will be described with reference to FIGS. 6A and 6B.

6A and 6B illustrate compensation of an image using weights given according to the saturation of the image and the brightness of the surrounding environment when the brightness of the external light is brighter than the brightness of the light emitting unit. 6B shows that weights are set differently.

For example, in the case of FIG. 6A, when the saturation values of the pixels constituting one image are 25, 50, and 75, the pixels having the saturation values are all adjusted with the same weight to ensure visibility.

In contrast, in the case of FIG. 6B, when the saturation values of the pixels constituting one image are 25, 50, and 75, pixels having these saturation values may be controlled by adjusting the brightness with different weights, thereby ensuring visibility.

6A and 6B may be understood as a visibility compensation function indicating a saturation-brightness relationship for each visibility compensation level. In this case, the visibility compensation level is an indicator indicating how much visibility is to be compensated according to external illumination, and this indicator may be set in advance.

On the other hand, when the appropriate light emitting unit control value is calculated in step S240, the power and visibility adjustment module 150 controls the light emitting unit 170 using the reset light emitting unit control value (S250). In the previous example, the power and visibility adjustment module 150 controls the light emitting unit 170 with a light emitting unit control value of 80%. This allows the light emitting unit 170 to save 20% power consumption. Then, the power and visibility adjustment module 150 calculates image control information for compensating for the reduced brightness of the light emitting unit and image control information for securing visibility (S260), and based on the image control information, the original image. After compensating the signal, the compensated image signal is displayed (S270). That is, in the second mode, compensation for the light emitting unit and compensation for visibility by external illumination are performed in conjunction.

Since the compensation method for the light emitting unit and the compensation method for visibility by external illuminance have been described above, a description thereof will be omitted. However, in the second mode, the two compensation methods are performed in conjunction with each other by the power and visibility control module 150, and thus the interlocking method will be described.

First, as shown in the graph of FIG. 3, assuming that the brightness compensation function for compensating the brightness of the light emitting unit is Fb, the visibility compensation function is Fv, the weight for Fb is α, and the weight for Fv is β, α = Suppose C is β = 1-C. In this case, C is an image control parameter for adjusting an application weight for brightness compensation and visibility compensation for the light emitting unit, and it is determined whether compensation of brightness compensation and visibility compensation for the light emitting unit is to be enhanced according to the image control parameter C value. do. The image control parameter C may be preset and stored in the storage module 130 according to the light emission unit control value input from the user and the external illuminance detected by the external light detection module 110, and the control module 120 may store the image control parameter C. The image control parameter C value may be determined with reference to the module 130.

If C = 1, only the brightness of the light emitting unit is compensated for the original image signal, and if C = 0, only visibility is compensated for the original image signal. In other words, when C = 1, the first mode is used. If C = 0, the third mode is used. When C is greater than 0 and less than 1, the second mode is operated.

As a result, if the image compensation function for compensating the image in the image display apparatus 100 is Fc, Fc may be expressed as Equation (3).

Fc = Fb * C + Fv * (1-C)

In this case, Fb and Fv respectively represent a brightness compensation function and a visibility compensation function as described above.

Although embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art to which the present invention pertains may implement the present invention in other specific forms without changing the technical spirit or essential features thereof. You will understand that. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.

1 is a block diagram illustrating a schematic configuration of an image display apparatus according to an embodiment of the present invention.

2 is a flowchart illustrating an image display method according to an embodiment of the present invention.

3 is a graph illustrating an image conversion relationship for performing brightness compensation on a light emitting unit according to an embodiment of the present invention.

FIG. 4 is a flow chart illustrating a method of obtaining the graph shown in FIG. 3.

5A and 5B are diagrams for comparing image characteristics in a low gray scale area according to an exemplary embodiment of the present invention.

6A and 6B are diagrams illustrating a method for improving visibility according to an embodiment of the present invention.

DESCRIPTION OF THE REFERENCE NUMERALS

100: video display device

110: external light detection module

120: control module

130: storage module

140: power regulation module

150: power and visibility control module

160: visibility adjustment module

170: light emitting unit

Claims (24)

delete An external light detection module for detecting external illuminance; A storage module storing a light emitting unit control value capable of ensuring visibility of an image according to the detected external illuminance; With reference to the storage module, it is determined whether the visibility of the image can be secured by the light emitting unit control value input from the user in the detected external illuminance, and according to the determination, brightness control of the light emitting unit for the input image and A control module for selectively performing visibility control; And The light emitting unit is controlled by the input light emitting unit control value according to the determination of the control module, a threshold value is determined based on the input light emitting unit control value, and the input image is determined based on the determined threshold value. And a power adjustment module for dividing the image information into large and small cases and converting the input image by image control information. 3. The method of claim 2, And the image control information is information for increasing the image information by a predetermined size. 3. The method of claim 2, And the power adjustment module does not convert the image information when the image information is smaller than the threshold. 3. The method of claim 2, And the power adjustment module increases and converts the image information by a predetermined size when the image information is smaller than the threshold value. 3. The method of claim 2, The power adjustment module may be configured to perform image information on the original image when the image information on the original image belongs to the first section among the first and second sections of the input image divided based on the threshold value. The display apparatus of claim 1, wherein the image information of the original image is converted by the image control information when the image is maintained in the second section. The method according to claim 6, And the image control information is information for increasing the image information by a predetermined size. An external light detection module for detecting external illuminance; A storage module storing a light emitting unit control value capable of ensuring visibility of an image according to the detected external illuminance; With reference to the storage module, it is determined whether the visibility of the image can be secured by the light emitting unit control value input from the user in the detected external illuminance, and according to the determination, brightness control of the light emitting unit for the input image and A control module for selectively performing visibility control; And And a power and visibility adjustment module configured to perform brightness compensation and visibility compensation on the light emitting unit in accordance with the determination of the control module. 9. The method of claim 8, And the power and visibility control module performs the linkage between the brightness compensation and the visibility compensation by using an image control parameter for adjusting an application weight for the brightness compensation and the visibility compensation. An external light detection module for detecting external illuminance; A storage module storing a light emitting unit control value capable of ensuring visibility of an image according to the detected external illuminance; With reference to the storage module, it is determined whether the visibility of the image can be secured by the light emitting unit control value input from the user in the detected external illuminance, and according to the determination, brightness control of the light emitting unit for the input image and A control module for selectively performing visibility control; And And a visibility control module configured to compensate for the input image by adjusting the brightness according to the weight given according to the saturation of the input image and the brightness of the surrounding environment according to the determination of the control module. The method of claim 10, The weight is applied equally to all the pixels constituting one image. The method of claim 10, The weight is applied differently according to the saturation value of the pixels. delete Detecting external illuminance (a); (B) determining whether the visibility of the image can be secured by the light emission unit control value input from the user in the detected external illuminance; And (C) selectively adjusting brightness of the light emitting unit and visibility of the image according to the determination, In step (c), (C-1) controlling the light emitting unit by the input light emitting unit control value according to the determination; A threshold value is determined based on the input light emitting unit control value, and the image information of the input image is divided into a large case and a small case based on the determined threshold value, and the input image is converted by the image control information. The image display method comprising the step (c-2). 15. The method of claim 14, And the image control information is information for increasing the image information by a predetermined size. 15. The method of claim 14, The step (c-2) is a step of not converting the image information when the image information is smaller than the threshold value. 15. The method of claim 14, In the step (c-2), when the image information is smaller than the threshold, the image information is increased by a predetermined size and converted. 15. The method of claim 14, In the step (c-2), when the video information of the original image belongs to the first section among the first section and the second section of the input image divided based on the threshold value, the original image is included in the first section. And maintaining the image information of the image as it is, and converting the image information of the original image by the image control information when belonging to the second section. The method of claim 18, And the image control information is information for increasing the image information by a predetermined size. Detecting external illuminance (a); (B) determining whether the visibility of the image can be secured by the light emission unit control value input from the user in the detected external illuminance; And (C) selectively adjusting brightness of the light emitting unit and visibility of the image according to the determination, In the step (c), the brightness display and visibility compensation for the light emitting unit are performed in accordance with the determination. The method of claim 20, In the step (c), performing the linkage between the brightness compensation and the visibility compensation using an image control parameter for adjusting an application weight for the brightness compensation and the visibility compensation. Detecting external illuminance (a); (B) determining whether the visibility of the image can be secured by the light emission unit control value input from the user in the detected external illuminance; And (C) selectively adjusting brightness of the light emitting unit and visibility of the image according to the determination, The step (c) is a step of compensating for the input image by adjusting the brightness according to the weight given according to the saturation of the input image and the brightness of the surrounding environment according to the determination. 23. The method of claim 22, The weight is applied equally to all the pixels constituting one image. 23. The method of claim 22, The weight is applied differently according to the saturation value of the pixels.

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