Display apparatus and method for controlling the same

Abstract

A control method for a display device according to an embodiment of the present invention comprises the steps of: executing a blue light reduction function; receiving image data; compressing the range of brightness (V) and saturation (S) that apply to all of the received image data; adjusting a brightness value in a first region within the received image data; adjusting a saturation value in a second region within the received image data; and adjusting a color value (H) in a third region within the received image data.

Description

Technology Field

[0001] Embodiments of the present invention are directly or indirectly related to display devices, T-CONs (Timing Controllers), etc. More specifically, for example, they can be applied to any device equipped with a low-power mode, a blue light function, etc. Background Technology

[0002] Currently, various display devices such as smartphones, TVs, and VR are in use.

[0003] Meanwhile, blue light reduction technology is a technology that protects the user's eyes by reducing the emission of blue light from the aforementioned display devices. For reference, the high-energy light generated by blue light can cause eye fatigue and sleep disturbances, and there was also the problem of relatively rapid aging of the devices.

[0004] Furthermore, when blue light reduction technology was applied, there was a problem where overall color degradation occurred in the video, leading to decreased user satisfaction.

[0005] In addition, blue pixels used in OLED (Organic Light Emitting Diode) panels and the like had a problem of relatively high power consumption compared to other color pixels due to their low energy efficiency. The problem to be solved

[0006] One embodiment of the present invention aims to prevent noticeable color degradation when a display device activates a blue light reduction mode by solving the problems of the aforementioned prior art.

[0007] Furthermore, by reducing the use of blue pixels in display devices, we aim to improve power consumption and slow down the aging of the display panel as much as possible. means of solving the problem

[0008] A control method for a display device according to an embodiment of the present invention for solving the aforementioned technical problem comprises the steps of: executing a blue light reduction function; receiving image data; compressing the range of brightness (V) and saturation (S) that apply to all of the received image data; adjusting a brightness value in a first region within the received image data; adjusting a saturation value in a second region within the received image data; and adjusting a color value (H) in a third region within the received image data.

[0009] Furthermore, the compression step may be characterized by increasing the brightness compression information as the overall brightness of the received image data becomes darker, for example.

[0010] In addition, the compression step may be characterized by reducing the degree of brightness compression as the overall brightness of the received image data becomes brighter, for example.

[0011] The above compression step further includes, for example, a step of analyzing the saturation distribution of the received image data and a step of changing the degree of compression of the saturation according to the analysis result.

[0012] The above-mentioned changing step may be designed to further include, for example, a step of reducing the degree of compression of saturation when the saturation distribution of the received image data is greater than or equal to a preset threshold value for each region, and a step of increasing the degree of compression of saturation when the saturation distribution of the received image data is less than the preset threshold value for each region.

[0013] The above third region includes, for example, at least one of a first range between Cyan and Green or a second range between Magenta and Red in the HSV color space.

[0014] A display device according to an embodiment of the present invention includes a receiving module for receiving image data and a controller for performing a blue light reduction function, compressing the range of brightness (V) and saturation (S) that apply to all of the received image data, adjusting a brightness value in a first area within the received image data, adjusting a saturation value in a second area within the received image data, and adjusting a color value (H) in a third area within the received image data. Effects of the invention

[0015] According to one embodiment of the present invention, when a display device activates a blue light reduction mode, there is a technical effect of preventing noticeable color degradation. In addition, the problem of image quality degradation can be further resolved to the extent that the user does not perceive the blue light reduction mode.

[0016] Furthermore, reducing the use of blue pixels in display devices has the advantage of improving power consumption and slowing down the aging of the display panel as much as possible.

[0017] In addition, in addition to the effects of the invention explicitly described herein, technical effects that can be inferred by a person skilled in the art from the specification and drawings also fall within the other scope of the rights of the present invention. Brief explanation of the drawing

[0018] FIG. 1 illustrates a display device in which a blue light reduction mode is executed according to the prior art. FIG. 2 illustrates an exemplary HSV color space to which an embodiment of the present invention can be applied. FIG. 3 is a block diagram illustrating the components of a display device according to an embodiment of the present invention. FIG. 4 illustrates the relationship between the input and output of image data based on value, resulting from the operation of a global data processing unit of a display device according to an embodiment of the present invention. FIG. 5 illustrates the relationship between the input and output of image data based on saturation, resulting from the operation of a global data processing unit of a display device according to an embodiment of the present invention. FIG. 6 illustrates the relationship between the input and output of image data based on value, resulting from the operation of a local data processing unit of a display device according to an embodiment of the present invention. FIG. 7 illustrates the relationship between the input and output of image data based on saturation, resulting from the operation of a local data processing unit of a display device according to an embodiment of the present invention. FIG. 8 is a diagram illustrating a change in the target Hue area due to the operation of the local data processing unit of a display device according to an embodiment of the present invention. FIG. 9 illustrates a display device in which a blue light reduction mode is executed according to an embodiment of the present invention. FIG. 10 is a histogram showing the distribution of blue pixel values ​​of a display device in which a blue light reduction mode is executed according to an embodiment of the present invention. And, FIG. 11 is a flowchart illustrating a control method of a display device according to an embodiment of the present invention. Specific details for implementing the invention

[0019] Throughout the specification, identical reference numbers denote substantially identical components. In the following description, detailed descriptions of components and functions known in the art may be omitted if they are not related to the core components of the invention. The meanings of the terms described in this specification should be understood as follows.

[0020] The advantages and features of the present invention and the methods for achieving them will become clear by referring to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below but may be implemented in various different forms. These embodiments are provided merely to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the invention, and the present invention is defined only by the scope of the claims.

[0021] The shapes, sizes, ratios, angles, numbers, etc. disclosed in the drawings for explaining embodiments of the present invention are exemplary, and therefore the present invention is not limited to the depicted details. Throughout the specification, the same reference numerals refer to the same components. Furthermore, in describing the present invention, if it is determined that a detailed description of related known technology may unnecessarily obscure the essence of the present invention, such detailed description is omitted.

[0022] Where terms such as 'includes,' 'have,' 'consists of,' etc. are used in this specification, other parts may be added unless 'only' is used. Where a component is expressed in the singular, it includes cases where it includes the plural unless specifically explicitly stated otherwise.

[0023] In interpreting the components, they are interpreted to include a margin of error even in the absence of a separate explicit statement.

[0024] In the case of describing a positional relationship, for example, when the positional relationship between two parts is described using expressions such as 'on,' 'upper,' 'lower,' or 'next to,' one or more other parts may be located between the two parts unless 'immediately' or 'directly' is used.

[0025] In the case of an explanation of a temporal relationship, for example, when a temporal sequence is explained using 'after', 'following', 'next', 'before', etc., it may include cases where the sequence is not continuous unless 'immediately' or 'directly' is used.

[0026] Although terms such as "first," "second," etc. are used to describe various components, these components are not limited by these terms. These terms are used merely to distinguish one component from another. Accordingly, the first component mentioned below may be the second component within the technical scope of the present invention.

[0027] The term “at least one” should be understood to include all combinations that can be presented from one or more related items. For example, the meaning of “at least one of the first item, the second item and the third item” may mean not only the first item, the second item or the third item individually, but also all combinations of items that can be presented from two or more of the first item, the second item and the third item.

[0028] The features of each of the various embodiments of the present invention may be combined or combined with one another, either partially or wholly, and may technically enable various interlocking and operation. Each embodiment may be implemented independently of one another or may be implemented together in an associated relationship.

[0029] Hereinafter, embodiments of the present specification will be described in detail with reference to the attached drawings.

[0030] FIG. 1 illustrates a display device in which a blue light reduction mode is executed according to the prior art.

[0031] Figure 1 (a) shows the screen before the blue light reduction mode is activated, whereas Figure 1 (b) shows the screen after the blue light reduction mode is activated.

[0032] As shown in Fig. 1(b), image quality degradation due to color degradation appearing throughout the image is perceived. Therefore, there is a problem in that the blue spot reduction mode is not used effectively.

[0033] On the other hand, according to one embodiment of the present invention, global-local data processing is designed to be performed by considering color constancy characteristics, relative brightness perception characteristics, and color space shift characteristics of blue pixel value reduction.

[0034] First, I will explain why the display device according to one embodiment of the present invention considers color consistency characteristics.

[0035] It is necessary to consider the sensitivity to overall color degradation occurring within the user's field of vision. In other words, during global data processing, data is processed using only Value and Saturation instead of Hue. Therefore, from the user's perspective, there is the advantage of not feeling that the depth of color expression has been reduced.

[0036] Next, I will explain why the display device according to one embodiment of the present invention considers relative brightness perception characteristics.

[0037] It is necessary to consider the characteristic that users are more sensitive to changes in dark tones than to changes in bright tones.

[0038] Globally, it is designed to compress values ​​primarily around blue pixels. On the other hand, locally, it increases the contrast between values ​​while relatively suppressing the degree of brightness increase. Therefore, although the range of values ​​is reduced, there is a technical effect in that the sharpness perceived by the user in the image is enhanced.

[0039] Finally, I will explain why the display device according to one embodiment of the present invention considers the color space shift characteristics of the reduction of blue pixel values.

[0040] The relationship between the blue pixel value and hue, saturation, and value is considered first. Then, efficient gain and offset are calculated to reduce the blue pixel value.

[0041] Meanwhile, the color space mentioned in this specification may be the HSV color space, and an embodiment related thereto will be described below with reference to FIG. 2. However, the present invention is not limited to the HSV color space only.

[0042] FIG. 2 illustrates an exemplary HSV color space to which an embodiment of the present invention can be applied.

[0043] H (210) shown in FIG. 2 stands for Hue, S (220) stands for Saturation, and V (230) stands for Value. Meanwhile, although a cylinder is illustrated as an example in FIG. 2, the present invention can also be applied to a cone-shaped HSV color space.

[0044] H(Hue) means, for example, color or type of color.

[0045] S (Saturation) refers, for example, to color saturation, the degree of dullness and vividness of a color.

[0046] V(Value) represents, for example, the brightness of light.

[0047] The color (H) has a range of 0 to 360 degrees, but since it can only be expressed from 0 to 255 when represented within an 8-bit range, the H value is expressed within the range of 0 to 179.

[0048] Saturation (S) is represented as 255 when expressing the most intense state of a specific color using 8 bits, indicating the intensity of the color. If it is 0, it represents an achromatic color of the same brightness.

[0049] Value (V) indicates the degree of brightness, and if white is 255, black is 0.

[0050] For example, assuming that the present invention is applied to the HSV color space shown in FIG. 2, FIG. 3 and others will be explained below.

[0051] FIG. 3 is a block diagram illustrating the components of a display device according to an embodiment of the present invention.

[0052] As described above, the objective of the present invention is to numerically reduce blue pixel values. By doing so, the perception of image quality degradation, such as color degradation or blurriness, is to be minimized.

[0053] Color constancy has the advantage of allowing our eyes to perceive the original colors of objects while ignoring the influence of ambient lighting, but it makes us sensitive to whether color degradation is occurring overall within the current field of vision.

[0054] Due to these characteristics, users feel frustrated when using existing blue light reduction functions because they perceive a degradation in image quality. Considering these characteristics, the present invention adjusts only the value and saturation in the color space during the global image data processing process so that blue pixel values ​​are reduced without causing color degradation.

[0055] The relative brightness perception characteristic is the characteristic that our eyes determine the brightest and darkest levels through relative comparison within the current field of vision.

[0056] By utilizing these characteristics, when processing local data, the design adjusts the relative contrast in the compressed Value and Saturation so that the difference between the dark and bright Value and the dull and clear Saturation does not differ significantly from the original.

[0057] Shifts in the HSV color space (changes in Hue / Saturation / Value) cause changes in RGB pixel values. First, a decrease in Value reduces blue pixel values ​​regardless of color. An increase in Saturation reduces blue pixel values ​​for colors that are not bluish. Finally, in the Hue region between Magenta-Red and Cyan-Green, blue pixel values ​​decrease as they move further away from the blue value. In the data processing process of the present invention, the objective was efficiently achieved by focusing on these shifts in the color space that reduce blue pixel values.

[0058] As illustrated in FIG. 3, the display device (300) includes, for example, a global data processing unit (310) and a local data processing unit (320). Meanwhile, the display device (300) illustrated in FIG. 3 may be implemented, for example, as a T-CON (Timing Controller).

[0059] Meanwhile, although not shown in FIG. 3, a receiving module in the display device (300) receives image data (e.g., an input image shown in FIG. 3).

[0060] Furthermore, the controller (e.g., 310 / 320 shown in FIG. 3) performs a blue light reduction function and compresses the range of brightness (V) and saturation (S) that are applied to all received image data.

[0061] Additionally, the controller adjusts the brightness value in the first area of ​​the received image data, adjusts the saturation value in the second area of ​​the received image data, and adjusts the color value (H) in the third area of ​​the received image data.

[0062] In particular, the controller increases the degree of brightness compression as the overall brightness of the received image data becomes darker, and decreases the degree of brightness compression as the overall brightness of the received image data becomes brighter. A more specific embodiment related to this will be described below with reference to FIG. 4.

[0063] Furthermore, the controller analyzes the saturation distribution of the received image data and changes the degree of saturation compression according to the analysis result. For example, if the saturation distribution of the received image data is greater than or equal to a preset threshold value for each region, the degree of saturation compression is reduced, and if the saturation distribution of the received image data is less than the preset threshold value for each region, the degree of saturation compression is increased. A more specific embodiment related thereto will be described below with reference to FIG. 5.

[0064] In addition, the aforementioned third region includes at least one of a first range between Cyan and Green or a second range between Magenta and Red in the HSV color space. More specific embodiments related thereto will be described below with reference to FIG. 8.

[0065] The global data processing unit (310) illustrated in FIG. 3 analyzes the value distribution and saturation distribution characteristics of the input image. Furthermore, by reflecting the analyzed distribution characteristics and intensity control options, it performs compression for, for example, the HSV color space.

[0066] The specific functions of the Value compression unit (311) and Saturation compression unit (312) included in the global data processing unit (310) will be explained in more detail with reference to FIG. 4 and FIG. 5, respectively.

[0067] The regional data processing unit (320) illustrated in FIG. 3 analyzes the value distribution, saturation distribution, and hue characteristics of a specific region. Furthermore, by reflecting the analyzed characteristics and intensity adjustment options, it increases the contrast in the HSV color space and processes the hue values.

[0068] The specific functions of the Value adjustment unit (321), Saturation adjustment unit (322), and Target Hue area processing unit (323) included in the regional data processing unit (320) will be explained in more detail with reference to FIGS. 6, FIGS. 7, and FIGS. 8, respectively.

[0069] FIG. 4 illustrates the relationship between the input and output of image data based on value, resulting from the operation of a global data processing unit of a display device according to an embodiment of the present invention.

[0070] In Figure 4 (a), number 410 is a graph for the prior art, and the value is not compressed according to the brightness of the image.

[0071] On the other hand, according to one embodiment of the present invention, the value distribution of an input image is analyzed to determine the degree of compression of the value in the HSV color space.

[0072] For example, as shown in graph 420 of Figure 4 (a), the darker the image, the greater the compression for the value of the image, and the brighter the image, the less compression for the value of the image.

[0073] Furthermore, according to another embodiment of the present invention, the degree of compression for all colors can be additionally adjusted. In particular, as shown in FIG. 4(b), the compression rate for the blue color (421) can be weighted compared to other colors (422).

[0074] FIG. 5 illustrates the relationship between the input and output of image data based on saturation, resulting from the operation of a global data processing unit of a display device according to an embodiment of the present invention.

[0075] In Fig. 5(a), number 510 is a graph for the prior art, and does not specifically compress saturation in the HSV color space.

[0076] On the other hand, according to one embodiment of the present invention, the saturation distribution of an input image is analyzed to determine the degree of saturation compression in the HSV color space.

[0077] For example, as shown in graph 520 of Figure 5 (a), when the saturation is generally concentrated in a narrow range, the compression of the saturation is reduced, and when the saturation is generally evenly distributed, the compression of the saturation is increased.

[0078] If the saturation distribution of the received image data is greater than or equal to a preset threshold value for each region, the degree of saturation compression is reduced. On the other hand, if the saturation distribution of the received image data is less than a preset threshold value for each region, the degree of saturation compression is increased.

[0079] However, since using threshold values ​​may result in situations where they change frequently, interpolation of preset values ​​may be used to suppress unnaturalness.

[0080] To explain more specifically with an example, in the saturation compression process, the relationship curve shown in Fig. 5 (a) must be created, and for this purpose, two pieces of information are required: "saturation distribution (degree of spread) according to color" and "preset value according to color".

[0081] The two pieces of information mentioned above have an inverse relationship, and the amount of compression depends on the preset value.

[0082] The process related to this can be summarized and explained as follows.

[0083] First, one embodiment of the present invention analyzes saturation by color.

[0084] Second, one embodiment of the present invention processes the analyzed information into preset values ​​to calculate the numerical value of the "range to be compressed".

[0085] Third, one embodiment of the present invention obtains relationship covers by color using the numerical value of the "range to be compressed".

[0086] Fourth, one embodiment of the present invention obtains a new saturation value with a compressed range by applying the saturation value to a relationship curve and processing the data.

[0087] Furthermore, according to another embodiment of the present invention, the degree of compression for all colors can be additionally adjusted. In particular, as shown in FIG. 5 (b), the compression rate for the blue color (521) can be weighted compared to other colors (522).

[0088] FIG. 6 illustrates the relationship between the input and output of image data based on value, resulting from the operation of a local data processing unit of a display device according to an embodiment of the present invention.

[0089] In Fig. 6 (a), number 610 is a graph of the prior art, and by analyzing the representative value of brightness in a specific area, the contrast between brightness values ​​is not increased.

[0090] On the other hand, according to one embodiment of the present invention, the representative value of the brightness of a specific area of ​​an input image is analyzed to increase the contrast between brightness values.

[0091] Here, the representative value of brightness for a specific area refers, for example, to the representative value of brightness obtained through local pixel analysis.

[0092] In other words, it refers to a value representing the local area to be analyzed, such as the average or median of the brightness of multiple pixels. The size of the local analysis area may be pre-set, for example, but is not necessarily limited to this.

[0093] Meanwhile, the reason for performing local pixel analysis is that when humans observe an image, they look globally, but they also perceive detailed expressions by viewing locally (small areas).

[0094] For example, as shown in graph 620 of Fig. 6 (a), if the value is smaller than the representative value of a specific area, it is adjusted to have a smaller brightness value, and if the value is larger than the representative value of a specific area, it is adjusted to have a larger brightness value.

[0095] Furthermore, according to another embodiment of the present invention, as shown in FIG. 6(b), a weight can be given to the increase rate of the value relative to the blue color (621) compared to other colors (622).

[0096] FIG. 7 illustrates the relationship between the input and output of image data based on saturation, resulting from the operation of a local data processing unit of a display device according to an embodiment of the present invention.

[0097] In Fig. 7 (a), number 710 is a graph of the prior art, and by analyzing the representative saturation value of a specific area, the contrast between saturation values ​​is not increased.

[0098] On the other hand, according to one embodiment of the present invention, the representative saturation value of a specific region of an input image is analyzed to increase the contrast between saturation values.

[0099] Here, the representative saturation value of a specific area refers, for example, to the representative saturation value obtained through local pixel analysis.

[0100] In other words, it refers to a value representing the local area to be analyzed, such as the average or median of the saturation of multiple pixels. The size of the local analysis area may be pre-set, for example, but is not necessarily limited to this.

[0101] Meanwhile, the reason for performing local pixel analysis is that when humans observe an image, they look globally, but they also perceive detailed expressions by viewing locally (small areas).

[0102] For example, as shown in graph 720 of Fig. 7 (a), if the value is smaller than the representative value of a specific area, it is adjusted to have a smaller saturation value, and if the value is larger than the representative value of a specific area, it is adjusted to have a larger saturation value.

[0103] Furthermore, according to another embodiment of the present invention, as shown in FIG. 7(b), a weight can be given to the increase rate of saturation for the blue color (721) compared to other colors (722).

[0104] FIG. 8 is a diagram illustrating a change in the target Hue area due to the operation of the local data processing unit of a display device according to an embodiment of the present invention.

[0105] According to one embodiment of the present invention, an offset is calculated and applied to a target hue area that changes the blue pixel value as a result of a change in the hue value.

[0106] The target hue region illustrated in FIG. 8 has the following characteristics. The target hue region refers to the region between cyan and green (810) and the region between magenta and red (820), and data processing occurs only in these regions.

[0107] In the area between Cyan and Green (810), the blue pixel value decreases as it moves further away from Blue.

[0108] In the region between Magenta and Red (820), the blue pixel value decreases as it moves further away from Blue.

[0109] Accordingly, a display device according to one embodiment of the present invention performs data processing when the current pixel's Hue value belongs to the aforementioned target area or when the current pixel's Hue value is farther from blue than the area representative Hue value.

[0110] Here, the region representative hue value refers to, for example, the representative hue value obtained through local pixel analysis.

[0111] In other words, it refers to a value representing the local area to be analyzed, such as the average or median of the Hue values ​​of multiple pixels. The size of the local analysis area may be pre-set, for example, but it is not necessarily limited to this.

[0112] Meanwhile, the reason for performing local pixel analysis is that when humans observe an image, they look globally, but they also perceive detailed expressions by viewing locally (small areas).

[0113] Here, data processing means designing it so that when the angular distance from the area representative hull value is large, it moves further away from blue, and when the angular distance from the area representative hull value is small, it moves slightly away from blue.

[0114] The reason for designing it this way is that even if Magenta moves further toward Red, the perceptual difference in contrast between them is small. Similarly, even if Cyan moves further toward Green, the perceptual difference in contrast between them is small.

[0115] Furthermore, the design should minimize movement when the difference from the region's representative hue value is small, because there are no high-contrast colors. This takes into account the risk that allowing significant movement in situations with low color contrast could result in color transitions within the target area being visible globally.

[0116] FIG. 9 illustrates a display device in which a blue light reduction mode is executed according to an embodiment of the present invention.

[0117] FIG. 9(a) shows a screen before the blue light reduction mode is executed, whereas FIG. 9(b) shows a screen after the display device according to an embodiment of the present invention has executed the blue light reduction mode.

[0118] Unlike in Fig. 1 (b), in Fig. 9 (b), there is no degradation in image quality due to color degradation that occurs throughout the image. Therefore, there is an advantage in that the user cannot easily perceive the difference between before and after the blue light is activated.

[0119] FIG. 10 is a histogram illustrating the distribution of blue pixel values ​​of a display device in which a blue light reduction mode is executed, according to an embodiment of the present invention.

[0120] As shown in FIG. 10, when comparing the graph (1020) of blue pixels in the input image data with the graph (1010) of blue pixels in the output image data according to the blue light reduction mode execution, it can be seen that although the number of blue pixels has decreased, the overall pattern of the graph is similar. Therefore, there is an advantage in that the user cannot easily perceive the degradation of image quality due to the blue light reduction mode execution.

[0121] Also, FIG. 11 is a flowchart illustrating a control method for a display device according to an embodiment of the present invention. Those skilled in the art may also interpret FIG. 11 by referring to the preceding drawings.

[0122] As illustrated in FIG. 11, a display device according to one embodiment of the present invention first performs a blue light reduction function (S1110) and can receive image data (S1120).

[0123] Furthermore, the display device compresses the range of brightness (V) and saturation (S) that are applied to all of the received image data (S1130). An embodiment related to this has been described previously in FIGS. 4 and FIGS. 5.

[0124] Additionally, the display device adjusts the brightness value in the first area of ​​the received image data (S1140). An embodiment related to this has been described previously in FIG. 6.

[0125] Furthermore, the display device adjusts the saturation value in a second area within the received image data (S1150). An embodiment related to this has been described previously in FIG. 7.

[0126] Then, the display device adjusts the color value (H) in a third region within the received image data (S1160). An embodiment related to this has been described previously in FIG. 8. In particular, the third region mentioned in step S1160 includes, for example, at least one of a first range between Cyan and Green or a second range between Magenta and Red in the HSV color space.

[0127] More specifically, for example, the aforementioned step S1130 is designed to increase the degree of brightness compression as the overall brightness of the received image data becomes darker, and to decrease the degree of brightness compression as the overall brightness of the received image data becomes brighter.

[0128] For example, the aforementioned step S1130 further includes a step of analyzing the saturation distribution of the received image data and a step of changing the degree of compression of the saturation according to the analysis result.

[0129] More specifically, for example, the aforementioned step S1130 further includes a step of reducing the degree of compression of saturation when the saturation distribution of the received image data is greater than or equal to a preset threshold value for each region, and a step of increasing the degree of compression of saturation when the saturation distribution of the received image data is less than a preset threshold value for each region.

[0130] Those skilled in the art to which the present invention pertains will understand that the above-described invention may be implemented in other specific forms without altering its technical concept or essential features.

[0131] Additionally, the methods described herein may be implemented at least partially using one or more computer programs or components. These components may be provided as a series of computer instructions via a computer-readable or machine-readable medium including volatile and non-volatile memory. The instructions may be provided as software or firmware and may be implemented wholly or partially in hardware configurations such as ASICs, FPGAs, DSPs, or other similar devices. The instructions may be configured to be executed by one or more processors or other hardware configurations, which perform or are capable of performing all or part of the methods and procedures disclosed herein when executing the series of computer instructions.

[0132] Therefore, the embodiments described above should be understood as illustrative in all respects and not limiting. The scope of the invention is defined by the claims set forth below rather than by the detailed description above, and all modifications or variations derived from the meaning and scope of the claims and equivalent concepts thereof should be interpreted as being included within the scope of the invention. Explanation of the symbols

[0133] 300: Display device 310: Global Data Processing Unit 311: Value Compression Section 312: Saturation Compression Section 320: Local Data Processing Unit 321: Value Adjustment Section 322: Saturation Adjustment Section 323: Target Hue Area Processing Unit

Claims

Claim 1 A method for controlling a display device, comprising: a step of executing a blue light reduction function; a step of receiving image data; a step of compressing the range of brightness (V) and saturation (S) that apply to all of the received image data; a step of adjusting a brightness value in a first region within the received image data; a step of adjusting a saturation value in a second region within the received image data; and a step of adjusting a color value (H) in a third region within the received image data. Claim 2 A control method for a display device according to claim 1, wherein the compression step increases the degree of compression of brightness as the overall brightness of the received image data becomes darker. Claim 3 A control method for a display device according to claim 1, wherein the compression step increases the degree of brightness compression as the overall brightness of the received image data becomes brighter. Claim 4 A control method for a display device according to claim 1, wherein the compression step further comprises: a step of analyzing the saturation distribution of the received image data; and a step of changing the degree of compression of the saturation according to the analysis result. Claim 5 A control method for a display device according to claim 4, wherein the changing step further comprises: a step of reducing the degree of compression of saturation when the saturation distribution of the received image data is greater than or equal to a preset threshold value for each region; and a step of increasing the degree of compression of saturation when the saturation distribution of the received image data is less than a preset threshold value for each region. Claim 6 A method for controlling a display device according to claim 1, wherein the third region comprises at least one of a first range between Cyan and Green or a second range between Magenta and Red in the HSV color space. Claim 7 A display device comprising: a receiving module for receiving image data; and a controller for executing a blue light reduction function, compressing the range of brightness (V) and saturation (S) that apply to all of the received image data, adjusting a brightness value in a first area within the received image data, adjusting a saturation value in a second area within the received image data, and adjusting a color value (H) in a third area within the received image data. Claim 8 A display device according to claim 7, wherein the controller increases the degree of brightness compression as the overall brightness of the received image data becomes darker. Claim 9 A display device according to claim 7, wherein the controller reduces the degree of brightness compression as the overall brightness of the received image data becomes brighter. Claim 10 A display device according to claim 7, wherein the controller analyzes the saturation distribution of the received image data and changes the degree of compression of the saturation according to the analysis result. Claim 11 A display device according to claim 10, wherein the controller reduces the degree of compression of saturation when the saturation distribution of the received image data is greater than or equal to a preset threshold value for each region, and increases the degree of compression of saturation when the saturation distribution of the received image data is less than a preset threshold value for each region. Claim 12 A method for controlling a display device according to claim 7, wherein the third region comprises at least one of a first range between Cyan and Green or a second range between Magenta and Red in HSV color space.

Images