KR102076506B1 - Apparatus and method for controlling brightness of display based on eye tracking - Google Patents

Abstract

The present invention relates to a technology for controlling brightness of each area of a display based on gaze tracking. In order to control the brightness of each area, a dimming control device according to an embodiment includes a view sensor for detecting a user's viewpoint on a display screen, and And a dimming control unit configured to control a brightness of a non-viewing area, which is an area other than the viewing area, based on a change of the viewing angle based on a change in the viewing angle based on a change in the viewing angle. Can be.

Description

Apparatus and method for adjusting brightness by area of display based on eye tracking {APPARATUS AND METHOD FOR CONTROLLING BRIGHTNESS OF DISPLAY BASED ON EYE TRACKING}

The present invention relates to a brightness control method for each area of a display, and more particularly, to a technology for controlling brightness for each area of a display based on eye tracking.

Currently, the display field is progressing toward realizing high resolution and high scanning performance, from small displays such as smart phones to large displays such as TVs.

However, high power consumption is required to implement high-performance displays, and high power consumption requires high energy consumption and increased battery life of portable devices.

That is, in the display field, efforts are being made to develop a technology that can reduce power consumption of a display while maintaining high performance.

Specifically, the LCD display includes a backlight for irradiating light to each pixel, and power consumption used in the backlight occupies the largest portion of the total power consumption.

Therefore, in order to reduce power consumption, the LCD display uses a local dimming technology that controls the light intensity of the backlight light source for each backlight block.

On the other hand, since the OLED display emits each pixel, power consumption varies according to the image, and power consumption increases as the average picture level (APL) increases.

To solve this problem, the OLED display senses the ambient illumination and applies an automatic brightness control technology that reduces the power consumption by showing a high brightness screen in bright illumination and a low brightness screen in dark illumination.

However, the above-described techniques have a problem that a user may perceive a change in brightness of a screen controlled to reduce power consumption, which may cause inconvenience to a user of the display.

Korean Patent No. 10-1634154, "Selective backlighting of display based on eye tracking" Korean Laid-Open Patent Publication No. 10-2016-0109443, "Display apparatus and method using eye tracking"

The present invention is to provide a technology that can control the brightness of the screen in a state in which the user does not recognize the change in brightness by step by adjusting the brightness of the area other than the viewpoint area.

In addition, the present invention is to provide a technology that can improve the life and battery life of the display device and minimize the power consumption by controlling the brightness of the screen.

In addition, the present invention is intended to minimize the power consumption without deteriorating the quality of the image that the user feels.

An apparatus for dimming control according to an embodiment of the present invention includes a viewpoint detection unit for detecting a viewpoint of a user on a display screen, and a viewpoint region determination unit for determining a viewpoint region based on a viewing angle of a user formed around the detected viewpoint. And a dimming controller configured to gradually control brightness of a non-viewing area, which is an area other than the viewing area, based on the change of the viewing angle.

According to one side, the viewing area determiner may determine a region in which the viewing angle is formed within a range of a reference angle with respect to the detected viewpoint as the viewing area.

According to one side, the dimming controller may control the brightness of the non-viewing area in stages without controlling the brightness of the viewing area.

According to one side, the dimming controller may control the brightness of the plurality of concentric circles formed in accordance with the change of the viewing angle around the detected viewpoint in stages.

According to one side, the dimming controller may form concentric circles as non-viewing regions whenever the viewing angle for determining the viewing region increases by a unit angle.

According to one side, the dimming control unit may reduce the lightness of the non-view area by applying a ratio to the size of the increasing unit angle.

According to one side, the dimming control unit may reduce the lightness of the concentric circles formed as the viewing angle increases by applying any one of the ratios included in the range of 0.3% to 0.9%.

The dimming control method according to an embodiment of the present invention comprises the steps of detecting the user's viewpoint on the display screen by the viewpoint detector and a viewpoint region based on the viewing angle of the user formed around the viewpoint detected by the viewpoint region determiner. And determining, by the dimming control unit, brightness of a non-view area, which is an area other than the view area, based on the change of the viewing angle.

According to one side, the determining of the viewing area may determine a region in which the viewing angle is formed within a range of a reference angle with respect to the viewing point detected by the previous viewing area determiner.

According to one side, the step of controlling the brightness of the non-viewing region step by step may control the brightness of the plurality of concentric circles formed in accordance with the change in the viewing angle around the time point detected by the dimming controller.

According to one side, in the step of controlling the brightness of the non-viewing region step by step the dimming control unit may form the concentric circle regions as the non-viewing region each time the viewing angle for determining the view region increases by a unit angle.

According to one side, the step of controlling the brightness of the non-viewing region in the step of any one of the ratio of the lightness (lightness) of the concentric circles formed in accordance with the increase in the viewing angle in the dimming control unit in the range of 0.3% to 0.9% It can be reduced step by step.

According to an embodiment, the brightness of the screen may be controlled in a state where the user does not recognize the change in brightness by adjusting the brightness of an area other than the viewpoint area in stages.

According to an embodiment, the lifespan and battery life of the display device may be improved by controlling the brightness of the screen.

According to an embodiment, the power consumption may be minimized without degrading the quality of the image experienced by the user.

1 is a diagram illustrating a dimming control apparatus according to an embodiment.
2A to 2C are diagrams illustrating an example of gradually adjusting brightness of a non-view area in a dimming control device according to an embodiment.
3A to 3B are diagrams illustrating an example of determining a view area in a dimming control apparatus according to an embodiment.
4A to 4D are diagrams illustrating an experimental process of deriving a brightness reduction ratio in order to control brightness in a dimming control apparatus according to an embodiment.
5A to 5M are diagrams illustrating an experimental process of deriving a brightness reduction ratio for each image in order to control brightness in a dimming control apparatus according to an embodiment.
6 illustrates a dimming control method according to an embodiment.

Hereinafter, various embodiments of the present disclosure will be described with reference to the accompanying drawings.

The examples and terms used therein are not intended to limit the techniques described in this document to specific embodiments, but should be understood to include various modifications, equivalents, and / or substitutes of the embodiments.

In the following description of the various embodiments, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

In addition, terms to be described below are terms defined in consideration of functions in various embodiments, and may vary according to a user's or operator's intention or custom. Therefore, the definition should be made based on the contents throughout the specification.

In connection with the description of the drawings, similar reference numerals may be used for similar components.

Singular expressions may include plural expressions unless the context clearly indicates otherwise.

In this document, expressions such as "A or B" or "at least one of A and / or B" may include all possible combinations of items listed together.

Expressions such as "first," "second," "first," or "second," etc. may modify the components in any order or in importance, to distinguish one component from another. Used only and do not limit the components.

When any (eg first) component is said to be "(functionally or communicatively)" or "connected" to another (eg second) component, a component is said other configuration. It may be directly connected to the element or through another component (eg, a third component).

As used herein, “configured to” is modified to have the ability to “fit,” “fit,” “to,” for example, in hardware or software. Can be used interchangeably with "made to", "doing", or "designed to".

In some situations, the expression "device configured to" may mean that the device "can" along with other devices or components.

For example, the phrase “processor configured (or configured to) perform A, B, and C” may be executed by executing a dedicated processor (eg, an embedded processor) to perform the operation, or one or more software programs stored in a memory device. It may mean a general purpose processor (eg, a CPU or an application processor) capable of performing the corresponding operations.

In addition, the term 'or' means inclusive or 'inclusive or' rather than 'exclusive or'.

In other words, unless stated otherwise or unclear from the context, the expression 'x uses a or b' means any one of natural inclusive permutations.

In the above-described specific embodiments, the components included in the invention are expressed in the singular or plural according to the specific embodiments presented.

However, the singular or plural expressions are selected to suit the circumstances presented for convenience of description, and the above-described embodiments are not limited to the singular or plural elements, and the singular or plural elements may be composed of the singular or the plural. However, even a component expressed in the singular may be configured in plural.

Meanwhile, in the description of the present invention, specific embodiments have been described, but various modifications may be made without departing from the scope of the technical idea that the various embodiments include.

Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined by the claims below and equivalents thereof.

1 is a diagram illustrating a dimming control apparatus according to an embodiment.

Referring to FIG. 1, the dimming control apparatus 100 according to an embodiment may control brightness of a screen in a state where a user does not recognize a change in brightness by gradually adjusting brightness of an area other than the viewpoint area.

To this end, the dimming control apparatus 100 may include a view sensor 110, a view area determiner 120, and a dimming controller 130.

In detail, the view sensor 110 according to an embodiment may detect the user's view on the display screen.

That is, the viewpoint detecting unit 110 may track the viewpoints of at least one user and calculate a viewpoint position of a user staring at a screen displayed on the display.

For example, the viewpoint sensor 110 may collect motion information of the user's viewpoint by using various types of sensors or a camera, and detect the position of the user's viewpoint by using the collected motion information. In detail, the view sensor 110 may detect a user's view by any one of a video analysis method, a contact lens method, and a sensor attachment method.

More specifically, the video analysis method may detect the movement of the pupil through real-time analysis of the camera image photographed using the camera and calculate the position of the viewpoint based on the fixed position reflected by the cornea.

In addition, the contact lens method may use the reflected light of the mirror-embedded contact lens, the magnetic field of the coil-embedded contact lens, etc., and the method is inferior in convenience and high in accuracy.

In addition, the sensor attachment method may use an electric field according to the movement of the eye by attaching a sensor around the eye.

However, the method of detecting the viewpoint position in the present invention is not limited to the above-described viewpoint detection scheme, and various methods and algorithms may be applied to calculate the viewpoint position of the user.

Next, the view area determiner 120 according to an embodiment may determine a view area based on the viewing angle of the user formed around the detected view point.

Preferably, the viewpoint region determiner 120 may determine a region where a viewing angle is formed within a reference angle with respect to the detected viewpoint as the viewpoint region.

For example, the reference angle may be 10 °, and the viewing area determiner 120 may determine an area where a viewing angle is formed within a range of 10 ° as the viewing area. Hereinafter, although the reference angle is set to 10 ° in the present specification, this may be variously changed as an example.

In other words, the viewpoint area determiner 120 determines a circle-shaped region formed when the user's viewing angle is 10 ° based on the viewpoint of the user sensed by the viewpoint detector 110 as the viewpoint area. Can be.

A process of determining the view area by the view area determiner 120 according to an embodiment will be described in detail with reference to FIGS. 3A through 3B.

Next, the dimming control unit 130 according to an embodiment may control the brightness of the non-viewing area, which is an area other than the viewing area, based on the change in the viewing angle.

According to one side, the dimming controller 130 may control the brightness of the non-viewing region in stages without controlling the brightness of the viewing region.

In other words, the brightness of the viewpoint region is not controlled by the dimming controller 130, and the brightness of the region corresponding to the viewpoint region in the original image may be output as it is.

According to one side, the dimming control unit 130 may control the brightness of the plurality of concentric circle regions formed in accordance with the change of the viewing angle around the detected viewpoint.

In addition, the dimming controller 130 may form concentric circles whenever the viewing angle for determining the viewing area increases by a unit angle.

In one example, the unit angle may be 1 °. In this specification, the unit angle is set to 1 ° but this may be variously changed as an example. In particular, it may be changed in various forms such as a case where the decrease rate of brightness and the non-view area are reduced by the same rate.

The dimming control unit 130 may form a plurality of regions that form concentric circles with a circular view area formed when the viewing angle is 10 ° around the detected user's view point whenever the user's viewing angle increases by 1 °.

For example, when the viewing angle of the user is 11 °, the viewing angle is 12 °, and the viewing angle is 13 °, the concentric circles may be formed, respectively.

In addition, the dimming controller 130 may adjust brightness of the concentric circle areas corresponding to the non-view area, which is an area other than the view area formed when the viewing angle of the user is 10 °, among the plurality of concentric circle areas formed with the center point of the user as the center point. Can be adjusted step by step.

On the other hand, the dimming controller 130 may gradually adjust the brightness indicating the user's perceived brightness in order to gradually adjust the brightness of the concentric circles corresponding to the non-viewing area.

For reference, the lightness used in the present specification may be interpreted as lightness defined in CIE 1976 L * a * b * color space.

For example, the brightness values of the concentric circles corresponding to the non-viewing region may be derived through one or more experimental methods of a double stimulus method and a two-alternative forced choice method.

In addition, the ratio of the brightness value reduced in the display screen may be derived through Equations 1 to 4 below.

[Equation 1]

[Equation 2]

[Equation 3]

[Equation 4]

는 각 픽셀별 명도값을 의미한다.More specifically, in Equation 1 to Equation 4, C means image data of any one pixel among the red pixel R, the green pixel G, and the blue pixel B,

Denotes a brightness value for each pixel.

That is, the present invention can calculate the brightness value for each pixel through the above equations (1) to (4) and apply the reduction ratio of the brightness based on the calculated brightness value, RGB data to the reduction ratio of the reduced brightness You can modify the brightness of the display screen by inverting.

That is, the dimming controller 130 may reduce the lightness of the non-viewing region by applying a ratio corresponding to the size of the increasing unit angle.

Preferably, the dimming control unit 130 may gradually reduce the lightness of the concentric circles formed as the viewing angle is increased by applying any one of the ratios included in the range of 0.3% to 0.9%. .

An operation of gradually adjusting the brightness of the concentric circles corresponding to the non-viewing area in the dimming control unit 130 according to an embodiment will be described in more detail with reference to FIGS. 2A to 2C.

According to one side, the dimming controller 130 may gradually adjust the gray level of the concentric circles in order to adjust the brightness of the concentric circles corresponding to the non-viewing region in steps.

That is, according to the present invention, the brightness of the screen may be controlled in a state in which the user does not recognize the change in brightness by gradually adjusting the brightness of areas other than the viewpoint area.

In addition, the present invention can improve the lifespan and battery life of the display device through the brightness control of the screen and can minimize the power consumption without deterioration of the image quality that the user feels.

2A to 2C are diagrams illustrating an example of gradually adjusting brightness of a non-view area in a dimming control apparatus according to an embodiment.

In other words, FIGS. 2A to 2C are diagrams for describing an exemplary embodiment in which the brightness of the non-viewing region is adjusted step by step in the dimming control apparatus 100 according to the exemplary embodiment described with reference to FIG. 1. Descriptions overlapping with the descriptions of FIG. 1 will be omitted.

Referring to FIGS. 2A to 2C, the view area determiner 120 of FIG. 1 uses a view point as a center point of the user view detected by the view sensor 110 to determine an area formed when the user's viewing angle is 10 °. 210).

For example, the viewpoint of the user may be a center point of the viewpoint area 210 and may be an area formed when the user's viewing angle is 1 °. In addition, the viewpoint area 210 may be output at the same brightness as that of the original image without decreasing the brightness.

Next, the dimming controller 130 of FIG. 1 may reduce the brightness of an area excluding the view area 210 in the concentric circle 220 formed when the user's viewing angle is 11 ° compared to the original image by 0.3%. .

Next, the dimming control unit 130 contrasts the brightness of an area excluding the concentric circle area 220 formed when the viewing angle is 11 ° from the concentric circle area 230 formed when the user's viewing angle is 12 ° compared with the original image. Can be reduced by%.

That is, the dimming control apparatus according to the embodiment decreases the brightness by 0.3% step by step every time the user's viewing angle increases by 1 ° around the viewing area, thereby reducing the brightness of the screen without the user being aware of the change in brightness. By controlling, the power consumption can be minimized without degrading the quality of the image felt by the user.

In the embodiments described with reference to FIGS. 2A to 2C, an example in which the brightness of the non-viewing region is gradually decreased by 0.3% each time the viewing angle increases by 1 ° is described. However, the present invention is not limited thereto, and the present invention is not limited thereto. The reduction ratio of any one of the ratios contained in the range of 0.9% can be applied.

In addition, the concentric circles corresponding to the non-viewing area are not formed only when the viewing angles are 11 ° and 12 °, but a plurality of concentric circle areas may be formed in accordance with the change of the viewing angle of the user in the display screen.

3A to 3B are diagrams illustrating an example of determining a view area in a dimming control apparatus according to an embodiment.

3A-3B, reference numeral 310 shows the distribution of cone and rod cells, and reference numeral 320 shows a human field of view.

Specifically, as shown by reference numeral 310, there are rod cells recognizing brightness and cone cells recognizing color, and each cell is unevenly distributed according to the location. It is.

More specifically, the cone cells (Cone cells) are concentrated in the area between -1 ° ~ 1 ° with respect to the macula (Fovea), the more away from the area centered on the fovea (Cone cells) ) Decreases sharply.

Also, rod cells are most distributed in the area between -20 ° and + 20 °° centered on the fovea, and as the distance from the fovea centers, the rod cells ( The number of rod cells decreases.

That is, through the above-described biostructure features, when the change in brightness occurs in an area far from the user's point of view, it can be seen that it is difficult for the user to perceive the change in brightness described above.

On the other hand, as shown by reference numeral 320, the human vision is a center of gravity (Foveal vision 321) formed in an area of about 2 ° viewing angle around the viewpoint, a sub-center formed in an area of about 10 ° viewing angle The vision may be divided into a vision vision 322 and a peripheral vision 323 which is another area.

In detail, the central vision 321 is an area where an image of an object is clearly visible, the subcentric vision 322 is an area where a clearer image is visible than the peripheral vision 323, and the peripheral vision 323 has a very high resolution for an image. It is low and sensitive to movement.

That is, the dimming control device according to an embodiment of the present invention corresponds to a viewing angle of 10 ° including the central vision 321 and the subfocal vision 322, which are sensitive to changes in an image in consideration of the above-described biostructure. The area may be determined as the viewpoint area.

In addition, the brightness of the determined view area may be maintained as it is, and the brightness of the display screen may be controlled in a state where the user does not recognize the change in brightness by controlling the brightness of the non-view area, which is an area other than the view area.

4A to 4D are diagrams illustrating an experimental process of deriving a brightness reduction ratio in order to control brightness in a dimming control apparatus according to an embodiment.

4A to 4D, reference numeral 410 shows the entire experimental procedure for deriving the brightness reduction ratio, reference numeral 420 shows the original image provided by the user during the experimental procedure, and reference numeral 430 shows the brightness adjustment. The corrected image is shown, and reference numeral 440 shows the result of the experiment for deriving the brightness reduction ratio.

For example, the experimental procedure of the reference numeral 410 may be performed through a double stimulus method and a two-alternative forced choice method.

Specifically, as shown at 410, the experimental procedure provides the user with the original image 420 at the timing of any of the timings 401 and 403, and the corrected image 430 at the other timing. ) Can be provided to the user.

For example, each of the original image 420 and the corrected image 430 provided to the user may be exposed to the user for about 8 seconds, and the timing 401 and the reference 403 of the reference numeral 401 may be used to improve the accuracy of the experimental results. In reference numeral 402, which is an intermediate timing of the timing, an image of mid gray may be exposed to the user for about 3 seconds.

In addition, the center of the original image 420 and the correction image 430 provided to the user may include a red cross in which the user's viewpoint stays, and the corrected image 430 has a viewing angle of 10 ° around the red cross. The brightness of the area to be maintained is maintained to the brightness of the original image, and the brightness of the area outside the area where the user's viewing angle is 10 ° may be decreased step by step.

For example, the brightness of the corrected image 430 provided to the user is in the ratio of any one of 0.1%, 0.4%, 0.7%, and 1.0% every time the viewing angle increases by 1 ° from the area where the viewing angle becomes 10 °. It can be reduced in stages by the set reduction ratio.

In addition, the experiment process of the reference numeral 410 may control to select the original image 420 of the image exposed to the user at the timing of the reference numeral 404.

In other words, at the timing of the reference numeral 404, the user may be encouraged to vote at the timing at which the user viewed the image determined to be the original image 420 among the images viewed at the timings of the reference numerals 401 and 403.

In this case, when the user does not notice the change in brightness between the original image 420 and the correction image 430, the user randomly selects one of the two, so the correct answer rate converges to 50%. Can converge to 100%.

In addition, the threshold at which the difference starts to be felt can be selected as the point at which the answer rate is 75%.

On the other hand, the experiment process of the reference numerals 401 to 404 may be repeatedly performed a predetermined number of times, and the rate of decrease of brightness in the modified image 430 may be changed each time the experiment process is repeated.

 In addition, if the user does not stare at the red cross provided in the center of the original image 420 and the corrected image 430 during the experiment process, the user may output a warning sound. By excluding, the accuracy of the experimental results can be improved.

On the other hand, looking at the results of the experiment shown in the reference numeral 440, the reduction ratio corresponding to the threshold (Threshold) that the user starts to recognize the difference between the original image 420 and the correction image 430 is about 0.63% appear.

In other words, the brightness of the area where the field of view becomes 10 ° around the user's point of view maintains the brightness of the original image, and when the field of view increases by 1 ° from the area where the field of view becomes 10 °, the brightness decreases by 0.63% step by step. In this case, the user was not aware of the change in brightness, and in this case, the power consumption was reduced by about 26.6%.

5A to 5M are diagrams illustrating an experimental process of deriving a brightness reduction ratio for each image in order to control brightness in a dimming control apparatus according to an embodiment.

Since the experimental process of FIGS. 5A to 5M is performed by the same process as the process described with reference to FIGS. 4A to 4D, a description overlapping with the contents described with reference to FIGS. 4A to 4D will be described later. Will be omitted.

Specifically, referring to FIGS. 5A to 5M, reference numeral 511 illustrates a forest image provided to the user, reference numeral 512 illustrates a sea image provided to the user, and reference numeral 513 denotes a deer image provided to the user. The reference numeral 514 illustrates a field image provided to the user.

Further, reference numeral 521 denotes an average brightness of the forest image, reference 522 denotes an average brightness of the sea image, reference 523 denotes an average brightness of the deer image, and reference numeral 524 denotes an average brightness of the sea image. It is shown.

Reference numeral 531 denotes an experimental result for the forest image, reference numeral 532 denotes an experimental result for the sea image, reference numeral 533 denotes an experimental result for the deer image, and reference numeral 534 for a field image. Experimental results are shown.

On the other hand, reference numeral 540 denotes an experimental result obtained by combining the experimental results shown in reference numerals 531 to 534.

More specifically, looking at the experimental results shown at 540, in the forest image, the rate of decrease of the threshold at which the user starts to recognize the difference between the original image and the modified image is about 0.45%, and the average Brightness was 67%.

In addition, in the case of the sea image, the reduction rate of the critical point where the user starts to recognize the difference between the original image and the corrected image is about 0.29%, and the average brightness is 61%.

In addition, in the case of a deer image, the decrease rate of the critical point where the user starts to recognize the difference between the original image and the corrected image is about 0.63%, and the average brightness is 52%.

In addition, in the field image, the reduction rate of the critical point where the user starts to recognize the difference between the original image and the corrected image is about 0.89%, and the average brightness is 48%.

That is, according to the above experimental results, the brightness of the original image is maintained in the area where the viewing angle is 10 ° around the user's viewpoint, and the brightness is increased whenever the viewing angle increases by 1 ° from the area where the viewing angle is 10 °. In the case of a step-down reduction of any one of the ratios included in the range of 0.3% to 0.9%, the user was found not to notice the change in brightness.

In addition, when the image displayed on the display screen is a bright image, the recognition rate of the user decreases when the reduction ratio is set lower.

6 illustrates a dimming control method according to an embodiment.

In other words, FIG. 6 is a view illustrating a dimming control method using the dimming control device 100 according to an embodiment described with reference to FIG. 1, and the descriptions of FIG. The description will be omitted.

Referring to FIG. 6, in operation 610, the dimming control method may detect a user's viewpoint on a display screen by the viewpoint detector.

Next, in step 620, the dimming control method according to the exemplary embodiment may determine a viewpoint area based on a viewing angle of a user formed around the viewpoint detected by the viewpoint area determiner.

According to one side, in step 620, the dimming control method according to an embodiment may determine a region formed when the viewing angle is 10 ° with respect to the viewpoint detected by the viewpoint region determiner as the viewpoint region.

Next, in step 630, the dimming control method according to an embodiment may control the brightness of the non-viewing area, which is an area other than the viewing area, in the dimming control unit based on the change of the viewing angle.

According to one side, the dimming control method according to an embodiment in step 630 can control the brightness of the plurality of concentric circles formed in accordance with the change in the viewing angle around the time point detected by the dimming controller.

According to one side, the dimming control method according to an embodiment in step 630 may form concentric circles each time the viewing angle for determining the view area in the dimming controller increases by 1 °.

In operation 630, the dimming control method according to the exemplary embodiment applies a ratio of any one of the ratios included in the range of 0.3% to 0.9% of lightness of the concentric circles formed as the viewing angle is increased in the dimming controller. Can be reduced step by step.

As a result, according to the present invention, the brightness of the screen may be controlled in a state in which the user does not recognize the change in brightness by adjusting the brightness of areas other than the viewpoint area in stages.

In addition, by using the present invention, the lifespan and battery life of the display apparatus may be improved by controlling the brightness of the screen, and power consumption may be minimized without degrading the quality of the image felt by the user.

In addition, the present invention can be applied to a self-luminous display such as an OLED display, a micro-LED display (how each pixel emits light directly), and based on this, a VR (Virtual Reality) device and an AR (Augmented Reality) device Can also be used.

The apparatus described above may be implemented as a hardware component, a software component, and / or a combination of hardware components and software components. For example, the devices and components described in the embodiments may include, for example, processors, controllers, arithmetic logic units (ALUs), digital signal processors, microcomputers, field programmable arrays (FPAs), It may be implemented using one or more general purpose or special purpose computers, such as a programmable logic unit (PLU), microprocessor, or any other device capable of executing and responding to instructions. The processing device may execute an operating system (OS) and one or more software applications running on the operating system. The processing device may also access, store, manipulate, process, and generate data in response to the execution of the software. For the convenience of understanding, the processing apparatus may be described as one used, but those skilled in the art will appreciate that the processing apparatus includes a plurality of processing elements and / or a plurality of types of processing elements. It can be seen that it may include. For example, the processing device may include a plurality of processors or one processor and one controller. In addition, other processing configurations are possible, such as parallel processors.

The software may include a computer program, code, instructions, or a combination of one or more of the above, and may configure the processing device to operate as desired, or process independently or collectively. You can command the device. Software and / or data may be any type of machine, component, physical device, virtual equipment, computer storage medium or device in order to be interpreted by or to provide instructions or data to the processing device. Or may be permanently or temporarily embodied in a signal wave to be transmitted.

The software may be distributed over networked computer systems so that they may be stored or executed in a distributed manner. Software and data may be stored on one or more computer readable recording media.

The method according to the embodiment may be embodied in the form of program instructions that can be executed by various computer means and recorded in a computer readable medium. The computer readable medium may include program instructions, data files, data structures, and the like, alone or in combination. The program instructions recorded on the media may be those specially designed and constructed for the purposes of the embodiments, or they may be of the kind well-known and available to those having skill in the computer software arts. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tape, optical media such as CD-ROMs, DVDs, and magnetic disks, such as floppy disks. Magneto-optical media, and hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like. Examples of program instructions include not only machine code generated by a compiler, but also high-level language code that can be executed by a computer using an interpreter or the like. The hardware device described above may be configured to operate as one or more software modules to perform the operations of the embodiments, and vice versa.

100: dimming control device 110: view point tracking unit
120: viewpoint region determination unit 130: dimming control unit

Claims (12)

In the dimming control device,
A viewpoint detector for detecting a viewpoint of a user on a display screen;
A view area determiner which determines a view area based on a viewing angle of the user formed around the detected view point;
A dimming controller configured to gradually control brightness of a non-viewing area, which is an area other than the viewing area, based on the change of the viewing angle;
The dimming control unit
By setting a threshold at which the user starts to recognize the difference between the original image and the corrected image, and gradually controlling the brightness of the non-view area at a reduction ratio corresponding to the threshold.
Dimming control device. The method of claim 1,
The viewpoint area determiner
Determining an area in which the viewing angle is formed within a range of a reference angle based on the detected viewpoint as the viewpoint area
Dimming control device. The method of claim 1,
The dimming control unit
The brightness of the viewpoint region is not controlled, and the brightness of the viewpoint region is controlled step by step.
Dimming control device. The method of claim 1,
The dimming control unit
Stepwise control of the brightness of the plurality of concentric circles formed according to the change of the viewing angle around the detected viewpoint
Dimming control device. The method of claim 4, wherein
The dimming control unit
The concentric circles are formed as non-viewing regions whenever the viewing angle for determining the view-point region increases by a unit angle.
Dimming control device. The method of claim 5,
The dimming control unit
Reducing the lightness of the non-viewing region by applying a ratio to the size of the increasing unit angle
Dimming control device. The method of claim 4, wherein
The dimming control unit
The lightness of the concentric circles formed according to the increase of the viewing angle is gradually reduced by applying any one of the ratios included in the range of 0.3% to 0.9%.
Dimming control device. In the dimming control method,
Detecting a view of a user on a display screen by a view detecting unit;
Determining a view area based on a viewing angle of the user formed around the detected view point by a view area determiner;
Controlling the brightness of the non-viewing area, which is an area other than the viewing area, based on the change of the viewing angle in the dimming controller,
Stepwise controlling the brightness of the non-viewing region
By setting a threshold at which the user starts to recognize the difference between the original image and the corrected image, and gradually controlling the brightness of the non-view area at a reduction ratio corresponding to the threshold.
Dimming control method. The method of claim 8,
The determining of the view point area
The view area determiner determines an area in which the viewing angle is formed within a range of a reference angle based on the detected view point as the view area.
Dimming control method. The method of claim 8,
Stepwise controlling the brightness of the non-viewing region
The dimming controller is configured to control the brightness of the plurality of concentric circles formed in accordance with the change of the viewing angle based on the detected viewpoint.
Dimming control method. The method of claim 10,
Stepwise controlling the brightness of the non-viewing region
The dimming controller forms the concentric circles as non-viewing regions whenever the viewing angle for determining the view-point region increases by a unit angle.
Dimming control method. The method of claim 10,
Stepwise controlling the brightness of the non-viewing region
The dimming control unit gradually reduces the lightness of the concentric circles formed as the viewing angle is increased by applying any one of the ratios included in the range of 0.3% to 0.9%.
Dimming control method.

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