KR100590659B1 - Display Apparatus for Controlling Brightness According to Size of User's Pupil and Mobile Communication Terminal Therewith - Google Patents

Abstract

The present invention relates to a display device capable of adjusting brightness by sensing a pupil size, and a mobile communication terminal method and apparatus having the same.

The present invention provides a display device capable of automatically adjusting brightness, comprising: a camera unit for capturing an eye image of a user of the display device and transferring eye image data to a pupil size detector; A pupil size detector which analyzes the eye image data transmitted from the camera unit, calculates a ratio of a radius of a pupil and an iris (hereinafter referred to as a “pupillary size ratio”) and transmits the same to a display controller; Storing data about an average pupil size ratio and a brightness value of the display corresponding to the average pupil size ratio, and comparing the pupil size ratio received from the pupil size detector with the previously stored average pupil size ratio to determine the brightness of the display. A memory unit for storing a brightness adjustment program for performing a function of adjusting; A display controller configured to drive the brightness control program to transmit a brightness control signal for controlling the brightness of the display corresponding to the pupil size ratio obtained by the pupil size detector to a display; And a display configured to receive the brightness adjustment control signal from the display control unit and provide the user with the brightness of the display corresponding to the pupil size ratio. do.

According to the present invention, the display device detects a change in the pupil size of the user and automatically adjusts the brightness of the display according to the brightness of the user's surroundings, thereby automatically providing an optimal display brightness suitable for the user's eyes. have.

Pupil size, brightness control, display

Description

Display Apparatus for Controlling Brightness According to Size of User's Pupil and Mobile Communication Terminal Therewith}

Figure 1a is a view showing the pupil and the iris when the surrounding is moderate brightness,

1B is a view showing that the iris contracts when the surroundings are darker than normal brightness, and the pupils become larger;

Figure 1c is a view showing that the pupil is smaller because the iris is relaxed when the surroundings are brighter than normal brightness,

2 is a view showing the radius of the pupil and the iris for determining the change in the size of the pupil in accordance with an embodiment of the present invention,

3 is a block diagram briefly illustrating an internal configuration of a display device capable of adjusting brightness by detecting a pupil size according to an embodiment of the present invention;

4A is a graph illustrating finding a brightness value of a display corresponding to the detected pupil size ratio using a segment setting method;

4B is a graph illustrating finding a brightness value of a display corresponding to the detected pupil size ratio using linear interpolation;

5 is a block diagram schematically illustrating an internal configuration of a mobile communication terminal having a function of adjusting a display brightness by detecting a pupil size according to an exemplary embodiment of the present invention.

<Description of Symbols for Main Parts of Drawings>

300: camera unit 302: pupil size detector

304: memory unit 306: display control unit

308: Display

The present invention relates to a display device capable of adjusting brightness by sensing a pupil size and a mobile communication terminal having the same. More specifically, by automatically adjusting the brightness of the display by detecting a change in the pupil size according to the brightness of the surroundings, the optimal brightness is automatically minimized to minimize the fatigue of the eyes according to the surrounding brightness situation. A display device that can be provided and a mobile communication terminal having the same.

Conventional display devices, such as a monitor or TV, a liquid crystal (LCD) screen of a mobile communication terminal may have a fixed brightness from the beginning of manufacture, but the brightness of the display may be adjusted according to the user's convenience. Almost all of them.

However, display devices that can adjust the brightness of the display also have inconveniences in that the user must manually set the brightness of the display whenever the user wants the brightness that suits them.

Taking a TV screen as an example, if the lights in the room are turned off and the surroundings are darker than usual, the TV screen looks brighter and dazzles, so it is necessary to make the brightness of the TV screen darker. In this case, in order for the user to adjust the brightness of the TV screen to be darker, the user must manually set the brightness of the TV screen. Conversely, if the room's lights are turned on and the surroundings are brighter than usual, the TV screen looks darker and less visible, so it is necessary to adjust the brightness of the TV screen brighter. In this case, the user is inconvenient to set the brightness of the TV screen directly in order to adjust the brightness of the TV screen more brightly.

When the user looks at a display device that emits light of itself, such as a monitor, the brightness of the display device itself needs to be adjusted so that the brightness of the display device does not differ much from the surrounding brightness in order to minimize eye fatigue. In the conventional display device, there is an inconvenience that the user must adjust the brightness at that time according to the surrounding environment.

On the other hand, this inconvenience is particularly prominent in the mobile communication terminal, the mobile communication terminal has a large portability when using it, despite the need to adjust the screen brightness of the mobile communication terminal according to the large change in the brightness of the surroundings, accordingly, then There is an inconvenience that the user must adjust the brightness every time.

 In order to solve this problem, the present invention, by using the principle that the pupil of the human pupil is enlarged or reduced in accordance with the brightness of the surroundings, the display device detects a change in the pupil size of the user to match the brightness of the display around the user It is an object of the present invention to provide a display device capable of automatically providing an optimal display brightness for a user's eyes by automatically adjusting the brightness, and a mobile communication terminal having the same.

According to a first object of the present invention for achieving this object, in the display device capable of automatically adjusting the brightness, to perform the function of capturing the eye image of the user of the display device to deliver the eye image data to the pupil size detector Camera unit; A pupil size detector which analyzes the eye image data received from the camera unit, calculates a ratio of the radius of the pupil and the iris (hereinafter, referred to as the “pupillary size ratio”) and transmits it to the display controller; This function stores the data on the brightness value of the display corresponding to the average pupil size ratio and average pupil size ratio, and adjusts the brightness of the display by comparing the pupil size ratio received from the pupil size detector with the stored average pupil size ratio. A memory unit for storing a brightness adjusting program for performing the operation; A display control unit for driving a brightness control program to transmit a brightness control signal for controlling a brightness of a display corresponding to a pupil size ratio obtained from a pupil size detector to a display; And a display configured to receive a brightness control signal from a display controller and provide a brightness of a display corresponding to a pupil size ratio to a user.

According to a second object of the present invention, a function of capturing an eye image of a user of a mobile communication terminal and delivering eye image data to a pupil size detector in a mobile communication terminal having a display brightness adjustment function for automatically adjusting display brightness. Camera unit for performing; A pupil size detector which analyzes the eye image data transmitted from the camera unit, calculates a ratio of the radius of the pupil and the iris (hereinafter, referred to as the “pore size ratio”) and transmits it to the microprocessor; This function stores the data on the brightness value of the display corresponding to the average pupil size ratio and average pupil size ratio, and adjusts the brightness of the display by comparing the pupil size ratio received from the pupil size detector with the stored average pupil size ratio. A memory unit for storing a brightness adjusting program for performing the operation; A microprocessor which controls a camera unit and a pupil size detector, and transmits a brightness control signal for controlling a brightness of a display corresponding to a pupil size ratio obtained by the pupil size detector to a display unit by driving a brightness adjustment program; A display unit configured to receive a brightness control signal from a microprocessor and provide a brightness of a display corresponding to a pupil size ratio to a user; A key input unit having number and letter buttons and function buttons for function selection; And a transmitter / receiver configured to transmit and receive data between the mobile communication terminal and the mobile communication network under the control of a microprocessor. to provide.

According to a third object of the present invention, there is provided a method of automatically adjusting brightness of a display device, the method comprising: (a) capturing an eye image of a user of a display device and outputting eye image data; (b) analyzing the eye image data to obtain a ratio of the radius of the pupil and the iris (hereinafter referred to as “the pupil size ratio”); (c) comparing the pupil size ratio with a pre-stored average pupil size ratio; (d) determining a brightness value of the display device according to the comparison result; And (e) setting the brightness of the display device according to the determined brightness value of the display device.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are used as much as possible even if displayed on different drawings. In addition, in describing the present invention, when it is determined that the detailed description of the related well-known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

Human pupils are largely divided into pupils and irises. As the iris relaxes or contracts, the size of the pupil changes, thus controlling the amount of light that reaches the retina through the pupil. That is, the iris corresponds to the aperture of the camera. The relaxation and contraction of the iris is carried out by the sympathetic muscles and coccyx muscles in it, depending on the brightness of the surroundings, the iris contracts to receive more light when it is dark so that the pupils become larger and less light when it is bright. The iris relaxes, resulting in a smaller pupil. However, the outer boundary of the iris does not change when the iris relaxes or contracts.

1A to 1C are state diagrams illustrating the size of a pupil in a human eye according to the surrounding brightness.

1A shows the pupil 100 and iris 102 when the surroundings are of moderate brightness. The pupil 100 is different from the iris 102 and the boundaries of each other are distinguished.

FIG. 1B shows that the iris 102 contracts when the surroundings are darker than normal brightness, resulting in a larger pupil 100. FIG. 1C shows the pupils 100 being relaxed when the surroundings are brighter than normal brightness. ) Decreases. That is, the size ratio of the pupil 100 and the iris 102 is greatly changed according to the surrounding brightness.

In this way, the size of the pupil is relatively changed according to the brightness of the human surroundings, on the contrary, by grasping the change in the size of the pupil, it is possible to determine the relative light and dark degree of the surrounding.

On the other hand, in order to find out the change in the size of the pupil, a relative size ratio may be used by dividing the pupil and the iris region. The distinction between the pupil and the iris can be achieved by detecting the inner iris boundary corresponding to the boundary between the pupil and the iris, and the outer iris boundary corresponding to the sclera and the iris boundary. Boundary extraction within and outside the iris is achieved by determining the center and radius of the pupil and iris. Various techniques for finding an iris region are known, such as a method using a closed curve integral calculation, a method using a circular edge detector, a method using a Hough transform, a method using a template, and the like. The above methods use the assumption that the shape of the iris boundary is a circle, and that the pupil is darker than other areas. The commonly used iris region extraction is a method using a circular edge detector, which defines the largest change of the circumference as the boundary between the pupil and the iris by changing the center and radius.

2 is a view showing the radius of the pupil 200 and the iris 202 for determining the change in the size of the pupil in accordance with an embodiment of the present invention.

As seen above, the radius R of the iris 202 is constant, but if the brightness of the surroundings becomes brighter, the radius r of the pupil 200 becomes smaller, so the size ratio of the pupil 200 to the iris 202 (r / R) becomes smaller than usual.

In addition, when the surrounding brightness becomes dark, the radius r of the pupil 200 increases, so that the size ratio r / R of the pupil 200 to the iris 202 becomes larger than usual.

As such, by using the size ratio of the pupil of the display device user, the relative brightness change of the surroundings can be known and the brightness of the display suitable for the user can be found.

3 is a block diagram briefly illustrating an internal configuration of a display device capable of adjusting brightness by detecting a pupil size according to an exemplary embodiment of the present invention.

The camera unit 300 performs a function of capturing the eye image of the user, that is, the sclera, the pupil, and the iris under the control of the display controller, and transferring the image data to the pupil size detector 302. The camera unit 300 preferably uses a high performance camera including a zoom lens.

The pupil size detector 302 grasps the eye image data transmitted from the camera unit 300, obtains a ratio of the radius of the pupil and the iris (hereinafter referred to as the pupil size ratio), and transmits the image to the display controller 304. Here, the process of obtaining the pupil size ratio may include a method using the above-described closed curve integral calculation, a method using a circular edge detector, a method using a Hough transform, a method using a template, and the like.

The method of obtaining the pupil size ratio will be described in more detail as follows. First, the position of the pupil should be found. Since the pupil has a lower gray level value than the other parts, it can be found by extracting an edge by binarizing the eye image. The center of the pupil is extracted by applying a Hough transform based on the contour thus obtained. Based on the found center of the pupil, the difference between the brightness of the pixels in the line and the center of the pupil is compared to find the end points of the iris. To determine the center and diameter of the iris, the pupil and the center of the iris do not always exactly match, but use a feature that has a similar position. The radius of the iris is determined by comparing the difference between the gray level values of the pixels in a straight line at the center of the found pupil and finding both points where the change is large.

The memory unit 304 includes a program memory and a general memory. The program memory stores a brightness adjustment program that performs a function of adjusting the brightness of the display 308 by comparing the pupil size ratio obtained by the pupil size detector 302 with a previously stored average pupil size ratio. That is, the brightness control program causes the brightness of the display 308 to be brighter than the brightness of the current display when the newly detected pupil size ratio is smaller than the average pupil size ratio, so that the brightness of the display 308 is brighter. If the ratio is larger than the average pupil size ratio, the surrounding is darker, and thus the brightness of the display 308 is made darker than the brightness of the current display.

On the other hand, the general memory stores data on the average pupil size ratio and the pupil size ratio required for the scale adjustment described below and the brightness of the display 308 corresponding thereto.

The display controller 306 controls the camera unit 300 and the pupil size detector 302, and transmits a control signal for adjusting the brightness of the display 308 according to the detected pupil size ratio by driving a brightness adjusting program to the display. It performs the function.

The display 308 includes a monitor, a TV CRT, or a liquid crystal screen, and in the case of a liquid crystal screen, includes a backlight. The display controller 306 receives the control signal for adjusting the brightness and provides the brightness of the corresponding display 308.

Meanwhile, a process of adjusting the brightness of the display 308 by comparing the pupil size ratio obtained by the pupil size detector 302 with a previously stored average pupil size ratio will be described in detail as follows.

First of all, in order to perform display brightness adjustment according to the pupil size according to the present invention, a change in pupil size according to pupil size or brightness varies from person to person, and the optimal display brightness according to the surrounding brightness felt by the user also varies from person to person. It is necessary to store the pupil size ratio and the brightness of the display 308 corresponding thereto in advance in the memory unit 304. That is, the pupil size ratio of the user is detected in an environment of average brightness, and the user selects and stores the brightness value of the display 308 determined to be suitable for the ambient brightness at that time. The brightness adjustment program determines the brightness of the display 308 according to the detected pupil size ratio based on the stored average pupil size ratio to adjust the brightness. In addition, the average pupil size stored by the user and the brightness of the display 308 corresponding thereto may be arbitrarily deleted and changed by the user.

On the other hand, in order to more accurately determine the pupil size ratio and the brightness of the display 308 corresponding thereto, it is necessary to more closely adjust the scale of the pupil size ratio and the brightness value of the display 308 corresponding thereto. This allows the user to store more pupil size ratios and corresponding brightness values of the display 308 to make the scale more dense. In addition, there are various methods of finding the pupil size ratio detected in actual use and the brightness value of the display 308 corresponding thereto using data on the stored pupil size ratio and the brightness value of the display 308 corresponding thereto. There may be, among them, a method using interval setting and a method using interpolation may be applied.

4A is a graph illustrating finding a brightness value of a display corresponding to the detected pupil size ratio using a segment setting method.

When the user first saves the average pupil size ratio and the corresponding brightness value of the display, and also saves the pupil size ratio in the brighter and darker surroundings and the corresponding brightness values of the display, the brightness control program stores the stored data. By setting them in units of intervals, the brightness of the display that matches the detected pupil size ratio is found and the brightness of the display is adjusted. If the ambient brightness is bright and the pupil size ratio is small, the brightness value of the brighter display is required. The brightness value of the display with respect to the pupil size ratio will be inversely proportional to the graph.

4B is a graph illustrating finding a brightness value of a display corresponding to the pupil size ratio detected using linear interpolation.

Interpolation means that the shape of the function f (x) of the real variable x is unknown, but the value xi (i = 1,2,…, n) of two or more variables having any interval (regardless of equal or unequal interval). If the function value f (xi) is known, this means estimating the function value for any x in between. As a method used when estimating a value at an unobserved point from observations obtained by experiments or observations, there are linear interpolation methods or interpolation methods such as second and third orders.

When the user detects the pupil size ratio in bright or dark surroundings and stores the brightness values of the display determined to be suitable for the ambient brightness, the brightness control program displays the brightness value of the display corresponding to the pupil size ratio actually detected by interpolation. To adjust the brightness of the display.

5 is a block diagram schematically illustrating an internal configuration of a mobile communication terminal having a function of adjusting a display brightness by detecting a pupil size according to an exemplary embodiment of the present invention.

The mobile communication terminal 500 according to the present invention includes a camera unit 502, a pupil size detector 504, a memory unit 506, a microprocessor 508, a display unit 510, a key input unit 512, and a transmitter / receiver unit. 514 and the like.

Mobile communication terminal 500 according to an embodiment of the present invention is a PDA (Personal Digital Assistant), cellular phone, PCS (Personal Communication Service) phone, GSM (Global System for Mobile) phone, W-CDMA (Wideband CDMA) phone, CDMA-2000 phone, Mobile Broadband System (MBS) phone and the like. Here, MBS phone refers to a mobile phone to be used in the fourth generation system currently being discussed. In addition, in order for the mobile communication terminal 500 to access the wireless Internet through a wireless Internet network and receive multimedia data, a browser capable of transmitting and receiving data with the wireless Internet using a predetermined protocol should be installed. Such a browser may be a wireless application protocol (WAP) browser, a mobile explorer (ME) browser, an I-mode, a binary runtime environment for wireless (BREW), etc., but is not limited thereto.

The camera 502 captures an eye image of the user, that is, the sclera, the pupil, and the iris, and transmits the image data to the pupil size detector 504. The camera unit 502 preferably uses a high performance camera including a zoom lens.

The pupil size detector 504 grasps the eye image data received from the camera unit 502, obtains the pupil size ratio, and delivers it to the microprocessor 508. The process of obtaining the pupil size ratio in the pupil size detector 504 is as described above.

The memory unit 506 is a concept including a RAM, a non-volatile memory, a flash memory, a MMC memory, and the like. An operation program and a system program of the microprocessor 508 may be used. The operating program and the system program are usually stored in a ROM area and can be erased as necessary.

In addition, when the backlight of the display unit of the mobile communication terminal 500 is turned on, the memory unit 506 compares the pupil size ratio obtained by the pupil size detector 504 with a previously stored average pupil size ratio. Store a brightness adjustment program that performs a function of adjusting the brightness of the display unit 510. That is, if the newly detected pupil size ratio is smaller than the average pupil size ratio, the brightness is increased. Therefore, the brightness control program makes the brightness of the display unit 510 brighter than the brightness of the current display. If the ratio is larger than the average pupil size ratio, the surrounding becomes darker, and thus the brightness of the display unit 510 is made darker than the brightness of the current display. In addition, the memory unit 506 stores data on the average pupil size ratio, the pupil size ratio required for the scale adjustment described above, and the brightness of the display unit 510 corresponding thereto.

Meanwhile, the mobile communication terminal includes a mode state storage unit and a subscriber identity module (SIM) (not shown). The mode state storage unit stores the current operation mode of the mobile communication terminal selected by the key input unit as status flags (0, 1, 2, ...), and the microprocessor 508 determines whether the mobile communication terminal is the reception mode. The mode state storage unit is updated by assigning a unique state flag to each mode to distinguish whether the call mode, the shooting mode, the storage mode, the call mode, and the like is performed. Subscriber terminal registration information is stored in the subscriber information storage unit. Here, the subscriber station registration information is a unique number assigned to each subscriber station in the mobile communication network, and the subscriber information storage unit is inserted in the form of a card.

The microprocessor 508 controls the overall operation of the mobile communication terminal 500 based on the state flag stored in the mode state storage unit. The microprocessor 508 uses arithmetic logic operators, registers, program counters, command decoders, control circuits, and the like. Consists of. The microprocessor 508 automatically retrieves and decodes the instructions stored in the main memory, executes the decoded instructions, and automatically executes a function of storing the execution result again in the main memory. Do this.

In particular, when the power or the backlight of the display unit 510 of the mobile communication terminal 500 is turned on, the microprocessor 508 drives the brightness control program to adjust the brightness of the display unit 510. Function to control to adjust. In addition, the camera unit 502 and the pupil size detector 504 are controlled.

The display unit 510 mainly includes a liquid crystal (LCD) screen, which includes a backlight, and generally includes a state of use of a battery, a reception strength of radio waves, and a date and time. Displays the overall operating status.

The key input unit 512 has a plurality of key buttons for inputting numbers such as telephone numbers. Such key buttons typically include 12 numeric keys (0 to 9, *, #), a plurality of function keys, a plurality of cursor movement keys, and the like.

The transmitter / receiver 514 performs a function of amplifying and modulating a voice signal and an electric signal under the control of the microprocessor 508 to transmit / receive data through an antenna, and the digital signal processor 516 and baseband conversion. The unit 518, the speaker 520, the microphone 522, the RF signal processor 524, the antenna 528, and the like.

The digital signal processor 516 performs a data processing function of encoding or decoding data transmitted and received with the baseband converter 518, and performs an equalization function to remove noise of a multipath. Digital signal processing processor. In addition, the digital signal processor 516 receives the received message data RX DATA from the baseband converter 518.

The baseband converter 518 converts signals transmitted and received between the RF signal processor 524 and the digital signal processor 516, the speaker 520, and the microphone 522 into baseband signals, and converts the digital-to-analog converter and the It performs functions such as analog-to-digital conversion. In addition, the baseband converter 518 converts the transmission message data TX DATA input from the microprocessor 508 into a transmission message signal TXIQ and outputs it to the RF signal processor 524 or the RF signal processor 524. The received message signal (RXIQ) inputted from) is converted into received message data (RX DATA) and output to the digital signal processor 516. The baseband converter 518 automatically controls the gain for the power of the RF signal processor 524 (AGC).

 The speaker 520 outputs an audio signal output from the baseband converter 518 as an audible sound, and the microphone 522 converts a user's voice input into an electrical signal.

The RF signal processor 524 converts the transmission message signal TXIQ into a radio frequency (RF) signal and outputs it to the antenna 526, or converts an RF signal applied from the antenna 526 into a reception message signal RXIQ. Output to the baseband converter 518. The antenna 526 transmits an RF signal to the air or transmits an RF signal received from the air to the RF signal processor 524.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and changes without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

As described above, according to the present invention, the display device detects a change in the pupil size of the user and automatically adjusts the brightness of the display suitable for the brightness around the user. In addition, since the brightness of the display is different according to the ambient brightness felt by the user, the user directly stores the brightness data that is determined to be the most suitable for the user and automatically adjusts the brightness of the display. By automatically providing the optimal display brightness that fits, you can minimize eye strain.

Claims (21)

In the display device that can automatically adjust the brightness, A camera unit for capturing an eye image of a user of the display device and transferring the eye image data to a pupil size detector; A pupil size detector which analyzes the eye image data transmitted from the camera unit, calculates a ratio of a radius of a pupil and an iris (hereinafter referred to as a “pupillary size ratio”) and transmits the same to a display controller; Storing data about an average pupil size ratio and a brightness value of the display corresponding to the average pupil size ratio, and comparing the pupil size ratio received from the pupil size detector with the previously stored average pupil size ratio to determine the brightness of the display. A memory unit for storing a brightness adjustment program for performing a function of adjusting; A display controller configured to drive the brightness control program to transmit a brightness control signal for controlling the brightness of the display corresponding to the pupil size ratio obtained by the pupil size detector to a display; And A display configured to receive the brightness control signal from the display controller and provide the user with the brightness of the display corresponding to the pupil size ratio Display device capable of adjusting the brightness by detecting the pupil size, characterized in that it comprises a. The method of claim 1, And the pupil size detector is configured to obtain the pupil size ratio by using a circular edge detection method or a Hough transform. The method of claim 1, The brightness value of the display corresponding to the average pupil size ratio and the average pupil size ratio stored in the memory unit may be selected and stored according to the user's convenience. Display device. The method of claim 3, wherein The brightness value of the display corresponding to the average pupil size ratio and the average pupil size ratio that are selected and stored according to the user's convenience may be deleted and changed according to the user's convenience. Display device with adjustable brightness. The method of claim 1, The brightness adjusting program compares the pupil size ratio received from the pupil size detector with the previously stored average pupil size ratio, and if the pupil size ratio is larger than the average pupil size ratio, the brightness of the display is darker than the brightness of the average display. And adjusting the brightness of the display so that the brightness of the display is brighter than the brightness of the average display when the pupil size ratio is smaller than the average pupil size ratio. The method of claim 1, The brightness control program is configured to display the display corresponding to the pupil size ratio obtained by the pupil size detector based on two or more pupil size ratios previously stored in the memory unit and brightness values of the display corresponding to the pupil size ratio. Display device capable of adjusting the brightness by detecting the pupil size, characterized in that for determining the brightness value of. The method of claim 6, The brightness values of the display corresponding to the two or more pupil size ratios and the pupil size ratios pre-stored in the memory unit are selected and stored according to the user's convenience of the display device. Display device with adjustable brightness. The method of claim 7, wherein The two or more pupil size ratios selected and stored according to the user's convenience and the brightness values of the display corresponding to the pupil size ratio can be deleted and changed according to the user's convenience. Display device with adjustable brightness. The method of claim 6, The brightness control program is a display device capable of adjusting the brightness by detecting the pupil size, characterized in that for determining the brightness value of the display corresponding to the pupil size ratio obtained by the pupil size detector using the interval setting method or interpolation method. The method of claim 1, The display may include a monitor, a TV CRT, and a liquid crystal display (LCD). The display apparatus may detect brightness of the pupil and adjust brightness. In a mobile communication terminal having a display brightness control function to automatically adjust the display brightness, A camera unit for capturing an eye image of a user of the mobile communication terminal and delivering eye image data to a pupil size detector; A pupil size detector which analyzes the eye image data received from the camera unit, calculates a ratio of the radius of the pupil and the iris (hereinafter referred to as the “pore size ratio”) and transmits it to a microprocessor; Storing data about an average pupil size ratio and a brightness value of the display corresponding to the average pupil size ratio, and comparing the pupil size ratio received from the pupil size detector with the previously stored average pupil size ratio A memory unit for storing a brightness adjusting program for performing a function of adjusting the brightness; A function of controlling the camera unit and the pupil size detector and transmitting a brightness control signal for controlling the brightness of the display corresponding to the pupil size ratio obtained by the pupil size detector by driving the brightness adjustment program to a display unit; A microprocessor for performing; A display unit configured to receive the brightness control signal from the microprocessor and provide the user with brightness of the display corresponding to the pupil size ratio; A key input unit having number and letter buttons and function buttons for function selection; And Transmitter / receiver responsible for transmitting and receiving data between the mobile communication terminal and the mobile communication network under the control of the microprocessor. Mobile communication terminal having a function of adjusting the display brightness by detecting the pupil size, characterized in that it comprises a. The method of claim 11, The display unit includes a liquid crystal display (LCD) and a backlight, the mobile communication terminal having a function of adjusting the display brightness by detecting the pupil size. The method of claim 11, The microprocessor is a mobile communication terminal having a function of adjusting the display brightness by detecting the pupil size, characterized in that for operating the camera unit when the display unit is powered on. The method of claim 11, The brightness adjusting program compares the pupil size ratio received from the pupil size detector with the previously stored average pupil size ratio, and if the pupil size ratio is larger than the average pupil size ratio, the brightness of the display is darker than the brightness of the average display. And when the pupil size ratio is smaller than the average pupil size ratio, adjusting the display brightness by detecting the pupil size, wherein the display brightness is adjusted to be brighter than the average display brightness. . The method of claim 11, The brightness control program is configured to display the display corresponding to the pupil size ratio obtained by the pupil size detector based on two or more pupil size ratios previously stored in the memory unit and brightness values of the display corresponding to the pupil size ratio. The mobile communication terminal having a function of adjusting the display brightness by detecting the pupil size, characterized in that for determining the brightness value of. The method of claim 11, The mobile communication terminal includes a cellular phone, a PCS phone, a personal digital assistant (PDA), a global system for mobile (GSM) phone, a wideband CDMA (W-CDMA) phone, a CDMA-2000 phone, and a mobile broadband (MBS). System) A mobile communication terminal having a function of adjusting the display brightness by detecting the pupil size, characterized in that it comprises a phone. As a method of automatically adjusting the brightness of the display device, (a) capturing an eye image of a user of the display device and outputting eye image data; (b) analyzing the eye image data to obtain a ratio of the radius of the pupil and the iris (hereinafter referred to as “pupillary size ratio”); (c) comparing the pupil size ratio with a previously stored average pupil size ratio; determining brightness values of the display device according to a comparison result; And (e) setting brightness of the display device according to the determined brightness value of the display device; Method of controlling the brightness adjustment of the display device by detecting the pupil size comprising a. 18. The method of claim 17, wherein in step (d), If the pupil size ratio is greater than the average pupil size ratio, the brightness value of the display device is determined to be darker than the brightness value of the average display device. If the pupil size ratio is less than the average pupil size ratio, the brightness value of the display device is determined. And controlling the brightness of the display device by detecting the pupil size, wherein the pupil size is determined to be brighter than the brightness value of the average display device. 18. The method of claim 17, wherein in step (d), The determining of the brightness value of the display device is based on two or more pre-stored pupil size ratios and brightness values of the display device corresponding to the pupil size ratios, and the brightness of the display device corresponding to the pupil size ratios. A method for controlling brightness control of a display device by detecting a pupil size, the method comprising determining a value. The method of claim 19, The determining of the brightness value of the display device corresponding to the pupil size ratio is determined by using an interval setting method or an interpolation method. The method of claim 17, The display device includes a monitor, a TV CRT, and a liquid crystal display (LCD).

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