KR100621007B1 - Camera Flash Device and Control Method of Mobile Device - Google Patents

Abstract

The present invention is to automatically and manually adjust the flash brightness for the shooting of the multimedia portable terminal, the photographing unit for photographing the object by the control signal and output as an electrical video signal; A controller which controls the photographing unit to photograph and adjusts the brightness of the flash by pulse width modulation step by step; A sensor unit connected to the control unit and automatically detecting brightness of each stage around the photographed object and outputting a corresponding control signal; A keyboard unit connected to the control unit and manually inputting a command to control photographing and flash brightness; A charge pump unit which outputs the current charged by the pulse width modulation discharge control signal applied from the control unit at one time; Characterized in that it comprises a flash which emits light because it is connected to the charge pump unit and discharges the applied current, and further comprising: a photographing process of determining whether to use the flash when photographing an object with a portable terminal; A flash process of automatically controlling brightness or manually controlling the flash when the flash is determined to be used; Selecting the operation of the flash by the automatic or manual control, characterized in that consisting of an operation process of shooting at the set brightness by the step-by-step pulse width modulation, reducing the current consumption of the flash, extending the life of the battery, generating heat of the flash It has the effect of shortening and extending the life.

Description

Camera flash device and control method of mobile terminal {A METHOD AND A APPARATUS OF CONTROLLING BRIGHTNESS OF FLASH FOR MULTIMEDIA MOBILE PHONE}

1 is a functional block diagram of a flash control device of a portable terminal according to the prior art;

2 is a functional diagram of a camera flash brightness adjusting device of the present invention portable terminal,

Figure 3 is a flow chart of the camera flash brightness adjustment method of the present invention portable terminal.

          ** Description of symbols on the main parts of the drawing **

100: recording unit 110: control unit 120: sensor unit

130: keyboard portion 140: charge pump unit 150: flash

The present invention relates to flash brightness adjustment for camera photography of a multimedia portable terminal, and in particular, since it is used as a discharge control signal by controlling the pulse width or the pulse period, it is possible to adjust the brightness of the flash, to extend the life and to consume a small current It relates to a camera flash device and a control method of a terminal.

A mobile terminal (MS) is registered in a mobile communication system and moves freely in a service area formed by a plurality of base stations (BS) while wirelessly connecting with the base station (BS). Connected to the switching center (MSC: MOBILE SWITCHING CENTER), by means of switching (SWITCHING) and control (CONTROL) of the mobile switching station (MSC) anytime and anywhere by wireless communication with the desired party anytime and anywhere, the individual MS (Mobile Terminal) It is a high-tech wireless communication device that has the advantage of communicating with the other party while carrying and moving directly.

The communication method using the above-mentioned portable terminal is a text message data communication method using text, symbols, numbers, graphic images, etc. in a second generation, from a communication method using a voice level signal in an initial or first generation. The current third generation mobile communication system is developing into a multimedia communication method including a video signal in an audio signal and a message signal.

In the multimedia communication method, the most important thing is to take a video signal and transmit it to the other party. The video signal includes a still image signal and a video signal, but when the communication is used, the video is used and the communication is not used. It is mainly used to record and record still image like general camera, and it is judged to record and record moving image even if it is not used for communication by future technology development.

In the case of capturing a video signal using a MULTIMEDIA portable terminal as described above, if the surrounding environment is dark, the required amount of light is supplied using a flash, but the amount of light required by the shooting environment is different, so the flash It is necessary to adjust the amount of light output from the), and also equipped with a flash to adjust the amount of light required for the mobile terminal (MS).

Accordingly, there is a need to develop a light amount control technology of the flash mounted on the mobile terminal MS.

Hereinafter, a camera flash control apparatus of a portable terminal according to the prior art will be described with reference to the accompanying drawings.

Attached to explain the prior art, Figure 1 is a functional block diagram of a flash control device of a conventional terminal.

Referring to FIG. 1, the flash control apparatus for a portable terminal according to the prior art is a signal (H) for controlling the light emission or discharge of the flash 30 by a control unit 10 for controlling and monitoring the operation of the entire portable terminal. Outputs

Since the flash 30 requires a predetermined voltage and consumes a large amount of current at once, the flash 30 requires a charge pump unit 20, and the charge pump unit 20 supplies operating power to a portable terminal. The battery receives current from the battery to be supplied and charges the current, and outputs the current charged by the discharge control signal H applied from the controller.

That is, the discharge control signal H output from the control unit 10 has a constant DURATION, and is applied to an EN (EN: ENABLE) terminal of the charge pump unit 20, and the charge pump unit When the discharge control signal (H) is applied to the enable (EN) terminal (20), the voltage and current charged in the flash 30 connected to the ground terminal (IN) at the output terminal and the input terminal (OUT) instantaneously Discharge (DISCHARGE).

As described above, the flash 30 receiving the instantaneously discharged current from the charge pump unit generates intense white light and is made of a white flash LED, and the magnitude of the current applied from the charge pump unit 20. The brightness to emit light is determined by.

The charge pump unit 20 inputting the discharge control signal output from the controller 10 outputs the charged current to the flash 30 made of the white LED, and emits light, thereby causing the controller 10 to emit light. Since the discharge control signal H output from the output is a constant pulse width (DURATION), the brightness of the flash 30 is always constant.

However, it is necessary to change the brightness of the flash according to the change of the surrounding environment to be photographed, but the pulse width DURATION of the discharge control signal H output from the controller 10 is always constant. have.

The present invention is to control the current supplied to the flash of the multimedia mobile terminal for capturing the video signal by pulse width modulation (PDM or PWM) and pulse period, in particular the camera flash device and control of the mobile terminal to adjust the brightness in steps according to the surrounding environment The purpose is to provide a method,

The present invention devised to achieve the above object, the photographing unit for photographing the object by the control signal and output as an electrical image signal; A controller which controls the photographing unit to photograph and adjusts the brightness of the flash by pulse width modulation step by step; A sensor unit which is connected to the control unit and automatically detects brightness of each stage around the photographed object and outputs a corresponding control signal; A keyboard unit connected to the control unit and manually inputting a command to control photographing and flash brightness; A charge pump unit which outputs a current charged by the pulse width modulation discharge control signal applied from the control unit at one time; It is characterized in that the configuration comprises a flash to emit light because it discharges the current applied in connection with the charge pump.

In addition, the present invention devised to achieve the above object, the photographing process of determining whether to use a flash when photographing an object with a mobile terminal; If it is determined that the flash is to be used, a flash process of automatically or manually controlling the brightness; It characterized by consisting of an operation process of controlling the flash selected by the automatic or manual control by the pulse width modulation and shooting by the set step brightness.

Hereinafter, a camera flash apparatus and a control method of a portable terminal according to the present invention will be described with reference to the accompanying drawings.

It is attached to illustrate the present invention, Figure 2 is a functional block diagram of the camera flash brightness adjustment device of the mobile terminal according to the present invention, Figure 3 is a flow chart of the camera flash brightness adjustment method of the mobile terminal according to the present invention.

Referring to FIG. 2, the camera flash apparatus of the mobile terminal according to the present invention includes a photographing unit 100 for photographing and outputting an electric image signal corresponding to a photographed object by a corresponding control signal;

By controlling the photographing unit 100 to output an image signal and outputting a discharge control signal for adjusting the brightness of the flash (FLASH) according to the input control command, the keyboard brightness is automatically controlled from the keyboard 130 When a command is inputted, a command for outputting a corresponding discharge control signal by pulse width control or pulse period change control according to a control signal applied from the sensor unit 120 and directly controlling the flash brightness from the keyboard unit 130. When the input is the control unit 110 for outputting a corresponding discharge control signal,

A sensor unit 120 connected to the control unit 110 and automatically detecting an ambient brightness of an object to be photographed and outputting a corresponding control signal;

A keyboard unit 130 connected to the controller 110 for manually inputting a photographing control command and a flash brightness control signal;

Discharge the current applied by the discharge control signal applied from the controller 110 at one time, and discharge the current applied from the controller 110 by charging a predetermined amount of current applied from a battery for supplying operating power to the mobile terminal. Charge pump unit 140 output by the control signal,

The discharge pump is connected to the charging pump 140 and discharges the applied current, so it is made of a white LED that emits light, and when a constant voltage and current is applied, the flash 150 is configured to output white light at a time.

Hereinafter, according to the present invention having the configuration described above, the camera flash brightness control device of the portable terminal will be described in detail with reference to the accompanying drawings.

The portable terminal MS outputs an image signal photographing an object by a corresponding control signal applied from the controller 110 by the photographing unit 100 formed of a CDC or CMOS. The part 100 is not good or good to shoot the image signal due to the brightness of the surrounding environment, should illuminate the necessary light, the light is generated from the flash 150.

The flash 150 is made of a white LED (WHITE LED), and consumes a certain voltage and a large current at a time, and in order to operate the flash 150, the charge pump unit 140 operates in a portable terminal. The flash 150 is operated since the current is supplied from the battery for supplying power, charged, pumped and stored constantly, and outputted by the discharge control signal applied from the controller 100.

The discharge control signal output by the controller 110 is determined by a corresponding control command signal which automatically measures and outputs the brightness around the object to be photographed by the sensor unit 120 or by manual input from the keyboard unit. It is determined by the corresponding control command signal of upper, middle, and lower.

The control unit 110 controls the pulse width (PULSE WIDTH) to control the brightness of the flash 150 determined by the control command or the discharge control signal for controlling the generation period of the pulse the charge pump unit 140 Since it outputs to, to control the brightness of the flash (150).

The brightness output from the flash 150 is changed by the pulse width or the pulse generation period of the discharge control signal output from the controller 110, that is, the flash when the pulse width is wide or the pulse generation cycle is fast. Outputs bright light, and the flash 150 outputs light that is not bright when the width of the pulse is narrow or the generation cycle of the pulse is late.

In addition, even when the flash outputs the same brightness, the current is intermittently applied by the pulse signal, thereby outputting the same brightness with less current consumption, extending the life of the flash, reducing heat generation, and supplying current. There are advantages such as longer battery life.

Hereinafter, a camera flash brightness control method of a mobile terminal according to the present invention will be described with reference to the accompanying drawings.

Determining whether to use the flash when photographing the object with the mobile terminal MS, and determining whether to photograph the object with the portable terminal (S100); When photographing an object with the mobile terminal MS in the process (S100), the photographing process consisting of a process of determining whether or not to use the flash (FLASH);

If it is determined that the flash is used in the above process, by automatically controlling or manually controlling the brightness, determining whether or not to manually or automatically select the flash brightness of the mobile terminal (S120); In the case of determining manually in the checking process (S120), the step of selecting and setting the brightness of the flash according to the selection command of the strong, medium and weak input from the keyboard unit 130 (S130); In the case of determining automatically in the checking process (S120), the flash process comprising the step of automatically setting the brightness of the flash (S140) according to the control signal input from the sensor unit 120,

An operation process of photographing together with the operation of the flash controlled to the brightness set in the process (S150);

When not using the flash in the photographing process (S110) is a configuration consisting of a general process (S160) to shoot using natural light.

Hereinafter, according to the present invention having the configuration described above, a camera flash brightness adjustment method of a portable terminal will be described in detail with reference to the accompanying drawings.

When the object is to be photographed by the multimedia portable terminal capable of capturing the video signal (S100), it is determined whether to use a flash to clearly photograph the object using bright lighting (S110).

When the flash is not used in the determination (S110), the photographing of the object is performed by using natural light (S160). When the clearing of the object is desired by using the flash in the determination (S110), the flash of the flash 150 is determined. It is determined whether to control the light brightness automatically or manually (S120).

When the brightness of the flash 150 is manually controlled in the determination (S120), the intensity of light, medium, and weak is selected by the corresponding control command input from the keyboard unit 130, and the selected control is performed. The control unit inputting the command outputs the discharge control signal of the pulse width or the pulse period to the charge pump unit (S130).

In addition, when automatically controlling the light brightness of the flash 150 in the determination (S120), the control unit 110 inputs a corresponding control command signal applied by measuring the brightness of the surrounding environment from the sensor unit 120 Controls the pulse width or pulse period of the discharge control signal to be output to the charge pump unit (S140).

When the control signal to be photographed in the state that the pulse width or the period of the pulse applied to the charge pump unit 140 is determined as described above is applied to the control unit through the keyboard unit 130, the charge pump unit 140 Since the current flows through the flash 150 generates light, the photographing unit 100 photographs a clear object by the light generated by the flash and outputs the corresponding image signal to the controller 110 ( S150).

That is, the brightness of the flash 150 is adjusted by manually setting or automatically sensing the ambient brightness of the object to be photographed, and the brightness adjustment is determined by the width or period of the pulse signal output from the controller.

Therefore, since the current is consumed only while the pulse is inputted, the current consumption is small and prolongs the life of the battery of the portable terminal, and the flash 150 does not always operate, but only while the pulse is inputted. It has the advantage of longer life and reduced heat generation.

The mobile terminal of the present invention having the above-described configuration automatically measures or manually determines the brightness level of the surrounding environment, and controls the brightness level of the flash by pulse width modulation, thereby reducing the power consumption and enabling clear photography. It works.

In addition, since the current applied to the flash is applied in the form of pulse width modulation, there is a convenient effect in use to reduce the current consumption and extend the life of the battery.

In addition, since the flash is operated by the pulse signal, there is a convenient effect in use that the heat generation is small, the life is long by the intermittent operation.

Claims (10)

A photographing unit which photographs an object by a control signal and outputs the electric image signal; A control unit for photographing by controlling the photographing unit, and adjusting the brightness of the flash step by step with pulse width modulation; A sensor unit which is connected to the control unit and automatically detects brightness of each stage around the photographed object and outputs a corresponding control signal; A keyboard unit connected to the control unit and manually inputting a command to control shooting and flash brightness; A charge pump unit for outputting a current charged by the pulse width modulation discharge control signal applied from the control unit at a time; And a flash to emit light since the current is connected to the charging pump and discharges the applied current. The method of claim 1, wherein the control unit, When a command for automatically controlling the flash brightness is input from the keyboard unit, a pulse width modulated discharge control signal is output to the charge pump unit according to a control signal applied in steps of brightness from the sensor unit, And a pulse width modulation discharge control signal of a selected step is outputted when a command for manually controlling flash brightness is input from the keyboard unit. The method of claim 2, And a discharge control signal output by the pulse width modulation is configured to control the width of the pulse or to change the period of the pulse. The method of claim 1, wherein the charge pump unit, And a pulse width modulated discharge control signal applied from the control unit by charging a current of the operating power applied from the portable terminal battery and outputting the predetermined current. The method of claim 1, wherein the flash, When a constant voltage and current is applied from the charge pump unit, the camera flash device of the portable terminal, characterized in that the white light outputs at a time consisting of a configuration consisting of a white LED. A photographing process of determining whether to use a flash when photographing an object with a mobile terminal, If it is determined that the flash is to be used, the flash process automatically or manually controls the brightness; And controlling the flash selected by the automatic or manual control by pulse width modulation, and photographing by the set step brightness. The method of claim 6, When the flash is not used in the photographing process, the camera flash control method of the portable terminal, characterized by further comprising a general process of photographing using natural light. The method of claim 6, wherein the photographing process, Determining whether to photograph an object with the mobile terminal; When photographing with the portable terminal, the camera flash control method of the portable terminal, characterized in that the process consisting of determining whether or not to use the flash. The method of claim 6, wherein the flash process, A confirmation process for determining whether the flash brightness of the mobile device is selected manually or automatically; In the case of determining manually in the checking process, selecting and setting the brightness of the flash according to the selection command of the strong, medium, and weak input from the keyboard unit; In the case of determining automatically in the confirmation process, the camera flash control method of the portable terminal, characterized in that the step of automatically setting the brightness of the flash in step by the control signal input from the sensor unit. The method of claim 6, wherein the operation process, Controlling the flash at the set brightness, the camera flash control method of the portable terminal, characterized in that for shooting by operating the flash at the same time shooting.

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