KR20090016920A - Device and method for measuring illumination in wireless terminal - Google Patents

Device and method for measuring illumination in wireless terminal Download PDF

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Publication number
KR20090016920A
KR20090016920A KR1020070081260A KR20070081260A KR20090016920A KR 20090016920 A KR20090016920 A KR 20090016920A KR 1020070081260 A KR1020070081260 A KR 1020070081260A KR 20070081260 A KR20070081260 A KR 20070081260A KR 20090016920 A KR20090016920 A KR 20090016920A
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KR
South Korea
Prior art keywords
illuminance
brightness value
led light
value
backlight led
Prior art date
Application number
KR1020070081260A
Other languages
Korean (ko)
Inventor
서명교
Original Assignee
삼성전자주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 삼성전자주식회사 filed Critical 삼성전자주식회사
Priority to KR1020070081260A priority Critical patent/KR20090016920A/en
Publication of KR20090016920A publication Critical patent/KR20090016920A/en

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/22—Illumination; Arrangements for improving the visibility of characters on dials
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/14—Detecting light within display terminals, e.g. using a single or a plurality of photosensors
    • G09G2360/144—Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light being ambient light
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M2250/00—Details of telephonic subscriber devices
    • H04M2250/12—Details of telephonic subscriber devices including a sensor for measuring a physical value, e.g. temperature or motion

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Signal Processing (AREA)
  • Telephone Function (AREA)

Abstract

An apparatus and a method for measuring the illumination in the portable terminal are provided to deliver the clear image in the dark place by sensing the necessary illumination and by flashing the light on the object. In the illumination measurement mode, the controller compares the brightness value of the light(B) radiating in the back light(B/L) LED of the display with the brightness value of the outside light(A) reflected through the reflective plate of the display unit(203). If the brightness value of the B/L LED light is greater than the brightness value of the outside light(204), the controller indicates the display unit in the color corresponding to the backlight LED light(207). If the illumination photometry is selected by the user who recognizes that the display unit is indicated as the color corresponding to the B/L LED light(208), the controller measures the current amount of the B/L LED light of the moment in which the illumination photometry is selected(209). The controller extracts illumination value of the display surface corresponding to the current amount of the measured B/L LED light from the illumination value table of the memory(210). If the illumination value of the extracted display surface is smaller than the reference illuminated value for the flash automatic setting(211), the controller sets up the flash on(ON) automatically(212).

Description

Apparatus and method for measuring illuminance of a mobile terminal {DEVICE AND METHOD FOR MEASURING ILLUMINATION IN WIRELESS TERMINAL}

The present invention relates to an apparatus and method for measuring illuminance of a portable terminal, and more particularly, to an apparatus and method for measuring illuminance of a portable terminal for measuring illuminance of a surrounding environment using a display unit.

In recent years, not only portable terminals (camera phones) equipped with cameras but also video telephones have been widely used. In the case of a camera phone, illuminance (amount of light and light brightness) has a decisive influence on taking pictures as well as a camera.

In general, the camera module used in the portable terminal has to be made smaller than the general camera, so the picture quality is not good, especially in the dark.

In order to solve this problem, portable terminals and video telephones with a built-in illuminance sensor (or illuminance sensor) are emerging.

The illuminance sensor is attached to a predetermined area of the photographing apparatus of the mobile phone terminal to detect illuminance around the subject, and measure illuminance around the subject. Accordingly, when illumination is required, light is supplied to the subject by using a light emitting diode. give.

It detects the illumination required for shooting and illuminates the subject with the appropriate illumination to deliver clear images even in dark places.

Also, in recent years, the eyesight of students, office workers, and the like has deteriorated a lot, and it is very important that the brightness or illuminance of light such as a fluorescent lamp or a stand in a school, home, or workplace is very important.

However, such a conventional portable terminal automatically operates the illuminance sensor only when the camera is operated, and in general, the illuminance of the fluorescent lamp, the stand, the incandescent lamp, etc. cannot be measured according to the needs of the user. Had to measure

Accordingly, an object of the present invention is to provide an apparatus and method for measuring illuminance of a portable terminal, and to provide an apparatus and method for measuring illuminance of a portable terminal for measuring illuminance of a surrounding environment using a display unit.

An illuminance measuring apparatus of a portable terminal for achieving the above object comprises: a display unit comprising a semi-transmissive LCD including a backlight LED and a reflecting plate; In the illuminance measurement mode, if the brightness value of the backlight LED light B is greater than the brightness value of the external light A reflected through the reflector, the surface roughness value of the display unit corresponding to the current amount of the backlight LED light B is carried. It characterized in that it comprises a control unit for controlling to extract to the illuminance value of the place where the terminal is located.

In addition, a method of measuring illuminance of a portable terminal for achieving the above object is to compare the brightness value of the backlight LED light A of the display unit with the brightness value of the external light B reflected through the reflector of the display unit in the illuminance measurement mode. Process; If the brightness value of the backlight LED light (A) is greater than the brightness value of the external light (B), measuring a current amount of the backlight LED light; And extracting surface roughness values of the display unit corresponding to the measured amount of current of the backlight LED light.

That is, as described above, the present invention provides an apparatus and method for measuring illuminance of a mobile terminal using the display unit to measure illuminance of the surrounding environment, whereby the camera flash can be automatically adjusted by using the illuminance of the surrounding environment. It recommends the brightness of light recommended for reading / detailed work, and it is effective for the user to find out what kind of work he / she is suitable for.

DETAILED DESCRIPTION Hereinafter, detailed descriptions of preferred embodiments of the present invention will be described with reference to the accompanying drawings. It should be noted that the same components in the figures represent the same numerals wherever possible.

1 is a block diagram of a portable terminal according to an embodiment of the present invention.

Referring to FIG. 1, the RF unit 123 performs a wireless communication function of the portable terminal. The RF unit 123 includes an RF transmitter for upconverting and amplifying a frequency of a transmitted signal, and an RF receiver for low noise amplifying a received signal and downconverting a frequency of the received signal. The modem 120 includes a transmitter for encoding and modulating the transmitted signal, a receiver for demodulating and decoding the received signal, and the like. The audio processor 125 may configure a codec, and the codec includes a data codec for processing packet data and an audio codec for processing an audio signal such as voice. The audio processor 125 converts and reproduces the digital audio signal received from the modem 120 into an analog signal through the audio codec or outputs an analog audio signal generated from a microphone and transmitted through the audio codec through the audio codec. Convert to and transmits to the modem (120). The codec may be provided separately or included in the controller 110.

The memory 130 may be composed of program memory and data memories. The program memory may store programs for controlling the general operation of the portable terminal and programs for measuring illuminance using the display unit according to an exemplary embodiment of the present invention. The data memory also temporarily stores data generated during the execution of the programs.

In addition, the memory 130 has a current amount of a backlight (B / L: Back Light) LED light B of the display unit 160 and a surface roughness value of the display unit 160 corresponding to the current amount. It contains a table of previously measured and stored illuminance values.

The controller 110 controls a general operation of the mobile terminal. In addition, the controller 110 may include the modem 120 and the codec.

In addition, the controller 110 according to an exemplary embodiment of the present invention, the external light A in which the brightness value of the backlight LED light B of the display unit 160 is reflected through the reflector of the display unit 160 in the illuminance measurement mode. If greater than the brightness value of the control unit to display the display unit 160 in a color corresponding to the backlight LED light (B).

In addition, the control unit 110 when the illuminance measurement is selected by the user when the display unit 160 is displayed in a color corresponding to the backlight LED light (B) according to an embodiment of the present invention, the current amount of the backlight LED The measurement is performed to extract the surface roughness value of the display unit corresponding to the measured amount of current from the illuminance value table of the memory.

In addition, the controller 110 according to an embodiment of the present invention, if the brightness value of the backlight LED light (B) is less than the brightness value of the external light (A) in the illuminance measurement mode, the external light (A) The display unit 160 is displayed in a corresponding color, and the brightness of the backlight LED light B is increased.

In addition, the controller 110 switches to the illuminance measurement mode when the flash auto setting is selected in the photographing mode according to the exemplary embodiment of the present invention, and compares the illuminance value extracted from the illuminance measurement mode with the reference illuminance value to turn on / off the flash. Control to turn off automatically.

In addition, the controller 110 switches to the illuminance measurement mode and displays the illuminance value extracted from the illuminance measurement mode when the ambient light intensity measurement mode is selected in the portable terminal according to the exemplary embodiment of the present invention.

The camera unit 140 captures image data, and includes a camera sensor that converts the photographed optical signal into an electrical signal, and a signal processor that converts the analog image signal captured by the camera sensor into digital data. Herein, it is assumed that the camera sensor is a CCD sensor, and the signal processor may be implemented by a digital signal processor (DSP). In addition, the camera sensor and the signal processor may be integrally implemented or may be separately implemented.

The image processor 150 performs a function of generating screen data for displaying an image signal output from the camera unit 140. The image processor 150 processes the image signal output from the camera unit 140 in units of frames, and outputs the frame image data according to the characteristics and size of the display unit 160. In addition, the image processing unit 150 includes an image codec and performs a function of compressing the frame image data displayed on the display unit 160 in a set manner or restoring the compressed frame image data to the original frame image data. . The image codec may be a JPEG codec, an MPEG4 codec, a wavelet codec, or the like. It is assumed that the image processor 150 has an On Screen Display (OSD) function, and may output on-screen display data according to a screen size displayed under the control of the controller 110.

The display unit 160 displays an image signal output from the image processor 150 on a screen, and displays user data output from the controller 110. In this case, the display unit 160 may use an LCD. In this case, the display unit 160 may include an LCD controller, a memory capable of storing image data, and an LCD display device. In this case, when the LCD is implemented using a touch screen method, the LCD may operate as an input unit.

In addition, the display unit 160 is configured as a semi-transmissive LCD according to an embodiment of the present invention, and includes a backlight LED and a reflecting plate therein. The display unit 160 reflects the external light A through the reflecting plate, and allows the user to see data displayed on the display unit through the backlight LED light B. FIG.

In addition, the display unit 160 when the brightness value of the backlight LED light (B) is greater than the brightness value of the external light (A) reflected through the reflector according to the embodiment of the present invention, the backlight LED light (B) It is displayed in the corresponding color.

In addition, the display unit 160 is connected to the external light A when the brightness value of the backlight LED light B is smaller than the brightness value of the external light A reflected through the reflector according to the exemplary embodiment of the present invention. The corresponding color is displayed.

The key input unit 127 includes keys for inputting numeric and character information and function keys for setting various functions. In addition, the key input unit 127 may include an illumination measurement mode switch key and a function key for selecting an illumination measurement according to an exemplary embodiment of the present invention.

An operation of measuring illuminance using the display unit in the above-described portable terminal will be described in detail with reference to FIGS. 2 and 3.

FIG. 2 is a flowchart illustrating a process of measuring illuminance in a portable terminal according to a first embodiment of the present invention, and is a flowchart illustrating a process of automatically setting a flash by measuring illuminance in a photographing mode of the portable terminal.

Hereinafter, an embodiment of the present invention will be described in detail with reference to FIG. 1.

Referring to FIG. 2, when the automatic flash setting is selected in step 201, which is a shooting mode of the portable terminal, the controller 110 detects it and switches to the illuminance measuring mode in step 202.

In the illuminance measurement mode, the control unit 110 controls the brightness of light B emitted from the backlight B / L LED of the display unit 160 and the external light A reflected through the reflector of the display unit 160. Proceed to step 203 to compare the brightness value of).

As a result of the comparison, when it is determined that the brightness value of the backlight LED light B is smaller than the brightness value of the external light A, the control unit 110 detects it in step 204 and the display unit 160 in step 205. In step 206, the display device displays a color corresponding to the external light A and increases a brightness value of the backlight LED light B.

In addition, as a result of the comparison, if the brightness value of the backlight LED light B is greater than the brightness value of the external light A, the controller 110 detects it in step 204 and causes the display unit 160 to display the backlight LED. The display proceeds to step 207 in which the color corresponding to the light B is displayed.

When illuminance measurement is selected by the user who recognizes that the display unit 160 is displayed in the color corresponding to the backlight LED light B in step 207, the controller 110 detects the illuminance in step 208. In step 209, the current amount of the backlight LED light B is measured.

In the case of a display unit composed of a general semi-transmissive LCD, the reflecting plate of the display unit reflects the external light A of the surrounding environment and the data of the display unit can be viewed by the user through the backlight LED light B. Therefore, the user can recognize the data displayed on the display only when the brightness value of the backlight LED light (B) is greater than the external light (A), wherein the user corresponds to the backlight LED light (B) in the display unit I can recognize the color to say.

That is, when the brightness value of the backlight LED light B is greater than the brightness value of the external light A, when the display unit 160 displays the color corresponding to the backlight LED light B, the user recognizes it. May select the roughness measurement as in step 207 and step 208.

The controller 110 extracts an illuminance value of the surface of the display unit corresponding to the amount of current of the backlight LED light B measured in step 209 from the illuminance value table of the memory 130.

If the illuminance value of the surface of the display unit extracted in step 210 is smaller than the reference illuminance value for automatic flash setting, the control unit 110 detects this in step 211 and automatically sets the flash on (Step 212). Progress. Alternatively, when the illuminance value of the surface of the display unit extracted in step 210 is greater than the reference illuminance value for automatic flash setting, the control unit 110 detects this in step 211 and automatically sets the flash off (step 213). Proceed.

3 is a flowchart illustrating a process of measuring illuminance in a portable terminal according to a second embodiment of the present invention, and is a flowchart illustrating a process of measuring illuminance in a peripheral environment illuminance measurement mode of the portable terminal and informing a user of the illuminance; .

Hereinafter, an embodiment of the present invention will be described in detail with reference to FIG. 1.

Referring to FIG. 3, when the ambient light intensity measurement is selected in the portable terminal, the controller 110 detects it and proceeds to step 301 of switching the portable terminal to the light intensity measurement mode for measuring the light intensity of the surrounding environment.

In the illuminance measurement mode, the control unit 110 controls the brightness of light B emitted from the backlight B / L LED of the display unit 160 and external light A reflected through the reflector of the display unit 160. Step 303 compares the brightness values of the "

As a result of the comparison, when it is determined that the brightness value of the backlight LED light B is smaller than the brightness value of the external light A, the control unit 110 detects it in step 304 and the display unit 160 in step 305. In step 306, the display device displays a color corresponding to the external light A and increases a brightness value of the backlight LED light B.

In addition, as a result of the comparison, if the brightness value of the backlight LED light (B) is greater than the brightness value of the external light (A), the control unit 110 detects this in step 304 and the display unit 160 the backlight LED In operation 307, the display device displays a color corresponding to the light B.

When the illuminance measurement is selected by the user who recognizes that the display unit 160 is displayed in the color corresponding to the backlight LED light B in step 307, the control unit 110 detects it in step 308. In step 309, the amount of current of the backlight LED light B is measured at the time of illuminance measurement.

The controller 110 extracts an illuminance value of the surface of the display unit corresponding to the amount of current of the backlight LED light B measured in step 809 from the illuminance value table of the memory 130.

The controller 110 proceeds to step 311 of displaying the illuminance value of the surface of the display unit extracted in step 310 as the illuminance value of the place where the mobile terminal is currently located.

In step 311, the controller 110 not only controls the mobile terminal to display the illuminance value of the current location, but also information on the illuminance value required to perform the type of reading light and work environment selected by the user. Alternatively, it is possible to display the illuminance value information required at the current position to perform the type of the work environment selected by the user.

For example, when a work environment called reading is selected by a user, the controller 110 compares an illuminance value extracted in the illuminance measurement mode with an illuminance value required for a work environment called reading, and the extracted illuminance value is read. If it is determined that the illuminance value is smaller than that required for the work environment, the message "Location of 20 lux is low for reading in a place where a local user is located" may be displayed.

In the above description of the present invention, a specific embodiment such as a mobile terminal has been described, but various modifications may be made without departing from the scope of the present invention. Therefore, the scope of the present invention should not be defined by the described embodiments, but should be determined by the equivalent of claims and claims.

1 is a block diagram of a mobile terminal according to an embodiment of the present invention.

2 is a flowchart illustrating a process of measuring illuminance in a mobile terminal according to a first embodiment of the present invention.

3 is a flowchart illustrating a process of measuring illuminance in a mobile terminal according to a second embodiment of the present invention.

Claims (14)

In the illuminance measuring device of a mobile terminal, A display unit composed of a semi-transmissive LCD including a backlight LED and a reflector; In the illuminance measurement mode, if the brightness value of the backlight LED light B is greater than the brightness value of the external light A reflected through the reflector, the surface roughness value of the display unit corresponding to the current amount of the backlight LED light B is carried. And a control unit for controlling the terminal to extract the illuminance value of the place where the terminal is located. According to claim 1, And a memory including a table in which a current amount of the backlight LED light and a surface roughness value of the display unit corresponding to the current range are stored. The method of claim 1, wherein the control unit When the brightness value of the backlight LED light B is greater than the brightness value of the external light A in the illuminance measurement mode, the display unit is displayed in a color corresponding to the backlight LED light B, and the backlight LED light ( And if the brightness value of B) is smaller than the brightness value of the external light (A), controlling the brightness value of the backlight LED light (B) to increase. The method of claim 3, wherein the control unit If the brightness value of the backlight LED light (B) is smaller than the brightness value of the external light (A), the illumination of the mobile terminal, characterized in that the control to display the display unit in a color corresponding to the external light (A) Measuring device. The method of claim 1, wherein the control unit When the brightness value of the backlight LED light B is greater than the brightness value of the external light A, when the illuminance measurement is selected by the user, the current amount of the backlight LED light B is measured and corresponding to the measured current amount And a surface roughness value of the display unit to be extracted from a memory. The method of claim 1, wherein the control unit When the automatic flash setting is selected in the shooting mode, the camera switches to the illuminance measurement mode and controls to set the flash on / off by comparing the extracted illuminance value with the reference illuminance value in the illuminance measurement mode. Roughness measuring device. The method of claim 1, wherein the control unit When the ambient light intensity measurement mode is selected in the portable terminal, the illumination intensity measurement apparatus of the mobile terminal, characterized in that the control to switch to the light intensity measurement mode to display the extracted illuminance value. In the illuminance measuring method of the mobile terminal, Comparing the brightness value of the backlight LED light A of the display unit with the brightness value of the external light B reflected through the reflector of the display unit in the illuminance measurement mode; Measuring a current amount of the backlight LED light when the brightness value of the backlight LED light A is greater than the brightness value of the external light B; And extracting a surface roughness value of the display unit corresponding to the measured amount of current of the backlight LED light. The method of claim 8, And if the brightness value of the backlight LED light B is greater than the brightness value of the external light A, displaying the display unit in a color corresponding to the backlight LED light B. Method of measuring illuminance of the terminal. The method of claim 8, And if the brightness value of the backlight LED light (B) is smaller than the brightness value of the external light (A), further comprising increasing the brightness value of the backlight LED light. The method of claim 10, If the brightness value of the backlight LED light (B) is less than the brightness value of the external light (A), the mobile terminal further comprising the step of displaying the display unit in a color corresponding to the external light (A) How to measure illuminance The method of claim 8, When the illuminance measurement is selected by the user when the brightness value of the backlight LED light (A) is greater than the brightness value of the external light (B), illuminance measurement of the portable terminal, characterized in that for measuring the current amount of the backlight LED light Way. The method of claim 8, When the flash auto setting is selected in the shooting mode, the process of switching to the illuminance measuring mode; Comparing the extracted illuminance value with a reference illuminance value in the illuminance measurement mode; And setting the flash on when the extracted illuminance value is smaller than the reference illuminance value, and setting the flash off when the extracted illuminance value is larger than the reference illuminance value. The method of claim 8, When the ambient light intensity measurement mode is selected in the portable terminal, switching to the light intensity measurement mode; And displaying the extracted illuminance value in the illuminance measurement mode.
KR1020070081260A 2007-08-13 2007-08-13 Device and method for measuring illumination in wireless terminal KR20090016920A (en)

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KR1020070081260A KR20090016920A (en) 2007-08-13 2007-08-13 Device and method for measuring illumination in wireless terminal

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015105232A1 (en) * 2014-01-13 2015-07-16 엘지전자 주식회사 Mobile terminal

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015105232A1 (en) * 2014-01-13 2015-07-16 엘지전자 주식회사 Mobile terminal
KR20150084159A (en) * 2014-01-13 2015-07-22 엘지전자 주식회사 Mobile terminal

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