JP2005129403A - Portable terminal apparatus, method of calibrating light quantity and light quantity calibrating program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a portable terminal apparatus for correcting a scatter of light quantity emitted from an LED at the time of incoming call and so on. <P>SOLUTION: The portable terminal apparatus including an LED capable of providing any luminous color by changing respective setting values of three colors, i.e. red, green and blue, comprises a standard setting value table for storing in advance standard setting values of the individual colors necessary to provide a predetermined luminous color; means for obtaining correction coefficients from the setting values of the individual colors when the preferred white is obtained by making the LED to emit light and the standard setting values and storing the correction coefficients; and means for obtaining the setting value for each of the colors by multiplying the correction coefficient to the setting value when the setting value of the preferred luminous color is designated. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a portable terminal device, a light amount calibration method, and a light amount calibration program that correct variations in the amount of light emitted from an LED that emits light when an incoming call is received.

With the spread of color liquid crystal displays in recent years, an increasing number of products are equipped with color liquid crystal displays in portable terminals. In this color liquid crystal display, a white LED using an indium gallium nitride material is generally used as backlight illumination (see, for example, Patent Document 1).
JP 2003-1000047 A

By the way, if white light can be lit on the back liquid crystal display provided in the portable terminal or the like, the use characters are widened because the lighting characters can be displayed vividly. Remain. Therefore, it is advantageous in terms of cost if white color can be displayed using the three-color LED already provided and used for the incoming lamp. The three color LEDs control the current flowing through the red, blue, and green light emitting diodes to produce each light intensity and each color, so that white lighting is possible by controlling the current flowing through each diode with a resistor.
However, since the resistance that controls the current flowing through the diode is a fixed value, if there is variation in LED parts, it will not be possible to emit accurate light intensity and color, and brightness and color unevenness will occur, requiring parts replacement. There is a problem of becoming. In addition, since it is not realistic to mount a resistor suitable for each component, there is a problem in that an LED with little variation must be purchased, and the unit price of the component becomes expensive. Further, since the set value is fixed even in the pulse waveform control, it cannot cope with the component variation. In addition, although it is possible to improve the variation of the number that can be set in several steps, it is left to the user, and it takes time and effort, and conversely, the color becomes far from the reference value. .

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a portable terminal device, a light amount calibration method, and a light amount calibration program that correct variations in the light amount of an LED that emits light when an incoming call is received.

  The invention according to claim 1 is a portable terminal device including an LED capable of obtaining an arbitrary emission color by changing set values of three colors of red, green, and blue, and having a predetermined emission color The standard setting value table in which the standard setting values of each color necessary for obtaining the color are stored in advance, and the correction coefficient from the setting value of each color and the standard setting value when the desired white color is obtained by emitting the LED And a means for obtaining a set value for each color by multiplying the set value by the correction coefficient when a set value for a desired emission color is designated. .

  The invention according to claim 2 is a light quantity calibration method in a mobile terminal device having three color LEDs of red, green, and blue, and standard setting values of each color necessary for obtaining a predetermined emission color are set as standard. A process of pre-stored in the value table, a process of obtaining a correction coefficient from the set value of each color when the LED emits light and obtaining a desired white color and the standard setting value, and storing the desired light emission And a step of obtaining a set value for each color by multiplying the set value by the correction coefficient when a set value for the color is designated.

  The invention described in claim 3 is a light quantity calibration program that operates on a mobile terminal device having three color LEDs of red, green, and blue, and each color standard necessary for obtaining a predetermined emission color. A process for preliminarily storing set values in a standard set value table, and a process for obtaining and storing correction coefficients from the set values of the respective colors and the standard set values when the LED emits light and a desired white color is obtained. When a set value of a desired emission color is designated, the computer is caused to perform a process of multiplying the set value by the correction coefficient to obtain a set value for each color.

  According to the present invention, since the variation in the amount of light of the LEDs can be eliminated, there is an effect that it is possible to eliminate the replacement of parts due to a malfunction during manufacturing. In addition, since the correction coefficient is obtained based on the measurement value for each individual, it is possible to perform calibration with a finished product attached with a cover or the like for the purpose of protecting the LED. In addition, since it is possible to calibrate even if LEDs with variations are purchased, an effect that the cost of parts can be reduced as a result is obtained.

  Hereinafter, a portable terminal device and a peripheral device according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the configuration of the embodiment. In this figure, reference numeral 1 denotes a mobile terminal. Reference numeral 11 denotes a control unit that controls blinking of the three-color LED 15. Reference numeral 12 denotes a memory for storing a correction coefficient for correcting the variation in light quantity. Reference numeral 13 denotes a PWM circuit that changes the amount of light emitted by each color LED by controlling the pulse width (duty ratio) output to each color LED, and is controlled independently for each color (red, green, blue). Is possible. Reference numeral 14 is a register that gives a setting to the PWM circuit 13 that controls the LEDs of each color, and has an independent register for each color. Reference numeral 15 denotes a three-color LED composed of LEDs of three colors of red, green, and blue to be calibrated. Reference numeral 16 denotes a connection unit for connecting and communicating with the personal computer 2 to which the spectroscopic measuring device 3 is connected.

  Here, the table structure of the memory 12 shown in FIG. 1 will be described with reference to FIG. FIG. 3 is a diagram showing a table structure in the memory 12. As shown in FIG. 3, the memory 12 includes a standard set value table (FIG. 3A), a light amount table (FIG. 3B), and a correction coefficient table (FIG. 3C). The standard setting value table is a table in which R, G, and B values are stored in advance when the desired color can be emitted using the three-color LED 15 used in the mobile terminal 1 of the same type. . The values of R, G, and B are values from 0 to 255. The larger the value is, the longer the time that is ON in one cycle. That is, if it is “0”, it is turned off, if it is “255”, it is kept lit (not turned off), and if it is “127”, the turn-on and turn-off times are almost the same.

The light amount table is a table in which values of light amounts I1, I2, and I3 obtained by the spectrophotometer when light is emitted in a desired white color are stored in advance.
The correction coefficient table is a table that stores correction coefficients obtained by processing to be described later. The correction coefficient is a value obtained by dividing (measured value) by (standard value), and three correction coefficients Rh, Gh, and Bh of R, G, and B are stored.

Next, the operation of the apparatus shown in FIG. 1 will be described with reference to FIG.
First, the control unit 11 sets a predetermined initial value (for example, 255, 255, 255) in the register 14 (step S1). As a result, the three-color LED emits light. At this time, the spectrometer 3 measures the amount of light of each wavelength (wavelength corresponding to each of red, green, and blue) of the emitting three-color LED, and outputs it to the personal computer 2. Subsequently, the personal computer 2 passes the output value of the spectrometer 3 to the control unit 11 via the connection unit 16 (step S2). In response to this, the control unit 11 determines whether or not the output value of the spectroscopic measuring instrument 3 has the same value as the desired white value (I1, I2, I3 stored in the light amount table) (step S3). . In this determination, a predetermined range (for example, ± 5%) is set for each color component, and all the color components are within this range (I1 ± 5%, I2 ± 5%, I3 ± 5%). Judgment is made based on whether or not it falls within the range.

  As a result of this determination, if the desired white color is not obtained, the control unit 11 changes the set value. For example, “1” is subtracted from any of the three set values set in the register 14. And it returns to step S2 and repeats a process. When the output value of the spectrophotometer 3 becomes the same value as the desired white color (a value within a predetermined range), the control unit 11 has three values (here, In this case, R0, G0, and B0 are held inside.

Next, the control unit 11 reads each white value (R1, G1, B1) of the standard set value table stored in the memory 12 in advance. Then, the control unit 11 obtains correction coefficients Rh, Gh, and Bh for each color by the following equation (step S5), and stores the obtained correction coefficients Rh, Gh, and Bh in the memory 12 as a correction coefficient table (step S6).
Rh = R0 (measured value) / R1 (standard value)
Gh = G0 / G1
Bh = B0 / B1

  By this operation, the correction coefficient for correcting the variation in the light amount due to the individual difference of each LED is stored in the memory 12. By multiplying the correction coefficient by an RGB value (values to be set for RGB, which should be set in the register 14) designated by an application operating on the portable terminal 1, 3 is obtained with a light amount whose variation is corrected. The color LED 15 can be turned on.

  The RGB value for each color to be emitted is stored in advance in the memory 12 in association with the color identification information, and when the color identification information is received from the application, the RGB value associated with the color identification information is stored. , And a value obtained by multiplying each RGB value by a correction coefficient may be set in the register 14.

  2 is recorded on a computer-readable recording medium, and the program recorded on the recording medium is read into a computer system and executed to execute a light quantity calibration process. May be performed. Here, the “computer system” includes an OS and hardware such as peripheral devices. The “computer system” includes a WWW system having a homepage providing environment (or display environment). The “computer-readable recording medium” refers to a storage device such as a flexible medium, a magneto-optical disk, a portable medium such as a ROM and a CD-ROM, and a hard disk incorporated in a computer system. Further, the “computer-readable recording medium” refers to a volatile memory (RAM) in a computer system that becomes a server or a client when a program is transmitted via a network such as the Internet or a communication line such as a telephone line. In addition, those holding programs for a certain period of time are also included.

  The program may be transmitted from a computer system storing the program in a storage device or the like to another computer system via a transmission medium or by a transmission wave in the transmission medium. Here, the “transmission medium” for transmitting the program refers to a medium having a function of transmitting information, such as a network (communication network) such as the Internet or a communication line (communication line) such as a telephone line. The program may be for realizing a part of the functions described above. Furthermore, what can implement | achieve the function mentioned above in combination with the program already recorded on the computer system, and what is called a difference file (difference program) may be sufficient.

It is a block diagram which shows the structure of one Embodiment of this invention. It is a flowchart which shows operation | movement of the apparatus shown in FIG. It is explanatory drawing which shows the table structure of the memory 12 shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Portable terminal 11 ... Control part 12 ... Memory 13 ... PWM circuit 14 ... Register 15 ... 3-color LED
16 ... Connection 2 ... PC 3 ... Spectrometer

Claims (3)

A portable terminal device including an LED capable of obtaining an arbitrary emission color by changing the set values of each of the three colors of red, green, and blue,
A standard setting value table in which standard setting values of each color necessary for obtaining a predetermined emission color are stored in advance;
Means for obtaining and storing a correction coefficient from the set value of each color when the LED emits light and obtaining a desired white color and the standard set value;
A portable terminal device comprising: means for obtaining a set value of each color by multiplying the set value by the correction coefficient when a set value of a desired emission color is designated. A light amount calibration method in a mobile terminal device including three color LEDs of red, green, and blue,
A process of previously storing standard setting values of each color necessary for obtaining a predetermined emission color in a standard setting value table;
A process of obtaining and storing a correction coefficient from the set value of each color when the LED emits light and obtaining a desired white color and the standard set value;
And a step of multiplying the set value by the correction coefficient to obtain a set value of each color when a set value of a desired emission color is designated. A light amount calibration program that operates on a mobile terminal device having three color LEDs of red, green, and blue,
A process of storing in advance a standard setting value table for each color necessary for obtaining a predetermined emission color in a standard setting value table;
A process of obtaining and storing a correction coefficient from the set value of each color when the LED emits light and obtaining a desired white color and the standard set value;
A light quantity calibration program for causing a computer to perform a process of obtaining a set value of each color by multiplying the set value by the correction coefficient when a set value of a desired emission color is designated.

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