KR100597154B1 - Luminescence device and electronic device having the luminescence device - Google Patents

Abstract

The present invention reduces fluctuations in emission color between a plurality of light emitting modules without causing complicated circuit configuration, enlargement, or increase in current consumption. In the case where the light emitting modules 40L and 40R are simultaneously driven to produce mixed color light emission, the light emission pattern is devised so that the variation of the light emission color between the light emitting modules is inconspicuous. For example, light is emitted in a single color and then shifted to mixed color light. In addition, in the case of changing the ratio of mixed colors, after fixing the light emission luminance of the LED emitting light of the base color, the light emission luminance of the other LEDs is changed step by step. Set it. The upper limit is set for the mixed color light emission time by the same brightness, and the shorter the whole light emission period from the start of the mixed color light emission to the end as the mixed light emission time with the same brightness is longer.

Luminous Intensity, Antenna, LED Driver ICs

Description

LUMINESCENCE DEVICE AND ELECTRONIC DEVICE HAVING THE LUMINESCENCE DEVICE}

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is an exploded perspective view showing the appearance of a mobile phone terminal which is an embodiment of an electronic apparatus having a light emitting device according to the present invention.

2 is a plan view from above of the mobile telephone terminal shown in FIG. 1;

3 is a block diagram showing a circuit configuration of the mobile telephone terminal shown in FIG.

FIG. 4 is a diagram showing a circuit configuration of a light emitting device portion which is a main part of the mobile telephone terminal shown in FIG.

FIG. 5 is a flowchart showing control procedures and control contents of a light emission control program included in the mobile phone terminal shown in FIG. 3; FIG.

FIG. 6 is a diagram showing an example of a light emission control pattern included in the mobile phone terminal shown in FIG. 3; FIG.

<Explanation of symbols for the main parts of the drawings>

1: antenna

2: antenna common unit (DUP)

3: receiving circuit (RX)

4: Frequency Synthesizer (SYN)

5: Transmission circuit (TX)

6, 12: A / D converter

7: Digital demodulation circuit (DEM)

8: Time Division Multiple Access Circuit (TDMA)

9: Error Correction Code Decoding Circuit (CH-COD)

10: Speech code decoding circuit (SP-COD)

11, 16: D / A converter

13: speaker

14: microphone

15: Digital Modulation Circuit (MOD)

17: battery

18: power supply circuit (POW)

20: control circuit

20a: light emission control program

21: input unit

22: display unit

23: memory (MEM)

30: light emitting drive circuit

31: LED Driver IC

32L, 32R: Module Selector Switch

33r, 33b, 33g: LED Selection Switch

40L, 40R: Light Emitting Module

50 light guide plate

100: lower casing

200: upper casing

300: back panel

The present invention provides, for example, a light emitting device that performs two-dimensional mixed color light emission by simultaneously driving a plurality of light emitting modules having three light emitting elements of red, blue, and green, and a mobile phone terminal provided with the light emitting device. And electronic devices such as a personal computer and an audio video player.

In recent years, for example, a model for realizing an illumination function has been developed in a portable telephone terminal by providing a light emitting device. For example, a light emitting module having three colors of light emitting diodes (LEDs) is disposed on a casing surface, and the light emitting module drives light emission according to light emission patterns corresponding to various event functions such as incoming calls, calls, and execution of applications. . In this way, the maker or the telecommunication service provider has the advantage that different illuminations can be differentiated by various illuminations, while the user can visually identify a plurality of event functions by illuminations.

In general, however, light emitting modules have variations in light emission characteristics such as light emission color and light emission luminance. For this reason, for example, when two-dimensional mixed color light emission is to be performed using a plurality of light emitting modules, the beauty of illumination decreases due to variations in light emission characteristics between light emitting modules, and the desired illumination expression cannot be realized. The problem arises that identification of the event becomes difficult.

On the other hand, as a technique for correcting the variation in luminance between LEDs of a light emitting module, a different driving circuit is formed for each LED (especially in a blue LED), and the variation of the luminance between LEDs is started by individually starting the LEDs by these different driving circuits. It is proposed to reduce the pressure (see Patent Document 1, for example).

Patent Document 1: Japanese Patent Laid-Open No. 7-129100

However, such a conventional correction technique requires the preparation of a plurality of different driving circuits, which results in a complicated and large circuit configuration, resulting in an increase in the cost of the apparatus. It also causes an increase in current consumption. This is a great obstacle in achieving small size, light weight, and low current consumption of a battery-powered small electronic device such as a cellular phone terminal, which is very undesirable.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object thereof is to reduce variations in emission colors between a plurality of light emitting modules without causing complicated circuit configuration, enlargement, or increase in current consumption. An object of the present invention is to provide a light emitting device and an electronic device having a light emitting device that can enhance the aesthetics and maintain a high discrimination of an event.

In order to achieve the above object, the present invention provides a light emitting device comprising a plurality of light emitting modules having a plurality of light emitting elements having different light emission colors, and a light emission control unit for causing two-dimensional mixed color light emission by simultaneously driving the plurality of light emitting modules. As the device, in the light emission control unit, in the case where the respective light emitting modules emit light of a mixed color, the plurality of light emitting elements constituting the light emitting module are controlled to sequentially emit light or terminate light emission at a predetermined time difference.

Therefore, according to the present invention, the light emission color is changed from a single color to a mixed color sequentially, so that even if there is a change in light emission characteristics between a plurality of light emitting modules, it is possible to make the light emission color fluctuate between the two modules inconspicuous. . Furthermore, since the variation of the emission color is reduced by the design of the light emission pattern, there is no need to provide a different driving circuit for each light emitting element, and thus there is no fear of complicated or large circuit configuration, increased cost, and increased current consumption. This is very useful in battery-powered small electronic devices such as mobile phone terminals.

In addition, the present invention is to control to change the light emission luminance of the first light emitting element, and to change the light emission luminance of the second light emitting element in steps when each light emitting module changes the ratio of the mixed color in the state that the light emission of the mixed light It features. In this way, the ratio of the mixed color when the mixed color light emission is performed, that is, the color changes under a certain rule, so that the variation of the color between the two modules during the mixed color light emission can be made less noticeable.

In particular, when the light emission luminance of the second light emitting element is changed step by step, if the amount of change per unit time is controlled to be within a preset value, the color of light emission changes smoothly, thereby reducing the discomfort of color change.

In addition, the present invention provides the normal period when each light emitting module is controlled to emit light in accordance with a normal period of mixed color emission at the same luminance, and a light emission pattern having a brightness increasing period and a brightness decreasing period set before and after the normal period. If it is set to 1 hour, the total time between the normal period, the luminance increase period, and the luminance decrease period is set to a second time, and if the normal period is set to a third time longer than the first time, The total time between the normal period, the luminance increase period, and the luminance decrease period is set to a fourth time shorter than the second time.

That is, the longer the length of the period of mixed color light emission at the same brightness, the light emission pattern is set so that the entire light emission period from the start of the mixed color light emission to the end is shortened. When the respective light emitting modules are driven in accordance with such a light emission pattern, when the period of mixed color light emission at the same brightness is long, the period of increase and decrease of brightness before and after the operation is shortened, so that the change in brightness is quicker. You can make the color change in the eye less noticeable.

<Example>

1 is an exploded perspective view showing the appearance of a portable telephone terminal which is an embodiment of an electronic apparatus having a light emitting device according to the present invention, and FIG. 2 is a plan view of the mobile telephone terminal viewed from above. This mobile phone terminal is a so-called folding terminal which combines the lower casing 100 and the upper casing 200 so as to be rotatable by a hinge mechanism.

The U-shaped light guide plate 50 is provided on the back of the upper casing 200 of the mobile phone terminal, and light emitting modules 40L and 40R are provided at both ends of the light guide plate 50, respectively. The light emitting modules 40L and 40R are formed by modularizing a red LED, a blue LED, and a green LED as a group. The light guide plate 50 is made of resin having light guide properties such as polycarbonate or acrylic. Reference numeral 201 denotes a sub display, reference numeral 202 denotes a camera, and reference numeral 300 denotes a rear cover made of a material having translucency.

3 is a block diagram showing the circuit configuration of the mobile telephone terminal according to this embodiment.

In FIG. 3, a radio signal transmitted through a radio channel from a base station (not shown) is received by the antenna 1 and then input to the reception circuit RX 3 through the antenna common unit DUP 2. In this reception circuit 3, the received radio signal is mixed with a reception local oscillation signal output from the frequency synthesizer SYN 4 and frequency converted into a reception intermediate frequency signal. The received intermediate frequency signal is sampled by an analog-to-digital (A / D) converter 6 including a low pass filter and then input to a digital demodulation circuit (DEM) 7.

In the digital demodulation circuit 7, the digital demodulation process is performed after frame synchronization and bit synchronization with respect to the digital reception intermediate frequency signal are established. The digital demodulation signal of the band band obtained by this demodulation process is input to a time division multiple access circuit (TDMA) 8, where time slots forward to the respective frames are separately extracted for each transmission frame. The control circuit 20 is notified of the information of the frame synchronization and the bit synchronization obtained by the digital demodulation circuit 7.

The digital demodulation signal output from the TDMA circuit 8 is subsequently input to an error correction code decoding circuit (CH-COD) 9, where error correction decoding processing is performed. The error correction decoded digital demodulation signal includes information data such as mail and voice and voice data according to the communication mode at that time. Among them, the speech voice data is input to the speech code decoding circuit (SP-COD) 10 to perform voice decoding processing, thereby reproducing a digital sign signal. This digital sign signal is returned to an analog sign signal from a digital / analog (D / A) converter 11 and then input to a sign amplifier (not shown), which is amplified and supplied to a speaker 13 as a hand receiver to be amplified output. do. In addition, information data such as a received mail or received download data is acquired by the control circuit 20, stored in the memory MEM 23 by the control circuit 20, and decoded and displayed on the display unit 22. do.

On the other hand, the talker's voice is picked up by the microphone 14 and converted into a talk signal, and amplified to a predetermined level by a talk amplifier (not shown) and then input to the A / D converter 12. The A / D converter 19 is sampled at a predetermined sampling period, thereby converting it into a digital talk signal composed of a sample pulse train. After the acoustic echo is canceled by an echo canceller (not shown), the digital talk signal is input to the speech code decoding circuit (SP-COD) 10, where the speech is encoded.

This speech coded digital transmitted signal is input to an error correction code decoding circuit (CH-COD) 9, where it is error corrected and encoded. In addition, information data such as image data and transmission mail output from the control circuit 20 are also input to the error correction code decoding circuit 9 and subjected to error correction coding. The digital transmission signal output from the error correction code decoding circuit 9 is input to the TDMA circuit 8. In the TDMA circuit 8, a transmission frame corresponding to a time division multiple access (TDMA) method is generated, and processing for inserting the digital transmission signal into a time slot allocated to the device of the transmission frame is performed.

The digital transmission signal output from the TDMA circuit 8 is subsequently input to the digital modulation circuit (MOD) 15. In the digital modulation circuit 15, a transmission intermediate frequency signal digitally modulated by the digital transmission signal is generated, and this transmission intermediate frequency signal is converted into an analog signal by the D / A converter 16 and then the transmission circuit TX (5). As the digital modulation scheme, for example, a π / 4 shift DQPSK (differentially encoded quadrature phase shift keying) scheme is used.

In the transmission circuit 5, the modulated transmission intermediate frequency signal is mixed with the transmission local oscillation signal output from the frequency synthesizer 4, and is thus converted into a radio carrier frequency corresponding to the radio communication channel. Then, the transmission radio carrier signal is controlled at a predetermined transmission power level by a transmission power amplifier (not shown), and then transmitted from the antenna 1 to the base station (not shown) via the antenna common unit 2.

In addition, the key input unit 21 includes various keys necessary for communication such as a call key, an end key, a plurality of function keys, and a dial key. The display 22 uses a liquid crystal display (LCD), for example, and displays the display data output from the control circuit 20. The display data includes transmission / reception mail, image data, and the like, in addition to management data such as a telephone book and a transmission / reception history, data indicating an operation state of the apparatus. The power supply circuit 18 generates a power supply voltage Vcc necessary for the operation of each circuit of the cellular phone terminal based on the output voltage of the battery 17 made of the secondary battery.

The memory 23 is made of, for example, RAM or flash memory, and stores an e-mail or download data received from a phone book, a terminal of a communication partner or an information site, and is captured by the camera 202. Image data and the like are stored. The memory 23 also stores a plurality of light emission control data for controlling light emission operations of the light emitting modules 40L and 40R. Each light emission control data corresponds to any one of a plurality of event functions possessed by the cellular phone terminal. The light emission control data includes module selection data for designating which of the light emitting modules 40L and 40R are to be driven, and light emission control patterns for specifying light emission luminance and light emission time of each color LED constituting the light emitting modules 40L and 40R. Data is included.

By the way, the light emitting device portion is configured as follows. 4 is a block diagram showing the circuit configuration.

That is, the light emitting device unit is composed of two sets of light emitting modules 40L and 40R, a light emitting drive circuit 30 and a light emitting control program 20a executed by the control circuit 20. Among them, the light emitting drive circuit 30 includes an LED driver IC 31, module selection switches 32L and 32R, and LED selection switches 33r, 33b, and 33g.

The light emission control program 20a selectively reads out the light emission control data from the memory 23 corresponding to the event function executed in the cellular phone terminal. Then, the module selection data included in the read light emission control data is supplied to the module selection switches 32L and 32R of the light emission driving circuit 30, and the brightness control data for each light emission color specified by the light emission control pattern data. Is supplied to the LED driver IC 31 for a specified time.

The module selection switches 32L and 32R are in a conductive state or a non-conductive state according to the supplied module selection data, thereby selectively operating the light emitting modules 40L and 40R. As a selection form of the light emitting modules 40L and 40R, there are a form in which any one of the light emitting modules 40L and 40R are operated, and a form in which both of the light emitting modules 40L and 40R are operated simultaneously.

The LED driver IC 31 selectively supplies light emission drive pulses to the LED selection switches 33r, 33b, 33g according to the brightness control data supplied from the control circuit 20, and accordingly the light emitting modules 40L and 40R. Each color LED of) emits light individually at a specified brightness.

Next, the operation of the light emitting device constructed as described above will be described. 5 is a flowchart showing the control procedure and control contents of the light emission control program 20a.

In other words, when an event is started by the execution of an application program such as a game, for example, in the mobile phone terminal, the control circuit 20 proceeds from step 5a to step 5b, where it first determines the type of the event started. Subsequently, in step 5c, light emission control data corresponding to the type of the determined event is selectively read, and module selection data included in the read light emission control data is supplied to the module selection switches 32L and 32R. As a result, for example, the module selection switches 32L and 32R are both in a conducting state, whereby the light emitting modules 40L and 40R are both in an operable state.

At the same time, the control circuit 20 starts light emission control of each color LED according to the light emission control pattern data included in the read light emission control data. That is, in step 5d, the phases of the light emission control pattern are sequentially selected, and the luminance control data of the selected phases are output to the LED driver IC 31 (step 5e). In addition, the specified time is set to a timer, and the timer is started (step 5f). The timeout is monitored at step 5g, and the output of the luminance control data is terminated at the time point when the timeout is detected.

For example, in the first phase No. 1 of the emission control pattern shown in FIG. 6, luminance control data for causing the blue LED to emit light at the luminance level "20" is output, and a timer time of 40 msec is set and displayed. Is done. For this reason, in the LED driver IC 31 of the light emission drive circuit 30, the light emission drive pulse in which the duty ratio was specified by the said brightness control data is supplied to the LED selection switch 33b. As a result, the LED selection switch 33b is turned on and off in accordance with the duty ratio of the light emission drive pulses, and the blue LED starts emitting light. When the time period of 40 msec has elapsed, output of the brightness control data is stopped and light emission of the blue LED is stopped. Thus, in the first phase No. 1, only the blue LED emits light at the luminance level "20" for a period of 40 msec.

Subsequently, when the control proceeds to the second phase No. 2, the control circuit 20 emits the blue LED at the luminance level "20" and outputs luminance control data for causing the green LED to emit the luminance level "4". In addition, the timer is set to a time of 25 msec. For this reason, from the LED driver IC 31 of the light emission drive circuit 30, the light emission drive pulse for a blue LED and the light emission drive pulse for a green LED which the duty ratio was specified by the said brightness control data are respectively the LED selection switch 33b and It is supplied to the LED selector switch 33g. As a result, the LED selection switch 33b and the LED selection switch 33g respectively operate on and off in accordance with the duty ratio of each light emission drive pulse, whereby the blue LED and the green LED respectively start to emit light. When the time period of 25 msec has elapsed, the output of the brightness control data is stopped and light emission of the blue LED and the green LED is stopped. Thus, in the second phase No. 2, the blue LED and the green LED emit light of mixed colors for a period of 25 msec at luminance levels "20" and "4", respectively.

Likewise below, in step 5d, the following phases No. 3, No. 4,... Each time is selected, the control circuit 20 supplies the brightness control data specified in the phase to the LED driver IC 31 for the designated time in steps 5e to 5g. Accordingly, light emission drive pulses are selectively supplied from the LED driver IC 31 of the light emission drive circuit 30 to the LED selection switches 33b, 33g, 33r for a specified light emission time, and as a result, each color LED is designated. It emits monochromatic or mixed colors for a specified time as a ratio of luminance.

Thus, when the light emission control in the final phase No. 19 ends, the control circuit 20 detects this in step 5h and ends the series of light emission control according to the light emission control pattern. If the event is still continuing, the control circuit 20 returns to step 5b to repeatedly execute the light emission control described above.

By the way, as shown in Fig. 6, the light emission control pattern is prioritized like phase No. 1, No. 2, phase No. 8, No. 9, phase No. 13, No. 14 when starting mixed color light emission. It is set so as to emit monochromatic light and thereafter shift to mixed color light emission. In addition, even when the mixed color light emission is terminated, the light emission is set to finish the light emission through the single color from the mixed color as in phase No. 6, No. 7, Phase No. 11, No. 12, Phase No. 18 and No. 19. . For this reason, even if there is a fluctuation in the luminescence brightness between the light emitting modules 40L and 40R, for example, the fluctuation in the color mixture of the light emission between the light emitting modules 40L and 40R can be made inconspicuous.

In addition, when changing the ratio of mixed colors, the base color emits light as in phases Nos. 2 to 6, phases Nos. 9 to 11, and phases Nos. 14 to 18 shown in FIG. The light emission luminance of the LED is fixed (“20” in the example of FIG. 6), and the light emission luminance of the other LED is changed in steps. Moreover, when changing the said light emission luminance step by step, the upper limit ("4" in the example of FIG. 6) is set to the change amount per unit time. In this way, the ratio of the mixed color when the mixed color light emission is being performed gradually changes gradually step by step, thereby making it possible to make the variation of the color between the two light emitting modules 40L and 40R at the time of the mixed color light emission less noticeable. have.

In addition, as shown in phase No. 4 of Fig. 6, the maximum length of the mixed color emission time due to the same brightness is set to 100 msec, and further, the longer the color emission time due to the same brightness is, the total light emission period from the start of the mixed color emission to the end. The light emission pattern is set to be short.

For example, in phase No. 4 of FIG. 6, since the light emission time of the same brightness is long as 100 msec, the total length of the mixed color light emission periods of phase Nos. 2 to 6 including this phase No. 4 is set within 200 msec. do. In addition, when the light emission time of the same brightness is 80 msec, the total length of the mixed color light emission period including this phase is set within 320 msec.

On the other hand, when the light emission time of the same brightness is short as 60 msec like the phase No. 16 of FIG. 6, the total length of the mixed color light emission periods of phase Nos. 14 to No. 18 including this phase No. 16 is within 420 msec. Set long. In addition, when the light emission time of the same brightness is 40 msec or less, the upper limit of the entire length of the mixed color light emission period including this phase is set to 520 msec longer.

When each of the light emitting modules 40L and 40R is driven in accordance with such a light emission pattern, in the case where a long period of mixed color light emission with the same brightness is long, the increase and decrease periods of the start-up period and the brightness decrease period before and after that become short, so that the change in the brightness is quick. Fluctuations in color in the mixed light emission period of the same luminance can be made inconspicuous.

As described above, in this embodiment, light emission control pattern data having the following functions is created and stored in the memory 23. Then, the light emission control program 20a of the control circuit 20 reads light emission control pattern data corresponding to the event being executed from the memory 23, and emits light in accordance with the read light emission control pattern data. ), The light emitting modules 40L and 40R are allowed to emit mixed colors.

(1) In the case where the light emitting modules 40L and 40R are simultaneously driven to produce mixed color light emission, light emission is performed in a single color and then shifts to mixed color light emission. That is, a time difference is given to the light emission start timing and end timing between LEDs.

(2) In the case of changing the ratio of mixed colors, after fixing the light emission luminance of the LED emitting light of the base color, the light emission luminance of the other LEDs is to be changed step by step, and the amount of change in the brightness when the step is changed in steps Set the upper limit.

(3) An upper limit (for example, 100 msec) is set for the mixed color light emission time by the same brightness, and the shorter the entire light emission period from the start of mixed color light emission to the end is set as the mixed light emission time with the same brightness is longer.

Therefore, according to this embodiment, even when there is a variation in the light emission luminance between the light emitting modules 40L and 40R, it is possible to make the light color mixture between the light emitting modules 40L and 40R uneven. This is particularly effective when the light guide plate 50 is formed between each light emitting module 40L and 40R as shown in FIG. 1 and FIG. That is, when the light guide plate 50 is used, the light emission of each of the light emitting modules 40L and 40R is linear, that is, two-dimensional light emission, instead of point light emission. For this reason, if there is a fluctuation in the luminescence brightness between the light emitting modules 40L and 40R, the difference in the luminescence color due to this fluctuation is remarkably displayed on the light guide plate, which makes it difficult to recognize the luminescent color as well as deterioration of aesthetics. However, when the light emitting pattern is devised as in the present embodiment so that variation in the light mixing color between the light emitting modules 40L and 40R is not noticeable, two-dimensional mixed color light emission using the light guide plate 50 can be performed at high quality.

In addition, since the variation of the emission color is reduced by devising a light emission pattern, it is not necessary to provide a different driving circuit for each LED, thereby making it possible to prevent the complexity of the circuit configuration, increase in size, increase in cost, and increase in current consumption. . This is very useful for an electronic device such as a portable telephone terminal in which the weight reduction of the terminal and the extension of battery life are one of the important problems.

In addition, this invention is not limited to the said Example. For example, in the above embodiment, the case where two light emitting modules 40L and 40R are simultaneously driven has been described as an example. However, the present invention can also be applied to the case where three or more light emitting modules are driven by driving. The number of LEDs constituting the light emitting module may be two of red, blue, and green. In the above embodiment, the case where the mixed color light emission is performed by sequentially driving two color LEDs among the three color LEDs over time is illustrated as an example, but the three color LEDs may be sequentially mixed over time to cause the mixed color light emission. As the light emitting element, a lamp, a liquid crystal, an EL element, or the like can be used in addition to the LED.

The light emitting device according to the present invention is not only a mobile phone terminal, but also other communication terminal devices such as fixed phone terminals, facsimile terminals, personal computers, PDAs (Personal Digital Assistants), vehicle-mounted electronic devices such as car stereos, audio video players, and games. The present invention can also be applied to other electronic devices such as a device, a sales terminal device for a store, and an advertisement display device.

The present invention is not limited to the above embodiment, and the embodiment can be embodied by modifying the components within a range not departing from the gist of the embodiment. Further, various inventions can be formed by appropriate combinations of a plurality of components disclosed in the above embodiments. For example, some components may be deleted from all the components shown in the embodiments. Moreover, you may combine suitably the component which concerns on other embodiment.

According to the present invention, when the plurality of light emitting modules emit light in a mixed color, the light emitting elements constituting the light emitting module emit light or stop emitting light sequentially with a predetermined time difference, or when the ratio of the mixed colors is changed. The temporal and luminance levels are devised in the light emission pattern, such as by fixing the light emission luminance of the light emitting element and controlling the light emission luminance of the second light emitting element to be changed in stages.

Therefore, according to the present invention, variations in emission colors between a plurality of light emitting modules are reduced without complicated circuit configuration, enlargement, or increase in current consumption, thereby improving the aesthetics of illumination and maintaining high event discrimination. It is possible to provide a light emitting device and an electronic device having a light emitting device that make it possible to do so.

Claims (5)

A plurality of sets of light emitting modules having a plurality of light emitting elements having different light emitting colors, A light emission control unit which drives two-dimensional mixed color light emission by simultaneously driving the plurality of light emitting modules And The light emission control unit, And a plurality of light emitting elements constituting the light emitting module to sequentially emit light or terminate light emission with a predetermined time difference when the respective light emitting modules emit light of mixed colors. The method of claim 1, The light emission control unit, The light emitting device characterized by fixing the light emission luminance of a 1st light emitting element, and changing the light emission luminance of a 2nd light emitting element in steps, when each light emitting module changes the ratio of mixed colors in the state which mixed light emission is performed. The method of claim 2, The light emission control unit, And changing the amount of change per unit time within a predetermined value when the light emission luminance of the second light emitting element is changed step by step. The method according to any one of claims 1 to 3, The light emission control unit, When the respective light emitting modules are controlled to emit light in accordance with a light emission pattern having a normal period in which mixed color light emission is performed at the same luminance, and a luminance increase period and a luminance decrease period set before and after the normal period, the normal period is set to a first time period. In one case, the sum of the normal period, the luminance increase period, and the luminance decrease period is set to a second time, and when the normal period is set to a third time longer than the first time, the normal period and the luminance The total time of the increase period and the luminance decrease period is set to a fourth time shorter than the second time. The electronic apparatus body which selectively executes a plurality of event functions, Light emitting device installed in the main body of the electronic device And The light emitting device, A plurality of sets of light emitting modules having a plurality of light emitting elements having different light emitting colors, A light emission control unit for driving two or more sets of light emitting modules simultaneously in accordance with a light emission pattern corresponding to an event function executed by the electronic device main body to cause two-dimensional mixed color light emission representing the executed event function; The light emission control unit, And a plurality of light emitting elements constituting the light emitting module are sequentially started or terminated to emit light with a predetermined time difference when the respective light emitting modules emit light of mixed colors.

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