WO2002043042A1

WO2002043042A1 - Electronic device having displaying function

Info

Publication number: WO2002043042A1
Application number: PCT/JP2001/010100
Authority: WO
Inventors: Takeshi Ikeda; Hiroshi Miyagi
Original assignee: Niigata Seimitsu Co., Ltd.
Priority date: 2000-11-22
Filing date: 2001-11-19
Publication date: 2002-05-30
Also published as: JP2002162935A

Abstract

By using light-emitting diodes (11) capable of emitting light sufficiently even with a low voltage of a cell as a display unit for displaying various settings of a device, a display driver (9) packaged in an IC chip (10) is not required to have no booster circuit such as a DC-DC converter, so that output noise can be suppressed to exert no adverse effect on other function blocks (1 to 8) in the IC chip (10).

Description

Electronic equipment with display function Technical field

The present invention relates to an electronic device having a display function, and is particularly suitable for use in an electronic device in which a display driver is integrated with other functional blocks in a single chip. Background art

In recent years, development of electronic devices such as radio receivers, mobile phone devices, and PDA (Personal Digital Assistants) has been progressing at a rapid pace to make the devices smaller and thinner. In this context, with the rapid development of semiconductor integrated circuit integration technology, an LSI has been developed in which multiple function processing circuits such as tuners, decoders, and amplifiers for wireless communication are integrated on a single chip. ing.

In recent years, the progress of integration technology has been remarkable, and it is expected that more function processing circuits will be integrated on a single chip in the future. In addition, a display driver that drives a display device that displays the operating status of electronic equipment (in the case of a radio receiver, for example, reception frequency and volume level, etc.) and informs the user, etc., is also included in one chip. It is expected that it will be composed collectively.

At present, most portable electronic devices use a liquid crystal display (LCD) that can display a large amount of information such as characters, symbols, and graphics on the display screen. LCDs are expected to be used. Therefore, the display driver mounted on the chip in that case is It is an LCD driver.

However, when a liquid crystal driver is integrated in one chip in a portable electronic device, the LCD can emit sufficient light even when the device is used with a low-voltage battery compared to an AC power supply. In addition, it is necessary to increase the DC voltage of the battery using a DC-DC converter. However, when a DC-DC converter is used, there is a problem that large output noise is generated.

If the LCD driver is integrated on a single chip with other functional blocks such as a tuner, decoder, and amplifier, the output noise of the DC-DC converter will have a significant effect on other functional blocks, causing malfunctions. It is not preferable because it causes rubbing.

Therefore, the present invention suppresses the influence of output noise from the display driver to other functional blocks and integrates various operating states of the electronic device when the display driver is integrated with other functional blocks in one chip. The purpose is to make it easy to understand.

Another object of the present invention is to make it possible to display a large amount of information with as few parts as possible. Disclosure of the invention

An electronic device having a display function according to the present invention includes, in one chip, one or more function processing circuits for realizing a predetermined function and a display drive circuit for driving a display device for displaying various information. An electronic device mounted on the electronic device, wherein a plurality of light emitting diodes are used as the display device, and the various information is displayed in different light emitting modes of the plurality of light emitting diodes.

In another aspect of the invention, the electronic device is a radio receiver, When the reception frequency is displayed as one of the kind information, a predetermined number of light-emitting diodes at predetermined positions according to the reception frequency among the plurality of light-emitting diodes should emit light. It is characterized by having done. According to another aspect of the present invention, the electronic device is a radio receiver, and when displaying the volume as one of the various information, the electronic device is determined in advance according to the volume of the plurality of light emitting diodes. It is characterized in that a predetermined number of light emitting diodes emit light.

According to another aspect of the present invention, the electronic device is a radio receiver, and when displaying a preset number as one of the above-mentioned various information, the electronic device corresponds to the preset number of the plurality of light emitting diodes. In this way, one light emitting diode at a predetermined position emits light.

In another aspect of the present invention, the electronic device is a radio receiver, and when displaying a reception frequency as one of the above-described various types of information, the electronic device is previously determined according to the reception frequency among the plurality of light emitting diodes. When a plurality of light emitting diodes at predetermined positions emit light and the volume is displayed as one of the above various information, a predetermined one of the plurality of light emitting diodes is determined according to the volume. When a preset number is displayed as one of the various types of information by causing the number of light emitting diodes to emit light, one of the plurality of light emitting diodes is located at a predetermined position according to the preset number. It is characterized in that the light emitting diodes emit light.

Another aspect of the present invention is characterized in that the light emitting diode emits light for a predetermined time when an operation for setting arbitrary information among the various information is performed.

In another aspect of the present invention, a power-on state of the electronic device is displayed. In this case, one or more light emitting diodes at predetermined positions among the plurality of light emitting diodes are made to emit light at all times.

In this case, a current to be supplied to one or more light emitting diodes at the predetermined position to display the power-on state is supplied to display a state other than the power-on state. It may be made smaller than the current.

According to another aspect of the present invention, there are provided at least one function processing circuit for realizing a predetermined function, a display driving circuit for driving a plurality of light emitting diodes for displaying various information, and It is characterized by including a semiconductor chip mounted with a control circuit for controlling the display drive circuit so as to display a plurality of light emitting diodes in different light emitting modes.

According to the present invention configured as described above, a light emitting diode capable of sufficiently emitting light even at a low voltage of a battery is used as a display device. Therefore, a booster circuit such as a DC-DC converter is provided in a semiconductor chip. Therefore, it is possible to suppress the occurrence of output noise and the adverse effect on other function processing circuits in the chip.

In addition, since various information (various operating states of electronic devices, etc.) are displayed in different display modes using several light-emitting diodes, various types of information are displayed in an easy-to-understand manner with as few light-emitting diodes as possible. be able to. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a block diagram showing a chip configuration of a radio receiver implementing an electronic device having a display function according to the present invention.

FIG. 2 is a diagram illustrating a display example of a reception frequency band. FIG. 3 is a diagram showing a display example of a poly-time level.

FIG. 4 is a diagram showing a display example of a preset number.

FIG. 5 is a flowchart illustrating an operation example of the control circuit. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

As shown in FIG. 1, the radio receiver according to the present embodiment includes an IC chip 10 in which a plurality of functional blocks are collectively integrated. The multiple functional blocks of this IC chip 10 include an FM tuner 1, an FM stereo decoder 2, an AM tuner 3, a polymer 4, a power amplifier 5, a synthesizer 6, a crystal oscillator (〇SC) 7, and a control circuit. 8 and display driver 9.

Note that the chip configuration shown here is merely an example, and the present invention is not limited to this. That is, any device provided with at least the display driver 9 in the IC chip 10 is included in the scope of the present invention. Hereinafter, each of the functional blocks 1 to 9 in the IC chip 10 will be briefly described.

FM tuner 1 receives FM broadcast signals that use the frequency bands of 76 MHz to 90 MHz (Japanese bands) and 87.5 MHz to 108 MHz (U.S. and European bands). Is what you do. The FM stereo decoder 2 decodes the FM broadcast signal received by the FM tuner 1 and converts it into a stereo audio frequency signal. The AM tuner 3 receives an AM broadcast signal using the frequency band of long wave 1553 K: ~ 279 KHz, and medium wave 5330 K: ~ 171 KHz. The poly unit 4 adjusts the volume when outputting the FM broadcast or AM broadcast sound. The power amplifier 5 amplifies and outputs the audio signal of the FM broadcast or AM broadcast whose volume has been adjusted. The audio signal output from the power amplifier 5 is emitted from a speaker, a speaker, or the like (not shown). The synthesizer 6 performs a process of selecting a target frequency to be received by the FM tuner 1 and the AM tuner 3.

The crystal oscillator 7 generates a reference clock used in each functional block in the IC chip 10. The control circuit 8 controls the operation of each functional block in the IC chip 10. When the user operates various operation keys (not shown) provided in the radio receiver, the operation signals are first supplied to the control circuit 8, from which necessary commands are sent to each functional block.

The display driver 9 is a drive circuit that performs display control of a display device connected to the IC chip 10. In the present embodiment, n (n is an arbitrary natural number of 2 or more) LEDs (light emitting diodes) 11 are used as the display device. The display driver 9 uses the plurality of light-emitting diodes 11 to make it easy for the user to understand the various operating states of the radio receiver (reception frequency, poly-level, preset number, power ON / OFF, etc.). indicate. Hereinafter, this display control will be described in detail.

For example, when the reception frequency of the FM broadcast is presented to the user, two light emitting diodes located at positions corresponding to the reception frequency out of the n light emitting diodes 11 emit light. That is, the frequency band of 76 MHz to 90 MHz is divided into k (for example, k = 10), and two light emitting diodes that emit light are determined for each divided frequency band.

That is, the frequency band of the above-mentioned FM broadcast is set to 76.0 M to 77.4 MHz. , 77.5 MHz to 78.8 MHz, "-, 88.6 MHz to 90.0 MHz, divided into 10 frequency bands for each 1.4 MHz bandwidth Then, when the user selects the first divided frequency band (76.0 MHz to 77.4 MHz) as the reception frequency, as shown in FIG. LED 1 and LED 2 emit light.

When the user selects the second divided frequency band (77.5 MHz to 78.8 MHz), as shown in Fig. 2 (b), the state shown in Fig. 2 (a) is changed. The two light emitting diodes LED 2 and LED 3 shifted to the right by one light are emitted. Similarly, each time the selected reception frequency band increases, the two LEDs that emit light are shifted one by one to the right. Then, when the user selects the last divided frequency band (88.6 M to 90.0 MHz), the last two light emitting diodes LEDn-1 and LEDn emit light. Note that when k = 10, n = ll.

In this way, by causing the two LEDs at predetermined positions to emit light in accordance with the reception frequency selected by the key operation by the user, the user can determine which of the n light emitting diodes 11 By checking whether the individual is emitting light, the selected receiving frequency band can be visually confirmed.

Similarly, when presenting the AM broadcast reception frequency to the user, the frequency band of 153K to 2797ΚΗ, 53OK: to 1771Ο is divided into k bands, and each band is divided. Determine two LEDs that emit light for the frequency band. Then, two LEDs at predetermined positions are emitted according to the reception frequency selected by the user.

In this configuration, it is possible to check the reception frequency band by looking at the two LEDs that emit light, but is it the FM broadcast reception frequency band or the AM broadcast reception frequency? It is indistinguishable from obi. There In order to be able to distinguish between them, it is preferable to make the display mode different between FM broadcast and AM broadcast. For example, if the display is lit for FM broadcasts and blinks for AM broadcasts, the two can be clearly distinguished.

In addition, two LEDs for FM broadcasting and three LEDs for AM broadcasting are displayed according to the reception frequency, and two consecutive LEDs for FM broadcasting. In the case of LED and AM broadcasting, it is possible to consider a mode in which two LEDs, one at a time, are displayed according to the reception frequency. Of course, any other display mode is applicable provided that a distinction is made between FM broadcast and AM broadcast.

Also, when presenting the poly-level to the user, among the n light-emitting diodes 11, 1 to n light-emitting diodes are grouped to emit light according to the set volume size. . For example, the range from the minimum volume to the maximum volume is divided into m (for example, m = n = l1), and the number of light-emitting diodes that emit light continuously from the left is determined for each divided range. deep.

That is, when the user selects silence (volume = 0), none of the light emitting diodes LED1 to LEDn emit light as shown in FIG. 3 (a). When the user selects the minimum volume, the leftmost light emitting diode LED1 is made to emit light as shown in FIG. 3 (b). When the user selects the next largest volume, the two light-emitting diodes LED1 and LED2 that are continuous from the leftmost are emitted as shown in Fig. 3 (c).

In addition, when the user selects the next larger lens, as shown in Fig. 3 (d), the three light emitting diodes LED1, LED2, and LED3, which are consecutive from the left, emit light. Let it. In the same way, Each time the polyum level increases, the number of LEDs that emit light is increased by one. When the user selects the maximum volume level, all the light emitting diodes LED1 to LEDn emit light.

In this way, the user can make the setting by seeing how many LEDs are emitting by emitting a predetermined number of LEDs according to the polysilicon level set by the user's key operation. You can visually check the volume level.

When presenting the preset number to the user, one of the n light emitting diodes 11 at the position corresponding to the designated preset number is made to emit light.

That is, in the radio receiver according to the present embodiment, the FMAM band distinction, reception frequency, and various setting states of the poly-um level are registered in the memory in association with one preset number, and the user can select the desired setting. By simply specifying a preset number, the corresponding band, reception frequency, and program level can be set automatically and collectively. The number of sets of setting states that can be registered in the preset memory is n, the same as the number of light emitting diodes 11, and the preset numbers and the numbers of the light emitting diodes 11 correspond one-to-one. For example, when the user selects preset number # 3, as shown in FIG. 4, the third light emitting diode LED3 from the left emits light.

In this way, by illuminating one LED at a predetermined position in accordance with the preset number selected by the key operation by the user, the user can see which LED is illuminating. The selected preset number can be visually confirmed.

Also, when presenting the power supply {NZ} FF or the like to the user, at least one of the n light emitting diodes 11 1 It emits light in a mode different from the display mode of the frequency, poly level, and preset number. For example, when the power is turned off, all the light emitting diodes LED1 to LEDn are turned off, and when the power is turned on, the two light emitting diodes LED1 and LEDn at both ends are made to emit light.

As described above, in the present embodiment, various setting states such as a reception frequency, a volume level, a preset number, and a power supply ONZOF are displayed in a different manner using one set of the light emitting diodes 11. Like that. Thus, the user can clearly distinguish the current light emission content indicating the setting state of which function by seeing how the light emitting diode 11 emits light. it can.

In addition, since one set of light-emitting diodes 11 is used to indicate various setting states such as reception frequency, volume level, preset number, power ON / FF, all setting states are displayed simultaneously. It is not possible. Therefore, it is necessary to decide at what timing these settings are to be displayed. Although the present invention is not particularly limited in this respect, for example, the following embodiments can be considered.

That is, the two light-emitting diodes LED1 and LEDn indicating the power-on state are always turned on, and the other light-emitting diodes LED2 to LEDn-1 are usually turned off. Then, when a key operation for setting any of the reception frequency, the program level, and the preset number is performed, the light emitting diode 11 is operated for several seconds in the manner described with reference to FIGS. Emit light and then turn it off again. In this way, battery consumption can be suppressed.

In order to further reduce battery consumption, two light-emitting diodes, LED1 and LEDn, which indicate the power-on state, are supplied with a lower current than normal to make them light-emitting. good. Also, The status display of the source ON / OFF may not be performed (the LED that is always ON) may be eliminated.

Further, in another aspect, the status of the power supply NOFF is not displayed, and only the status of the reception frequency, the pause level, and the preset number is displayed. Then, at a certain point, if a key operation for setting any one of the reception frequency, the poly-um level, and the preset number is performed, the light-emitting diode 11 emits light in the manner described with reference to FIGS. The light emission state is maintained until the next key operation is performed. Then, when the next key operation is performed, the light emitting state of the light emitting diode 11 may be updated, and the light emitting state may be maintained until the next key operation is performed.

The control including the display switching of the light emitting diode 11 is performed by the control circuit 8 which receives a key operation from the user. FIG. 5 shows an operation flow of the control circuit 8. In FIG. 5, when the power of the radio receiver is turned on, first, an initial setting is performed in step S1. The initial setting mentioned here includes the process of resetting the operation state (reception frequency, poly level, etc.) that was set the last time the radio receiver was turned off.

Next, in step S2, the control circuit 8 outputs a predetermined command to the display driver 9 to notify the user that the power has been turned on to the two light emitting diode LEDs 1 at both ends. , LED n is made to emit light, for example. Next, in step S3, the control circuit 8 determines whether or not a key operation for selecting a reception frequency has been performed by the user.

If it is determined that such a key operation for tuning has been performed, the process proceeds to step S4, in which a predetermined command is output to the display driver 9, and the light emitting diode 1 is output in the manner shown in FIG. Flash 1 for a few seconds. Then, after the light emission for several seconds is completed, the light emitting diode 11 is turned off again to return to the original state in which only the light emitting diodes LED 1 and LED n for power are displayed. And go to step S5. On the other hand, if it is determined that the key operation for tuning has not been performed, the process jumps to step S5 without performing the process of step S4.

In step S5, the control circuit 8 determines whether or not a key operation for adjusting the poly-level has been performed by the user. Here, if it is determined that such a key operation for adjusting the volume has been performed, the process proceeds to step S6, where a predetermined command is output to the display driver 9, and the display driver 9 outputs the command in the manner shown in FIG. The light emitting diode 11 emits light for several seconds.

When the light emission for several seconds is completed, the light emitting diode 11 is turned off again to return to the original state in which only the power supply light emitting diodes LED 1 and LEDn are displayed, and the process proceeds to step S 7. On the other hand, if it is determined that the key operation for adjusting the volume has not been performed, the process jumps to step S7 without performing the process of step S6.

In step S7, the control circuit 8 determines whether a key operation for selecting a desired preset number has been performed by the user. Here, if it is determined that such a key operation for selecting a preset number has been performed, the process proceeds to step S8, in which a predetermined command is output to the display driver 9, and a command shown in FIG. In this embodiment, the light emitting diode 11 emits light for several seconds.

When the light emission for several seconds is completed, the light emitting diode 11 is turned off again to return to the original state in which only the light emitting diodes LED1 and LEDn are displayed, and the process returns to step S3. On the other hand, if it is determined that the key operation for preset number adjustment has not been performed, the process returns to step S3 without performing the process of step S8.

As described in detail above, according to the radio receiver of the present embodiment, since the light emitting diode 11 capable of sufficiently emitting light even with a low battery voltage is used as the display device, the display driver 9 is used as an IC chip. When built in 10 However, there is no need to mount a booster circuit like the DC-DC converter in the IC chip 10, and it suppresses the generation of output noise to reduce the other functional blocks 1 to 8 in the IC chip 10. Adverse effects on the environment can be suppressed.

According to the present embodiment, several light emitting diodes LED1 to LEDn are shared by a plurality of functions, and various operation setting states of the radio receiver are displayed in different display modes. Various operating states can be displayed in an easy-to-understand manner with a small number of light emitting diodes.

In the above embodiment, the radio receiver is described as an example of the electronic device. However, the present invention can be applied to other electronic devices. In particular, the present invention is suitable for a case where the present invention is applied to a portable electronic device, such as a mobile phone device and a PDA, which may be used on the go with a battery.

In addition, the embodiment described above is merely an example of the embodiment for carrying out the present invention, and the technical scope of the present invention should not be interpreted in a limited manner. is there. That is, the present invention can be embodied in various forms without departing from the spirit or main features thereof. Industrial applicability

The present invention suppresses the influence of output noise from the display driver to other functional blocks when the display driver is integrated with other functional blocks in one chip, and displays various operation states of electronic devices in an easily understandable manner. Useful to do. Further, the present invention is useful for displaying a large amount of information with as few parts as possible.

Claims

The scope of the claims

1. An electronic device in which one or more function processing circuits for realizing a predetermined function and a display driving circuit for driving a display device for displaying various information are mounted in one chip,

An electronic device having a display function, wherein a plurality of light emitting diodes are used as the display device, and the various kinds of information are displayed in different light emitting modes of the plurality of light emitting diodes.

2. The electronic device is a radio receiver, and when displaying the reception frequency as one of the various information, the electronic device is at a predetermined position among the plurality of light emitting diodes according to the reception frequency. 2. The electronic device having a display function according to claim 1, wherein a predetermined number of light emitting diodes emit light.

3. The electronic device is a radio receiver, and when displaying the volume as one of the various information, a predetermined number of light emitting diodes among the plurality of light emitting diodes are selected according to the volume. 2. The electronic device having a display function according to claim 1, wherein the electronic device emits light.

4. The above electronic device is a radio receiver, and when displaying a preset number as one of the above various information, the preset number is determined in advance according to the above preset number among the plurality of light emitting diodes. The electronic device having a display function according to claim 1, wherein one light-emitting diode at a position emits light.

5. The electronic device is a radio receiver, and when displaying the reception frequency as one of the various types of information, the electronic device is at a predetermined position among the plurality of light emitting diodes according to the reception frequency. Multiple light emitting diodes Flash

When displaying the volume as one of the above various information, a predetermined number of light emitting diodes are emitted according to the volume from among the plurality of light emitting diodes,

When a preset number is displayed as one of the above various information, one of the plurality of light emitting diodes should emit light at a position predetermined according to the preset number. An electronic device having a display function according to claim 1, wherein the electronic device has a display function.

6. The display according to claim 1, wherein the light emitting diode is caused to emit light for a predetermined time when an operation of setting any information among the above various information is performed. Electronic equipment with functions.

7. When displaying the power-on state of the electronic device, one or more light-emitting diodes at predetermined positions among the plurality of light-emitting diodes are made to always emit light. An electronic device having the display function according to claim 1.

8. The current supplied to the one or more light emitting diodes at the predetermined position for indicating the power-on state is higher than the current supplied for indicating a state other than the power-on state. The electronic device according to claim 7, wherein the electronic device is reduced in size.

9-one or more function processing circuits for realizing predetermined functions,

A display driving circuit for driving a plurality of light emitting diodes for displaying various information;

An electronic device having a display function, comprising: a semiconductor chip mounted with a control circuit for controlling the display drive circuit so as to display the various information in different light emission modes of the plurality of light emitting diodes.