JPH11266295A - Device and method for displaying backlight of portable telephone set - Google Patents

Abstract

PROBLEM TO BE SOLVED: To set backlight in color that is preferred by a user and is easy to see by including plural pulse width modulator circuits which change the pulse width in a controlling means, inputting pulses outputted from plural pulse width modulator circuits to plural LED drive transistors and making plural light- emitting diodes emit light by outputs of the plural LED drive transistors. SOLUTION: An output of a 1st PWM circuit 3 of a control means 2 is connected to the base of a 1st LED drive transistor 6, the emitter of the transistor 6 is grounded and an output of the collector is connected to a 1st light- emitting diode 9 which emits light in red. Similarly, an output of a 2nd PWM circuit 4 is grounded to the emitter of a 2nd LED drive transistor 7 and an output of the collector is connected to a 2nd light-emitting diode 10 which emits light in green. An output of a 3rd PWM circuit 5 is grounded to the emitter of a 3rd LED drive transistor 8, and an output of the collector is connected to a diode which emits light in blue.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for selecting a display color of a backlight of a portable telephone.

[0002]

2. Description of the Related Art As a conventional device for checking the display of a backlight of a portable telephone, there is one disclosed in Japanese Patent Application Laid-Open No. 5-37620. This includes a CPU having a clock function and outputting signals from different output ports at a plurality of set times, a backlight driving circuit connected to each of a plurality of backlight driving circuits connected to each output port, A plurality of light emitting diodes respectively connected to these backlight driving circuits and driven in response to a signal from the CPU to emit light, wherein light emitting diodes of different colors emit light at different set times to change the color of the backlight. The difference is that the set time can be recognized only by looking at the color of the backlight.

[0003] Another conventional variable color tone of a backlight is disclosed in Japanese Patent Application Laid-Open No. 8-125729. This device includes a light emitting element that emits red, green, and blue light and a slide-type backlight color tone adjustment switch, and supplies a current corresponding to the color tone set by the adjustment switch to three light emitting elements to provide a desired backlight. This is to obtain the light display color.

[0004]

SUMMARY OF THE INVENTION Among the techniques described above,
What is described in JP-A-5-37620 is
When the keyboard is pressed or the power is turned on, a signal is output from a different port of the CPU, and the signal driven by the backlight drive circuit causes the light emitting diode to emit light, enabling recognition of the set time based on the display color of the backlight Is adopted.

However, in such a configuration, the number of diodes that can emit light at a certain set time is limited.
In addition, since the light emitted from the light emitting diodes is displayed in a single color without being mixed, the color tone of the backlight light is poor and the user cannot freely select the color.

The device described in Japanese Patent Application Laid-Open No. 8-125729 has a configuration in which the amount of light emitted from a light emitting element is adjusted by controlling a combination of the magnitudes of currents supplied to the respective light emitting elements.

However, in such a configuration, since the amount of light emission of the light emitting elements is adjusted by controlling the magnitude of the current supplied to these light emitting elements, the light emitting elements do not emit light as intended, Therefore, a desired backlight color cannot be obtained.

As described above, in any of the prior arts, the backlight of the portable telephone is a display of only one fixed color, so that it is not possible to set the backlight to a color that is easy to see for each user. was there.

[0009]

In order to solve the above-mentioned problems, the first and second embodiments of the present invention have the following features.
A plurality of pulse width modulation circuits incorporated in the control means to change the pulse width; a plurality of LED driving transistors to which pulses output from the plurality of pulse width modulation circuits are input;
A plurality of light emitting diodes driven by outputs of the plurality of LED driving transistors to emit light.

Further, the plurality of pulse width modulation circuits include an oscillation circuit that oscillates a pulse and a pulse width adjustment circuit that changes a pulse width of the pulse oscillated by the oscillation circuit.

The plurality of pulse width modulation circuits include first to third three pulse width modulation circuits.
The driving transistor includes first to third three LED driving transistors, and the plurality of light emitting diodes emit a red light, a second light emitting diode, and a blue light. And a third light emitting diode.

Further, the pulse width adjusting circuit for changing the pulse width adjusts the pulse width outputted from the oscillation circuit to change the average current flowing through the plurality of light emitting diodes to change the light emission luminance. I do.

[0013] Further, when the duty cycle of the pulse supplied from the plurality of LED driving transistors is long, the emission luminance of the plurality of light emitting diodes increases, and when the duty cycle is short, the emission luminance decreases. .

[0014] The display color of the backlight is set by a mixture of light emission colors of light emitting diodes that emit red, green, and blue light.

Generating and supplying a pulse from the first to third pulse width modulation circuits; a first light emitting diode emitting red light by the pulse, a second light emitting diode emitting green light, and a blue light emitting diode. Illuminating a third light-emitting diode that emits light; determining whether a display color of the backlight based on a mixture of the first, second, and third light-emitting diodes is preferred; and preferring a display color of the backlight. Determining whether the display color is not a desired display color, and returning to the step of changing the pulse width of the pulse and generating and supplying the pulse from the first to third pulse width modulation circuits. Features.

Also, a plurality of pulse width modulation circuits incorporated in the control means for changing the pulse width, a plurality of LED driving transistors to which pulses output from the plurality of pulse width modulation means are inputted, and a plurality of LED driving circuits A plurality of current limiting circuits connected to the driving transistors for limiting an amount of flowing current, and a plurality of light emitting diodes driven by outputs of the plurality of LED driving transistors to emit light.

The plurality of pulse width modulation circuits include first to ninth nine pulse width modulation circuits, and a plurality of LED
The driving transistor includes first to ninth nine LED driving transistors, the plurality of current limiting units includes first to ninth nine current limiting units, and the plurality of light emitting diodes emit red light. , A second light emitting diode that emits green light, and a third light emitting diode that emits blue light.

Further, the magnitudes of the resistance values of the first to third current limiting means are set in the order of the first current limiting means> the second current limiting means> the third current limiting means. The magnitude of the resistance value of the current limiting means of No. 6 is the fourth current limiting means>
The fifth current limiting unit is set in the order of the sixth current limiting unit, and the magnitudes of the resistance values of the seventh to ninth current limiting units are set as the seventh current limiting unit> the eighth current limiting unit> the ninth current limiting unit. The light emission luminance of the first light emitting diode is dark when the first LED driving transistor is turned on, and is normal when the second LED driving transistor is turned on. When the third LED driving transistor is turned on, it emits light brightly, and the light emitting luminance of the second light emitting diode is turned on by the fourth LED driving transistor.
When the fifth LED driving transistor is turned on, it is dark, when the sixth LED driving transistor is turned on, it emits bright light, and when the fifth LED driving transistor is turned on, it emits bright light. Is dark when the seventh LED driving transistor is turned on, and is normally dark when the eighth LED driving transistor is turned on.
When the driving transistor is turned on, it emits light brightly.

A step of generating and supplying a pulse from any of the first to third pulse width modulation circuits; a step of determining whether or not the first LED driving transistor is turned on by the pulse; When the first LED driving transistor is turned on in the step of determining whether the first LED driving transistor is turned on, when the first LED driving transistor is turned on, the first light emitting diode emits dark light; When the transistor is not turned on, determining whether the second LED driving transistor is turned on by a pulse;
When the second LED driving transistor is turned on in the step of determining whether or not the LED driving transistor is turned on, the first light emitting diode emits light normally and the second LED driving transistor is turned on. When the transistor is not turned on, the pulse causes the third LED
In the step of determining whether the driving transistor is turned on and the step of determining whether the third LED driving transistor 3 is turned on, when the third LED driving transistor is turned on, the first And the step of generating and supplying a pulse from any of the fourth to sixth pulse width modulation circuits, and determining whether the fourth LED driving transistor is turned on by the pulse. And when the fourth LED driving transistor is turned on. When the fourth LED driving transistor is turned on, the second light emitting diode emits dark light. When the LED driving transistor of No. 4 is not turned on, the fifth LED is output by a pulse.
Determining whether the driving transistor is turned on, determining whether the fifth LED driving transistor is turned on, and determining whether the fifth LED driving transistor is turned on; When the fifth LED driving transistor is turned on, the second light emitting diode emits light normally, and when the fifth LED driving transistor is not turned on, the sixth LED is driven by a pulse. In the step of determining whether the LED driving transistor is ON and the step of determining whether the sixth LED driving transistor is ON, when the sixth LED driving transistor is ON, The second light emitting diode emits light brightly; and the seventh to ninth pulse width modulation circuits. And supplying to generate a pulse from either Re and determining whether LED driving transistor of the seventh is turned ON by the pulse, the seventh
When the seventh LED driving transistor is turned on in the step of determining whether or not the LED driving transistor is turned on, the third light emitting diode emits dark light, and the seventh LED driving transistor is turned on. Is O
If not, a step of determining whether the eighth LED driving transistor has been turned on by a pulse and a step of determining whether the eighth LED driving transistor has been turned on When the driving transistor is turned on, the third light emitting diode emits light normally, and when the eighth LED driving transistor is not turned on, a pulse causes the ninth LED driving transistor to emit light. When the ninth LED driving transistor 3 is turned on, the third light emitting diode is turned on when the ninth LED driving transistor 3 is turned on. Emitting bright light and determining whether the display color of the backlight is a desired color , The display color is determining whether a is a favorite color of the backlight, and if not display color preference, the first from the third change the pulse width of the pulse
And returning to the step of generating and supplying a pulse from any one of the pulse width modulation circuits described above.

By adopting the above-described configuration, the present invention changes the pulse width of the pulse output from the pulse width modulation circuit individually to obtain an average current flowing through the red light emitting diode, the green light emitting diode, and the blue light emitting diode. , And individually adjusting the light emission luminance of each light emitting diode, thereby providing a free backlight display color of the mobile phone that suits the user's preference.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a diagram showing a main configuration of a first embodiment of the present invention. As shown in the figure, in the present embodiment, a plurality of PWMs (Puls
e Width Modulation: pulse width modulation circuits 3 to 5,
A plurality of LED driving transistors 6 to 8 to which pulses output from a plurality of pulse width modulation circuits 3 to 5 are input;
It is composed of a plurality of light emitting diodes 9 to 11 which are driven by the outputs of the plurality of LED driving transistors 6 to 8 and emit light.

As shown in FIG. 1, the first P
The output of the WM circuit 3 is connected to the base of the first LED driving transistor 6. The emitter of the first LED driving transistor 6 is grounded, and the output of the collector is connected to the first light emitting diode 9 which emits red light.

Similarly, the output of the second PWM circuit 4 is connected to the base of the second LED driving transistor 7, the emitter of the second LED driving transistor 7 is grounded, and the output of the collector is connected. It is connected to a second light emitting diode 10 that emits green light.

Further, the output of the third PWM circuit 5 is connected to the base of the third LED driving transistor 8,
The emitter of the third LED driving transistor 8 is grounded, and the output of the collector is connected to the third light emitting diode 11 which emits blue light.

The first to third light emitting diodes 9 to 1
Since the circuit configuration for emitting 1 is common, here,
Only the circuit for causing the first light emitting diode 9 to emit light will be described, and the other circuit description will be omitted.

FIG. 2 is a diagram showing the internal configuration of the first PWM circuit 3 of FIG.

The first PWM circuit 3 is a circuit for changing a pulse width. As shown in FIG. 2, the first PWM circuit 3 includes an oscillation circuit 12 that generates a pulse and a pulse width adjustment circuit 13 that changes the generated pulse width. The pulse width adjustment circuit 13 can adjust the pulse width of the pulse generated from the oscillation circuit 12 without changing the frequency.

The pulse generated by the first PWM circuit 3 is supplied to the gate of the first LED driving transistor 6 at the next stage. Here, the first LED driving transistor 6
Is an NPN transistor, the pulse input from the gate is inverted and amplified and output from the collector. Then, the pulse having the adjusted pulse width is supplied to the first light emitting diode 9 which emits red light. The first light emitting diode 9 emits red light with luminance proportional to the pulse width.

Although the first to third LED driving transistors 6 to 8 are NPN transistors, other types of transistors may be used.

FIG. 3 is a diagram showing a pulse waveform output from the PWM circuit.

FIG. 4 shows a pulse width adjusting circuit 13 for controlling the pulse width.
FIG. 7 is a diagram showing a relationship between the pulse width and the light emission brightness after adjustment in FIG.

The pulse waveform output from the first pulse width modulation circuit 3 is as shown in FIG. In FIG. 3, the duty ratio (pulse width) is the ratio W / T of the period (T) from the rising edge of the ON period to the rising edge of the next ON period and the pulse width (W). The pulse width can be varied by the pulse width adjustment circuit 13, and the variable width is 0 to 10
It is between 0%. The light emitting diode lights up during the ON period,
Turns off during the OFF period. The longer the ON period, the higher the average voltage of the base supplied to the base of the LED driving transistor, so that the light emitting time of the light emitting diode becomes longer, and the shorter the shorter, the shorter the average voltage, the shorter the light emitting time. For example, as shown in FIG. 4, when the duty cycle of the ON period becomes 100% (always ON period),
The light emission luminance of the light emitting diode becomes 100%. When the duty cycle becomes 50%, the light emission luminance becomes 50%. When the duty cycle becomes 0% (always OFF period), the light emission luminance becomes 0%. Therefore, the longer the duty cycle is, the longer the period during which the LED driving transistor is ON is, and accordingly, the light emission luminance of the light emitting diode is increased in proportion thereto.

FIG. 5 shows a first example of emitting red, blue and green light.
FIG. 13 is a diagram showing a state in which light emission colors of third to third light emitting diodes 9 to 11 are additively mixed to create a desired color. In the figure, a small circle indicates a state in which the light emitting diode emits dark light, a medium-sized circle indicates a state in which light is emitted normally, and a large circle indicates a state in which light is emitted brightly. The intersection of the three circles indicated by oblique lines is the backlight display color displayed at that time.

For example, FIG. 5A shows that the first light-emitting diode 9 that emits red light is dark, the second light-emitting diode 10 that emits green light is normal, and the third light-emitting diode 11 that emits blue light is Since the light is emitted brightly, the backlight display color becomes a color close to light blue in this case. FIG.
(B) is a case where the first light-emitting diode 9 is bright, the second light-emitting diode 10 is dark, and the third light-emitting diode 11 emits light normally. In this case, the backlight display color is reddish purple. It becomes close color. FIG. 5C shows that the first light emitting diode 9 is normally used and the second light emitting diode 10 is used.
Is dark and the third light emitting diode 11 emits dark light. In this case, the backlight display color is a color close to yellow.

The display color of the backlight of the present invention is displayed by a mixture of the emission colors of the first to third light emitting diodes 9 to 11. As is well known in color television, etc., red,
Nearly infinite colors can be created by mixing the three primary colors of blue and green. The present invention is based on the principle of chromaticity, and adjusts the light emission luminance of the first to third light emitting diodes 9 to 11 that emit red, blue, and green light to create a desired color. The colors that can be displayed are infinite.

FIG. 6 is a flowchart showing a method for setting a backlight display color according to the first embodiment of the present invention.

Next, the operation of the first embodiment of the present invention will be described with reference to FIG. 1, FIG. 2, and FIG.

The first to third PWM circuits 3 to 3 of the control means 2
5 to generate and supply a pulse (step S100), and the first to third pulses are generated by the pulse generated in step S100.
The light emitting diodes 9 to 11 emit light (step S1).
01) At this time, the pulses generated in 3 to 5 of the first to third PWM circuits are set by default or set to the previous set value. Next, an operation of determining whether or not the backlight display color generated by the color mixture of the first to third light emitting diodes 9 to 11 is a desired color is performed. In this determination operation, the user of the mobile phone makes a determination using the input unit 1, and it is confirmed whether or not an input indicating the backlight display color has been made in step S101 (step S101).
102). Here, if the backlight display color is not set to the current color, that is, if there is an input to change, the pulse width of the pulse is changed (step S103).
Returning to step S100, the above operation is repeated.

Hereinafter, the pulse widths of the pulses output from the pulse width modulation circuits 3 to 5 are changed until the desired backlight display color is obtained, and the first to third light emitting diodes 9 to 1 are changed.
1 is individually adjusted.

The input means 1 may be realized by an arbitrary method such as a key or a switch.

Next, a second embodiment of the present invention will be described with reference to the drawings.

FIG. 7 is a block diagram showing a second embodiment of the present invention. As shown in the second embodiment, the present invention provides a plurality of pulse width modulation circuits 21, 26, 30, 34, which output a pulse having a pulse width proportional to the magnitude of an input signal built in control means 20. 39, 43, 47, 52,
56 and a plurality of pulse width modulation circuits 21, 26, 30, 3
4, 39, 43, 47, 52, 56, a plurality of LED driving transistors 23,
28, 32, 36, 41, 45, 49, 54, 58;
Plural LED driving transistors 23, 28, 32, 3
6, 41, 45, 49.54, 58, and a plurality of current limiting means 24, 29, 3 for limiting the amount of flowing current.
3, 37, 42, 46, 50, 55, 59 and a plurality of L
ED driving transistors 23, 28, 32, 36, 4
It comprises a plurality of light emitting diodes 25, 38, 51 which emit light when driven by the outputs of 1, 45, 49, 54, 58.

FIG. 8 is a flowchart showing a method for setting a backlight display color according to the second embodiment of the present invention.

In FIG. 7, the first to third LED driving transistors 23, 28, 32 are connected to the ports 22, 27, 31 of the first to third pulse width modulation circuits 21, 26, 30 respectively.
It is configured to function as a switching circuit that is turned on / off by a pulse output from the switch. In the second embodiment, the first to third pulse width modulation circuits 21, 26, 3
0 to generate a pulse and supply it,
Only one of the LED driving transistors 23, 28, 32 is turned ON. Then, the magnitudes of the resistance values of the first to third current limiting units 24, 29, and 33 at the next stage are determined by the first current limiting unit 24> the second current limiting unit 29> the third current limiting unit 33. When set in order, one of the first to third LED driving transistors 23, 28, and 32 is turned on, and a current flows, and the light emission luminance of the first light emitting diode 25 is determined according to the set resistance value. Is done. That is, the first
When the LED driving transistor 23 is turned on, the first
Since the resistance value of the current limiting means 24 is large, the first light emitting diode 25 emits dark light. When the second LED driving transistor 28 is turned on, the first light emitting diode 25 emits light normally. When the third LED driving transistor 32 is turned on, the third current limiting means 33
, The first light emitting diode 25 emits light brightly.

Hereinafter, the second and third light emitting diodes 38,
The light emission luminance of 51 is determined in the same manner. Therefore,
The first to third light emitting diodes 25, 38, and 51 emit light at any one of three levels (dark, ordinary, and bright).

Note that the resistance value of the current limiting means may be set in the order of the first current limiting means 24 <the second current limiting means 29 <the third current limiting means 33, or in any order.

Next, the operation of the second embodiment of the present invention will be described with reference to FIGS. 7, 8 and 9.

The first to third PWM circuits 2 of the control means 20
A pulse is generated and supplied from one of 1, 2, and 30 (step S200). At this time, the first to third PW
The pulses generated in M21, M26, M30 and M30 are set by default or set to the previous set value. Hereinafter, the same applies to the fourth to ninth PWM circuits 34, 39, 43, 47, 52, and 56. It is determined whether the first LED driving transistor 23 has been turned ON by the supplied pulse (step S201). Here, when the first LED driving transistor 23 is turned on, the first light emitting diode 25 emits dark light (step S202), and when it is not turned on, the second LED driving transistor 28 is turned on. Is turned on (step S20).
3). Here, when the second LED driving transistor 28 is turned on, the first light emitting diode 25 normally emits light (step S204), and when not turned on, the third LED driving transistor 25 is turned on. It is determined whether the transistor 32 is turned on (step S205). Here, when the third LED driving transistor 32 is turned on, the first light emitting diode 25 emits light brightly (step S206). Next, a pulse is generated and supplied from any of the fourth to seventh PWM circuits 34, 39, and 43 (step S207). It is determined whether or not the fourth LED driving transistor 36 has been turned ON by the supplied pulse (step S208). Here, the fourth L
When the ED driving transistor 36 is turned on, the second light emitting diode 38 emits dark light (step S20).
9) If it is not ON, it is determined whether the fifth LED driving transistor 41 is ON (step S210). Here, when the fifth LED driving transistor 41 is ON, the second light emitting diode 38 emits light normally (step S211). O
If it is not N, it is determined whether the sixth LED driving transistor 45 is ON (step S212). Here, when the sixth LED driving transistor 45 is ON, the second light emitting diode 38 emits light brightly (step S213). Subsequently, a pulse is generated and supplied from any of the circuits 47, 52, and 56 to determine whether the seventh to ninth PWM seventh LED driving transistors 49 are turned on (step S2).
14). It is determined whether the seventh LED driving transistor 49 has been turned on (step S215). Here, when the seventh LED driving transistor 49 is turned on, the third light emitting diode 51 emits dark light (step S216). If not, it is determined whether the eighth LED driving transistor 54 has been turned on (step S217). Here, the eighth L
When the ED driving transistor 54 is turned on, the third light emitting diode 51 emits light normally (step S).
218). If not, it is determined whether the ninth LED driving transistor 58 is on (step S219). Here, when the ninth LED driving transistor 58 is ON, the third light emitting diode 51 emits bright light (step S22).
0). Next, the first to third light emitting diodes 25, 38,
An operation of determining whether or not the backlight display color created by the color mixture of 51 is a desired color is performed. In this determination operation, the user of the mobile phone makes a determination using the input unit 19, and it is confirmed whether or not an input to use the displayed backlight display light has been made (step S221). Here, if the backlight display color is not set to the current color, that is, if there is an input to change, the pulse width of the pulse is changed (step S222), and step S20 is performed.
Returning to 0, the above operation is repeated.

Hereinafter, each pulse width modulation circuit 21, 26, 30, 34, 39,
By changing the pulse width of the pulses output from 43, 47, 52, 56, the first to third light emitting diodes 25, 38,
The light emission luminances of 51 are individually adjusted.

[0051]

As described above, according to the present invention,
It has three types of light-emitting diodes, red, green and blue light-emitting diodes. By controlling the average current flowing through each diode individually, the user can freely select the backlight light of the mobile phone. effective.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a main part of a first embodiment of the present invention.

FIG. 2 is a diagram illustrating an internal configuration of a PWM circuit of FIG. 1;

FIG. 3 is a diagram showing a pulse waveform output from a PWM circuit.

FIG. 4 is a diagram showing a relationship between a pulse width and a light emission luminance after a pulse width is adjusted by a pulse width modulation circuit.

FIG. 5 is a diagram illustrating a state in which light colors of first to third light emitting diodes that emit red, green, and blue light are additively mixed to create a desired color.

FIG. 6 is a flowchart showing a method for setting a backlight display color according to the first embodiment of the present invention.

FIG. 7 is a diagram showing a main configuration of a second embodiment of the present invention.

FIG. 8 is a flowchart illustrating a method for setting a backlight display color according to a second embodiment of the present invention.

FIG. 9 is a flowchart showing a method for setting a backlight display color according to a second embodiment of the present invention.

[Explanation of symbols]

1,19 Input means 2,20 Control means 2,3,4,21,26,30,34,39,43,4
7, 52, 56 PWM circuit 8, 9, 10, 25, 38, 51 Light emitting diode 12 Oscillation circuit 13 Pulse width modulation circuit 22, 27, 31, 35, 40, 44, 48, 53, 5
7 Output port 5, 6, 7, 23, 28, 32, 36, 41, 45, 4
9, 54, 58 LED driving transistors 24, 29, 33, 37, 42, 46, 50, 55, 5
9 Current limiting resistor

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[Procedure amendment]

[Submission date] March 31, 1999

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

4. A pulse width modulation circuit for generating a pulse , a light emitting diode emitting at least a key portion, and a current limiter for limiting an amount of current flowing through the light emitting diode.
Means and a transistor for controlling current output to the light emitting diode
And a plurality of pulse width modulation circuits for one light emitting diode.
Path, current limiting means and transistor
The plurality of current limiting means are provided with different limited current amounts.
Is provided in advance, and the plurality of transistors are turned on.
Limit the pulse input based on the power on / off,
It is characterized in that the amount of current output to the ion varies.
Backlight display device for mobile phones .

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction contents]

[0009]

A backlight display device for setting a backlight display of a mobile phone to an arbitrary color, comprising: a plurality of pulse width modulation circuits built in control means for changing a pulse width; A plurality of LED driving transistors to which pulses output from a plurality of pulse width modulation means are input; a plurality of current limiting circuits connected to the plurality of LED driving transistors to limit an amount of flowing current; And a plurality of light emitting diodes that emit light when driven by the output of the transistor.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction contents]

The plurality of pulse width modulation circuits include first to ninth nine pulse width modulation circuits, and a plurality of LED width modulation circuits.
The driving transistor includes first to ninth nine LED driving transistors, the plurality of current limiting units includes first to ninth nine current limiting units, and the plurality of light emitting diodes emit red light. , A second light emitting diode that emits green light, and a third light emitting diode that emits blue light.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction contents]

Further, the magnitudes of the resistance values of the first to third current limiting means are set in the order of first current limiting means> second current limiting means> third current limiting means, and the fourth to fourth current limiting means are set in this order. The magnitude of the resistance value of the current limiting means of No. 6 is the fourth current limiting means>
The fifth current limiting unit is set in the order of the sixth current limiting unit, and the magnitudes of the resistance values of the seventh to ninth current limiting units are set as the seventh current limiting unit> the eighth current limiting unit> the ninth current limiting unit. The light emission luminance of the first light emitting diode is dark when the first LED driving transistor is turned on, and is normal when the second LED driving transistor is turned on. When the third LED driving transistor is turned on, it emits light brightly, and the light emitting luminance of the second light emitting diode is turned on by the fourth LED driving transistor.
When the fifth LED driving transistor is turned on, it is dark, when the sixth LED driving transistor is turned on, it emits bright light, and when the fifth LED driving transistor is turned on, it emits bright light. Is dark when the seventh LED driving transistor is turned on, and is normally dark when the eighth LED driving transistor is turned on.
When the driving transistor is turned on, it emits light brightly.

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0012

[Correction method] Change

[Correction contents]

A pulse width driving circuit for generating a pulse; a light emitting diode for emitting light at least in a key portion; current limiting means for limiting an amount of current flowing through the light emitting diode; and a transistor for controlling a current output to the light emitting diode. A plurality of pulse width modulation circuits, current limiting means, and transistors are provided corresponding to one light emitting diode, and a plurality of current limiting means are provided with different current limiting amounts in advance. The present invention is characterized in that the input of a pulse is limited based on the on / off state of the transistor, and the amount of current output to the light emitting diode changes.

[Procedure amendment 6]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction contents]

A step of generating and supplying a pulse from any of the first to fourth pulse width modulation circuits; a step of determining whether or not the first LED driving transistor is turned on by the pulse; In the step of determining whether or not the LED driving transistor is turned on, when the first LED driving transistor is turned on,
The first light emitting diode emitting dark light;
When the LED driving transistor is not turned on, the second LED driving transistor is turned on by a pulse.
N; and a second LED
In the step of determining whether or not the driving transistor is turned on, when the second LED driving transistor is turned on, the step in which the first light emitting diode emits light normally and the step in which the second LED driving transistor is turned on If the third LED driving transistor 3 has not been turned on, a third step of determining whether the third LED driving transistor has been turned on by a pulse and a step of determining whether the third LED driving transistor 3 has been turned on have a third step. When the LED driving transistor is turned on, the first light emitting diode emits light brightly, a pulse is generated and supplied from any of the fourth to sixth pulse width modulation circuits, Determining whether the fourth LED driving transistor has been turned on;
In the step of determining whether or not the ED driving transistor is turned on, the fourth LED driving transistor is turned on.
Is reached, the second LED emits dark light, and if the fourth LED driving transistor is not turned on, it is determined whether the fifth LED driving transistor is turned on by a pulse. Performing the step of determining whether the fifth LED driving transistor has been turned on, and determining whether the fifth LED driving transistor has been turned on. When the second LED emits light normally, and when the fifth LED driving transistor is not ON, whether the sixth LED driving transistor is ON by a pulse. Determining whether or not;
In the step of determining whether the sixth LED driving transistor is ON, when the sixth LED driving transistor is ON, the step of emitting the second light emitting diode brightly; 9, a step of generating and supplying a pulse from any one of the pulse width modulation circuits, a step of determining whether or not the seventh LED driving transistor is turned on by the pulse;
In the step of determining whether the ED driving transistor is turned on, the seventh LED driving transistor is turned on.
Is reached, the third light emitting diode emits dark light, and if the seventh LED driving transistor is not turned on, it is determined whether the eighth LED driving transistor is turned on by a pulse. And when the eighth LED driving transistor is turned on, the third light emitting diode emits light normally when the eighth LED driving transistor is turned on, When the eighth LED driving transistor is not ON, the ninth LED driving transistor is turned on by a pulse.
When the ninth LED driving transistor is ON, the step of determining whether the LED driving transistor is ON and the step of determining whether the ninth LED driving transistor 3 is ON are performed. The step of illuminating the third light emitting diode brightly, the step of determining whether the display color of the backlight is a desired color, and the step of determining whether the display color of the backlight is the desired color. If the display color is not the above, the step of changing the pulse width of the pulse and returning to the step of generating and supplying a pulse from any of the first to third pulse width modulation circuits is provided.

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Claims (11)

[Claims] 1. A backlight display device for setting a backlight display of a mobile phone to an arbitrary color, comprising: a plurality of pulse width modulation circuits incorporated in control means for changing a pulse width; A backlight display, comprising: a plurality of LED driving transistors to which a pulse output from a circuit is input; and a plurality of light emitting diodes driven by outputs of the plurality of LED driving transistors to emit light. Backlight display device that sets the color to any color. 2. The backlight display device according to claim 1, wherein the backlight display of the mobile phone is set to an arbitrary color. A backlight display device for setting a backlight display of a mobile phone to an arbitrary color, comprising a pulse width adjusting circuit for changing a pulse width of an oscillated pulse. 3. The backlight display device according to claim 1, wherein the backlight display of the mobile phone is set to an arbitrary color.
A plurality of LED driving transistors, wherein the plurality of LED driving transistors comprise first to third three LED driving transistors, wherein the plurality of light emitting diodes emit a red light, and a green light emitting diode. A backlight display device for setting a backlight display of a mobile phone to an arbitrary color, comprising a second light emitting diode that emits light and a third light emitting diode that emits blue light. 4. The backlight display device for setting a backlight display of a mobile phone to an arbitrary color according to claim 2, wherein the pulse width adjustment circuit for changing the pulse width includes a pulse output from the oscillation circuit. Adjust the width,
A backlight display device for setting a backlight display of a mobile phone to an arbitrary color, wherein an emission current is changed by changing an average current flowing through the plurality of light emitting diodes. 5. The backlight display device according to claim 1, wherein the plurality of light emitting diodes are provided when a duty cycle of a pulse supplied from the plurality of LED driving transistors is long. A backlight display device for arbitrarily setting a backlight display of a mobile phone, characterized in that the light emission luminance becomes high and the light emission luminance becomes low when the duty cycle is short. 6. The backlight display device according to claim 3, wherein the display color of the backlight is set to an arbitrary color.
A backlight display device for setting a backlight display of a mobile phone to an arbitrary color, wherein the backlight display is set by a mixed color of light emission colors of light emitting diodes emitting blue light. 7. A step of generating and supplying a pulse from the first to third pulse width modulation circuits; a first light emitting diode that emits red light by the pulse, a second light emitting diode that emits green light, and blue. Illuminating a third light-emitting diode that emits light at the same time; determining whether a display color of the backlight by mixing the first, second, and third light-emitting diodes is preferable; If the display color is not the desired display color in the step of determining whether or not the color is a favorite, a step of changing the pulse width of the pulse and returning to the step of generating and supplying a pulse from the first to third pulse width modulation circuits. And a backlight display method for setting the backlight display of the mobile phone to an arbitrary color. 8. A backlight display device for setting a backlight display of a mobile phone to an arbitrary color, comprising: a plurality of pulse width modulation circuits built in control means for changing a pulse width; A plurality of LED driving transistors to which a pulse output from the means is input; a plurality of current limiting circuits connected to the plurality of LED driving transistors to limit an amount of flowing current; A backlight display device for setting a backlight display of a mobile phone to an arbitrary color, comprising: a plurality of light emitting diodes that emit light when driven by an output. 9. The backlight display device for setting a backlight display of a mobile phone to an arbitrary color according to claim 8, wherein the plurality of pulse width modulation circuits are selected from first to ninth nine pulse width modulation circuits. Wherein the plurality of LED driving transistors comprises first to ninth nine LED driving transistors;
To ninth current limiting means, wherein the plurality of light emitting diodes are a first light emitting diode that emits red light, a second light emitting diode that emits green light, and a third light emitting diode that emits blue light. A backlight display device for setting a backlight display of a mobile phone to an arbitrary color. 10. The backlight display device according to claim 8, wherein the backlight display of the mobile phone is set to an arbitrary color. The resistance value of the first to third current limiting means is equal to the first current. Limiting Means> Second Current Limiting Means> Third
And the magnitudes of the resistance values of the fourth to sixth current limiting means are set in the order of fourth current limiting means> fifth current limiting means> sixth current limiting means. The magnitudes of the resistance values of the seventh to ninth current limiting means are set in the order of seventh current limiting means> eighth current limiting means> ninth current limiting means. The light emission luminance of the first LED driving transistor is O
N, the third LED is normally dark when the second LED driving transistor is turned on.
When the driving transistor is turned on, light is emitted brightly, and the light emission luminance of the second light emitting diode is dark when the fourth LED driving transistor is turned on,
Normally, when the fifth LED driving transistor is turned on, the sixth LED driving transistor is turned on.
When it became N, it emitted light brightly, and the emission luminance of the third light emitting diode was dark when the seventh LED driving transistor was turned on, and the eighth LED driving transistor was turned on. Sometimes, normally, the ninth L
A backlight display device for setting a backlight display of a mobile phone to an arbitrary color, wherein the backlight emits bright light when an ED driving transistor is turned on. 11. A step of generating and supplying a pulse from any one of the first to third pulse width modulation circuits, and the first LED driving transistor is turned on by the pulse.
Determining whether the first LED driving transistor has been turned on; and determining whether the first LED driving transistor has been turned on. Emitting dark light; and determining whether the second LED driving transistor has been turned on by the pulse if the first LED driving transistor has not been turned on; Determining whether or not the driving transistor is turned on, wherein when the second LED driving transistor is turned on, the first light emitting diode emits light normally; and When the driving transistor is not turned on, the pulse causes the third LED driving transistor to operate. Determining whether the third LED driving transistor 3 has been turned on; determining whether or not the third LED driving transistor 3 has been turned on; A step in which the light emitting diode emits light brightly; a step in which a pulse is generated and supplied from any of the fourth to sixth pulse width modulation circuits; and whether the fourth LED driving transistor is turned on by the pulse. When the fourth LED driving transistor is turned on, the second light emitting diode emits dark light when the fourth LED driving transistor is turned on. And if the fourth LED driving transistor is not turned ON, the fifth pulse is output by the pulse. Determining whether the LED driving transistor is ON; determining whether the fifth LED driving transistor is ON; determining whether the fifth LED driving transistor is ON In the step, when the fifth LED driving transistor is turned on, the second light emitting diode normally emits light; and when the fifth LED driving transistor is not turned on, Determining whether or not a sixth LED driving transistor is ON by the pulse; and determining whether or not the sixth LED driving transistor is ON, the sixth LED driving transistor Is ON, the second light emitting diode emits light brightly Generating a pulse from any one of the seventh to ninth pulse width modulation circuits and supplying the pulse; determining whether the seventh LED driving transistor is turned on by the pulse; Determining whether the seventh LED driving transistor is turned on, wherein the third light emitting diode emits dark light when the seventh LED driving transistor is turned on; When the LED driving transistor is not turned on, a step of determining whether the eighth LED driving transistor is turned on by the pulse; and determining whether the eighth LED driving transistor is turned on. In the step, when the eighth LED driving transistor is turned on, the third light emitting diode is turned on. The LED normally emits light; and when the eighth LED driving transistor is not turned on, determining whether the ninth LED driving transistor is turned on by the pulse; A step of determining whether the ninth LED driving transistor 3 is ON, wherein the third LED emits light brightly when the ninth LED driving transistor is ON; Determining whether the display color of the backlight is a desired color; and determining whether the display color of the backlight is the desired color. If the display color is not the desired display color, the pulse width of the pulse is changed. Returning to the step of generating and supplying a pulse from any of the first to third pulse width modulation circuits; Backlight display method for setting the backlight display of the mobile phone in any color, which comprises.