Light emitting diode control device
First Claim
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1. A control device of LEDs, comprising:
- driving means for driving LEDs; and
pulse output means for varying a cycle and a corresponding duty ratio of a pulse signal outputted to the driving means to control the driving means,wherein the pulse output means includes lighting-up means that gradually increases the cycle and the corresponding duty ratio of the pulse signal during a lighting-up period of the LEDs beginning at a start of a lighting-up of the LEDs.wherein the lighting-up period includes a plurality of cycles, wherein the cycles serially take place and wherein each of the cycles is corresponded to by a duty ratio,wherein the lighting-up means includes;
given cycle set means for setting a cycle of the pulse signal;
given duty ratio set means for setting a duty ratio of the pulse signal; and
given update means,wherein, during the lighting-up period of the LEDs since the lighting-up of the LEDs starts, the given update means outputs, within a cycle set by the given cycle set means, a pulse signal having a time width relative to a corresponding duty ratio set by the given duty ratio set means, andwherein, when a cycle elapses, the given update means instructs the given cycle set means to set a cycle taking place subsequently to the elapsed cycle by increasing the elapsed cycle and instructs the given duty ratio set means to set a duty ratio corresponding to the cycle taking place subsequently to the elapsed cycle by increasing the duty ratio corresponding to the elapsed cycle.
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Abstract
A control device of LEDs includes a lighting-up circuit and a lighting-out circuit, both of which generate pulse signals being pulse-width modulated by varying cycles and corresponding duty ratios based on an input signal during a start-up period and a falling period, respectively. The control device then provides LEDs with the electric current relative to the pulse signals. Both of the lighting-up circuit and lighting-out circuit vary the cycles and corresponding duty ratios of the pulse signals, so that a luminance variation characteristic of the LEDs becomes nonlinear, leading to being approximated to a luminance variation characteristic of an electric bulb.
21 Citations
5 Claims
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1. A control device of LEDs, comprising:
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driving means for driving LEDs; and pulse output means for varying a cycle and a corresponding duty ratio of a pulse signal outputted to the driving means to control the driving means, wherein the pulse output means includes lighting-up means that gradually increases the cycle and the corresponding duty ratio of the pulse signal during a lighting-up period of the LEDs beginning at a start of a lighting-up of the LEDs. wherein the lighting-up period includes a plurality of cycles, wherein the cycles serially take place and wherein each of the cycles is corresponded to by a duty ratio, wherein the lighting-up means includes; given cycle set means for setting a cycle of the pulse signal; given duty ratio set means for setting a duty ratio of the pulse signal; and given update means, wherein, during the lighting-up period of the LEDs since the lighting-up of the LEDs starts, the given update means outputs, within a cycle set by the given cycle set means, a pulse signal having a time width relative to a corresponding duty ratio set by the given duty ratio set means, and wherein, when a cycle elapses, the given update means instructs the given cycle set means to set a cycle taking place subsequently to the elapsed cycle by increasing the elapsed cycle and instructs the given duty ratio set means to set a duty ratio corresponding to the cycle taking place subsequently to the elapsed cycle by increasing the duty ratio corresponding to the elapsed cycle. - View Dependent Claims (2)
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3. A control device of LEDs, comprising:
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driving means for driving LEDs; and pulse output means for varying a cycle and a corresponding duty ratio of a pulse signal outputted to the driving means to control the driving means, wherein the pulse output means includes lighting-out means that gradually decreases the cycle and the corresponding duty ratio of the pulse signal during a lighting-out period of the LEDs beginning from a start of a lighting-out of the LEDs. wherein the lighting-out period includes a plurality of cycles, wherein the cycles serially take place and wherein each of the cycles is corresponded to by a duty ratio, wherein the lighting-out means includes; certain cycle set means for setting a cycle of the pulse signal; certain duty ratio set means for setting a duty ratio of the pulse signal; and certain update means, wherein, during the lighting-out period of the LEDs since the lighting-out of the LEDs starts, the certain update means output, within a cycle set by the certain cycle set means, a pulse signal having a time width relative to a corresponding duty ratio set by the certain duty ratio set means, and wherein, when a cycle elapses, the certain update means instructs the certain cycle set means to set a cycle taking place subsequently to the elapsed cycle by decreasing the elapsed cycle and instructs the certain duty ratio set means to set a duty ratio corresponding to the cycle taking place subsequently to the elapsed cycle by decreasing the duty ratio corresponding to the elapsed cycle.
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4. A control device of LEDs used in a turning signal lamp of a vehicle, comprising:
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driving means that drives the LEDs; lighting-up means that gradually increases the cycle and the corresponding duty ratio of the pulse signal during a lighting-up period of the LEDs beginning from the start of a lighting-up of the LEDs; and lighting-out means that gradually decreases the cycle and the corresponding duty ratio of the pulse signal during a light-out period of the LEDs beginning from the start of a lighting-out of the LEDs, wherein a lamp signal is generated when a switch of the turning signal lamp is operated, wherein, when the lamp signal indicative of the lighting-up of the LEDs is generated, the lighting-up of the LEDs starts, wherein, when the lamp signal indicative of the lighting-out of the LEDs is generated, the lighting-out of the LEDs starts. wherein the lighting-up period includes a plurality of cycles, wherein the cycles serially take place and wherein each of the cycles is corresponded to by a duty ratio, wherein the lighting-up means includes; given cycle set means for setting a cycle of the pulse signal; given duty ratio set means for setting a duty ratio of the pulse signal; and given update means, wherein, during the lighting-up period of the LEDs since the lighting-up of the LEDs starts, the given update means outputs, within a cycle set by the given cycle set means, a pulse signal having a time width relative to a corresponding duty ratio set by the given duty ratio set means, and wherein, when a cycle elapses, the given update means instructs the given cycle set means to set a cycle taking place subsequently to the elapsed cycle by increasing the elapsed cycle and instructs the given duty ratio set means to set a duty ratio corresponding to the cycle taking place subsequently to the elapsed cycle by increasing the duty ratio corresponding to the elapsed cycle.
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5. A control device of LEDs used in a turning signal lamp of a vehicle, comprising:
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driving means that drives LEDs; lighting-up means that gradually increases the cycle and the corresponding duty ratio of the pulse signal during a lighting-up period of the LEDs beginning from the start of a lighting-up of the LEDs; and lighting-out means that gradually decreases the cycle and the corresponding duty ratio of the pulse signal during a light-out period of the LEDs beginning from the start of a lighting-out of the LEDs, wherein a lamp signal is generated when a switch of the turning signal lamp is operated, wherein, when the lamp signal indicative of the lighting-up of the LEDs is generated, the lighting-up of the LEDs starts, wherein, when the lamp signal indicative of the lighting-out of the LEDs is generated, the lighting-out of the LEDs starts, wherein the lighting-out period includes a plurality of cycles, wherein the cycles serially take place and wherein each of the cycles is corresponded to by a duty ratio, wherein the lighting-out means includes; certain cycle set means for setting a cycle of the pulse signal; curtain duty ratio set means for setting a duty ratio of the pulse signal; and certain update means, wherein, during the lighting-out period of the LEDs since the lighting-out of the LEDs starts, the certain update means outputs, within a cycle set by the certain cycle set means, a pulse signal having a time width relative to a corresponding duty ratio set by the certain duty ratio set means, and wherein, when a cycle elapses, the certain update means instructs the certain cycle set means to set a cycle taking place subsequently to the elapsed cycle by decreasing the elapsed cycle and instructs the certain duty ratio set means to set a duty ratio corresponding to the cycle taking place subsequently to the elapsed cycle by decreasing the duty ratio corresponding to the elapsed cycle.
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Specification