WO2015076339A1 - Dispositif de commande de luminosité de del - Google Patents

Dispositif de commande de luminosité de del Download PDF

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Publication number
WO2015076339A1
WO2015076339A1 PCT/JP2014/080787 JP2014080787W WO2015076339A1 WO 2015076339 A1 WO2015076339 A1 WO 2015076339A1 JP 2014080787 W JP2014080787 W JP 2014080787W WO 2015076339 A1 WO2015076339 A1 WO 2015076339A1
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Prior art keywords
led
control
luminance
brightness
information
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PCT/JP2014/080787
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English (en)
Japanese (ja)
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洋治 椋田
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株式会社ステラージアＬｅｄ
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Priority to JP2015549190A priority Critical patent/JPWO2015076339A1/ja
Publication of WO2015076339A1 publication Critical patent/WO2015076339A1/fr

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/20—Controlling the colour of the light

Definitions

  • the present invention relates to an LED brightness control apparatus for driving and adjusting and controlling the brightness of an LED array.
  • LED lighting using light-emitting diodes is characterized by relatively long life and low power consumption compared to conventional lighting fixtures such as fluorescent lamps and incandescent bulbs, and is excellent in consideration for the environment. It is expected as a next-generation lighting device.
  • problems related to reduction of noise of a radiated radio wave hereinafter referred to as “noise”
  • harmonics flowing in an AC input hereinafter referred to as “harmonic”
  • LED lighting devices currently convert alternating current to direct current and are internally driven by direct current, so that a complicated LED peripheral circuit is required.
  • Patent Document 1 discloses an LED driving circuit that drives an LED unit having a plurality of LEDs connected in series, and includes a rectifier that rectifies an AC input, an operational amplifier, and a voltage dividing resistor connected to the output stage of the operational amplifier.
  • a constant current circuit having a plurality of driving transistors connected to each other, one end on the output side of the rectifier connected to the input side of the LED unit, and one end on the output side of the plurality of transistors, respectively, in the LED unit
  • an LED drive circuit characterized in that a plurality of transistors are selectively driven according to an AC input voltage by connecting to connection points having different numbers of LED stages.
  • Patent Document 2 a technique for preventing uneven luminance between display units is disclosed.
  • Patent Document 2 discloses a display panel in which a plurality of display units in which a large number of LEDs are arranged in a matrix are arranged to perform desired display, and display control including lighting control data for each display unit.
  • an information display device characterized by having a function.
  • Patent Document 3 a method of adjusting a back light source for a display device that expands the color reproduction range and realizes a back light source with uniform brightness has been proposed.
  • Patent Document 3 discloses a method of adjusting a back light source including a red current injection semiconductor light emitting device, a green current injection semiconductor light emitting device, and a blue current injection semiconductor light emitting device, wherein the red current The current flowing through each of the injection semiconductor light emitting device, the current injection semiconductor light emitting device for green, and the current injection semiconductor light emitting device for blue is individually adjusted, and then the current injection semiconductor light emitting device for red, A method for adjusting the back light source is disclosed, wherein the current flowing through each of the green current injection type semiconductor light emitting device and the blue current injection type semiconductor light emitting device is adjusted at the same rate.
  • Basic adjustment points of this method and the like are as follows: (1) Monochromatic light emitted from each semiconductor light emitting element by individually controlling the current flowing through each semiconductor light emitting element belonging to the semiconductor light emitting element block of the back light source. The color temperature of the white light obtained by mixing is adjusted so as to be equal to a predetermined standard value, and (2) while maintaining the adjusted color temperature, that is, a single color emitted from each semiconductor light emitting element By controlling the increase or decrease of the current flowing in all the semiconductor light emitting elements in the block at the same rate while maintaining the light intensity ratio, the brightness (brightness) of white light becomes equal to a predetermined desired value. It is in the point to adjust like.
  • the present invention provides an LED brightness control device that can suppress flicker and harmonic generation, achieve low power consumption, and can easily and quickly realize brightness adjustment with smooth brightness change over time.
  • the purpose is to do.
  • the object is to provide a control means, a luminance control information register, a D / A converter unit, and an LED driver connected to each LED row or each LED drive unit in order to control one or a plurality of LED rows.
  • the brightness control information register stores information bits for brightness control and information bits for color tone or LED current value control (hereinafter referred to as “color tone control”), Based on the signal from the control means, the selected information bit for luminance control and the information bit for color tone control are sent to the D / A converter, and the D / A converter unit controls the information bit for luminance control and the color tone control.
  • the LED brightness control apparatus characterized by being configured to turn off or zero output to the LED driver, is achieved.
  • the control means includes a serial communication control unit and a command decoder, and the serial communication control unit converts serial information input in synchronization with a clock signal into data information,
  • the command decoder controls the luminance control information register based on data information from the serial communication control unit.
  • the LED brightness control apparatus is preferably a control circuit in which the control means generates a control signal and sends it to the brightness control information register.
  • the LED brightness control apparatus is preferably characterized in that the control means is a switch circuit.
  • the D / A converter unit determines that at least one of the information bit for luminance control and the information bit for color tone control is data indicating “0”, A determination unit that outputs a signal is provided, and the output is turned off or zero by a determination signal from the determination unit.
  • the determination unit detects that the information bit for luminance control is data indicating “0” and outputs a detection signal;
  • a second detection unit that detects that the information bit for the data is “0” and outputs a detection signal, a detection signal from the first detection unit, and a detection signal from the second detection unit
  • An OR circuit that outputs a determination signal when any one of them is input.
  • the D / A converter unit performs D / A conversion when at least one of the information bit for luminance control and the information bit for color tone control is “0” data. The processing is stopped or the output is turned off.
  • the LED brightness control device preferably turns off the output of the D / A converter when at least one of the brightness control information bit and the color tone control information bit is “0” data. It is characterized by that.
  • the LED brightness control device is preferably configured such that when at least one of the information bit for brightness control and the information bit for color tone control is data indicating “0”, the D / A converter unit by the second switch circuit The output of is turned off.
  • the D / A converter unit operates the switch circuit. And the output is turned off.
  • an LED brightness control device that can suppress the occurrence of flicker and harmonics, achieve low power consumption, and can easily and quickly realize brightness adjustment with a smooth brightness change over time. Etc. can be provided.
  • FIGS. 1 to 3 illustrate the hardware configuration of the LED brightness control apparatus according to the present invention.
  • FIGS. 4 to 6, FIGS. 7 to 9, FIGS. 10 to 12, and FIGS. FIG. 15 explains the processing flow of the LED brightness control device according to the embodiment of the present invention in an easy-to-understand manner in comparison with a conventional control device.
  • FIG. 1 shows a block configuration of an LED brightness control apparatus according to the first embodiment of the present invention.
  • the LED brightness control device 100 includes a serial communication control unit 101, a command decoder 102, a brightness control information register 103, a D / A converter unit 105, a 1-bit switch circuit 106, an LED driver. 107 and an internal voltage generator 108.
  • the brightness control information register 103, the D / A converter unit 105, the 1-bit switch circuit 106, and the LED driver 107 each control the LED row for each RGB.
  • the D / A converter is also referred to as “DAC”.
  • the luminance control information is the uppermost (first stage) circuit in the row of the luminance control information register, D / A converter unit, 1-bit switch circuit, and LED driver in 12 stages in total.
  • the information register 103a1 (and 1-bit register 103a2), the D / A converter unit 105a, the 1-bit switch circuit 106a, and the LED driver 107a are connected to a red (R) series LED string (for example, when full-wave rectification is 24V AC, 9) is controlled.
  • R red series LED string
  • the second-stage circuit controls a green (G) series LED string (for example, nine when full-wave rectification is 24V AC), and the third-stage circuit is blue ( B) Control the series LED string (for example, 9 when full-wave rectification is 24V AC).
  • G green
  • B blue
  • the RGB 1 set LED row control circuit (hereinafter also referred to as “bank”) is composed of three stages of circuits, so in FIG. 1, the RGB 1 set LED row is divided into 4 banks BK0 to BK3. It is configured to be able to control for 12 stages (the number of stages of circuits in color units).
  • circuit configuration example shown in FIG. 1 is an embodiment of the present invention, and the number and stage of the LED rows or the color of the LED to be used can be appropriately changed in design.
  • the number of LEDs that can be connected in series is 13, AC32V is required for full-wave rectification.
  • the serial communication control unit 101 receives serial information Data sent in synchronization with the clock signal Clock, converts it into 8-bit or 16-bit data using a shift register, a counter, etc., and sends it to the command decoding unit 102. .
  • the command decoding unit 102 analyzes the information sent from the serial communication control unit 101. If the command decoding unit 102 matches a device address (4 bits as an example) designated by a host (not shown), an instruction (for example, The entire 12-stage LED element array shown in FIG. 1 is operated according to the information sent.
  • the luminance control information register 103 is an 8-bit register including 3 bits for luminance control and 5 bits for color tone control, and ON / OFF for each color LED, as shown in FIG. And a 1-bit switch circuit register.
  • the D / A converter unit 105 is composed of an 8-bit D / A converter.
  • the 3-bit value for luminance control in the luminance control information register 103 is input and converted into an analog value.
  • the signal converted into an analog value by the D / A converter unit 105 is transmitted to the LED driver 107 via the 1-bit switch circuit 106.
  • the 1-bit switch circuit 106 is a switch circuit that can turn on or off the output of luminance (color) for each color of the LED array, and is configured by a MOSFET as one embodiment as will be described later.
  • the LED driver 107 is a driver circuit that drives an LED row for each RGB color.
  • the internal voltage generation unit 108 uses, as a full-wave rectified AC24V voltage applied by a power supply (not shown), communication, luminance information holding, LED driving, and control internal voltages for control. Is generated and supplied to each control unit / circuit unit.
  • FIG. 2 shows a detailed circuit of the LED brightness control apparatus according to the first embodiment of the present invention.
  • the DAC / LED drive circuit 200 represents a “one stage” detailed circuit of the D / A converter unit 105, the 1-bit switch circuit 106, and the LED driver 107 in the LED brightness control apparatus 100 of FIG. ing.
  • the DAC / LED drive circuit 200 is roughly divided into an 8-bit 3-channel DAC 201, a determination unit 202, a 1-bit switch circuit 204, and an LED drive driver circuit 205, and is grounded by a virtual ground 206. .
  • the signal output from the 8-bit 3-channel DAC 201 is output to the LED drive driver circuit 205 via the 1-bit switch circuit 204 formed of a MOSFET, and only the on / off operation of the 1-bit switch circuit 204 is performed.
  • on / off control of each color of the LED is performed without rewriting the luminance information and color tone information written in the luminance control register (details will be described later based on FIGS. 13 to 15).
  • the determination unit 202 detects two data indicating “0” for the luminance control 3-bit signal and the color tone control 5-bit signal input to the DAC 201 and outputs two detection signals.
  • a detection signal is input from 202a and 202b and one of these two detectors 202a and 202b, and when an LED turn-off instruction signal (BK (i) DAOFF-P) is input, the determination signal is OR circuit 202c for output.
  • the detectors 202a and 202b normally output a signal “0”, but output a signal “1” as a detection signal during detection.
  • the OR circuit 20c outputs a signal “1” as a determination signal when a signal “1” as a detection signal is input from one or both of the detector 202a and the detector 202b.
  • the determination signal output from the OR circuit 202 c is input to the switch circuit 204.
  • the switch circuit 204 sets the output signal of the DAC 201 to zero. Therefore, the switch circuit 204 performs on / off control of the output of the D / A converter unit with respect to the LED driver.
  • the LED drive driver circuit 205 is an LED drive driver for controlling an LED array of one color (for example, R, G, B), and as shown in FIG. 2, an operational amplifier 205-1 and three transistors Each of the resistors 205-2, 205-3, and 205-4 is driven by switching one LED array corresponding to one color in three stages according to the voltage value of the pulsating flow. Therefore, a constant current driving circuit is configured.
  • the output peak value (maximum value) is 35 mA / 40 V (the current value is a value set for each switching stage).
  • the virtual ground 206 is grounded via a capacitor of about 1000 pF to 0.01 ⁇ F, and is used as a common ground for each circuit block and each chip in the LED luminance control device according to one embodiment of the present invention. Is done.
  • FIG. 3 shows a detailed circuit of the LED brightness control apparatus according to the first embodiment of the present invention.
  • the LED string 300 shown in FIG. 3 is an LED string connected to the LED drive driver circuit 205 shown in FIG. 2, and nine LEDs are assumed to be supplied with full-wave rectification of 24V AC to the LED brightness control device. LEDs 301 to 309 are connected in series.
  • the LED brightness control apparatus can control brightness of multiple gradations while maintaining a constant color tone by a 3-bit brightness control register as will be described later. This will be described later with reference to FIG.
  • the LED array 300 includes LED element modules 301 to 309 of RGB1 in the direction in which the current I 0 flows in FIG. 3, but the LED array 300 has the following three features. Yes.
  • the order of currents flowing through the LED element modules is different from the order of arrangement.
  • the order of the currents flowing through the LED element modules is different from the arrangement order, and as shown in FIG. 3, the LED element modules 302 ⁇ 304 ⁇ 306 ⁇ 308 ⁇ 309 ⁇ 307 ⁇ 305 ⁇ 303 ⁇ 301 are arranged in this order. Yes.
  • even-numbered (or odd-numbered) LED element modules in the LED array are connected in series from the top, and then connected in series from the rear of the odd-numbered (or even-numbered) LED element modules. This is for suppressing variation in luminance.
  • the arrangement order of the LED corresponding to each color of each LED element module is different for each module.
  • the LED array order of the odd-numbered LED element modules 301, 303, 305, and 307 in the LED array 300 is R ⁇ G ⁇ B from the top in the figure. Yes.
  • the LED arrangement order of the even-numbered LED element modules 302, 304, 306, and 308 is B ⁇ G ⁇ R from the top in the figure.
  • a resistor R is connected to the LED element corresponding to red (R). As shown in FIG. 3, in the LED array 300, a resistor R31 is connected between the LED element 304R (red) and the LED element 306R (red), and the LED element 307R (red) and the LED element 305R (red). A resistor R32 is connected between the two.
  • the mounted RGB element module 310 is a chip having a size of about 2.8 mm ⁇ 3.5 mm, but a larger element is used depending on the application, or a multicolor LED is not incorporated in the element.
  • Monochromatic LEDs that is, red, blue, green, and the like can be used in appropriate combination.
  • the LED brightness control device is logically configured to execute the following command system including each circuit such as a DAC. Therefore, the LED brightness control apparatus according to the present invention is characterized not only by the configuration on the hardware but also by the cooperative operation of the hardware and the software (this command format) that controls the hardware. .
  • the command format is a “control command” including a “start command” starting with E7 (hexadecimal number), a device operation instruction (1 byte), and a brightness setting instruction (2 bytes) as shown in the following table. And “end command” which ends with CC (hexadecimal notation).
  • the control command is a set of device operation instructions (1 byte) (+ luminance setting instruction (2 bytes)), but in the case of continuous operation, the device operation instruction (1 byte).
  • the brightness setting instruction can be continuously transmitted in units of 2 bytes.
  • the start command can define E3 (hexadecimal number display) in addition to E7 (hexadecimal number display). When the start command is E3, only the brightness setting value of 2 bytes fixed length is instructed. be able to.
  • the device operation instruction command has a fixed length of 1 byte and is a command for specifying a device and specifying its operation.
  • the device operation instruction command can be further specified in the upper 4 bits and lower 4 bits as follows.
  • a device address is specified in order to specify an element.
  • the device address is a value from 0 to F (hexadecimal notation) expressed by the upper 4 bits of the specified command, and the control command is executed only when the sent device address matches its own device address.
  • Banks 0 to 3 in the above table correspond to BK0 to BK3 in FIG. 1, respectively.
  • the determination unit 202 described above outputs a determination signal, and the DAC 201 sets the output signal to zero.
  • the brightness setting instruction command has a fixed length of 2 bytes, specifies a bank address with the upper 4 bits of the upper byte, and specifies a color with the lower 4 bits. Then, data is written to the DAC specified by the operation instruction command for the block specified by the lower 4 bits in the bank specified by the upper 4 bits.
  • the detailed specification example of the upper byte is as shown in the table below.
  • the detailed specification example of the lower byte is to set luminance information to be set in the DAC in this lower 1 byte.
  • the DAC of this element can be handled as a DAC divided into upper 3 bits and lower 5 bits or as an 8-bit DAC.
  • the DAC of each block is divided into upper 3 bits and lower 5 bits.
  • the lower 5 bits set the current value to be sent to the LED, and the upper 3 bits set the current value for controlling the luminance common to the block. Is intended to be.
  • the high-order DAC is composed of 3 bits, and can be specified in 8 gradations from 0 to 7.
  • the low-order DAC is composed of 5 bits, and has a feature that it can designate a linear gradation of 32 steps from 00h to 1Fh.
  • the determination unit 202 described above outputs a determination signal, and the DAC 201 sets the output signal to zero.
  • each DAC instantaneously sends a corresponding current value to each LED row.
  • the determination unit 202 sends a determination signal to the DAC 201, whereby the DAC 201 Since the analog signal generation process is not executed, the processing load on the DAC 201 is reduced.
  • FIGS. 10 to 12 show examples of processing flows when the LED of the conventional LED brightness control device is turned off / on using the command format according to the embodiment of the present invention.
  • 15 shows an example of a processing flow when the LED of the LED brightness control device according to the embodiment of the present invention is turned off / on using the command format according to the embodiment of the present invention. Yes.
  • FIG. 4 shows an initial value setting phase of the operation of gradually increasing and decreasing the luminance in the conventional LED luminance control apparatus.
  • the process proceeds to step S402, and the luminance information is set in the memory of the LED luminance control device (not shown).
  • step S403 a variable LED_ROW on the memory of the LED brightness control device (not shown) is initialized.
  • the variable LED_ROW is a counter (pointer) for managing a plurality of LED strings.
  • nine LED element modules are connected to the LED array, and 12 sets (four banks) of LED arrays are connected.
  • the maximum value of LED_ROW is 11.
  • the sending data of the first byte is a start command E7 (hexadecimal display)
  • the sending data of the second byte is 4 bits in the device address + 4 bits of operation instruction (0xE)
  • the sending of the third byte In the first order, 0x11 + red luminance + 0xCC (end command) is set.
  • 0x11 is an address that specifies red (R) of the first bank (BK0) in accordance with the command format described above, and by this specification, nine LED strings connected to the first-stage LED driver in FIG. All luminances can be set (hereinafter, the same is true for each LED row).
  • 0x12 is an address that specifies green (G) of the first bank (BK0)
  • 0x14 is an address that specifies blue (B) of the first bank (BK0).
  • 0x21 is an address that specifies red (R) of the second bank (BK1)
  • 0x22 is an address that specifies green (G) of the second bank (BK1)
  • 0x24 is the second bank. This is an address for designating blue (B) of (BK1).
  • 0x41 is an address that specifies red (R) of the third bank (BK2)
  • 0x42 is an address that specifies green (G) of the third bank (BK2)
  • 0x44 is the third bank.
  • 0x81 is an address that specifies red (R) of the fourth bank (BK3)
  • 0x82 is an address that specifies green (G) of the third bank (BK3)
  • 0x84 is the third bank. This is an address designating blue (B) of (BK2).
  • step S409 When the data set of the first to third bytes is completed, the process proceeds to step S409, and a generation command is sent to each LED element. Next, it progresses to step S411, LED_ROW is incremented, and it returns to step S404.
  • FIG. 5 is a phase in which the luminance is gradually decreased, and is a phase in which the luminance of the LED is lowered from the highest luminance to the lowest luminance.
  • the variable LED_LUMI is set to 7 (maximum luminance).
  • LED_LUMI is a variable that represents the brightness of the LED in 8 levels from 0 to 7. Of the 8 bits of the brightness control information register 103, this corresponds to 3 bits for brightness control. Accordingly, as the brightness control bit length increases, the variable LED_LUMI also increases (for example, the maximum value 255 of LED_LUMI for the variable LED_LUMI bit length of 8 bits).
  • the sending data of the first byte is a start command E7 (hexadecimal display)
  • the sending data of the second byte is 4 bits of device address + 4 bits of operation instruction (0xE)
  • sending data of the third byte In the first order, 0x11 + (LED_LUMI ⁇ red luminance / 8) + 0xCC (end command) is set.
  • 0x11 is an address that specifies red (R) of the first bank (BK0) in accordance with the command format described above, and by this specification, nine LED strings connected to the first-stage LED driver in FIG. All luminances can be set (hereinafter, the same is true for each LED row).
  • step S430 When the data set after the first to third bytes is completed, the process proceeds to step S430, and a generation command is sent to each LED element. Next, it progresses to step S432, LED_ROW is incremented, and it returns to step S425.
  • FIG. 6 is a phase in which the luminance is gradually increased, and is a phase in which the luminance of the LED is increased from the highest luminance to the lowest luminance.
  • the variable LED_LUMI is set to 0 (minimum luminance).
  • LED_LUMI is a variable that represents the brightness of the LED in 8 levels from 0 to 7. Of the 8 bits of the brightness control information register 103, this corresponds to 3 bits for brightness control. Accordingly, as the brightness control bit length increases, the variable LED_LUMI also increases (for example, the maximum value 255 of LED_LUMI for the variable LED_LUMI bit length of 8 bits).
  • the sending data of the first byte is a start command E7 (hexadecimal display)
  • the sending data of the second byte is 4 bits of device address + 4 bits of operation instruction (0xE)
  • sending data of the third byte In the first order, 0x11 + (LED_LUMI ⁇ red luminance / 8) + 0xCC (end command) is set.
  • 0x11 is an address that specifies red (R) of the first bank (BK0) in accordance with the command format described above, and by this specification, nine LED strings connected to the first-stage LED driver in FIG. All luminances can be set (hereinafter, the same is true for each LED row).
  • step S460 When the data set after the first to third bytes is completed, the process proceeds to step S460, and a generation command is sent to each LED element. Next, it progresses to step S462, LED_ROW is incremented, and it returns to step S455.
  • FIG. 7 shows an initial value setting phase of the operation of gradually increasing and decreasing the luminance in the LED luminance control apparatus according to the embodiment of the present invention.
  • the initial setting is possible for each LED row corresponding to each color of the LED, not the setting of each stage of the LED, due to the characteristics of the circuit shown in FIG. That is, in one processing loop, the LED row corresponding to red (R) of BK0 in FIG. 1, the LED row corresponding to red (R) of BK1, the LED row corresponding to red (R) of BK2, and BK3
  • the brightness setting for the LED rows corresponding to red (R) can be performed simultaneously.
  • step S501 when the operation is started (step S501), the process proceeds to step S502, and the luminance information is set in the memory of the LED luminance control device (not shown).
  • step S503 a variable LED_COLOR on the memory of the LED brightness control device (not shown) is initialized.
  • the variable LED_COLOR takes a value from 0 to 2, and is a counter (pointer) for managing the LED array corresponding to each color.
  • LED_COLOR 0
  • the LED row corresponding to red (R) of BK0 in FIG. 1 the LED row corresponding to red (R) of BK1, the LED row corresponding to red (R) of BK2, and BK3
  • LED row corresponding to green (G) of BK1, and green of BK2 are designated.
  • LED_COLOR 2
  • the LED array corresponding to blue (B) of BK0 in FIG. Assume that the LED column corresponding to B), the LED column corresponding to blue (B) of BK2, and the LED column corresponding to blue (B) of BK3 are designated.
  • the sending data of the first byte is a start command E7 (hexadecimal display)
  • the sending data of the second byte is 4 bits of device address + 4 bits of operation instruction (0xF)
  • sending data of the third byte In the first order, 0xF1 + red luminance + 0xCC (end command) is set.
  • 0xF1 is an address that designates red (R) of the first bank (BK0), the second bank (BK1), the third bank (BK2), and the fourth bank (BK3) at a time in accordance with the command format described above. By this designation, the LED row corresponding to red (R) of BK0 in FIG.
  • red luminance, green luminance, or blue luminance is set to zero regardless of luminance information.
  • 0xF2 is an address for designating green (G) of the first bank (BK0), the second bank (BK1), the third bank (BK2), and the fourth bank (BK3) at a time.
  • 0xF3 is an address for designating blue (B) of the first bank (BK0), the second bank (BK1), the third bank (BK2), and the fourth bank (BK3) at a time.
  • step S509 When the data set of the first to third bytes is completed, the process proceeds to step S509, and a generation command is sent to each LED element. Next, it progresses to step S511, LED_COLOR is incremented, and it returns to step S504.
  • FIG. 8 is a luminance gradually decreasing operation phase in the LED luminance control apparatus according to the embodiment of the present invention, and is a phase in which the luminance of the LED is decreased from the highest luminance to the lowest luminance.
  • the variable LED_LUMI is set to 7 (maximum luminance).
  • LED_LUMI is a variable that represents the brightness of the LED in 8 levels from 0 to 7. Of the 8 bits of the brightness control information register 103, this corresponds to 3 bits for brightness control. Accordingly, as the brightness control bit length increases, the variable LED_LUMI also increases (for example, the maximum value 255 of LED_LUMI for the variable LED_LUMI bit length of 8 bits).
  • step S527 the upper 3 bits (for brightness control) of all DACs can be executed by the following command at one time.
  • the first byte of the command is a start command
  • the upper 4 bits of the second byte are for designating the device address
  • the lower 4 bits of the second byte 0xC are instructions for writing the upper DAC in a single operation
  • 0xE7 in the third byte is an instruction for designating red, green, and blue LEDs in all banks 0 to 3
  • the subsequent 4th byte of 0xE0 is an information bit to be written to the DAC (high-order for luminance control) 3 bits are binary numbers with a maximum luminance of “111”
  • the lower 5 bits for color tone control are binary numbers “00000” in the sense of “nothing written”, and these are combined to become E0 in hexadecimal numbers)
  • the fifth byte of 0xCC is an end command.
  • step S530 When the luminance data set is completed, the process proceeds to step S530, and a generation command is sent to each LED element. And after measuring a fixed time (step S533), LED_LUMI is decremented (step S534) and it returns to step S523.
  • FIG. 9 is a luminance gradually increasing operation phase in the LED luminance control apparatus according to the embodiment of the present invention, and is a phase in which the luminance of the LED is increased from the lowest luminance to the highest luminance.
  • the variable LED_LUMI is set to 0 (minimum luminance).
  • LED_LUMI is a variable that represents the brightness of the LED in 8 levels from 0 to 7. Of the 8 bits of the brightness control information register 103, this corresponds to 3 bits for brightness control. Accordingly, as the brightness control bit length increases, the variable LED_LUMI also increases (for example, the maximum value 255 of LED_LUMI for the variable LED_LUMI bit length of 8 bits).
  • a determination signal is input from the determination unit 202, red luminance, green luminance, or blue luminance is set to zero regardless of luminance information.
  • step S557 the upper 3 bits (for brightness control) of all DACs can be executed at once by the following command.
  • the first byte of the command is a start command
  • the upper 4 bits of the second byte are for designating the device address
  • the lower 4 bits of the second byte 0xC are instructions for writing the upper DAC in a single operation 0xE7 in the third byte is an instruction for designating each of red, green, and blue LEDs of all banks 0 to 3
  • the subsequent byte 0x00 is an information bit to be written to the DAC (upper level for luminance control) 3 bits are binary numbers with the lowest luminance of “000”, and the lower 5 bits for color tone control are binary numbers “00000” in the sense that “nothing is written”, and these are combined to become 00 in hexadecimal number)
  • the fifth byte of 0xCC is an end command.
  • step S560 When the luminance data set is completed, the process proceeds to step S560, and a generation command is sent to each LED element. And after measuring a fixed time (step S563), LED_LUMI is decremented (step S564) and it returns to step S553.
  • the conventional LED brightness control apparatus when operated using the command according to the embodiment of the present invention, one multiplication / division calculation is performed for each LED column (12 in total in 12 stages).
  • the LED brightness control device according to the embodiment of the present invention is operated using the command format according to the embodiment of the present invention, all DACs are required.
  • FIG. 10 shows an initial value setting phase of the luminance blinking operation in the conventional LED luminance control apparatus.
  • the process proceeds to step S602, where the luminance information is set in the memory of the LED luminance control device (not shown).
  • step S603 a variable LED_ROW on the memory of the LED brightness control device (not shown) is initialized.
  • the variable LED_ROW is a counter (pointer) for managing a plurality of LED strings.
  • nine LED element modules are connected to the LED array, and 12 stages (four banks) of LED arrays are connected. Therefore, in step S603, As an example, the maximum value of LED_ROW is 11.
  • the sending data in the first byte is a start command E7 (hexadecimal display), and the sending data in the second byte is 4 bits for the device address + 4 bits (0xF) for the operation instruction, and 3 bytes.
  • 0x11 + red luminance + 0xCC end command
  • 0x11 is an address that specifies red (R) of the first bank (BK0) in accordance with the command format described above, and by this specification, nine LED strings connected to the first-stage LED driver in FIG. All luminances can be set (hereinafter, the same is true for each LED row).
  • 0x12 is an address that specifies green (G) of the first bank (BK0)
  • 0x14 is an address that specifies blue (B) of the first bank (BK0).
  • 0x21 is an address that specifies red (R) of the second bank (BK1)
  • 0x22 is an address that specifies green (G) of the second bank (BK1)
  • 0x24 is the second bank. This is an address for designating blue (B) of (BK1).
  • 0x41 is an address that specifies red (R) of the third bank (BK2)
  • 0x42 is an address that specifies green (G) of the third bank (BK2)
  • 0x44 is the third bank. This is an address designating blue (B) of (BK2).
  • 0x81 is an address that specifies red (R) of the fourth bank (BK3)
  • 0x82 is an address that specifies green (G) of the third bank (BK3)
  • 0x84 is the third bank. This is an address designating blue (B) of (BK2).
  • step S609 When the data set of the first to third bytes is completed, the process proceeds to step S609, and a generation command is sent to each LED element. Next, it progresses to step S611, LED_ROW is incremented, and it returns to step S604.
  • FIG. 11 shows a luminance extinguishing operation phase in which the LED luminance is set to the minimum luminance.
  • the sending data of the first byte is a start command E7 (hexadecimal display)
  • the sending data of the second byte is 4 bits of device address + 4 bits of operation instruction (0xF)
  • sending data of the third byte In the first order, 0x11 + 0x00 + 0xCC (end command) is set.
  • 0x11 is an address that specifies red (R) of the first bank (BK0) in accordance with the command format described above, and by this specification, nine LED strings connected to the first-stage LED driver in FIG. Can be set (hereinafter, the same applies to the LED rows in each stage).
  • step S629 When the data set after the first to third bytes is completed, the process proceeds to step S629, and a generation command is sent to each LED element. Next, it progresses to step S631, LED_ROW is incremented, and it returns to step S624.
  • FIG. 12 shows a luminance lighting operation phase in which the LED luminance is set to the maximum luminance.
  • the sending data of the first byte is a start command E7 (hexadecimal display)
  • the sending data of the second byte is a device address 4 bits + an operation instruction 4 bits (0xF)
  • the sending of the third and subsequent bytes In the first order, 0x11 + red luminance + 0xCC (end command) is set.
  • 0x11 is an address that specifies red (R) of the first bank (BK0) in accordance with the command format described above, and by this specification, nine LED strings connected to the first-stage LED driver in FIG. All luminances can be set (hereinafter, the same is true for each LED row).
  • step S659 When the data set after the first to third bytes is completed, the process proceeds to step S659, and a generation command is sent to each LED element. Next, it progresses to step S661, LED_ROW is incremented, and it returns to step S654.
  • FIG. 13 is an initial value setting phase of the brightness blinking operation in the LED brightness control apparatus according to the embodiment of the present invention.
  • the initial setting is possible for each LED row corresponding to each color of the LED, not the setting of each stage of the LED, due to the characteristics of the circuit shown in FIG. That is, in one processing loop, the LED row corresponding to red (R) of BK0 in FIG. 1, the LED row corresponding to red (R) of BK1, the LED row corresponding to red (R) of BK2, and BK3
  • the brightness setting for the LED rows corresponding to red (R) can be performed simultaneously.
  • steps S701 to S712 in FIG. 13 correspond to steps S501 to S512 in FIG.
  • FIG. 14 shows a turn-off operation phase in the LED brightness control apparatus according to the embodiment of the present invention.
  • the variable LED_BK takes a value from 0 to 3, and is a counter (pointer) for managing the LED string corresponding to each bank.
  • LED_BK 0
  • step S726 an on / off instruction for each bank is set as follows.
  • the first byte of the command is a start command
  • the upper 4 bits of the second byte are for specifying a device address
  • the lower 4 bits of the second byte 0x0 are the first bank in a single operation.
  • the (BK0) LED is instructed to be turned off, and 0xCC in the third byte is an end command.
  • step S729 When the on / off instruction for each bank is completed, the process proceeds to step S729, and a generation command is sent to each LED element. Then, LED_BK is incremented (step S731), and the process returns to step S724.
  • the conventional LED brightness control apparatus when operated using the command according to the embodiment of the present invention, one setting is made for each LED row (12 times in total for all 12 stages).
  • the LED brightness control device according to the embodiment of the present invention when operated using the command format according to the embodiment of the present invention, the on / off control is performed for each bank. This is sufficient, and in the luminance information, if either one or both of the luminance control 3-bit signal and the color tone control 5-bit signal are “0”, the DAC performs arithmetic processing. Note that processing is reduced by setting the output off without doing so.
  • FIG. 15 is a lighting operation phase in the LED brightness control apparatus according to the embodiment of the present invention.
  • the process proceeds to step S753, and LED brightness control (not shown) is performed.
  • the variable LED_BK takes a value from 0 to 3, and is a counter (pointer) for managing the LED string corresponding to each bank.
  • LED_BK 0
  • An LED string corresponding to BK2 3 an LED string corresponding to BK3 in FIG. 1 is specified.
  • step S756 on / off for each bank is instructed at a time as follows.
  • the first 1 byte of the above command is the start command
  • the upper 4 bits of the second byte are for designating the device address
  • the lower 4 bits of the second byte 0x1 are the first bank in a single operation (BK0) LED lighting is instructed
  • 0xCC in the third byte is an end command.
  • step S759 When the on / off command set for each bank is completed, the process proceeds to step S759, and a generation command is sent to each LED element. Then, LED_BK is incremented (step S761), and the process returns to step S754.
  • the LED brightness control apparatus when the LED brightness control apparatus according to the embodiment of the present invention is operated using the command format according to the embodiment of the present invention, the operation of the conventional LED brightness control apparatus
  • the red luminance, green luminance, or blue luminance is set to zero regardless of luminance information, so gradation processing or blinking is performed.
  • Processing and the like can be operated lightly, and as a result, further improved LED brightness control for enhancing the expressive power of the LED units and LED arrays is possible.
  • the determination unit 202 is configured to output the determination signal to the switch circuit 204 and set the output of the DAC 201 to zero, as shown in FIG.
  • the present invention is not limited to this, and other configurations, for example, as shown in FIGS. 16 and 17 may be used.
  • the LED brightness control device 100 is configured so that the determination signal of the determination unit 202 is sent to a second switch unit (or second switch circuit) 203 provided on the output line of the DAC 201. Yes.
  • the second switch unit 203 is provided between the output of the DAC 201 and the input of the switch circuit 204.
  • the switch circuit 204 is also referred to as a “first switch circuit 204” for distinction from the second switch circuit 203.
  • the second switch unit 203 turns off the output of the DAC 201 when the determination signal from the determination unit 202 is input.
  • the determination signal from the determination unit 202 is also sent to the DAC 201 as indicated by a dotted line in FIG.
  • the second embodiment operates in the same manner as the LED luminance control device 100 shown in FIGS. 1 to 3, and when the determination signal is output from the determination unit 202, The switch unit 203 turns off the output of the DAC 201, thereby turning off the LED string. Further, the DAC 201 stops the processing in response to the input of the determination signal. Accordingly, as in the LED luminance control apparatus 100 shown in FIGS. 1 to 3, data in which at least one of the luminance control information bits and the color tone control information bits from the luminance control information register 103 is “0”. , The output of the DAC 201 is turned off by the second switch unit 203 regardless of the processing of the DAC 201. As a result, the processing of the DAC 201 is reduced.
  • the LED brightness control device is configured such that the determination signal of the determination unit 202 is sent to the DAC 201 together with the switch unit 204.
  • the switch brightness is similar to that of the LED brightness control device 100 shown in FIGS. 1 to 3, and when the determination signal is output from the determination unit 202, the switch unit 204 is , The output of the DAC 201 is turned off, and thereby the LED row is extinguished. At the same time, the DAC 201 stops the processing in response to the input of the determination signal. Accordingly, as in the LED luminance control apparatus 100 shown in FIGS. 1 to 3, data in which at least one of the luminance control information bits and the color tone control information bits from the luminance control information register 103 is “0”. , The output of the DAC 201 is turned off by the switch unit 204 without depending on the processing of the DAC 201. As a result, the processing of the DAC 201 is reduced.
  • the determination signal of the determination unit 202 may be transmitted only to the DAC 201 without being transmitted to the switch unit 204.
  • the DAC 201 can stop processing and turn off the output of the DAC 201 based on the determination signal from the determination unit 202 by using the function.
  • FIG. 18 shows a block configuration of an LED brightness control apparatus according to another embodiment of the present invention.
  • the LED brightness control device 800 is different from the LED brightness control device 100 shown in FIG. 1 only in that a control circuit 801 is provided instead of the serial communication control unit 101 and the command decoder 102. Since it is a structure, the same code
  • the control circuit 801 sends a lighting control signal to the luminance control information register 103 when a lighting instruction signal is input or when a lighting instruction operation button (not shown) is operated. Also, the control circuit 801 sends out the turn-off control signal to the luminance control information register 103 when a turn-off instruction signal is input or when a turn-off instruction operation button (not shown) is operated.
  • the luminance control information register 103 converts the information bits for luminance control and the information bits for color tone that are set in advance based on the lighting control signal or the lighting extinction control signal from the control circuit 801 into the D / A converter unit 105. To send. Accordingly, the D / A converter unit 105 drives and controls each LED driver 107 and controls the LED row for each RGB in the same manner as the LED brightness control device 100 shown in FIG.
  • the lighting control signal sent from the control circuit 801 may include information for luminance control and color tone control.
  • the luminance control information register 103 converts the designated information bit for luminance control and information bit for color tone control into the D / A converter unit 105 based on the lighting control signal including information for luminance control and color tone control.
  • the control circuit 801 includes a brightness adjustment operation unit and a color tone control operation unit, so that desired brightness adjustment and color tone adjustment can be performed.
  • the control circuit 801 may simply be a switch circuit that switches on or off.
  • the control circuit 801 may be a switch that can be turned on / off in order to control lighting and extinguishing of the LED row.
  • the luminance control information register 103 causes the information bit for luminance control and the information bit for color tone control set in advance to the D / A converter unit 105 by turning on or off by a switch circuit (or simply a switch). Send it out.
  • the present invention can be directly driven by an AC input, suppresses the generation of flicker and harmonics, realizes low power consumption, and sets the brightness of the LED (that is, the current value passed through the LED). Irrespective of this, it is possible to realize an LED lighting device that enables adjustment of luminance as a lighting device.
  • LED brightness control apparatus 101 Serial communication control part 102 Command decoding part 103 Brightness control information register 105 D / A converter part 106 1 bit switch circuit (MOSFET) 107 LED driver 108 Internal voltage generator (for communication, brightness information retention, LED drive, control, etc.) 200 DAC / LED drive circuit 201 8-bit 3-channel DAC (CMOS) 202 Determination Unit 203 Second Switch Circuit 204 1-bit Switch Circuit (MOSFET) 205 LED driver circuit 206 Virtual ground 300 LED array 301 to 309 LED element module 800 LED brightness control device 801 control circuit

Landscapes

  • Control Of El Displays (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

L'invention concerne un dispositif de commande de luminosité de DEL (100) qui est doté : de moyens de commande (101, 102); et d'un registre d'informations de commande de luminosité (103), d'une unité de conversion N/A (105), et d'un pilote de DEL (107) qui sont connectés pour chaque rangée de DEL pour commander plusieurs rangées de DEL. Le dispositif de commande de luminosité de DEL (100) est conçu de sorte que le registre d'informations de commande de luminosité stocke des bits d'information pour la commande de luminosité et des bits d'information pour la commande de la tonalité de couleur, et l'unité de conversion N/A réalise une conversion N/A sur la base des bits d'information pour la commande de luminosité et des bits d'information pour la commande de la tonalité de couleur et désactive la sortie vers le pilote de DEL (107) ou définit la sortie sur zéro lorsque les bits d'information pour la commande de luminosité et/ou les bits d'information pour la commande de la tonalité de couleur sont des données indiquant « 0 ».
PCT/JP2014/080787 2013-11-22 2014-11-20 Dispositif de commande de luminosité de del WO2015076339A1 (fr)

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JP2013-241563 2013-11-22
JP2013241563 2013-11-22

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005184020A (ja) * 2005-01-12 2005-07-07 Hunet Inc Ｌｅｄ駆動装置及びｌｅｄ駆動方法
JP2006054362A (ja) * 2004-08-13 2006-02-23 Sanyo Electric Co Ltd Ｌｅｄ制御回路
JP2006147171A (ja) * 2004-11-16 2006-06-08 Yokogawa Electric Corp 光源装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006054362A (ja) * 2004-08-13 2006-02-23 Sanyo Electric Co Ltd Ｌｅｄ制御回路
JP2006147171A (ja) * 2004-11-16 2006-06-08 Yokogawa Electric Corp 光源装置
JP2005184020A (ja) * 2005-01-12 2005-07-07 Hunet Inc Ｌｅｄ駆動装置及びｌｅｄ駆動方法

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