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WO2018121126A1 - Circuit d'attaque de rétro-éclairage à gradation locale et dispositif électronique - Google Patents

Circuit d'attaque de rétro-éclairage à gradation locale et dispositif électronique Download PDF

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Publication number
WO2018121126A1
WO2018121126A1 PCT/CN2017/111895 CN2017111895W WO2018121126A1 WO 2018121126 A1 WO2018121126 A1 WO 2018121126A1 CN 2017111895 W CN2017111895 W CN 2017111895W WO 2018121126 A1 WO2018121126 A1 WO 2018121126A1
Authority
WO
WIPO (PCT)
Prior art keywords
led lamp
power supply
led
supply selection
selection switch
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2017/111895
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English (en)
Chinese (zh)
Inventor
杨福军
王坚
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shenzhen TCL Digital Technology Co Ltd
Original Assignee
Shenzhen TCL Digital Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shenzhen TCL Digital Technology Co Ltd filed Critical Shenzhen TCL Digital Technology Co Ltd
Publication of WO2018121126A1 publication Critical patent/WO2018121126A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • G09G3/342—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source

Definitions

  • the present invention relates to the field of backlight driving technologies, and in particular, to a LOCAL DIMMING backlight driving circuit and an electronic device.
  • the driving IC generally drives one LED lamp by adjusting the duty ratio of a driving switch, so that each LED lamp passes a constant current, thereby changing the brightness of each LED lamp.
  • the above driving method uses a large number of driving switches, and the driving IC has a limited pin. Therefore, it is necessary to use a plurality of driving ICs to simultaneously drive a plurality of driving switches, and the circuit design is complicated and the cost is high.
  • the main object of the present invention is to provide a LOCAL DIMMING backlight driving circuit and an electronic device, aiming at solving LOCAL in the prior art.
  • the DIMMING backlight driving circuit uses more driving ICs to drive multiple driving switches at the same time, resulting in complicated circuit design and high cost.
  • the LOCAL DIMMING backlight drive circuit includes:
  • the backlight module comprising a plurality of LED lights arranged in a matrix
  • a plurality of power supply selection switches wherein the input ends of the plurality of power supply selection switches are connected to the driving power source; the output ends of the plurality of power supply selection switches are connected in one-to-one correspondence with the anodes of the plurality of LED lamps;
  • each of the driving switches is connected to cathodes of at least two of the LED lamps, and an output end of each of the driving switches is grounded via the current sink;
  • an LED driving module for driving each of the driving switches to perform dimming
  • a control module for controlling operation of the LED driving module, and controlling a plurality of the power supply selection switches to be turned on/off.
  • the LED lamp in the backlight module is divided into an equal number of first LED lamp groups and second LED lamp groups in the left-right direction; the number of the power supply selection switches is two, respectively, the first power supply selection switch And a second power supply selection switch, the anodes of the LED lamps in the first LED lamp group are connected to the first power supply selection switch, and the anodes of the LED lamps in the second LED lamp group are both Power supply selection switch connection;
  • the first LED lamp group is located in the A-th column, the B-th row of LED lamps and the second LED lamp group corresponding to the cathodes of the LED lamp in the A-th column and the B-th row position and the same drive
  • the output of the switch is connected.
  • the LED lamp in the backlight module is divided into an equal number of first LED lamp group and second LED lamp group in the up and down direction; the number of the power supply selection switches is two, respectively, the first power supply selection switch And a second power supply selection switch, the anodes of the LED lamps in the first LED lamp group are connected to the first power supply selection switch, and the anodes of the LED lamps in the second LED lamp group are both Power supply selection switch connection;
  • the first LED lamp group is located in the LEDs of the A-th column and the B-th row, and the cathode of the LED lamp corresponding to the A-column and the B-th row in the second LED lamp group and the same
  • the input terminals of the drive switch are connected.
  • the backlight module is divided into an odd-numbered first LED light group and an even-numbered second LED light group in an up-and-down direction; the number of the power supply selection switches is two, and the first power supply selection switch and a second power supply selection switch, wherein an anode of the LED lamp in the first LED lamp group is connected to the first power supply selection switch, and an anode of the LED lamp in the second LED lamp group is connected to the second power supply Select switch connection;
  • Each of the two LED lamps disposed adjacent to the LED lamp in the first LED lamp group and the LED lamp in the second LED lamp group is connected to the input end of the same drive switch.
  • the backlight module is divided into an odd-numbered first LED lamp group and an even-numbered second LED lamp group in the left-right direction; the number of the power supply selection switches is two, and the first power supply selection switch is respectively And a second power supply selection switch, wherein the anodes of the LED lamps in the first LED lamp group are connected to the first power supply selection switch, and the anodes of the LED lamps in the second LED lamp group are both the second and the second Power supply selection switch connection;
  • Each of the two LED lamps disposed adjacent to the LED lamp in the first LED lamp group and the LED lamp in the second LED lamp group is connected to the input end of the same drive switch.
  • the backlight module comprises a plurality of LED units, each of the LED units comprises a first LED lamp at the upper left, a second LED lamp at the upper right, a third LED lamp at the lower left and a right LED a fourth LED lamp below;
  • the number of the power supply selection switches is four, and is respectively a first power supply selection switch, a second power supply selection switch, a third power supply selection switch, and a fourth power supply selection switch;
  • each of the LEDs An anode of the first LED lamp in the unit is connected to the first power supply selection switch, and an anode of the second LED lamp in each of the LED units is connected to the second power supply selection switch, in each of the LED units
  • the anode of the third LED lamp is connected to the third power supply selection switch, and the anode of the fourth LED lamp in each of the LED units is connected to the fourth power supply selection switch;
  • the cathodes of the four LED lamps in the same LED unit are connected to the input terminals of the same drive switch.
  • an output end of each of the power supply selection switches is correspondingly interconnected with an anode of a row of the LED lamps; a cathode of each of the LED lamps is connected to an input end of a driving switch.
  • the invention also proposes an electronic device comprising and as described above for LOCAL a DIMMING backlight driving circuit, the circuit comprising: a driving power source; a backlight module, the backlight module comprising a plurality of LED lights arranged in a matrix; a plurality of power supply selection switches, an input end of the plurality of power supply selection switches and the a driving power connection; an output end of the plurality of power supply selection switches is connected in one-to-one correspondence with the anodes of the plurality of LED lamps; a plurality of driving switches, an input end of each of the driving switches and at least two of the LED lamps a cathode connection, an output of each of the driving switches is grounded via a current sink A; and an LED driving module for driving each of the driving switches for dimming, for controlling operation of the LED driving module, and A control module that controls a plurality of the power supply selection switches to be turned on/off.
  • the present invention LOCAL
  • the DIMMING backlight driving circuit sets the control module to input the control command signal outside the control module, demodulates the command signal, and re-encodes it into a corresponding control signal and outputs it to the LED driving module to control the LED driving module output.
  • driving the signal to drive the corresponding driving switch thereby controlling and adjusting the duty ratio of each driving switch to adjust the brightness of each LED lamp
  • the control module is still controlling more when receiving the command signal output by the upper computer.
  • the power supply selection switch is turned on/off to control the corresponding LED light on/off.
  • the LED driving module in the invention drives a plurality of driving switches, and each driving switch controls at least two LED lamps.
  • the DIMMING backlight drive circuit reduces the number of driver ICs and reduces production costs.
  • FIG. 1 is a schematic diagram of functional modules of a LOCAL DIMMING backlight driving circuit applied to an electronic device according to the present invention
  • FIG. 2 is a schematic structural view of a first embodiment of the LOCAL DIMMING backlight driving circuit of FIG. 1;
  • FIG. 3 is a schematic structural view of a second embodiment of the LOCAL DIMMING backlight driving circuit of FIG. 1;
  • FIG. 4 is a schematic structural view of a third embodiment of the LOCAL DIMMING backlight driving circuit of FIG. 1;
  • FIG. 5 is a schematic structural view of a fourth embodiment of the LOCAL DIMMING backlight driving circuit of FIG. 1;
  • FIG. 6 is a schematic structural view of a fifth embodiment of the LOCAL DIMMING backlight driving circuit of FIG. 1;
  • FIG. 7 is a schematic structural view of a sixth embodiment of the LOCAL DIMMING backlight driving circuit of FIG. 1.
  • the directional indication is only used to explain in a certain posture (as shown in the drawing)
  • the relative positional relationship between the components, the motion situation, and the like if the specific posture changes, the directional indication also changes accordingly.
  • first”, “second”, etc. in the embodiments of the present invention, the description of the "first”, “second”, etc. is used for the purpose of description only, and is not to be construed as an Its relative importance or implicit indication of the number of technical features indicated.
  • features defining “first” or “second” may include at least one of the features, either explicitly or implicitly.
  • the technical solutions between the various embodiments may be combined with each other, but must be based on the realization of those skilled in the art, and when the combination of the technical solutions is contradictory or impossible to implement, it should be considered that the combination of the technical solutions does not exist. It is also within the scope of protection required by the present invention.
  • a LOCAL DIMMING backlight driving circuit proposed by the present invention.
  • the LOCAL The DIMMING backlight driving circuit includes a driving power source 10, an LED driving module 20, a control module 30, a plurality of power supply selection switches 40, a plurality of driving switches 50, a current sink A, and a backlight module 60.
  • the current sink A is used to ensure that the current flowing through the LED lamp is constant when the LED lamp connected thereto is turned on.
  • the driving power source 10 is used to provide a driving voltage when the backlight module 60 operates.
  • the backlight module 60 includes a plurality of LED lamps arranged in a matrix, and different numbers of LED lamps can form backlight modules 60 of different sizes to provide a backlight source for a display screen of a multimedia device such as a television.
  • Both the control module 30 and the LED driving module 20 can implement a control function by using a discrete component to form a control circuit or an integrated chip.
  • the control module 30 is preferably implemented by using an integrated chip MCU
  • the LED driving module 20 is preferably implemented by using an integrated chip driving IC.
  • the MCU is configured to demodulate the command signal when receiving the command signal output by the upper computer, and re-encode and convert the signal into a corresponding control signal, and then output the signal to the driving IC to control the driving IC to output the corresponding driving signal.
  • the corresponding driving switch 50 is driven to control the duty ratio of each driving switch 50 to adjust the brightness of each LED lamp.
  • the MCU is further configured to control a plurality of corresponding power supply selection switches 40 to be turned on/off when receiving the command signal output by the upper computer to control the corresponding LED lights to be turned on/off.
  • the input ends of the plurality of power supply selection switches 40 are connected to the driving power source 10; the output ends of the plurality of power supply selection switches 40 are connected in one-to-one correspondence with the anodes of the plurality of LED lamps; and the plurality of power supply selection switches 40 are subjected to
  • the control module 30 controls and turns on/off when receiving the control signal output by the control module 30 to control the LED light to be connected to/from the power source.
  • each of the drive switches 50 is coupled to a cathode of at least two of the LED lamps, and an output of each of the drive switches 50 is grounded via the current sink A.
  • at least two LED lamps can be multiplexed with one driving switch 50, that is, the LED driving module 20 can adjust the brightness of at least two LED lamps by driving the duty ratio of one driving switch 50 to reduce the LED driving module. 20 drive paths, thereby reducing the number of drive ICs.
  • the present invention LOCAL The DIMMING backlight driving circuit is configured to control the module 30, and when receiving the externally input control command signal, the control module 30 demodulates the command signal, and re-encodes the signal into a corresponding control signal, and outputs the signal to the LED driving module 20, Controlling the LED driving module 20 to output a corresponding driving signal to drive the corresponding driving switch 50, thereby controlling the duty ratio of each driving switch 50 to adjust the brightness of each LED lamp, while the control module 30 is still receiving the upper position.
  • a plurality of corresponding power supply selection switches 40 are controlled to be turned on/off to control the corresponding LED lights to be turned on/off.
  • the LED driving module 20 in the present invention drives a plurality of driving switches 50, and each driving switch 50 controls at least two LED lamps.
  • adjusting the duty ratio of a driving switch 50 can simultaneously achieve adjustment of at least two LED lamps.
  • the function of brightness achieves the purpose of reducing the number of driving paths of the LED driving module 20.
  • the present invention LOCAL The DIMMING backlight drive circuit reduces the number of driver ICs and reduces production costs.
  • the LED lamps in the backlight module 60 are divided into an equal number of first LED light groups 61 and second LED light groups 62 in the left-right direction; the power supply selection switch 40 The number is two, which are respectively a first power supply selection switch KA and a second power supply selection switch KB, and an anode of the LED lamp in the first LED lamp group 61 is connected to the first power supply selection switch KA, The anodes of the LED lamps in the two LED lamp groups 62 are all connected to the second power supply selection switch KB;
  • the first LED lamp group 61 is located at the cathode of the LED lamp of the A-th column and the B-th row and the second LED lamp group 62 corresponding to the LED lamp in the A-th column and the B-th row position.
  • the output of one of the drive switches 50 is connected. As shown in FIG. 2, the drive switches 50 are K1 to KN, respectively.
  • the LED lamps in the backlight module 60 are divided into an equal number of the first LED lamp group 61 and the second LED lamp group 62 in the left-right direction.
  • the backlight module 60 is arranged in a matrix of 12 horizontal rows (B1...B12) and 24 vertical columns (A1...A24) as an example.
  • the first to twelfth columns are the first LED lamp group 61
  • the thirteenth column to the twenty-fourth column are the second LED lamp group 62.
  • the first LED lamp group 61 is located in the LEDs of the A-th column, the B-th row, and the second LED lamp group 62 corresponding to the cathodes of the LED lamps in the A-th column and the B-th row position, and the same driving switch 50.
  • the output terminals are connected, that is, the lamps of the same position of the first LED lamp group 61 and the second LED lamp group 62 are controlled by a drive switch 50.
  • (B1, A1) and (B1, A13) represent the same position, and so on, (B2, A1) and (B2, A13), (B1, A2) and (B1, A14), etc. all indicate the first LED.
  • the LED lamps in the first LED lamp group 61 are all connected to the power source through the first power supply selection switch KA, and the LED lamps in the second LED lamp group 62 are all connected to the power source through the second power supply selection switch KB, and the control module 30 will One frame signal is divided into upper and lower two half field signals and output to the LED driving module 20. Specifically, when the first half field signal is output, the control module 30 controls the first power supply selection switch KA to be turned on, thereby turning on the LED light in the first LED light group 61 (lighting), and the LED driving control module 30 receives the signal. The brightness of each LED light on the first LED group 61 is adjusted when the first half signal, that is, the brightness signal of the LED lamp.
  • the control module 30 controls the second power supply selection switch KB to be turned on, so that the LED light in the second LED light group 62 is turned on (lighted), and the LED drive control module 30 receives the second half signal, that is, When the brightness signal of the LED lamp is used, the brightness of each LED lamp on the second LED lamp group 62 is adjusted.
  • the LED lamps in the backlight module 60 are divided into an equal number of first LED light groups 61 and second LED light groups 62 in the up and down direction; the power supply selection switch 40 The number is two, which are respectively a first power supply selection switch KA and a second power supply selection switch KB, and an anode of the LED lamp in the first LED lamp group 61 is connected to the first power supply selection switch KA, The anodes of the LED lamps in the two LED lamp groups 62 are all connected to the second power supply selection switch KB;
  • the first LED lamp group 61 is located at the cathode of the LED lamp of the A-th column and the B-th row and the second LED lamp group 62 corresponding to the LED lamp in the A-th column and the B-th row position.
  • the input terminals of one of the drive switches 50 are connected. As shown in FIG. 3, the drive switches 50 are K1 to KN, respectively.
  • the LED lamps in the backlight module 60 are divided into an equal number of the first LED lamp group 61 and the second LED lamp group 62 in the up and down direction.
  • the backlight module 60 is arranged in a matrix of 12 horizontal rows (B1...B12) and 24 vertical columns (A1...A24) as an example.
  • the horizontal to sixth horizontal row is the first LED lamp group 61
  • the seventh to twelfth horizontal rows are the second LED lamp group 62.
  • the first LED lamp group 61 is located in the LEDs of the A-th column, the B-th row, and the second LED lamp group 62 corresponding to the cathodes of the LED lamps in the A-th column and the B-th row position, and the same driving switch 50.
  • the output terminals are connected, that is, the lamps of the same position of the first LED lamp group 61 and the second LED lamp group 62 are controlled by a drive switch 50.
  • (B1, A1) and (B7, A1) represent the same position, and so on, (B1, A2) and (B7, A2), (B2, A1) and (B8, A1), (B2, A2) And (B8, A2) and the like indicate the same positions of the first LED lamp group 61 and the second LED lamp group 62.
  • the LED lamps in the first LED lamp group 61 are all connected to the power source through the first power supply selection switch KA, and the LED lamps in the second LED lamp group 62 are all connected to the power source through the second power supply selection switch KB, and the control module 30 will One frame signal is divided into upper and lower two half field signals and output to the LED driving module 20. Specifically, when the first half field signal is output, the control module 30 controls the first power supply selection switch KA to be turned on, thereby turning on the LED light in the first LED light group 61 (lighting); the LED driving control module 30 is receiving The brightness of each LED light on the first LED group 61 is adjusted when the first half signal, that is, the brightness signal of the LED lamp.
  • the control module 30 controls the second power supply selection switch KB to be turned on, so that the LED light in the second LED light group 62 is turned on (lighted), and the LED drive control module 30 receives the second half signal, that is, When the brightness signal of the LED lamp is used, the brightness of each LED lamp on the second LED lamp group 62 is adjusted.
  • the backlight module 60 is divided into an odd-numbered first LED lamp group 61 and an even-numbered second LED lamp group 62 in an up-and-down direction; the number of the power supply selection switches 40 is two.
  • the first power supply selection switch KA and the second power supply selection switch KB respectively, the anodes of the LED lamps in the first LED lamp group 61 are connected to the first power supply selection switch KA, the second LED The anode of the LED lamp in the lamp group 62 is connected to the second power supply selection switch KB;
  • Each of the two LED lamps disposed adjacent to the LED lamp in the first LED lamp group 61 and the LED lamp in the second LED lamp group 62 is connected to the input end of the same driving switch 50, as shown in FIG.
  • the drive switches 50 are respectively K1 to KN.
  • the backlight module 60 is divided into two groups of the first LED lamp group 61 and the even-numbered second LED lamp group 62 in an odd row in the up and down direction.
  • the backlight module 60 is arranged in a matrix of 12 horizontal rows (B1...B12) and 24 vertical columns (A1...A24) as an example.
  • B1, B3, B5, B7, B9, and B11 are the first LED lamp group 61
  • the horizontal rows B2, B4, B6, B8, B10, and B12 are the second LED lamp group 62.
  • the two LED lamps adjacent in the vertical direction are controlled by the same drive switch 50.
  • the LED lamps in the first LED lamp group 61 are all connected to the power source through the first power supply selection switch KA, and the LED lamps in the second LED lamp group 62 are all connected to the power source through the second power supply selection switch KB.
  • the control module 30 divides a frame signal into upper and lower half field signals and outputs the signal to the LED driving module 20.
  • the control module 30 controls the first power supply selection switch KA to be turned on, thereby allowing the first LED lamp group 61 to be The LED light is turned on (lighted), and the LED drive control module 30 adjusts the brightness of each LED light on the first LED light group 61 when receiving the first half field signal, that is, the brightness signal of the LED light.
  • the control module 30 controls the second power supply selection switch KB to be turned on, so that the LED light in the second LED light group 62 is turned on (lighted), and the LED drive control module 30 receives the second half signal, that is, When the brightness signal of the LED lamp is used, the brightness of each LED lamp on the second LED lamp group 62 is adjusted.
  • the backlight module 60 is divided into an odd-numbered first LED lamp group 61 and an even-numbered second LED lamp group 62 in the left-right direction; the number of the power supply selection switches 40
  • the first power supply selection switch KA and the second power supply selection switch KB are respectively connected to the first power supply selection switch KA, wherein the first power supply selection switch KA is connected to the first power supply selection switch KA.
  • the anodes of the LED lamps in the two LED lamp groups 62 are all connected to the second power supply selection switch KB;
  • Each of the two LED lamps disposed adjacent to the LED lamp in the first LED lamp group 61 and the LED lamp in the second LED lamp group 62 is connected to the input end of the same drive switch 50.
  • the drive switches 50 are K1 to KN, respectively.
  • the backlight module 60 is divided into two groups of the first LED lamp group 61 of the odd-numbered columns and the second LED lamp group 62 of the even-numbered columns in the left-right direction.
  • the backlight module 60 is arranged in a matrix of 12 horizontal rows (B1...B12) and 24 vertical columns (A1...A24) as an example, wherein the vertical column is illustrated.
  • A1, A3, A5, A7, A9, A11...A23 are the first LED lamp group 61
  • the columns A2, A4, A6, A8, A10, A12, ... A24 are the second LED lamp group 62.
  • the two LED lights adjacent to each other in the horizontal direction are controlled by the same drive switch 50.
  • the LED lamps in the first LED lamp group 61 are all connected to the power source through the first power supply selection switch KA, and the LED lamps in the second LED lamp group 62 are all connected to the power source through the second power supply selection switch KB.
  • the control module 30 divides a frame signal into upper and lower half field signals and outputs the signal to the LED driving module 20.
  • the control module 30 controls the first power supply selection switch KA to be turned on, thereby allowing the first LED lamp group 61 to be The LED light is turned on (lighted), and the LED drive control module 30 adjusts the brightness of each LED light on the first LED light group 61 when receiving the first half field signal, that is, the brightness signal of the LED light.
  • the control module 30 controls the second power supply selection switch KB to be turned on, so that the LED light in the second LED light group 62 is turned on (lighted), and the LED drive control module 30 receives the second half signal, that is, When the brightness signal of the LED lamp is used, the brightness of each LED lamp on the second LED lamp group 62 is adjusted.
  • the backlight module 60 includes a plurality of LED units (not shown), each of the LED units including a first LED light at the upper left and a second at the upper right.
  • the number of the power supply selection switches 40 is four, and is respectively a first power supply selection switch KA, a second power supply selection switch KB, a third power supply selection switch KC and a fourth power supply selection switch KD;
  • the anode of the first LED lamp in each of the LED units is connected to the first power supply selection switch KA, and the second LED lamp in each of the LED units
  • the anodes are connected to the second power supply selection switch KB, and the anodes of the third LED lamps in each of the LED units are connected to the third power supply selection switch KC, and the fourth LED lamp in each of the LED units
  • the anodes are all connected to the fourth power supply selection switch KD;
  • the cathodes of the four LED lamps in the same LED unit are connected to the input terminals of the same drive switch 50.
  • the drive switches 50 are respectively K1 to KN.
  • the backlight module 60 is divided into a plurality of LED units, each LED unit includes a first LED lamp located at the upper left, a second LED lamp located at the upper right, and a third LED lamp located at the lower left and located at the right.
  • the fourth LED lamp below, that is, each adjacent four LED lamps is an LED unit.
  • the backlight module 60 is 12 horizontal rows (B1...B12).
  • the matrix arrangement of 24 vertical columns (A1...A24) is described as an example, wherein (B1, A1), (B1, A2), (B2, A1), (B2, A2) constitute an LED unit, Such pushes (B1, A3), (B1, A4), (B2, A3), (B2, A4) constitute another LED unit, (B3, A1), (B3, A2), (B4, A1), ( B4, A2) constitutes another LED unit, each LED unit being controlled by the same drive switch 50.
  • Each of the first LED lamps is connected to the power source through the first power supply selection switch KA, and each of the second LED lamps is connected to the power source through the second power supply selection switch KB, and each of the third LED lamps passes through the third power supply selection switch KC.
  • the power source is connected, and each of the fourth LED lights is connected to the power source through the fourth power supply selection switch KD.
  • the control module 30 divides a frame signal into four subfields and outputs it to the LED driving module 20.
  • the control module 30 controls the first power supply selection switch KA to be turned on, so that all the first LED lamps are turned on (
  • the LED drive control module 30 receives the first subfield signal, that is, the brightness signal of the LED lamp, the brightness of each of the first LED lamps is adjusted.
  • the control module 30 controls the second power supply selection switch KB to be turned on, so that all the second LED lamps are turned on (lighted), and the LED driving control module 30 receives the second subfield signal.
  • the control module 30 controls the third power supply selection switch KC to be turned on, so that all the third LED lamps are turned on (lighted), and the LED driving control module 30 receives the third subfield signal. That is, when the brightness signal of the LED lamp is used, the brightness of each of the third LED lamps is adjusted.
  • the control module 30 controls the fourth power supply selection switch KD to be turned on, so that all the fourth LED lamps are turned on (lighted), and the LED driving control module 30 receives the fourth subfield signal. That is, when the brightness signal of the LED lamp is used, the brightness of each of the fourth LED lamps is adjusted.
  • an output end of each of the power supply selection switches 40 is interconnected with an anode of a row of the LED lamps; a cathode of each column of the LED lamps corresponds to a drive switch 50. The input is connected.
  • the power supply selection switch 40 is respectively KA to KL
  • the drive switch 50 is respectively K1 to K24
  • the backlight module 60 is 12 horizontal rows (B1...B12), 24 vertical.
  • the matrix form of the columns (A1...A24) is explained as an example.
  • the backlight module 60 includes a plurality of LED lamps arranged in a matrix and drives the LED lamps by matrix control. Specifically, each row, that is, each horizontal row of LED lamps, is powered by a power supply selection switch 40, and each column, that is, each column of LED lamps, is controlled by a drive switch 50.
  • the control module 30 divides a frame signal into subfields of the same number as the horizontal row according to the number of horizontal rows.
  • the control module 30 controls the first power supply selection switch KA to be turned on, so that all the first horizontal rows of LED lights are turned on (lighted).
  • the LED drive control module 30 adjusts the brightness of the LED light connected to the first horizontal row when receiving the first subfield signal, that is, the brightness signal of the LED light, and so on, until all the horizontal rows of LED lights Light up once and repeat the above process.
  • the number of LED lights in the backlight module 60 is not limited.
  • the number of LED lamps exemplified in the above embodiments is merely used to more easily clarify the inventive concept.
  • the invention also provides an electronic device comprising a LOCAL DIMMING backlight driving circuit, the LOCAL
  • the specific structure of the DIMMING backlight driving circuit refers to the above embodiment. Since the electronic device adopts all the technical solutions of all the above embodiments, at least all the beneficial effects brought by the technical solutions of the foregoing embodiments are not used herein. Narration.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Liquid Crystal (AREA)
  • Planar Illumination Modules (AREA)

Abstract

L'invention concerne un circuit d'attaque de rétro-éclairage à gradation locale et un dispositif électronique, le circuit d'attaque de rétro-éclairage à gradation locale comportant: un collecteur de courant (A); une source (10) d'alimentation d'attaque; un module (60) de rétro-éclairage, le module (60) de rétro-éclairage comportant de multiples lampes à DEL agencées en une matrice; de multiples commutateurs sélecteurs (40) d'alimentation électrique, les bornes d'entrée des multiples commutateurs sélecteurs (40) d'alimentation électrique étant reliées à la source (10) d'alimentation d'attaque; les bornes de sortie des multiples commutateurs sélecteurs (40) d'alimentation électrique étant reliées à des anodes des lampes à DEL dans une correspondance biunivoque; de multiples commutateurs (50) d'attaque, une borne d'entrée de chaque commutateur (50) d'attaque étant reliée aux cathodes d'au moins deux lampes à DEL, et une borne de sortie de chaque commutateur (50) d'attaque étant mise à la terre via le collecteur de courant (A); et un module (30) de commande, utilisé pour commander chaque commutateur (50) d'attaque, de façon à mettre en œuvre une gradation d'un module (20) d'attaque de DEL, commander l'exploitation du module (20) de commande d'attaque de DEL et commander la fermeture et l'ouverture des multiples commutateurs sélecteurs (40) d'alimentation électrique. Le présent circuit d'attaque de rétro-éclairage à gradation locale réduit un nombre de CI d'attaque, abaissant les coûts de production.
PCT/CN2017/111895 2016-12-31 2017-11-20 Circuit d'attaque de rétro-éclairage à gradation locale et dispositif électronique Ceased WO2018121126A1 (fr)

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CN201611271146.5 2016-12-31
CN201611271146.5A CN106683622B (zh) 2016-12-31 2016-12-31 Local dimming背光驱动电路及电子设备

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CN106683622B (zh) * 2016-12-31 2019-12-03 深圳Tcl数字技术有限公司 Local dimming背光驱动电路及电子设备
CN108597458B (zh) * 2018-04-26 2020-12-08 深圳Tcl新技术有限公司 Local dimming背光驱动电路、装置及液晶显示设备
US11769987B2 (en) * 2018-08-21 2023-09-26 Semiconductor Components Industries, Llc Methods and systems of driving arrays of diodes
CN109192146A (zh) 2018-10-12 2019-01-11 京东方科技集团股份有限公司 一种背光模组及显示装置
CN110021276B (zh) * 2019-05-10 2024-03-29 重庆惠科金扬科技有限公司 一种背光驱动电路及背光驱动装置
CN111627381A (zh) * 2020-06-30 2020-09-04 上海天马微电子有限公司 发光面板及显示装置
CN120847819A (zh) * 2020-08-24 2025-10-28 上海禾赛科技有限公司 发射装置、包括其的激光雷达及控制方法
CN113689782A (zh) * 2021-08-19 2021-11-23 武汉华星光电技术有限公司 背光模组及显示装置
CN115985258A (zh) * 2023-01-06 2023-04-18 冠捷显示科技（厦门）有限公司 液晶电视的矩阵式Mini LED背光控制电路及方法

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