WO2017020330A1 - 一种背光源 - Google Patents

一种背光源 Download PDF

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Publication number
WO2017020330A1
WO2017020330A1 PCT/CN2015/086486 CN2015086486W WO2017020330A1 WO 2017020330 A1 WO2017020330 A1 WO 2017020330A1 CN 2015086486 W CN2015086486 W CN 2015086486W WO 2017020330 A1 WO2017020330 A1 WO 2017020330A1
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WIPO (PCT)
Prior art keywords
level
voltage
led
control signal
output unit
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/CN2015/086486
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English (en)
French (fr)
Inventor
徐向阳
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TCL China Star Optoelectronics Technology Co Ltd
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Shenzhen China Star Optoelectronics Technology Co Ltd
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Publication of WO2017020330A1 publication Critical patent/WO2017020330A1/zh
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Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133603—Direct backlight with LEDs
    • 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
    • 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
    • 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
    • G09G3/3413—Details of control of colour illumination sources
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133621—Illuminating devices providing coloured light
    • G02F1/133622—Colour sequential illumination

Definitions

  • the present invention relates to the field of liquid crystal display technologies, and in particular, to a backlight.
  • Liquid crystal display is a passive light-emitting technology. Light is emitted from the backlight through the lower polarizing plate, pixel area, liquid crystal layer, color film, upper polarizing plate, etc., and the light that can enter the human eye is less than 7%. Among them, the most light-loss substrate is a color film substrate, and about 70% of the light cannot pass. Such a low transmittance results in a high backlight brightness requirement, and backlight power consumption cannot be effectively reduced.
  • the prior art has developed a colorless film field sequential liquid crystal display.
  • the principle is to use a time division multiplexing system using RGB light sources while maintaining the number of pixels unchanged.
  • the red, green, and blue light are sequentially emitted while controlling the thin film transistor (TFT) of each pixel, the liquid crystal light valve is turned on correspondingly according to the intensity that the pixel should have in such a color.
  • TFT thin film transistor
  • the liquid crystal light valve is turned on correspondingly according to the intensity that the pixel should have in such a color.
  • the repetition period of the three colors is less than the visual residual time of the human eye, a colored image can be formed in the human brain.
  • the visual residual time is actually the field frequency period of the TV, which is one-sixtieth of a second. This also requires the display of three images of red, green and blue in one-sixth of a second. Therefore, this method is called the "field order" system, and some people call it the "color order” system.
  • the color filter in the color film substrate can be removed, the number of light passing can be increased, and the illuminance can be increased; and the number of LEDs in the backlight can be reduced under the premise of improving the illuminance, and further It can reduce the heat of the liquid crystal display and reduce the power consumption of the liquid crystal display.
  • three sets of driving circuits are used for three sets of RGB in a colorless film field sequential liquid crystal display.
  • the LED driver uses the first group of driving circuits to drive the red LED group, and the second group driving circuit drives the green LED group; therefore, the driving circuit is complicated and the cost is relatively high.
  • the object of the present invention is to provide a backlight to solve the existing RGB in a colorless film field sequential liquid crystal display.
  • LED drivers have technical problems that are complicated and costly.
  • the present invention provides the following technical solutions:
  • Embodiments of the present invention provide a backlight for a field sequential liquid crystal display, the backlight comprising:
  • the LED light group includes: an LED substrate; and a red LED, a green LED, and a blue LED disposed on the LED substrate;
  • a heat dissipation plate for dissipating heat to the LED group, the LED lamp group being disposed on the heat dissipation plate;
  • the driving circuit is disposed on the circuit substrate, the driving circuit is configured to acquire a control signal, and drive the red LED, the green LED, and the blue LED to be predetermined according to the control signal Sequentially emitting light within a period, the predetermined period being less than or equal to a visual residual time of the human eye;
  • the control signal includes: a first control signal and a second control signal
  • the first control signal is a periodic control signal, and a first low level, a high level, and the second low level are sequentially generated in one cycle;
  • the second control signal is a periodic control signal, and a first level corresponding to the first low level, a second level corresponding to the high level, and the a third level corresponding to the second low level; a period of the second control signal being the same as the predetermined period;
  • the driving circuit is specifically configured to:
  • the level of the second control signal is the first level, and the level of the first control signal is the first low level, only the red LED is driven to emit light;
  • the level of the second control signal is the third level, and the level of the first control signal is the second low level, only the blue LED is driven to emit light.
  • the backlight further includes: a first voltage output unit for outputting the first preset voltage, and a second voltage output unit for outputting the second preset voltage for outputting the third a third voltage output unit of a preset voltage;
  • the driving circuit includes: a first signal output unit for outputting the first control signal, a second signal output unit for outputting the second control signal, and a switch tube; the switch tube has a control end and an input End and output;
  • the first signal output unit is connected to a control end of the switch tube, and an output end of the switch tube is connected to an anode of the green LED;
  • the second signal output unit is respectively connected to a negative pole of the red LED, an input end of the switch tube, and an anode of the blue LED;
  • the anode of the red LED is connected to the first voltage output unit
  • the cathode of the green LED is connected to the second voltage output unit
  • the cathode of the blue LED is connected to the third voltage output unit.
  • the voltage difference between the first predetermined voltage and the first level is greater than or equal to the turn-on voltage of the red LED, the first level and the third preset The voltage difference of the voltage is less than the turn-on voltage of the blue LED;
  • the voltage difference between the first preset voltage and the second level is less than the turn-on voltage of the red LED, and the voltage difference between the second level and the second preset voltage is greater than or equal to the turn-on voltage of the green LED
  • the voltage difference between the second level and the third preset voltage is less than the turn-on voltage of the blue LED
  • the voltage difference between the first preset voltage and the third level is less than the turn-on voltage of the red LED, and the voltage difference between the third level and the third preset voltage is greater than or equal to the turn-on voltage of the blue LED .
  • the third level is greater than the second level, and the second level is greater than the first level.
  • the first preset voltage is equal to the third preset voltage
  • the second preset voltage is smaller than the first preset voltage
  • the first level is 0, the second level is Von, the third level is 2Von, the first preset voltage is Von, and the second The preset voltage is 0, and the third preset voltage is Von, and Von is a red LED string, a green LED string, and an on voltage of the blue LED string.
  • the backlight further includes: a first voltage output unit for outputting the first preset voltage, and a second preset voltage output second output unit for outputting the third pre- a third voltage output unit that sets a voltage;
  • the driving circuit includes: a first signal output unit for generating the first control signal, a second signal output unit for generating the second control signal, and a switch tube; the switch tube has a control end, an input End and output;
  • the first signal output unit is connected to a control end of the switch tube, and an output end of the switch tube is connected to an anode of the green LED;
  • the second signal output unit is respectively connected to a positive pole of the red LED, an input end of the switch tube, and a negative pole of the blue LED;
  • the cathode of the red LED is connected to the first voltage output unit
  • the cathode of the green LED is connected to the second voltage output unit
  • the anode of the blue LED is connected to the third voltage output unit.
  • the duration of the first level, the duration of the second level, and the duration of the second level are equal in a period of one of the second control signals
  • the duration of the first level is one third of the period of the second control signal.
  • the first low level is the same as the second low level.
  • Embodiments of the present invention provide a backlight for a field sequential liquid crystal display, the backlight comprising:
  • An LED lamp set comprising: an LED substrate and a red LED, a green LED, and a blue LED disposed on the LED substrate;
  • the driving circuit is disposed on the circuit substrate, the driving circuit is configured to acquire a control signal, and drive the red LED, the green LED, and the blue LED to be predetermined according to the control signal
  • the sequence is illuminated in a period that is less than or equal to the visual residual time of the human eye.
  • control signal includes: a first control signal and a second control signal
  • the first control signal is a periodic control signal, and a first low level, a high level, and the second low level are sequentially generated in one cycle;
  • the second control signal is a periodic control signal, and a first level corresponding to the first low level, a second level corresponding to the high level, and the a third level corresponding to the second low level; a period of the second control signal being the same as the predetermined period;
  • the driving circuit is used for driving the driving circuit.
  • the level of the second control signal is the first level, and the level of the first control signal is the first low level, only the red LED is driven to emit light;
  • the level of the second control signal is the third level, and the level of the first control signal is the second low level, only the blue LED is driven to emit light.
  • the backlight further includes: a first voltage output unit for outputting the first preset voltage, and a second voltage output unit for outputting the second preset voltage for outputting the third a third voltage output unit of a preset voltage;
  • the driving circuit includes: a first signal output unit for outputting the first control signal, a second signal output unit for outputting the second control signal, and a switch tube; the switch tube has a control end and an input End and output;
  • the first signal output unit is connected to a control end of the switch tube, and an output end of the switch tube is connected to an anode of the green LED;
  • the second signal output unit is respectively connected to a negative pole of the red LED, an input end of the switch tube, and an anode of the blue LED;
  • the anode of the red LED is connected to the first voltage output unit
  • the cathode of the green LED is connected to the second voltage output unit
  • the cathode of the blue LED is connected to the third voltage output unit.
  • the voltage difference between the first predetermined voltage and the first level is greater than or equal to the turn-on voltage of the red LED, the first level and the third preset The voltage difference of the voltage is less than the turn-on voltage of the blue LED;
  • the voltage difference between the first preset voltage and the second level is less than the turn-on voltage of the red LED, and the voltage difference between the second level and the second preset voltage is greater than or equal to the turn-on voltage of the green LED
  • the voltage difference between the second level and the third preset voltage is less than the turn-on voltage of the blue LED
  • the voltage difference between the first preset voltage and the third level is less than the turn-on voltage of the red LED, and the voltage difference between the third level and the third preset voltage is greater than or equal to the turn-on voltage of the blue LED .
  • the third level is greater than the second level, and the second level is greater than the first level.
  • the first preset voltage is equal to the third preset voltage
  • the second preset voltage is smaller than the first preset voltage
  • the first level is 0, the second level is Von, the third level is 2Von, the first preset voltage is Von, and the second pre- Let the voltage be 0, the third preset voltage is Von, and Von is the turn-on voltage of the red LED string, the green LED string and the blue LED string.
  • the backlight further includes: a first voltage output unit for outputting the first preset voltage, and a second preset voltage output second output unit for outputting the third pre- a third voltage output unit that sets a voltage;
  • the driving circuit includes: a first signal output unit for generating the first control signal, a second signal output unit for generating the second control signal, and a switch tube; the switch tube has a control end, an input End and output;
  • the first signal output unit is connected to a control end of the switch tube, and an output end of the switch tube is connected to an anode of the green LED;
  • the second signal output unit is respectively connected to a positive pole of the red LED, an input end of the switch tube, and a negative pole of the blue LED;
  • the cathode of the red LED is connected to the first voltage output unit
  • the cathode of the green LED is connected to the second voltage output unit
  • the anode of the blue LED is connected to the third voltage output unit.
  • the duration of the first level, the duration of the second level, and the duration of the second level are equal in a period of one of the second control signals
  • the duration of the first level is one third of the period of the second control signal.
  • the backlight further includes a heat dissipation plate for dissipating heat from the LED group, and the LED light group is disposed on the heat dissipation plate.
  • the period of the first control signal is equal to the period of the second control signal.
  • the invention provides a backlight source, which can be applied to a field sequential liquid crystal display, comprising: a circuit substrate; an LED lamp group, the LED lamp group comprising: an LED substrate and a red LED disposed on the LED substrate, green light LED and blue LED; heat sink, and driving circuit, the driving circuit is disposed on the circuit substrate, the driving circuit is configured to acquire a control signal, and drive the red LED, the green according to the control signal
  • the light LED and the blue LED sequentially emit light in a predetermined period, the predetermined period is less than or equal to the visual residual time of the human eye
  • the backlight of the present invention may use a driving circuit to drive the LED light group to make the LED light group
  • the red light, the green light and the blue light are sequentially emitted in a predetermined period
  • the driving method of the backlight of the invention simplifies the driving circuit of the colorless film field sequential liquid crystal display backlight compared with the prior art, and reduces the backlight driving circuit. The difficulty of making, which reduces costs.
  • FIG. 1 is a schematic structural diagram of a first backlight according to an embodiment of the present invention.
  • FIG. 2 is a schematic structural diagram of a second backlight according to an embodiment of the present invention.
  • FIG. 3 is a timing diagram of backlight driving according to an embodiment of the present invention.
  • FIG. 4 is a schematic structural diagram of a third backlight according to an embodiment of the present invention.
  • FIG. 5 is a timing diagram of another backlight driving according to an embodiment of the present invention.
  • the embodiment provides a backlight for a field sequential liquid crystal display, which includes:
  • the circuit substrate 10 preferably may be a PCB board
  • the LED light group includes: an LED substrate and a red LED disposed on the LED substrate (not shown) 201, green LED 202 and blue LED 203;
  • a heat dissipation plate 30 for dissipating heat to the LED group 20, the LED light group 20 being disposed on the heat dissipation plate 30;
  • the driving circuit 40 is disposed on the circuit substrate 10, the driving circuit 40 is configured to acquire a control signal, and drive the red LED according to the control signal 201.
  • the green LED 202 and the blue LED 203 sequentially emit light in a predetermined period, the predetermined period being less than or equal to a visual residual time of a human eye.
  • the LED lamp group 20 can be an LED light bar.
  • three LED sub-groups are provided, which are respectively composed of a plurality of red LEDs.
  • 201 a red LED subgroup composed in series
  • a plurality of blue LEDs 203 is a blue LED subgroup composed in series, as shown in FIG. 1 , in this embodiment, a red LED 201 and a green LED are used.
  • the number of 202 and blue LEDs 203 are equal and are 4 as an example to introduce the backlight; however, in other embodiments, the red LED 201, the green LED 202, and the blue LED The number of 203 can be different.
  • the LED group 20 in this embodiment may include only three red LEDs 201 and green LEDs. 202 and blue LED 203.
  • the human visual residual time is actually the field frequency period of the liquid crystal television, that is, one-sixth of a second.
  • the sequential illumination in a predetermined period in this embodiment refers to: firstly, a red LED in a preset period. 201, green light 202 and blue light LED 203 do not emit light, then green light LED 202 emits light, red light 201 and blue light LED 203 do not emit light, and finally blue light LED 203 emits light, red light LED 201 and green LED 203 do not emit light.
  • the backlight shown in Figure 1 uses a driver circuit to drive RGB
  • the LED lamp group sequentially emits light in the visual residual time of the human eye; compared with the prior art, the driving circuit can be simplified, the manufacturing difficulty is reduced, and the cost of the backlight driving is reduced.
  • control signal in this embodiment may include: a first control signal Con and a second control signal Drv; the first control signal Con is a periodic control signal, and the first low occurs sequentially in one cycle.
  • the second control signal Drv is a periodic control signal, and a first level Drv1, a second level Drv2, and a third level Drv3 are sequentially generated in one cycle; a period of the second control signal is Scheduled period
  • the first level Drv1 corresponds to a first low level of Con
  • the second level Drv2 corresponds to a high level of Con
  • the third level Drv3 corresponds to a second low level of Con;
  • Correspondence refers to: In a cycle, when Drv1 appears, the first low level of Con also appears. Similarly, when Drv2 appears, the high and low levels of Con also appear. When Drv3 appears, the second low power of Con Ping also appeared.
  • the driving circuit 40 is used for driving the driving circuit 40.
  • the different levels of the second control signal Drv in this embodiment correspond to different color LEDs, wherein the magnitude relationship between the first level, the second level, and the third level, and the specific values of the three levels It can be set according to actual needs or actual application scenarios.
  • the backlight further includes: a first voltage output unit 501 for outputting a first preset voltage V1, for outputting a second preset voltage. a second voltage output unit 502 of V2, for outputting a third voltage output unit 503 of the third preset voltage V3;
  • the driving circuit includes: a first signal output unit 401 for outputting the first control signal Con, a second signal output unit 402 for outputting the second control signal Drv, and a switch tube 403;
  • the switch tube 403 has a control terminal 4031, an input terminal 4032, and an output terminal 4033;
  • the first signal output unit may generate the first control signal Con according to the pulse signal; specifically, the period of the first control signal Con may be twice the pulse signal CLK, and the high and low levels are both high and low with the CLK. Flat same;
  • the first signal output unit 401 can also be an input terminal, receiving the first input control signal Con;
  • the first signal output unit 401 is connected to the control end 4031 of the switch tube 403, and the output end 4033 of the switch tube 403 is connected to the positive pole of the green LED 202;
  • the second signal output unit 402 is respectively connected to the negative pole of the red LED 201, the input end 4032 of the switch tube 403, and the anode of the blue LED 203;
  • the anode of the red LED 201 is connected to the first voltage output unit 501, the cathode of the green LED 202 is connected to the second voltage output unit 502, and the cathode of the blue LED 203 is connected to the third voltage output unit 503.
  • the voltage difference between V1 and Drv1 is greater than or equal to the turn-on voltage Von1 of the red LED, and the voltage difference between V1 and Drv1 is smaller than the turn-on voltage Von3 of the blue LED.
  • the voltage difference between V1 and Drv2 is less than Von1, the voltage difference between Drv2 and V2 is greater than or equal to the turn-on voltage Von2 of the green LED, and the voltage difference between Drv2 and V3 is less than Von3;
  • the voltage difference between V1 and Drv3 is less than Von1, and the voltage difference between Drv3 and V3 is greater than or equal to Von3.
  • the driving circuit shown in FIG. 2 can realize that the red LED, the green LED and the blue LED are sequentially illuminated in a predetermined period, and the specific implementation process can be;
  • the turn-on voltages of the red LED subgroup, the green LED subgroup, and the blue LED subgroup are all Von.
  • Drv1, Drv2, Drv3 appear sequentially, and Drv1 ⁇ Drv2 ⁇ Drv3; Drv1, Drv2, Drv3 last for the same period of one Drv, and equal to one-third of the period of Drv; the same Con Also the high and low levels last for the same time and equal to one third of the Drv period;
  • Drv1, Drv2, and Drv3 may not be equal in this embodiment, as long as the level change corresponds to the change of the Con level.
  • the switch 403 When the level of Drv is the first level Drv1 and the level of Con is low, the switch 403 is turned off, and the voltage across the red LED subgroup is V1- Drv1 ⁇ Von, at this time driving the red LED sub-group to emit light; and for the green LED sub-group, since the switch tube 403 is off, the green LED sub-group does not emit light, for the blue LED sub-group, due to the blue LED sub-group at both ends The voltage is Drv1-V3 ⁇ Von, so the blue LED sub-group does not emit light;
  • the level of Drv is the second level Drv2
  • the level of Con is high level
  • the switch tube 403 is turned on, and the voltage across the red LED subgroup is V1- Drv2 ⁇ Von, the red LED subgroup does not emit light
  • the switch tube 403 since the switch tube 403 is turned on, the voltage across the green LED subgroup is Drv2-V2 ⁇ Von, and the green LED subgroup is driven to emit light
  • the blue LED subgroup has a voltage of Drv2-V3 ⁇ Von at both ends, so it does not emit light;
  • the switch tube 403 When the level of Drv is the second level Drv3, the level of Con is low, the switch tube 403 is turned off, and the voltage across the red LED subgroup is V1- Drv3 ⁇ Von, the red LED subgroup does not emit light; for the green LED subgroup, since the switch tube 403 is turned off, the green LED subgroup does not emit light; for the blue LED subgroup, the voltage across the two ends is Drv3-V3 ⁇ Von, Therefore, the green LED sub-group emits light;
  • the driving circuit of the embodiment can realize sequential illumination of the red LED subgroup, the green LED subgroup and the blue LED subgroup in one Drv cycle.
  • the switch 403 can be a field effect transistor, wherein the control terminal 4031 is the gate of the field effect transistor, the input terminal 4032 is the source of the field effect transistor, and the output terminal 4033 is the drain of the field effect transistor.
  • the above is mainly the reverse connection of the red LED subgroup and the forward connection of the blue LED subgroup, that is, the backlight of the embodiment is introduced by taking the negative terminal of the red LED 201 connected to Drv, the positive electrode is connected to V1, the positive end of the blue LED 203 is connected to Drv, and the negative electrode is connected to V3.
  • the backlight of the embodiment is introduced by taking the negative terminal of the red LED 201 connected to Drv, the positive electrode is connected to V1, the positive end of the blue LED 203 is connected to Drv, and the negative electrode is connected to V3.
  • the red LED sub-group can be connected in a forward direction, and the blue LED sub-group is connected in reverse.
  • the red LED 201 is connected to the Drv and the negative terminal to the V1, and the blue LED is connected to the RV.
  • the positive pole is connected to V3; at this time, changing the size of Drv1, Drv2, Drv3, V1, V2, and V3 can realize sequential illumination of the red LED subgroup, the green LED subgroup, and the blue LED subgroup in a predetermined period;
  • the first signal output unit 401 is connected to the control end 4031 of the switch tube 403, and the output end 4033 of the switch tube 403 is connected to the anode of the green LED 202.
  • the second signal output unit 402 is respectively connected to the anode of the red LED 201, the input end 4032 of the switch tube 403, and the cathode of the blue LED 203;
  • the cathode of the red LED 201 is connected to the first voltage output unit 501
  • the cathode of the green LED 202 is connected to the second voltage output unit 502
  • the anode of the blue LED 203 is connected to the third voltage output unit 503. 4
  • the driving process of the driving circuit 40 in the backlight shown in FIG. 4 is as follows:

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Abstract

一种背光源，应用于场序列液晶显示器，其包括：驱动电路（40），用于根据控制信号驱动红光LED（201）、绿光LED（202）和蓝光LED（203）在预定周期内顺序发光，预定周期小于或等于人眼的视觉残留时间；应用上述背光源可以简化无彩膜场序列液晶显示中背光源的驱动电路，降低背光源驱动电路的制作难度，从而降低了成本。

Description

一种背光源 技术领域
本发明涉及液晶显示器技术领域，特别是涉及一种背光源。
 背景技术
液晶显示是一种被动发光的技术，光线由背光源发出经过下偏光板，像素区，液晶层，彩膜，上偏光板等，最终能够进入人眼的光线不足7%。其中损耗光线最多的为彩膜基板，大约有70%的光线无法通过。如此低的透过率导致背光亮度需要很高，背光功耗无法有效降低。
为了降低背光功耗，需要省去彩膜基板中的彩膜滤光片，现有技术开发了无彩膜场序列液晶显示。其原理是在维持像素个数不变的情况下，使用RGB光源采用时分复用制。这样只要顺序地发射出红光、绿光、蓝光，同时控制每个像素的薄膜晶体管(TFT)，使其相应地按照该像素在这种颜色时所应当具有的的强度来开启液晶光阀。但是，要顺序地发出红、绿、蓝三种颜色，并能形成一个彩色的视频图象，就必须利用人眼的视觉残留作用。只要这三种颜色顺序重复的周期小于人眼的视觉残留时间，就可以在人们的大脑中形成一个彩色的图象。视觉残留时间实际上就是电视的场频周期，即六十分之一秒。这也就要求在六十分之一秒的时间内必须完成红、绿、蓝三个图象的显示。因此，这种方式被称为“场顺序”体制，也有人称之为“色顺序”体制。
采用场顺序制以后，就可以拿掉了彩膜基板中的彩色滤光片，增加光线通过的数量，提高发光率；在发光率提高的前提下，还可以减少背光源中LED的数量，进而可以减少液晶显示器的热量，降低液晶显示器的功耗。
目前，无彩膜场序列液晶显示器中采用三组驱动电路分别对三组RGB LED驱动，即采用第一组驱动电路对红光LED组进行驱动，采用第二组驱动电路对绿光LED组进行驱动；因此，驱动线路较为复杂，成本也比较高。
因此，有必要提供一种背光源，以解决现有技术所存在的问题。
 技术问题
本发明的目的在于提供一种背光源，以解决现有无彩膜场序列液晶显示器中RGB LED驱动存在线路复杂、成本较高的技术问题。
 技术解决方案
为解决上述技术问题，本发明提供了如下技术方案：
本发明的实施例提供了一种背光源，应用于场序列液晶显示器，所述背光源包括：
电路基板；
LED灯组，所述LED灯组包括：LED基板和设置在所述LED基板上的红光LED、绿光LED和蓝光LED；
散热板，所述散热板用于对所述LED组散热，所述LED灯组设置在所述散热板上；以及
驱动电路，所述驱动电路设置在所述电路基板上，所述驱动电路用于获取控制信号，并根据所述控制信号驱动所述红光LED、所述绿光LED和所述蓝光LED在预定周期内顺序发光，所述预定周期小于或等于人眼的视觉残留时间；
其中，所述控制信号包括：第一控制信号和第二控制信号；
所述第一控制信号为周期性的控制信号，且在一个周期内顺序出现第一低电平、高电平和所述第二低电平；
所述第二控制信号为周期性的控制信号，且在一个周期内顺序出现与所述第一低电平对应的第一电平、与所述高电平对应的第二电平和与所述第二低电平对应的第三电平；所述第二控制信号的周期与所述预定周期相同；
所述驱动电路，具体用于：
在所述第二控制信号的电平为第一电平，且所述第一控制信号的电平为第一低电平时，仅驱动所述红光LED发光；
在所述第二控制信号的电平为第二电平，且第一控制信号的电平为高电平时，仅驱动所述绿光LED发光；
在所述第二控制信号的电平为第三电平，且第一控制信号的电平为第二低电平时，仅驱动所述蓝光LED发光。
在本发明的背光源中，所述背光源还包括：用于输出第一预设电压的第一电压输出单元，用于输出第二预设电压的第二电压输出单元，用于输出第三预设电压的第三电压输出单元；
所述驱动电路包括：用于输出所述第一控制信号的第一信号输出单元、用于输出所述第二控制信号的第二信号输出单元和开关管；所述开关管具有控制端、输入端和输出端；
所述第一信号输出单元与所述开关管的控制端连接，所述开关管的输出端与所述绿光LED的正极连接；
所述第二信号输出单元分别与所述红光LED的负极、所述开关管的输入端、所述蓝光LED的正极连接；
所述红光LED的正极与所述第一电压输出单元连接，所述绿光LED的负极与第二电压输出单元连接，所述蓝光LED的负极与第三电压输出单元连接。
在本发明的背光源中，所述第一预设电压与所述第一电平的电压差大于或等于所述红光LED的开启电压，所述第一电平与所述第三预设电压的电压差小于蓝光LED的开启电压；
所述第一预设电压与所述第二电平的电压差小于红光LED的开启电压，所述第二电平与所述第二预设电压的电压差大于等于绿光LED的开启电压，所述第二电平与所述第三预设电压的电压差小于蓝光LED的开启电压；
所述第一预设电压与所述第三电平的电压差小于红光LED的开启电压，所述第三电平与所述第三预设电压的电压差大于或等于蓝光LED的开启电压。
在本发明的背光源中，所述第三电平大于所述第二电平，所述第二电平大于所述第一电平。
在本发明的背光源中，所述第一预设电压与所述第三预设电压相等，所述第二预设电压小于所述第一预设电压。
在本发明的额背光源中，所述第一电平为0，所述第二电平为Von，所述第三电平为2Von，所述第一预设电压为Von，所述第二预设电压为0，所述第三预设电压为Von，Von为红光LED串、绿光LED串和所述蓝光LED串的开启电压。
在本发明的背光源中，所述背光源还包括：用于输出第一预设电压的第一电压输出单元，用于输出第二预设电压第二电压输出单元，用于输出第三预设电压的第三电压输出单元；
所述驱动电路包括：用于生成所述第一控制信号的第一信号输出单元、用于生成所述第二控制信号的第二信号输出单元和开关管；所述开关管具有控制端、输入端和输出端；
所述第一信号输出单元与所述开关管的控制端连接，所述开关管的输出端与所述绿光LED的正极连接；
所述第二信号输出单元分别与所述红光LED的正极、所述开关管的输入端、所述蓝光LED的负极连接；
所述红光LED的负极与所述第一电压输出单元连接，所述绿光LED的负极与第二电压输出单元连接，所述蓝光LED的正极与第三电压输出单元连接。
在本发明的背光源中，在一个所述第二控制信号的周期内，所述第一电平的持续时间、所述第二电平的持续时间，所述第二电平的持续时间相等，所述第一电平的持续时间为所述第二控制信号周期的三分之一。
在本发明的背光源中，所述第一低电平与所述第二低电平相同。
本发明的实施例提供了一种背光源，应用于场序列液晶显示器，所述背光源包括：
LED灯组，所述LED灯组包括：LED基板和设置在所述LED基板上的红光LED、绿光LED和蓝光LED；以及
驱动电路，所述驱动电路设置在所述电路基板上，所述驱动电路用于获取控制信号，并根据所述控制信号驱动所述红光LED、所述绿光LED和所述蓝光LED在预定周期内顺序发光，所述预定周期小于或等于人眼的视觉残留时间。
在本发明的背光源中，所述控制信号包括：第一控制信号和第二控制信号；
所述第一控制信号为周期性的控制信号，且在一个周期内顺序出现第一低电平、高电平和所述第二低电平；
所述第二控制信号为周期性的控制信号，且在一个周期内顺序出现与所述第一低电平对应的第一电平、与所述高电平对应的第二电平和与所述第二低电平对应的第三电平；所述第二控制信号的周期与所述预定周期相同；
所述驱动电路，用于
在所述第二控制信号的电平为第一电平，且所述第一控制信号的电平为第一低电平时，仅驱动所述红光LED发光；
在所述第二控制信号的电平为第二电平，且第一控制信号的电平为高电平时，仅驱动所述绿光LED发光；
在所述第二控制信号的电平为第三电平，且第一控制信号的电平为第二低电平时，仅驱动所述蓝光LED发光。
在本发明的背光源中，所述背光源还包括：用于输出第一预设电压的第一电压输出单元，用于输出第二预设电压的第二电压输出单元，用于输出第三预设电压的第三电压输出单元；
所述驱动电路包括：用于输出所述第一控制信号的第一信号输出单元、用于输出所述第二控制信号的第二信号输出单元和开关管；所述开关管具有控制端、输入端和输出端；
所述第一信号输出单元与所述开关管的控制端连接，所述开关管的输出端与所述绿光LED的正极连接；
所述第二信号输出单元分别与所述红光LED的负极、所述开关管的输入端、所述蓝光LED的正极连接；
所述红光LED的正极与所述第一电压输出单元连接，所述绿光LED的负极与第二电压输出单元连接，所述蓝光LED的负极与第三电压输出单元连接。
在本发明的背光源中，所述第一预设电压与所述第一电平的电压差大于或等于所述红光LED的开启电压，所述第一电平与所述第三预设电压的电压差小于蓝光LED的开启电压；
所述第一预设电压与所述第二电平的电压差小于红光LED的开启电压，所述第二电平与所述第二预设电压的电压差大于等于绿光LED的开启电压，所述第二电平与所述第三预设电压的电压差小于蓝光LED的开启电压；
所述第一预设电压与所述第三电平的电压差小于红光LED的开启电压，所述第三电平与所述第三预设电压的电压差大于或等于蓝光LED的开启电压。
在本发明的背光源中，所述第三电平大于所述第二电平，所述第二电平大于所述第一电平。
在本发明的背光源中，所述第一预设电压与所述第三预设电压相等，所述第二预设电压小于所述第一预设电压。
在本发明的背光源中，所述第一电平为0，所述第二电平为Von，所述第三电平为2Von，所述第一预设电压为Von，所述第二预设电压为0，所述第三预设电压为Von，Von为红光LED串、绿光LED串和所述蓝光LED串的开启电压。
在本发明的背光源中，所述背光源还包括：用于输出第一预设电压的第一电压输出单元，用于输出第二预设电压第二电压输出单元，用于输出第三预设电压的第三电压输出单元；
所述驱动电路包括：用于生成所述第一控制信号的第一信号输出单元、用于生成所述第二控制信号的第二信号输出单元和开关管；所述开关管具有控制端、输入端和输出端；
所述第一信号输出单元与所述开关管的控制端连接，所述开关管的输出端与所述绿光LED的正极连接；
所述第二信号输出单元分别与所述红光LED的正极、所述开关管的输入端、所述蓝光LED的负极连接；
所述红光LED的负极与所述第一电压输出单元连接，所述绿光LED的负极与第二电压输出单元连接，所述蓝光LED的正极与第三电压输出单元连接。
在本发明的背光源中，在一个所述第二控制信号的周期内，所述第一电平的持续时间、所述第二电平的持续时间，所述第二电平的持续时间相等，所述第一电平的持续时间为所述第二控制信号周期的三分之一。
在本发明的背光源中，所述背光源还包括用于对所述LED组散热的散热板，所述LED灯组设置在所述散热板上。
在本发明的背光源中，所述第一控制信号的周期与所述第二控制信的周期相等。
 有益效果
本发明提供了一种背光源，可以应用于场序列液晶显示器，包括：电路基板；LED灯组，所述LED灯组包括：LED基板和设置在所述LED基板上的红光LED、绿光LED和蓝光LED；散热板，以及驱动电路，所述驱动电路设置在所述电路基板上，所述驱动电路用于获取控制信号，并根据所述控制信号驱动所述红光LED、所述绿光LED和所述蓝光LED在预定周期内顺序发光，所述预定周期小于或等于人眼的视觉残留时间；本发明的背光源可以采用一个驱动电路来驱动LED灯组，使所述LED灯组在一个预定周期内依次发出红光、绿光、蓝光；本发明背光源的驱动方式与现有技术相比，简化了无彩膜场序列液晶显示背光源的驱动电路，降低了背光源驱动电路的制作难度，从而降低了成本。
 附图说明
图1为本发明实施例提供的第一种背光源的结构示意图；
图2为本发明实施例提供的第二种背光源的结构示意图；
图3为本发明实施例提供的一种背光驱动时序图；
图4为本发明实施例提供的第三种背光源的结构示意图；
图5为本发明实施例提供的另一种背光驱动时序图。
 本发明的最佳实施方式
以下各实施例的说明是参考附加的图式，用以例示本发明可用以实施的特定实施例。本发明所提到的方向用语，例如「上」、「下」、「前」、「后」、「左」、「右」、「内」、「外」、「侧面」等，仅是参考附加图式的方向。因此，使用的方向用语是用以说明及理解本发明，而非用以限制本发明。在图中，结构相似的单元是以相同标号表示。
考虑到现有无彩膜场序列液晶显示器中RGB LED驱动存在线路复杂、成本较高的技术问题；如图1所示，本实施例提供了一种背光源，应用于场序列液晶显示器，其包括：
电路基板10，优选地可以为PCB板；
LED灯组20，所述LED灯组包括：LED基板和设置在所述LED基板（未示意出）上的红光LED 201、绿光LED 202和蓝光LED 203；
散热板30，所述散热板用于对所述LED组20散热，所述LED灯组20设置在所述散热板30上；以及
驱动电路40，所述驱动电路40设置在所述电路基板10上，所述驱动电路40用于获取控制信号，并根据所述控制信号驱动所述红光LED 201、所述绿光LED 202和所述蓝光LED 203在预定周期内顺序发光，所述预定周期小于或等于人眼的视觉残留时间。
LED灯组20可以为一个LED灯条，在LED灯条基板上，设置三个LED子组，分别为由多个红光LED 201串联组成的红光LED子组，由多个绿光LED 202串联组成的绿光LED子组，以及由多个蓝光LED 203串联组成的蓝光LED子组，如图1所示，本实施例中以红光LED201、绿光LED 202和蓝光LED203数量相等且均为4个为例，来介绍背光源；然而在其他实施例中红光LED201、绿光LED 202和蓝光LED 203数量可以不相同。
应当理解的是，在一些应用场景中本实施例中LED组20可以仅包括三个红光LED 201、绿光LED 202和蓝光LED 203。
本实施例中人眼视觉残留时间实际上就是液晶电视的场频周期，即六十分之一秒。本实施例中的在预定周期内顺序发光指的是：在预设周期内首先红光LED 201发光、绿光202和蓝光LED 203不发光，接着绿光LED 202发光、红光201和蓝光LED 203不发光，最后蓝光LED 203发光、红光LED 201和绿光LED 203不发光。
图1所示的背光源采用一个驱动电路来驱动RGB LED灯组，使其在人眼的视觉残留时间内顺序发光；与现有技术相比，可以简化驱动线路，降低制作难度，降低背光驱动的成本。
优选地，本实施例中所述控制信号可以包括：第一控制信号Con和第二控制信号Drv；所述第一控制信号Con为周期性的控制信号，且在一个周期内顺序出现第一低电平、高电平和第二低电平；本实施例中第一低电平和第二低电平可以为相同的低电平，例如为0等；
所述第二控制信号Drv为周期性的控制信号，且在一个周期内顺序出现第一电平Drv1、第二电平Drv2和第三电平Drv3；所述第二控制信号的周期与所述预定周期；
所述第一电平Drv1与Con的第一低电平对应，所述第二电平Drv2与Con的高电平对应，所述第三电平Drv3与Con的第二低电平对应；这里的对应指的是：在一个周期内，Drv1出现时，Con的第一低电平也出现，同理，Drv2出现时，Con的高低电平也出现，Drv3出现时，Con的第二低电平也出现。
所述驱动电路40，用于
在所述第二控制信号Drv的电平为第一电平Drv1，且所述第一控制信号Con的电平为第一低电平时，仅驱动所述红光LED 201发光；
在所述第二控制信号Drv的电平为第二电平Drv2，且第一控制信号Con的电平为高电平时，仅驱动所述绿光LED 202发光；
在所述第二控制信号Drv的电平为第三电平Drv3，且第一控制信号Con的电平为第二低电平时，仅驱动所述蓝光LED 203发光。
本实施例中第二控制信号Drv的不同电平对应不同颜色LED发光，其中，第一电平、第二电平和第三电平之间的大小关系，以及这三个电平的具体取值可以根据实际需求或者实际应用场景进行设定。
如图2所示，介绍背光源的的一种优选结构，其中，所述背光源还包括：用于输出第一预设电压V1的第一电压输出单元501，用于输出第二预设电压V2的第二电压输出单元502，用于输出第三预设电压V3的第三电压输出单元503；
驱动电路包括：用于输出所述第一控制信号Con的第一信号输出单元401、用于输出所述第二控制信号Drv的第二信号输出单元402和开关管403；所述开关管403具有控制端4031、输入端4032和输出端4033；
优选地，本实施例中第一信号输出单元可以根据脉冲信号生成第一控制信号Con；具体地，第一控制信号Con的周期可以为脉冲信号CLK的两倍，且高低电平均与CLK高低电平相同；
或者第一信号输出单元401也可以为一个输入端，接收外部输入的第一控制信号Con；
所述第一信号输出单元401与所述开关管403的控制端4031连接，所述开关管403的输出端4033与所述绿光LED202的正极连接；
所述第二信号输出单元402分别与所述红光LED201的负极、所述开关管403的输入端4032、所述蓝光LED203的正极连接；
所述红光LED201的正极与所述第一电压输出单元501连接，所述绿光LED202的负极与第二电压输出单元502连接，所述蓝光LED203的负极与第三电压输出单元503连接。
V1与Drv1之间的电压差大于或等于所述红光LED的开启电压Von1，V1与Drv1之间的电压差小于蓝光LED的开启电压Von3
V1与Drv2之间的电压差小于Von1，Drv2与V2之间的电压差大于或等于绿光LED的开启电压Von2，Drv2与V3之间的电压差小于Von3；
V1与Drv3之间的电压差小于Von1，Drv3与V3之间的电压差大于或等于Von3。
图2所示的驱动电路，可以实现在预定周期内使所述红光LED、绿光LED和蓝光LED顺序发光，具体实现过程可以为；
设红光LED子组、绿光LED子组和蓝光LED子组的开启电压均为Von，此时上述所述的Von1=Von2=Von3=Von；也即红光LED201的开启电压指的是红光LED子组的开启电压，绿光LED202的开启电压指的是绿光LED子组的开启电压，蓝光LED203的开启电压指的是蓝光LED子组的开启电压；
设V1- Drv1≥Von，Drv1-V3＜Von；V1- Drv2＜Von，Drv2-V3＜Von，Drv2-V2≥Von；V1- Drv3＜Von，Drv3-V3≥Von；
其中Von、Drv、con、V1、V2、V3均为正电压；
在一个Drv的周期内Drv1、Drv2、Drv3顺序出现，且Drv1＜Drv2＜Drv3；Drv1、Drv2、Drv3在一个Drv的周期内持续的时间相等，且等于三分之一的Drv的周期；同样Con也高低电平持续的时间相等，且等于三分之一的Drv的周期；
应当理解的是：本实施例中Drv1、Drv2、Drv3持续的时间也可以不相等，只要电平变化与Con电平变化对应即可。
参考图3所示的驱动时序，图2所示的驱动电路的具体驱动过程如下：
当Drv的电平为第一电平Drv1，Con的电平为低电平时，开关管403关闭，红光LED子组两端的电压为V1- Drv1≥Von，此时驱动红光LED子组发光；而对于绿光LED子组，由于开关管403关闭，所以绿光LED子组不发光，对于蓝光LED子组，由于蓝光LED子组两端的电压为Drv1-V3＜Von，所以蓝光LED子组不发光；
当Drv的电平为第二电平Drv2，Con的电平为高电平时，开关管403开启，红光LED子组两端的电压为V1- Drv2＜Von，红光LED子组不发光；对于绿光LED子组，由于开关管403开启，绿光LED子组两端的电压为Drv2-V2≥Von，绿光LED子组被驱动发光；对于蓝光LED子组，其两端的电压为Drv2-V3＜Von，所以不发光；
当Drv的电平为第二电平Drv3，Con的电平为低电平时，开关管403关闭，红光LED子组两端的电压为V1- Drv3＜Von，红光LED子组不发光；对于绿光LED子组，由于开关管403关闭，绿光LED子组不发光；对于蓝光LED子组，其两端的电压为Drv3-V3≥Von，所以绿光LED子组发光；
可见，通过本实施例的驱动电路可以实现在一个Drv的周期内红光LED子组、绿光LED子组和蓝光LED子组顺序发光。
优选地，本实施例中V1、V2和V3之间的大小关系可以为：V1=V3＞V2。具体地，本实施例中Drv1=0、Drv2=Von、Drv3=2Von；V1=Von、V2=0、V3=Von。
本实施例中开关管403可以为场效应晶体管，其中，控制端4031为场效应晶体管的栅极，输入端4032为场效应晶体管的源极，输出端4033为场效应晶体管的漏极。
以上主要以红光LED子组反向连接和蓝光LED子组正向连接，即红光LED201负极接Drv、正极接V1，蓝光LED203正极接Drv、负极接V3为例来介绍本实施例背光源的驱动；
然而，应当理解的是，本实施例中LED灯组中红光LED子组可以正向连接、蓝光LED子组反向连接，红光LED201正极接Drv、负极接V1，蓝光LED负极接Drv、正极接V3；此时执行改变Drv1、Drv2、Drv3、V1、V2、V3的大小即可实现在一个预定周期内红光LED子组、绿光LED子组和蓝光LED子组顺序发光；
如图4所示，所述第一信号输出单元401与所述开关管403的控制端4031连接，所述开关管403的输出端4033与所述绿光LED202的正极连接；
所述第二信号输出单元402分别与所述红光LED201的正极、所述开关管403的输入端4032、所述蓝光LED203的负极连接；
所述红光LED201的负极与所述第一电压输出单元501连接，所述绿光LED202的负极与第二电压输出单元502连接，所述蓝光LED203的正极与第三电压输出单元503连接；图4中，Drv1= 2Von、Drv2=Von、Drv3=0；V1= Von、V2= 0、V3=Von；
参考图5所示的驱动时序，图4所示背光源中驱动电路40的驱动过程如下：
当Drv的电平为第一电平Drv1，Con的电平为低电平时，开关管403关闭，红光LED子组两端的电压为Drv1- V1= Von，此时驱动红光LED子组发光；而对于绿光LED子组，由于开关管403关闭，所以绿光LED子组不发光，对于蓝光LED子组，由于蓝光LED子组中LED反向连接，此时其两端的电压为V3- Drv1=0＜Von，所以蓝光LED子组不发光；
当Drv的电平为第二电平Drv2，Con的电平为高电平时，开关管403开启，红光LED子组两端的电压为Drv2- V1=0＜Von，红光LED子组不发光；对于绿光LED子组，由于开关管403开启，绿光LED子组两端的电压为Drv2-V2= Von，绿光LED子组被驱动发光；对于蓝光LED子组，其两端的电压为Drv3-V3=0＜Von，所以不发光；
当Drv的电平为第二电平Drv3，Con的电平为低电平时，开关管403关闭，红光LED子组两端的电压为V1- Drv3=-Von＜Von，红光LED子组不发光；对于绿光LED子组，由于开关管403关闭，绿光LED子组不发光；对于蓝光LED子组，其两端的电压为Drv3-V3=Von，所以绿光LED子组发光。
综上所述，虽然本发明已以优选实施例揭露如上，但上述优选实施例并非用以限制本发明，本领域的普通技术人员，在不脱离本发明的精神和范围内，均可作各种更动与润饰，因此本发明的保护范围以权利要求界定的范围为准。

Claims (20)

  1. 一种背光源，应用于场序列液晶显示器，所述背光源包括：
    电路基板；
    LED灯组，所述LED灯组包括：LED基板和设置在所述LED基板上的红光LED、绿光LED和蓝光LED；
    散热板，所述散热板用于对所述LED组散热，所述LED灯组设置在所述散热板上；以及
    驱动电路，所述驱动电路设置在所述电路基板上，所述驱动电路用于获取控制信号，并根据所述控制信号驱动所述红光LED、所述绿光LED和所述蓝光LED在预定周期内顺序发光，所述预定周期小于或等于人眼的视觉残留时间；
    其中，所述控制信号包括：第一控制信号和第二控制信号；
    所述第一控制信号为周期性的控制信号，且在一个周期内顺序出现第一低电平、高电平和所述第二低电平；
    所述第二控制信号为周期性的控制信号，且在一个周期内顺序出现与所述第一低电平对应的第一电平、与所述高电平对应的第二电平和与所述第二低电平对应的第三电平；所述第二控制信号的周期与所述预定周期相同；
    所述驱动电路，具体用于：
    在所述第二控制信号的电平为第一电平，且所述第一控制信号的电平为第一低电平时，仅驱动所述红光LED发光；
    在所述第二控制信号的电平为第二电平，且第一控制信号的电平为高电平时，仅驱动所述绿光LED发光；
    在所述第二控制信号的电平为第三电平，且第一控制信号的电平为第二低电平时，仅驱动所述蓝光LED发光。
  2. 如权利要求1所述的背光源，其中
    所述背光源还包括：用于输出第一预设电压的第一电压输出单元，用于输出第二预设电压的第二电压输出单元，用于输出第三预设电压的第三电压输出单元；
    所述驱动电路包括：用于输出所述第一控制信号的第一信号输出单元、用于输出所述第二控制信号的第二信号输出单元和开关管；所述开关管具有控制端、输入端和输出端；
    所述第一信号输出单元与所述开关管的控制端连接，所述开关管的输出端与所述绿光LED的正极连接；
    所述第二信号输出单元分别与所述红光LED的负极、所述开关管的输入端、所述蓝光LED的正极连接；
    所述红光LED的正极与所述第一电压输出单元连接，所述绿光LED的负极与第二电压输出单元连接，所述蓝光LED的负极与第三电压输出单元连接。
  3. 权利要求2所述的背光源，其中
    所述第一预设电压与所述第一电平的电压差大于或等于所述红光LED的开启电压，所述第一电平与所述第三预设电压的电压差小于蓝光LED的开启电压；
    所述第一预设电压与所述第二电平的电压差小于红光LED的开启电压，所述第二电平与所述第二预设电压的电压差大于等于绿光LED的开启电压，所述第二电平与所述第三预设电压的电压差小于蓝光LED的开启电压；
    所述第一预设电压与所述第三电平的电压差小于红光LED的开启电压，所述第三电平与所述第三预设电压的电压差大于或等于蓝光LED的开启电压。
  4. 如权利要求3所述的背光源，其中所述第三电平大于所述第二电平，所述第二电平大于所述第一电平。
  5. 如权利要求4所述的背光源，其中所述第一预设电压与所述第三预设电压相等，所述第二预设电压小于所述第一预设电压。
  6. 如权利要求5所述的背光源，其中所述第一电平为0，所述第二电平为Von，所述第三电平为2Von，所述第一预设电压为Von，所述第二预设电压为0，所述第三预设电压为Von，Von为红光LED串、绿光LED串和所述蓝光LED串的开启电压。
  7. 如权利要求1所述的背光源，其中
    所述背光源还包括：用于输出第一预设电压的第一电压输出单元，用于输出第二预设电压第二电压输出单元，用于输出第三预设电压的第三电压输出单元；
    所述驱动电路包括：用于生成所述第一控制信号的第一信号输出单元、用于生成所述第二控制信号的第二信号输出单元和开关管；所述开关管具有控制端、输入端和输出端；
    所述第一信号输出单元与所述开关管的控制端连接，所述开关管的输出端与所述绿光LED的正极连接；
    所述第二信号输出单元分别与所述红光LED的正极、所述开关管的输入端、所述蓝光LED的负极连接；
    所述红光LED的负极与所述第一电压输出单元连接，所述绿光LED的负极与第二电压输出单元连接，所述蓝光LED的正极与第三电压输出单元连接。
  8. 如权利要求2所述的背光源，其中
    在一个所述第二控制信号的周期内，所述第一电平的持续时间、所述第二电平的持续时间，所述第二电平的持续时间相等，所述第一电平的持续时间为所述第二控制信号周期的三分之一。
  9. 如权利要求1所述的背光源，其中所述第一低电平与所述第二低电平相同。
  10. 一种背光源，应用于场序列液晶显示器，所述背光源包括：
    电路基板；
    LED灯组，所述LED灯组包括：LED基板和设置在所述LED基板上的红光LED、绿光LED和蓝光LED；以及
    驱动电路，所述驱动电路设置在所述电路基板上，所述驱动电路用于获取控制信号，并根据所述控制信号驱动所述红光LED、所述绿光LED和所述蓝光LED在预定周期内顺序发光，所述预定周期小于或等于人眼的视觉残留时间。
  11. 如权利要求10所述的背光源，其中所述控制信号包括：第一控制信号和第二控制信号；
    所述第一控制信号为周期性的控制信号，且在一个周期内顺序出现第一低电平、高电平和所述第二低电平；
    所述第二控制信号为周期性的控制信号，且在一个周期内顺序出现与所述第一低电平对应的第一电平、与所述高电平对应的第二电平和与所述第二低电平对应的第三电平；所述第二控制信号的周期与所述预定周期相同；
    所述驱动电路，用于
    在所述第二控制信号的电平为第一电平，且所述第一控制信号的电平为第一低电平时，仅驱动所述红光LED发光；
    在所述第二控制信号的电平为第二电平，且第一控制信号的电平为高电平时，仅驱动所述绿光LED发光；
    在所述第二控制信号的电平为第三电平，且第一控制信号的电平为第二低电平时，仅驱动所述蓝光LED发光。
  12. 如权利要求11所述的背光源，其中
    所述背光源还包括：用于输出第一预设电压的第一电压输出单元，用于输出第二预设电压的第二电压输出单元，用于输出第三预设电压的第三电压输出单元；
    所述驱动电路包括：用于输出所述第一控制信号的第一信号输出单元、用于输出所述第二控制信号的第二信号输出单元和开关管；所述开关管具有控制端、输入端和输出端；
    所述第一信号输出单元与所述开关管的控制端连接，所述开关管的输出端与所述绿光LED的正极连接；
    所述第二信号输出单元分别与所述红光LED的负极、所述开关管的输入端、所述蓝光LED的正极连接；
    所述红光LED的正极与所述第一电压输出单元连接，所述绿光LED的负极与第二电压输出单元连接，所述蓝光LED的负极与第三电压输出单元连接。
  13. 如权利要求12所述的背光源，其中
    所述第一预设电压与所述第一电平的电压差大于或等于所述红光LED的开启电压，所述第一电平与所述第三预设电压的电压差小于蓝光LED的开启电压；
    所述第一预设电压与所述第二电平的电压差小于红光LED的开启电压，所述第二电平与所述第二预设电压的电压差大于等于绿光LED的开启电压，所述第二电平与所述第三预设电压的电压差小于蓝光LED的开启电压；
    所述第一预设电压与所述第三电平的电压差小于红光LED的开启电压，所述第三电平与所述第三预设电压的电压差大于或等于蓝光LED的开启电压。
  14. 如权利要求13所述的背光源，其中所述第三电平大于所述第二电平，所述第二电平大于所述第一电平。
  15. 如权利要求14所述的背光源，其中所述第一预设电压与所述第三预设电压相等，所述第二预设电压小于所述第一预设电压。
  16. 如权利要求15所述的背光源，其中所述第一电平为0，所述第二电平为Von，所述第三电平为2Von，所述第一预设电压为Von，所述第二预设电压为0，所述第三预设电压为Von，Von为红光LED串、绿光LED串和所述蓝光LED串的开启电压。
  17. 如权利要求11所述的背光源，其中
    所述背光源还包括：用于输出第一预设电压的第一电压输出单元，用于输出第二预设电压第二电压输出单元，用于输出第三预设电压的第三电压输出单元；
    所述驱动电路包括：用于生成所述第一控制信号的第一信号输出单元、用于生成所述第二控制信号的第二信号输出单元和开关管；所述开关管具有控制端、输入端和输出端；
    所述第一信号输出单元与所述开关管的控制端连接，所述开关管的输出端与所述绿光LED的正极连接；
    所述第二信号输出单元分别与所述红光LED的正极、所述开关管的输入端、所述蓝光LED的负极连接；
    所述红光LED的负极与所述第一电压输出单元连接，所述绿光LED的负极与第二电压输出单元连接，所述蓝光LED的正极与第三电压输出单元连接。
  18. 如权利要求12所述的背光源，其中在一个所述第二控制信号的周期内，所述第一电平的持续时间、所述第二电平的持续时间，所述第二电平的持续时间相等，所述第一电平的持续时间为所述第二控制信号周期的三分之一。
  19. 如权利要求1所述的背光源，其中所述背光源还包括：用于对所述LED组散热的散热板，所述LED灯组设置在所述散热板上。
  20. 如权利要求1所述的背光源，其中所述第一控制信号的周期与所述第二控制信的周期相等。
PCT/CN2015/086486 2015-07-31 2015-08-10 一种背光源 Ceased WO2017020330A1 (zh)

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