WO2016197541A1 - Led灯条结构及其控制方法、背光模组、液晶显示装置 - Google Patents

Led灯条结构及其控制方法、背光模组、液晶显示装置 Download PDF

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Publication number
WO2016197541A1
WO2016197541A1 PCT/CN2015/094717 CN2015094717W WO2016197541A1 WO 2016197541 A1 WO2016197541 A1 WO 2016197541A1 CN 2015094717 W CN2015094717 W CN 2015094717W WO 2016197541 A1 WO2016197541 A1 WO 2016197541A1
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Prior art keywords
led
sequence
light bar
bar structure
leds
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Ceased
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PCT/CN2015/094717
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English (en)
French (fr)
Inventor
陈贺
胡宇飞
董慧
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BOE Technology Group Co Ltd
Hefei Xinsheng Optoelectronics Technology Co Ltd
Original Assignee
BOE Technology Group Co Ltd
Hefei Xinsheng Optoelectronics Technology Co Ltd
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Application filed by BOE Technology Group Co Ltd, Hefei Xinsheng Optoelectronics Technology Co Ltd filed Critical BOE Technology Group Co Ltd
Priority to US15/038,349 priority Critical patent/US9915778B2/en
Publication of WO2016197541A1 publication Critical patent/WO2016197541A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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]
    • H05B45/10—Controlling the intensity of the light
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V19/00—Fastening of light sources or lamp holders
    • F21V19/001—Fastening of light sources or lamp holders the light sources being semiconductors devices, e.g. LEDs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V23/00—Arrangement of electric circuit elements in or on lighting devices
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
    • G02B6/0068—Arrangements of plural sources, e.g. multi-colour light sources
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
    • G02B6/0083—Details of electrical connections of light sources to drivers, circuit boards, or the like
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
    • G02B6/0086—Positioning aspects
    • G02B6/009—Positioning aspects of the light source in the package
    • 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
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • 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
    • G02F1/133611—Direct backlight including means for improving the brightness uniformity
    • 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]
    • H05B45/30—Driver circuits
    • H05B45/31—Phase-control circuits
    • 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]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]
    • H05B45/39—Circuits containing inverter bridges
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00—Printed circuits
    • H05K1/02—Details
    • H05K1/0277—Bendability or stretchability details
    • H05K1/028—Bending or folding regions of flexible printed circuits
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00—Printed circuits
    • H05K1/18—Printed circuits structurally associated with non-printed electric components
    • H05K1/189—Printed circuits structurally associated with non-printed electric components characterised by the use of flexible or folded printed circuits
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
    • G02B6/0073—Light emitting diode [LED]
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/09—Shape and layout
    • H05K2201/09209—Shape and layout details of conductors
    • H05K2201/09372—Pads and lands
    • H05K2201/09409—Multiple rows of pads, lands, terminals or dummy patterns; Multiple rows of mounted components
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/09—Shape and layout
    • H05K2201/09209—Shape and layout details of conductors
    • H05K2201/09654—Shape and layout details of conductors covering at least two types of conductors provided for in H05K2201/09218 - H05K2201/095
    • H05K2201/09709—Staggered pads, lands or terminals; Parallel conductors in different planes
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
    • H05K2201/10007—Types of components
    • H05K2201/10106—Light emitting diode [LED]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Definitions

  • the present invention relates to the field of display technologies, and in particular, to an LED light bar structure and a control method thereof, a backlight module, and a liquid crystal display device.
  • the light emission angle of the LED 101 is less than 180 degrees; between the adjacent two LEDs 101, 101' An area 102 in which dark areas overlap will be created, the brightness of this area being significantly lower than the area 103 to which the LED light can be illuminated, resulting in alternating bright spots and dark spots.
  • the present invention provides an LED light bar structure, the LED light bar structure comprising:
  • At least a first LED sequence and a second LED sequence disposed in parallel on the circuit board, the first LED sequence having a plurality of predetermined intervals, and each of the second LED sequences respectively corresponding to the One of a plurality of predetermined intervals.
  • the LED light bar structure In the LED light bar structure according to the embodiment of the present invention, two columns of LEDs are arranged in parallel on the circuit board, and a dark area generated by one column of light bars falls exactly in the bright area of the other light bar, thereby eliminating the hot spot phenomenon.
  • the improvement effect is more significant than reducing the spacing between the LEDs; and, compared to a single row of light bars, the double row of light bars can pass
  • the circuit control selects which column of light bars is lit, and by alternately lighting the two columns of light bars at a set frequency, the hot spot phenomenon can be eliminated more energy-savingly.
  • the plurality of predetermined intervals of the first LED sequence are the same.
  • Arranging the LEDs in the LED sequence at the same spacing ensures a more uniform distribution of the bright areas of the individual LEDs, thereby enhancing the illumination uniformity of the LED strip structure.
  • the LEDs in the first LED sequence and the LEDs in the second LED sequence have the same size.
  • the illumination uniformity of the LED light bar structure can be further enhanced.
  • the LEDs in the first LED sequence and the LEDs in the second LED sequence have the same alignment direction.
  • the light emitted by each LED can be distributed in substantially the same direction, which is advantageous for light extraction.
  • the LEDs in the first LED sequence and the LEDs in the second LED sequence have the same illumination parameters.
  • LEDs having the same illumination parameters to form the first LED sequence and the second LED sequence can further enhance the illumination uniformity of the LED strip structure.
  • the circuit board is a flexible circuit board.
  • the LED light bar structure is assembled by using a flexible circuit board, so that the LED light bar structure can be applied to different shapes of lighting devices, light emitting devices or display devices.
  • the LED light bar structure further comprises:
  • a pulse width generator for generating a frequency signal
  • a delayer and an inverter connected to the pulse width generator; the delay and the inverter simultaneously receive a frequency signal from a pulse width generator, and the delay and the inverter respectively generate mutually inverted a first drive signal and a second drive signal.
  • an inverter In order to obtain two columns of mutually inverted signals, an inverter can be used.
  • the inverter has a time delay, so a delay is used on the other signal line, which ensures that the signal after passing through the inverter and the signal after passing through the delay are 180 degrees out of phase, that is, mutually inverted.
  • the delayer and the inverter respectively supply the first driving signal and the second driving signal to the first LED sequence and the second LED sequence such that the first LED sequence and the second LED sequence Alternating light.
  • the double-column light bar can be selected by the circuit control to select which light bar is lit. By alternately lighting the two light bars at a set frequency, the hot spot phenomenon can be eliminated more energy-savingly.
  • the invention also provides a backlight module, the backlight module comprising:
  • the present invention also provides a liquid crystal display device comprising the backlight module as described in the above embodiments.
  • the two columns of LEDs are flat The rows are arranged on the circuit board, and the dark areas generated by one column of light strips fall exactly in the bright areas of the other light strips, thereby eliminating hot spots.
  • the improvement effect is more significant than reducing the spacing between the LEDs; and, compared to a single row of light bars, the double row of light bars can pass
  • the circuit control selects which column of light bars is lit, and by alternately lighting the two columns of light bars at a set frequency, the hot spot phenomenon can be eliminated more energy-savingly.
  • the present invention also provides a method of controlling the structure of an LED light bar as described in the above embodiments, the method comprising:
  • the first driving signal and the second driving signal are mutually inverted, such that the first LED sequence and the first The two LED sequences alternately illuminate.
  • two columns of LEDs are arranged in parallel on the circuit board, and a dark area generated by one column of light bars falls exactly in the bright area of the other column of light bars, thereby eliminating hot spots.
  • the improvement effect is more significant than reducing the spacing between the LEDs; and, compared to a single row of light bars, the double row of light bars can pass
  • the circuit control selects which column of light bars is lit, and by alternately lighting the two columns of light bars at a set frequency, the hot spot phenomenon can be eliminated more energy-savingly.
  • providing the first driving signal and the second driving signal to the first LED sequence and the second LED sequence respectively comprises:
  • the double-column light bar can be selected by the circuit control to select which light bar is lit. By alternately lighting the two light bars at a set frequency, the hot spot phenomenon can be eliminated more energy-savingly.
  • the frequencies of the first driving signal and the second driving signal are greater than 12 Hz.
  • the first LED sequence and the second LED sequence are alternately illuminated at a frequency greater than 12 Hz so that the blinking of the LED is no longer noticeable to the human eye.
  • the frequencies of the first driving signal and the second driving signal are greater than 24 Hz.
  • the degree of fatigue of the human eye can be further reduced.
  • the frequencies of the first driving signal and the second driving signal are greater than 60 Hz.
  • the stimulation of the LED blinking to the human eye can be further reduced, thereby further reducing the degree of fatigue of the human eye.
  • FIG. 1 is a schematic diagram showing the principle of generating hotspots in the prior art
  • FIG. 2 is a schematic view showing the structure of an LED light bar according to an embodiment of the present invention.
  • FIG. 3 is a circuit diagram showing a structure for controlling an LED light bar according to an embodiment of the present invention.
  • FIG. 4 is a schematic diagram showing control signals of an LED light bar structure in accordance with an embodiment of the present invention.
  • FIG. 5 shows a schematic diagram of a backlight module in accordance with an embodiment of the present invention.
  • LED light bar structure 200 includes:
  • circuit board 201 a circuit board 201
  • the LED light bar structure In the LED light bar structure according to the embodiment of the present invention, two columns of LEDs are arranged in parallel on the circuit board, and a dark area generated by one column of light bars falls exactly in the bright area of the other light bar, thereby eliminating the hot spot phenomenon.
  • the improvement effect is more significant than reducing the spacing between the LEDs; and, compared to a single row of light bars, the double row of light bars can pass
  • the circuit control selects which column of light bars is lit, and by alternately lighting the two columns of light bars at a set frequency, the hot spot phenomenon can be eliminated more energy-savingly.
  • the plurality of predetermined intervals of the first LED sequence 202 are the same.
  • Arranging the LEDs in the LED sequence at the same spacing ensures a more uniform distribution of the bright areas of the individual LEDs, thereby enhancing the illumination uniformity of the LED strip structure.
  • the LEDs in the first LED sequence 202 and the LEDs in the second LED sequence 203 have the same size.
  • the illumination uniformity of the LED light bar structure can be further enhanced.
  • the LEDs in the first LED sequence and the LEDs in the second LED sequence have the same alignment direction.
  • the light emitted by each LED can be distributed in substantially the same direction, which is advantageous for light extraction.
  • the LEDs in the first LED sequence and the LEDs in the second LED sequence have the same illumination parameters.
  • LEDs having the same illumination parameters to form the first LED sequence and the second LED sequence can further enhance the illumination uniformity of the LED strip structure.
  • the circuit board 201 is a flexible circuit board.
  • the LED light bar structure is assembled by using a flexible circuit board, so that the LED light bar structure can be applied to different shapes of lighting devices, light emitting devices or display devices.
  • FIG. 3 is a circuit diagram showing a structure for controlling an LED light bar according to an embodiment of the present invention
  • FIG. 4 is a schematic diagram showing a control signal of an LED light bar structure according to an embodiment of the present invention.
  • the LED light bar structure further includes:
  • a pulse width generator 301 for generating a frequency signal
  • the controller 303 generates a first driving signal 401 and a second driving signal 402 which are mutually inverted, as shown in FIG.
  • an inverter In order to obtain two columns of mutually inverted signals, an inverter can be used.
  • the inverter has a time delay, so a delay is used on the other signal line, which ensures that the signal after passing through the inverter and the signal after passing through the delay are 180 degrees out of phase, that is, mutually inverted.
  • the delay 302 and the inverter 303 provide the first driving signal 401 and the second driving signal 402 to the first LED sequence 202 and the second LED sequence 203, respectively, such that the first LED Sequence 202 and second LED sequence 203 alternately illuminate.
  • double-column light bars can be selected by circuit control to select which light bar When it is lit, by alternately lighting two rows of light bars at a set frequency, the hot spot phenomenon can be eliminated more energy-savingly.
  • the present invention also provides a backlight module.
  • the backlight module 500 includes:
  • the present invention also provides a liquid crystal display device comprising the backlight module as described in the above embodiments.
  • two columns of LEDs are arranged in parallel on the circuit board, and a dark area generated by one column of light bars falls exactly in the bright area of the other light bar, thereby eliminating hot spots.
  • the improvement effect is more significant than reducing the spacing between the LEDs; and, compared to a single row of light bars, the double row of light bars can pass
  • the circuit control selects which column of light bars is lit, and by alternately lighting the two columns of light bars at a set frequency, the hot spot phenomenon can be eliminated more energy-savingly.
  • the present invention also provides a method of controlling the structure of an LED light bar as described in the above embodiments, the method comprising:
  • the first driving signal and the second driving signal are mutually inverted, such that the first LED sequence and the first The two LED sequences alternately illuminate.
  • two columns of LEDs are arranged in parallel on the circuit board, and a dark area generated by one column of light bars falls exactly in the bright area of the other column of light bars, thereby eliminating hot spots.
  • the improvement effect is more significant than reducing the spacing between the LEDs; and, compared to a single row of light bars, the double row of light bars can pass
  • the circuit control selects which column of light bars is lit, and by alternately lighting the two columns of light bars at a set frequency, the hot spot phenomenon can be eliminated more energy-savingly.
  • providing the first driving signal and the second driving signal to the first LED sequence and the second LED sequence respectively comprises:
  • the double-column light bar can be selected by the circuit control to select which light bar is lit. By alternately lighting the two light bars at a set frequency, the hot spot phenomenon can be eliminated more energy-savingly.
  • the frequencies of the first driving signal and the second driving signal are greater than 12 Hz.
  • the first LED sequence and the second LED sequence are alternately illuminated at a frequency greater than 12 Hz so that the blinking of the LED is no longer noticeable to the human eye.
  • the frequencies of the first driving signal and the second driving signal are greater than 24 Hz.
  • the degree of fatigue of the human eye can be further reduced.
  • the frequencies of the first driving signal and the second driving signal are greater than 60 Hz.
  • the stimulation of the LED blinking to the human eye can be further reduced, thereby further reducing the degree of fatigue of the human eye.
  • two columns of LEDs are arranged in parallel on the circuit board, and a dark area generated by one column of light strips falls exactly in the bright area of the other column of light strips, thereby eliminating hot spots.
  • the improvement effect is more significant than reducing the spacing between the LEDs; and, compared to a single row of light bars, the double row of light bars can pass
  • the circuit control selects which column of light bars is lit, and by alternately lighting the two columns of light bars at a set frequency, the hot spot phenomenon can be eliminated more energy-savingly.

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Nonlinear Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • General Engineering & Computer Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Planar Illumination Modules (AREA)
  • Liquid Crystal (AREA)
  • Liquid Crystal Display Device Control (AREA)

Abstract

一种LED灯条结构、背光模组、液晶显示装置以及控制LED灯条结构的方法。LED灯条结构（200）包括：电路板（201）；以及平行布置在电路板上的至少第一LED序列（202）和第二LED序列（203），第一LED序列具有多个预定的间隔，并且第二LED序列中的每个LED分别对应于多个预定的间隔之一。两列LED平行排列在电路板上，一列灯条产生的暗区正好落在另一列灯条的亮区内，从而消除了热点现象。通过以一定的脉冲频率交替地点亮两列灯条中其中一列，相比于减小LED之间的间距，改善效果更加明显；并且，相比于单列的灯条，双列灯条可以通过电路控制选择哪一列灯条点亮，通过以设定的频率交替地点亮两列灯条，可以更加节能地消除热点现象。

Description

LED灯条结构及其控制方法、背光模组、液晶显示装置 技术领域
本发明涉及显示技术领域，尤其涉及一种LED灯条结构及其控制方法、背光模组、以及液晶显示装置。
背景技术
在现有的LED灯条中，由于混光不均会产生热点(hotspot)现象：如图1所示，LED 101的光线发射角小于180度；在相邻的两颗LED101、101’之间会产生暗区重叠的区域102，此区域的亮度会明显低于LED光线能够照射到的区域103，从而导致交替的亮斑和暗斑。
发明内容
有鉴于此，本发明提供了一种LED灯条结构，所述LED灯条结构包括：
电路板；以及
平行布置在所述电路板上的至少第一LED序列和第二LED序列，所述第一LED序列具有多个预定的间隔，并且所述第二LED序列中的每个LED分别对应于所述多个预定的间隔之一。
在根据本发明实施例的LED灯条结构中，两列LED平行排列在电路板上，一列灯条产生的暗区正好落在另一列灯条的亮区内，从而消除了热点现象。通过以一定的脉冲频率交替地点亮两列灯条中其中一列，相比于减小LED之间的间距，改善效果更加明显；并且，相比于单列的灯条，双列灯条可以通过电路控制选择哪一列灯条点亮，通过以设定的频率交替地点亮两列灯条，可以更加节能地消除热点现象。
较佳地，所述第一LED序列的多个预定的间隔是相同的。
以相同的间隔将LED布置在LED序列中，能够确保各个LED的亮区分布更加均匀，从而增强LED灯条结构的照明均匀性。
较佳地，所述第一LED序列中的LED和第二LED序列中的LED具有相同的尺寸。
利用相同尺寸的LED构成第一LED序列和第二LED序列，能够进一步增强LED灯条结构的照明均匀性。
较佳地，所述第一LED序列中的LED和第二LED序列中的LED具有相同的排列方向。
将第一LED序列中的LED和第二LED序列中的LED以相同的排列方向进行布置，可以使各个LED发出的光分布在大致相同的方向内，有利于光的提取。
较佳地，所述第一LED序列中的LED和第二LED序列中的LED具有相同的发光参数。
使用具有相同的发光参数的LED构成第一LED序列和第二LED序列，能够进一步增强LED灯条结构的照明均匀性。
较佳地，所述电路板为柔性电路板。
利用柔性电路板组装LED灯条结构，使得LED灯条结构能够适用于不同形状的照明装置、发光装置或显示装置。
较佳地，所述LED灯条结构还包括：
脉宽发生器，用于产生频率信号；以及
与所述脉宽发生器连接的延迟器和反相器；所述延迟器和反相器同时接收来自脉宽发生器的频率信号，并且所述延迟器和反相器分别产生相互反相的第一驱动信号和第二驱动信号。
为了获得两列相互反相的信号，可以采用反相器。反相器有时间延迟的作用，所以在另一信号线路上采用了延迟器，这样可以确保经过反相器后的信号和经过延迟器后的信号相位相差180度，即相互反相。
较佳地，所述延迟器和反相器分别向所述第一LED序列和第二LED序列提供所述第一驱动信号和第二驱动信号，使得所述第一LED序列和第二LED序列交替发光。
相比于单列的灯条，双列灯条可以通过电路控制选择哪一列灯条点亮，通过以设定的频率交替地点亮两列灯条，可以更加节能地消除热点现象。
本发明还提供了一种背光模组，所述背光模组包括：
导光板，所述导光板具有入光面；以及
如以上实施例所述的LED灯条结构，其中所述第一LED序列和第二LED序列的出光面与所述导光板的入光面相对。
本发明还提供了一种液晶显示装置，所述液晶显示装置包括如以上实施例所述的背光模组。
在根据本发明实施例的背光模组和液晶显示装置中，两列LED平 行排列在电路板上，一列灯条产生的暗区正好落在另一列灯条的亮区内，从而消除了热点现象。通过以一定的脉冲频率交替地点亮两列灯条中其中一列，相比于减小LED之间的间距，改善效果更加明显；并且，相比于单列的灯条，双列灯条可以通过电路控制选择哪一列灯条点亮，通过以设定的频率交替地点亮两列灯条，可以更加节能地消除热点现象。
本发明还提供了一种控制如以上实施例所述的LED灯条结构的方法，所述方法包括：
分别向所述第一LED序列和第二LED序列提供第一驱动信号和第二驱动信号；所述第一驱动信号和第二驱动信号是相互反相的，使得所述第一LED序列和第二LED序列交替发光。
在根据本发明实施例的控制方法中，两列LED平行排列在电路板上，一列灯条产生的暗区正好落在另一列灯条的亮区内，从而消除了热点现象。通过以一定的脉冲频率交替地点亮两列灯条中其中一列，相比于减小LED之间的间距，改善效果更加明显；并且，相比于单列的灯条，双列灯条可以通过电路控制选择哪一列灯条点亮，通过以设定的频率交替地点亮两列灯条，可以更加节能地消除热点现象。
较佳地，分别向所述第一LED序列和第二LED序列提供第一驱动信号和第二驱动信号包括：
利用脉宽发生器产生频率信号；以及
利用与所述脉宽发生器连接的延迟器和反相器同时接收来自脉宽发生器的频率信号，并且利用所述延迟器和反相器分别产生相互反相的第一驱动信号和第二驱动信号。
相比于单列的灯条，双列灯条可以通过电路控制选择哪一列灯条点亮，通过以设定的频率交替地点亮两列灯条，可以更加节能地消除热点现象。
较佳地，所述第一驱动信号和第二驱动信号的频率大于12Hz。
将第一LED序列和第二LED序列以大于12Hz的频率交替点亮，使得人眼不再明显察觉到LED的闪烁。
较佳地，所述第一驱动信号和第二驱动信号的频率大于24Hz。
将第一LED序列和第二LED序列以大于12Hz的频率交替点亮，能够进一步减轻人眼的疲劳程度。
较佳地，所述第一驱动信号和第二驱动信号的频率大于60Hz。
将第一LED序列和第二LED序列以大于12Hz的频率交替点亮，能够进一步减小LED闪烁对人眼的刺激，从而进一步减轻人眼的疲劳程度。
附图说明
图1示出了现有技术中热点的产生原理示意图；
图2示出了根据本发明实施例的LED灯条结构的示意图；
图3示出了根据本发明实施例的控制LED灯条结构的电路示意图；
图4示出了根据本发明实施例的LED灯条结构的控制信号示意图；以及
图5示出了根据本发明实施例的背光模组的示意图。
具体实施方式
下面结合附图，对本发明实施例提供的LED灯条结构、背光模组、液晶显示装置以及控制所述LED灯条结构的方法的具体实施方式进行详细地说明。
图2示出了根据本发明实施例的LED灯条结构的示意图，其中所述LED灯条结构200包括：
电路板201；以及
平行布置在所述电路板201上的至少第一LED序列202和第二LED序列203，所述第一LED序列202具有多个预定的间隔，并且所述第二LED序列203中的每个LED分别对应于所述多个预定的间隔之
在根据本发明实施例的LED灯条结构中，两列LED平行排列在电路板上，一列灯条产生的暗区正好落在另一列灯条的亮区内，从而消除了热点现象。通过以一定的脉冲频率交替地点亮两列灯条中其中一列，相比于减小LED之间的间距，改善效果更加明显；并且，相比于单列的灯条，双列灯条可以通过电路控制选择哪一列灯条点亮，通过以设定的频率交替地点亮两列灯条，可以更加节能地消除热点现象。
较佳地，所述第一LED序列202的多个预定的间隔是相同的。
以相同的间隔将LED布置在LED序列中，能够确保各个LED的亮区分布更加均匀，从而增强LED灯条结构的照明均匀性。
较佳地，所述第一LED序列202中的LED和第二LED序列203中的LED具有相同的尺寸。
利用相同尺寸的LED构成第一LED序列和第二LED序列，能够进一步增强LED灯条结构的照明均匀性。
较佳地，所述第一LED序列中的LED和第二LED序列中的LED具有相同的排列方向。
将第一LED序列中的LED和第二LED序列中的LED以相同的排列方向进行布置，可以使各个LED发出的光分布在大致相同的方向内，有利于光的提取。
较佳地，所述第一LED序列中的LED和第二LED序列中的LED具有相同的发光参数。
使用具有相同的发光参数的LED构成第一LED序列和第二LED序列，能够进一步增强LED灯条结构的照明均匀性。
较佳地，所述电路板201为柔性电路板。
利用柔性电路板组装LED灯条结构，使得LED灯条结构能够适用于不同形状的照明装置、发光装置或显示装置。
图3示出了根据本发明实施例的控制LED灯条结构的电路示意图；图4示出了根据本发明实施例的LED灯条结构的控制信号示意图。
较佳地，如图3所示，所述LED灯条结构还包括：
脉宽发生器301，用于产生频率信号；以及
与所述脉宽发生器301连接的延迟器302和反相器303；所述延迟器302和反相器303同时接收来自脉宽发生器301的频率信号，并且所述延迟器302和反相器303分别产生相互反相的第一驱动信号401和第二驱动信号402，如图4所示。
为了获得两列相互反相的信号，可以采用反相器。反相器有时间延迟的作用，所以在另一信号线路上采用了延迟器，这样可以确保经过反相器后的信号和经过延迟器后的信号相位相差180度，即相互反相。
较佳地，所述延迟器302和反相器303分别向所述第一LED序列202和第二LED序列203提供所述第一驱动信号401和第二驱动信号402，使得所述第一LED序列202和第二LED序列203交替发光。
相比于单列的灯条，双列灯条可以通过电路控制选择哪一列灯条 点亮，通过以设定的频率交替地点亮两列灯条，可以更加节能地消除热点现象。
本发明还提供了一种背光模组，如图5所示，所述背光模组500包括：
导光板501，所述导光板501具有入光面502；以及
如以上实施例所述的LED灯条结构503，其中所述第一LED序列和第二LED序列的出光面与所述导光板501的入光面502相对。
本发明还提供了一种液晶显示装置，所述液晶显示装置包括如以上实施例所述的背光模组。
在根据本发明实施例的背光模组和液晶显示装置中，两列LED平行排列在电路板上，一列灯条产生的暗区正好落在另一列灯条的亮区内，从而消除了热点现象。通过以一定的脉冲频率交替地点亮两列灯条中其中一列，相比于减小LED之间的间距，改善效果更加明显；并且，相比于单列的灯条，双列灯条可以通过电路控制选择哪一列灯条点亮，通过以设定的频率交替地点亮两列灯条，可以更加节能地消除热点现象。
本发明还提供了一种控制如以上实施例所述的LED灯条结构的方法，所述方法包括：
分别向所述第一LED序列和第二LED序列提供第一驱动信号和第二驱动信号；所述第一驱动信号和第二驱动信号是相互反相的，使得所述第一LED序列和第二LED序列交替发光。
在根据本发明实施例的控制方法中，两列LED平行排列在电路板上，一列灯条产生的暗区正好落在另一列灯条的亮区内，从而消除了热点现象。通过以一定的脉冲频率交替地点亮两列灯条中其中一列，相比于减小LED之间的间距，改善效果更加明显；并且，相比于单列的灯条，双列灯条可以通过电路控制选择哪一列灯条点亮，通过以设定的频率交替地点亮两列灯条，可以更加节能地消除热点现象。
较佳地，分别向所述第一LED序列和第二LED序列提供第一驱动信号和第二驱动信号包括：
利用脉宽发生器产生频率信号；以及
利用与所述脉宽发生器连接的延迟器和反相器同时接收来自脉宽发生器的频率信号，并且利用所述延迟器和反相器分别产生相互反相 的第一驱动信号和第二驱动信号。
相比于单列的灯条，双列灯条可以通过电路控制选择哪一列灯条点亮，通过以设定的频率交替地点亮两列灯条，可以更加节能地消除热点现象。
较佳地，所述第一驱动信号和第二驱动信号的频率大于12Hz。
将第一LED序列和第二LED序列以大于12Hz的频率交替点亮，使得人眼不再明显察觉到LED的闪烁。
较佳地，所述第一驱动信号和第二驱动信号的频率大于24Hz。
将第一LED序列和第二LED序列以大于12Hz的频率交替点亮，能够进一步减轻人眼的疲劳程度。
较佳地，所述第一驱动信号和第二驱动信号的频率大于60Hz。
将第一LED序列和第二LED序列以大于12Hz的频率交替点亮，能够进一步减小LED闪烁对人眼的刺激，从而进一步减轻人眼的疲劳程度。
根据本发明的实施例，两列LED平行排列在电路板上，一列灯条产生的暗区正好落在另一列灯条的亮区内，从而消除了热点现象。通过以一定的脉冲频率交替地点亮两列灯条中其中一列，相比于减小LED之间的间距，改善效果更加明显；并且，相比于单列的灯条，双列灯条可以通过电路控制选择哪一列灯条点亮，通过以设定的频率交替地点亮两列灯条，可以更加节能地消除热点现象。
显然，本领域的技术人员可以对本发明进行各种改动和变型而不脱离本发明的精神和范围。这样，倘若本发明的这些修改和变型属于本发明权利要求及其等同技术的范围之内，则本发明也意图包含这些改动和变型。

Claims (15)

  1. 一种LED灯条结构，其特征在于，所述LED灯条结构包括：
    电路板；以及
    平行布置在所述电路板上的至少第一LED序列和第二LED序列，所述第一LED序列具有多个预定的间隔，并且所述第二LED序列中的每个LED分别对应于所述多个预定的间隔之一。
  2. 如权利要求1所述的LED灯条结构，其特征在于，所述第一LED序列的多个预定的间隔是相同的。
  3. 如权利要求1所述的LED灯条结构，其特征在于，所述第一LED序列中的LED和第二LED序列中的LED具有相同的尺寸。
  4. 如权利要求1所述的LED灯条结构，其特征在于，所述第一LED序列中的LED和第二LED序列中的LED具有相同的排列方向。
  5. 如权利要求1所述的LED灯条结构，其特征在于，所述第一LED序列中的LED和第二LED序列中的LED具有相同的发光参数。
  6. 如权利要求1所述的LED灯条结构，其特征在于，所述电路板为柔性电路板。
  7. 如权利要求1所述的LED灯条结构，其特征在于，所述LED灯条结构还包括：
    脉宽发生器，用于产生频率信号；以及
    与所述脉宽发生器连接的延迟器和反相器；所述延迟器和反相器同时接收来自脉宽发生器的频率信号，并且所述延迟器和反相器分别产生相互反相的第一驱动信号和第二驱动信号。
  8. 如权利要求7所述的LED灯条结构，其特征在于，所述延迟器和反相器分别向所述第一LED序列和第二LED序列提供所述第一驱动信号和第二驱动信号，使得所述第一LED序列和第二LED序列交替发光。
  9. 一种背光模组，其特征在于，所述背光模组包括：
    导光板，所述导光板具有入光面；以及
    如权利要求1-8之一所述的LED灯条结构，其中所述第一LED序列和第二LED序列的出光面与所述导光板的入光面相对。
  10. 一种液晶显示装置，其特征在于，所述液晶显示装置包括如权 利要求9所述的背光模组。
  11. 一种控制如权利要求1-8所述的LED灯条结构的方法，其特征在于，所述方法包括：
    分别向所述第一LED序列和第二LED序列提供第一驱动信号和第二驱动信号；所述第一驱动信号和第二驱动信号是相互反相的，使得所述第一LED序列和第二LED序列交替发光。
  12. 如权利要求11所述的方法，其特征在于，分别向所述第一LED序列和第二LED序列提供第一驱动信号和第二驱动信号包括：
    利用脉宽发生器产生频率信号；以及
    利用与所述脉宽发生器连接的延迟器和反相器同时接收来自脉宽发生器的频率信号，并且利用所述延迟器和反相器分别产生相互反相的第一驱动信号和第二驱动信号。
  13. 如权利要求11所述的方法，其特征在于，所述第一驱动信号和第二驱动信号的频率大于12Hz。
  14. 如权利要求11所述的方法，其特征在于，所述第一驱动信号和第二驱动信号的频率大于24Hz。
  15. 如权利要求11所述的方法，其特征在于，所述第一驱动信号和第二驱动信号的频率大于60Hz。
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