WO2012022054A1 - 交错式背光驱动的背光模块以及液晶显示器 - Google Patents

交错式背光驱动的背光模块以及液晶显示器 Download PDF

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Publication number
WO2012022054A1
WO2012022054A1 PCT/CN2010/076814 CN2010076814W WO2012022054A1 WO 2012022054 A1 WO2012022054 A1 WO 2012022054A1 CN 2010076814 W CN2010076814 W CN 2010076814W WO 2012022054 A1 WO2012022054 A1 WO 2012022054A1
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WIPO (PCT)
Prior art keywords
electrically connected
switching signal
signal
liquid crystal
converter
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PCT/CN2010/076814
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English (en)
French (fr)
Inventor
贺成明
杨景元
Original Assignee
深圳市华星光电技术有限公司
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Application filed by 深圳市华星光电技术有限公司 filed Critical 深圳市华星光电技术有限公司
Priority to EP10856052.5A priority Critical patent/EP2607948A4/en
Priority to US12/996,322 priority patent/US20120044268A1/en
Publication of WO2012022054A1 publication Critical patent/WO2012022054A1/zh

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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
    • 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
    • G09G3/3406—Control of illumination source
    • 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]
    • 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
    • G02F1/133612—Electrical details
    • 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
    • G02F1/133613—Direct backlight characterized by the sequence of light 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
    • G02F1/133628—Illuminating devices with cooling means
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/025—Reduction of instantaneous peaks of current
    • 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]
    • H05B45/38—Switched mode power supply [SMPS] using boost topology
    • 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 a backlight module and a liquid crystal display using the same, and more particularly to a backlight module and a liquid crystal display. Background technique
  • LCD monitors have gradually become widely used in various electronic devices such as mobile phones, personal digital assistants (PDAs), digital cameras, computer screens or notebook screens. High resolution color screen display.
  • the backlight module is one of the key components of the liquid crystal display panel (LCD panel). Since the liquid crystal itself does not emit light, the function of the backlight module is to supply a sufficient light source with uniform brightness and uniformity. The simple and effective optical mechanism is converted into a high-brightness and uniform luminance surface light source to provide a backlight of the liquid crystal display panel.
  • LCD panels are now widely used in electronic products with potential for growth, such as monitors, notebook computers, digital cameras and projectors, especially for large-size panels such as notebook computers and LCD monitors, and therefore for backlight modules. Growth has also grown stronger.
  • FIG. 1 illustrates driving a light emitting diode by using a conventional converter.
  • the backlight module 1 includes a power supply terminal 12, a plurality of LEDs 14, and a converter 16.
  • Converter 16 contains the inductive component! ⁇ , transistor T, diode D and a capacitor component C.
  • the transistor T switches according to the switching signal V e to output a driving signal to the LED 14.
  • LED 14 produces light depending on the voltage difference of the drive signal.
  • the conventional LED backlight module 1 uses only one converter 16 to simultaneously drive all of the LEDs 14. Since the converter 16 must output a large current to drive all of the LEDs 14 at the same time, large currents can also cause potential problems such as excessive temperatures. Excessive temperature will not only reduce the life of the LED 14, but also reduce the luminous efficiency of the LED 14. Summary of the invention
  • the present invention provides a liquid crystal display including a power supply terminal, a liquid crystal display panel, a switching signal generator, a first light emitting device, a second light emitting device, a first converter, and a second converter.
  • the power terminal is used to generate a supply voltage.
  • the liquid crystal display panel includes a liquid crystal layer for displaying an image.
  • the switch signal generator is configured to generate a first switch signal and a second switch signal.
  • the first converter is electrically connected to the power terminal, and is configured to generate the first driving signal according to the first switching signal.
  • the second converter is electrically connected to the power terminal, and is configured to generate the second driving signal according to the second switching signal.
  • the first illuminating device is configured to generate light according to a voltage difference of the first driving signal sent by the first converter.
  • the second illuminating device is used to The second driving signal from the second converter generates light.
  • the phases of the first driving signal and the second driving signal are also different by 180 degrees.
  • the present invention provides a backlight module including a power supply terminal, a switching signal generator, a first lighting device, a second lighting device, a first converter, and a second converter.
  • the power terminal is used to generate a supply voltage.
  • the switch signal generator is configured to generate a first switch signal and a second switch signal.
  • the first converter is electrically connected to the power terminal, and is configured to generate the first driving signal according to the first switching signal.
  • the second converter is electrically connected to the power terminal for generating the second driving signal according to the second switching signal.
  • the first illuminating device is configured to generate light according to a voltage difference of the first driving signal transmitted by the first converter.
  • the second illuminating device is configured to generate light according to the second driving signal transmitted from the second converter.
  • the phase of the first driving signal and the second driving signal are also different by 180 degrees.
  • the first illumination device comprises a light emitting diode or a plurality of light emitting diodes connected in series.
  • the second illuminating device comprises a light emitting diode or a plurality of light emitting diodes connected in series.
  • the first converter comprises a capacitor component, an inductor component, a diode and a first transistor.
  • the capacitor assembly is connected in parallel to the first light emitting device; the first end of the inductor component is electrically connected to the first pole of the power source; the diode is electrically connected to the second end of the inductor component and the first The first end of the first transistor is electrically connected between the inductor component and the diode, and the second end of the first transistor is electrically connected to the second pole of the power source.
  • the second converter comprises a capacitor component, an inductor component, a diode and a second transistor.
  • the first component of the inductive component is electrically connected to the first end of the power supply terminal; the diode is electrically connected to the second end of the inductive component.
  • the first end of the second transistor is electrically connected between the inductive component and the diode, and the second end of the first transistor is electrically connected to the second pole of the power source.
  • the first transistor and the second transistor have opposite turn-on voltages and are connected to the same turn-on signal.
  • the backlight module further includes an inverter for inverting a switching signal of the switching signal generator to generate another switching signal, and the two switching signals are respectively used as the second switching signal.
  • the backlight module and the liquid crystal display of the present invention drive the LEDs in an interleaved control manner.
  • the duty cycle is set to 50% under the same switching period, the LEDs of the same arrangement direction (strmg) will be Half of the duty cycle is turned off, and since the switching frequency is above 100 kHz, the human eye cannot find its brightness change. Because the LED will be turned off for half or even longer in the same switching cycle, it will effectively reduce the temperature caused by the LED being illuminated at the same time, and effectively reduce the LED during the lighting process. The problem of heat is generated.
  • Figure 1 illustrates the use of a conventional converter to drive a light emitting diode.
  • FIG. 2 is a schematic view of a liquid crystal display according to a first embodiment of the present invention.
  • Figure 3 is a schematic view of a liquid crystal display according to a second embodiment of the present invention.
  • FIG. 2 is a schematic diagram of a liquid crystal display device 20 according to a first embodiment of the present invention.
  • the liquid crystal display 20 includes a power supply terminal 21, a liquid crystal display panel 30, and a backlight module 10.
  • the backlight module 10 generates light required for the liquid crystal display panel 30 using the voltage supplied from the power supply terminal 21.
  • the backlight module 10 includes a first light emitting device 22, a second light emitting device 24, a switching signal generator 25, a first converter 26, and a second converter 28.
  • the power terminal 21 is used to provide a DC supply voltage V DC .
  • the liquid crystal display panel 30 includes a liquid crystal layer for displaying an image.
  • the first illuminating device 22 and the second illuminating device 24 comprise a single light emitting diode 32 or a plurality of light emitting diodes 32 connected in series.
  • One end of the first illuminating device 22 is electrically connected to the first converter 26, and the other end is electrically connected to a voltage terminal (the grounding end in FIG. 2 is used according to the first driving signal sent by the first converter 26).
  • the voltage difference generates a light.
  • One end of the second light-emitting device 24 is electrically connected to the second converter 28, and the other end is electrically connected to the voltage terminal (the ground terminal in FIG. 2 is used to send according to the second converter 28).
  • the voltage difference of the second drive signal generates light.
  • the switch signal generator 25 is used to generate the switching signal V.
  • the first converter 26 and the second converter 28 are for converting the direct current voltage (UV) of the power supply terminal 21 into an alternating current high voltage.
  • the first converter 26 includes a capacitor assembly 40, an inductor assembly 42, a diode 44, and a first transistor 46.
  • the capacitor assembly 40 is connected in parallel to the first illumination device 22.
  • the first end of the inductor component 42 is electrically connected to the first pole of the power terminal 21.
  • the diode 44 is electrically connected between the second end of the inductor component 42 and the first illuminating device 22.
  • the inductor component 42 is an energy storage component for storing the DC voltage supplied from the power terminal 21.
  • the first end of the first transistor 46 is electrically connected to the inductor component 42 and the diode 44, and the second end of the first transistor 46 is electrically connected to the second pole of the power terminal 21.
  • the first transistor 46 is an N-type Metal-Oxide-Semiconductor (MOS) transistor whose gate is connected to the first switching signal V ei of the square wave output.
  • MOS Metal-Oxide-Semiconductor
  • the first illuminating device 22 emits light due to the voltage difference of the first driving signal.
  • the capacitor assembly 40 is also charged due to the voltage difference of the first driving signal.
  • the first switching signal V ei is at a high level, the first transistor 46 is turned on, and the diode 44 is in a reverse bias state and is not turned on. Therefore, the first driving signal is not transmitted to the first lighting device 22 at this time, so the first lighting device 22 cannot generate light due to the voltage difference of the first driving signal.
  • the second converter 28 includes a capacitor assembly 50, an inductor assembly 52, a diode 54 and a second transistor 56.
  • the capacitor assembly 50 is connected in parallel to the second illumination device 24.
  • the first end of the inductor component 52 is electrically connected to the power terminal 21 .
  • the diode 54 is electrically connected between the second end of the inductor component 52 and the second illuminating device 24.
  • the inductive component 52 is an energy storage component for storing the DC voltage supplied from the power terminal 21.
  • the first end of the second transistor 56 is electrically connected to the inductor component 52 and the diode 54 , and the second end of the second transistor 56 is electrically connected to the second pole of the power terminal 21 .
  • the second transistor 56 is an N-type metal-oxide-semiconductor (NMOS) transistor, and the gate of the NMOS transistor is connected to the second switching signal V e2 of the square wave output.
  • NMOS N-type metal-oxide-semiconductor
  • the inverter 58 inverts the first switching signal V ei to form the second switching signal V G2 , the phase of the first switching signal V e ⁇ n the second switching signal V e2 is 180 degrees out of phase, so The first switching signal V ei is at a low level and the second switching signal V e2 is at a high level.
  • the second transistor 56 When the second switching signal ⁇ is at a low level, the second transistor 56 is turned off to cause the power terminal 21, the inductor component 52, the diode 54 and the second illuminating device 24 to form a current loop, and the second illuminating device 24 receives the current.
  • the second drive signal i.e., the level at the output of diode 54.
  • the second illuminating device 24 emits light due to the voltage difference of the second driving signal, and the capacitor assembly 50 is also charged due to the voltage difference of the second driving signal.
  • the second switching signal ⁇ When the second switching signal ⁇ is at a high level, the second transistor 56 is turned on, and the diode 54 is not turned on due to the reverse bias, so the second driving signal is not transmitted to the second at this time.
  • the light-emitting device 24 is such that the second light-emitting device 24 cannot generate light due to the voltage difference of the second drive signal. Since the phase of the first switching signal V e ⁇ n a second switching signal V e2 is 180 degrees, the first joint so that the phase of the second driving signal and a driving signal is also 180 degrees. As a result, the time during which the first light-emitting device 22 and the second light-emitting device 24 emit light due to the driving of the first driving signal and the second driving signal are staggered. That is, at any point in time, only one of the first illuminating device 22 or the second illuminating device 24 will illuminate.
  • FIG. 3 is a schematic diagram of a liquid crystal display 60 according to a second embodiment of the present invention.
  • the liquid crystal display 60 includes a power supply terminal 21, a liquid crystal display panel 30, and a backlight module 70.
  • the same functions as those of the components shown in FIG. 2 have the same functions, and their operation will not be described below.
  • the difference from the embodiment of FIG. 2 is that the second transistor 66 of the second converter 28 is changed to a PMOS transistor and its gate is also controlled by the first switching signal V ei , and the inverter 58 is not required.
  • the PMOS transistor Since the PMOS transistor is turned on when the first switching signal V ei is at a low level, it is turned off at a high level, just opposite to the NMOS transistor. That is, even if the first transistor 46 and the second transistor 66 are controlled by the same first switching signal V ei , the component characteristics of the second transistor 66 PMOS transistor :) and the first transistor 46 NMOS transistor :) are just right. On the contrary, when the second illuminating device 24 receives the second driving signal (that is, the level of the output end of the diode 54) and emits light, the first illuminating device 22 does not receive the first driving signal and does not emit light. vice versa.
  • the second driving signal that is, the level of the output end of the diode 54
  • the time during which the first illumination device 22 and the second illumination device 24 emit light due to the driving of the first driving signal are staggered. That is, at any one time point, only one of the first illuminating device 22 or the second illuminating device 24 will emit light.
  • the first issue in the present invention can be realized by driving only the same switch signal.
  • the optical device 22 and the second illuminating device 24 are interleaved with a target of light emission due to driving of a driving signal; it is not necessary to fix the first transistor 46 and the second transistor 66 as NMOS transistors or PMOS transistors as described above.
  • the duty ratios of the first switch signal and the second switch signal are both 50%.
  • the duty ratio of the first switch signal and the second switch signal can also be adjusted to 60% as needed: 40 % or other ratio, and the duty ratios of the first drive signal and the second drive signal will also be adjusted along with the duty cycle of the first switch signal and the second switch signal.
  • the backlight module of the present invention and the liquid crystal display using the backlight module drive the first light-emitting device and the second light-emitting device in an interleaved manner, so that the first switch signal and the second switch signal are in the same switching cycle.
  • the duty ratio is 50%
  • the first illuminating device and the second illuminating device each have a half duty cycle in a closed state. Since the first illuminating device and the second illuminating device will be in a closed state for half of the time in the same switching cycle, the problem of excessive temperature caused by simultaneous lighting of all the illuminating devices will also be effectively improved, thereby effectively reducing the illuminating device. The heat generated during the lighting process.

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • Mathematical Physics (AREA)
  • Computer Hardware Design (AREA)
  • Theoretical Computer Science (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Liquid Crystal (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

摘要本发明公开一种背光模块和液晶显示器，其以一交错式之控制方法驱动发光二极管。利用二转换器以交错方式分别驱动两组发光二极管，使得在同一切换周期下，两组发光二极管会轮流开启，所以各会有一半的工作周期处于关闭状态。因每一组发光二极管在同一切换周期下将有一半的时间为关闭状态，因此也将有效降地因所有发光二极管同时点亮所产生之温度过高问题。以有效降低发光二极管在点灯过程中产生热的问题。

Description

交错式背光驱动的背光模块以及液晶显示器 技术领域
本发明涉及一种背光模块以及应用所述背光模块的液晶显示器， 尤指一 种交错驱动发光装置的背光模块以及液晶显示器。 背景技术
功能先进的显示器渐成为现今消费电子产品的重要特色， 其中液晶显示 器已经逐渐成为各种电子设备如行动电话、 个人数字助理 (PDA：)、 数字相机、 计算机屏幕或笔记型计算机屏幕所广泛应用具有高分辨率彩色屏幕的显示 器。
背光模块 (Back light module)为液晶显示器面板 (Liquid crystal display panel, LCD panel)的关键零组件之一， 由于液晶本身不发光， 背光模块之功能 即在于供应充足的亮度与分布均匀的光源， 透过简洁有效光机构转化成高亮 度且均一辉度的面光源， 以提供液晶显示器面板背光光源。 液晶显示器面板 现已广泛应用于监视器、 笔记本计算机、 数字相机及投影机等具成长潜力之 电子产品， 尤以笔记型计算机及 LCD监视器等大尺寸用面板需求最大， 也因 此对于背光模块需求成长也日趋强烈。
目前背光模块所使用的发光源除了冷阴极荧光灯管之外， 发光二极管 (Light emitting diode, LED)由于因无汞而具有环保及响应速度快等优点， 近 几年来已成为 LCD电视背光灯源之主流。但是发光二极管相关物理特性也影 响其发光效率及寿命， 其中又以温度影响最大， 因此各种散热材料及技术便 开始运用于 LED背光，无疑都是希望透过各种散热技术可以有效降低因温度 问题对 LED造成之影响。 请参阅图 1， 图 1绘示利用传统转换器驱动发光二 极管。 背光模块 1包含电源端 12、 若干个 LED 14以及转换器 16。 转换器 16 则包含电感组件！^、 晶体管 T、 二极管 D及一电容组件 C。 电源端 12产生直 流供应电压 VDC予转换器 16后， 晶体管 T会依据开关信号 Ve而切换以输出 驱动信号予 LED 14。 LED 14则是依驱动信号的电压差产生光线。 然而， 传 统 LED背光模块 1仅用一转换器 16来同时驱动所有 LED 14。因为转换器 16 必须输出大电流才能同时驱动所有的 LED 14，所以大电流也会产生温度过高 等潜在问题。 过高的温度不但会降低 LED 14的寿命， 也会使 LED 14发光效 率降低。 发明内容
因此本发明的目的是提供一种背光模块以及应用所述背光模块的液晶 显示器， 利用交错驱动发光装置的方式以减少产生的热能。
本发明提供一种液晶显示器， 其包含电源端、 液晶显示面板、 开关信号 产生器、 第一发光装置、 第二发光装置、 第一转换器以及第二转换器。 所述 电源端用来产生供应电压。所述液晶显示面板包含一液晶层， 用来显示影像。 所述开关信号产生器用来产生第一开关信号和第二开关信号。 所述第一转换 器电性连接于所述电源端， 用来将所述供应电压依据第一开关信号产生第一 驱动信号。 所述第二转换器电性连接于所述电源端， 用来将所述供应电压依 据第二开关信号产生第二驱动信号。 所述第一发光装置用来依据所述第一转 换器传来的所述第一驱动信号的电压差产生光线。 所述第二发光装置用来依 据所述第二转换器传来的所述第二驱动信号产生光线。 所述第一驱动信号与 所述第二驱动信号的相位亦相差 180度。
本发明提供一种背光模块， 其包含电源端、 开关信号产生器、 第一发光 装置、 第二发光装置、 第一转换器以及第二转换器。 所述电源端用来产生供 应电压。 所述开关信号产生器用来产生第一开关信号和第二开关信号。 所述 第一转换器电性连接于所述电源端， 用来将所述供应电压依据第一开关信号 产生第一驱动信号。 所述第二转换器电性连接于所述电源端， 用来将所述供 应电压依据第二开关信号产生第二驱动信号。 所述第一发光装置用来依据所 述第一转换器传来的所述第一驱动信号的电压差产生光线。 所述第二发光装 置用来依据所述第二转换器传来的所述第二驱动信号产生光线。 所述第一驱 动信号与所述第二驱动信号的相位亦相差 180度。
依据本发明， 所述第一发光装置包含一发光二极管或是若干个串联的发 光二极管。 所述第二发光装置包含一发光二极管或是若干个串联的发光二极 依据本发明， 所述第一转换器包含电容组件、 电感组件、 二极管及第一 晶体管。 所述电容组件并联于所述第一发光装置； 所述电感组件第一端电性 连接于所述电源第一极； 所述二极管电性连接于所述电感组件第二端和所述 第一发光装置之间； 所述第一晶体管第一端电性连接于所述电感组件和所述 二极管之间， 所述第一晶体管第二端电性连接于所述电源第二极。
依据本发明， 所述第二转换器包含电容组件、 电感组件、 二极管及第二 晶体管。 所述电容组件并联于所述第二发光装置； 所述电感组件第一端电性 连接于所述电源端第一极； 所述二极管电性连接于所述电感组件第二端和所 述第二发光装置之间； 所述第二晶体管第一端电性连接于所述电感组件和所 述二极管之间， 所述第一晶体管第二端电性连接于所述电源第二极。 依据本发明， 所述第一晶体管与第二晶体管的开启电压极性相反， 并连 接到同一开启信号。 依据本发明， 所述背光模块另包含一反相器， 用来反相所述开关信号产 生器的一开关信号以产生另一路开关信号， 两路开关信号分别作为所述第二 开关信号。
相较于先前技术， 本发明的背光模块和液晶显示器以一交错式的控制方 法驱动发光二极管， 在同一切换周期下， 若工作周期设置为 50%， 则同一排 列方向 (strmg)的发光二极管将会有一半的工作周期处于关闭状态， 且因切换 频率皆为百 KHz以上， 因此人眼并无法发现其亮度变化。 而因 LED在同一 切换周期下将有一半甚至更长的时间为关闭状态， 因此也将有效降地因发光 二极管同时点亮所产生的温度过高问题， 以及有效降低发光二极管在点灯过 程中所产生热的问题。 为让本发明的上述内容能更明显易懂， 下文特举较佳实施例， 并配合所 附图式， 作详细说明如下：
附图说明 图 1绘示利用传统转换器驱动发光二极管。
图 2是本发明第一实施例的液晶显示器的示意图。
图 3是本发明第二实施例的液晶显示器的示意图。
具体实施方式 请参阅图 2， 图 2是本发明第一实施例的液晶显示器 20的示意图。 液晶 显示器 20包含电源端 21、 液晶显示面板 30及背光模块 10。 背光模块 10利 用电源端 21提供的电压产生液晶显示面板 30所需的光线。背光模块 10包含 第一发光装置 22、 第二发光装置 24、 开关信号产生器 25、 第一转换器 26以 及第二转换器 28。 电源端 21用来提供直流供应电压 VDC。 液晶显示面板 30 包含一液晶层， 用来显示影像。 第一发光装置 22和第二发光装置 24包含单 一发光二极管 32或是若干个串联的发光二极管 32。 第一发光装置 22的一端 电性连接于第一转换器 26， 另一端电性连接于一电压端 (在图 2中是接地端 用来依据第一转换器 26所送出的第一驱动信号的电压差产生光线。第二发光 装置 24的一端电性连接于第二转换器 28， 另一端电性连接于所述电压端 (在 图 2中是接地端 用来依据第二转换器 28所送出的第二驱动信号的电压差 产生光线。 开关信号产生器 25用来产生开关信号 V 。
请继续参阅图 2。 第一转换器 26以及第二转换器 28是用来将电源端 21 的直流电压 (UV)转换成交流高压电压。 第一转换器 26包含电容组件 40、 电 感组件 42、 二极管 44和第一晶体管 46。 电容组件 40并联于第一发光装置 22。 电感组件 42第一端电性连接于电源端 21的第一极。二极管 44电性连接 于电感组件 42第二端和第一发光装置 22之间。 电感组件 42是储能组件， 用 来储存电源端 21提供的直流电压。 第一晶体管 46第一端电性连接于电感组 件 42和二极管 44， 其第二端电性连接电源端 21的第二极。 在本实施例中， 第一晶体管 46是 N型金属-氧化物-半导体 (Metal-Oxide-Semiconductor, MOS) 晶体管，其栅极连接方波输出的第一开关信号 Vei。当第一开关信号 Vei处于 低电平时， 第一晶体管 46会关闭使得电源端 21、 电感组件 42、 二极管 44、 和第一发光装置 22形成一电流回路， 此时第一发光装置 22会接收到第一驱 动信号 (也就是二极管 44输出端的电平 第一发光装置 22因为第一驱动信号 的电压差而发出光线， 而电容组件 40也因为第一驱动信号的电压差而充电。 当第一开关信号 Vei处于高电平时， 第一晶体管 46会开启， 此时二极管 44 是反向偏压状态而不导通， 所以第一驱动信号此时是没有传送到第一发光装 置 22， 故第一发光装置 22因没有第一驱动信号的电压差而无法产生光线。
同样地， 第二转换器 28包含电容组件 50、 电感组件 52、 二极管 54和第 二晶体管 56。 电容组件 50并联于第二发光装置 24。 电感组件 52第一端电性 连接于电源端 21。 二极管 54电性连接于电感组件 52第二端和第二发光装置 24之间。 电感组件 52是储能组件， 用来储存电源端 21提供的直流电压。 第 二晶体管 56第一端电性连接于电感组件 52和二极管 54， 其第二端电性连接 电源端 21的第二极。在本发明实施例中， 第二晶体管 56是 N型金属-氧化物 -半导体 (NMOS)晶体管， NMOS 晶体管的栅极连接方波输出的第二开关信号 Ve2。 请注意， 因为反相器 58是反相第一开关信号 Vei以形成第二开关信号 VG2, 所以第一开关信号 Ve^n第二开关信号 Ve2的相位是相差 180度， 所以 当第一开关信号 Vei是低电平则第二开关信号 Ve2是高电平。 当第二开关信 号 ∞处于低电平时， 第二晶体管 56会关闭启使得电源端 21、 电感组件 52、 二极管 54和第二发光装置 24形成一电流回路，此时第二发光装置 24会接收 到第二驱动信号 (也就是二极管 54输出端的电平)。第二发光装置 24因为第二 驱动信号的电压差而发出光线，而电容组件 50也因为第二驱动信号的电压差 而充电。 当第二开关信号 ∞处于高电平时， 第二晶体管 56会开启， 此时二 极管 54会因为反向偏压而不导通，所以第二驱动信号此时是没有传送到第二 发光装置 24， 故第二发光装置 24因没有第二驱动信号的电压差而无法产生 光线。 由于第一开关信号 Ve^n第二开关信号 Ve2的相位是相差 180度， 连 带使得第一驱动信号以及第二驱动信号的相位也相差 180度。 如此一来， 第 一发光装置 22与第二发光装置 24因第一驱动信号以及第二驱动信号的驱动 而发光的时间是交错的。 也就是说， 在任一时点， 只有第一发光装置 22或第 二发光装置 24其中之一会发光。
请参阅图 3， 图 3是本发明第二实施例的液晶显示器 60的示意图。 液晶 显示器 60包含电源端 21、 液晶显示面板 30及背光模块 70。 为简化说明， 在 图 3中凡是与图 2所示的组件具有相同编号者具有相同的功能， 以下不再赘 述它们的运作。与图 2的实施例不同的地方在于， 第二转换器 28的第二晶体 管 66改为 PMOS晶体管且其栅极亦受第一开关信号 Vei控制，而且不需使用 反相器 58。 因为 PMOS晶体管是在第一开关信号 Vei处于低电平时开启， 处 于高电平时关闭， 正好与 NMOS晶体管相反。也就是说， 即使第一晶体管 46 及第二晶体管 66都是由同样的第一开关信号 Vei所控制，但是第二晶体管 66 PMOS晶体管:)和第一晶体管 46 NMOS晶体管:)的组件特性正好相反， 所以 当第二发光装置 24接收到第二驱动信号 (也就是二极管 54输出端的电平)而发 出光线时， 第一发光装置 22不会接收到第一驱动信号而不会发出光线时， 反 之亦然。 如此一来， 第一发光装置 22与第二发光装置 24因第一驱动信号的 驱动而发光的时间是交错的。 也就是说， 在任一时点， 只有第一发光装置 22 或第二发光装置 24其中之一会发光。
本领域的技术人员可以理解， 只要第一晶体管 46和第二晶体管 66的开 启电压极性相反， 就可以只用同一开关信号驱动便能实现本发明中的第一发 光装置 22与第二发光装置 24因一驱动信号的驱动而交错时间发光的目标； 并不必须如上所述将第一晶体管 46和第二晶体管 66固定设为 NMOS晶体管 或 PMOS晶体管。
在以上实施例中， 第一开关信号与第二开关信号的占空比皆为 50%， 实 际上， 第一开关信号与第二开关信号的占空比也可以视需要调整为 60%:40% 或其它比例， 而第一驱动信号和第二驱动信号的占空比也将随第一开关信号 与第二开关信号的占空比一起调整。
综合以上， 所以本发明的背光模块和应用背光模块的液晶显示器是以交 错轮流的方式驱动第一发光装置和第二发光装置， 因此在同一切换周期下， 当第一开关信号与第二开关信号的占空比皆为 50%时， 第一发光装置和第二 发光装置各会有一半的工作周期处于关闭状态。 由于第一发光装置和第二发 光装置在同一切换周期下将有一半的时间为关闭状态， 因此也将有效改善因 所有发光装置同时点亮所产生的温度过高问题， 以有效降低发光装置在点灯 过程中产生的热能。
综上所述， 虽然本发明已以较佳实施例揭露如上， 但该较佳实施例并非 用以限制本发明， 该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

权 利 要 求
1. 一种液晶显示器， 其包含： 一电源端， 用来产生一供应电压； 及一液晶 显示面板， 包含一液晶层， 用来显示影像； 其特征在于： 所述液晶显示 器另包含：
一开关信号产生器， 用来产生第一开关信号和第二开关信号；
一第一转换器， 电性连接于所述电源端，用来将所述供应电压依据所述 第一开关信号产生第一驱动信号；
一第二转换器， 电性连接于所述电源端，用来将所述供应电压依据所述 第二开关信号产生第二驱动信号；
一第一发光装置，用来依据所述第一转换器传来的所述第一驱动信号的 电压差产生光线； 及
一第二发光装置，用来依据所述第二转换器传来的所述第二驱动信号产 生光线，
其中所述第一驱动信号与所述第二驱动信号的相位相差 180度。
2. 根据权利要求 1所述的液晶显示器， 其特征在于： 所述第一发光装置以 及所述第二发光装置包含一发光二极管或是若干个串联的发光二极管。
3. 根据权利要求 1所述的液晶显示器，其特征在于：所述第一转换器包含： 一电容组件， 并联于所述第一发光装置；
一电感组件， 其第一端电性连接于所述电源端的第一极；
一个二极管， 电性连接于所述电感组件的第二端和所述第一发光装置之 间； 及 一第一晶体管， 其第一端电性连接于所述电感组件和所述二极管之间， 其第二端连接电源端的第二极， 用来接收所述第一开关信号时导通。
4. 根据权利要求 1所述的液晶显示器，其特征在于：所述第二转换器包含： 一电容组件， 并联于所述第二发光装置；
一电感组件， 其第一端电性连接于所述电源端的第一极；
一个二极管， 电性连接于所述电感组件的第二端和所述第二发光装置之 间； 及
一第二晶体管， 其第一端电性连接于所述电感组件和所述二极管之间， 其第二端连接电源端的第二极， 用来接收所述第二开关信号时导通。
5. 根据权利要求 4所述的液晶显示器， 其特征在于： 所述液晶显示器另包 含一反相器， 用来反相所述开关信号产生器产生的一开关信号以产生另 一路开关信号， 两路开关信号分别作为所述第一开关信号和第二开关信 号。
6. 根据权利要求 4所述的液晶显示器， 其特征在于： 所述第一晶极管和第 二晶极管的开启电压极性相反， 并连接到同一开关信号。
7. 一种背光模块， 其包含： 一电源端， 用来产生一供应电压； 其特征在于: 所述背光模块另包含：
一开关信号产生器， 用来产生第一开关信号和第二开关信号；
一第一转换器， 电性连接于所述电源端，用来将所述供应电压依据第一 开关信号产生第一驱动信号；
一第二转换器， 电性连接于所述电源端，用来将所述供应电压依据第二 开关信号产生第二驱动信号； 一第一发光装置，用来依据所述第一转换器传来的所述第一驱动信号的 电压差产生光线； 及
一第二发光装置，用来依据所述第二转换器传来的所述第二驱动信号产 生光线，
其中所述第一驱动信号与所述第二驱动信号的相位相差 180度。
8. 根据权利要求 7所述的背光模块， 其特征在于： 所述第一发光装置及所 述第二发光装置包含一发光二极管或是若干个串联的发光二极管。
9. 根据权利要求 7所述的背光模块， 其特征在于： 所述第一转换器包含： 一电容组件， 并联于所述第一发光装置；
一电感组件， 其第一端电性连接于所述电源端的第一极；
一个二极管， 电性连接于所述电感组件的第二端和所述第一发光装置之 间； 及
一第一晶体管， 其第一端电性连接于所述电感组件和所述二极管之间， 其第二端连接所述电源端的第二极， 用来接收所述第一开关信号时导 通。
10.根据权利要求 7所述的背光模块， 其特征在于： 所述第二转换器包含： 一电容组件， 并联于所述第二发光装置；
一电感组件， 其第一端电性连接于所述电源端的第一极；
一个二极管， 电性连接于所述电感组件的第二端和所述第二发光装置之 间； 及
一第二晶体管， 其第一端电性连接于所述电感组件和所述二极管之间， 其第二端连接所述电源端的第二极， 用来接收所述第二开关信号时导 通。
根据权利要求 10所述的背光模块，其特征在于：所述背光模块另包含一 反相器， 用来反相所述开关信号产生器产生的一开关信号以产生另一路 开关信号， 两路开关信号分别作为所述第一开关信号和所述第二开关信 号。
根据权利要求 10所述的背光模块，其特征在于：所述第一晶极管和第二 晶极管的开启电压极性相反， 并连接到同一开启信号。
PCT/CN2010/076814 2010-08-17 2010-09-10 交错式背光驱动的背光模块以及液晶显示器 WO2012022054A1 (zh)

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Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102222470B (zh) * 2011-06-08 2013-03-13 深圳市华星光电技术有限公司 发光二极管的驱动电路及其应用的背光模块与显示装置
US8866404B2 (en) * 2011-06-08 2014-10-21 Shenzhen China Star Optoelectronics Technology Co., Ltd. Backlight module and display apparatus
US8698410B2 (en) 2011-07-01 2014-04-15 Shenzhen China Star Optoelectronics Technology Co., Ltd. LED backlight driving circuit
CN102290030A (zh) 2011-07-01 2011-12-21 深圳市华星光电技术有限公司 Led背光驱动电路
TWI440401B (zh) * 2011-11-04 2014-06-01 Au Optronics Corp 具交錯驅動機制之光源系統
KR20140013706A (ko) * 2012-07-26 2014-02-05 삼성디스플레이 주식회사 전원생성부의 구동방법과 이를 이용한 유기전계발광 표시장치
CN102982773A (zh) * 2012-12-28 2013-03-20 杨伟 Led电视机
CN103152935B (zh) * 2013-02-25 2016-02-17 颜惠平 Led灯饰控制器、led灯饰和led灯饰的驱动方法
US9196202B2 (en) * 2013-03-29 2015-11-24 Shenzhen China Star Optoelectronics Technology Co., Ltd. LED backlight driving circuit, LCD device, and method for driving the LED backlight driving circuit
CN103745691B (zh) * 2013-11-29 2015-12-02 深圳市华星光电技术有限公司 背光驱动电路以及液晶显示装置
CN103824547A (zh) * 2014-02-27 2014-05-28 深圳市华星光电技术有限公司 一种液晶显示装置的背光源及其驱动电路
CN109427305A (zh) * 2017-09-05 2019-03-05 京东方科技集团股份有限公司 控制电路、显示装置及用于向显示装置中的光源供电的方法
CN111273483A (zh) * 2020-02-15 2020-06-12 苏州视达讯远电子科技有限公司 高寿命lcd屏背光机构及其工作方法
CN112461510B (zh) * 2020-11-09 2022-10-11 深圳市给力光电有限公司 液晶显示屏背光模组质量检测装置
CN113218622B (zh) * 2021-02-06 2023-03-07 安徽赛迈特光电股份有限公司 一种显示器量子点背光模组检测装置及方法
CN114255710A (zh) * 2021-11-12 2022-03-29 安徽四季电子科技有限公司 一种多光源系统的背光切换处理方法、装置和背光系统
CN114242017B (zh) * 2021-12-23 2023-08-01 惠州视维新技术有限公司 一种显示面板及其驱动方法、显示装置

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020003517A1 (en) * 2000-04-28 2002-01-10 Shouzou Ashizawa Device and method for driving EL device
US20030038770A1 (en) * 2001-08-24 2003-02-27 Samsung Electronics Co., Ltd. Liquid crystal display and method for driving the same
CN101038398A (zh) * 2006-03-15 2007-09-19 Lg.菲利浦Lcd株式会社 显示器件的背光单元及其驱动电路
KR20080050874A (ko) * 2006-12-04 2008-06-10 엘지디스플레이 주식회사 액정표시장치 및 그의 구동 방법
US20080136352A1 (en) * 2006-12-11 2008-06-12 Sang Won Paeng Apparatus for driving a light source and liquid crystal display device using the same
CN101586751A (zh) * 2009-04-10 2009-11-25 深圳华映显示科技有限公司 一种光源系统

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7872431B2 (en) * 2002-11-20 2011-01-18 Gigno Technology Co., Ltd. Digital controlled multi-light driving apparatus
US7449838B2 (en) * 2003-09-12 2008-11-11 Matsushita Electric Industrial Co., Ltd. Backlight device and display unit provided with it
KR101087349B1 (ko) * 2004-04-28 2011-11-25 엘지디스플레이 주식회사 액정표시장치의 램프 구동장치 및 방법
KR100765268B1 (ko) * 2005-09-12 2007-10-09 삼성전자주식회사 디스플레이장치 및 그 제어방법
JP2007279093A (ja) * 2006-04-03 2007-10-25 Epson Imaging Devices Corp 液晶表示装置
KR20070109532A (ko) * 2006-05-11 2007-11-15 삼성전자주식회사 백라이트와 백라이트 구동 방법 및 이를 포함한액정표시장치
US7948468B2 (en) * 2007-02-23 2011-05-24 The Regents Of The University Of Colorado Systems and methods for driving multiple solid-state light sources
KR20090047061A (ko) * 2007-11-07 2009-05-12 삼성전자주식회사 백라이트 어셈블리 및 이를 갖는 표시장치
KR101461115B1 (ko) * 2007-10-31 2014-11-13 삼성디스플레이 주식회사 백라이트 장치 및 이를 갖는 액정표시장치
CN201369871Y (zh) * 2009-02-20 2009-12-23 国琏电子（上海）有限公司 背光源驱动系统及电子设备
CN201438779U (zh) * 2009-05-14 2010-04-14 国琏电子（上海）有限公司 背光源驱动系统
US8081199B2 (en) * 2009-06-26 2011-12-20 Panasonic Corporation Light emitting element drive apparatus, planar illumination apparatus, and liquid crystal display apparatus
CN102014543B (zh) * 2010-07-02 2011-12-28 凹凸电子（武汉）有限公司 驱动光源的驱动电路、方法及控制器

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020003517A1 (en) * 2000-04-28 2002-01-10 Shouzou Ashizawa Device and method for driving EL device
US20030038770A1 (en) * 2001-08-24 2003-02-27 Samsung Electronics Co., Ltd. Liquid crystal display and method for driving the same
CN101038398A (zh) * 2006-03-15 2007-09-19 Lg.菲利浦Lcd株式会社 显示器件的背光单元及其驱动电路
KR20080050874A (ko) * 2006-12-04 2008-06-10 엘지디스플레이 주식회사 액정표시장치 및 그의 구동 방법
US20080136352A1 (en) * 2006-12-11 2008-06-12 Sang Won Paeng Apparatus for driving a light source and liquid crystal display device using the same
CN101586751A (zh) * 2009-04-10 2009-11-25 深圳华映显示科技有限公司 一种光源系统

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