WO2014082327A1 - 一种led背光驱动电路、背光模组和液晶显示装置 - Google Patents

一种led背光驱动电路、背光模组和液晶显示装置 Download PDF

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Publication number
WO2014082327A1
WO2014082327A1 PCT/CN2012/086093 CN2012086093W WO2014082327A1 WO 2014082327 A1 WO2014082327 A1 WO 2014082327A1 CN 2012086093 W CN2012086093 W CN 2012086093W WO 2014082327 A1 WO2014082327 A1 WO 2014082327A1
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Prior art keywords
measuring resistor
light bar
led backlight
driving circuit
resistor
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PCT/CN2012/086093
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English (en)
French (fr)
Inventor
张华�
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深圳市华星光电技术有限公司
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Priority to US13/807,702 priority Critical patent/US20140152186A1/en
Publication of WO2014082327A1 publication Critical patent/WO2014082327A1/zh

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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]
    • H05B45/30—Driver circuits
    • H05B45/395—Linear regulators
    • 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
    • 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 liquid crystal display, and more particularly to an LED backlight driving circuit, a backlight module, and a liquid crystal display device.
  • the specific method is to connect a plurality of LEDs in series into a light bar, and then connect one end of the light bar to the power module and be driven by the power module.
  • the light bar and the power module are generally connected by a common wire. The advantage is that it is easier to measure the current of the LED string, but the cost of connecting with a common wire is relatively high.
  • the technical problem to be solved by the present invention is to provide an LED backlight driving circuit, a backlight module and a liquid crystal display device which can reduce the current of the LED string at a low cost.
  • An LED backlight driving circuit includes a light bar, a power module coupled to the light bar, the light bar and the power module are connected by a flexible circuit board, and the light bar is further connected with a measuring resistor, the measuring resistor Both ends of the test lead to test points.
  • the area of the test point is larger than the area of the resistance pad.
  • the inventors have further discovered through research that the pads for measuring resistance are relatively small. When the wires are soldered, the solder joints and the solder joints formed by the wire leads soldered on the pads are likely to extend beyond the range of the pads. Adjacent pads or other components contact, resulting in a short circuit; and the area of the test point in this technical solution is larger than the area of the pad, so the solder joint does not easily exceed the range of the test point, further improving the reliability of the measurement.
  • the large test pilot reduces the difficulty of the test and the difficulty of the wire bond, and the operation is also more simple.
  • a lead wire is further extended at both ends of the measuring resistor, and the test point is disposed at one end of the lead wire away from the measuring resistor.
  • the technical solution adopts a lead wire as a transition, so that the periphery of the measuring resistor can be The narrowness is not conducive to the test point to extend the test point to a relatively open, more testable board area, and further testers test to improve the reliability of the test.
  • a spacing between the test points is greater than a spacing between pads at both ends of the measuring resistor.
  • the measuring resistor is connected in series at an output end of the light bar; the measuring resistor and the
  • a dimming controllable switch is connected in series between the grounding ends of the LED backlight driving circuit, and a constant current driving chip is connected to the control end of the dimming controllable switch. This is an LED backlight drive circuit with constant current control.
  • a sampling resistor is connected in series between the dimming controllable switch and the ground, and a voltage difference across the sampling resistor is fed back to the constant current driving chip. This is an LED backlight drive circuit with feedback constant current control function.
  • the constant current driving chip includes a comparator, and a voltage difference across the sampling resistor is fed back to a comparison end of the comparator, and an output end of the comparator is coupled to a control end of the dimming controllable switch.
  • This is a circuit structure of a specific constant current driving chip.
  • the measuring resistor is connected in series at the output end of the light bar, and the dimming controllable switch and the sampling resistor are sequentially connected in series between the measuring resistor and the grounding end of the LED backlight driving circuit; a constant current driving chip is connected to the control end of the control switch; the constant current driving chip includes a comparator, and a voltage difference across the sampling resistor is fed back to a comparison end of the comparator, and an output end of the comparator is coupled to the dimming a control end of the controllable switch; a lead wire extending from both ends of the measuring resistor, the test point being disposed at an end of the lead wire away from the measuring resistor; an area of the test point being larger than an area of the resistance pad; The pitch is greater than the spacing between the pads at the ends of the measuring resistor.
  • a backlight module includes the above LED backlight driving circuit.
  • a liquid crystal display device includes the above backlight module.
  • the invention adopts a flexible circuit board (FFC) to replace the common wire connection, thereby reducing the cost, and placing a measuring resistor in the line of each string of LEDs in the layout converter.
  • the meter measures the voltage value on the measuring resistor, and the current value of the LED string light bar can be calculated by Ohm's law.
  • the multimeter is easy to contact when measuring.
  • the LED current waveform in 3D mode is a rectangular wave, and the duty ratio cannot be measured with a multimeter. It is necessary to remove the measuring resistor with an electric soldering iron, and then solder a thin wire at both ends of the measuring resistor pad, and then use an oscilloscope.
  • the current hook meter measures the LED current waveform, and the distance between the resistance pads is very close.
  • the actual short circuit is easy to be soldered, the operation is complicated, and it is easy to waste time.
  • the invention introduces and increases the test points at both ends of the measuring resistor, so that the probe of the measuring tool such as the multimeter can reliably contact the test point, and the other components are not easily accessible, thereby improving the reliability of the measurement.
  • the thin wire can also be directly soldered to the test point. The test point avoids the pad of the measuring resistor, and the wire is not easily short-circuited, and the operation is convenient and the reliability is high.
  • FIG. 1 is a schematic diagram of a prior art LED driving principle
  • FIG. 2 is a schematic diagram of the principle of an embodiment of the present invention.
  • the present invention discloses a liquid crystal display device, which includes a backlight module, and the backlight module includes an LED backlight driving circuit, the LED backlight driving circuit includes a light bar, and a measuring resistor connected in series with the light bar. Test points are respectively disposed at two ends of the measuring resistor, and the area of the test point is larger than the area of the resistor pad.
  • the invention adds a test point at both ends of the measuring resistor, and the area of the test point is larger than the two ends of the measuring resistor, so that the probe of the measuring tool such as a multimeter can reliably contact the test point, and the other components are not easily accessible, and the lifting is improved. Reliability of measurement.
  • the inventors have further discovered through research that the pads for measuring resistance are relatively small. When the wires are soldered, the solder joints and the solder joints formed by the wire leads soldered on the pads are likely to extend beyond the range of the pads.
  • Adjacent pads or other components contact, causing a short circuit; while the area of the test point in the present invention is larger than the area of the test point, the solder joint is not easily exceeded
  • the range of test points further enhances the reliability of the measurement.
  • large test points reduce the difficulty of the test and the difficulty of the wire bond, and the operation is also more simple.
  • the embodiment discloses an LED backlight driving circuit.
  • the LED backlight driving circuit comprises a light bar, a measuring resistor R1 connected in series with the light bar, the measuring resistor R1 is connected in series at the output end of the light bar, and the dimming controllable switch is connected in series between the measuring resistor R1 and the ground end of the LED backlight driving circuit.
  • Q1, sampling resistor R2; control terminal of dimming controllable switch Q1 is connected with constant current driving chip; constant current driving chip includes comparator OP, voltage difference across sampling resistor R2 is fed back to the comparison end of comparator OP, comparator OP The output is coupled to the control terminal of the dimmable controllable switch Q1.
  • the measuring resistor R1 is provided with outwardly extending leads at both ends, and the test point (TX1, TX2) is provided at one end of the lead away from the measuring resistor R1; the area of the test point (TX1, TX2) is larger than the area of the resistive pad 1, the test point ( The spacing between TX1 and TX2) is greater than the spacing between pads 1 at both ends of the measuring resistor R1.
  • the lead wire is used as a transition, so that the test device can be extended to a relatively open and more favorable test circuit board area when the measurement resistance is narrow, which is not conducive to testing, and further testers can test and improve the reliability of the test.
  • the present invention can also directly set test points on both ends of the measuring resistor without using a lead.

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  • Led Devices (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Liquid Crystal (AREA)

Abstract

一种LED背光驱动电路，包括：灯条，与灯条耦合的电源模块，所述灯条与所述电源模块之间通过柔性电路板连接，所述灯条还串联有测量电阻（R1），所述测量电阻（R1）的两端分别设有测试点（TX1、ΤΧ2）。由于在测量电阻（R1）两端增加了测试点（ΤΧ1、ΤΧ2），这样万用表等测量工具的探头就可以跟测试点（ΤΧ1、ΤΧ2）可靠接触，也不容易接触到其他元器件，提升了测量的可靠性。在用示波器测量的时候也可以将细导线直接焊接在测试点（ΤΧ1、ΤΧ2），测试点（ΤΧ1、ΤΧ2）避开了测量电阻（R1）的焊盘，导线之间不容易短路，操作方便，可靠性高。本申请还公开了一种包括上述LED背光驱动电路的背光模组和液晶显示装置。

Description

一种 LED背光驱动电路、 背光模组和液晶显示装置
【技术领域】
本发明涉及液晶显示领域， 更具体的说， 涉及一种 LED背光驱动电路、 背 光模组和液晶显示装置。
【背景技术】
随着 LED的普及，现有的液晶显示装置已经大量采用 LED来作为背光源。 参见图 1具体是做法是将多颗 LED串联成灯条（light bar ), 然后将灯条一端连 接到电源模块， 由电源模块进行驱动。 灯条跟电源模块一般用普通线材连接， 其优点是测量 LED串的电流时比较容易， 但用普通线材连接成本较高。
【发明内容】
本发明所要解决的技术问题是提供一种能低成本， 同时方便测量 LED串电 流的 LED背光驱动电路、 背光模组和液晶显示装置。
本发明的目的是通过以下技术方案来实现的：
一种 LED背光驱动电路， 包括灯条， 与灯条耦合的电源模块， 所述灯条与 所述电源模块之间通过柔性电路板连接， 所述灯条还串联有测量电阻， 所述测 量电阻的两端分别引出有测试点。
进一步的， 所述测试点的面积大于电阻焊盘的面积。 发明人通过研究还进 一步发现， 测量电阻的焊盘由于比较小， 导线焊接上去的时候， 焊材及其焊接 在焊盘上的导线头形成的焊点很可能超出焊盘的范围， 这样容易跟邻近的焊盘 或其他元器件接触， 造成短路； 而本技术方案中测试点的面积比焊盘的面积大， 因此焊点不容易超出测试点的范围， 进一步提升测量的可靠性。 另外， 大的测 试点降低了测试的难度和焊线的难度， 操作也更筒单。
进一步的， 所述测量电阻两端还延伸有引线， 所述测试点设置在引线远离 测量电阻的一端。 本技术方案采用引线作为过渡， 这样可以在测量电阻周边空 间狭小， 不利于测试的时候将测试点延伸到比较开阔、 更利于测试的电路板区 域， 进一步方面测试人员测试， 提升测试的可靠性。
进一步的， 所述测试点之间的间距大于所述测量电阻两端焊盘之间的间距。 加大间距， 可以在焊接细导线的时候， 相邻两根细导线不容易接触， 进一步避 免细导线之间的短路。
进一步的， 所述测量电阻串联在所述灯条的输出端； 所述测量电阻和所述
LED 背光驱动电路的接地端之间串联有调光可控开关， 所述调光可控开关的控 制端连接有恒流驱动芯片。 此为一种带恒流控制功能的 LED背光驱动电路。
进一步的， 所述调光可控开关和所述接地端之间串联有采样电阻， 所述采 样电阻两端的电压差反馈回所述恒流驱动芯片。 此为一种带反馈的恒流控制功 能的 LED背光驱动电路。
进一步的， 所述恒流驱动芯片包括比较器， 所述采样电阻两端的电压差反 馈回比较器的比较端， 所述比较器的输出端耦合到所述调光可控开关的控制端。 此为一种具体的恒流驱动芯片的电路结构。
进一步的， 所述测量电阻串联在所述灯条的输出端， 所述测量电阻和所述 LED 背光驱动电路的接地端之间依次串联有调光可控开关、 采样电阻； 所述调 光可控开关的控制端连接有恒流驱动芯片； 所述恒流驱动芯片包括比较器， 所 述采样电阻两端的电压差反馈回比较器的比较端， 所述比较器的输出端耦合到 所述调光可控开关的控制端； 所述测量电阻两端还延伸有引线， 所述测试点设 置在引线远离测量电阻的一端； 所述测试点的面积大于电阻焊盘的面积； 所述 测试点之间的间距大于所述测量电阻两端焊盘之间的间距。 此为一种具体的 LED背光驱动电路
一种背光模组， 包括上述的一种 LED背光驱动电路。
一种液晶显示装置， 包括上述的一种背光模组。
本发明采用柔性电路板（FFC )替代普通线材连接， 降低了成本， 并在布局 变换（layout converter ) 时， 在每串 LED的线路中放置一颗测量电阻， 用万用 表测量出该测量电阻上的电压值， 通过欧姆定律即可计算出 LED串灯条的电流 值。 但由于电路板空间比较小， 万用表测量时容易接触不良。 另外， 3D模式下 的 LED电流波形为矩形波， 用万用表无法测量出占空比， 需要使用电烙铁将测 量电阻取下， 然后在测量电阻的焊盘两端焊接一根细导线， 再用示波器的电流 勾表测量 LED电流波形， 测量电阻焊盘之间距离很近， 实际焊接时容易出现短 路情况， 操作较复杂， 容易浪费时间。 本发明由于在测量电阻两端另引出并增 加了测试点， 这样万用表等测量工具的探头就可以跟测试点可靠接触， 也不容 易接触到其他元器件， 提升了测量的可靠性。 在用示波器测量的时候也可以将 细导线直接焊接在测试点， 测试点避开了测量电阻的焊盘， 导线之间不容易短 路， 操作方便， 可靠性高。
【附图说明】
图 1是现有技术的 LED驱动原理示意图；
图 2是本发明实施例的原理示意图。
【具体实施方式】
本发明公开了一种液晶显示装置， 该液晶显示装置包括背光模组， 背光模 组包括一种 LED背光驱动电路，该 LED背光驱动电路包括灯条，与所述灯条串 联的测量电阻， 所述测量电阻的两端分别设有测试点， 所述测试点的面积大于 电阻焊盘的面积。
本发明由于在测量电阻两端增加了测试点， 测试点的面积比测量电阻两端 的大， 这样万用表等测量工具的探头就可以跟测试点可靠接触， 也不容易接触 到其他元器件， 提升了测量的可靠性。 发明人通过研究还进一步发现， 测量电 阻的焊盘由于比较小， 导线焊接上去的时候， 焊材及其焊接在焊盘上的导线头 形成的焊点很可能超出焊盘的范围， 这样容易跟邻近的焊盘或其他元器件接触， 造成短路； 而本发明中测试点的面积比测试点的面积大， 因此焊点不容易超出 测试点的范围， 进一步提升测量的可靠性。 另外， 大的测试点降低了测试的难 度和焊线的难度， 操作也更筒单。
下面结合附图和较佳的实施例对本发明作进一步说明。
如图 2所示，本实施方式公开一种 LED背光驱动电路。该 LED背光驱动电 路包括灯条， 与灯条串联的测量电阻 R1 , 测量电阻 R1 串联在灯条的输出端， 测量电阻 R1和 LED背光驱动电路的接地端之间依次串联有调光可控开关 Q1、 采样电阻 R2; 调光可控开关 Q1的控制端连接有恒流驱动芯片； 恒流驱动芯片 包括比较器 OP, 采样电阻 R2两端的电压差反馈回比较器 OP的比较端， 比较 器 OP的输出端耦合到调光可控开关 Q1的控制端。 测量电阻 R1两端设有向外 延伸的引线，引线远离测量电阻 R1的一端设有测试点 (TX1 , TX2);测试点 (TX1 , TX2)的面积大于电阻焊盘 1的面积， 测试点 (TX1 , TX2)之间的间距大于测量电 阻 R1两端焊盘 1之间的间距。
本实施例采用引线作为过渡， 这样可以在测量电阻周边空间狭小， 不利于 测试的时候将测试点延伸到比较开阔、 更利于测试的电路板区域， 进一步方面 测试人员测试， 提升测试的可靠性。 另外， 加大测试点之间的间距， 可以在焊 接细导线的时候， 相邻两根细导线不容易接触， 进一步避免细导线之间的短路。 当然， 本发明也可以不用引线， 直接在测量电阻两端设置测试点。
以上内容是结合具体的优选实施方式对本发明所作的进一步详细说明， 不 能认定本发明的具体实施只局限于这些说明。 对于本发明所属技术领域的普通 技术人员来说， 在不脱离本发明构思的前提下， 还可以做出若干筒单推演或替 换， 都应当视为属于本发明的保护范围。

Claims

权利要求
1. 一种 LED背光驱动电路， 所述 LED背光驱动电路包括灯条， 与灯条耦 合的电源模块， 所述灯条与所述电源模块之间通过柔性电路板连接， 所述灯条 还串联有测量电阻， 所述测量电阻的两端分别引出有测试点。
2. 如权利要求 1所述的一种 LED背光驱动电路， 其中， 所述测试点的面 积大于电阻焊盘的面积。
3. 如权利要求 1所述的一种 LED背光驱动电路， 其中， 所述测量电阻两端 还延伸有引线， 所述测试点设置在引线远离测量电阻的一端。
4. 如权利要求 3所述的一种 LED背光驱动电路， 其中， 所述测试点之间的 间距大于所述测量电阻两端焊盘之间的间距。
5. 如权利要求 1所述的一种 LED背光驱动电路， 其中， 所述测量电阻串联 在所述灯条的输出端； 所述测量电阻和所述 LED背光驱动电路的接地端之间串 联有调光可控开关， 所述调光可控开关的控制端连接有恒流驱动芯片。
6. 如权利要求 5所述的一种 LED背光驱动电路， 其中， 所述调光可控开关 和所述接地端之间串联有采样电阻， 所述采样电阻两端的电压差反馈回所述恒 流驱动芯片。
7. 如权利要求 6所述的一种 LED背光驱动电路， 其中， 所述恒流驱动芯片 包括比较器， 所述采样电阻两端的电压差反馈回比较器的比较端， 所述比较器 的输出端耦合到所述调光可控开关的控制端。
8.如权利要求 1所述的一种 LED背光驱动电路， 其中， 所述测量电阻串联 在所述灯条的输出端， 所述测量电阻和所述 LED背光驱动电路的接地端之间依 次串联有调光可控开关、 采样电阻； 所述调光可控开关的控制端连接有恒流驱 动芯片； 所述恒流驱动芯片包括比较器， 所述采样电阻两端的电压差反馈回比 较器的比较端， 所述比较器的输出端耦合到所述调光可控开关的控制端； 所述 测量电阻两端还延伸有引线， 所述测试点设置在引线远离测量电阻的一端； 所 述测试点的面积大于电阻焊盘的面积； 所述测试点之间的间距大于所述测量电 阻两端焊盘之间的间距。
9. 一种背光模组， 包括一种 LED背光驱动电路， 所述 LED背光驱动电路 包括灯条， 与灯条耦合的电源模块， 所述灯条与所述电源模块之间通过柔性电 路板连接， 所述灯条还串联有测量电阻， 所述测量电阻的两端分别引出有测试 点。
10. 如权利要求 9所述的一种背光模组， 其中， 所述测试点的面积大于电 阻焊盘的面积。
11. 如权利要求 9所述的一种背光模组， 其中， 所述测量电阻两端还延伸有 引线， 所述测试点设置在引线远离测量电阻的一端。
12. 如权利要求 11所述的一种背光模组， 其中， 所述测试点之间的间距大 于所述测量电阻两端焊盘之间的间距。
13. 如权利要求 9所述的一种背光模组， 其中， 所述测量电阻串联在所述灯 条的输出端； 所述测量电阻和所述 LED背光驱动电路的接地端之间串联有调光 可控开关， 所述调光可控开关的控制端连接有恒流驱动芯片。
14. 如权利要求 13所述的一种背光模组， 其中， 所述调光可控开关和所述 接地端之间串联有采样电阻， 所述采样电阻两端的电压差反馈回所述恒流驱动 芯片。
15. 如权利要求 14所述的一种背光模组， 其中， 所述恒流驱动芯片包括比 较器， 所述采样电阻两端的电压差反馈回比较器的比较端， 所述比较器的输出 端耦合到所述调光可控开关的控制端。
16. 如权利要求 9所述的一种背光模组， 其中， 所述测量电阻串联在所述灯 条的输出端， 所述测量电阻和所述 LED背光驱动电路的接地端之间依次串联有 调光可控开关、 采样电阻； 所述调光可控开关的控制端连接有恒流驱动芯片； 所述恒流驱动芯片包括比较器， 所述采样电阻两端的电压差反馈回比较器的比 较端， 所述比较器的输出端耦合到所述调光可控开关的控制端； 所述测量电阻 两端还延伸有引线， 所述测试点设置在引线远离测量电阻的一端； 所述测试点 的面积大于电阻焊盘的面积； 所述测试点之间的间距大于所述测量电阻两端焊 盘之间的间距。
17. 一种液晶显示装置， 包括如权利要求 9所述的一种背光模组。
PCT/CN2012/086093 2012-11-30 2012-12-07 一种led背光驱动电路、背光模组和液晶显示装置 WO2014082327A1 (zh)

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