WO2014117417A1 - 一种led背光驱动电路及液晶显示器 - Google Patents

一种led背光驱动电路及液晶显示器 Download PDF

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Publication number
WO2014117417A1
WO2014117417A1 PCT/CN2013/071685 CN2013071685W WO2014117417A1 WO 2014117417 A1 WO2014117417 A1 WO 2014117417A1 CN 2013071685 W CN2013071685 W CN 2013071685W WO 2014117417 A1 WO2014117417 A1 WO 2014117417A1
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Prior art keywords
resistors
frequency setting
frequency
circuit
led backlight
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English (en)
French (fr)
Inventor
张华�
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TCL China Star Optoelectronics Technology Co Ltd
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Shenzhen China Star Optoelectronics Technology Co Ltd
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Priority to JP2015554011A priority Critical patent/JP2016507874A/ja
Priority to DE112013006355.7T priority patent/DE112013006355T5/de
Priority to GB1513219.4A priority patent/GB2524219B/en
Publication of WO2014117417A1 publication Critical patent/WO2014117417A1/zh
Priority to US14/761,943 priority patent/US20150342000A1/en
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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
    • H05B45/37—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
    • 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
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source

Definitions

  • the present invention relates to the field of image display, and in particular to an LED backlight driving circuit and a liquid crystal display.
  • the driving signal of the MOS tube Metal-Oxide-Side Field Effect Transistor
  • the frequency of the driving signal is determined by the RT pin (frequency setting pin).
  • the frequency of the MOS transistor driving signal is generally selected to be 100 to 200 KHz.
  • the frequency is too small, the conduction loss of the MOS transistor is large, and when the frequency is too large, the switching loss of the MOS transistor is large.
  • the temperature of the lower MOS tube will be high, and the conversion efficiency of the entire circuit will decrease.
  • only one frequency setting resistor R is set for the frequency setting pin RT.
  • the technical defects of the backlight driving circuit include:
  • the technical problem to be solved by the present invention is to provide a frequency signal that can precisely adjust the driving signal And the LED backlight driving circuit and the liquid crystal display which reduce the safety hazard after the open/short circuit of the resistor.
  • the present invention provides an LED backlight driving circuit, which includes: a driving chip and a frequency setting circuit, wherein the frequency setting circuit includes at least two sets of parallel connected resistors, one end of which is connected to the frequency setting pin RT of the driving chip The other end is grounded to adjust the frequency of the MOS transistor drive signal by changing at least one of the resistance values.
  • each set of resistors comprises at least two resistors connected in series.
  • the frequency setting circuit comprises two sets of parallel connected resistors, wherein the first set of resistors comprises R1 and R2, and R1 and R2 are connected in series; the second set of resistors comprises R3 and R4, and R3 and R4 are connected in series.
  • the invention also provides an LED backlight driving circuit, comprising: a driving chip and a frequency setting circuit, wherein the frequency setting circuit comprises two sets of parallel connected resistors, one end is connected with the frequency setting pin RT of the driving chip, and the other end is grounded,
  • the MOS transistor drive signal frequency is adjusted by changing at least one of the resistance values, wherein the first set of resistors includes R1 and R2, and R1 and R2 are connected in series; the second set of resistors includes R3 and R4, and R3 and R4 are connected in series.
  • the present invention also provides a liquid crystal display, comprising at least an LED backlight driving circuit, the LED backlight driving circuit further comprising a driving chip and a frequency setting circuit, the frequency setting circuit comprising at least two sets of parallel connected resistors, one end and a frequency setting of the driving chip
  • the pin RT is connected and the other end is grounded, and is used to adjust the frequency of the MOS tube driving signal by changing at least one resistance value in the resistor.
  • each set of resistors comprises at least two resistors connected in series.
  • the frequency setting circuit comprises two sets of parallel connected resistors, wherein the first set of resistors comprises R1 and R2, and R1 and R2 are connected in series; the second set of resistors comprises R3 and R4, and R3 and R4 are connected in series.
  • the LED backlight driving circuit and the liquid crystal display provided by the invention can obtain more and more accurate resistance values by using multiple resistors in series and parallel, so as to conveniently adjust the frequency of the MOS tube driving signal; and when any one of these resistors appears Open circuit or short circuit condition, the existence of other resistors can also ensure that the MOS tube drive signal frequency does not appear infinitely small or infinite abnormal conditions, reduce the safety hazard after open circuit or short circuit, and improve safety performance.
  • FIG. 1 is a schematic diagram of a conventional LED backlight driving circuit.
  • FIG. 2 is a schematic diagram of an LED backlight driving circuit according to an embodiment of the present invention.
  • An LED backlight driving circuit provided by Embodiment 1 of the present invention includes: a driving chip and a frequency setting circuit, wherein the frequency setting circuit includes at least two sets of parallel connected resistors, one end is connected to the frequency setting pin RT of the driving chip, and the other end is grounded.
  • the MOS tube drive signal frequency is adjusted by changing at least one of the resistance values.
  • the frequency setting circuit includes two sets of parallel resistors, wherein the first group of resistors includes R1 and R2, and R1 and R2 are connected in series; the second group of resistors includes R3 and R4, and R3 and R4 are connected in series.
  • the combination of four resistors R1 to R4 in the frequency setting circuit can obtain more accurate resistance values, so as to facilitate accurate adjustment of the MOS tube drive signal.
  • Frequency When any one of R1 to R4 has an open or short circuit condition, the presence of the other three resistors can also ensure that the MOS tube drive signal frequency does not appear infinitely small or infinite abnormal conditions, reducing the open or short circuit after the resistor is open or shorted. Security risks, improved security.
  • the equivalent resistance R of the frequency setting circuit needs to be 25/3kQ, provided that the commonly used resistor does not have 25/3kQ.
  • Such a precise resistance value as contained in the background art, will be difficult to meet the adjustment requirements of the MOS tube drive signal frequency.
  • each set of resistors includes at least two resistors, and if one of them (for example, R1) is short-circuited, since at least one other resistor (R2) is also connected in series.
  • the frequency of the MOS tube drive signal does not tend to be infinite, and it does not cause a safety hazard of MOS tube blasting due to a sharp rise in temperature.
  • the frequency setting circuit may include multiple sets of parallel connected resistors, and each set of resistors may also include more than two resistors connected in series to obtain a more accurate resistance value.
  • each set of resistors may also include more than two resistors connected in series to obtain a more accurate resistance value.
  • a second embodiment of the present invention provides a liquid crystal display including at least the LED backlight driving circuit shown in FIG. 2, the LED backlight driving circuit further includes a driving chip and a frequency setting circuit, and the frequency setting circuit includes at least two sets of parallel connected resistors, one end It is connected to the frequency setting pin RT of the driving chip, and the other end is grounded, and is used to adjust the frequency of the MOS tube driving signal by changing at least one of the resistance values.
  • each set of resistors includes at least two resistors connected in series.
  • the frequency setting circuit includes two sets of parallel resistors, wherein the first The group resistance includes R1 and R2, and R1 and R2 are connected in series; the second group of resistors includes R3 and R4, and R3 and R4 are connected in series.
  • the LED backlight driving circuit and the liquid crystal display provided by the invention can obtain more and more accurate resistance values by using multiple resistors in series and parallel, so as to conveniently adjust the frequency of the MOS tube driving signal; and when any one of these resistors appears Open circuit or short circuit condition, the existence of other resistors can also ensure that the MOS tube drive signal frequency does not appear infinitely small or infinite abnormal conditions, reduce the safety hazard after open circuit or short circuit, and improve safety performance.

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

Abstract

一种LED背光驱动电路，包括驱动芯片以及频率设置电路；其中频率设置电路包括至少两组相并联的电阻，其一端与驱动芯片的频率设置引脚RT相连，另一端接地；用于通过改变电阻中的至少一颗电阻值来调整MOS管驱动信号频率；还提供了一种应用该LED背光驱动电路的液晶显示器。

Description

一种 LED背光驱动电路及液晶显示器
本申请要求于 2013 年 1 月 29 日提交中国专利局、 申请号为 201310033417.3、 发明名称为 "一种 LED背光驱动电路及液晶显示器" 的中 国专利申请的优先权， 上述专利的全部内容通过引用结合在本申请中。 技术领域
本发明涉及图像显示领域， 尤其涉及一种 LED背光驱动电路及液晶显 示器。
背景技术
LED背光驱动电路中， MOS管（ Metal-Oxide- Semiconductor Field Effect Transistor, 金属氧化物半导体场效应管） 的驱动信号由恒流驱动芯片给出， 驱动信号的频率由 RT pin (频率设置引脚）外接的电阻值决定， 其计算公式 为： f ( KHz ) =constant/R, 即频率 f等于一个常量（此常量值由各驱动芯片 厂家自定， 不同厂家驱动芯片的此常量值不同）与电阻 R值的比值。
在 LED 背光驱动电路中， MOS 管驱动信号的频率一般选在 100〜200KHz, 当频率偏小时， MOS管的导通损耗大， 当频率偏大时， MOS 管的开关损耗大， 这两种情况下 MOS管的温度会很高， 整个电路的转换效 率下降。 如图 1所示， 现有的 LED背光驱动电路中， 频率设置引脚 RT只设 置一颗频率设置电阻 R。 该背光驱动电路存在的技术缺陷包括：
1、 单颗频率设置电阻 R只有一些比较常用的阻值， 当需要调节 MOS 管驱动频率时， 有可能遇到找不到合适阻值的电阻， 不方便调节；
2、 测试电路板的电气特性时， 需要测试每个元器件在开路（open ) /短 路（short )状态下整个电路的安全性， 当频率设置电阻 R短路后，根据公式： f ( KHz ) =constant/R, MOS管驱动信号频率趋于无穷大， MOS管上的开关 损耗会非常大， 温度急剧上升， 可能出现 MOS管炸开的安全隐患。
发明内容
本发明所要解决的技术问题在于，提供一种可以精确调节驱动信号频率 并且降低电阻开路 /短路后安全隐患的 LED背光驱动电路及液晶显示器。 为了解决上述技术问题， 本发明提供一种 LED背光驱动电路， 其中， 包括： 驱动芯片以及频率设置电路， 频率设置电路包括至少两组相并联的电 阻， 一端与驱动芯片的频率设置引脚 RT相连， 另一端接地， 用于通过改变 电阻中的至少一颗电阻值来调整 MOS管驱动信号频率。
其中， 每组电阻包括至少两颗相串联的电阻。
其中， 频率设置电路包括两组相并联的电阻， 其中第一组电阻包括 R1 和 R2, R1和 R2相串联； 第二组电阻包括 R3和 R4, R3和 R4相串联。
本发明还提供一种 LED背光驱动电路， 其中， 包括： 驱动芯片以及频 率设置电路， 频率设置电路包括两组相并联的电阻， 一端与驱动芯片的频率 设置引脚 RT相连， 另一端接地， 用于通过改变电阻中的至少一颗电阻值来 调整 MOS管驱动信号频率， 其中第一组电阻包括 R1和 R2 , R1和 R2相串 联； 第二组电阻包括 R3和 R4 , R3和 R4相串联。
本发明还提供一种液晶显示器， 其中， 至少包括 LED背光驱动电路， LED背光驱动电路进一步包括驱动芯片以及频率设置电路，频率设置电路包 括至少两组相并联的电阻， 一端与驱动芯片的频率设置引脚 RT相连， 另一 端接地， 用于通过改变电阻中的至少一颗电阻值来调整 MOS管驱动信号频 率。
其中， 每组电阻包括至少两颗相串联的电阻。
其中， 频率设置电路包括两组相并联的电阻， 其中第一组电阻包括 R1 和 R2, R1和 R2相串联； 第二组电阻包括 R3和 R4, R3和 R4相串联。
本发明所提供的 LED背光驱动电路及液晶显示器， 由于采用多颗电阻 串并联， 可以得到更多更精确的电阻值， 方便精确调节 MOS管驱动信号频 率；而且当这些电阻中任意一颗电阻出现开路或短路情况，其他电阻的存在， 也能够保证 MOS管驱动信号频率不会出现无穷小或者无穷大的异常情况， 降低了电阻开路或短路后的安全隐患， 安全性能提升。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案， 下面将对实 施例或现有技术描述中所需要使用的附图作简单地介绍， 显而易见地， 下面 描述中的附图仅仅是本发明的一些实施例， 对于本领域普通技术人员来讲， 在不付出创造性劳动的前提下， 还可以根据这些附图获得其他的附图。
图 1是现有 LED背光驱动电路示意图。
图 2是本发明实施例——种 LED背光驱动电路示意图。
具体实施方式
下面参考附图对本发明的优选实施例进行描述。
本发明实施例一提供的一种 LED 背光驱动电路包括： 驱动芯片以及频 率设置电路， 频率设置电路包括至少两组相并联的电阻， 一端与驱动芯片的 频率设置引脚 RT相连， 另一端接地， 用于通过改变这些电阻中的至少一颗 电阻值来调整 MOS管驱动信号频率。
具体请参照图 2所示， 频率设置电路包括两组相并联的电阻， 其中第一 组电阻包括 R1和 R2, R1和 R2相串联； 第二组电阻包括 R3和 R4, R3和 R4相串联。 在这种电路结构下， 频率设置电路的等效电阻 R的倒数满足： 1/R=1/(R1+R2)+1/(R3+R4)„ 如前所述， 根据公式： f ( KHz ) =constant/R, 改变 R值即可改变 MOS管驱动信号频率， 因此， 频率设置电路中 4颗电阻 R1〜R4的组合可以得到更多更精确的电阻值， 以方便精确调节 MOS管驱动 信号频率； 而当 R1〜R4中任意一颗电阻出现开路或短路情况， 其他 3颗电 阻的存在， 也能够保证 MOS管驱动信号频率不会出现无穷小或者无穷大的 异常情况， 降低了电阻开路或短路后的安全隐患， 安全性能提升。
举例来说， 假设图 2中驱动芯片的常量 constant值为 1000, MOS管驱 动信号频率需调整为 120KHz,那么频率设置电路的等效电阻 R需为 25/3kQ, 倘若常用的电阻没有 25/3kQ如此精确的电阻值， 如背景技术所载， 将很难 满足 MOS管驱动信号频率的调整需求。 但如果按照图 2所示的频率设置电 路， R1选用 10kQ, R2选用 15kQ, R3选用 10kQ, R4选用 2.5kQ, 均为常 见电阻值， 则 l/R=l/(10+15)+l/(10+2.5)=l/25+l/12.5=l/25+2/25=3/25kQ, 即 R=25/3kQ, 也就是说， 通过这种组合方式， 选用常见电阻值的电阻即可满足 特殊的阻值要求。 当需要再次调整 MOS管驱动信号频率时， 改变其至少一 颗电阻的电阻值（通过选用不同电阻值的电阻来实现）即可， 克服了现有只 设置单颗电阻在阻值选择上的局限， 非常便于调整 MOS管驱动信号频率。 另一方面， 由于图 2所示频率设置电路中， 每一组电阻都包括至少 2颗 电阻， 如果将其中一颗 （例如 R1 )短路， 则由于其至少还串联有另一颗电 阻（R2 ), MOS管驱动信号频率不会就因此趋于无穷大， 也不会导致因温度 急剧上升出现 MOS管炸开的安全隐患。
当然， 在不过分增加整个 LED背光驱动电路的复杂性基础上， 频率设 置电路可包括多组相并联的电阻，每组电阻也可包括 2颗以上相互串联的电 阻， 以获得更精确的电阻值来更灵活地调整 MOS管驱动信号频率， 其原理 与图 2所示相同， 此不再贅述。
本发明实施例二提供一种液晶显示器至少包括如图 2所示的 LED背光 驱动电路， 该 LED背光驱动电路进一步包括驱动芯片以及频率设置电路， 频率设置电路包括至少两组相并联的电阻， 一端与驱动芯片的频率设置引脚 RT相连， 另一端接地， 用于通过改变这些电阻中的至少一颗电阻值来调整 MOS管驱动信号频率。
本实施例中频率设置电路与实施例一相同， 例如其每组电阻包括至少两 颗相串联的电阻， 具体也请参照图 2所示， 频率设置电路包括两组相并联的 电阻， 其中第一组电阻包括 R1和 R2, R1和 R2相串联； 第二组电阻包括 R3和 R4, R3和 R4相串联。
本发明所提供的 LED背光驱动电路及液晶显示器， 由于采用多颗电阻 串并联， 可以得到更多更精确的电阻值， 方便精确调节 MOS管驱动信号频 率；而且当这些电阻中任意一颗电阻出现开路或短路情况，其他电阻的存在， 也能够保证 MOS管驱动信号频率不会出现无穷小或者无穷大的异常情况， 降低了电阻开路或短路后的安全隐患， 安全性能提升。
以上所揭露的仅为本发明较佳实施例而已， 当然不能以此来限定本发明 之权利范围， 因此依本发明权利要求所作的等同变化， 仍属本发明所涵盖的 范围。

Claims

权 利 要 求
1、 一种 LED背光驱动电路， 其中， 包括： 驱动芯片以及频率设置电路， 所述频率设置电路包括至少两组相并联的电阻， 一端与所述驱动芯片的频率 设置引脚 RT相连， 另一端接地， 用于通过改变所述电阻中的至少一颗电阻 值来调整 MOS管驱动信号频率。
2、 根据权利要求 1所述的 LED背光驱动电路， 其中， 所述每组电阻包 括至少两颗相串联的电阻。
3、 根据权利要求 2所述的 LED背光驱动电路， 其中， 所述频率设置电 路包括两组相并联的电阻，其中第一组电阻包括 R1和 R2, R1和 R2相串联； 第二组电阻包括 R3和 R4 , R3和 R4相串联。
4、 一种 LED背光驱动电路， 其中， 包括： 驱动芯片以及频率设置电路， 所述频率设置电路包括两组相并联的电阻， 一端与所述驱动芯片的频率设置 引脚 RT相连， 另一端接地， 用于通过改变所述电阻中的至少一颗电阻值来 调整 MOS管驱动信号频率， 其中第一组电阻包括 R1和 R2, R1和 R2相串 联； 第二组电阻包括 R3和 R4, R3和 R4相串联。
5、 一种液晶显示器， 其中， 至少包括 LED 背光驱动电路， 所述 LED 背光驱动电路进一步包括驱动芯片以及频率设置电路， 所述频率设置电路包 括至少两组相并联的电阻， 一端与所述驱动芯片的频率设置引脚 RT相连， 另一端接地， 用于通过改变所述电阻中的至少一颗电阻值来调整 MOS管驱 动信号频率。
6、 根据权利要求 5所述的液晶显示器， 其中， 所述每组电阻包括至少 两颗相串联的电阻。
7、 根据权利要求 6所述的液晶显示器， 其中， 所述频率设置电路包括 两组相并联的电阻， 其中第一组电阻包括 R1和 R2, R1和 R2相串联； 第二 组电阻包括 R3和 R4, R3和 R4相串联。
PCT/CN2013/071685 2013-01-29 2013-02-20 一种led背光驱动电路及液晶显示器 Ceased WO2014117417A1 (zh)

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