CN1243357A - 用于液晶显示的电源电路 - Google Patents

用于液晶显示的电源电路 Download PDF

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CN1243357A
CN1243357A CN99111299A CN99111299A CN1243357A CN 1243357 A CN1243357 A CN 1243357A CN 99111299 A CN99111299 A CN 99111299A CN 99111299 A CN99111299 A CN 99111299A CN 1243357 A CN1243357 A CN 1243357A
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下田贞之
向中野浩志
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Seiko Instruments Inc
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    • 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
    • G09G3/36—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 using liquid crystals
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    • G09G3/3622—Control of matrices with row and column drivers using a passive matrix
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    • 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
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    • G09G2330/02—Details of power systems and of start or stop of display operation
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    • 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
    • G09G3/36—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 using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3622—Control of matrices with row and column drivers using a passive matrix
    • G09G3/3625—Control of matrices with row and column drivers using a passive matrix using active addressing
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0003—Details of control, feedback or regulation circuits
    • H02M1/0006—Arrangements for supplying an adequate voltage to the control circuit of converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
    • H02M1/008—Plural converter units for generating at two or more independent and non-parallel outputs, e.g. systems with plural point of load switching regulators

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Abstract

通过从利用运算放大器的输入电压的开关调节器提供该运算放大器的正电源作为它的基准电压,即使假如该偏置比是变化的,该运算放大器的正电源电压与运算放大器的输出电压的比也总是恒定的,这样的效果是能用低功耗执行一液晶显示器件而与面板无关。

Description

用于液晶显示的电源电路
本发明涉及用于驱动液晶显示器件的电源电路。
作为用于驱动液晶显示器件的常规电路，一种利用如图3电路图所示的开关调节器的电源电路是熟知的。特别是使用开关调节器和变压器来得到驱动电压所必须的正负电源。
如图2所示，在利用例如多线寻址(MLA)的驱动方法的液晶显示器件中，作为公共侧驱动电压的VH，VL，和V1的电压特性曲线必须满足等式VH-V1＝V1-VL。如果该等式不被满足，就会引起拖尾和类似问题，其结果是破坏显示质量。在如图3所示的常规电源电路中，一变压器产生正负电压。无论如何，因为在破坏电源电路中很难获得该变压器的精确的绕组比，这样产生的问题是上述等式难于得到满足。
图4所示是早已提出用来解决该问题的电路。整流侧的驱动电压是通过分压电阻从VH电压中建立的。因为用于分压的电阻器的电阻值在此刻是高的，在该电压被实际提供给一液晶面板的情况下，在分压电阻和液晶面板之间需要一具有放大系数是1和利用一运算放大器的缓冲器电路。高于该运算放大器的输出电压的电压必须提供给该运算放大器的正电源端。这里，该正电源电压和该运算放大器的输出电压之间的差是该电源电路的损耗。如果该电压的差大，则相应的损耗也大，这就使得想要实现以低功耗执行一液晶显示器件是困难的。
进而也就产生了如下的问题。即，在一液晶面板中，公共电压和整流电压必须对应扫描线数改变。因此构成该缓冲器电路的运算放大器的输出电压根据液晶面板的运行而改变，为能以低功耗执行一液晶显示器件，在根据板的尺寸该正电源电压必须变化时会产生问题。
为解决上述问题，根据本发明，用于液晶的电源电路要这样构成，使得向公共侧缓冲器电路分配和输入一电压，该电压将提供给液晶面板以便在整流侧产生一偏置电压，因此公共侧分压被用作为开关调节器的基准电压，该开关调节器的输出电压被用作为该缓冲器电路的正电源电压。
图1是本发明用于液晶电源电路的一实施例的方框图；
图2是公共侧驱动电压的说明图；
图3是普通电源电路的电路图；
图4是本发明用于液晶的电源电路部分详细说明的电路图。
根据本发明，液晶的电源电路具有，用于在液晶面板公共一侧产生一电压的第一电源电路，用于分配该第一电源电路的输出电压，用于输出通过该电压分配电路分配的电压作为该液晶面板的整流侧的偏置电压的一缓冲器电路，和利用该电压分配电路分配的电压作为一基准电压的一第二电源电路，和由其中该第二电源电路提供电源这样构成的缓冲器电路。
进而，根据本发明，用于液晶的电源电路具有，用于在液晶面板的公共侧产生一电压的第一电源电路，用于分配该第一电源电路的输出电压成为输出第一和第二被分配电压的电压分配电路，用于输出由电压分配电路分配的第一和第二电压作为该液晶面板的整流子侧偏置电压的第一和第二缓冲器电路，和利用由电压分配电路分配的第一和第二电压中的一个作为基准电压的第二电源电路，和由其中的第二电源电路提供电源这样构成的第一和第二缓冲器电路。
图1是根据本发明一实施例的用于液晶的电源电路的方框图。在该方框图的结构中，一增压型开关调节器101和反向型开关调节器102具有如图4所示的相同结构。图2所示的电压VH，V1，和VL由增压型开关调节器101和反向型开关调节器102建立。该电压VH，V1和VL被用作为提供在该液晶显示器件的公共侧的电源。
增压型开关调节器101构成如图4所示，一FET105，一误差放大器106，控制电路107，基准电压108，和反馈电阻109和110。该增压斩波器型开关调节器由作为外部器件的电感器103和二极管104一起构成。还有该反向型开关调节器102由一个误差放大器114，一个控制电路115和反馈电阻116和117构成。该反向斩波器型开关调节器被由作为外部器件的一个FET111，二极管112，和电感器113一起构成。进而，该电压VH由分压电阻121，118和119分压。图2所示的电压V1由分压电阻118和119之间节点通过缓冲器电路120建立。进而该电压V1被输入到该反向型开关调节器102的V+侧的一端。
在图1中，在分压电阻121和118之间的节点电压被输入到一运算放大器构成的缓冲器电路122。它的输出电压以下称作为V2。输出电压V2和上述电压V1被用作为该液晶显示器件的整流子侧的电源。缓冲器电路120和122的正电源123被从增压型开关调节器124的输出电压Vout2提供。该增压型开关调节器124的电路结构与该增压型开关调节器101的相同，除了由从分压电阻121和118之间的接点给出的增压型开关调节器124的基准电压Vref2代替图4所示的基准电压108以外。
接着描述该电路的操作。由增压型开关调节器101产生的电压VH是由基准电压108的电压值Vref，反馈电阻109的电阻值R1，和反馈电阻110的电阻值R2通过公式(1)确定：
VH＝Vref·(R1+R2)/R2           (1)
还有，电压V1是由分压电阻121的电阻值R7，分压电阻118的电阻值R5，和分压电阻119的电阻值R6通过公式(2)确定：
V1＝VH·R6/(R5+R6+R7)          (2)
电压V1通过缓冲器120被阻抗转换，和相同的电压V1被输入到误差放大器114的+侧端。反馈电阻116的一端被连接到电压VH。这样，由反向型开关调节器102产生的电压VL通过公式(3)确定：
VL＝-(VH-V1)·R4/R3+V1        (3)
这里，R3是反馈电阻116的电阻值和R4是反馈电阻117的电阻值。如果进行的设定满足R3＝R4，该电压VL等于-VH+2V1。换言之等式VH-V1＝V1-VL能被满足。
下面，在图1中，该增压型开关调节器124的基准电压是该分压电阻121和118之间的节点的电压。相应地，电压Vref2由公式(4)表示：
Vref2＝VH·(R5+R6)/(R5+R6+R7)  (4)
进而，该增压型开关调节器124的输出Vout2，即，该运算放大器的正电源123由公式(5)表示：
V123＝Vref2·(R8+R9)/R9        (5)
这里，分压电阻125和126类似于如图4所示的分压电阻109和110，用于确定电压Vout2的反馈电阻。由于具有放大系数1的缓冲器电路122的输出电压V2等于Vref2，所以公式(5)表示如下：
V123＝V2·(R8+R9)/R9           (6)
这意味着电压V123是由(R8+R9)/R9乘以电压V2。换言之根据本发明，该运算放大器的正电源电压与电压V2的比总是恒定。即使假如该电压V2依液晶面板而变化，该运算放大器的正电源电压V123也总能被自动设置成与(R8+R9)/R9相乘的电压。
进而，根据本实施例，如由公式(6)所表示的，甚至由于环境温度变化，电压V2必定被改变的情况下，该电压123也能被自动改变。
如图1所示，虽然该缓冲器电路120的运算放大器的正电源可以是电压V123，如果电压VBAT高于电压V1，该运算放大器的正电源可以是VBAT，以便仍然达到较低的功耗。进而，即使该增压型开关调节器124的基准电压是分压电阻118和119之间的接点的电压，类似的效果也可以获得。在此情况下，公式(6)等于如下所述的：
V123＝V1·(R8+R9)/R9           (7)注意，在公式(6)中的R8和R9的值和公式(7)中的是不一样的。
进而，虽然已经描述了增压型开关调节器124的基准电压是如举例中的电压V1或电压V2中的任何一个，但本发明的要点在于，如果该基准电压是电压VH电压分配的电压作为在公共侧的电压，则该基准电压值可以是任何值。例如，电阻121的R7被分成两个，以使用该接点处的电压作为一增压型开关调节器的基准电压Vref2。
在本实施例中，虽然已经描述了利用一电感器的斩波器型开关调节器作为该开关调节器124的情况，但本发明并不限于此。很清楚，采用例如电压控制的充电泵型开关调节器也能获得类似效果。
根据本发明，具有利用一运算放大器的缓冲器电路通过从利用一运算放大器的输入电压作为它的基准电压的一开关调节器中提供该运算放大器的正电源建立整流侧的偏置电压的情况下，甚至假如该偏置比被改变时，该运算放大器的正电源电压与该运算放大器的输出电压的比也总是恒定的，这样，就产生一种效果，即能以低功耗执行该液晶显示器件而不依赖于该板。

Claims (3)

1.一种用于液晶的电源电路，该电路用于对一缓冲器电路分配和输入公共一侧的电压，该电压将提供给液晶面板以产生整流侧的偏置电压，上述电路的特征在于：
在公共侧所述的分压被用作为开关调节器的基准电压；和
所述开关调节器的输出电压被作为所述缓冲器电路的正电源电压。
2.一种用于液晶的电源电路包括：
一第一电源电路，用于在液晶面板的公共侧产生一电压；
一电压分配电路用于分配所述第一电源电路的输出电压；
一缓冲器电路，用于输出由所述电压分配电路分配的电压作为所述液晶面板的整流侧的偏置电压；和
一第二电源电路，利用由所述电压分配电路分配的电压作为一基准电压，
其特征在于，所述的缓冲器电路是这样构成的，电源是由所述第二电源电路提供。
3.一种用于液晶的电源电路包括：
一第一电源电路用于在液晶面板的公共侧产生一电压；
一电压分配电路，用于分配所述第一电源电路的输出电压成为第一和第二分压；
第一和第二缓冲器电路，用于输出由所述的电压分配电路分配的所述的第一和第二电压作为所述液晶面板的整流子侧的偏置电压；
利用由所述的电压分配电路分配的第一和第二电压中的一个作为基准电压的一第二电源电路，
其特征在于，所述第一和第二缓冲器电路是这样构成的，电源由所述第二电源电路提供。
CNB991112997A 1998-07-27 1999-07-27 用于液晶显示的电源电路 Expired - Fee Related CN1197228C (zh)

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JP10211221A JP3016143B2 (ja) 1998-07-27 1998-07-27 液晶用電源回路
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Cited By (4)

* Cited by examiner, † Cited by third party
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CN100394345C (zh) * 2004-03-03 2008-06-11 晶豪科技股份有限公司 电压产生器以及产生稳定电压的方法
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CN100394345C (zh) * 2004-03-03 2008-06-11 晶豪科技股份有限公司 电压产生器以及产生稳定电压的方法
CN100444219C (zh) * 2004-03-03 2008-12-17 精工爱普生株式会社 电压供给电路和方法、电源电路、电光装置和电子设备
CN101526678B (zh) * 2008-03-07 2011-12-21 群康科技(深圳)有限公司 电源电路和采用该电源电路的液晶显示装置

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US6369809B1 (en) 2002-04-09
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