CN1197228C - 用于液晶显示的电源电路 - Google Patents
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- 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
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Abstract
一种用于液晶显示的电源电路,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
技术领域
本发明涉及用于驱动液晶显示器件的电源电路。
背景技术
作为用于驱动液晶显示器件的普通电路,一种利用如图3电路图所示的整流稳压器的电源电路是熟知的。特别是使用整流稳压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=VL。如果该等式不被满足,就会引起衰减尾部和类似问题,其结果是损坏显示质量。在如图3所示的普通电源电路中,一变压器产生正负电压。无论如何,因为在普通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,和这样,为能以低功耗执行一液晶显示器件,该正电源电压必须根据该板的尺寸变化而不会产生问题。
发明内容
为解决上述问题,本发明的目的是提供一种用于液晶的电源电路,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整流稳压器的基准电压,该整流稳压器的输出电压被用作为该缓冲器电路的正电源电压。
根据本发明,提供了一种用于液晶显示器的电源电路,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;和利用由所述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,所述的缓冲器电路被构成为由所述第二电源电路向上述缓冲器电路提供电源电压。
本发明还提供了一种用于液晶显示器的电源电路,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被分配的电压;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,所述第一和第二缓冲器电路被构成为,由所述第二电源电路提供它们的电源电压。
附图说明
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。
具体实施方式
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,一增压型整流稳压器101和反向型整流稳压器102具有如图4所示的相同结构。图2所示的电压VH,V1,和VL由增压型整流稳压器101和反向型整流稳压器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。
增压型整流稳压器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。该增压斩波器型整流稳压器由作为外侧器件的电感器103和二极管104一起构成。还有该反向型整流稳压器102被构成有,一误差放大器114,控制电路115,和反馈电阻116和117。该反向斩波器型整流稳压器被由作为外侧器件的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由通过缓冲器电路120的分压电阻118和119之间接点建立。进而该电压V1被输入到该反向型整流稳压器102的V+侧的一端。
在图1中,在分压电阻121和118之间的接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被从增压型整流稳压器124的输出电压Vout2提供。该增压型整流稳压器124的电路结构与该增压型整流稳压器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整流稳压器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。由增压型整流稳压器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,H分压电阻119的电阻值R6通过公式(2)确定:
V1=VH-R6/(R5+R5+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,由反向型整流稳压器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。如果进行的调整满足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,该增压型整流稳压器124的基准电压是该分压电阻121和118之间的接点的电压。相应地,电压Vref2由公式(4)表示:
Vref2=VH·(R5+R6)/(R5+R6+R7) (4)
进而,该增压型整流稳压器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所示的用于确定电压Vout2的反馈电阻的该分压电阻109和110。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的比总能使其恒定。甚至假如该电压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由(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V123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,甚至该增压型整流稳压器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整流稳压器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整流稳压器的基准电压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整流稳压器作为该整流稳压器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整流稳压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整流稳压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 (2)
1.一种用于液晶显示器的电源电路,包括:
一第一电源电路(101),用于在液晶面板的公共侧产生一电压;
一电压分配电路(R5、R6、R7),用于分配所述第一电源电路的输出电压;
一缓冲器电路(122),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
利用由所述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(124),
所述的缓冲器电路被构成为由所述第二电源电路向上述缓冲器电路提供电源电压。
2.一种用于液晶显示器的电源电路,包括:
一第一电源电路(101),用于在液晶面板的公共侧产生一电压;
一电压分配电路(R5、R6、R7),用于分配所述第一电源电路的输出电压成为第一和第二被分配的电压;
第一和第二缓冲器电路(122),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(123),
所述第一和第二缓冲器电路被构成为,由所述第二电源电路提供它们的电源电压。
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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JP211221/98 | 1998-07-27 | ||
JP10211221A JP3016143B2 (ja) | 1998-07-27 | 1998-07-27 | 液晶用電源回路 |
JP211221/1998 | 1998-07-27 |
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CNB2005100091891A Division CN100477463C (zh) | 1998-07-27 | 1999-07-27 | 用于液晶显示的电源电路 |
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CN1243357A CN1243357A (zh) | 2000-02-02 |
CN1197228C true CN1197228C (zh) | 2005-04-13 |
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CNB2005100091891A Expired - Fee Related CN100477463C (zh) | 1998-07-27 | 1999-07-27 | 用于液晶显示的电源电路 |
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CNB2005100091891A Expired - Fee Related CN100477463C (zh) | 1998-07-27 | 1999-07-27 | 用于液晶显示的电源电路 |
Country Status (6)
Country | Link |
---|---|
US (1) | US6369809B1 (zh) |
JP (1) | JP3016143B2 (zh) |
KR (1) | KR20000012003A (zh) |
CN (2) | CN1197228C (zh) |
HK (1) | HK1024572A1 (zh) |
TW (1) | TW465167B (zh) |
Families Citing this family (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4743570B2 (ja) * | 2001-04-10 | 2011-08-10 | ルネサスエレクトロニクス株式会社 | 電源回路を内蔵した半導体集積回路および液晶表示制御装置並びに携帯用電子機器 |
KR100472360B1 (ko) * | 2001-12-08 | 2005-03-08 | 엘지.필립스 엘시디 주식회사 | 액정표시장치 및 그 구동방법 |
KR100463601B1 (ko) * | 2001-12-24 | 2004-12-29 | 엘지.필립스 엘시디 주식회사 | 액정표시소자의 공통 전압 발생 회로 |
KR100886234B1 (ko) * | 2002-09-05 | 2009-02-27 | 엘지디스플레이 주식회사 | 액정표시장치 |
US6781352B2 (en) * | 2002-12-16 | 2004-08-24 | International Rectifer Corporation | One cycle control continuous conduction mode PFC boost converter integrated circuit with integrated power switch and boost converter |
JP4352937B2 (ja) * | 2004-03-03 | 2009-10-28 | セイコーエプソン株式会社 | 電源回路、電気光学装置および電子機器 |
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 |
JP4895694B2 (ja) * | 2006-06-08 | 2012-03-14 | ルネサスエレクトロニクス株式会社 | 電源回路 |
CN101127483B (zh) * | 2006-08-18 | 2010-06-16 | 盛群半导体股份有限公司 | 应用于场发射显示器的电源供应器 |
JP4968904B2 (ja) * | 2006-12-08 | 2012-07-04 | ルネサスエレクトロニクス株式会社 | 表示パネル駆動装置、表示パネル駆動方法および表示装置 |
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 |
TWI486755B (zh) * | 2012-06-22 | 2015-06-01 | Askey Computer Corp | 電源供應模式切換電路及方法 |
KR102012022B1 (ko) | 2013-05-22 | 2019-08-20 | 삼성디스플레이 주식회사 | 표시 장치의 전원 공급 장치 |
KR101606087B1 (ko) * | 2015-03-31 | 2016-03-24 | 장진원 | 커버 홀 가공방법 및 홀 가공장치 |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ES2065327T3 (es) * | 1987-10-26 | 1995-02-16 | Canon Kk | Aparato de control. |
US5583528A (en) * | 1990-07-13 | 1996-12-10 | Citizen Watch Co., Ltd. | Electrooptical display device |
JPH09101496A (ja) * | 1995-10-04 | 1997-04-15 | Sharp Corp | 表示装置駆動用電圧発生装置 |
JP3552500B2 (ja) * | 1997-11-12 | 2004-08-11 | セイコーエプソン株式会社 | 論理振幅レベル変換回路,液晶装置及び電子機器 |
JPH11252903A (ja) * | 1998-03-03 | 1999-09-17 | Seiko Instruments Inc | 電源回路 |
-
1998
- 1998-07-27 JP JP10211221A patent/JP3016143B2/ja not_active Expired - Fee Related
-
1999
- 1999-07-26 US US09/360,773 patent/US6369809B1/en not_active Expired - Fee Related
- 1999-07-26 TW TW088112629A patent/TW465167B/zh not_active IP Right Cessation
- 1999-07-27 CN CNB991112997A patent/CN1197228C/zh not_active Expired - Fee Related
- 1999-07-27 CN CNB2005100091891A patent/CN100477463C/zh not_active Expired - Fee Related
- 1999-07-27 KR KR1019990030562A patent/KR20000012003A/ko not_active Application Discontinuation
-
2000
- 2000-06-16 HK HK00103649A patent/HK1024572A1/xx not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
JP2000047168A (ja) | 2000-02-18 |
HK1024572A1 (en) | 2000-10-13 |
JP3016143B2 (ja) | 2000-03-06 |
CN1655432A (zh) | 2005-08-17 |
US6369809B1 (en) | 2002-04-09 |
KR20000012003A (ko) | 2000-02-25 |
CN1243357A (zh) | 2000-02-02 |
CN100477463C (zh) | 2009-04-08 |
TW465167B (en) | 2001-11-21 |
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