JPS6377029A - Multi-output constant voltage power source - Google Patents
Multi-output constant voltage power sourceInfo
- Publication number
- JPS6377029A JPS6377029A JP22257386A JP22257386A JPS6377029A JP S6377029 A JPS6377029 A JP S6377029A JP 22257386 A JP22257386 A JP 22257386A JP 22257386 A JP22257386 A JP 22257386A JP S6377029 A JPS6377029 A JP S6377029A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- terminals
- output
- input
- power source
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000009413 insulation Methods 0.000 abstract 1
- 239000004973 liquid crystal related substance Substances 0.000 description 18
- 238000000034 method Methods 0.000 description 5
- 238000000149 argon plasma sintering Methods 0.000 description 4
- 230000015556 catabolic process Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 4
- 230000006386 memory function Effects 0.000 description 3
- 230000006870 function Effects 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 239000004986 Cholesteric liquid crystals (ChLC) Substances 0.000 description 1
- 101150064138 MAP1 gene Proteins 0.000 description 1
- 239000004988 Nematic liquid crystal Substances 0.000 description 1
- 241000238413 Octopus Species 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 238000009125 cardiac resynchronization therapy Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000003098 cholesteric effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
Landscapes
- Liquid Crystal (AREA)
- Liquid Crystal Display Device Control (AREA)
- Control Of Voltage And Current In General (AREA)
Abstract
Description
【発明の詳細な説明】
〔概 要〕
本発明は、所定電圧を出力する直流定電圧電源を積層し
てそれぞれ異なる電圧を出力する複数個の電圧端を設け
、これらのうちから出力しようとする電圧より高い電圧
と低い電圧の電圧端を選んでバッファアンプの２つの入
力端のそれぞれに接続するとともに、上記出力しようと
する電圧を基準電圧として上記バッファアンプの制？３
’［Ｉ端に入力することにより、上記基準電圧と等しい
電圧を出力端より出力する低インピーダンス電源を構成
したものであって、この構成としたことにより、高電圧
多値出力定電圧電源が低耐圧素子を用いて構成可能、従
ってＩＣ化可能となる。[Detailed Description of the Invention] [Summary] The present invention is a method of stacking DC constant voltage power supplies that output a predetermined voltage, providing a plurality of voltage terminals each outputting a different voltage, and attempting to output from among these voltage terminals. Select the voltage terminals higher and lower than the voltage and connect them to each of the two input terminals of the buffer amplifier, and use the voltage to be output as the reference voltage to control the buffer amplifier. 3
'[By inputting it to the I terminal, a low impedance power supply is configured that outputs a voltage equal to the above reference voltage from the output terminal. By adopting this configuration, the high voltage multi-level output constant voltage power supply can be It can be constructed using voltage-resistant elements, and therefore can be integrated into an IC.
本発明は、低出力インピーダンスの多値出力定電圧電源
に係り、特に相転移液晶の駆動等に必要な高電圧多値出
力（例えば１２０Ｖ、 ８０Ｖ、 ４０Ｖ。The present invention relates to a multi-value output constant voltage power supply with low output impedance, and particularly to a high-voltage multi-value output (for example, 120V, 80V, 40V) necessary for driving a phase change liquid crystal.
０■の４種）を得ることのできる２Ｂを、安価な低耐圧
素子を用いて構成することを可能ならしめる回路構成に
関する。The present invention relates to a circuit configuration that makes it possible to configure a 2B capable of obtaining four types of 0■ using inexpensive low-voltage elements.
近年におけるＯＡ化の進展に伴い、各種業務用文書の電
子化が急速に押し進められている。この電子化の波は会
議、教育の場にも及び、従来の黒板、ＯＨＰ （オーバ
ーヘッドプロジェクタ）に代わる大型ディスプレイへの
ニーズが高まってきた。With the progress of OA in recent years, the digitization of various business documents is being rapidly promoted. This wave of computerization has spread to conferences and educational settings, and the need for large displays to replace traditional blackboards and OHPs (overhead projectors) has increased.
大型（大画面）表示装置には古くから映像表示用への用
途があり、これまで高輝度ＣＲＴ、ライトパルプ、レー
ザなどを用いた投射表示方式が開発され、既に実用に供
されている。Large-sized (large screen) display devices have long been used for displaying images, and projection display systems using high-brightness CRTs, light pulp, lasers, etc. have been developed and are already in practical use.
しかし、これらはいずれも高精度な光学系を使用するた
め、１００万〜１０００万円と高価であり、普及性に問
題があった。このため、ＯＡ分野で応用に適した機能と
価格を持つ新しい大型ディスプレイの出現が待たれてい
る。However, since these all use highly accurate optical systems, they are expensive at 1 million to 10 million yen, which poses a problem in their widespread use. Therefore, the emergence of a new large display with functions and prices suitable for application in the OA field is awaited.
相転移型液晶（ネマティック液晶とコレステリンク液晶
の混合液晶）は大型表示装置を作成するのに適したもの
として有望視されているが、これは、ネマティック／コ
レステリンクの相転移現象に基づく光透過率のヒステリ
シス現象を利用して情報表示を行うものである。Phase change liquid crystals (mixed liquid crystals of nematic and cholesteric liquid crystals) are seen as promising as suitable for creating large display devices; Information is displayed using the rate hysteresis phenomenon.
その動作原理の概略を第２図（ａ）〜（Ｃ１に示す。印
加電圧が高い場合は、同図（Ｃ）に見られる如く液晶分
子１２は電界に沿って基板２と垂直に配向され（ネマテ
ィック相）、透明状態となる。An outline of its operating principle is shown in Figures 2 (a) to (C1). When the applied voltage is high, the liquid crystal molecules 12 are aligned perpendicular to the substrate 2 along the electric field as seen in Figure 2 (C). nematic phase) and becomes transparent.
一方印加電圧が低い場合は、同図（ｂｌに見られるごと
く、液晶分子１１は自分自身の力により螺旋を巻き（コ
レステリック相）、光散乱状態となる。On the other hand, when the applied voltage is low, as seen in the same figure (bl), the liquid crystal molecules 11 wind into a spiral (cholesteric phase) due to their own force, and enter a light scattering state.
そして、両者の力のバランスにより、ある電圧領域で双
安定状態が生じる。同図（ａｌに示すように、上記双安
定状態の電圧領域の中心値Ｖ４が動作電圧である。２ｖ
ａを印加することにより透明状態、Ｏｖを印加すること
により光散乱状態とすることができる。更に、これに続
いてＶ４を印加することによりそれぞれの状態を維持す
ることができる。The balance between the two forces creates a bistable state in a certain voltage range. As shown in the same figure (al), the central value V4 of the voltage region of the bistable state is the operating voltage.2v
A transparent state can be achieved by applying a, and a light scattering state can be achieved by applying Ov. Furthermore, each state can be maintained by subsequently applying V4.
この機能はメモリ機能として利用される。このメモリ機
能を利用することにより、原理上無制限の表示容量を実
現できる。This function is used as a memory function. By using this memory function, unlimited display capacity can be achieved in principle.
表示は液晶をライトバルブとする投写方式を用いる。第
３図に投写光学系の概略を示す。液晶が透明状態（図の
１２で示す部分）のとき、透過光は反射板１４表面に設
けられた反射層（図示せず）で反射され、投写レンズ１
５によって集光されてスクリーン１６上では明状態とな
り、他方光散乱状態（図の１１で示す部分）の時は集光
されず、スクリーン１６上では暗状態となる。The display uses a projection method using a liquid crystal as a light valve. FIG. 3 shows an outline of the projection optical system. When the liquid crystal is in a transparent state (the part indicated by 12 in the figure), the transmitted light is reflected by a reflective layer (not shown) provided on the surface of the reflecting plate 14, and is reflected by the projection lens 1.
5, the light is focused on the screen 16 to be in a bright state, while in the light scattering state (the part indicated by 11 in the figure), the light is not focused and the screen 16 is in a dark state.
なお１７はミラー、１８は集光用フレネルレンズである
。Note that 17 is a mirror, and 18 is a condensing Fresnel lens.
この相転移型液晶を用いた表示方式には、一般のＴＮ型
液晶やレーザ書き込み型液晶の場合に比べ、以下の優れ
た特徴がある。The display method using this phase change type liquid crystal has the following excellent features compared to the case of a general TN type liquid crystal or a laser writing type liquid crystal.
（１１大容量表示が可能。(11 large capacity display possible.
メモリ機能の利用により、従来のＴＮ型では困難な表示
ライン数４００本以上を実現できる。By using the memory function, it is possible to achieve a display of more than 400 lines, which is difficult with conventional TN type.
（２） 明るい表示が得られる。(2) A bright display can be obtained.
光散乱を利用するため偏光板が不要で、ＴＮ型の約２倍
の透過率が得られる。Since it utilizes light scattering, there is no need for a polarizing plate, and the transmittance is approximately twice that of the TN type.
（３）コンパクトで安価な装置構成が可能。(3) Compact and inexpensive equipment configuration is possible.
情報書き込みを電子回路で行うことができ、レーザビー
ムをスキャンするための高価な光学系が不要である。Information can be written using an electronic circuit, and an expensive optical system for scanning the laser beam is not required.
一般に液晶パネルを駆動するには、多種類の電源を必要
とする。現在量も普及しているＴＮ型液晶の場合、電圧
平均化法（例えばオーム社発行の液晶エレクトロニクス
の基礎と応用ＰＰ、９２〜９７参照）では、６種類の電
源を要する。ＴＮ型液晶パネルは動作電圧が低いため（
閾値２Ｖ、マルチプレックス駆動時の最大電圧は３０Ｖ
以下）、その電源構成は第４図に示すように、一般に３
０Ｖの耐圧を有するバッファアンプ２１を組み合わせて
実現できる。このように耐圧が低い場合には、バッファ
アンプ２１をＩＣ化するのは容易で、現実にリニアＩＣ
として実用に供されている。Generally, driving a liquid crystal panel requires many types of power sources. In the case of TN type liquid crystals, which are currently popular, six types of power supplies are required in the voltage averaging method (see, for example, Fundamentals and Applications of Liquid Crystal Electronics PP, published by Ohm Publishing Co., Ltd., pp. 92-97). Since the operating voltage of TN type liquid crystal panels is low (
Threshold value 2V, maximum voltage when driving multiplex is 30V
(below), its power supply configuration is generally 3 as shown in Figure 4.
This can be realized by combining a buffer amplifier 21 having a breakdown voltage of 0V. When the withstand voltage is low, it is easy to convert the buffer amplifier 21 into an IC, and it is actually possible to use a linear IC.
It is put into practical use as a.
しかし、相転移型液晶パネルは最大電圧が例えば１２０
ｖ或いは１３５Ｖと高いため、その電源を第４図に示す
従来の構成法で作成しようとすると、極めて高耐圧（１
２０Ｖ或いは１３５ｖ耐圧）のバッファアンプ２１が必
要となる。このように耐圧が高いＩＣを作成するのは必
ずしも容易ではな（、また高価格となる。However, the maximum voltage of a phase change type liquid crystal panel is, for example, 120
V or 135V, so if you try to create the power supply using the conventional configuration method shown in Figure 4, it will require an extremely high breakdown voltage (135V).
A buffer amplifier 21 (withstand voltage of 20V or 135V) is required. It is not necessarily easy to create an IC with such high breakdown voltage (and it is also expensive).
本発明の目的は、相転移型液晶パネルを駆動するための
、安価で高電圧を出力可能な多値出力定電圧電源を提供
することにある。An object of the present invention is to provide a multi-value output constant voltage power supply that is inexpensive and capable of outputting high voltage for driving a phase change type liquid crystal panel.
低圧の直流定電圧電源を複数個積層してそれぞれ電圧の
異なる複数個の電圧端を有する多値電圧源を構成すると
ともに、複数個のバッファアンプを設け、各バッファア
ンプの２つの入力端に上記複数個の電圧端の中からそれ
ぞれ２つの電圧を選んで入力し、且つこの２つの電圧範
囲内の電圧を基準電圧としてバッファアンプの制御端に
入力することにより、各バッファアンプをその出力端か
ら上記基準電圧と等しい電圧を出力する低インピーダン
ス電源とする。A multi-value voltage source is constructed by stacking a plurality of low-voltage DC constant voltage power supplies each having a plurality of voltage terminals with different voltages, and a plurality of buffer amplifiers are provided, and the two input terminals of each buffer amplifier are connected to the By selecting and inputting two voltages from each of a plurality of voltage terminals, and inputting the voltages within these two voltage ranges as reference voltages to the control terminal of the buffer amplifier, each buffer amplifier can be controlled from its output terminal. A low impedance power supply that outputs a voltage equal to the reference voltage mentioned above is used.
直流定電圧電源を積層して多値電圧源を構成したので、
個々の直流定電圧電源は低電圧化でき、従ってこれをリ
ニアＩＣ化するのは容易となり、低価格化も可能となる
。Since we configured a multi-value voltage source by stacking DC constant voltage power supplies,
The voltage of each DC constant voltage power supply can be reduced, so it is easy to convert it into a linear IC, and the cost can be reduced.
以下本発明の一実施例を第１図により説明する。 An embodiment of the present invention will be described below with reference to FIG.
同図に示す一実施例は、直流定電圧電源３１として５ｖ
入力の入出力絶縁型ＤＤコンバータ（ディジタル−ディ
ジタル・コンバータ）を用い、これを５個積層して、−
１５Ｖがら１３５ｖまテ１５Ｖ間隔の多数の電圧端３３
を有する多値電圧源３４を構成し、また３個のバッファ
アンプ３２−１ 、３２−２．３２−３はいずれもボル
テージフォロワを用いている。In one embodiment shown in the figure, the DC constant voltage power supply 31 is 5V.
Using an input/output isolated type DD converter (digital-digital converter), stacking five of these converters, -
Multiple voltage terminals 33 at 15V intervals from 15V to 135V
The three buffer amplifiers 32-1, 32-2, and 32-3 all use voltage followers.
また、基準電圧は上記多値電圧源の最大電圧の電圧端よ
り導出した電圧を抵抗分割して生成し、バッファアンプ
３２−１．３２−２．３２−３の各制御端３５に入力し
ている。Further, the reference voltage is generated by resistor-dividing the voltage derived from the maximum voltage terminal of the multi-value voltage source, and inputted to each control terminal 35 of the buffer amplifier 32-1.32-2.32-3. There is.
更に上記バッファアンプ３２−１．３２−２．３２−３
の第１及び第２の入力端には、各制御端３５に入力した
基準電圧より低い電圧と高い電圧の電圧端を、それぞれ
上記複数個の電圧端３３のうちから選択して接続する。Furthermore, the buffer amplifier 32-1.32-2.32-3
A voltage terminal having a voltage lower and a voltage higher than the reference voltage input to each control terminal 35 is selected from among the plurality of voltage terminals 33 and connected to the first and second input terminals of the control terminal 35 .
この構成により、各バッファアンプ３２−１．３２−２
゜３２−３は、それぞれの出力端３８から、入力された
基準電圧に等しい電圧が出力される低インピーダンス定
電圧電源となる。With this configuration, each buffer amplifier 32-1, 32-2
32-3 is a low impedance constant voltage power supply that outputs a voltage equal to the input reference voltage from each output terminal 38.
以上述べたように本実施例によれば、相転移液晶パネル
の駆動に必要な、ＯＶ、４０Ｖ （Ｖｄ） 。As described above, according to this embodiment, the OV, 40V (Vd) required to drive the phase change liquid crystal panel.
８０Ｖ （２Ｖ、 ） 、 １２０Ｖ （３Ｖｄ ）
（７）４値高電圧を出力し得る多値出力定電圧電源を
、低耐圧ＩＣのみから生成でき、従って低価格化が可能
となる。80V (2V, ), 120V (3Vd)
(7) A multi-value output constant voltage power supply capable of outputting a four-value high voltage can be generated from only a low-voltage IC, thus making it possible to reduce the cost.
以上説明した如く本発明によれば、多値出力定電圧電源
を、低耐圧ＩＣによって構成可能となり、従って低価格
化も実現できる。As described above, according to the present invention, a multi-value output constant voltage power supply can be constructed using a low breakdown voltage IC, and therefore, the cost can be reduced.
第１図は本発明一実施例の構成説明図、第２図（ａｌ〜
（Ｃ）は相転移型液晶の動作原理説明図、第３図は従来
の投写光学系説明図、
第４図は従来の定電圧電源の構成説明図である。
図において、３１は直流定電圧電源、３２−１．３２−
２゜３２−３はバッファアンプ、３３は電圧端、３４は
多値電圧源、３５は制御端、３６．３７は第１及び第２
の入力端、３８は出力端を示す。
３４引１を圧板
本発明徨鉋例の端株′Ｊｔ哨図
第１図
ＱＩＩＯＴＦＬ （Ｖ）
々軸杆７庚品褐力作
【ｂ＋ （Ｃ）コレステ
リ、フ不８ε見ａ 年マディー７
７１ｓ梵ＰｇロアＤ転才う￥ンＩＧシり重ρづＴ原理ｔ
ヒ明タコ第２図
！廷／ｌ股写芝掌米訝θＲの
第３図
％ｘ之電Ｆ電璋稍端虞訝明Ｉ
第４図FIG. 1 is an explanatory diagram of the configuration of one embodiment of the present invention, and FIG. 2 (al~
(C) is an explanatory diagram of the operating principle of a phase change type liquid crystal, FIG. 3 is an explanatory diagram of a conventional projection optical system, and FIG. 4 is an explanatory diagram of the configuration of a conventional constant voltage power supply. In the figure, 31 is a DC constant voltage power supply, 32-1.32-
2゜32-3 is a buffer amplifier, 33 is a voltage terminal, 34 is a multi-value voltage source, 35 is a control terminal, 36.37 is the first and second
, and 38 represents the output end. 34-pull 1 is pressed plate This invention's floating plane example fractional stock 'Jt sill map 1 QIIOTFL (V) 7-axis rod 7 庚品Brown power work [b+ (C) Cholesteri, fufu 8ε seen a year Maddy 7
71s Sanskrit Pg Roa D Conversion u\n IG Shiriju ρzu T principle t
Hiaki Octopus Figure 2! Fig. 3 of the table/l crotch photo palm rice question θR
Claims (1)
れぞれ異なる電圧を出力する複数個の電圧端（３３）を
具備する多値電圧源（３４）と、制御端（３５）と第１
の入力端（３６）及び第２の入力端（３７）と出力端（
３８）とを有する複数個のバッファアンプ（３２）とを
具え、 前記各バッファアンプ（３２）の制御端（３５）にそれ
ぞれ所望の電圧を基準電圧として入力するとともに、各
バッファアンプの第１の入力端（３６）及び第２の入力
端（３７）に、そのバッファアンプ（３２）の制御端（
３５）に入力された基準電圧より低い電圧及び高い電圧
の電圧端（３３）を前記多値電圧源（３４）より選択し
て接続し、出力端（３８）から前記入力された基準電圧
に等しい電圧を出力するように構成したことを特徴とす
る多値出力定電圧電源。[Claims] A multi-value voltage source (34) comprising a plurality of voltage terminals (33) in which DC voltage power supplies (31) that output a predetermined voltage are stacked and each outputs a different voltage, and a control terminal (35). ) and the first
The input end (36), the second input end (37) and the output end (
a plurality of buffer amplifiers (32) with The control terminal (32) of the buffer amplifier (32) is connected to the input terminal (36) and the second input terminal (37).
35) are selected from the multi-value voltage source (34) and connected to voltage terminals (33) with voltages lower and higher than the input reference voltage, and output from the output terminal (38) equal to the input reference voltage. A multi-value output constant voltage power supply characterized by being configured to output voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22257386A JPS6377029A (en) | 1986-09-19 | 1986-09-19 | Multi-output constant voltage power source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22257386A JPS6377029A (en) | 1986-09-19 | 1986-09-19 | Multi-output constant voltage power source |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6377029A true JPS6377029A (en) | 1988-04-07 |
Family
ID=16784583
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22257386A Pending JPS6377029A (en) | 1986-09-19 | 1986-09-19 | Multi-output constant voltage power source |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6377029A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008299716A (en) * | 2007-06-01 | 2008-12-11 | Panasonic Corp | Voltage generation circuit, analog/digital conversion circuit, and image sensor system |
-
1986
- 1986-09-19 JP JP22257386A patent/JPS6377029A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008299716A (en) * | 2007-06-01 | 2008-12-11 | Panasonic Corp | Voltage generation circuit, analog/digital conversion circuit, and image sensor system |
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