JPS6393209A - Driving voltage generating circuit - Google Patents
Driving voltage generating circuitInfo
- Publication number
- JPS6393209A JPS6393209A JP23971086A JP23971086A JPS6393209A JP S6393209 A JPS6393209 A JP S6393209A JP 23971086 A JP23971086 A JP 23971086A JP 23971086 A JP23971086 A JP 23971086A JP S6393209 A JPS6393209 A JP S6393209A
- Authority
- JP
- Japan
- Prior art keywords
- switch
- dividing resistances
- resistance value
- voltage
- dividing
- 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
- 239000004065 semiconductor Substances 0.000 claims 1
Landscapes
- Attenuators (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明はＬＣＤ駆動用の基準電圧を抵抗分割によって得
る回路に関し、特にその分割用の抵抗の値をスイッチに
より幾つかの任意の値に可変、設定できるＬＣＤ駆動電
圧発生回路である。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a circuit that obtains a reference voltage for driving an LCD by resistor division, and in particular, the present invention relates to a circuit that obtains a reference voltage for driving an LCD by resistor division. This is an LCD drive voltage generation circuit that can be set.
従来この種のＬＣＤ駆動電圧発生回路は、任意の電圧を
ＬＣＤ駆動に必要な電圧に等分割するため、一定の値の
抵抗を直列に接続し、ＬＣＤ駆動用の基準電圧を得る構
成になっていた。Conventionally, this type of LCD drive voltage generation circuit has a configuration in which a resistor of a certain value is connected in series to obtain a reference voltage for driving the LCD, in order to equally divide an arbitrary voltage into the voltage required for driving the LCD. Ta.
上述した従来のＬＣＤ駆動電圧発生回路は、分割用の抵
抗値が一定のため、ＬＣＤという容量性負荷に対し、Ｃ
Ｒの時定数を持った、ＬＣＤ駆動波形の鈍りを生ずる。In the conventional LCD drive voltage generation circuit described above, the dividing resistance value is constant, so the C
This causes the LCD drive waveform to become blunt with a time constant of R.
これを改善するＫは、この分割抵抗値自身を変更してや
る必要がありた。しかしＩＣ内部にこのような回路を内
蔵した場合、分割抵抗が固定となってしまうのでＬＣＤ
駆動波形の鈍沙を改善できないという欠点がある。In order to improve this, it was necessary to change the dividing resistance value itself. However, if such a circuit is built into the IC, the dividing resistor will be fixed, so the LCD
This method has the disadvantage that it cannot improve the dullness of the drive waveform.
本発明のＬＣＤ駆動電圧発生回路は、並列に設けられた
ＬＣＤ駆動用基準電圧を得る分割抵抗と、これら並列に
並んだ抵抗を接続させ、分割抵抗の抵抗値を選択するた
めのスイッチを有している。The LCD drive voltage generation circuit of the present invention includes dividing resistors arranged in parallel to obtain a reference voltage for driving an LCD, and a switch for connecting these parallel resistors and selecting the resistance value of the dividing resistor. ing.
次に本発明について図面を参照して説明する。 Next, the present invention will be explained with reference to the drawings.
第１図は本発明の実施例である。本実施例では２値の電
圧を必要とするＬＣＤ駆動電圧発生回路を示す。FIG. 1 shows an embodiment of the invention. This embodiment shows an LCD drive voltage generation circuit that requires a binary voltage.
分割抵抗１と２はそれぞれ等しい抵抗値を持っており図
のように直列に接続されている。これらの分割抵抗によ
ってＡ点とＢ点の電圧と、Ｂ点と０点の電圧は等しいも
のが得られる。また、これらの分割抵抗と更に直列に可
変抵抗３が接続されている。この可変抵抗は、任意の電
圧をこれらの抵抗で分割した場合、Ａ点と０点の電圧が
ＬＣＤのしきい値となるように調整するためのものであ
る。Dividing resistors 1 and 2 each have the same resistance value and are connected in series as shown in the figure. These dividing resistors make it possible to obtain equal voltages between points A and B and between points B and 0. Further, a variable resistor 3 is further connected in series with these dividing resistors. This variable resistor is for adjusting so that when an arbitrary voltage is divided by these resistors, the voltage at point A and point 0 becomes the threshold value of the LCD.
分割抵抗４と５も同じ抵抗値を持っており、これらはそ
れぞれ連動スイッチ６によって分割抵抗１．２と並列接
続できるようになっている。Dividing resistors 4 and 5 also have the same resistance value, and can be connected in parallel with dividing resistor 1.2 through interlocking switches 6, respectively.
すなわち、スイッチ６をＯＦＦとした場合は、分割抵抗
は１，２の抵抗値となるが、スイッチ６をＯＮにした場
合は分割抵抗は、１と４，２と５のそれぞれ並列抵抗の
合成抵抗値にすることができる。また、スイッチ６をＯ
Ｎした場合でもＯＦＦした場合でも、Ａ−Ｂ間とＢ−０
間の電圧は等しく保つことができる。そしてＡ−０間の
電圧は可変抵抗３を調整し、必要な電圧を得ることがで
きる、。In other words, when the switch 6 is turned off, the divided resistance has a resistance value of 1 and 2, but when the switch 6 is turned on, the divided resistance is the combined resistance of the parallel resistances 1 and 4, and 2 and 5. Can be a value. Also, turn switch 6 to
Whether it is N or OFF, between A-B and B-0
The voltage between them can be kept equal. The voltage between A and 0 can be adjusted by adjusting the variable resistor 3 to obtain the required voltage.
以上説明したように本発明は、内蔵するスイッチのＯＮ
、ＯＦＦによって、分割抵抗の抵抗値を変えることがで
きるのでＬＣＤ駆動波形の鈍りを容易に改善できる効果
がある。As explained above, the present invention enables the built-in switch to be turned on.
, OFF allows the resistance value of the dividing resistor to be changed, which has the effect of easily improving the dullness of the LCD drive waveform.
第１図は本発明の実施回路例である。
１・・・・・・分割抵抗、２・・・・・・分割抵抗、抵
抗値は分割抵抗１と同じ。３・・・・・・可変抵抗、４
・・・・・・分割抵抗、５・・・・・・分割抵抗、抵抗
値は分割抵抗４と同じ。
６・・・・・・連動スイッチ。FIG. 1 shows an example of an implementation circuit of the present invention. 1...Divided resistor, 2...Divided resistor, resistance value is the same as divided resistor 1. 3...Variable resistance, 4
...Divided resistor, 5...Divided resistor, resistance value is the same as divided resistor 4. 6... Interlocking switch.
Claims (1)
ニカル・スイッチ、半導体などの電子回路で構成された
スイッチまたは配線の有無によって選択できることを特
徴とする駆動電圧発生回路。A drive voltage generation circuit characterized in that the resistance value of a dividing resistor that divides a drive reference voltage can be selected depending on the presence or absence of a mechanical switch, a switch constituted by an electronic circuit such as a semiconductor, or wiring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23971086A JPS6393209A (en) | 1986-10-07 | 1986-10-07 | Driving voltage generating circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23971086A JPS6393209A (en) | 1986-10-07 | 1986-10-07 | Driving voltage generating circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6393209A true JPS6393209A (en) | 1988-04-23 |
Family
ID=17048771
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23971086A Pending JPS6393209A (en) | 1986-10-07 | 1986-10-07 | Driving voltage generating circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6393209A (en) |
-
1986
- 1986-10-07 JP JP23971086A patent/JPS6393209A/en active Pending
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