JPH01284766A - Consumption ammeter for liquid crystal panel - Google Patents
Consumption ammeter for liquid crystal panelInfo
- Publication number
- JPH01284766A JPH01284766A JP11383488A JP11383488A JPH01284766A JP H01284766 A JPH01284766 A JP H01284766A JP 11383488 A JP11383488 A JP 11383488A JP 11383488 A JP11383488 A JP 11383488A JP H01284766 A JPH01284766 A JP H01284766A
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- crystal panel
- voltage
- circuit
- cross switch
- 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
- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 42
- 230000000087 stabilizing effect Effects 0.000 claims 2
- 230000006641 stabilisation Effects 0.000 claims 1
- 238000011105 stabilization Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、液晶パネルを製造する：［程で、その消費電
流を測定し製品の検査をする計測器に関するものである
。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a measuring instrument for manufacturing liquid crystal panels and for measuring the current consumption thereof and inspecting the products.
本発明は、液晶パネルの消費電流測定において設定した
電圧を液晶パネルに印加しても消費電流の大きい場合、
途中のクロススイッチによる電圧降下をなくすために、
帰還回路から直接液晶パネルへ印加して、クロススイッ
チを帰還回路の入力側へ入れることによ１り電圧降下を
なくして正確な消費電流を測定できるようにしたもので
ある。In the present invention, when the current consumption is large even when the set voltage is applied to the liquid crystal panel when measuring the current consumption of the liquid crystal panel,
In order to eliminate the voltage drop caused by the cross switch in the middle,
By applying the voltage directly to the liquid crystal panel from the feedback circuit and inserting a cross switch to the input side of the feedback circuit, voltage drop can be eliminated and current consumption can be measured accurately.
従来、第２図に示すように、基準電圧回路１より供給さ
れる任意の電圧は帰還回路４で保持されて液晶パネル６
へ印加されるが、前記帰還回路４と液晶パネル６の間に
パルス発生回路２より発生するパルスで印加される直流
電流の極性を交互に切換えるクロススイッチ３が入って
いる、これにより前記液晶パネル６の両端の電圧の極性
が交互に切り替わり本来の交流駆勲の条件で動作する、
その時の電流を電流計５で測定して液晶パネル６の良、
否を判定していた。Conventionally, as shown in FIG. 2, an arbitrary voltage supplied from a reference voltage circuit 1 is held in a feedback circuit 4 and applied to a liquid crystal panel 6.
There is a cross switch 3 between the feedback circuit 4 and the liquid crystal panel 6 that alternately switches the polarity of the DC current applied by pulses generated by the pulse generating circuit 2. The polarity of the voltage at both ends of 6 is switched alternately and operates under the original AC driving conditions.
Measure the current at that time with an ammeter 5 to determine whether the liquid crystal panel 6 is good or not.
I was deciding no.
しかしながら、近年のエレクトロニクスの技術向上に伴
って液晶パネルが大型化してきている。However, with recent improvements in electronics technology, liquid crystal panels have become larger.
それに沿って液晶パネルも消費電流が増大してきた。従
来の装置では第２図に示すように帰還回路４と液晶パネ
ル６の間にクロススイッチ３を入れて液晶パネル６の両
端の電圧の極性を切り替えていたため、消費電流がふえ
るとクロススイッチ３で電圧降下が起こり設定電圧と液
晶パネル６に印加される電圧との間に誤差が生じ実際に
消費する電流が不正確となった。Along with this, the current consumption of liquid crystal panels has also increased. In the conventional device, as shown in Fig. 2, a cross switch 3 is inserted between the feedback circuit 4 and the liquid crystal panel 6 to switch the polarity of the voltage across the liquid crystal panel 6. Therefore, when the current consumption increases, the cross switch 3 A voltage drop occurred and an error occurred between the set voltage and the voltage applied to the liquid crystal panel 6, making the actual current consumed inaccurate.
上記問題点を解決するために、この発明は第１図に示す
ようにクロススイッチ３を基準電圧回路１と帰還回路４
の間に入れて、液晶パネル６の両端に前記帰還回路４を
各々に接続した構成とし、前記液晶パネル６の両端から
それぞれ帰還するようにした。In order to solve the above problems, the present invention provides a cross switch 3 with a reference voltage circuit 1 and a feedback circuit 4 as shown in FIG.
The feedback circuits 4 are connected to both ends of the liquid crystal panel 6 between the two ends of the liquid crystal panel 6, so that the feedback circuits 4 are fed back from both ends of the liquid crystal panel 6, respectively.
上記のように構成された液晶パネル間貸電流計では、消
費電流が過大であっても液晶パネル６の端子の電圧検知
により帰還回路４が制御して設定電圧が常に液晶パネル
に印加される。In the liquid crystal panel inter-current meter configured as described above, even if the current consumption is excessive, the feedback circuit 4 controls by detecting the voltage at the terminal of the liquid crystal panel 6, and the set voltage is always applied to the liquid crystal panel.
（実施例）
以下に、この発明の実施例を図面にもとづいて説明する
。第１図においてクロススイッチ３は基準電圧回路１か
ら指定される電圧と０■をパルス発生回路２から発生す
るパルスのタイミングにより交互に切り換へ交流信号と
する。前記クロススイッチ３の出力が帰還回路４を通っ
て液晶パネル６に印加されて、その時に流れる電流を電
流計５で測定する構成となっている。前記帰還回路４の
入力には駆動に必要な電圧のパルスが入力されるため、
前記液晶パネルは交流で駆動される。そして、液晶パネ
ル６の両端からそれぞれの帰還回路４に帰還される、そ
のため、入力された電圧と等しい電圧が前記液晶パネル
６の両端に印加される。(Example) Hereinafter, an example of the present invention will be described based on the drawings. In FIG. 1, the cross switch 3 alternately switches between the voltage designated by the reference voltage circuit 1 and 0 in accordance with the timing of the pulses generated from the pulse generating circuit 2 to generate an alternating current signal. The output of the cross switch 3 is applied to the liquid crystal panel 6 through a feedback circuit 4, and the current flowing at that time is measured by an ammeter 5. Since a voltage pulse necessary for driving is input to the input of the feedback circuit 4,
The liquid crystal panel is driven by alternating current. Then, the voltage is fed back from both ends of the liquid crystal panel 6 to each feedback circuit 4, so that a voltage equal to the input voltage is applied to both ends of the liquid crystal panel 6.
したがって、設定電圧通りの電圧を前記液晶パネル６に
印加することができ、設定電圧に対応する電流値の測定
ができる。Therefore, a voltage exactly as the set voltage can be applied to the liquid crystal panel 6, and a current value corresponding to the set voltage can be measured.
第３図は本発明の他の実施例である、クロススイッチ３
の一方の入力に基ｔＰ−電圧回路１からの正電圧を与え
、他の一方の入力に反転増幅回路７による負の電圧を入
れることｋより、印加電圧の範囲を倍にすることができ
る。FIG. 3 shows a cross switch 3 which is another embodiment of the present invention.
By applying a positive voltage from the base tP-voltage circuit 1 to one input of the tP-voltage circuit 1 and inputting a negative voltage from the inverting amplifier circuit 7 to the other input, the range of applied voltage can be doubled.
第４図は基準電圧源多電源化したドライバー回路図であ
り、基準電圧回路１ａから１ｄまでと０■の各々の電圧
をセレクト回路８の選択により、選択回路９が動作し液
晶パネル６の仕様に応じて任意の電圧を選択され帰還回
路４を通って液晶パネル６の両端にそれぞれ印加される
。その時の動作は前記帰還回路４による動作と同じであ
る。FIG. 4 is a driver circuit diagram with multiple reference voltage sources. By selecting each of the reference voltage circuits 1a to 1d and 0■ by the selection circuit 8, the selection circuit 9 operates and the specifications of the liquid crystal panel 6 are set. An arbitrary voltage is selected according to the voltage and applied to both ends of the liquid crystal panel 6 through the feedback circuit 4. The operation at that time is the same as that of the feedback circuit 4 described above.
この発明は、以上説明したように、液晶パネルの仕様に
沿って、設定される電圧が印加され交流化に伴う電圧降
下することがなく、設定電圧と等しい電圧が印加され、
そのときの正確な消費電流を測定することができるとい
う効果がある。As explained above, the present invention applies a set voltage in accordance with the specifications of the liquid crystal panel, does not cause a voltage drop due to alternating current, and applies a voltage equal to the set voltage.
This has the effect of being able to accurately measure the current consumption at that time.
第１図は、本発明の液晶パネルの消費電流計のブロック
図、第２図は従来の液晶パネルの消費電流計のブロック
図、第３図は、他の実施例の液晶パネル消費′ｔＩｉ流
計のブロック図、第４図は多電源のドライバー回路のブ
ロック図である。
１．１ａ、Ｉｂ、１ｃ、 １ｄ・・・基準電圧回路２・
・・パルス発生回路
３・・・クロススイッチ
４・・・帰還回路
５・・・電流計
６・・・液晶パネル
７・・・反転増幅回路
８・・・セレクト回路
９・・・選択回路
出願人 セイコー電子工業株式会社
代理人 弁理士 林 敬之助
本発Ｂ弓絹夜晶パ″’ＦＩＬハ滴脅電；毛針のアロ・、
フ塊図第１図
（疋承の液晶バイノし１７１渕を電：丸社のプロ”／
７ Ｊ東口第２図FIG. 1 is a block diagram of a current consumption meter for a liquid crystal panel according to the present invention, FIG. 2 is a block diagram of a conventional current consumption meter for a liquid crystal panel, and FIG. 3 is a block diagram of a consumption current meter for a liquid crystal panel according to another embodiment. Figure 4 is a block diagram of a multi-power supply driver circuit. 1.1a, Ib, 1c, 1d...Reference voltage circuit 2.
... Pulse generation circuit 3 ... Cross switch 4 ... Feedback circuit 5 ... Ammeter 6 ... Liquid crystal panel 7 ... Inverting amplifier circuit 8 ... Select circuit 9 ... Selection circuit Applicant Keinosuke Hayashi, Patent Attorney, Seiko Electronics Industries Co., Ltd. Original B Bow Silk Night Crystal Pa'''FIL Ha Drop Threatening Electron; Hair Needle Aro・,
Block diagram Figure 1 (Hikijo's LCD binoculars 171 edge: Marusha's professional)/
7 J East Exit Figure 2
Claims (1)
の帰還回路を径て、クロススイッチ手段で交流化して液
晶パネルに供給する構成で、該液晶パネルの消費電流を
計測するものにおいて、前記クロススイッチ手段と前記
安定化手段との間に電流計を挿入し、かつ前記安定化手
段のための帰還回路は、前記液晶パネルの端子から帰還
することを特徴とする液晶パネルの消費電流計。The current consumption of the liquid crystal panel is measured with a configuration in which the DC voltage is converted to AC through a reference voltage circuit for setting the DC voltage and a feedback circuit for the stabilization means, and is supplied to the liquid crystal panel by the cross switch means. A current consumption meter for a liquid crystal panel, characterized in that an ammeter is inserted between the cross switch means and the stabilizing means, and a feedback circuit for the stabilizing means feeds back from a terminal of the liquid crystal panel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11383488A JPH01284766A (en) | 1988-05-11 | 1988-05-11 | Consumption ammeter for liquid crystal panel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11383488A JPH01284766A (en) | 1988-05-11 | 1988-05-11 | Consumption ammeter for liquid crystal panel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01284766A true JPH01284766A (en) | 1989-11-16 |
Family
ID=14622212
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11383488A Pending JPH01284766A (en) | 1988-05-11 | 1988-05-11 | Consumption ammeter for liquid crystal panel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01284766A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005291972A (en) * | 2004-03-31 | 2005-10-20 | Casio Comput Co Ltd | Inspection circuit |
-
1988
- 1988-05-11 JP JP11383488A patent/JPH01284766A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005291972A (en) * | 2004-03-31 | 2005-10-20 | Casio Comput Co Ltd | Inspection circuit |
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