JPH0289022A - Structure of temperature detection part of liquid crystal panel - Google Patents
Structure of temperature detection part of liquid crystal panelInfo
- Publication number
- JPH0289022A JPH0289022A JP63240405A JP24040588A JPH0289022A JP H0289022 A JPH0289022 A JP H0289022A JP 63240405 A JP63240405 A JP 63240405A JP 24040588 A JP24040588 A JP 24040588A JP H0289022 A JPH0289022 A JP H0289022A
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- temp
- temperature
- panel
- thin
- 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 56
- 238000001514 detection method Methods 0.000 title claims description 18
- 239000011521 glass Substances 0.000 claims abstract description 11
- 229910052751 metal Inorganic materials 0.000 claims abstract description 10
- 239000002184 metal Substances 0.000 claims abstract description 10
- 150000002739 metals Chemical class 0.000 claims abstract description 10
- 239000010409 thin film Substances 0.000 abstract description 8
- 229910000809 Alumel Inorganic materials 0.000 abstract description 4
- 229910001179 chromel Inorganic materials 0.000 abstract description 4
- 238000002834 transmittance Methods 0.000 abstract description 2
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229910001006 Constantan Inorganic materials 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000005338 heat storage Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
Landscapes
- Liquid Crystal (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
- Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
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の温度検出部構造に関する。[Detailed description of the invention] [Industrial application field] The present invention relates to a structure of a temperature detection section of a liquid crystal panel.
かかる液晶パネルは液晶パネルに照射された光をパネル
上の多数のシャッターで透過／非透過を選択透過させ感
光ドラム上に静電潜像を形成して印刷をおこなう電子写
真プリンター 複写桟あるいは一般の表示装置等に使用
される。Such a liquid crystal panel is used in an electrophotographic printer, a copy stand, or a general printer, in which the light irradiated onto the liquid crystal panel is selectively transmitted through a number of shutters on the panel to either transmit or not transmit, forming an electrostatic latent image on a photosensitive drum. Used for display devices, etc.
従来の液晶パネルの温度検出部構造は第４図の様に液晶
２３を封入したパネルガラス２２・２４の外部に蓄熱板
としてアルミニウムの板２６を有しその内部に固定され
たサーミスタ２１がパネルガラス２２を介した位置にお
ける温度を検出しこの検出結果を温度コントロール回路
にフィードバックをかけヒーター２５をＯＮ１０ Ｆ
Ｆする事により液晶の温度コントロールをするものであ
った。As shown in Fig. 4, the structure of the temperature detection section of a conventional liquid crystal panel has an aluminum plate 26 as a heat storage plate outside the panel glasses 22 and 24 in which the liquid crystal 23 is sealed, and a thermistor 21 fixed inside the aluminum plate 26. The temperature at the position via 22 is detected and the detection result is fed back to the temperature control circuit to turn on the heater 25.
The temperature of the liquid crystal was controlled by setting F.
しかし、前述の従来技術では液晶と温度検出部が離れて
いる為、液晶温度を安定化させる為のフィードバック（
パネルガラスを介して液晶を温める為のヒーター０Ｎ１
０ＦＦ）のタイミングが遅れてしまう、又、ガラスは熱
伝導率が低い材料のためガラスを介するとサーミスタの
固定部と液晶自体との間に温度差が生ずるという問題点
を有する。そこで本発明はこのような問題点を解決する
もので、その目的とするところは液晶パネル内部に温度
検出部を形成し液晶の温度を直接的に検出する事により
液晶の温度を正確にコントロールして液晶の透過光■ム
ラを少なくする事にある。However, in the conventional technology described above, the liquid crystal and temperature detection section are separated, so feedback (
Heater 0N1 for warming the liquid crystal via the panel glass
0FF) is delayed, and since glass is a material with low thermal conductivity, there are problems in that a temperature difference occurs between the fixed part of the thermistor and the liquid crystal itself when glass is interposed. The present invention is intended to solve these problems, and its purpose is to accurately control the temperature of the liquid crystal by forming a temperature detection section inside the liquid crystal panel and directly detecting the temperature of the liquid crystal. The goal is to reduce unevenness in the transmitted light of the liquid crystal.
本発明の液晶パネルの温度検出部構造は、液晶パネルを
構成する２枚のパネルガラスの内側にそれぞれ異種の金
属による電極を形成し、前述の電極は任意の液晶部分に
おいて接合部を有する事を特徴とする。The structure of the temperature detection part of the liquid crystal panel of the present invention is such that electrodes made of different metals are formed on the inside of the two panel glasses constituting the liquid crystal panel, and the aforementioned electrodes have a joint in any liquid crystal part. Features.
本発明の上記の構成によれば、異種の金属である２つの
電極部分において、接合部の温度が変化すると２つの電
極の間で熱起電力の変化が生じる（熱電対の原理）、熱
起電力の大きさは２種の金属の種類・接合部の温度・一
定の温度である基準接点の温度によって定まり、金属の
形状や寸法、途中の温度変化には影響されない、従って
、２種の金属の種類と熱起電力の大きさ、基準接点の温
度から２つの電極の接合する部分の液晶の温度を直接検
出する事ができる。According to the above configuration of the present invention, when the temperature of the joint between two electrode parts made of different metals changes, a change in thermoelectromotive force occurs between the two electrodes (principle of thermocouple). The amount of power is determined by the type of two metals, the temperature of the joint, and the constant temperature of the reference junction, and is not affected by the shape and dimensions of the metals or temperature changes during the process. The temperature of the liquid crystal at the junction of the two electrodes can be directly detected from the type of electrode, the magnitude of the thermoelectromotive force, and the temperature of the reference junction.
第１図は本発明の実施例における本願の特徴である液晶
パネルの温度検出部主要断面図であり、パネルガラス１
．２はそれぞれクロメルの薄膜電極４とアルメルの薄膜
電極５を有し、前記２種の金属はパネルガラス１．２に
より封入された液晶３に接するように接合点４−ａを持
つ、クロメルの薄膜電極４とアルメルの薄膜電極５の接
合点には液晶の温度に応じた熱起電力が生じる。前記２
種の金属以外にも、クロメル−コンスタンタン、銅−コ
ンスタンタンの組み合せ等、微小ではあっても起電力が
生じる組み合せは無数にある。FIG. 1 is a main cross-sectional view of the temperature detection part of the liquid crystal panel, which is a feature of the present application in an embodiment of the present invention, and shows the panel glass 1.
．． 2 has a thin film electrode 4 of chromel and a thin film electrode 5 of alumel, respectively, and the two metals are formed into a thin film of chromel having a junction 4-a in contact with the liquid crystal 3 sealed by the panel glass 1.2. A thermoelectromotive force corresponding to the temperature of the liquid crystal is generated at the junction between the electrode 4 and the alumel thin film electrode 5. Said 2
In addition to metals, there are countless combinations that generate electromotive force, even if minute, such as chromel-constantan and copper-constantan combinations.
第２図は本発明の実施例におけるブロック図である。液
晶温度検出部７において検出された熱起電力は各電極か
ら補償導線により基準接点補償回路８に入力される。前
述の熱起電力は接合部の二種の金属の種類と接合部の温
度と基準接点の温度によりきまっているので熱起電力に
より接合部の温度を求める為には基準接点の温度が一定
でなくてはならない、第３図は本発明の目的を達成でき
る回路構成のうちから一実施例として第２図の液晶温度
検出部７、基準接点補償回路８、増幅回路９をより具体
的に説明したものである。FIG. 2 is a block diagram of an embodiment of the present invention. The thermoelectromotive force detected by the liquid crystal temperature detection section 7 is inputted from each electrode to the reference junction compensation circuit 8 through compensation conductors. The thermoelectromotive force mentioned above is determined by the type of two metals in the joint, the temperature of the joint, and the temperature of the reference junction. Therefore, in order to determine the temperature of the joint by thermoelectromotive force, the temperature of the reference junction is not constant. FIG. 3 more specifically explains the liquid crystal temperature detection section 7, reference junction compensation circuit 8, and amplifier circuit 9 shown in FIG. 2 as an example of a circuit configuration that can achieve the object of the present invention. It is something.
液晶温度検出部１６と基準接点の温度差により発生した
熱起電力は入力端子板１５の入力端子１３．１４に入力
される。この入力端子を基準接点として補償する為に入
力端子板１５に密着させた測温抵抗体１７により入力端
子１３．１４（基準接点）の温度を測定しその温度に相
当する電圧を液晶温度検出部１６で発生した熱起電力に
より補償している。The thermoelectromotive force generated due to the temperature difference between the liquid crystal temperature detection section 16 and the reference junction is input to the input terminals 13 and 14 of the input terminal board 15. In order to compensate by using this input terminal as a reference junction, the temperature of the input terminals 13 and 14 (reference junction) is measured by the temperature measuring resistor 17 that is placed in close contact with the input terminal board 15, and the voltage corresponding to the temperature is sent to the liquid crystal temperature detection section. This is compensated by the thermoelectromotive force generated in step 16.
しかし、この熱起電力は極めて微小な電圧である為、絶
縁電源１８を用いる事により電源電圧変動による熱起電
力の変動を低く押え、オペアンプ１９は可変抵抗２０に
より熱起電力を信号処理上必要な電圧まで増幅し対ノイ
ズ性も向上させている。第２図増幅回路９により出力さ
れた液晶温度電圧と液晶温度設定回路１１により設定さ
れた任意の液晶温度電圧は液晶温度比較回路１０により
比較され設定温度より液晶温度が低い場合、ヒーター制
御・駆動回路１２よりヒーター６く第１図ヒーター６〉
を発熱させ、液晶温度が常に設定温度となる様制御され
る。However, since this thermal electromotive force is an extremely small voltage, by using the insulated power supply 18, fluctuations in the thermal electromotive force due to fluctuations in the power supply voltage can be kept low, and the operational amplifier 19 uses a variable resistor 20 to reduce the thermal electromotive force necessary for signal processing. The voltage is amplified to a certain level, and the noise resistance is also improved. The liquid crystal temperature voltage outputted by the amplifier circuit 9 and the arbitrary liquid crystal temperature voltage set by the liquid crystal temperature setting circuit 11 are compared by the liquid crystal temperature comparison circuit 10, and if the liquid crystal temperature is lower than the set temperature, the heater is controlled and driven. Heater 6 is connected to circuit 12 (Fig. 1 Heater 6)
generates heat, and the liquid crystal temperature is controlled so that it always remains at the set temperature.
以上、述べたように本発明によれば液晶パネル内部に異
種の金属の接合部を形成する事により温度検出部を構成
したので直接液晶の温度を検出する事が可能となり、液
晶の温度変化に対してヒーターの動作を時間差を生じさ
せずにコントロールし液晶温度が常に設定温度と等しく
なる様制御する事が容易であり、又、外部の熱影響も受
けない。As described above, according to the present invention, the temperature detection section is constructed by forming a joint of different metals inside the liquid crystal panel, so it is possible to directly detect the temperature of the liquid crystal, and it is possible to directly detect the temperature of the liquid crystal. On the other hand, it is easy to control the operation of the heater without creating a time difference so that the liquid crystal temperature is always equal to the set temperature, and it is not affected by external heat.
特に液晶の光量透過率変化をきらう液晶シャッターにお
いて設定温度に対する温度ムラを少なくし、又、一番透
過光量の高い液晶温度に容易に設定する事が可能である
等の効果が得られる。Particularly in a liquid crystal shutter that is sensitive to changes in the light transmittance of the liquid crystal, effects such as reducing temperature unevenness with respect to the set temperature and easily setting the liquid crystal temperature at which the amount of transmitted light is highest can be obtained.
第１図は本発明の実施例における液晶パネルの温度検出
部の主要断面図。
第２図は本発明の実施例におけるブロック図。
第３図は本発明の実施例における液晶温度検出部、基準
接点補償回路及び増幅回路の電気回路図。
第４図は従来の液晶パネルの温度検出部の主要断面図。
以 上
出願人 セイコーエプソン株式会社
代理人 弁理士 鈴木 喜三部 他１名第３図
第４図FIG. 1 is a main sectional view of a temperature detection section of a liquid crystal panel in an embodiment of the present invention. FIG. 2 is a block diagram in an embodiment of the present invention. FIG. 3 is an electrical circuit diagram of a liquid crystal temperature detection section, a reference junction compensation circuit, and an amplifier circuit in an embodiment of the present invention. FIG. 4 is a main cross-sectional view of the temperature detection section of a conventional liquid crystal panel. Applicant Seiko Epson Co., Ltd. Agent Patent Attorney Kizobe Suzuki and 1 other person Figure 3 Figure 4
Claims (1)
成される液晶パネルの温度検出構造において、前述の２
枚のパネルガラスの内側にそれぞれ異種の金属による電
極を形成し、前述の電極は任意の液晶部分において接合
部を有する事を特徴とする液晶パネルの温度検出部構造
。In the temperature detection structure of a liquid crystal panel consisting of two panel glasses and a liquid crystal sealed inside, the above-mentioned two
A structure for a temperature detection part of a liquid crystal panel, characterized in that electrodes made of different metals are formed on the inside of each panel glass, and each of the electrodes has a joint in an arbitrary liquid crystal part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63240405A JPH0289022A (en) | 1988-09-26 | 1988-09-26 | Structure of temperature detection part of liquid crystal panel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63240405A JPH0289022A (en) | 1988-09-26 | 1988-09-26 | Structure of temperature detection part of liquid crystal panel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0289022A true JPH0289022A (en) | 1990-03-29 |
Family
ID=17058978
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63240405A Pending JPH0289022A (en) | 1988-09-26 | 1988-09-26 | Structure of temperature detection part of liquid crystal panel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0289022A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013037209A (en) * | 2011-08-09 | 2013-02-21 | Seiko Epson Corp | Electro-optic device and electronic equipment, and method for driving electro-optic device |
-
1988
- 1988-09-26 JP JP63240405A patent/JPH0289022A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013037209A (en) * | 2011-08-09 | 2013-02-21 | Seiko Epson Corp | Electro-optic device and electronic equipment, and method for driving electro-optic device |
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