JPH0444625U - - Google Patents

Info

Publication number
JPH0444625U
JPH0444625U JP8686390U JP8686390U JPH0444625U JP H0444625 U JPH0444625 U JP H0444625U JP 8686390 U JP8686390 U JP 8686390U JP 8686390 U JP8686390 U JP 8686390U JP H0444625 U JPH0444625 U JP H0444625U
Authority
JP
Japan
Prior art keywords
light emitting
liquid crystal
operational amplifier
display device
receiving section
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
Application number
JP8686390U
Other languages
Japanese (ja)
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed filed Critical
Priority to JP8686390U priority Critical patent/JPH0444625U/ja
Publication of JPH0444625U publication Critical patent/JPH0444625U/ja
Pending legal-status Critical Current

Links

Landscapes

  • Transforming Electric Information Into Light Information (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Television Receiver Circuits (AREA)

Description

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本考案に係る液晶表示装置の自動コン
トラスト調整回路の一実施例を示すブロツク図、
第２図は同実施例の液晶セルの表示画面領域を説
明する正面図、第３図は同実施例の透過率検出用
表示部の設定箇所付近の断面図、第４図は従来例
を示す回路図である。 １……液晶セル、２……透過率検出用表示部、
３……発光素子、４……受光素子、５……発光駆
動回路、６……オペアンプ、７……ＣＰＵ、８…
…ＬＣＤ駆動回路、９……外装カバー、１０……
コネクター、Ａ……液晶セルの有効表示範囲、Ｂ
……表示画面。 FIG. 1 is a block diagram showing an embodiment of an automatic contrast adjustment circuit for a liquid crystal display device according to the present invention;
Fig. 2 is a front view illustrating the display screen area of the liquid crystal cell of the same embodiment, Fig. 3 is a sectional view near the setting location of the transmittance detection display section of the same embodiment, and Fig. 4 shows a conventional example. It is a circuit diagram. 1...Liquid crystal cell, 2...Transmittance detection display section,
3... Light emitting element, 4... Light receiving element, 5... Light emitting drive circuit, 6... Operational amplifier, 7... CPU, 8...
...LCD drive circuit, 9...Exterior cover, 10...
Connector, A...Effective display range of liquid crystal cell, B
...display screen.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 液晶表示装置の有効表示範囲内で、かつ表示画
面にかからない所に設定された透過率検出用表示
部の一方の側に設置された発光部と、前記透過率
検出用表示部の他方の側に設置された受光部と、
この受光部の検出信号を入力とする演算増幅器と
、液晶セルに駆動電圧を供給するＬＣＤ駆動回路
と、前記発光部に発光電流を供給する発光駆動回
路と、前記演算増幅器の出力を受け、所定の演算
を行つた結果に基づいて前記ＬＣＤ駆動回路を制
御するＣＰＵとを備えたことを特徴とする液晶表
示装置の自動コントラスト調整回路。 A light emitting part installed on one side of the transmittance detection display part set within the effective display range of the liquid crystal display device and not covering the display screen, and a light emitting part installed on the other side of the transmittance detection display part. The installed light receiving section and
An operational amplifier receives the detection signal of the light receiving section, an LCD driving circuit supplies a driving voltage to the liquid crystal cell, a light emitting driving circuit supplies a light emitting current to the light emitting section, and receives the output of the operational amplifier and outputs a predetermined value. An automatic contrast adjustment circuit for a liquid crystal display device, comprising: a CPU that controls the LCD drive circuit based on the result of the calculation.
JP8686390U 1990-08-20 1990-08-20 Pending JPH0444625U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8686390U JPH0444625U (en) 1990-08-20 1990-08-20

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8686390U JPH0444625U (en) 1990-08-20 1990-08-20

Publications (1)

Publication Number Publication Date
JPH0444625U true JPH0444625U (en) 1992-04-15

Family

ID=31818765

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8686390U Pending JPH0444625U (en) 1990-08-20 1990-08-20

Country Status (1)

Country Link
JP (1) JPH0444625U (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006054664A1 (en) * 2004-11-18 2006-05-26 Olympus Corporation Sensor unit and image display

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5185696A (en) * 1975-01-27 1976-07-27 Hitachi Ltd EKISHOHYOJISOCHINOONDOHOSHOHOSHIKI
JPS5552092A (en) * 1978-10-11 1980-04-16 Sony Corp Liquid crystal display unit

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5185696A (en) * 1975-01-27 1976-07-27 Hitachi Ltd EKISHOHYOJISOCHINOONDOHOSHOHOSHIKI
JPS5552092A (en) * 1978-10-11 1980-04-16 Sony Corp Liquid crystal display unit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006054664A1 (en) * 2004-11-18 2006-05-26 Olympus Corporation Sensor unit and image display

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