JPH0181899U - - Google Patents

Info

Publication number
JPH0181899U
JPH0181899U JP1987178016U JP17801687U JPH0181899U JP H0181899 U JPH0181899 U JP H0181899U JP 1987178016 U JP1987178016 U JP 1987178016U JP 17801687 U JP17801687 U JP 17801687U JP H0181899 U JPH0181899 U JP H0181899U
Authority
JP
Japan
Prior art keywords
voltage
liquid crystal
display device
crystal display
inverter
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.)
Granted
Application number
JP1987178016U
Other languages
Japanese (ja)
Other versions
JP2536621Y2 (en
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 JP1987178016U priority Critical patent/JP2536621Y2/en
Publication of JPH0181899U publication Critical patent/JPH0181899U/ja
Application granted granted Critical
Publication of JP2536621Y2 publication Critical patent/JP2536621Y2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Landscapes

  • Circuit Arrangements For Discharge Lamps (AREA)
  • Liquid Crystal Display Device Control (AREA)

Description

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

第１図ないし第４図はこの考案の液晶表示装置
のバツクライト用ランプ駆動回路の１実施例を示
し、第１図は結線図、第２図および第３図はそれ
ぞれランプの供給電圧とランプの消費電力および
輝度との関係図、第４図は電池使用時間とランプ
の輝度との関係図、第５図は従来例の結線図、第
６図ａ，ｂは第５図の動作説明用の信号波形図、
第７図は一般のバツクライト用ランプの供給電圧
とランプの消費電力との関係図である。 １０……駆動部、１２……ＦＥＴ、１３……ト
ランス、１４……蛍光ランプ、１５……インバー
タ、２０……保持手段、３０……制御手段。 1 to 4 show one embodiment of the backlight lamp drive circuit of the liquid crystal display device of this invention, FIG. 1 is a wiring diagram, and FIGS. 2 and 3 respectively show the lamp supply voltage and the lamp drive circuit. Figure 4 is a diagram of the relationship between power consumption and brightness, Figure 4 is a diagram of the relationship between battery usage time and lamp brightness, Figure 5 is a connection diagram of the conventional example, and Figures 6a and b are diagrams for explaining the operation of Figure 5. Signal waveform diagram,
FIG. 7 is a diagram showing the relationship between the supply voltage of a general backlight lamp and the power consumption of the lamp. 10... Drive unit, 12... FET, 13... Transformer, 14... Fluorescent lamp, 15... Inverter, 20... Holding means, 30... Control means.

Claims (1)

【実用新案登録請求の範囲】 直流電源と、該直流電源に接続されたインバー
タ用トランスおよびスイツチング素子からなるイ
ンバータと、前記スイツチング素子の制御端子に
駆動パルスを出力して前記スイツチング素子を駆
動する駆動部とを備え、前記インバータの出力交
流により、液晶表示装置のバツクライト用ランプ
を駆動する液晶表示装置のバツクライト用ランプ
駆動回路において、 前記インバータ用トランスの１次電圧のピーク
に比例する電圧を保持する保持手段と、 前記保持手段による保持電圧と基準電圧とを比
較し、前記保持電圧が前記基準電圧に等しくなる
よう前記駆動パルスのパルス幅を制御する制御手
段と を設けた液晶表示装置のバツクライト用ランプ
駆動回路。[Claims for Utility Model Registration] An inverter consisting of a DC power supply, an inverter transformer and a switching element connected to the DC power supply, and a drive that outputs a drive pulse to a control terminal of the switching element to drive the switching element. A backlight lamp drive circuit for a liquid crystal display device that drives a backlight lamp of a liquid crystal display device using an output alternating current of the inverter, the circuit comprising: a voltage proportional to a peak of a primary voltage of the inverter transformer; A backlight for a liquid crystal display device, comprising: a holding means; and a control means for comparing the holding voltage by the holding means with a reference voltage and controlling the pulse width of the driving pulse so that the holding voltage becomes equal to the reference voltage. Lamp drive circuit.
JP1987178016U 1987-11-20 1987-11-20 Lamp driving circuit for backlight of liquid crystal display device Expired - Lifetime JP2536621Y2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1987178016U JP2536621Y2 (en) 1987-11-20 1987-11-20 Lamp driving circuit for backlight of liquid crystal display device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1987178016U JP2536621Y2 (en) 1987-11-20 1987-11-20 Lamp driving circuit for backlight of liquid crystal display device

Publications (2)

Publication Number Publication Date
JPH0181899U true JPH0181899U (en) 1989-05-31
JP2536621Y2 JP2536621Y2 (en) 1997-05-21

Family

ID=31469657

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1987178016U Expired - Lifetime JP2536621Y2 (en) 1987-11-20 1987-11-20 Lamp driving circuit for backlight of liquid crystal display device

Country Status (1)

Country Link
JP (1) JP2536621Y2 (en)

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5646673A (en) * 1979-09-26 1981-04-27 Toshiba Electric Equip Corp Power supply
JPS5646671A (en) * 1979-09-26 1981-04-27 Toshiba Electric Equip Corp Power supply
JPS56134493A (en) * 1980-03-26 1981-10-21 Olympus Optical Co Light source device
JPS59138199U (en) * 1983-03-04 1984-09-14 新電元工業株式会社 Discharge tube lighting circuit
JPS60207293A (en) * 1984-03-31 1985-10-18 東芝ライテック株式会社 Firing device
JPS60207292A (en) * 1984-03-31 1985-10-18 東芝ライテック株式会社 Firing device
JPS6274800U (en) * 1985-10-30 1987-05-13
JPS62219495A (en) * 1986-03-20 1987-09-26 ソニー株式会社 Discharge tube driver
JPS62254397A (en) * 1986-04-07 1987-11-06 増田電機株式会社 Fluorescent light lighting circuit

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5646673A (en) * 1979-09-26 1981-04-27 Toshiba Electric Equip Corp Power supply
JPS5646671A (en) * 1979-09-26 1981-04-27 Toshiba Electric Equip Corp Power supply
JPS56134493A (en) * 1980-03-26 1981-10-21 Olympus Optical Co Light source device
JPS59138199U (en) * 1983-03-04 1984-09-14 新電元工業株式会社 Discharge tube lighting circuit
JPS60207293A (en) * 1984-03-31 1985-10-18 東芝ライテック株式会社 Firing device
JPS60207292A (en) * 1984-03-31 1985-10-18 東芝ライテック株式会社 Firing device
JPS6274800U (en) * 1985-10-30 1987-05-13
JPS62219495A (en) * 1986-03-20 1987-09-26 ソニー株式会社 Discharge tube driver
JPS62254397A (en) * 1986-04-07 1987-11-06 増田電機株式会社 Fluorescent light lighting circuit

Also Published As

Publication number Publication date
JP2536621Y2 (en) 1997-05-21

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