JPS5555584A - Photodiode display device - Google Patents

Photodiode display device

Info

Publication number
JPS5555584A
JPS5555584A JP12877178A JP12877178A JPS5555584A JP S5555584 A JPS5555584 A JP S5555584A JP 12877178 A JP12877178 A JP 12877178A JP 12877178 A JP12877178 A JP 12877178A JP S5555584 A JPS5555584 A JP S5555584A
Authority
JP
Japan
Prior art keywords
transistor
photodiode
luminance
base
conductive
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
JP12877178A
Other languages
Japanese (ja)
Inventor
Takeshi Tanabe
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sharp Corp
Original Assignee
Sharp Corp
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 by Sharp Corp filed Critical Sharp Corp
Priority to JP12877178A priority Critical patent/JPS5555584A/en
Publication of JPS5555584A publication Critical patent/JPS5555584A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/395—Linear regulators
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
    • H05B45/59—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits for reducing or suppressing flicker or glow effects
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Landscapes

  • Led Devices (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Control Of El Displays (AREA)

Abstract

PURPOSE:To provide the subject deivce wherein means for making luminance adjustment ineffective is incorporated in luminance adjusting means in a photodiode driving device thereby to prevent erroneous action of photodiode at the time of opening an electric source. CONSTITUTION:Transistors TR3 and TR4 incorporating therein passive elements 7 and 8 are mean for auxiliarily controlling the base voltage of a transistor TR2 to control the luminance in the lighting of a photodiode 1. A suitable resistor R is connected between the collector and base of a transistor TR4 cause a base current to flow to the transistor TR4 and make the same conductive. A capacitor CR is connected between a DC source voltage Vc and transistor TR4, and when a source switch 4 is opened, the transistor TR4 is applied with a base voltage in an extremely rapid period of time because of a charge accumulated in the capacitor C2, and becomes conductive, whereupon the luminance control becomes ineffective and the transistor TR2 becomes immediately non-conductive. For this reason, the diode 1 is forcibly set in non-lighted state, and no erroneous action is generated.
JP12877178A 1978-10-18 1978-10-18 Photodiode display device Pending JPS5555584A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12877178A JPS5555584A (en) 1978-10-18 1978-10-18 Photodiode display device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12877178A JPS5555584A (en) 1978-10-18 1978-10-18 Photodiode display device

Publications (1)

Publication Number Publication Date
JPS5555584A true JPS5555584A (en) 1980-04-23

Family

ID=14993055

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12877178A Pending JPS5555584A (en) 1978-10-18 1978-10-18 Photodiode display device

Country Status (1)

Country Link
JP (1) JPS5555584A (en)

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