LIGHT EMITTING DIODE DRIVING CIRCUIT
PROBLEM TO BE SOLVED: To enable use of electrically conductive material having large resistivi ty as an electrically conductive material to be formed in a flexible printed circuit board by impressing the voltage obtained by boosting a system voltage on light emitting diodes while connecting the ligh...
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| creator | MOMOSE SHIGERU NAKAJO KOICHI OKADA SHIGEAKI |
| description | PROBLEM TO BE SOLVED: To enable use of electrically conductive material having large resistivi ty as an electrically conductive material to be formed in a flexible printed circuit board by impressing the voltage obtained by boosting a system voltage on light emitting diodes while connecting the light emitting diodes in series and driving the light emitting diodes with a constant current. SOLUTION: In a light emitting diode driving circuit, in lighting a liquid crystal display, a transistor Q2 is controlled to be in an operating state and the output voltage from a voltage boosting circuit 21 is impressed on one end of serially connected light emitting diodes 11-14. The constant current of 7mA is made to flow into a constant current circuit 22 and the constant current made to flow into the constant current circuit 22 is made to flow in the light emitting diodes 11-14 and they are made to emit lights. In this case, the serially connected light emitting diodes 11-14 are driven with the constant current of 7mA. Thus, the variation of brightness in lighting is eliminated in spite of the variation of resistivities of electrically conductive material 32. |
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SOLUTION: In a light emitting diode driving circuit, in lighting a liquid crystal display, a transistor Q2 is controlled to be in an operating state and the output voltage from a voltage boosting circuit 21 is impressed on one end of serially connected light emitting diodes 11-14. The constant current of 7mA is made to flow into a constant current circuit 22 and the constant current made to flow into the constant current circuit 22 is made to flow in the light emitting diodes 11-14 and they are made to emit lights. In this case, the serially connected light emitting diodes 11-14 are driven with the constant current of 7mA. Thus, the variation of brightness in lighting is eliminated in spite of the variation of resistivities of electrically conductive material 32.</description><edition>6</edition><language>eng</language><subject>ADVERTISING ; ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICESUSING STATIC MEANS TO PRESENT VARIABLE INFORMATION ; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS ; CRYPTOGRAPHY ; DISPLAY ; EDUCATION ; ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR ; ELECTRICITY ; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS ; PHYSICS ; PRINTED CIRCUITS ; SEALS</subject><creationdate>1997</creationdate><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=19970815&DB=EPODOC&CC=JP&NR=H09212130A$$EHTML$$P50$$Gepo$$Hfree_for_read</linktohtml><link.rule.ids>230,309,781,886,25566,76549</link.rule.ids><linktorsrc>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=19970815&DB=EPODOC&CC=JP&NR=H09212130A$$EView_record_in_European_Patent_Office$$FView_record_in_$$GEuropean_Patent_Office$$Hfree_for_read</linktorsrc></links><search><creatorcontrib>MOMOSE SHIGERU</creatorcontrib><creatorcontrib>NAKAJO KOICHI</creatorcontrib><creatorcontrib>OKADA SHIGEAKI</creatorcontrib><title>LIGHT EMITTING DIODE DRIVING CIRCUIT</title><description>PROBLEM TO BE SOLVED: To enable use of electrically conductive material having large resistivi ty as an electrically conductive material to be formed in a flexible printed circuit board by impressing the voltage obtained by boosting a system voltage on light emitting diodes while connecting the light emitting diodes in series and driving the light emitting diodes with a constant current. SOLUTION: In a light emitting diode driving circuit, in lighting a liquid crystal display, a transistor Q2 is controlled to be in an operating state and the output voltage from a voltage boosting circuit 21 is impressed on one end of serially connected light emitting diodes 11-14. The constant current of 7mA is made to flow into a constant current circuit 22 and the constant current made to flow into the constant current circuit 22 is made to flow in the light emitting diodes 11-14 and they are made to emit lights. In this case, the serially connected light emitting diodes 11-14 are driven with the constant current of 7mA. Thus, the variation of brightness in lighting is eliminated in spite of the variation of resistivities of electrically conductive material 32.</description><subject>ADVERTISING</subject><subject>ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICESUSING STATIC MEANS TO PRESENT VARIABLE INFORMATION</subject><subject>CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS</subject><subject>CRYPTOGRAPHY</subject><subject>DISPLAY</subject><subject>EDUCATION</subject><subject>ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR</subject><subject>ELECTRICITY</subject><subject>MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS</subject><subject>PHYSICS</subject><subject>PRINTED CIRCUITS</subject><subject>SEALS</subject><fulltext>true</fulltext><rsrctype>patent</rsrctype><creationdate>1997</creationdate><recordtype>patent</recordtype><sourceid>EVB</sourceid><recordid>eNrjZFDx8XT3CFFw9fUMCfH0c1dw8fR3cVVwCfIMA_GcPYOcQz1DeBhY0xJzilN5oTQ3g6Kba4izh25qQX58anFBYnJqXmpJvFeAh4GlkaGRobGBozExagB7QSMV</recordid><startdate>19970815</startdate><enddate>19970815</enddate><creator>MOMOSE SHIGERU</creator><creator>NAKAJO KOICHI</creator><creator>OKADA SHIGEAKI</creator><scope>EVB</scope></search><sort><creationdate>19970815</creationdate><title>LIGHT EMITTING DIODE DRIVING CIRCUIT</title><author>MOMOSE SHIGERU ; NAKAJO KOICHI ; OKADA SHIGEAKI</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-epo_espacenet_JPH09212130A3</frbrgroupid><rsrctype>patents</rsrctype><prefilter>patents</prefilter><language>eng</language><creationdate>1997</creationdate><topic>ADVERTISING</topic><topic>ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICESUSING STATIC MEANS TO PRESENT VARIABLE INFORMATION</topic><topic>CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS</topic><topic>CRYPTOGRAPHY</topic><topic>DISPLAY</topic><topic>EDUCATION</topic><topic>ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR</topic><topic>ELECTRICITY</topic><topic>MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS</topic><topic>PHYSICS</topic><topic>PRINTED CIRCUITS</topic><topic>SEALS</topic><toplevel>online_resources</toplevel><creatorcontrib>MOMOSE SHIGERU</creatorcontrib><creatorcontrib>NAKAJO KOICHI</creatorcontrib><creatorcontrib>OKADA SHIGEAKI</creatorcontrib><collection>esp@cenet</collection></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>MOMOSE SHIGERU</au><au>NAKAJO KOICHI</au><au>OKADA SHIGEAKI</au><format>patent</format><genre>patent</genre><ristype>GEN</ristype><title>LIGHT EMITTING DIODE DRIVING CIRCUIT</title><date>1997-08-15</date><risdate>1997</risdate><abstract>PROBLEM TO BE SOLVED: To enable use of electrically conductive material having large resistivi ty as an electrically conductive material to be formed in a flexible printed circuit board by impressing the voltage obtained by boosting a system voltage on light emitting diodes while connecting the light emitting diodes in series and driving the light emitting diodes with a constant current. SOLUTION: In a light emitting diode driving circuit, in lighting a liquid crystal display, a transistor Q2 is controlled to be in an operating state and the output voltage from a voltage boosting circuit 21 is impressed on one end of serially connected light emitting diodes 11-14. The constant current of 7mA is made to flow into a constant current circuit 22 and the constant current made to flow into the constant current circuit 22 is made to flow in the light emitting diodes 11-14 and they are made to emit lights. In this case, the serially connected light emitting diodes 11-14 are driven with the constant current of 7mA. Thus, the variation of brightness in lighting is eliminated in spite of the variation of resistivities of electrically conductive material 32.</abstract><edition>6</edition><oa>free_for_read</oa></addata></record> |
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| subjects | ADVERTISING ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICESUSING STATIC MEANS TO PRESENT VARIABLE INFORMATION CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS CRYPTOGRAPHY DISPLAY EDUCATION ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR ELECTRICITY MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS PHYSICS PRINTED CIRCUITS SEALS |
| title | LIGHT EMITTING DIODE DRIVING CIRCUIT |
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