Electroluminescent device with sufficient luminous power and driving method thereof
AssigneeDenso Corporation
InventorsTakashi Inoue, Masayuki Katayama, Yutaka Hattori, Hirotaka Suzuki, Masahiko Osada, Yasuo Yamamoto, Tomoya Uchida
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Abstract
An EL device includes a control unit that controls a driving circuit so that a plurality of EL elements emits light several times per driving cycle. Specifically, when a driving voltage is applied to the plurality of EL elements, the plurality of EL elements emits several times per driving cycle. As a result, since the amount of light integrated per time increases, the plurality of EL elements obtains high luminous power even if a plurality of El elements having a very short emission decay time is used.
Claims65
An EL device comprising;
- a plurality of EL elements;
- a driving circuit for applying a driving voltage to both sides of each of the plurality of EL elements;
- and
- a control unit for controlling the driving circuit to drive the plurality of EL elements to emit light;
- wherein the control unit controls the driving circuit so that the plurality of EL elements emits light several times per driving cycle.
A driving device for driving a plurality of EL elements comprising;
- a driving circuit for applying a driving voltage to both sides of each of the plurality of EL elements;
- and
- a control unit for controlling the driving circuit to drive the plurality of EL elements to emit light;
- wherein the control unit controls the driving circuit so that the plurality of EL elements emits light several times per driving cycle.
A printer head comprising:
- a plurality of linearly arranged EL elements each having a luminous power that rapidly decays and a characteristic emission decay time less than 700 μs.
A driving device for driving a printer head including a plurality of EL elements comprising;
- a driving circuit for applying a driving voltage to both sides of each of the plurality of EL elements;
- and
- a control unit for controlling the driving circuit to drive the plurality of EL elements to emit light;
- wherein the control unit controls the driving circuit so that the plurality of EL elements emits light several times per driving cycle.
A method for driving an EL device comprising:
- applying a driving voltage to both sides of a plurality of EL elements by a control unit to cause each of the plurality of EL elements to emit light several times per driving cycle.
A method for driving a printer head including a plurality of EL elements as a light source comprising:
- applying a driving voltage to both sides of a plurality of EL elements by a control unit to emit the plurality of EL elements several times per driving cycle.
A printer head comprising:
- a plurality of linearly arranged EL elements each having a luminous power that rapidly decays and each comprising an inorganic EL element interposed between electrodes through insulation made of a material of which a relative dielectric constant is at least 1000.
A printer head comprising:
- a plurality of linearly arranged EL elements each having a luminous power that rapidly decays;
- a plurality of data electrodes;
- and
- a plurality of linearly arranged scanning electrodes, each of the plurality of scanning electrodes crosses each of the plurality of data electrodes once so that respective intersections thereof are linearly arranged, wherein
- each of the plurality of EL elements is located at the respective intersections between the plurality of scanning electrodes and the plurality of data electrodes so that the plurality of EL elements is linearly arranged for forming a printer head that is used as a light source of a luminescent printer.
Dependencies are inferred from the claim text.