APPARATUS FOR DRIVING CAPACITIVE LIGHT EMITTING DEVICE

• US 20110006692A1
• Filed: 03/05/2009
• Published: 01/13/2011
• Est. Priority Date: 03/26/2008
• Status: Abandoned Application

• Current Assignee: Sanken Electric Company Limited
• Original Assignee: Sanken Electric Company Limited
• Inventors: Osaka, Shohei, Washiya, Satoru, Ehara, Toshihiro
• Application Number:
  US12/920,368
• Publication Number:
  US 20110006692A1
• Time in Patent Office: Days
• US Class Current: 315/185.R
• CPC Class Codes: H05B 44/00 Circuit arrangements for operating electroluminescent light sources for operating light emitting diodes H05B45/00
• CPC Class Codes: H10K 59/84 Parallel electrical configurations of multiple OLEDs
• CPC Class Codes: H10K 59/86 Series electrical configurations of multiple OLEDs
• CPC Class Codes: Y02B 20/30 Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Abstract

A capacitive light emitting device includes: a capacitive light emitting device 1 placed between a cathode electrode and an anode electrode opposite to each other on a light-transmitting substrate; a power supply Vin connected to the capacitive light emitting device; drive means 10 for driving the capacitive light emitting device by applying a DC voltage of the power supply between the cathode electrode and the anode electrode; and regeneration means L2, Q3 for returning electric charges to the power supply for regeneration, the electric charges being accumulated in a parasitic capacitance of the capacitive light emitting device while the capacitive light emitting device is driven.

Claims

1. An apparatus for driving a capacitive light emitting device, comprising:

a capacitive light emitting device placed between a cathode electrode and an anode electrode opposite to each other on a light-transmitting substrate;

a power supply connected to the capacitive light emitting device;

drive means for driving the capacitive light emitting device by applying a DC voltage of the power supply between the cathode electrode and the anode electrode; and

regeneration means for returning an electric charge to the power supply for regeneration, the electric charge being accumulated in a parasitic capacitance of the capacitive light emitting device while the capacitive light emitting device is driven.

2. The apparatus for driving a capacitive light emitting device according to claim 1, wherein:

the capacitive light emitting device is provided in plurality; and

the plurality of capacitive light emitting devices are connected together in series or in parallel.

3. The apparatus for driving a capacitive light emitting device according to claim 1, wherein:

the capacitive light emitting device includes a plurality of light emitting layers made of organic substances placed between the cathode electrode and the anode electrode, the organic substances are laminated together by use of a separation layer having an electrical conductivity and a light transmitting property; and

each or all of the plurality of separated light emitting layers emit light.

4. An apparatus for driving a capacitive light emitting device, comprising:

a capacitive light emitting device placed between a cathode electrode and an anode electrode opposite to each other on a light-transmitting substrate;

a power supply connected to the capacitive light emitting device;

drive means for driving the capacitive light emitting device by applying a DC voltage of the power supply between the cathode electrode and the anode electrode; and

regeneration means being connected to the capacitive light emitting element, and including a reactor, a rectifier and a drive element,

wherein the regeneration means turns on the drive element to accumulate in the reactor an electric charge which is accumulated in a parasitic capacitance of the capacitive light emitting device while the capacitive light emitting device is driven;

thereafter causes the rectifier to apply a reverse voltage, which is equal to or less than a reverse breakdown voltage of the capacitive light emitting device, to the capacitive light emitting device; and

turns off the drive element to return the electric charge, which is accumulated in the reactor, to the power supply for regeneration.

5. The apparatus for driving a capacitive light emitting device according to claim 4, wherein:

the light emitting device is provided in plurality; and

the plurality of capacitive light emitting devices are connected together in series or in parallel.

6. The apparatus for driving a capacitive light emitting device according to claim 4, wherein:

the capacitive light emitting device includes a plurality of light emitting layers made of organic substances placed between the cathode electrode and the anode electrode, the organic substances are laminated together by use of a separation layer having an electrical conductivity and a light transmitting property; and

each or all of the plurality of separated light emitting layers emit light.

7. The apparatus for driving a capacitive light emitting device according to claim 4, characterized in that:

the drive means drives the capacitive light emitting element with a first pulse signal; and

the control circuit turns on and off the drive element with a second pulse signal, one pulse of the second pulse signal being outputted per output of every two or more pulses of the first pulse signal.