Title:
A control device of a light emitting diode which has a dynamic range of very big luminosity for display screens
Document Type and Number:
Japanese Patent JP6057366
Kind Code:
B2
Abstract:
The general field of the invention is that of devices for controlling luminance of lighting devices comprising light-emitting diodes. The control device is driven by a cyclic input signal of determined period, each period comprising an activation time representative of a determined luminance level. The control device comprises analog electronic means generating a second control signal for the intensity of the electric current passing through the light-emitting diodes, the amplitude of the second control signal being an increasing function of the activation time in such a way that the combination of the cyclic input signal and of the second signal applied to the light-emitting diodes gives a greater luminance range than the range of the cyclic input signal.
Inventors:
Show, Guy
Renault, Frederick
Renault, Frederick
Application Number:
JP2012125568A
Publication Date:
January 11, 2017
Filing Date:
June 01, 2012
Export Citation:
Assignee:
Tales
International Classes:
H05B37/02; G02F1/13357; H05B44/00
Domestic Patent References:
| JP2008047494A | ||||
| JP2005267999A | ||||
| JP2006526886A |
Foreign References:
| US6987787 | ||||
| US20090079357 |
Attorney, Agent or Firm:
Takahisa Kimura
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