Method and device for brightness compensation in an led
AssigneeInova Semiconductors GmbH
InventorRoland Neumann
Life of this patent
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Abstract
The present invention is directed to a method for brightness compensation in at least one light emitting diode. The proposed method achieves an always constant brightness of an LED irrespective of temperature fluctuations. The invention is further directed to a respectively configured device as well as a memory module for use in the proposed method.
Claims14
A method for brightness compensation of several light-emitting diodes (LED) depending on a temperature value, the method comprising the steps of:
- measuring of the temperature value with respect to a plurality of light-emitting diodes (LED), wherein several sensors are provided at several measuring locations for measuring of the temperature value and the temperature value is an averaged value of several measured single temperature values, wherein at each light-emitting diode (LED) one sensor is provided and a time interval is defined, specifying how long the temperature value is measured at the light-emitting diode (LED);
- reading out a current value from several current values stored in a memory module, which current value is assigned to the measured temperature value, wherein the read-out current value is assigned to a temperature interval into which the measured temperature value falls;
- and
- controlling of at least one current controller of a respective light-emitting diode (LED) based on the read-out current value.
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A device for brightness compensation of several light-emitting diodes (LED) depending on a temperature value, comprising:
- several sensors configured for measuring the temperature value regarding a plurality of light-emitting diodes (LED) at several measuring locations, wherein the temperature value is an averaged value of several measured single temperature values, wherein at each light-emitting diode (LED) one sensor is provided and a time interval is defined, specifying how long the temperature value is measured at the light-emitting diode (LED);
- an interface component configured for reading out a current value from several stored current values from a memory module, which current value is assigned to the measured temperature value, wherein the read-out current value is assigned to a temperature interval into which the measured temperature value falls;
- and
- a current controller configured for controlling at least one light-emitting diode (LED), respectively, by means of the read-out current value.
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Dependencies are inferred from the claim text.