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Patent Searching and Data


Title:
LED DISPLAY DEVICE
Document Type and Number:
Japanese Patent JP2001083939
Kind Code:
A
Abstract:

To provide an LED display device capable of preventing mis-operation of a driving circuit by reducing a spike noise generated on a power source line at the switching time between the ON and OFF states of LED's, capable of reducing also a radiation noise, and capable of fitting to a legal regulation concerning EMC by also reducing a radiation noise.

This device is equipped with a display part board 2 on which many LED's 2a of each pixel unit facing to the front are arranged, and a circuit part board 3 on which circuit parts arranged on the back side of the display part board 2 at intervals, and conductive to the LED's 2a, are formed. The circuit part is equipped with a power source connector 5 connected to an external power source, a main capacitor 6 arranged near the power source connector 5, and one or more sub-capacitors 7, 8, 9 arranged on the end of a conduction path to the LED's 2a, and a noise voltage in the circuit is smoothed by charge and discharge actions of the main capacitor 6 and the sub-capacitors 7, 8, 9.


Inventors:
KAWAHARA HISAKAZU
Application Number:
JP26213199A
Publication Date:
March 30, 2001
Filing Date:
September 16, 1999
Export Citation:
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Assignee:
MATSUSHITA ELECTRIC IND CO LTD
International Classes:
G09G3/32; G09F9/33; G09F13/20; G09G3/20; (IPC1-7): G09G3/32; G09F9/33; G09F13/20
Attorney, Agent or Firm:
Fumio Iwahashi (2 others)