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AC light-emitting device

A light-emitting device, AC input technology, applied in lighting devices, lighting device parts, light sources, etc., can solve the problem of increasing the degree of flickering of diode microcrystals, increasing the degree of flickering, affecting the degree of flickering of light-emitting diode microcrystals, etc. question

Inactive Publication Date: 2009-06-24
EPISTAR CORP
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  • Summary
  • Abstract
  • Description
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Problems solved by technology

[0006] Depend on Figure 1A and Figure 1B It can be known that the power factor of the LED micro-crystals powered by the AC power supply must be less than 1, and when the initial voltage is too high, the proportion of the LED micro-crystals that do not emit light will increase, so the degree of flickering will decrease. will get bigger
In addition, the frequency of the input voltage provided by the AC power supply will also affect the flickering degree of the LED microcrystals. When the frequency of the input voltage is too low, the flickering degree of the LED microcrystals will also increase.

Method used

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Embodiment Construction

[0038] figure 2 It is an embodiment of the AC light emitting device in the present invention. The AC light emitting device 100 includes an AC LED module 10 coupled to an input voltage VS provided by an AC power source 20 , and a waveform modulation unit 14 . The AC LED module 10 includes a plurality of diode microchips 12 formed on a substrate (not shown in the figure), and connected into at least two strings (two groups) by wires on the substrate. In addition, the diode microchip 12 is a light-emitting component whose operating power can be adjusted according to different operating voltages. For example, the diode microchips 12 can be micro-light emitting diodes (micro LEDs) or laser diode microchips (micro-laser diodes (micro LDs), but not limited thereto. Generally speaking, the AC light-emitting device is encapsulated in a packaging structure, and the packaging structure contains phosphor powder, which can mix the light emitted by the microcrystalline particles into oth...

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Abstract

Disclosed is an alternating current lightening device, which comprises an AC LBD module and a waveform modulation unit; wherein, the AC LBD is provided with at least two groups of diode microcrystallites, and the waveform modulation unit is coupled between the AC LBD module and an AC input voltage and used for modulating the waveform of the AC input voltage.

Description

technical field [0001] The invention relates to a light-emitting device, in particular to an AC light-emitting device using light-emitting diode microcrystals. Background technique [0002] Lighting technology using light-emitting diodes (LEDs) has become a very important development direction for the lighting industry and the semiconductor industry in the future due to its durability, long life, light weight, low power consumption, and no harmful substances such as mercury. In general, light emitting diodes are widely used in white light lighting devices, indicator lights, vehicle signal lights, vehicle headlights, flashlights, backlight modules of liquid crystal displays, light sources of projectors, outdoor display units, etc. [0003] Figure 1A It is a waveform diagram of input voltage and current in a diode light emitting device. Since the operating voltage (withstand voltage) of each light-emitting diode microcrystal is only about 2-5V, multiple diode microcrystals n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02F21V23/00F21V9/08F21Y101/02F21Y113/00
Inventor 戴晟杰叶文勇
Owner EPISTAR CORP
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