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Light emitting device

A technology for light-emitting devices and light-emitting colors, applied in lighting devices, electroluminescent light sources, light sources, etc., can solve the problems of complex lighting systems and increased costs, and achieve the effect of reducing area and small voltage difference

Pending Publication Date: 2019-11-29
ZIGEN LIGHTING SOLUTION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the method of using independent circuits to drive LEDs that emit different luminous colors has the disadvantages of requiring an input signal to a processor, controlling the current values ​​of multiple circuits according to the desired luminous colors, and having to detect the required LEDs. Emit color and apply feedback control etc. as lighting system becomes complicated and costly

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0044] Such as figure 1As shown in the wiring diagram of the light-emitting device 100, the light-emitting device 100 is a COB type, a single light-emitting part 2 is formed on the substrate 1, and an LED device array formed by electrically connecting LED devices L1a to L1d is arranged inside the light-emitting part 2 The LED device array L2 in which L1 and LED devices L2 a and L2 b are electrically connected is connected in series between electrode lands 41 and 42 through wiring 51 . A bypass circuit 8 composed of a resistor 6, a Zener diode 7, and a wiring 52 is connected in parallel to the LED device array L1.

[0045] Such as figure 2 As shown in the top view of the light-emitting device 100, the light-emitting part 2 has a resin dam 3 on the outer periphery, and is composed of a light-emitting region 21 including the LED device array L1 and a light-emitting region 22 including the LED device array L2 covered by a translucent resin. 21 and the light-emitting region 22 e...

no. 2 approach

[0094] Such as Figure 6 As shown in the wiring diagram of the light-emitting device 300, a single light-emitting portion 302 is formed on the substrate 301, and an array L5 composed of LED devices L5a to L5c and an array L6 composed of LED devices L6a to L6c are arranged inside the light-emitting portion 302. , the LED device arrays L5 and L6 are connected in parallel through the wiring 351 between the electrode pads 341 and 342 . Similar to the first embodiment, the LED devices L5a and L6a are connected in parallel to the bypass circuit 308a including the resistor 306a and the Zener diode 307a on the wiring 352a, respectively, and the LED devices L5c and L6c are also connected in parallel to the bypass circuit 308c in the same manner. .

[0095] In this embodiment, since the LED devices connected in parallel with the bypass circuits 308a and 308c are single-connected in series, the Zener diodes 307a and 307c of the bypass circuits do not require a high voltage, and ordinary...

no. 3 approach

[0104] Such as Figure 8 As shown in the wiring diagram of the light-emitting device 400, a single light-emitting portion 402 is formed on the substrate 401, and LED device arrays L7, L8, L9, and L10 are arranged inside the light-emitting portion 402, and the LED device arrays L7 and L10 are arranged in the same number The LED device arrays L8 and L9 are connected in parallel with the same number of LED devices in series, and the LED device arrays L7 and L10 and the LED device arrays L8 and L9 are electrically connected in series between the electrode pads 441 and 442 connect. Similar to the first embodiment, a bypass circuit 408 including a resistor 406 and a Zener diode 407 on the wiring 452 is connected in parallel to the LED device arrays L7 and L10 .

[0105] Such as Figure 9 As shown in the top view, the light-emitting part 402 has a resin dam 403 on the outer periphery, consisting of a light-emitting area 421 including the LED device array L7, a light-emitting area 4...

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Abstract

According to the present invention, a light emitting device is provided with a first LED element array and a second LED element array, each of which is composed of one or more LED elements; the firstLED element array and the second LED element array are connected in series with each other; at least one LED element array is connected in parallel with a bypass circuit that comprises a resistor anda diode; the threshold voltage of the LED element array connected in parallel with the bypass circuit is higher than the threshold voltage of the diode; and the emission color of light emitted by thefirst LED element array is different from the emission color of light emitted by the second LED element array.

Description

technical field [0001] The present invention relates to a light emitting device and a lighting device, and more particularly to a light emitting device and a lighting device that use LEDs and whose light emission color changes according to an input current. Background technique [0002] Compared with conventional light sources, light-emitting devices using light-emitting diodes (LEDs) directly convert the applied power into light, so the luminous efficiency is very high, and they are used in many lighting devices in recent years. [0003] In the past light sources, especially incandescent lamps, halogen lamps, etc., the color temperature of the white light emitted becomes lower according to the reduction of input power, and the feeling of yellowish and reddish increases. People feel that this color change is comfortable and natural. Furthermore, incandescent lamps and halogen lamps have a single light-emitting source, and a single light-emitting source in which the color of ...

Claims

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Application Information

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IPC IPC(8): H01L33/00H01L33/48H05B37/02H05B44/00
CPCH05B45/20H05B45/44H05B45/3577H01L25/167H05B45/48
Inventor 名田智一
Owner ZIGEN LIGHTING SOLUTION CO LTD
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