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LED unit and application thereof

A technology of LED chips and phosphors, which is applied in electrical components, optics, instruments, etc., can solve the problems of human eye damage, inconsistent life needs, low color saturation, etc., and achieve good saturation, low power intensity, and blue light. The effect of low content

Inactive Publication Date: 2021-02-05
陈志云
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The mainstream way to achieve white light is to excite phosphor powder through blue chips (LEDs), but this also makes the blue light content in the white light spectrum relatively high, and the excessive blue light content will cause irreversible damage to the human eye, which is different from people's vision. Life needs do not meet
In this regard, the industry generally uses software to control the twist angle of the liquid crystal molecules in the LCD screen to control the transmission of blue light in the spectrum. Although this method can filter out part of the blue light in the white light, it will correspondingly lose the brightness of the white light. Causes the display interface to turn yellow, the color saturation is low, and the actual color cannot be well restored

Method used

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  • LED unit and application thereof
  • LED unit and application thereof
  • LED unit and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] refer to figure 1 , shows a schematic structural view of an LED unit of the present invention. The LED unit includes an LED bracket and an LED chip 120 fixed on the LED bracket. The LED bracket includes an insulating substrate 100 and a negative electrode pad 111, an insulating part 112 and an anode pad 113 located below the insulating substrate 100. The insulating substrate 100 is a hollow ring. structure, and the negative electrode pad 111, the insulating part 112 and the positive electrode pad 113 form a hollow bowl-shaped die-bonding cavity, and the LED chip 120 is fixed on the negative electrode pad 111 and located in the bowl-shaped die-bonding cavity. In addition, phosphor powder 130 is also fixed in the bowl-shaped crystal-bonding cavity.

[0035] The LED chip 120 of the LED unit has a peak wavelength of 455nm to 460nm, and the fluorescent powder is formed by mixing the first fluorescent powder, the second fluorescent powder and glue with a volume ratio of 2:1,...

Embodiment 2

[0043] The laser power of the LED unit prepared in Example 1 is measured, and the measurement standard refers to IEC 60825-1:1993 and relevant revised documents A1:1997 and A2:2001. The results are shown in Table 1.

[0044] Table 1. Test Results

[0045]

[0046]

[0047] a) retinal photochemical hazard b) retinal thermal hazard

[0048] It can be seen from the above results that the LED unit provided by the embodiment of the present invention has a good anti-blue light effect, and the content of blue light in the mixed white light is relatively low.

Embodiment 3

[0050] Take the commercially available white light LED and the LED unit provided in Example 1, supply power through an independent power supply, and measure the relative spectral energy distribution of the two with a spectrophotometer after they are lit. The results are shown in Table 2.

[0051] Table 2. Relative Spectral Power Distribution

[0052]

[0053] It can be seen from the test results in the table that the energy ratio of the wavelength range of 415-455nm in the entire range of visible light wavelengths of 380-780nm is far lower than that of commercially available conventional white LEDs in Example 1. It can be seen that the LED provided in this embodiment can effectively Reduce the damage of blue light in the spectrum to human eyes.

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Abstract

The invention discloses an LED unit and application thereof. The LED unit comprises an LED chip, first fluorescent powder and second fluorescent powder, the peak wavelength of the LED chip ranges from455 nm to 460 nm, the excitation wavelength of the first fluorescent powder ranges from 520 nm to 545 nm, the excitation wavelength of the second fluorescent powder ranges from 620 nm to 650 nm, andthe first fluorescent powder and the second fluorescent powder are located in the light emitting direction of the LED chip. According to the embodiment of the invention, the LED unit at least has thefollowing beneficial effects: the peak wave band of the blue-light LED chip adopted by the embodiment of the invention is 455-460nm, and compared with the wave band of the conventional chip, the powerintensity is lower, the blue-light radiation dosage is smaller; and therefore, the content of blue light in white light obtained by mixing chip emitting light and fluorescent powder exciting light islower. Meanwhile, the green fluorescent powder and the red fluorescent powder with specific excitation wavelengths are combined, so that the saturation degree of white light obtained by mixing is better.

Description

technical field [0001] The invention relates to the technical field of liquid crystal display, in particular to an LED unit and its application. Background technique [0002] Compared with the traditional cold cathode tube (CCFL), LED has the characteristics of small size, long life, good reliability, energy saving and environmental protection. LED backlight uses LEDs as the backlight of liquid crystal display screens, and the liquid crystal display screens produced have the advantages of bright colors and high brightness, so that the share of LED display screens in liquid crystal display products continues to expand. Most of the current liquid crystal displays are color displays, and the LED backlight needs to emit light with white light covering the most colors. The mainstream way to achieve white light is to excite phosphor powder through blue chips (LEDs), but this also makes the blue light content in the white light spectrum relatively high, and the excessive blue ligh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L33/50G02F1/13357
CPCG02F1/133603H01L33/504H01L2933/0041
Inventor 陈志云
Owner 陈志云
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