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Wide color gamut backlight source for display of LED combined with perovskite quantum dot glass-ceramics

A technology of glass-ceramics and quantum dots, which is applied in the field of backlight, can solve the problems of performance aging, narrow luminous spectrum, and low lifespan, and achieve the effect of performance improvement and high luminous quantum efficiency

Active Publication Date: 2019-12-03
DALIAN MARITIME UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Similarly, the combination of phosphor powder and silica gel is prone to performance aging problems, and may also cause color deviation due to the different degrees of performance degradation of red phosphor powder and green phosphor powder.
[0005] 3. Blue LED chips combined with II-VI groups such as CdSe / ZnS or III-V group core-shell structure quantum dot crystal powders and thin films such as InP / ZnS: This technical solution has been mass-produced in a small amount, and the advantage is that it can improve the color gamut. It reaches the NTSC standard of 105%, but the light efficiency is poor, and the core-shell structure needs to be made, and the environmental stability and mechanical stability are very poor. It needs special anti-humidity and anti-oxidation treatment, which is prone to quantum dot displacement and has a short service life enough
[0006] 4. Perovskite CsPbX 3 (X=Cl,Br,I) quantum dot glass and its derivative CsPb(Cl x Br 1-x ) 3 and CsPb(Br x I 1-x ) 3 The quantum dot crystal powder and film have the advantages of adjustable luminescence wavelength in the visible light range, narrow and symmetrical luminescence spectrum, high luminescence quantum efficiency, short luminescence life, simple process, and low cost, but its environmental stability and mechanical stability are very poor. Poor, the luminous performance is significantly reduced in the air and humid heat environment, and it is easy to cause the quantum dot position to move
The better lifespan of QLED is 20,000-30,000 hours, which is still slightly lower, and during this lifespan, its light efficiency will gradually decay, which will cause a decrease in display performance

Method used

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  • Wide color gamut backlight source for display of LED combined with perovskite quantum dot glass-ceramics
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  • Wide color gamut backlight source for display of LED combined with perovskite quantum dot glass-ceramics

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Embodiment 1

[0046] figure 2It is a schematic diagram of three applications of LED quantum dot glass-ceramic side-entry backlight in the present invention, wherein (a) is perovskite quantum dot glass-ceramic packaged on the LED chip, (b) is the LED of (a) and The enlarged view of the quantum dot glass, (c) is the perovskite quantum dot glass ceramics packaged on the side of the light guide plate, (d) is the enlarged view of the quantum dot glass in (c), (e) is the perovskite quantum dot micro The crystal glass is packaged on the back surface of the light guide plate, and (f) is an enlarged view of the quantum dot glass in (e). The side-lit backlight includes perovskite quantum dot glass-ceramic 1, blue LED 2, light guide plate 3 and reflector 4. It is required to generate red, green and blue three-color mixed light, and then pass liquid crystal light on each pixel. Valves and color filters work together to control the ratio of output red, green, and blue light.

[0047] Such as figure...

Embodiment 2

[0049] image 3 It is a schematic diagram of the application of LED quantum dot glass-ceramic direct-lit backlight in the present invention. Such as image 3 As shown, the direct-type backlight includes blue LED2, reflector 4, green perovskite quantum dot glass-ceramic 5, red perovskite quantum dot glass-ceramic 6, diffusion film 7, brightness enhancement film 8, double-increasing The bright film 9 and the LCD panel 10 with built-in color filters are required to generate red, green and blue three-color mixed light, and then control the output of red light, The ratio of green light to blue light.

[0050] Such as image 3 As shown, the direct-type backlight is suitable for perovskite quantum dot glass-ceramic 1 to be packaged on the LED chip. In order to prevent performance degradation caused by temperature rise, a reasonable thermal design is required. LED chip and green perovskite quantum-dot glass-ceramic There can be a certain distance between 5 and the glass-ceramics 6...

Embodiment 3

[0052] Figure 4 It is a schematic diagram of field sequence LED backlight application of perovskite quantum dot glass-ceramics in the present invention, wherein (a) is a blue LED combined with red perovskite quantum dot glass-ceramics and green perovskite quantum dot crystallite Schematic diagrams of red light, green light and blue light produced by glass and blue LED itself, respectively. Schematic diagrams of perovskite quantum dot glass-ceramics respectively generating red, green and blue light for field sequential display. (c) is a schematic diagram of sequentially flashing red, green and blue light to form a video field in field sequential applications. The field sequential LED backlight includes blue LED2, green perovskite quantum dot glass-ceramics 5, red perovskite quantum dot glass-ceramics 6 and blue perovskite quantum dot glass-ceramics 11, where the blue LED2 can also be LEDs shorter than the quantum dot absorption cutoff wavelength. Such as Figure 4 As shown ...

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Abstract

The invention provides a wide color gamut backlight source for display of LED combined with perovskite quantum dot glass-ceramics, and is used for providing a light source for the displayer. The backlight source comprises the LED and the perovskite quantum dot glass-ceramics. The perovskite quantum dot glass-ceramics comprises red light, green light and blue light perovskite quantum dot glass-ceramics. The perovskite quantum dot glass-ceramics material is CsPbX3 (X=Cl, Br, I) or CsPb (ClxBr1-x) 3 or CsPb (BrxI1-x) 3. The backlight source spectrum contains its own blue light component of the blue LED, the narrow linewidth green light component produced by exciting CsPbBr3 or CsPb (BrxI1-x) 3 quantum dot glass-ceramics by the blue LED and the narrow linewidth red light component produced byexciting CsPbI3 or CsPb (BrxI1-x) 3 quantum dot glass-ceramics by the blue LED. The backlight source spectrum can also contain the narrow linewidth blue light component produced by exciting the blue light CsPb (ClxBr1-x)3 quantum dot glass-ceramics by the short wavelength LED of which the wavelength is less than the absorption cutoff wavelength of the quantum dot, the narrow linewidth green lightcomponent produced by exciting the CsPbBr3 or CsPb (ClxBr1-x)3 quantum dot glass-ceramics by the short wavelength or blue LED and the narrow linewidth red light component produced by exciting the CsPbI3 or CsPb (ClxBr1-x)3 quantum dot glass-ceramics by the short wavelength or blue LED.

Description

technical field [0001] The invention relates to the technical field of backlight sources, in particular to a wide color gamut backlight source for display in which LEDs are combined with perovskite quantum dot glass-ceramics. Background technique [0002] At present, the main technologies and their advantages and disadvantages of wide color gamut backlight for display are as follows: [0003] 1. Blue LED chips combined with Ce 3+ : YAG yellow phosphor technology. This is an existing mass-produced technology with a high degree of technical maturity, but its disadvantages are insufficient red and green light components, and a low color gamut, which only meets 72% of the color gamut standard of the National Television Standards Committee (NTSC), and cannot meet wide-bandwidth requirements. Application of color gamut display. The combination of phosphor powder and silica gel is also prone to performance aging problems. [0004] 2. Blue light, purple light or near ultraviolet...

Claims

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Application Information

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IPC IPC(8): H01L33/50H01L25/075H01L33/48
CPCH01L25/0753H01L33/483H01L33/502
Inventor 张希珍陈宝玖于涛
Owner DALIAN MARITIME UNIVERSITY
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