Edge-lit backlight based on dual-chip dual-circuit connected LED lamp bead

Abstract

The invention discloses an edge-lit backlight based on a dual-chip dual-circuit connected LED lamp bead. A high color gamut LED lamp bead with a first chip and a second chip matching a phosphor is used, the high color gamut is relatively high and is up to 100% to 120%. Meanwhile, only one phosphor is required to be excited so the target performance of the product is more easily controlled. The structure using the dual chip with the phosphor is simpler than the R, G and B three-color LED, and is technically easier to achieve. Compared with a quantum dot film and a quantum dot tube, the structure of the dual-chip with the phosphor also has the advantages of good stability, low cost and the like while achieving high color gamut. Moreover, the dual-circuit connected dual-chip is controlled bythe dual-power supply, and by adjusting the current of the dual color chip, the light attenuation of the blue and green chips can be consistent, so that the stability of the lamp bead is better.

Description

technical field [0001] The invention belongs to the technical field of LED backlights, and relates to a side-entry backlight, in particular to a side-entry backlight based on double chips and double circuits connected to LED lamp beads. Background technique [0002] Since entering the 21st century, LED backlight technology has become the mainstream of the market through continuous development and innovation. At present, there are three main technical methods to realize white light: 1. blue LED chip with yellow phosphor, blue chip with red and green phosphor; 2. ultraviolet or violet LED chip with red, green and blue phosphor; 3. The red, green and blue LED chips directly mix light. The current mainstream method is to mix red, green or yellow phosphors with encapsulation glue, and then apply them on the blue chip to form white light through light color combination. The NTSC color gamut value can reach 72%-95%. [0003] However, with the rapid development of LED backlight t...

AI Technical Summary

Problems solved by technology

[0005] ①The current commercial phosphors are mostly YAG powder or silicate phosphor, nitride phosphor, fluoride phosphor, KSF phosphor, β-SiAl ON, and the color gamut can only reach 72%-93%;

[0006] ②The excitation efficiency of phosphor is low, and the improvement of color gamut can only be achieved by increasing the dosage, which is far from meeting the requirements of today's society for lower energy consumption, higher energy efficiency and higher color gamut, and the color purity of red phosphor is not high , the NTSC color gamut value can never break through 100%;

[0007] ③R, G, B three-color LED chips are difficult to mix light, and there are also problems with heat dissipation, and the drive control system is more complicated;

[0008] ④Current commercial quantum dot materials are easily affected by temperature and humidity and lead to failure. At the same time, due to the complex preparation process of quantum dots, low output, poor stability, and high price, they have not been fully popularized;

[0009] ⑤Using two-color chips in series with phosphor powder, the light mixing effect will be poor, and because the light decay of the two-color chips is inconsistent, it will lead to the color shift of the LED lamp bead

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