Backlight module and display device

A backlight module and light source technology, applied in the optical field, can solve the problems of poor brightness uniformity and chromaticity uniformity, and achieve the effect of improving brightness and chromaticity uniformity and reducing leakage

Inactive Publication Date: 2016-02-24

NANJING TECH CORP LTD

11 Cites 26 Cited by

AI-Extracted Technical Summary

Problems solved by technology

[0007] The main purpose of the present invention is to provide a backlight module and a display device to solve...

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Method used

1. The light conversion layer is arranged on at least one light leakage surface of the light guide plate, and the color of the outgoing light emitted from at least one light leakage surface is changed to white through color complementation, effectively reducing the blue light in the backlight module leakage of

Above-mentioned quantum dot is made of carbon, silicon, germanium, tin, lead, cadmium, zinc, sulfur, selenium, tellurium, boron, aluminum, gallium, indium, nitrogen, phosphorus, arsenic, antimony, chlorine, bromine, iodine, A nano-semiconductor material composed of any one or more elements of potassium, rubidium, and cesium; the above-mentioned non-quantum dot fluorescent material can be a fluorescent powder commonly used in the prior art. Those skilled in the art can choose non-quantum dot fluorescent materials and quantum dots according to the wavelength of light emission, so as to achieve the effect of making the emitted light complementary to white. For example, when the light source is blue, you can choose red-green phosphor, yellow phosphor, red phosphor Green quantum dots and/or yellow quantum dots, but not limited to combinations of the foregoing. The above-mentioned quantum dot and/or non-quantum dot fluorescent material is used to complement blue light into white, thereby avoiding the problem of blue light leakage, thereby improving the brightness and chromaticity uniformity of the backlight module.

In the above-mentioned backlight module, since the light conversion layer is arranged on at least one light leakage surface of the light guide plate, the color of the outgoing light emitted from at least one light leakage surface can be changed to white through color complementation, thereby effectively The leakage of blue light in the backlight module is reduced, and because the reflective layer is only set corresponding to the second light-emitting surface, most of the white light is directly emitted from the light conversion layer without returning to the light guide plate for transmission, ensuring that the light from the light guide plate Most of the light emitted from the first light emitting surface of the backlight is blue light, and the blue light is further converted into white light, thereby improving the brightness and chromaticity uniformity of the backlight module.

[0029] In the above-mentioned backlight module of the present invention, the above-mentioned light conversion layer 20 can also be an adhesive layer provided with a light conversion material, and the light conversion material includes quantum dots and/or non-quantum dot fluorescent materials. Since quantum dots and non-quantum dot fluorescent materials can convert blue light into white light, by disposing the light conversion layer 20 with quantum dots and/or non-quantum dot fluorescent materials on the light leakage surface, the light from the light guide plate 30 can be effectively The blue light in the light emitted from the first light-emitting surface is converted into white light, thereby avoiding the problem of blue light leakage.

[0033] Preferably, the thickness of the light conversion layer 20 is 10-200 μm. If the thickness of the light conversion layer 20 is large, the size of the backlight module will be large, and the content o...

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Abstract

The invention provides a backlight module and a display device. The backlight module comprises a light source, a light-guide plate and a reflection layer. The light-guide plate is provided with a light-incident surface, a first light-emitting surface, three light-leaking surfaces and a second light-emitting surface parallel to the first light-emitting surface. The light source and the light-incident surface are correspondingly arranged. The reflection layer and the second light-emitting surface are correspondingly arranged. The backlight module further comprises light conversion layers arranged on at least one light-leaking surface and used for converting emergent light emitted from at least one light-leaking surface to white light. As a result, the color of emergent light emitted from at least one light-leaking surface is turn into white through color complementation such that leakage of blue light of the backlight module is effectively reduced. It is ensured that a large amount of light emitted from the first light-emitting surface of the light-guide plate is blue light. Blue light is further converted into white light so that luminance and color uniformity of the backlight module are improved.

Application Domain

Planar/plate-like light guidesNon-linear optics

Technology Topic

Light guideDisplay device +1

Image

Examples

Experimental program(4)
Comparison scheme(2)
Effect test(1)

Example Embodiment

[0038] Example 1

[0039] The backlight module provided by this embodiment includes a blue light source, a light guide plate, and a reflective layer. The light guide plate has a light incident surface, a first light exit surface, three light leakage surfaces, and a second light exit surface parallel to the first light exit surface. The light incident surface of the light plate is correspondingly arranged, and the reflective layer is arranged correspondingly to the second light exit surface of the light guide plate. The backlight module further includes a light conversion layer arranged on a light leakage surface. The light conversion layer includes a light conversion material. The material is CdSe/ZnS core-shell quantum dots, the base material of the light conversion layer is polyacrylate, the particle size of the quantum dots is 10nm, the weight percentage of the quantum dots in the light conversion layer is 8%, and the thickness of the light conversion layer is 200μ0. And the thickness of the light guide plate is 4mm.

Example Embodiment

[0040] Example 2

[0041] The backlight module provided in this embodiment has the following differences from Embodiment 1, and the others are the same as Embodiment 1:

[0042] The light conversion layer is arranged on each light leakage surface, the light conversion material in the light conversion layer is YAG phosphor, the base material of the light conversion layer is silica gel, the weight percentage of the phosphor in the light conversion layer is 8%, and the weight percentage of the light conversion layer is 8%. The thickness is 200 μ0, and the thickness of the light guide plate is 4 mm.

Example Embodiment

[0043] Example 3

[0044] The backlight module provided in this embodiment has the following differences from Embodiment 1, and the others are the same as Embodiment 1:

[0045] The light conversion layer is arranged on each light leakage surface, the particle size of the CdSe/ZnS core-shell quantum dots is 10nm, the weight percentage of the quantum dots in the light conversion layer is 15%, the thickness of the light conversion layer is 100, and the light guide plate The thickness is 1mm.

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PUM

Property	Measurement	Unit
Thickness	10.0 ~ 200.0	µm
Thickness	<= 1.0	mm
Particle size	10.0	nm
tensile		MPa
Particle size		Pa
strength	10

Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

Improve brightness and color uniformity
Reduce leakage

High-brightness uniform-chroma projection system

ActiveCN105573032APrecise controlImprove brightness and color uniformityTelevision system detailsProjectorsProjection systemControl system

Owner:AVANZA

Backlight module and display device

A backlight module and light source technology, applied in the optical field, can solve the problems of poor brightness uniformity and chromaticity uniformity, and achieve the effect of improving brightness and chromaticity uniformity and reducing leakage

AI-Extracted Technical Summary

Problems solved by technology

Method used

Abstract

Image

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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