CN210835516U

CN210835516U - Backlight module and display device

Info

Publication number: CN210835516U
Application number: CN201921714848.5U
Authority: CN
Inventors: 陈细俊; 邓天应; 许怀书
Original assignee: Huizhou Shiwei New Technology Co Ltd
Current assignee: Huizhou Shiwei New Technology Co Ltd
Priority date: 2019-10-12
Filing date: 2019-10-12
Publication date: 2020-06-23
Anticipated expiration: 2029-10-12

Abstract

The utility model discloses a backlight module and display device, backlight module includes: a back plate; a reflective sheet disposed on the back plate; a diffusion plate disposed above the reflection sheet; and an optical absorption layer disposed on the diffusion plate and/or the reflection sheet. The optical absorption layer with the function of absorbing red light and green light is designed on the diffusion plate or the reflection sheet to absorb the red light and the green light, so that the problem of color deviation caused by interference of the red light and the green light during local backlight modulation is solved, and the image quality display effect is improved.

Description

Backlight module and display device

Technical Field

The utility model belongs to the technical field of the display technology and specifically relates to a backlight module and display device.

Background

With the development of backlight display technology, a large number of products are now available on the market for updating. Competitors have unique innovative elements for the new generation of products. The core technology competition point of high-definition display becomes the common pursuit target of competitors in the modern display industry.

Multi-partition direct type quantum dot backlight and Local Dimming (LD) are the mainstream high-quality display technologies at present. However, the interference of red light and green light in the local division causes color shift, which results in poor image quality display effect.

Accordingly, the prior art is yet to be improved and developed.

SUMMERY OF THE UTILITY MODEL

In view of the above-mentioned prior art not enough, an object of the present invention is to provide a backlight module and a display device to solve the color deviation problem caused by interference of red light and green light, and improve the image quality display effect.

The technical scheme of the utility model as follows:

a backlight module includes:

a back plate;

a reflective sheet disposed on the back plate;

a diffusion plate disposed above the reflection sheet; and

an optical absorption layer disposed on the diffusion plate and/or the reflective sheet.

The utility model discloses a further setting, the optical absorption layer sets up on the play plain noodles of diffuser plate and/or the light facing side.

In a further aspect, the optical absorption layer is a coating or a film structure.

In a further arrangement of the utility model, the thickness of the coating is 0.05-0.15 mm.

The utility model discloses a further setting, the optical absorption layer in inlay in the diffuser plate.

In a further arrangement of the present invention, the optical absorption layer is disposed on the reflective surface of the reflective sheet; wherein, the optical absorption layer is a thin film structure.

In a further embodiment of the present invention, the thickness of the film structure is 0.05-1.00 mm.

The utility model discloses a further setting is still including setting up blue light source and superpose in proper order on the backplate are in the quantum dot film and the optics diaphragm of diffuser plate top.

The utility model discloses a further setting, the blue light source is blue light LED lamp, the blue light LED lamp shade is equipped with lens.

A display device comprises a liquid crystal panel and the backlight module.

The utility model provides a backlight module and display device, backlight module includes: a back plate; a reflective sheet disposed on the back plate; a diffusion plate disposed above the reflection sheet; and an optical absorption layer disposed on the diffusion plate and/or the reflection sheet. The optical absorption layer is designed on the diffusion plate or the reflector plate and absorbs red light and green light, so that the problem of color deviation caused by interference of the red light and the green light during local backlight modulation is solved, and the image quality display effect is improved.

Drawings

Fig. 1 is a schematic cross-sectional view 1 of a display device in one embodiment.

FIG. 2 is a schematic diagram of the light transmission of the display device in one embodiment.

Fig. 3 is a partially enlarged view of a portion a in fig. 2.

Fig. 4 is a schematic view of a partial structure of a display device in one embodiment 1.

Fig. 5 is a schematic view 2 of a partial structure of a display device in one embodiment.

Fig. 6 is a schematic view of a partial structure of a display device in one embodiment 3.

Fig. 7 is a schematic cross-sectional view 2 of a display device in one embodiment.

Fig. 8 is a partial structural view of a display device in one embodiment, fig. 4.

FIG. 9 is a spectrum of light absorbed by the red and green light absorbing materials for each wavelength band in one embodiment.

The various symbols in the drawings: 1. a back plate; 2. a reflective sheet; 3. a diffusion plate; 4. coating; 5. a thin film structure; 6. a blue LED lamp; 7. a lens; 8. a quantum dot film; 9. an optical film; 10. a liquid crystal panel.

Detailed Description

The utility model provides a backlight module and display device, the invention is mainly to direct type quantum dot is shaded from the sun + Local Dimming product, through carrying out the innovative design to optical component, is about to its optical component design has the optical component material that has strong absorption function to green glow and ruddiness, has solved the colour deviation problem that red light green glow interference leads to when Local backlight is adjusted, has improved the image quality display effect. In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the present invention will be described in further detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In the embodiments and claims, the terms "a" and "an" can mean "one or more" unless the article is specifically limited.

In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

Referring to fig. 1 to 9, the present invention provides a preferred embodiment of a display device.

As shown in fig. 1, 4, 5, 6 and 8, the display device includes a backlight module and a liquid crystal panel 10, wherein the backlight module includes a back plate 1, a reflector plate 2, a diffuser plate 3, a blue light source, a quantum dot film 8 and an optical film 9. Specifically, the reflective sheet 2 is disposed on the back plate 1, the diffusion plate 3 is disposed above the reflective sheet 2, the blue light source is a blue LED lamp 6 disposed on the back plate 1 and protruding above the reflective sheet 2, the blue LED lamp 6 is further covered with a lens 7, and the quantum dot film 8 and the optical film 9 are sequentially stacked on the diffusion plate 3. The diffusion plate 3 is provided with an optical absorption layer, the optical absorption layer is a coating 4 or a film structure 5, and the coating 4 or the film structure 5 comprises a red light absorption material and a green light absorption material.

Please refer to fig. 1 and combine fig. 2 and fig. 3, the utility model discloses a design coating 4 or film structure 5 on diffuser plate 3, after the blue light that blue light LED lamp 6 sent arouses Quantum Dot (QD) material on the Quantum Dot film 8, will produce the ruddiness and the green glow of upwards or downward transmission, the ruddiness of downward transmission, the ruddiness and the blue glow meet and have the absorption ruddiness, when the coating 4 or the film structure 5 of green glow material, the ruddiness and the green glow absorption that will produce, only keep the blue light to reflect and transmit and utilize again, the colour deviation problem that the red light interference leads to when having solved local backlight modulation, image quality display effect has been improved.

Further, the light absorption wavelength of the red light absorption material is 610-650 nm; the light absorption wavelength of the green light absorption material is 510-550 nm.

Specifically, the coating 4 or the film structure 5 is synthesized by a plurality of materials, the synthesized material can absorb red light and green light simultaneously, the synthesized material can be obtained by synthesizing a rhodamine derivative compound and a solvent blue anthraquinone compound product, or can be obtained by synthesizing a rhodamine derivative compound and a mixture of cobalt, alumina and phosphate, the rhodamine derivative compound can absorb red light with a wavelength range of 610-650nm, and the solvent blue anthraquinone compound product can absorb green light with a wavelength range of 510-550 nm.

Referring to fig. 4, in an embodiment of the present invention, an optical absorption layer is disposed on a light emitting surface of the diffusion plate 3, and the optical absorption layer is a coating 4, that is, the coating 4 is disposed on an upper surface of the diffusion plate 3; the coating 4 comprises the red light absorbing material and the green light absorbing material. When the blue light emitted by the blue light source LED excites the quantum dot material on the quantum dot film 8, red light and green light which are transmitted upwards or downwards are generated, and when the red light, the green light and the blue light which are transmitted downwards meet the red-green light absorption layer 4 with the material for absorbing the red light and the green light, the generated red light and the green light are absorbed, and only the blue light is reserved for reflection and transmission for reutilization. The thickness of the coating 4 is 0.05-0.15mm, and in this embodiment, the thickness is set to 0.10 mm. It can be understood that a thin film structure 5 can be further disposed on the light emitting surface, the thin film structure 5 includes the red light absorbing material and the green light absorbing material, the effect achieved by the thin film structure is consistent with the coating 4, the difference is that the thickness of the thin film structure 5 is 0.05-1.00mm, and the utility model discloses set up to 0.50 mm.

Referring to fig. 5, in an embodiment of the present invention, an optical absorption layer is disposed on a light-facing surface of the diffuser plate 3, and the optical absorption layer is a coating 4, that is, the coating 4 is disposed on a lower surface of the diffuser plate 3; the coating 4 comprises a red light absorbing material and a green light absorbing material. It will be appreciated that a thin-film structure 5 may also be provided on the light-facing side (lower surface), said thin-film structure 5 comprising said red-absorbing material and said green-absorbing material, to achieve an effect consistent with said coating 4. The effect of the coating 4 or the film structure 5 disposed on the upper surface or the lower surface of the diffuser plate 3 is the same, and the specific position thereof is determined according to the position of the quantum dot film 8, wherein the light absorption effect is better as the distance from the optical component (quantum dot film 8) containing the QD material is closer, and the specific design mode exists in relation to the structural design of the actual machine model, which is determined according to the severity of the crosstalk problem of the actual machine model.

Referring to fig. 6, in an embodiment of an embodiment, the diffusion plate 3 is embedded with a coating 4, that is, the coating 4 is disposed in the diffusion plate 3; the coating 4 comprises a red light absorbing material and a green light absorbing material. It is understood that the coating layers 4 are provided on the upper and lower surfaces of the diffusion plate 3 to function as those provided in the diffusion plate 3, and the position of the coating layer 4 is determined according to the position of the quantum dot thin film 8.

Referring to fig. 7 and 8, in an embodiment of the invention, a thin film structure 5 is disposed on a light reflecting surface of the reflector 2; the coating 4 comprises a red light absorbing material and a green light absorbing material. When the red light, the green light and the blue light transmitted downwards irradiate the reflecting surface of the reflector plate 2, the red light and the green light will be absorbed by the red light absorbing material and the green light absorbing material in the thin film structure 5, and only the blue light will be reflected and reused.

Referring to fig. 9, fig. 9 shows absorption spectra of red and green light absorbing materials for each wavelength band, wherein the horizontal axis is wavelength and the vertical axis is light reflection rate, curve a is a test absorption spectrum curve of a part without the red and green light absorbing materials, and curves B, C and D are test absorption spectrum curves of a part with the red and green light absorbing materials. In order to meet the requirement of light effect loss as little as possible, a design formula of a proportional formula is adopted for absorption and reflection of green light and red light by adjusting a plurality of pairs of absorption materials. That is, the absorption ratio of the absorption spectrum can be adjusted by adjusting the proportion of the raw materials of the absorption material (rhodamine derivative compound and solvent cyananthraquinone compound product or rhodamine derivative compound and cobalt and aluminum oxide and phosphate mixture), and if the special model has higher requirement on brightness, the absorption ratio of green light in the wavelength range of 550nm of green light can be specifically as low as possible, and the absorption ratios of other green lights having little influence on the brightness are as high as possible.

To sum up, the utility model provides a pair of backlight unit and display device, backlight unit includes: a back plate 1; a reflective sheet 2 disposed on the back plate 1; a diffusion plate 3 disposed above the reflection sheet 2; an optical absorption layer disposed on the diffusion plate 3 and/or the reflective sheet 2. By designing the coating 4 or the film structure 5 on the diffusion plate 3 or the reflection sheet 2, the red light absorbing material and the green light absorbing material which are provided in the coating 4 or the film structure 5 and have the absorbing function for red light and green light absorb the red light and the green light, the problem of color deviation caused by interference of the red light and the green light during local backlight modulation is solved, and the image quality display effect is improved.

It is to be understood that the invention is not limited to the above-described embodiments, and that modifications and variations may be made by those skilled in the art in light of the above teachings, and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.

Claims

1. A backlight module, comprising:

a back plate;

a reflective sheet disposed on the back plate;

a diffusion plate disposed above the reflection sheet; and

2. The backlight module according to claim 1, wherein the optical absorption layer is disposed on a light emitting surface and/or a light facing surface of the diffusion plate.

3. A backlight module according to claim 2, wherein the optical absorption layer is provided as a coating or a thin film structure.

4. A backlight module according to claim 3, wherein the coating has a thickness of 0.05-0.15 mm.

5. The backlight module as claimed in claim 1, wherein the optical absorption layer is embedded in the diffusion plate.

6. A backlight module according to claim 1, wherein the optical absorption layer is disposed on the light reflecting surface of the reflector plate; wherein, the optical absorption layer is a thin film structure.

7. A backlight module according to claim 3 or 6, wherein the film structure has a thickness of 0.05-1.00 mm.

8. The backlight module according to claim 1, further comprising a blue light source disposed on the back plate and a quantum dot film and an optical film stacked in this order above the diffusion plate.

9. The backlight module as claimed in claim 8, wherein the blue light source is a blue LED lamp, and the blue LED lamp is covered with a lens.

10. A display device comprising a liquid crystal panel and the backlight module according to any one of claims 1 to 9.