CN107329201A - Side entrance back module and display device - Google Patents

Abstract

The invention discloses a side-entry backlight module, wherein the side-entry backlight module includes a backplane, a light guide plate and a reflective film, the light guide plate and the reflective film are installed on the backplate, and the reflective The film has a first surface facing the light guide plate, the first surface of the reflective film is coated with a wavelength conversion layer, and the wavelength conversion layer is a mixture of quantum dot material and UV glue. The light efficiency of the quantum dot backlight module system can be improved, and the manufacturing cost when the quantum dot is applied to the display device can be reduced.

Description

Side-in backlight module and display device

technical field

The invention relates to the field of display technology, in particular to an edge-type backlight module and a display device.

Background technique

The side-type backlight module generally includes a backplane, a middle frame, a reflective film, a light guide plate and a light source. The light guide plate is fixed on the backplane through the middle frame, and the light-emitting surface of the light guide plate is set on the side facing away from the backplane. The light source is fixed on one side of the light guide plate for providing incident light. The reflective film is arranged on the side away from the light-emitting surface of the light guide plate, and the reflective film is provided with dots for uniform light.

Since the excited quantum dots can generate light with a narrow half-maximum width (FWHM) and high monochromatic purity, the application of quantum dots in a display device can obtain a backlight with a wider color gamut. However, because the water and oxygen tolerance of quantum dot materials is generally poor, so that the existing edge-lit backlight modules mostly use quantum tubes or quantum films to encapsulate quantum dots.

At present, when the quantum film method is adopted, since the outgoing light of the light guide plate needs to pass through the quantum film before exiting, the quantum film needs to use a large amount of quantum dot materials, resulting in an increase in cost. When the quantum tube method is adopted, the quantum tube needs to be fixed by an additional device, and the quantum tube is easily damaged by impact or vibration, resulting in increased cost. To sum up, the production cost of quantum dots applied to display devices is relatively high.

Contents of the invention

The main purpose of the present invention is to provide an edge-lit backlight module and a display device, aiming at reducing the manufacturing cost when quantum dots are used in the display device.

In order to achieve the above object, the side-entry backlight module proposed by the present invention includes a backplane, a light guide plate and a reflective film, the light guide plate and the reflective film are installed on the backplate, and the reflective film has a surface facing the light guide plate. The first surface is provided, the first surface of the reflective film is coated with a wavelength conversion layer, and the wavelength conversion layer is a mixture of quantum dot materials and UV glue.

Preferably, the backlight module further includes a light source disposed on the back plate and on one side of the light guide plate, and the density of the quantum dot material in the wavelength conversion layer is close to the light source along the light guide plate. One end increases toward the direction of the end away from the light source.

Preferably, the wavelength conversion layer is arranged in the shape of dots, and the density of dots in any area is proportional to the distance between the dots and the light source.

Preferably, on the reflective film, perpendicular to the increasing direction of the density of the quantum dot material, two adjacent dots are arranged at equal densities.

Preferably, the dots are formed by silk-screen printing on the first surface of the reflective film by quantum dot material and UV glue.

Preferably, the light source is a blue light source, and the quantum dot material is formed by mixing red quantum dot material and green quantum dot material.

Preferably, the mixing ratio of the green quantum dot material to the red quantum dot material is greater than or equal to 3.

Preferably, the wavelength conversion layer further includes a water-oxygen barrier, and the water-oxygen barrier is coated on the outer surface of the quantum dot material.

Preferably, the wavelength conversion layer further includes a water-oxygen barrier, the water-oxygen barrier is mixed with the quantum dot material, and is cured on the first surface of the reflective film by the UV glue.

The present invention also proposes a display device, the display device includes a side-type backlight module, the side-type backlight module includes a backplane, a light guide plate and a reflective film, and the light guide plate and reflective film are installed on the On the back plate, the reflective film has a first surface facing the light guide plate, the first surface of the reflective film is coated with a wavelength conversion layer, and the wavelength conversion layer is a mixture of quantum dot materials and UV glue. mixture.

The light source of the side-type backlight module of the present invention emits incident light, and the incident light is diffusely reflected in the light guide plate. The wavelength conversion layer on the surface, the wavelength conversion layer generates excited light, and the excited light reenters the light guide plate to form mixed light with the diffusely reflected light in the light guide plate. Wherein, the wavelength conversion layer coated on the first surface of the reflective film can continuously and stably generate stimulated light. The quantum dot material in the wavelength conversion layer is mixed with UV glue to form a mixture and solidified on the first surface of the reflective film to prevent the wavelength conversion layer from falling off, and after the quantum dot material receives the excitation light, the half maximum width (FWHM) is narrow, Stimulated light with high monochromatic purity increases the color gamut of mixed light, enabling quantum dot materials to be used in side-lit backlight modules. Compared with encapsulating quantum films or quantum tubes, the coated quantum dot material saves a large amount of quantum dot material, thus reducing the manufacturing cost when the quantum dot is applied to the display device.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained according to the structures shown in these drawings without creative effort.

1 is a schematic view of the internal structure of an embodiment of the side-entry backlight module of the present invention;

FIG. 2 is a schematic diagram of the internal structure of the wavelength conversion layer in FIG. 1;

Fig. 3 is the distribution curve diagram of network dot on reflective film among Fig. 1;

FIG. 4 is a front view of the reflective film in FIG. 1 .

Explanation of reference numbers:

label name label name 10 light guide plate 222 red quantum dot material 20 Reflective film 223 Green quantum dot material twenty one first surface 224 blocking agent twenty two wavelength conversion layer 30 light source 221 Outlets

The realization of the purpose of the present invention, functional characteristics and advantages will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

It should be noted that if there is a directional indication (such as up, down, left, right, front, back...) in the embodiment of the present invention, the directional indication is only used to explain the position in a certain posture (as shown in the accompanying drawing). If the specific posture changes, the directional indication will also change accordingly.

In addition, if there are descriptions involving "first", "second" and so on in the embodiments of the present invention, the descriptions of "first", "second" and so on are only for descriptive purposes, and should not be interpreted as indicating or implying Its relative importance or implicitly indicates the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In addition, the technical solutions of the various embodiments can be combined with each other, but it must be based on the realization of those skilled in the art. When the combination of technical solutions is contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist , nor within the scope of protection required by the present invention.

The present invention proposes a side-type backlight module and a display device including the backlight module. For example, the display device is a TV or a computer monitor. The TV is taken as an example for further description below.

In the first embodiment of the edge-type backlight module of the present invention, referring to FIG. 1 and FIG. 2 , the solid lines with arrows in the figures indicate planes or spaces such as surfaces, cavities, and holes. The side-entry backlight module includes a back plate (not shown in the figure), a light guide plate 10 and a reflective film 20, the conduit plate 10 and the reflective film 20 are installed on the back plate, and the reflective film 20 has a first set facing the light guide plate 10 The surface 21, the first surface 21 of the reflective film 20 is coated with a wavelength conversion layer 22, and the wavelength conversion layer 22 is a mixture of quantum dot material and UV glue.

Specifically, the light source 30 of the side-type backlight module emits incident light, and the incident light is diffusely reflected in the light guide plate 10. On the wavelength conversion layer 22 on the first surface 21 of the reflective film 20 , the wavelength conversion layer 22 generates excited light, and the excited light reenters the light guide plate 10 to form mixed light with the diffusely reflected light in the light guide plate 10 . Wherein, the wavelength conversion layer 22 coated on the first surface 21 of the reflective film 20 can continuously and stably generate stimulated light. The quantum dot material in the wavelength conversion layer 22 is mixed with UV glue to form a mixture that is cured on the first surface 21 of the reflective film 20 to prevent the wavelength conversion layer 22 from falling off, and after the quantum dot material receives the excitation light, it produces a half-width ( FWHM) is narrow, and the excited light with high monochromatic purity increases the color gamut of the mixed light, so that the quantum dot material can be used in the side-type backlight module. Compared with encapsulating quantum films or quantum tubes, the coated quantum dot material saves a large amount of quantum dot material, thus reducing the manufacturing cost when the quantum dot is applied to the display device.

It should be clarified here that the wavelength conversion layer 22 may include green light quantum dot material or red light quantum dot material, or may include green light quantum dot material and red light quantum dot material. Of course, phosphor materials may also be included to generate light in other color gamuts, which will not be detailed here.

Preferably, as shown in FIG. 1 , the edge-type backlight module further includes a light source 30 disposed on the back plate and on one side of the light guide plate 10 , and the quantum dot material in the wavelength conversion layer 22 is close to the light source 30 along the light guide plate 10 One end increases toward the end away from the light source 30 . Considering that the position of the wavelength conversion layer 22 close to the light source 30 has stronger light energy, and the position farther away from the light source 30 has weaker light energy, by designing the density of the wavelength conversion layer 22 from sparse to dense along the light incident direction V, the received light can be made The light energy of the excitation light is uniformly distributed. In addition, the reflective film 20 set in this way can indirectly make the light guide plate 10 not need to be designed for uniform distribution of light energy. On the premise of uniform light energy, the manufacturing cost of quantum dots used in the display device is further saved.

Preferably, referring to FIG. 1 and FIG. 3 , the wavelength conversion layer 22 is arranged in the form of dots, and the density of dots 221 in any area is proportional to the distance between the dots 221 and the light source 30 . The purpose of this arrangement is to further save quantum dot materials, simplify production, and further enable the wavelength conversion layer 22 to easily generate stimulated light as the distance increases along the light incident direction V, so that the light of the stimulated light The energy distribution is more even.

Preferably, as shown in FIG. 1 and FIG. 4 , on the reflective film 20 perpendicular to the increasing direction of the density of the quantum dot material, two adjacent dots 221 are arranged at equal densities. The advantage of such arrangement is that the light energy distribution of the excited light along the direction perpendicular to the light incident direction V of the light guide plate 10 can be made more uniform. Preferably, the grid dots 221 are formed by silk-screen printing on the first surface 21 of the reflective film 20 by quantum dot material and UV glue, so as to improve production efficiency and make the position of the grid dots 221 more accurate.

Alternatively, referring to FIG. 1 and FIG. 2 , the light source 30 is a blue light source, and the quantum dot material is formed by mixing red quantum dot material 222 and green quantum dot material 223 . The use of the blue light source can further reduce the production cost, and the use of the blue light source is monochromatic incident light, which excites the red quantum dot material 222 in the wavelength conversion layer 22 to generate red excited light. At the same time, the incident light excites the green quantum dot material 223 in the wavelength conversion layer 22 to generate green excited light. The stimulated light is mixed with the blue monochromatic incident light to give mixed white light. After the green quantum dot material 223 and the red quantum dot material 222 are excited, green light and red light with a narrow half-maximum width (FWHM) and high monochromatic purity can be obtained, so the color gamut of the mixed light is expanded.

Preferably, the mixing ratio of the green quantum dot material 223 and the red quantum dot material 222 is greater than or equal to 3 times. Preferably, the mixing ratio of the green quantum dot material 223 and the red quantum dot material 222 is between 3 and 20. This setting can make the mixed white light more uniform. The quantum dot materials in the present invention include but not limited to cadmium selenide (CdSe), perovskite (CaTiO3), indium phosphide (InP), etc., in order to obtain relatively stable received light.

Preferably, the wavelength conversion layer 22 further includes a water-oxygen barrier 224, and the water-oxygen barrier 224 is coated on the outer surface of the quantum dot material. Alternatively, the water and oxygen blocking agent 224 is mixed with the quantum dot material and cured by UV glue to synthesize the wavelength conversion layer 22 . Since the high temperature performance of the quantum dot material is weak, and the tolerance of water and oxygen is not good, therefore, the quantum dot material can be made more stable by isolating water, oxygen and high temperature through the barrier agent 224 . The barrier agent 224 material can be: SiO ₂ , TiO ₂ , Al ₂ O ₃ , CaCO ₃ , BaSO ₄ , polymethyl methacrylate PMMA, polystyrene PS, acrylonitrile-butadiene-styrene copolymer ABS, One or more of polyurethane PU and silicone polymer to effectively block water and oxygen under relatively high temperature conditions.

The above is only a preferred embodiment of the present invention, and does not therefore limit the patent scope of the present invention. Under the inventive concept of the present invention, the equivalent structural transformation made by using the description of the present invention and the contents of the accompanying drawings, or direct/indirect use All other relevant technical fields are included in the patent protection scope of the present invention.

Claims (10)

1. a kind of side entrance back module, including backboard, light guide plate and reflectance coating, the light guide plate and reflectance coating are installed on described On backboard, the reflectance coating has the first surface set towards the light guide plate, it is characterised in that the first of the reflectance coating Surface is coated with wavelength conversion layer, and the wavelength conversion layer is quanta point material and the mixed mixture of UV glue.

2. side entrance back module as claimed in claim 1, it is characterised in that the backlight module is also described including being arranged on On backboard and the light source in the light guide plate side, the density of the quanta point material in the wavelength conversion layer is along the leaded light Plate is incremented by close to one end of the light source towards the extreme direction away from the light source.

3. side entrance back module as claimed in claim 2, it is characterised in that the wavelength conversion layer is set in net-point shape, The density of the site of any region and the site to the distance between light source direct proportionality.

4. side entrance back module as claimed in claim 3, it is characterised in that the vertical quantum dot on the reflectance coating The density of material is incremented by direction, and site isodensity described in adjacent two is set.

5. the side entrance back module as described in claim 3 or 4, it is characterised in that the site is by quanta point material and UV First surface of the glue by silk-screen in the reflectance coating is formed.

6. side entrance back module as claimed in claim 2, it is characterised in that the light source is blue light source, the quantum Point material is mixed to form by red quantum dot material and green quanta point material.

7. side entrance back module as claimed in claim 6, it is characterised in that the green quanta point material and the red The mixed proportion of quanta point material is more than or equal to 3.

8. side entrance back module as claimed in claim 1, it is characterised in that the wavelength conversion layer also includes water oxygen and obstructed Agent, the water oxygen barrier is coated on the outer surface of the quanta point material.

9. side entrance back module as claimed in claim 1, it is characterised in that the wavelength conversion layer also includes water oxygen and obstructed Agent, the water oxygen barrier is mixed with the quanta point material, and by the UV glue curings in the first of the reflectance coating On surface.

10. a kind of display device, it is characterised in that including side entrance back mould as in one of claimed in any of claims 1 to 9 Group.