CN210465927U - Direct type backlight module and display device - Google Patents
Direct type backlight module and display device Download PDFInfo
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- CN210465927U CN210465927U CN201921595966.9U CN201921595966U CN210465927U CN 210465927 U CN210465927 U CN 210465927U CN 201921595966 U CN201921595966 U CN 201921595966U CN 210465927 U CN210465927 U CN 210465927U
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Abstract
The utility model discloses a straight following formula backlight unit, display device and electronic equipment. This straight following formula backlight unit includes: a circuit board; the light-emitting device comprises a circuit board, a plurality of light-emitting light sources, a plurality of light-emitting diodes and a plurality of light-emitting diodes, wherein the circuit board is provided with a plurality of light-emitting light sources which are arranged in an array structure; the quantum dot film is arranged on the light emitting side of the light emitting source and further comprises a penetrating and reflecting film; the penetrating and reflecting film is positioned between the light source and the quantum dot thin film, so that one part of light rays emitted by the light source and reaching the penetrating and reflecting film directly penetrate through the penetrating and reflecting film to be emitted, the other part of light rays is reflected by the penetrating and reflecting film to form reflected light, and the reflected light is reflected at one side of the light source, which is far away from the penetrating and reflecting film, and then is incident on the penetrating and reflecting film again, so that the purpose of further reducing the OD value of the backlight module on the premise of not influencing the optical performance of the backlight module is achieved.
Description
Technical Field
The utility model relates to a display technology especially relates to a straight following formula backlight unit and display device.
Background
With the development of science and technology, liquid crystal display devices enter thousands of households, and bring convenience to the lives of people. The liquid crystal display device comprises a display module and a backlight module. The display module does not emit light, and images are normally displayed by light provided by the backlight module.
At present, the thickness of the display device becomes an important index for evaluating the quality of the liquid crystal display device. One important way to reduce the thickness of the display device is to reduce the thickness of the backlight module. However, the OD (Optical Distance) value of the conventional backlight module, especially the direct-type backlight module, is generally larger. Here, the OD value is a distance between the light emitting surface of the light emitting source and the optical film closest thereto in the light transmission direction. This is because the conventional direct type backlight module includes a light source and a quantum dot film disposed on the light exit side of the light source. The light emitted by the light-emitting source propagates in the form of a light beam. The light beam is slightly divergent and irradiates the quantum dot film to form a light spot on the quantum dot film. Only when the OD value is large enough, light spots formed by light emitted by the light emitting sources on the light incident surface of the quantum dot film can be fused and cover the whole quantum dot film. If the OD value is too small, the light emitted from the light-emitting source forms independent light spots on the light-incident surface of the quantum dot film, which cannot be fused and even cover the whole quantum dot film. Obviously, this affects the optical performance of the backlight module. Therefore, how to reduce the OD value of the backlight module is an urgent problem to be solved.
SUMMERY OF THE UTILITY MODEL
The utility model provides a straight following formula backlight unit and display device to the realization further reduces backlight unit's OD value's purpose under the prerequisite that does not influence backlight unit optical property.
In a first aspect, the utility model provides a straight following formula backlight unit, include:
a circuit board;
the light-emitting device comprises a circuit board, a plurality of light-emitting light sources, a plurality of light-emitting diodes and a plurality of light-emitting diodes, wherein the circuit board is provided with a plurality of light-emitting light sources which are arranged in an array structure;
the quantum dot film is arranged on the light emitting side of the light emitting source;
it is characterized by also comprising a reverse penetrating film;
the penetrating and reflecting film is positioned between the light source and the quantum dot thin film, so that one part of light rays emitted by the light source and reaching the penetrating and reflecting film directly penetrate through the penetrating and reflecting film to be emitted, the other part of the light rays is reflected by the penetrating and reflecting film to form reflected light, and the reflected light is reflected at one side of the light source, which is far away from the penetrating and reflecting film, and then is incident on the penetrating and reflecting film again.
Further, the trans-membrane is a semi-trans and semi-permeable membrane.
Further, the semi-reflecting and semi-permeable film comprises a transparent substrate and a reflecting film which are arranged in a stacked mode;
the reflective film is positioned between the transparent substrate and the quantum dot thin film.
Further, the transflective film is a total reflection film.
Further, the total reflection film is of a double-layer film structure and comprises a first layer film and a second layer film; the first layer of film is positioned on one side of the second layer of film, which is far away from the circuit board;
the second layer of film has a refractive index greater than the refractive index of the first layer of film.
Further, the reflecting layer is arranged on the surface, close to the reflection penetrating film, of the circuit board;
the reflective layer is provided with a plurality of hollow areas, and the light-emitting light source is located in the hollow areas.
Further, the transflective film is a total reflection film;
the surface of one side of the reflecting layer close to the reflecting film is dispersed with a plurality of reflecting particles.
Further, the optical film also comprises a first optical film group;
the first optical film group is positioned between the quantum dot thin film and the transflective film.
In a second aspect, the present invention further provides a display device, including the present invention provides an arbitrary direct type backlight module.
The utility model discloses a set up wear the anti-membrane to be located luminescent light source with between the quantum dot film, so that some directly sees through in the light that the anti-membrane was worn in the arrival that luminescent light source sent wear anti-membrane outgoing, another part warp form the reverberation after wearing anti-membrane reflection, the reverberation is in luminescent light source deviates from incide once more after wearing anti-membrane one side reflection on wearing anti-membrane, solved current display device and further reduced the problem that OD value can influence backlight unit optical property, realize further reducing the purpose of backlight unit's OD value under the prerequisite that does not influence backlight unit optical property.
Drawings
Fig. 1 is a schematic structural diagram of a backlight module according to an embodiment of the present invention;
FIG. 2 is a light path diagram of light emitted by one of the light emitting sources of FIG. 1;
fig. 3 is a schematic structural diagram of another backlight module according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of another backlight module according to an embodiment of the present invention;
FIG. 5 is a light path diagram of light emitted by one of the light emitting sources of FIG. 4;
fig. 6 is a schematic structural diagram of another backlight module according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a display device according to an embodiment of the present invention.
Detailed Description
To further illustrate the technical means and effects of the present invention for achieving the intended purpose of the present invention, the following detailed description will be given with reference to the accompanying drawings and preferred embodiments of the present invention for the specific embodiments, structures, features and effects of the direct type backlight module, the display device and the electronic device according to the present invention.
Fig. 1 is a schematic structural diagram of a backlight module according to an embodiment of the present invention, and fig. 2 is a light path diagram of light emitted by a light source in fig. 1. Referring to fig. 1 and 2, the direct type backlight module includes: a circuit board 1; the light-emitting device comprises a circuit board 1, a plurality of light-emitting sources 2 arranged on the circuit board 1 in an array structure, and a plurality of light-emitting diodes (LEDs) 2, wherein each light-emitting source 2 is electrically connected with the circuit board 1; and the quantum dot film 3 is arranged on the light emitting side of the light emitting source 2. The direct type backlight module also comprises a penetrating reverse film 4; the penetrating and reflecting film 4 is positioned between the light source 2 and the quantum dot thin film 3, so that one part of light emitted by the light source 2 and reaching the penetrating and reflecting film 4 directly penetrates through the penetrating and reflecting film 4 to be emitted, the other part of light is reflected by the penetrating and reflecting film 4 to form reflected light, and the reflected light is reflected at one side of the light source 2, which is far away from the penetrating and reflecting film 4, and then enters the penetrating and reflecting film 4 again.
The technical scheme can solve the problem that the optical performance of the backlight module is influenced by further reducing the OD value of the conventional display device, and achieves the purpose of further reducing the OD value of the backlight module on the premise of not influencing the optical performance of the backlight module.
In the above technical solution, the choice of the transflective film 4 may be various, and the application does not limit this. Optionally, the transflective film 4 is a semi-reflective semi-permeable film or a total reflective film.
The following is a detailed description with reference to specific examples.
Illustratively, in fig. 1 and 2, the trans-membrane 4 is a semi-reflective and semi-permeable membrane. Fig. 3 is a schematic structural diagram of another backlight module according to an embodiment of the present invention. In contrast to fig. 1, only the transflector film 4 is absent from fig. 3. Referring to fig. 3, the light emitted from the light source 2 forms independent light spots a on the light incident surface of the quantum dot film 3. With continued reference to fig. 2, if the backlight module includes the transparent film 4, the light emitted from the light source 2 reaches the transparent film 4 and is divided into light rays I1And a light ray I2. Light ray I1Directly penetrates through the transflective film 4 to be incident on the quantum dot film 3, and forms a light spot A' on the incident surface of the quantum dot film 3. The area and position of the spot a' in fig. 1 and 2 are the same as those of the spot a in fig. 3. Light ray I2The light source 2 and the reflective film 4 are reflected by the reflective film 4 and the side of the light source 2 away from the reflective film 4 and then reach the reflective film 4 again. At the position of penetrating the reverse film 4, the light ray I2Is divided into light rays I21And a light ray I22. Light ray I21Directly penetrates through the reflection penetrating film 4 to be incident to the area between two adjacent light spots A' on the light incident surface of the quantum dot film 3. Light ray I22Sequentially pass through the reflective film 4 and the light-emitting source2, the light beam is reflected by the side departing from the reflective film 4 and then reaches the reflective film 4 again, and is divided into two beams of light again, and the steps are repeated. Thus light ray I21And a light ray I22After the light source reaches the reflection film 4 again, the part of the light source directly penetrating through the reflection film 4 and entering the light inlet surface of the quantum dot film 3 can form light spots on the light inlet surface of the quantum dot film 3, the light spots can be fused with the light spots A', the total area of the light spots formed on the light inlet surface of the quantum dot film 3 by the single light source 2 can be increased, and therefore the light emitted by the light source 2 finally covers the whole quantum dot film 3 under the condition of a small OD value, and the purpose of thinning the backlight module is achieved.
It should be noted that, in fig. 1 and 2, the light ray I emitted from the light emitting source 2 is exemplified2The light source 2 is reflected on the side of the reflective film 4 and the side of the light source 2 opposite to the reflective film 4, wherein the side of the light source 2 opposite to the reflective film 4 refers to the surface of the circuit board 1. This is only one specific example of the present application and is not limiting of the present application. In actual arrangement, a reflecting layer can be arranged between the circuit board 1 and the light-emitting source 2, and the reflecting layer is positioned on the surface of the circuit board close to the reflecting film; the reflecting layer is provided with a plurality of hollow areas, and the light-emitting light source is located in the hollow areas. At this time, "the side of the luminescent light source 2 facing away from the transflective film 4" means that the surface of the reflective layer near the transflective film. The light I can be improved by arranging the reflecting layer2The reflectivity on the reflective layer reduces light loss.
The transflective film has the characteristic of transmission of the partially reflective part of the light ray, and the transflective film 4 is arranged to be the transflective film, so that the transflective film has the advantages of simple structure, low cost and easy realization.
The specific structure of the semi-reflecting and semi-permeable membrane is various, and the application does not limit the structure. Optionally, the transflective film comprises a transparent substrate and a reflective film arranged in a stacked manner; the reflecting film is positioned between the transparent substrate and the quantum dot thin film. Illustratively, the material of the reflective film is silver. By adjusting the thickness of the reflective film, the ratio of the reflectivity and the transmissivity of the transflective film can be set to a proper value to meet the requirements of the application.
FIG. 4 is a view of the embodiment of the present inventionA structure diagram of a backlight module is also provided. Fig. 5 is a light path diagram of light emitted from one of the light emitting light sources of fig. 4. Alternatively, referring to fig. 4 and 5, the transflective film 4 is a total reflection film. Total reflection is the phenomenon that when light strikes the interface of two media, only reflection occurs and no refraction occurs. When the incident angle increases to a certain value (i.e. the critical angle of total reflection), the refraction angle will reach 90 °, at which time no refraction will occur in the optically thinner medium, and no refraction will occur as long as the incident angle is greater than or equal to the above value. Referring to FIG. 5, the light emitted by the light source 2 includes light I3And a light ray I4. Light ray I3The incident angle at the position of the total reflection film 4 is smaller than the critical angle of total reflection, and the incident light can directly penetrate through the reflective film 4 and enter the light incident surface of the quantum dot film 3. Light ray I4The incident angle at the total reflection film 4 is larger than the critical angle of total reflection, which will be reflected at the total reflection film 4 to form the first reflected light I41First reflected light I41To the side of the light-emitting source 2 facing away from the transflector 4. Since in practice the film layer on the side of the light source 2 facing away from the reflective film 4 is not ideally a very flat surface, it is usually rugged and has a microstructure. First reflected light I41A second reflected light I is formed after the reflection at the microstructure42The second reflected light I is caused to be reflected by the microstructure42The incident angle of partial light at the position of the total reflection film 4 is smaller than the total reflection critical angle, and the partial light can directly penetrate through the transflective film 4 to enter the light incident surface of the quantum dot film 3. The advantage of this arrangement is two, firstly, the light I with large angle can be processed4Reflecting to the lower reflecting layer for secondary utilization. Secondly, the light can be diffused to the dead zone directly irradiated by the light source 2 as much as possible.
The specific structure of the total reflection film 4 is various, and the present application does not limit this. Optionally, the total reflection film 4 is a double-layer film structure including a first layer film 41 and a second layer film 41; the first layer 41 is located on the side of the second layer 42 facing away from the circuit board 1; the refractive index of the second film 42 is greater than the refractive index of the first film 41.
In the above scheme "luminous lightThe side of the source 2 facing away from the counter film 4 "refers to the surface of the circuit board 1. This is only one specific example of the present application and is not limiting of the present application. In actual arrangement, a reflecting layer can be arranged between the circuit board 1 and the light-emitting source 2, and the reflecting layer is positioned on the surface of the circuit board close to the reflecting film; the reflecting layer is provided with a plurality of hollow areas, and the light-emitting light source is located in the hollow areas. At this time, "the side of the luminescent light source 2 facing away from the transflective film 4" means that the surface of the reflective layer near the transflective film. The light I can be improved by arranging the reflecting layer41The reflectivity on the reflective layer reduces light loss.
Optionally, the surface of the reflecting layer close to the side penetrating the reflecting film 4 can be dispersed with a plurality of reflecting particles, so that the surface of the reflecting layer is more uneven, and the utilization rate of light with large angles is further improved.
Optionally, the light emitting source 2 is a mini LED. The use of the mini LED is beneficial to further realizing the thinning of the backlight module.
After light emitted by the light source 2 is incident on the quantum dot film 3, the quantum dot is excited to convert the light into white light. Because the luminous visual angle of the quantum dots is larger than the luminous visual angle of the luminous light source 2, the display effect of the backlight module is favorably improved, and the OD value of the backlight module is further reduced.
Fig. 6 is a schematic structural diagram of another backlight module according to an embodiment of the present invention. Optionally, the backlight module further comprises a first optical film group 5; the first optical module group 5 is positioned between the quantum dot film 3 and the transflective film 4. The first optical film 5 can further adjust the light passing through the reflective film 5 to improve the uniformity and brightness of the light.
Optionally, first optical film set 5 comprises a diffuser film. This arrangement allows many refractions, reflections, and scatters of light incident thereon to maintain uniformity of in-plane brightness.
Alternatively, it may be also provided that the first optical film group 5 includes a prism sheet or the like.
With continued reference to fig. 6, optionally, the backlight module further includes a second optical film group 6; the second optical module group 6 is located on the side of the quantum dot film 3 away from the transparent film 4. The light emitted from the quantum dot film 3 can be further adjusted by the second optical film 6 to improve the uniformity and brightness of the light.
Optionally, the second optical film group 6 includes a prism sheet. The arrangement can lead the light emitted by the quantum dot film to be emitted in a concentrated way within a certain angle, thereby improving the brightness within the visual field range.
In view of this, the embodiment of the present invention further provides a display device. Fig. 7 is a schematic structural diagram of a display device according to an embodiment of the present invention. Referring to fig. 7, the display device includes any one of the direct type backlight module 10 and the display module 20 opposite to the direct type backlight module 10.
Because the embodiment of the utility model provides a display device includes the utility model provides an arbitrary straight following formula backlight unit, it has the same or corresponding beneficial effect of straight following formula backlight unit that it included, and it is no longer repeated here.
The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above embodiments, and although the present invention has been disclosed with the preferred embodiments, it is not limited to the present invention, and any skilled person in the art can make some modifications or equivalent changes without departing from the technical scope of the present invention.
Claims (10)
1. A direct type backlight module includes:
a circuit board;
the light-emitting device comprises a circuit board, a plurality of light-emitting light sources, a plurality of light-emitting diodes and a plurality of light-emitting diodes, wherein the circuit board is provided with a plurality of light-emitting light sources which are arranged in an array structure;
the quantum dot film is arranged on the light emitting side of the light emitting source;
it is characterized by also comprising a reverse penetrating film;
the penetrating and reflecting film is positioned between the light source and the quantum dot thin film, so that one part of light rays emitted by the light source and reaching the penetrating and reflecting film directly penetrate through the penetrating and reflecting film to be emitted, the other part of the light rays is reflected by the penetrating and reflecting film to form reflected light, and the reflected light is reflected on one side of the light source, which is far away from the penetrating and reflecting film, and then is incident on the penetrating and reflecting film again.
2. The direct type backlight module according to claim 1,
the trans-membrane is a semi-trans and semi-permeable membrane.
3. The direct type backlight module according to claim 2,
the semi-reflecting and semi-permeable film comprises a transparent substrate and a reflecting film which are arranged in a laminated mode;
the reflective film is positioned between the transparent substrate and the quantum dot thin film.
4. The direct type backlight module according to claim 1,
the penetrating and reflecting film is a total reflection film.
5. The direct type backlight module according to claim 4,
the total reflection film is of a double-layer film structure and comprises a first layer film and a second layer film; the first layer of film is positioned on one side of the second layer of film, which is far away from the circuit board;
the second layer of film has a refractive index greater than the refractive index of the first layer of film.
6. The direct type backlight module according to claim 1, further comprising a reflective layer on the surface of the circuit board adjacent to the reflective film;
the reflective layer is provided with a plurality of hollow areas, and the light-emitting light source is located in the hollow areas.
7. The direct type backlight module according to claim 6,
the penetrating and reflecting film is a total reflection film;
the surface of one side of the reflecting layer close to the reflecting film is dispersed with a plurality of reflecting particles.
8. The direct type backlight module according to claim 1, further comprising a first optical film group;
the first optical film group is located between the quantum dot thin film and the reflective film.
9. The direct type backlight module according to claim 1, further comprising a second optical film group;
the second optical film group is positioned on one side of the quantum dot film, which is far away from the reverse penetrating film.
10. A display device comprising the direct type backlight module according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921595966.9U CN210465927U (en) | 2019-09-24 | 2019-09-24 | Direct type backlight module and display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921595966.9U CN210465927U (en) | 2019-09-24 | 2019-09-24 | Direct type backlight module and display device |
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| Publication Number | Publication Date |
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| CN210465927U true CN210465927U (en) | 2020-05-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921595966.9U Active CN210465927U (en) | 2019-09-24 | 2019-09-24 | Direct type backlight module and display device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111929949A (en) * | 2020-08-18 | 2020-11-13 | 京东方科技集团股份有限公司 | LED backlight structure |
| CN113589588A (en) * | 2021-07-20 | 2021-11-02 | 武汉华星光电技术有限公司 | Backlight module and display module |
-
2019
- 2019-09-24 CN CN201921595966.9U patent/CN210465927U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111929949A (en) * | 2020-08-18 | 2020-11-13 | 京东方科技集团股份有限公司 | LED backlight structure |
| CN111929949B (en) * | 2020-08-18 | 2023-07-14 | 京东方科技集团股份有限公司 | LED backlight structure |
| CN113589588A (en) * | 2021-07-20 | 2021-11-02 | 武汉华星光电技术有限公司 | Backlight module and display module |
| CN113589588B (en) * | 2021-07-20 | 2023-12-01 | 武汉华星光电技术有限公司 | Backlight module and display module |
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