CN109782489B - Backlight module and display device - Google Patents
Backlight module and display device Download PDFInfo
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- CN109782489B CN109782489B CN201910245742.3A CN201910245742A CN109782489B CN 109782489 B CN109782489 B CN 109782489B CN 201910245742 A CN201910245742 A CN 201910245742A CN 109782489 B CN109782489 B CN 109782489B
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Abstract
The application provides a backlight unit and display device, backlight unit includes: the LED module comprises a printed circuit board, a plurality of light sources, an optical film layer and a blue light eliminating layer which are arranged in a stacked mode; the plurality of light sources are mounted on a first surface of the printed circuit board; the first surface of the printed circuit board includes a central area parallel to the optical film layer and an edge area peripheral to the central area, the edge area being inclined toward the optical film layer. Adopt marginal area towards the printed circuit board of optics diaphragm layer slope, can be so that the light source of installing at printed circuit board first surface marginal area sent is towards display panel's display area deflection to can reduce the side light leak, reduce the blue light of short wave band and jet out, avoid the blue light to cause the injury to the people's eye, can strengthen the luminance in display area simultaneously, improve light utilization.
Description
Technical Field
The invention relates to the technical field of display, in particular to a backlight module and a display device.
Background
Currently, more and more electronic devices are beginning to add blue light prevention functions. The harmful blue light with the wave band of 400-450 nm is removed in the blue light prevention process, because the yellow spot toxin amount of human eyes is increased due to the blue light wave band, and the human eyes are damaged. To achieve the blue light prevention function, existing designs are mostly made by adding a blue light prevention film.
The mode of increasing anti-blue light membrane is the anti-blue light membrane of one deck increase between backlight unit and display panel usually, perhaps uses between display panel and touch cover plate glass to prevent blue light optical cement and laminates, realizes preventing the blue light function. However, the conventional backlight module still has light leakage at the side edge position, and the side edge leakage light includes blue light of a short wavelength band, as shown in fig. 1, and this part of light is directly emitted without passing through the blue light prevention film, which may still cause damage to human eyes and reduce the light utilization rate.
Disclosure of Invention
The invention provides a backlight module and a display device, which are used for reducing side light leakage.
In order to solve the above problems, the present invention discloses a backlight module, which includes: the LED module comprises a printed circuit board, a plurality of light sources, an optical film layer and a blue light eliminating layer which are arranged in a stacked mode;
the plurality of light sources are mounted on a first surface of the printed circuit board;
the first surface of the printed circuit board includes a central area parallel to the optical film layer and an edge area peripheral to the central area, the edge area being inclined toward the optical film layer.
Optionally, the light source has a divergence angle, the surface of the edge region facing the optical film layer is a plane, and the slope angle of the plane is half of the divergence angle.
Optionally, the light source has a divergence angle, the surface of the edge region facing the optical film layer is a curved surface, and a slope angle of a tangent plane of the curved surface at the first edge is half of the divergence angle.
Optionally, the edge region is centrosymmetric with respect to a center point of the central region.
Optionally, the printed circuit board includes a copper layer and a composite layer, which are stacked, and the copper layer is disposed adjacent to the light source.
Optionally, the copper layer is of uniform thickness.
Optionally, the distance between the second edge of the first surface and the optical film layer is less than or equal to a preset threshold, the preset threshold being proportional to the width of the optical film layer and inversely proportional to the divergence angle of the light source.
Optionally, the anti-blue layer is a quantum dot film layer.
In order to solve the above problem, the present invention further discloses a display device, which includes a display panel and the optical module according to any embodiment, wherein the display panel is located on a side of the blue light eliminating layer departing from the optical film layer.
Optionally, the display panel includes a display area and a non-display area, and an orthographic projection of the printed circuit board on the display panel covers the display area.
Compared with the prior art, the invention has the following advantages:
the application provides a backlight unit and display device adopts the marginal zone towards the printed circuit board of optics diaphragm layer slope, can so that the light source of installing at printed circuit board first surface marginal zone sent is towards the display area deflection of display panel to can reduce the side light leak, reduce the blue light of short wave band and jet out, avoid the blue light to cause the injury to the people's eye, can strengthen the luminance in display area simultaneously, improve light utilization ratio.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor.
FIG. 1 is a schematic cross-sectional view illustrating a backlight module according to the related art;
fig. 2 is a schematic cross-sectional view illustrating a backlight module according to an embodiment of the present disclosure;
fig. 3 is a schematic cross-sectional view illustrating a printed circuit board according to an embodiment of the present disclosure;
FIG. 4 is a schematic cross-sectional view of another printed circuit board provided in the embodiments of the present application;
fig. 5 is a schematic diagram illustrating a top view structure of a printed circuit board according to an embodiment of the present application;
FIG. 6 is a schematic diagram illustrating a layer structure of a printed circuit board according to an embodiment of the present disclosure;
FIG. 7 is a graph showing the geometrical relationship between the divergence angle of the light source, the OD value and the width of the optical film layer provided by the embodiments of the present application;
fig. 8 is a schematic cross-sectional view illustrating a display device according to an embodiment of the present disclosure.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
The inventor finds that because the PCB board for placing the light source in the existing backlight module is designed to be a cuboid, light rays emitted by the light sources on four sides of the PCB board can leak out from the side of the module, wherein the blue light of a short wave band can increase the toxin amount in a yellow spot area of human eyes, and the human eyes are damaged.
In order to solve the above problem, an embodiment of the present application provides a backlight module, and referring to fig. 2, the backlight module may include: a Printed Circuit Board (PCB) 20, a plurality of light sources 21, an optical film layer 22, and a blue-light-eliminating layer 23, which are stacked.
Wherein a plurality of light sources 21 are mounted on a first surface of the printed circuit board 20.
The first surface of the printed circuit board 20 comprises a central area AA parallel to the optical film layer 22 and an edge area BB peripheral to the central area AA, inclined towards the optical film layer 22.
The light source 21 may be, for example, a Mini LED, and is distributed and mounted on the central area AA and the edge area BB of the first surface of the printed circuit board 20. Wherein the light source 21 has a divergence angle α, and the light-emitting optical axis of the light source 21 may be along the normal direction of the first surface.
The optical film layer 22 may include, for example, a diffuser and a prism sheet in a stacked arrangement, wherein the diffuser is disposed adjacent to the light source.
The anti-blue layer 23 may be a quantum dot film layer. When the blue light emitted by the light source 21 passes through the optical film layer 22, the blue light hits the quantum dot film, and the blue light excites the quantum dots of green light and red light wave bands on the quantum dot film, so that the red, green and blue primary colors are mixed to excite white light, and the effect of eliminating the blue light is realized.
It should be noted that the blue light eliminating layer may also be a blue light preventing filter membrane, and the like, as long as the membrane layer capable of filtering blue light is within the protection range of the embodiment.
In one implementation, referring to fig. 3, the surface of the edge area BB facing the optical film layer 22 is a plane with a slope angle β that is half the divergence angle α.
Specifically, the four side edges of the printed circuit board 20(PCB board) may be wedge-shaped.
In another implementation, referring to fig. 4, the surface of the edge area BB facing the optical film layer 22 is a curved surface, and the slope angle β of the tangent plane of the curved surface at the first edge C is half of the divergence angle α.
Specifically, the four side edges of the printed circuit board 20(PCB board) may be arc-shaped. The first edge C may be, for example, the position of the outermost light source on the edge area BB.
In the practical application process, when the PCB (printed circuit board 20) is powered on and the Mini LED (light source 21) is turned on, the Mini LED in the central area AA of the PCB emits light according to the inherent emission angle (divergence angle α). The Mini LED located in the edge area BB of the PCB emits light at a specific emission angle (divergence angle α), but the light emitting direction of the Mini LED disposed on the edge area BB of the PCB is deflected toward the central area AA because the edge area BB of the PCB is a plane or a curved surface inclined toward the optical film layer 22. As long as the Mini LED light is deflected toward the central area AA, the blue light running out from the side edge is reduced, and further, when the planar gradient angle β or the gradient angle β of the tangent plane of the curved surface at the first edge C is half of the divergence angle α, the emergent light of the Mini LED can be all emitted to the optical film layer 22. When the blue light deflected to the central area AA is irradiated onto the quantum dot film through the optical film layer 22, the blue light excites the quantum dot to generate white light, and the white light is emitted from the quantum dot film and is transmitted out of the liquid crystal panel to reach human eyes.
Referring to fig. 5, the edge area BB is centrosymmetric with respect to the center point of the central area AA. I.e. the opposite edge areas on the first surface of the printed circuit board 20.
Referring to fig. 6, the printed circuit board 20 may include a copper layer 61 and a composite layer 62 that are disposed in a stack, the copper layer 61 being disposed adjacent to the light source 21. Wherein the copper layer 61 has a uniform thickness.
Specifically, the PCB (printed circuit board 20) is formed by stacking the copper layer 61 and the composite material layer 62 (e.g. FR4), and in order to ensure the uniformity of the current in the circuit, i.e. the current is uniform everywhere, the thickness of the copper layer 61 should be uniform everywhere, at the interface between the central area AA and the edge area BB of the PCB, the composite material layer 62 (e.g. FR4) may be pre-heated and deformed into a plane or a curved surface.
In order to avoid that light emitted by the light source on the edge area BB does not exit from the opposite side, with reference to fig. 7, the distance H between the second edge D of the first surface and the optical film layer 22 is less than or equal to a preset threshold value, which is proportional to the width L of the optical film layer 22 and inversely proportional to the divergence angle α of the light source 21.
In particular, the second edge D may be, for example, the location of the outermost light source on the first surface.
Referring to fig. 7, taking the light emitted from the left Mini LED as an example, assuming that the emitting angle (divergence angle) of the Mini LED is α, the distance (OD value) between the second edge D of the first surface and the optical film layer 22 is H, and the width of the optical film layer 22 is L, the following mathematical relationship approximately exists:
Therefore, in order to prevent the light emitted from the Mini LED in the edge area BB from being emitted from the opposite side, the OD value is required when the Mini LED emission angle value α is constant:
the backlight module provided by the embodiment can deflect the Mini LED light at the side of the PCB to the display area, and can reduce the problem that blue light leaks from the side of the Mini LED at the side of the PCB, thereby reducing the generation of toxins in the yellow spot area of human eyes and protecting the human eyes; the edge area of the PCB inclined towards the optical film layer is beneficial to deflecting light of the Mini LED to the display area, so that the quantity of the light entering the display area can be increased, and the light utilization rate is improved.
Another embodiment of the present application provides a display device, referring to fig. 8, including a display panel 81 and the optical module 82 according to any embodiment, wherein the display panel 81 is located on a side of the blue light eliminating layer 23 away from the optical film layer 22.
In practical applications, the display device may further include a rubber frame 83 and a back plate 84.
The display device in this embodiment may be: any product or component with a display function, such as electronic paper, a mobile phone, a tablet computer, a television, a notebook computer, a digital photo frame, a navigator and the like.
The display panel comprises a display area and a non-display area, and the orthographic projection of the printed circuit board on the display panel covers the display area. Thus, the problem of dark periphery of the display panel can be avoided, and the brightness uniformity of the display area is ensured.
In the display device provided by the embodiment, the edge area of the PCB inclined towards the optical film layer in the direct type Mini LED backlight module enables the Mini LED light rays placed in a matched mode to deflect towards the display area, the problem of side light leakage is avoided, and the brightness of the module can be improved.
The embodiment of the application provides a backlight unit and display device adopts the marginal area towards the printed circuit board of optics diaphragm layer slope, can so that the light source of installing at printed circuit board first surface marginal area sent is towards the display area deflection of display panel to can improve the side light leak harmfully effectively, reduce the blue light of short wave band and jet out, avoid causing the injury to people's eye, strengthen the luminance in display area simultaneously, improve light utilization.
The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The backlight module and the display device provided by the invention are described in detail, and the principle and the implementation mode of the invention are explained by applying specific examples, and the description of the examples is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (8)
1. A backlight module is characterized in that the backlight module comprises: the LED module comprises a printed circuit board, a plurality of light sources, an optical film layer and a blue light eliminating layer which are arranged in a stacked mode;
the plurality of light sources are mounted on a first surface of the printed circuit board;
the first surface of the printed circuit board comprises a central area and an edge area at the periphery of the central area, the central area is parallel to the optical film layer, and the edge area is inclined towards the optical film layer;
the light source has a divergence angle;
the surface of the edge area facing the optical film layer is a plane, and the gradient angle of the plane is half of the divergence angle; or the surface of the edge area facing the optical film layer is a curved surface, and the slope angle of a tangent plane of the curved surface at the first edge is half of the divergence angle.
2. A backlight module according to claim 1, wherein the edge regions are centrosymmetric with respect to a center point of the central region.
3. The backlight module according to claim 1, wherein the printed circuit board comprises a copper layer and a composite layer disposed in a stacked manner, the copper layer being disposed adjacent to the light source.
4. A backlight module according to claim 3, wherein the copper layer is of uniform thickness.
5. The backlight module according to claim 1, wherein a distance between the second edge of the first surface and the optical film layer is less than or equal to a preset threshold, and the preset threshold is proportional to a width of the optical film layer and inversely proportional to a divergence angle of the light source.
6. The backlight module according to any of claims 1 to 5, wherein the anti-blue layer is a quantum dot film layer.
7. A display device, comprising a display panel and the backlight module set forth in any one of claims 1 to 6, wherein the display panel is located on a side of the blue light eliminating layer facing away from the optical film layer.
8. The display device according to claim 7, wherein the display panel includes a display area and a non-display area, and wherein an orthographic projection of the printed circuit board on the display panel covers the display area.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910245742.3A CN109782489B (en) | 2019-03-28 | 2019-03-28 | Backlight module and display device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910245742.3A CN109782489B (en) | 2019-03-28 | 2019-03-28 | Backlight module and display device |
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| CN109782489A CN109782489A (en) | 2019-05-21 |
| CN109782489B true CN109782489B (en) | 2021-10-22 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110690241B (en) * | 2019-09-20 | 2021-12-28 | 深圳市华星光电半导体显示技术有限公司 | Display device manufacturing method and display device |
| TWI702427B (en) * | 2019-12-12 | 2020-08-21 | 台灣愛司帝科技股份有限公司 | Image display and backlight module thereof |
| CN111679498A (en) * | 2020-06-22 | 2020-09-18 | 武汉华星光电技术有限公司 | Backlight module and display device |
| CN115280230A (en) * | 2021-03-01 | 2022-11-01 | 京东方科技集团股份有限公司 | Light-emitting module and display module |
| CN115542611B (en) * | 2022-11-25 | 2023-03-17 | 惠科股份有限公司 | Backlight module and display device |
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