CN108227071B - Backlight module and electronic device - Google Patents
Backlight module and electronic device Download PDFInfo
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- CN108227071B CN108227071B CN201810105870.3A CN201810105870A CN108227071B CN 108227071 B CN108227071 B CN 108227071B CN 201810105870 A CN201810105870 A CN 201810105870A CN 108227071 B CN108227071 B CN 108227071B
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- 238000007650 screen-printing Methods 0.000 claims description 2
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
- G02B6/0051—Diffusing sheet or layer
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
- G02B6/0053—Prismatic sheet or layer; Brightness enhancement element, sheet or layer
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Planar Illumination Modules (AREA)
- Liquid Crystal (AREA)
Abstract
The application discloses backlight module and electronic device. The backlight module includes: the light guide plate comprises a light incident surface and a light emergent surface; the light source is arranged at intervals with the light incident surface; the light homogenizing element is arranged on the light emitting surface of the light guide plate, and one end, close to the light incident surface, of the light homogenizing element is positioned in the non-display area; and the shading fixed layer is arranged in the non-display area, arranged on the side surface of the light uniformizing element close to the light incident surface and the side surface far away from the light emergent surface, and used for fixing the light uniformizing element and preventing the light leakage of the non-display area. Therefore, the fixing element for fixing the light homogenizing element can be saved, the width of the non-display area occupied by the backlight module can be reduced, and the phenomenon of light leakage of the backlight module can be avoided.
Description
Technical Field
The present disclosure relates to backlight devices, and particularly to a backlight module and an electronic device.
Background
At present, with the development of science and technology, electronic devices such as smart phones and the like are gradually becoming necessities of life of people.
Backlight unit is the important part of electron device, the backlight unit of portable electron device such as smart mobile phone at present adopts the formula backlight unit of side income usually, the light that the light source sent jets into the light guide plate from the light guide plate side promptly, provide back light for electron device's display panel after the light guide plate leaded light, however because this kind of formula backlight unit's of side income light source and some relevant structures need set up the side at the light guide plate, consequently, occupy great non-display area, be unfavorable for the realization of narrow frame and comprehensive screen, how to shorten backlight unit in the width of non-display area and do not influence the normal demonstration of backlight unit and display panel, become the focus problem that people paid attention to.
Disclosure of Invention
In one aspect, an embodiment of the present application provides a backlight module, which includes: the light guide plate comprises a light incident surface and a light emergent surface; the light source is arranged at intervals with the light incident surface; the light homogenizing element is arranged on the light emitting surface of the light guide plate, and one end, close to the light incident surface, of the light homogenizing element is positioned in the non-display area; and the shading fixed layer is arranged in the non-display area, arranged on the side surface of the light uniformizing element close to the light incident surface and the side surface far away from the light emergent surface, and used for fixing the light uniformizing element and preventing the light leakage of the non-display area.
On the other hand, an embodiment of the present application further provides an electronic device, which includes the backlight module described above.
The embodiment of the application can block light from leaking to the outside from the non-display area by arranging the shading fixed layer on the side surface, close to the light inlet surface, of the dodging element and the side surface, far away from the light outlet surface, of the dodging element in the non-display area, and can fix the dodging element, so that the fixed element for fixing the dodging element can be saved, the width of a non-display area occupied by the backlight module can be reduced, and the phenomenon of light leakage of the backlight module can be avoided.
Drawings
Fig. 1 is a schematic structural diagram of a backlight module according to a first embodiment of the present application;
FIG. 2 is a schematic structural diagram of a light uniformizing element of the backlight module shown in FIG. 1;
fig. 3 is a schematic view illustrating a light-shielding principle of a light-shielding fixing layer of a backlight module according to a first embodiment of the present application;
FIG. 4 is a schematic cross-sectional view of a backlight module of a second embodiment of the present application, taken along the direction C-C of the diffuser film and the second brightness enhancement film shown in FIG. 6;
FIG. 5 is a schematic cross-sectional view of a backlight module of a second embodiment of the present application, taken along the direction B-B of the diffuser film and the second brightness enhancement film shown in FIG. 6;
FIG. 6 is a schematic view of the diffusion film and second brightness enhancement film of a second embodiment of the present application;
FIG. 7 is a schematic cross-sectional view of a backlight module according to a third embodiment of the present application, taken along the direction D-D of the first brightness enhancement film shown in FIG. 8;
fig. 8 is a schematic structural view of a first brightness enhancement film according to a third embodiment of the present application;
fig. 9 is an exploded schematic view of an electronic device according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the specific embodiments described herein are merely illustrative of the application and are not limiting of the application. It should be further noted that, for the convenience of description, only some of the structures related to the present application are shown in the drawings, not all of the structures. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terms "first", "second", etc. in this application are used to distinguish between different objects and not to describe a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
It should be noted that when a portable electronic device such as a smart phone pursues a narrow bezel or a full-face screen, it is usually endeavored to omit some non-optical elements, i.e. elements that do not substantially participate in light emission and light transmission, for example, elements that only serve as a separate light shielding function are removed, so that the space of the elements can be saved, and the design of the narrow bezel or the full-face screen is further proceeded. For example, in a backlight module of a portable electronic device such as a smartphone, a light shielding member provided on a light guide plate and located on a side surface of a light uniformizing member may be removed. However, the element without the light shielding function will cause a problem of light leakage, which ultimately affects the user experience. Embodiments of the present application provide a backlight module and an electronic device to solve the above problems, and refer to the following embodiments provided in the present application:
referring to fig. 1, fig. 1 is a schematic structural diagram of a backlight module according to a first embodiment of the present application. In the present embodiment, the backlight module includes a back frame 11, a reflective sheet 12, a light guide plate 13, a light uniformizing element 14, a light source 15 and a light blocking fixing layer 16.
The back frame 11 is a box-shaped structure with an opening on one side, the back frame 11 includes a bottom wall 111 and a side wall 112, the bottom wall 111 is connected with the side wall 112 in a bending manner, and the bottom wall 111 and the side wall 112 enclose an accommodating cavity. The back frame 11 may be made of metal, such as iron or aluminum, or plastic.
The reflective sheet 12 is disposed on the bottom wall 111 of the back frame 11 and located inside the accommodating cavity. The reflective sheet 12 may reflect incident light.
The light guide plate 13 is disposed on the reflective sheet 12 and located inside the accommodating cavity. The light guide plate 13 includes a light incident end 131 and a light guide plate main body 132, the light incident end 131 is provided with a light incident surface 133, and the light guide plate main body 132 is provided with a light emitting surface 134. The thickness of the light incident end 131 is greater than that of the light guide plate main body 132, and the thickness of the light incident end 131 gradually decreases from the light incident surface 133 to the direction away from the light incident surface 133, so that the thickness of the light guide plate main body 132 is uniform, that is, equal everywhere.
The light source 15 is disposed on the light incident surface 131 side and on a region of the reflection sheet 12 not covered by the light guide plate 13. The light source 15 may be an LED lamp.
The light uniformizing element 14 is disposed on the light emitting surface 134 of the light guide plate 13, and one end of the light uniformizing element 14 close to the light incident surface 132 is located in the non-display region 140.
The light emitted from the light source 15 enters the light entrance end 131 of the light guide plate 13 through the light entrance surface 132 of the light guide plate 13, the light entrance end 131 guides the light into the light guide plate main body 132 by using the wedge structure, the light guide plate main body 132 guides the light to spread over the whole light guide plate main body 132 and then transmits the light to the light uniformizing element 14, and the incident light is diffused, condensed, brightened and the like by the light uniformizing element 14 and then output as the backlight module. Part of the light leaking from the side of the light guide plate 132 away from the light exit surface 134 is reflected back into the light guide plate 13 by the reflective sheet 12.
It will be appreciated that the light output from the backlight will be displayed in the display area to form the desired image. In order to seek a high screen ratio, i.e. a wide screen or even a full screen, it will put a very demanding restriction on the design width of the non-display area, and the design of the narrow bezel usually removes some elements that are not essential for the emission and transmission of light, for example, some elements that only block light. This easily causes a light leakage phenomenon in the non-display region. In contrast, in the present embodiment, the light-shielding fixing layer is disposed in the non-display region to avoid the problem of light leakage.
Specifically, the light-shielding fixing layer 16 is disposed in the non-display region 140, and disposed on the side of the light uniformizing element 14 close to the light incident surface 133 and the side far from the light emitting surface 134. For blocking light emitted from the light source 15 from leaking to the outside in the non-display region 140, and for fixing the light unifying element 14. Therefore, only one film layer is needed to avoid light leakage of the backlight module, and the width of a non-display area occupied by the backlight module is reduced. In addition, the light-shielding fixing element 16 has the function of fixing the light uniformizing element 14, so that the fixing element for fixing the light uniformizing element 14 can be further saved, that is, the width of the backlight module occupying the non-display area can be further reduced.
The light-shielding fixing layer 16 is a black ink layer with an adhesive on the surface. Wherein, the black ink layer can be formed by a screen printing process. The light shielding fixing layer 16 may be formed by spraying on the side of the light homogenizing element 14 close to the light incident surface 133 and the side far from the light emitting surface 134. It should be understood that the light-shielding fixing layer 16 may also be formed by other processes, which are not limited in the embodiments of the present application.
Referring to fig. 1, the light uniformizing element 14 includes a diffusion film 141, a first light enhancement film 142 and a second light enhancement film 143 sequentially disposed on the light emergent surface 134. The diffusion film 141, the first brightness enhancement film 142, and the second brightness enhancement film 143 are independent films. That is, the diffusion film 141, the first brightness enhancement film 142, and the second brightness enhancement film 143 are separately manufactured and then attached together. The diffusion film 141, the first brightness enhancement film 142, and the second brightness enhancement film 143 may have the same shape, and may have a square structure, as shown in fig. 2. Wherein, fig. 1 is a cross-sectional view of the backlight module taken along the position a-a of the light uniformizing element in fig. 2, and the position a-a passes through the light source 15. It is understood that, in the present embodiment, the cross-sectional views of the diffusion film 141, the first brightness enhancement film 142, and the second brightness enhancement film 143 are uniform everywhere as long as they pass through the light source 15.
The first brightness enhancement film 142 can be referred to as a lower brightness enhancement film, and the second brightness enhancement film 143 can be referred to as an upper brightness enhancement film.
The light-shielding fixing layer 16 is disposed on the side surface of the diffusion film 141 close to the light incident surface 133, on the side surface of the first light-adding film 142 close to the light incident surface 133, on the side surface of the second light-adding film 143 close to the light incident surface 133, and on the side surface of the second light-adding film 143 away from the first light-adding film 142.
Further, the adhesive provided on the surface of the light-shielding fixing layer 16 extends from the side surface of the second bright enhancement film 143 away from the first bright enhancement film 142 to the bottom of the side surface of the diffusion film 141 close to the light incident surface, and contacts the light guide plate 13, thereby bonding and fixing the diffusion film 141, the first bright enhancement film 142, and the second bright enhancement film 143 to the light guide plate 13.
The backlight module further includes an FPC (Flexible Printed Circuit) Circuit board 17 and an FPC fixing tape 18. The FPC board 17 is disposed on the light source 15 and electrically connected to the light source 15 to transmit a control signal provided from the outside to the light source 15. Further, the FPC board 17 is disposed at an interval from the light unifying element 14 with a gap a therebetween. The gap a is used for matching assembly errors on one hand, and on the other hand, the backlight module can still be normally used under the condition of certain cold and hot deformation.
The FPC fixing tape 18 is disposed between the FPC circuit board 17 and the light guide plate 13 to fix the FPC circuit board 17 on the light guide plate 13. Specifically, the FPC fixing tape 18 is a tape having an adhesive on both surfaces, and one surface thereof is adhered and fixed to the FPC board 17, and the other surface thereof is adhered and fixed to the light guide plate 13. In this embodiment, the FPC fixing tape 18 may be disposed at an interval from the light uniformizing element 14 to form a part of the gap a.
Further, the backlight module further includes a light-shielding tape 19 disposed on the FPC board 17 and on the second brightness enhancement film 143 in the non-display area 140.
The light shielding tape 19 may include a first light shielding portion 191 and a second light shielding portion 192. The first shading part 191 covers the FPC board 17, and the second shading part 192 covers the second bright enhancement film 143. The thickness of the first light shielding portion 191 may be greater than that of the second light shielding portion 192. The second light-shielding portion 192 shields the portion of the second brightness enhancement film 143 located in the non-display area 140, and applies a suitable force to the second brightness enhancement film 143, so that the diffusion film 141, the first brightness enhancement film 142, and the second brightness enhancement film 143 can be fixed on the light-emitting surface 134 of the light guide plate 13.
Further, the light shielding tape 191 is provided with an adhesive on at least a side surface of the second light shielding portion 192 close to the second bright enhancement film 143, and further fixes the second bright enhancement film 143 by adhesion. As described above, the diffusion film 141, the first brightness enhancement film 142, and the second brightness enhancement film 143 are fixed to the light guide plate 13 by the light-shielding fixing layer 16 by adhering the diffusion film 141, the first brightness enhancement film 142, and the second brightness enhancement film 143 together. Therefore, the present disclosure can save the width of the second light shielding portion 192, and even omit the second light shielding portion 192, thereby increasing the width of the display area.
Further, the backlight module further includes a middle frame 21 and an outer frame 22. The outer frame 22 fixes the light-shielding tape 19 and the FPC board 17 on the side (left side in the figure) of the light-shielding tape 19 and the FPC board 17 away from the second brightness enhancement film 143.
The middle frame 21 is located in the accommodating cavity of the back frame 11, is disposed on a side of the light source 15 away from the light incident surface 133, and is used for supporting the FPC board 17 and the light-shielding tape 19.
The outer frame 22 is located outside the accommodating cavity of the back frame 11. The middle frame 21 and the outer frame 22 may be made of metal, such as iron or aluminum, or plastic. The middle frame 21 may be integrally formed with the outer frame 22.
Referring to fig. 3, fig. 3 is a schematic view illustrating a light shielding principle of a light shielding fixing layer of a backlight module according to a first embodiment of the present application.
As shown in fig. 3, the light ray S1 is originally a light ray directly emitted from the light source 15 through the gap a to cause light leakage in the non-display area 140, and the light ray can be shielded by the light-shielding fixing layer 16 and does not directly exit the backlight module, so as to avoid direct incidence to human eyes. The arrangement of the light-shielding fixing layer 16 does not occupy a separate width space in the width direction, and therefore, the thickness of the non-display area of the backlight module can be reduced. Here, the non-display area is an area covered with the light-shielding tape 19, and the display area is an area not covered with the light-shielding tape 19.
In this embodiment, the diffusion film 141, the first brightness enhancement film 142, and the second brightness enhancement film 143 are independent films, that is, they are not a composite film. In other embodiments, the diffusion film 141, the first brightness enhancement film 142, and the second brightness enhancement film 143 may also be provided as a composite film, for example, the first brightness enhancement film 142 and the second brightness enhancement film 143 are integrated film layers, and the integrated film layer and the diffusion film 141 are independent films. Alternatively, the diffusion film 141, the first brightness enhancement film 142, and the second brightness enhancement film 143 are an integrated film layer.
In addition, the light-shielding fixing layer 16 may be disposed at other positions, for example, at any one or more of the following positions: between the diffusion film 141 and the light guide plate 13, between the diffusion film 141 and the first brightness enhancement film 142, and between the first brightness enhancement film 142 and the second brightness enhancement film 143.
Referring to fig. 4-6, fig. 4 is a schematic cross-sectional structure of a backlight module according to a second embodiment of the present disclosure, which is cut along a C-C direction of the diffuser film and the second brightness enhancement film shown in fig. 6, and fig. 5 is a schematic cross-sectional structure of a backlight module according to a second embodiment of the present disclosure, which is cut along a B-B direction of the diffuser film and the second brightness enhancement film shown in fig. 6. Fig. 6 is a schematic structural view of a diffusion film and a second brightness enhancement film according to a second embodiment of the present application.
First, as shown in fig. 4, in the present embodiment, the backlight module still includes a back frame 41, a reflective sheet 42, a light guide plate 43, a light equalizing element 44, a light source 45, a light shielding fixing layer 46, an FPC circuit board 47, an FPC fixing tape 48, a light shielding tape 49, a middle frame 51, and an outer frame 52. The structures of the back frame 41, the reflective sheet 42, the light guide plate 43, the light source 45, the light-shielding fixing layer 46, the FPC circuit board 47, the light-shielding tape 49, the middle frame 51, and the outer frame 52 are respectively the same as those of the back frame 11, the reflective sheet 12, the light guide plate 13, the light source 15, the light-shielding fixing layer 16, the FPC circuit board 17, the light-shielding tape 19, the middle frame 21, and the outer frame 22, which will not be described herein again.
The FPC fixing tape 48 of the present embodiment further extends from the direction of the FPC board 47 to the direction of the light unifying element 44. Thus, the present embodiment has only the gap b between the FPC board 47 and the light unifying element 44.
The FPC fixing tape 48 may be provided with an adhesive on the upper surface and the lower surface to fix the FPC board 47 to the light guide plate 43, and may be further provided with a black light-shielding material or a black light-shielding material on the upper surface or the lower surface or both surfaces to shield light.
Specifically, the FPC fixing tape 48 may be a black tape. The FPC fixing tape 48 may be provided with a black ink layer on the upper surface or the lower surface or both of the upper surface and the lower surface to shield light. The arrangement of the black ink layer may be the same as that described above, and will not be described herein again.
The light uniformizing element 44 of the present embodiment includes a diffusion film 441, a first brightness enhancement film 442 and a second brightness enhancement film 443, which are sequentially disposed on the light exiting surface of the light guide plate 43. The diffusion film 441, the first brightness enhancement film 442, and the second brightness enhancement film 443 are independent films. That is, the diffusion film 441, the first brightness enhancement film 442, and the second brightness enhancement film 443 are individually completed and then attached together. The first brightness enhancement film 142 can be referred to as a lower brightness enhancement film, and the second brightness enhancement film 143 can be referred to as an upper brightness enhancement film.
Please refer to FIG. 6. The diffusion film 441 includes a diffusion main body 4411 and a diffusion extension portion 4412 extending from the diffusion main body 4411 in the direction of the FPC fixing tape 48. The diffusion body 4411 is attached to the FPC fixing tape 48 at its side as shown in fig. 5. The diffusion extension 4412 is provided on the FPC fixing tape 48 as shown in fig. 4.
The first brightness enhancement film 442 is provided on the diffusion body 4411.
Referring to fig. 6, the second light enhancement film 443 includes a light enhancement main body 4431 disposed on the first light enhancement film 442 and a light enhancement extending portion 4432 extending from the light enhancement main body 4431 to the FPC fixing tape 48, and the light enhancement extending portion 4432 is disposed on the diffusion extending portion 4412, as shown in fig. 4.
The diffusion extension part 4412 and the light intensifying extension part 4432 are both two, and the two diffusion extension parts 4412 are respectively located at both sides of the diffusion film 441. The two light enhancement extension portions 4432 are respectively disposed on two sides of the second light enhancement film 443. In this embodiment, the shapes and positions of the diffusion extension 4412 and the light intensifying extension 4432 may be the same. It should be understood that in other embodiments, the number of diffusion extensions 4412 and light enhancement extensions 4432 may be other, such as one or three, etc.
Here, on both sides of the diffusion film 441 and the second brightness enhancement film 443, that is, the position of the diffusion extension portion 4412 and the position of the brightness enhancement extension portion 4432, the light-shielding fixing layer 46 is disposed on the side surface of the diffusion extension portion 4412 close to the light-incident surface 433, the side surface of the brightness enhancement extension portion 4432 close to the light-incident surface 433, and the side surface of the second brightness enhancement film 4432 far from the light-emitting surface, as shown in fig. 4.
Between both sides, i.e., the position of the diffusion main body 4411 and the position of the light-adding main body 4431, the light-shielding fixing layer 46 is provided on the side surface of the diffusion main body 4411 close to the light-entering surface 433, the side surface of the first light-adding film 442 close to the light-entering surface 433, and the side surface of the light-adding main body 4431 close to the light-entering surface 433.
As described above, the FPC fixing tape 48 of the present embodiment can block the light emitted from the light source 45 from being directly incident on the gap b, thereby preventing the light from leaking out of the gap b. Further, the light-shielding fixing layer 46 can prevent light leakage from other positions of the non-display region 440, and can fix the diffusion film 441, the first brightness enhancement film 442, and the second brightness enhancement film 443.
It should be understood that the diffusion film 441, the first brightness enhancement film 442, and the second brightness enhancement film 443 of the present embodiment can also be a composite structure, which is specifically described above and will not be described herein again.
Similarly, the light-shielding fixing layer 46 of the present embodiment may also be disposed at other positions, as described above, and will not be described herein again.
Referring to fig. 7 and 8, fig. 7 is a schematic cross-sectional structure view of a backlight module according to a third embodiment of the present application, cut along a direction D-D of the first brightness enhancement film shown in fig. 8, and fig. 8 is a schematic structure view of the first brightness enhancement film according to the third embodiment of the present application.
First, as shown in fig. 7, in the present embodiment, the backlight module still includes a back frame 71, a reflective sheet 72, a light guide plate 73, a light equalizing element 74, a light source 75, a light shielding fixing layer 76, an FPC circuit board 77, an FPC fixing tape 78, a light shielding tape 79, a middle frame 81 and an outer frame 82. The structures of the back frame 71, the reflective sheet 72, the light guide plate 73, the light source 75, the light shielding fixing layer 76, the FPC circuit board 77, the light shielding tape 79, the middle frame 81, and the outer frame 82 are respectively the same as those of the back frame 11, the reflective sheet 12, the light guide plate 13, the light source 15, the light shielding fixing layer 16, the FPC circuit board 17, the light shielding tape 19, the middle frame 21, and the outer frame 22, which will not be described herein again.
The FPC fixing tape 78 of the present embodiment further extends from the direction of the FPC board 77 toward the direction of the light uniformizing element 74, and is in contact with the side surface of the diffusion film 741. Thus, the present embodiment has only the gap c between the FPC board 77 and the dodging member 74.
The FPC fixing tape 78 may be provided with an adhesive on the upper surface and the lower surface to fix the FPC board 77 to the light guide plate 73, and may be further provided with a black light shielding material on the upper surface or the lower surface or both to shield light.
Specifically, the FPC fixing tape 78 may be black tape. The FPC fixing tape 78 may be provided with a black ink layer on the upper surface or the lower surface or both of the upper surface and the lower surface to shield light. The arrangement of the black ink layer may be the same as that described above, and will not be described herein again.
The light uniformizing element 74 of the present embodiment includes a diffusion film 741, a first brightness enhancement film 742, and a second brightness enhancement film 743, which are sequentially disposed on the light exiting surface of the light guide plate 73. The diffusion film 741, the first brightness enhancement film 742, and the second brightness enhancement film 743 are independent films. That is, the diffusion film 741, the first brightness enhancement film 742, and the second brightness enhancement film 743 are separately completed and then attached together. The first brightness enhancement film 742 can be referred to as a lower brightness enhancement film and the second brightness enhancement film 743 can be referred to as an upper brightness enhancement film.
Please refer to FIG. 8. The first brightness enhancement film 742 includes a brightness enhancement main body 7421 and a brightness enhancement extension portion 7422 extending from the brightness enhancement main body 7421 in the direction of the FPC fixing tape 48. The brightness enhancement main body 7421 is provided on the diffusion film 741, the brightness enhancement extension 7422 is provided on the FPC fixing tape 48, and the second brightness enhancement film 743 is provided on the brightness enhancement main body 7421. The diffusion film 741, the brightness enhancement body 7421, and the second brightness enhancement film 743 may have the same shape and size.
Two light-increasing extending portions 7422 are provided, and the two light-increasing extending portions 7422 are respectively provided on both sides of the first light-increasing film 742.
The light-shielding fixing layer 76 is disposed on the side of the light-adding extension portion 7422 close to the light-entering surface 733, the side of the diffusion film 741, the side of the second light-adding film 743 close to the light-entering surface 733, the side of the light-adding body 7421 close to the light-entering surface 733, and the side of the second light-adding film 743 away from the light-exiting surface.
It should be appreciated that fig. 7 is a schematic cross-sectional view of fig. 8 cut along the direction of the light enhancing extension 7422 of the first light enhancing film 742, i.e., the D-D cross-section line shown in the figure. If the cross-sectional structure of the first brightness enhancement film 742 cut along the direction of the brightness enhancement body 7421 is the same as that of fig. 5, it will not be described again.
As described above, the FPC fixing tape 78 of the present embodiment can block the light emitted from the light source 75 from being directly incident into the gap c, thereby preventing the light from leaking out of the gap c. Further, the light-shielding fixing layer 76 can prevent light leakage at other positions of the non-display region, and can fix the diffusion film 741, the first brightness enhancement film 742, and the second brightness enhancement film 743.
It should be understood that the diffusion film 741, the first brightness enhancement film 742 and the second brightness enhancement film 743 of this embodiment can also be a composite structure, which is specifically described above and will not be described herein again.
Similarly, the light-shielding fixing layer 76 of the present embodiment may also be disposed at other positions, as described above, and will not be described herein again.
Referring to fig. 9, fig. 9 is an exploded schematic view of an electronic device according to an embodiment of the disclosure. In this embodiment, the electronic device 90 may be a smart phone, and in other embodiments, the electronic device may also be a tablet computer, a palm computer, a smart watch, and the like.
In the present embodiment, the electronic device 90 includes a rear case 91, a middle frame 92, a backlight module 93, a display module 94 and a cover plate 95.
The middle frame 92 is fixedly connected to the rear case 91.
The display module 94 is stacked on the backlight module 93, and the display module 94 and the backlight module 93 are fixed to the middle frame 92.
The backlight module 93 is used for providing backlight for the display module 94.
The display module 94 may be a liquid crystal display panel or other display panel.
The cover plate 95 covers the display module 94. The cover 95 may be a transparent glass cover, and in the non-display area, the cover 95 may be opaque. For example, the cover plate 95 is coated with a light-shielding ink in the non-display area.
It is to be understood that other structures of the electronic device, such as a circuit board, etc., may be provided between the rear case 91 and the middle frame 92, and will not be specifically described herein since the present application is not directed to improvements of these components.
In other embodiments, the electronic device 90 may have other structures, and the description of the structure of the electronic device 90 is not intended to limit the scope of the present application.
The above description is only for the purpose of illustrating embodiments of the present application and is not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings of the present application or are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.
Claims (6)
1. A backlight module is characterized in that the backlight module comprises:
the light guide plate comprises a light incident surface and a light emergent surface;
the light source is arranged at an interval with the light incident surface;
the light homogenizing element is arranged in the non-display area at one end close to the light inlet face and comprises a diffusion film, a first light enhancement film and a second light enhancement film which are sequentially arranged on the light outlet face;
the shading fixing layer is arranged on the side face, far away from the first brightness enhancement film, of the second brightness enhancement film and on the side faces, close to the light incident face, of the diffusion film, the first brightness enhancement film and the second brightness enhancement film, and the shading fixing layer is a black ink layer with an adhesive on the surface and used for fixing the light homogenizing element and preventing the light leakage of the non-display area;
an FPC board disposed on and electrically connected with the light source;
the FPC fixing adhesive tape is arranged between the FPC circuit board and the light guide plate so as to fix the FPC circuit board on the light guide plate, and comprises an adhesive and a black shading material, wherein the adhesive is used for connecting the FPC circuit board with the light guide plate, and the black shading material is used for shading light;
the diffusion film comprises a diffusion main body arranged on the light-emitting surface and two diffusion extension parts extending from the diffusion main body to the FPC fixing adhesive tape, the two diffusion extension parts are respectively positioned on two sides of the diffusion film, the side surface of the diffusion main body is connected with the FPC fixing adhesive tape, and the diffusion extension parts are arranged on the FPC fixing adhesive tape;
the first brightness enhancement film is arranged on the diffusion main body;
the second light enhancement film comprises two light enhancement main bodies arranged on the first light enhancement film and light enhancement extending portions extending from the light enhancement main bodies to the FPC fixing adhesive tape, the two light enhancement extending portions are respectively positioned on two sides of the light enhancement main bodies, and the light enhancement extending portions are arranged on the diffusion extending portions;
the shading fixing layer is arranged on the side face, close to the light incoming face, of the diffusion extending portion, the light intensifying extending portion is close to the side face of the light incoming face, the diffusion main body is close to the side face of the light incoming face, the first light intensifying film is close to the side face of the light incoming face, the light intensifying main body is close to the side face of the light incoming face, the second light intensifying film is far away from the side face of the light outgoing face, and the shading fixing layer is arranged on the side face of the diffusion extending portion, close to the light incoming.
2. The backlight module as claimed in claim 1, wherein the black ink layer is formed by a screen printing process.
3. The backlight module as claimed in claim 1, wherein the diffuser film, the first brightness enhancement film and the second brightness enhancement film are independent films.
4. The backlight module as claimed in claim 1, wherein the first and second brightness enhancement films are integrated films, and the integrated films and the diffusion film are independent films.
5. The backlight module according to claim 1, further comprising a light-shielding tape disposed on the second light-adding film for fixing the second light-adding film.
6. An electronic device, characterized in that the electronic device comprises the backlight module of any one of claims 1-5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810105870.3A CN108227071B (en) | 2018-01-31 | 2018-01-31 | Backlight module and electronic device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810105870.3A CN108227071B (en) | 2018-01-31 | 2018-01-31 | Backlight module and electronic device |
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| Publication Number | Publication Date |
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| CN108227071A CN108227071A (en) | 2018-06-29 |
| CN108227071B true CN108227071B (en) | 2020-07-03 |
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| CN201810105870.3A Expired - Fee Related CN108227071B (en) | 2018-01-31 | 2018-01-31 | Backlight module and electronic device |
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| CN112965294B (en) * | 2021-03-01 | 2023-06-30 | Oppo广东移动通信有限公司 | Backlight module and electronic equipment |
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| JP5091602B2 (en) * | 2007-09-25 | 2012-12-05 | 株式会社ジャパンディスプレイセントラル | Surface light source device and liquid crystal display device using the same |
| US8864361B2 (en) * | 2011-08-15 | 2014-10-21 | Japan Display Inc. | Display device |
| CN104949011A (en) * | 2015-07-07 | 2015-09-30 | 京东方光科技有限公司 | Backlight module and display device |
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| JP4055741B2 (en) * | 2004-05-24 | 2008-03-05 | セイコーエプソン株式会社 | Electro-optical device and electronic apparatus |
| TWI460497B (en) * | 2012-05-10 | 2014-11-11 | Au Optronics Corp | Display module |
| CN202813236U (en) * | 2012-09-18 | 2013-03-20 | Tcl显示科技（惠州）有限公司 | Light leakage preventing black and white double-sided adhesive tape, backlight module and liquid crystal display device |
| CN202884679U (en) * | 2012-10-08 | 2013-04-17 | 京东方科技集团股份有限公司 | Light-leaking-proof backlight body and liquid crystal display module thereof |
| JP5532104B2 (en) * | 2012-10-18 | 2014-06-25 | オムロン株式会社 | Surface light source device, liquid crystal display device, and mobile device |
| CN203240403U (en) * | 2013-04-02 | 2013-10-16 | 深圳Tcl新技术有限公司 | Backlight module and LCD (liquid crystal display) device |
| CN104848088A (en) * | 2015-05-13 | 2015-08-19 | 武汉华星光电技术有限公司 | Backlight module and liquid crystal display |
| CN104964213B (en) * | 2015-07-14 | 2018-06-08 | 武汉华星光电技术有限公司 | Backlight module and liquid crystal display |
| CN106200128B (en) * | 2016-09-14 | 2019-08-13 | 武汉华星光电技术有限公司 | Quantum dot backlight module and display device |
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2018
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5091602B2 (en) * | 2007-09-25 | 2012-12-05 | 株式会社ジャパンディスプレイセントラル | Surface light source device and liquid crystal display device using the same |
| US8864361B2 (en) * | 2011-08-15 | 2014-10-21 | Japan Display Inc. | Display device |
| CN104949011A (en) * | 2015-07-07 | 2015-09-30 | 京东方光科技有限公司 | Backlight module and display device |
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Address after: Changan town in Guangdong province Dongguan 523860 usha Beach Road No. 18 Applicant after: GUANGDONG OPPO MOBILE TELECOMMUNICATIONS Corp.,Ltd. Address before: Changan town in Guangdong province Dongguan 523860 usha Beach Road No. 18 Applicant before: GUANGDONG OPPO MOBILE TELECOMMUNICATIONS Corp.,Ltd. |
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