CN112485859B - Backlight module and display device - Google Patents
Backlight module and display device Download PDFInfo
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- CN112485859B CN112485859B CN202011577015.6A CN202011577015A CN112485859B CN 112485859 B CN112485859 B CN 112485859B CN 202011577015 A CN202011577015 A CN 202011577015A CN 112485859 B CN112485859 B CN 112485859B
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- guide plate
- light
- light guide
- prism
- backlight module
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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
- G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
- G02B5/021—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
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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
- G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
Abstract
The invention discloses a backlight module and a display device, wherein the backlight module comprises: the light source assembly is positioned on at least one side of the light guide plate, the light emitting surface of the light source assembly faces the light incident surface of the light guide plate, and the brightness enhancement film is positioned on one side of the light emitting surface of the light guide plate; the backlight module comprises a through hole, the through hole penetrates through the light guide plate and the brightness enhancement film, and the hole wall of the through hole comprises an outer hole wall close to the light source component; the membrane that adds lustre to includes substrate layer and prism layer, and the prism layer is located the one side that the light guide plate was kept away from to the substrate layer, and the prism layer includes a plurality of parallel arrangement's prism strip, and at least one prism strip is including the first terminal surface towards outside pore wall, and first terminal surface orientation is from one side of substrate layer, and at least one first terminal surface has first contained angle alpha with light guide plate place plane, and alpha is the acute angle. The first end face and the plane of the light guide plate form an acute angle, so that the light path passing through the first end face of the prism strip is changed, the light condensation effect of the prism strip at the first end face is damaged, and the problem that a bright band is easily generated at the through hole of the backlight module is solved.
Description
Technical Field
The invention relates to the technical field of display, in particular to a backlight module and a display device.
Background
With the development of display technology, in the current display device such as mobile phone design, the requirement for screen occupation is higher and higher, that is, the area ratio of the display area of the display device to the non-display area is larger and larger, the existing display device usually can open a hole in a backlight module to place a camera, the frame of the display device is narrower due to the opening design, but at the position facing a light source, because the light source directly irradiates, a bright band inevitably appears in a certain area, at the position facing away from the light source, because the light source cannot directly irradiate, a dark band appears in a certain area, the condition of uneven light is caused, and the display is uneven.
Disclosure of Invention
In view of the above, the present invention provides a backlight module and a display device, so as to solve the problem of occurrence of bright stripes at through holes.
On one hand, the invention provides a backlight module which comprises a light guide plate, a brightness enhancement film and a light source assembly, wherein the light source assembly is positioned on at least one side of the light guide plate, the light emitting surface of the light source assembly faces to the light incident surface of the light guide plate, and the brightness enhancement film is positioned on one side of the light emitting surface of the light guide plate;
the backlight module comprises a through hole, the through hole penetrates through the light guide plate and the brightness enhancement film, and the hole wall of the through hole comprises an outer hole wall close to the light source component;
the membrane that adds lustre to includes substrate layer and prism layer, the prism level is in the substrate layer is kept away from one side of light guide plate, the prism layer includes a plurality of parallel arrangement's prism strip, at least one the prism strip is including the orientation the first terminal surface of outer pore wall, first terminal surface orientation is kept away from dorsad one side of substrate layer, at least one first terminal surface with light guide plate place plane has first contained angle alpha, and wherein alpha is the acute angle.
On the other hand, the invention also provides a display device which comprises the backlight module and a display panel arranged opposite to the backlight module, wherein the display panel is positioned on one side of the light-emitting surface of the backlight module.
Compared with the prior art, the backlight module and the display device provided by the invention at least realize the following beneficial effects:
the backlight module is a side-in type backlight, the light source assembly is positioned on at least one side of the light guide plate, the brightness enhancement film is positioned on one side of the light emitting surface of the light guide plate, the backlight module is provided with a through hole, the through hole penetrates through the light guide plate and the brightness enhancement film, the prism layer of the brightness enhancement film comprises a plurality of prism strips which are arranged in parallel, at least one prism strip comprises a first end surface facing the outer hole wall of the through hole, at least one first end surface and the plane where the light guide plate is positioned have a first included angle which is an acute angle, so that the prism strips on the first end surface do not have the light condensation function any more, light emitted by the light source assembly is reflected and scattered on the first end surface, the reflected light enters the side surface of the prism strip far away from the base material layer, the reflected light enters the side surface of the prism strip and then emits to one side of the light guide plate, the light condensation function of the prism strips on the first end surface is weakened, and the light emitting brightness of the first end surface is reduced, thereby improving the bright band at the outer hole wall of the through hole.
Of course, it is not necessary for any product in which the present invention is practiced to achieve all of the above-described technical effects simultaneously.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
FIG. 1 is a schematic plan view of a backlight module according to the present invention;
FIG. 2 is an enlarged view of a portion of the area M of FIG. 1;
FIG. 3 is a partial perspective view of the backlight module shown in FIG. 2;
FIG. 4 is a cross-sectional view taken along line A-A' of FIG. 3;
FIG. 5 is a cross-sectional view of the plane through the Y-axis and Z-axis of FIG. 3;
FIG. 6 is a further enlarged fragmentary view of region M of FIG. 1;
FIG. 7 is a further cross-sectional view of the plane through the Y-axis and Z-axis of FIG. 3;
FIG. 8 is a further enlarged fragmentary view of region M of FIG. 1;
FIG. 9 is a further cross-sectional view of the plane through the Y-axis and Z-axis of FIG. 3;
FIG. 10 is a further cross-sectional view of the plane through the Y-axis and Z-axis of FIG. 3;
FIG. 11 is a partial perspective view of the backlight module shown in FIG. 2;
fig. 12 is a schematic structural view of a brightness enhancement film provided by the present invention;
FIG. 13 is an enlarged view of a portion of the area N in FIG. 1;
FIG. 14 is a cross-sectional view taken along line C-C' of FIG. 13;
FIG. 15 is a schematic plan view of a display device according to the present invention;
FIG. 16 is a cross-sectional view taken along line K-K' of FIG. 15.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
Referring to fig. 1, fig. 1 is a schematic plan view illustrating a backlight assembly according to the present invention, fig. 2 is a partially enlarged view of a region M in fig. 1, fig. 3 is a partially perspective view illustrating the backlight assembly in fig. 2, fig. 3 is a cross-sectional view taken along a-a' direction in fig. 3, and fig. 5 is a cross-sectional view taken along a plane passing through Y and Z axes in fig. 3.
The backlight module 100 comprises a light guide plate 1, a brightness enhancement film 2 and a light source assembly 3, wherein the light source assembly 3 is positioned on at least one side of the light guide plate 1, a light emitting surface of the light source assembly 3 faces to a light incident surface of the light guide plate 1, and the brightness enhancement film 2 is positioned on one side of the light emitting surface of the light guide plate 1;
the backlight module 100 comprises a through hole 4, the through hole 4 penetrates through the light guide plate 1 and the brightness enhancement film 2, and the hole wall of the through hole 4 comprises an outer hole wall 41 close to the light source component 3;
the brightness enhancement film 2 comprises a substrate layer 5 and a prism layer 6, the prism layer 6 is located on one side, away from the light guide plate 1, of the substrate layer 5, the prism layer 6 comprises a plurality of prism strips 7 which are arranged in parallel, at least one prism strip 7 comprises a first end face 8 facing to the outer hole wall 41, the first end face 8 faces to one side facing away from the substrate layer 5, at least one first end face 8 and the plane where the light guide plate 1 is located have a first included angle alpha, and the alpha is an acute angle.
It should be noted that, in this embodiment, the backlight module 100 at least includes the light guide plate 1 and the light source assembly 3, the light source assembly 3 is located on at least one side of the light guide plate 1, and the light emitting surface of the light source assembly 3 faces the light incident surface of the light guide plate 1, the light source assembly 3 can be, for example, an LED light bar, and includes a printed circuit board (not shown in the figure) and a plurality of LEDs installed and electrically connected on the printed circuit board, the light emitting surfaces of the LEDs can be opposite to the light incident surface of the light guide plate 1, light guide points are disposed on the light guide plate 1, and are diffused towards various angles after incident light irradiates on each light guide point on the light guide plate 1, and then the incident light is emitted from the light emitting surface (front) of the light guide plate 1 under the destructive reflection condition, and uniform light emission can be realized on the light emitting surface of the light guide plate 1 through the light guide points with various densities and sizes.
Fig. 1 only shows the condition that the light source assembly 3 is only located on one side of the light guide plate 1, the light source assembly 3 extends along the first direction X, the light source assembly 3 is arranged opposite to the light guide plate 1 in the second direction X, the light source assembly 3 is not arranged on the other side of the light guide plate 1, at this time, the light guide plate 1 has one end facing the light source assembly 3 and one end far away from the light source assembly 3 in the second direction X, the brightness enhancement film 2 is located on one side of the light emitting surface of the light guide plate 1, and therefore, the brightness enhancement film also has one end facing the light source assembly 3 and one end far away from the light source assembly 3.
The backlight module 100 is provided with at least one through hole 4 penetrating through the bottom surface and the light emitting surface of the light guide plate 1, the through hole 4 penetrates through the light guide plate and the brightness enhancement film, and the shape of the through hole 4 may include, for example, a circle, a rectangle, and other regular or irregular shapes, and the embodiment is described by taking a circle as an example. In the second direction Y, the hole wall of the through hole 4 includes an outer hole wall disposed toward the light source assembly 3. At the subregion of light guide plate 1 that is close to the outer pore wall, it is located between light source subassembly 3 and the through-hole 4, and the light that light source subassembly 3 sent can directly shine this region, because the influence of through-hole 4, shines the one end diffusion of further keeping away from light source subassembly 3 that can not be normal to this regional light, forms the bright band.
It is understood that the propagation of the light emitted from the light source module 3 in the light guide plate 1 is the law of reflection and refraction, and no matter what shape of the through hole 4 is encountered, a certain degree of attenuation is necessarily achieved, such that a bright band is formed on the side of the through hole 4 close to the light source module 3, and a dark band is formed on the side of the through hole 4 far from the light source module 3, although the bright band is relative to the dark band.
Fig. 2 only shows that one prism stripe 7 includes a first end surface 8 facing the outer hole wall 41, the first end surface 8 faces a side away from the substrate layer 5, and schematically shows a case that one first end surface 8 has a first included angle α with a plane of the light guide plate 1, where the first included angle α is an acute angle, that is, the first end surface 8 inclines to a side of the light source assembly 3, and the prism stripe is not pattern-filled in fig. 2.
It should be noted that, referring to fig. 3 and fig. 5, the first included angle α refers to an included angle between the first end surface 8 and the plane where the light guide plate 1 is located on any plane passing through the Y axis and the Z axis, and certainly, since the included angles between the positions of the first end surface 8 and the plane where the light guide plate 1 is located may be different, the included angles between the first end surface 8 and the plane where the light guide plate 1 is located in the same prism strip 7 may also exhibit different laws, but it is required to satisfy that the first included angle α is an acute angle.
Referring to fig. 4, light emitted from the light source assembly 3 enters the brightness enhancement film 2 after passing through the light guide plate 1, and when the first end surface is not disposed on the prism strip 7 (dotted line portion in fig. 4), the light with a large viewing angle is focused to a small viewing angle, and the luminous flux in the unit space is increased, as shown by light rays L1 and L2 in fig. 4, the light is focused, and the light is emitted as L3 and L4, and L3 and L4 are focused toward the vertex angle of the prism strip 7, so that the brightness enhancement film 2 plays a role of brightness enhancement.
In the invention, light emitted by the light source assembly 3 enters the brightness enhancement film 2 after passing through the light guide plate 1, when the first end face 8 is arranged on the prism strip 7, and when the light L1 and the light L2 pass through the first end face 8 on the prism strip 7, scattering occurs because the first included angle α between the first end face 8 and the direction of the plane where the light guide plate 1 is located is an acute angle, as shown in L5 and L6 in fig. 4, the amount of light of the prism strip 7 towards one side of the outer hole wall can be reduced, and the brightness of a bright band is reduced.
Referring to fig. 5, light emitted from the light source assembly 3 enters the brightness enhancement film 2 after passing through the light guide plate 1, and when the first end surface is not disposed on the prism strip 7, the light L7 is emitted along the direction of L8 to be focused, so that light with a large viewing angle is focused to a small viewing angle, the luminous flux in a unit space is increased, and the brightness enhancement effect is achieved.
Light that light source subassembly 3 sent enters membrane 2 of adding lustre to behind light guide plate 1, when setting up first terminal surface 8 on prism strip 7, when light L7 passes through first terminal surface 8, because first terminal surface 8 is the acute angle with the first contained angle alpha of the planar direction in light guide plate 1 place, so can take place to reflect at first terminal surface 8 and enter into on the side 7a of prism strip 7 along the direction of light L9, take place to reflect again on the side 7a of prism strip 7, and return to light guide plate 1 along the direction of light L10, the light quantity of prism strip 7 towards outside pore wall one side has also been reduced like this, the luminance of bright band has been reduced.
Compared with the prior art, the backlight module in the embodiment at least has the following beneficial effects:
the backlight module 100 of the invention is a side-in type backlight, the light source assembly 3 is positioned at least one side of the light guide plate 1, the brightness enhancement film 2 is positioned at one side of the light-emitting surface of the light guide plate 1, the backlight module 100 is provided with a through hole 4, the through hole 4 penetrates through the light guide plate 1 and the brightness enhancement film 2, the prism layer 6 of the brightness enhancement film 2 comprises a plurality of prism strips 7 which are arranged in parallel, at least one prism strip 7 comprises a first end surface 8 facing the outer hole wall 41 of the through hole 4, at least one first end surface 8 and the plane where the light guide plate 1 is positioned have a first included angle alpha, and the first included angle alpha is an acute angle, so that the prism strips 7 on the first end surface 8 do not have the function any more, the light emitted by the light source assembly 3 can be reflected and scattered at the first end surface 8, the reflected light enters the side surface 7a of the prism strip 7 far away from the substrate layer side, the side surface 7a of the prism strip 7 is totally reflected and then enters the side of the light guide plate 1, thereby, the light-gathering effect of the prism strip 7 at the first end surface 8 is weakened, the light-emitting brightness of the first end surface 8 is reduced, and the bright band at the outer hole wall 41 of the through hole 4 is improved.
In some alternative embodiments, with reference to fig. 6, and with continuing reference to fig. 3-5, fig. 6 is a further enlarged partial view of the region M of fig. 1. In fig. 6, the first end surfaces 8 of the plurality of prism strips 7 facing the outer hole wall 41 and the plane of the light guide plate 1 all have acute angles.
In fig. 6, the prism bars are not pattern-filled.
As can be seen from the above, the included angle between the first end surface 8 and the plane where the light guide plate 1 is located is an acute angle, the prism strip 7 on the first end surface 8 no longer has a light condensing effect, the light emitted by the light source assembly 3 can be reflected and scattered at the first end surface 8, the reflected light enters the side surface 7a of the prism strip 7 far away from the substrate layer, the side surface 7a of the prism strip 7 is totally reflected and emits to one side of the light guide plate 1, so that the light condensing effect of the prism strip 7 at the first end surface 8 is weakened, the light-emitting brightness of the first end surface 8 is reduced, and the bright band at the outer hole wall 41 of the through hole 4 is improved, referring to fig. 6, when the included angles between the first end surfaces 8 of all the prism strips 7 facing the outer hole wall 41 and the plane where the light guide plate 1 is located are acute angles, the bright band at the outer hole wall 41 of the through hole 4 can be further improved.
In some alternative embodiments, with continuing reference to fig. 5 and with further reference to fig. 7, fig. 7 is a further cross-sectional view of the plane through the Y-axis and the Z-axis of fig. 3. In fig. 5, the first end surface 8 is a flat surface, and in fig. 7, the first end surface 8 is a curved surface that is curved toward the light-emitting surface of the light guide plate 1.
It should be noted that, the first end surface 8 is a curved surface that is curved toward the light exit surface of the light guide plate 1, which means that the included angles between any position on the first end surface 8 and the plane where the light guide plate 1 is located may not be equal, but are all acute angles. When the first end surface 8 is a curved surface that is curved toward one side of the light-emitting surface of the light guide plate 1, light is more favorably scattered and reflected on the first end surface 8, the brightness of the emitted light at the outer hole wall 41 of the through hole 4 is favorably reduced, and the problem of bright bands is solved.
It can be understood that no matter the first end surface 8 is a straight surface, or the first end surface 8 is a curved surface that is curved towards one side of the light-emitting surface of the light guide plate 1, light rays emitted by the light source assembly 3 can be reflected and scattered at the first end surface 8, the light condensation effect of the prism strips 7 at the first end surface 8 is weakened, the light-emitting brightness of the first end surface 8 is reduced, and therefore the bright band at the outer hole wall 41 of the through hole 4 is improved.
In some alternative embodiments, referring to FIG. 8 and with continued reference to FIG. 1, FIG. 8 is a further enlarged partial view of the area M of FIG. 1. The outer aperture wall 41 extends along a first direction X, the outer aperture wall 41 includes a middle area 411 and edge areas 412, the edge areas 412 are located at two sides of the middle area 411 along the first direction X, the outer aperture wall 41 includes a midpoint O, a midline passing through the midpoint O is perpendicular to the extending direction of the light source assembly 3, the midpoint O is located in the middle area 411, and the first included angle α gradually increases in a direction from the middle area 411 to the edge areas 412.
In fig. 8, the prism bars are not pattern-filled.
In the embodiment where the through hole 4 is circular, the central line passing through the central point O of the outer hole wall 41 is perpendicular to the extending direction of the light source assembly 3, the central point O is located in the middle area 411, and since the middle area 411 is closer to the light source assembly 3 than the edge area 412, the attenuation degree of the light emitted from the light source assembly 3 reaching the middle area 411 and the edge area 412 is different, specifically, the attenuation degree is smaller as the distance from the light source assembly 3 is closer, the attenuation degree is larger as the distance from the light source assembly 3 is closer, so that the middle area 411 is brighter and the edge area 412 is relatively darker as the bright band formed at the outer hole wall 41 is closer. Corresponding to the direction from the middle area 411 to the edge area 412 in this embodiment, the larger the first included angle α is, it can be understood that the smaller the first included angle α is, the more the first end surface 8 inclines to one side of the light guide plate, which is more favorable for the reflection and scattering of light, and reduces the brightness of the bright band, the larger the first included angle α is, the closer the included angle between the first end surface 8 and the light guide plate is to 90 °, when the included angle between the first end surface 8 and the light guide plate is 90 °, the prism strip plays a role in condensing light, and is more unfavorable for the reflection and scattering of light, and is unfavorable for reducing the brightness of the bright band. In fig. 8, a first included angle α between the first end surface 8 in the middle area 411 and the plane of the light guide plate includes a first included angle α 1 and a first included angle α 2, and a first included angle α between the first end surface 8 and the plane of the light guide plate in the edge area 412 includes a first included angle α 3, a first included angle α 4, a first included angle α 5 and a first included angle α 6, and since the brightness of the bright band in the edge area 412 is smaller than the brightness of the bright band in the middle area 412, the first included angle α 3, the first included angle α 4, the first included angle α 5 and the first included angle α 6 can be smaller than the first included angle α 1 and the first included angle α 2, and the brightness of the bright band gradually decreases with increasing distance from the middle area 411, that is, α 1 < α 3 < α 4, α 2 < α 5 < α 6.
In some alternative embodiments, referring to fig. 9 and 10, fig. 9 is a further cross-sectional view of the plane through the Y-axis and the Z-axis in fig. 3, and fig. 10 is a further cross-sectional view of the plane through the Y-axis and the Z-axis in fig. 3, the first end face 8 comprising a plurality of grooves 81 and/or protrusions 82.
Fig. 9 only shows that the first end surface has a plurality of grooves 81, fig. 10 only shows that the first end surface 8 has a plurality of protrusions 82, and certainly, the grooves 81 and the protrusions 82 may also be simultaneously arranged on the first end surface 8, which is not shown in the figure, it can be understood that light is scattered at the grooves or the protrusions, and the light is transmitted to different directions, so as to avoid convergence of the light, thereby avoiding the phenomenon of bright bands due to higher brightness at the positions. According to the invention, the first included angle is formed between the first end surface 8 and the plane of the light guide plate 1, the first included angle is an acute angle, the prism strip 7 on the first end surface 8 does not have a light condensation effect any more, light emitted by the light source assembly 3 can be reflected and scattered on the first end surface 8, the first end surface 8 is provided with the groove 81 or the protrusion 82, the surface of the first end surface 8 is rough, the scattering of the light is facilitated, and the brightness of a bright band can be reduced.
In some alternative embodiments, with continuing reference to fig. 2 and fig. 11, fig. 11 is a partial perspective view of the backlight module shown in fig. 2, fig. 11 has only one prism strip, one side of the substrate layer 5 close to the outer hole wall 41 includes a second end face 9, the second end face 9 is integrally formed by cutting with the first end face 8, the second end face 9 has a second included angle with the plane of the light guide plate 1, and the second included angle is equal to the first included angle.
It can be understood that what destroys the light gathering effect of prism strip 7 is first end face 8, the bigger area of first end face 8 is, the more can destroy the light gathering effect of prism strip 7, and the manufacturing method of first end face 8 is that one side that prism strip 7 is close to the through-hole is chamfered and formed, second end face 9 is cut with first end face 8 is integrative to be formed, second end face 9 and the plane that light guide plate 1 is located have the second contained angle, the second contained angle is equal to first contained angle, namely second end face 9 is the same with the degree of inclination of first end face 8, or second end face 9 is in the plane that first end face 8 is located, namely first end face 8 is cut to substrate layer 5, can guarantee like this that the area of first end face 8 reaches the maximize, be favorable to destroying the light gathering effect of prism strip 7, be favorable to the reflection and the scattering of light, reduce the luminance of bright band.
In some optional embodiments, referring to fig. 12, fig. 12 is a schematic structural diagram of a brightness enhancement film provided by the present invention, the brightness enhancement film 2 includes a first brightness enhancement film 21 and a second brightness enhancement film 22, the second brightness enhancement film 22 is located on a side of the first brightness enhancement film 21 away from the light guide plate 1, the prism bar 7 of the first brightness enhancement film 21 is a first prism bar 71, the prism bar 7 of the second brightness enhancement film 22 is a second prism bar 72, and the first prism bar 71 and/or the second prism bar 72 have a first end surface.
In fig. 12, the brightness enhancement film 2 and the light guide plate 1 are not pattern-filled.
Fig. 12 only shows that the second prism strips 72 have the first end surface 8 on the side facing the outer hole wall (not shown in the figure), the included angle between the first end surface 8 and the plane where the light guide plate 1 is located is an acute angle, and the second prism strips 72 no longer have the light-focusing function on the first end surface 8, so that the brightness of the bright band is reduced. Certainly, the first prism strip 71 may also have a first end surface 8 on one side facing the outer hole wall, an included angle between the first end surface 8 and the plane where the light guide plate is located is an acute angle, and the first prism strip 71 no longer has a light-gathering effect on the first end surface 8, so that the brightness of a bright band is reduced; certainly, the first end surface 8 may be arranged on one side of each of the first prism strip 71 and the second prism strip 72 facing the outer hole wall, and an included angle between the first end surface 8 and the plane where the light guide plate is located is an acute angle, so that the first prism strip 71 and the second prism strip 72 on the first end surface 8 do not have a light condensing effect any more, and the brightness of a bright band is reduced.
In some alternative embodiments, with continued reference to fig. 12, the direction of extension of the first prism bars 71 is perpendicular to the direction of extension of the second prism bars 72.
It can be understood that, the upper and lower first prism strips 71 and the second prism strip 72 are used in an orthogonal manner, and by using the scattering effect of the dots on the light guide plate 1, an outgoing light beam of about 60 ° is generated, and then by using the scattering refraction effect of the lower diffusion sheet, the outgoing light beam is changed into an outgoing light beam of 30 °, and the outgoing light beam passes through the first prism strip 71 and the second prism strip 72, so that the normal direction of the light beam is concentrated to the display panel, and thus, by the two orthogonal prism sheets, components on the light surface are concentrated to the normal direction, thereby improving the brightness, and the extending direction of the first prism strip 71 is perpendicular to the extending direction of the second prism strip 72, which is beneficial to improving the light brightness.
In some alternative embodiments, with continued reference to fig. 12, first prism bars 71 have a first apex angle θ 1 on a side away from substrate layer 5, and second prism bars 72 have a second apex angle θ 2 on a side away from substrate layer 5, where first apex angle θ 1 is equal to second apex angle θ 2.
It can be understood that the first prism stripes 71 and the second prism stripes 72 are triangular prism structures, and have two side surfaces 7a facing away from the side of the substrate layer 5, the two side surfaces 7a form a vertex angle, the vertex angle formed by the two side surfaces 7a in the first prism stripes 71 is a first vertex angle θ 1, the vertex angle formed by the two side surfaces 7a in the second prism stripes 72 is a second vertex angle θ 1, and the first vertex angle θ 1 and the second vertex angle θ 2 are equal to each other, so that components on the smooth surface can be concentrated in the normal direction, and the brightness is improved.
In some alternative embodiments, with continued reference to FIG. 5, 30 ≦ α ≦ 60.
It can be understood that, the planar contained angle of first terminal surface 8 and light guide plate 1 place can not too big also can not the undersize, be unfavorable for the preparation when the undersize, the prism strip that needs to cut off to one side can be too much, first terminal surface 8 can be great and make the prism strip can not play the effect that improves luminance in the planar orthographic projection width in light guide plate place promptly along second direction Y, certainly can not too big, can not play the effect that reduces luminance when first terminal surface 8 and light guide plate 1 place planar contained angle is great, 30 ≦ alpha ≦ 60 can not influence the prism strip and improve luminance promptly, also can not make first terminal surface 8 can not reduce the effect of bright band luminance.
In some alternative embodiments, with continuing reference to fig. 1, and with continuing reference to fig. 13 and 14, fig. 13 is an enlarged view of a portion of region N of fig. 1, and fig. 14 is a cross-sectional view taken along line C-C' of fig. 13. The light source assembly 3 is only located one side of the light guide plate 1, the hole wall of the through hole 4 comprises a rear hole wall 42 which faces away from the light source assembly 3, the end face, facing the rear hole wall 42, of the prism strip 7 is a third end face 10, and the included angle between the third end face 10 and the plane where the light guide plate 1 is located is a right angle.
In this embodiment, the light source assembly 3 is only disposed at the lower frame, that is, the light source assembly 3 is only disposed at one side of the light guide plate 1, and an included angle between the third end surface 10 of the prism strip 7 facing the rear hole wall 42 and the plane where the light guide plate 1 is located is a right angle, that is, the prism strip at the third end surface 10 still has a light-gathering effect.
It can be known from the above that, the propagation of the light emitted from the light source assembly 3 in the light guide plate 1 is a law of reflection and refraction, and no matter what shape of the through hole 4 is encountered, the attenuation must be achieved to a certain degree, so that a bright band is formed on the side of the through hole 4 close to the light source assembly 3, and a dark band is formed on the side of the through hole 4 away from the light source assembly 3, in this embodiment, the brightness of the dark band is not changed, that is, the included angle between the third end surface 10 of the prism strip 7 facing the rear hole wall 42 and the plane where the light guide plate 1 is located is a right angle, the prism strip at the third end surface 10 still has a light-gathering effect, and the brightness of the bright band is reduced, that is, the first end surface 8 facing the outer hole wall 41 and the plane where the light guide plate 1 is located have a first included angle α, and the first included angle α is an acute angle, so that the prism strip 7 does not have a light-gathering effect on the first end surface 8, thereby reducing the bright band at the outer hole wall 41 of the through hole 4, and thus achieving the purpose that the brightness of the outer hole wall 41 and the rear hole wall 42 is substantially the same, the through-hole 4 does not have the difference problem of the bright band and the dark band.
The present embodiment further provides a display device 100, which includes the backlight module 100 as described above, and a display panel 200 disposed opposite to the backlight module 100, wherein the display panel 200 is located at one side of the light emitting surface of the backlight module 100. Referring to fig. 15 and 16, fig. 15 is a schematic plan view of a display device according to the present invention, and fig. 16 is a cross-sectional view taken along direction K-K' in fig. 15. The embodiment of fig. 15 is only an example of a mobile phone, and the display device 1000 is described, it should be understood that the display device provided in the embodiment of the present invention may be other display devices with a display function, such as a computer, a television, a vehicle-mounted display panel, and the present invention is not limited to this specifically. The display device provided in the embodiment of the present invention has the beneficial effects of the display panel provided in the embodiment of the present invention, and specific reference may be made to the specific description of the array substrate in each of the above embodiments, which is not repeated herein.
By the embodiment, the backlight module and the display device provided by the invention at least realize the following beneficial effects:
the backlight module is a side-in type backlight, the light source assembly is positioned on at least one side of the light guide plate, the brightness enhancement film is positioned on one side of the light emitting surface of the light guide plate, the backlight module is provided with a through hole, the through hole penetrates through the light guide plate and the brightness enhancement film, the prism layer of the brightness enhancement film comprises a plurality of prism strips which are arranged in parallel, at least one prism strip comprises a first end surface facing the outer hole wall of the through hole, at least one first end surface and the plane where the light guide plate is positioned have a first included angle which is an acute angle, so that the prism strips on the first end surface do not have the light condensation function any more, light emitted by the light source assembly is reflected and scattered on the first end surface, the reflected light enters the side surface of the prism strip far away from the base material layer, the reflected light enters the side surface of the prism strip and then emits to one side of the light guide plate, the light condensation function of the prism strips on the first end surface is weakened, and the light emitting brightness of the first end surface is reduced, thereby improving the bright band at the outer hole wall of the through hole.
Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (12)
1. A backlight module is characterized by comprising a light guide plate, a brightness enhancement film and a light source assembly, wherein the light source assembly is positioned on at least one side of the light guide plate, a light emitting surface of the light source assembly faces to a light incident surface of the light guide plate, and the brightness enhancement film is positioned on one side of the light emitting surface of the light guide plate;
the backlight module comprises a through hole, the through hole penetrates through the light guide plate and the brightness enhancement film, and the hole wall of the through hole comprises an outer hole wall close to the light source component;
the membrane that adds lustre to includes substrate layer and prism layer, the prism level is in the substrate layer is kept away from one side of light guide plate, the prism layer includes a plurality of parallel arrangement's prism strip, at least one the prism strip is including the orientation the first terminal surface of outer pore wall, first terminal surface by the prism strip is close to one side oblique cutting formation of through-hole, first terminal surface orientation is kept away from one side of substrate layer, at least one first terminal surface with light guide plate place plane has first contained angle alpha, and wherein alpha is the acute angle.
2. The backlight module according to claim 1, wherein the first end surfaces of the prism bars facing the outer hole wall are all acute angles with respect to the plane of the light guide plate.
3. The backlight module according to claim 1, wherein the first end surface is a flat surface, or the first end surface is a curved surface curved toward the light exit surface of the light guide plate.
4. The backlight module according to claim 1, wherein the outer hole wall extends along a first direction, the outer hole wall comprises a middle region and edge regions, the edge regions are located at two sides of the middle region along the first direction, the outer hole wall comprises a middle point, a middle line passing through the middle point is perpendicular to the extending direction of the light source module, the middle point is located in the middle region, and the first included angle α gradually increases from the middle region to the edge regions.
5. A backlight module according to claim 1, wherein the first end face comprises a plurality of grooves and/or protrusions.
6. The backlight module as claimed in claim 1, wherein one side of the substrate layer close to the outer hole wall comprises a second end face, the second end face is integrally formed by cutting with the first end face, the second end face and the plane of the light guide plate have a second included angle, and the second included angle is equal to the first included angle.
7. The backlight module according to claim 1, wherein the brightness enhancement film comprises a first brightness enhancement film and a second brightness enhancement film, the second brightness enhancement film is located on a side of the first brightness enhancement film away from the light guide plate, the prism strip of the first brightness enhancement film is a first prism strip, the prism strip of the second brightness enhancement film is a second prism strip, and the first prism strip and/or the second prism strip has the first end surface.
8. A backlight module according to claim 7, wherein the first prism bars extend in a direction perpendicular to the direction in which the second prism bars extend.
9. The backlight module of claim 8, wherein the first prism strip has a first vertex angle away from the substrate layer, and the second prism strip has a second vertex angle away from the substrate layer, and the first vertex angle is equal to the second vertex angle.
10. A backlight module according to claim 1, characterized in that α is 30 ° ≦ 60 °.
11. The backlight module according to claim 1, wherein the light source module is only located on one side of the light guide plate, the hole wall of the through hole includes a rear hole wall facing away from the light source module, an end surface of the prism strip facing the rear hole wall is a third end surface, and an included angle between the third end surface and a plane where the light guide plate is located is a right angle.
12. A display device, comprising the backlight module of any one of claims 1 to 11, and a display panel disposed opposite to the backlight module, wherein the display panel is located on one side of a light-emitting surface of the backlight module.
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