CN113219731B - Backlight module and display device - Google Patents
Backlight module and display device Download PDFInfo
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- CN113219731B CN113219731B CN202110556866.0A CN202110556866A CN113219731B CN 113219731 B CN113219731 B CN 113219731B CN 202110556866 A CN202110556866 A CN 202110556866A CN 113219731 B CN113219731 B CN 113219731B
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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
- G02F1/133602—Direct backlight
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
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Abstract
The invention discloses a backlight module and a display device, belonging to the technical field of display, wherein the backlight module at least comprises a first light-emitting area and a second light-emitting area, one side of a brightness enhancement film of the backlight module, which faces the light-emitting surface of the backlight module, comprises a plurality of first prism strips and a plurality of second prism strips, the first prism strips are positioned in the first light-emitting area, and the second prism strips are positioned in the second light-emitting area; the included angle between the first surface of the first prism strip and the plane where the light-emitting surface of the backlight module is located is equal to the included angle between the second surface and the plane where the light-emitting surface of the backlight module is located; the third surface of the second prism strip is positioned on one side of the fourth surface, which is close to the first light emergent area; the included angle between the third surface and the plane where the light-emitting surface of the backlight module is located is larger than the included angle between the fourth surface and the plane where the light-emitting surface of the backlight module is located. The display device comprises the backlight module. The invention can realize different differentiated designs of different use areas and different visual angles, and meets the requirement of applying the backlight module to a large-screen vehicle-mounted display system.
Description
Technical Field
The invention relates to the technical field of display, in particular to a backlight module and a display device.
Background
The liquid crystal display is more and more commonly used in daily life, the main viewing angle of the conventional liquid crystal display device is parallel to the normal direction of the display device, but with the continuous progress of the display technology, the visual angle of the display is continuously improved, and the large viewing angle becomes the main development direction of the liquid crystal display. For example, wide-angle portable electronic devices such as notebook computers, personal digital assistants, tablet computers, and mobile phones all use large-angle technology, so that people can see complete and undistorted pictures when watching wide-angle displays from different directions. However, people also want to avoid the display content being viewed from all viewing angles in some application scenarios while enjoying the visual experience brought by the large viewing angle.
Such as some display devices in the passenger compartment of an on-board display system. At present, vehicle-mounted display is in a diversified development stage, special visual angle requirements required to be met are different, and when the vehicle-mounted display is driven normally, people who drive the vehicle are not expected to see information on the display device due to safety requirements, so that driving safety accidents caused by distraction of the attention of the drivers are prevented, and the display device for displaying and entertainment is generally arranged at a passenger seat in a cabin. However, more and more high-end customers want to have a large-screen design which is oversized, integrates Cluster (a vehicle instrument Cluster in front of a driving seat), CID (an information display configured at a center console part, and can have functions of multimedia playing such as CD and DVD, a reverse image and a GPS navigation system), and a front-drive entertainment display into a whole, so that too much display content on the large screen is easy to distract a driver at the driving seat in the large-screen vehicle-mounted display, and driving safety is affected.
Therefore, it is an urgent technical problem to provide a backlight module and a display device that can realize both ultra-large screen display and differential design of different use areas and different viewing angles of the same display screen.
Disclosure of Invention
In view of this, the invention provides a backlight module and a display device, so as to solve the problem that driving safety is affected due to the fact that a large-screen vehicle-mounted display in the prior art adopts a uniform visual angle design and has no regional visual angle function.
The invention discloses a backlight module which at least comprises a first light-emitting area and a second light-emitting area, wherein the first light-emitting area and the second light-emitting area are arranged along a first direction; the backlight module at least comprises a brightness enhancement film, one side of the brightness enhancement film, which faces a light-emitting surface of the backlight module, comprises a plurality of first prism strips and a plurality of second prism strips, the first prism strips are positioned in a first light-emitting area, and the second prism strips are positioned in a second light-emitting area; the first prism strip comprises a first surface and a second surface, and the included angle between the first surface and the plane where the light-emitting surface of the backlight module is located is equal to the included angle between the second surface and the plane where the light-emitting surface of the backlight module is located; the second prism strip comprises a third surface and a fourth surface; in the first direction, the third surface is positioned on one side of the fourth surface, which is close to the first light emergent area; the included angle between the third surface and the plane where the light-emitting surface of the backlight module is located is larger than the included angle between the fourth surface and the plane where the light-emitting surface of the backlight module is located.
Based on the same invention concept, the invention also discloses a display device which comprises a display panel and the backlight module which are oppositely arranged, 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 of the invention at least comprises a brightness enhancement film, one side of the brightness enhancement film facing to the light-emitting surface of the backlight module comprises a plurality of first prism strips and a plurality of second prism strips, the plurality of first prism strips are positioned in a first light-emitting area, the plurality of second prism strips are positioned in a second light-emitting area, the second prism strips in the range of the second light-emitting area are arranged to be in an asymmetric structure, an included angle formed by a third surface of the second prism strip close to one side of the first light-emitting area and the plane of the light-emitting surface of the backlight module is larger than an included angle formed by a fourth surface and the plane of the light-emitting surface of the backlight module, the total reflection phenomenon of light rays in the second prism strips can be destroyed by the second prism strips in the asymmetric structure, namely, different prism strip designs of subareas in the same backlight module are arranged, and the total reflection phenomenon of light rays in the second prism strips is destroyed by the second prism strips in the asymmetric structure in the second light-emitting area, the light rays entering the second prism strips are emergent from the fourth surface as much as possible, namely the light emergent brightness of the second prism strip area corresponding to the fourth surface is higher, so that the differential design of different use areas with different visual angles is realized, and the requirement that the backlight module provided by the invention can be applied to a large-screen vehicle-mounted display system is met.
Of course, it is not necessary for any product in which the present invention is practiced to specifically 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 an embodiment of the present invention;
FIG. 2 is a schematic sectional view taken along line A-A' of FIG. 1;
FIG. 3 is a close-up view of a brightness enhancement film in the area M1 of FIG. 2;
FIG. 4 is a close-up view of a brightness enhancement film in the area M2 of FIG. 2;
FIG. 5 is a schematic cross-sectional view taken along line B-B' of FIG. 1;
fig. 6 is a schematic view illustrating a light direction of a first prism strip of the backlight module in the first light emergent area of the backlight module according to the embodiment;
fig. 7 is a schematic view illustrating a light direction of a second prism strip of the backlight module in the second light emergent area of the backlight module according to the embodiment;
fig. 8 is a schematic diagram illustrating a comparison between a light direction of a first prism strip in a first light emitting area range and a light direction of a second prism strip in a second light emitting area range of the backlight module of the present embodiment;
FIG. 9 is a schematic view illustrating a light direction of the light of the backlight module in the first prism strip according to the present embodiment;
FIG. 10 is a schematic view illustrating a light direction of the light of the backlight module in the second prism strip according to the present embodiment;
fig. 11 is a comparison graph of the brightness simulation effect in which the included angle between the fourth surface of the second prism strip and the plane where the light emitting surface of the backlight module is located is different in the present embodiment;
FIG. 12 is an enlarged view of the brightness enhancement film in the M3 region of FIG. 1;
FIG. 13 is a schematic view of an alternative cross-sectional configuration taken along line A-A' of FIG. 1;
FIG. 14 is an enlarged fragmentary view of the area M4 in FIG. 13;
FIG. 15 is another enlarged fragmentary view of the area M4 of FIG. 13;
FIG. 16 is a schematic cross-sectional view of a display device according to an embodiment of the invention;
fig. 17 is a schematic structural diagram of a display device provided by an embodiment of the present invention.
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 to 4, fig. 1 is a schematic plan view of a backlight module according to an embodiment of the present invention, fig. 2 is a schematic sectional view taken along a direction a-a' in fig. 1, fig. 3 is a partial enlarged view of a brightness enhancement film in an area M1 in fig. 2, fig. 4 is a partial enlarged view of a brightness enhancement film in an area M2 in fig. 2, and the backlight module 000 according to the embodiment includes at least a first light exiting area LA1 and a second light exiting area LA2, wherein the first light exiting area LA1 and the second light exiting area LA2 are arranged along a first direction X;
the backlight module 000 at least comprises a brightness enhancement film 10, wherein one side of the brightness enhancement film 10 facing the light-emitting surface E of the backlight module 000 comprises a plurality of first prism strips 101 and a plurality of second prism strips 102, the first prism strips 101 are located in the first light-emitting area LA1, and the second prism strips 102 are located in the second light-emitting area LA 2;
as shown in fig. 3, the first prism strip 101 includes a first surface 101A and a second surface 101B, and an included angle α 1 between the first surface 101A and a plane where the light-emitting surface E of the backlight module 000 is equal to an included angle α 2 between the second surface 101B and a plane where the light-emitting surface E of the backlight module 000 is located;
as shown in fig. 4, second prism strip 102 includes third surface 102A and fourth surface 102B; in the first direction X, the third surface 102A is located on a side of the fourth surface 102B close to the first light exiting area LA 1; an included angle α 3 between the third surface 102A and the plane of the light-emitting surface E of the backlight module 000 is greater than an included angle α 4 between the fourth surface 102B and the plane of the light-emitting surface E of the backlight module 000.
Specifically, the backlight module 000 provided in this embodiment may be a large-sized display module, and may be applied to a backlight structure of a vehicle-mounted display system. As shown in fig. 1, the backlight module 000 at least includes a first light-emitting area LA1 and a second light-emitting area LA2 arranged along a first direction X, and optionally, the size of the backlight module 000 in the first direction X is larger than the size in a second direction Y, where the second direction Y intersects with or is perpendicular to the first direction X in a direction parallel to the light-emitting surface E of the backlight module 000, so that the requirement of a large screen design (it can be understood that the large screen in the present embodiment refers to a large size along the first direction X) in which Cluster (an automobile instrument Cluster in front of a driver seat), CID (an information display arranged at a center console portion), and a front passenger entertainment display are integrated in a vehicle display can be satisfied. Optionally, the first light exiting zone LA1 of this embodiment may be a Cluster region in a vehicle-mounted display, the first light exiting zone LA1 may also be a CID region in a vehicle-mounted display, or the first light exiting zone LA1 may also be a Cluster and CID region in a vehicle-mounted display. The second light exiting area LA2 of the present embodiment may be a passenger entertainment display area in the in-vehicle display.
It can be understood that fig. 1 and fig. 2 of the present embodiment only schematically illustrate the structure of the backlight module 000, and in particular, the backlight module 000 may be a side-in type backlight, which is beneficial to saving the power consumption of the light source of the large-sized backlight, and avoiding the power consumption increase due to the large size of the direct type backlight module and the large number of light sources to be disposed. Optionally, as shown in fig. 1, the backlight module 000 of this embodiment may include a lateral light source 20, where a plurality of light emitting diodes (which may also be cold cathode fluorescent tubes, fluorescent lamps, or other types of light sources) of the lateral light source 20 are arranged along the first direction X, and when the size of the first direction X of the backlight module 000 of this embodiment is greater than the size of the second direction Y, the plurality of light emitting diodes of the lateral light source 20 are arranged along the first direction X, which is beneficial to improving the uniformity of the light output brightness of the backlight module 000, and avoids a situation that the brightness loss is greater at one end far from the lateral light source 20 due to the larger size of the first direction X when the plurality of light emitting diodes of the lateral light source 20 are arranged along the second direction Y.
The backlight module 000 of the present embodiment at least includes a Brightness Enhancement Film 10 (BEF), optionally, as shown in fig. 2 and 5, fig. 5 is a schematic cross-sectional view along the direction B-B' in fig. 1, the backlight module 000 may further include a housing (not shown in the figure), a diffusion Film 30, a light guide plate 40, and a reflection Film 50 located on the side of the Brightness Enhancement Film 10 away from the light exit surface E of the backlight module 000, and further optionally, a reflection type Brightness Enhancement Film 60(DBEF) located on the side of the Brightness Enhancement Film 10 close to the light exit surface E of the backlight module 000, it is understood that fig. 2 and 5 only illustrate the positional relationship of the components in the backlight module, and do not show an actual structure, for example, dots may be disposed on the light guide plate 40, and the diffusion Film 30 may include diffusion particles; the reflective film 50 can reflect the light emitted from the side-entry light source 20 and emitted to the side of the backlight module 000 away from the light-emitting surface, so as to improve the utilization rate of the light; the light guide plate 40 can convert the light emitted by the lateral light source 20 into a surface light source, the diffusion film 30 can diffuse the non-uniform light into uniform light, the brightness enhancement film 10 can convert the light with a large angle into light with a small angle, the light can be collected and the brightness of the light can be improved, namely, the light emitted by the lateral light source 20 can be diffused through the light guide plate 40, most of the light is refracted to one side of the light guide plate 40 facing the light-emitting surface of the backlight module, a small part of the light passes through the reflection film 50 and is utilized at the same time, the light is scattered through the diffusion film 30, the light is relatively balanced in the whole plane, the light can be collected and enhanced through the brightness enhancement film 10, and the light-emitting surface E of the backlight module 000 can be understood as the surface of one side of the reflection type polarization brightness enhancement film 60 far away from the brightness enhancement film 10. The combination of the reflective polarization brightness enhancement film 60 and the brightness enhancement film 10 of the present embodiment can selectively reflect the light of the backlight module so that the light is not absorbed by the lower polarizer (not shown) disposed on the side of the light-emitting surface E of the backlight module 000, so that a portion of the light can be reused, thereby further improving the display brightness and the display effect of the display device using the backlight module 000.
In the backlight module 000 of the embodiment, a side of the brightness enhancement film 10 facing the light emitting surface E of the backlight module 000 includes a plurality of first prism bars 101 and a plurality of second prism bars 102, the plurality of first prism bars 101 are located in the first light exiting area LA1, and the plurality of second prism bars 102 are located in the second light exiting area LA 2.
As shown in fig. 3, the first prism strip 101 includes a first surface 101A and a second surface 101B, an included angle α 1 between the first surface 101A and a plane where the light-emitting surface E of the backlight module 000 is equal to an included angle α 2 between the second surface 101B and a plane where the light-emitting surface E of the backlight module 000 is located, that is, the first prism strip 101 in the first light-emitting area LA1 may be a symmetric structure, that is, the first surface 101A and the second surface 101B are symmetric to each other, and a symmetric axis may be shown by a dashed line K in fig. 3; as shown in fig. 6, fig. 6 is a schematic view of the light direction of the first prism bar of the backlight module in the first light emitting area, and the light L is schematically illustrated by taking the light L as an example after exiting from the diffusion film 30 and entering the first prism bar 101. As shown in fig. 6, the first prism bars 101 with a symmetrical structure can control a part of light rays incident to the first prism bars 101 to be totally reflected inside the first prism bars 101 (for example, when the light rays L illustrated in fig. 6 exit from the first prism bars 101 to the outside of the first prism bars 101, when an incident angle increases to a certain degree, the refracted angle is 90 °, the incident angle is referred to as a critical angle, and thus once the light rays of the incident angle are greater than the critical angle, there is no refraction outside the first prism bars 101, and the part of light rays all return to the inside of the first prism bars 101), and the rest of light rays exit from the first surface 101A and the second surface 101B (not illustrated in fig. 6).
As shown in fig. 4, second prism strip 102 includes third surface 102A and fourth surface 102B; in the first direction X, the third surface 102A is located on a side of the fourth surface 102B close to the first light exiting area LA 1; an included angle α 3 between the third surface 102A and the plane of the light-emitting surface E of the backlight module 000 is greater than an included angle α 4 between the fourth surface 102B and the plane of the light-emitting surface E of the backlight module 000, that is, the second prism bar 102 in the range of the second light-emitting area LA2 may be an asymmetric structure, and an included angle α 3 between the third surface 102A close to the first light-emitting area LA1 and the plane of the light-emitting surface E of the backlight module 000 is greater than an included angle α 4 between the fourth surface 102B and the plane of the light-emitting surface E of the backlight module 000, as shown in fig. 7, fig. 7 is a schematic diagram of the light direction of the second prism bar of the backlight module in the second light-emitting area range in this embodiment, and the light is incident on the second prism bar 102 after exiting from the diffusion film 30 for example. As shown in fig. 7, in the second prism bar 102 with the asymmetric structure, the light incident on the third surface 102A may be totally reflected and continuously transmitted inside the second prism bar 102, but since an included angle α 3 formed by the third surface 102A and a plane where the light emitting surface E of the backlight module 000 is larger than an included angle α 4 formed by the fourth surface 102B and a plane where the light emitting surface E of the backlight module 000 is located, the total reflection phenomenon of the light incident on the fourth surface 102B may be destroyed, so that the light incident on the fourth surface 102B may be refracted, that is, the light emitting brightness of the area of the second prism bar 102 corresponding to the fourth surface 102B is higher. Or, referring to fig. 8, fig. 8 is a schematic diagram illustrating a comparison between a light L1 of the first prism strips in the first light exiting region and a light L2 of the second prism strips in the second light exiting region of the backlight module of this embodiment.
As can be seen from fig. 6-8, in this embodiment, the second prism bar 102 in the range of the second light exiting area LA2 may have an asymmetric structure, and an included angle α 3 formed by the plane where the third surface 102A close to the first light exiting area LA1 and the light emitting surface E of the backlight module 000 are located is larger than an included angle α 4 formed by the plane where the fourth surface 102B and the light emitting surface E of the backlight module 000 are located, and the total reflection phenomenon of the light in the second prism bar 102 may be destroyed by the asymmetric structure of the second prism bar 102, so that the light entering the second prism bar 102 exits from the fourth surface 102B as much as possible, that is, the luminance of the area of the second prism bar 102 corresponding to the fourth surface 102B is higher, which may be understood as that the luminance of the viewing angle when viewing from the right side of the second light exiting area LA2 in fig. 1 (the side far from the first light exiting area LA1 in the first direction X) is better, so that the first light exiting area LA1 may be used as a Cluster area in the vehicle-mounted display, when the first light exiting zone LA1 is used as the CID region in the vehicle-mounted display, or the first light exiting zone LA1 is used as the Cluster and CID region in the vehicle-mounted display, and the second light exiting zone LA2 is used as the assistant driving entertainment display region in the vehicle-mounted display, since the brightness of the right side of the assistant driving entertainment display region is high, that is, the brightness of the side of the second light exiting zone LA2 away from the first light exiting zone LA1 is high in the first direction X, it is possible to prevent the driver in the Cluster region from seeing the content of the assistant driving entertainment display region (that is, the second light exiting zone LA2), so that the driver in the range of the first light exiting zone LA1 is not attracted by the brightness of the second light exiting zone LA2 as much as possible, and safety is further improved.
The brightness enhancement film 10 of the backlight module 000 designed in this embodiment, through the design of different prism strips in the same backlight module 000, that is, the second prism strip 102 with an asymmetric structure in the second light-emitting area LA2 can destroy the total reflection phenomenon of light in the second prism strip 102, so that the light entering the second prism strip 102 exits from the fourth surface 102B as much as possible, that is, the light-emitting brightness of the second prism strip 102 area corresponding to the fourth surface 102B is higher, thereby realizing the differentiated design of different use areas with different viewing angles, and meeting the requirement of applying the backlight module 000 of this embodiment to a large-screen vehicle-mounted display system.
Optionally, in the embodiment, the plurality of first prism strips 101 are adjacent to each other, and the plurality of second prism strips 102 are adjacent to each other, so that the boundaries of any two adjacent first prism strips 101 are bordered, the boundaries of any two adjacent second prism strips 102 are bordered, that is, the boundaries of two adjacent first prism strips 101 are in contact with each other, and the boundaries of two adjacent second prism strips 102 are in contact with each other, so that prism strips are uniformly distributed on the brightness enhancement film 10, thereby avoiding waste of space between adjacent prism strips, and further facilitating further improvement of brightness enhancement effect.
It should be noted that fig. 1 and fig. 2 of the present embodiment only exemplarily show the structure of the backlight module 000, and in the specific implementation, the structure of the backlight module 000 includes but is not limited thereto, which can be understood by referring to the structure of the backlight module in the related art specifically, and the details of the present embodiment are not repeated herein.
In some optional embodiments, please refer to fig. 1 to 8 and 9 in combination, fig. 9 is a schematic view of a light direction of the light of the backlight module in the present embodiment in the first prism bar, in the present embodiment, the first surface 101A of the first prism bar 101 intersects the second surface 101B, an included angle between the first surface 101A and a plane where the light-emitting surface E of the backlight module 000 is α 1, an included angle between the second surface 101B and a plane where the light-emitting surface E of the backlight module 000 is α 2, and α 1 ═ α 2 ═ 45 °.
In this embodiment, it is explained that the first surface 101A and the second surface 101B of the first prism strip 101 intersect with each other, that is, the first prism strip 101 is a triangular prism, the vertex angle formed by the intersection of the first surface 101A and the second surface 101B is 90 °, the first prism strip 101 can be an isosceles right-angle triangular prism, the included angle α 1 between the plane where the first surface 101A and the light-emitting surface E of the backlight module 000 are located and the included angle α 2 between the plane where the second surface 101B and the light-emitting surface E of the backlight module 000 are located are both 45 °, in this embodiment, the first prism strip 101 is an isosceles right-angle triangular prism with a vertex angle of 90 °, so that the light rays in all directions can be converged and converged, thereby achieving a better brightness enhancement effect, and at the convergence range of the emergent light rays passing through the first prism strip 101 can be controlled to be about 70 ° (the emergent light rays illustrated as the region N1 in fig. 9), that the viewing angle range of the first light emergent region LA1 can be a larger viewing angle range of about 70 °, the light-emitting effect of the first light-emitting area LA1 is favorably improved, the first prism strips 101 are arranged to be isosceles right triangular prisms with 90-degree vertex angles, about 50% of light incident to the first prism strips 101 can be reflected back to the first prism strips 101 due to total reflection to be reused (such as total reflection light rays indicated by an N2 area in fig. 9), and therefore the loss of the light rays can be reduced as much as possible, and the light utilization rate is favorably improved.
In some optional embodiments, please refer to fig. 1-8 and 10 in combination, fig. 10 is a schematic view illustrating a light direction of the light of the backlight module in the second prism bar in the present embodiment, a third surface 102A and a fourth surface 102B of the second prism bar 102 intersect, an included angle between the third surface 102A and a plane where the light emitting surface E of the backlight module 000 is located is α 3, an included angle between the fourth surface 102B and a plane where the light emitting surface E of the backlight module 000 is located is α 4, α 3 is 45 °, and α 4 is less than 45 °.
In this embodiment, it is explained that the third surface 102A and the fourth surface 102B of the second prism bar 102 intersect with each other, that is, the second prism bar 102 is a triangular prism, the angle between the third surface 102A and the plane where the light-emitting surface E of the backlight module 000 is α 3, the angle between the fourth surface 102B and the plane where the light-emitting surface E of the backlight module 000 is α 4, α 3 is 45 °, α 4 < 45 °, and the second prism bar 102 is configured as a triangular prism in this embodiment, so that the light beams in all directions can be converged, and while achieving the brightness enhancement effect, most of even all of the light incident on the fourth surface 102B (including the light beam directly incident on the fourth surface 102B and the light beam reflected from the third surface 102A to the fourth surface 102B as shown in fig. 10) can be made to enter the angle less than 45 °, and the incident angle is reduced (total reflection occurs only when the incident angle is greater than or equal to the critical angle), the total reflection condition on the fourth surface 102B is destroyed, most of even all of the light rays incident on the fourth surface 102B can be directly refracted out (as indicated by the N4 area in fig. 10), and total reflection does not occur, so that the light-exiting brightness of the second prism strip 102 area corresponding to the fourth surface 102B is higher, that is, the brightness of the viewing angle is better when the right side of the second light-exiting area LA2 in the drawing is viewed.
In some alternative embodiments, please continue to refer to fig. 1-10, in this embodiment, an included angle α 4 between the fourth surface 102B of the second prism strip 102 and a plane on which the light emitting surface E of the backlight module 000 is within a range of 15 ° ≦ α 4 ≦ 35 °.
The present embodiment further explains that an included angle α 4 between the fourth surface 102B of the second prism bar 102 and the plane of the light-emitting surface E of the backlight module 000 may be in a range of 15 ° to 35 °, so as to satisfy α 3 > α 4, and destroy the total reflection condition, so that the light-emitting brightness of the area of the second prism bar 102 corresponding to the fourth surface 102B is higher, and meanwhile, the central brightness of the second light-emitting area LA2 may be prevented from being excessively affected, that is, the included angle α 4 between the fourth surface 102B and the plane of the light-emitting surface E of the backlight module 000 cannot be set too small or too large, and when the included angle is smaller than 15 °, although the light-emitting brightness of the area of the second prism bar 102 corresponding to the fourth surface 102B is higher, that is, the brightness on the right side of the second light-emitting area LA2 in the drawing is higher, the central brightness of the second light-emitting area LA2 is excessively reduced, and the overall light-emitting effect of the second light-emitting area LA2 is affected; if the angle is larger than 35 °, the central brightness of the second light exiting region LA2 can be ensured, but α 4 is too close to 45 ° of α 3, and the brightness of the region of the second prism bar 102 corresponding to the fourth surface 102B cannot be ensured to be improved, that is, the brightness of the right side of the second light exiting region LA2 in the drawing cannot be improved well.
As shown in the table i below, the table i shows the simulation result of the brightness distribution when α 4 of the second prism bar 102 is different, and fig. 11 is a comparison graph of the simulation effect of the brightness when the included angle α 4 between the fourth surface 102B of the second prism bar 102 and the plane where the light-emitting surface E of the backlight module 000 is different.
Table one:
as can be seen from the luminance simulation graphs in the above table one and fig. 11 (e), if α 4 is set to 5 °, although the right-side luminance is improved more (increased by about 85% luminance), the center luminance is reduced by about 80%, and when α 4 is greater than 35 ° and is close to 45 °, the right-side luminance value is not effectively improved. Therefore, in this embodiment, the included angle α 4 between the fourth surface 102B of the second prism strip 102 and the plane where the light-emitting surface E of the backlight module 000 is set to be 15 ° to 35 °, which can satisfy α 3 > α 4, and destroy the total reflection condition, so that the light-emitting brightness of the area of the second prism strip 102 corresponding to the fourth surface 102B is higher, and meanwhile, the central brightness of the second light-emitting area LA2 can be prevented from being excessively affected, and the overall light-emitting effect of the second light-emitting area LA2 can be ensured.
In some alternative embodiments, please refer to fig. 1-10 and 12 in combination, fig. 12 is a schematic diagram illustrating an enlarged structure of the M3 area brightness enhancement film of fig. 1, in which in the present embodiment, the first prism strips 101 extend along a first direction X, and the plurality of first prism strips 101 are arranged along a second direction Y;
the second prism bars 102 extend along the second direction Y, and the plurality of second prism bars 102 are arranged along the first direction X; the first direction X and the second direction Y intersect in a direction parallel to the light emitting surface E of the backlight module 000.
The present embodiment further explains that the arrangement directions of the prism bars of the first light exiting area LA1 and the second light exiting area LA2 are different, specifically, the first prism bars 101 of the first light exiting area LA1 extend along the first direction X, the plurality of first prism bars 101 are arranged along the second direction Y, the second prism bars 102 of the second light exiting area LA2 extend along the second direction Y, the plurality of second prism bars 102 are arranged along the first direction X, and the first direction X and the second direction Y intersect with each other or are perpendicular to each other in a direction parallel to the light exiting surface E of the backlight module 000 (as shown in fig. 12). In the present embodiment, the arrangement directions of the prism bars of the first light exiting zone LA1 and the second light exiting zone LA2 are set to be different, and the first light exiting zone LA1 and the second light exiting zone LA2 are arranged along the first direction X, so that the third surface 102A of the second prism bar 102 of the second light exiting zone LA2 can be made to face the first light exiting zone LA1, and the brightness of the right side viewing angle of the second light exiting zone LA2 can be controlled to be brighter by adjusting the angle of the fourth surface 102B, when the second light exiting zone LA2 is used as the secondary driving entertainment display area in the vehicle display, the content of the secondary driving entertainment display area (i.e., the second light exiting zone LA2) can be prevented as much as possible from being seen by the driver in the Cluster area due to the higher brightness of the right side, that is the brightness of the side of the second light exiting zone LA2 away from the first light exiting zone LA1 in the first direction X, so that the brightness of the secondary driving person in the first light exiting zone LA1 is as little as possible to attract the brightness of the second light exiting zone LA2, thereby being beneficial to improving the safety. In addition, in the embodiment, the first prism strips 101 of the first light exiting area LA1 extend along the first direction X, and the plurality of first prism strips 101 are arranged along the second direction Y, so that all the prism strips on the whole brightness enhancement film 10 are matched with each other, and therefore, light rays in the first direction X can be converged and converged, and light rays in the second direction Y can be converged and converged, thereby achieving better purposes of light condensation and brightness enhancement.
In some optional embodiments, please refer to fig. 1-5 with continuing reference, the backlight module 000 of the present embodiment further includes a light source 20A and a diffusion film 30 located at a side of the brightness enhancement film 10 away from the light-emitting surface E of the backlight module 000, wherein the light source 20 and the diffusion film 30 are located at a side of the brightness enhancement film 10 away from the light-emitting surface E of the backlight module 000; the diffusion film 30 is located between the light source 20A and the brightness enhancement film 10 in a direction Z perpendicular to the light-emitting surface E of the backlight module 000.
Optionally, as shown in fig. 5, this embodiment further explains that in a direction Z perpendicular to the light-emitting surface E of the backlight module 000, the backlight module 000 further includes a light source 20A and a diffusion film 30 located on a side of the brightness enhancement film 10 away from the light-emitting surface E of the backlight module 000, the backlight module 000 may be a side-in backlight module, a plurality of light sources 20A may be arranged at intervals on a side of the brightness enhancement film 10 away from the light-emitting surface E of the backlight module 000 to form a side-in light source 20 of a strip structure, in the direction Z perpendicular to the light-emitting surface E of the backlight module 000, the light source 20 and the diffusion film 30 are both located on a side of the brightness enhancement film 10 away from the light-emitting surface E of the backlight module 000, the diffusion film 30 is located between the light source 20A and the brightness enhancement film 10, the backlight module 000 may further include a light guide plate 40 located on a side of the light source 20A, a light-entering surface 40A of the light guide plate 40 is opposite to the light source 20A, a light-emitting surface 40B of the light guide plate 40 faces the diffusion film 30, the light incident surface 40A of the light guide plate 40 intersects with the light emergent surface 40B of the light guide plate 40, a reflective film 50 is further disposed on a side of the light guide plate 40 away from the diffusion film 30, and the brightness enhancement film 10 further includes a reflective polarization brightness enhancement film 60 on a side close to the light emergent surface E of the backlight module 000, light emitted from the light source 20A is incident through the light incident surface 40A of the light guide plate 40, most of the light is refracted out of the light emergent surface 40B of the light guide plate 40, a small portion of the light is utilized after being reflected through the reflective film 50, and the light emitted from the light emergent surface 40B of the light guide plate 40 is scattered through the diffusion effect of the diffusion film 30, so that the light is relatively balanced in the whole plane, and then is concentrated and enhanced through the brightness enhancement film 10.
In some alternative embodiments, referring to fig. 1-12 and 13 in combination, fig. 13 is a schematic cross-sectional view taken along a direction a-a' in fig. 1, in which the diffusion film 30 provided in this embodiment at least includes a plurality of first diffusion particles 301 and a plurality of second diffusion particles 302, and the particle size of the second diffusion particles 302 is larger than that of the first diffusion particles 301; the first diffusion particles 301 are located at least in the first light emergent area LA1, and the second diffusion particles 302 are located in the second light emergent area LA 2.
The embodiment explains that the diffusion film 30 in the backlight module 000 may include diffusion particles with different particle sizes, optionally, the diffusion particles may be but are not limited to PMMA (Polymethyl methacrylate) microparticles, which are white powder particles formed by suspending and polymerizing MMA (methyl methacrylate) monomers, and the diffusion particles of PMMA microspheres are dispersed in the diffusion film 30, so that the diffusion film 30 can form micron-sized concave-convex surfaces, which can cause incident light to generate refraction, reflection and scattering phenomena, thereby forming a uniform surface light source to achieve an optical diffusion effect.
The diffusion film 30 of the present embodiment includes at least a plurality of first diffusion particles 301 and a plurality of second diffusion particles 302, wherein the particle size of the second diffusion particles 302 is larger than that of the first diffusion particles 301, the first diffusion particles 301 with a small particle size are located at least in the first light exit region LA1, the second diffusion particles 302 with a large particle size are located in the second light exit region LA2, the diffusion film 30 in the second light exit region LA2 is configured to include the second diffusion particles 302 with a large particle size, and the diffusion particles with a large particle size exhibit a small-angle light exit (large particles exhibit a convex lens effect) light-converging effect, so that the viewing angle in the second light exit region LA2 is concentrated at a small angle, and the effect is poor at a large viewing angle, so that when the second light exit region LA2 is used as a rider entertainment display region in vehicle-mounted display, the viewing angle of the rider (viewing angle range of the large viewing angle) in the first light exit region LA1 is prevented from seeing the light of the second light exit region LA2 as little as possible, thereby being beneficial to improving the safety. And the diffusion film 30 in the range of the first light-exiting area LA1 is still set to have a structure including the first diffusion particles 301 with small particle size, so that light can still be emitted in a large angle in the first light-exiting area LA1, and the viewing angle is excellent, and when the first light-exiting area LA1 is used as a Cluster area in vehicle-mounted display, or the first light-exiting area LA1 is used as a CID area in vehicle-mounted display, or the first light-exiting area LA1 is used as a Cluster and CID area in vehicle-mounted display, the requirement of the large angle of viewing is met.
Alternatively, as shown in fig. 14, fig. 14 is a partial enlarged view of an area M4 in fig. 13, the diffusion film 30 may include a scratch-resistant layer 30A, a high-temperature-resistant polyester film 30B (pet), and a diffusion layer 303, the scratch-resistant layer 30A plays a role in protection, the high-temperature-resistant polyester film 30B is used for carrying diffusion particles, and the diffusion layer 30C includes a plurality of diffusion particles with different particle sizes. In the process of manufacturing the diffusion film 30, the diffusion layer 30C including the diffusion particles may be formed by mixing the resin and the diffusion particles and coating on the PET film substrate. The light emitted from the light guide plate 40 enters from the scratch-resistant layer 30A at the lowest part of the diffusion film 30, then penetrates through the high-transparent high-temperature-resistant polyester film 30B (PET film substrate), and is scattered by the diffusion particles of PMMA microspheres dispersed in the diffusion layer 30C to form a uniform surface light source. The diffusion particles can be spherical, the second diffusion particles 302 of the PMMA microspheres with large particle size function like a convex lens, and light is focused into a certain exit angle when passing through the second diffusion particles 302, thereby achieving the function of converging the luminance of the emergent light. And the light rays are emitted in a large angle without the position of the diffusion particles. In addition, the diffusion layer 30C of the present embodiment is provided with the first diffusion particles 301 with small particle sizes, so that the light in the first light exit area LA1 is prevented from being directly emitted from the diffusion film 30, and the atomization effect is achieved.
Alternatively, as shown in fig. 15, fig. 15 is another partial enlarged view of an M4 region in fig. 13, in this embodiment, the diffusion film 30 of the second light exiting region LA2 further includes a plurality of first diffusion particles 301; in the diffusion film 30 of the second light exit area LA2, the volume fraction of the plurality of second diffusion particles 302 is larger than the volume fraction of the plurality of first diffusion particles 301.
This embodiment further explains that the diffusion film 30 of the second light exiting area LA2 may include not only the second diffusion particles 302 with large particle size but also a plurality of first diffusion particles 301 with small particle size, so that the diffusion layer 30C in the range of the second light exiting area LA2 may include the first diffusion particles 301 and the second diffusion particles 302 with different particle sizes, and it is ensured that the light in the second light exiting area LA2 is not directly emitted from the diffusion film 30, thereby achieving the atomization effect. In addition, in the diffusion film 30 provided in the second light exiting region LA2, the volume fraction of the plurality of second diffusion particles 302 is greater than the volume fraction of the plurality of first diffusion particles 301, and the light of the second light exiting region LA2 is controlled to be emitted at a small angle, so that when the second light exiting region LA2 is used as a passenger-ride entertainment display region in vehicle-mounted display, the viewing angle of the passenger-ride entertainment display region is small, and the safety is improved.
It should be noted that fig. 13-15 of the present embodiment only illustrate the structure of the diffusion film 30, and in implementation, the shape and number of diffusion particles in the diffusion film 30 are not limited to the illustrated shape and number, and the diffusion film 30 may be arranged according to actual requirements, and the present embodiment is not limited in particular.
In some alternative embodiments, please refer to fig. 16 and 17 in combination, where fig. 16 is a schematic cross-sectional structure of a display device according to an embodiment of the present invention, fig. 17 is a schematic structural diagram of a display device according to an embodiment of the present invention, and the display device 111 according to this embodiment includes the backlight module 000 according to the above embodiment of the present invention. Optionally, the display device 111 includes a display panel 100 and the backlight module 000 in the foregoing embodiment, the display panel 100 is located on one side of the light-emitting surface of the backlight module 000, optionally, as shown in fig. 17, the display device 111 in this embodiment may be applied to the field of vehicle-mounted display, the display device 111 in an automobile at least includes a large-size total display area AA integrating a Cluster701 (a vehicle instrument Cluster in front of a driving seat), a CID702 (an information display configured at a center console part and having functions of multimedia playing such as CD, DVD, etc., a back image, and a GPS navigation system), and a secondary driving entertainment display 703, and a first display area AA1 of the display area AA corresponds to the Cluster area, a second display area AA2 corresponds to the CID area, and a third display area AA3 corresponds to the secondary driving entertainment display area. It can be understood that the display device 111 and the vehicle-mounted display system using the display device 111 provided in the embodiment of the present invention have the beneficial effects of the backlight module 000 provided in the embodiment of the present invention, and specific descriptions of the backlight module 000 in the foregoing embodiments may be specifically referred to, and are not repeated herein.
By the embodiment, the backlight module and the display device at least realize the following beneficial effects:
the backlight module of the invention at least comprises a brightness enhancement film, one side of the brightness enhancement film facing to the light-emitting surface of the backlight module comprises a plurality of first prism strips and a plurality of second prism strips, the plurality of first prism strips are positioned in a first light-emitting area, the plurality of second prism strips are positioned in a second light-emitting area, the second prism strips in the range of the second light-emitting area are arranged to be in an asymmetric structure, an included angle formed by a third surface of the second prism strip close to one side of the first light-emitting area and the plane of the light-emitting surface of the backlight module is larger than an included angle formed by a fourth surface and the plane of the light-emitting surface of the backlight module, the total reflection phenomenon of light rays in the second prism strips can be destroyed by the second prism strips in the asymmetric structure, namely, different prism strip designs of subareas in the same backlight module are arranged, and the total reflection phenomenon of light rays in the second prism strips is destroyed by the second prism strips in the asymmetric structure in the second light-emitting area, the light rays entering the second prism strips are emitted from the fourth surface as much as possible, namely, the light emitting brightness of the second prism strip area corresponding to the fourth surface is higher, so that the differential design of different use areas with different visual angles is realized, and the requirement that the backlight module provided by the invention can be applied to a large-screen vehicle-mounted display system is met.
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 (8)
1. A backlight module is characterized by at least comprising a first light-emitting area and a second light-emitting area, wherein the first light-emitting area and the second light-emitting area are arranged along a first direction;
the backlight module at least comprises a brightness enhancement film, one side of the brightness enhancement film, facing a light-emitting surface of the backlight module, comprises a plurality of first prism strips and a plurality of second prism strips, the first prism strips are located in the first light-emitting area, and the second prism strips are located in the second light-emitting area;
the first prism strip comprises a first surface and a second surface, and the included angle between the first surface and the plane where the light-emitting surface of the backlight module is located is equal to the included angle between the second surface and the plane where the light-emitting surface of the backlight module is located;
the second prism strip includes a third surface and a fourth surface; wherein, in the first direction, the third surface is located on one side of the fourth surface close to the first light emergent area; the included angle between the third surface and the plane where the light-emitting surface of the backlight module is located is larger than the included angle between the fourth surface and the plane where the light-emitting surface of the backlight module is located;
the backlight module also comprises a light source and a diffusion film which are positioned on one side of the brightness enhancement film, which is far away from the light-emitting surface of the backlight module, and the light source and the diffusion film are positioned on one side of the brightness enhancement film, which is far away from the light-emitting surface of the backlight module; in the direction vertical to the light-emitting surface of the backlight module, the diffusion film is positioned between the light source and the brightness enhancement film;
the diffusion film comprises at least a plurality of first diffusion particles and a plurality of second diffusion particles, and the particle size of the second diffusion particles is larger than that of the first diffusion particles;
the first diffusion particles are at least positioned in the first light emergent region, and the second diffusion particles are positioned in the second light emergent region;
the diffusion film of the second light exit region further includes a plurality of the first diffusion particles;
in the diffusion film in the second light exit region, a volume fraction of the plurality of second diffusion particles is larger than a volume fraction of the plurality of first diffusion particles.
2. The backlight module as claimed in claim 1, wherein the first surface intersects the second surface, an included angle between the first surface and a plane where the light emitting surface of the backlight module is located is α 1, an included angle between the second surface and a plane where the light emitting surface of the backlight module is located is α 2, and α 1 ═ α 2 ═ 45 °.
3. The backlight module according to claim 2, wherein the third surface intersects the fourth surface, an included angle between the third surface and a plane where the light emitting surface of the backlight module is located is α 3, an included angle between the fourth surface and a plane where the light emitting surface of the backlight module is located is α 4, α 3 is 45 °, and α 4 is less than 45 °.
4. A backlight module according to claim 3, characterized in that α 4 is 15 ° ≦ α 4 ≦ 35 °.
5. The backlight module according to claim 1,
the first prism strips extend along the first direction, and the first prism strips are arranged along the second direction;
the second prism strips extend along the second direction, and the second prism strips are arranged along the first direction; the first direction and the second direction are intersected in a direction parallel to a light-emitting surface of the backlight module.
6. The backlight module as claimed in claim 5, wherein the first direction and the second direction are perpendicular to each other in a direction parallel to a light emitting surface of the backlight module.
7. A backlight module according to claim 1, wherein a plurality of the first prism bars are adjacent to each other, and a plurality of the second prism bars are adjacent to each other.
8. A display device, comprising a display panel and the backlight module as claimed in any one of claims 1 to 7, wherein the display panel is disposed on a side of a light-emitting surface of the backlight module.
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| CN102620212A (en) * | 2012-04-10 | 2012-08-01 | 深圳市华星光电技术有限公司 | Backlight module and liquid crystal display device |
| CN210954396U (en) * | 2019-12-18 | 2020-07-07 | 京东方科技集团股份有限公司 | Backlight module and display device |
| CN111580308A (en) * | 2020-07-03 | 2020-08-25 | 上海天马微电子有限公司 | Backlight module and display device |
| CN112485859A (en) * | 2020-12-28 | 2021-03-12 | 厦门天马微电子有限公司 | Backlight module and display device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109212660B (en) * | 2018-10-26 | 2020-01-24 | 合肥京东方光电科技有限公司 | Light guide assembly, light collimation assembly, backlight module and display device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102620212A (en) * | 2012-04-10 | 2012-08-01 | 深圳市华星光电技术有限公司 | Backlight module and liquid crystal display device |
| WO2013152498A1 (en) * | 2012-04-10 | 2013-10-17 | 深圳市华星光电技术有限公司 | Backlight module and liquid crystal display device |
| CN210954396U (en) * | 2019-12-18 | 2020-07-07 | 京东方科技集团股份有限公司 | Backlight module and display device |
| CN111580308A (en) * | 2020-07-03 | 2020-08-25 | 上海天马微电子有限公司 | Backlight module and display device |
| CN112485859A (en) * | 2020-12-28 | 2021-03-12 | 厦门天马微电子有限公司 | Backlight module and display device |
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