CN115755467A - Backlight module and display device - Google Patents
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- CN115755467A CN115755467A CN202211484434.4A CN202211484434A CN115755467A CN 115755467 A CN115755467 A CN 115755467A CN 202211484434 A CN202211484434 A CN 202211484434A CN 115755467 A CN115755467 A CN 115755467A
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Abstract
The invention belongs to the technical field of display, and relates to a backlight module and a display device. The backlight module comprises a backlight source and a backlight film layer, wherein a light through hole penetrating through the backlight film layer is formed in the light emitting direction of the backlight film layer, and a reflection structure matched with the light through hole is further arranged at the light through hole; the reflecting structure comprises an annular cylinder, a first port and a second port, wherein the first port and the second port are positioned at two ends of the annular cylinder; the second port is positioned on the light-emitting side of the backlight film layer, and the area of the second port is smaller than that of the first port; the inner side wall surface of the annular cylinder body is a total reflection surface; the backlight module also comprises a light supplementing light source arranged at the first port; at least part of emergent light of the light supplementing light source is reflected by the side wall surface in the annular cylinder body and then is emergent from the second port. The design of the reflection structure at the backlight module enables the emergent light of the light supplementing light source to be collected to a certain extent, thereby being beneficial to eliminating a black area appearing in a central area above the photosensitive element and improving the display quality.
Description
Technical Field
The invention relates to the technical field of display, in particular to a backlight module and a display device.
Background
The demand of ultra-large screen displays is increasing, liquid Crystal Displays (LCD) are limited by self independent backlight, and can not realize a full screen in a real sense all the time, and currently, the under-screen camera displays in the market are mainly Organic Light Emitting Displays (OLEDs), and the LCD displays with under-screen cameras are few but tend in the future.
At present, when an LCD display with a screen lower camera displays, a black area can appear above the camera, and the light eye of a light supplement lamp is obvious.
Disclosure of Invention
In view of this, the present invention provides a backlight module and a display device, which aims to reduce and eliminate a black region above a photosensitive element, thereby facilitating to improve the overall display quality of a product.
The technical solution of the invention is as follows:
a backlight module comprises a backlight source and a backlight film layer, wherein a light through hole penetrating through the backlight film layer is formed in the light emitting direction of the backlight film layer, and a reflection structure matched with the light through hole is further arranged at the light through hole;
the reflecting structure comprises an annular cylinder, a first port and a second port, wherein the first port and the second port are positioned at two ends of the annular cylinder; the first port and the second port are arranged along the light-emitting direction of the backlight film layer, wherein the second port is positioned on the light-emitting side of the backlight film layer, and the area of the second port is smaller than that of the first port;
the inner side wall surface of the annular cylinder body is a total reflection surface;
the backlight module also comprises a light supplementing light source arranged at the first port;
at least part of emergent light of the light supplementing light source is reflected by the side wall surface in the annular cylinder and then is emergent from the second port.
The invention also provides a display device which comprises the backlight module and a display panel positioned at the light-emitting side of the backlight module.
Compared with the related art, the display panel and the display device provided by the invention at least realize the following beneficial effects:
1. the backlight module is provided with a light through hole penetrating through the backlight film layer along the light emitting direction of the backlight film layer, and the light through hole is provided with a reflecting structure and a light supplementing light source. The reflecting structure comprises an annular cylinder, a first port and a second port, wherein the first port and the second port are positioned at two ends of the annular cylinder; through this kind of structural design, the inside wall of reflection configuration has carried out certain degree to the emergent light of light filling light source and has collected for the emergent light reinforcing of second port department, thereby help eliminating the black area that photosensitive element top central area appears.
2. According to the invention, while the black area is reduced by the reflection structure, the outer side wall surface of the reflection structure is skillfully utilized and is set as a total reflection surface; the outer side wall surface of the reflecting structure is set to be a total reflection surface, so that light guided by the backlight film layer can be prevented from entering a photosensitive area during photographing; meanwhile, because the area of the first port of the reflecting structure is smaller than that of the second port, the outer wall surface of the reflecting structure has a certain inclination angle relative to the light-emitting direction of the light backlight source, so that light rays irradiated to the outer wall surface of the reflecting structure can be reflected more uniformly, the brightness difference between the transition region and the normal display region and the central region can be reduced, and the display quality is improved.
3. According to the invention, through the matching design of the reflection structure and the supplementary light source, the reflection structure can form physical covering on the supplementary light source, so that a lamp shadow of the supplementary light source cannot appear on a screen during normal display, and the display effect is improved.
Of course, it is not necessary for any product in which the 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 diagram illustrating a display state of a conventional LCD display device;
FIG. 2 is a schematic structural diagram of a backlight module according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a side-in type backlight module according to an embodiment of the invention;
FIG. 4 is a diagram illustrating a structure of a fill-in light source according to an embodiment of the invention;
FIG. 5 is a schematic diagram of another embodiment of a fill-in light source according to the present invention;
FIG. 6 is a sectional view of a display screen of a mobile phone according to an embodiment of the present invention;
FIG. 7 is a top view of a reflective structure 12 according to an embodiment of the present invention;
FIG. 8 is a top view of another reflective structure 12 according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a display device according to an embodiment of the 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 will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents. It should be noted that the embodiments provided in the embodiments of the present invention can be combined with each other without contradiction.
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.
The backlight module comprises a backlight source and a backlight film layer, wherein a light through hole penetrating through the backlight film layer is formed in the light emitting direction of the backlight film layer, and a reflection structure matched with the light through hole is further arranged at the light through hole; the reflecting structure comprises an annular cylinder, a first port and a second port, wherein the first port and the second port are positioned at two ends of the annular cylinder; the first port and the second port are arranged along the light emergent direction of the backlight film layer, wherein the second port is positioned on the light emergent side of the backlight film layer, and the area of the second port is smaller than that of the first port; the inner side wall surface of the annular cylinder body is a total reflection surface; the backlight module also comprises a light supplementing light source arranged at the first port; at least part of emergent light of the light supplementing light source is reflected by the side wall surface in the annular cylinder body and then is emergent from the second port.
The backlight module is provided with a light through hole penetrating through the backlight film layer along the light emitting direction of the backlight film layer, and the light through hole is provided with a reflecting structure and a light supplementing light source. The reflecting structure comprises an annular cylinder, a first port and a second port, wherein the first port and the second port are positioned at two ends of the annular cylinder; through this kind of structural design, the inside wall of reflection configuration carries out certain degree to collect to the emergent light of light filling light source for the emergent light reinforcing of second port department, thereby help eliminating the black area that photosensitive element top central region appears.
The above is the core idea of the present invention, and the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without any creative effort belong to the protection scope of the embodiments of the present invention.
FIG. 1 is a diagram illustrating a display state of a conventional LCD display device; referring to fig. 1, the LCD display device shown in fig. 1 includes a normal display area AA and a photosensitive area A1; wherein, the backlight module of the photosensitive area A1 is provided with a hole area for placing a photosensitive element, and the hole area is provided with an annular supplementary light source; in normal display, a light source is supplemented to the photosensitive area A1; however, since the hole area where the photosensitive element is disposed in the prior art does not collect the light emitted from the fill-in light source, the central area a12 of the photosensitive area A1 presents an obvious black area compared to the normal display area AA despite the presence of the fill-in light source.
Therefore, the present invention provides a solution, and fig. 2 is a schematic structural diagram of a backlight module according to the present invention.
Referring to fig. 2, the backlight module 1 of the present invention includes a backlight source and a backlight film 11, wherein a light through hole penetrating through the backlight film 11 is formed along a light emitting direction of the backlight film 11, and a reflection structure 12 adapted to the light through hole is further disposed at the light through hole; the reflection structure 12 includes an annular cylinder 121, and a first port 122 and a second port 123 located at two ends of the annular cylinder 121; the first port 122 and the second port 123 are opened along the light-emitting direction of the backlight film 11, wherein the second port 123 is located at the light-emitting side of the backlight film 11, and the area of the second port 123 is smaller than that of the first port 122; the inner side wall surface of the annular cylinder 121 is a total reflection surface; the backlight module 1 further includes a light supplement light source 13 disposed at the first port 122; at least part of emergent light of the light supplement light source 13 is reflected by the inner side wall surface of the annular cylinder 121 and then is emitted from the second port 123.
Referring to fig. 2, in the backlight module 1 of the present invention, the reflective structure 12 penetrating through the backlight film 11 is disposed at the light through hole, the reflective structure 12 includes an annular cylinder 121 and a first port 122 and a second port 123 located at two ends of the annular cylinder 121, the first port 122 and the second port 123 are disposed along the light emitting direction of the backlight film 11, and the area of the second port 123 is smaller than the area of the first port 122, so that the light emitted from the light supplementing light source 13 is collected to a certain extent under the action of the reflective structure 12, the light intensity at the second port 123 is increased, and the black area is reduced or eliminated.
Compared with the related art, the related art also has a light through hole penetrating through the backlight film layer 11, and a light supplement light source may be arranged at the light through hole; however, in the prior art, the light-passing hole is usually a cylindrical hole, and the light-passing hole only serves as an optical channel of the light-supplementing light source and the photosensitive element and has no convergence effect on light; in order to avoid light leakage of the optical film layer at the light through hole, an iron frame vertical wall and sealing glue are arranged at the light through hole; according to the backlight module 1, the reflecting structure 12 penetrating through the backlight film layer 11 is arranged at the light through hole, on one hand, the reflecting structure 12 can prevent light of the optical film layer at the light through hole from leaking into the light through hole, and on the other hand, light of the light supplementing light source can be collected to a certain degree, so that the effect of eliminating or lightening a display black area is achieved.
The backlight module 1 of the present invention can be applied to both the side-in type backlight mode and the direct type backlight mode.
FIG. 3 is a schematic structural diagram of a side-entry backlight module; in the side-in type backlight mode, the backlight light source is disposed at one side of the backlight film layer 11; the outer side wall surface of the annular cylinder 121 is a total reflection surface; part of emergent light of the backlight source irradiates to the outer side wall surface of the annular cylinder 12 through the backlight film layer 11, and is emitted along the light emergent direction of the backlight film layer 11 after being reflected by the outer side wall surface of the annular cylinder 121.
Referring to fig. 1 and fig. 3, fig. 1 is a schematic diagram illustrating a display state of a conventional display device, when a screen is lighted, the display screen presents multiple hues, the hue of a photosensitive area A1 is different from the hue of a normal display area AA, the photosensitive area A1 includes a central area a12 and a transition area a11 located between the normal display area AA and the central area a12, the central area a12 is an area with the weakest brightness in the entire display screen, and is easy to present a black area; the brightness of the transition area a11 is between the normal display area AA and the central area a 12; in addition, the transition area a11 also shows a lamp shadow a13 of the fill-in light source.
In view of this, in the invention, while the black region is reduced by the reflection structure 12, the outer wall surface of the reflection structure 12 is skillfully utilized, and the outer wall surface of the reflection structure 12 is set as a total reflection surface; the outer side wall surface of the reflecting structure 12 is set as a total reflection surface, so that on one hand, light guided by the backlight film layer 11 can be prevented from entering the light sensing area A1 during photographing; meanwhile, since the area of the first port 122 of the reflection structure 12 of the present invention is smaller than the area of the second port 123, the outer wall surface of the reflection structure 12 has a certain inclination angle with respect to the light emitting direction of the light backlight source, so that the light irradiated to the outer wall surface of the reflection structure 12 can be reflected more uniformly, which is helpful for reducing the brightness difference between the transition area a11 and the normal display area AA as well as the central area a12, and improving the display quality. As shown in fig. 3, when the outer sidewall of the reflective structure 12 is a total reflection surface and is disposed obliquely, the light C, D, E, F, G, H emitted from the backlight source is reflected by the reflective structure 12 and is emitted uniformly.
In some embodiments, the outer and/or inner sidewall surfaces of annular cylinder 121 are inclined at an angle of 15-65 degrees relative to the plane of first port 122.
Specifically, by defining the inclination of the outer wall surface of the annular cylinder 121 with respect to the first port 122, the light uniformizing effect of the reflective structure 12 is facilitated to be exerted, so that the luminance difference between the transition area a11 and the normal display area AA and the central area a12 is facilitated to be reduced, and the display quality is improved.
Furthermore, the inclination of the inner side wall surface of the annular cylinder 121 relative to the first port 122 is limited, so that the convergence effect of the emergent light of the light supplementing light source 13 on the inner side wall surface of the annular cylinder 121 is adjusted, the adjustment of the brightness of the central area a12 is facilitated, the brightness difference between the central area a12 and the transition area a11 and the normal display area AA is weakened as a whole, and the display quality is improved.
Fig. 4 is a structural view of the fill-in light source 13, and fig. 5 is another structural view of the fill-in light source 13. Referring to fig. 3, 4 and 5, the supplementary lighting source 13 includes a lamp panel 131 and a plurality of LED light emitting elements 132, the lamp panel 131 is disposed at the first port 122, and the lamp panel 131 is provided with a second light passing hole 1311 opposite to the second port 123; the plurality of LED light emitting elements 132 are disposed around the second light passing hole 1311.
With continuing reference to fig. 3, fig. 4 and fig. 5, the light supplement light source 13 is configured such that the plurality of LED light emitting elements 132 are disposed around the second light passing hole 1311, and the second light passing hole 1311 is opposite to the second port 123; thus, the emergent light of the plurality of LED light emitting elements 132 is more uniform through the light emitted from the second port 123 after being reflected by the inner side wall surface of the reflective structure 12, which is beneficial to improving the display effect of the screen.
Referring to fig. 1 and fig. 2, as shown in fig. 1, in the related art, a hole region for placing a photosensitive element is formed at a backlight module in a photosensitive region A1, an annular light supplement light source is disposed in the hole region, and the light supplement light source is a plurality of LED light emitting elements arranged in an annular manner; the problems with this structure are: during normal display, a plurality of lamp shadows of the LED light emitting elements appear on the screen.
In order to eliminate the lamp shadow appearing on the screen during normal display, the projection of the annular cylinder 121 covers the projection of the LED light emitting element 132 in the supplemental light source 13 in the direction from the second port 123 to the first port 122.
Specifically, the reflection structure 12 and the supplemental light source 13 are designed in a matching manner, so that the reflection structure 12 can physically cover the supplemental light source 13, and therefore, when the display is normally performed, a lamp shadow of the supplemental light source 13 cannot appear on the screen, and the display effect is improved.
Further, in some embodiments, in order to further improve the brightness of the central area a12 and make the emergent light of the fill-in light source 13 more uniform, the structure of the fill-in light source 13 is designed.
With continuing reference to fig. 4 and 5, the lamp panel 13 of the present invention is provided with a first mounting area 1312 and a second mounting area 1313 around the second light passing hole 1311, the second mounting area 1313 is located outside the first mounting area 1312, and the plurality of LED light emitting elements 132 are disposed in the first mounting area 1311 and the second mounting area 132.
In the related art, the light supplement light source 13 is usually arranged in a single layer, and the plurality of LED light emitting elements are distributed in the first mounting region 1312 and the second mounting region 1313 to form a double-layer LED arrangement, so that compared with the single-layer LED arrangement, the double-layer LED arrangement makes light at the second port 123 more uniform, enhances the emergent light intensity of the second port 123, and is beneficial to improving the brightness and uniformity of the central region a 12.
With continued reference to fig. 4, in some embodiments, the second light passing hole 1311 is circular, the first mounting area 1312 is circular, the center of the first mounting area 1312 is concentric with the center of the second light passing hole 1311, the LED light emitting elements 132 in the first mounting area are uniformly arranged along the circumferential direction of the first mounting area 1312, and each LED light emitting element 132 is disposed along the radial direction of the second light passing hole 1311.
According to the invention, the second light through hole 1311 is circular, the first mounting area 1312 is circular, and the center of the first mounting area 1312 is concentric with that of the second light through hole 1311, so that the LED light-emitting elements 132 in the first mounting area 1312 can emit light around the second light through hole 1311, and the brightness of the central area can be improved; in addition, the LED light emitting elements 132 in the first mounting region are uniformly arranged along the circumferential direction of the first mounting region 1312, and each LED light emitting element 132 is arranged along the radial direction of the second light passing hole 1311; by adopting the arrangement manner, the LED light emitting elements 132 can be more arranged in the limited space of the first mounting region 1312, so that the brightness of the central region a12 is further enhanced, and the black region is reduced.
With continued reference to fig. 4, further, the second mounting area 1313 of the present invention is circular ring, and the center of the second mounting area 1313 is concentric with the center of the second light passing hole 1311; the LED light emitting elements 132 in the second mounting region 1313 are uniformly arranged in the circumferential direction of the second mounting region 1313; each LED light emitting element 132 in the second mounting region 1313 is disposed in a radial direction of the second light passing hole 1311, and is located between two adjacent LED light emitting elements 132 in the first mounting region 1312.
The second mounting region 1313 is configured to fit the first mounting region 1312, wherein the basic arrangement of the LED lighting elements 132 in the second mounting region 1313 is similar to the arrangement of the LED lighting elements 132 in the first mounting region 1312, but the LED lighting elements 132 in the second mounting region 1313 are located between two adjacent LED lighting elements 132 in the first mounting region 1312, and the configuration is such that the number of LED lighting elements 132 in the second mounting region is the same as the number of LED lighting elements 132 in the first mounting region; the effect produced by this structure makes the emergent light at the second port 123 more uniform on one hand; meanwhile, the adjustment of the LED light-emitting elements 132 on the inner layer and the outer layer is easier, the adjustment parameters of the inner ring and the outer ring can be set to be the same, and the uniformity is better controlled.
Referring to fig. 5, in some embodiments, the second light passing hole 1311 is circular, the first mounting region 1312 is concentric with the second light passing hole 1311, and an angle of the first mounting region 1312 around the second light passing hole 1311 is greater than 180 degrees and smaller than 360 degrees; the LED light emitting elements 132 in the first mounting region 1312 are uniformly arranged along the circumferential direction of the first mounting region 1312, and each LED light emitting element is arranged along the radial direction of the second light through hole.
With continued reference to fig. 5, in some embodiments, the second mounting region 1312 is concentric with the second light passing hole 1311, and the second mounting region 1313 surrounds the second light passing hole 1311 by an angle greater than 180 degrees and less than 360 degrees. The LED light emitting elements 132 in the second mounting region 1313 are uniformly arranged along the circumferential direction of the second mounting region 1313; each LED light emitting element 132 in the second mounting region 1313 is disposed in a radial direction of the second light passing hole 1311, and is located between two adjacent LED light emitting elements 132 in the first mounting region 1312.
Specifically, the structure of the fill-in light source 13 shown in fig. 5 is substantially the same as the structure of the fill-in light source shown in fig. 4, except that the angles of the first mounting region 1312 and the second mounting region 1313 around the second light passing hole 1311 are not circumferential angles. Taking a mobile phone with a camera under a screen as an example, the light supplement light source with the structure is mainly used for reducing the width of a black area above a camera shooting area when the mobile phone takes a picture.
Fig. 6 is a sectional view of a display screen of a mobile phone during photographing, as shown in fig. 6, the display screen includes a black area 51, a display area 52 and an operation area 53 during photographing, and the display area 52 is located between the black area 51 and the operation area 53. The non-circumferential arrangement of the fill light sources shown in fig. 5 is mainly to reduce the width of the black region 51.
Fig. 7 shows a top view of one reflective structure 12, and fig. 8 shows a top view of another reflective structure 12. The reflection structure 12 shown in fig. 7 is applied to the fill-in light source 13 shown in fig. 4, and the reflection structure 12 shown in fig. 8 is applied to the fill-in light source 13 shown in fig. 5.
Based on the same inventive concept, the present invention further provides a display device, and fig. 9 is a schematic structural diagram of a display device according to an embodiment of the present invention, where the display device includes the backlight module 1 and the display panel 2 located on the light emitting side of the backlight module.
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 mobile phone, a tablet, a computer, a television, and a vehicle-mounted display device, and the present invention is not limited thereto. The display device provided by the embodiment of the present invention has the beneficial effects of the backlight module provided by the embodiment of the present invention, and specific reference may be made to the specific description of the display panel in each embodiment above, and details of this embodiment are not repeated herein.
With continued reference to fig. 9, the display device of the present invention further includes a photosensitive element 3 disposed opposite to the second port 123. The light sensing element 3 may be a camera, a fingerprint recognition device, or the like.
At the demonstration stage, light filling light source 13 among the backlight unit is luminous, and light filling light source 13's emergent light obtains collecting to a certain extent under reflection configuration 12's effect, has promoted the light intensity of second port 123 department to be favorable to reducing the display brightness difference of display device in conventional display area and the display area that leads to the unthreaded hole corresponds, the black district phenomenon of the display area that leads to the unthreaded hole correspondence is eliminated even in the weakening, is favorable to promoting display device's whole display brightness homogeneity.
At the sensitization stage, light filling light source 13 among the backlight unit closes to avoid light that light filling light source 13 sent to cause the interference to display device's sensitization process, thereby be favorable to promoting display device's sensitization accuracy.
As shown in fig. 9, the display device of the present invention further includes a light uniformizing structure 21, and the light uniformizing structure 21 is disposed on a side of the second port 123 facing the display panel 2 and opposite to the second port 123.
Specifically, the light uniformizing structure 21 is arranged above the second port 123, and the emergent light of the second port 123 becomes a more uniform surface light source after passing through the light uniformizing structure 21, which is helpful for improving the display uniformity and improving the display quality.
Continuing to refer to fig. 9, taking a display device with an under-screen camera as an example to further explain the present invention, the size of the second port 123 is consistent with the opening of the panel camera area, when taking a picture, the normal display area AA is still turned on, and light guided by the backlight film layer in the AA area is reflected upward by the outer side wall surface of the reflection structure 12, so as to avoid entering the camera when taking a picture; the light emitted by the plurality of LED light emitting elements 132 in the cavity is reflected by the inner sidewall surface of the reflecting structure 12 and then emitted upwards, and then diffused by the light uniformizing structure 21 to form a uniform surface light source; in addition, the light emitted by the LED light emitting element 132 in the reflection structure is reflected by the inner sidewall surface of the reflection structure 12 and then emitted downward, reflected/scattered by the camera head, and then emitted upward, and diffused by the light uniformizing structure 21, thereby forming a uniform surface light source.
Further, the light homogenizing structure 21 of the present invention can be a polymer network liquid crystal cell or a polymer dispersion liquid crystal cell or a transflective optical film.
In summary, the backlight module and the display device provided by the invention at least achieve the following beneficial effects:
the backlight module 1 of the present invention is provided with a light through hole penetrating through the backlight film 11 along the light emitting direction of the backlight film 11, and a reflective structure 12 and a light supplement light source 13 are disposed at the light through hole. The reflection structure 12 includes an annular cylinder 121, and a first port 122 and a second port 123 located at two ends of the annular cylinder, wherein the area of the second port 123 is smaller than that of the first port 122, and meanwhile, the inner side wall surface of the reflection structure is set as a total reflection surface; through the structural design, the emergent light of the light supplementing light source 13 is collected to a certain degree by the inner side wall surface of the reflection structure 12, so that the emergent light at the second port 123 is enhanced, and the elimination of a black area appearing in a central area A12 above the photosensitive element is facilitated; in addition, when the black area is reduced by the reflection structure 12, the outer side wall surface of the reflection structure 12 is skillfully utilized, and the outer side wall surface of the reflection structure 12 is set as a total reflection surface; the outer side wall surface of the reflecting structure 12 is set as a total reflection surface, so that on one hand, light guided by the backlight film layer 11 can be prevented from entering the light sensing area A1 during photographing; meanwhile, because the area of the first port 122 of the reflection structure 12 of the present invention is smaller than the area of the second port 123, the outer wall surface of the reflection structure 12 has a certain inclination angle with respect to the light emitting direction of the light backlight source, so that the light irradiated to the outer wall surface of the reflection structure 12 can be reflected more uniformly, thereby being helpful to reduce the brightness difference between the transition area a11 and the normal display area AA as well as the central area a12, and improving the display quality. In addition, the reflecting structure 12 and the supplementary light source 13 are designed in a matching way, so that the reflecting structure 12 can physically cover the supplementary light source 13, and therefore, when the display is normally performed, the lamp shadow of the supplementary light source 13 cannot appear on the screen, and the display effect is improved.
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 (13)
1. A backlight module is characterized by comprising a backlight source and a backlight film layer, wherein a light through hole penetrating through the backlight film layer is formed in the light emitting direction of the backlight film layer, and a reflection structure matched with the light through hole is further arranged at the light through hole;
the reflecting structure comprises an annular cylinder, a first port and a second port, wherein the first port and the second port are positioned at two ends of the annular cylinder; the first port and the second port are arranged along the light-emitting direction of the backlight film layer, wherein the second port is positioned on the light-emitting side of the backlight film layer, and the area of the second port is smaller than that of the first port;
the inner side wall surface of the annular cylinder body is a total reflection surface;
the backlight module also comprises a light supplementing light source arranged at the first port;
at least part of emergent light of the light supplementing light source is reflected by the side wall surface in the annular cylinder and then is emergent from the second port.
2. The backlight module as claimed in claim 1, wherein the backlight source is disposed at one side of the backlight film layer; the total reflection surface of the outer side wall surface of the annular cylinder body;
and part of emergent light of the backlight light source irradiates the outer side wall surface of the annular cylinder through the backlight film layer, and is emitted along the light emitting direction of the backlight film layer after being reflected by the outer side wall surface of the annular cylinder.
3. The backlight module according to claim 2, wherein the inclination of the outer sidewall surface and/or the inner sidewall surface of the annular cylinder with respect to the plane of the first port is 15-65 °.
4. The backlight module according to claim 1, 2 or 3, wherein the supplementary lighting source comprises a lamp panel and a plurality of LED light-emitting elements, the lamp panel is arranged at the first port, and the lamp panel is provided with a second light-through hole opposite to the second port; the plurality of LED light-emitting elements are arranged around the second light through hole;
and the projection of the annular cylinder covers the projection of the LED light-emitting element in the supplementary light source along the direction from the second port to the first port.
5. The backlight module according to claim 4, wherein the lamp panel is provided with a first mounting area and a second mounting area around the second light passing hole, the second mounting area is located outside the first mounting area, and the plurality of LED light-emitting elements are arranged in the first mounting area and the second mounting area.
6. The backlight module as claimed in claim 5, wherein the second light passing hole is circular, the first mounting region is circular, the center of the first mounting region is concentric with the center of the second light passing hole, the LED light emitting elements in the first mounting region are uniformly arranged along the circumference of the first mounting region, and each LED light emitting element is arranged along the radial direction of the second light passing hole.
7. The backlight module as claimed in claim 6, wherein the second mounting region is circular and has a center concentric with the center of the second light passing hole;
the LED light-emitting elements in the second mounting region are uniformly distributed along the circumferential direction of the second mounting region; each LED light-emitting element in the second mounting area is arranged along the radial direction of the second light through hole and is positioned between two adjacent LED light-emitting elements in the first mounting area.
8. The backlight module according to claim 5, wherein the second light passing hole is circular, the first mounting region is concentric with the second light passing hole, and the angle of the first mounting region around the second light passing hole is greater than 180 degrees and less than 360 degrees; the LED light-emitting elements in the first mounting area are uniformly distributed along the circumferential direction of the first mounting area, and each LED light-emitting element is arranged along the radial direction of the second light through hole.
9. The backlight module according to claim 8, wherein the second mounting area is concentric with the second light passing hole, and the angle of the second mounting area surrounding the second light passing hole is greater than 180 degrees and less than 360 degrees;
the LED light-emitting elements in the second mounting region are uniformly distributed along the circumferential direction of the second mounting region; each LED light-emitting element in the second mounting area is arranged along the radial direction of the second light through hole and is positioned between two adjacent LED light-emitting elements in the first mounting area.
10. A display device, comprising the backlight module of any one of claims 1-9 and a display panel located at the light exit side of the backlight module.
11. The display device according to claim 10, further comprising a photosensitive element disposed opposite the second port.
12. The display device according to any one of claims 10 to 11, further comprising a light unifying structure disposed on a side of the second port facing the display panel and facing the second port.
13. The display device according to claim 12, wherein the light homogenizing structure is a polymer network liquid crystal cell or a polymer dispersed liquid crystal cell or a transflective optical film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211484434.4A CN115755467A (en) | 2022-11-24 | 2022-11-24 | Backlight module and display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211484434.4A CN115755467A (en) | 2022-11-24 | 2022-11-24 | Backlight module and display device |
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| Publication Number | Publication Date |
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| CN115755467A true CN115755467A (en) | 2023-03-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202211484434.4A Pending CN115755467A (en) | 2022-11-24 | 2022-11-24 | Backlight module and display device |
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