Backlight module and display device
By setting a light-collecting structure on the light-emitting surface of the light guide plate, the problem of obvious halo in a single zone of the side-lit backlight module is solved, achieving a more uniform light distribution and better display effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- BOE TECHNOLOGY GROUP CO LTD
- Filing Date
- 2025-04-18
- Publication Date
- 2026-04-28
AI Technical Summary
The side-lit backlight module suffers from noticeable halo effect in a single zone, resulting in poor display quality.
A light-collecting structure is set on the light-emitting surface of the light guide plate. By designing the gap between the light-collecting structure and the adjacent light group, the light is blocked from being emitted into the adjacent light-emitting zone, thus improving the halo problem.
It effectively improves the halo effect, enhances the uniformity of brightness and light distribution, and improves the display effect.
Smart Images
Figure CN224176849U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of display technology, and in particular to a backlight module and a display device. Background Technology
[0002] In recent years, local-dimming of Mini LEDs has become a hot research topic in the industry. In Mini LED product design, a direct-lit design densely arranges blue chips or blue LEDs on a printed circuit board (PCB) / glass substrate to achieve local dimming in a smaller area. However, due to its high cost, customer demand is limited. To reduce costs, multi-zone edge-lit backlight modules can be used, but these modules suffer from noticeable halo effects in individual zones. Utility Model Content
[0003] This invention provides a backlight module and a display device to improve the problem of significant halo effect in single-zone backlight modules.
[0004] This utility model embodiment provides a backlight module, including: a light guide plate, the light guide plate having a light emitting surface and two side surfaces connected to and opposite to the light emitting surface; the backlight module has an optical film material disposed on the light emitting surface of the light guide plate, and a side light source disposed on at least one of the two side surfaces; the side light source includes: a plurality of lamp groups arranged along a first direction; the extending direction of the connecting edge between the side surface and the light emitting surface is the same as the first direction;
[0005] The light guide plate has at least one light-collecting structure on one side of the light-emitting surface. The light-collecting structure extends from one side to the other side, and at least part of the end of the light-collecting structure is opposite to the gap between adjacent lamp groups, so that the light-collecting structure and the lamp groups form a light-emitting zone. The light-collecting structure is configured to gather the light emitted by the lamp groups in the light-emitting zone to the adjacent light-emitting zones.
[0006] In one possible implementation, the light guide plate includes: a light guide plate body; the light receiving structure is a protrusion formed by the light guide plate body toward the optical film material, and the cross-sectional width of the protrusion gradually decreases in the direction perpendicular to the extension direction in the direction from the light guide plate body toward the optical film material.
[0007] In one possible implementation, the surface of the light guide plate body facing the optical film and the raised surface also have a plurality of first dots;
[0008] The light guide plate has a first axis extending along the first direction and passing through the center of the light-emitting zone; the density of the first dots gradually increases in the direction from the side towards the first axis.
[0009] In one possible implementation, the lamp assembly includes: a plurality of light-emitting elements arranged along the first direction; and in the direction from the light guide plate body toward the optical film, the maximum height of the protrusion is greater than the maximum height of the light-emitting elements.
[0010] In one possible implementation, the cross-sectional shape of the protrusion perpendicular to the extension direction includes: a triangle, a trapezoid, or a semi-ellipse.
[0011] In one possible implementation, the light-collecting structure is a groove recessed from the surface of the light guide plate toward the optical film material and toward the side away from the optical film material, and the cross-sectional width of the groove gradually decreases in the direction perpendicular to the extending direction in the direction from the optical film material toward the light guide plate.
[0012] In one possible implementation, the light guide plate further includes a backlight surface opposite to the light-emitting surface; the light guide plate has a set of recessed strips on the backlight surface that are recessed toward the light-emitting surface; the orthographic projection of the set of recessed strips on the light-emitting surface overlaps with the groove.
[0013] The recessed strip group includes: a plurality of sub-recessed strips arranged along the first direction and extending perpendicular to the first direction; in the same recessed strip group, in the direction along the first direction and from the edge region to the middle region, the height of the sub-recessed strips gradually increases in the direction perpendicular to the light-emitting surface.
[0014] In one possible implementation, the sub-recessed strip is also filled with white oil.
[0015] In one possible implementation, the backlight surface also has a plurality of second dots;
[0016] The light guide plate has a first axis extending along the first direction and passing through the center of the light-emitting zone; the density of the second dots gradually increases in the direction from the side towards the first axis.
[0017] In one possible implementation, the width of the recessed strip group in the first direction is the same as the width of the groove in the first direction; and the groove and the sub-recessed strip are spaced apart in a direction perpendicular to the light-emitting surface.
[0018] In one possible implementation, the light-collecting structure satisfies the following relationship:
[0019] A2≤A1<2A3+A2; where A1 represents the maximum width of the light-collecting structure in the first direction, A2 represents the maximum width of the gap between adjacent lamp groups in the first direction, and A3 represents the maximum width of the element in the first direction.
[0020] In one possible implementation, the optical film material includes: a diffusion film, a first prism located on the side of the diffusion film opposite to the light guide plate, and a second prism located on the side of the first prism opposite to the light guide plate.
[0021] In one possible implementation, the backlight module further includes a color conversion film located between the optical film and the light guide plate.
[0022] In one possible implementation, the material of the light guide plate includes polycarbonate; the light guide plate is reused as a back plate.
[0023] This utility model embodiment also provides a display device, including the backlight module provided in this utility model embodiment.
[0024] The beneficial effects of this utility model embodiment are as follows: In this utility model embodiment, by providing at least one light-collecting structure on one side of the light-emitting surface of the light guide plate, and the end of the light-collecting structure is opposite to the gap between the adjacent lamp group, that is, the light-collecting structure is made on the light-emitting surface of the light guide plate and located at the boundary of the light-emitting zone F, the light emitted by the lamp group in the light-emitting zone to the adjacent light-emitting zone can be collected. In other words, by designing the light-collecting structure to block the light emitted by the lit light-emitting zone from the adjacent light-emitting zone, the halo problem can be improved. Attached Figure Description
[0025] Figure 1 One of the side views of the display device provided in the embodiment of this utility model;
[0026] Figure 2 One of the top views of the light guide plate and side light source provided in the embodiment of this utility model;
[0027] Figure 3 A second top view of the light guide plate and side light source provided in an embodiment of this utility model;
[0028] Figure 4 One of the cross-sectional schematic diagrams of the protrusion provided in the embodiment of this utility model;
[0029] Figure 5 A second schematic cross-sectional view of the protrusion provided for an embodiment of this utility model;
[0030] Figure 6 A second side view of the display device provided in an embodiment of this utility model;
[0031] Figure 7 The third top view of the light guide plate and side light source provided in the embodiment of this utility model;
[0032] Figure 8 One of the cross-sectional schematic diagrams of the concave strip provided in the embodiment of this utility model;
[0033] Figure 9 A second schematic cross-sectional view of the concave strip provided in an embodiment of this utility model;
[0034] Figure 10 To form Figure 1 The diagram shows the flow chart of the light guide plate.
[0035] Figure 11 To form Figure 6 The diagram shows the flow chart of the light guide plate. Detailed Implementation
[0036] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.
[0037] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as “comprising” or “including” mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as “connected” or “linked” are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as “upper,” “lower,” “left,” and “right” are used only to indicate relative positional relationships, and these relative positional relationships may change accordingly when the absolute position of the described objects changes.
[0038] As used herein, “approximately” or “substantially the same” includes the stated value and means within an acceptable range of deviations from the specific value, as determined by a person skilled in the art taking into account the measurement in question and the errors associated with the measurement of the specific quantity (i.e., limitations of the measurement system). For example, “substantially the same” may mean a difference relative to the stated value within one or more standard deviations, or within ±30%, 20%, 10%, or 5%.
[0039] In the accompanying drawings, the thicknesses of layers, films, panels, regions, etc., are enlarged for clarity. Exemplary embodiments are described herein with reference to cross-sectional views that are schematic diagrams of idealized embodiments. Thus, deviations from the shapes shown in the drawings will be expected as a result of, for example, manufacturing techniques and / or tolerances. Therefore, the embodiments described herein should not be construed as limited to the specific shapes of the regions shown herein, but rather include deviations in shape caused, for example, by manufacturing processes. For example, regions illustrated or described as flat may typically have rough and / or non-linear characteristics. Furthermore, sharp corners illustrated may be rounded. Thus, the regions shown in the figures are schematic in nature, and their shapes are not intended to illustrate the precise shapes of the regions, nor are they intended to limit the scope of the claims.
[0040] To keep the following description of the embodiments of this disclosure clear and concise, detailed descriptions of known functions and known components are omitted.
[0041] See Figure 1 , Figure 2 As shown, this embodiment of the present invention provides a backlight module, including: a light guide plate 11, the light guide plate 11 having a light emitting surface S1, and two side surfaces S2 connected to and disposed opposite to the light emitting surface S1; the backlight module has an optical film 12 disposed on the light emitting surface of the light guide plate 11, and a side light source 13 disposed on at least one of the two side surfaces S2; optionally, for example, combined with Figure 2 As shown, side light sources 13 can be provided on both sides S2; the side light sources 13 include: a plurality of lamp groups 130 arranged along the first direction X; the lamp groups 130 include: a plurality of light-emitting elements 1300 arranged along the first direction X; the extension direction of the connecting edge between the side S2 and the light-emitting surface S1 is the same as the first direction X; for example, combined with Figure 2 As shown, the connecting edge between the side surface S2 and the light-emitting surface S1 is the upper or lower edge of the light guide plate 11. The first direction X is the same as the extension direction of the upper or lower edge of the light guide plate 11. That is, multiple lamp groups 130 are arranged sequentially along the upper and / or lower edge of the light guide plate 11.
[0042] The light guide plate 11 has at least one light-collecting structure V on one side of the light-emitting surface S1. The light-collecting structure V extends from one side S2 to the other side S2, for example, by... Figure 2The upper side S2 of the light guide plate 11 extends downward to the lower side S2, and at least part of the end of the light-collecting structure 11 is opposite to the gap between the adjacent lamp group 130, so that the light-collecting structure V and the lamp group 130 form a light-emitting zone F. The light-collecting structure V is configured to gather the light emitted by the lamp group 130 in its own light-emitting zone F toward the adjacent light-emitting zone F, for example, combined with Figure 2 As shown, the lamp group 130 and the light-collecting structure V together form 6 light-emitting zones F. The second light-collecting structure V from the left can collect the light emitted by the lamp group 130 (that is, the two lamp groups on the far left with a total of 6 light-emitting elements 1300) in the first light-emitting zone F from the left to the second light-emitting zone F from the left.
[0043] In related technologies, when light is incident on a light guide plate, a line light source is converted into a surface light source because total internal reflection and diffuse reflection occur during transmission. Total internal reflection utilizes the light energy incident on the light guide plate as efficiently as possible, while diffuse reflection disperses the line light source into a surface light source. In side-lit multi-zone backlight modules, when the light group of a single light-emitting zone (e.g., 6 LEDs) is turned on, total internal reflection occurs inside the light guide plate, causing the light to diffuse into adjacent light-emitting zones (e.g., ...). Figure 2 The light emitted from the dot matrix of the light-emitting zones (left and right) produces a noticeable halo effect. In this embodiment of the invention, at least one light-receiving structure V is provided on one side of the light-emitting surface S1 of the light guide plate 11. The end of the light-receiving structure V is opposite to the gap between the adjacent lamp group 130. That is, the light-receiving structure V is made on the light-emitting surface S1 of the light guide plate 11 and located at the boundary of the light-emitting zone F. This can concentrate the light emitted by the lamp group 130 in the light-emitting zone F to the adjacent light-emitting zone F. In other words, by designing the light-receiving structure V to block the light emitted from the lit light-emitting zone from emitting to the adjacent light-emitting zone, the halo problem can be improved.
[0044] Combination Figure 2 As shown, for the area inside the light guide plate 11, a light-collecting structure V can be provided at a position corresponding to the gap between two adjacent lamp groups 130. For the edge area of the light guide plate 11, a light-collecting structure V can also be provided at the area corresponding to the outermost edge of the lamp group 130. For example, for Figure 2 As shown, light-collecting structures V can also be set in the leftmost and rightmost regions of the light guide plate 11.
[0045] In one possible implementation, combined with Figure 1 , Figure 2As shown, the light guide plate 11 includes: a light guide plate body 110; and a light-collecting structure V, which is a protrusion V1 formed by the light guide plate body 110 toward the optical film material. In the direction from the light guide plate body 110 toward the optical film material 12, the cross-sectional width b of the protrusion V1 gradually decreases in the direction perpendicular to the extension direction. In this embodiment of the invention, by using the protrusion V formed by the light guide plate body 110 toward the optical film material as the light-collecting structure V, and by making the cross-sectional width b of the protrusion V1 gradually decrease in the direction perpendicular to the extension direction, a light-collecting effect similar to a triangular prism is formed, thereby improving the halo problem.
[0046] Optionally, the light guide plate body 110 and the protrusion V1 can be integrally formed. The protrusion V1 can be formed by thinning a conventional light guide plate. Without affecting the display image, the light guide plate provided in this embodiment can replace the back plate in a conventional backlight module.
[0047] In one possible implementation, combined with Figure 2 As shown, the side light source 13 can be disposed on the light guide plate 11. Specifically, for example, the light guide plate 11 can be provided with a step around the side S2, and the side light source 13 can be located at the step. For example, the part of the light guide plate body 110 around the side S2 can serve as a step, and the side light source 13 can be located around the side S2 of the light guide plate 110. In another possible embodiment, combined with Figure 3 As shown, the side light source 13 can also be independently located in an area other than the light guide plate 11, for example, fixed to a circuit board, and may be spaced apart from the light guide plate 11.
[0048] In one possible implementation, combined with Figure 1 and Figure 2 As shown, the surface of the light guide plate body 110 facing the optical film 12 and the surface of the protrusion V1 also have a plurality of first dots 15; the light guide plate 11 has a first axis k1, which extends along a first direction X and passes through the center O of the light-emitting partition F; in the direction from the side S1 to the first axis k1 (e.g. Figure 1 As indicated by arrow c), the density of the first dot 15 gradually increases. In this embodiment of the invention, the surface of the light guide plate body 110 facing the optical film 12 and the surface of the protrusion V1 also have multiple first dots 15, which can disperse the line light source emitted by the lamp group 130 through the first dots 15 to form a surface light source, thereby improving the problem of poor uniformity of the line light source, which affects the display of the image, and, for example, the problem of uneven blue light intensity distribution emitted by the lamp group 13 within a single light-emitting zone F, which leads to severe color deviation after the color conversion material is excited; moreover, in the direction from the side S2 to the first axis k1 (e.g. Figure 2 As shown by the middle arrow c), the density of the first dot 15 gradually increases, which can improve the problem of poor brightness uniformity caused by the light intensity being weaker the farther away from the light-emitting element 1300.
[0049] In this embodiment of the present invention, when the light emitted from the lamp group 130 in the single light-emitting zone F is emitted to the light-receiving structure V, the light originally emitted in all directions is reflected and collected in the single light-emitting zone F. Then, after the line light source is dispersed into a surface light source by the first dot 15 in the single light-emitting zone F, it is emitted onto the optical film 12 on the light-emitting surface S1 side, and finally forms a display pattern on the display panel.
[0050] In one possible implementation, the first dot 15 can be a raised particle formed on the surface of the light guide plate 11, or it can be a pit formed on the surface of the light guide plate 11. It can be integrally formed by using a firing pin made in the light guide plate mold or by precision etching.
[0051] In one possible implementation, combined with Figure 1 As shown, in the direction from the light guide plate body 110 toward the optical film 12, the maximum height d1 of the protrusion V1 is greater than the maximum height d2 of the light-emitting element 1300.
[0052] In one possible implementation, combined with Figure 1 , Figure 2 As shown, in the direction from the light guide plate body 110 toward the optical film 12, that is, in the direction perpendicular to the light emitting surface S1, the maximum height d1 of the protrusion V1 can range from 0.2 mm to 0.8 mm, for example, from 0.3 mm to 0.7 mm, for example, from 0.4 mm to 0.6 mm, for example, from 0.5 mm, 0.5 mm, or 0.6 mm; the maximum width A1 of the protrusion V1 in the first direction X can range from 0.3 mm to 0.6 mm, for example, from 0.4 mm to 0.5 mm, for example, from 0.45 mm to 0.5 mm, for example, from 0.45 mm to 0.5 mm, for example, from 0.45 mm, 0.46 mm, 0.47 mm, 0.48 mm, 0.49 mm, or 0.5 mm.
[0053] In one possible implementation, combined with Figure 1 , Figure 2 As shown, in the direction perpendicular to the light-emitting surface S1, the thickness d3 of the light guide plate body 110 can be the same as the maximum height d1 of the protrusion V1. The height of the protrusion V1 needs to be controlled within the range of minus the total thickness of the light guide plate in order to maximize the utilization of light energy.
[0054] In one possible implementation, the cross-sectional shape of the protrusion V1 perpendicular to the extension direction can be triangular, for example, as shown in the figure. Figure 1 As shown; for example, the cross-sectional shape of the protrusion V1 perpendicular to the extension direction can be trapezoidal, such as... Figure 4As shown; for example, the cross-sectional shape of the protrusion V1 perpendicular to the extension direction can be semi-elliptical, such as... Figure 5 As shown.
[0055] In one possible implementation, for Figure 1 As shown, when a protrusion V1 is formed on the light-emitting surface S1 of the light guide plate 11 to serve as the light-receiving structure V, the following can be used: Figure 10 The process shown forms the light guide plate 11. That is, the light guide plate mold and dot design can be carried out first, then the light guide plate can be injection molded, and then the light guide plate gate can be cut and polished to complete the light guide plate manufacturing.
[0056] In one possible implementation, combined with Figure 6 , Figure 7 As shown, the light-collecting structure V is a groove V2 that is recessed from the surface of the light guide plate 11 toward the optical film 12 and away from the optical film 12. Furthermore, in the direction from the optical film 12 toward the light guide plate 11, the cross-sectional width of the groove V2 gradually decreases perpendicular to the extending direction. In this embodiment of the invention, by using a groove V2 with a hollowed-out shape at the boundary of the light-emitting zone F on the light-emitting surface S1 of the light guide plate 11 as the light-collecting structure V (when light from inside the light guide plate 11 reaches the groove V2, the light density decreases to the light sparseness, the emitted light angle increases, and a single-zone light-collecting effect occurs), the halo problem is improved.
[0057] In one possible implementation, combined with Figure 1 , Figure 2 As shown, in the direction perpendicular to the light-emitting surface S1, the maximum depth of the groove V2 can be 0.1 mm to 0.3 mm, for example, 0.1 mm, 0.2 mm, or 0.3 mm; the maximum width of the groove V2 in the first direction X can be 0.2 mm to 0.5 mm, for example, 0.2 mm, 0.3 mm, 0.4 mm, or 0.5 mm.
[0058] In one possible implementation, combined with Figure 6 As shown, the light guide plate 11 also includes a backlight surface S2 opposite to the light-emitting surface S1; the light guide plate 11 has a set of recessed strips V3 recessed towards the light-emitting surface S1 on the backlight surface S3; the orthographic projection of the set of recessed strips V3 on the light-emitting surface S3 overlaps with the groove V2; the set of recessed strips V3 includes: a plurality of sub-recessed strips V30 arranged along the first direction X and extending perpendicular to the first direction X, the extension length of the sub-recessed strips V30 can be the same as the extension length of the groove V2; in the same set of recessed strips V3, in the direction along the first direction X and from the edge region to the middle region, the height of the sub-recessed strips V30 in the direction perpendicular to the light-emitting surface gradually increases, for example, combined with Figure 6As shown, for the fourth recessed strip group V3 from the left, the height e1 of the sub-recessed strip V30 located at the outermost edge is less than the height e3 of the sub-recessed strip V30 located in the middle area. The sub-recessed strip V30 is also filled with white oil 14.
[0059] In this embodiment of the invention, the light guide plate 11 is further provided with a recessed strip group V3 on one side of the backlight surface S3 at the boundary of the light-emitting zone F. The recessed strip group V3 includes a plurality of sub-recessed strips V30. In the same recessed strip group V3, in the direction along the first direction X and from the edge area to the middle area, the height of the sub-recessed strip V30 gradually increases in the direction perpendicular to the light-emitting surface. The sub-recessed strip V30 is also filled with white oil 14. In this way, when the light from inside the light guide plate 11 is emitted from the backlight surface S3 through the sub-recessed strip V30, it can be reflected by the white oil with high reflectivity. On the one hand, it can prevent the light from inside the light guide plate 11 in the area where the single light-emitting zone F is located from being emitted from the backlight surface S3 to the adjacent light-emitting zone F. On the other hand, it can effectively improve the brightness of the single light-emitting zone F and improve the contrast. Moreover, the height-gradient sub-recessed strip V30 can prevent bright lines from appearing due to large brightness changes and improve the uniformity of the display screen.
[0060] In one possible implementation, see Figure 6 , Figure 7 As shown, the backlight surface S3 also has a plurality of second dots 16; the light guide plate 11 has a first axis k1, which extends along a first direction X and passes through the center O of the light-emitting partition F; in the direction from the side S2 to the first axis k1, the density of the second dots 16 gradually increases. In this embodiment of the present invention, the backlight surface S3 of the light guide plate 11 also has a plurality of second dots 16, which can disperse the line light source emitted by the lamp group 130 through the second dots 16 to form a surface light source, thereby improving the problem of poor uniformity of the line light source and affecting the display of the image; moreover, in the direction from the side S2 to the first axis k1 (e.g. Figure 7 As shown by the middle arrow c), the density of the second dot 16 gradually increases, which can improve the problem of poor brightness uniformity caused by the light intensity being weaker the farther away from the light-emitting element 1300.
[0061] In one possible implementation, see Figure 6 , Figure 7 As shown, the width f1 of the concave strip group V3 in the first direction X is the same as the width f2 of the groove V2 in the first direction; in the direction perpendicular to the light-emitting surface S1, the groove V2 and the sub-concave strip V30 are spaced apart, that is, the groove V2 and the sub-concave strip V30 are not interconnected.
[0062] In one possible implementation, the cross-sectional shape of the groove V2 perpendicular to the extension direction can be an inverted triangle, an inverted trapezoid, or an inverted semi-ellipse; in one possible implementation, the cross-sectional shape of the sub-groove V30 perpendicular to the extension direction can be triangular, such as... Figure 6 As shown; in another possible implementation, the cross-sectional shape of the sub-recessed strip V30 perpendicular to the extension direction can be trapezoidal, such as... Figure 8 As shown; in another possible implementation, the cross-sectional shape of the sub-recessed strip V30 perpendicular to the extension direction can be semi-elliptical, such as... Figure 9 As shown.
[0063] In one possible implementation, for Figure 6 As shown, when a groove V2 is formed on the light-emitting surface S1 of the light guide plate 11 to serve as a light-receiving structure V, and a set of recessed strips V3 is formed on the backlight surface S3, the following can be used: Figure 11 The process shown forms the light guide plate 11. That is, the light guide plate mold and dot design can be carried out first, then the light guide plate can be injection molded, then high reflective white oil can be printed on the gradient microstructure (recessed strip group V3) of the back light surface of the light guide plate and thermosetting can be performed, and then the light guide plate gate can be cut and polished to complete the light guide plate manufacturing.
[0064] In one possible implementation, see Figure 1 , Figure 6 As shown, the light-receiving structure V satisfies the following relationship:
[0065] A2≤A1<2A3+A2; where A1 represents the maximum width of the light-collecting structure V in the first direction X, A2 represents the maximum width of the gap between adjacent lamp groups 130 in the first direction X, and A3 represents the maximum width of the element in the first direction X. That is, the maximum width A1 of the light-collecting structure V in the first direction X can be greater than or equal to the maximum width A2 of the gap between adjacent lamp groups 130 in the first direction X, so as to effectively gather the light emitted from the lamp group 130 in the current light-emitting zone F; while the maximum width A1 of the light-collecting structure V in the first direction X is less than the sum of the width of the two light-emitting elements 1300 and the gap width, so as to avoid excessive influence of the light-collecting structure V on the uniform light output of the light guide plate 11.
[0066] In one possible implementation, the maximum width A1 of the light-collecting structure V in the first direction X can be equal to the maximum width A2 of the gap between adjacent lamp groups 130 in the first direction X. In this way, while effectively collecting the light rays from the current light-emitting zone F, it also avoids blocking the light rays emitted from the light-emitting element 1300.
[0067] In one possible implementation, combined with Figure 1 or Figure 6As shown, the optical film 12 includes: a diffusion film 121, a first prism 122 located on the side of the diffusion film 121 away from the light guide plate 11, and a second prism 123 located on the side of the first prism 122 away from the light guide plate 11.
[0068] In one possible implementation, combined with Figure 1 or Figure 6 As shown, the backlight module 100 also includes a color conversion film 13 located between the optical film 12 and the light guide plate 11.
[0069] In one possible implementation, combined with Figure 1 or Figure 6 As shown, the material of the light guide plate 11 includes polycarbonate; the light guide plate 11 is reused as a back plate. Optionally, the haze of the light guide plate can be above 96%. Polycarbonate (PC) is an amorphous, odorless, non-toxic, highly transparent colorless or slightly yellow thermoplastic engineering plastic. It has excellent strength and toughness, as well as good heat resistance, electrical insulation, and weather resistance. PC's impact resistance is several times that of general thermoplastics, earning it the reputation of "transparent metal." Its tensile and flexural strength are also outstanding. PC's heat distortion temperature is approximately 135℃, allowing it to maintain stable physical and mechanical properties over a wide temperature range. PC has good electrical insulation properties, making it suitable for producing electrical components and wires and cables. PC has strong resistance to ultraviolet radiation and climate change, and is not prone to discoloration or embrittlement.
[0070] The backlight module provided in this embodiment can be applied to multi-zone, low-cost, high color gamut display products of different sizes. Optionally, the light-emitting element 1300 can be a white or blue light source (specifically, it can be used in conjunction with a color conversion film). Optionally, the high color gamut color conversion material can also be encapsulated inside the light-emitting element (for higher reliability requirements), or it can exist independently as a color conversion film material, as in this embodiment. Figure 1 As shown;
[0071] Based on the same inventive concept, this utility model embodiment also provides a display device, combined with Figure 1 or Figure 6 As shown, the display device includes the backlight module 100 provided in this embodiment of the present invention, and may also include a liquid crystal cell 200 located on the light-emitting side of the backlight module.
[0072] In specific implementations, in the embodiments of this disclosure, the display device can be any product or component with display function, such as a mobile phone, tablet computer, television, monitor, laptop computer, digital photo frame, or navigator. Other essential components of the display device are those that should be understood by those skilled in the art, and will not be described in detail here, nor should they be construed as limiting this disclosure.
[0073] Although preferred embodiments of this disclosure have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this disclosure.
[0074] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.
Claims
1. A backlight module, characterized in that, include: A light guide plate, the light guide plate having a light emitting surface and two side surfaces connected to and opposite to the light emitting surface; The backlight module has an optical film on the light-emitting surface of the light guide plate, and a side light source is provided on at least one of the two side surfaces; the side light source includes: a plurality of lamp groups arranged along a first direction; the extension direction of the side surface and the light-emitting surface connecting edge is the same as the first direction; The light guide plate has at least one light-collecting structure on one side of the light-emitting surface. The light-collecting structure extends from one side to the other side, and at least part of the end of the light-collecting structure is opposite to the gap between adjacent lamp groups, so that the light-collecting structure and the lamp groups form a light-emitting zone. The light-collecting structure is configured to gather the light emitted by the lamp groups in the light-emitting zone to the adjacent light-emitting zones.
2. The backlight module as described in claim 1, characterized in that, The light guide plate includes: a light guide plate body; the light receiving structure is a protrusion formed by the light guide plate body toward the optical film material, and the cross-sectional width of the protrusion gradually decreases in the direction perpendicular to the extension direction in the direction from the light guide plate body toward the optical film material.
3. The backlight module as described in claim 2, characterized in that, The surface of the light guide plate body facing the optical film material and the raised surface also have a plurality of first dots; The light guide plate has a first axis extending along the first direction and passing through the center of the light-emitting zone; the density of the first dots gradually increases in the direction from the side towards the first axis.
4. The backlight module as described in claim 2, characterized in that, The lamp assembly includes: a plurality of light-emitting elements arranged along the first direction; and in the direction from the light guide plate body toward the optical film, the maximum height of the protrusion is greater than the maximum height of the light-emitting elements.
5. The backlight module as described in claim 2, characterized in that, The cross-sectional shape of the protrusion perpendicular to the extension direction includes: triangle, trapezoid, or semi-ellipse.
6. The backlight module as described in claim 1, characterized in that, The light-collecting structure is a groove that extends from the light guide plate toward the surface of the optical film and toward the side away from the optical film. In the direction from the optical film toward the light guide plate, the cross-sectional width of the groove gradually decreases in the direction perpendicular to the extension direction.
7. The backlight module as described in claim 6, characterized in that, The light guide plate also includes a backlight surface opposite to the light-emitting surface; the light guide plate has a set of recessed strips on the backlight surface that are recessed toward the light-emitting surface; the orthographic projection of the set of recessed strips on the light-emitting surface overlaps with the groove. The recessed strip group includes: a plurality of sub-recessed strips arranged along the first direction and extending perpendicular to the first direction; in the same recessed strip group, in the direction along the first direction and from the edge region to the middle region, the height of the sub-recessed strips gradually increases in the direction perpendicular to the light-emitting surface.
8. The backlight module as described in claim 7, characterized in that, The sub-grooves are also filled with white oil.
9. The backlight module as described in claim 8, characterized in that, The backlight surface also has multiple second dots; The light guide plate has a first axis extending along the first direction and passing through the center of the light-emitting zone; the density of the second dots gradually increases in the direction from the side towards the first axis.
10. The backlight module as described in claim 7, characterized in that, The width of the recessed strip group in the first direction is the same as the width of the groove in the first direction; in the direction perpendicular to the light-emitting surface, the groove and the sub-recessed strip are spaced apart.
11. The backlight module as described in claim 1, characterized in that, The light-collecting structure satisfies the following relationship: A2≤A1<2A3+A2; where A1 represents the maximum width of the light-collecting structure in the first direction, A2 represents the maximum width of the gap between adjacent lamp groups in the first direction, and A3 represents the maximum width of the element in the first direction.
12. The backlight module as described in claim 1, characterized in that, The optical film material includes: a diffusion film, a first prism located on the side of the diffusion film opposite to the light guide plate, and a second prism located on the side of the first prism opposite to the light guide plate.
13. The backlight module as described in claim 12, characterized in that, The backlight module further includes a color conversion film located between the optical film and the light guide plate.
14. The backlight module as described in claim 1, characterized in that, The light guide plate is made of polycarbonate; the light guide plate is reused as a back plate.
15. A display device, characterized in that, Includes the backlight module as described in any one of claims 1-14.