Backlight and display module

Abstract

The present invention relates to a backlight source and a display module. The backlight source includes a back panel, a light-emitting component, a light guide plate and an optical film; the light-emitting component and the light guide plate are arranged on the back panel, the light-emitting component is located on the side of the light guide plate, and emits light toward the light guide plate; the optical film is arranged above the light guide plate; the optical film has a first light-transmitting area and a second light-transmitting area; the transmittance of the first light-transmitting area is a set value, and the transmittance of the second light-transmitting area is greater than the transmittance of the first light-transmitting area. The above-mentioned backlight source is divided into a first light-transmitting area and a second light-transmitting area in the optical film, the divided first light-transmitting area has a transmittance equal to the set value, and the second light-transmitting area has a higher transmittance. The brightness difference of the light emitted by the standard brightness area and the dark area of ​​the light-emitting area of ​​the backlight source after passing through the optical film is reduced, so that the light emitted outward from the backlight source can be more uniform in brightness and have higher uniformity.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to a backlight source and a display module. Background Art

[0002] As vehicles become more information-based and intelligent, more and more vehicles are equipped with in-vehicle display terminals, and these in-vehicle display terminals are becoming larger and larger. These in-vehicle display terminals are used as central control displays, instrument panels, and for entertainment purposes.

[0003] One difference between these in-vehicle display terminals and ordinary display products is that, whereas ordinary display products are generally rectangular or rounded-rectangular in shape, these in-vehicle display terminals often have unusual shapes, such as circular, or a combination of circular (semicircular) and rectangular. In these unusually shaped display products, brightness can vary from area to area. This problem arises because the backlight sources of these unusually shaped display products are edge-lit, and some areas are far from the backlight, resulting in lower brightness in these areas and a darker display effect than other areas. Summary of the Invention

[0004] The present invention provides a backlight source and a display module to solve the technical problem of uneven backlight emitted by the backlight source in the prior art.

[0005] The backlight source provided by the present invention includes a back panel, a light-emitting component, a light guide plate and an optical film; the light-emitting component and the light guide plate are arranged on the back panel, the light-emitting component is located on the side of the light guide plate and emits light toward the light guide plate; the optical film is arranged above the light guide plate; the optical film has a first light-transmitting area and a second light-transmitting area; the transmittance of the first light-transmitting area is a set value, and the transmittance of the second light-transmitting area is greater than the transmittance of the first light-transmitting area.

[0006] In which, the light-emitting area of ​​the backlight source includes at least two sub-light-emitting areas, each of the sub-light-emitting areas is any one of a polygon, a circle, an ellipse, and a closed figure composed of a straight line and a curve; a partial area of ​​each sub-light-emitting area is connected to or overlaps with the adjacent sub-light-emitting area, and the edge of each sub-light-emitting area includes a first edge area connected to or overlaps with the adjacent sub-light-emitting area, and a second edge area outside the first edge area; the outline of the light-emitting area of ​​the backlight source includes the second edge area of ​​each sub-light-emitting area.

[0007] Wherein, in the outline of the light-emitting area of ​​the backlight source, the second edge areas of two adjacent sub-light-emitting areas are tangent or smoothly transitioned with rounded corners.

[0008] The light-emitting component is a light bar, a plurality of light-emitting devices are arranged on the light bar, and the light bar is arranged on one side of the back plate.

[0009] Wherein, in the optical film, the first light-transmitting area is adjacent to the light-emitting component, and the second light-transmitting area is far away from the light-emitting component.

[0010] Wherein, a slide groove is provided on the back plate, and a notch is provided at one end of the slide groove, and the light bar can slide into the slide groove or slide out of the slide groove along the notch.

[0011] The slide groove is formed by a guide rail; the guide rail is welded to the back panel or is integrally formed with the back panel; or the backlight source further includes a plastic frame, the plastic frame is combined with the guide rail in an integrated manner of glue and iron, and the plastic frame serves as at least one side wall of the slide groove.

[0012] In which, the optical film includes a substrate and an anti-reflection layer formed on the substrate, the anti-reflection layer has a micro-prismatic structure; the transmittance of each micro-prismatic structure in the second light-transmitting area is greater than the transmittance of each micro-prismatic structure in the first light-transmitting area; and / or the transmittance of the material of the micro-prismatic structure in the second light-transmitting area is greater than the transmittance of the micro-prismatic structure in the first light-transmitting area.

[0013] The light transmittance of the second light-transmitting area is greater than 1.05 times the light transmittance of the first light-transmitting area.

[0014] The display module provided by the present invention includes a liquid crystal display panel and the above-mentioned backlight source.

[0015] Wherein, the display module includes a vehicle-mounted display terminal.

[0016] The backlight source and display module provided by the present invention have the following advantages over the prior art:

[0017] The backlight source and display module provided by the present invention divide the optical film into a first light-transmitting area and a second light-transmitting area, the divided first light-transmitting area has a transmittance equal to a set value, and the second light-transmitting area has a higher transmittance. The division of the first light-transmitting area and the second light-transmitting area can compensate and correct the uneven brightness of different areas of the luminous area. Specifically, the area in the optical film corresponding to the standard brightness area in the luminous area is set as the first light-transmitting area, and the area in the optical film corresponding to the dark area in the luminous area is set as the second light-transmitting area. For the standard brightness area of ​​the luminous area, the light emitted has a higher brightness before passing through the optical film, but the transmittance of this part of the light is low when passing through the optical film (compared to the second light-transmitting area); and for the dark area of ​​the luminous area, the light emitted has a lower brightness before passing through the optical film, but the transmittance of this part of the light is higher when passing through the optical film (compared to the first light-transmitting area). The brightness difference between the light emitted from the standard brightness area and the dark area of ​​the above-mentioned luminous area is reduced or even eliminated after passing through the optical film, so that the light emitted from the backlight source is more uniform in brightness and has higher uniformity. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0020] Figure 1 Schematic diagram of the structure of the backlight source in an embodiment of the present invention when viewed from above (with the front frame omitted);

[0021] Figure 2 for Figure 1 A schematic diagram of a first light-transmitting area and a second light-transmitting area in an optical film of the backlight source;

[0022] Figure 3 Schematic diagram of the layer structure of the backlight source in an embodiment of the present invention;

[0023] Figure 4 A schematic diagram of the shape of a light-emitting area in one embodiment of the present invention;

[0024] Figure 5 A schematic diagram of the shape of the light-emitting area in another embodiment of the present invention;

[0025] Figure 6A schematic diagram of the shape of the light-emitting area in another embodiment of the present invention;

[0026] Figure 7 This is a schematic diagram of a light-emitting component installed on a back panel in an embodiment of the present invention;

[0027] Figure 8 A schematic diagram of a light bar and a light-emitting device being engaged in a slide groove in an embodiment of the present invention;

[0028] Figure 9 Schematic diagram of the structure of an optical film in an embodiment of the present invention.

[0029] In the picture:

[0030] 10-back plate; 101-slide; 102-notch;

[0031] 11-light emitting assembly; 111-light bar; 112-light emitting device;

[0032] 12-optical film; 121-first light-transmitting area; 122-second light-transmitting area; 123-substrate; 124-antireflection layer; 1241-microprism mechanism;

[0033] 13-light guide plate;

[0034] 14-plastic frame;

[0035] 15-front frame;

[0036] S-luminous zone. DETAILED DESCRIPTION

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0038] The following describes embodiments of the backlight source and display module provided by the present invention in conjunction with the accompanying drawings.

[0039] In an embodiment of the backlight source of the present invention, see Figures 1 to 3The backlight source includes a back panel 10, a light-emitting component 11, an optical film 12, a light guide plate 13, a plastic frame 14 and a front frame 15. Among them, the back panel 10 and the front frame 15 constitute the frame structure of the backlight source, and the back panel 10 and the front frame 15 are connected by the plastic frame 14. The light-emitting component 11 and the light guide plate 13 are arranged on the back panel 10, and the light-emitting component 11 is located on the side of the light guide plate 13 and emits light toward the light guide plate 13. Specifically, the backlight source in this embodiment is a side-entry backlight source, and the light-emitting component 11 is arranged on one side of the back panel 10 and on the side of the light guide plate 13; the light emitted by the light-emitting component 11 irradiates the light guide plate 13 and spreads across the light guide plate 13 to form a surface light source, and one side of the light guide plate 13 (the side facing the front frame 15, which can be called the upper side) is the light-emitting area S. The optical film 12 is arranged above the light guide plate 13; the optical film 12 has a first light-transmitting area 121 and a second light-transmitting area 122; the transmittance of the first light-transmitting area 121 is a set value, and the transmittance of the second light-transmitting area 122 is greater than the transmittance of the first light-transmitting area 121.

[0040] In the backlight source of the present embodiment, due to the shape structure of the backlight source (for example, different areas have different distances from the light-emitting component 11) or other factors, different areas will present different brightnesses on the light-emitting area S of the surface light source formed by the light-emitting component 11 and the light guide plate 13. The brightness of some areas can reach the predetermined expected value (hereinafter referred to as the standard brightness area), while the brightness of other areas cannot reach the predetermined expected value (hereinafter referred to as the dark area). The reason why the brightness of these dark areas cannot reach the predetermined expected value is, for example, that the distance between these areas and the light-emitting component 11 is relatively far, and the light emitted by the light-emitting component 11 is significantly attenuated and absorbed in the process of reaching these areas, resulting in the brightness of these areas being dark and unable to reach the predetermined expected value.

[0041] In this embodiment, the division of the optical film 12 into the first light-transmitting area 121 and the second light-transmitting area 122 is used to compensate and correct the uneven brightness of different areas of the above-mentioned light-emitting area S. Specifically, the area of ​​the optical film 12 corresponding to the standard brightness area in the light-emitting area S is set as the first light-transmitting area 121, and the area of ​​the optical film 12 corresponding to the dark area in the light-emitting area S is set as the second light-transmitting area 122. For the standard brightness area of ​​the light-emitting area S, the light emitted therefrom has a higher brightness before passing through the optical film 12, but the transmittance of this part of the light when passing through the optical film 12 is lower (compared to the second light-transmitting area 122); while for the dark area of ​​the light-emitting area S, the light emitted therefrom has a lower brightness before passing through the optical film 12, but the transmittance of this part of the light when passing through the optical film 12 is higher (compared to the first light-transmitting area 121). The brightness difference of the light emitted from the standard brightness area and the dark area of ​​the above-mentioned light-emitting area S is reduced or even eliminated after passing through the optical film 12, so that the brightness of the light emitted outward from the backlight source can be more uniform and have higher uniformity.

[0042] For example, there is a part in the standard brightness area of ​​the light-emitting area S, which is called the first area, and the brightness of the light emitted by it is 1; there is a part in the dark area of ​​the light-emitting area S, which is called the second area, and the brightness of the light emitted by it is 0.95; the transmittance of the first light-transmitting area 121 corresponding to the first area is 1 (the transmittance of 1 is only for illustration and reference, has nothing to do with the actual transmittance percentage, and does not have the meaning of 100% transmittance), and the transmittance of the second light-transmitting area 122 corresponding to the second area is 1.05 (same as above, the transmittance The value of 1.05 is for illustration and reference only and has nothing to do with the actual transmittance percentage and does not mean that the transmittance is 105%); after calculation, the brightness of the light emitted by the first area after passing through the optical film 12 is 1, and the brightness of the light emitted by the second area after passing through the optical film 12 is 0.9975, and the brightness ratio of the two is 99.75%. Compared with the brightness ratio of the second area to the first area before passing through the optical film 12, which is 95%, the brightness difference between the two areas is smaller after passing through the optical film 12.

[0043] For the dark area of ​​the luminous zone S, different areas within it may have different brightness. For example, at different positions in the dark area, the ratio of its brightness to the standard brightness area may be 95%, 90%, 87%, etc. In the backlight source of the embodiment of the present invention, the second light-transmitting area 122 may include multiple sub-areas, and the multiple sub-areas have different transmittances, but the transmittance of each sub-area is greater than the transmittance of the first light-transmitting area 121. The sub-area with the highest transmittance corresponds to the part with the lowest brightness in the dark area of ​​the luminous zone S, and the sub-area with the lowest transmittance corresponds to the part with the highest brightness in the dark area of ​​the luminous zone S. The same applies to other sub-areas. Through such an arrangement, the light emitted from different parts of the dark area in the luminous zone S can present a more consistent and uniform brightness after passing through the optical film 12, which helps to achieve a better display effect for the backlight source when applied to liquid crystal display products.

[0044] In one embodiment of the backlight source, the light-emitting area S of the backlight source includes at least two sub-light-emitting areas, each sub-light-emitting area is any one of a polygon, a circle, an ellipse, and a closed figure composed of a straight line and a curve; a partial area of ​​each sub-light-emitting area is connected to or overlaps with an adjacent sub-light-emitting area, and the edge of each sub-light-emitting area includes a first edge area connected to or overlaps with the adjacent sub-light-emitting area, and a second edge area outside the first edge area; the outline of the light-emitting area of ​​the backlight source includes the second edge area of ​​each of the sub-light-emitting areas.

[0045] like Figure 1 and Figure 2 As shown, the light-emitting area S of the backlight source includes two circular sub-light-emitting areas, which are arranged on the left and the right and partially intersect with each other; based on this structure, the edge of the circular sub-light-emitting area on the left includes a first edge area on the right and a second edge area on the left, and the edge of the circular sub-light-emitting area on the right includes a first edge area on the left and a second edge area on the right; among the edges of the above two sub-light-emitting areas, the first edge area of ​​each sub-light-emitting area is surrounded by the other sub-light-emitting area, and the second edge area is exposed at the edge of the light-emitting area S of the backlight source, thereby, the outline of the light-emitting area S is composed of the second edge area of ​​the circular sub-light-emitting area on the left and the second edge area of ​​the circular sub-light-emitting area on the right.

[0046] Similarly, in Figure 4 In the structure shown, the light-emitting area S of the backlight source includes three sub-light-emitting areas, namely, circular sub-light-emitting areas on both sides and a rectangular sub-light-emitting area in the middle. The height of the rectangular sub-light-emitting area is equal to the diameter of the circular sub-light-emitting area. Figure 4 In the structure shown, each of the two circular sub-light-emitting areas has a semicircle that overlaps with the rectangular sub-light-emitting area. Figure 4In the structure shown, the light-emitting area S of the backlight source is composed of the left edge of the left circular sub-light-emitting area (its second edge area) and the right edge of the right circular sub-light-emitting area (its second edge area), as well as the upper and lower edges of the rectangular sub-light-emitting area (its second edge area).

[0047] Figure 5 The structure shown is Figure 4 Similarly, the difference is that the height of the rectangular sub-light-emitting area in the middle is smaller than the diameter of the circular sub-light-emitting areas on both sides, which will not be repeated.

[0048] exist Figure 6 In the structure shown, the light emitting area S of the backlight source includes three sub-light emitting areas, which are all circular and arranged in sequence in a straight line, and two adjacent sub-light emitting areas partially overlap. Figure 6 In the structure shown, the light-emitting area S of the backlight source is composed of the left edge of the left circular sub-light-emitting area (its second edge area) and the right edge of the right circular sub-light-emitting area (its second edge area), as well as the upper and lower edges of the middle circular sub-light-emitting area (its second edge area).

[0049] Specifically, in the outline of the light-emitting area S of the backlight source, the second edge areas of two adjacent sub-light-emitting areas are tangent or smoothly transitioned with rounded corners. Figure 1 、 Figure 2 and Figure 5 、 Figure 6 In the structure shown, the second edge regions of two adjacent sub-light-emitting regions have a shape with rounded corners and a smooth transition, while Figure 4 In the structure shown, the second edge regions of two adjacent sub-light-emitting regions have a tangent shape, which can avoid sharp corners in the backlight source.

[0050] The backlight source having the aforementioned luminous area S exhibits a special shape. In such backlight sources, particularly edge-lit backlights, the light-emitting component 11 is disposed on one side of the backplane 10. Different locations of the luminous area S are located at different distances from the light-emitting component 11, which can easily result in different brightness levels at different locations in the luminous area S, resulting in uneven luminance within the luminous area S. In this embodiment, by providing a first light-transmitting area 121 and a second light-transmitting area 122 having different light transmittances within the optical film 12, this uneven luminance can be corrected and compensated. Therefore, the technical solution of the present invention is particularly suitable for backlight sources having the aforementioned luminous area S, and its application can achieve more significant beneficial effects.

[0051] Of course, for backlight sources with light-emitting areas S of other shapes, if there is a problem of uneven brightness in different areas of the light-emitting area S, the technical solution of the present invention can also be applied and significant improvement can be achieved.

[0052] In one embodiment of the backlight source, Figure 2 As shown, the light emitting assembly 11 includes a light bar 111 , on which a plurality of light emitting devices 112 are arranged. The light bar 111 is arranged on one side of the back plate 10 .

[0053] Specifically, the light-emitting device 112 can be an LED (or Mini LED, etc.), and multiple light-emitting devices 112 are arranged at intervals and connected on a light bar 111. A conductive circuit is provided on the light bar 111 for supplying power to the light-emitting device 112 and transmitting various signals. Through these conductive circuits, the power supply can supply power to the light-emitting device 112 to achieve light emission, and the corresponding controller can send a control signal to the light-emitting device 112 to achieve switch control or other function control of the light-emitting device 112.

[0054] In this embodiment, the light bar 111 is disposed on one side of the back panel 10, that is, the light bar 111 is disposed on the side of the light guide plate 13, and the backlight source is an edge-type backlight structure. As mentioned above, the edge-type backlight is one of the most common backlight structures. This structure is relatively thin, which helps to achieve a thinner and lighter display product.

[0055] In one embodiment of the backlight source, in the optical film 12 , the first light-transmitting area 121 is adjacent to the light-emitting component 11 , and the second light-transmitting area 122 is away from the light-emitting component 11 .

[0056] As described above, locations farther from the light-emitting component 11 have lower brightness than locations closer to the light-emitting component 11. In this embodiment, the area farther from the light-emitting component 11 is set as the second light-transmitting area 122, and the area closer to the light-emitting component 11 is set as the first light-transmitting area 121. This arrangement allows the second light-transmitting area 122 to compensate and correct the darker areas farther from the light-emitting component 11, achieving a brightness close to or consistent with that of the areas closer to the light-emitting component 11, thereby making the brightness of the light emitted by various areas within the light-emitting area S more uniform.

[0057] In one embodiment of the backlight source, Figure 7 and Figure 8As shown, a slide groove 101 is provided on the back panel 10, and a notch 102 is provided at one end of the slide groove 101. The light bar 111 can slide into the slide groove 101 or slide out from the slide groove 101 along the notch 102. Under this structure, when the light-emitting component 11 is installed on the back panel 10, or when the light-emitting component 11 is removed from the back panel 10, the light bar 111 can be slid into the slide groove 101 or pulled out from the slide groove 101 through the notch 102. This installation or removal method is more convenient. When the light bar 111 or the light-emitting device 112 in the light-emitting component 11 is damaged and needs to be replaced, it is only necessary to pull out the damaged light-emitting component 11 from the notch 102 and insert a new light-emitting component 11 into the slide groove 101, without having to replace the entire back panel 10 or remove the back panel 10 as a whole.

[0058] Specifically, the slide groove 101 is formed by a guide rail; the guide rail is welded to the back plate 10 or is integrally formed with the back plate 10 .

[0059] As mentioned above, the backlight source further includes a plastic frame 14, which is used to connect the back plate 10 and the front frame 15. In the actual implementation of the present invention, as an alternative, the plastic frame 14 can also be combined with the guide rail in an integrated manner of plastic and iron, and the plastic frame 14 serves as at least one side wall of the slide groove 101.

[0060] In one embodiment of the backlight source, Figure 9 As shown, the optical film 12 includes a substrate 123 and an anti-reflection layer 124 formed on the substrate 123. The anti-reflection layer 124 has a micro-prismatic structure 1241. The light transmittance of each micro-prismatic structure 1241 in the second light-transmitting region 122 is greater than the light transmittance of each micro-prismatic structure 1241 in the first light-transmitting region 121. In this structure, the micro-prismatic structures 1241 in the first light-transmitting region 121 and the second light-transmitting region 122 have different shapes. Based on this difference in shape and structure, the light transmittance of the second light-transmitting region 122 is greater than the light transmittance of the first light-transmitting region 121.

[0061] Based on this embodiment, the light transmittance of the material of the microprismatic structures 1241 in the second light-transmitting region 122 can be further configured to be greater than the light transmittance of the microprismatic structures 1241 in the first light-transmitting region 121. In this configuration, not only do the microprismatic structures 1241 in the first and second light-transmitting regions 121, 122 have different shapes, but they also have different materials. Specifically, the light transmittance of the material of the microprismatic structures 1241 in the second light-transmitting region 122 is greater than the light transmittance of the material of the microprismatic structures 1241 in the first light-transmitting region 121. Due to the different shapes, structures, and materials of the first and second light-transmitting regions 121, 122, the light transmittance of the second light-transmitting region 122 is greater than that of the first light-transmitting region 121.

[0062] Of course, in actual implementations of the present invention, it is also possible to set the light transmittance of the material of the micro-prismatic structures 1241 in the second light-transmitting region 122 to be greater than the light transmittance of the micro-prismatic structures 1241 in the first light-transmitting region 121. In this structure, based on the difference in the materials of the micro-prismatic structures 1241 in the first light-transmitting region 121 and the second light-transmitting region 122, the light transmittance of the second light-transmitting region 122 can be greater than the light transmittance of the first light-transmitting region 121.

[0063] In practice, on the light guide plate 13, the brightness of areas farther from the light-emitting assembly 11 is dimmer than that of areas closer to the light-emitting assembly 11, with the ratio between the two typically being around 95%. In this case, the transmittance of the second light-transmitting area 122 is at least 1.05 times that of the first light-transmitting area 121. With this arrangement, after compensation and correction by the second light-transmitting area 122, the brightness of the first light-transmitting area 121 and the brightness of the second light-transmitting area 122 in the light-emitting area S are essentially close to or identical, thereby achieving more uniform backlighting.

[0064] In summary, the backlight provided by the above-described embodiment of the present invention divides the optical film 12 into a first light-transmitting area 121 and a second light-transmitting area 122. The divided first light-transmitting area 121 has a transmittance equivalent to a set value, while the second light-transmitting area 122 has a higher transmittance. The division of the first light-transmitting area 121 and the second light-transmitting area 122 can compensate for and correct the uneven brightness of different areas of the light-emitting area S. Specifically, the area of ​​the optical film 12 corresponding to the standard brightness area within the light-emitting area S is set as the first light-transmitting area 121, and the area of ​​the optical film 12 corresponding to the darker area within the light-emitting area S is set as the second light-transmitting area 122. For the standard brightness area of ​​the luminous zone S, the light emitted has a higher brightness before passing through the optical film 12, but the transmittance of this part of the light is lower when passing through the optical film 12 (compared to the second light-transmitting area 122); for the dark area of ​​the luminous zone S, the light emitted has a lower brightness before passing through the optical film 12, but the transmittance of this part of the light when passing through the optical film 12 is higher (compared to the first light-transmitting area 121). The brightness difference between the light emitted from the standard brightness area and the dark area of ​​the luminous zone S after passing through the optical film 12 is reduced or even eliminated, thereby making the light emitted outward from the backlight source more uniform in brightness and has a higher uniformity.

[0065] In one embodiment of the display module of the present invention, the display module includes a liquid crystal display panel and the backlight source described in the above embodiment.

[0066] The display module of the embodiment of the present invention can specifically be a vehicle-mounted display terminal. Existing vehicle-mounted display terminals are more likely to be set to non-rectangular special shapes based on vehicle interior design or functional design considerations, especially for vehicle-mounted display terminals used on instrument panels and central control screens. In these display modules with special shapes, the problem of uneven display brightness caused by uneven backlight emitted by the backlight source is more likely to occur. When the display module in this embodiment is used as a vehicle-mounted display terminal, since the backlight source used in the display module of this embodiment eliminates the problem of uneven backlight emission, the brightness of the light irradiated to each area of ​​the liquid crystal display panel has a high uniformity. When displaying, the display brightness of each area of ​​the vehicle-mounted display terminal can be made consistent, with a better display effect.

[0067] The display module of the embodiment of the present invention can also be used in fields and products other than the vehicle-mounted display terminal, and has the same beneficial effects as described above.

[0068] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0069] The foregoing description is intended only to provide specific embodiments of the present invention, which will enable those skilled in the art to understand and implement the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not intended to be limited to the embodiments shown herein, but is intended to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A backlight source, characterized in that: The backlight source includes a back panel, a light emitting component, a light guide plate and an optical film; the light emitting component and the light guide plate are arranged on the back panel, the light emitting component is located on the side of the light guide plate and emits light toward the light guide plate; The optical film is arranged above the light guide plate; The optical film has a first light-transmitting area and a second light-transmitting area; the light transmittance of the first light-transmitting area is a set value, and the light transmittance of the second light-transmitting area is greater than the light transmittance of the first light-transmitting area; The light-emitting area of ​​the backlight source includes a standard brightness area and a dark area, the brightness of the standard brightness area can reach a predetermined expected value, and the brightness of the dark area cannot reach the predetermined expected value, and the brightness of the light emitted by the dark area is lower than the brightness of the light emitted by the standard brightness area, the first light-transmitting area corresponds to the standard brightness area, and the second light-transmitting area corresponds to the dark area; Wherein, different parts of the dark area have different brightness, the second light-transmitting area includes multiple sub-areas, the multiple sub-areas have different transmittances, and the transmittance of each sub-area is greater than the transmittance of the first light-transmitting area; among the multiple sub-areas, the sub-area with the highest transmittance corresponds to the part with the lowest brightness in the dark area, the sub-area with the lowest transmittance corresponds to the part with the highest brightness in the dark area, and so on for the other sub-areas; The optical film includes a substrate and an anti-reflection layer formed on the substrate. The anti-reflection layer has a micro-prism structure. The light transmittance of the material of the micro-prism structure in the second light-transmitting area is greater than the light transmittance of the micro-prism structure in the first light-transmitting area.

2. The backlight source according to claim 1, wherein: The light-emitting area of ​​the backlight source includes at least two sub-light-emitting areas, each of which is any one of a polygon, a circle, an ellipse, and a closed figure composed of a straight line and a curve; A portion of each sub-light-emitting area is connected to or overlaps with an adjacent sub-light-emitting area, and an edge of each sub-light-emitting area includes a first edge area connected to or overlaps with the adjacent sub-light-emitting area, and a second edge area outside the first edge area; The outline of the light-emitting area of ​​the backlight source includes a second edge area of ​​each of the sub-light-emitting areas.

3. The backlight source according to claim 2, wherein: In the outline of the light-emitting area of ​​the backlight source, the second edge areas of two adjacent sub-light-emitting areas are tangent to each other or smoothly transition with rounded corners.

4. The backlight source according to claim 1, wherein: The light emitting component is a light bar, a plurality of light emitting devices are arranged on the light bar, and the light bar is arranged on one side of the back plate.

5. The backlight source according to claim 4, wherein: In the optical film, the first light-transmitting area is adjacent to the light-emitting component, and the second light-transmitting area is away from the light-emitting component.

6. The backlight source according to claim 4, wherein: A slide groove is provided on the back plate, and a notch is provided at one end of the slide groove. The light bar can slide into the slide groove or slide out of the slide groove along the notch.

7. The backlight source according to claim 6, wherein: The chute is formed by a guide rail; The guide rail is welded to the back plate or is integrally formed with the back plate; or The backlight source further includes a plastic frame, which is combined with the guide rail in a plastic-iron integrated manner, and the plastic frame serves as at least one side wall of the sliding groove.

8. The backlight source according to claim 1, wherein: The light transmittance of each of the micro-prismatic structures in the second light-transmitting area is greater than the light transmittance of each of the micro-prismatic structures in the first light-transmitting area.

9. The backlight source according to claim 1 or 8, wherein: The light transmittance of the second light-transmitting area is greater than or equal to 1.05 times the light transmittance of the first light-transmitting area.

10. A display module, characterized in that: The display module includes a liquid crystal display panel and the backlight source according to any one of claims 1 to 9.

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