Backlight module, display device and electronic equipment

Abstract

The utility model discloses a backlight module, a display device and electronic equipment, and belongs to the technical field of display. The backlight module comprises a light guide plate, light-emitting elements arranged on at least one side face of the light guide plate, a diffusion sheet arranged in the light emitting direction of the light guide plate, and a first black ink layer and a first white ink layer which are arranged between the light guide plate and the diffusion sheet and are adjacent to the light-emitting elements on at least one side face. Wherein the first white ink layer is arranged close to the light guide plate. The first white ink layer can increase reflection utilization of light and improve brightness, correspondingly, a target brightness value can be achieved when a low-brightness film material is used, and cost can be reduced.

Description

Technical Field

[0001] The present application belongs to the field of display technology, and in particular relates to a backlight module, a display device and an electronic device. Background Art

[0002] In order to improve the user experience outdoors, the brightness of LCD modules is getting higher and higher. Currently, this is mainly achieved by increasing the transmittance of LCD panels, but the improvement effect is limited. How to balance the goals of reducing costs and increasing brightness while ensuring the user's demand for thinness and long battery life is a current research direction. Summary of the invention

[0003] The present application provides a backlight module, a display device and an electronic device, aiming to reduce costs and improve display brightness.

[0004] In a first aspect, an embodiment of the present application provides a backlight module, comprising a light guide plate, a light emitting element disposed on at least one side of the light guide plate, a diffuser disposed in the light emitting direction of the light guide plate, and a first black ink layer and a first white ink layer disposed between the light guide plate and the diffuser and adjacent to at least one side of the light emitting element. The first white ink layer is disposed close to the light guide plate.

[0005] In some embodiments, the diffusion sheet sequentially forms a first black ink layer and a first white ink layer on a surface adjacent to the light guide plate.

[0006] In some embodiments, the first black ink layer is closer to an edge of the backlight emission area than the first white ink layer.

[0007] In some embodiments, the first black ink layer exceeds the first white ink layer by a dimension greater than or equal to 0.2 mm.

[0008] In some embodiments, a first white ink layer and a first black ink layer are sequentially formed on a surface of the light guide plate adjacent to the diffusion sheet.

[0009] In some embodiments, the first black ink layer is formed on the diffusion sheet, and the first white ink layer is formed on the light guide plate.

[0010] In some embodiments, the light emitting element is fixed on a light bar, and the light bar is fixed on a light guide plate by a light bar tape, wherein the light bar tape includes a transparent film layer, a second white ink layer located on both sides of the transparent film layer, and an adhesive formed on the outside of the second white ink layer.

[0011] In some embodiments, a white covering layer is formed on the light bar on the same side surface as the light emitting element, and the light bar tape is fixedly connected to the white covering layer by an adhesive.

[0012] In some embodiments, the light guide plate is a polygonal structure, and the light emitting elements are arranged on one side or multiple sides of the light guide plate.

[0013] In some embodiments, the light guide plate is a quadrilateral structure, and the light emitting elements are disposed on one side surface or two opposite side surfaces of the light guide plate.

[0014] In the embodiment of the present application, the backlight module is provided with a light-emitting element on at least one side of the light guide plate to provide a light source. The light guide plate uniformly guides the light emitted by the light-emitting element to the display area, and the diffuser arranged in the light-emitting direction of the light guide plate further uniformly scatters the light. A first black ink layer and a first white ink layer are arranged between the light guide plate and the diffuser and adjacent to at least one side of the light-emitting element. Among them, the first black ink layer is used to improve the poor display effect at the lamp port position, and the first white ink layer is arranged closer to the light guide plate. The reflection of the light can be increased by the first white ink layer, and the light energy absorbed by the first black ink layer can be reduced, thereby reducing the light energy loss on the light path from the light-emitting element to the backlight light-emitting area, so that more light energy can be projected into the backlight light-emitting area, thereby improving the brightness of the backlight module, and even when using a lower brightness film material, the target brightness value can be achieved, which can reduce costs.

[0015] In the second aspect, the embodiment of the present application further provides a display device, including the backlight module mentioned in any embodiment of the first aspect, and a liquid crystal display panel located in the light emitting direction of the backlight module. In the display device, the backlight module is provided with a first white ink layer to increase the reflection utilization of the light provided by the light emitting element, and reduce the light energy absorbed by the first black ink layer, thereby reducing the light loss on the light path from the light emitting element to the backlight emitting area, so that more light can be projected into the backlight emitting area, and more projected light is displayed through the liquid crystal display panel. The required interface, thereby achieving an improvement in the brightness of the display device, even if the backlight module uses a lower brightness film material, the target brightness value can be achieved, which can reduce costs.

[0016] In a third aspect, an embodiment of the present application further provides an electronic device, comprising the display device mentioned in the second aspect. The electronic device has the same beneficial effects as the display device mentioned above, which will not be described in detail here.

[0017] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1It is a structural schematic diagram of a backlight module in the related art;

[0020] Figure 2 for Figure 1 A schematic diagram of a partial structure of a backlight module is shown;

[0021] Figure 3 for Figure 1 Another partial structural schematic diagram of the backlight module shown;

[0022] Figure 4 A schematic diagram of the structure of a backlight module provided in an embodiment of the present application;

[0023] Figure 5 for Figure 4 A schematic diagram of a partial structure of a backlight module is shown;

[0024] Figure 6 A schematic diagram of the formation positions of a first black ink layer and a first white ink layer provided in an embodiment of the present application;

[0025] Figure 7 Another schematic diagram of the formation position of the first black ink layer and the first white ink layer provided in an embodiment of the present application;

[0026] Figure 8 A schematic diagram of the formation positions of another first black ink layer and a first white ink layer provided in an embodiment of the present application;

[0027] Fig. 9 for Figure 4 Another partial structural schematic diagram of the backlight module shown;

[0028] Fig.10 A schematic diagram of a partial structure of another backlight assembly provided in an embodiment of the present application;

[0029] Fig.11 A schematic diagram of the structure of a display device provided in an embodiment of the present application;

[0030] Fig.12 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0031] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0032] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0033] In the description of the present application, “plurality” means two or more.

[0034] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0035] When describing some embodiments, the expression "connected" and its derivatives may be used. The term "connected" should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. The term "electrically connected" indicates, for example, that two or more components are in direct physical or electrical contact, and may also mean that two or more components are not in direct contact with each other, but still cooperate or interact with each other. The embodiments disclosed herein are not necessarily limited to the contents of this document.

[0036] Additionally, the use of “based on” is meant to be open and inclusive, as a process, step, calculation, or other action “based on” one or more stated conditions or values ​​may, in practice, be based on additional conditions or values ​​beyond those stated.

[0037] It will be understood that when a layer or an element is referred to as being on another layer or substrate, it can be directly on the other layer or substrate, or intervening layers may be present between the layer or element and the other layer or substrate.

[0038] Exemplary embodiments are described herein with reference to cross-sectional views that are idealized exemplary drawings. In the drawings, the thickness of layers and the area of ​​regions are exaggerated for clarity. Therefore, variations in shape relative to the drawings due to, for example, manufacturing techniques and / or tolerances are conceivable. Therefore, the exemplary embodiments should not be interpreted as being limited to the shapes of the regions shown herein, but include deviations in shape due to, for example, manufacturing. Therefore, the regions shown in the drawings are schematic in nature, and their shapes are not intended to illustrate the actual shape of regions of the device, and are not intended to limit the scope of the exemplary embodiments.

[0039] Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0040] In order to improve the user experience outdoors, the brightness of LCD modules is getting higher and higher. Currently, this is mainly achieved by increasing the transmittance of LCD panels, but various solutions have certain shortcomings. For example, the solution of thinning the wiring of LCD panels will bring the risk of disconnection and reduce product reliability; or the solution of introducing high-transmittance materials into LCD panels will increase costs, and there is limited room for brightness improvement. If the current of the light-emitting element is increased or the number of light-emitting elements is increased, the power consumption will increase, the battery life of the device will be shortened, and the user's usage needs will not be met.

[0041] To this end, the present application provides a backlight module, which improves the brightness by improving the reflection and utilization of light by the backlight module. On this basis, the target brightness value can be achieved even when using a film material with lower brightness, which can reduce costs.

[0042] In related technologies, such as Figure 1 to Figure 3 As shown, Figure 1 is a structural schematic diagram of a backlight module in the related art, Figure 2 for Figure 1 The partial structural diagram of the backlight module is shown in FIG. Figure 3 for Figure 1 Another partial structural schematic diagram of the backlight module is shown.

[0043] like Figure 1 The backlight module shown includes a spacer sheet 1, a light shielding glue 2, an upper prism 3, a lower prism 4, a diffuser sheet 5, a black stripe 6, a first black ink layer 7, a light guide plate 8, a reflective sheet 9, an iron frame 10, a glue frame 11, a light strip 12, a light strip adhesive tape 13, and a light emitting element 14. The black stripe 6 is located on a side of the diffuser sheet 5 away from the light guide plate 8, and the first black ink layer 7 is located on a side of the diffuser sheet 5 adjacent to the light guide plate 8.

[0044] exist Figure 1 In the figure, AA represents the active area, which corresponds to the portion of the display panel that can actually display the image, and VA represents the viewing area, which includes the above-mentioned display area AA and expands the range of the above-mentioned display area AA to ensure that the light provided by the backlight module can be evenly projected into the display area AA of the entire display panel, and can provide uniform brightness and color performance.

[0045] In the above-mentioned backlight module, the light bar 12 is the light source of the backlight module, which usually includes a plurality of light-emitting elements. The light bar tape 13 is used to fix the position of the light bar. The light-emitting element 14 is a light-emitting body arranged on the light bar 12. For example, when the light bar 12 includes a plurality of LED light-emitting elements, the light-emitting element 14 can be an LED lamp bead, which is used to output the original light source light. The light guide plate 8 is used to guide and diffuse the light emitted by the light-emitting element 14, and evenly guide the light to the display area AA to form a uniform surface light source. The diffuser 5 is used to diffuse the light, further evenly scatter the light, reduce the uneven brightness and the light spot phenomenon, and make the light softer and more uniform. The first black ink layer 7 on the side of the diffuser 5 adjacent to the light guide plate 8 is to improve the poor display effect of the lamp port position, such as the light spot or firefly effect caused by the local uneven brightness. The first black ink layer 7 can absorb excess light and reduce the brightness of these uneven areas, thereby improving the display effect.

[0046] In addition, among the other components of the above-mentioned backlight module, the spacer 1 is usually used to support and fix other components in the backlight module, the light-shielding glue 2 is used to block unnecessary light and prevent the light from leaking from the edge of the backlight module, the upper prism 3 and the lower prism 4 are used to adjust the direction and distribution of the light, the black strip 6 on the side of the diffuser away from the light guide plate is used to block the light and further control the light distribution, the reflective sheet 9 is used to reflect the light and reduce the light loss so that the light is emitted along the light-emitting direction, the iron frame 10 and the glue frame 11 are used to fix other components, provide mechanical strength and protection, and prevent the intrusion of dust and moisture.

[0047] However, if Figure 2 As shown, in the light path from the light emitting element 14 to the backlight light emitting area VA, when the light emitted by the light emitting element 14 is transmitted in the light guide plate 8, the first black ink layer 7 will also absorb the light from the light source in the backlight module, reducing the reflection utilization rate of the light from the light source.

[0048] For example, Figure 2As shown, the light A emitted by the light emitting element 14 is reflected and refracted on the surface of the light guide plate 8 when it is conducted inside the light guide plate 8. For example, part of the light A is reflected back on the upper surface of the light guide plate 8. At the same time, another part of the light A escapes from the upper surface of the light guide plate 8 through refraction and contacts the first black ink layer 7. This part of the refracted light is absorbed by the first black ink layer 7 and cannot reach the backlight luminous area VA, thereby causing the loss of the light source light emitted by the light emitting element 14. The loss of the light source light makes the backlight brightness of the backlight module and the display brightness of the display area AA lower.

[0049] On the other hand, Figure 3 As shown, the light bar tape 13 in the related art includes a transparent film layer 131, a second black ink layer 132 located above the transparent film layer 131, a second white ink layer 133 located below the transparent film layer 131, and an adhesive 134 located on both sides of the second black ink layer 132 and the second white ink layer 133. The second black ink layer 132 in the light bar tape 13 will also absorb the light from the light source in the backlight module, reducing the reflection utilization rate of the light from the light source.

[0050] For example, Figure 3 When the light A output by the light emitting element 14 is conducted inside the light guide plate 8, part of the light A is reflected back on the upper surface of the light guide plate 8 and continues to be conducted inside the light guide plate 8. Meanwhile, another part of the light A, such as the light A1, is refracted and escapes from the upper surface of the light guide plate 8, and the light A1 continues to be conducted inside the adhesive 134.

[0051] During the conduction process in the adhesive 134, part of the light A1 will be reflected back by the second white ink layer 133 when the upper surface of the adhesive 134 contacts the second white ink layer 133, and refracted back into the light guide plate 8 through the lower surface of the adhesive 134 to continue to be conducted and reused. At the same time, another part of the light A1, such as the light A2, will be refracted and escape from the upper surface of the adhesive 134. The light A2 refracts and escapes from the upper surface of the adhesive 134 and penetrates the second white ink layer 133 to obtain the light A3, and then the light A3 will continue to be conducted in the transparent film layer 131.

[0052] During the conduction process in the transparent film layer 131, when the light A3 refracts and escapes from the upper surface of the transparent film layer 131 and contacts the second black ink layer 132, it will be absorbed by the second black ink layer 132, so that it cannot reach the backlight luminous area VA and cannot be used to backlight the display panel, thereby causing the loss of light source light.

[0053] Figure 4 This is a schematic diagram of the structure of a backlight module provided in an embodiment of the present application. Figure 4The backlight module shown includes a spacer 1, a shading glue 2, an upper prism 3, a lower prism 4, a diffuser 5, a black strip 6, a first black ink layer 71, a first white ink layer 72, a light guide plate 8, a reflective sheet 9, an iron frame 10, a glue frame 11, a light bar 12, a light bar tape 13, and a light-emitting element 14, wherein the first black ink layer 71 is adjacent to the diffuser 5, and the first white ink layer 72 is adjacent to the light guide plate 8.

[0054] From the structural perspective of the backlight module, compared with the related art, the embodiment of the present application adds a first white ink layer 72 to increase the reflection of light, and the functions of other components are not repeated here.

[0055] Specifically, in the embodiments of the present application, Figure 5 As shown, Figure 5 for Figure 4 The schematic diagram of the partial structure of the backlight module shown in FIG. The backlight module includes a light guide plate 8, a light emitting element 14 arranged on at least one side of the light guide plate 8, a diffuser 5 arranged in the light emitting direction of the light guide plate 8, and a first black ink layer 71 and a first white ink layer 72 arranged between the light guide plate 8 and the diffuser 5 and adjacent to at least one side of the light emitting element 14. The first white ink layer 72 is arranged close to the light guide plate 8.

[0056] By providing the first white ink layer 72, as Figure 5 As shown, when the light B output by the light emitting element 14 is transmitted inside the light guide plate 8, part of the light B is reflected back on the upper surface of the light guide plate 8 and continues to be transmitted inside the light guide plate 8. At the same time, another part of the light B, such as B1, will be refracted and escape from the upper surface of the light guide plate 8 and penetrate the first white ink layer 72.

[0057] Among the light rays penetrating the first white ink layer 72 , the light ray B1 is refracted and escapes from the first white ink layer 72 and is absorbed by the first black ink layer 71 , so that it cannot reach the backlight luminous area VA and cannot be used to backlight the display panel, thereby causing light loss of the light source.

[0058] In summary, the added first white ink layer 72 adds a layer of reflection for light. By increasing the reflection of light through the first white ink layer 72, the light energy absorbed by the first black ink layer 71 is reduced, thereby reducing the light loss on the light path from the light emitting element 14 to the backlight luminous area VA, so that more light can be projected into the backlight luminous area VA, thereby improving the brightness of the backlight module. Exemplarily, in a certain group of specific embodiments, compared with the solution without setting the first white ink layer 72, the embodiment of the present application sets the first white ink layer 72, and it is verified through experiments that it can increase the backlight brightness of the backlight module by 5% to 8%, and the brightness improvement effect is more obvious.

[0059] The embodiment of the present application achieves the purpose of improving brightness by setting a first white ink layer 72, which will neither cause an increase in the power consumption of the backlight module nor an increase in the thickness of the backlight module, that is, it will not affect the endurance of the device and the thinness requirements. At the same time, the cost increase caused by adding only one layer of the first white ink layer 72 is almost negligible, but the brightness improvement effect is more obvious. Correspondingly, according to the solution provided in the embodiment of the present application, the target brightness value can be achieved even when using a lower brightness film material, thereby reducing costs.

[0060] The first black ink layer 71 and the first white ink layer 72 may be formed on the corresponding surface of the diffusion sheet 5 or the light guide plate 8 by silk screen printing, or by other methods. Figure 6 to Figure 8 A schematic diagram of the positions for forming a first black ink layer and a first white ink layer is provided.

[0061] For example, in some embodiments, Figure 6 As shown, the diffuser 5 sequentially forms the above-mentioned first black ink layer 71 and first white ink layer 72 on the surface adjacent to the light guide plate 8. For example, a silk screen printing method can be used as an example, that is, a first black ink layer 71 is firstly silk-screened on the surface of the diffuser 5, and then a first white ink layer 72 is silk-screened on this basis, and then the side of the diffuser 5 with the first black ink layer 71 and the first white ink layer 72 silk-screened is placed in the light emitting direction of the light guide plate 8 to further evenly scatter the light.

[0062] Or, in some embodiments, Figure 7 As shown, the light guide plate 8 forms a first white ink layer 72 and a first black ink layer 71 in sequence on the surface adjacent to the diffuser 5. For example, a silk screen printing method can be used as an example, that is, a first white ink layer 72 is first silk-screened in the light-emitting direction of the light guide plate 8, and then a first black ink layer 71 is silk-screened on this basis, and then the diffuser 5 is placed in the light-emitting direction of the light guide plate 8 and covers the first black ink layer 71.

[0063] Alternatively, in some embodiments, Figure 8 As shown, the first black ink layer 71 is formed on the diffuser 5, and the first white ink layer 72 is formed on the light guide plate 8. For example, the first white ink layer 72 can be screen-printed in the light-emitting direction of the light guide plate 8 by screen printing, and then the diffuser 5 with the first black ink layer 71 screen-printed on the side thereof is placed on the light guide plate 8, and the first black ink layer 71 covers the first white ink layer 72.

[0064] In addition, in order to ensure the display effect of the lamp position, in some embodiments, such as Figure 5As shown, the first black ink layer 71 is closer to the edge of the backlight emitting area VA than the first white ink layer 72. That is, the first black ink layer 71 is not flush with the first white ink layer 72. The outline of the first black ink layer 71 exceeds the first white ink layer 72.

[0065] In the embodiment of the present application, through the above technical solution, on the one hand, the first black ink layer 71 is provided to have a significant technical effect, otherwise the lamp holder position will be too bright, and light spots or firefly effects may appear. Through the provision of the first black ink layer 71, excess light can be absorbed to improve the display effect at the lamp holder position. On the other hand, if the first black ink layer 71 absorbs light in the optical path from the light emitting element 14, i.e., the light source position, to the lamp holder position, it will cause a large loss of light from the light source, which is not conducive to brightness improvement.

[0066] Therefore, in the embodiment of the present application, a first white ink layer 72 is disposed at a position away from the edge of the backlight light emitting area VA, that is, a region close to the light emitting element 14, to improve the reflection utilization of the light source and reduce the light energy loss, and at the same time, the first black ink layer 71 is used to absorb the excess light near the lamp holder. In this way, the reflection utilization of the light source can be improved, the brightness can be increased, and the display effect at the lamp holder can be ensured.

[0067] For example, Figure 5 As shown, the first black ink layer 71 is at a certain distance from the edge of the backlight luminous area VA. Through this technical solution, on the one hand, the first black ink layer 71 can absorb excess light and improve the poor display effect of the lamp position, such as the light spot or firefly effect caused by the uneven local brightness, and improve the display effect. On the other hand, minimizing the size of the first black ink layer 71 can reduce the light energy absorbed by the first black ink layer 71, so that more light energy can be transmitted to the display area AA for luminous display. In summary, the first black ink layer 71 is at a certain distance from the edge of the backlight luminous area VA, which can minimize the loss of light energy while ensuring the display effect.

[0068] In some embodiments, the first black ink layer 71 exceeds the first white ink layer 72 by a dimension greater than or equal to 0.2 mm. In general, taking the silk-screen ink layer method as an example, the dimension tolerance of the silk-screen ink layer in the process is ±0.1 mm. By setting the dimension requirement that the first black ink layer 71 exceeds the first white ink layer 72 by a dimension greater than or equal to 0.2 mm, even under process errors, the relative position between the two ink layers can be ensured to be that the first black ink layer 71 exceeds the first white ink layer 72.

[0069] The first black ink layer 71 mentioned above can be a gradient type or a non-gradient type. The first white ink layer 72 can be a gradient type or a non-gradient type. The gradient type mentioned here refers to the fact that the silk screen printing technology can produce a gradient effect of color during the printing process. Exemplarily, the first black ink layer 71 can be a gradient type. For example, on the side close to the light-emitting element 14, the first black ink layer 71 is lighter in color to reduce the absorption of light energy; and on the side close to the edge of the backlight luminous area, the first black ink layer 71 is darker in color to improve the display effect at the lamp holder position. Exemplarily, the first white ink layer 72 can be a non-gradient type, that is, the first white ink layer 72 is uniformly white throughout, which increases the reflection of light and improves the brightness.

[0070] In some embodiments, Figure 4 As shown, the light emitting element 14 is fixed on the light bar 12, and the light bar 12 is fixed on the light guide plate 8 through the light bar tape 13. Regarding the structure of the light bar tape 13, as shown in FIG. Fig. 9 As shown, Fig. 9 for Figure 4 Another partial structural diagram of the backlight module is shown. The light strip tape 13 includes a transparent film layer 131 , second white ink layers 133 located on both sides of the transparent film layer, and an adhesive 134 formed on the outside of the second white ink layer 133 .

[0071] Compared with the related art, the second black ink layer 132 above the transparent film layer 131 in the related art is changed into the second white ink layer 133 in this embodiment, which can further improve the reflection utilization rate of the light source.

[0072] In some embodiments, a white covering layer 120 is formed on the light bar 12 on the same side surface as the light emitting element 14, and the light bar tape 13 is fixedly connected to the white covering layer 120 by an adhesive 134. The white covering layer 120 can also be used to increase the reflection utilization of light and improve the brightness of the display area.

[0073] For example, Fig. 9 As shown, when the light B output by the light emitting element 14 is transmitted inside the light guide plate 8, part of the light B is reflected back on the upper surface of the light guide plate 8 and continues to be reflected, refracted and transmitted inside the light guide plate 8. At the same time, another part of the light B, such as the light B1, will be refracted and escape from the upper surface of the light guide plate 8, and the light B1 will continue to be reflected, refracted and transmitted inside the adhesive 134.

[0074] During the conduction process in the adhesive 134, part of the light B1 will be reflected back by the second white ink layer 133 when the upper surface of the adhesive 134 contacts the second white ink layer 133, and refracted back into the light guide plate 8 through the lower surface of the adhesive 134 to continue to be conducted and reused. At the same time, another part of the light B1, such as the light B2, will be refracted and escape from the upper surface of the adhesive 134. The light B2 refracts and escapes from the upper surface of the adhesive 134 and penetrates the second white ink layer 133, such as the light B3, and then the light B3 will be conducted in the transparent film layer 131.

[0075] During the conduction process in the transparent film layer 131, part of the light B3 is reflected back when the upper surface of the transparent film layer 131 contacts the second white ink layer 133, and finally returns to the light guide plate 8 for continued conduction after layers of refraction, and is reused. At the same time, another part of the light B3, such as the light B4, will be refracted and escape from the upper surface of the transparent film layer 131. The light B4 will be refracted and escape from the upper surface of the transparent film layer 131 and penetrate the second white ink layer 133, such as the light B5, and then the light B5 will continue to be conducted in the adhesive 134.

[0076] During the conduction process in the adhesive 134, part of the light B5 will be reflected back by the white covering layer 120 when the upper surface of the adhesive 134 contacts the white covering layer 120, and finally return to the light guide plate 8 after layers of refraction to continue reflection, refraction and conduction for repeated use.

[0077] In summary, by replacing the second black ink layer 132 in the light strip tape 13 with the second white ink layer 133, the reflection utilization of light can also be increased. By increasing the reflection of light through the second white ink layer 133 and the white covering layer 120, the light energy loss on the optical path from the light emitting element 14 to the backlight luminous area VA is reduced, so that more light can be projected into the backlight luminous area VA, thereby improving the brightness of the backlight module. Exemplarily, in a certain group of specific embodiments, compared with the solution of setting a second black ink layer 132 above the transparent film layer 131 of the light strip tape 13 in the related art, the embodiment of the present application replaces the second black ink layer 132 in the light strip tape 13 with the second white ink layer 133. Through experimental verification, it can increase the backlight brightness of the backlight module by 3% to 5%, and the brightness improvement effect is more obvious.

[0078] The embodiment of the present application achieves the purpose of improving brightness by changing the structure of the tape ink layer above the transparent film layer 131 in the light strip tape 13, which will neither cause an increase in the power consumption of the backlight module nor an increase in the thickness of the backlight module, that is, it will not affect the endurance of the device and the thinness requirements. At the same time, the cost increase caused by only changing the structure of one layer of tape ink layer is almost negligible, but the brightness improvement effect is more obvious. Correspondingly, according to the solution provided in the embodiment of the present application, the target brightness value can be achieved even when using a lower brightness film material, thereby reducing costs.

[0079] In some embodiments, the light guide plate 8 is a polygonal structure, and the light emitting element 14 is disposed on one side or multiple sides of the light guide plate 8 .

[0080] Exemplarily, the light guide plate 8 can be a quadrilateral structure, a hexagonal structure, an arc structure, or a circular structure. The shape selection can be determined based on the light source layout or the required display effect. The polygonal structure of the light guide plate 8 can adapt to a more compact backlight module design, especially in applications requiring side light emission, which can reduce the overall size of the backlight module.

[0081] For example, Fig.10 As shown, Fig.10 A schematic diagram of a partial structure of another backlight assembly provided in an embodiment of the present application. In some embodiments, as Fig.10 As shown, the light guide plate 8 is a quadrilateral structure, and the light emitting element 14 is arranged on one side surface or two opposite side surfaces of the light guide plate 8 .

[0082] By arranging the light emitting elements 14 on two opposite sides of the light guide plate 8, it is possible to adapt to various display configurations and improve display brightness and uniformity. For example, in a long light emitting area, by adjusting the light emitting elements 14 on both sides of the light emitting area, it is possible to ensure that the brightness on both sides of the light emitting area is relatively uniform, thereby improving the light emitting effect of the entire light emitting area.

[0083] The application scenarios of the embodiments of the present application include but are not limited to single-sided or multi-sided luminous scenarios. At present, most small and medium-sized products or mobile devices, such as wearable devices, mobile phones, tablets, notebooks and monitors, are single-sided luminous. In this case, the light-emitting element 14 can be set on one side of the light guide plate 8. In some large-sized products or multi-sided luminous design products, or in other words, design products with multiple light strips 12, such as large-sized monitors and large-sized TVs, the light-emitting element 14 can be set on two opposite sides of the light guide plate 8. In this case, the backlight module solution provided in the embodiments of the present application can also be applied.

[0084] In a second aspect, an embodiment of the present application provides a display device 300, such as Fig.11 As shown, Fig.11This is a structural schematic diagram of a display device provided in an embodiment of the present application. The display device 300 includes the backlight module 100 mentioned in any embodiment of the first aspect above, and a liquid crystal display panel 200 located in the light emitting direction of the backlight module 100.

[0085] The light from the backlight module 100 passes through the liquid crystal display panel 200 to form the interface required by the user. Since the reflection utilization rate of the light source light in the backlight module 100 is improved, the light transmitted through the liquid crystal display panel 200 is increased when other conditions remain unchanged, and finally the display brightness of the display device 300 is improved. Correspondingly, the backlight module 100 can also achieve the target brightness value when using low-brightness film materials, thereby reducing costs.

[0086] In a third aspect, the present application embodiment further provides an electronic device 400, such as Fig.12 As shown, Fig.12 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application, wherein the electronic device 400 includes the display device 300 mentioned in the second aspect. The electronic device 400 has the same beneficial effects as the display device 300, which will not be described in detail here.

[0087] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that a person skilled in the art can think of within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A backlight module, characterized in that: include: Light guide plate; A light emitting element disposed on at least one side of the light guide plate; A diffusion sheet arranged in the light emitting direction of the light guide plate; A first black ink layer and a first white ink layer of the light emitting element are disposed between the light guide plate and the diffusion sheet and adjacent to the at least one side surface, wherein the first white ink layer is disposed close to the light guide plate.

2. The backlight module according to claim 1, characterized in that: The diffusion sheet sequentially forms the first black ink layer and the first white ink layer on a surface adjacent to the light guide plate.

3. The backlight module according to claim 2, characterized in that: The first black ink layer is closer to the edge of the backlight emission area than the first white ink layer.

4. The backlight module according to claim 3, characterized in that: The dimension of the first black ink layer exceeding the first white ink layer is greater than or equal to 0.2 mm.

5. The backlight module according to claim 1, characterized in that: The light guide plate sequentially forms the first white ink layer and the first black ink layer on a surface adjacent to the diffusion sheet.

6. The backlight module according to claim 1, characterized in that: The first black ink layer is formed on the diffusion sheet, and the first white ink layer is formed on the light guide plate.

7. The backlight module according to any one of claims 1 to 6, characterized in that: The light emitting element is fixed on a light bar, and the light bar is fixed on the light guide plate by a light bar tape, and the light bar tape includes: Transparent film layer; A second white ink layer located on both sides of the transparent film layer; An adhesive is formed on the outside of the second white ink layer.

8. The backlight module according to claim 7, characterized in that: A white covering layer is formed on the light bar on the same side surface as the light emitting element, and the light bar tape is fixedly connected to the white covering layer by the adhesive.

9. The backlight module according to any one of claims 1 to 6, characterized in that: The light guide plate is a polygonal structure, and the light emitting element is arranged on one side or multiple side surfaces of the light guide plate.

10. The backlight module according to claim 9, characterized in that: The light guide plate is a quadrilateral structure, and the light emitting element is arranged on one side surface or two opposite side surfaces of the light guide plate.

11. A display device, characterized in that: It comprises the backlight module as claimed in any one of claims 1 to 10, and a liquid crystal display panel located in the light emitting direction of the backlight module.

12. An electronic device, characterized in that: Includes the display device according to claim 11.

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