Backlight module and display device

Abstract

According to the backlight module and the display device, a middle frame comprises a first supporting sub-part and a second supporting sub-part, the first supporting sub-part is arranged on the side, away from a bottom plate, of an optical film, and the orthographic projection of the first supporting sub-part on a reference plane overlaps the orthographic projection of the optical film on the reference plane; the second supporting sub-part is arranged on the side, away from the bottom plate, of the side plate, and the light transmittance of the first supporting sub-part is larger than that of the second supporting sub-part, so that when the display device is watched at the side view angle, light can be diffused from the first supporting sub-part, and display abnormity caused by missing of display content at the edge of the display device at the side view angle is avoided; and the yield of the display device is improved.

Description

Technical Field

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

[0002] With the development of display technology, the requirements for narrow bezels of display devices are getting higher and higher, and it is necessary to maintain display quality while achieving narrow bezels. An important evaluation criterion in existing display devices is Miss line (i.e., line missing). The test method of Miss line is: keep the observation position different, and measure the angle from the observation position to the edge position of the display device. During the test, the smaller the angle from the observation position to the edge position of the display device, the better the Miss line indicator is, and the better the performance of the display device. However, in the actual preparation process, it is found that the narrower the bezel, the more difficult it is to optimize the Miss line, which often leads to the lack of display content at the edge when viewed from the side.

[0003] Therefore, existing display devices have a technical problem in which display content is missing at the lower edge when viewed from a side angle, resulting in display abnormality. Summary of the Invention

[0004] The embodiments of the present application provide a backlight module and a display device to alleviate the technical problem of display abnormality caused by missing display content at the lower edge of the existing display device when viewed from a side angle.

[0005] In order to achieve the above-mentioned object, according to a first aspect of the present application, a backlight module is provided, comprising:

[0006] A back plate, comprising a bottom plate and side plates, wherein the bottom plate and the side plates form an accommodating space;

[0007] An optical film is disposed in the accommodating space;

[0008] a middle frame, comprising a supporting portion, the supporting portion comprising a first supporting sub-portion and a second supporting sub-portion, the first supporting sub-portion being disposed on a side of the optical film away from the bottom plate, the orthographic projection of the first supporting sub-portion on the reference plane overlapping the orthographic projection of the optical film on the reference plane, and the second supporting sub-portion being disposed on a side of the side plate away from the bottom plate;

[0009] The light transmittance of the first supporting sub-part is greater than the light transmittance of the second supporting sub-part, and the reference plane is perpendicular to the thickness direction of the backlight module.

[0010] According to a second aspect of the present application, a display device is provided, comprising:

[0011] The backlight module as described in any of the above embodiments;

[0012] An adhesive layer is provided on a side of the middle frame away from the back plate;

[0013] The display panel is arranged on a side of the adhesive layer away from the backlight module.

[0014] An embodiment of the present application provides a backlight module and a display device, wherein the backlight module comprises a first supporting sub-section and a second supporting sub-section in a middle frame, wherein the first supporting sub-section is arranged on a side of the optical film away from the bottom plate, and the orthographic projection of the first supporting sub-section on the reference plane overlaps with the orthographic projection of the optical film on the reference plane, and the second supporting sub-section is arranged on a side of the side plate away from the bottom plate, and the transmittance of the first supporting sub-section is greater than the transmittance of the second supporting sub-section, so that when the display device is viewed at a side viewing angle, light can diverge from the first supporting sub-section, thereby avoiding display abnormality caused by missing display content at the edge of the display device at a side viewing angle, thereby improving the yield of the display device.

[0015] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] To more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present application. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0017] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings, wherein the same drawing numbers represent the same parts in the following description.

[0018] Figure 1 This is a schematic diagram of the Missline evaluation method provided in the embodiments of the present application.

[0019] Figure 2 A schematic diagram of a comparative display device provided in an embodiment of the present application.

[0020] Figure 3 This is a first schematic diagram of a backlight module provided in an embodiment of the present application.

[0021] Figure 4 This is a second schematic diagram of the backlight module provided in an embodiment of the present application.

[0022] Figure 5 A schematic diagram of the first supporting sub-section provided in an embodiment of the present application.

[0023] Figure 6 A schematic diagram of the middle frame provided in an embodiment of the present application.

[0024] Figure 7 A schematic diagram of a display device provided by an embodiment of the present application. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort are within the protection scope of the present application.

[0026] In order to explain the principle of the technical problem in the embodiments of the present application, a comparative display device is provided. It can be understood that the comparative display device cannot be used as prior art in the embodiments of the present application. As shown in Figure 1 The test method and evaluation standard of the Miss line are explained, from Figure 1 It can be seen from FIG. 1 that when the comparative display device 11 is observed from the observation position a, the distance between the observation position a and the comparative display device 11 is b, and the angle from the observation position a to the edge position of the comparative display device 11 is c. The evaluation standard of the Miss line is that the angle c from the observation position a to the edge position of the comparative display device 11 is smaller, provided that the distance b between the observation position a and the comparative display device 11 is kept unchanged. However, in the actual design process, it is found that the narrower the frame is, the more difficult it is to optimize the Miss line, and it is often easy to cause the display content to be missing under the side viewing angle, and the principle is described as follows.

[0027] As shown in Figure 2 The comparative display device includes a back plate layer 111, a light source 115, a reflection layer 116, a light guide layer 117, an optical film layer 118, a middle frame layer 112, a glue layer 113 and a display layer 114. The display layer 114 includes a display area 114b and a non-display area 114a. From Figure 2It can be seen that, to reduce the frame, it is necessary to reduce the width of the non-display area 114a and increase the width of the display area 114b. However, the middle frame layer 112 needs to bear the display layer 114 and needs to press the optical film sheet and the light guide plate to play a fixing role. Therefore, the smaller width of the middle frame layer 112 often leads to the optical film sheet and the light guide plate not being pressed and easily falling off. Therefore, when reducing the non-display area 114a of the display layer 114, the width of the middle frame layer 112 cannot be reduced synchronously, and the middle frame layer is generally formed of light shielding material and cannot transmit light, resulting in that the edge display loss of the contrast display device is more serious under the side viewing angle, and the Missline index is worse. Therefore, the existing display device has the technical problem of display abnormality caused by edge display content loss under the side viewing angle. And the narrower the frame is, the more serious the edge display content loss is.

[0028] Embodiments of the present application are directed to the above technical problems, and provide a backlight module and a display device to alleviate the above technical problems.

[0029] Figure 3 A first schematic diagram of the backlight module provided by the embodiments of the present application. Figure 4 A second schematic diagram of the backlight module provided by the embodiments of the present application. Figure 5 A schematic diagram of the first support subpart provided by the embodiments of the present application. Figure 6 A schematic diagram of the middle frame provided by the embodiments of the present application. Figure 7 A schematic diagram of the display device provided by the embodiments of the present application.

[0030] As shown in the drawings, Figures 3 to 6 The embodiments of the present application provide a backlight module, which comprises a back plate 21, an optical film sheet 23 and a middle frame 22. The back plate 21 comprises a bottom plate 211 and a side plate 212, and the bottom plate 211 and the side plate 212 form a containing space 26. The optical film sheet 23 is arranged in the containing space 26. The middle frame 22 comprises a support part 221, and the support part 221 comprises a first support subpart 31 and a second support subpart 32. The first support subpart 31 is arranged on a side of the optical film sheet 23 away from the bottom plate 211. The normal projection of the first support subpart 31 on a reference plane overlaps the normal projection of the optical film sheet 23 on the reference plane. The second support subpart 32 is arranged on a side of the side plate 212 away from the bottom plate 211.

[0031] The light transmittance of the first support subpart 31 is greater than that of the second support subpart, and the reference plane is perpendicular to the thickness direction of the backlight module 2.

[0032] An embodiment of the present application provides a backlight module, which includes a first supporting sub-portion 31 and a second supporting sub-portion 32 in the middle frame 22. The first supporting sub-portion 31 is arranged on the side of the optical film 23 away from the bottom plate 211, and the orthographic projection of the first supporting sub-portion 31 on the reference plane overlaps with the orthographic projection of the optical film 23 on the reference plane. The second supporting sub-portion 32 is arranged on the side of the side plate 212 away from the bottom plate 211. The transmittance of the first supporting sub-portion 31 is greater than the transmittance of the second supporting sub-portion 32, so that when the display device is viewed at a side viewing angle, light can diverge from the first supporting sub-portion 31, avoiding display abnormality caused by missing display content at the edge of the display device at a side viewing angle, thereby improving the yield of the display device.

[0033] Specifically, the reference plane may be the plane where the bottom plate 211 is located, or may be the plane where the light guide plate and the reflective sheet are located.

[0034] Specifically, it can be understood that in the comparative display device, all parts of the middle frame layer are opaque, and the portion of the middle frame layer corresponding to the optical film layer is also opaque. When light emitted by the light source is dispersed to the region of the middle frame layer corresponding to the optical film layer, the light is blocked by the middle frame layer and cannot be dispersed. When viewed from a side angle, only the light-blocking middle frame layer is visible, and the light in the region of the middle frame layer corresponding to the optical film layer cannot be seen, resulting in missing display content at the edge of the display device when viewed from a side angle, causing display abnormality. In the embodiment of the present application, because the transmittance of the first supporting sub-portion 31 is greater than the transmittance of the second supporting sub-portion 32, the first supporting sub-portion 31 can transmit light. When viewed from a side angle, the light can be dispersed from the first supporting sub-portion 31, and the light emanating from the region of the middle frame 22 corresponding to the optical film 23 can be seen, thus avoiding missing display content at the edge of the display device, allowing the display device to display normally, and improving the yield rate of the display device.

[0035] In some embodiments, as Figures 3 to 6 As shown, the backlight module 2 further includes a light guide plate 24, which is disposed between the optical film 23 and the bottom plate 211. The light guide plate 24 is disposed beyond the edge of the optical film 23. The orthographic projection of the portion of the light guide plate 24 that exceeds the optical film 23 on the reference plane overlaps with the orthographic projection of the second supporting sub-portion 32 on the reference plane. By making the orthographic projection of the portion of the light guide plate 24 that exceeds the optical film 23 on the reference plane overlap with the orthographic projection of the second supporting sub-portion 32 on the reference plane, the second supporting sub-portion 32 can block light emitted from the portion of the light guide plate 24 that exceeds the optical film 23, thereby improving the display effect.

[0036] Specifically, such as Figures 3 to 6As shown, it can be seen that in order to allow a certain amount of expansion space for the optical film 23, the light guide plate 24 is arranged beyond the edge of the optical film 23. Therefore, the light emitted from the portion of the light guide plate 24 that extends beyond the optical film 23 does not pass through the optical film. This portion of light is different from the light emitted through the optical film. If this portion of light is emitted, it will affect the display effect. Therefore, in this embodiment of the present application, by making the orthographic projection of the portion of the light guide plate 24 that extends beyond the optical film 23 overlap with the orthographic projection of the second support sub-section 32 on the reference plane, the second support sub-section 32 can block the light emitted from the portion of the light guide plate 24 that extends beyond the optical film 23, thereby improving the display effect.

[0037] In some embodiments, as Figure 3 As shown, the orthographic projection of the interface between the second supporting sub-section 32 and the first supporting sub-section 31 on the reference plane coincides with the orthographic projection of the edge of the optical film 23 on the reference plane. By aligning the orthographic projection of the interface between the second supporting sub-section 32 and the first supporting sub-section 31 on the reference plane with the orthographic projection of the edge of the optical film 23 on the reference plane, light emitted from the optical film 23 can be emitted from the first supporting sub-section 31, while light emitted from the portion of the light guide plate 24 that extends beyond the optical film 23 is blocked by the second supporting sub-section 32. This prevents display abnormalities caused by missing display content at the edge of the display device when viewed from a side angle, while also preventing light emitted from the portion of the light guide plate 24 that extends beyond the optical film 23 from affecting the display effect.

[0038] Specifically, when setting the first supporting sub-section 31, the interface between the first supporting sub-section 31 and the second supporting sub-section 32 can be located within the orthographic projection range of the optical film 23 on the reference plane. Specifically, the orthographic projection of the interface between the second supporting sub-section 32 and the first supporting sub-section 31 on the reference plane can coincide with the orthographic projection of the edge of the optical film 23 on the reference plane.

[0039] Specifically, when setting the first supporting sub-section 31, the interface between the first supporting sub-section 31 and the second supporting sub-section 32 can also be located within the positive projection range of the reference plane of the portion of the light guide plate 24 that extends beyond the optical film 23, thereby increasing the amount of light diverging from the first supporting sub-section 31, avoiding display abnormalities caused by missing display content at the edge of the display device at a side viewing angle, and improving the yield of the display device.

[0040] In some embodiments, as Figure 3As shown, the first supporting sub-section 31 includes a connecting portion 312 and an abutting portion 311. The abutting portion 311 is connected to the second supporting sub-section 32 via the connecting portion 312. The thickness L1 of the abutting portion 311 is greater than the thickness L2 of the connecting portion 312. By having the first supporting sub-section 31 include the connecting portion 312 and the abutting portion 311, the adhesive will not shift above the optical film and block it during the subsequent bonding process between the backlight module and the display panel, thereby improving the yield of the backlight module.

[0041] Specifically, when setting the middle frame 22, the middle frame 22 will be bonded to the display panel through the adhesive. During the bonding process of the adhesive, the adhesive may be offset. In order to prevent the adhesive from offsetting onto the optical film and causing abnormal light emission of the backlight module, the first supporting sub-portion 31 can include an abutting portion 311, and the thickness of the abutting portion 311 is greater than the thickness of the connecting portion 312, so that when the adhesive is offset, it will be blocked by the abutting portion 311, thereby improving the yield of the backlight module.

[0042] Specifically, the first supporting sub-portion 31 includes a contact portion 311 and a connecting portion 312, so that the area of ​​the first supporting sub-portion 31 is relatively large, and light can be diverged from the contact portion 311 and the connecting portion 312, thereby avoiding missing display content at the edge of the display device, allowing the display device to display normally, and improving the yield of the display device.

[0043] Specifically, it can be understood that when the supporting portion 221 includes two parts of different thicknesses, the two parts of different thicknesses may be arranged corresponding to the optical film 23. At this time, the two parts of different thicknesses can both be the first supporting sub-parts, that is, the first supporting sub-part includes the abutting part 311 and the connecting part 312, so that the light emitted from the optical film can pass through the first supporting sub-part.

[0044] Specifically, the boundary line between the first supporting sub-section and the second supporting sub-section can be aligned with the edge of the optical film, or the boundary line between the first supporting sub-section and the second supporting sub-section can be located within the orthographic projection range of the optical film, or the edge of the optical film can be located within the orthographic projection range of the first supporting sub-section.

[0045] In some embodiments, as Figure 3 、 Figure 5As shown, the roughness of the surface of the abutting portion 311 away from the optical film 23 (i.e., the first surface 311a) is greater than the roughness of the surface 32a of the second supporting sub-portion 32. By making the roughness of the surface 311a of the abutting portion 311 away from the optical film 23 greater than the roughness of the surface 32a of the second supporting sub-portion 32, the abutting portion 311 can diffuse the light after it hits the abutting portion 311, preventing the light from being reflected back when it hits the upper surface of the abutting portion 311, resulting in a malfunction of the display. This prevents missing display content at the edge of the display device, ensures normal display of the display device, and improves the yield rate of the display device.

[0046] Specifically, after the light is diverged into the abutment portion 311, the surface of the abutment portion 311 on the side away from the optical film 23 (i.e., the first surface 311a) has a greater roughness, so that the light will not be mirror-reflected on the surface of the abutment portion 311 on the side away from the optical film 23 (i.e., the first surface 311a). The abutment portion 311 can diverge the light, avoid missing display content at the edge of the display device, enable the display device to display normally, and improve the yield of the display device.

[0047] Specifically, when the roughness of the surface of the side of the abutting portion 311 away from the optical film 23 (i.e., the first surface 311a) is greater than the roughness of the surface 32a of the second supporting sub-portion, the surface of the side of the abutting portion 311 away from the optical film 23 can be formed into an uneven pattern, or the surface of the side of the abutting portion 311 away from the optical film 23 (i.e., the first surface 311a) can be formed into an irregular pattern.

[0048] Specifically, the above embodiment is described by taking the example that the roughness of the surface of the side of the abutting portion 311 away from the optical film 23 is greater than the roughness of the surface of the second supporting sub-portion 32, but the embodiments of the present application are not limited to this. The roughness of the surface of the side of the abutting portion 311 away from the optical film 23 can be less than or equal to the roughness of the surface of the second supporting sub-portion 32.

[0049] In some embodiments, as Figure 3 、 Figure 5As shown, the roughness of the surface of the abutting portion 311 away from the second supporting sub-portion 32 (i.e., the second surface 311b and the third surface 311c) is greater than the roughness of the surface 32a of the second supporting sub-portion 32. By making the roughness of the surface of the abutting portion 311 away from the second supporting sub-portion 32 (i.e., the second surface 311b and the third surface 311c) greater than the roughness of the surface 32a of the second supporting sub-portion 32, the abutting portion 311 can diffuse the light after it hits the abutting portion 311, preventing the light from being reflected back when it hits the side of the abutting portion 311, resulting in a non-perfect display. This prevents missing display content at the edge of the display device, ensures normal display of the display device, and improves the yield rate of the display device.

[0050] Specifically, after the light is diverged into the abutment portion 311, the surface of the abutment portion 311 on the side away from the second supporting sub-portion 32 (i.e., the second surface 311b and the third surface 311c) is rougher, so that the light will not be mirror-reflected on the surface of the abutment portion 311 on the side away from the second supporting sub-portion 32 (i.e., the second surface 311b and the third surface 311c). The abutment portion 311 can diverge the light, avoid missing display content at the edge of the display device, enable the display device to display normally, and improve the yield of the display device.

[0051] Specifically, when the roughness of the surface of the side of the abutment portion 311 away from the second supporting sub-portion 32 is greater than the surface roughness of the second supporting sub-portion, the surface of the side of the abutment portion 311 away from the second supporting sub-portion 32 can be formed into an uneven pattern, or the surface of the side of the abutment portion 311 away from the second supporting sub-portion 32 can be formed into other irregular patterns.

[0052] Specifically, the above embodiment is described by taking the example that the roughness of the surface of the side of the abutment portion 311 away from the second supporting sub-portion 32 is greater than the roughness of the surface of the second supporting sub-portion 32, but the embodiments of the present application are not limited to this. The roughness of the surface of the side of the abutment portion 311 away from the second supporting sub-portion 32 can be less than or equal to the roughness of the surface of the second supporting sub-portion 32.

[0053] In some embodiments, as Figure 3 、 Figure 5As shown, the roughness of the surface of the abutting portion 311 on the side close to the connecting portion 312 (i.e., the fourth surface 311d and the fifth surface 311e) is less than or equal to the roughness of the surface 32a of the second supporting sub-portion 32. By making the roughness of the surface of the abutting portion 311 on the side close to the connecting portion 312 (i.e., the fourth surface 311d and the fifth surface 311e) less than or equal to the roughness of the surface 32a of the second supporting sub-portion 32, when light strikes the surface of the abutting portion 311 on the side close to the connecting portion 312, it is reflected by the abutting portion 311 to the other side, causing the light to diverge toward one side of the display area, thereby preventing light loss.

[0054] Specifically, it can be understood that the light emitted from the side of the abutment 311 away from the optical film and the side of the abutment 311 away from the second supporting sub-part can be diverged to the display area or viewed by the human eye, while the light emitted toward the side of the abutment 311 close to the connecting part 312 cannot be emitted and will not play a role in the display. Therefore, this light can be reflected by the surface of the side of the abutment 311 close to the connecting part 312 (i.e., the fourth surface 311d and the fifth surface 311e), thereby improving the utilization rate of the light and avoiding the light from diverging toward the edge and causing light leakage. The roughness of the surface of the side of the abutment 311 close to the connecting part 312 (i.e., the fourth surface 311d and the fifth surface 311e) is less than or equal to the roughness of the surface 32a of the second supporting sub-part, and does not need to be processed, thereby reducing the complexity of the process.

[0055] Specifically, the above embodiment is described by taking the example that the roughness of the surface of the side of the abutting part close to the connecting part is less than or equal to the roughness of the surface of the second supporting sub-part, but the embodiment of the present application is not limited to this, and the roughness of the surface of the side of the abutting part close to the connecting part can be greater than the roughness of the surface of the second supporting sub-part.

[0056] In some embodiments, as Figure 3 、 Figure 5As shown, the roughness of the surface of the abutting portion 311 on the side close to the optical film 23 (i.e., the eighth surface 311h) is greater than or equal to the roughness of the surface 32a of the second supporting sub-portion 32. By making the roughness of the surface of the abutting portion 311 on the side close to the optical film 23 (i.e., the eighth surface 311h) greater than or equal to the roughness of the surface 32a of the second supporting sub-portion 32, after light is diverged into the abutting portion 311, the roughness of the surface of the abutting portion 311 on the side close to the optical film (i.e., the eighth surface 311h) is greater. This prevents the light from being specularly reflected on the surface of the abutting portion 311 on the side close to the optical film (i.e., the eighth surface 311h), and allows the light to enter the abutting portion 311 at a divergent angle and diverge. This prevents missing display content at the edge of the display device, allows the display device to display normally, and improves the yield rate of the display device.

[0057] Specifically, when the roughness of the surface of the side of the abutting portion 311 close to the optical film 23 (i.e., the eighth surface 311h) is greater than or equal to the roughness of the surface 32a of the second supporting sub-portion 32, the surface of the side of the abutting portion 311 close to the optical film 23 (i.e., the eighth surface 311h) can be formed into an uneven pattern, or the surface of the side of the abutting portion 311 close to the optical film 23 (i.e., the eighth surface 311h) can be formed into other irregular patterns.

[0058] Specifically, the above embodiment is described by taking the example that the roughness of the surface of the abutting portion 311 on the side close to the optical film 23 is greater than or equal to the roughness of the surface of the second supporting sub-portion 32, but the embodiment of the present application is not limited to this. The roughness of the surface of the abutting portion 311 on the side close to the optical film 23 can be less than the roughness of the surface of the second supporting sub-portion 32.

[0059] In some embodiments, as Figure 3 、 Figure 5 As shown, the roughness of the surface of the connecting portion 312 on the side close to the optical film (i.e., the ninth surface 311i) is greater than or equal to the roughness of the surface 32a of the second supporting sub-portion 32. By making the roughness of the surface of the connecting portion 312 on the side close to the optical film (i.e., the ninth surface 311i) greater than or equal to the roughness of the surface 32a of the second supporting sub-portion 32, after light is diverged into the connecting portion 312, the roughness of the surface of the connecting portion 312 on the side close to the optical film (i.e., the ninth surface 311i) is greater, so that the light does not undergo specular reflection on the surface of the connecting portion 312 on the side close to the optical film (i.e., the ninth surface 311i). The light can enter the connecting portion 312 at a divergent angle and diverge, thereby avoiding missing display content at the edge of the display device, ensuring normal display of the display device, and improving the yield rate of the display device.

[0060] Specifically, when the roughness of the surface of the connecting portion 312 on the side close to the optical film 23 (i.e., the ninth surface 311i) is greater than or equal to the roughness of the surface 32a of the second supporting sub-portion 32, the surface of the connecting portion 312 on the side close to the optical film 23 (i.e., the ninth surface 311i) can be formed into an uneven pattern, or the surface of the connecting portion 312 on the side close to the optical film 23 (i.e., the ninth surface 311i) can be formed into other irregular patterns.

[0061] Specifically, the above embodiment is described by taking the example that the roughness of the surface of the connecting portion 312 close to the optical film 23 is greater than or equal to the roughness of the surface of the second supporting sub-portion 32, but the embodiment of the present application is not limited to this. The roughness of the surface of the connecting portion 312 close to the optical film 23 can be less than the roughness of the surface of the second supporting sub-portion 32.

[0062] In some embodiments, as Figure 3 、 Figure 5 As shown, the roughness of the surface of the connecting portion 312 on the side away from the optical film 23 (i.e., the seventh surface 311g) is less than or equal to the roughness of the surface 32a of the second supporting sub-portion 32. By making the roughness of the surface of the connecting portion 312 on the side away from the optical film 23 (i.e., the seventh surface 311g) less than or equal to the roughness of the surface 32a of the second supporting sub-portion 32, when light is irradiated on the surface of the connecting portion 312 on the side away from the optical film 23 (i.e., the seventh surface 311g), it can be reflected by the connecting portion 312 to other surfaces, causing the light to diverge toward one side of the display area, thereby preventing light loss.

[0063] Specifically, it can be understood that the light emitted from the side of the abutment portion 311 away from the optical film and the side of the abutment portion 311 away from the second supporting sub-portion can be diverged to the display area or viewed by the human eye, while the light emitted toward the surface of the side of the connecting portion 312 away from the optical film 23 (i.e., the seventh surface 311g) may not be emitted and will not play a role in the display. Therefore, this light can be reflected by the surface of the side of the connecting portion 312 away from the optical film 23 (i.e., the seventh surface 311g), thereby improving the utilization rate of the light and avoiding the light from diverging toward the edge and causing light leakage. The roughness of the surface of the side of the connecting portion 312 away from the optical film 23 (i.e., the seventh surface 311g) is less than or equal to the roughness of the surface 32a of the second supporting sub-portion, and does not need to be processed, thereby reducing the process complexity.

[0064] Specifically, the above embodiment is described by taking the example that the roughness of the surface of the connecting portion 312 away from the optical film 23 is less than or equal to the roughness of the surface of the second supporting sub-portion 32, but the embodiments of the present application are not limited to this. The roughness of the surface of the connecting portion 312 away from the optical film 23 can be greater than the roughness of the surface of the second supporting sub-portion 32.

[0065] In some embodiments, as Figure 3 、 Figure 5 As shown, the roughness of the surface of the connecting portion 312 on the side close to the second supporting sub-portion 32 (i.e., the sixth surface 311f) is less than or equal to the roughness of the surface 32a of the second supporting sub-portion 32. By making the roughness of the surface of the connecting portion 312 on the side close to the second supporting sub-portion 32 (i.e., the sixth surface 311f) less than or equal to the roughness of the surface 32a of the second supporting sub-portion 32, light irradiated by the surface of the connecting portion 312 on the side close to the second supporting sub-portion 32 can be reflected by the connecting portion 312 to other surfaces, causing the light to diverge toward one side of the display area, thereby preventing light loss.

[0066] Specifically, it can be understood that the light emitted from the side of the abutment portion 311 away from the optical film and the side of the abutment portion 311 away from the second supporting sub-portion can be diverged to the display area or viewed by the human eye, while the light emitted toward the surface on the side of the connecting portion 312 close to the second supporting sub-portion 32 (i.e., the sixth surface 311f) may not be emitted and will not play a role in the display. Therefore, this light can be reflected by the surface on the side of the connecting portion 312 close to the second supporting sub-portion 32 (i.e., the sixth surface 311f), thereby improving the utilization rate of the light and avoiding the light divergence toward the edge to cause light leakage.

[0067] Specifically, the above embodiment is described by taking the example that the roughness of the surface of the connecting portion 312 on the side close to the second supporting sub-portion 32 is less than or equal to the roughness of the surface of the second supporting sub-portion 32, but the embodiments of the present application are not limited to this. The roughness of the surface of the connecting portion 312 on the side close to the second supporting sub-portion 32 can be greater than the roughness of the surface of the second supporting sub-portion 32.

[0068] Specifically, such as Figure 5As shown, the first supporting sub-portion 31 includes a first surface 311a, a second surface 311b, a third surface 311c, a fourth surface 311d, a fifth surface 311e, a sixth surface 311f, a seventh surface 311g, an eighth surface 311h and a ninth surface 311i. The first surface 311a is the surface of the side of the abutting portion 311 away from the optical film 23, and the second surface 311b and the third surface 311c are the surfaces of the side of the abutting portion 311 away from the second supporting sub-portion 32. The first surface 311a, the second surface 311b and the third surface 311c can be provided with uneven structures or other irregular structures to diffuse the light.

[0069] Specifically, the patterns of the first surface 311 a , the second surface 311 b , and the third surface 311 c may be the same or different.

[0070] Specifically, such as Figure 5 As shown, the fourth surface 311d and the fifth surface 311e constitute the surface of the abutment portion 311 close to the optical film 23, and the ninth surface 311i is the surface of the connection portion 312 close to the optical film. The fourth surface 311d, the fifth surface 311e and the ninth surface 311i can also be provided with uneven structures or other irregular structures to diffuse the light.

[0071] Specifically, such as Figure 5 As shown, the sixth surface 311f, the seventh surface 311g and the eighth surface 311h are respectively the surface of the side of the connecting portion 312 close to the second supporting sub-portion 32, the surface of the side of the connecting portion 312 away from the optical film 23 and the surface of the side of the abutting portion 311 close to the connecting portion 312, so that the sixth surface 311f, the seventh surface 311g and the eighth surface 311h can be relatively flat to reflect light.

[0072] Specifically, since the sixth surface 311f will contact the second supporting sub-portion 32, the sixth surface 311f may be relatively flat and may have greater roughness. In the embodiment of the present application, the sixth surface 311f may not be processed to keep the specific shape formed in the actual preparation process.

[0073] Specifically, such as Figure 3 As shown, the thickness of the connecting portion 312 may be equal to the thickness of the second supporting sub-portion 32 .

[0074] Specifically, such as Figure 3 As shown, the orthographic projections of the abutting portion 311 and the connecting portion 312 overlap with the orthographic projection of the optical film 23 .

[0075] In some embodiments, as Figure 4As shown, the orthographic projection of the first supporting sub-portion 31 on the reference plane overlaps with the orthographic projection of the optical film 23 on the reference plane, and the thickness L3 of the first supporting sub-portion 31 is greater than the thickness L4 of the second supporting sub-portion 32. By ensuring that the orthographic projections of the first supporting sub-portion 31 on the reference plane overlap with the orthographic projections of the optical film 23 on the reference plane and that the thickness of the first supporting sub-portion 31 is greater than the thickness of the second supporting sub-portion, the adhesive will not shift above the optical film and obstruct it during the subsequent bonding process between the backlight module and the display panel, thereby improving the yield of the backlight module.

[0076] Specifically, when setting the middle frame 22, the middle frame 22 will be bonded to the display panel through glue. During the bonding process of the glue, the glue may be offset. In order to prevent the glue from offsetting onto the optical film and causing abnormal light emission of the backlight module, the thickness of the first supporting sub-section 31 can be made greater than the thickness of the second supporting sub-section 32, so that when the glue is offset, it will be blocked by the first supporting sub-section 31, thereby improving the yield of the backlight module.

[0077] Specifically, it can be understood that when the support portion 221 includes two parts of different thicknesses, the two parts of different thicknesses may be arranged corresponding to the optical film 23. At this time, the part with a larger thickness can be made into the first supporting sub-part, so that the light emitted from the optical film can pass through the first supporting sub-part.

[0078] Specifically, the boundary line between the first supporting sub-section and the second supporting sub-section can be aligned with the edge of the optical film, or the boundary line between the first supporting sub-section and the second supporting sub-section can be located within the orthographic projection range of the optical film, or the edge of the optical film can be located within the orthographic projection range of the first supporting sub-section.

[0079] Specifically, when the thickness of the first supporting sub-section is greater than that of the second supporting sub-section, the design of each surface of the first supporting sub-section may refer to the design of the abutting portion and the connecting portion in the first supporting sub-section in the above embodiment.

[0080] In some embodiments, the orthographic projection of the first supporting sub-portion 31 on the reference plane overlaps with the orthographic projection of the optical film 23 on the reference plane, and the thickness of the first supporting sub-portion 31 is equal to the thickness of the second supporting sub-portion 32. When providing a middle frame, the thickness of each portion of the supporting portion of the middle frame can be equal, and in this case, the thickness of the first supporting sub-portion can be equal to the thickness of the second supporting sub-portion.

[0081] Specifically, the base materials of the first supporting sub-section and the second supporting sub-section may be the same material. The difference between the two is that the second supporting sub-section may be doped with black pigment, while the first supporting sub-section does not need to be doped with black pigment.

[0082] Specifically, the material of the first supporting sub-part may be polymethyl methacrylate (PMMA), polycarbonate (PC), and polystyrene (PS). The material of the second supporting sub-part may be polymethyl methacrylate (PMMA), polycarbonate (PC), and polystyrene (PS) doped with black pigment.

[0083] In some embodiments, as Figures 3 to 5 As shown, diffusion particles 33 are provided in the first supporting sub-portion 31. By providing the diffusion particles in the first supporting sub-portion 31, the first supporting sub-portion 31 has a better light diffusion effect, thereby avoiding light loss, avoiding missing display content at the edge of the display device, allowing the display device to display normally, and improving the yield of the display device.

[0084] Specifically, the haze of the first supporting sub-part can be made greater than or equal to 60% by controlling the concentration of the diffusion particles.

[0085] Specifically, the material of the diffusion particles includes at least one of silicon dioxide, titanium dioxide, barium sulfate, calcium carbonate, and zirconium dioxide.

[0086] In some embodiments, the light transmittance of the first supporting sub-portion 31 ranges from 10% to 90%.

[0087] Specifically, the light transmittance of the first supporting sub-portion 31 may be in a range of 20% to 70%.

[0088] Specifically, such as Figure 3 、 Figure 4 As shown, the middle frame 22 further includes a fixing portion 222 , which is connected to the supporting portion 221 . The material of the fixing portion 222 can be the same as that of the second supporting sub-portion 32 .

[0089] Specifically, such as Figure 3 、 Figure 4 As shown, the backlight module 2 further includes a light guide plate 24 , a reflective sheet 25 and a light source. The light guide plate 24 , the reflective sheet 25 and the light source are all disposed in the accommodating space 26 .

[0090] Specifically, the light source can be an edge-type light source or a direct-type light source, that is, the light source can be arranged on the side of the light guide plate close to the side plate 212, or on the side of the reflective sheet 25 away from the bottom plate 211.

[0091] Specifically, the optical film 23 may include a light-homogenizing film 231, a prism sheet 232, and a diffuser 233, but the embodiments of the present application are not limited thereto. For example, the optical film 23 may include a color conversion film, or the optical film 23 may include a lower diffuser, a lower prism sheet, an upper prism sheet, and an upper diffuser.

[0092] Specifically, such as Figure 6 As shown, Figure 6 A dividing line 22a between the first supporting sub-section and the second supporting sub-section is shown.

[0093] Specifically, in the embodiment of the present application, the middle frame may directly contact the optical film, or may be spaced a certain distance apart from the optical film.

[0094] Specifically, in the embodiment of the present application, the light guide plate may directly contact the optical film or may be spaced apart from the optical film. The light guide plate may directly contact the reflective sheet or may be spaced apart from the reflective sheet.

[0095] Specifically, in the embodiment of the present application, the reflective sheet may be in direct contact with the back plate, or may be spaced a certain distance apart from the back plate.

[0096] Specifically, the middle frame in the embodiment of the present application can be formed by a double-material injection molding process.

[0097] At the same time, an embodiment of the present application provides a display device, which includes the backlight module as described in any of the above embodiments.

[0098] Specifically, such as Figure 7 As shown, the display device 3 includes a backlight module, an adhesive layer 42 and a display panel 41 . The adhesive layer 42 is arranged on a side of the middle frame 22 away from the back plate 21 , and the display panel 41 is arranged on a side of the adhesive layer 42 away from the backlight module 2 .

[0099] Specifically, the adhesive layer 42 may be foam adhesive.

[0100] In some embodiments, as Figure 7 As shown, the width H1 of the portion of the first supporting sub-portion 31 in contact with the adhesive layer 42 is less than or equal to half the width H2 of the adhesive layer. By ensuring that the width of the portion of the first supporting sub-portion 31 in contact with the adhesive layer 42 is less than or equal to half the width of the adhesive layer, the width of the light-transmitting portion of the middle frame is prevented from being too large, which could cause light to leak out of the edge of the display device. This prevents light leakage from the display device and improves the yield of the display panel.

[0101] In some embodiments, the display panel 41 includes a light-shielding portion 412 and a light-transmitting portion 411, and the orthographic projection of the first supporting sub-portion 31 on the reference plane is located within the orthographic projection of the light-shielding portion 412 on the reference plane. By making the orthographic projection of the first supporting sub-portion 31 on the reference plane located within the orthographic projection of the light-shielding portion 412 on the reference plane, there is no need to change the size of the light-shielding portion 412 and the light-transmitting portion 411 of the display panel 41. By making the first supporting sub-portion light-transmitting, it can be achieved that when viewing the display device at a side viewing angle, light can be diverged from the first supporting sub-portion, thereby avoiding display abnormalities caused by missing display content at the edge of the display device at a side viewing angle, thereby improving the yield of the display device.

[0102] Specifically, the light shielding part 412 of the display panel 41 refers to an area that cannot transmit light, and a film layer such as a black matrix can be arranged in the area. The light transmitting part 411 refers to an area that can transmit light, and a film layer such as a color resist and a black matrix between color resists can be arranged in the area.

[0103] Specifically, the display device can further include a polaroid and a cover plate.

[0104] Specifically, the above embodiments have described the backlight module and the display device in detail from the aspects of the film layer design of the backlight module and the display device, the positional relationship of each film layer, and the like. It can be understood that, when there is no conflict between the embodiments, the embodiments can be combined, for example, the first support subpart includes a connecting part and an abutting part, the abutting part is connected with the second support subpart through the connecting part, the thickness of the abutting part is greater than the thickness of the connecting part, and the light transmittance of the first support subpart ranges from 20% to 70%.

[0105] In the description of the present application, the terms "first", "second" are only used for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0106] In the above embodiments, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0107] The embodiments, implementation manners and related technical features of the present application can be combined or replaced with each other without conflict.

[0108] The above is only the preferred embodiment of the present application, and does not limit the present application in any form. Any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application, without departing from the technical solution of the present application, still belongs to the scope of the technical solution of the present application.

Claims

1. A backlight module, characterized in that: include: A back plate, comprising a bottom plate and side plates, wherein the bottom plate and the side plates form an accommodating space; An optical film is disposed in the accommodating space; a middle frame, comprising a supporting portion, the supporting portion comprising a first supporting sub-portion and a second supporting sub-portion, the first supporting sub-portion being disposed on a side of the optical film away from the bottom plate, the orthographic projection of the first supporting sub-portion on the reference plane overlapping the orthographic projection of the optical film on the reference plane, and the second supporting sub-portion being disposed on a side of the side plate away from the bottom plate; The light transmittance of the first supporting sub-part is greater than the light transmittance of the second supporting sub-part, and the reference plane is perpendicular to the thickness direction of the backlight module.

2. The backlight module according to claim 1, wherein: The backlight module also includes a light guide plate, which is arranged between the optical film and the base plate. The light guide plate is arranged beyond the edge of the optical film, and the orthographic projection of the part of the light guide plate that exceeds the optical film on the reference plane overlaps with the orthographic projection of the second supporting sub-part on the reference plane.

3. The backlight module according to claim 2, wherein: The orthographic projection of the interface between the second supporting sub-part and the first supporting sub-part on the reference plane coincides with the orthographic projection of the edge of the optical film on the reference plane.

4. The backlight module according to claim 1, wherein: The first supporting sub-section includes a connecting portion and an abutting portion. The abutting portion is connected to the second supporting sub-section via the connecting portion. The thickness of the abutting portion is greater than that of the connecting portion.

5. The backlight module according to claim 4, wherein: The roughness of the surface of the abutting portion away from the optical film is greater than the roughness of the surface of the second supporting sub-portion; the roughness of the surface of the abutting portion away from the second supporting sub-portion is greater than the roughness of the surface of the second supporting sub-portion.

6. The backlight module according to claim 5, wherein: The roughness of a surface of the abutting portion on a side close to the connecting portion is smaller than the roughness of a surface of the second supporting sub-portion.

7. The backlight module according to claim 4, wherein: The roughness of the surface of the abutting portion close to the optical film is greater than or equal to the roughness of the surface of the second supporting sub-portion, and the roughness of the surface of the connecting portion close to the optical film is greater than or equal to the roughness of the surface of the second supporting sub-portion.

8. The backlight module according to claim 4, wherein: The roughness of the surface of the connecting portion away from the optical film is less than or equal to the roughness of the surface of the second supporting sub-portion, and the roughness of the surface of the connecting portion close to the second supporting sub-portion is less than or equal to the roughness of the surface of the second supporting sub-portion.

9. The backlight module according to claim 1, wherein: The thickness of the first supporting sub-portion is greater than the thickness of the second supporting sub-portion.

10. The backlight module according to any one of claims 1 to 9, characterized in that: Diffusion particles are arranged in the first supporting sub-part.

11. The backlight module according to any one of claims 1 to 9, characterized in that: The light transmittance of the first supporting sub-part ranges from 20% to 70%.

12. A display device, characterized in that: include: The backlight module according to any one of claims 1 to 11; An adhesive layer is provided on a side of the middle frame away from the back plate; The display panel is arranged on a side of the adhesive layer away from the backlight module.

13. The display device according to claim 12, wherein: A width of a portion of the first supporting sub-portion in contact with the adhesive layer is less than or equal to half of a width of the adhesive layer.

14. The display device according to claim 13, wherein: The display panel includes a light-shielding portion and a light-transmitting portion, and an orthographic projection of the first supporting sub-portion on a reference plane is located within an orthographic projection of the light-shielding portion on the reference plane.

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