Backlight module, terminal device and assembling method thereof

Abstract

The application provides a backlight module, a terminal device and an assembling method thereof, and belongs to the technical field of display. The backlight module comprises a light source and a light guide plate. The light emitting surface of the light source faces the side surface of the light guide plate. The light guide plate has a central region and an edge region located at the periphery of the central region. The density of first mesh points distributed at a first position in the edge region is less than the density of second mesh points distributed at a position adjacent to the first position in the central region. The first position is any position in the edge region. The thickness of an edge display part is less than the thickness of a central display part. In the light guide plate, the density of the first mesh points in the edge region is less than the density of the second mesh points in the central region, so that the brightness of the edge display part of the liquid crystal display panel is lower than the brightness of the central display part. Therefore, the brightness difference caused by the fact that the thickness of the edge display part of the liquid crystal display panel is less than the thickness of the central display part can be compensated, and the display effect of the liquid crystal display panel is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to a backlight module, a terminal device and an assembling method thereof. BACKGROUND

[0002] At present, terminal devices have become indispensable electronic products in people's life. Various terminal devices such as mobile phones, tablet computers and notebook computers greatly increase the convenience of people's life.

[0003] Generally, a terminal device can include a liquid crystal display screen and a middle frame. The middle frame can be connected with the back of the liquid crystal display screen. At present, the liquid crystal display screen and the middle frame are generally bonded by dispensing, and in order to ensure the effectiveness of the bonding between the liquid crystal display screen and the middle frame, the bonded liquid crystal display screen and the middle frame need to be pressed.

[0004] However, after the bonded liquid crystal display screen and the middle frame are pressed, the brightness at the edge position of the liquid crystal display screen can be higher than the brightness at the central position, resulting in poor display effect of the liquid crystal display screen. SUMMARY

[0005] The present application provides a backlight module, a terminal device and an assembling method thereof, which improves the display effect of the liquid crystal display screen. The technical solution is as follows:

[0006] On the one hand, a backlight module is provided, comprising: a light source and a light guide plate;

[0007] The light emitting surface of the light source faces the side surface of the light guide plate;

[0008] The light guide plate has a central region and an edge region located at the periphery of the central region, a plurality of first dots are arranged in the edge region, a plurality of second dots are arranged in the central region, the density of the first dots distributed at a first position in the edge region is less than the density of the second dots distributed at a position adjacent to the first position in the central region, and the first position is any position in the edge region;

[0009] Among the light rays emitted by the light source, the light rays reflected by the plurality of first dots are used to shoot at the edge display part of the liquid crystal display panel, and the light rays reflected by the plurality of second dots are used to shoot at the central display part of the liquid crystal display panel, and the thickness of the edge display part is less than the thickness of the central display part.

[0010] Optionally, the density of the first dots distributed at each position in the edge region gradually increases along the direction close to the central region.

[0011] Optionally, the density of the second dots distributed at the second position in the central region is positively correlated with the horizontal distance between the light emitting surface of the light source and the second position, and the second position is any position in the central region.

[0012] Optionally, the width of the edge region ranges from 4mm to 6mm.

[0013] Optionally, the plurality of first dots and the plurality of second dots are distributed on the same plate surface of the light guide plate.

[0014] Optionally, the backlight module further comprises a frame, a reflective sheet and an optical film sheet.

[0015] The light source, the light guide plate, the reflective sheet and the optical film sheet are all located in the frame, and the optical film sheet is located on the side of the light guide plate opposite to the plate surface on which the plurality of first dots are arranged, and the reflective sheet is located on the side of the light guide plate away from the optical film sheet.

[0016] In another aspect, a terminal device is provided, comprising a middle frame and a liquid crystal display screen.

[0017] The liquid crystal display screen comprises a liquid crystal display panel and the above-mentioned backlight module.

[0018] The middle frame is connected to the side of the backlight module away from the liquid crystal display panel.

[0019] Optionally, the thickness of the edge display part of the liquid crystal display panel is less than the thickness of the central display part.

[0020] Optionally, the thickness of each position in the edge display part gradually increases in the direction close to the central display part, and the difference between the thickness of the position farthest from the central display part in the edge display part and the thickness of the central display part is equal to the maximum deformation amount of the liquid crystal display panel.

[0021] Optionally, the outer boundary of the normal projection of the edge region of the light guide plate on the liquid crystal display panel coincides with the outer boundary of the edge display part.

[0022] In another aspect, a preparation method of a terminal device is provided, the method comprising:

[0023] Assembling the above-mentioned backlight module and the liquid crystal display panel to obtain a liquid crystal display screen.

[0024] The middle frame is attached to the side of the backlight module away from the liquid crystal display panel, and the liquid crystal display panel and the middle frame are subjected to a pressing process, so that the middle frame is connected to the side of the backlight module away from the liquid crystal display panel, and the thickness of the edge display part of the liquid crystal display panel is less than the thickness of the central display part.

[0025] Optionally, the pressing process of the liquid crystal display panel and the middle frame comprises:

[0026] The attached middle frame and liquid crystal display panel are placed in a pressing device, and the pressing device continuously applies a pressing force to the middle frame and the liquid crystal display panel for a first duration;

[0027] The attached middle frame and liquid crystal display panel are taken out of the receiving groove and left to stand for a second duration;

[0028] The pressing device comprises a first pressing plate and a second pressing plate, the first pressing plate has a receiving groove and an elastic structure in the receiving groove, and the second pressing plate has a buffer structure.

[0029] The receiving groove is used to accommodate the attached middle frame and liquid crystal display panel, and after the attached middle frame and liquid crystal display panel are located in the receiving groove, the elastic structure is in contact with the middle frame, and the buffer structure is in contact with the liquid crystal display panel.

[0030] Optionally, the range of the pressing force, the first duration is greater than or equal to 3 hours, and the second duration is greater than or equal to 7 hours.

[0031] The technical scheme provided by the embodiments of the present application has at least the following beneficial effects:

[0032] The backlight module comprises a light source and a light guide plate. The light rays emitted by the light source and reflected by the first plurality of dots are used to irradiate the edge display part of the liquid crystal display panel. The light rays emitted by the light source and reflected by the second plurality of dots are used to irradiate the central display part of the liquid crystal display panel. In this case, the density of the first plurality of dots distributed at the first position in the edge area of the light guide plate is less than the density of the second plurality of dots distributed at the position adjacent to the first position in the central area of the light guide plate. Therefore, the light flux emitted by the light guide plate from the edge area is less than the light flux emitted from the central area. Thus, the light rays with smaller light flux emitted from the edge area of the light guide plate are irradiated to the edge display part of the liquid crystal display panel with smaller thickness, and the light rays with larger light flux emitted from the central area of the light guide plate are irradiated to the central display part of the liquid crystal display panel with larger thickness, so that the brightness of the edge display part of the liquid crystal display panel is approximately equal to the brightness of the central display part. Therefore, by adjusting the density of the first plurality of dots in the edge area, the brightness difference caused by the smaller thickness of the edge display part of the liquid crystal display panel than the thickness of the central display part can be compensated, so that the uniformity of the display brightness of the liquid crystal display screen is higher, and the display effect of the liquid crystal display screen is effectively improved.

[0033] It should be understood that the general description above and the following detailed description are only exemplary and cannot limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0034] The accompanying drawings, which are incorporated into and form part of the specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the application.

[0035] Figure 1 is an exploded view of a backlight module provided by an embodiment of the present application;

[0036] Figure 2 is Figure 1 is a top view of the backlight module;

[0037] Figure 3 is Figure 2 is a partial enlarged view of the backlight module at B;

[0038] Figure 4 is Figure 1 is a light path diagram of the backlight module;

[0039] Figure 5 is a structural schematic diagram of a backlight module provided by an embodiment of the present application;

[0040] Figure 6 is a structural schematic diagram of a terminal device provided by an embodiment of the present application;

[0041] Figure 7is a flowchart of a preparation method of a terminal device provided by an embodiment of the present application.

[0042] Figure 8 is a structural schematic diagram of a pressing device provided by an embodiment of the present application. DETAILED DESCRIPTION

[0043] To make the purpose, technical solutions and advantages of the present application clearer, the embodiments of the present application will be further described in detail below with reference to the drawings.

[0044] At present, a terminal device can include a liquid crystal display screen and a middle frame. When assembling the terminal device, the edge part of the liquid crystal display screen and the middle frame are generally adhered by point gluing; then, the adhered liquid crystal display screen and the middle frame are subjected to pressing processing, so that the liquid crystal display screen and the middle frame can be connected by adhesion.

[0045] Among them, the liquid crystal display screen generally includes a backlight module and a liquid crystal display panel. When the adhered liquid crystal display screen and the middle frame are subjected to pressing processing, the edge part of the liquid crystal display screen and the middle frame need to be subjected to pressing force. In this way, the edge display part of the liquid crystal display panel in the liquid crystal display screen will be deformed by the pressing force, resulting in that the thickness of the edge display part of the liquid crystal display panel is less than the thickness of the central display part. The thickness of the liquid crystal display panel is negatively correlated with the brightness of the liquid crystal display screen when displaying a picture, that is, the smaller the thickness of the liquid crystal display panel, the higher the brightness of the liquid crystal display screen when displaying a picture. In this way, the brightness of the edge display part of the liquid crystal display screen can be higher than the brightness of the central display part, thereby resulting in that the display effect of the liquid crystal display screen is poor.

[0046] Please refer to Figure 1 and Figure 2 , Figure 1 is an exploded view of a backlight module provided by an embodiment of the present application, Figure 2 is Figure 1 a top view of the backlight module. The backlight module 000 can include a light source 100 and a light guide plate 200.

[0047] The light emitting surface of the light source 100 in the backlight module 000 can be towards the side surface of the light guide plate 200. That is, the backlight module 000 is a side-in backlight module. Here, the light source 100 can be a lamp strip.

[0048] In order to more clearly see the structure of the light guide plate 200 in the backlight module 000, please refer to Figure 3 , Figure 3 is Figure 2The backlight module is shown in a partial enlarged view at B. The light guide plate 200 in the backlight module 000 has a central region 200a, and an edge region 200b located at the periphery of the central region 200a. For example, the edge region 200b can be an annular region distributed around the central region 200a. In the light guide plate 200, a plurality of first dots 201 are arranged in the edge region 200b, and a plurality of second dots 202 are arranged in the central region 200a.

[0049] The density of the first dots 201 distributed at a first position in the edge region 200b of the light guide plate 200 is less than the density of the second dots 202 distributed at a position adjacent to the first position in the central region 200a of the light guide plate 200. Here, the first position refers to any position in the edge region 200b.

[0050] It should be noted that the density of the first dots 201 distributed at the first position in the edge region 200b refers to the number of first dots 201 distributed per unit area at any position in the edge region 200b. Correspondingly, the density of the second dots 202 distributed at the position adjacent to the first position in the central region 200a refers to the number of second dots 202 distributed per unit area at the position closest to the first position in the central region 200a.

[0051] For example, assuming that in the light guide plate 200, position B1 is a certain position in the edge region 200b, and position B2 is a position adjacent to position B1 in the central region 200a. Then, the density of the first dots 201 arranged at position B1 in the light guide plate 200 is less than the density of the second dots 202 arranged at position B2.

[0052] In the embodiments of the present application, as shown in Figure 4 , Figure 4 is Figure 1 The light path diagram of the backlight module is shown. After the light emitted by the light source 100 enters the light guide plate 200 from the side surface, the incident light can be reflected multiple times between the two plate surfaces (A1, A2) of the light guide plate 200. In the present application, the plurality of first dots 201 and the plurality of second dots 202 can be arranged on one plate surface A1 of the light guide plate 200. In this way, the first dots 201 and the second dots 202 can reflect part of the light incident on the plate surface A1 out of the light guide plate 200, so that the light emitted by the light source 100 can be emitted from the plate surface A2 of the light guide plate 200.

[0053] It should be noted that after the backlight module 000 provided by the embodiment of the present application is assembled with the liquid crystal display panel to obtain a liquid crystal display screen, the liquid crystal display screen can be attached to the middle frame and subjected to a pressing process to realize the connection between the liquid crystal display screen and the middle frame. However, after the attached liquid crystal display screen and the middle frame are subjected to the pressing process, the thickness of the edge display part of the liquid crystal display panel is less than the thickness of the central display part. The edge display part of the liquid crystal display panel is an annular display part surrounding the central display part.

[0054] In the embodiment of the present application, the light rays of the light rays emitted by the light source 100 and reflected by the plurality of first dots 201 are used to be incident on the edge display part of the liquid crystal display panel. The light rays of the light rays emitted by the light source 100 and reflected by the plurality of second dots 202 are used to be incident on the central display part of the liquid crystal display panel. In this case, since the density of the first dots 201 distributed at the first position in the edge region 200b of the light guide plate 200 is less than the density of the second dots 202 distributed at the position adjacent to the first position in the central region 200a of the light guide plate 200, the light flux emitted by the light guide plate 200 from the edge region 200b is less than the light flux emitted from the central region 200a. Thus, the light rays with small light flux emitted from the edge region 200b of the light guide plate 200 are incident on the edge display part of the liquid crystal display panel with small thickness, and the light rays with large light flux emitted from the central region 200a of the light guide plate 200 are incident on the central display part of the liquid crystal display panel with large thickness, so that the brightness of the edge display part of the liquid crystal display panel 000 can be ensured to be approximately equal to the brightness of the central display part. As can be seen, by adjusting the density of the first dots in the edge region, the brightness difference caused by the thickness of the edge display part of the liquid crystal display panel being less than the thickness of the central display part can be compensated, so that the uniformity of the display brightness of the liquid crystal display screen is high, and thus the display effect of the liquid crystal display screen is effectively improved.

[0055] In summary, the backlight module provided by the embodiment of the present application comprises a light source and a light guide plate. The light rays emitted by the light source and reflected by the first dots are used to irradiate the edge display part of the liquid crystal display panel. The light rays emitted by the light source and reflected by the second dots are used to irradiate the central display part of the liquid crystal display panel. In this case, the density of the first dots distributed at the first position in the edge area of the light guide plate is less than the density of the second dots distributed at the position adjacent to the first position in the central area of the light guide plate. Therefore, the light flux emitted by the light guide plate from the edge area is less than the light flux emitted from the central area. Thus, the light rays with small light flux emitted from the edge area of the light guide plate are irradiated to the edge display part of the liquid crystal display panel with small thickness, and the light rays with large light flux emitted from the central area of the light guide plate are irradiated to the central display part of the liquid crystal display panel with large thickness, so that the brightness of the edge display part of the liquid crystal display panel is approximately equal to the brightness of the central display part. Therefore, by adjusting the density of the first dots in the edge area, the brightness difference caused by the thickness difference between the edge display part and the central display part of the liquid crystal display panel can be compensated, so that the uniformity of the display brightness of the liquid crystal display screen is high, and the display effect of the liquid crystal display screen is effectively improved.

[0056] In the embodiment of the present application, the width of the edge area 200b in the light guide plate 200 can be equal to the width of the edge display part of the liquid crystal display panel. Since the width of the edge display part with different thickness from the central display part in the liquid crystal display panel ranges from 4 mm to 6 mm, the width of the edge area 200b in the light guide plate 200 can also range from 4 mm to 6 mm. For example, the width of the edge area 200b in the light guide plate 200 can be 5.5 mm. Thus, the light rays with small light flux emitted from the edge area 200b of the light guide plate 200 can only be irradiated to the edge display part of the liquid crystal display panel, and the light rays with large light flux emitted from the central area 200a of the light guide plate 200 can only be irradiated to the central display part of the liquid crystal display panel, so that the uniformity of the display brightness of the liquid crystal display screen is further improved.

[0057] In the present application, the density of the first dots 201 distributed at each position in the edge region 200b of the light guide plate 200 gradually increases along the direction close to the central region 200a. In this case, the thickness of the edge display part of the liquid crystal display panel gradually increases along the direction close to the central display part. Therefore, when the density of the first dots 201 distributed at each position in the edge region 200b of the light guide plate 200 gradually increases along the direction close to the central region 200a, the luminous flux of the light rays emitted by the edge region 200b of the light guide plate 200 gradually increases along the direction close to the central region 200a, so that the luminance uniformity of the edge display part of the liquid crystal display panel is higher after the light rays emitted by the edge region 200b of the light guide plate 200 pass through the edge display part of the liquid crystal display panel. In this way, the light guide plate 200 can gradually compensate for the luminance difference caused by the deformation of the liquid crystal display panel along the direction close to the central region 200b in the edge region 200b, and further make the final luminance of the edge display part of the liquid crystal display panel close to the final luminance of the central display part.

[0058] Optionally, the deformation amount of the liquid crystal display panel gradually decreases along the direction close to the central display part. And the deformation amount of the liquid crystal display panel reaches the maximum at the position farthest from the central display part. That is, the thickness of the liquid crystal display panel at each position in the edge display part gradually increases along the direction close to the central display part, and the difference between the thickness of the edge display part at the position farthest from the central display part and the thickness of the central display part is equal to the maximum deformation amount of the liquid crystal display panel.

[0059] In this case, since the deformation amount of the liquid crystal display panel reaches the maximum in the edge display part, the deformation amount of the edge display part at each position is similar, and thus the thickness of the liquid crystal display panel at each position in the edge display part is similar, and the display luminance is the same, which facilitates the compensation of the luminance of the liquid crystal display panel at each position in the edge display part by the light guide plate 200 in the backlight module 000, and further makes the final luminance of the liquid crystal display panel at each position similar. For example, the density of the first dots 201 arranged at each position in the edge region 200b of the light guide plate 200 can be reduced by 20% to 30% relative to the density of the dots arranged at the position in the light guide plate in the related art, so as to ensure that the luminance of the edge display part of the liquid crystal display panel is approximately equal to the luminance of the central display part.

[0060] Optionally, the light source 100 has an emitting surface facing the side of the light guide plate 200, and the luminance of the light source 100 gradually decreases along the direction away from the light source 100. In order to make the luminance of the central region 200a of the light guide plate 200 at each position similar, the density of the second dots 202 distributed in the central region 200a of the light guide plate 200 gradually increases along the direction away from the light source 100. That is, the density of the second dots 202 distributed in the central region 200a of the light guide plate 200 at the second position is positively correlated with the horizontal distance between the emitting surface of the light source 100 and the second position. The second position 200 is any position in the central region 200a. Because the density of the second dots 202 in the central region 200a of the light guide plate 200 is positively correlated with the distance between the position and the emitting surface of the light source 100, the luminance of the light source 100 along the direction away from the emitting surface of the light source 100 can be compensated, so that the luminance of the central display part of the liquid crystal display panel after the light emitted by the central region 200a of the light guide plate 200 passes through the central display part is more uniform.

[0061] It should be noted that, as shown in Figure 2 , the edge region 200b of the light guide plate 200 can have two first strip-shaped edge regions C1 parallel to the length direction of the light source 100, and two second strip-shaped edge regions C2 perpendicular to the length direction of the light source 100. In each first strip-shaped edge region C1, the density of the first dots 201 distributed at each position can gradually increase along the direction close to the central region 200a. In each second strip-shaped edge region C2, the density of the first dots 201 distributed at each position is not only positively correlated with the horizontal distance between the position and the emitting surface of the light source 100, but also gradually increases along the direction close to the central region 200a. In this way, the luminance of the liquid crystal display panel at each position after the light emitted by the light guide plate 200 passes through the liquid crystal display panel is more uniform.

[0062] Optionally, please refer to Figure 5 , Figure 5 is a structural schematic diagram of a backlight module provided by the embodiment of the present application. The backlight module 000 further includes a frame 300, a reflecting sheet 400 and an optical film 500. The light source 100, the light guide plate 200, the reflecting sheet 300 and the optical film 400 are all located in the frame 300, and the optical film 400 is located on the side of the light guide plate 200 opposite to the plate surface on which the plurality of first dots 201 are arranged, and the reflecting sheet 300 is located on the side of the light guide plate 300 away from the optical film 400.

[0063] The frame 300 is used to support and fix the light source 100, the light guide plate 200, the reflecting sheet 300 and the optical film sheet 400. The light rays emitted by the light source 100 are transmitted to the side close to the optical film sheet 400 through the light guide plate 200. The reflecting sheet 300 can reflect part of the light rays transmitted by the light guide plate 200 to the side close to the reflecting sheet 300, change the transmission direction of the part of the light rays, and make the part of the light rays also transmitted to the side close to the optical film sheet 400.

[0064] The optical film sheet 400 can include a diffusion sheet on the light guide plate 200 and two light enhancement sheets on the side of the diffusion sheet away from the light guide plate 200. The diffusion sheet can make the light rays transmitted by the light guide plate 200 more uniformly distributed; and the light enhancement sheets can enhance the light rays transmitted by the light guide plate 200.

[0065] In summary, the backlight module provided by the embodiment of the present application includes a light source and a light guide plate. The light rays emitted by the light source and reflected by the plurality of first net points are used to be emitted to the edge display part of the liquid crystal display panel. The light rays emitted by the light source and reflected by the plurality of second net points are used to be emitted to the central display part of the liquid crystal display panel. In this case, the density of the first net points distributed at the first position in the edge region of the light guide plate is less than the density of the second net points distributed at the position adjacent to the first position in the central region of the light guide plate. Therefore, the light flux emitted by the light guide plate from the edge region is less than the light flux emitted from the central region. Thus, the light rays with small light flux emitted from the edge region of the light guide plate are emitted to the edge display part of the liquid crystal display panel with small thickness, and the light rays with large light flux emitted from the central region of the light guide plate are emitted to the central display part of the liquid crystal display panel with large thickness, so that the brightness of the edge display part of the liquid crystal display panel can be ensured to be approximately equal to the brightness of the central display part. Therefore, by adjusting the density of the first net points in the edge region, the brightness difference caused by the thickness of the edge display part of the liquid crystal display panel being less than the thickness of the central display part can be compensated, the uniformity of the display brightness of the liquid crystal display panel is high, and thus the display effect of the liquid crystal display panel is effectively improved.

[0066] Please refer to Figure 6 , Figure 6Fig. 1 is a structural schematic diagram of a terminal device provided by an embodiment of the present application. The terminal device 00 comprises a middle frame 10 and a liquid crystal display screen 20; the liquid crystal display screen 20 comprises a liquid crystal display panel and a backlight module 000. First, the liquid crystal display panel and the backlight module 000 are assembled to obtain the liquid crystal display screen 20, and then the middle frame 10 is assembled with the liquid crystal display screen 20 to obtain the terminal device. The middle frame 10 is connected to the side of the backlight module 000 which is away from the liquid crystal display panel. After the middle frame 10 is assembled with the liquid crystal display screen 20 by pressing force, the edge display part of the liquid crystal display panel is deformed due to the pressing force, so that the thickness of the edge display part of the liquid crystal display panel is less than the thickness of the central display part.

[0067] Optionally, the deformation amount of the liquid crystal display panel gradually decreases along the direction close to the central display part, and the deformation amount of the liquid crystal display panel reaches the maximum at the position farthest from the central display part. That is, the thickness of the liquid crystal display panel at each position in the edge display part gradually increases along the direction close to the central display part, and the difference between the thickness of the position farthest from the central display part in the edge display part and the thickness of the central display part is equal to the maximum deformation amount of the liquid crystal display panel.

[0068] In this case, since the deformation amount of the liquid crystal display panel reaches the maximum in the edge display part, the deformation amount of the edge display part at each position is similar, and thus the thickness of the liquid crystal display panel at each position in the edge display part is similar, and the display brightness is the same, so that the brightness of the liquid crystal display panel at each position in the edge display part can be compensated by the light guide plate 200 in the backlight module 000, and thus the final brightness of the liquid crystal display screen 20 at each position is similar.

[0069] In the present application, the edge display part of the liquid crystal display panel is consistent with the edge region 200b of the light guide plate 200, that is, the outer boundary of the orthographic projection of the edge region 200b of the light guide plate 200 on the liquid crystal display panel is coincident with the outer boundary of the edge display part. In this case, since the liquid crystal display panel is deformed in the edge display part, and the edge region 200b of the light guide plate 200 is coincident with the deformed region of the liquid crystal display panel, the brightness of the deformed region can be accurately compensated by the light guide plate 200, and thus the final brightness of the liquid crystal display screen 20 at each position is further similar.

[0070] It should be noted that the light guide plate 200 in the terminal device is the same as the light guide plate 200 shown in Fig. 1, and correspondingly, the light guide principle of the light guide plate 200 is the same as the light guide principle of the light guide plate 200 shown in Fig. 1, which will not be described here. Figure 1 The light guide principle of the light guide plate 200 is the same as the light guide principle of the light guide plate 200 shown in Fig. 1, which will not be described here. Figure 1 The light guide principle of the light guide plate 200 is the same as the light guide principle of the light guide plate 200 shown in Fig. 1, which will not be described here.

[0071] In summary, the terminal device provided by the embodiment of the present application comprises a middle frame and a liquid crystal display screen; the liquid crystal display screen comprises a liquid crystal display panel and a backlight module, and the backlight module comprises a light source and a light guide plate. The light rays emitted by the light source and reflected by the plurality of first dots are used to shoot at the edge display part of the liquid crystal display panel. The light rays emitted by the light source and reflected by the plurality of second dots are used to shoot at the central display part of the liquid crystal display panel. In this case, the density of the first dots distributed at the first position in the edge area of the light guide plate is less than the density of the second dots distributed at the position adjacent to the first position in the central area of the light guide plate. Therefore, the light flux emitted by the light guide plate from the edge area is less than the light flux emitted from the central area. In this way, the light rays with small light flux emitted from the edge area of the light guide plate shoot at the edge display part of the liquid crystal display panel with small thickness, and the light rays with large light flux emitted from the central area of the light guide plate shoot at the central display part of the liquid crystal display panel with large thickness, so that the brightness of the edge display part of the liquid crystal display panel can be ensured to be approximately equal to the brightness of the central display part. As can be seen, by adjusting the density of the first dots in the edge area, the brightness difference caused by the thickness of the edge display part of the liquid crystal display panel being less than the thickness of the central display part can be compensated, so that the display brightness of the liquid crystal display screen is more uniform, and the display effect of the liquid crystal display screen is effectively improved.

[0072] Please refer to Figure 7 , Figure 7 is a flowchart of a preparation method of a terminal device provided by the embodiment of the present application. The preparation method of the terminal device comprises the following steps:

[0073] Step 701, assembling the backlight module and the liquid crystal display panel to obtain a liquid crystal display screen.

[0074] The backlight module and the liquid crystal display panel can be assembled together by buckling or by using glue. It should be noted that the liquid crystal display panel itself cannot emit light, the light inlet surface of the backlight module is connected with the liquid crystal display panel, the backlight module provides a backlight source for the liquid crystal display panel, and thus the assembled liquid crystal display screen can display normally.

[0075] Step 702, attaching the middle frame to the side of the backlight module away from the liquid crystal display panel, and performing compression treatment on the liquid crystal display screen and the middle frame, so that the middle frame is connected to the side of the backlight module away from the liquid crystal display panel, and the thickness of the edge display part of the liquid crystal display panel is less than the thickness of the central display part.

[0076] The middle frame and the backlight module are connected by the side of the backlight module away from the liquid crystal display panel through the dispensing and adhering, in order to ensure the effectiveness of the adhering between the liquid crystal display panel and the middle frame, the adhered liquid crystal display panel and the middle frame are subjected to pressing treatment. After the adhering treatment, the middle frame and the backlight module are connected by the side of the backlight module away from the liquid crystal display panel, and the thickness of the edge display part of the liquid crystal display panel is less than the thickness of the central display part.

[0077] Optionally, the adhered liquid crystal display panel and the middle frame are subjected to pressing treatment by the pressing device. Correspondingly, the pressing treatment of the adhered liquid crystal display panel and the middle frame can be realized by the following steps (1) to (2):

[0078] (1) The adhered middle frame and the liquid crystal display panel are placed in the pressing device, and the pressing device continuously applies a pressing force with a first duration to the middle frame and the liquid crystal display panel.

[0079] The pressing device can continuously apply a pressing force to the middle frame and the liquid crystal display panel. In order to make the edge display part of the liquid crystal display panel reach the maximum deformation amount at each position, a larger pressing force than that in the prior art needs to be applied. Optionally, the range of the pressing force is 20-30 N. For example, the pressing force is 25 N.

[0080] In order to ensure the effectiveness of the adhering between the liquid crystal display panel and the middle frame, the middle frame and the backlight module are connected by the side of the backlight module away from the liquid crystal display panel, and the pressing device needs to continuously apply a pressing force with a first duration to the middle frame and the liquid crystal display panel. Optionally, the first duration is greater than or equal to 3 hours. For example, the first duration is 4 hours.

[0081] Please refer to Figure 8 , Figure 8 is a structural schematic diagram of a pressing device provided by the embodiment of the present application. The pressing device 0 comprises a first pressing plate 1 and a second pressing plate 2. The first pressing plate 1 has a receiving groove 3, and the receiving groove 3 has an elastic structure 31. The second pressing plate 2 has a buffer structure 21. The receiving groove 3 is used for accommodating the adhered middle frame and the liquid crystal display panel. After the adhered middle frame and the liquid crystal display panel are located in the receiving groove 3, the elastic structure 31 contacts the middle frame, and the buffer structure 21 contacts the liquid crystal display panel. Optionally, the elastic structure 31 comprises a plurality of compression springs, one end of each compression spring is connected with the groove surface of the receiving groove, and the other end is used for supporting the middle frame; wherein the maximum elastic force of the compression spring is greater than or equal to the pressing force.

[0082] Optionally, the step of continuously applying the pressing force to the middle frame and the liquid crystal display screen for the first time length by the pressing device is: applying the pressing force to the second pressing plate 2 to drive the second pressing plate 2 to move towards the first pressing plate 1, and continuously applying the pressing force to the second pressing plate 2 for the first time length after the second pressing plate 2 stops moving. Optionally, the second pressing plate 2 moves towards the first pressing plate 1 until the first pressing plate 1 and the second pressing plate 2 are in contact, and then the second pressing plate 2 stops moving.

[0083] For example, referring to Figure 7 Optionally, the pressing force applied by the second pressing plate 2 can be provided by the magnetic structure 4 arranged on the first pressing plate 1 and the second pressing plate 2. In this case, since the attractive force between the magnetic structures 4 is positively correlated with the magnetic field strength of the magnetic structure 4, thus, under the condition that the number and magnetic field strength of the magnetic structure 4 are constant, the pressing force provided by the magnetic structure 4 is relatively stable, thereby facilitating the continuous application of the pressing force to the second pressing plate 2 for the first time length.

[0084] (2) Take out the middle frame and the liquid crystal display screen after bonding from the containing groove, and stand for a second time length.

[0085] In order to further ensure the effectiveness of the bonding between the liquid crystal display screen and the middle frame, a second time length of standing is required after the pressure maintaining process. Optionally, the second time length is greater than or equal to 7 hours. For example, the second time length is 8 hours.

[0086] In summary, the preparation method of the terminal device provided by the embodiment of the present application is that the light rays in the light emitted by the light source are reflected by the plurality of first dots and used to shoot the edge display part of the liquid crystal display panel. The light rays in the light emitted by the light source are reflected by the plurality of second dots and used to shoot the central display part of the liquid crystal display panel. In this case, the density of the first dots distributed at the first position in the edge region of the light guide plate is less than the density of the second dots distributed at the position adjacent to the first position in the central region of the light guide plate. Therefore, the light flux emitted by the light guide plate from the edge region is less than the light flux emitted from the central region. Thus, after the light rays with smaller light flux emitted from the edge region of the light guide plate shoot the edge display part of the liquid crystal display panel with smaller thickness, and the light rays with larger light flux emitted from the central region of the light guide plate shoot the central display part of the liquid crystal display panel with larger thickness, the brightness of the edge display part of the liquid crystal display panel can be ensured to be approximately equal to the brightness of the central display part. As can be seen, by adjusting the density of the first dots in the edge region, the brightness difference caused by the thickness of the edge display part of the liquid crystal display panel being smaller than the thickness of the central display part can be compensated, so that the uniformity of the display brightness of the liquid crystal display screen is higher, and thus the display effect of the liquid crystal display screen is effectively improved.

[0087] All the optional technical solutions above can be combined in any manner to form optional embodiments of the present application, and will not be repeated here.

[0088] Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. It is intended that the specification and examples be considered as exemplary only, with the true scope and spirit of the application being indicated by the following claims.

[0089] It should be understood that the application is not limited to the precise construction that has been described above and shown in the accompanying drawings, and that various modifications and changes can be made by those skilled in the art without departing from the scope of the application. The scope of the application is indicated only by the appended claims.

Claims

1. A backlight module, characterized in that, The backlight module comprises: a light source (100) and a light guide plate (200); an emitting surface of the light source (100) faces a side surface of the light guide plate (200); the light guide plate (200) has a central region (200a) and an edge region (200b) located at a periphery of the central region (200a), a plurality of first dots (201) are arranged in the edge region (200b), a plurality of second dots (202) are arranged in the central region (200a), a density of the first dots (201) distributed at a first position in the edge region (200b) is less than a density of the second dots (202) distributed at a position adjacent to the first position in the central region (200a), and the first position is any position in the edge region (200b); wherein light rays emitted by the light source (100) and reflected by the plurality of first dots (201) are used to irradiate an edge display part of a liquid crystal display panel, and light rays emitted by the light source (100) and reflected by the plurality of second dots (202) are used to irradiate a central display part of the liquid crystal display panel; after the liquid crystal display panel is subjected to a pressing process with a middle frame, a thickness of the edge display part is less than a thickness of the central display part, the edge region (200b) is an annular region distributed around the central region (200a), an outer boundary of a normal projection of the edge region (200b) on the liquid crystal display panel coincides with an outer boundary of the edge display part, a width of the edge region (200b) is equal to a width of the edge display part, so that light rays emitted by the edge region (200b) irradiate the edge display part, and light rays emitted by the central region (200a) irradiate the central display part.

2. The backlight module of claim 1, wherein, The density of the first dots (201) distributed at each position in the edge region (200b) gradually increases along a direction close to the central region (200a).

3. The backlight module of claim 1, wherein, The density of the second dots (202) distributed at a second position in the central region (200a) is positively correlated with a horizontal distance between the emitting surface of the light source (100) and the second position, and the second position is any position in the central region (200a).

4. The backlight module according to any one of claims 1 to 3, wherein, The width of the edge region (200b) ranges from 4 mm to 6 mm.

5. The backlight module of any of claims 1 to 3, wherein, The plurality of first dots (201) and the plurality of second dots (202) are distributed on a same plate surface of the light guide plate (200).

6. The backlight module of claim 5, wherein, The backlight module further comprises a frame body (300), a reflective sheet (400) and an optical film sheet (500). The light source (100), the light guide plate (200), the reflective sheet (400) and the optical film (500) are located in the frame (300), and the optical film (500) is located on the side of the light guide plate (200) opposite to the plate surface on which the plurality of first net points (201) are arranged, and the reflective sheet (400) is located on the side of the light guide plate (200) away from the optical film (500).

7. A terminal device, characterized by, Comprise: The middle frame (10) and the liquid crystal display screen (20); The liquid crystal display screen (20) comprises: a liquid crystal display panel and the backlight module of any one of claims 1 to 6; The middle frame (10) is connected to the side of the backlight module away from the liquid crystal display panel; The thickness of the edge display part of the liquid crystal display panel is less than the thickness of the central display part.

8. The terminal device according to claim 7, characterized by The thickness of each position in the edge display part gradually increases in the direction close to the central display part, and the difference between the thickness of the position farthest from the central display part in the edge display part and the thickness of the central display part is equal to the maximum deformation amount of the liquid crystal display panel.

9. A method of manufacturing a terminal device, characterized by, The method comprises: Assembling the backlight module of any one of claims 1 to 6 with the liquid crystal display panel to obtain a liquid crystal display screen; Attaching the middle frame to the side of the backlight module away from the liquid crystal display panel, and pressing the liquid crystal display screen and the middle frame to connect the middle frame to the side of the backlight module away from the liquid crystal display panel, and to make the thickness of the edge display part of the liquid crystal display panel less than the thickness of the central display part.

10. The method of claim 9, wherein, The pressing process of the liquid crystal display screen and the middle frame comprises: Placing the attached middle frame and the liquid crystal display screen in a pressing device, and continuously applying a pressing force to the middle frame and the liquid crystal display screen for a first duration; the pressing device comprises: a first pressing plate and a second pressing plate, the first pressing plate has a receiving groove and an elastic structure in the receiving groove, and the second pressing plate has a buffer structure; Taking the attached middle frame and the liquid crystal display screen out of the receiving groove and resting for a second duration; The receiving groove is used to accommodate the attached middle frame and the liquid crystal display screen, and after the attached middle frame and the liquid crystal display screen are located in the receiving groove, the elastic structure is in contact with the middle frame, and the buffer structure is in contact with the liquid crystal display panel.

11. The method of claim 10, wherein, The range of the pressing force is 20 to 30 Newton, the first duration is greater than or equal to 3 hours, and the second duration is greater than or equal to 7 hours.

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