Backlight module and display device

Abstract

The invention provides a backlight module which comprises a diffusion plate and a light-emitting assembly located on the light inlet side of the diffusion plate, and the light-emitting assembly comprises a plurality of light-emitting bodies arranged in an array; the diffusion plate comprises a middle area and an edge area arranged around the middle area, the width, perpendicular to the edge direction, of the edge area is c, the minimum distance between the orthographic projection, on the diffusion plate, of the outermost light-emitting body in the light-emitting assemblies and the edge of the diffusion plate is a, the distance between the adjacent light-emitting assemblies is b, and c = a + b; an ink layer is arranged on the surface, away from the light-emitting assembly, of the diffusion plate, and the unit ink amount of the ink layer in the middle area is larger than that of the ink layer in the edge area, so that the transmittance of the middle area of the diffusion plate is smaller than that of the edge area, and the light and shade difference between the middle area and the edge area of the diffusion plate is reduced. And the uniformity of brightness on the diffusion plate is improved, so that the backlight effect of the backlight module is improved. The invention further provides a display device.

Description

Technical Field

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

[0002] Nowadays, liquid crystal displays (LCDs) are developing faster and faster. Generally speaking, LCDs include a liquid crystal display panel and a backlight module. The liquid crystal display panel is composed of a thin film transistor substrate, a color filter substrate, and a liquid crystal layer disposed on the two substrates. The backlight module is used to provide the light source required by the liquid crystal display panel so that the liquid crystal display device can achieve a display effect.

[0003] The working principle of the liquid crystal display panel is to place liquid crystal molecules between two parallel glass substrates. There are many vertical and horizontal thin wires between the two glass substrates. The direction of the liquid crystal analysis is controlled by whether the power is turned on or not, and the light from the backlight module is refracted to produce the picture.

[0004] The backlight module is divided into two types, namely, the side-entry backlight module and the direct-type backlight module, depending on the different incident positions of the light source. The side-entry backlight module sets the backlight LED light bar at the edge of the back panel behind the side of the liquid crystal display panel. The light emitted by the LED light bar enters the diffuser from the light incident surface on one side of the diffuser, and is reflected and diffused before being emitted from the light emitting surface of the diffuser, and then passes through the optical film group to form a surface light source to provide to the liquid crystal display panel. The direct-type backlight module sets the light source behind the liquid crystal panel, directly forming a surface light source to provide to the liquid crystal panel. The diffuser included in it is a key component of the entire direct-type backlight module.

[0005] With the development of LCD, the demand for narrow-border modules has gradually increased, and LCD splicing screens have been derived. Because they need to be spliced ​​together, the demand for splicing screen borders is getting narrower and narrower, and the image quality requirements on both sides of the seam are getting higher and higher. Currently, the narrowest is the RNB splicing screen. Because the border is less than 1mm, the surrounding design space is limited, and the space position of the direct-type backlight source is limited, there is a problem of low brightness on both sides of the seam, resulting in dark areas (also known as shadow areas) on both sides of the seam. The existence of dark areas will affect the display effect of the display device. Summary of the invention

[0006] The present invention aims to solve at least one of the technical problems existing in the prior art, and proposes a backlight module and a display device.

[0007] To achieve the above-mentioned purpose, an embodiment of the present disclosure provides a backlight module, including a diffuser plate and a light-emitting component located on the light incident side of the diffuser plate, the light-emitting component including a plurality of light-emitting bodies arranged in an array; the diffuser plate includes a middle area and an edge area arranged around the middle area, the width of the edge area perpendicular to its edge direction is c, the minimum distance between the orthographic projection of the light-emitting body at the edge of the light-emitting component on the diffuser plate and the edge of the diffuser plate is a, and the spacing between adjacent light-emitting components is b, wherein c=a+b; wherein an ink layer is provided on the surface of the diffuser plate facing away from the light-emitting component, and the unit ink amount of the ink layer in the middle area is greater than the unit ink amount of the ink layer in the edge area.

[0008] In some embodiments, the edge area includes multiple first areas and multiple second areas, at least one side of the first area is adjacent to the middle area; the unit ink volume of the ink layer in the first area is greater than or equal to the unit ink volume of the ink layer in the second area.

[0009] In some embodiments, the unit ink volume of the ink layer in the middle region is the same everywhere, and the unit ink volume of the ink layer in the second region is the same everywhere; the unit ink volume of the ink layer in the middle region is twice the unit ink volume of the ink layer in the second region.

[0010] In some embodiments, the unit ink usage of the ink layer in the first area gradually increases from the edge of the diffusion plate toward the middle area.

[0011] In some embodiments, the unit ink usage of the ink layer in the first region meets the following formula: y=0.35x 2 -2.15x+51.75, where x is the distance from the edge of the diffuser plate and y is the unit ink usage.

[0012] In some embodiments, the light-emitting component includes a plurality of light-emitting bodies, which are used to emit light toward the diffusion plate after being powered on; the plurality of light-emitting bodies include a first light-emitting group corresponding to the middle area and a second light-emitting group corresponding to the edge area, and the current intensity of the second light-emitting group is greater than the current intensity of the first light-emitting group.

[0013] In some embodiments, the edge region includes multiple first regions and multiple second regions, and at least one side of the first region is adjacent to the middle region; the second light-emitting group includes a first subgroup corresponding to the first region and a second subgroup corresponding to the second region, and the current intensity of the first subgroup is less than the current intensity of the second subgroup.

[0014] In some embodiments, the middle area includes a third area and a fourth area surrounding the third area; the first light-emitting group includes a third subgroup corresponding to the third area and a fourth subgroup corresponding to the fourth area, and the current intensity of the third subgroup is less than the current intensity of the fourth subgroup.

[0015] In some embodiments, the ratio among the current intensity of the third subgroup, the current intensity of the fourth subgroup, the current intensity of the first subgroup and the current intensity of the second subgroup is 52:65:75:80.

[0016] In some embodiments, the backlight module also includes: a reflector, which is arranged on the outside of the diffuser, and is used to collect light emitted by the light-emitting component that does not enter the diffuser, and reflect the collected light to the edge area to increase the brightness of the edge area.

[0017] In some embodiments, the reflectivity of the reflective element is 80% to 95%.

[0018] In some embodiments, the thickness of the diffuser plate is greater than or equal to 1.1 mm and less than or equal to 3 mm.

[0019] The embodiment of the present disclosure further provides a display device, including a display panel and the backlight module as described above, wherein the display panel is arranged on the other side of the diffusion plate away from the light-emitting component.

[0020] In some embodiments, the display panel includes a pixel array, the pixel array includes a plurality of pixels; the plurality of pixels are arranged into a plurality of pixel rows along a first direction, and a plurality of pixel columns along a second direction; wherein the first direction intersects with the second direction; the aperture ratio of all pixels in the pixel row gradually decreases from a first edge of the pixel array toward a direction close to a middle area; the first edge of the pixel array is parallel to the first direction; the aperture ratio of all pixels in the pixel column gradually decreases from a second edge of the pixel array toward a direction close to the middle area; and the second edge of the pixel array is parallel to the second direction.

[0021] In some embodiments, the aperture ratio of a pixel satisfies the following formula: m=-0.027㏑(n)+0.6994; wherein m is the aperture ratio of the pixel, and n is the number of pixels at the corresponding edge of the pixel.

[0022] In some embodiments, the display panel includes an array substrate and a matching substrate that is matched with the array substrate, and a liquid crystal layer is provided between the array substrate and the matching substrate; the matching substrate includes a first substrate and a shading structure located on the first substrate; the width of the shading structure in the middle area is greater than the width of the shading structure in the edge area.

[0023] In some embodiments, the width of the light shielding structure is greater than or equal to 117 μm and less than or equal to 139.4 μm.

[0024] In some embodiments, the display panel includes an array substrate and a mating substrate that is mating with the array substrate, and a liquid crystal layer is provided between the array substrate and the mating substrate; the array substrate includes a second substrate and a scan line layer located on the second substrate; the width of the scan line layer in the middle area is greater than the width of the scan line layer in the edge area.

[0025] In some embodiments, the width of the scan line layer is greater than or equal to 60 μm and less than or equal to 80 μm.

[0026] In some embodiments, the array substrate further includes a common electrode line layer on the second substrate, and the spacing between the orthographic projections of the common electrode line layer and the scanning line layer in the middle region on the second substrate is greater than the spacing between the orthographic projections of the common electrode line layer and the scanning line layer in the edge region on the second substrate.

[0027] In some embodiments, the array substrate also includes a first electrode and a second electrode located on the second substrate, the second electrode being located on a side of the first electrode facing away from the second substrate; the spacing between the first electrode in the middle region and the orthographic projection of the scanning line layer on the second substrate is equal to the spacing between the first electrode in the edge region and the orthographic projection of the scanning line layer on the second substrate; the spacing between the second electrode in the middle region and the orthographic projection of the scanning line layer on the second substrate is equal to the spacing between the second electrode in the edge region and the orthographic projection of the scanning line layer on the second substrate. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 FIG. 1 is a schematic diagram of the brightness at various locations on a diffusion plate in the related art.

[0029] Figure 2 It is a schematic diagram of the relative positions of a diffusion plate and a light-emitting component of a backlight module according to an embodiment of the present invention.

[0030] Figure 3 It is a top view showing the relative positional relationship between the middle area and the edge area of ​​a diffuser plate according to an embodiment of the present invention.

[0031] Figure 4 It is a top view of the relative positional relationship between the middle area and the edge area of ​​a diffuser plate according to another embodiment of the present invention.

[0032] Figure 5 It is a schematic diagram of the brightness at various locations on a diffusion plate according to an embodiment of the present invention.

[0033] Figure 6 It is a schematic diagram of the diffusion path of part of the light in the diffusion plate of the backlight module in the related art.

[0034] Figure 7 It is a schematic diagram of the diffusion path of part of the light in the diffusion plate of the backlight module according to one embodiment of the present invention.

[0035] Figure 8 Schematic diagram of a display panel of a display device according to an embodiment of the present invention.

[0036] Fig. 9 It is a schematic diagram of the brightness of various positions of a display panel according to an embodiment of the present invention.

[0037] Fig.10 It is a schematic structural diagram of a display panel in a middle area according to an embodiment of the present invention.

[0038] Fig.11 It is a schematic structural diagram of the edge region of the display panel according to the embodiment of the present invention.

[0039] Explanation of symbols:

[0040] 200, backlight module;

[0041] 210, diffuser plate;

[0042] 211, middle area; 211a, third area; 211b, fourth area;

[0043] 212, edge region; 212a, first region; 212b, second region;

[0044] 220, light-emitting component; 221, light-emitting body;

[0045] 311, first substrate; 312, light shielding structure;

[0046] 321, second substrate; 322, scanning line layer; 323, common electrode line layer; 324, first electrode; 325, second electrode. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] The shapes and sizes of the components in the drawings do not reflect the actual proportions, and are only intended to facilitate understanding of the contents of the embodiments of the present invention.

[0049] Unless otherwise defined, the technical terms or scientific terms used in the present disclosure should be understood by people with ordinary skills in the field to which the present disclosure belongs. The "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, similar words such as "one", "one" or "the" do not indicate quantity restrictions, but indicate that there is at least one. Similar words such as "include" or "comprise" mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Similar words such as "connect" or "connected" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0050] The embodiments of the present disclosure are not limited to the embodiments shown in the drawings, but include modifications of the configurations formed based on the manufacturing process. Therefore, the regions illustrated in the drawings have schematic properties, and the shapes of the regions shown in the drawings illustrate the specific shapes of the regions of the elements, but are not intended to be limiting.

[0051] The backlight module 200 includes a diffuser plate 210 and a light-emitting component 220. The light-emitting component 220 may include a plurality of light-emitting bodies 221 arranged in an array, wherein a single light-emitting body 221 may be an LED. The light-emitting component 220 is located on the light-incident side of the diffuser plate 210, and the light emitted by the light-emitting component 220 passes through the diffuser plate 210 and is refracted inside the diffuser plate 210. For the diffuser plate 210, due to the position limitation of the light-emitting component 220, the brightness at the edge of the diffuser plate 210 is darker than the brightness at the center, that is, the overall brightness of the diffuser plate 210 is not uniform, and the difference between light and dark is obvious. The darker brightness area at the edge of the diffuser plate 210 can be called a "shadow area". Since the sizes of display devices in different fields are different, the sizes of the shadow areas are also different. For the convenience of explanation, this embodiment takes the spliced ​​screen of the eye-sensing light field display (ELFD) as an example, and the following display device is a display screen unit of the spliced ​​screen.

[0052] Figure 1 is a schematic diagram of the brightness of various locations on the diffusion plate of the related art. Figure 1, the horizontal axis represents the distance from the edge of the diffuser plate 210, and the vertical axis represents the brightness. It can be understood that the larger the value in the vertical axis, the brighter the brightness. The inventors of the present disclosure have tested and found that the brightness on the diffuser plate 210 starts to decrease from a position 20 mm away from the edge, and drops rapidly at a position 10 mm away from the edge. That is, there is a large difference between the brightness of the normal brightness area and the brightness of the shadow area on the diffuser plate 210, which causes the shadow area to be darker than the normal brightness area. This is reflected in the spliced ​​screen of the eye-sensing light field display, that is, the splicing seam is larger (there is a shadow area on the diffuser plate 210 of a single display unit), which affects the final display effect. Through the above tests, it can be known that the width of the shadow area is generally 0 to 20 mm.

[0053] In order to solve the above technical problems, the present application proposes a backlight module 200, which can reduce the brightness difference between the middle area 211 and the edge area 212 of the diffuser 210, improve the uniformity of the brightness on the diffuser 210, and further improve the final display effect.

[0054] Figure 2 Schematic diagram of the relative positions of the diffusion plate 210 and the light emitting component 220 of the backlight module 200 according to an embodiment of the present invention. Figure 2 , which shows a backlight module 200 of a design solution. Figure 2 As shown, the diffuser plate 210 in the present disclosure may include a middle area 211 and an edge area 212, and the edge area 212 is arranged around the middle area 211. At this time, the edge area 212 is the above-mentioned dark shadow area. For a display screen unit of the eye-sensing light field display, the width of the edge area 212 perpendicular to its edge direction is c, the minimum distance between the orthographic projection of the light emitting body 221 at the edge of the light emitting component 220 on the diffuser plate 210 and the edge of the diffuser plate 210 is a, and the spacing between adjacent light emitting components 220 is b, where c=a+b. For details, please refer to Figure 1 .

[0055] Example 1

[0056] Specifically, an ink layer is disposed on the surface of the diffusion plate 210 in this embodiment that is away from the light emitting component 220 , and the unit ink volume of the ink layer in the middle area 211 is greater than the unit ink volume of the ink layer in the edge area 212 .

[0057] In this embodiment, the unit ink volume of the ink layer in the middle area 211 is set to be greater than the unit ink volume of the ink layer in the edge area 212, so as to achieve non-uniform ink printing on the entire diffuser 210, reduce the unit ink volume at the edge area 212 on the diffuser 210, and then improve the transmittance of the edge area 212 of the diffuser 210, thereby improving the brightness of the edge area 212 on the diffuser 210. It can be understood that in this embodiment, the edge area 212 is defined as a dark shadow area, so in this embodiment, the brightness of the dark shadow area can be improved to solve the above technical problems.

[0058] Figure 3 FIG. 2 is a top view of the relative positional relationship between the middle area 211 and the edge area 212 of the diffuser 210 according to an embodiment of the present invention. Figure 3 In this embodiment, the edge region 212 is arranged around the middle region 211. The edge region 212 includes a plurality of first regions 212a and a plurality of second regions 212b, and at least one side of the first region 212a is adjacent to the middle region 211. In some embodiments, the edge region 212 includes four first regions 212a and four second regions 212b, wherein the second regions 212b are four regions located at the four corners of the edge region 212. For details, please refer to Figure 3 .

[0059] Since the brightness of the first area 212a and the second area 212b in the edge area 212 is also different, the brightness of the second area 212b is lower than that of the first area 212a. Therefore, the unit ink volume of the ink layer in the first area 212a is greater than or equal to the unit ink volume of the ink layer in the second area 212b, so that the transmittance of the first area 212a is less than the transmittance of the second area 212b, and the brightness difference between the first area 212a and the second area 212b in the edge area is reduced.

[0060] In this embodiment, the unit ink volume of the ink layer in the middle area 211 is the same everywhere, the unit ink volume of the ink layer in the second area 212b is the same everywhere, and the unit ink volume of the ink layer in the middle area 211 is greater than the unit ink volume of the ink layer in the second area 212b, so that the transmittance of the middle area 211 is less than the transmittance of the second area 212b. For example, the transmittance of the middle area 211 can be 75%, and the transmittance of the second area 212b can be 80%.

[0061] In some embodiments, the unit ink volume of the ink layer in the middle region 211 is twice the unit ink volume of the ink layer in the second region 212b.

[0062] The unit ink usage of the ink layer in the first area 212 a may be set to change gradually. For example, the unit ink usage of the ink layer in the first area 212 a may gradually increase from the edge of the diffusion plate 210 toward the middle area 211 .

[0063] The unit ink usage of the ink layer in the first area 212a meets the following formula: y=0.35x 2 -2.15x+51.75, wherein x is the distance from the edge of the diffusion plate 210, and y is the unit ink usage.

[0064] In the first area 212a, the relationship between the ink ratio and the transmittance is in accordance with: u = 0.1v + 0.7, where u in the above relationship represents the transmittance and v represents the ink ratio. The ink ratio can be understood as the ratio of the unit ink volume to the middle area 211. For example, if the second area 212b is 50 and the middle area 211 is 100, then the ink ratio of the second area 212b is 50:100, which is 0.5. In this embodiment, there is a relationship between the ink ratio in the first area 212a and the distance from the edge of the diffuser plate 210, where the relationship between the ink ratio and the distance from the edge of the diffuser plate 210 is in accordance with: p = 0.0004q 2 -0.0022q+0.7518, wherein q is the distance from the edge of the diffusion plate 210, and p is the ink ratio.

[0065] After experimental verification, this embodiment can significantly improve the brightness of the diffuser 210 at 15 to 20 mm from the edge, and can also appropriately improve the brightness of the diffuser 210 at 0 to 5 mm from the edge. The edge area 212 is 0 to 20 mm from the edge, that is, this embodiment can effectively improve the brightness of the edge area 212 and reduce the brightness difference between the middle area 211 and the edge area 212. It can be understood that if you want to more significantly improve the brightness of the diffuser 210 at 0 to 5 mm from the edge, you can increase the current of the light emitter 221 at 0 to 5 mm from the edge of the diffuser 210 according to actual conditions.

[0066] Figure 4 FIG. 2 is a top view of the relative position relationship between the middle area 211 and the edge area 212 of the diffuser 210 according to another embodiment of the present invention. Figure 4 , the middle area 211 can be further divided into a third area 211a and a fourth area 211b, and the unit ink volume of the ink layer in the third area 211a is set to be greater than the unit ink volume of the ink layer in the fourth area 211b. By finely dividing the diffuser plate 210 in this embodiment, the transmittance of each area on the diffuser plate 210 can be better controlled, and the uniformity of the brightness on the diffuser plate 210 can be improved.

[0067] Example 2

[0068] The light-emitting component 220 includes multiple light-emitting bodies 221, which are used to emit light toward the diffuser 210 after being powered on, wherein each light-emitting body 221 can be an LED or other light-emitting device that can emit light, and no specific limitation is made here, that is, the light-emitting component 220 includes multiple LEDs, and the light emitted by the light-emitting body 221 is refracted in the diffuser 210.

[0069] The plurality of light emitters 221 include a first light emitting group and a second light emitting group. The first light emitting group corresponds to the middle area 211 of the diffuser 210, and the second light emitting group corresponds to the edge area 212 of the diffuser 210. In some embodiments, the current intensity of the second light emitting group is greater than the current intensity of the first light emitting group.

[0070] In this embodiment, the current of the light emitting body 221 corresponding to the edge area 212 of the diffusion plate 210 is enhanced to reduce the difference in brightness between the middle area 211 and the edge area 212 .

[0071] The edge region 212 includes a plurality of first regions 212a and a plurality of second regions 212b, and at least one side of the first region 212a is adjacent to the middle region 211. In some embodiments, the edge region 212 includes four first regions 212a and four second regions 212b, wherein the second regions 212b are four regions located at four corners of the edge region 212. For details, please refer to Figure 3 .

[0072] Since the brightness of the first area 212a and the second area 212b in the edge area 212 is also different, the brightness of the second area 212b is lower than that of the first area 212a. In this embodiment, the second light-emitting group includes a first subgroup corresponding to the first area 212a and a second subgroup corresponding to the second area 212b. The current intensity of the first subgroup is less than that of the second subgroup, so as to further subdivide the current intensity of the light emitters 221 corresponding to different brightness areas in the edge area 212.

[0073] Further, the middle area 211 includes a third area 211a and a fourth area 211b arranged around the third area 211a. Figure 4 The first light emitting group includes a third subgroup corresponding to the third region 211 a and a fourth subgroup corresponding to the fourth region 211 b , and the current intensity of the third subgroup is smaller than the current intensity of the fourth subgroup.

[0074] In some embodiments, the current intensity of the light emitting assembly 220 can be set in steps, for example, the ratio of the current intensity of the third subgroup, the current intensity of the fourth subgroup, the current intensity of the first subgroup and the current intensity of the second subgroup is 65%: 81.25%: 93.75%: 100%. In other words, the ratio of the current intensity of the third subgroup, the current intensity of the fourth subgroup, the current intensity of the first subgroup and the current intensity of the second subgroup is 52: 65: 75: 80.

[0075] Specifically, Figure 4 The size of the second area 212b can be set to the area occupied by one partition, and the widths of the first area 212a and the fourth area 211b are both the widths occupied by one partition. The above-mentioned one partition can be understood as 2 horizontal and 3 rows of LED lights, 6 pixels in size, and the size is about 14*8.

[0076] Figure 5 FIG. 2 is a schematic diagram of the brightness of various locations on the diffuser plate 210 according to an embodiment of the present invention. Figure 5 , the horizontal axis represents the distance from the edge of the diffuser plate 210, and the vertical axis represents the brightness. It can be understood that the larger the value in the vertical axis, the brighter it is. The inventors of the present disclosure have tested and found that when the ratio of the current intensity of the third subgroup, the current intensity of the fourth subgroup, the current intensity of the first subgroup and the current intensity of the second subgroup is 52:65:75:80, the brightness on the diffuser plate 210 starts to decrease from the position 10mm away from the edge, and drops rapidly at the position 5mm away from the edge, which is significantly lower than that of the related art ( Figure 2 ) shows the brightness change from the middle area 211 to the edge area 212 (0-20 mm). The brightness difference between the portion of the edge area 212 close to the middle area 211 and the middle area 211 is smaller, thus shortening the brightness difference between the middle area 211 and the edge area 212.

[0077] That is, after experimental verification, the present embodiment can significantly improve the brightness at 10 to 20 mm from the edge of the diffuser 210, and can also appropriately improve the brightness at 0 to 10 mm from the edge of the diffuser 210. It is understandable that if the brightness at 0 to 10 mm from the edge of the diffuser 210 is to be more significantly improved, the current of the light-emitting body 221 at 0 to 10 mm from the edge of the diffuser 210 can be increased according to actual conditions.

[0078] Example 3

[0079] The backlight module 200 further includes a reflector disposed outside the diffuser 210 . The reflector is used to collect the light emitted by the light emitting assembly 220 that does not enter the diffuser 210 , and reflect the collected light to the edge region 212 to increase the brightness of the edge region 212 .

[0080] In this embodiment, the brightness of the edge area 212 is increased by adding a emitting element, thereby shortening the difference in brightness between the middle area 211 and the edge area 212 .

[0081] In some embodiments, the reflective member may be a diffuse reflective strip.

[0082] Preferably, the reflectivity of the reflector is 80% to 95%.

[0083] In some embodiments, the light-emitting surface of the reflective film is connected to the side wall of the diffuser plate 210 by an adhesive. For example, the two ends of the light-emitting surface of the reflective film can be tightly attached to the side wall of the diffuser plate 210 by an adhesive. For example, it can be fixed to the side wall of the diffuser plate 210 by a double-sided adhesive. The required peeling force for the reflective film to be tightly attached to the diffuser plate 210 is 12 to 35 N / 25 mm.

[0084] Example 4

[0085] It is understandable that the existence of the shadow area on the diffuser plate 210 is because the light emitting component 220 emits less light toward the edge of the diffuser plate 210, so the diffusion path of the light emitted by the light emitting component 220 in the diffuser plate 210 will affect the width of the shadow area.

[0086] Figure 6 Schematic diagram of the diffusion path of part of the light in the diffusion plate 210 of the backlight module 200 of the related art. Figure 6 The one-way arrow in the figure represents a beam of light emitted by the light emitting component 220, wherein the exit point of the beam of light on the diffuser 210 is the junction of the edge area 212 and the middle area 211. The beam of light passes through two fold lines and reaches the side of the diffuser 210 away from the light emitting component 220. Figure 6 The gray shaded area in the edge region 212 represents the darker area in the edge region 212. Figure 6 Wherein H represents the thickness of the diffusion plate 210, L represents the width of the gray shadow area, W represents the distance from the incident point of the light beam to the edge area 212, θ represents the incident angle of the light beam, and α represents the refraction angle of the light beam.

[0087] In order to solve the above technical problems, this embodiment reduces the width of the darker area in the edge area 212 and improves the thickness of the diffusion plate 210 .

[0088] Figure 7 FIG. 2 is a schematic diagram of a diffusion path of part of the light in the diffusion plate 210 of the backlight module 200 according to an embodiment of the present invention. Figure 7 In this embodiment, the brightness of the edge region 212 of the diffuser 210 is increased by increasing the thickness of the diffuser 210. It should be noted that: Figure 7 The diffuser plate 210 in Figure 6 The diffusion plate 210 in the embodiment has only its thickness improved, that is, the incident point of the light (the point where the light enters the diffusion plate 210 on the light incident side is the incident point) is the same. It can be understood that, when the incident point is the same, due to the increase in the thickness of the diffusion plate 210, the transmission path of the light in the diffusion plate 210 is increased, which also changes the exit point of the light (the point where the light leaves the diffusion plate 210 on the other side of the diffusion plate 210 is the exit point), increases W, and since the sum of (W+L) remains unchanged, L decreases, which shortens the width of the darker area in the edge area 212.

[0089] In some embodiments, the thickness of the diffuser plate 210 is greater than or equal to 1.1 mm and less than or equal to 3 mm.

[0090] Generally speaking, the relationship between the above W and H satisfies: W = H × sin α.

[0091] The normal incident angle θ is 70 to 80°, the glass refractive index n is 1.5 to 1.7, and therefore α is 33 to 41°.

[0092] When the thickness H of the diffusion plate 210 is 1.1 mm, W is approximately 0.6-0.72 mm, and the width L of the gray shaded area is approximately 4 mm.

[0093] When the thickness H of the diffusion plate 210 is 3 mm, W is approximately 1.6 to 2 mm, and the width L of the gray shaded area is approximately 2.72 to 3 mm.

[0094] It should be noted that the thickness of the diffusion plate 210 will affect the brightness loss, and the two are in direct proportion, that is, the increase in the thickness of the diffusion plate 210 will increase the brightness loss.

[0095] Generally speaking, the relationship between transmittance and the thickness of the diffuser 210 is: -㏒(transmittance)=K*H, where K is a constant and H is the thickness of the diffuser 210. The K of the commonly used diffuser 210 is 46.

[0096] When the thickness H of the diffusion plate 210 is 1.1 mm, the transmittance is approximately 89%.

[0097] When the thickness H of the diffusion plate 210 is 3 mm, the transmittance is approximately 72%.

[0098] When the thickness H of the diffuser plate 210 increases to 6.1-7.4 mm, the brightness of the entire edge region 212 can be made the same as that of the middle region 211, that is, the shadow region problem is completely solved, but the light efficiency is low at this time, and the transmittance is 46%-52%. Therefore, considering both the edge region 212 and the light efficiency, the optimal thickness of the diffuser plate 210 is 1.1-3 mm.

[0099] Example 5

[0100] The display device includes a display panel and a backlight module 200 disposed on the back side of the display panel. The backlight module 200 is a direct-down type. The direct-down type backlight module 200 includes a diffuser 210 opposite to the back side of the display panel and a light-emitting component 220 located on the side of the diffuser 210 away from the display panel, that is, the display panel is disposed on the other side of the diffuser 210 away from the light-emitting component 220. The diffuser 210 and the light-emitting component 220 are arranged at intervals. It should be noted that the display device may also include a back plate for arranging the light-emitting component 220. The back plate is located on the side of the diffuser 210 away from the display panel. The back plate and the diffuser 210 are stacked and arranged at intervals. The light-emitting component 220 is arranged on the surface of the back plate close to the diffuser 210. A diffuser 210 bracket may also be installed between the back plate and the diffuser 210. The specific structure of the diffuser 210 bracket has been disclosed in the art and will not be repeated here.

[0101] Figure 8 Schematic diagram of a display panel of a display device according to an embodiment of the present invention. Figure 8 The display panel includes a pixel array, and the pixel array includes a plurality of pixels.

[0102] The plurality of pixels are arranged into a plurality of pixel rows along a first direction and a plurality of pixel columns along a second direction; wherein the first direction intersects with the second direction.

[0103] The aperture ratios of all pixels in the pixel row gradually decrease from the first edge of the pixel array toward the middle region 211 , wherein the first edge of the pixel array is parallel to the first direction.

[0104] The aperture ratios of all pixels in the pixel row gradually decrease from the second edge of the pixel array toward the middle region 211 , wherein the second edge of the pixel array is parallel to the second direction.

[0105] It can be understood that the display panel can be a display screen or a liquid crystal display screen.

[0106] Fig. 9 Schematic diagram of brightness at various locations on a display panel according to an embodiment of the present invention. Fig. 9, the horizontal axis represents the distance from the edge of the diffuser plate 210, and the vertical axis represents the brightness. It can be understood that the larger the value in the vertical axis, the brighter it is. The inventor of the present disclosure has tested and found that the brightness on the diffuser plate 210 in this embodiment starts to decrease from a position about 7 mm away from the edge, and drops rapidly at a position 2 mm away from the edge. Compared with the related art ( Figure 2 ) shows the brightness change from the middle area 211 to the edge area 212 (0-20 mm). The brightness difference between the portion of the edge area 212 close to the middle area 211 and the middle area 211 is smaller, thus shortening the brightness difference between the middle area 211 and the edge area 212.

[0107] In this embodiment, the pixel opening of the display panel is adjusted so that the pixel transmittance of the edge area 212 is gradually increased, so that the brightness of the edge area 212 is increased, thereby achieving the purpose of reducing the brightness difference between the middle area 211 and the edge area 212.

[0108] The pixel aperture ratio conforms to the following formula:

[0109] m=-0.027㏑(n)+0.6994;

[0110] Wherein, m is the aperture ratio of the pixel, and n is the number of pixels from the pixel to the corresponding edge (wherein one pixel includes three sub-pixels).

[0111] For example, when n=1, m=70%; when n=2, m=68.3%; when n=3, m=66.7%; when n=4, m=66%; when n=5, m=65.5%; when n=6, m=65.2%; when n=7, m=65%. It should be noted that the above formula for pixel aperture ratio is a fitting formula, so when the above distance value is substituted into the formula, there will be some deviation, which is normal.

[0112] It should be noted that the aperture ratio of the pixel can be reduced by increasing the thickness of the black matrix layer corresponding to the pixel or the thickness of the scanning line layer 322 .

[0113] Fig.10 It is a schematic structural diagram of a display panel in a middle area 211 according to an embodiment of the present invention. Fig.11 2 is a schematic structural diagram of a display panel at an edge region 212 according to an embodiment of the present invention. Fig.10 and Fig.11 The display panel includes an array substrate and a matching substrate that is matched with the array substrate, and a liquid crystal layer is provided between the array substrate and the matching substrate. The matching substrate includes a first substrate 311 and a light shielding structure 312 located on the first substrate 311, wherein the light shielding structure 312 may be a black matrix layer.

[0114] In some embodiments, the width of the shading structure 312 in the middle area 211 is greater than the width of the shading structure 312 in the edge area 212, so that the aperture ratio of the middle area 211 is smaller than the aperture ratio of the edge area 212, thereby improving the brightness of the edge area 212 and achieving the purpose of shortening the width of the edge area 212.

[0115] Specifically, the width of the light shielding structure 312 is greater than or equal to 117 μm and less than or equal to 139.4 μm.

[0116] See also Fig.10 and Fig.11 The display panel includes an array substrate and a pairing substrate that is paired with the array substrate, and a liquid crystal layer is disposed between the array substrate and the pairing substrate. The array substrate includes a second substrate 321 and a scan line layer 322 located on the second substrate 321.

[0117] In some embodiments, the width of the scanning line layer 322 in the middle area 211 is greater than the width of the scanning line layer 322 in the edge area 212, so that the aperture ratio of the middle area 211 is smaller than the aperture ratio of the edge area 212, so that the brightness of the edge area 212 is improved, thereby achieving the purpose of reducing the brightness difference between the edge area 212 and the middle area 211.

[0118] Specifically, the width of the scan line layer 322 is greater than or equal to 60 μm and less than or equal to 80 μm.

[0119] The spacing between the orthographic projections of the common electrode line layer 323 and the scanning line layer 322 in the middle region 211 on the second substrate 321 is greater than the spacing between the orthographic projections of the common electrode line layer 323 and the scanning line layer 322 in the edge region 212 on the second substrate 321. Fig.10 and Fig.11 The array substrate further includes a common electrode line layer 323 located on the second substrate 321, and the spacing between the common electrode line layer 323 and the scanning line layer 322 in the middle area 211 and the orthographic projection on the second substrate 321 is Fig.10 and Fig.11 In the figure, it is represented as r1, and the distance between the orthographic projections of the common electrode line layer 323 and the scanning line layer 322 in the edge region 212 on the second substrate 321 is Fig.10 and Fig.11 Expressed as r2, then r1>r2.

[0120] See also Fig.10 and Fig.11 The array substrate further includes a first electrode 324 and a second electrode 325 located on the second substrate 321 , and the second electrode 325 is located on a side of the first electrode 324 away from the second substrate 321 .

[0121] The distance between the orthographic projections of the first electrode 324 and the scan line layer 322 on the second substrate 321 in the middle region 211 is equal to the distance between the orthographic projections of the first electrode 324 and the scan line layer 322 on the second substrate 321 in the edge region 212 .

[0122] The distance between the first electrode 324 in the middle area 211 and the orthographic projection of the scanning line layer 322 on the second substrate 321 is Fig.10 and Fig.11 In the figure, it is represented as s1, and the distance between the first electrode 324 in the edge region 212 and the orthographic projection of the scanning line layer 322 on the second substrate 321 is Fig.10 and Fig.11 If it is represented as s2, then s1=s2.

[0123] The spacing between the orthographic projections of the second electrode 325 and the scan line layer 322 on the second substrate 321 in the middle region 211 is equal to the spacing between the orthographic projections of the second electrode 325 and the scan line layer 322 on the second substrate 321 in the edge region 212 .

[0124] The distance between the second electrode 325 in the middle region 211 and the orthographic projection of the scanning line layer 322 on the second substrate 321 is Fig.10 and Fig.11 In the figure, it is represented as t1, and the distance between the second electrode 325 in the edge region 212 and the orthographic projection of the scanning line layer 322 on the second substrate 321 is Fig.10 and Fig.11 If it is represented as t2, then t1=t2.

[0125] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, but the present invention is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A backlight module, characterized in that: It includes a diffusion plate and a light-emitting component located on the light-incident side of the diffusion plate, wherein the light-emitting component includes a plurality of light-emitting bodies arranged in an array; The diffusion plate includes a middle area and an edge area surrounding the middle area, the width of the edge area perpendicular to the edge direction thereof is c, the minimum distance between the orthographic projection of the light-emitting body at the edge of the light-emitting assembly on the diffusion plate and the edge of the diffusion plate is a, and the spacing between adjacent light-emitting assemblies is b, wherein c=a+b; Wherein, an ink layer is arranged on a surface of the diffusion plate facing away from the light-emitting component, and a unit ink volume of the ink layer in the middle area is greater than a unit ink volume of the ink layer in the edge area.

2. The backlight module according to claim 1, characterized in that: The edge area includes a plurality of first areas and a plurality of second areas, and at least one side of the first area is adjacent to the middle area; The unit ink volume of the ink layer in the first area is greater than or equal to the unit ink volume of the ink layer in the second area.

3. The backlight module according to claim 2, characterized in that: The unit ink volume of the ink layer in the middle area is the same everywhere, and the unit ink volume of the ink layer in the second area is the same everywhere; The unit ink volume of the ink layer in the middle region is twice the unit ink volume of the ink layer in the second region.

4. The backlight module according to claim 2, characterized in that: The unit ink usage of the ink layer in the first area gradually increases from the edge of the diffusion plate toward the middle area.

5. The backlight module according to claim 2, characterized in that: The unit ink usage of the ink layer in the first area meets the following formula: y=0.35x 2 -2.15x+51.75, wherein x is the distance from the edge of the diffusion plate, and y is the unit ink usage.

6. The backlight module according to claim 1, characterized in that: The light-emitting assembly includes a plurality of light-emitting bodies, and the light-emitting bodies are used to emit light to the diffusion plate after being powered on; The plurality of light-emitting bodies include a first light-emitting group corresponding to the middle area and a second light-emitting group corresponding to the edge area, and the current intensity of the second light-emitting group is greater than the current intensity of the first light-emitting group.

7. The backlight module according to claim 6, characterized in that: The edge area includes a plurality of first areas and a plurality of second areas, and at least one side of the first area is adjacent to the middle area; The second light-emitting group includes a first subgroup corresponding to the first area and a second subgroup corresponding to the second area, and a current intensity of the first subgroup is smaller than a current intensity of the second subgroup.

8. The backlight module according to claim 7, characterized in that: The middle area includes a third area and a fourth area arranged around the third area; The first light-emitting group includes a third subgroup corresponding to the third area and a fourth subgroup corresponding to the fourth area, and a current intensity of the third subgroup is smaller than a current intensity of the fourth subgroup.

9. The backlight module according to claim 8, characterized in that: The ratio of the current intensity of the third subgroup, the current intensity of the fourth subgroup, the current intensity of the first subgroup and the current intensity of the second subgroup is 52:65:75:

80.

10. The backlight module according to claim 1, characterized in that: The backlight module also includes: A reflector is arranged on the outer side of the diffusion plate, and is used to collect the light emitted by the light-emitting component but not entering the interior of the diffusion plate, and reflect the collected light to the edge area to increase the brightness of the edge area.

11. The backlight module according to claim 10, characterized in that: The reflectivity of the reflector is 80% to 95%.

12. The backlight module according to claim 1, characterized in that: The thickness of the diffusion plate is greater than or equal to 1.1 mm and less than or equal to 3 mm.

13. A display device, characterized in that: It comprises a display panel and a backlight module as claimed in any one of claims 1 to 12, wherein the display panel is arranged on the other side of the diffusion plate away from the light-emitting component.

14. The display device according to claim 13, characterized in that: The display panel includes a pixel array, the pixel array includes a plurality of pixels; the plurality of pixels are arranged into a plurality of pixel rows along a first direction and a plurality of pixel columns along a second direction; wherein the first direction intersects with the second direction; The aperture ratio of all pixels in the pixel row gradually decreases from the first edge of the pixel array toward the middle area; the first edge of the pixel array is parallel to the first direction; The aperture ratios of all pixels in the pixel column gradually decrease from the second edge of the pixel array toward the middle area; the second edge of the pixel array is parallel to the second direction.

15. The display device according to claim 14, characterized in that: The aperture ratio of the pixel complies with the following formula: m=-0.027㏑(n)+0.6994; Among them, m is the aperture ratio of the pixel, and n is the number of pixels corresponding to the edge of the pixel distance.

16. The display device according to claim 13, characterized in that: The display panel comprises an array substrate and a cell-matching substrate arranged in a cell-matching manner with the array substrate, and a liquid crystal layer is arranged between the array substrate and the cell-matching substrate; The box-matching substrate comprises a first substrate and a light shielding structure located on the first substrate; The width of the light shielding structure in the middle area is greater than the width of the light shielding structure in the edge area.

17. The display device according to claim 16, characterized in that: The width of the light shielding structure is greater than or equal to 117 μm and less than or equal to 139.4 μm.

18. The display device according to claim 13, characterized in that: The display panel comprises an array substrate and a cell-matching substrate arranged in a cell-matching manner with the array substrate, and a liquid crystal layer is arranged between the array substrate and the cell-matching substrate; The array substrate comprises a second substrate and a scan line layer located on the second substrate; The width of the scan line layer in the middle area is greater than the width of the scan line layer in the edge area.

19. The display device according to claim 18, characterized in that The width of the scanning line layer is greater than or equal to 60 μm and less than or equal to 80 μm.

20. The display device according to claim 18, characterized in that The array substrate also includes a common electrode line layer located on the second substrate, and the spacing between the orthographic projections of the common electrode line layer and the scanning line layer on the second substrate in the middle area is greater than the spacing between the orthographic projections of the common electrode line layer and the scanning line layer on the second substrate in the edge area.

21. The display device according to claim 18, characterized in that The array substrate further comprises a first electrode and a second electrode located on the second substrate, wherein the second electrode is located on a side of the first electrode away from the second substrate; The distance between the first electrode and the orthographic projection of the scanning line layer on the second substrate in the middle region is equal to the distance between the first electrode and the orthographic projection of the scanning line layer on the second substrate in the edge region; The spacing between the second electrode and the orthographic projection of the scan line layer on the second substrate in the middle region is equal to the spacing between the second electrode and the orthographic projection of the scan line layer on the second substrate in the edge region.

Images