Backlight module and display equipment

Abstract

The invention discloses a backlight module and display equipment, the backlight module comprises a light source assembly and a light guide plate, the light source assembly comprises a substrate and a plurality of light emitting parts, one side plate surface of the substrate is a setting surface, the plurality of light emitting parts are arranged on the setting surface at intervals, the light emitting parts can simultaneously emit light of various colors, and the light guide plate is arranged on the substrate. The light guide plate is arranged on one side, deviating from the setting surface, of the light emitting parts, D is more than 2mm and less than or equal to 2 * K * H * tan (theta / 2), D is the center distance between two adjacent light emitting parts along the arrangement direction of the plurality of light emitting parts, K is a light source coefficient, H is the distance between the light guide plate and the setting surface, theta is the half-peak light emitting angle of the light emitting parts, light emitted from the light guide plate has CIE chromaticity (x, y), 0.18 < = x < = 0.35, 0.18 < = y < = 0.35, and 0.18 < = y < = 0.35. According to the backlight module, a better light mixing effect can be achieved, and the color cast problem of light rays emitted by the backlight module is small.

Description

TECHNICAL FIELD

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

[0002] The backlight module of the display device usually uses a light emitting piece capable of emitting multiple colors of light at the same time, and then makes the multiple color light emitted by the light emitting piece propagate and mix in the light guide plate to form a backlight source of approximately white color.

[0003] In order to save the material cost of the backlight module, the number of light emitting pieces included in the backlight module is as small as possible in the related art while ensuring the light emitting brightness requirement of the backlight module. However, such a setting causes the center distance of the light emitting pieces to be large in the related art, and the backlight module often has the problem that the mixing of the multiple color light emitted by the light emitting pieces in the light guide plate is insufficient, resulting in the problem of color deviation of the light emitted by the backlight module in some areas. SUMMARY

[0004] A first object of the present application is to provide a backlight module capable of achieving better light mixing effect and having less color deviation of the light emitted by the backlight module.

[0005] A second object of the present application is to provide a display device capable of achieving better display effect by using the aforementioned backlight module.

[0006] To achieve the above objects, the present application adopts the following technical solutions:

[0007] In a first aspect, a backlight module is provided, comprising:

[0008] a light source assembly, the light source assembly comprising a substrate and a plurality of light emitting pieces, one side surface of the substrate being a setting surface, the plurality of light emitting pieces being arranged on the setting surface at intervals, the light emitting pieces being capable of emitting multiple colors of light at the same time; and

[0009] a light guide plate, the light guide plate being arranged on a side of the light emitting pieces away from the setting surface;

[0010] 2mm < D ≤ 2×K×H×tan(θ / 2), where D is the center distance of two adjacent light emitting pieces in the arrangement direction of the plurality of light emitting pieces, K is a light source coefficient and 0.5 ≤ K ≤ 1.5, H is the distance between the light guide plate and the setting surface, and θ is the half peak light emitting angle of the light emitting piece;

[0011] The light emitted from the light guide plate has CIE chromaticity (x, y), 0.18 ≤ x ≤ 0.35, and 0.18 ≤ y ≤ 0.35.

[0012] In one of the embodiments, the light emitted from the light guide plate has CIE chromaticity (x, y), 0.24≤x≤0.33, 0.20≤y≤0.33.

[0013] In one of the embodiments, the light emitting member comprises a blue light chip, a green light chip and a red light excitation layer, the red light excitation layer covering at least the blue light chip.

[0014] In one of the embodiments, the light emitting member further comprises a bowl cup, the blue light chip and the green light chip are arranged in the bowl cup, and the red light excitation layer fills the bowl cup.

[0015] In one of the embodiments, the blue light chip emits blue light with a peak wavelength in the range of 440nm-470nm and a half wave width ≤25nm.

[0016] The green light chip emits green light with a peak wavelength in the range of 500nm-560nm and a half wave width ≤35nm.

[0017] In one of the embodiments, the ratio of the peak intensity of the blue light to the peak intensity of the green light is in the range of 1:1-5:1.

[0018] In one of the embodiments, the peak wavelength of the blue light is in the range of 447nm-465nm.

[0019] And / or, the peak wavelength of the green light is in the range of 520nm-530nm.

[0020] And / or, the ratio of the peak intensity of the blue light to the peak intensity of the green light is in the range of 1:1-3:1.

[0021] In one of the embodiments, a plurality of the light emitting members are arranged along a first direction, the light emitting member comprises one blue light chip and one green light chip, the blue light chip and the green light chip are arranged opposite along a second direction, and the relative positions of the blue light chip and the green light chip of adjacent two light emitting members along the second direction are opposite.

[0022] Wherein, the first direction and the second direction are both parallel to the setting surface, and the first direction and the second direction are perpendicular to each other.

[0023] In one of the embodiments, the plurality of light emitting pieces are arranged along a first direction, the light emitting pieces include two blue light chips and two green light chips, the two blue light chips and the two green light chips are arranged along the first direction and a second direction, and the two blue light chips are located at two opposite corners of one diagonal direction respectively, the two green light chips are located at two opposite corners of another diagonal direction respectively, and the arrangement positions of the blue light chips and the green light chips of all the light emitting pieces are the same.

[0024] The first direction and the second direction are parallel to the arrangement surface, and the first direction and the second direction are perpendicular to each other.

[0025] In one of the embodiments, the plurality of light emitting pieces are arranged along a first direction, the light emitting pieces include two blue light chips and two green light chips, the two blue light chips and the two green light chips are arranged along the first direction and a second direction, and the two blue light chips are located at two opposite corners of one diagonal direction respectively, the two green light chips are located at two opposite corners of another diagonal direction respectively, and the arrangement positions of the blue light chips and the green light chips of all the light emitting pieces are the same.

[0026] In one of the embodiments, the blue light chip and the green light chip of the light emitting piece are connected in series, or can be electrically connected to different driving circuits respectively.

[0027] In a second aspect, a display device is provided, which includes the backlight module as described in the first aspect.

[0028] The backlight module has the following advantages:

[0029] The backlight module can select a proper upper limit of the center distance D according to the half peak light emitting angle θ of the light emitting piece and the distance H between the arrangement surface and the light guide plate, so as to effectively improve the light mixing uniformity of the light emitting piece in the light guide plate, and the center distance D of the light emitting piece cannot be too small, so that the number of the light emitting pieces included in the light source assembly cannot be too large, thereby avoiding a sharp increase in the material cost of the light source assembly.

[0030] Furthermore, the multi-color light emitted by the light emitting piece can be mixed more uniformly in the light guide plate, so that the CIE chromaticity (x, y) of the light emitted from the light guide plate and having a good light mixing effect satisfies: 0.18≤x≤0.35, 0.18≤y≤0.35. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 A structure schematic view of the backlight module according to the embodiments;

[0032] Figure 2 A structure schematic view of the light emitting piece according to the embodiments;

[0033] Figure 3 Structure diagram of another light emitting component according to the embodiment;

[0034] Figure 4 Structure diagram of the first light source assembly according to the embodiment;

[0035] Figure 5 Structure diagram of the second light source assembly according to the embodiment;

[0036] Figure 6 Structure diagram of the third light source assembly according to the embodiment;

[0037] Figure 7 Partial diagram of the driving circuit of the light emitting component according to the embodiment.

[0038] In the drawings:

[0039] 1. Light source assembly; 10. Base plate; 100. Setting surface; 11. Light emitting component; 110. Blue light chip; 111. Green light chip; 112. Red light excitation layer; 113. Bowl cup; 114. Encapsulation glue structure;

[0040] 2. Light guide plate. DETAILED DESCRIPTION

[0041] The present application will be further described below in conjunction with the drawings and embodiments. It should be understood that the specific embodiments described herein are intended to serve only as an explanation of the present application and not as a limitation thereof. It should also be noted that, for the purpose of description, only the parts related to the present application are shown in the drawings and not all the parts.

[0042] In the description of the present application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood in a broad sense, for example, it can be fixedly connected, or detachably connected, or integrated; it can be mechanically connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0043] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature can include that the first and second features are in direct contact, or can include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature is "on", "above" and "over" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature is "under", "below" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0044] In the description of the present embodiment, the terms "upper", "lower", "right", "left", and other orientation or position relationships are based on the orientation or position relationship shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0045] As shown in Figure 1 The present embodiment provides a backlight module, which comprises a light source assembly 1 and a light guide plate 2. The light source assembly 1 comprises a substrate 10 and a plurality of light emitting pieces 11. One side surface of the substrate 10 is a setting surface 100. The plurality of light emitting pieces 11 are arranged at intervals on the setting surface 100. The light emitting pieces 11 can emit light of multiple colors simultaneously. The light guide plate 2 is arranged on the side of the light emitting pieces 11 away from the setting surface 100. 2mm < D ≤ 2×K×H×tan(θ / 2), where D is the center distance between two adjacent light emitting pieces 11 along the arrangement direction of the plurality of light emitting pieces 11, K is a light source coefficient and 0.5 ≤ K ≤ 1.5, H is the distance between the light guide plate 2 and the setting surface 100, and θ is the half-peak light emitting angle of the light emitting pieces 11. The light emitted from the light guide plate 2 has CIE chromaticity (x, y), 0.18 ≤ x ≤ 0.35, and 0.18 ≤ y ≤ 0.35.

[0046] By making the center distance D of the light emitting pieces 11 of the light source assembly 1 satisfy 2mm < D ≤ 2×K×H×tan(θ / 2), the upper limit of the center distance D can be selected according to the half-peak light emitting angle θ of the light emitting pieces 11 and the distance H between the setting surface 100 and the light guide plate 2, so as to effectively improve the light mixing uniformity of the light emitting pieces 11 in the light guide plate 2, while the center distance D of the light emitting pieces 11 will not be too small, so that the number of light emitting pieces 11 included in the light source assembly 1 will not be too large, thereby avoiding a substantial increase in the material cost of the light source assembly 1.

[0047] It should be noted that the light source coefficient K is affected by the light emitting characteristics of the light emitting member 11 and / or the optical characteristics of the light guide plate, for example, the brightness of the light emitting member 11 becomes smaller or the light guiding ability of the light guide plate becomes worse, the value of K becomes smaller, and vice versa. For example, the light source coefficient K can be 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.3, 1.4, or 1.5, etc.

[0048] Furthermore, by making the multi-color light emitted by the light emitting member 11 more uniformly mixed in the light guide plate 2, the CIE chromaticity (x, y) of the light rays emitted from the light guide plate 2 can be made to satisfy: 0.18≤x≤0.35, 0.18≤y≤0.35.

[0049] For example, the CIE chromaticity (x, y) of the light rays emitted from the light guide plate 2 can be x: 0.18, 0.19, 0.2, 0.21, 0.22, 0.23, 0.24, 0.25, 0.26, 0.27, 0.28, 0.29, 0.3, 0.31, 0.32, 0.33, 0.34, or 0.35, etc., and y: 0.18, 0.19, 0.2, 0.21, 0.22, 0.23, 0.24, 0.25, 0.26, 0.27, 0.28, 0.29, 0.3, 0.31, 0.32, 0.33, 0.34, or 0.35, etc.

[0050] Thus, the color gamut of the light rays emitted from the light guide plate 2 can more easily meet the display requirements of ultra-high color gamut. Specifically, the display requirements of ultra-high color gamut can include but are not limited to NTSC (National Television Standards Committee) ≥ 100%, DCI-P3 coverage rate > 95%, and BT.2020 coverage rate > 80%.

[0051] In order to make the color gamut of the light rays emitted from the light guide plate 2 meet higher display requirements, preferably, the light rays emitted from the light guide plate 2 have CIE chromaticity (x, y), 0.24≤x≤0.33, 0.20≤y≤0.33.

[0052] For example, the CIE chromaticity (x, y) of the light rays emitted from the light guide plate 2 can be x: 0.24, 0.245, 0.255, 0.265, 0.275, 0.285, 0.295, 0.35, 0.315, 0.325, or 0.33, etc., and y: 0.2, 0.25, 0.215, 0.225, 0.235, 0.245, 0.255, 0.265, 0.275, 0.285, 0.295, 0.35, 0.315, 0.325, or 0.33, etc.

[0053] In order to mix the multi-color light emitted by the light emitting component 11 into light of substantially white color, the light emitting component 11 can generally be configured to emit blue light, green light and red light.

[0054] As shown in Figure 2 For example, the light emitting component 11 includes a blue light chip 110, a green light chip 111 and a red light excitation layer 112, the red light excitation layer 112 covers at least the blue light chip 110, so that the blue light chip 110 can emit blue light, the green light chip 111 can emit green light, and the red light excitation layer 112 can emit red light by being excited by the blue light with high energy emitted by the blue light chip 110, thereby realizing that the light emitting component 11 can emit the three-color light of blue light, green light and red light at the same time.

[0055] Optionally, the red light excitation layer 112 can include red excitation particles, which can be specifically but not limited to red fluorescent powder (such as KSF fluorescent powder) and red quantum dots.

[0056] Furthermore, the red light excitation layer 112 can further include a packaging structure for packaging and fixing the red excitation particles, which can be specifically but not limited to a packaging glue structure and a packaging film layer structure.

[0057] In addition, the light emitting component 11 can also be any existing light emitting component 11 capable of emitting blue light, green light and red light, which will not be described here.

[0058] Optionally, the light emitting component 11 further includes a bowl cup 113, and the blue light chip 110 and the green light chip 111 are arranged in the bowl cup 113, so that the light emitting angle of the light emitting component 11 can be adjusted by the bowl cup 113, the light emitting direction of the light emitting component 11 is more concentrated, which is beneficial to reduce the side light of the light emitting component 11 and effectively improve the utilization efficiency of the light emitted by the blue light chip 110 and the green light chip 111.

[0059] In an optional embodiment, the light emitting component 11 can include one bowl cup 113, and the blue light chip 110 and the green light chip 111 are arranged in the one bowl cup 113, and the red light excitation layer 112 is filled in the bowl cup 113 and covers the blue light chip 110 and the green light chip 111.

[0060] In another optional embodiment, the light emitting component 11 can include a plurality of bowl cups 113, and each bowl cup 113 is provided with a light emitting chip. For example, the light emitting component 11 can include two bowl cups 113, the blue light chip 110 and the green light chip 111 are arranged in different bowl cups 113, and the red light excitation layer 112 is filled in at least one bowl cup 113 and covers the blue light chip 110. The bowl cup 113 provided with the green light chip 111 is filled with the red light excitation layer 112 or a packaging glue structure 114 (as shown in Figure 3Alternatively, both the bowl cup 113 are provided with the blue light chip 110 and the green light chip 111, and the red light excitation layer 112 is filled in the bowl cup 113 and covers the blue light chip 110 and the green light chip 111.

[0061] In addition, the light emitting piece 11 can be, but is not limited to, a flip chip including the blue light chip 110 and the green light chip 111, a COB (chip on board) chip.

[0062] In order to make the red light, the green light and the blue light emitted by the light emitting piece 11 mixed to obtain white light with a wider color gamut, the peak wavelength of the light emitted by the blue light chip 110 and the green light chip 111 needs to be within a certain range, and the half wave width needs to be relatively narrow.

[0063] Based on this, optionally, the peak wavelength of the blue light emitted by the blue light chip 110 can be within the range of 440nm-470nm, for example, the peak wavelength of the blue light emitted by the blue light chip 110 can be 440nm, 442nm, 445nm, 447nm, 450nm, 452nm, 455nm, 457nm, 460nm, 462nm, 465nm, 467nm or 470nm, etc., and the half wave width is ≤25nm, for example, the half wave width of the blue light emitted by the blue light chip 110 can be 25nm, 22nm, 20nm, 18nm, 15nm, 12nm, 10nm, 8nm, 5nm, 2nm or 1nm, etc.

[0064] Preferably, the peak wavelength of the blue light can be within the range of 447nm-465nm, for example, the peak wavelength of the blue light emitted by the blue light chip 110 can be 447nm, 448nm, 451nm, 453nm, 456nm, 458nm, 460nm, 463nm, 464nm or 465nm, etc.

[0065] Optionally, the peak wavelength of the green light emitted by the green light chip 111 can be within the range of 500nm-560nm, for example, the peak wavelength of the green light emitted by the green light chip 111 can be 500nm, 505nm, 510nm, 515nm, 520nm, 525nm, 530nm, 535nm, 540nm, 545nm, 550nm, 555nm or 600nm, etc., and the half wave width is ≤35nm, for example, the half wave width of the green light emitted by the green light chip 111 can be 25nm, 22nm, 20nm, 18nm, 15nm, 12nm, 10nm, 8nm, 5nm, 2nm or 1nm, etc.

[0066] Preferably, the peak wavelength of the green light can be in the range of 520nm~530nm, for example, the peak wavelength of the blue light emitted by the blue light chip 110 can be 520nm, 521nm, 522nm, 523nm, 524nm, 525nm, 526nm, 527nm, 528nm, 529nm or 530nm, etc.

[0067] The ratio of the peak intensity of the blue light to the peak intensity of the green light also affects the color point and color gamut of the light emitted by the self-lit light panel 2 after mixing. For example, the greater the proportion of the peak intensity of the blue light, the more the color point of the light emitted by the self-lit light panel 2 may shift towards the direction of increasing x value and decreasing y value, and the greater the proportion of the peak intensity of the green light, the more the color point of the light emitted by the self-lit light panel 2 may shift towards the direction of decreasing x value and increasing y value.

[0068] In order to make the color point of the white light obtained by mixing the red light, the green light and the blue light emitted by the light emitting piece 11 within the target color point range and the color gamut up to standard, and considering the requirement of using part of the energy of the blue light to excite the red light excitation layer 112 to emit red light, the peak intensity of the blue light emitted by the light emitting piece 11 can be approximately equal to or greater than the peak intensity of the green light, but the peak intensity of the blue light cannot be too large. Based on this, optionally, the ratio of the peak intensity of the blue light to the peak intensity of the green light can be in the range of 1:1~5:1, for example, the ratio of the peak intensity of the blue light to the peak intensity of the green light can be 1:1, 2:1, 3:1, 4:1 or 5:1, but is not limited to the listed values, and the remaining values in the value range are also applicable. Further, the ratio of the peak intensity of the blue light to the peak intensity of the green light is preferably 1:1~3:1, for example, the ratio of the peak intensity of the blue light to the peak intensity of the green light can be 1:1, 1.2:1, 1.5:1, 1.7:1, 2:1, 2.2:1, 2.5:1, 2.7:1 or 3:1.

[0069] The light emitting piece 11 can be of various structures. Next, the specific structures of several light emitting pieces 11 when the light emitting pieces 11 are arranged at intervals along the first direction S1 will be described in detail with reference to the drawings.

[0070] As shown in FIG. 6, the light emitting piece 11 can include a blue light chip 110, a green light chip 120 and a red light excitation layer 112. Figure 4As shown in the figure, in an optional embodiment, the light emitting piece 11 comprises a blue light chip 110 and a green light chip 111, the blue light chip 110 and the green light chip 111 are arranged opposite along the second direction S2, the relative positions of the blue light chip 110 and the green light chip 111 of two adjacent light emitting pieces 11 along the second direction S2 are opposite, wherein the first direction S1 and the second direction S2 are both parallel to the arrangement surface 100, and the first direction S1 and the second direction S2 are perpendicular to each other, so that along the first direction S1 and along the second direction S2, all the blue light chips 110 and the green light chips 111 included in the light source assembly 1 are alternately arranged, so that the distribution of the blue light, the green light and the red light emitted by the light emitting piece 11 is more dispersed and uniform, which is beneficial to further improve the mixing uniformity of the blue light, the green light and the red light emitted by the light emitting piece 11 after being conducted to the light guide plate 2.

[0071] As shown in the figure, Figure 5 As shown in the figure, in another optional embodiment, the light emitting piece 11 comprises two blue light chips 110 and two green light chips 111, the two blue light chips 110 and the two green light chips 111 are arranged in an array along the first direction S1 and the second direction S2, and the two blue light chips 110 are respectively located at two opposite corners of one diagonal direction, and the two green light chips 111 are respectively located at two opposite corners of another diagonal direction, and the arrangement positions of the blue light chips 110 and the green light chips 111 of all the light emitting pieces 11 are the same, so that along the first direction S1 and along the second direction S2, all the blue light chips 110 and the green light chips 111 included in the light source assembly 1 are alternately arranged, so that the distribution of the blue light, the green light and the red light emitted by the light emitting piece 11 is more dispersed and uniform, which is beneficial to further improve the mixing uniformity of the blue light, the green light and the red light emitted by the light emitting piece 11 after being conducted to the light guide plate 2.

[0072] As shown in the figure, Figure 6 As shown in the figure, in another optional embodiment, the light emitting piece 11 comprises two blue light chips 110 and a green light chip 111, the two blue light chips 110 are respectively located on two opposite sides of the green light chip 111 along the first direction S1, and the size of the blue light chip 110 is smaller than the size of the green light chip 111, so that on the one hand, the small size blue light chip 110 and the large size green light chip 111 can be made to roughly coincide in the illumination area along the first direction S1, and the coincidence degree of the illumination area along the second direction S2 is high, which is beneficial to further improve the mixing uniformity of the blue light, the green light and the red light emitted by the light emitting piece 11 after being conducted to the light guide plate 2, and on the other hand, it is convenient to adjust the size of the blue light chip 110 and the green light chip 111 to adjust the peak intensity ratio of the green light emitted by the green light chip 111 and the blue light emitted by the two blue light chips 110.

[0073] Wherein, in order to facilitate observation, Figures 4 to 6The blue light chip 110 is filled with grid lines to distinguish from the green light chip 111. It can be understood that the grid lines do not represent the actual structure shape.

[0074] In an optional example, the blue light chip 110 and the green light chip 111 of the light emitting component 11 can be electrically connected to different driving circuits respectively, so that the blue light chip 110 and the green light chip 111 can be controlled by different driving circuits respectively to adjust the peak intensity ratio of the blue light emitted by the blue light chip 110 and the green light emitted by the green light chip 111.

[0075] At this time, the pads of the blue light chip 110 and the green light chip 111 are independent to avoid the electrical connection between the blue light chip 110 and the green light chip 111.

[0076] Optionally, at least part of the blue light chips 110 of the light emitting component 11 can be connected in series, and at least part of the green light chips 111 of the light emitting component 11 can be connected in series to simplify the driving circuit of the light emitting component 11, as shown in Figure 7 Figure 7 A partial diagram of the driving circuit of the light emitting component 11 is shown in which a plurality of light emitting components 11 are divided into groups, the blue light chips 110 of each group of light emitting components 11 are connected in series, and the green light chips 111 are also connected in series.

[0077] In another optional example, the blue light chip 110 and the green light chip 111 of the light emitting component 11 can be connected in series to enable the blue light chip 110 and the green light chip 111 of the light emitting component 11 to be driven by the same current, and the driving circuit of the light emitting component 11 is designed to be simpler, lower in cost, higher in stability, and lower in power supply cost.

[0078] Further, at least part of the light emitting components 11 can be connected in series to further simplify the driving circuit of the plurality of light emitting components 11.

[0079] Preferably, the single light emitting component 11 can be driven first to adjust the green light band emitted by the green light chip 111, the blue light band emitted by the blue light chip 110, and the peak intensity ratio of the green light emitted by the green light chip 111 and the blue light emitted by the blue light chip 110 under the same current driving, and then the light emitting component 11 structure obtained after adjustment is mass-produced, and then the plurality of light emitting components 11 are connected in series.

[0080] In other embodiments, the blue light chip 110 and the green light chip 111 of the light emitting component 11 can also be connected in parallel.

[0081] ​The embodiment also provides a display device comprising the backlight module as described in the foregoing technical solutions, so that the display device can achieve better display effect by using the backlight module capable of achieving better light mixing effect and less color deviation.

[0082] Optionally, the display device can further comprise, but is not limited to, a liquid crystal panel for adjusting display brightness of the display device, a color filter for adjusting display color of the display device, and a reflective sheet for increasing light output efficiency of the backlight module towards the display side of the display device.

[0083] Obviously, the above-mentioned embodiments of the present application are only examples for the purpose of clear illustration, and are not intended to limit the embodiments of the present application. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of the present application. Here, it is unnecessary and impossible to enumerate all the embodiments. Any modification, equivalent substitution and improvement made within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A backlight module, characterized in that, include: A light source assembly (1) includes a substrate (10) and a plurality of light-emitting elements (11). One side surface of the substrate (10) is a mounting surface (100). The plurality of light-emitting elements (11) are arranged at intervals on the mounting surface (100). The light-emitting elements (11) can emit light of multiple colors simultaneously. A light guide plate (2) is disposed on the side of the light-emitting element (11) away from the setting surface (100); 2mm<D≤2×K×H×tan(θ / 2), where D is the center distance between two adjacent light-emitting elements (11) along the arrangement direction of the plurality of light-emitting elements (11), K is the light source coefficient and 0.5≤K≤1.5, H is the distance between the light guide plate (2) and the setting surface (100), and θ is the half-peak emission angle of the light-emitting element (11); The light emitted from the light guide plate (2) has CIE chromaticity (x, y), 0.18≤x≤0.35, 0.18≤y≤0.

35.

2. The backlight module according to claim 1, characterized in that, The light emitted from the light guide plate (2) has CIE chromaticity (x, y), 0.24≤x≤0.33, 0.20≤y≤0.

33.

3. The backlight module according to claim 1, characterized in that, The light-emitting element (11) includes a blue light chip (110), a green light chip (111), and a red light excitation layer (112), wherein the red light excitation layer (112) at least covers the blue light chip (110).

4. The backlight module according to claim 3, characterized in that, The light-emitting element (11) also includes a bowl (113), the blue light chip (110) and the green light chip (111) are both disposed in the bowl (113), and the red light excitation layer (112) is filled in the bowl (113).

5. The backlight module according to claim 3, characterized in that, The peak wavelength of the blue light emitted by the blue light chip (110) is in the range of 440nm~470nm, and the half-width is ≤25nm; The green light emitted by the green light chip (111) has a peak wavelength in the range of 500nm~560nm and a half-width ≤35nm.

6. The backlight module according to claim 3, characterized in that, The ratio of the peak intensity of the blue light to the peak intensity of the green light is in the range of 1:1 to 5:

1.

7. The backlight module according to claim 3, characterized in that, The peak wavelength of the blue light is in the range of 447nm to 465nm; And / or, the peak wavelength of the green light is in the range of 520nm to 530nm; And / or, the ratio of the peak intensity of the blue light to the peak intensity of the green light is in the range of 1:1 to 3:

1.

8. The backlight module according to any one of claims 3-7, characterized in that, Multiple light-emitting elements (11) are arranged at intervals along a first direction. Each light-emitting element (11) includes a blue light chip (110) and a green light chip (111). The blue light chip (110) and the green light chip (111) are arranged facing each other at intervals along a second direction. The relative positions of the blue light chip (110) and the green light chip (111) of two adjacent light-emitting elements (11) are opposite along the second direction. Wherein, both the first direction and the second direction are parallel to the setting surface (100), and the first direction is perpendicular to the second direction.

9. The backlight module according to any one of claims 3-7, characterized in that, Multiple light-emitting elements (11) are arranged at intervals along a first direction. Each light-emitting element (11) includes two blue light chips (110) and two green light chips (111). The two blue light chips (110) and the two green light chips (111) are arranged in an array along the first direction and the second direction. The two blue light chips (110) are located at two opposite corners in one diagonal direction, and the two green light chips (111) are located at two opposite corners in the other diagonal direction. The arrangement positions of the blue light chips (110) and the green light chips (111) of all the light-emitting elements (11) are the same. Wherein, both the first direction and the second direction are parallel to the setting surface (100), and the first direction is perpendicular to the second direction.

10. The backlight module according to any one of claims 3-7, characterized in that, The plurality of light-emitting elements (11) are arranged at intervals along a first direction. Each light-emitting element (11) includes two blue light chips (110) and one green light chip (111). The two blue light chips (110) are located on two opposite sides of the green light chip (111) along the first direction, and the size of the blue light chip (110) is smaller than the size of the green light chip (111).

11. The backlight module according to any one of claims 3-7, characterized in that, The light-emitting element (11) includes a blue light chip (110) connected in series with a green light chip (111), or can be electrically connected to different driving circuits respectively.

12. A display device, characterized in that, Includes the backlight module as described in any one of claims 1-11.

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