Backlight module and display device

Abstract

The embodiment of the utility model provides a backlight module and a display device. The backlight module comprises a back plate, at least one first light source, at least one second light source and a light guide plate, the first light source and the second light source respectively comprise light-emitting chips used for emitting light of different colors, and the first light source and the second light source are located on the two opposite sides of a light guide plate and both face the light guide plate. As the first light source and the second light source respectively comprise the light-emitting chips for emitting the light rays with different colors, one of the first light source and the second light source can emit the light rays tending to natural light, and the other one can emit the light rays deviating from the natural light. By controlling the light rays tending to natural light to be emitted, the output of harmful blue light can be effectively reduced, so that the eye fatigue of a user can be relieved. By controlling the emergence of the light deviating from the natural light, the output of the light in a specific wave band can be enhanced, so that a wider color gamut can be realized.

Description

Technical Field

[0001] This application relates to the field of display technology, specifically to a backlight module and display device. Background Technology

[0002] As a core component of LCD display devices, the performance of the backlight module directly affects the quality of the displayed image and the user's visual experience.

[0003] In related technologies, backlight modules typically use a single light source, which, while meeting basic display requirements, has limitations in light quality. Currently, backlight modules usually use light sources with a relatively concentrated emission wavelength; however, these are difficult to match the spectral characteristics of natural light, failing to provide users with a comfortable visual experience and often causing eye fatigue and dryness. Utility Model Content

[0004] This application provides a backlight module and display device to at least alleviate the problem of eye fatigue caused by the use of a single light source in backlight modules in related technologies.

[0005] On one hand, embodiments of this application provide a backlight module, including:

[0006] Back panel;

[0007] At least one first light source and at least one second light source are disposed on the back plate, wherein the first light source and the second light source respectively include light-emitting chips for emitting light of different colors; and

[0008] A light guide plate is disposed on the back plate;

[0009] The first light source and the second light source are located on opposite sides of the light guide plate and are both oriented toward the light guide plate.

[0010] In some embodiments, the first light source includes a blue light chip, and the second light source includes a violet light chip.

[0011] In some embodiments, the first light source further includes a first fluorescent layer located on the light-emitting side of the blue light chip, and the second light source further includes a second fluorescent layer located on the light-emitting side of the violet light chip. The second fluorescent layer contains more types of phosphors than the first fluorescent layer. Each phosphor is used to emit a second light of a specific wavelength when excited by the first light emitted by the corresponding light-emitting chip, and the second light emitted by different phosphors has different wavelengths.

[0012] In some embodiments, the natural light index of the first light source and the second light source are different, and the natural light index is the ratio of the overlap area of ​​the first spectral pattern of the corresponding light source and the second spectral pattern of the natural light source to the area of ​​the second spectral pattern of the natural light source; wherein, the natural light index of the first light source is greater than or equal to 0.15 and less than or equal to 0.2; and / or, the natural light index of the second light source is greater than or equal to 0.45 and less than or equal to 0.5.

[0013] In some embodiments, the backlight module further includes: a first substrate, a second substrate, a plurality of third light sources, and a plurality of fourth light sources. The plurality of first light sources are located on the first substrate; the plurality of second light sources are located on the second substrate; the plurality of third light sources are located on the first substrate, the light emitted by the third light sources is the same as the light emitted by the second light sources, and the plurality of third light sources and the plurality of first light sources are arranged alternately along the length direction of the first substrate; the plurality of fourth light sources are located on the second substrate, the light emitted by the fourth light sources is the same as the light emitted by the first light sources, and the plurality of fourth light sources and the plurality of second light sources are arranged alternately along the length direction of the second substrate.

[0014] In some embodiments, the first light source and the second light source are aligned, and the third light source and the fourth light source are aligned.

[0015] In some embodiments, the first light source and the third light source extend in the same direction, and the extension direction of the first light source forms a first angle with the length direction of the first substrate, wherein the first angle is greater than 0 and less than 90°.

[0016] In some embodiments, the second light source and the fourth light source extend in the same direction, and the extension direction of the second light source has a second angle with the length direction of the second substrate, the second angle being greater than 0 and less than 90°.

[0017] In some embodiments, the light-incident surface of the light guide plate includes a first sub-light-incident surface and a second sub-light-incident surface located on opposite sides of the light guide plate. The first light source is disposed facing the first sub-light-incident surface, and the second light source is disposed facing the second sub-light-incident surface. The light-emitting surface of the light guide plate is located on the side of the light guide plate away from the back plate, and the side of the light guide plate closer to the back plate is provided with a plurality of dots.

[0018] In some embodiments, the first distance between the first light source and the central cross-section of the light guide plate and the second distance between the second light source and the central cross-section of the light guide plate are equal; the plurality of dots located on the side of the central cross-section closer to the first light source are symmetrical with respect to the central cross-section as are the plurality of dots located on the side of the central cross-section closer to the second light source.

[0019] In some embodiments, the light guide plate has a first region and a second region located on the side of the central cross-section closer to the first light source, the second region being located on the side of the first region away from the first light source; the distribution density of the dots in the second region is greater than the distribution density of the dots in the first region.

[0020] On the other hand, embodiments of this application also provide a display device, which includes a backlight module as described in any of the above embodiments.

[0021] In the backlight module provided in this application embodiment, since the first and second light sources each include light-emitting chips for emitting different colors of light, for example, one of the first and second light sources can emit light that is close to natural light, while the other emits light that deviates from natural light. When the light source emitting light that is close to natural light is turned on, the output of harmful blue light by the backlight module can be effectively reduced, thereby helping to alleviate eye fatigue for users. When the light source emitting light that deviates from natural light is turned on, a wider color gamut can be achieved by enhancing the output of light in specific wavelengths. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of a backlight module provided in some embodiments of this application;

[0024] Figure 2 These are spectral diagrams of a light source and a natural light source according to some embodiments of this application;

[0025] Figure 3 This is a schematic diagram of the structure of a first light source according to some embodiments of this application;

[0026] Figure 4 This is a schematic diagram of the structure of a second light source according to some embodiments of this application;

[0027] Figure 5This is a distribution diagram of the first light source and the third light source on the first substrate according to some embodiments of this application;

[0028] Figure 6 This is a distribution diagram of the second and fourth light sources on the second substrate according to some embodiments of this application;

[0029] Figure 7 This is a partial structural diagram of a backlight module provided in some embodiments of this application;

[0030] Figure 8 These are light emission effect diagrams of backlight modules provided in some embodiments of this application;

[0031] Figure 9 This is a schematic diagram of the structure of a display device provided in some embodiments of this application.

[0032] Explanation of reference numerals in the attached figures:

[0033] 10. Backplate; 201. First substrate; 202. Second substrate; 21. First light source; 210. First base; 211. Blue light chip; 212. First phosphor layer; 2120. Phosphor; 22. Second light source; 220. Second base; 221. Ultraviolet light chip; 222. Second phosphor layer; 23. Third light source; 24. Fourth light source; 30. Light guide plate; 301. Dot; 31. Light incident surface; 311. First sub-light incident surface; 312. Second sub-light incident surface; 32. Light emitting surface; 40. Liquid crystal display panel; 50. Optical film; 100. Backlight module; 200. Display device; A1. First area; A2. Second area; D1. First pitch; D2. Second pitch; P. Center section; K1. First groove; K2. Second groove; M1. First spectral pattern; M2. Second spectral pattern. Detailed Implementation

[0034] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings.

[0035] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or specifying the number of technical features indicated. Therefore, features defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified. A and / or B indicate that A may exist alone, B may exist alone, or A and B may exist simultaneously.

[0036] Some embodiments of this application provide a backlight module, such as Figure 1As shown, the backlight module 100 includes: a back plate 10 and at least one first light source 21, at least one second light source 22 and a light guide plate 30 disposed on the back plate 10.

[0037] The light guide plate 30 has an incident light surface 31 and an exit light surface 32. The light guide plate 30 receives light rays incident on the incident light surface 31 and exits light rays from the exit light surface 32. The first light source 21 and the second light source 22 are located on opposite sides of the light guide plate 30 and both face the incident light surface 31 of the light guide plate 30. The light guide plate 30 can guide light rays from the first light source 21 and / or the second light source 22 through the exit light surface 32, thereby achieving a good light guiding effect.

[0038] As an example, the light-incident surface 31 of the light guide plate 30 includes a first sub-light-incident surface 311 and a second sub-light-incident surface 312 located on opposite sides of the light guide plate 30. The first light source 21 is disposed facing the first sub-light-incident surface 311, and the second light source 22 is disposed facing the second sub-light-incident surface 312. This arrangement facilitates the fixation of the first light source 21 and the second light source 22, and the first light source 21 and the second light source 22 can form a symmetrical distribution, thereby improving the stability of the overall structure. On the other hand, the first light source 21 and the second light source 22 are distributed on both sides of the light guide plate 30, which also facilitates the heat dissipation of the first light source 21 and the second light source 22.

[0039] In this embodiment, the first light source 21 and the second light source 22 each include light-emitting chips for emitting light of different colors. The light-emitting chips emitting different colors of light have different natural light indices. The natural light index indicates the degree to which the light emitted by a light source approximates natural light; a higher natural light index indicates that the light emitted by the light source is closer to natural light, while a lower natural light index indicates that the light emitted by the light source deviates more from natural light.

[0040] Specifically, such as Figure 2 As shown, the natural light index is the ratio of the overlap area between the first spectral pattern M1 of a light source and the second spectral pattern M2 of a natural light source to the area of ​​the second spectral pattern M2 of the natural light source. Natural light can be represented by a D65 light source, which is an artificial light source that simulates natural light as defined by the International Organization for Standardization (ISO) and has continuous spectral characteristics. Therefore, the larger the overlap area between the spectral pattern M1 of the corresponding light source and the spectral pattern M2 of the natural light, the higher the natural light index of the light source, and thus the closer the light emitted by the light source is to natural light.

[0041] Because the first light source 21 and the second light source 22 have different natural light indices, one of the first light source 21 and the second light source 22 emits light that is close to natural light, while the other emits light that deviates from natural light.

[0042] For ease of explanation, the following example of this application illustrates the situation by assuming that the natural light index of the first light source 21 is less than that of the second light source 22.

[0043] Because the natural light index of the first light source 21 is lower than that of the second light source 22, the first light source 21 emits light that deviates from natural light, while the second light source 22 emits light that approaches natural light. When only the second light source 22 is on, the backlight module 100 is in eye-protection mode, and its output light approaches natural light, effectively reducing the output of harmful blue light and thus alleviating eye fatigue. When only the first light source 21 is on, the backlight module 100 is in normal mode, and its output light deviates from natural light, thus achieving a wider color gamut by enhancing the output of specific wavelengths. Of course, when both the first light source 21 and the second light source 22 are on, the backlight module 100 is in high-brightness mode, which has relatively high light output brightness. Therefore, with the backlight module 100 provided in this embodiment, users can control the activation of the first light source 21 and the second light source 22 according to different scenario needs, thereby improving the user experience.

[0044] In some examples, the natural light index of the first light source 21 is greater than or equal to 0.15 and less than or equal to 0.2. With this setting, the output light of the first light source 21 deviates significantly from natural light, thereby effectively enhancing the light output in specific wavelength bands and achieving a good gain effect in wide color gamut display.

[0045] In some examples, the natural light index of the second light source 22 is greater than or equal to 0.45 and less than or equal to 0.5. With this setting, the light output by the second light source 22 closely approximates natural light, which can effectively improve the visual comfort and color reproduction of the backlight module 100, and effectively protect the user's eyes.

[0046] To further illustrate the differences between the first light source 21 and the second light source 22, the following table 1 shows the differences between the two.

[0047]

[0048] Table 1

[0049] In this diagram, Lum. represents brightness, and the brightness of the light emitted by the second light source 22 is significantly lower than that of the light emitted by the first light source 21. Wx and Wy represent the coordinates of different light source colors in the CIE 1931 chromaticity diagram, respectively. The second light source 22 is shifted towards a higher Y value compared to the first light source 21, making the colors presented by the second light source 22 warmer. sRGB (CIE1931), DCI-P3 (CIE1976), and Adobe RGB (CIE1931) represent the color spaces under the three corresponding standards. In all three color spaces, the color gamut covered by the second light source 22 is relatively small, therefore, the color gamut performance of the second light source 22 is weaker than that of the first light source 21. Furthermore, the Nature-Like Index represents the natural light index, and the natural light index of the second light source 22 is higher than that of the first light source 21. Therefore, the first light source 21 has the characteristics of a wide color gamut and high brightness, while the light emitted by the second light source 22 is closer to natural light, which has the characteristics of visual comfort.

[0050] In some embodiments, such as Figure 3 As shown, the first light source 21 includes a blue light chip 211. The main peak of the light emitted by the blue light chip 211 is usually located around 450nm. Therefore, the blue light chip 211 has the advantage of a high color gamut and can effectively cooperate with the phosphor to make the first light source 21 emit white light with a wide spectrum.

[0051] As an example, the blue light chip 211 can use indium gallium nitride as the light-emitting layer to achieve blue light emission.

[0052] In some examples, the first light source 21 also includes a first phosphor layer 212 located on the light-emitting side of the blue light chip 211. The first phosphor layer 212 is provided with at least one phosphor 2120, which is used to emit a second light of a specific wavelength when excited by the first light emitted by the first light source 21.

[0053] As an example, phosphor 2120 can be selected from phosphors with relatively concentrated wavelengths and narrow half-wavelengths, such as aluminates, nitrides, oxynitrides or fluorides, so that the main peak of the spectrum of the first light source 21 is sharper, thereby effectively improving the color gamut performance of the backlight module 100.

[0054] For example, the first fluorescent layer 212 is provided with two phosphors 2120. One phosphor 2120 can emit light with a wavelength of 540nm when excited by the first light emitted by the first light source 21; the other phosphor 2120 can emit light with a wavelength of 630nm when excited by the first light emitted by the first light source 21.

[0055] In some examples, the first light source 21 also includes a first substrate 210 having a first groove K1, in which the blue light chip 211 and the first phosphor layer 212 are located.

[0056] By setting the first groove K1 and placing the blue light chip 211 within the first groove K1, the packaging of the blue light chip 211 is facilitated, thereby ensuring the stability of the blue light chip 211 in use. In addition, since the first phosphor layer 212 is located within the first groove K1, it is beneficial to arrange the first phosphor layer 212 around the blue light chip 211, thereby improving the manufacturing efficiency of the first light source 21.

[0057] As an example, the sidewall of the first groove K1 is provided with a reflective layer, which can reduce the lateral light leakage of the blue light chip 211, thereby improving the light output efficiency of the first light source 21.

[0058] In some embodiments, such as Figure 4 As shown, the second light source 22 includes a violet light chip 221. The proportion of blue light in the light emitted by the violet light chip 221 is reduced, thereby effectively reducing the output of harmful blue light; and the violet light chip 221 has a more uniform spectral energy distribution, which can be adapted to a relatively larger range of phosphors so that the second light source 22 emits light that is relatively close to natural light.

[0059] As an example, the violet light chip 221 can use gallium aluminum nitride material as the light-emitting layer to achieve violet light emission.

[0060] In some examples, the second light source 22 further includes a second phosphor layer 222 located on the light-emitting side of the ultraviolet chip 221. The second phosphor layer 222 contains various phosphors 2120, which emit light of a specific wavelength when excited by the light emitted from the second light source 22. The second phosphor layer 222 contains more types of phosphors 2120 than the first phosphor layer 212. As an example, such as... Figure 3 and Figure 4 As shown, Figure 3 The first fluorescent layer 212 contains two types of phosphors 2120. Figure 4 The second fluorescent layer 222 contains four types of phosphors 2120. The different types of phosphors 2120 emit light with different wavelengths. For example, when excited by light emitted from the second light source 22, one phosphor 2120 emits light with a wavelength of 448 nm; another phosphor 2120 emits light with a wavelength of 497 nm; yet another phosphor 2120 emits light with a wavelength of 528 nm; and still another phosphor 2120 emits light with a wavelength of 648 nm.

[0061] Because the second fluorescent layer 222 contains a relatively greater variety of phosphors 2120, it has a better effect on regulating the spectrum of the second light source 22, thereby making the light emitted by the second light source 22 more like natural light, thus improving the user experience when the second light source 22 is turned on.

[0062] In some examples, the second light source 22 also includes a second substrate 220 having a second groove K2, within which the violet chip 221 and the second fluorescent layer 222 are located.

[0063] By setting the second groove K2 and placing the violet light chip 221 within the second groove K2, the packaging of the violet light chip 221 is facilitated, thereby ensuring the stability of the violet light chip 221 in use. In addition, since the second phosphor layer 222 is located within the second groove K2, it is beneficial to arrange the second phosphor layer 222 around the violet light chip 221, thereby improving the manufacturing efficiency of the second light source 22.

[0064] As an example, the sidewall of the second groove K2 is provided with a reflective layer, which can reduce the lateral light leakage of the violet light chip 221, thereby improving the light output efficiency of the second light source 22.

[0065] In some embodiments, such as Figure 5 and Figure 6 As shown, the backlight module 100 further includes: a first substrate 201, a second substrate 202, a plurality of third light sources 23, and a plurality of fourth light sources 24. The light emitted by the third light sources 23 is the same as the light emitted by the second light sources 22; the light emitted by the fourth light sources 24 is the same as the light emitted by the first light sources 21. For example, the natural light index of the third light sources 23 is the same as that of the second light sources 22; and the natural light index of the fourth light sources 24 is the same as that of the first light sources 21.

[0066] Understandably, the third light source 23 can have the exact same structure as the second light source 22, so that the light emitted by the third light source 23 is the same as the light emitted by the second light source 22. Similarly, the fourth light source 24 can have the exact same structure as the first light source 21, so that the light emitted by the fourth light source 24 is the same as the light emitted by the first light source 21.

[0067] Multiple first light sources 21 and multiple third light sources 23 are located on the first substrate 201 and are arranged alternately along the length of the first substrate 201. For example, multiple first light sources 21 and multiple third light sources 23 are arranged in a sequence, wherein the light source corresponding to the odd number is the first light source 21 and the light source corresponding to the even number is the third light source 23.

[0068] Multiple fourth light sources 24 and multiple second light sources 22 are located on the second substrate 202 and are arranged alternately along the length of the second substrate 202. For example, multiple second light sources 22 and multiple fourth light sources 24 are arranged in a sequence, wherein the light sources corresponding to the odd-numbered sequences are the second light sources 22, and the light sources corresponding to the even-numbered sequences are the fourth light sources 24.

[0069] In this scenario, when entering eye protection mode, all the first light sources 21 and the fourth light source 24 are activated. The first light sources 21 and the fourth light source 24 can then direct light into the light guide plate 30 from both sides, achieving good light output. When entering normal mode, all the second light sources 22 and the third light source 23 are activated. The second light sources 22 and the third light source 23 can then direct light into the light guide plate 30 from both sides, achieving good light output. When entering high-brightness mode, all the first light sources 21, the second light sources 22, the third light sources 23, and the fourth light source 24 are activated, enabling the backlight module 100 to achieve high-brightness light output.

[0070] It is worth noting that since the first light source 21 and the fourth light source 24 incident light onto the light guide plate 30 from the left and right sides respectively, this not only increases the number of light sources, thereby improving the brightness of the backlight module 100, but also effectively improves the light emission uniformity of the light guide plate 30, thus improving the light emission uniformity of the backlight module 100. Similarly, since the second light source 22 and the third light source 23 incident light onto the light guide plate 30 from the left and right sides respectively, both the brightness and light emission uniformity of the backlight module 100 are improved.

[0071] In some examples, a plurality of first light sources 21 and a plurality of third light sources 23 are electrically connected to a first driving circuit of a first substrate 201, so as to control at least one of the first light sources 21 and the third light sources 23 to be turned on or off via the first driving circuit. Similarly, a plurality of second light sources 22 and a plurality of fourth light sources 24 are electrically connected to a second driving circuit of a second substrate 202, so as to control at least one of the second light sources 22 and the fourth light sources 24 to be turned on or off via the second driving circuit.

[0072] In some embodiments, please continue reading Figure 5 and Figure 6 The first light source 21 and the second light source 22 are aligned, and the third light source 23 and the fourth light source 24 are aligned.

[0073] As an example, the orthographic projection of the first light source 21 on the second substrate 202 overlaps with that of the second light source 22, and the orthographic projection of the third light source 23 on the second substrate 202 overlaps with that of the fourth light source 24. In a specific arrangement, the first substrate 201 and the second substrate 202 are arranged facing each other, with the first light source 21 and the second light source 22 both located in odd-numbered sequences; while the third light source 23 and the fourth light source 24 are both located in even-numbered sequences.

[0074] By aligning the first light source 21 with the second light source 22, and the third light source 23 with the fourth light source 24, a misalignment is achieved between the first light source 21 and the fourth light source 24, and between the second light source 22 and the third light source 23. This ensures that the light emitted by the first light source 21 and the fourth light source 24, and the light emitted by the second light source 22 and the third light source 23, is staggered when they are turned on. This effectively improves the light emission uniformity of the light guide plate 30, thereby enhancing the light emission uniformity of the backlight module 100.

[0075] In some embodiments, such as Figure 5 As shown, the first light source 21 and the third light source 23 extend in the same direction, and the extension direction of the first light source 21 has a first angle α with the length direction of the first substrate 201, the first angle α being greater than 0 and less than 90°.

[0076] This arrangement causes the first light source 21 and the third light source 23 to be arranged at an angle relative to the first substrate 201, thereby allowing for a relatively larger number of light sources to be arranged on the first substrate 201, thus improving the light output brightness of the backlight module 100. Compared to the case in related technologies where the first included angle α equals 90°, the number of light sources on the same 27-inch length first substrate 201 can be increased from 128 to 160, thus effectively improving the light output brightness of the backlight module 100.

[0077] In some examples, the first included angle α is greater than or equal to 30° and less than or equal to 60°. For example, the first included angle α can be 30°, 35°, 40°, 45°, 50°, 55° or 60°.

[0078] In some embodiments, such as Figure 6 As shown, the second light source 22 and the fourth light source 24 extend in the same direction, and the extension direction of the second light source 22 has a second included angle β with the length direction of the second substrate 202, which is greater than 0 and less than 90°.

[0079] This arrangement allows the second light source 22 and the fourth light source 24 to be arranged at an angle relative to the second substrate 202, thereby enabling a relatively large number of light sources to be arranged on the second substrate 202, which in turn improves the light output brightness of the backlight module 100.

[0080] In some examples, the second included angle β is greater than or equal to 30° and less than or equal to 60°. For example, the second included angle β can be 30°, 35°, 40°, 45°, 50°, 55° or 60°.

[0081] In some embodiments, such as Figure 7 As shown, the light-emitting surface 32 of the light guide plate 30 is located on the side of the light guide plate 30 away from the back plate 10, and the side of the light guide plate 30 near the back plate 10 is provided with multiple dots 301. The dots 301 are used to break the total internal reflection of light, so that the light incident from the light-incident surface 31 is emitted towards the light-emitting surface 32 to form a uniform surface light source, thereby improving the light emission effect of the backlight module 100.

[0082] As an example, dot 301 can be made of a high-reflectivity material, such as white ink or a metallic coating. Dot 301 can also be set using structures such as protrusions or grooves, and this application embodiment does not limit this.

[0083] When the first light source 21 and the third light source 23 are alternately arranged on the first substrate 201, the first light source 21 and the third light source 23 have the same spacing distance relative to the first sub-light incident surface 311 of the light guide plate 30. Similarly, when the second light source 22 and the fourth light source 24 are alternately arranged on the first substrate 201, the second light source 22 and the fourth light source 24 have the same spacing distance relative to the second sub-light incident surface 312 of the light guide plate 30.

[0084] In some examples, the first distance D1 between the first light source 21 and the central cross-section P of the light guide plate 30, and the second distance D2 between the second light source 22 and the central cross-section P of the light guide plate 30, are equal. That is, the first light source 21 and the second light source 22 are symmetrical about the central cross-section P. Here, the central cross-section P of the light guide plate 30 refers to a surface on which the light guide plate 30 has a cross-section, and the first sub-light-incident surface 311 and the second sub-light-incident surface 312 are symmetrical about this cross-section. A plurality of dots 301 located on the side of the central cross-section P closer to the first light source 21 are symmetrical about the central cross-section P to a plurality of dots 301 located on the side of the central cross-section P closer to the second light source 22.

[0085] Since the first light source 21 and the second light source 22 are symmetrical about the central sectional plane P, and the dots 301 located on both sides of the central sectional plane P are symmetrical about the central sectional plane P, the final light output distribution of the backlight module 100 can be made relatively uniform.

[0086] like Figure 8 As shown, Figure 8The final light emission effect diagram of the backlight module 100 is shown. By symmetrically arranging the dots 301 on both sides of the central section P about the central section P, the light emission distribution of the backlight module 100 is relatively uniform, thereby effectively improving the display effect of the display device to which the backlight module 100 is applied.

[0087] In some examples, please refer to [link / reference]. Figure 7 The light guide plate 30 has a first region A1 and a second region A2 located on the side of the central cross-section P closer to the first light source 21. The second region A2 is located on the side of the first region A1 away from the first light source 21. The distribution density of dots 301 in the second region A2 is greater than that in the first region A1. Here, the distribution density of dots 301 refers to the number of dots 301 per unit area.

[0088] Since the second zone A2 is farther away from the light guide plate 30, by setting the distribution density of the dots 301 in the second zone A2 to be relatively large, the brightness difference of the light guide plate 30 at the near and far ends of the light source can be effectively balanced, thereby ensuring that the backlight module 100 presents a uniform brightness light output effect.

[0089] In some examples, for the region of the central cross-section P near the first light source 21, the spacing between adjacent dots 301 gradually decreases along the direction away from the first light source 21. This can effectively improve the light emission uniformity of the backlight module 100.

[0090] Some embodiments of this application also provide a display device, such as... Figure 9 As shown, the display device 200 includes the backlight module 100 described in any of the above embodiments.

[0091] When the second light source 22 in the backlight module 100 is turned on, it can effectively reduce eye fatigue or damage caused by prolonged viewing of the display device 200, providing users with a healthier eye environment, especially suitable for scenarios such as long-term reading or office work. When the first light source 21 in the backlight module 100 is turned on, it can achieve a wider color gamut, thereby improving the viewing experience of the displayed image.

[0092] For details regarding the structure and other beneficial effects of the backlight module 100 in the display device 200, please refer to the foregoing description of the embodiments of the backlight module 100, which will not be repeated here.

[0093] In some examples, the display device 200 also includes a liquid crystal display panel 40 located on the light-emitting side of the backlight module 100. The backlight module 100 provides good backlighting for the liquid crystal display panel 40, thereby ensuring the display effect of the display device 200.

[0094] As an example, at least one optical film 50 may be provided between the backlight module 100 and the liquid crystal display panel 40. The optical film may include, for example, a diffusion film, a prism film, a polarizer, etc., to further improve the display effect of the display device 200.

[0095] It is worth noting that specific terms are used to describe embodiments of this application. For example, "one embodiment," "some embodiments," "one example," or "some examples" refer to a particular feature, structure, or characteristic related to at least one embodiment or example of this application. Therefore, it should be emphasized and noted that "one embodiment," "some embodiments," "one example," or "some examples" mentioned twice or more in different locations in this specification do not necessarily refer to the same embodiment or example. Furthermore, certain features, structures, or characteristics of one or more embodiments or examples of this application can be appropriately combined.

[0096] Similarly, it should be noted that, in order to simplify the description of the embodiments of this application and thus aid in the understanding of one or more embodiments, the foregoing description of the embodiments of this application sometimes combines multiple features into a single embodiment, drawing, or description thereof. However, this disclosure method does not imply that the subject matter of this application requires more features than those mentioned in the claims. In fact, the embodiments contain fewer features than all the features of the single embodiments disclosed above.

Claims

1. A backlight module, characterized in that, include: Back panel; At least one first light source and at least one second light source are disposed on the back plate, wherein the first light source and the second light source respectively include light-emitting chips for emitting light of different colors; as well as A light guide plate is disposed on the back plate; The first light source and the second light source are located on opposite sides of the light guide plate and are both oriented toward the light guide plate.

2. The backlight module of claim 1, wherein, The first light source includes a blue light chip, and the second light source includes a violet light chip.

3. The backlight module according to claim 2, characterized in that, The first light source further includes a first fluorescent layer located on the light-emitting side of the blue light chip, and the second light source further includes a second fluorescent layer located on the light-emitting side of the violet light chip. The second fluorescent layer contains more types of phosphors than the first fluorescent layer. Each phosphor is used to emit a second light of a specific wavelength when excited by the first light emitted by the corresponding light-emitting chip, and the second light emitted by different phosphors has different wavelengths.

4. The backlight module according to claim 1, characterized in that, The first light source and the second light source have different natural light indices. The natural light index is the ratio of the overlap area between the first spectral pattern of the corresponding light source and the second spectral pattern of the natural light source to the area of ​​the second spectral pattern of the natural light source; wherein, The natural light index of the first light source is greater than or equal to 0.15 and less than or equal to 0.2; and / or The natural light index of the second light source is greater than or equal to 0.45 and less than or equal to 0.

5.

5. The backlight module according to any one of claims 1-4, characterized in that, The backlight module also includes: A first substrate, wherein a plurality of the first light sources are located on the first substrate; A second substrate, on which a plurality of second light sources are located; Multiple third light sources are located on the first substrate. The light emitted by each third light source is the same as the light emitted by the second light source, and the multiple third light sources and the multiple first light sources are arranged alternately along the length of the first substrate; and Multiple fourth light sources are located on the second substrate. The light emitted by the fourth light sources is the same as that emitted by the first light source, and the multiple fourth light sources and the multiple second light sources are arranged alternately along the length of the second substrate.

6. The backlight module according to claim 5, characterized in that, The first light source is aligned with the second light source, and the third light source is aligned with the fourth light source.

7. The backlight module according to claim 5, characterized in that, The first light source and the third light source extend in the same direction, and the extension direction of the first light source forms a first angle with the length direction of the first substrate, the first angle being greater than 0 and less than 90°; and / or The second light source and the fourth light source extend in the same direction, and the extension direction of the second light source has a second angle with the length direction of the second substrate, the second angle being greater than 0 and less than 90°.

8. The backlight module according to claim 5, characterized in that, The light-emitting surface of the light guide plate is located on the side of the light guide plate away from the back plate, and the side of the light guide plate close to the back plate is provided with multiple dots; The first distance between the first light source and the central cross-section of the light guide plate and the second distance between the second light source and the central cross-section of the light guide plate are equal; The plurality of dots located on the side of the central cross-section closer to the first light source are symmetrical with respect to the central cross-section as are the plurality of dots located on the side of the central cross-section closer to the second light source.

9. The backlight module according to claim 8, characterized in that, The light guide plate has a first area and a second area located on the side of the central cross-section close to the first light source, and the second area is located on the side of the first area away from the first light source; The distribution density of the network points in the second area is greater than that in the first area.

10. A display device, characterized in that, include: The backlight module as described in any one of claims 1-9.

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