Backlight module and display device

Abstract

The present invention discloses a backlight module and a display device. The backlight module includes a backplane, a light source arranged on the backplane, and a dimming structure arranged on the backplane. The dimming structure includes a light conversion layer and an electrochromic layer. The light conversion layer is arranged on the backplane and is arranged opposite to a part of the light emitting surface of the light source. The electrochromic layer is arranged on the optical path when the light emitted by the light source irradiates the light conversion layer, and is used to adjust the transmittance of the light emitted by the light source when it irradiates the light conversion layer. The technical solution of the present invention arranges the electrochromic layer on the optical path when the light emitted by the light source irradiates the light conversion layer. The electrochromic layer has different transmittances at different voltages and times, so as to adjust the amount of light irradiated on the light conversion layer, and then adjust the mixing ratio of different colors of light to achieve the effect of adjusting the color temperature. In addition, since the electrochromic layer has a bistable characteristic, the user only needs to apply voltage at the moment of adjusting the color temperature, thereby achieving the effect of reducing the power consumption of the backlight module.

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 using the backlight module. Background Art

[0002] Usually, display devices are equipped with a color temperature adjustment function. Consumers can change the color temperature of the panel display through the color temperature adjustment function in the display device, so that the color temperature of the panel can be increased or decreased, corresponding to cold tones (bluish) and warm tones (yellowish), so as to meet the consumer's usage habits. However, the traditional display panel adjusts the color temperature by adjusting the working voltage of the red, green and blue pixels through the Accurate color correction (ACC) function of the panel. For example, when warm tones are required, the liquid crystal working voltage of the blue pixel is reduced or increased to adjust the emission of blue light, thereby achieving the effect of adjusting the color temperature. However, this method will lose a certain amount of transmittance on the one hand, and on the other hand, if you want to achieve the same brightness before temperature adjustment, you need to increase the current of the backlight module, which will increase the power consumption of the backlight module. Or the traditional display panel adjusts the color temperature by adding an auxiliary light source, which will complicate the backlight circuit on the one hand and increase the power consumption of the backlight on the other hand. Summary of the invention

[0003] The main purpose of the present invention is to provide a backlight module, aiming to improve the problem that the traditional backlight module needs to increase power consumption in order to adjust the color temperature.

[0004] To achieve the above-mentioned purpose, the backlight module proposed in the present invention includes a backplane and a light source arranged on the backplane, the backlight module also includes a dimming structure, the dimming structure includes a light conversion layer and an electrochromic layer, the light conversion layer is arranged on the backplane and is arranged opposite to a part of the light emitting surface of the light source; the electrochromic layer is arranged on the light path when the light emitted by the light source is irradiated to the light conversion layer, and is used to adjust the transmittance of the light emitted by the light source when it is emitted to the light conversion layer.

[0005] In one embodiment, the back panel includes a bottom panel and a side panel connected to the bottom panel, the bottom panel and the side panel together enclose a receiving cavity, a mounting groove is formed on the side panel, and the opening of the mounting groove faces the receiving cavity; the light source is arranged on the bottom wall of the mounting groove, and the light conversion layer and the electrochromic layer are sequentially stacked on the side wall of the mounting groove.

[0006] In one embodiment, the installation groove is a trapezoidal groove, and the groove opening of the installation groove gradually increases from away from the accommodating cavity to close to the accommodating cavity.

[0007] In one embodiment, two side panels are arranged opposite to each other, both of the side panels are formed with the installation groove, the bottom wall of each installation groove is installed with the light source, and the side wall of each installation groove is sequentially stacked with the light conversion layer and the electrochromic layer.

[0008] In one embodiment, the backlight module further includes a light guide plate, and the light guide plate is disposed in the accommodating cavity and corresponds to a notch of the mounting groove.

[0009] In one embodiment, the backplane includes a base plate, a plurality of light sources are provided and arranged in a matrix on the base plate, the light conversion layer and the electrochromic layer are sequentially stacked on the base plate and arranged in the gap between two adjacent light sources.

[0010] In one embodiment, the backplane includes a base plate, a plurality of light sources are provided and arranged in a matrix on the base plate, a plurality of dimming structures are provided, one dimming structure is correspondingly arranged around one of the light sources, and the light conversion layer and the electrochromic layer in each of the dimming structures are sequentially stacked on the base plate.

[0011] In one embodiment, the backplane includes a base plate, a plurality of the light sources are provided and arranged in a matrix on the base plate, each of the light sources is surrounded by a plurality of the dimming structures arranged in a ring array, and the electrochromic layer in each of the dimming structures is wrapped around the light conversion layer.

[0012] In one embodiment, the light conversion layer and the electrochromic layer are both hemispherical.

[0013] The present invention further provides a display device, comprising a display panel and the above-mentioned backlight module, wherein the backlight module is arranged on the light incident side of the display panel.

[0014] The technical solution of the present invention is that a light conversion layer is arranged relative to part of the light emitting surface of the light source, and the electrochromic layer is arranged on the light path when the light emitted by the light source irradiates the light conversion layer. Then, the electrochromic layer can achieve different light transmission states under different voltages and different times of applying voltage, so as to adjust the amount of light irradiated on the light conversion layer, and then adjust the mixing ratio of the light converted into different colors by the light conversion layer and the light of the original color emitted by the light source, so as to achieve the effect of adjusting the color temperature. In addition, since the electrochromic layer has a bistable characteristic, that is, it can maintain the current state after the voltage is removed, the user only needs to apply voltage at the moment of adjusting the color temperature, and no additional voltage needs to be applied at other times, thereby achieving the effect of reducing the power consumption of the backlight module. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0016] Figure 1 This is a structural schematic diagram of an example of a backlight module according to an embodiment of the present invention, in which only one side panel is provided with a dimming structure;

[0017] Figure 2 This is a structural schematic diagram of an example of a backlight module in an embodiment of the present invention, in which both side panels are provided with dimming structures;

[0018] Figure 3 for Figure 2 Sectional view of AA in the middle;

[0019] Figure 4 It is a structural schematic diagram of another example of a backlight module according to the first embodiment of the present invention;

[0020] Figure 5 It is a structural schematic diagram of another example of a backlight module according to the first embodiment of the present invention;

[0021] Figure 6 This is a structural schematic diagram of another example of a backlight module according to the first embodiment of the present invention;

[0022] Figure 7 for Figure 6 Cross-sectional view of the middle BB;

[0023] Figure 8 It is a schematic structural diagram of an example of a display device according to the second embodiment of the present invention;

[0024] Fig. 9 It is a structural schematic diagram of another example of the display device according to the second embodiment of the present invention;

[0025] Fig.10 FIG. 1 is a structural diagram of another example of the display device according to the second embodiment of the present invention.

[0026] Description of Figure Numbers:

[0027] Label name Label name 100 Backlight module 110 Back Plate 111 Base Plate 112 Side panels 1121 Mounting slot 1121a bottom wall 1121b Sidewall 120 light source 130 Dimming structure 131 Light conversion layer 132 Electrochromic layer 140 Light guide plate 150 Optical film 200 Display Panel

[0028] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the 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.

[0030] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0031] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0032] Embodiment 1:

[0033] The present invention provides a backlight module 100 .

[0034] In the embodiments of the present invention, please refer to Figures 1 to 7 The backlight module 100 includes a back plate 110 and a light source 120 disposed on the back plate 110. The backlight module 100 also includes a dimming structure 130. The dimming structure 130 includes a light conversion layer 131 and an electrochromic layer 132. The light conversion layer 131 is disposed on the back plate 110 and is arranged opposite to a part of the light emitting surface of the light source 120. The electrochromic layer 132 is disposed on the optical path when the light emitted by the light source 120 irradiates the light conversion layer 131, and is used to adjust the transmittance of the light emitted by the light source 120 when it is emitted to the light conversion layer 131.

[0035] The light conversion layer 131 is used to convert the light emitted by the light source 120 and passing through the electrochromic layer 132, so that the part of the light is converted into light of a different color from the light emitted by the light source 120. The light conversion layer 131 can be a quantum dot layer or a phosphor layer. In the following, the light conversion layer 131 is taken as an example of a phosphor layer. If the light emitted by the light source 120 is blue light, the phosphor layer can be a fluorescent material that converts blue light into yellow light, such as yellow phosphors such as YAG:Ge, TAG:Ge, Sialon:Eu; or the phosphor can be a fluorescent material that converts blue light into red light, such as silicate phosphors, tungstate molybdates, aluminates, nitrides, KSF and other red phosphors; or the phosphor can be a fluorescent material that converts blue light into green light, such as BaAl2S2:Eu, SrAl2S2:Eu, BaMgAl 10 O 17 :Eu and other green phosphors. When the light conversion layer 131 is a phosphor layer, if the light emitted by the light source 120 is red light or green light, the phosphor layer is a fluorescent material that converts red light or green light into blue light, such as polyoxyethyl-tocopherol sebacic acid (PTS) block copolymer, thioaryl imide derivatives, anthracene derivative DPA and other organic materials, and can also be a mixture of any one or more of sulfide, fluoride, tellurate, bismuthate and phosphate.

[0036] The structure of the electrochromic layer 132 includes a first electrode, a second electrode, and a solution between the first electrode and the second electrode. The solution contains Ag ions or Au ions. According to the different voltages applied to the first electrode and the second electrode, the Ag ions or Au ions in the solution will gradually reduce to form an Ag metal layer or an Au metal layer at the electrode where the negative electrode is located, thereby making the electrochromic layer 132 have different states, so that it switches between transparent, mirror and light-absorbing black states according to the change of the applied voltage. For example, when the first electrode is a positive electrode, the second electrode is a negative electrode, and the first time length is maintained, the electrochromic layer 132 in the solution presents a mirror state; when the first electrode is a negative electrode, the second electrode is a positive electrode, and the second time length is maintained, the electrochromic layer 132 presents a light-absorbing black state. It can be understood that since the volumes of the Ag metal layer or Au metal layer formed by the reduction of Ag ions or Au ions at different times are different, they have a gradual characteristic. Therefore, the state of the electrochromic layer 132 is also related to the duration of the voltage applied to the first electrode and the second electrode. The transmittance of the electrochromic layer 132 can be adjusted according to the positive and negative directions of the voltage applied to the first electrode and the second electrode and the control of the application duration. Therefore, when the electrochromic layer 132 in the present invention is arranged on the optical path when the light emitted by the light source 120 is irradiated to the light conversion layer 131, it can adjust the transmittance of this part of the light, and then adjust the amount of light irradiated to the light conversion layer 131, thereby adjusting the conversion amount of the light, and then changing the mixing ratio of blue light, red light, green light, and yellow light, and then achieving the effect of adjusting the light output color temperature of the backlight module 100.

[0037] In addition, the electrochromic layer 132 has a bistable characteristic, that is, the electrochromic layer 132 will change its state after voltage is applied, but it can maintain the current state when the voltage is removed. Therefore, when the user needs to adjust the color temperature of the light output by the backlight module 100, it is only necessary to apply voltage for a period of time at the moment of adjustment to ensure that the voltage can be removed when the transmittance of the electrochromic layer 132 reaches the transmittance required by the user. Therefore, compared with the traditional liquid crystal operating voltage of the blue pixel that is constantly changed, the present invention will not significantly increase the power consumption of the backlight module 100 when adjusting the color temperature by setting the electrochromic layer 132. It should be noted that there are actually only two states that the electrochromic layer 132 in the present invention needs to be used in: first, when the color temperature needs to be adjusted, the electrochromic layer 132 has a certain transparency to ensure that a portion of the light can pass through the electrochromic layer 132 to irradiate the light conversion layer 131; second, when the color temperature does not need to be adjusted, all the light from the light source 120 needs to be emitted along the normal light path, and no light is required to irradiate the phosphor layer. At this time, the electrochromic layer 132 remains in a mirror state, so that it will not absorb the light emitted by the light source 120. Instead, the light directed to the electrochromic layer 132 is completely reflected by the electrochromic layer 132, so that all light can be emitted at the original color temperature.

[0038] The technical solution of the present invention is that the light conversion layer 131 is arranged relative to part of the light emitting surface of the light source 120, and the electrochromic layer 132 is arranged on the light path when the light emitted by the light source 120 irradiates the light conversion layer 131. Then, the electrochromic layer 132 can achieve different light transmission states under different voltages and different times of applying voltage, so as to adjust the amount of light irradiated on the light conversion layer 131, and then adjust the mixing ratio of the light converted into different colors by the light conversion layer 131 and the light of the original color emitted by the light source 120, so as to achieve the effect of adjusting the color temperature. In addition, since the electrochromic layer 132 has a bistable characteristic, that is, it can maintain the current state after the voltage is removed, the user only needs to apply voltage at the moment of adjusting the color temperature, and no additional voltage needs to be applied at other times, thereby achieving the effect of reducing the power consumption of the backlight module 100.

[0039] The following is a table of simulated values ​​of a backlight module 100 in different temperature adjustment states, in which the light source 120 is a blue light chip and the light conversion layer 131 is a yellow phosphor layer. It should be noted that temperature adjustment state 1, temperature adjustment state 2, temperature adjustment state 3, and temperature adjustment state 4 are temperature adjustment states when the backlight module 100 of the present invention is adopted, and the color temperature conditions of temperature adjustment state 1, temperature adjustment state 2, temperature adjustment state 3, and temperature adjustment state 4 decrease in sequence, that is, the light transmittance of the electrochromic layer in temperature adjustment state 1, temperature adjustment state 2, temperature adjustment state 3, and temperature adjustment state 4 gradually increases:

[0040]

[0041]

[0042] According to the above chart, it can be concluded that when the backlight module 100 of the present invention is used to adjust the color temperature, the overall light transmittance of the backlight module 100 remains almost unchanged, so it can be ensured that the overall brightness will not drop much when the color temperature is adjusted; while after the traditional temperature adjustment based on ACC, the overall light transmittance of the backlight module 100 is reduced by about 0.4%.

[0043] And according to simulation tests, the brightness of the backlight module 100 is also increased to a certain extent in the present invention, mainly because the human eye is more sensitive to red light and green light. In this example, the light conversion layer 131 absorbs a part of the blue light and converts it into red light and green light, so the brightness of the backlight module 100 perceived by the human eye is brighter than the original state. Therefore, this example is a better example, that is, the light source 120 is preset to a state of blue light, and the backlight is modulated from blue to yellow by controlling the state of the electrochromic layer 132, which can achieve the effect of improving the brightness without increasing too much power consumption.

[0044] In an example, please refer to Figures 1 to 3 The back panel 110 includes a bottom panel 111 and a side panel 112 connected to the bottom panel 111. The bottom panel 111 and the side panel 112 together enclose a receiving cavity. A mounting groove 1121 is formed on the side panel 112. The opening of the mounting groove 1121 faces the receiving cavity. The light source 120 is arranged on the bottom wall 1121a of the mounting groove 1121. The light conversion layer 131 and the electrochromic layer 132 are sequentially stacked on the side wall 1121b of the mounting groove 1121.

[0045] By providing a mounting groove 1121 for mounting the light source 120 on the side plate 112 of the back plate 110, the backlight module 100 in this example is an edge-entry backlight module 100. By arranging the light source 120 on the bottom wall 1121a of the mounting groove 1121, and stacking the light conversion layer 131 and the electrochromic layer 132 on the side wall 1121b of the mounting groove 1121 in sequence, when adjusting the color temperature, a part of the light emitted by the light source 120 is vertically directed to the light guide plate 140 and the optical film 150 located in the accommodating cavity, and another part of the light is directed to the electrochromic layer 132 and the light conversion layer 131 of the dimming structure 130 in sequence, so that this part of the light is converted into other colors by the light conversion layer 131 and then emitted and mixed with the light that is not converted by the light conversion layer 131 and emitted out of the backlight module 100. Specifically, the mounting groove 1121 may be a rectangular mounting groove 1121 , a trapezoidal mounting groove 1121 or a mounting groove 1121 of other shapes, as long as the light after the color conversion by the light conversion layer 131 can be mixed with the light not irradiated to the light conversion layer 131 .

[0046] Furthermore, if Figure 1 or Figure 2 As shown, the installation groove 1121 is a trapezoidal groove, and the groove opening of the installation groove 1121 gradually increases from away from the accommodating cavity to close to the accommodating cavity.

[0047] In this way, at least one side wall 1121b of the mounting groove 1121 can be oriented toward the accommodating cavity, and then the light absorbed by the light conversion layer 131 can be directly emitted to the optical components in the accommodating cavity after the color is converted in the color temperature adjustment mode, so as to ensure that the backlight module 100 has a large amount of light output, and then ensure that the light output brightness of the backlight module 100 will not be reduced too much. Specifically, only one side wall 1121b of the mounting groove 1121 is arranged toward the accommodating cavity, or the two opposite side walls 1121b (top wall and bottom wall 1121a) of the mounting groove 1121 are arranged toward the accommodating cavity.

[0048] Furthermore, if Figure 2 and Figure 3 As shown, two side panels 112 are arranged opposite to each other, and both side panels 112 are formed with installation grooves 1121. The bottom wall 1121a of each installation groove 1121 is equipped with a light source 120, and the side wall 1121b of each installation groove 1121 is stacked with a light conversion layer 131 and an electrochromic layer 132 in sequence.

[0049] In this example, the two side panels 112 arranged opposite to each other of the back panel 110 are both provided with the above-mentioned installation grooves 1121, and a light source 120 is installed in each installation groove 1121. The side walls 1121b of the installation grooves 1121 are sequentially stacked with a light conversion layer 131 and an electrochromic layer 132, so that the backlight module 100 in this example has a more uniform light output effect and better light output brightness.

[0050] Specifically, the bottom wall 1121a of the mounting groove 1121 and the side wall 1121b of the mounting groove 1121 can be vertically connected, or the bottom wall 1121a of the mounting groove 1121 and the side wall 1121b of the mounting groove 1121 are connected at an angle. When the bottom wall 1121a of the mounting groove 1121 and the side wall 1121b of the mounting groove 1121 are connected at an angle, the mounting groove 1121 is a trapezoidal groove. In order to ensure that more light can be directed to the optical component in the accommodating cavity, the notch of the mounting groove 1121 can be gradually increased from away from the accommodating cavity to close to the accommodating cavity. Among them, only one side wall 1121b of the mounting groove 1121 is arranged toward the accommodating cavity, or the two opposite side walls 1121b (top wall and bottom wall 1121a) of the mounting groove 1121 are both arranged toward the accommodating cavity.

[0051] Furthermore, if Figure 1 or Figure 2As shown, the backlight module 100 further includes a light guide plate 140 , which is disposed in the accommodating cavity and corresponds to the notch of the mounting groove 1121 .

[0052] Based on the solution that the light source 120 is arranged on the side plate 112 of the back plate 110, the backlight module 100 needs to be provided with a light guide plate 140 to change the emission direction of the light emitted by the light source 120 through the light guide plate 140 so that it can be emitted in a direction perpendicular to the bottom plate 111 of the back plate 110. The light guide plate 140 is arranged corresponding to the notch of the mounting groove 1121, which makes it easier for a part of the light emitted by the light source 120 to be directly emitted to the light guide plate 140, and also makes it easier for the light converted by the light conversion layer 131 to be emitted to the light guide plate 140, thereby increasing the amount of light emitted and improving the light brightness of the backlight module 100.

[0053] The above about Figures 1 to 3 The backlight modules 100 in the description are all edge-entry backlight modules 100 .

[0054] Of course, in other examples, please refer to Figures 4 to 7 The backlight module 100 may also be a direct-type backlight module 100 .

[0055] Specifically, in a straight backlight module 100, as Figure 4 As shown, the backplane 110 includes a base plate 111 , a plurality of light sources 120 are provided and arranged in a matrix on the base plate 111 , and a light conversion layer 131 and an electrochromic layer 132 are sequentially stacked on the base plate 111 and arranged in the gap between two adjacent light sources 120 .

[0056] By setting the light source 120 on the base plate 111, the backlight module 100 in this example is a direct-type backlight module 100. A plurality of light sources 120 are arranged in a matrix, and the structure of the OLED backlight module 100 can be formed. For example, each light source 120 can correspond to a sub-pixel, so that each light source 120 can control the luminous intensity of a sub-pixel. By stacking the light conversion layer 131 and the electrochromic layer 132 of the dimming structure 130 in sequence on the bottom plate 111 and arranging them in the gap between two adjacent light sources 120, a part of the scattered light emitted by each light source 120 can be directed to the dimming structure 130, specifically, first passes through the electrochromic layer 132, and then is directed to the light conversion layer 131. The light conversion layer 131 converts this part of the light into light of a different color from the light emitted by the light source 120, so that this part of the light whose color has been converted by the light conversion layer 131 is mixed with the light that has not been converted by the light conversion layer 131 and then emitted from the light emitting surface of the backlight module 100. In addition, by arranging the electrochromic layer 132 above the light conversion layer 131, when there is no need to adjust the color temperature, the electrochromic layer 132 can be made to be in a mirror state. On the one hand, it can ensure that the light emitted by the light source 120 is no longer emitted to the light conversion layer 131 to be converted into other colors by the light conversion layer 131. On the other hand, since the electrochromic layer 132 is arranged above the light conversion layer 131, the electrochromic layer 132 can also reflect part of the light emitted by the light source 120 toward the light emitting direction of the backlight module 100, avoiding light loss, thereby reducing the risk of a large loss in the light emitting brightness of the backlight module 100.

[0057] In another example of a vertical backlight module 100, as shown in FIG. Figure 5 As shown, the backplane 110 includes a base plate 111, a plurality of light sources 120 are provided and arranged in a matrix on the base plate 111, a plurality of dimming structures 130 are provided, and a dimming structure 130 is correspondingly arranged around a light source 120, and the light conversion layer 131 and the electrochromic layer 132 in each dimming structure 130 are stacked in sequence on the base plate 111.

[0058] By arranging the light source 120 on the bottom plate 111, the backlight module 100 in this example is also a direct-type backlight module 100. If there are multiple light sources 120 and they are arranged in a matrix, the structure of the OLED backlight module 100 can be formed. For example, each light source 120 can correspond to a sub-pixel, so that each light source 120 can control the luminous intensity of a sub-pixel. By arranging multiple dimming structures 130, and each dimming structure 130 is correspondingly arranged around the light source 120, each dimming structure 130 can adjust the mixing ratio of each color light in the light emitted by a light source 120, thereby achieving the effect of individually controlling the color temperature of each sub-pixel, and achieving the effect of partitioning and accurately adjusting the color temperature. By stacking the light conversion layer 131 and the electrochromic layer 132 of each dimming structure 130 in sequence on the base plate 111, a portion of the scattered light emitted by each light source 120 can be emitted to the dimming structure 130 surrounding it. Specifically, it first passes through the electrochromic layer 132 and then emits to the light conversion layer 131. The light conversion layer 131 converts this portion of light into light of a different color from the light emitted by the light source 120, so that the light whose color has been converted by the light conversion layer 131 is mixed with the light that has not been converted by the light conversion layer 131 and then emitted from the light emitting surface of the backlight module 100. In addition, by arranging the electrochromic layer 132 above the light conversion layer 131, when there is no need to adjust the color temperature, the electrochromic layer 132 can be made to be in a mirror state. On the one hand, it can ensure that the light emitted by the light source 120 is no longer directed to the light conversion layer 131 to be converted into other colors by the light conversion layer 131. On the other hand, since the electrochromic layer 132 is arranged above the light conversion layer 131, the electrochromic layer 132 can also reflect part of the light emitted by the light source 120 toward the light emitting direction of the backlight module 100 to avoid light loss, thereby reducing the risk of a large loss in the light emitting brightness of the backlight module 100. Specifically, the electrochromic layer 132 and the light conversion layer 131 in each dimming structure 130 can be annular, such as a circular ring, a rectangular ring or other polygonal ring structures, and the light source 120 is arranged in the middle of the annular electrochromic layer 132 and the light conversion layer 131. A gap is formed between two adjacent dimming structures 130 to avoid the risk of being unable to control each sub-pixel individually due to the two dimming structures 130 being connected in series.

[0059] In another example of a straight-down backlight module 100, please refer to Figure 6 and Figure 7 The backplane 110 includes a base plate 111 , a plurality of light sources 120 are provided and arranged in a matrix on the base plate 111 , each light source 120 is surrounded by a plurality of dimming structures 130 arranged in a ring array, and the electrochromic layer 132 in each dimming structure 130 is wrapped around the light conversion layer 131 .

[0060] In this example, each light source 120 is surrounded by a plurality of dimming structures 130 arranged in a ring array, and the plurality of dimming structures 130 arranged in a ring array are spaced apart from each other. Specifically, each dimming structure 130 is in a dot-shaped, spherical, or block-shaped shape as a whole. Furthermore, by wrapping the electrochromic layer 132 in each dimming structure 130 outside the light conversion layer 131, the risk of the light emitted by the light source 120 bypassing the electrochromic layer 132 and directly emitting to the light conversion layer 131 can be further avoided, thereby ensuring better adjustment accuracy when adjusting the color temperature, and avoiding the risk of a portion of the light emitted by the light source 120 leaking to the light conversion layer 131 and being converted when the color temperature is not adjusted.

[0061] Furthermore, when each light source 120 corresponds to a sub-pixel, the color temperature of the light emitted by each sub-pixel can be adjusted, and the color temperature can be precisely adjusted by region. Specifically, two adjacent light sources 120 can share a dimming structure 130, or two dimming structures 130 are provided between two adjacent light sources 120, and the two dimming structures 130 are respectively used to adjust the color temperature of the light emitted by different light sources 120.

[0062] Further, please refer to Figure 6 and Figure 7 , the light conversion layer 131 and the electrochromic layer 132 are both hemispherical.

[0063] By setting both the light conversion layer 131 and the electrochromic layer 132 to be hemispherical, it is more conducive to the light conversion layer 131 to absorb, convert and emit light, thereby achieving a better effect of adjusting the color temperature.

[0064] Embodiment 2:

[0065] The present invention also provides a display device, please refer to Figures 8 to 10 The display device includes a backlight module 100 and a display panel 200. The specific structure of the backlight module 100 refers to the above embodiment. Since the display device adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here. Among them, the backlight module 100 is arranged on the light incident side of the display panel 200.

[0066] The display device of the present invention includes a backlight module 100 and a display panel 200. The backlight module 100 is disposed on the light incident side of the display panel 200 so that the backlight module 100 is used to provide the display panel 200 with a light source 120, thereby ensuring that the display panel 200 can display a display image with sufficient brightness for the user to watch. In addition, when the display device includes the above-mentioned backlight module 100, the effect of adjusting the color temperature can be achieved without increasing excessive power consumption.

[0067] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A backlight module, comprising a back plate and a light source arranged on the back plate, characterized in that: The backlight module further includes a dimming structure, and the dimming structure includes: a light conversion layer, the light conversion layer being disposed on the back plate and arranged opposite to a portion of the light emitting surface of the light source; and An electrochromic layer, which is disposed on the optical path of the light emitted by the light source when irradiating the light conversion layer, and is used to adjust the transmittance of the light emitted by the light source when irradiating the light conversion layer; The back panel includes a bottom panel and a side panel connected to the bottom panel, the bottom panel and the side panel together enclose a receiving cavity, a mounting groove is formed on the side panel, and the opening of the mounting groove faces the receiving cavity; the light source is arranged on the bottom wall of the mounting groove, the light conversion layer and the electrochromic layer are sequentially stacked on the side wall of the mounting groove, and the electrochromic layer is arranged on the side of the light conversion layer away from the side wall of the mounting groove.

2. The backlight module according to claim 1, characterized in that: The installation groove is a trapezoidal groove, and the groove opening of the installation groove gradually increases from a direction away from the accommodating cavity to a direction close to the accommodating cavity.

3. The backlight module according to claim 1, wherein: Two side panels are arranged opposite to each other, and the two side panels are formed with the installation groove. The bottom wall of each installation groove is installed with the light source, and the side wall of each installation groove is sequentially stacked with the light conversion layer and the electrochromic layer.

4. The backlight module according to any one of claims 1 to 3, characterized in that: The backlight module further comprises a light guide plate, which is arranged in the accommodating cavity and corresponds to the notch of the mounting groove.

5. A backlight module, comprising a back plate and a light source arranged on the back plate, characterized in that: The backlight module further includes a dimming structure, and the dimming structure includes: a light conversion layer, the light conversion layer being disposed on the back plate and arranged opposite to a portion of the light emitting surface of the light source; and An electrochromic layer, which is disposed on the optical path of the light emitted by the light source when irradiating the light conversion layer, and is used to adjust the transmittance of the light emitted by the light source when irradiating the light conversion layer; The back plate includes a bottom plate, and the light sources are provided in plurality and arranged in a matrix on the bottom plate; The light conversion layer and the electrochromic layer are sequentially stacked on the base plate and arranged between two adjacent light sources, and the electrochromic layer is arranged on the side of the light conversion layer away from the base plate; or, there are multiple dimming structures, one dimming structure is correspondingly arranged around one light source, and the light conversion layer and the electrochromic layer in each dimming structure are sequentially stacked on the base plate, and the electrochromic layer is arranged on the side of the light conversion layer away from the base plate.

6. A backlight module, comprising a back plate and a light source arranged on the back plate, characterized in that: The backlight module further includes a dimming structure, and the dimming structure includes: a light conversion layer, the light conversion layer being disposed on the back plate and arranged opposite to a portion of the light emitting surface of the light source; and An electrochromic layer, which is disposed on the optical path of the light emitted by the light source when irradiating the light conversion layer, and is used to adjust the transmittance of the light emitted by the light source when irradiating the light conversion layer; The backplane includes a base plate, and the light sources are provided in plurality and arranged in a matrix on the base plate. Each of the light sources is surrounded by a plurality of dimming structures arranged in a ring array, and the electrochromic layer in each of the dimming structures is wrapped outside the light conversion layer.

7. The backlight module according to claim 6, wherein: The light conversion layer and the electrochromic layer are both hemispherical.

8. A display device, characterized in that: The invention comprises a display panel and the backlight module according to any one of claims 1 to 7, wherein the backlight module is arranged on the light incident side of the display panel.

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