Electrowetting film layer, backlight module and display device

Abstract

The present application discloses an electro-wetting film layer, a backlight module and a display device. The electro-wetting film layer includes a first substrate, a second substrate, a plurality of dimming units, a surface electrode and a plurality of electrode groups; the second substrate is disposed opposite to the first substrate; the plurality of dimming units are located between the first substrate and the second substrate; each dimming unit includes a storage area and an opening area, the storage area is provided with a storage cavity, and a color-tuning liquid is stored in the storage cavity; the surface electrode is disposed on the surface of the first substrate close to the second substrate; the plurality of electrode groups are disposed on the surface of the second substrate close to the first substrate, and the plurality of electrode groups are arranged in one-to-one correspondence with the plurality of dimming units; the surface electrode, the electrode groups and the driving circuit cooperate to control the amount of the color-tuning liquid moving to the opening area in the storage cavity and the hydrophilic state of the color-tuning liquid, and the color-tuning liquid in the opening area is irradiated by a light source to emit or absorb light, so as to realize the adjustment of the color gamut.

Description

Technical Field

[0001] The present application relates to the field of display technologies, and particularly to an electro-wetting film layer, a backlight module, and a display device. Background Art

[0002] Liquid crystal displays usually have a color gamut adjustment function, which is generally achieved by means of stepping down the liquid crystal driving voltage or adjusting the backlight current. However, these methods can generally only adjust the color gamut downward and cannot adjust it upward. Summary of the Invention

[0003] The electro-wetting film layer, the backlight module, and the display device provided by the present application provide a new way of color gamut adjustment.

[0004] To solve the above technical problems, the first technical solution provided by the present application is: to provide an electro-wetting film layer for a backlight module, including a first substrate, a second substrate, a plurality of dimming units, a surface electrode, and a plurality of electrode groups; the second substrate is disposed opposite to the first substrate; the plurality of dimming units are located between the first substrate and the second substrate; each dimming unit includes a storage area and an opening area, the storage area is provided with a storage cavity, and a color adjustment liquid is stored in the storage cavity; the surface electrode is disposed on the surface of the first substrate close to the second substrate; the plurality of electrode groups are disposed on the surface of the second substrate close to the first substrate; the plurality of electrode groups are arranged in one-to-one correspondence with the plurality of dimming units; the surface electrode, the electrode groups, and a driving circuit cooperate to control the amount of the color adjustment liquid moving from the storage cavity to the opening area and the hydrophilic state of the color adjustment liquid.

[0005] In one embodiment, the electrode group includes a first strip-shaped electrode and a second strip-shaped electrode, the first strip-shaped electrode is disposed corresponding to the storage cavity, and the second strip-shaped electrode is disposed corresponding to the opening area.

[0006] In one embodiment, the electrode further includes a third strip-shaped electrode; the dimming unit further includes a buffer area, the opening area is communicated with the storage cavity through the buffer area, and the third strip-shaped electrode is disposed corresponding to the buffer area.

[0007] In one embodiment, the opening area, the buffer area, and the storage area are arranged side by side in sequence, and the second strip-shaped electrode, the third strip-shaped electrode, and the first strip-shaped electrode are arranged side by side in sequence.

[0008] In one embodiment, the width of the first strip-shaped electrode is smaller than the width of the second strip-shaped electrode, the width of the third strip-shaped electrode is smaller than the width of the first strip-shaped electrode, and the first strip-shaped electrode, the second strip-shaped electrode, and the third strip-shaped electrode are coplanar.

[0009] In one embodiment, it further includes a plurality of light-blocking blocks. The light-blocking blocks are disposed on the surface of the second substrate away from the first substrate, and the light-blocking blocks cover the storage cavity and the buffer area.

[0010] In one embodiment, it further includes a plurality of light-blocking blocks. The light-blocking blocks are disposed on the surface of the second substrate away from the first substrate, and the light-blocking blocks cover the storage cavity.

[0011] In one embodiment, a first hydrophobic layer is provided on the surface of the surface electrode close to the second substrate, a second hydrophobic layer is provided on the surface of the plurality of electrode groups close to the first substrate, and both ends of the cavity wall of the storage cavity are in contact with the first hydrophobic layer and the second hydrophobic layer respectively.

[0012] To solve the above technical problems, the second technical solution provided by this application is: to provide a backlight module, including a back plate, a light guide plate, and an electrowetting film layer; the light guide plate is disposed on one side of the back plate; the electrowetting film layer is the electrowetting film layer described in any one of the above, and is disposed on the surface of the light guide plate away from the back plate or on the side surface of the light guide plate.

[0013] To solve the above technical problems, the third technical solution provided by this application is: to provide a display device, including a display panel and a backlight module; the display panel includes a plurality of pixels and a driving circuit; each pixel includes a plurality of sub-pixels; the backlight module is the backlight module described above, and is disposed on one side of the display panel; wherein, each dimming unit of the backlight module corresponds to one sub-pixel or one pixel; the driving circuit outputs different voltages to at least some of the plurality of dimming units.

[0014] The beneficial effects of this application: Different from the prior art, this application discloses an electrowetting film layer, a backlight module, and a display device. The electrowetting film layer includes a first substrate, a second substrate, a plurality of dimming units, a surface electrode, and a plurality of electrode groups; the second substrate is disposed opposite to the first substrate; the plurality of dimming units are located between the first substrate and the second substrate; each dimming unit includes a storage area and an opening area, a storage cavity is provided in the storage area, and a color mixing liquid is stored in the storage cavity; the surface electrode is disposed on the surface of the first substrate close to the second substrate; the plurality of electrode groups are disposed on the surface of the second substrate close to the first substrate, and the plurality of electrode groups are arranged in one-to-one correspondence with the plurality of dimming units; the surface electrode, the electrode groups, and the driving circuit cooperate to control the amount of the color mixing liquid moving to the opening area in the storage cavity and the hydrophilic state of the color mixing liquid. The color mixing liquid in the opening area is irradiated by a light source, emits or absorbs light, and realizes the adjustment of the color gamut. Description of the Drawings

[0015] To more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the accompanying drawings required for the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0016] Figure 1 It is a schematic structural diagram of the first embodiment of the electro-wetting film layer provided by the present application;

[0017] Figure 2 is Figure 1 a schematic structural diagram of the multiple electrode groups shown;

[0018] Figure 3 It is a schematic structural diagram of the second embodiment of the electro-wetting film layer provided by the present application;

[0019] Figure 4 is Figure 3 a schematic structural diagram of the multiple electrode groups shown;

[0020] Figure 5 It is a schematic structural diagram of the first embodiment of the backlight module provided by the present application;

[0021] Figure 6 It is a schematic structural diagram of the second embodiment of the backlight module provided by the present application;

[0022] Figure 7 It is a schematic structural diagram of the third embodiment of the backlight module provided by the present application;

[0023] Figure 8 It is a schematic structural diagram of the display device provided by the embodiments of the present application. Detailed implementation manners

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present application in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, rather than all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0025] In the following description, specific details such as specific system structures, interfaces, and technologies are presented for the purpose of illustration rather than limitation, so as to thoroughly understand the present application.

[0026] The terms "first", "second", and "third" in this application are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first", "second", and "third" may explicitly or implicitly include at least one of the said features. In the description of this application, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined. All directional indications (such as up, down, left, right, front, back...) in the embodiments of this application are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly. The terms "comprise" and "have" and any variations thereof in the embodiments of this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally further include steps or units not listed, or may optionally further include other steps or components inherent to these processes, methods, products, or devices.

[0027] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in connection with the embodiments can be included in at least one embodiment of this application. The phrase appearing in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0028] The following provides a detailed description of this application in conjunction with the drawings and embodiments.

[0029] Please refer to Figure 1 and Figure 2 , Figure 1 which is a schematic structural diagram of the first embodiment of the electro-wetting film layer provided by this application, Figure 2 is Figure 1 a schematic structural diagram of the multiple electrode groups shown in

[0030] The electro-wetting film layer 11 includes a first substrate 111, a second substrate 112, multiple light-adjusting units 113, a surface electrode 114, and multiple electrode groups 115.

[0031] The second substrate 112 is disposed opposite to the first substrate 111. Optionally, the first substrate 111 and the second substrate 112 are transparent substrates; for example, glass, plastic. Optionally, the first substrate 111 and the second substrate 112 are disposed parallel to each other.

[0032] A plurality of dimming units 113 are located between the first substrate 111 and the second substrate 112. Each dimming unit 113 includes a storage area 1131 and an opening area 1132. The storage area 1131 is provided with a storage cavity 1131a, and a color-tuning liquid is stored in the storage cavity 1131a. The color-tuning liquid includes at least one of quantum dots or absorption dyes and fluorescent materials. That is to say, the color-tuning liquid is composed of a material dispersion that can achieve high-color gamut display. Optionally, the cavity wall of the storage cavity 1131a has hydrophobic properties. Optionally, hydrophobic layers are provided at both ends of the cavity wall of the storage cavity 1131a. Optionally, the cavity wall of the storage cavity 1131a is an electronic paper.

[0033] The surface electrode 114 is provided on the surface of the first substrate 111 close to the second substrate 112; the surface electrode 114 is a transparent electrode. A plurality of electrode groups 115 are provided on the surface of the second substrate 112 close to the first substrate 111, and the plurality of electrode groups 115 are arranged in one-to-one correspondence with the plurality of dimming units 113. The surface electrode 114 and the electrode groups 115 cooperate with the driving circuit to control the amount of the color-tuning liquid moving to the opening area 1132 in the storage cavity 1131a and the hydrophilic state of the color-tuning liquid. The color-tuning liquid in the opening area 1132 is irradiated by the light source 14 (the light source 14 is the light source 14 of the backlight module 1 introduced later), emits or absorbs light, and realizes the adjustment of the color gamut; for example, the color-tuning liquid in the opening area 1132 can emit narrow-peak RG light after being irradiated by the light source, improving the color gamut of the display device. Among them, the surface electrode 114 and the electrode groups 115 are connected to the driving circuit (the driving circuit is located outside the electro-wetting film layer 11) through traces, and the magnitude of the voltage applied to each electrode group 115 can be controlled by a passive driving method, thereby controlling the amount of the color-tuning liquid moving to the opening area 1132 and the hydrophilic state of the color-tuning liquid.

[0034] It should be noted that the principle of the color-tuning liquid to achieve color gamut adjustment is to utilize the hydrophobic and hydrophilic properties of the liquid under energization or non-energization to realize the movement of the liquid or the control of the contact area between the liquid and the first substrate 111 and the second substrate 112. By applying an electrical signal to the surface electrode 114 and different electrical signals to different electrode groups 115, the movement of the color-tuning liquid from the storage cavity 1131a to the opening area 1132 and the amount of movement are controlled, or the movement of the color-tuning liquid from the opening area 1132 to the storage cavity 1131a and the amount of movement are controlled, or the hydrophilic state of the color-tuning liquid in the storage cavity 1131a and / or the opening area 1132 is controlled. When color gamut adjustment is not required, the color-tuning liquid is all stored in the storage cavity 1131a, and there is no color-tuning liquid in the opening area 1132. That is to say, the electro-wetting film layer 11 provided in this application can also be used as a switch for color gamut adjustment.

[0035] The electrode group 115 includes a first strip-shaped electrode 1151 and a second strip-shaped electrode 1152. The first strip-shaped electrode 1151 is correspondingly arranged with the storage cavity 1131a, and the second strip-shaped electrode 1152 is correspondingly arranged with the opening area 1132. The first strip-shaped electrode 1151 is a transparent electrode, and the second strip-shaped electrode 1152 is a transparent electrode. An electrical signal is applied to the first strip-shaped electrode 1151 through a driving circuit to control the hydrophilic state of the color-tuning liquid in the storage cavity 1131a and the amount flowing to the opening area 1132. An electrical signal is applied to the second strip-shaped electrode 1152 through a driving circuit to control the hydrophilic state of the color-tuning liquid in the opening area 1132, so that the light of the light source 14 can pass through the color-tuning liquid evenly. It can be understood that since each electrode group 115 is independently controlled, the adjustment of the color gamut in sub-regions can be realized, and the size of the sub-regions is designed according to needs.

[0036] Optionally, the width of the first strip-shaped electrode 1151 is smaller than the width of the second strip-shaped electrode 1152, and the first strip-shaped electrode 1151 and the second strip-shaped electrode 1152 are arranged coplanarly.

[0037] Optionally, the storage area 1131 and the opening area 1132 are arranged side by side, and the first strip-shaped electrode 1151 and the second strip-shaped electrode 1152 are arranged side by side.

[0038] Optionally, the shape of the first strip-shaped electrode 1151 is a first rectangle, and the shape of the second strip-shaped electrode 1152 is a second rectangle. The length of the first rectangle is the same as the length of the second rectangle, and the width of the first rectangle is smaller than the width of the second rectangle. Exemplarily, the first strip-shaped electrode 1151 and the second strip-shaped electrode 1152 are aligned and arranged side by side along their width directions.

[0039] Optionally, multiple electrode groups 115 are arranged coplanarly.

[0040] Optionally, multiple dimming units 113 are arranged in an array; Exemplarily, multiple dimming units 113 are arranged in a square array, arranged in multiple rows and multiple columns. Correspondingly, multiple electrode groups 115 are arranged in an array, and their arrangement manner is the same as that of the dimming units 113.

[0041] Continue to refer to Figure 1 , the electro-wetting film layer 11 further includes a first hydrophobic layer 116, a second hydrophobic layer 117, and multiple light-blocking blocks 118 that are opaque.

[0042] A first hydrophobic layer 116 is provided on the surface of the planar electrode 114 close to the second substrate 112, a second hydrophobic layer 117 is provided on the surface of the plurality of electrode groups 115 close to the first substrate 111, and both ends of the cavity wall of the storage cavity 1131a are in contact with the first hydrophobic layer 116 and the second hydrophobic layer 117 respectively. The color-tuning liquid does not contact the planar electrode 114 and the electrode groups 115, and the color-tuning liquid contacts the first hydrophobic layer 116 and / or the second hydrophobic layer 117.

[0043] The shielding block 118 is provided on the surface of the second substrate 112 away from the first substrate 111, and the shielding block 118 covers the storage cavity 1131a to prevent the light emitted when the light source 14 irradiates the color-tuning liquid in the storage cavity 1131a from affecting the normal display effect when the display device does not need to perform color gamut adjustment. Optionally, the shielding block 118 is black.

[0044] Please refer to Figure 3 and Figure 4 , Figure 3 which is a schematic structural diagram of the second embodiment of the electro-wetting film layer provided by the present application, Figure 4 is Figure 3 a schematic structural diagram of the plurality of electrode groups shown in

[0045] The structure of the second embodiment of the electro-wetting film layer 11 is basically the same as that of the first embodiment of the electro-wetting film layer 11, the difference being that: each dimming unit 113 further includes a buffer area 1133, and each electrode group 115 further includes a third strip-shaped electrode 1153; specifically, the opening area 1132 communicates with the storage cavity 1131a through the buffer area 1133, and the third strip-shaped electrode 1153 is correspondingly arranged with the buffer area 1133.

[0046] By providing the buffer area 1133, the color-tuning liquid in the storage cavity 1131a of the storage area 1131 is gradually divided and transported to the opening area 1132 in the buffer area 1133 to control the amount of the color-tuning liquid in the opening area 1132, so as to control the amplitude of the color gamut adjustment, and further achieve a better color-tuning effect. By applying an electric signal to the third strip-shaped electrode 1153 through a driving circuit, the amount of the divided color-tuning liquid and the hydrophilic state of the color-tuning liquid in the buffer area 1133 are controlled.

[0047] Optionally, the opening area 1132, the buffer area 1133, and the storage area 1131 are arranged side by side in sequence, and the second strip-shaped electrode 1152, the third strip-shaped electrode 1153, and the first strip-shaped electrode 1152 are arranged side by side in sequence.

[0048] Optionally, the size width of the first strip-shaped electrode 1151 is greater than the width of the second strip-shaped electrode 1152, the width of the third strip-shaped electrode 1153 is less than the width of the first strip-shaped electrode 1151, and the first strip-shaped electrode 1151, the second strip-shaped electrode 1152, and the third strip-shaped electrode 1153 are coplanar.

[0049] Optionally, the shape of the first strip-shaped electrode 1151 is a first rectangle, the shape of the second strip-shaped electrode 1152 is a second rectangle, the length of the first rectangle is the same as the length of the second rectangle, and the width of the first rectangle is less than the width of the second rectangle. The shape of the third strip-shaped electrode 1153 is a third rectangle, the length of the third rectangle is less than the length of the first rectangle, and the width of the third rectangle is less than the width of the first rectangle. Exemplarily, the first strip-shaped electrode 1151 and the second strip-shaped electrode 1152 are aligned along their width directions and arranged side by side, and the third strip-shaped electrode 1153 is located between the first strip-shaped electrode 1151 and the second strip-shaped electrode 1152.

[0050] Continue to refer to Figure 3 , in this embodiment, the shielding block 118 covers the storage cavity 1131a and the buffer area 1133 to prevent the light emitted from the light source 14 irradiating the color mixing liquid in the storage cavity 1131a and the buffer area 1133 from affecting the normal display effect when the display device does not need to perform color gamut adjustment.

[0051] Please refer to Figure 5 , Figure 5 is a schematic structural diagram of the first embodiment of the backlight module provided by the present application.

[0052] The backlight module 1 includes an electro-wetting film layer 11, a back plate 12, a light guide plate 13, a light source 14, a reflective layer 15, and a backlight optical film layer 16. The light guide plate 13 is disposed on one side of the back plate 12. The reflective layer 15 is disposed between the back plate 12 and the light guide plate 13. The light source 14 is disposed on the side of the light guide plate 13. The electro-wetting film layer 11 is disposed on the side of the light guide plate 13, and the electro-wetting film layer 11 is located between the light guide plate 13 and the light source 14. The backlight optical film layer 16 is disposed on the surface of the light guide plate 13 away from the back plate 12; the backlight optical film layer 16 includes an upper and lower diffusion sheet, a prism sheet, etc., and specific details can be referred to the prior art. By disposing the electro-wetting film layer 11 on the side of the light guide plate 13 of the backlight module 1, color gamut adjustment for the entire surface of the display device is achieved. It can be understood that the structure of the electro-wetting film layer 11 can be referred to the introduction of any of the above embodiments and will not be elaborated here.

[0053] Please refer to Figure 6 , Figure 6 is a schematic structural diagram of the second embodiment of the backlight module provided by the present application.

[0054] The backlight module 1 includes an electrowetting film layer 11, a backplane 12, a light guide plate 13, a light source 14, a reflective layer 15, and a backlight optical film layer 16. The light guide plate 13 is disposed on one side of the backplane 12. The reflective layer 15 is disposed between the backplane 12 and the light guide plate 13. The light source 14 is disposed on the side surface of the light guide plate 13. The electrowetting film layer 11 is disposed on the surface of the light guide plate 13 away from the backplane 12. The backlight optical film layer 16 is disposed on the surface of the electrowetting film layer 11 away from the backplane 12; the backlight optical film layer 16 includes an upper and lower diffusion sheet, a prism sheet, etc., and specific details can be referred to the prior art. By providing the electrowetting film layer 11 on the surface of the light guide plate 13 of the backlight module 1 away from the backplane 12, the color gamut adjustment of the entire surface of the display device is realized. In this embodiment, the setting position of the electrowetting film layer 11, combined with the independent control of the multiple electrode groups 115 of the electrowetting film layer 11, realizes the zonal color gamut adjustment. It can be understood that the structure of the electrowetting film layer 11 can be referred to the introduction of any of the above embodiments, and will not be elaborated here.

[0055] Please refer to Figure 7 , Figure 7 which is a schematic structural diagram of the third embodiment of the backlight module provided by the present application.

[0056] The backlight module 1 includes an electrowetting film layer 11, a backplane 12, a light guide plate 13, a light source 14, and a backlight optical film layer 16. The light guide plate 13 is disposed on one side of the backplane 12. The light source 14 is disposed on the surface of the backplane 12 close to the light guide plate 13. The electrowetting film layer 11 is disposed on the surface of the light guide plate 13 away from the backplane 12. The backlight optical film layer 16 is disposed on the surface of the electrowetting film layer 11 away from the backplane 12; the backlight optical film layer 16 includes an upper and lower diffusion sheet, a prism sheet, etc., and specific details can be referred to the prior art. By providing the electrowetting film layer 11 on the surface of the light guide plate 13 of the backlight module 1 away from the backplane 12, the color gamut adjustment of the entire surface of the display device is realized. In this embodiment, the setting position of the electrowetting film layer 11, combined with the independent control of the multiple electrode groups 115 of the electrowetting film layer 11, realizes the zonal color gamut adjustment. It can be understood that the structure of the electrowetting film layer 11 can be referred to the introduction of any of the above embodiments, and will not be elaborated here.

[0057] Please refer to Figure 8 , Figure 8 which is a schematic structural diagram of the display device provided by the embodiment of the present application.

[0058] The display device includes a backlight module 1 and a display panel 2. The backlight module 1 is disposed on one side of the display panel 2. The structure of the backlight module 1 can be referred to the description of any of the above embodiments and will not be elaborated herein. The display panel 2 includes a plurality of pixels (not shown in the figure) and a driving circuit (not shown in the figure); each pixel includes a plurality of sub-pixels. For example, each pixel includes a red sub-pixel (R), a blue sub-pixel (B), and a green sub-pixel (G). When the electro-wetting film layer 11 is disposed on the surface of the light guide plate 13 away from the substrate 12, each dimming unit 113 of each backlight module 1 is provided corresponding to a pixel or a sub-pixel, and the driving circuit outputs different voltages to at least some of the plurality of dimming units 113 to achieve the regulation of the color gamut of sub-regions on the basis of the regulation of the whole-color gamut of the display device, and the size of the sub-regions is designed according to specific requirements.

[0059] The above are only the embodiments of the present application, and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present application, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present application.

Claims

1. An electrowetting film layer for a backlight module, characterized in that, Comprising: A first substrate; A second substrate, disposed opposite to the first substrate; A plurality of dimming units, located between the first substrate and the second substrate; each of the dimming units includes a storage area, an opening area, and a buffer area, the storage area is provided with a storage cavity, and a color - adjusting liquid is stored in the storage cavity; The opening area communicates with the storage cavity through the buffer area; A planar electrode, disposed on the surface of the first substrate close to the second substrate; A plurality of electrode groups, disposed on the surface of the second substrate close to the first substrate; The plurality of electrode groups are arranged in one - to - one correspondence with the plurality of dimming units; each electrode group includes a first strip - shaped electrode, a second strip - shaped electrode, and a third strip - shaped electrode, the first strip - shaped electrode is disposed corresponding to the storage cavity, the second strip - shaped electrode is disposed corresponding to the opening area, and the third strip - shaped electrode is disposed corresponding to the buffer area; The planar electrode, the electrode group, and a driving circuit cooperate to control the amount of the color - adjusting liquid moving from the storage cavity to the opening area and the hydrophilic state of the color - adjusting liquid.

2. The electrowetting film layer according to claim 1, wherein The opening area, the buffer area, and the storage area are arranged side by side in sequence, and the second strip - shaped electrode, the third strip - shaped electrode, and the first strip - shaped electrode are arranged side by side in sequence.

3. The electrowetting film layer according to claim 1, wherein The width of the first strip - shaped electrode is less than the width of the second strip - shaped electrode, the width of the third strip - shaped electrode is less than the width of the first strip - shaped electrode, and the first strip - shaped electrode, the second strip - shaped electrode, and the third strip - shaped electrode are coplanar.

4. The electro-wetting film layer according to claim 1, wherein Further comprising a plurality of light - impermeable shielding blocks, the shielding blocks are disposed on the surface of the second substrate away from the first substrate, and the shielding blocks cover the storage cavity and the buffer area.

5. The electro-wetting film layer according to claim 1, wherein, Further comprising a plurality of light - impermeable shielding blocks, the shielding blocks are disposed on the surface of the second substrate away from the first substrate, and the shielding blocks cover the storage cavity.

6. The electrowetting film layer according to claim 1, wherein A first hydrophobic layer is disposed on the surface of the planar electrode close to the second substrate, a second hydrophobic layer is disposed on the surface of the plurality of electrode groups close to the first substrate, and both ends of the cavity wall of the storage cavity are in contact with the first hydrophobic layer and the second hydrophobic layer respectively.

7. A backlight module, characterized in that, Comprising: A backplane; A light - guide plate, disposed on one side of the backplane; The electrowetting film layer according to any one of claims 1 - 6, disposed on the surface of the light - guide plate away from the backplane or on the side surface of the light - guide plate.

8. A display device, characterized in that, Comprising: A display panel, including a plurality of pixels and a driving circuit; each pixel includes a plurality of sub - pixels; The backlight module according to claim 7, disposed on one side of the display panel; wherein, each dimming unit of the backlight module corresponds to one sub - pixel or one pixel; and the driving circuit outputs different voltages to at least some of the plurality of dimming units.

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