Optical film, backlight module, display panel and display device

Abstract

The application belongs to the field of display, and particularly relates to an optical film, a backlight module, a display panel and a display device. The optical film is used for converting part of first color light into second color light. The optical film comprises a color conversion film layer, and the color conversion film layer comprises a center region and a side region. The side region is located on at least two opposite sides of the center region. When the first color light is white light and the second color light is one of three primary colors, the side region has color conversion material, and the density of the color conversion material gradually increases from inside to outside. When the first color light is one of three primary colors and the second color light is white light, the side region has color conversion material, and the density of the color conversion material gradually decreases from inside to outside. The optical film can convert part of light passing through the side region of the backlight module into light with one of three primary colors gradually deepening, compensate for light with a first attenuation rate of transmittance with an increase of a viewing angle, and improve the color cast problem of the side region.

Description

Technical Field

[0001] This application belongs to the field of display technology, specifically relating to an optical film, a backlight module, a display panel, and a display device. Background Technology

[0002] With the development of display technology, Thin Film Transistor Liquid Crystal Display (TFT-LCD) panels have become widely used in the display field due to their advantages such as high image quality, energy saving, thin body, and mature and stable manufacturing process. Large-size display panels are widely used in televisions, commercial advertising, video surveillance, and conference display screens.

[0003] For large-size display panels, viewing the center area directly in front of the panel is a narrow viewing angle, resulting in good display quality and no color shift issues. However, viewing the sides of the panel is a wide viewing angle, which typically leads to color shift issues in these areas, affecting the display quality. For example, in vertically aligned (VA) display panels, as the viewing angle increases, the transmittance of blue light decreases significantly before that of green and red light, resulting in a yellowish tint in the side areas. Summary of the Invention

[0004] The purpose of this application is to provide an optical film, a backlight module, a display panel, and a display device to improve the problem of color shift in the side area.

[0005] To achieve the above objectives, this application provides an optical film for at least converting a portion of a first-color light into a second-color light. The optical film includes a color conversion film layer, which includes a color conversion material capable of converting the first-color light into the second-color light. The color conversion film layer comprises:

[0006] Central area;

[0007] Side regions, located at least on opposite sides of the central region;

[0008] Wherein, when the first color light is white light and the second color light is one of the three primary colors, the side region has the color conversion material, and the density of the color conversion material gradually increases from the side closer to the center region to the side farther from the center region; when the first color light is one of the three primary colors and the second color light is white light, the side region has the color conversion material, and the density of the color conversion material gradually decreases from the side closer to the center region to the side farther from the center region; the center region has the color conversion material and the center region can convert all of the three primary colors into white light.

[0009] Optionally, the central region may include a rectangular region, a rounded rectangular region, a circular region, or an elliptical region.

[0010] Optionally, the color conversion material includes a filter material, the density of which gradually increases from the side closer to the central region to the side farther from the central region, and the color of the filter material in the side region gradually deepens.

[0011] Optionally, the second color light is blue light.

[0012] Optionally, the optical film further includes a functional layer, which includes a diffusion film, a brightness enhancement film, or a polarizing film, and the color conversion film is disposed on one side of the functional layer or the color conversion film is the functional layer.

[0013] Optionally, the color conversion material includes phosphor, the density of which gradually decreases from the side closer to the central region to the side farther away from the central region.

[0014] Optionally, the first color light is blue light, and the phosphor includes yellow phosphor.

[0015] This application also provides a backlight module, including:

[0016] light source substrate;

[0017] The optical film is disposed on the light-emitting side of the light source substrate.

[0018] This application also provides a display panel, including:

[0019] An array substrate, including a first substrate;

[0020] A counter substrate is disposed opposite to the array substrate. The counter substrate includes a second substrate and a color filter layer formed on the side of the second substrate near the array substrate. Alternatively, the array substrate includes the color filter layer, which is formed on the side of the first substrate near the counter substrate.

[0021] The optical film is disposed on the side of the color filter layer near the first substrate.

[0022] This application also provides a display device, including:

[0023] Backlight assembly;

[0024] A panel assembly is disposed on the light-emitting side of the backlight assembly;

[0025] The optical film is disposed on the light-emitting side of the light-emitting chip of the backlight assembly, on the side of the color filter layer of the panel assembly near the backlight assembly, or between the backlight assembly and the panel assembly.

[0026] The optical film, backlight module, display panel, and display device disclosed in this application have the following beneficial effects:

[0027] In this application, an optical film is used to convert at least a portion of a first-color light into a second-color light. The optical film includes a color conversion film layer, which includes a color conversion material. The color conversion material is capable of converting the first-color light into the second-color light. The color conversion film layer includes a central region and side regions, with the side regions located at least on opposite sides of the central region. When the first-color light is white light and the second-color light is one of the three primary colors, the side regions have the color conversion material, and the density of the color conversion material gradually increases from the inside to the outside. When the first-color light is one of the three primary colors and the second-color light is white light, the side regions have the color conversion material, and the density of the color conversion material gradually decreases from the inside to the outside. The optical film is used in a back module, display panel, or display device. The optical film can convert a portion of the light passing through the side regions of the backlight assembly into light with a gradually deepening color of one of the three primary colors, compensating for the light whose transmittance decreases first as the viewing angle increases, and improving the color shift problem in the side regions.

[0028] Other features and advantages of this application will become apparent from the following detailed description, or may be learned in part from practice of this application.

[0029] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0030] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0031] Figure 1 This is a schematic diagram of the structure of the optical film in Embodiment 1 of this application.

[0032] Figure 2 This is a schematic diagram of the structure of the optical film in Embodiment 2 of this application.

[0033] Figure 3 This is a schematic diagram of the structure of the optical film in Embodiment 3 of this application.

[0034] Figure 4This is a schematic diagram of the backlight module in Embodiment 4 of this application.

[0035] Figure 5 This is a schematic diagram of the display panel structure in Embodiment 5 of this application.

[0036] Figure 6 This is a schematic diagram of the optical film improving color shift in Embodiment 5 of this application.

[0037] Figure 7 This is a schematic diagram of the display device in Embodiment Six of this application.

[0038] Explanation of reference numerals in the attached figures:

[0039] 100. Optical film; 110. Color conversion film layer; 111. Central area; 112. Side area; 120. Functional layer;

[0040] 200. Backlight module; 210. Light source substrate; 211. Driver backplane; 212. Light-emitting chip;

[0041] 300, Display panel; 310, Array substrate; 311, First substrate; 312, Driving circuit layer; 320, Opposing substrate; 321, Second substrate; 322, Color filter layer; 330, Liquid crystal layer. Detailed Implementation

[0042] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided to make this application more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art.

[0043] Furthermore, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a thorough understanding of embodiments of this application. However, those skilled in the art will recognize that the technical solutions of this application can be practiced without one or more of the specific details, or other methods, components, apparatuses, steps, etc., can be employed. In other instances, well-known methods, apparatuses, implementations, or operations are not shown or described in detail to avoid obscuring various aspects of this application.

[0044] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments. It should be noted that the technical features involved in the various embodiments described below can be combined with each other as long as they do not conflict with each other. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present application, and should not be construed as limiting the present application.

[0045] Example 1

[0046] See Figure 1 As shown, in this embodiment, the optical film 100 is used to convert at least a portion of the first color light into second color light. The optical film 100 includes a color conversion film layer 110, which includes a color conversion material capable of converting the first color light into second color light. The color conversion film layer 110 includes a central region 111 and side regions 112, with the side regions 112 located at least on opposite sides of the central region 111.

[0047] When the primary light is white and the secondary light is one of the three primary colors (red, green, and blue), the side region 112 contains color-converting material, and the density of the color-converting material gradually increases from the side closer to the center region 111 to the side farther away from the center region 111. The center region 111 does not contain color-converting material. For example, if the secondary light is blue, the center region 111 does not generate blue light conversion, but the side region 112 does generate blue light conversion. Furthermore, from the side closer to the center region 111 to the side farther away from the center region 111, the amount of blue light generated gradually increases due to the gradually increasing density of the color-converting material.

[0048] When the first color light is one of the three primary colors and the second color light is white light, the side region 112 has a color conversion material, and the density of the color conversion material gradually decreases from the side closer to the center region 111 to the side farther away from the center region 111. The center region 111 has a color conversion material and can convert all of the three primary colors of light into white light. For example, if the first color light is blue light, the color conversion material in the center region 111 will convert all the blue light passing through the center region 111 into white light, and no blue light will remain after passing through the center region 111. The side region 112 will have some blue light remaining, and the remaining blue light gradually increases from the side closer to the center region 111 to the side farther away from the center region 111 due to the gradually decreasing density of the color conversion material.

[0049] For large-size display panels, viewing the center area directly in front of the panel is a narrow viewing angle, resulting in good display quality and no color shift issues. However, viewing the side areas (112) is a wide viewing angle, which typically presents color shift problems, affecting the display quality. For example, in vertically aligned (VA) display panels, as the viewing angle increases, the transmittance of blue light decreases significantly before that of green and red light, resulting in a yellowish tint in the side areas (112). The greater the viewing angle, the more pronounced the yellowish tint becomes.

[0050] In this embodiment, the optical film 100 is used to convert at least a portion of the first color light into the second color light. The optical film 100 includes a color conversion film layer 110, which includes a color conversion material. The color conversion material can convert the first color light into the second color light. The color conversion film layer 110 includes a central region 111 and a side region 112. The side region 112 is located on at least two opposite sides of the central region 111. When the first color light is white light and the second color light is one of the three primary colors, the side region 112 has the color conversion material, and the density of the color conversion material gradually increases from the inside to the outside. When the first color light is one of the three primary colors and the second color light is white light, the side region 112 has the color conversion material, and the density of the color conversion material gradually decreases from the inside to the outside. The optical film 100 is used in a back module, display panel or display device. The optical film 100 can convert part of the light passing through the side area 112 of the backlight component into light with one of the three primary colors that gradually deepens, in order to compensate for the light whose transmittance decreases first as the viewing angle increases, thereby improving the color shift problem of the side area 112.

[0051] In some embodiments, the central region 111 includes a rectangular region, a rounded rectangular region, a circular region, or an elliptical region, etc., and the specific shape of the central region 111 can be set as appropriate. The side regions 112 are located at least on opposite sides of the central region 111, that is, the side regions 112 are located on opposite upper and lower sides, opposite left and right sides of the central region 111, or the side regions 112 are located on opposite upper and lower sides and left and right sides of the central region 111. The side regions 112 on any side of the central region 111 are narrowest in the middle and become wider towards both ends (i.e., the four corners of the corresponding display panel).

[0052] The viewing angle of the central area 111 is small, and no compensation is made for color shift in the central area 111 to avoid affecting the display effect; the viewing angle of the side area 112 is large, and color shift is compensated for in the side area 112, with more compensation for areas farther away from the central area 111, which can improve the color shift problem in the side area 112 and has little impact on the overall display image.

[0053] In some embodiments, the color conversion material includes a filter material, i.e., the color conversion film layer 110 is a filter film layer. For the side region 112, the density of the filter material gradually increases from the side closer to the center region 111 to the side farther from the center region 111. The filter material is a light-transmitting material of one of the three primary colors, i.e., a red light-transmitting material, a green light-transmitting material, or a blue light-transmitting material, and the color of the filter material in the side region 112 gradually deepens from the side closer to the center region 111 to the side farther from the center region 111.

[0054] Color conversion materials include light-filtering materials. When white light passes through the light-filtering material, two of the three primary colors of light are filtered out. One of the three primary colors generated is used to compensate for the light whose transmittance decreases first as the viewing angle increases, which can improve the problem of 112 color shift in the side area.

[0055] In some embodiments, the second color light is blue light.

[0056] Taking a vertically aligned display panel as an example, as the viewing angle increases, the transmittance of blue light decreases significantly before that of green and red light, resulting in a yellowish tint in the side area 112. The second color light is blue light. The light passing through the central area 111 is unaffected, while the portion of white light passing through the side area 112 is filtered into blue light. Furthermore, the amount of blue light generated gradually increases from the side closer to the central area 111 to the side farther away from it, compensating for the decrease in blue light transmittance as the viewing angle increases, thus improving the yellowish tint problem in the side area 112.

[0057] It should be understood that the optical film 100 may be a single film layer used only to achieve color conversion. The optical film 100 may be formed on other structures, but is not limited to them. The optical film 100 may also be made into a detachable independent film structure, depending on the specific circumstances.

[0058] Example 2

[0059] The difference between Embodiment 2 and Embodiment 1 is that in Embodiment 2, the optical film 100 further includes a functional layer 120. In Embodiment 1, the optical film 100 is a single film layer used to achieve color conversion, while in Embodiment 2, the optical film 100 is a composite film layer having a color conversion film layer 110 and a functional layer 120.

[0060] See Figure 2 As shown, the optical film 100 also includes a functional layer 120, which includes a diffusion film, a brightness enhancement film, or a polarizing film. A color conversion film 110 is disposed on one side of the functional layer 120. That is, the optical film 100 can be a diffusion film, a brightness enhancement film, or a polarizing film with a color conversion film 110. When the functional layer 120 is a diffusion film, a brightness enhancement film, or a polarizing film, the central region 111 can be a hollowed-out region or a non-hollowed-out region. When the central region 111 is a non-hollowed-out region, the central region 111 can be a transparent region or a white light-transmitting region.

[0061] It should be noted that the optical film 100 can be a diffusion film, a brightness enhancement film, or a polarizing film. The optical film 100 includes a functional layer 120 such as a diffusion film layer, a brightness enhancement film layer, or a polarizing film layer that realizes the functions of diffusion, brightness enhancement, or polarization. The color conversion film layer 110 is disposed on one side of the functional layer 120, but it is not limited to this. The color conversion film layer 110 can also be designed as a functional layer 120, that is, the functional layer 120 such as a diffusion film layer, a brightness enhancement film layer, or a polarizing film layer has a filter material. The color conversion film layer 110 and the functional layer 120 are combined into one layer, which can be determined according to the specific situation.

[0062] The optical film 100 is a diffusion film, brightness enhancement film, or polarizing film with a color conversion film layer 110. The optical film 100 is used in display devices, which can simplify the structure of the display device and reduce material management costs.

[0063] Example 3

[0064] The difference between Example 3 and Example 1 is that the color conversion materials are different.

[0065] See Figure 3 As shown, the color conversion material includes phosphor, and for the side region 112, the density of the phosphor gradually decreases from the side closer to the center region 111 to the side farther away from the center region 111.

[0066] In Embodiment 2, the optical film 100 can be used in the backlight module 200, which may include a light source substrate 210. The optical film 100 may be disposed on the light-emitting side of the light source substrate 210. The light source substrate 210 may include a light-emitting chip 212, which includes a light-emitting diode (LED).

[0067] The color conversion material includes phosphor, that is, the color conversion film layer 110 is a phosphor layer. The phosphor layer can convert some of the three primary colors of light emitted by the light source substrate 210 into white light. All of the three primary colors of light passing through the central region 111 are converted into white light, and some of the three primary colors of light passing through the side region 112 are converted into white light with some remaining. As the density of the phosphor gradually decreases, the remaining three primary colors of light gradually increase.

[0068] The viewing angle of the side area 112 is large. The side area 112 compensates for color shift, and the further away from the center area 111, the more compensation is given. This can improve the color shift problem of the side area 112 and has little impact on the overall display image.

[0069] It should be noted that since one of the three primary colors of light passing through the side region 112 is partially converted into white light and partially used to compensate for color shift, the utilization rate of light from the light source substrate 210 is not reduced. The side region 112 compensates for color shift and does not cause a brightness difference between the central region 111 and the side region 112. Even if there is a brightness difference between the central region 111 and the side region 112, the brightness of the light illuminating the side region 112 can be increased by adjusting the position and density of the light-emitting chips 212 corresponding to the central region 111 and the side region 112. Furthermore, the brightness gradually increases from the side closer to the central region 111 to the side farther away from the central region 111 to compensate for the brightness difference between the central region 111 and the side region 112.

[0070] In some embodiments, the first color light is blue light, and the phosphor includes yellow phosphor. That is, the light-emitting chip 212 of the light source substrate 210 is a blue light-emitting diode, and the light from the light source substrate 210 shines on the yellow phosphor. The yellow phosphor is excited by the blue light to generate yellow light and diffusely reflects the yellow light. The blue light that is not excited by the yellow phosphor undergoes diffuse reflection directly. The yellow light and the blue light mix to form white light.

[0071] The phosphor includes yellow phosphor, and the light-emitting chip 212 of the light source substrate 210 is a blue light-emitting diode. The color conversion film layer 110 converts blue light into white light. Blue light-emitting diodes are highly efficient, simple to manufacture, have good temperature stability, and good color rendering. Meanwhile, in vertically aligned liquid crystal display panels, as the viewing angle increases, the transmittance of blue light decreases significantly before that of green and red light, resulting in a yellowish tint in the side region 112. Since the primary color light is blue, all blue light passing through the central region 111 is converted into white light, and only a portion of the blue light passing through the side region 112 is converted into white light, with some remaining to compensate for color shift, thus effectively solving the yellowish tint problem in the side region 112.

[0072] It should be understood that when the optical film 100 is a single film layer used to achieve color conversion, the optical film 100 can be formed on the light source substrate 210, but is not limited thereto. The optical film 100 can also be made into a detachable independent film structure, depending on the specific circumstances.

[0073] Example 4

[0074] See Figure 4 As shown, in this embodiment, the backlight module 200 includes a backlight assembly and an optical film 100. The optical film 100 is disposed on the light-emitting side of the backlight assembly, and the optical film 100 may include the optical films 100 disclosed in Embodiments 1 to 3. The light source substrate 210 may include a driving backplate 211 and a light-emitting chip 212 disposed on one side of the driving backplate 211. The light-emitting chip 212 includes a light-emitting diode.

[0075] When the optical film 100 is the optical film 100 disclosed in Embodiments 1 and 2, the light source substrate 210 may include a white light-emitting diode or a red light-emitting diode, a green light-emitting diode, and a blue light-emitting diode, and the light source substrate 210 is a white light surface light source; the light source substrate 210 may also include one of a red light-emitting diode, a green light-emitting diode, and a blue light-emitting diode, that is, the light source substrate 210 is a monochromatic light surface light source, and the backlight assembly also includes a color conversion layer, which is formed on the light-emitting side of the light source substrate 210 and is used to convert all the monochromatic light of the light source substrate 210 into white light. The optical film 100 is disposed on the side of the color conversion layer away from the light source substrate 210.

[0076] When the optical film 100 is the optical film 100 disclosed in Embodiment 1 and Embodiment 2, taking blue light as an example, no blue light is generated in the central region 111 of the optical film 100, while blue light is generated in the side region 112. Furthermore, from the side closer to the central region 111 to the side farther away from the central region 111, the density of the color conversion material gradually increases, and the amount of blue light generated gradually increases.

[0077] When the optical film 100 is the optical film 100 disclosed in Embodiment 3, the backlight module 200 includes a backlight assembly and an optical film 100. The optical film 100 is disposed on the light-emitting side of the backlight assembly. The backlight assembly may include a light source substrate 210 and may not include a color conversion layer. The light-emitting chip 212 of the light source substrate 210 includes one of a red light-emitting diode, a green light-emitting diode, and a blue light-emitting diode.

[0078] When the optical film 100 is the optical film 100 disclosed in Example 3, taking blue light as the first color light as an example, all the blue light passing through the central region 111 is converted into white light, and some of the blue light passing through the side region 112 is converted into white light and some remains. As the density of the phosphor gradually decreases, the remaining blue light gradually increases.

[0079] The backlight module 200 includes an optical film 100, which can convert part of the light passing through the side region 112 of the light source substrate 210 into light with one of the three primary colors that gradually deepens, in order to compensate for the light whose transmittance decreases first as the viewing angle increases, thereby improving the color shift problem in the side region 112.

[0080] Example 5

[0081] See Figure 5As shown, the display panel 300 includes a panel assembly, which includes an array substrate 310 and an opposing substrate 320, and a liquid crystal layer 330 formed between the array substrate 310 and the opposing substrate 320. The array substrate 310 includes a first substrate 311 and a driving circuit layer 312 formed on one side of the first substrate 311. The opposing substrate 320 includes a second substrate 321 and a color filter layer 322 formed on one side of the second substrate 321. The color filter layer 322 includes red, green, and blue color resists. It should be understood that the color filter layer 322 can also be disposed on the array substrate 310, i.e., using COA (Color Filter On Array) technology, to reduce the difficulty of aligning the array substrate 310 and the opposing substrate 320, reduce the manufacturing cost of the display panel 300, and improve the pixel aperture ratio and transmittance.

[0082] The display panel 300 also includes the optical film 100 disclosed in Embodiment 1. The optical film 100 is disposed on the side of the color filter layer 322 near the first substrate 311, for example, on the side of the first substrate 311 away from the opposing substrate 320. Referring to Figure 6, the optical film 100 converts a portion of the light from the backlight module 200 passing through the side region 112 into light with one of the three primary colors that gradually deepens. For example, the optical film 100 converts a portion of the white light from the backlight module 200 passing through the side region 112 into blue light. The color filter layer 322 includes a red color filter, a green color filter, and a blue color filter. The blue light passing through the red and green color filters is absorbed and does not affect the display of the display panel 300. The blue light passing through the blue color filter has no effect. The blue light can compensate for the color shift caused by the increase of the viewing angle.

[0083] It should be noted that since only the side region 112 generates blue light, and the amount of blue light generated gradually increases from the side closer to the center region 111 to the side farther away from the center region 111, the optical film 100 does not cause a significant difference in brightness between the center region 111 and the side region 112. At the same time, when there is a difference in brightness between the center region 111 and the side region 112, the brightness of the light illuminating the side region 112 can be increased by adjusting the position and density of the light-emitting chips 212 corresponding to the center region 111 and the side region 112. Furthermore, the brightness gradually increases from the side closer to the center region 111 to the side farther away from the center region 111, thus compensating for the brightness difference between the center region 111 and the side region 112.

[0084] The optical film 100 is disposed on the side of the color filter layer 322 near the first substrate 311. The optical film 100 can convert part of the light passing through the side area 112 of the backlight module 200 into light with one of the three primary colors that gradually deepens. This is used to compensate for the light whose transmittance decreases first as the viewing angle increases. This can improve the color shift problem of the side area 112 without affecting the display panel 300.

[0085] Example 6

[0086] See Figure 7 As shown, in this embodiment, the display device may include a backlight assembly, a panel assembly, and the optical film 100 disclosed in Embodiments 1 to 3. The panel assembly is disposed on the light-emitting side of the backlight assembly, and the optical film 100 is disposed on the light-emitting side of the light-emitting chip 212 of the backlight assembly, on the side of the color filter layer 322 of the panel assembly near the backlight assembly, or between the backlight assembly and the panel assembly. Specifically, if the optical film 100 is disposed on the light-emitting side of the light-emitting chip 212 of the backlight assembly, the display device includes the backlight module 200 and the panel assembly disclosed in Embodiment 4; if the optical film 100 is disposed on the side of the color filter layer 322 of the panel assembly near the backlight assembly, the display device includes the display panel 300 and the backlight assembly disclosed in Embodiment 5; or if the optical film 100 is disposed between the backlight assembly and the panel assembly, the optical film 100 is the optical film 100 disclosed in Embodiment 2. In other words, the display device only needs to have one side of the optical film 100, and the optical film 100 can be disposed between the color filter layer 322 and the light-emitting chip 212.

[0087] The display device includes an optical film 100, which includes a color conversion film layer 110. The color conversion film layer 110 includes a color conversion material that can convert a first color light into a second color light. The color conversion film layer 110 includes a central region 111 and a side region 112. The side region 112 is located at least on opposite sides of the central region 111. When the first color light is white light and the second color light is one of the three primary colors, the side region 112 has the color conversion material, and the density of the color conversion material gradually increases from the inside to the outside. When the first color light is one of the three primary colors and the second color light is white light, the side region 112 has the color conversion material, and the density of the color conversion material gradually decreases from the inside to the outside. The optical film 100 is used in the back module, display panel 300 or display device. The optical film 100 can convert part of the light passing through the side area 112 of the backlight component into light with one of the three primary colors that gradually deepens, in order to compensate for the light whose transmittance decreases first as the viewing angle increases, thereby improving the color shift problem of the side area 112.

[0088] The terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0089] In this application, unless otherwise expressly specified and limited, the terms "assembly," "connection," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0090] In the description of this specification, references to terms such as "some embodiments," "exemplarily," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. The illustrative expressions of the above terms in this specification do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0091] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application. Therefore, any changes or modifications made in accordance with the claims and description of this application should fall within the scope of this patent application.

Claims

1. A display device comprising a backlight assembly, a panel assembly, and an optical film, wherein the panel assembly is disposed on the light-emitting side of the backlight assembly, the backlight assembly includes a plurality of light-emitting chips, the panel assembly includes a color filter layer, and the optical film is disposed between the plurality of light-emitting chips and the color filter layer, the optical film being used to convert at least a portion of the first color light from the light-emitting chips into second color light, the optical film including a color conversion film layer, the color conversion film layer including a color conversion material, the color conversion material being capable of converting the first color light into the second color light, characterized in that... The color conversion film layer includes a central region and a side region defined relative to the display area of ​​the panel assembly, the side regions being located on at least two opposite sides of the central region; Wherein, the first color light is one of the three primary colors, the second color light is white light, the side region has the color conversion material, and the density of the color conversion material gradually decreases from the side closer to the center region to the side farther away from the center region, the center region has the color conversion material and the center region can convert all of the three primary colors into white light, the side region can convert part of the three primary colors into white light and allow part of the three primary colors to pass through, and a mixed light of white light and the three primary colors is formed on the side region away from the backlight assembly, the three primary colors being the light whose transmittance decreases first as the viewing angle increases.

2. The display device according to claim 1, characterized in that, The central region includes a rectangular region, a rounded rectangular region, a circular region, or an elliptical region.

3. The display device according to claim 1, characterized in that, The optical film further includes a functional layer, which includes a diffusion film, a brightness enhancement film, or a polarizing film. The color conversion film is disposed on one side of the functional layer or the color conversion film is the functional layer.

4. The display device according to claim 1, characterized in that, The color conversion material includes phosphors, and the density of the phosphors gradually decreases from the side closer to the central region to the side farther away from the central region.

5. The display device according to claim 4, characterized in that, The first color light is blue light, and the phosphor includes yellow phosphor.

6. The display device according to claim 1, characterized in that, The optical film is disposed between the backlight assembly and the panel assembly.

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