Optical film, backlight module, display panel and display device

Abstract

The invention 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 at least used for converting part of first-color light into second-color light, the optical film comprises a color conversion film layer, the color conversion film layer comprises a center area and side edge areas, and the side edge areas are located on at least two opposite sides of the center area; when the first-color light is white light and the second-color light is one of three primary colors, the side area is provided with a color conversion material, the density of the color conversion material is gradually increased from inside to outside, and when the first-color light is one of the three primary colors and the second-color light is white light, the side area is provided with the color conversion material; and the density of the color conversion material is gradually reduced from inside to outside. The optical film can convert part of light rays, penetrating through the side edge area, of the backlight assembly into light rays with one of three primary colors which are gradually deepened, the light rays are used for compensating the light rays with the transmittance first attenuating along with increasing of the visual angle, and the problem of color cast of the side edge area can be solved.

Description

Technical Field

[0001] The present application belongs to the field of display, and specifically relates to an optical film, a backlight module, a display panel and a display device. Background Art

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

[0003] For large-size display panels, when viewing the middle area of ​​the display panel from the front of the display panel, the viewing angle is small, the display effect is good, and there is no color shift problem; when viewing the side area of ​​the display panel, the viewing angle is large, and there is usually a color shift problem in the side area, which affects the display effect. For example, for vertical alignment (VA) display panels, as the viewing angle increases, the transmittance of blue light is significantly attenuated before the transmittance of green light and red light, that is, the side area is yellowish. Summary of the invention

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

[0005] In order to achieve the above-mentioned object, the present application provides an optical film, which is used to convert at least part of a first color light into a second color light, wherein the optical film comprises a color conversion film layer, wherein the color conversion film layer comprises a color conversion material, wherein the color conversion material can convert the first color light into the second color light, and wherein the color conversion film layer comprises:

[0006] Central area;

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

[0008] Among them, when the first color light is white light and the second color light is one of the three primary colors, the side area has the color conversion material, and the density of the color conversion material gradually increases from the side close to the central area to the side away from the central area. When the first color light is one of the three primary colors and the second color light is white light, the side area has the color conversion material, and the density of the color conversion material gradually decreases from the side close to the central area to the side away from the central area. The central area has the color conversion material and the central area can convert all the light of one of the three primary colors into white light.

[0009] Optionally, the central area includes a rectangular area, a rounded rectangular area, a circular area or an elliptical area.

[0010] Optionally, the color conversion material includes a filter material, and the density of the filter material gradually increases from a side close to the central area to a side far from the central area, and the color of the filter material in the side area gradually deepens.

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

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

[0013] Optionally, the color conversion material includes fluorescent powder, and the density of the fluorescent powder gradually decreases from a side close to the central area to a side far from the central area.

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

[0015] The present application also provides a backlight module, comprising:

[0016] light source substrate;

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

[0018] The present application also provides a display panel, comprising:

[0019] An array substrate comprises a first base substrate;

[0020] an opposing substrate, arranged in a box with the array substrate, the opposing substrate comprising a second base substrate, the opposing substrate comprising a color filter layer, the color filter layer being formed on a side of the second base substrate close to the array substrate, or the array substrate comprising the color filter layer, the color filter layer being formed on a side of the first base substrate close to the opposing substrate;

[0021] The optical film is arranged on a side of the color filter layer close to the first substrate.

[0022] The present application also provides a display device, comprising:

[0023] Backlight assembly;

[0024] A panel assembly, arranged on the light-emitting side of the backlight assembly;

[0025] The optical film is arranged 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 close to 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 the present application have the following beneficial effects:

[0027] In the present application, the optical film is used to convert at least part of the first color light into the second color light. The optical film includes a color conversion film layer. The color conversion film layer 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 includes a central area and a side area. The side area is located at least on two opposite sides of the central area. When the first color light is white light and the second color light is one of the three primary colors, the side area 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 area has 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, a display panel or a display device. The optical film can convert part of the light of the backlight component passing through the side area into light with one of the three primary colors that gradually deepens. It is used to compensate for the light whose transmittance first decays as the viewing angle increases, and can improve the problem of color deviation in the side area.

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

[0029] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present application, and together with the specification are used to explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 It is a schematic diagram of the structure of the optical film in Example 1 of the present application.

[0032] Figure 2 It is a schematic diagram of the structure of the optical film in Example 2 of the present application.

[0033] Figure 3 It is a schematic diagram of the structure of the optical film in Example 3 of the present application.

[0034] Figure 4It is a structural schematic diagram of the backlight module in the fourth embodiment of the present application.

[0035] Figure 5 It is a schematic diagram of the structure of the display panel in the fifth embodiment of the present application.

[0036] Figure 6 This is a schematic diagram of improving color deviation of the optical film in Example 5 of the present application.

[0037] Figure 7 It is a structural schematic diagram of the display device in Example 6 of the present application.

[0038] Description of reference numerals:

[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, driving backplane; 212, light emitting chip;

[0041] 300, display panel; 310, array substrate; 311, first base substrate; 312, driving circuit layer; 320, opposing substrate; 321, second base substrate; 322, color filter layer; 330, liquid crystal layer. DETAILED DESCRIPTION

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

[0043] In addition, described feature, structure or characteristic can be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present application. However, those skilled in the art will appreciate that the technical scheme of the present application can be put into practice without one or more of the specific details, or other methods, components, devices, steps, etc. can be adopted. In other cases, known methods, devices, realizations or operations are not shown or described in detail to avoid blurring the various aspects of the application.

[0044] The present application is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the technical features involved in the various embodiments of the present application 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 are intended to be used to explain the present application, and should not be understood as limiting the present application.

[0045] Embodiment 1

[0046] See also Figure 1 As shown, in this embodiment, the optical film 100 is used to convert at least part of the first color light into the second color light. The optical film 100 includes a color conversion film layer 110, and the color conversion film layer 110 includes a color conversion material, and the color conversion material can convert the first color light into the second color light. The color conversion film layer 110 includes a central area 111 and a side area 112, and the side area 112 is located on at least two opposite sides of the central area 111.

[0047] When the first color light is white light and the second color light is one of the three primary colors (red, green and blue), the side region 112 has a color conversion material, and the density of the color conversion material gradually increases from the side close to the central region 111 to the side far from the central region 111, and the central region 111 does not have a color conversion material. For example, when the second color light is blue light, no blue light is converted and generated in the central region 111, and blue light is converted and generated in the side region 112, and from the side close to the central region 111 to the side far from the central region 111, the density of the color conversion material gradually increases, and the converted blue light gradually increases.

[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 close to the center region 111 to the side far from the center region 111. The center region 111 has a color conversion material and the center region 111 can convert all the one of the three primary colors into white light. For example, the first color light is a blue light, and the color conversion material in the center region 111 converts all the blue light passing through the center region 111 into white light. After passing through the center region 111, no blue light remains. There is blue light remaining in the side region 112, and from the side close to the center region 111 to the side far from the center region 111, the remaining blue light gradually increases due to the gradual decrease in the density of the color conversion material.

[0049] For a large-size display panel, when viewing the middle area of ​​the display panel from the front of the display panel, the viewing angle is small, the display effect is good, and there is no color shift problem; when viewing the side area 112 of the display panel, the viewing angle is large, and there is usually a color shift problem in the side area 112, which affects the display effect. For example, for a vertical alignment (VA) display panel, as the viewing angle increases, the transmittance of blue light is significantly attenuated before the transmittance of green light and red light, that is, the side area 112 is yellowish, and the larger the viewing angle, the more obvious the yellowishness.

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

[0051] In some embodiments, the central area 111 includes a rectangular area, a rounded rectangular area, a circular area, or an elliptical area, etc. The specific shape of the central area 111 can be set as needed. The side area 112 is at least located on two opposite sides of the central area 111, that is, the side area 112 is located on the upper and lower sides, the left and right sides, or the side area 112 is located on the upper and lower sides and the left and right sides of the central area 111. The side area 112 on any side of the central area 111 has the narrowest width in the middle, and the width increases as it extends toward the two ends (i.e., the four corners of the display panel).

[0052] The viewing angle of the central area 111 is small, and the central area 111 does not compensate for color deviation to avoid affecting the display effect; the viewing angle of the side area 112 is large, and the side area 112 compensates for color deviation, and the area farther from the central area 111 is compensated more, which can improve the color deviation problem of 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, that is, 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 close to the central region 111 to the side away from the central region 111. The filter material is a light-transmitting material of one of the three primary colors, that is, a red light-transmitting material, a green light-transmitting material, or a blue light-transmitting material. From the side close to the central region 111 to the side away from the central region 111, the color of the filter material in the side region 112 gradually deepens.

[0054] The color conversion material includes a filter material. After the white light passes through the filter material, two colors of the three primary colors are filtered out, and the light of one of the three primary colors generated by the conversion is used to compensate for the light whose transmittance decays first as the viewing angle increases, which can improve the color deviation problem of the side area 112.

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

[0056] Taking the vertical alignment display panel as an example, as the viewing angle increases, the transmittance of blue light is significantly attenuated before the transmittance of green light and red light, that is, the side area 112 is yellowish. The second color light is blue light, and the light passing through the central area 111 is not affected. The white light passing through the side area 112 is partially filtered into blue light, and the converted blue light gradually increases from the side close to the central area 111 to the side far from the central area 111 to compensate for the attenuation of the transmittance of blue light as the viewing angle increases, which can improve the problem of yellowish side area 112.

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

[0058] Embodiment 2

[0059] The difference between the second embodiment and the first embodiment is that the optical film 100 in the second embodiment further includes a functional layer 120. The optical film 100 in the first embodiment is a single film layer for realizing color conversion, while the optical film 100 in the second embodiment is a composite film layer having a color conversion film layer 110 and a functional layer 120.

[0060] See also Figure 2 As shown, the optical film 100 further includes a functional layer 120, and the functional layer 120 includes a diffusion film layer, a brightness enhancement film layer or a polarizing film layer, and the color conversion film layer 110 is arranged 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 having a color conversion film layer 110. When the functional layer 120 is a diffusion film layer, a brightness enhancement film layer or a polarizing film layer, the central area 111 can be a hollow area or a non-hollow area, and when the central area 111 is a non-hollow area, the central area 111 can be a transparent area or a white light-transmitting area.

[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 for realizing diffusion, increment or polarization functions. The color conversion film layer 110 is arranged on one side of the functional layer 120, but 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 the diffusion film layer, the brightness enhancement film layer or the polarizing film layer has a filter material, and 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, a brightness enhancement film or a polarizing film having a color conversion film layer 110 . The optical film 100 is used in a display device, which can simplify the structure of the display device and reduce material management costs.

[0063] Embodiment 3

[0064] The difference between the third embodiment and the first embodiment is that the color conversion materials are different.

[0065] See also Figure 3 As shown, the color conversion material includes phosphors, and for the side region 112 , the density of the phosphors gradually decreases from the side close to the central region 111 to the side far from the central region 111 .

[0066] The optical film 100 in the second embodiment can be used in a backlight module 200, which can include a light source substrate 210, and the optical film 100 can be disposed on the light emitting side of the light source substrate 210. The light source substrate 210 can include a light emitting chip 212, and the light emitting chip 212 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, which can convert part 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 area 111 are converted into white light, and part of the three primary colors of light passing through the side area 112 is converted into white light and part remains. 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 is compensated for color shift, and the area farther from the central area 111 is compensated more, which 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 part of the light of one of the three primary colors passing through the side area 112 is converted into white light and part of it is used to compensate for the color deviation, the utilization rate of the light of the light source substrate 210 is not reduced. The side area 112 compensates for the color deviation and does not cause a brightness difference between the central area 111 and the side area 112. Even if there is a brightness difference between the central area 111 and the side area 112, the brightness of the light irradiating the side area 112 can be increased by adjusting the position and density of the light emitting chips 212 corresponding to the central area 111 and the side area 112. The brightness gradually increases from the side close to the central area 111 to the side away from the central area 111 to compensate for the brightness difference between the central area 111 and the side area 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 irradiates the yellow phosphor, which is excited by the blue light to generate yellow light and diffusely reflects the yellow light, and the blue light that is not excited by the yellow phosphor is directly diffusely reflected, and the yellow light and the blue light are mixed to form white light.

[0071] The phosphor includes yellow phosphor, the light emitting chip 212 of the light source substrate 210 is a blue light emitting diode, and the color conversion film layer 110 converts the blue light into white light. The blue light emitting diode has high efficiency, simple preparation, good temperature stability, and good color rendering. At the same time, in liquid crystal display panels such as vertical alignment display panels, as the viewing angle increases, the transmittance of blue light is significantly attenuated before the transmittance of green light and red light, that is, the side area 112 is yellowish. The first color light is blue light, and the blue light passing through the central area 111 is completely converted into white light. The blue light passing through the side area 112 is partially converted into white light and the remaining part is used to compensate for the color cast, which just solves the problem of yellowish side area 112.

[0072] It should be understood that when the optical film 100 is a single film layer for realizing 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 situation.

[0073] Embodiment 4

[0074] See also 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 arranged on the light-emitting side of the backlight assembly, and the optical film 100 may include the optical film 100 disclosed in Embodiments 1 to 3. The light source substrate 210 may include a driving backplane 211 and a light-emitting chip 212 arranged on one side of the driving backplane 211, and the light-emitting chip 212 includes a light-emitting diode.

[0075] When the optical film 100 is the optical film 100 disclosed in the first and second embodiments, the light source substrate 210 may include a white light emitting diode or the light source substrate 210 includes 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 further 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 arranged 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 Example 1 and Example 2, taking the second color light as blue light as an example, no blue light is generated in the central area 111 of the optical film 100, blue light is generated in the side area 112, and from the side close to the central area 111 to the side far from the central area 111, the density of the color conversion material gradually increases, and the converted blue light gradually increases.

[0077] When the optical film 100 is the optical film 100 disclosed in Example 3, the backlight module 200 includes a backlight assembly and an optical film 100, the optical film 100 is arranged 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, and 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 the first color light as blue light as an example, the blue light passing through the central area 111 is completely converted into white light, and the blue light passing through the side area 112 is partially converted into white light and part of it 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 from the light source substrate 210 that passes through the side area 112 into light with one of the three primary colors that gradually deepens, so as to compensate for the light whose transmittance first decays as the viewing angle increases, thereby improving the color cast problem in the side area 112.

[0080] Embodiment 5

[0081] See also Figure 5As shown, the display panel 300 includes a panel assembly, and the panel assembly 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 base substrate 311 and a driving circuit layer 312 formed on one side of the first base substrate 311, and the opposing substrate 320 includes a second base substrate 321 and a color filter layer 322 formed on one side of the second base substrate 321, and the color filter layer 322 includes red color resistance, green color resistance and blue color resistance. It should be understood that the color filter layer 322 can also be provided on the array substrate 310, that is, the COA (Color Filter On Array) technology is adopted 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 further includes the optical film 100 disclosed in the first embodiment, and the optical film 100 is disposed on the side of the color filter layer 322 close to the first base substrate 311, for example, the optical film 100 is disposed on the side of the first base substrate 311 away from the opposite substrate 320. Referring to FIG6, the optical film 100 converts part of the light of the backlight module 200 passing through the side area 112 into light having one of the three primary colors that gradually deepens, for example, the optical film 100 converts part of the white light of the backlight module 200 passing through the side area 112 into blue light, and the color filter layer 322 includes red color resistance, green color resistance and blue color resistance, and the blue light passing through the red color resistance and the green color resistance will be absorbed and will not affect the display of the display panel 300, and the blue light passing through the blue color resistance will have no effect, and the blue light can compensate for the color deviation caused by the increase of the viewing angle.

[0083] It should be noted that, since only the side area 112 generates blue light, and the converted blue light gradually increases from the side close to the center area 111 to the side far from the center area 111, the optical film 100 will not cause a significant difference in brightness between the center area 111 and the side area 112. At the same time, when there is a difference in brightness between the center area 111 and the side area 112, the brightness of the light irradiating the side area 112 can be increased by adjusting the position and density of the light emitting chips 212 corresponding to the center area 111 and the side area 112, and the brightness gradually increases from the side close to the center area 111 to the side far from the center area 111, so as to compensate for the brightness difference between the center area 111 and the side area 112.

[0084] The optical film 100 is arranged on the side of the color filter layer 322 close to the first base substrate 311. The optical film 100 can convert part of the light from the backlight module 200 that passes through the side area 112 into light with one of the three primary colors that gradually deepens, so as to compensate for the light whose transmittance first decays as the viewing angle increases. This can improve the color cast problem in the side area 112 without affecting the display of the display panel 300.

[0085] Embodiment 6

[0086] See also 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 arranged on the light-emitting side of the backlight assembly, and the optical film 100 is arranged 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 close to the backlight assembly, or between the backlight assembly and the panel assembly. Among them, the optical film 100 is arranged on the light-emitting side of the light-emitting chip 212 of the backlight assembly, that is, the display device includes the backlight module 200 and the panel assembly disclosed in embodiment 4; the optical film 100 is arranged on the side of the color filter layer 322 of the panel assembly close to the backlight assembly, that is, the display device includes the display panel 300 and the backlight assembly disclosed in embodiment 5; the optical film 100 is arranged between the backlight assembly and the panel assembly, that is, the optical film 100 is the optical film 100 disclosed in embodiment 2. In other words, the display device only needs to be provided with one side of the optical film 100, and the optical film 100 can be arranged 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, and the color conversion material can convert a first color light into a second color light. The color conversion film layer 110 includes a central area 111 and a side area 112. The side area 112 is located on at least two opposite sides of the central area 111. When the first color light is a white light and the second color light is one of the three primary colors, the side area 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 a white light, the side area 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, a display panel 300 or a display device. The optical film 100 can convert part of the light from the backlight assembly passing through the side area 112 into light with one of the three primary colors that gradually deepens, and is used to compensate for the light whose transmittance first decays as the viewing angle increases, thereby improving the color cast problem in the side area 112.

[0088] The terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of the feature. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0089] In this application, unless otherwise clearly specified and limited, the terms "assembly", "connection" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0090] In the description of this specification, the description with reference to the terms "some embodiments", "exemplarily", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0091] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application. Therefore, any changes or modifications made in accordance with the claims and description of the present application should fall within the scope of the patent of this application.

Claims

1. An optical film, at least for converting a portion of a first color light into a second color light, the optical film comprising a color conversion film layer, the color conversion film layer comprising a color conversion material, the color conversion material being able to convert the first color light into the second color light, characterized in that: The color conversion film layer comprises: Central area; Side regions, located on at least two opposite sides of the central region; Among them, when the first color light is white light and the second color light is one of the three primary colors, the side area has the color conversion material, and the density of the color conversion material gradually increases from the side close to the central area to the side away from the central area. When the first color light is one of the three primary colors and the second color light is white light, the side area has the color conversion material, and the density of the color conversion material gradually decreases from the side close to the central area to the side away from the central area. The central area has the color conversion material and the central area can convert all the light of one of the three primary colors into white light.

2. The optical film according to claim 1, characterized in that: The central area includes a rectangular area, a rounded rectangular area, a circular area or an elliptical area.

3. The optical film according to claim 1, characterized in that: The color conversion material includes a filter material. The density of the filter material gradually increases from a side close to the central area to a side far from the central area, and the color of the filter material in the side area gradually deepens.

4. The optical film according to claim 3, characterized in that: The second color light is blue light.

5. The optical film according to claim 3, characterized in that: The optical film further comprises a functional layer, which comprises a diffusion film layer, a brightness enhancement film layer or a polarizing film layer. The color conversion film layer is arranged on one side of the functional layer or the color conversion film layer is the functional layer.

6. The optical film according to claim 1, characterized in that: The color conversion material includes fluorescent powder, and the density of the fluorescent powder gradually decreases from a side close to the central area to a side far from the central area.

7. The optical film according to claim 6, characterized in that: The first color light is blue light, and the phosphor includes yellow phosphor.

8. A backlight module, characterized in that: include: light source substrate; The optical film according to any one of claims 1 to 7, wherein the optical film is arranged on the light emitting side of the light source substrate.

9. A display panel, characterized in that: include: An array substrate comprises a first base substrate; an opposing substrate, arranged in a box with the array substrate, the opposing substrate comprising a second base substrate, the opposing substrate comprising a color filter layer, the color filter layer being formed on a side of the second base substrate close to the array substrate, or the array substrate comprising the color filter layer, the color filter layer being formed on a side of the first base substrate close to the opposing substrate; The optical film according to any one of claims 1 to 4, wherein the optical film is arranged on a side of the color filter layer close to the first base substrate.

10. A display device, characterized in that: include: Backlight assembly; A panel assembly, arranged on the light-emitting side of the backlight assembly; The optical film according to any one of claims 1 to 7, wherein the optical film is arranged 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 close to the backlight assembly, or between the backlight assembly and the panel assembly.

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