Backlight structure and display screen

Abstract

The present invention belongs to the field of display technology equipment, and in particular, to a backlight structure and a display screen. The backlight structure includes: a back frame with a receiving cavity, a middle frame arranged outside the back frame, a backlight assembly located in the receiving cavity, and a photosensitive color-changing layer made of a photosensitive material, the receiving cavity has an opening, the edge of the middle frame extends toward the opening with a support portion, and the photosensitive color-changing layer is located in the support portion; the photosensitive color-changing layer is used to sense the brightness of the light of the backlight assembly; when the brightness of the backlight assembly increases to a first predetermined value, the color brightness of the photosensitive color-changing layer decreases, and the photosensitive color-changing layer reduces the reflection of light; when the brightness of the backlight assembly decreases to a second predetermined value, the color brightness of the photosensitive color-changing layer increases, and the photosensitive color-changing layer enhances the reflection of light, and the first predetermined value is greater than the second predetermined value. The present invention can improve the display effect of the display screen through the photosensitive color-changing layer.

Description

Technical Field

[0001] The invention belongs to the field of display technology equipment, and in particular relates to a backlight structure and a display screen. Background Art

[0002] At present, with the development of LCD display module technology, HDR (High Dynamic Range Imaging) series products are becoming more and more popular in the market, gradually developing from HDR400 to HDR600 / 800 / 1000 / 1400+, etc. At the same time, with the higher requirements of HDR, the product brightness is also higher, and the temperature rise in the working state will also increase.

[0003] However, for narrow-border and borderless displays, changes in the brightness of the display product will cause light leakage around the LCM (Liquid Crystal Model) and produce problems such as bright lines and dark lines, affecting the display effect of the display and reducing the competitiveness of the display. In addition, the increase in the temperature rise of the display not only affects the performance of the display liquid crystal and the service life of the components, but also affects the end-customer experience, which is not conducive to the competitiveness of the display. Summary of the invention

[0004] The purpose of the embodiments of the present application is to provide a backlight structure, aiming to solve the problem of how to improve the display effect of the display panel.

[0005] To achieve the above purpose, the technical solution adopted in this application is:

[0006] In a first aspect, a backlight structure is provided, which includes: a back frame having a accommodating cavity, a middle frame arranged around the outside of the back frame, a backlight assembly located in the accommodating cavity, and a photosensitive color-changing layer made of a photovariable material, wherein the accommodating cavity has an opening, and a supporting portion extends from the edge of the middle frame toward the opening, and the photosensitive color-changing layer is located at the supporting portion; the photosensitive color-changing layer is used to sense the brightness of the light of the backlight assembly; when the brightness of the backlight assembly increases to a first predetermined value, the color brightness of the photosensitive color-changing layer decreases, and the photosensitive color-changing layer reduces reflection of the light; when the brightness of the backlight assembly decreases to a second predetermined value, the color brightness of the photosensitive color-changing layer increases, and the photosensitive color-changing layer increases reflection of the light, and the first predetermined value is greater than the second predetermined value.

[0007] In some embodiments, the support portion is arranged along the circumference of the accommodating cavity and is arranged in an annular structure, and the photosensitive color-changing layer is arranged along the circumference of the accommodating cavity and is also arranged in an annular structure.

[0008] In some embodiments, the backlight structure also includes a thermochromic layer made of a temperature-changing material and located at the supporting portion; the thermochromic layer is used to sense the temperature of the backlight assembly, and when the temperature of the backlight assembly rises to a third predetermined value, the color brightness of the thermochromic layer decreases, and the thermochromic layer reduces reflection of the light; when the temperature of the backlight assembly decreases to a fourth predetermined value, the color brightness of the thermochromic layer increases, and the thermochromic layer increases reflection of the light, and the third predetermined value is greater than the fourth predetermined value.

[0009] In some embodiments, the temperature-sensitive color-changing layer and the photosensitive color-changing layer are located on the same surface of the support portion and are arranged at intervals; or, the temperature-sensitive color-changing layer and the photosensitive color-changing layer are located on different surfaces of the support portion.

[0010] In some embodiments, the supporting portion has a first surface facing the bottom of the accommodating cavity, a second surface arranged opposite to the first surface, and a third surface located between the first surface and the second surface, and at least one of the first surface, the second surface and the third surface is provided with the photosensitive color-changing layer and / or the temperature-sensitive color-changing layer.

[0011] In some embodiments, the support portion is made of plastic material, the light-variable material and / or the temperature-variable material are mixed with the plastic material in a predetermined ratio, and the photochromic layer and / or the temperature-sensitive color-variable layer are integrally injection molded with the support portion.

[0012] In some embodiments, the photosensitive color-changing layer and / or the temperature-sensitive color-changing layer is also provided at a position of the cavity wall of the accommodating cavity adjacent to the opening.

[0013] In some embodiments, the backlight assembly includes a light guide plate and an optical film layer disposed on the light guide plate, and the edge of the light guide plate adjacent to the cavity wall of the accommodating cavity is also provided with the photosensitive color-changing layer and / or the temperature-sensitive color-changing layer.

[0014] In some embodiments, the outer surface of the middle frame is provided with the temperature-sensitive color-changing layer arranged in a predetermined shape.

[0015] In a second aspect, a display screen is provided, which includes the backlight structure. The display screen also includes a display panel. The display panel is located at the opening, and an edge of the display panel is supported by the support portion.

[0016] The beneficial effects of the present application are as follows: the backlight structure includes a middle frame, a back frame and a backlight assembly, the back frame has a accommodating cavity for the backlight assembly to be set, the middle frame is arranged around the outer periphery of the back frame and is provided with a supporting portion, the supporting portion extends toward the opening, and a photosensitive color-changing layer is provided on the supporting portion. The photosensitive color-changing layer can sense the brightness of the light of the backlight module and change its own color according to the brightness, thereby changing its own reflectivity to the light, avoiding the formation of bright lines or dark lines at the supporting portion, and improving the display effect of the display screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or exemplary technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a partial cross-sectional view of a backlight structure provided in an embodiment of the present application and provided with a photosensitive color-changing layer;

[0019] Figure 2 It is a partial cross-sectional view of a backlight structure provided in another embodiment of the present application and provided with a temperature-sensitive color-changing layer;

[0020] Figure 3 It is a partial cross-sectional view of a backlight structure provided by another embodiment of the present application, in which a light-variable material and a plastic material are mixed and molded;

[0021] Figure 4 It is a partial cross-sectional view of a backlight structure provided by yet another embodiment of the present application, in which a temperature-variable material and a plastic material are mixed and molded;

[0022] Figure 5 It is a partial cross-sectional view of a backlight structure provided by another embodiment of the present application, in which a temperature-variable material and a plastic material are mixed and molded and a photosensitive color-variable layer is provided;

[0023] Figure 6 It is a partial cross-sectional view of a backlight structure provided by another embodiment of the present application, in which a light-variable material and a plastic material are mixed and molded and a temperature-sensitive color-variable layer is provided;

[0024] Figure 7 It is a schematic diagram of the three-dimensional structure of a display screen provided in yet another embodiment of the present application.

[0025] Among them, the reference numerals in the figure are:

[0026] 100, backlight structure; 200, display panel; 300, display screen; 101, middle frame; 102, back frame; 103, accommodating cavity; 104, supporting portion; 1041, first surface; 1042, second surface; 1043, third surface; 110, photosensitive color-changing layer; 105, light guide plate; 130, backlight assembly; 106, lower diffusion film; 107, lower prism; 108, upper prism; 109, upper diffusion film; 120, temperature-sensitive color-changing layer; DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present application.

[0028] It should be noted that when a component is referred to as being "fixed on" or "disposed on" another component, it may be directly on the other component or indirectly on the other component. When a component is referred to as being "connected to" another component, it may be directly or indirectly connected to the other component. The orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances. The terms "first" and "second" are only used for the purpose of convenience of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. The meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0029] See also Figures 1 to 3, the embodiment of the present application provides a backlight structure 100 and a display screen 300 having the same. The backlight structure 100 includes: a back frame 102 having a receiving cavity 103, a middle frame 101 arranged around the outside of the back frame 102, a backlight assembly 130 located in the receiving cavity 103, and a photochromic layer 110 made of a photochromic material. It can be understood that the middle frame 101 is an annular structure and surrounds the back frame 102. The receiving cavity 103 has an opening, and the backlight assembly 130 is assembled in the receiving cavity 103 through the opening. A support portion 104 extends from the edge of the middle frame 101 toward the opening, and the support portion 104 is used to support and connect other structural members, such as a display panel 200. The display panel 200 is located at the opening, and the backlight assembly 130 projects light toward the display panel 200. The photosensitive color-changing layer 110 is located on the support portion 104, so that the photosensitive color-changing layer 110 is adjacent to the display panel 200 located on the support portion 104. The photosensitive color-changing layer 110 is used to sense the brightness of the light of the backlight assembly 130; the color of the sensing layer is related to the brightness of the light irradiated thereon by the backlight assembly 130. When the brightness of the backlight assembly 130 is increased to a certain extent, the color of the sensing layer is transformed from a light color system to a dark color system, or from a light color to a dark color, such as from white to gray, or even to black; when the brightness of the backlight assembly 130 is reduced to a certain extent, the color of the photosensitive color-changing layer 110 is transformed from a dark color system to a light color system, or from a dark color to a light color, such as from black to gray, or even from gray to white again.

[0030] See also Figures 1 to 3 In this embodiment, the brightness of the backlight assembly 130 is increased to a first predetermined value, the color brightness of the photosensitive color-changing layer 110 is reduced, the color of the photosensitive color-changing layer 110 is changed from a light color to a dark color, the reflection of light by the photosensitive color-changing layer 110 is reduced, the brightness of the edge of the supporting portion 104 is weakened, and the appearance of bright lines is avoided, thereby improving the display effect of the display panel 200; the brightness of the backlight assembly 130 is reduced to a second predetermined value, the first predetermined value is greater than the second predetermined value, the color brightness of the photosensitive color-changing layer 110 is increased, the color of the photosensitive color-changing layer 110 is changed from a dark color to a light color, the reflection of light by the photosensitive color-changing layer 110 is increased, the brightness of the edge of the supporting portion 104 is enhanced, and the appearance of dark lines is avoided, thereby improving the display effect of the display panel 200.

[0031] Optionally, the brightness range of the light source of the backlight assembly 130 is 4000-15000 nit. In this embodiment, the maximum brightness of the backlight assembly 130 is set to 10000 nit, the brightness variation range of the backlight assembly 130 is 8000-10000 nit, the range of the first predetermined value can be set to 9500-10000 nit, and the range of the second predetermined value can be set to 8000-9000 nit. When the brightness of the backlight assembly 130 is between 9000-9500 nit, the color of the photosensitive color-changing layer 110 does not change.

[0032] See also Figures 1 to 3 The backlight structure 100 provided in this embodiment includes a middle frame 101, a back frame 102 and a backlight assembly 130. The back frame 102 has a receiving cavity 103 for the backlight assembly 130. The middle frame 101 is arranged around the outer periphery of the back frame 102 and is provided with a supporting portion 104. The supporting portion 104 extends toward the opening. A photosensitive color-changing layer 110 is provided on the supporting portion 104. The photosensitive color-changing layer 110 can sense the brightness of the light of the backlight module and change its own color according to the brightness, thereby changing its own reflectivity to the light, avoiding the formation of bright lines or dark lines at the supporting portion 104, and improving the display effect of the display screen 300.

[0033] Alternatively, color value is also called the brightness of the color. Value refers to the brightness of the color. Various colored objects produce different shades of color due to the difference in the amount of light they reflect.

[0034] Optically variable materials are compounds with light-changing functions. When stimulated by light of a certain wavelength and intensity, their molecular structure will undergo a reversible change, which is intuitively manifested as a change in color, from light to dark. When the light stimulation stops, the structure of the compound will return to its initial state, which is intuitively manifested as the color fading to its initial state, that is, the dark color changes to a light color. Optically variable materials include photochromic pastes, photochromic dyes, and photochromic powders.

[0035] Photochromic paste is made through a strictly controlled process and can be directly dispersed into water-based system coatings. The patterns printed with this color paste will change from colorless to colored or from colored to colored under sunlight or ultraviolet light.

[0036] Optically variable dyes need to be dissolved in a suitable medium (such as oily solvents, resins) to produce light-changing phenomena. The polarity of the medium has a great influence on the color-changing properties of the optically variable dyes. Before use, proofing should be performed to confirm the color development state.

[0037] The average particle size of the optically variable powder is 3±1μm. It is an optically variable material processed and prepared using microcapsule technology. It is easy to use and has wide applicability. It can be used in ink, coating, injection molding and other fields. Optically variable materials with different properties can be selected according to the backlight assembly 130 with different brightness requirements to achieve the color change requirement.

[0038] In some embodiments, the support portion 104 is arranged along the circumference of the accommodating cavity 103 and is arranged in an annular structure, and the photosensitive color-changing layer 110 is arranged along the circumference of the accommodating cavity 103 and is also arranged in an annular structure, thereby avoiding the appearance of bright lines or dark lines around the support portion 104 and improving the display effect.

[0039] See also Figure 2 , Figure 4 and Figure 5 In some embodiments, the backlight structure 100 further includes a temperature-sensitive color-changing layer 120 made of a temperature-changing material and located at the support portion 104; the temperature-sensitive color-changing layer 120 is used to sense the temperature of the backlight assembly 130, and when the temperature of the backlight assembly 130 increases to a third predetermined value, the color brightness of the temperature-sensitive color-changing layer 120 decreases, and the temperature-sensitive color-changing layer 120 reduces the reflection of the light; when the temperature of the backlight assembly 130 decreases to a fourth predetermined value, the color brightness of the temperature-sensitive color-changing layer 120 increases, and the temperature-sensitive color-changing layer 120 increases the reflection of the light, and the third predetermined value is greater than the fourth predetermined value.

[0040] See also Figure 2 , Figure 4 and Figure 5 It can be understood that the color change of the thermochromic layer 120 is the same as the color change of the color-changing material. When the brightness of the backlight assembly 130 increases, the heat generated by the backlight assembly 130 increases, so that the temperature of the support portion 104 increases to a third predetermined value, and the color of the thermochromic layer 120 changes from a dark color to a light color; when the brightness of the backlight assembly 130 decreases, the heat generated by the backlight assembly 130 decreases, the temperature of the support portion 104 decreases to a fourth predetermined value, and the color of the thermochromic layer 120 changes from a light color to a dark color.

[0041] See also Figure 2 , Figure 4 and Figure 5It can be understood that when the temperature of the backlight assembly 130 is increased to a certain level, the color of the thermochromic layer 120 is changed from a light color to a dark color, or from a light color to a dark color, such as gradually changing from white to gray, or even to black, and the reflection of light is reduced to avoid the appearance of bright lines; when the temperature of the backlight assembly 130 is reduced to a certain level, the color of the thermochromic layer 120 is changed from a dark color to a light color, or from a dark color to a light color, such as gradually changing from black to gray, or even from gray to white again, and the reflection of light is increased to avoid the appearance of dark lines.

[0042] Optionally, the temperature of the backlight assembly 130 varies from 18 to 50 degrees, the fourth predetermined value can be set to 18 to 28 degrees, and the third predetermined value can be set to 40 to 50 degrees. When the temperature of the backlight assembly 130 is between 28 and 40 degrees, the color of the thermochromic layer 120 does not change.

[0043] In some embodiments, the thermochromic layer 120 and the photochromic layer 110 are located on the same surface of the support portion 104 and are arranged at intervals, thereby avoiding the appearance of bright lines or dark lines at the support portion 104 through the color changes of the thermochromic layer 120 and the photochromic layer 110 .

[0044] In some embodiments, the thermochromic layer 120 and the photochromic layer 110 are located on different surfaces of the support portion 104 , thereby avoiding bright lines or dark lines at the support portion 104 through the color changes of the thermochromic layer 120 and the photochromic layer 110 .

[0045] See also Figure 1 In some embodiments, the supporting portion 104 has a first surface 1041 facing the bottom of the accommodating cavity 103, a second surface 1042 arranged opposite to the first surface 1041, and a third surface 1043 located between the first surface 1041 and the second surface 1042, and at least one of the first surface 1041, the second surface 1042 and the third surface 1043 is provided with the photosensitive color-changing layer 110 and / or the temperature-sensitive color-changing layer 120.

[0046] See also Figure 1 It can be understood that at least one of the first surface 1041, the second surface 1042 and the third surface 1043 is provided with the temperature-sensitive color-changing layer 120 and the photosensitive color-changing layer 110. Thus, the color changes of the temperature-sensitive color-changing layer 120 and the photosensitive color-changing layer 110 can avoid the appearance of bright lines or dark lines at the support portion 104.

[0047] The temperature-sensitive color-changing layer 120 is disposed on at least one of the first surface 1041 , the second surface 1042 and the third surface 1043 . Thus, the color change of the temperature-sensitive color-changing layer 120 can prevent bright lines or dark lines from appearing at the support portion 104 .

[0048] At least one of the first surface 1041 , the second surface 1042 and the third surface 1043 is provided with the photosensitive color-changing layer 110 , so as to avoid bright lines or dark lines appearing at the support portion 104 through the color change of the photosensitive color-changing layer 110 .

[0049] In some embodiments, the support portion 104 is made of a plastic material, the light-variable material and / or the temperature-variable material are mixed with the plastic material in a predetermined ratio, such as one portion of light-variable material mixed with one portion of temperature-variable material, and then one portion of plastic material, and the light-sensitive color-changing layer 110 and / or the temperature-sensitive color-changing layer 120 are integrally injection molded with the support portion 104. In this embodiment, the middle frame 101 and the support portion 104 are both made of plastic material and are integrally injection molded.

[0050] See also Figure 3 It is understood that the plastic material and the light-changing material are mixed in a certain ratio, and the support part 104 is integrally formed by injection molding, so that the light-sensitive color-changing layer 110 is integrated into the support part 104, and the support part 104 as a whole has the function of the light-sensitive color-changing layer 110. At the same time, the temperature-sensitive color-changing layer 120 can also be set on the support part 104.

[0051] See also Figure 4 It is understood that the plastic material and the temperature-changing material are mixed in a certain proportion, and the support part 104 is integrally formed by an injection molding process, so that the temperature-sensitive color-changing layer 120 is integrated into the support part 104, and the support part 104 as a whole has the function of the photosensitive color-changing layer 110. At the same time, the photosensitive color-changing layer 110 can also be arranged on the support part 104.

[0052] It can be understood that the plastic material, the temperature-sensitive material and the light-sensitive material are mixed in a certain proportion, and the support part 104 is integrally formed through an injection molding process, so that the photosensitive color-changing layer 110 and the temperature-sensitive color-changing layer 120 are integrated into the support part 104, and the support part 104 as a whole has the functions of the photosensitive color-changing layer 110 and the temperature-sensitive color-changing layer 120.

[0053] In some embodiments, the photosensitive color-changing layer 110 and / or the temperature-sensitive color-changing layer 120 is also disposed at a position of the cavity wall of the accommodating cavity 103 adjacent to the opening, thereby avoiding the appearance of bright lines or dark lines at the edge of the supporting portion 104 .

[0054] See also Figure 1In some embodiments, the backlight assembly 130 includes a light guide plate 105 and an optical film layer disposed on the light guide plate 105 , and the edge of the light guide plate 105 adjacent to the cavity wall of the accommodating cavity 103 is also provided with the photosensitive color-changing layer 110 and / or the temperature-sensitive color-changing layer 120 , thereby avoiding the appearance of bright lines or dark lines at the edge of the supporting portion 104 .

[0055] Optionally, the optical film layer includes a lower diffusion film 106 , a lower prism 107 , an upper prism 108 and an upper diffusion film 109 which are sequentially arranged on the light guide plate 105 .

[0056] In some embodiments, the outer surface of the middle frame 101 is provided with the temperature-sensitive color-changing layer 120 in a predetermined shape. Optionally, the temperature-sensitive color-changing layer 120 on the outer surface of the middle frame 101 can be set to an icon shape with a warning meaning, such as an exclamation mark or lightning. When the temperature-sensitive color-changing layer 120 at this position changes, it can prompt the user that the temperature of the backlight structure 100 is rising, thereby improving the safety of use.

[0057] See also Figure 7 The present invention further proposes a display screen 300, which includes a backlight structure 100. The specific structure of the backlight structure 100 refers to the above embodiment. Since the display screen 300 adopts all the technical solutions of all the above embodiments, it also has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0058] In some embodiments, the display screen 300 further includes a display panel 200 . The display panel 200 is located at the opening, and an edge of the display panel 200 is supported by the support portion 104 .

[0059] Optionally, the display screen 300 further includes a buffer pad disposed on the support portion 104 , and the buffer pad is located between the support portion 104 and the display panel 200 .

[0060] The above are only optional embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A backlight structure, characterized in that: include: A back frame having a accommodating cavity, a middle frame arranged around the outside of the back frame, a backlight assembly located in the accommodating cavity, and a photosensitive color-changing layer made of a photosensitive material, wherein the accommodating cavity has an opening, and a supporting portion is extended from the edge of the middle frame toward the opening, and the photosensitive color-changing layer is located in the supporting portion; the photosensitive color-changing layer is used to sense the brightness of the light of the backlight assembly; when the brightness of the backlight assembly increases to a first predetermined value, the color brightness of the photosensitive color-changing layer decreases, and the photosensitive color-changing layer reduces the reflection of the light; when the brightness of the backlight assembly decreases to a second predetermined value, the color brightness of the photosensitive color-changing layer increases, and the photosensitive color-changing layer increases the reflection of the light, and the first predetermined value is greater than the second predetermined value; the supporting portion is made of a plastic material, the photosensitive material and the plastic material are mixed in a predetermined proportion, and the photosensitive color-changing layer and the supporting portion are integrally injection molded.

2. The backlight structure according to claim 1, characterized in that: The support portion is arranged along the circumference of the accommodating cavity and is arranged in an annular structure, and the photosensitive color-changing layer is arranged along the circumference of the accommodating cavity and is arranged in an annular structure.

3. The backlight structure according to claim 1, wherein: The backlight structure also includes a thermochromic layer made of a temperature-changing material and located at the support part; the thermochromic layer is used to sense the temperature of the backlight assembly, and when the temperature of the backlight assembly rises to a third predetermined value, the color brightness of the thermochromic layer decreases, and the thermochromic layer reduces reflection of the light; when the temperature of the backlight assembly decreases to a fourth predetermined value, the color brightness of the thermochromic layer increases, and the thermochromic layer increases reflection of the light, and the third predetermined value is greater than the fourth predetermined value.

4. The backlight structure according to claim 3, wherein: The temperature-sensitive color-changing layer and the photosensitive color-changing layer are located on the same surface of the support portion and are arranged at intervals; or, the temperature-sensitive color-changing layer and the photosensitive color-changing layer are located on different surfaces of the support portion.

5. The backlight structure according to claim 3, characterized in that: The supporting portion has a first surface facing the bottom of the accommodating cavity, a second surface arranged opposite to the first surface, and a third surface located between the first surface and the second surface, and at least one of the first surface, the second surface and the third surface is provided with the photosensitive color-changing layer and / or the temperature-sensitive color-changing layer.

6. The backlight structure according to claim 3, characterized in that: The support part is made of plastic material, the temperature-changing material and the plastic material are mixed in a predetermined ratio, and the temperature-sensitive color-changing layer and the support part are integrally injection-molded.

7. The backlight structure according to any one of claims 3 to 6, characterized in that: The photosensitive color-changing layer and / or the temperature-sensitive color-changing layer are also arranged at a position of the cavity wall of the accommodating cavity adjacent to the opening.

8. The backlight structure according to any one of claims 3 to 6, characterized in that: The backlight assembly includes a light guide plate and an optical film layer arranged on the light guide plate, and the edge of the light guide plate adjacent to the cavity wall of the accommodating cavity is also provided with the photosensitive color-changing layer and / or the temperature-sensitive color-changing layer.

9. The backlight structure according to any one of claims 3 to 6, characterized in that: The outer surface of the middle frame is provided with the temperature-sensitive color-changing layer in a predetermined shape.

10. A display screen, characterized in that: Including the backlight structure as described in any one of claims 1-9, the display screen also includes a display panel, the display panel is located at the opening, and the edge of the display panel is supported by the supporting part.

Images