Light mixing device and backlight display apparatus

Abstract

The application discloses a light mixing device and a backlight display device. The light mixing device comprises a support, a light source and a light mixing piece. The light source is arranged on the support, and the light mixing piece is arranged on the support. The light mixing piece is in the shape of a circular truncated cone. The peripheral wall of the light mixing piece is a light-reflecting wall. One end of the light mixing piece in the axial direction is an incident end, and the other end of the light mixing piece in the axial direction is an emission end. The outer diameter of the incident end is greater than that of the emission end. The incident end is used for allowing light from the light source to enter the light mixing piece, and the emission end is used for allowing light in the light mixing piece to exit the light mixing piece. The application can effectively solve the problems of color deviation and uneven mixing of light.

Description

Technical Field

[0001] This application relates to the field of backlight display equipment technology, and in particular to a light mixing device and a backlight display equipment. Background Technology

[0002] In related technologies, RGB LED chips typically include red LED chips, green LED chips, and blue LED chips. Red LED chips can emit red light (R light), green LED chips can emit green light (G light), and blue LED chips can emit blue light (B light). In other words, RGB LED chips can emit red, green, and blue light.

[0003] However, since optical devices such as lenses and reflectors have different transmittance or reflectance for different colors of light, the light emitted by RGB LEDs will cause some colors of light to increase in intensity and others to decrease in intensity after being transmitted or reflected by optical devices such as lenses and reflectors. This will disrupt the original color balance of RGB LEDs and result in color distortion and uneven light mixing. Summary of the Invention

[0004] In view of the above-mentioned deficiencies in the related technologies, this application provides a light mixing device and a backlight display device to solve the problems of color deviation and uneven light mixing in the related technologies.

[0005] To address the aforementioned technical problems, in a first aspect, this application provides a light mixing device, which includes:

[0006] support;

[0007] A light source, which is disposed on the bracket;

[0008] A light mixing element is disposed on the bracket. The light mixing element is frustum-shaped, and its peripheral wall is a reflective wall. One axial end of the light mixing element is an injection end, and the other axial end is an emission end. The outer diameter of the injection end is larger than the outer diameter of the emission end. The injection end allows light from the light source to enter the light mixing element, and the emission end allows light from the light source inside the light mixing element to exit the light mixing element.

[0009] With this configuration, since one axial end of the frustum-shaped light mixer is the injection end and the other axial end is the emission end, and since the outer diameter of the injection end is larger than the outer diameter of the emission end, when the light source is an RGB LED, the three-color light emitted by the RGB LED enters the light mixer through the injection end, and the three-color light will be directed toward the peripheral wall of the light mixer. Since the peripheral wall of the frustum-shaped light mixer is a reflective wall, the reflective wall can reflect the three-color light multiple times. The process of multiple reflections is like a process of constantly stirring the light, which can disrupt and average the propagation path of the three-color light. This is conducive to the full mixing of the three-color light and to achieving a relatively balanced state of intensity of the three-color light, thereby helping to solve the problems of color deviation and uneven light mixing.

[0010] Secondly, this application provides a light mixing device, which includes:

[0011] support;

[0012] A light source, which is disposed on the bracket;

[0013] A light mixing element is disposed on the bracket. The light mixing element is frustum-shaped, and its peripheral wall is a reflective wall. One axial end of the light mixing element is an injection end, and the other axial end is an emission end. The outer diameter of the injection end is larger than the outer diameter of the emission end. Along the axial direction of the light mixing element, the light source is disposed on the side of the light mixing element closer to the injection end.

[0014] With this configuration, since one end of the frustum-shaped light mixer is the injection end and the other end is the emission end, and since the light source is positioned on the side of the light mixer closer to the injection end along its axis, and the outer diameter of the injection end is larger than that of the emission end, when the light source is an RGB LED, the three-color light emitted by the RGB LED can enter the light mixer through the injection end. After entering the light mixer, the three-color light will be directed towards the peripheral wall of the light mixer. Since the peripheral wall of the frustum-shaped light mixer is a reflective wall, the reflective wall can reflect the three-color light multiple times. The process of multiple reflections is like a process of continuously stirring the light, which can disrupt and average the propagation path of the three-color light. This is conducive to fully mixing the three-color light and to achieving a relatively balanced state of intensity of the three-color light, thereby helping to solve the problems of color deviation and uneven light mixing.

[0015] Optionally, the end face of the injection end is a frosted surface.

[0016] With this configuration, since the mixed light will exit the mixing element through the end face of the emission end, setting the end face of the emission end to a frosted surface will cause the mixed light to diffuse in all directions when it reaches the frosted surface due to the tiny particles or irregular surface of the frosted surface, thus scattering the emitted light. This is similar to breaking up a concentrated beam of light, allowing the light to be distributed more evenly over a larger angular range after emission.

[0017] Optionally, the light mixing element is a hollow light mixing shell, the light mixing shell surrounds a light mixing cavity, and the light mixing cavity is frustum-shaped.

[0018] This design, on the one hand, ensures that the mixing cavity, enclosed by the mixing shell, is also frustum-shaped, and since the peripheral wall of the frustum-shaped mixing element is a reflective wall, the inner peripheral wall of the mixing cavity is also a reflective wall. Thus, after light enters the mixing cavity from the input end, it is continuously reflected on the inner peripheral wall of the mixing cavity as it propagates towards the output end. Furthermore, the light reflected from different positions can intersect and mix within the mixing cavity. This multiple reflections and cross-mixing within the hollow cavity, to a certain extent, is more conducive to the uniform mixing of different colors of light compared to a solid structure, thereby further optimizing the mixing effect and reducing color casts and unevenness in the mixing process.

[0019] Optionally, an injection port is provided on the end face of the injection end, the injection port is connected to the mixing cavity, and the injection port allows the light from the light source to enter the mixing cavity.

[0020] This configuration serves several purposes. Firstly, since all light emitted from the light source enters the mixing cavity through the injection port, the injection port design allows the light emitted from the light source to enter the mixing cavity in a concentrated manner. This helps to prevent the light from entering the mixing cavity in a scattered manner, which in turn helps to make the initial light distribution in the mixing cavity uniform, thus laying a good foundation for subsequent uniform light mixing.

[0021] On the other hand, since the entrance can restrict the position of light entering the mixing cavity, it can, to a certain extent, limit the initial movement position and direction of light in the mixing cavity. This helps to make the reflection and mixing process of light in the mixing cavity more orderly, thereby improving the mixing efficiency between different colors of light and further reducing the possibility of color deviation and uneven mixing.

[0022] Optionally, the light mixing element is a transparent element, and a reflective layer is provided on the peripheral wall of the light mixing element, the reflective layer being used to reflect the light inside the light mixing element.

[0023] With this design, since the light-mixing component is transparent and the transparent material allows light to pass through relatively easily, the energy loss of light passing through the light-mixing component is relatively small, and excessive energy loss is not due to absorption by the material itself. In addition, a reflective layer is provided on the peripheral wall of the light-mixing component, which ensures that the peripheral wall of the light-mixing component has normal reflective function.

[0024] Optionally, the light-mixing component is a polymethyl methacrylate component or a polycarbonate component.

[0025] This configuration, due to the excellent optical transparency of polymethyl methacrylate (PMMA) and polycarbonate (PC), allows for less energy loss when light passes through the mixing element, creating better conditions for the subsequent mixing process. Furthermore, this excellent optical transparency helps maintain light intensity and color purity, significantly reducing color cast issues during mixing.

[0026] Optionally, the reflective layer is an aluminum layer.

[0027] This design has several advantages. First, aluminum has extremely high reflectivity, so when light propagates through the mixing element and reaches the aluminum layer, most of the light is efficiently reflected. This enhances the mixing effect of light within the mixing cavity, improves the uniformity of light mixing, and further reduces color cast and uneven light mixing.

[0028] On the other hand, aluminum forms a dense aluminum oxide film in the air, which effectively protects the aluminum layer from further oxidation or corrosion. During the use of the light mixing device, even under different environmental conditions, such as humid environments or atmospheres containing small amounts of chemicals, the aluminum reflective layer maintains stable performance. This helps ensure the durability of the reflective layer's reflective properties, thereby guaranteeing the long-term stable operation of the light mixing device.

[0029] Optionally, the light mixing device further includes:

[0030] A convex lens, which is disposed on the outside of the light mixing element.

[0031] This configuration serves two purposes. Firstly, because convex lenses have the characteristic of converging light, they can focus the light emitted from the light-mixing element, thereby concentrating the energy distribution of the light and improving the intensity of the light in the target area.

[0032] On the other hand, as a component covering the outside of the light mixing element, the convex lens can provide physical protection for the light mixing element, preventing external impurities such as dust and moisture from directly contacting the light mixing element and avoiding the impact of impurities on the optical performance of the light mixing element.

[0033] Thirdly, this application also provides a backlight display device, the device comprising:

[0034] The light mixing device described in either the first or second aspect.

[0035] This configuration effectively solves the problems of color distortion and uneven light mixing caused by the light mixing device, thus ensuring a high degree of consistency in the intensity of different colors of light emitted by the backlight. This results in uniform color performance across different areas of the screen when displaying various images, preventing localized color shifts or uneven brightness, and presenting users with a more realistic and detailed image effect. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 A perspective view of the light mixing device (convex lens not shown) provided in an embodiment of this application;

[0038] Figure 2 A top view of the light mixing device (without showing the convex lens) provided in an embodiment of this application;

[0039] Figure 3 for Figure 2 A sectional view along the AA direction;

[0040] Figure 4 A perspective view of the bracket provided in the embodiments of this application;

[0041] Figure 5 A perspective view of the light mixing component provided in the embodiments of this application;

[0042] Figure 6 A bottom view of the light mixing component provided in the embodiments of this application;

[0043] Figure 7 for Figure 6 A sectional view along the BB direction;

[0044] Figure 8 A perspective view of the light mixing device provided in the embodiments of this application;

[0045] Figure 9 A top view of the light mixing device provided in the embodiments of this application;

[0046] Figure 10 for Figure 9 A cross-sectional view along the CC direction.

[0047] Explanation of reference numerals in the attached figures:

[0048] 1-Staff;

[0049] 2-Light source;

[0050] 3-Light mixing component; 31-Peripheral wall; 32-Injection end; 321-Injection entrance; 33-Ejection end; 34-Light mixing cavity;

[0051] 4-convex lens;

[0052] 100- Mixing device. Detailed Implementation

[0053] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0054] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0055] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0056] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; 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, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0057] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, elements, or components (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0058] As described in the background section of this application, in related technologies, RGB LED chips typically include red LED chips, green LED chips, and blue LED chips. The red LED chip can emit red light (R light), the green LED chip can emit green light (G light), and the blue LED chip can emit blue light (B light). In other words, RGB LED chips can emit red, green, and blue light.

[0059] However, since optical devices such as lenses and reflectors have different transmittance or reflectance for different colors of light, the light emitted by RGB LEDs will cause some colors of light to increase in intensity and others to decrease in intensity after being transmitted or reflected by optical devices such as lenses and reflectors. This will disrupt the original color balance of RGB LEDs and result in color distortion and uneven light mixing.

[0060] In view of the above-mentioned problems, this application provides a light mixing device to solve the problems of color deviation and uneven light mixing in related technologies.

[0061] The technical solution of this application will be further described below with reference to specific embodiments and accompanying drawings:

[0062] In some embodiments, such as Figure 1 , Figure 2 and Figure 3 As shown, the light mixing device 100 includes a support 1 and a light source 2, wherein, as Figure 3 and Figure 4 As shown, the light source 2 is mounted on the bracket 1. This arrangement allows the bracket 1 to provide stable support and fix the position of the light source 2, which helps to prevent the position of the light source 2 from shifting due to movement, vibration, or external interference of the device, and thus helps to ensure that the light can be emitted normally according to the design requirements.

[0063] In some embodiments, such as Figure 1 , Figure 2 and Figure 3 As shown, the light mixing device 100 also includes a light mixing element 3, which is disposed on the support 1. The light mixing element 3 is frustum-shaped, as shown in the figure. Figure 5 , Figure 6 and Figure 7 As shown, the peripheral wall 31 of the light mixing element 3 is a reflective wall, and the axial direction of the light mixing element 3 (as shown) Figure 7 The light source 2 enters the light mixing element 3 through the Y direction (in the middle) and exits the light mixing element 3 through the axial direction. The outer diameter of the light source 32 is larger than that of the light mixing element 33. The light source 2 enters the light mixing element 3 through the light source 2 through the light mixing element 3 through the light mixing element 3 through the light mixing element 3.

[0064] With this configuration, since one axial end of the frustum-shaped light mixing element 3 is the injection end 32 and the other axial end is the emission end 33, and since the outer diameter of the injection end 32 is larger than the outer diameter of the emission end 33, when the light source 2 is an RGB LED, the three-color light emitted by the RGB LED enters the light mixing element 3 through the injection end 32, and the three-color light will be directed toward the peripheral wall 31 of the light mixing element 3. Since the peripheral wall 31 of the frustum-shaped light mixing element is a reflective wall, the reflective wall can reflect the three-color light multiple times. The process of multiple reflections is like a process of constantly stirring the light, which can disrupt and average the propagation path of the three-color light, thereby facilitating the full mixing of the three-color light and helping to achieve a relatively balanced state of intensity of the three-color light, thus helping to solve the problems of color deviation and uneven light mixing.

[0065] In some embodiments, such as Figure 1 , Figure 2 and Figure 3 As shown, the light mixing device 100 includes a support 1, a light source 2, and a light mixing component 3. Wherein, as... Figure 3 and Figure 4 As shown, light source 2 is mounted on bracket 1. Light mixing element 3 is mounted on bracket 1; light mixing element 3 is frustum-shaped, as shown... Figure 5 , Figure 6 and Figure 7 As shown, the peripheral wall 31 of the light mixing element 3 is a reflective wall, and the axial direction of the light mixing element 3 (as shown) Figure 7 The light source 2 enters the light mixing element 3 through the Y direction (in the middle) and exits the light mixing element 3 through the axial direction. The outer diameter of the light source 32 is larger than that of the light mixing element 33. The light source 2 enters the light mixing element 3 through the light source 2 through the light mixing element 3 through the light mixing element 3 through the light mixing element 3.

[0066] With this configuration, since one axial end of the frustum-shaped light mixing element 3 is the injection end 32 and the other axial end is the emission end 33, and since the outer diameter of the injection end 32 is larger than the outer diameter of the emission end 33, when the light source 2 is an RGB LED, the three-color light emitted by the RGB LED enters the light mixing element 3 through the injection end 32, and the three-color light will be directed toward the peripheral wall 31 of the light mixing element 3. Since the peripheral wall 31 of the frustum-shaped light mixing element is a reflective wall, the reflective wall can reflect the three-color light multiple times. The process of multiple reflections is like a process of constantly stirring the light, which can disrupt and average the propagation path of the three-color light, thereby facilitating the full mixing of the three-color light and helping to achieve a relatively balanced state of intensity of the three-color light, thus helping to solve the problems of color deviation and uneven light mixing.

[0067] In some embodiments, such as Figure 1 , Figure 2 and Figure 3 As shown, the light mixing device 100 also includes a light mixing element 3, which is disposed on the support 1. The light mixing element 3 is frustum-shaped, as shown in the figure. Figure 5 , Figure 6and Figure 7 As shown, the peripheral wall 31 of the light mixing element 3 is a reflective wall, and the axial direction of the light mixing element 3 (as shown) Figure 7 In the Y-direction of the light mixing element 3, one end is the injection end 32, and the other end is the emission end 33. The outer diameter of the injection end 32 is larger than the outer diameter of the emission end 33. In the axial direction of the light mixing element 3 (e.g., in the Y direction), one end is the injection end 32, and the other end is the emission end 33. Figure 3 In the Y direction, the light source 2 is positioned on the side of the light mixing element 3 near the injection end 32.

[0068] With this configuration, since one axial end of the frustum-shaped light mixing element 3 is the injection end 32 and the other axial end is the emission end 33, and since the light source 2 is positioned on the side of the light mixing element 3 closer to the injection end 32 along the axial direction of the light mixing element 3, and the outer diameter of the injection end 32 is larger than the outer diameter of the emission end 33, when the light source 2 is an RGB LED, the three-color light emitted by the RGB LED can enter the light mixing element 3 through the injection end 32. After entering the light mixing element 3, the three-color light will be directed toward the peripheral wall 31 of the light mixing element 3. Since the peripheral wall 31 of the frustum-shaped light mixing element 3 is a reflective wall, the reflective wall can reflect the three-color light multiple times. The process of multiple reflections is like a process of constantly stirring the light, which can disrupt and average the propagation path of the three-color light. This is conducive to fully mixing the three-color light and to achieving a relatively balanced state of intensity of the three-color light, thereby helping to solve the problems of color deviation and uneven light mixing.

[0069] In some embodiments, such as Figure 1 , Figure 2 and Figure 3 As shown, the light mixing device 100 includes a support 1, a light source 2, and a light mixing component 3. Wherein, as... Figure 3 and Figure 4 As shown, light source 2 is mounted on bracket 1. Light mixing element 3 is mounted on bracket 1; light mixing element 3 is frustum-shaped, as shown... Figure 5 , Figure 6 and Figure 7 As shown, the peripheral wall 31 of the light mixing element 3 is a reflective wall, and the axial direction of the light mixing element 3 (as shown) Figure 7 In the Y-direction of the light mixing element 3, one end is the injection end 32, and the other end is the emission end 33. The outer diameter of the injection end 32 is larger than the outer diameter of the emission end 33. In the axial direction of the light mixing element 3 (e.g., in the Y direction), one end is the injection end 32, and the other end is the emission end 33. Figure 3 In the Y direction, the light source 2 is positioned on the side of the light mixing element 3 near the injection end 32.

[0070] With this configuration, since one axial end of the frustum-shaped light mixing element 3 is the injection end 32 and the other axial end is the emission end 33, and since the light source 2 is positioned on the side of the light mixing element 3 closer to the injection end 32 along the axial direction of the light mixing element 3, and the outer diameter of the injection end 32 is larger than the outer diameter of the emission end 33, when the light source 2 is an RGB LED, the three-color light emitted by the RGB LED can enter the light mixing element 3 through the injection end 32. After entering the light mixing element 3, the three-color light will be directed toward the peripheral wall 31 of the light mixing element 3. Since the peripheral wall 31 of the frustum-shaped light mixing element 3 is a reflective wall, the reflective wall can reflect the three-color light multiple times. The process of multiple reflections is like a process of constantly stirring the light, which can disrupt and average the propagation path of the three-color light. This is conducive to fully mixing the three-color light and to achieving a relatively balanced state of intensity of the three-color light, thereby helping to solve the problems of color deviation and uneven light mixing.

[0071] In some embodiments, the light source 2 may also be an organic light-emitting diode (OLED) or a quantum dot light-emitting diode (QLED). The type of light source 2 is flexible and can be selected according to the application scenario of the light mixing device 100. This application embodiment does not impose specific limitations on this.

[0072] In some embodiments, such as Figure 5 As shown, the end face of the injection end 33 is a frosted surface.

[0073] With this configuration, since the mixed light will exit the mixing element 3 through the end face of the emission end 33, setting the end face of the emission end 33 to a frosted surface will cause the light to diffuse in all directions when the mixed light reaches the frosted surface due to the tiny particles or irregular surface of the frosted surface, thus scattering the emitted light. This is similar to breaking up a concentrated beam of light, allowing the light to be distributed more evenly over a larger angular range after emission.

[0074] In some embodiments, the end face of the injection end 33 is a smooth surface. This configuration simplifies the structure of the end face of the injection end 33, thereby simplifying the processing of the end face of the injection end 33 to a certain extent, and thus facilitating the processing of the end face of the injection end 33.

[0075] In some embodiments, such as Figure 3 and Figure 7 As shown, the light mixing component 3 is a hollow light mixing shell, which surrounds a light mixing cavity 34, which is shaped like a frustum.

[0076] This configuration serves several purposes. First, since the mixing cavity 34, enclosed by the mixing shell, is also frustum-shaped, and since the peripheral wall 31 of the frustum-shaped mixing element 3 is a reflective wall, the inner peripheral wall of the mixing cavity 34 is also a reflective wall. Thus, after light enters the mixing cavity 34 from the injection end 32, it is continuously reflected on the inner peripheral wall of the mixing cavity 34 as it propagates towards the emission end 33. Furthermore, the light reflected from different positions can intersect and mix within the mixing cavity 34. This multiple reflections and cross-mixing within the hollow cavity, to a certain extent, is more conducive to the uniform mixing of different colors of light compared to a solid structure, thereby further optimizing the mixing effect and reducing color cast and unevenness in the mixing process.

[0077] In some embodiments, the light mixing element 3 is a solid part. This configuration simplifies the structure of the light mixing element 3 to some extent, thereby facilitating its processing and manufacturing.

[0078] In some embodiments, such as Figure 6 and Figure 7 As shown, an injection port 321 is provided on the end face of the injection end 32. The injection port 321 is connected to the mixing cavity 34, and the injection port 321 allows the light from the light source 2 to enter the mixing cavity 34.

[0079] With this configuration, on the one hand, since the light emitted by the light source 2 enters the mixing cavity 34 through the injection port 321, the setting of the injection port 321 allows the light emitted by the light source 2 to enter the mixing cavity 34 in a concentrated manner, which helps to avoid the light entering the mixing cavity 34 in a relatively dispersed manner, and thus helps to make the initial light distribution in the mixing cavity 34 uniform, which is conducive to laying a good foundation for subsequent uniform light mixing.

[0080] On the other hand, since the injection port 321 can restrict the position of light entering the mixing cavity 34, it can restrict the initial movement position and direction of light in the mixing cavity 34 to a certain extent. This helps to make the reflection and mixing process of light in the mixing cavity 34 more orderly, thereby improving the mixing efficiency between different colors of light and further reducing the possibility of color deviation and uneven mixing.

[0081] In some embodiments, the light mixing cavity 34 can be isolated from the external space of the light mixing component 3 by the end face of the injection end 32, the end face of the emission end 33, and the peripheral wall 31, that is, the light mixing cavity 34 is a closed chamber. Setting the light mixing cavity 34 as a closed chamber can effectively avoid interference from external factors on light mixing, thereby helping to make the light ratio and color more accurate.

[0082] In some embodiments, the light mixing element 3 is a transparent element, and a reflective layer is provided on the peripheral wall 31 of the light mixing element 3. The reflective layer is used to reflect the light inside the light mixing element 3.

[0083] With this configuration, since the light-mixing element 3 is transparent and the transparent material allows light to pass through relatively easily, the energy loss of light passing through the light-mixing element 3 is relatively small, and excessive energy loss is not due to absorption by the material itself. In addition, a reflective layer is provided on the peripheral wall 31 of the light-mixing element 3, which ensures that the peripheral wall 31 of the light-mixing element 3 has normal reflective function.

[0084] In some embodiments, the emitting end 33 is transparent, and the peripheral wall 31 of the light mixing element 3 is opaque and reflective. In this case, there is no need to provide a reflective layer on the peripheral wall 31. When the emitting end 32 has an emitting port 321 on its end face, the emitting end 32 can be opaque or transparent; when the end face of the emitting end 32 is a complete end face that closes the light mixing cavity 34, the emitting end 32 is transparent.

[0085] This configuration not only ensures that light can enter and exit the light mixing element 3 normally and that light mixing can be completed within the light mixing element 3, but also that the reflective peripheral wall 31 simplifies the configuration of the peripheral wall 31 and facilitates its processing.

[0086] In some embodiments, the light-mixing component 3 is a polymethyl methacrylate component or a polycarbonate component.

[0087] This configuration, due to the excellent optical transparency of polymethyl methacrylate (PMMA) and polycarbonate (PC), allows for the use of either PMMA or PC as the light mixing element 3. This minimizes energy loss as light passes through the element, creating better conditions for the subsequent light mixing process. Furthermore, this excellent optical transparency helps maintain light intensity and color purity, significantly reducing color cast issues during light mixing.

[0088] In other embodiments, the light mixing element 3 can also be any other transparent material. The material selection of the light mixing element 3 is more flexible. Specifically, it can be selected according to the actual use requirements. This application embodiment does not make specific limitations in this regard.

[0089] In some embodiments, the reflective layer is an aluminum layer.

[0090] This configuration serves several purposes. Firstly, because aluminum has extremely high reflectivity, most of the light is efficiently reflected when it propagates through the aluminum layer inside the light mixing element 3. This enhances the mixing effect of light within the light mixing cavity 34, improves the uniformity of light mixing, and further reduces color distortion and uneven light mixing.

[0091] On the other hand, aluminum forms a dense aluminum oxide film in the air, which effectively protects the aluminum layer from further oxidation or corrosion. During the use of the light mixing device 100, even under different environmental conditions, such as humid environments or atmospheres containing small amounts of chemicals, the aluminum reflective layer maintains stable performance. This helps ensure the durability of the reflective properties of the reflective layer, thereby ensuring the long-term stable operation of the light mixing device 100.

[0092] In some embodiments, the reflective layer is a silver layer.

[0093] With this configuration, since silver is a material with extremely high reflectivity, its reflectivity can reach up to about 95% in the visible light range. This means that when a silver reflective layer is used on the peripheral wall 31 of the light mixing component 3, the silver layer can reflect the vast majority of light during the reflection process within the light mixing cavity 34, reducing light absorption loss and thus improving the light mixing efficiency.

[0094] In other embodiments, the reflective layer can also be made of any other reflective material. The choice of material for the reflective layer is flexible; specifically, it can be selected according to actual needs, and this application does not impose specific limitations on this.

[0095] In some embodiments, such as Figure 8 and Figure 9 As shown, the light mixing device 100 also includes a convex lens 4, such as Figure 10 As shown, the convex lens 4 is mounted on the outside of the light mixing component 3.

[0096] With this configuration, on the one hand, since the convex lens 4 has the characteristic of converging light, it can gather the light emitted from the light mixing element 3, thereby making the energy distribution of the light more concentrated and improving the intensity of the light in the target area.

[0097] On the other hand, the convex lens 4, as a component covering the outside of the light mixing element 3, can provide physical protection for the light mixing element 3, preventing external impurities such as dust and moisture from directly contacting the light mixing element 3 and avoiding the impact of impurities on the optical performance of the light mixing element 3.

[0098] This application also provides a backlight display device, such as Figure 8 and Figure 9 As shown, the backlight display device includes a light mixing device 100. The light mixing device 100 has the same structure as any of the light mixing devices 100 in the above embodiments and can bring the same or similar beneficial effects. For details, please refer to the description in the above embodiments. This embodiment will not be repeated here.

[0099] This configuration, because the light mixing device 100 effectively solves the problems of color distortion and uneven light mixing, helps ensure that the intensity of different colors of light emitted by the backlight is highly consistent. This makes the color performance of different areas of the screen uniform and consistent when displaying various images, without local color distortion or uneven brightness, presenting users with a more realistic and delicate image effect.

[0100] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A light mixing device, characterized in that, include: support; A light source, which is disposed on the bracket; A light mixing element is disposed on the bracket. The light mixing element is frustum-shaped, and its peripheral wall is a reflective wall. One axial end of the light mixing element is an injection end, and the other axial end is an emission end. The outer diameter of the injection end is larger than the outer diameter of the emission end. The injection end allows light from the light source to enter the light mixing element, and the emission end allows light from the light source inside the light mixing element to exit the light mixing element.

2. A light mixing device, characterized in that, include: support; A light source, which is disposed on the bracket; A light mixing element is disposed on the bracket. The light mixing element is frustum-shaped, and its peripheral wall is a reflective wall. One axial end of the light mixing element is an injection end, and the other axial end is an emission end. The outer diameter of the injection end is larger than the outer diameter of the emission end. Along the axial direction of the light mixing element, the light source is disposed on the side of the light mixing element closer to the injection end.

3. The light mixing device according to claim 1 or 2, characterized in that, The end face of the injection end is a frosted surface.

4. The light mixing device according to claim 1 or 2, characterized in that, The light mixing component is a hollow light mixing shell, which surrounds a light mixing cavity, and the light mixing cavity is truncated cone-shaped.

5. The light mixing device according to claim 4, characterized in that, An injection port is provided on the end face of the injection end, and the injection port is connected to the mixing cavity. The injection port allows the light from the light source to enter the mixing cavity.

6. The light mixing device according to claim 1 or 2, characterized in that, The light mixing component is a transparent component, and a reflective layer is provided on the peripheral wall of the light mixing component. The reflective layer is used to reflect the light inside the light mixing component.

7. The light mixing device according to claim 6, characterized in that, The light-mixing component is a polymethyl methacrylate component or a polycarbonate component.

8. The light mixing device according to claim 6, characterized in that, The reflective layer is an aluminum layer.

9. The light mixing device according to claim 1 or 2, characterized in that, The light mixing device further includes: A convex lens, which is disposed on the outside of the light mixing element.

10. A backlight display device, characterized in that, include: The light mixing device according to any one of claims 1-9.

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