Patent Description:
When a liquid crystal display works, a liquid crystal material itself does not emit light, and needs to rely on a passive light source. The light source needs to illuminate a liquid crystal panel from the back, and light output is controlled to form an image. Currently, in a mainstream liquid crystal backlight technology in the market, an LED (Light Emitting Diode, light emitting diode) is used as a light source, and a side-emitting type structure or a direct-emitting type structure is usually used.

In the side-emitting type backlight structure, a light source is disposed on a side of a module. Light rays enter from the side and pass through a light guide plate. The light rays propagate inside a waveguide with a limitation by a waveguide function. The light rays are uniformly coupled and emitted gradually by using scattering dots, to form a surface light source. This solution has advantages of being light and thin. However, all LED light sources need to be always turned on to ensure uniform light output, and light emitting of the LED light sources cannot be adjusted based on brightness of an image region.

In the direct-emitting type backlight, light sources are disposed directly below a panel and uniformly arranged in an array. Light rays are shed directly on a display panel from below, to form uniform illumination on the display panel. A main characteristic of this structure is that light emitting brightness of a light source in a corresponding region may be controlled point by point based on brightness of a displayed image, to reduce power consumption and improve image contrast.

Because the direct-emitting type backlight structure uses a point light source, brightness in a vertical direction is much greater than that in a surrounding region, and a relatively long light mixture distance is required to change the point light source into a surface light source. Therefore, the direct-emitting type backlight structure is usually used in a large-size product insensitive to a thickness such as a television and is difficult to be made thin, and therefore cannot be applied to a scenario such as a mobile phone display that needs to be highly thin.

The document <CIT> shows a backlight unit and liquid crystal display device including the backlight unit. Especially, a repeated reflection of light emitted by light sources between layers of the backlight unit is shown.

The document <CIT> shows a liquid crystal display comprising a trenched light guide plate with a light-emitting diode array in the trench.

The document <CIT> shows a liquid crystal display device comprising a liquid crystal panel and a backlight unit under the liquid crystal panel.

The document <CIT> shows a display comprising an array of pixels and a backlight for illuminating the array of pixels, where the backlight comprises a two-dimensional array of light-emitting diodes.

The document <CIT> shows a light guiding plate comprising a scattering portion to scatter light emitted from a light-emitting element, and a limiting portion to block light going toward outside.

The document <CIT> shows a backlight unit comprising a light guide panel with a concaved light receiving region and means for light intensity adjustment opposite to the concaved region.

The present invention is defined by the independent claim.

This application provides a backlight module, a display, and a mobile terminal, to reduce a light mixture distance in a backlight structure.

According to a first aspect of the claimed invention, a backlight module is provided. The backlight module mainly includes three parts: a backplane having a light reflecting surface, a light source layer disposed on the light reflecting surface, and at least one light mixing component disposed on the light source layer. The light source layer has at least one point light source, and the at least one light mixing component is in a one-to-one correspondence with the at least one point light source. Each light mixing component includes a light reflecting layer configured to reflect some light rays emitted by a corresponding point light source, and a light transmission layer configured to transmit a light ray reflected by the light reflecting layer and then reflected again by the light reflecting surface. The light reflecting layer is disposed above the light source layer and is configured to reflect the some light rays emitted by the corresponding point light source. The light reflecting layer reflects the some light rays emitted by the point light source, and the some light rays are reflected again by the light reflecting surface on the backplane and then emitted from the light transmission layer. In this way, the light rays are more uniformly emitted from the backlight module, and a light mixture distance of the backlight structure is reduced.

A light diffusion structure is disposed on at least one of a light input surface and a light output surface of the light transmission layer, to improve light output uniformity of the light transmission layer.

The light diffusion structure is a concave-convex structure disposed on the light input surface or the light output surface, to facilitate disposing. A shape of the concave-convex structure may be specifically a jagged shape, to facilitate disposing and improve light output uniformity of the light transmission layer.

In a specific implementation, scattering particles are provided in the light transmission layer, to improve light output uniformity of the light transmission layer.

In a specific implementation, the light reflecting layer is disposed on a surface that is on the light source layer and that is away from the backplane.

In a specific implementation, that is not according to the claims, the light reflecting layer is a light reflecting coating covering the surface that is on the light source layer and that is away from the backplane, to facilitate disposing of the light reflecting layer.

In a specific implementation, that is not according to the claims, a vertical distance between the light reflecting layer and the light reflecting surface gradually increases in a direction away from the point light source, so that more light rays emitted by the point light source are emitted from a region away from the point light source, thereby improving a light mixing effect.

In a specific implementation, that is not according to the claims, the light output surface of the light transmission layer is a convex or concave surface, so that a light ray is emitted from the light transmission layer.

In a specific implementation, that is not according to the claims, each light mixing component further includes at least one column that is disposed on the light reflecting layer or the light transmission layer and that can reflect light, to form an air layer used for light mixing above the light transmission layer and the light reflecting layer, thereby improving a light mixing effect.

In a specific implementation, that is not according to the claims, an area of a cross section of each of the at least one column gradually decreases in a direction away from the light reflecting surface, to prevent the column from affecting light mixing.

In a specific implementation, that is not according to the claims, the backlight module further includes a substrate that is disposed on the light source layer and that can transmit light, the light reflecting layer is disposed on a surface that is on the substrate and that is away from the light source layer, and the light transmission layer is a part of the substrate that is not covered by the light reflecting layer. During manufacturing, the light mixing component is first disposed on the substrate, and then the substrate is disposed on the light source layer, to improve an overall yield rate.

In a specific implementation, that is not according to the claims, a plurality of through holes that can transmit light are provided on the light reflecting layer, so that some light rays are output from the through holes on the light reflecting layer, thereby improving a light mixing effect.

In a specific implementation, that is not according to the claims, the backlight module further includes a protective layer for encapsulating the light reflecting layer, to protect the backlight module.

According to the claimed invention, the backlight module further includes a light guide layer disposed on the at least one light mixing component. The light transmission layer is a plurality of gluing layers disposed between the light guide layer and the light source layer, and the plurality of gluing layers are arranged at intervals to form an air layer between adjacent gluing layers. The light reflecting layer is the air layer. The air layer is used as the light reflecting layer, so that the some light rays emitted by the point light source may be emitted from the air layer, and after being reflected, the some light rays are reflected at least once and are emitted from the gluing layer, thereby improving a light mixing effect.

In a specific implementation, an area of each of the plurality of gluing layers gradually increases from a position close to the corresponding point light source to a position that is away from the corresponding point light source, so that more light rays are emitted from an edge region of the point light source, thereby improving a light mixing effect.

In a specific implementation, the light guide layer includes a prism film bonded to the plurality of gluing layers and a diffusion film disposed on the prism film, to improve a light mixing effect.

In a specific implementation, the light reflecting surface is a diffuse reflecting surface or a specular reflecting surface with a high reflectivity, to improve reflecting efficiency of the reflecting surface.

According to a second aspect of the claimed invention, a display is provided. The display includes any one of the foregoing backlight modules, that are according to the claims, a polarizer stacked on a side that is of the backlight module and that is away from a backplane, and a display layer stacked on the polarizer, to improve a light mixing effect of the display and reduce a thickness of the display.

In a specific implementation, the display further includes a cover plate stacked on a side that is of the display and that is away from the polarizer, to protect the display layer.

According to a third aspect of the claimed invention, a mobile terminal is provided. The mobile terminal includes a frame and any one of the foregoing displays disposed on the frame, to improve a light mixing effect of the display of the mobile terminal and reduce a thickness of the display.

To facilitate understanding of a backlight module provided in the embodiments of this application, an application scenario of the backlight module is first described. The backlight module is applied to a display of a mobile terminal such as a mobile phone or a computer. The following describes in detail the embodiments of this application with reference to the accompanying drawings.

An embodiment of this application provides a backlight module. The backlight module mainly includes three parts based on functions. The three parts are: a backplane having a light reflecting surface, a light source layer disposed on the light reflecting surface, and at least one light mixing component disposed on the light source layer. The following separately describes the three parts in detail with reference to the accompanying drawings.

First, a backplane <NUM> is described with reference to <FIG>. The backplane <NUM> is a board structure. Specifically, the backplane <NUM> may be a printed circuit board, or may be a board structure disposed on a printed circuit board. Referring to <FIG>, the backplane <NUM> includes an upper surface and a lower surface that are opposite to each other (referring to the backlight module shown in <FIG>), where the upper surface of the backplane <NUM> is a light reflecting surface <NUM>. When the light reflecting surface <NUM> is disposed, the light reflecting surface <NUM> is a diffuse reflecting surface or a specular reflecting surface with a high reflectivity. The high reflectivity is specifically any value that is greater than <NUM> and less than <NUM>, such as <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, and <NUM>. When the light reflecting surface <NUM> is specifically disposed, a coating with a high reflectivity may cover a surface of the board structure, to form the light reflecting surface <NUM> that can reflect light on the surface of the board structure.

Then, a light source layer disposed on the light reflecting surface <NUM> of the backplane <NUM> is described. Still referring to <FIG>, a light source layer <NUM> is disposed on the light reflecting surface <NUM> of the backplane <NUM>, and the light source layer <NUM> has at least one point light source <NUM>. When the point light source <NUM> is specifically disposed, the point light source <NUM> may be a light emitting diode, or may be another point light source <NUM> that can emit light. In addition, light emitted by the point light source <NUM> is not limited to white light, and may also be light of another color such as blue light. When a quantity of point light sources <NUM> is determined, the quantity of point light sources <NUM> may be any value of at least one of <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, or the like. When there are a plurality of point light sources <NUM>, referring to <FIG> and <FIG>, an array of the plurality of point light sources <NUM> is arranged on the light reflecting surface <NUM> of the backplane <NUM>. It should be understood that an arrangement manner of the plurality of point light sources <NUM> is not limited to the disposing manner of the foregoing array arrangement, and another disposing manner may be used.

Referring to <FIG>, the light source layer <NUM> further has an encapsulating material for encapsulating the at least one point light source <NUM>. The encapsulating material may be silica gel, or may be another conventional encapsulating material that can transmit light, to protect the point light source <NUM>. In addition, the encapsulating material does not affect light ray output of the point light source <NUM>. In addition, when the point light source <NUM> is encapsulated to form the light source layer <NUM>, phosphor may be mixed into the encapsulating material, to change a color of light emitted by the point light source <NUM>. It should be understood that a disposing manner of the light source layer <NUM> is not limited to the foregoing disposing manner. In addition, another disposing manner may be used.

The following describes the light mixing component used to mix light of the point light source <NUM>. Referring to <FIG>, the at least one light mixing component is disposed on the light source layer <NUM>, and the at least one light mixing component is in a one-to-one correspondence with the at least one point light source <NUM>. Specifically, a quantity of light mixing components is equal to that of point light sources <NUM>, and each light mixing component corresponds to one point light source <NUM>. Each light mixing component is disposed in a region above a corresponding point light source <NUM> and a region between two adjacent point light sources <NUM>, to mix light of the point light sources <NUM>. Each light mixing component includes a light reflecting layer <NUM> configured to reflect some light rays emitted by a corresponding point light source <NUM>, and a light transmission layer <NUM> configured to transmit a light ray reflected by the light reflecting layer <NUM> and then reflected again by the light reflecting surface <NUM>. Specifically, referring to <FIG>, the light reflecting layer <NUM> is disposed right above the corresponding point light source <NUM> or in a region approximately right above the point light source <NUM>. The light transmission layer <NUM> is disposed in an edge region of the corresponding point light source <NUM>. To be specific, when there are a plurality of point light sources <NUM>, the light transmission layer <NUM> is disposed in a region between adjacent point light sources <NUM>. The light reflecting layer <NUM> is disposed above the light source layer <NUM> and is configured to reflect the some light rays emitted by the corresponding point light source <NUM>. The light reflecting layer <NUM> reflects the some light rays emitted by the point light source <NUM>, and the some light rays are reflected again by the light reflecting surface <NUM> on the backplane <NUM> and then emitted from the light transmission layer <NUM>. In this way, the light rays are more uniformly emitted from the backlight module. There are a plurality of specific manners of disposing the light reflecting layer <NUM> and the light transmission layer <NUM>. The following uses one point light source <NUM> and one light mixing component as an example for description with reference to the accompanying drawings.

Referring to <FIG>, the light reflecting layer <NUM> is disposed on a surface that is on the light source layer <NUM> and that is away from the backplane <NUM>. In this case, that is not according to the claims, the light transmission layer <NUM> is a part of the light source layer <NUM> that is not covered by the light reflecting layer <NUM>. During disposing, in an embodiment that is not according to the claims, the light reflecting layer <NUM> may be a conventional light reflecting board that can reflect light in the prior art, and the light reflecting board may be disposed on the light source layer <NUM> in a bonding manner. It should be understood that a disposing manner of the light reflecting layer <NUM> is not limited to the foregoing disposing manner of using the light reflecting board. In addition, another disposing manner may be used. For example, referring to <FIG>, in another embodiment that is not according to the claims, the light reflecting layer <NUM> may be a light reflecting coating covering the surface that is on the light source layer <NUM> and that is away from the backplane <NUM>, to facilitate disposing. A material of the light reflecting coating is a material that can reflect light and is easy to coat in the prior art. Referring to <FIG>, the light reflecting layer <NUM> is disposed in a region right above and a region diagonally above the corresponding point light source <NUM> (the backlight module shown in <FIG> is used as a reference), so that a coverage area of the light reflecting layer <NUM> is greater than that of the point light source <NUM>. Referring to <FIG>, a light input surface of the light reflecting layer <NUM> may be a plane parallel to or approximately parallel to the light reflecting surface <NUM>, to simplify disposing. Referring to <FIG>, in an embodiment that is not according to the claims, the light input surface of the light reflecting layer <NUM> may also be an arc-shaped surface that curves inwards. Specifically, a vertical distance between the light reflecting layer <NUM> and the light reflecting surface <NUM> gradually increases in a direction away from the point light source <NUM>, so that the light ray emitted by the point light source <NUM> is transmitted to a position that is away from the point light source <NUM> after being reflected by the light reflecting layer <NUM> and the light reflecting surface <NUM> for a plurality of times, and more light rays emitted by the point light source <NUM> are emitted from a region away from the point light source <NUM>, to improve a light mixing effect. It should be understood that a shape of the light reflecting surface <NUM> is not limited to the foregoing disposing manner, and another disposing manner may be used.

Referring to <FIG>, which shows a structure that is not according to the claims, the light reflecting layer <NUM> may be a complete structure without a through hole. Referring to <FIG>, in another embodiment that is not according to the claims, a through hole <NUM> that can transmit light is disposed on the light reflecting layer <NUM>. During specific disposing, as shown in <FIG>, two elliptic through holes <NUM> are disposed on the light reflecting layer <NUM>. As shown in <FIG>, one elliptic through hole <NUM> is disposed on the light reflecting layer <NUM>, and a center of the through hole <NUM> coincides with that of a corresponding point light source <NUM>. As shown in <FIG>, four circular through holes <NUM> are disposed on the light reflecting layer <NUM>, and the four circular through holes <NUM> surround the point light source <NUM>. It should be understood that a quantity of through holes <NUM> is not limited to that used in the foregoing disposing manner, and may be specifically any value of at least one of one, two, three, or the like. A shape of the through hole <NUM> is not limited to the foregoing elliptical or circular disposing manner. In addition, the shape of the through hole <NUM> may be any shape such as a triangle or a rectangle. When there is one through hole <NUM>, a disposing position of the through hole <NUM> is not limited to the foregoing disposing manner in which the center of the through hole <NUM> coincides with that of the point light source <NUM>, and the through hole <NUM> may be disposed at another position. When there are two or more through holes <NUM>, the disposing position of the through hole <NUM> is not limited to the foregoing disposing manner of surrounding the point light source <NUM>, and another arrangement manner may be alternatively used. For example, a plurality of through holes <NUM> are arranged on the light reflecting layer <NUM> in an unordered manner. The unordered manner is all manners that help uniformly emit a light ray. The through hole <NUM> is disposed on the light reflecting layer <NUM>, so that some light rays on the point light source <NUM> are emitted from the through hole <NUM>, thereby reducing light ray intensity above the point light source <NUM> and making the light ray intensity above the point light source <NUM> more uniform.

Referring to <FIG>, an embodiment that is not according to the claims, the light transmission layer <NUM> is a part of the light source layer <NUM>. To be specific, the light output surface of the light transmission layer <NUM> is a surface that is on the light source layer <NUM> and that is away from the backplane <NUM>, and the light input surface of the light transmission layer <NUM> is a surface that faces the backplane <NUM>. Referring to <FIG>, the light output surface of the light transmission layer <NUM> may be a plane, to simplify disposing. Referring to <FIG>, in another embodiment that is not according to the claims, the light output surface of the light transmission layer <NUM> may further be a convex or concave surface, that is, a vertical distance between the light output surface of the light transmission layer <NUM> and the light reflecting surface <NUM> of the backplane <NUM> gradually changes in a direction away from the point light source <NUM>, to form the convex or concave surface, so that a light ray is emitted from the light transmission layer <NUM>. In the foregoing disposing manner, the light transmission layer <NUM> can directly emit, from the light transmission layer <NUM>, the some light rays emitted by the point light source <NUM>. In addition, a light ray reflected by the light reflecting layer <NUM> is reflected by the light reflecting surface <NUM> and then emitted from the light transmission layer <NUM>. Intensity of an emitted light ray around the point light source <NUM> is improved, so that the light ray emitted by the point light source <NUM> is more uniformly emitted from the backlight module. It should be understood that disposing manners of the light input surface and the light output surface of the light transmission layer <NUM> is not limited to the foregoing disposing manners, and another disposing manner may be used.

Referring to <FIG>, which show embodiments that are not according to the claims, to enable a light ray to be more uniformly emitted from the light transmission layer <NUM>, a light diffusion structure <NUM> is disposed on at least one of the light input surface and the light output surface of the light transmission layer <NUM>. During specific disposing, referring to <FIG>, the light diffusion structure <NUM> is a concave-convex structure disposed on the light output surface of the light transmission layer <NUM>. The concave-convex structure may be a spherical protrusion disposed on the light output surface of the light transmission layer <NUM>, or may be a jagged concave-convex structure, so that the light rays are more uniformly emitted from the light transmission layer <NUM>. The light diffusion structure <NUM> is not limited to the foregoing disposing manner, and another conventional disposing manner that can help light diffusion in the prior art may be used. <FIG> only show that the light diffusion structure <NUM> is disposed on the light output surface of the light transmission layer <NUM>. It should be noted that, in addition to the foregoing disposing manner of disposing the light diffusion structure <NUM> on the light output surface of the light transmission layer <NUM>, the light diffusion structure <NUM> may be alternatively disposed on the light input surface of the light transmission layer <NUM>. In other words, the disposing manner of disposing the light diffusion structure <NUM> on at least one of the light input surface or the light output surface of the light transmission layer <NUM> falls within the protection scope of the embodiments of this application.

In addition, referring to <FIG>, scattering particles <NUM> may be further disposed in the light transmission layer <NUM>. The scattering particles <NUM> are specifically conventional scattering particles <NUM> that can help light ray scattering in the prior art. When the scattering particles <NUM> are specifically disposed, the scattering particles <NUM> may be disposed in the light transmission layer <NUM>. Specifically, all the scattering particles <NUM> may be arranged in the light transmission layer <NUM>. Alternatively, some scattering particles <NUM> may be embedded in the light transmission layer <NUM>, and some scattering particles <NUM> are exposed outside the light transmission layer <NUM>. The scattering particles <NUM> are disposed in the light transmission layer <NUM>, so that light output uniformity of the light transmission layer <NUM> can be improved.

Referring to <FIG>, in an embodiment that is not according to the claims, the light reflecting layer <NUM> is further encapsulated by a protective layer <NUM>, to protect the backlight module. During specific disposing, a material of the protective layer <NUM> is a light transmission material. Specifically, a silica gel material may be selected. During encapsulation, phosphor may be mixed into the protective layer <NUM>, to change a color of the light ray emitted by the point light source <NUM>.

In addition, referring to <FIG>, in another embodiment that is not according to the claims, at least one column <NUM> that can reflect light may be further disposed on the light reflecting layer <NUM> or the light transmission layer <NUM>, to form an air layer used for light mixing above the light transmission layer <NUM> and the light reflecting layer <NUM>. As shown in <FIG>, the column <NUM> may be disposed on the light reflecting layer <NUM>. The column <NUM> may be alternatively disposed on the light transmission layer <NUM>. For ease of disposing, the column <NUM> may be disposed on the light reflecting surface <NUM> of the backplane <NUM>, and one end of the column <NUM> is exposed outside the light transmission layer <NUM>. A material of the column <NUM> may be a conventional light transmission material in the prior art, to prevent the column <NUM> from affecting a light mixing effect. A surface of the column <NUM> may be coated with a material that can reflect light, to improve a light mixing effect. Referring to <FIG>, an area of a cross section of each column <NUM> gradually decreases in a direction away from the light reflecting surface <NUM>, that is, a lower end of the column <NUM> is larger and an upper end of the column <NUM> is smaller (refer to the backlight module shown in <FIG>). During specific disposing, the column <NUM> may be a cone structure, or may be a tapered prism structure. A structure with a larger lower end and a smaller upper end is used as the column <NUM>, to prevent the column <NUM> from affecting light mixing. When a quantity of columns <NUM> is determined, there may be one or two or more columns <NUM> in each light mixing component. When there are two or more columns <NUM>, the two or more columns <NUM> may be arranged around the point light source <NUM>. In a specific application, when a polarizer or another layer structure is stacked on the backlight module, because the column <NUM> supports the layer structure, an air layer that can be used for light mixing is provided above the light mixing component, thereby improving a light mixing effect. It should be understood that the foregoing shows only one disposing manner of the column <NUM>, and another disposing manner may be used.

The foregoing shows only the disposing manner of disposing the light reflecting layer <NUM> on the light source layer <NUM>. It should be understood that the light reflecting layer <NUM> is not limited to the disposing manner of directly disposing the light reflecting layer <NUM> on the light source layer <NUM>. For example, referring to <FIG>, which shows another embodiment that is not according to the claims, the backlight module further includes a substrate <NUM> that is disposed on the light source layer <NUM> and that can transmit light, and the light reflecting layer <NUM> is disposed on a surface that is on the substrate <NUM> and that is away from the light source layer <NUM>. In this case, the light transmission layer <NUM> is a part of the substrate <NUM> that is not covered by the light reflecting layer <NUM>. A material of the substrate <NUM> may be specifically PET (Polyethylene terephthalate, polyethylene terephthalate). During specific disposing, a disposing manner of the light reflecting layer <NUM> is basically the same as the foregoing disposing manner, except that a disposing position is different. Referring to <FIG>, the light reflecting layer <NUM> is disposed on a side that is of the substrate <NUM> and that is away from the light source layer <NUM>. A disposing manner of the light transmission layer <NUM> is basically the same as the foregoing disposing manner, except that composition of the light transmission layer <NUM> is different. Referring to <FIG>, the light transmission layer <NUM> is a part of the substrate <NUM> that is not covered by the light reflecting layer <NUM>. The light input surface of the light transmission layer <NUM> is a surface that is on the substrate <NUM> and that faces the light source layer <NUM>. The light output surface of the light transmission layer <NUM> is the surface that is on the substrate <NUM> and that is away from the light source layer <NUM>. As shown in <FIG>, the light diffusion structure <NUM> is disposed on both the light input surface and the light output surface of the light transmission layer <NUM>, to improve light ray output uniformity. During manufacturing, the light mixing component is first disposed on the substrate <NUM>, and then the substrate <NUM> is disposed on the light source layer <NUM>, to prevent a processing failure of the light mixing component from affecting reuse of the light source layer <NUM>, thereby improving an overall yield rate.

According to the claimed invention, a backlight layer and the light transmission layer <NUM> are disposed in another manner. Referring to <FIG>, which shows an embodiment of the claimed invention, the backlight module further includes a light guide layer <NUM> disposed on the at least one light mixing component. The light transmission layer <NUM> is a plurality of gluing layers disposed between the light guide layer <NUM> and the light source layer <NUM>, and the plurality of gluing layers are arranged at intervals to form an air layer between adjacent gluing layers. The light reflecting layer <NUM> is the air layer. Because a refraction angle of a light ray becomes smaller when the light ray is propagated from an optically denser medium to an optically thinner medium, total reflection of the light occurs, so that the some light rays emitted by the point light source <NUM> are reflected from the air layer. Because a difference between a density of the gluing layer and densities of the light source layer <NUM> and the light guide layer <NUM> is less than a difference between a density of air and the densities of the light source layer <NUM> and the light guide layer <NUM>, it is easier to emit a light ray from the gluing layer than to emit light from the air layer. In this way, the light reflected by the air layer is reflected by the light reflecting surface <NUM> on the backplane <NUM>, and then may be emitted by using the gluing layer, so that a light mixing effect can be improved by controlling a disposing position of the gluing layer.

Referring to <FIG>, the light reflecting layer <NUM> may be disposed in an upper region of each point light source <NUM>, or may be disposed in a region between two adjacent point light sources <NUM>. When the gluing layer is disposed, a material of the gluing layer is specifically a material that can transmit light in the prior art, for example, may be an OCA optically clear adhesive (Optically Clear Adhesive, which is a special adhesive used to bond a transparent optical element). There may be specifically at least <NUM>, such as <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, gluing layers. A shape of each gluing layer may be specifically a circle shown in <FIG>, or may be another shape such as an ellipse, a rectangle, or a triangle. The plurality of gluing layers may be arranged in an arrangement manner of an array shown in <FIG>, or may be arranged in another manner. Areas of all the plurality of gluing layers may be equal or not equal. Referring to <FIG>, an area of each of the plurality of gluing layers gradually increases from a position close to the corresponding point light source <NUM> to a position that is away from the corresponding point light source <NUM>, so that more light rays are emitted from an edge region of the point light source <NUM>, thereby improving a light mixing effect. It should be understood that the foregoing shows only several disposing manners of the gluing layer, and another disposing manner may be used.

To improve a light mixing effect of the light transmission layer <NUM>, when the gluing layer is the light transmission layer <NUM>, the light diffusion structure <NUM> may be disposed on a surface that is on the gluing layer and that is bonded to the light guide layer <NUM>. Alternatively, the light diffusion structure <NUM> may be disposed on a surface that is on the gluing layer and that is bonded to the light source layer <NUM>. To be specific, the manner of disposing the light diffusion structure <NUM> on either or both of the surface that is on the gluing layer and that is bonded to the light guide layer <NUM> or the surface that is on the gluing layer and that is bonded to the light source layer <NUM> falls within the protection scope of this embodiment of this application. The light diffusion structure <NUM> is disposed on the gluing layer, to improve a light mixing effect. The scattering particles <NUM> may be further disposed in the gluing layer. During specific processing, the scattering particles <NUM> may be doped into a gluing material, to improve a light mixing effect.

When the light guide layer <NUM> is disposed, referring to <FIG>, the light guide layer <NUM> includes a prism film <NUM> bonded to a plurality of gluing layers and a diffusion film <NUM> disposed on the prism film <NUM>. There may be one prism film <NUM>, or there may be two or more prism films <NUM>. When there are two prism films <NUM>, the two prism films <NUM> are stacked together in different directions. Prisms on the two prism films <NUM> may be extended in a perpendicular manner, to improve a brightness enhancement effect. Referring to <FIG>, one layer of diffusion film <NUM> is disposed on the prism film <NUM>, and the diffusion film <NUM> is a conventional film that can perform light diffusion in the prior art. Still referring to <FIG>, a plurality of gluing layers are also disposed between the prism film <NUM> and the diffusion film <NUM>, to improve a light mixing effect. Two layers of prism films <NUM> that extend in perpendicular directions may be further disposed on the diffusion film <NUM>, to improve brightness of a light ray emitted by the backlight module.

The light reflecting layer <NUM> is disposed above the light source layer <NUM> and is configured to reflect the some light rays emitted by the corresponding point light source <NUM>. The light reflecting layer <NUM> reflects the some light rays emitted by the point light source <NUM>, and the light rays are reflected again by the light reflecting surface <NUM> on the backplane <NUM> and then emitted from the light transmission layer <NUM>. In this way, the light rays are more uniformly emitted from the backlight module, and a light mixture distance of a backlight structure is reduced.

In addition, this application further provides a display. The display, according to the claimed invention, includes any one of the foregoing backlight modules, that are according to the claimed invention, a polarizer stacked on a side that is of the backlight module and that is away from a backplane, and a display layer stacked on the polarizer, to improve a light mixing effect of the display and reduce a thickness of the display. The display further includes a cover plate stacked on a side that is on the display and that is away from the polarizer, to protect the display layer.

In addition, this application further provides a mobile terminal. The mobile terminal includes a frame and any one of the foregoing displays disposed on the frame, to improve a light mixing effect of the display of the mobile terminal and reduce a thickness of the display.

Claim 1:
A backlight module, comprising:
a backplane (<NUM>) having a light reflecting surface (<NUM>);
a light source layer (<NUM>) disposed on the light reflecting surface (<NUM>), wherein the light source layer (<NUM>) has at least one point light source (<NUM>);
a light mixing component disposed on the light source layer (<NUM>) in a one-to-one correspondence with the at least one point light source (<NUM>); and
a light guide layer disposed on the at least one light mixing component, wherein
each light mixing component comprises a light reflecting layer (<NUM>) configured to reflect some light rays emitted by a corresponding point light source (<NUM>), and a light transmission layer (<NUM>) configured to transmit a light ray reflected by the light reflecting layer (<NUM>) and then reflected again by the light reflecting surface (<NUM>),
wherein a light diffusion structure (<NUM>) is disposed on at least one of a light input surface and a light output surface of the light transmission layer (<NUM>),
wherein the light diffusion structure (<NUM>) is a concave-convex structure disposed on the light input surface or the light output surface, and
wherein the light transmission layer (<NUM>) is a plurality of gluing layers disposed between the light guide layer and the light source layer (<NUM>), and the plurality of gluing layers are arranged at intervals in a direction parallel to the plane of the backlight module to form an air layer between adjacent gluing layers; and the light reflecting layer (<NUM>) is the air layer.