CN111552119A

CN111552119A - Lens film, light source assembly, backlight module and display device

Info

Publication number: CN111552119A
Application number: CN202010491768.9A
Authority: CN
Inventors: 刘欣; 尤君平; 邹文聪; 王博; 王玉年
Original assignee: Shenzhen Skyworth RGB Electronics Co Ltd
Current assignee: Shenzhen Skyworth RGB Electronics Co Ltd
Priority date: 2020-06-02
Filing date: 2020-06-02
Publication date: 2020-08-18

Abstract

The application provides a pair of lens membrane, light source subassembly, backlight unit and display device, the lens membrane has special shape design, can adjust the angle that the light source sent light. From this, be favorable to increasing the light-emitting angle of light source subassembly for emergent ray is more even, thereby can shorten the mixed light distance among the backlight unit, is favorable to display device's narrow frame design.

Description

Lens film, light source assembly, backlight module and display device

Technical Field

The application relates to the technical field of display, in particular to a lens film, a light source assembly, a backlight module and display equipment.

Background

With the gradual development of computer monitors, tablet computers, smart televisions and other display devices toward being lighter, thinner and better in image quality, many novel display technologies are produced. Among them, Light Emitting diodes (MINILEDs) are popular as a new generation display technology due to their advantages of small size, thin thickness, high brightness, millimeter-scale pixel division, high-precision dynamic backlight effect, etc.

However, the conventional light emitting diode has a small light emitting angle, and mainly emits light through the front surface of the light emitting diode, so that only a very small amount of light is emitted from the side surface of the light emitting diode.

Disclosure of Invention

The application provides a lens membrane, light source subassembly, backlight unit and display device, and its aim at overcomes prior art, and because the backlight unit that led to of emitting diode's luminescent property presents the problem of bright dark space for the light that sends through the lens membrane is more even, and the imaging effect peak is better.

In order to solve the above problems, the present application provides:

a lens film, comprising:

the lens film comprises a plurality of lens structures, and two adjacent lens structures are connected through a fixing part;

the lens structure comprises an accommodating cavity, the cross section of the accommodating cavity is in a bullet shape in the vertical direction, and a light incident surface is formed on the inner wall of the accommodating cavity;

a light-emitting surface is formed on one side, opposite to the light-in surface, of the lens structure, and comprises a first light-emitting surface and two second light-emitting surfaces, wherein the first light-emitting surface is vertically positioned above the accommodating cavity and is formed by sinking towards the accommodating cavity;

the two second light-emitting surfaces are respectively arranged on two sides of the first light-emitting surface and connected with the first light-emitting surface, and the second light-emitting surfaces are convex surfaces.

Further, the lens film comprises a first surface and a second surface opposite to the first surface, and the first surface is recessed towards one side of the second surface to form the containing cavity.

Furthermore, the second surface is protruded on one side deviating from the first surface to form the light emitting surface.

Furthermore, the light incident surface comprises two light incident sub-surfaces, and the two light incident sub-surfaces are arranged in axial symmetry with the central axis of the accommodating cavity in the vertical direction;

in the vertical direction, the curvature radius of a first light incident point on the light incident sub-surface is larger than the curvature radius of a second light incident point on the light incident sub-surface, wherein the second light incident point is located between the first light incident point and an end point, close to the second surface, on the light incident sub-surface.

Further, in the vertical direction, a distance between a light exit point on the second light exit surface close to the first surface and a corresponding light entrance point on the light entrance sub-surface is greater than a distance between a light exit point on the second light exit surface close to the second surface and a corresponding light entrance point on the light entrance sub-surface.

Furthermore, the lens structure further comprises a plurality of salient points, and the salient points are arranged on the light emitting surface.

Further, in the vertical direction, a distance between two adjacent convex points on the second light emitting surface in the direction close to the first surface is greater than a distance between two adjacent convex points on the second light emitting surface in the direction close to the second surface.

The present application also provides a light source assembly comprising a plurality of light sources, a base member and the lens film described above;

arranging one light source in each accommodating cavity of the lens film respectively;

the lens film is fixedly arranged on the base member through a fixing portion.

The application also provides a backlight module which comprises the light source components.

The application also provides a display device which comprises the backlight module.

The beneficial effect of this application is: the application provides a lens film, a light source component, a backlight module and display equipment, wherein the lens film comprises a plurality of lens structures, and two adjacent lens structures are connected through a fixing part; the lens structure comprises an accommodating cavity, the cross section of the accommodating cavity is in a bullet shape in the vertical direction, the light source is accommodated in the accommodating cavity, and a light incident surface is formed on the inner wall of the accommodating cavity; a light-emitting surface is formed on one side, opposite to the light-in surface, of the lens structure, and comprises a first light-emitting surface and two second light-emitting surfaces, wherein the first light-emitting surface is vertically positioned above the accommodating cavity and is formed by sinking towards the accommodating cavity; the two second light-emitting surfaces are respectively arranged on two sides of the first light-emitting surface and connected with the first light-emitting surface, and the second light-emitting surfaces are convex surfaces. In this application, can adjust the angle that the light source sent light, be favorable to increasing the light-emitting angle of light source subassembly for emergent light is more even, thereby can shorten the mixed light distance among the backlight unit, is favorable to display device's narrow frame design.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.

FIG. 1 is a cross-sectional view of a backlight module in the prior art;

FIG. 2 is a diagram illustrating a distribution of luminous intensity of a prior art LED;

FIG. 3 illustrates a display device provided for one embodiment of the present application;

FIG. 4 shows a cross-sectional view of the backlight module shown in FIG. 3;

FIG. 5 illustrates a lens structure in a lens film provided by an embodiment of the present application;

FIG. 6 shows a light path diagram of light through a lens structure in the present application;

fig. 7 illustrates another lens structure provided in another embodiment of the present application.

Description of the main element symbols:

10-a display device; 100-a backlight module; 200-a display module;

110-a light source assembly; 120-a diffuser plate; 130-a membrane; 140-a back plate;

111-a light source; 112-a lens film; 112 a-a first side; 112 b-a second face; 112 c-a receiving cavity;

1121-lens structure; 11211-incident surface; 11211 a-first light-in spot; 11211 b-second light-in spot;

11212-a light-emitting surface; 112121-a first light emitting surface; 112122-a second light emitting surface;

1122-a fixation section; 113-a base member;

114-bumps.

Detailed Description

Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application.

In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present application.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

Referring to fig. 1 and 2, fig. 1 is a cross-sectional view of a backlight module in the prior art, and fig. 2 is a schematic diagram of a light-emitting intensity distribution of a light-emitting diode in the prior art. As shown in fig. 1 and 2, the conventional leds emit light substantially in the front direction, emit light substantially in the dark in the side direction, and have a light-emitting angle of about 120 degrees, so that the light energy between the leds of the backlight module is relatively small, and dark regions are generated between the leds.

In order to overcome the defect of dark areas among the leds in the prior art, the leds are usually densely arranged, that is, a large number of leds need to be arranged on a circuit board of the backlight module, and for example, a 65-inch backlight module needs about one hundred thousand leds. Therefore, the cost for manufacturing the backlight module is increased, the power consumption is increased, and more heat is generated during operation, which affects the normal operation of the backlight module.

In addition, referring to fig. 1, in order to make the emergent light more uniform, theoretically, the light mixing distance in the backlight module may be lengthened to provide a larger light mixing space for the light, but the problem caused by this is that the thickness of the backlight module is increased, so that the thickness of the whole display device is increased, and the current requirements for lighter and thinner display devices cannot be met.

In the lens membrane, light source subassembly, backlight unit and display device that this application provided, wherein, this lens membrane has special shape design, can adjust the angle that the light source sent light. From this, be favorable to increasing the light-emitting angle of light source subassembly for emergent ray is more even, thereby can shorten the mixed light distance among the backlight unit, is favorable to display device's narrow frame design. The display equipment provided by the application can be flat display products such as mobile phones, televisions, computers and the like.

Referring to fig. 3, fig. 3 is a display device according to an embodiment of the present disclosure.

The display device 10 includes a backlight module 100 and a display module 200, wherein the backlight module 100 is used for providing backlight for displaying images for the display module 200.

For example, the display module 200 may be a liquid crystal display module, and specifically, may include a mechanism of a conventional liquid crystal display module, such as but not limited to an array substrate, a color filter substrate disposed opposite to the array substrate, a liquid crystal layer disposed between the array substrate and the color filter substrate, and a polarizer.

Referring to fig. 4, fig. 4 is a cross-sectional view of the backlight module shown in fig. 3.

As shown in fig. 4, the backlight module 100 provided by the embodiment of the present disclosure includes a light source assembly 110, a diffusion plate 120, a film 130, and a back plate 140.

In this application, backlight unit 100 is straight following formula backlight unit (Bottom lighting), and for the backlight unit of other forms, straight following formula backlight unit can reach bigger size, has satisfied the higher requirement to display brightness to and have better light-emitting visual angle, higher light utilization efficiency.

The light source assembly 110 is disposed on the back plate 140, and the diffusion plate 120 and the film 130 are stacked on the back plate 140, wherein the film 130 is disposed closely above the diffusion plate 120, and the light source assembly 110 is located between the back plate 140 and the diffusion plate 120.

In addition, a light mixing space exists between the light source assembly 110 and the diffusion plate 120, and a vertical distance between the light source assembly 110 and the diffusion plate 120 is referred to as a light mixing distance, and the light mixing space is used for providing a light mixing space for the backlight emitted by the light source assembly 110, so that the backlight can be mixed, and the light reaching the diffusion plate 120 is more uniform. Generally, on the premise of ensuring the uniformity of the display image, the light mixing distance is shortened, resulting in the backlight module 100 being thinner, so that the display device is made thinner and thinner, and therefore, the thickness of the backlight module 100 can be affected by reasonably controlling the light mixing distance, thereby affecting the overall thickness of the display device 10.

Specifically, the diffusion plate 120 is used for diffusing the backlight emitted from the light source assembly 110, so that the backlight is uniformly distributed for display. The Diffuser 120, also called Diffuser (Diffuser), is one of the important components of the backlight module 100, and mainly functions to provide a uniform surface light source for the display module 200. The conventional diffuser 120 generally functions according to the following principle: the diffusion plate is formed by adding a particle of chemical particles to a base material of the diffusion plate, the base material is usually made of a material with high light transmittance, such as thermoplastic Polyester (PET), Polycarbonate (PC), polymethyl methacrylate (PMMA), etc., and the scattering particles are dispersed in the diffusion plate 120, so that light continuously passes through media with different refractive indexes when passing through the diffusion plate 120, and thus the light is refracted, reflected, and scattered many times, thereby forming an optical diffusion effect.

Specifically, the film 130 is used to enhance the brightness of the backlight emitted from the diffusion plate 120. At a certain light source output, the front brightness, or axial brightness, of the liquid crystal module is improved by the film 130, and the film 130 includes, but is not limited to, a prism film, a reflective polarizer, a high-reflectivity reflector, and the like. In addition, the backlight module 100 further includes the light source assembly 110 for emitting backlight, and the light source assembly 110 is an indispensable part of the backlight module 100.

In addition, in a backlight module 100, there may be one or more light source modules 110. Preferably, a plurality of light source assemblies 110 are arranged in the backlight module 100, and the plurality of light source assemblies 110 are arranged in a matrix, so that the preparation of one light source assembly is relatively simple, and the subsequent transportation process is convenient.

Referring to fig. 4, a cross-sectional view of the backlight module 100 includes a light source assembly 110, and the light source assembly 110 includes a plurality of light sources 111, a lens film 112 and a base member 113. The light sources 111 are respectively disposed in each receiving cavity 112c of the lens film 112, and the lens film 112 is fixedly disposed on the base member 113 through the fixing portion 1122.

The Light source 111 may be a Light Emitting Diode (LED), a Mini Light Emitting Diode (Mini LED), or an organic Light Emitting semiconductor (OLED). In the present application, it is preferable to select a mini led, and reduce the volume of the light source 111 on the premise of ensuring the brightness of the display light, so as to reduce the volume of the backlight module 100 and the display device 10.

Referring to fig. 4, the lens film 112 is fixed on the base 113 through the fixing portion 1122, and is usually bonded between the fixing portion 1122 of the lens film 112 and the base 113 by an optical adhesive, so as to fix the lens film 112, thereby forming a complete light source assembly 110, which is convenient for manufacturing and later application processes. In this embodiment, the assembled light source assembly 110 can be used as an integrated product to be produced, and in practical application, only the light source assembly 110 needs to be directly assembled with other devices included in the backlight module 100 or the display module 200, which is beneficial to simplifying the production process in practical application and improving the production efficiency.

Referring to fig. 5, fig. 5 is a schematic diagram illustrating a lens structure in a lens film according to an embodiment of the present disclosure.

The lens film 112 may be made of epoxy or silicone.

The lens film 112 includes a first surface 112a and a second surface 112b opposite to the first surface 112a, and the first surface 112a is recessed toward the second surface 112b to form the receiving cavity 112 c.

The lens film 112 includes a plurality of lens structures 1121 and a fixing portion 1122.

Referring to fig. 6, fig. 6 is a light path diagram of light passing through the lens structure. A lens structure provided in an embodiment of the present application is described in detail below with reference to fig. 6.

For each lens structure 1121 on the lens film 112, the lens structure 1121 includes a receiving cavity 112c, the cross section of the receiving cavity 112c is in a bullet shape in the vertical direction, the light source 111 is received in the receiving cavity 112c, and the light incident surface 11211 is formed on the inner wall of the receiving cavity 112c, so that the light intensity distribution of the light source 111 reaching the light incident surface 11211 can be changed, thereby reducing the light intensity in the vertical direction and increasing the light intensity in the lateral direction.

Specifically, the light incident surface 11211 includes two light incident sub-surfaces, and the two light incident sub-surfaces are disposed in axial symmetry with a central axis of the accommodating cavity 112c in the vertical direction, so that the two light incident sub-surfaces can achieve the same effect.

Specifically, in the vertical direction, a radius of curvature at a first light incident point 11211a on the light incident sub-surface is larger than a radius of curvature at a second light incident point 11211b on the light incident sub-surface, where the second light incident point 11211b is located between the first light incident point 11211a and an end point, close to the second surface 112b, on the light incident sub-surface. Due to the fact that the special curvature radius of the sub light incidence surface is arranged, the incidence angle of the light can be controlled, the deflection direction and the emergent angle of the light are controlled, and the light can be uniformly emitted. Particularly, through the structure, the incident light in the vertical direction is reduced, and the incident light in the side direction is increased, so that the light distribution is changed at the incident end, and the control process of the subsequent corresponding light deflection is facilitated.

Meanwhile, a light-emitting surface 11212 is formed on the side of the lens structure 1121 opposite to the light-incident surface 11211, wherein the light-emitting surface 11212 is formed by the second surface 112b protruding toward the side away from the first surface 112 a.

The light emitting surface 11212 includes a first light emitting surface 112121 and two second light emitting surfaces 112122, and the first light emitting surface 112121 is vertically above the receiving cavity 112c and is formed by being recessed toward the receiving cavity 112 c. Here, a concave lens-like structure is formed between the first light emitting surface 112121 and the inner wall of the corresponding position of the receiving cavity 112c, so that the light rays concentrated in the vertical direction are diverged, and the light rays are more uniform.

The two second light-emitting surfaces 112122 are disposed on two sides of the first light-emitting surface 112121 and connected to the first light-emitting surface 112121, respectively, and the second light-emitting surface 112122 is a convex surface. The second light emitting surface 112122 may be in the shape of an arc with a predetermined central angle, but is not limited to the shape of an arc with the same radius for each central angle, and may also be different radii for each central angle. The purpose of changing the deflection angle of the corresponding light is achieved by the special shape of the second light emitting surface 112122, so that the light can be emitted in a wider angle range.

In the vertical direction, a distance between a light exit point on the second light exit surface 112122 near the first surface 112a and a corresponding light entrance point on the light entrance sub-surface is greater than a distance between a light exit point on the second light exit surface 112122 near the second surface 112b and a corresponding light entrance point on the light entrance sub-surface, so as to change the offset angle of the corresponding light.

The light source subassembly that provides in this application can adjust the light angle that the light source sent, is favorable to increasing the light-emitting angle of light source subassembly for emergent light is more even, thereby can shorten the mixed light distance among the backlight unit, is favorable to display device's narrow frame design.

Referring to fig. 7, fig. 7 is another lens structure according to another embodiment of the present application.

The lens structure 1121 includes an accommodating cavity 112c, a cross section of the accommodating cavity 112c is in a bullet shape in a vertical direction, the light source 111 is accommodated in the accommodating cavity 112c, and a light incident surface 11211 is formed on an inner wall of the accommodating cavity 112 c. Specifically, the light incident surface 11211 includes two light incident sub-surfaces, and the two light incident sub-surfaces are disposed in axial symmetry with a central axis of the accommodating cavity 112c in the vertical direction. In the vertical direction, the radius of curvature of the first light incident surface 11211a is greater than the radius of curvature of the second light incident surface 11211b, where the second light incident surface 11211b is located between the first light incident point 11211a and an end point of the light incident surface close to the second surface 112 b.

Meanwhile, a light-emitting surface 11212 is formed on the side of the lens structure 1121 opposite to the light-entering surface 11211, wherein the light-emitting surface 11212 is formed by protruding the side of the second surface facing away from the first surface 112 a. The light emitting surface 11212 includes a first light emitting surface 112121 and two second light emitting surfaces 112122, and the first light emitting surface 112121 is vertically above the receiving cavity 112c and is formed by being recessed toward the receiving cavity 112 c. The two second light-emitting surfaces 112122 are disposed on two sides 112121 of the first light-emitting surface and connected to the first light-emitting surface 112121, respectively, and the second light-emitting surface 112122 is a convex surface.

In the vertical direction, a distance between a light exit point on the second light exit surface 112122 near the first surface 112a and a corresponding light entrance point on the light entrance sub-surface is greater than a distance between a light exit point on the second light exit surface 112122 near the second surface 112b and a corresponding light entrance point on the light entrance sub-surface.

In this embodiment, in order to make the light emitted more uniform, the lens structure 1121 further includes a plurality of protruding points 114, and the protruding points 114 are disposed on the light emitting surface 11212, wherein the protruding points 114 are used for further diverging the light emitted from the light emitting surface 11212.

Specifically, the distance between two adjacent bumps 114 on the second light emitting surface 112122 in the direction close to the first surface is greater than the distance between two adjacent bumps 114 on the second light emitting surface 112122 in the direction close to the second surface, so that the light can be further diffused according to the emitting angles of different light, the number of the bumps 114 is reduced, and the manufacturing cost is reduced.

In this embodiment, the assembled light source assembly 110 can be used as an integrated product to be produced, and in practical application, only the light source assembly 110 needs to be directly assembled with other devices included in the backlight module 100 or the display module 200, which is beneficial to simplifying the production process in practical application and improving the production efficiency.

In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.

Claims

1. The lens film is characterized by comprising a plurality of lens structures, wherein two adjacent lens structures are connected through a fixing part;

2. The lens film of claim 1, comprising a first surface and a second surface opposite to the first surface, wherein the first surface is recessed to form the receiving cavity.

3. The lens film as claimed in claim 2, wherein the second surface is formed with the light-emitting surface protruding from a side facing away from the first surface.

4. The lens film of claim 2, wherein the light incident surface includes two light incident sub-surfaces, and the two light incident sub-surfaces are axially symmetric about a central axis of the accommodating cavity in a vertical direction;

5. The lens film of claim 4, wherein, in the vertical direction, a distance between a light exit point on the second light exit surface near the first surface and a corresponding light entrance point on the light entrance sub-surface is greater than a distance between a light exit point on the second light exit surface near the second surface and a corresponding light entrance point on the light entrance sub-surface.

6. The lens film of claim 1, wherein the lens structure further comprises a plurality of bumps disposed on the light-emitting surface.

7. The lens film of claim 6, wherein a distance between two adjacent convex points on the second light emitting surface in a direction close to the first surface is greater than a distance between two adjacent convex points on the second light emitting surface in a direction close to the second surface in the vertical direction.

8. A light source module comprising a plurality of light sources, a base member, and a lens film as claimed in any one of claims 1 to 7;

the lens film is fixedly arranged on the base member through a fixing portion.

9. A backlight module, comprising a plurality of light source modules as claimed in claim 8.

10. A display device comprising the backlight module according to claim 9.