CN110208987A - Down straight aphototropism mode set and display - Google Patents

Abstract

The present invention discloses a kind of down straight aphototropism mode set and display, the down straight aphototropism mode set includes backboard and the liquid crystal display panel that is mounted on backboard, cavity is formed between the liquid crystal display panel and the backboard, it further include multiple light guiding films, multiple light guiding films are placed in the cavity, and multiple light guiding film arranged for interval and it is covered in the backboard, light source component is provided between two light guiding films of arbitrary neighborhood；The light guiding film is formed with incidence surface towards the side of the light source component, the light guiding film is formed with light-emitting surface towards the side of the liquid crystal display panel, the light that the light source component issues is injected in the light guiding film by the incidence surface, and is projected from the light-emitting surface to liquid crystal display panel after the light guiding film diffusing reflection.The light that the present invention enables to light source component to issue equably is projected to liquid crystal display panel, so that the display effect of liquid crystal display panel is more bright, uniform.

Description

Direct type backlight module and display

technical field

The invention relates to the field of display technology, in particular to a direct-lit backlight module and a display.

Background technique

With the wide application of liquid crystal display technology, people have put forward higher requirements on the display effect of the display. However, the liquid crystal panel itself does not have the characteristic of emitting light, so a backlight module needs to be used to provide a light source.

In a traditional direct-lit backlight module, the light source unit is arranged on the bottom plane of the backplane, and the light is projected to the diffuser plate on the inner wall of the liquid crystal panel through the lens of the light source unit cover to provide the light source. However, the light projected through the lens is not uniformly distributed on the diffuser plate, which tends to produce obvious bright and dark boundaries. And it is also necessary to set a bracket in the cavity formed by the back plate and the liquid crystal panel to fix the diffusion plate on the inner wall of the liquid crystal panel, and the bracket in the cavity will also affect the propagation of light in the cavity of the back plate to further generate uneven brightness and darkness. At the same time, since the side wall of the back panel is arranged at an oblique angle to the diffusion plate, light is not easily reflected by the reflection sheet to reach the corners of the diffusion plate, and vignetting is easily formed at the corners of the diffusion plate, which affects the display effect.

Contents of the invention

The main purpose of the present invention is to provide a direct-lit backlight module and a display to solve the problem that the light projected by the backlight module through the lens is not uniform, resulting in bright and dark areas, thereby affecting the display effect.

In order to achieve the above object, the direct-type backlight module proposed by the present invention includes a backplane and a liquid crystal panel installed on the backplane, a cavity is formed between the liquid crystal panel and the backplane, and the direct-type backlight module Also includes:

A plurality of light guide films, a plurality of the light guide films are accommodated in the cavity, and a plurality of the light guide films are arranged at intervals and cover the back plate, and any two adjacent light guide films A light source is arranged between them;

A light incident surface is formed on the side of the light guide film facing the light source element, a light exit surface is formed on the side of the light guide film facing the liquid crystal panel, and the light emitted by the light source element passes through the light incident surface It enters into the light guide film, and after being diffusely reflected by the light guide film, it is emitted from the light exit surface to the liquid crystal panel.

Preferably, a reflective sheet is pasted on the side of the light guide film facing the back plate, a diffusion layer is provided on the side of the light guide film facing the liquid crystal panel, and the light emitting surface is formed on the diffusion layer .

Preferably, a plurality of convex dots are formed in the light guide film on a side close to the reflective sheet, the plurality of convex dots are arranged at intervals, and a reflective film is provided on the outer surface of the convex dots.

Preferably, a plurality of said dots are staggered.

Preferably, the diffusion layer is evenly coated with diffusion particles.

Preferably, the direct-type backlight module further includes a cooling frame installed on the backplane, and the light source element is installed on the cooling frame.

Preferably, the heat dissipation frame includes a first heat dissipation strip attached to the back plate and a second heat dissipation strip vertically installed on the first heat dissipation strip, and the two sides of the second heat dissipation strip are installed with the Light source parts.

Preferably, the light incident surface is disposed opposite to the light source element, and the height of the light incident surface is greater than or equal to the height of the light source element.

Preferably, a spacer is provided on the back plate close to the light source element, and the light guide film is installed on the back plate through the spacer, so that the light incident surface and the light source element Right on set.

The present invention also proposes a display, which includes the above-mentioned direct-lit backlight module.

In the technical solution of the present invention, a plurality of light guide films are arranged in the cavity formed by the back plate and the liquid crystal panel, and light-emitting light source parts are arranged between adjacent light guide films, and the light emitted by the light source parts passes through the light guide film After entering the light guide film, it propagates through reflection in the light guide film, and emits from the light exit surface of the light guide film to the liquid crystal panel to form a backlight. The light emitted by the light source can be reflected and transmitted in the light guide film, and can be evenly emitted to the liquid crystal panel on the light-emitting surface, so that the liquid crystal panel is irradiated by uniform light, making the display effect brighter and more uniform, and can also reduce noise. The number of parts in the group reduces production costs.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained according to the structures shown in these drawings without creative effort.

Fig. 1 is a side sectional view of an embodiment of the direct type backlight module of the present invention;

2 is a partial structural sectional view of an embodiment of the direct type backlight module of the present invention;

Fig. 3 is a schematic diagram of the arrangement of convex dots of an embodiment of the direct type backlight module of the present invention;

FIG. 4 is a density design curve of convex dots of an embodiment of the direct type backlight module of the present invention.

Explanation of reference numbers:

label name label name 10 backplane 20 LCD panel 30 Light guide film 31 Light incident surface 32 light emitting surface 33 A reflective sheet 34 Diffusion layer 341 Diffused particles 35 Convex dot 40 Light source 50 cooling rack 51 first cooling strip 52 second cooling strip 53 block

The realization of the purpose of the present invention, functional characteristics and advantages will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relationship between the components in a certain posture (as shown in the accompanying drawings). Relative positional relationship, movement conditions, etc., if the specific posture changes, the directional indication will also change accordingly.

In addition, in the present invention, descriptions such as "first", "second" and so on are used for description purposes only, and should not be understood as indicating or implying their relative importance or implicitly indicating the quantity of indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

In the present invention, unless otherwise specified and limited, the terms "connection" and "fixation" should be understood in a broad sense, for example, "fixation" can be a fixed connection, a detachable connection, or an integral body; It can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediary, and it can be an internal communication between two elements or an interaction relationship between two elements, unless otherwise clearly defined. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

In addition, the technical solutions of the various embodiments of the present invention can be combined with each other, but it must be based on the realization of those skilled in the art. When the combination of technical solutions is contradictory or cannot be realized, it should be considered as a combination of technical solutions. Does not exist, nor is it within the scope of protection required by the present invention.

The invention proposes a direct type backlight module to solve the problem of uneven projection of light from the backlight module.

As shown in FIG. 1 , a direct-lit backlight module proposed in an embodiment of the present invention includes a backplane 10 and a liquid crystal panel 20 . The liquid crystal panel 20 is mounted on the backplane 10 and forms a cavity with the backplane 10 . The direct-type backlight module also includes a plurality of light guide films 30, and the plurality of light guide films 30 are accommodated in the cavity formed by the liquid crystal panel 20 and the back plate 10, and the plurality of light guide films 30 are arranged at intervals and cover the back panel. On the board 10 , a light source element 40 capable of emitting light is disposed at a gap between any adjacent light guide films 30 . The side of the light guide film 30 facing the light source part 40 is formed with a light incident surface 31, and the light emitted by the light source part 40 enters the light guide film 30 through the light incident surface 31, and the light guide film 30 is formed on the side facing the liquid crystal panel 20 There is a light exit surface 32 through which the light in the light guide film 30 can be emitted. The light emitted by the light source 40 enters the light guide film 30 through the light incident surface 31 , and the light can be emitted from the light exit surface 32 to the liquid crystal panel 20 after being diffusely reflected in different directions in the light guide film 30 .

In the technical solution of the present invention, the light source element 40 is arranged between two light guide films 30, and the light emitted by the light source element 40 can be incident through the light incident surface 31 of the light guide film 30, and is different in the light guide film 30. After the reflection in the direction propagates, it is emitted from the light-emitting surface 32 of the light guide film 30 to the liquid crystal panel 20, so that the light emitted by the light source element 40 can be uniformly projected on the liquid crystal panel 20 after the light propagates through the light guide film 30 , so that the liquid crystal panel 20 can receive the light emitted by the light source element 40 no matter the center or the corner, and make the display effect brighter and more uniform. The diffuse reflection of light in the light guide film 30 can be realized through the light source part 40 and the light guide film 30 arranged relative to the light source part 40, and then the light is projected from the light guide film 30 to the liquid crystal panel 20 to realize the backlight projection of the liquid crystal display, reducing The number of light source elements 40 required by the direct-lit backlight module is reduced, the module design is simplified, and the production cost is reduced. And because the light guide film 30 does not need to be connected with the backplane 10, the backplane 10 can be ultra-thin, save the space occupied by the backplane 10, and reduce the weight of the backplane 10, thereby reducing the quality of the entire direct-type backlight module .

It should be noted that the number of light guide films 30 in the direct type backlight module can be set to two, and the two light guide films 30 are arranged to cover the backplane 10, and a light source element is arranged between the two light guide films 30 40 , the light source element 40 can respectively emit light toward the light incident surfaces 31 of the two light guide films 30 . Wherein, the light source element 40 can be a bar-shaped light source element 40, which is arranged on the center line of the back plate 10, that is, the light source element 40 can pass through the center point of the back plate 10 and be parallel to the long side of the back plate 10, or can be arranged so as to cross the center line of the back plate 10. The center point of the board 10 is parallel to the broad side of the backplane 10 , and the light guide film 30 is arranged on both sides of the light source element 40 in two different arrangements of the light source element 40 .

Further, referring to FIG. 1 and FIG. 2 , a reflection sheet 33 is pasted on the side of the light guide film 30 facing the back plate 10, and a diffusion layer 34 is provided on the side of the light guide film 30 facing the liquid crystal panel 20, and the diffusion layer 34 is formed with The light emitting surface 32 of the light guide film 30 . The light emitted by the light source element 40 can be directed to the side of the light guide film 30 facing the backplane 10 after entering the light guide film 30 through the light incident surface 31. Since the material of the light guide film 30 has a corresponding refractive index, when the light enters When the incident angle of the light guide film 30 facing the side of the back plate 10 is smaller than the critical angle corresponding to the refractive index, the light will be refracted so as to be emitted from the side of the light guide film 30 facing the back plate 10, and the emitted light will pass through the light guide film. 30 will be re-injected into the light guide film 30 after reflection on the reflective sheet 33 attached to the back plate 10, so that the light cannot be emitted from the side of the light guide film 30 facing the back plate 10, thereby ensuring that the light can be emitted from the light exit surface 32 to the liquid crystal. The panel 20 improves the light emitted by the light source element 40 that the liquid crystal panel 20 can receive. Specifically, the material of the light guide film 30 may be PET (Polyethylene terephthalate, polyethylene terephthalate), with a refractive index of 1.65. The diffusion layer 34 of the light guide film 30 can diffuse the light incident on the diffusion layer 34 to ensure that the light emitted from the diffusion layer 34 is more uniform.

Further, in a preferred embodiment, a plurality of convex dots 35 are formed on the side of the light guide film 30 close to the reflection sheet 33, and the convex dots 35 can be formed by hot pressing of the light guide film 30, and the plurality of convex dots 35 are arranged at intervals, and a reflective film (not shown) is provided on the outer surface of each convex dot 35, and the reflective film can totally reflect the light that enters the light guide film 30 and reaches the convex dot 35, Since the normal directions made on different points of the convex dots 35 are inconsistent, the directions of the total reflection of light rays entering different positions on the convex dots 35 are also different, so that the light entering the light guide film 30 can be diffused. Reflection, so that the light propagates to the end away from the light incident surface 31 in the light guide film 30 and emits to the light exit surface 32, so that the light exit surface 32 of the light guide film 30 can emit uniform light.

In the above embodiment, referring to FIG. 2 and FIG. 3 , the plurality of convex dots 35 in the light guide film 30 are distributed in a dislocation manner. It is also possible to set the row spacing between each row of convex dots 35 and the adjacent row of convex dots 35 to be equal. By arranging the convex dots 35 in the light guide film 30 according to a certain rule, it can be ensured that the light diffusely reflected by the convex dots 35 can be emitted to the liquid crystal panel 20 relatively uniformly, thereby ensuring that the liquid crystal panel 20 is bright and uniform. display effect.

Specifically, continuing to refer to FIG. 3 , the convex dots 35 in the light guide film 30 are distributed in a determinant manner, and when the convex dots 35 are set as hemispherical dots, the actual calculation formula for the density of the convex dots 35 is:

ρ=πr ² /(x*y);

Wherein, ρ is dot density, r is the radius of hemispherical convex dot 35, x is the spacing of adjacent convex dots 35 in the same row, and y is the spacing of convex dots 35 in adjacent rows.

In this embodiment, as the convex grid dots 35 are far away from the light incident surface 31 of the light guide film 30, the incident angle of the light rays to the convex grid dots 35 becomes larger and larger, and the distance between the convex grid dots 35 and the light incident surface 31 becomes larger. Farther away, in order to keep away from the light guide film 30 at the light incident surface 31 and still be able to emit light evenly to the liquid crystal panel 20, it is necessary to increase the density of the convex network dots 35 when the convex network dots 35 are far away from the light incident surface 31. Refer to As shown in Fig. 4, Fig. 4 is the density design curve of convex dots, the formula for setting the density of convex dots 35 is:

ρ=a*l ^b +G;

Wherein, a and b are preset curvature parameters, G is the initial value of the density of the convex dots 35 , and l is the distance between the convex dots 35 and the light incident surface 31 . It should be noted that more light will be accumulated at the end of the light guide film 30 away from the light incident surface 31, thereby forming a section of bright area, which will affect the display effect of the liquid crystal panel 20. The density of the convex dots 35 within the preset area at one end of the smooth surface 31 needs to be reduced on the basis of the density calculated according to the density formula of the convex dots 35, that is, the density value of the solid line part replaces the density value of the dotted line part In order to prevent the light from accumulating at the end of the light guide film 30 and causing a part of the liquid crystal panel 20 to form a bright area.

Furthermore, the diffusion layer 34 of the light guide film 30 is uniformly coated with diffusion particles 341 , and the diffusion particles 341 can diffuse the light passing through the diffusion layer 34 , so that the light emitted to the liquid crystal panel 20 is more uniform. Specifically, the diffusion particles 341 may be PMMA (polymethyl methacrylate, polymethyl methacrylate) particles. PMMA particles can also be mixed with glue and coated on the side of the light guide film 30 close to the liquid crystal panel 20 to form the light exit surface 32 of the light guide film 30 .

Referring to FIG. 2 , in a preferred embodiment, the direct-type backlight module further includes a cooling frame 50 installed on the backplane 10, and the light source element 40 can be installed on the cooling frame 50, so that when the light source element 40 emits light, the The heat is dissipated through the cooling frame 50 to prolong the service life of the light source element 40 .

Further, the heat dissipation frame 50 can be a first heat dissipation strip 51 and a second heat dissipation strip 52 perpendicular to each other, the first heat dissipation strip 51 is attached on the backplane 10, the second heat dissipation strip 52 is arranged perpendicular to the first heat dissipation strip 51, and The light source elements 40 are mounted on both sides of the second heat dissipation bar 52 . Wherein, the light source element 40 can be an LED light bar, and by installing two LED light bars on both sides of the second heat dissipation bar 52, the light guide film 30 on both sides of the second heat dissipation bar 52 can receive corresponding The light emitted by the LED light bar uses one cooling frame 50 to dissipate heat for two LED light bars, thereby reducing the number of cooling frames 50 and lowering the module cost.

Further, continuing to refer to FIG. 2 , the light incident surface 31 of the light guide film 30 is disposed opposite to the light source element 40 , so that the light guide film 30 can receive the light emitted by the light source element 40 as much as possible. The height of the light incident surface 31 of the light guide film 30 can be set to be greater than or equal to the height of the light emitting area of the light source element 40, that is, H≥h, so that the light emitted by the light emitting area of the light source element 40 can enter the light incident surface 31 as much as possible , to improve the utilization rate of light energy of the light source element 40 . It should be noted that the light incident surface 31 of the light guide film 30 can also be separated from the light-emitting area of the light source part 40 by a certain gap, so as to prevent the light guide film 30 from being damaged by the heat emitted by the light source part 40 and ensure the safety of the module. sex. Specifically, the gap between the light incident surface 31 and the light source element 40 may be 0.4mm.

In a preferred embodiment, a spacer 53 is provided near the light source element 40 on the backplane 10, and the light guide film 30 is installed and fixed on the backplane 10 through the spacer 53, so that the incident light of the light guide film 30 The surface 31 can be raised up by the spacer 53 to face the light source element 40 , so that more light emitted by the light source element 40 enters the light incident surface 31 .

In addition, the present invention also provides a display, which includes the above-mentioned direct-lit backlight module. For the specific structure of the direct-lit backlight module, refer to the above-mentioned embodiments. Since the robot adopts all the technical solutions of the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, and will not repeat them here.

The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Under the conception of the present invention, the equivalent structural transformation made by using the description of the present invention and the contents of the accompanying drawings, or directly/indirectly used in other related All technical fields are included in the patent protection scope of the present invention.

Claims (10)

1. a kind of down straight aphototropism mode set, including backboard and the liquid crystal display panel being mounted on backboard, the liquid crystal display panel with it is described Cavity is formed between backboard, which is characterized in that the down straight aphototropism mode set further include:

Multiple light guiding films, multiple light guiding films are placed in the cavity, and multiple light guiding film arranged for interval and are covered Light source component is provided between the backboard, two light guiding films of arbitrary neighborhood；

The light guiding film is formed with incidence surface towards the side of the light source component, the light guiding film towards the liquid crystal display panel one Side is formed with light-emitting surface, and the light that the light source component issues is injected in the light guiding film by the incidence surface, and described in process It is projected from the light-emitting surface to liquid crystal display panel after light guiding film diffusing reflection.

2. down straight aphototropism mode set as described in claim 1, which is characterized in that side of the light guiding film towards the backboard Being sticked has reflector plate, and the light guiding film is provided with diffusion layer towards the side of the liquid crystal display panel, and the diffusion layer is formed State light-emitting surface.

3. down straight aphototropism mode set as claimed in claim 2, which is characterized in that close to the reflector plate in the light guiding film Side is formed with multiple convex sites, and multiple convex site arranged for interval, the outer surface of the convex site is provided with instead Penetrate film.

4. down straight aphototropism mode set as claimed in claim 2, which is characterized in that multiple site Heterogeneous Permutations.

5. down straight aphototropism mode set as claimed in claim 2, which is characterized in that even spread has diffusion grain on the diffusion layer Son.

6. down straight aphototropism mode set according to any one of claims 1 to 5, which is characterized in that the down straight aphototropism mode set It further include the heat radiation rack being mounted on the backboard, the light source component is installed on the heat radiation rack.

7. down straight aphototropism mode set as claimed in claim 6, which is characterized in that the heat radiation rack includes being sticked on backboard First heat sink strip and the second heat sink strip being vertically mounted on first heat sink strip, the two sides of second heat sink strip are respectively mounted There is the light source component.

8. down straight aphototropism mode set according to any one of claims 1 to 5, which is characterized in that the incidence surface and the light The setting of source part face, and the height of the incidence surface is greater than or equal to the height of the light source component.

9. down straight aphototropism mode set according to any one of claims 1 to 5, which is characterized in that close to described on the backboard The position of light source component is provided with cushion block, and the light guiding film is installed on the backboard by the cushion block, so that the incidence surface It is arranged with the light source component face.

10. a kind of display, which is characterized in that the display includes straight-down negative as claimed in any one of claims 1-9 wherein Backlight module.