CN217875539U - Backlight module and display device - Google Patents

Abstract

The utility model relates to a backlight module and a display device, the backlight module comprises a substrate, a plurality of direct type light-emitting units are distributed on the substrate; the optical film layer group is arranged on the light emergent side of the substrate; the light guide plate is positioned between the optical film layer group and the substrate; the lateral entrance type light emitting structure is arranged at one end of the light guide plate and comprises a lateral entrance lamp bar and a lateral entrance type light emitting unit arranged on the lateral entrance lamp bar, and the light emitting surface of the lateral entrance type light emitting unit faces the light guide plate; the peep-proof retaining wall is arranged on the substrate and surrounds the direct type light emitting unit, the height of the peep-proof retaining wall is larger than that of the direct type light emitting unit, and the peep-proof retaining wall is configured to reduce the light emitting angle of the direct type light emitting unit. The utility model discloses a control opening or the closed state of side income formula luminescence unit and straight following formula luminescence unit respectively, can realize the display effect that peep-proof mode, sharing mode and the three kinds of states of subjective observation mode switch.

Description

Backlight module and display device

Technical Field

The utility model relates to a show technical field, especially relate to a backlight unit and display device.

Background

With the improvement of various display performance requirements of people, application scenes of the display industry are becoming rich, generally, display devices have large visual angles, and users at different visual angles can know displayed information. However, in some scenarios, users want to protect business confidentiality or personal privacy, and more users are demanding a privacy mode for devices such as cars, televisions, tablets, and mobile phones, and want a display device to have a privacy function.

In the current display technology, in order to achieve the peep-proof performance of the display panel, a common processing method is to attach a peep-proof film to the surface of the display, and filter light with a large viewing angle through the peep-proof film, but once the peep-proof film is attached, only a peep-proof mode can be used, and this method cannot achieve free switching between the peep-proof mode and the sharing mode.

Therefore, how to realize the free switching between the privacy protection mode and the sharing mode is an urgent problem to be solved.

SUMMERY OF THE UTILITY MODEL

In view of the foregoing deficiencies of the prior art, an object of the present application is to provide a backlight module and a display device, which aim to solve the problem of freely switching between a privacy protection mode and a sharing mode.

Therefore, the present application provides a backlight module, comprising:

a substrate on which a plurality of direct type light emitting units are arranged;

the optical film layer group is arranged on the light emergent side of the substrate;

the optical plate is positioned between the optical film layer group and the substrate;

the lateral entrance type light emitting structure is arranged at one end of the light guide plate and comprises a lateral entrance light bar and a lateral entrance type light emitting unit arranged on the lateral entrance light bar, and the light emitting surface of the lateral entrance type light emitting unit faces the light guide plate;

peep-proof barricade, set up on the base plate and center on straight following formula luminescence unit, peep-proof barricade highly be greater than straight following formula luminescence unit's height, peep-proof barricade configuration reduces straight following formula luminescence unit's light-emitting angle.

According to the backlight module, the side-in type light-emitting unit, the direct type light-emitting unit and the peep-proof retaining wall are arranged to respectively control the opening or closing states of the side-in type light-emitting unit and the direct type light-emitting unit, so that the display effect of switching three states of the peep-proof mode, the sharing mode and the main observing mode can be realized; through setting up peep-proof barricade, reducible wide-angle light to realize the peep-proof effect.

Optionally, the space that straight following formula luminescence unit around peep-proof barricade encloses the synthesis is filled with first stratum lucidum, peep-proof barricade is transparent barricade, peep-proof barricade towards the one side of light guide plate and first stratum lucidum covers and is equipped with the second stratum lucidum, just the refracting index of first stratum lucidum, peep-proof barricade and second stratum lucidum increases in proper order. The structure can change the large-angle light rays emitted by the direct type light-emitting unit through the influence of the refractive index on the light path, so that the large-angle light rays sequentially pass through the first transparent layer, the peep-proof retaining wall and the second transparent layer and are converted into the small-angle light rays through two refractions, and the peep-proof effect is achieved.

Optionally, a plurality of light path fine-tuning structures corresponding to the direct-type light-emitting units one to one and used for further reducing the light-emitting angle are disposed on one side of the second transparent layer facing the light guide plate. According to the structure, the light path fine adjustment structures are arranged on the light emitting surface of the second transparent layer, so that the light path passing through the light path fine adjustment structures can be changed, emergent rays are further changed into small-angle rays, and the effect of light convergence is achieved.

Optionally, the light path fine adjustment structure is in a shape of a polygon. The structure can adjust the angle of the emergent light of the direct-down type light-emitting unit through the light path fine adjustment structure with the shape of the polygon pyramid, so that the large-angle light is converted into the small-angle light.

Optionally, the peep-proof retaining wall is a light absorption retaining wall to absorb the light emitted from the direct type light emitting unit to the peep-proof retaining wall. According to the structure, the light absorption retaining wall can be arranged to absorb the large-angle light of the direct type light emitting unit, so that the large-angle light is reduced, and the peeping prevention effect is achieved.

Optionally, the side wall of the peep-proof retaining wall is provided with a reflecting layer, and an acute angle is formed between the side wall of the peep-proof retaining wall and the substrate. According to the structure, the reflection of the reflection layer on light rays and the angle of the light rays incident to the reflection layer are utilized, so that the large-angle light rays emitted by the direct type light emitting unit are converted into small-angle light rays, and the peep-proof effect is achieved. The angle and the height of the peep-proof retaining wall can be adjusted and designed according to the display effect.

Optionally, the backlight module further includes a control chip for controlling the direct type light emitting unit and the side type light emitting unit respectively. With the structure, the control chip can respectively control the respective open and close states of the direct type light-emitting unit and the side type light-emitting unit, so that the switching among three modes is realized.

Optionally, the optical film layer group comprises a lower diffusion sheet, a brightness enhancement film, an upper diffusion sheet and a light condensation film, which are sequentially stacked along the light emitting side of the substrate. The structure can realize the effects of diffusion homogenization, brightening enhancement, color conversion and the like of light rays through the optical film layer group. Optionally, the direct type light emitting unit and/or the lateral type light emitting unit are/is an RGB single lamp or an RGB package form, a blue LED plus phosphor package form, a blue LED plus QD package form, a blue LED or a blue LED in a package form;

when the direct type light emitting unit and/or the side type light emitting unit is a blue light LED or a blue light LED in a packaging form, the optical film layer group comprises a quantum dot film for exciting white light.

Based on same utility model design, this application still provides a display device, include: the display panel and the backlight module are arranged in a laminated manner and are positioned on the light emitting side of the backlight module;

in the sharing mode, the lateral light-emitting unit is turned on;

in the peep-proof mode, the direct type light emitting unit is turned on, and the side type light emitting unit is turned off;

in the main observation mode, the direct type light emitting unit and the lateral type light emitting unit are simultaneously turned on.

According to the display device, the display device applying the backlight module can be freely switched among the sharing mode, the peep-proof mode and the main observation mode as required, and different scene requirements of users are met.

Drawings

Fig. 1 is a schematic structural diagram of a backlight module in the prior art;

fig. 2 is a schematic structural diagram of a backlight module according to an exemplary embodiment of the present invention;

fig. 3 is a schematic light path diagram of a backlight module structure in a sharing mode according to an exemplary embodiment of the present invention;

fig. 4 is a schematic light path diagram of the backlight module structure in the peep-proof mode according to the exemplary embodiment of the present invention;

fig. 5 is a schematic optical path diagram of the backlight module structure in the main viewing mode according to the exemplary embodiment of the present invention;

fig. 6 is a schematic structural view of the peep-proof baffle according to an exemplary embodiment of the present invention;

fig. 7 is a schematic structural view of a peep-proof baffle according to another exemplary embodiment of the present invention;

fig. 8 is a schematic structural view of a peep-proof baffle wall according to still another exemplary embodiment of the present invention.

Description of reference numerals:

100 a-a substrate; 110 a-a light emitting element; 200 a-a diffuser; 300 a-a reflective sheet; 400 a-a quantum dot film; 500 a-a light splitting film; 600 a-a brightness enhancement film;

100-a substrate; 101-a first surface; 102-a second surface; 110-direct type light emitting unit; 120-peep-proof retaining wall; 121-a reflective layer; 130-a first transparent layer; 140-a second transparent layer; 141-optical path fine tuning structure;

200-a light guide plate;

300-entering a light bar laterally; 310-lateral light emitting unit;

400-lower diffusion sheet; 500-a brightness enhancement film; 600-upper diffusion sheet; 700-light concentrating film.

Detailed Description

To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present application are given in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

Referring to fig. 1, the conventional Mini-LED or Micro-LED display backlight module includes a substrate 100a, a plurality of light emitting elements 110a disposed on the substrate 100a, and a diffusion sheet 200a, a reflection sheet 300a, a quantum dot film 400a, a light splitting film 500a, and a brightness enhancement film 600a sequentially disposed on a light-emitting side of the substrate 100 a. The light emitting element 110a is a blue light LED chip with the same waveband and is used for emitting a blue light source when current passes through the blue light LED chip; the substrate 100a is used for bearing the light emitting element 110a and a conducting circuit, the diffusion sheet 200a is used for diffusing light emitted by the light emitting element 110a to homogenize the light, the reflector 300a is used for reflecting RG light (red and green light) emitted after the blue light of the upper layer light emitting element 110a excites the quantum dot film 400a for secondary utilization, and the quantum dot film 400a is used for exciting red light and green light together with the blue light LED; the light splitting film 500a may be a single layer or a plurality of layers for dispersing the light beam to homogenize the light; the brightness enhancement film 600a is used to focus the outgoing light rays, thereby enhancing the light in the vertical direction. The light emitted by the design can still enter human eyes at a large angle, and the peep-proof effect is not achieved.

Based on this, the present application intends to provide a solution to the above technical problem, the details of which will be explained in the following embodiments.

Referring to fig. 2, the present application provides a backlight module, which includes a substrate 100, an optical film group, a light guide plate 200, a side-in light emitting structure, and an anti-peeping retaining wall 120, wherein a plurality of direct light emitting units 110 are distributed on the substrate 100; the substrate 100 has a first surface 101 and a second surface 102 opposite to each other, and a plurality of direct-type light emitting units 110 are disposed on the first surface 101; an optical film layer group disposed on the light exit side of the substrate 100; the light guide plate 200 is located on the light emitting side of the substrate 100 and located between the optical film layer group and the substrate 100; the lateral entrance type light emitting structure is arranged at one end of the light guide plate 200 and comprises a lateral entrance light bar 300 and a lateral entrance type light emitting unit 310 arranged on the lateral entrance light bar 300, a light emitting surface of the lateral entrance type light emitting unit 310 faces the light guide plate 200, and a light path of the lateral entrance type light emitting unit 310 can be guided by the light guide plate 200 to be uniformly dispersed; the anti-peeping retaining wall 120 is disposed on the substrate 100 and surrounds the direct illumination unit 110, the height of the anti-peeping retaining wall 120 is greater than that of the direct illumination unit 110, and the anti-peeping retaining wall 120 is configured to reduce the light-emitting angle of the direct illumination unit 110.

Referring to fig. 3, when the sharing mode is used, the plurality of side-in light-emitting units 310 on the side-in light bar 300 can be controlled to be turned on, so that the display shows the sharing state; referring to fig. 4, when the peep-proof mode is required, only the plurality of direct light emitting units 110 on the driving substrate 100 may be controlled to be turned on, so that the peep-proof state is displayed under the action of the peep-proof retaining wall 120; referring to fig. 5, when the main observation mode is required, the direct illumination unit 110 and the lateral illumination unit 310 may be controlled to be turned on simultaneously, so that the effect of increasing light with a large angle and a small angle is achieved, thereby providing a display state with enhanced main observation.

In the backlight module, the lateral light-emitting unit 310, the direct light-emitting unit 110 and the peep-proof retaining wall 120 are arranged to respectively control the open or close states of the lateral light-emitting unit 310 and the direct light-emitting unit 110, so that the display effect of switching three states of the peep-proof mode, the sharing mode and the main observing mode can be realized; through setting up peep-proof barricade 120, reducible wide-angle light to realize the peep-proof effect.

The direct light emitting unit 110 and/or the side light emitting unit 310 of the above and below embodiments are RGB single lamps, RGB package, blue LED and phosphor package, blue LED and QD package, blue LED or blue LED in package. Specifically, the direct illumination unit 110 and/or the lateral illumination unit 310 may be LEDs of a common size, mini-LEDs, micro-LEDs, nano-LEDs, or LEDs of other sizes. When the direct type light emitting unit and/or the side type light emitting unit is a blue light LED or a blue light LED in a packaging form, the optical film layer group comprises a quantum dot film for exciting white light.

In some embodiments, the plurality of direct-type light emitting units 110 are arranged on the substrate 100 in an array manner, but in an actual implementation process, the direct-type light emitting units 110 may be arranged in other manners, for example, a group of direct-type light emitting units 110 may be used as a light emitting group, so that each light emitting group is arranged on the substrate 100 in an array manner. A plurality of the anti-peeping barriers 120 are disposed around the direct type light emitting unit 110, and the manner in which the anti-peeping barriers 120 are disposed on the substrate 100 will be described in detail below.

In some embodiments, each of the individual direct illumination units 110 is provided with a privacy wall 120 at its periphery. In other embodiments, one light emitting group includes at least two direct light emitting units 110, and a peep-proof wall 120 is disposed around each light emitting group.

The peep-proof retaining wall 120 arranged around the plurality of direct type light emitting units 110 can reduce the emergent large-angle light, and the peep-proof effect can be achieved by adjusting the large-angle light to be the small-angle light or absorbing the large-angle light. The detailed structure of the peep preventing wall 120 will be described in detail below.

With reference to fig. 6, in some embodiments, a space surrounded by the anti-peeping walls 120 around the direct illumination unit 110 is filled with a first transparent layer 130, the anti-peeping walls 120 are transparent walls, a second transparent layer 140 is covered on one side of the light guide plate 200 facing the anti-peeping walls 120 and the first transparent layer 130, and refractive indexes of the first transparent layer 130, the anti-peeping walls 120 and the second transparent layer 140 are sequentially increased. Specifically, the first transparent layer 130 is filled in a space enclosed by the peep-proof retaining wall 120 and the direct-type light emitting unit 110, and the second transparent layer 140 is covered on the first transparent layer 130 and the peep-proof retaining wall 120 as an encapsulation layer. The high-angle light emitted from the direct illumination unit 110 is incident into the anti-peeping retaining wall 120 through the first transparent layer 130, and since the refractive indexes of the first transparent layer 130, the anti-peeping retaining wall 120 and the second transparent layer 140 are sequentially increased, a first refraction occurs between the two media of the first transparent layer 130 and the anti-peeping retaining wall 120, so that the light angle is reduced; the large-angle light is incident into the second transparent layer 140 from the privacy wall 120, and a second refraction occurs between the two media of the privacy wall 120 and the second transparent layer 140, so as to reduce the light angle again. The large-angle light emitted from the direct illumination unit 110 can be changed by the influence of the refractive index on the light path, so that the large-angle light passes through the first transparent layer 130, the peep-proof retaining wall 120 and the second transparent layer 140 in sequence, and is converted into the small-angle light by two refractions, thereby achieving the peep-proof effect.

With reference to fig. 6, a plurality of light path fine-tuning structures 141 corresponding to the direct-type light emitting units 110 one by one and used for further reducing the light emitting angle are disposed on one side of the second transparent layer 140 facing the light guide plate 200. The orthographic projection of each optical path fine adjustment structure 141 on the substrate 100 is at least partially overlapped with the orthographic projection of the corresponding direct-type light emitting unit 110 on the substrate 100. Specifically, the light path fine-tuning structure 141 has a light path adjusting function, and the shape and the arrangement density of the light path fine-tuning structure 141 can be designed according to the light path adjusting effect. By arranging the light path fine-tuning structures 141 on the light emitting surface of the second transparent layer 140, the light path passing through the light path fine-tuning structures 141 can be changed, so that the large-angle light is further converted into the small-angle light, the light converging effect is achieved, and the peep-proof effect is improved.

Illustratively, the light path fine adjustment structure 141 is in a shape of a polygon cone. With this structure, the angle adjustment of the light emitted from the direct-type light emitting unit 110 can be achieved by the light path fine-tuning structure 141 with a polygonal pyramid shape, so that the large-angle light is converted into the small-angle light.

Referring to fig. 7, in other embodiments, the peep-proof retaining wall 120 is a light-absorbing retaining wall to absorb light emitted from the direct illumination unit 110 to the peep-proof retaining wall 120. Specifically, the light absorption retaining wall can be made of a black light absorption material so as to achieve the light absorption effect. Through setting up the extinction barricade, absorb the wide-angle light of straight following formula luminescence unit 110 to reduce wide-angle light, and then realize the peep-proof effect.

Referring to fig. 8, in other embodiments, the reflective layer 121 is disposed on the sidewall of the anti-peeping wall 120, an acute angle is formed between the sidewall of the anti-peeping wall 120 and the substrate 100, and the anti-peeping wall 120 is in a regular trapezoid shape or a tapered shape. Specifically, the reflective layer 121 may be made of a reflective material, and has a reflective effect on light, so that the light incident on the reflective layer 121 can be reflected, thereby changing the angle of the light. And, to convert the high angle rays to low angle rays, an acute angle is provided between the sidewall of the wall and the base plate 100 to warrant the effect of the angular adjustment. With such a structure, the reflection of the light by the reflective layer 121 and the angle of the light incident on the reflective layer 121 are utilized to convert the large-angle light emitted from the direct-type light emitting unit 110 into small-angle light, thereby achieving the anti-peeping effect. The angle and height of the anti-peeping wall 120 can be adjusted according to the display effect.

It is understood that the backlight module further includes a control chip for controlling the direct type light emitting unit 110 and the side type light emitting unit 310, respectively. The control chip can adopt an IC control chip. The control chip can control the respective on and off states of the direct type light emitting unit 110 and the side type light emitting unit 310, thereby realizing the switching among the three modes.

With reference to fig. 2, in the above embodiments, the backlight module further includes an optical film layer set disposed on the light emitting side of the substrate 100, and the light guide plate 200 is located between the optical film layer set and the substrate 100. The structure can realize the effects of diffusion homogenization, brightening enhancement, color conversion and the like of light rays through the optical film layer group. Specifically, the optical film group includes a lower diffusion sheet 400, a brightness enhancement film 500, an upper diffusion sheet 600, and a light collection film 700 stacked in sequence along the light exit side of the substrate 100, and the light guide plate 200 is located between the direct light emitting unit 110 and the lower diffusion sheet 400. The lower diffusion sheet 400 and the upper diffusion sheet 600 are used for diffusing emergent light to make the emergent light uniform; the brightness enhancement film 500 is used for gathering light with large angle, so as to enhance light in the vertical direction; the light-gathering film 700 adopts a DBFE film, so that the utilization rate of emergent light is enhanced.

In practical implementation, the lamination sequence of each membrane in the optical membrane layer group can be adjusted according to requirements, and the lamination sequence in the figure is not necessarily adopted.

The light emitting module of each embodiment can be applied to a display device. The corresponding display device comprises a display panel (not shown) and the backlight module, wherein the display panel and the backlight module are stacked and positioned on the light emitting side of the backlight module. In the sharing mode, the lateral light emitting unit 310 is turned on; in the peep-proof mode, the direct illumination type light emitting unit 110 is turned on, and the side illumination type light emitting unit 310 is turned off; in the main viewing mode, the direct type light emitting unit 110 and the lateral type light emitting unit 310 are simultaneously turned on. Above-mentioned display device can make the display device who uses this backlight unit freely switch between sharing mode, peep-proof mode and the three kinds of states of subjective observation mode as required, satisfies user's different scene demands.

The utility model discloses can be used to the LED of Mini-LED/Micro-LED/nanometer size or the LED collocation quantum dot membrane of other sizes be applied to demonstration and the field of being shaded, can adopt display modes such as dysmorphism, flexibility, curved surface, plane, can be used to application fields such as dress, cell-phone, notebook computer, flat board, vehicle mounted display, control screen.

It should be understood that the application of the present invention is not limited to the above examples, and that modifications or changes can be made by those skilled in the art based on the above description, and all such modifications and changes are intended to fall within the scope of the appended claims.

Claims (10)

1. A backlight module, comprising:

a substrate on which a plurality of direct type light emitting units are arranged;

the optical film layer group is arranged on the light emergent side of the substrate;

the light guide plate is positioned between the optical film layer group and the substrate;

the lateral entrance type light emitting structure is arranged at one end of the light guide plate and comprises a lateral entrance light bar and a lateral entrance type light emitting unit arranged on the lateral entrance light bar, and the light emitting surface of the lateral entrance type light emitting unit faces the light guide plate;

peep-proof barricade, set up on the base plate and center on straight following formula luminescence unit, peep-proof barricade highly be greater than straight following formula luminescence unit's height, peep-proof barricade configuration reduces straight following formula luminescence unit's light-emitting angle.

2. The backlight module as claimed in claim 1, wherein a space surrounded by the anti-peeping walls around the direct-type light emitting unit is filled with a first transparent layer, the anti-peeping walls are transparent walls, a second transparent layer is covered on one side of the anti-peeping walls facing the light guide plate and the first transparent layer, and refractive indexes of the first transparent layer, the anti-peeping walls and the second transparent layer are sequentially increased.

3. The backlight module as claimed in claim 2, wherein a plurality of light path fine-tuning structures corresponding to the direct-type light emitting units one by one and used for further reducing light-emitting angles are disposed on one side of the second transparent layer facing the light guide plate.

4. The backlight module as claimed in claim 3, wherein the light path fine-tuning structure is in a shape of a multi-pyramid.

5. The backlight module as claimed in claim 1, wherein the anti-peeping retaining wall is a light-absorbing retaining wall for absorbing light emitted from the direct-type light-emitting unit to the anti-peeping retaining wall.

6. The backlight module as claimed in claim 1, wherein the sidewalls of the anti-peeping wall are provided with a reflective layer, and an acute angle is formed between the sidewalls of the anti-peeping wall and the substrate.

7. The backlight module according to any one of claims 1 to 6, further comprising a control chip for controlling the direct-type light emitting unit and the side-type light emitting unit, respectively.

8. The backlight module as claimed in claim 7, wherein the optical film group comprises a lower diffuser, a brightness enhancement film, an upper diffuser and a light condensing film sequentially stacked along the light exit side of the substrate.

9. The backlight module as claimed in claim 1, 2, 3, 4, 5, 6 or 8, wherein the direct-type light emitting unit and/or the side-type light emitting unit is an RGB single lamp or an RGB package form, a blue LED and phosphor package form, a blue LED and QD package form, a blue LED or a blue LED in a package form;

when the direct type light emitting unit and/or the side type light emitting unit is a blue light LED or a blue light LED in a packaging form, the optical film layer group comprises a quantum dot film for exciting white light.

10. A display device, comprising: a display panel and the backlight module as claimed in any one of claims 1 to 9, wherein the display panel and the backlight module are stacked and located at the light-emitting side of the backlight module;

in the sharing mode, the lateral light-emitting unit is turned on;

in the peep-proof mode, the direct type light emitting unit is turned on, and the side type light emitting unit is turned off;

in the main observation mode, the direct type light emitting unit and the side type light emitting unit are simultaneously turned on.

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