CN204829754U - A thin backlight module - Google Patents

Abstract

The embodiment of the utility model discloses slim backlight module for reduce device number of piles and thickness. The embodiment of the utility model provides an in slim backlight module, include: a light guide film comprising a first surface and a second surface opposite to the first surface, the first surface facing an input module, wherein the input module comprises more than one opaque structure defining more than one light-transmitting region within the input module; a reflector sheet disposed adjacent to the second surface and including an upper surface adjacent to the light directing film; a conductive layer formed on a portion of the upper surface and conducting electricity; and more than one light-emitting unit which is configured on the conducting layer and receives the electric power to emit a light source.

Description

A thin backlight module

technical field

The utility model relates to a backlight module, in particular to a thin backlight module whose composition structure does not include a flexible circuit substrate and a light-shielding sheet.

Background technique

With the advancement of technology, all kinds of portable electronic devices, wearable devices, etc., need to have basic light-emitting functions for indication, lighting, light-emitting and other purposes, because the backlight module (BackLightModule, BLM) Surface light source and other advantages, so BLM began to be widely and widely used as a light source on various electronic devices, especially various mobile devices that include backlight modules, such as: notebook computers, mobile phones, smart phones, tablet computers , tablet phone, keyboard cover, touch cover, keyboard back cover, touch back cover and backlit keyboard, etc.

Figure 1a shows a schematic side view of a commonly used luminous input device. The luminous input device 1 includes a backlight module 10 and an input module 19. The backlight module 10 also includes components such as a light guide plate 11, a light source module 12, a light-shielding film 13, and a reflective sheet 14. The light source module 12 also includes a flexible circuit board (FPC) 15 and a light-emitting diode (LED) 16. The light-shielding film 13 is also coated with a black light-shielding layer 17 or a white reflective layer 18. The light source emitted by the light-emitting diode 16 enters the light guide plate After 11, the light is guided, diffused and mixed by the light guide plate 11, and then reflected by the reflective sheet 14, and finally the light is emitted from the light emitting surface S to form a surface light source L to provide illumination for the input module 19.

Figure 1b shows a schematic top view of a commonly used light source module. The light source module 12 includes a flexible circuit substrate 15 and a plurality of light-emitting diodes 16 arranged on the flexible circuit substrate 15. There are multiple conductive circuits 21 on the flexible circuit substrate 15. The line 21 receives power from the power input terminal 22 and transmits it to the plurality of LEDs 16 to drive the LEDs 16 to emit light.

That is, the commonly used backlight module mainly includes four-layer structure, which are: light-shielding film, light guide plate, reflector and light source module from top to bottom. However, with the trend of miniaturization, thinner and lighter electronic devices, such four layers Layer structure, no matter in terms of thickness, weight and cost, seems to have room for improvement.

Utility model content

The utility model proposes a new structure related to the backlight module. The commonly used light source module (FPCwithLEDs) is changed to be configured on the reflector. The light-transmitting structure is used to replace the light-shielding sheet in the backlight module, so the light-shielding sheet is not used in the backlight module at all.

The thin backlight module of the utility model can effectively reduce the number of layers and thickness of the device, not only improve the overall luminous efficiency of the backlight module, simplify the manufacturing procedure, but also further reduce the production cost, and can easily produce a new type of backlight that is thinner than the commonly used backlight module module.

A thin backlight module provided by an embodiment of the utility model includes:

A light guide film, which includes a first surface and a second surface opposite to the first surface, the first surface faces an input module, wherein the input module includes more than one opaque structure, so The opaque structure defines more than one light-transmitting area in the input module;

A reflective sheet, which is arranged at a position close to the second surface, and includes an upper surface close to the light guide film;

a conductive layer formed on a portion of the upper surface and conducts electricity; and

More than one light-emitting unit, the light-emitting unit is arranged on the conductive layer and electrically connected to the conductive layer, each of the light-emitting units receives the power provided by the conductive layer to emit a light source, and the light source passes through configured to pass through the light guide film and the reflective sheet to emit from the first surface and form a surface light source to enter the input module, wherein the surface light source is in the opaque structure in the input module Light is emitted from the light-transmitting region under the shielding effect of the body.

Optionally, also include:

More than two marginal regions;

More than one light-emitting area, each of which is equipped with the light-emitting unit, and each of the light-emitting areas operates independently of each other and is separated from each other by more than two boundary areas;

a light-tight seal formed on the interface region and the edge region;

The light guide film further includes more than one through hole for accommodating the light emitting unit, and through this configuration, the light source passes through the light guide film and the reflection sheet.

Optionally, the reflective sheet further includes a lower surface opposite to the upper surface;

The conductive layer is arranged on the upper surface or the lower surface to serve as an electric wire layer for conducting the electric power;

The first surface is the light-emitting surface of the thin backlight module, and the light-emitting surface faces the input module.

Optionally, the light-tight sealing part is a sealing structure formed of light-tight glue.

Optionally, a light shielding layer is formed on a part of the surface of the light guiding film.

Optionally, the opaque structure includes a frame, a circuit layer, a light-shielding layer, a light-reflecting layer or a combination thereof.

Optionally, the set of the opaque structures forms an assembly of the opaque structures, and the light-transmitting area is defined by the assembly of the opaque structures.

Optionally, the input module is a luminous keyboard, a luminous key or a membrane key.

Optionally, a transparent part, a semi-transparent part or a fluorescent part is formed on the keycap of the input module, and the surface light source emits light from the transparent area and passes through the transparent part, semi-transparent part The light-transmitting part or the fluorescent part forms a light-emitting pattern.

Optionally, the thin backlight module is applied to a backlight keyboard module, a mobile phone, a smart phone, a tablet computer, a tablet phone, a keyboard protection cover, a touch protection cover, a keyboard back cover, a Touch the back cover or a laptop.

As can be seen from the above technical solutions, the utility model embodiment has the following advantages:

In the embodiment of the utility model, a thin backlight module can effectively reduce the number of layers and thickness of the device, not only improve the overall luminous efficiency of the backlight module, simplify the manufacturing process, but also further reduce the production cost, and can easily produce relatively common backlight modules New and thinner backlight module.

Description of drawings

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

Figure 1a shows a schematic side view of a commonly used backlight module;

Figure 1b shows a schematic top view of a commonly used light source module;

Fig. 2 is a side view structural diagram of the first embodiment of a thin backlight module in the utility model;

FIG. 3 is a schematic side view of a second embodiment of a thin backlight module of the present invention.

Graphical description:

1 illuminated input device

10 backlight module

11 light guide plate

12 light source modules

13 Shading film

14 reflectors

15 flexible circuit substrate

16 lighting units

17 Black shading layer

18 white reflective layer

19 input modules

21 conductive lines

22 power input

L surface light source

S light surface

B Bottom

F front

R back

200 thin backlight module

300 input modules

202 light guide film

2021 First Surface

2022 Second Surface

2023 through hole

204 reflective sheet

2041 upper surface

2042 lower surface

206 lighting units

206A light emitting unit

206B light emitting unit

208 conductive layer

301 frame

3011 frame opening

302 first film

3021 first circuit layer

3022 first shading layer

3023 first reflective layer

3024 first film opening

303 interstitial layer

304 second film

3041 second circuit layer

3042 second shading layer

3044 second film opening

305 keycaps

306 scissor foot type recovery mechanism

307 Shrapnel Reply Mechanism

308 transparent area

309 transparent area

310 transparent area

311 opaque structure assembly

401 light-tight sealing part

403 shading layer

E marginal area

Z junction

Detailed ways

The utility model will be fully understood by the following examples, so that those skilled in the art can complete it, but the implementation of the utility model can not be limited to its implementation form by the following examples of implementation; the utility model The drawings do not contain limitations on the size, size and scale, and the size, size and scale of the utility model cannot be limited by the drawings of the utility model during actual implementation.

The word "preferred" in this article is non-exclusive and should be understood as "preferably but not limited to". order, the scope of the present utility model should only be determined by the appended claims and their equivalents, and not by the examples of implementation examples; when the term "comprising" and its changes appear in the specification and claims, is an open-ended term that does not have a restrictive meaning and does not exclude other features or steps.

The shading sheet described in the embodiment of the utility model of this institute is also called a shading plate, a shading film, a shading layer, and a shading film in the technical field; the light guide film described in the utility model is in the technical field Also known as light guide plate, light guide sheet, light guide layer, light guide film; the reflective sheet described in this utility model is also called reflective plate, reflective film, reflective layer, reflective film, reflective sheet in the technical field , Reflective board, reflective film, reflective layer, reflective film.

Fig. 2 reveals the side view structural diagram of the first embodiment of the thin backlight module of the present invention; The input module 300 is used to output the light emitting surface S and the bottom side (bottomside) B of the surface light source L to the input module 300 .

On the thin backlight module 200, based on the position of the light guide film 202, a first surface 2021 as the light-emitting surface S, a second surface 2022 facing the bottom surface B, and a reflective sheet can be defined on the light guide film 202. 204 is disposed close to the second surface 2022 of the light guide film 202 or on the second surface 2022 of the light guide film 202. The reflective sheet 204 has two main surfaces, one of which is the upper surface facing the light exit surface S and close to the light guide film 202 2041, and the other is the lower surface 2042 facing the bottom surface B.

On part of the surface of the upper surface 2041 of the reflection sheet 204, a layer of conductive layer 208 is formed, and a plurality of light emitting units 206 are arranged on the conductive layer 208. The light emitting unit 206 is preferably a light emitting diode (LED), which is transmitted through the surface. Adhesive technology (SMT) is disposed on the conductive layer 208 and is electrically connected to the conductive layer 208. The light emitting unit 206 disposed on the reflective sheet 204 is finally assembled and aligned into the through hole 2023 on the light guide film 202 , the film body of the light guide film 202 has been punched in advance to open a plurality of through holes 2023 for accommodating the light emitting unit 206, and the plurality of light emitting units 206 provide incident light to the light guide film 202 from the side of the light guide film 202 The incident light is guided, diffused and mixed by the light guide film 202 , and then reflected by the reflective sheet 204 , and finally emerges from the light emitting surface S to form a surface light source L to provide an illumination source for the input module 300 .

The input module 300 is arranged in the direction facing the light-emitting surface S of the thin backlight module 200, close to the position of the light guide film 202, has a front side F facing the user and is provided with a pressing input, and is facing the backlight module 200. On the back side R, the input module 300 itself does not emit light, and it needs to receive the surface light source L provided by the backlight module 200 to produce a light-emitting effect. The light-emitting unit 206 in the backlight module 200 can emit light, and the emitted light is guided into the light guide through the configuration The film 202 then emits from the light-emitting surface S to become a surface light source L, and then enters the input module 300. The input module 300 can preferably be a luminous keyboard, a luminous key, or a membrane key.

In this embodiment, the input module 300 is illustrated by taking a light-emitting keyboard as an example. The input module 300 is also equipped with the following structures, for example: frame 301, frame opening 3011, first film 302, first circuit layer 3021, first light-shielding Layer 3022, first reflective layer 3023, first film opening 3024, spacer layer 303, second film 304, second circuit layer 3041, second light-shielding layer 3042, second film opening 3044, keycap 305, scissor foot type Structures such as the return mechanism 306 and the shrapnel type return mechanism 307.

Each keycap 305 has been provided with a light-transmitting part, a semi-transparent part or a fluorescent part corresponding to the specific pattern, character or symbol, etc. corresponding to the pattern, when the surface light source L passes through these light-transmitting parts on the keycap 305 After the semi-transparent part or the fluorescent part, the keycap 305 can show a luminous effect, and the luminous pattern of the bright light emitted by each keycap 305 is the style of the specific pattern, character or symbol represented by itself.

However, it is worth noting that the structures included in the input module 300 can be divided into two types: opaque and light-transmissible structures. For example, the frame itself is opaque but the frame openings on it It is light-transmitting. The film itself is light-transmitting, but the circuit layer, opaque layer, and reflective layer formed on it are all opaque. The keycap itself is opaque but the The light-transmitting part, the semi-transparent part, or the fluorescent part are all light-transmitting parts.

Therefore, when the surface light source L enters the input module 300 from the back R, it will naturally be shielded by various opaque structures in the input module 300, no matter what optical behavior the surface light source L performs in the input module 300, such as: penetration, Refraction, reflection, scattering, diffusion, etc., ultimately still only allow light to be emitted from the light-transmitting area that is not shielded and limited by the non-opaque structure.

Therefore, after integrating various opaque structures in the input module 300 , the resulting opaque structure assembly will naturally produce the same light-shielding effect as the shading sheet in a commonly used backlight module, that is, the interior of the input module 300 is opaque. The light structure assembly can play a light-shielding effect, which is equivalent to the light-shielding effect of the light-shielding sheet. Therefore, the light-tight structure assembly in the input module 300 can replace the light-shielding sheet. Naturally, the light-shielding sheet can be omitted in the backlight module 200 Configuration.

Taking the opaque structure disclosed in FIG. 2 as an example, the assembly of the opaque structure includes a frame 301, a first circuit layer 3021, a first light-shielding layer 3022, a first light-reflecting layer 3023, and a second circuit layer. 3041, the second light-shielding layer 3042 and other structures, these opaque structures can naturally define a plurality of light-transmitting regions 308, 309 and 310, etc., taking the luminous effect of the keycap 305 as an example, the surface light source L passes through the The light areas 308, 309, and 310 reach the keycap 305, and then pass through the transparent part, semi-transparent part or fluorescent part formed on the keycap 305, so that the keycap 305 can present a luminous effect, and each keycap 305 The luminous pattern that emits light is the pattern of a specific pattern, character or symbol represented by itself.

Therefore, it is worth noting that the components of the thin backlight module 200 of the present invention naturally do not need a light-shielding sheet, and the use of a light-shielding sheet can be omitted, and combined with the precise mechanism design and configuration of the input module 300, it is opaque through pre-planning The configuration of the structure to define the light-transmitting area can make the various opaque structures in the input module 300 have a better light-shielding effect, and can accurately and completely define the positions of the light-transmitting areas 308, 309, and 310. And reach the purpose of completely replacing the shading sheet.

Fig. 3 reveals the side-view structural diagram of the second embodiment of the thin backlight module of the present invention; the second embodiment includes all the features described in the first embodiment, and the thin backlight module 200 of the present invention includes a light guide film 202 and a reflective sheet 204 , Light-emitting unit 206A, light-emitting unit 206B, conductive layer 208 and other components, and include light-emitting area A and light-emitting area B, light-emitting unit 206A is set in light-emitting area A, light-emitting unit 206B is set in light-emitting area B, and light-emitting areas A and B are independent emit light, which can emit light in different colors or in different time phases, and operate independently of each other. The light-emitting area A and the light-emitting area B are separated on the junction area Z; the input module 300 includes two main parts, a plurality of light-transmitting areas 308, 309 and 310 , and parts such as the opaque structure assembly 311 except for the plurality of light-transmitting regions 308 , 309 and 310 .

In this embodiment, in order to prevent the light leakage that may be generated by the thin backlight module 200 around the edge area E, or between the different light emitting areas A and B around the border area Z, it is selected to use different Light-transmitting material, such as: white opaque glue, is filled between the thin backlight module 200 and the input module 300, and closes the gap between the thin backlight module 200 and the input module 300 on the edge area E and the junction area Z. A light-tight sealing portion 401 is formed on the area E and the border area Z, which not only prevents light leakage in the edge area E and the border area Z, but also has the effect of bonding the thin backlight module 200 and the input module 300 .

Moreover, since the plurality of light-transmitting regions 308, 309 and 310 are formed and defined through the disposition of the light-tight structure assembly 311 in the input module 300, in order to compensate for the inability of the light-tight structure assembly 311 to cover Part, to achieve a complete shielding effect, so you can choose to form a light shielding layer 403 on a part of the surface or a partial surface of the first surface 2021 of the light guide film 202, so as to reinforce the shortcomings of the light-tight structure assembly 311 or The shading effect of the missing places, for example: the shading layer can be black or white ink, which is formed on the partial surface of the first surface 2021 by printing or spraying, or the shading layer can be another small piece of opaque Light-shielding film, such as: Mylar light-shielding film, which is attached to a small part of the first surface 2021; it is worth noting that the light-shielding layer 403 is only partially or small-scale formed or covered on a part of the first surface 2021 Above, to make up for the part that the light-tight structure assembly 311 cannot cover, the light-shielding layer 403 will not completely cover the first surface 2021 .

Hereby further provide more embodiments of the present utility model as follows:

Embodiment 1: A thin backlight module comprising: a light guide film comprising a first surface and a second surface opposite to the first surface, the first surface faces an input module, wherein the input module It includes a plurality of opaque structures, and the opaque structures define a plurality of light-transmitting regions in the input module; a reflective sheet, which is arranged at a position close to the second surface, and includes a position close to the light guide film an upper surface of the upper surface; a conductive layer formed on a part of the upper surface and conducting an electric power; and a plurality of light emitting units arranged on the conductive layer and electrically connected to the conductive layer, each light emitting unit receiving the The electric power provided by the conductive layer is used to emit a light source. The light source is configured to pass through the light guide film and the reflection sheet, and exit from the first surface to become a surface light source and enter the input module, wherein the surface light source is received by the light source. The shielding of the opaque structures in the input module emits light from the light-transmitting regions.

Embodiment 2: The thin backlight module as described in Embodiment 1, further comprising one of the following components: a plurality of edge regions; a plurality of light emitting regions, each light emitting region is configured with one of the light emitting units, and each light emitting region operate independently of each other and are separated from each other by a plurality of junction areas; a light-tight sealing part is formed between the junction areas and the edge areas as well as the thin backlight module and the input module; the light guide The film also includes a plurality of through holes for accommodating the light-emitting units, so that the light source passes through the light guide film and the reflective sheet through this configuration; and the reflective sheet also includes a lower surface opposite to the upper surface.

Embodiment 3: In the thin backlight module as described in Embodiment 2, the conductive layer is arranged on one of the upper surface and the lower surface as an electric wire layer for conducting the electric power, and the first surface is A light-emitting surface facing the input module.

Embodiment 4: In the thin backlight module as described in Embodiment 2, the light-tight sealing part is formed by a light-tight glue.

Embodiment 5: In the thin backlight module as described in Embodiment 1, a light-shielding layer is formed on a part of the surface of the light guide film.

Embodiment 6: In the thin backlight module as described in Embodiment 1, the opaque structural systems are selected from one of a frame, a circuit layer, a light-shielding layer, a light-reflecting layer and combinations thereof.

Embodiment 7: In the thin backlight module as described in Embodiment 1, the collection of these opaque structures forms an opaque structure assembly, and the transparent structures are defined by the opaque structure assembly. light area.

Embodiment 8: The thin backlight module as described in Embodiment 1, the input module is one of a luminous keyboard, a luminous key and a membrane key.

Embodiment 9: The thin backlight module as described in Embodiment 1 is applied to a backlight keyboard module, a mobile phone, a smart phone, a tablet computer, a tablet phone, a keyboard protection cover, and a touch protection cover , one of a keyboard back cover, a touch back cover and a notebook computer.

Embodiment 10: A thin backlight module, which includes: a light guide film, which includes a first surface and a second surface, the first surface faces an input module, wherein the input module includes a plurality of light-transmitting A plurality of opaque structures in the area; a reflective sheet, which is arranged at a position close to the second surface, and includes an upper surface close to the light guide film; a conductive layer, which is formed on a part of the upper surface and conducting an electric power; and a plurality of light-emitting units, which are arranged on the conductive layer and receive the electric power to emit a light source, the light source is configured to pass through the light guide film and the reflective sheet, and emit from the first surface Become a light source and enter the input module, and finally emit light from the light-transmitting regions.

In short, the utility model is formed on any surface of the light-shielding film or reflective film in the backlight module, forming a thin film conductive layer as a conductive circuit, and then placing a light-emitting diode (LED) on the thin film conductive layer, It directly replaces the commonly used light source module, and at the same time uses the opaque junction in the input module to shield the light source, forming an effect equivalent to that of a shading sheet, and can directly replace the commonly used shading sheet.

Therefore, the thin backlight module of this utility model does not need to be equipped with a common light source module, nor does it need to be equipped with a light-shielding film. This structure effectively reduces the number of layers, thickness, weight and material costs of the module, improves the design flexibility of LED ornaments, and can greatly improve the overall optical efficiency. , and have the opportunity to use fewer LEDs in the backlight module, which can reduce the cost and reduce the power consumption of the module.

The utility model can be applied to various devices that need to use a backlight module to emit light, especially various mobile devices that include a backlight module, such as: notebook computers, mobile phones, smart phones, tablet computers, tablet phones, keyboard protection covers , touch protection cover, keyboard back cover, touch back cover and backlit keyboard, etc.

A thin backlight module provided by the utility model has been introduced in detail above. For those of ordinary skill in the art, according to the idea of the utility model embodiment, there will be changes in the specific implementation and application range. As mentioned above, the contents of this specification should not be construed as limiting the present utility model.

Claims (10)

1. a thin type backlight module, is characterized in that, comprising:

One light guiding film, it comprises a first surface and the second surface relative to described first surface, described first surface is towards an input module, wherein said input module comprises more than one light tight structure, defines more than one transmission region in input module described in described light tight construction;

One reflector plate, it is arranged on the position of described second surface, and comprises the upper surface near described light guiding film;

One conductive layer, on its part surface being formed at described upper surface and conduct power; And

More than one luminescence unit, described luminescence unit to be configured on described conductive layer and to be electrically connected with described conductive layer, luminescence unit described in each receives described electric power that described conductive layer provides to send light source, described light source through configuration with by described light guiding film and described reflector plate, and from the injection of described first surface and forming surface light source enters described input module, under the bridging effect of wherein said area source described light tight structure in described input module, from described transmission region, injection is luminous.

2. thin type backlight module according to claim 1, is characterized in that, also comprises:

Two or more marginal zone;

More than one luminous zone, luminous zone described in each is all configured with described luminescence unit, the running and luminous zone described in each is mutually independent, and separate by two or more junctional area;

Light tight sealing, is formed on described junctional area and described marginal zone;

Described light guiding film also comprises more than one open-work for accommodating described luminescence unit, makes described light source by described light guiding film and described reflector plate by this configuration.

3. thin type backlight module according to claim 2, is characterized in that, described reflector plate also comprises a lower surface relative to described upper surface;

Described conductive layer is arranged at described upper surface or described lower surface, using the electric lead layer as the described electric power of conduction;

Described first surface is the exiting surface of described thin type backlight module, and described exiting surface is towards described input module.

4. thin type backlight module according to claim 2, is characterized in that, described light tight sealing is the hermetically-sealed construction formed by light tight glue.

5. thin type backlight module according to claim 1, is characterized in that, the part surface of described light guiding film is formed with a light shield layer.

6. thin type backlight module according to claim 1, is characterized in that, described light tight structure comprises a framework, a circuit layer, a light shield layer, a reflector layer or its combination.

7. thin type backlight module according to claim 1, is characterized in that, the light tight structure assembly of set formation one of described light tight structure, defines described transmission region through described light tight structure assembly.

8. thin type backlight module according to claim 1, is characterized in that, described input module is an illuminated keyboard, a luminous button or a film key.

9. thin type backlight module according to claim 8, it is characterized in that, the key cap of key set of described input module is formed with transmittance section, semi light transmitting part or fluorescence portion, described area source penetrates luminous and forms luminous pattern through described transmittance section, semi light transmitting part or fluorescence portion from described transmission region.

10. thin type backlight module according to any one of claim 1 to 9; it is characterized in that, described thin type backlight module is applied to a backlight keyboard module, a mobile phone, an intelligent mobile phone, a tablet PC, a dull and stereotyped phone, a protective cover of keyboard, a touch-control over cap, a keyboard back of the body lid, touch-control back of the body lid or a notebook computer.