CN220509169U

CN220509169U - Multi-key light guide plate and backlight module

Info

Publication number: CN220509169U
Application number: CN202321903966.7U
Authority: CN
Inventors: 陈兆俞
Original assignee: Huaian Darfon Electronics Co ltd; Darfon Electronics Corp
Current assignee: Huaian Darfon Electronics Co ltd; Darfon Electronics Corp
Priority date: 2023-07-19
Filing date: 2023-07-19
Publication date: 2024-02-20
Anticipated expiration: 2033-07-19

Abstract

The utility model discloses a multi-key light guide plate which is applied to a backlight module. The second light guide body is adjacent to and separated from the first light guide body. The bridging part is provided with a first section and a second section which are bent relatively. The first section is connected between the first light guide body and the second section, and the second section is connected between the second light guide body and the first section. The bridging part is connected with the adjacent light guide bodies so that the multi-key light guide sheet can be easily assembled, and the multi-key light guide sheet is provided with a roundabout bridging part between the adjacent light guide bodies, so that the reflection and absorption times during light transmission can be effectively increased to prevent the light from being transmitted to other light guide bodies, and the design purpose of no light leakage is achieved.

Description

Multi-key light guide plate and backlight module

Technical Field

The present utility model relates to a multi-key light guide and a backlight module, and more particularly to a multi-key light guide and a backlight module capable of effectively isolating light leakage and easy to assemble.

Background

Along with the progress of technology, a touch module formed by combining a plurality of operation keys is designed on an input interface of a computer device. Referring to fig. 7, fig. 7 is a schematic diagram of a light guiding unit 70 and a light emitting unit 72 in the prior art. In order to prevent the interference light leakage between the operation keys, the conventional input interface designs the light guide sheet of the backlight module into a plurality of light guide units 70, and each light guide unit 70 is respectively disposed below the corresponding operation key and beside the corresponding light emitting unit 72; i.e. the number of operating keys corresponds to the number of light guiding units 70 and the number of light emitting units 72, respectively. The key row of the conventional input interface arranges a plurality of operation keys, and a plurality of independent light guide units 70 are required; however, the light guide units 70 are smaller and spaced apart from each other, and it is difficult to assemble the light guide units with respect to the corresponding light emitting units 72 and the adjacent light guide units 70 at a predetermined distance, so that it is one of the development goals of the related mechanism design industry to design a light guide sheet that can be easily assembled and applied to a plurality of operation keys in a stripe arrangement.

Disclosure of Invention

The present utility model provides a multi-key light guide sheet and a backlight module capable of effectively isolating light leakage and easy to assemble, so as to solve the above-mentioned problems.

In order to achieve the above-mentioned objective, the present utility model provides a multi-key light guide sheet, which comprises a first light guide body, a second light guide body and a bridging portion, wherein the second light guide body is adjacent to and separated from the first light guide body, the bridging portion has a first section and a second section which are bent relatively, the first section is connected between the first light guide body and the second section, and the second section is connected between the second light guide body and the first section.

As an alternative solution, the first section is connected to the first light guiding body in a relatively bending manner, and the second section is also connected to the second light guiding body in a relatively bending manner.

As an alternative technical scheme, the joint of the first section and the second section presents an arc structure or a bevel structure.

Alternatively, the first section is a straight section or a bent section.

As an optional solution, the multiple key light guiding plate further includes a light absorbing element disposed in at least a portion of the gap between the first light guiding body and the second light guiding body.

As an alternative solution, the bridge portion has an upper surface and a lower surface opposite to each other, and the multi-key light guide further includes a plurality of dots disposed on at least one of the upper surface and the lower surface.

As an optional technical solution, the plurality of dots are further disposed on the first light guiding body and the second light guiding body.

As an alternative technical solution, the bridge portion, the first light guiding body and the second light guiding body are made of the same material and are manufactured in an integral molding manner.

The utility model also provides a backlight module which comprises the multi-key light guide plate and at least one light-emitting element.

As an alternative technical scheme, the backlight module further comprises a light shielding element, the light shielding element is arranged on the upper surface and/or the lower surface of the multi-key light guide sheet, and a light absorption coating is arranged on the surface of the light shielding element facing the multi-key light guide sheet.

As an alternative technical scheme, the surface of the shading element facing the multi-key light guide sheet is also coated with a water glue layer.

The multi-key light guide plate and the backlight module comprise a multi-key light guide plate with a plurality of light guide bodies and bridging parts. The light guide bodies are adjacent to each other and have intervals, and the bridging part is connected with the adjacent light guide bodies so that the multi-key light guide sheet can be easily assembled. The bridging part is further divided into a plurality of sections which are bent relatively, and the bridging part is connected to the light guide body in a relatively bending manner. Therefore, the multi-key light guide sheet is provided with the roundabout bridging part between the adjacent light guide bodies, so that the reflection and absorption times during light transmission can be effectively increased to block the light from being transmitted to other light guide bodies, and the design purpose of no light leakage is achieved.

The utility model will now be described in more detail with reference to the drawings and specific examples, which are not intended to limit the utility model thereto.

Drawings

FIG. 1 is a side view of a structure of an input device provided by the present utility model;

FIG. 2 is a schematic diagram of a multi-key lightguide according to a first embodiment of the present utility model;

FIG. 3 is a schematic diagram of a multi-key lightguide according to a second embodiment of the present utility model;

FIG. 4 is a schematic diagram of a multi-key lightguide according to a third embodiment of the present utility model;

FIG. 5 is a schematic diagram of a multi-key lightguide according to a fourth embodiment of the present utility model;

FIG. 6 is a schematic diagram of a multi-key lightguide according to another embodiment of the present utility model;

fig. 7 is a schematic diagram of a light guiding unit and a light emitting unit in the prior art.

Detailed Description

For a further understanding of the objects, construction, features and functions of the utility model, reference should be made to the following detailed description of the preferred embodiments.

Referring to fig. 1, fig. 1 is a side view of an input device 10 according to the present utility model. The input device 10 may be a touch panel or a touch device with similar functions. The input device 10 includes a backlight module 12 and an input interface 14. The input interface 14 may be various types of touch interfaces, which are not described in detail herein. The backlight module 12 may optionally include a circuit board 16, a light emitting element 18, and a light guide 20. The light emitting element 18 may be disposed on the circuit board 16. The light guide 20 is located beside the light emitting element 18 to provide a side-in backlight function. In addition, a reflective layer 24 may be optionally disposed between the light guide 20 and the circuit board 16. A masking layer 26 may also be optionally disposed between the backlight module 12 and the input interface 14. The shielding layer 26 has a light-transmitting region 261 and a light-shielding region 262, in one embodiment, the shielding layer 26 may comprise a transparent film, and the light-shielding region 262 is formed by printing black or dark ink on the upper surface or the lower surface of the transparent film, wherein the region of the transparent film on which the black or dark ink is not printed is the light-transmitting region 261; however, the practical application is not limited thereto. The element configuration of the input device 10 is not limited to the foregoing embodiment, and may be determined depending on the design requirements.

The light guide 20 may be a multi-key light guide, that is, the multi-key light guide 20 may be matched with a plurality of operation buttons applied to the input interface 14, so the multi-key light guide 20 may have a plurality of light guide bodies respectively disposed at positions corresponding to the operation buttons, and the plurality of light guide bodies are respectively aligned with the plurality of light emitting elements 18; each light emitting element 18 may be a single color or multi-color light emitting unit. In addition, in order to meet the design requirement of connecting a plurality of light guide bodies and isolating the light interference of the adjacent operation buttons, the present utility model further utilizes the air isolation and bridging design, so that the multi-key light guide 20 can be applied to the backlight module 12 and the input device 10 to effectively isolate the light leakage between the operation buttons.

Referring to fig. 2, fig. 2 is a schematic diagram of a multi-key light guide 20 according to a first embodiment of the present utility model. The multi-key light guide 20 may include at least a first light guide body 28, a second light guide body 30, and a bridge portion 32. The second light guiding body 30 is adjacent to and spaced apart from the first light guiding body 28. The bridge portion 32 may be connected between the first light guiding body 28 and the second light guiding body 30. The width of the bridge 32 is, for example, 0.1 mm to 2 mm. In this embodiment, each light guiding body has a circular structure, but in other embodiments, the light guiding body is not limited to this, and may be designed into a rectangular structure, a diamond structure, a polygonal structure, etc. according to the requirements. The multi-key lightguide 20 may optionally further have a dot region 22, where the dot region 22 is disposed on the first lightguide 28 and/or the second lightguide 30 for directing light to illuminate the corresponding symbol 141 on the input interface 14. The dot area 22 may be selectively disposed on the top surface or the bottom surface of the first light guiding body 28 and/or the second light guiding body 30, and the structure thereof may be micro-prism or white dot-shaped printing, but the practical application is not limited thereto. In an embodiment, the bridge portion 32, the first light guiding body 28 and the second light guiding body 30 are made of the same material and are integrally formed, but the practical application is not limited thereto. The number and connection positions of the first light guiding body 28, the second light guiding body 30 and the bridging portion 32 are not limited to the embodiment shown in the drawings, and may depend on the size of the backlight module 12 or the number of the plurality of operation buttons of the input interface 14. For example, the multi-key light guide 20 is made of a light guide material, and the characteristics of the light guide material determine the overall length of the multi-key light guide 20, so as to reduce or avoid the structural deformation of the multi-key light guide 20 caused by the elongation of the bridge portion 32.

The bridge portion 32 may have a first section 34 and a second section 36 that are bent relatively. The first section 34 may be coupled between the first light guiding body 28 and the second section 36, and the second section 36 may be coupled between the second light guiding body 30 and the first section 34. As shown in fig. 2, the bridge portion between the adjacent light guiding bodies 30 is designed into a bent shape, such as a C-shaped structure or a semicircular structure, or an S-shaped structure, a W-shaped structure, an M-shaped structure or a concave-convex structure, etc., for increasing the number of times of absorption and reflection of the light in the bridge portion 32, so as to block the light outputted from each light emitting element 18 from being guided to other light guiding bodies not corresponding to the light emitting element. Taking the first light guiding body 28 and the second light guiding body 30 adjacent to each other as an example, the bridge portion 32 between the first light guiding body 28 and the second light guiding body 30 is designed to be in a bent shape, so that the light entering the first light guiding body 28 can be prevented from being guided to the second light guiding body 30, and the light entering the second light guiding body 30 can be prevented from being guided to the first light guiding body 28.

In addition to the first section 34 and the second section 36 being relatively bent structures, the multi-key light guide 20 further connects the first section 34 to the first light guide body 28 in a relatively bendable manner, and connects the second section 36 to the second light guide body 30 in a relatively bendable manner. In other words, the connection between the first section 34 and the first light guiding body 28 (or between the second section 36 and the second light guiding body 30) may be an arc structure or a hook structure, which can effectively increase the absorption and reflection times of the light in the first section 34 (or between the second section 36) so as to block the light outputted by each light emitting element 18 from being guided to other light guiding bodies not corresponding to the light emitting elements.

In addition, the connection between the first section 34 and the second section 36 may also have an arc structure, as shown in fig. 2, which can increase the absorption and reflection times of the light transmitted between the first section 34 and the second section 36; however, the junction of the first section 34 and the second section 36 is not limited to the foregoing embodiments. Referring to fig. 3, fig. 3 is a schematic diagram of a multi-key light guide 20A according to a second embodiment of the present utility model. In the embodiments of the present utility model, elements having the same numbers as those of the other embodiments have the same structure and function, and the description thereof will not be repeated. As shown in fig. 3, the junction between the first section 34A and the second section 36A of the multi-key light guide 20A presents a corner structure for increasing the absorption and reflection times of the light transmitted between the first section 34A and the second section 36A.

As shown in fig. 2 and 3, the first section 34 and the second section 36 (or the first section 34A and the second section 36A) are both bending sections, so as to increase the absorption and reflection times of the light transmitted in each section; however, the practical application is not limited thereto. Referring to fig. 4, fig. 4 is a schematic diagram of a multi-key light guide 20B according to a third embodiment of the present utility model. As shown in fig. 4, the first section 34B and the second section 36B of the multi-key light guide 20B are both straight sections; as long as the junction between the first section 34B and the first light guiding body 28, the junction between the first section 34B and the second section 36B, and the junction between the second section 36B and the second light guiding body 30 are arc-shaped structures or angle-folded structures, the absorption and reflection times of the light rays during the transmission between the first light guiding body 28 and the second light guiding body 30 can be increased.

Furthermore, as shown in fig. 2 to 4, the first section 34 and the second section 36 (or the first section 34A and the second section 36A, or the first section 34B and the second section 36B) are substantially located outside the gap between the first light guiding body 28 and the second light guiding body 30, that is, a gap is formed between the adjacent light guiding bodies, and each of the first section and the second section is located (or is approximately located) outside the gap in the direction perpendicular to the arrangement direction of each of the light guiding bodies; however, the practical application is not limited thereto. Referring to fig. 5, fig. 5 is a schematic diagram of a multi-key light guide 20C according to a fourth embodiment of the present utility model. The first section 34C and the second section 36C of the multi-key light guide 20C may be straight sections or bent sections, and the joints thereof may have an arc structure or a corner structure, and may be connected to the first light guide body 28 and the second light guide body 30 respectively in a relatively bent manner, so as to extend into the gap between the first light guide body 28 and the second light guide body 30.

Referring to fig. 2, the multi-key light guide 20 may further include a light absorbing element 38, and the light absorbing element 38 is disposed in the gap between the first light guide body 28 and the second light guide body 30. The light output by the light emitting element 18 increases the number of times of light absorption and reflection due to the detour path of the bridge portion 32, so as to block the light from being guided to other light guiding bodies; the light absorption element 38 can be used to fill the gap between the adjacent first light guiding body 28 and second light guiding body 30, so as to further improve the light leakage isolation effect of the multi-key light guiding plate 20. The material of the light absorbing element 38 can be determined according to design requirements; the light absorbing element 38 may completely fill the gap between the first light guiding body 28 and the second light guiding body 30, or may partially fill the gap with little gaps, depending on the isolated light leakage intensity of the multi-key light guiding sheet 20.

Referring to fig. 6, fig. 6 is a schematic diagram of a multi-key light guide 20' according to another embodiment of the present utility model. The shape of the bridge 32 of the present utility model is not particularly limited, so the shape of the bridge 32 shown in fig. 6 is slightly different from the embodiment shown in the foregoing, and the bridge 32 according to the foregoing description can be applied to the multiple key light guide 20'. Bridge 32 has opposite upper and lower surfaces 40, 42. The multiple key light guide 20' may have a plurality of dots 44 coated or formed on the upper surface 40 and/or the lower surface 42 for the purpose of disrupting the total reflection characteristics of the light to prevent light spillage. Accordingly, the multiple key light guide 20' may also selectively coat or form the plurality of dots 44 on the upper and lower surfaces of the first light guide body 28 and/or the second light guide body 30. The material properties, distribution density, and floral pattern of dots 44 are not limited to the illustrated embodiment.

In order to further improve the effect of the bridging portion 32 in preventing the light from leaking, the light shielding element 46 may be disposed on the upper surface and/or the lower surface of the multi-key light guiding sheet 20', as shown in fig. 6, in this embodiment, the light shielding element 46 is disposed on the upper surface 40 and the lower surface 42 of the bridging portion 32, respectively. The light shielding element 46 is made of light shielding or light absorbing material; optionally, a light-absorbing coating 48 may be additionally disposed on the surface of the light-shielding element 46 facing the bridge portion 32, so as to further enhance the light-shielding effect of the light-shielding element 46. In addition, the present utility model may further apply a glue layer 50 on the surface of the light shielding element 46 facing the bridge portion 32, so as to ensure that the light shielding element 46 can be closely adhered to the bridge portion 32.

In summary, the backlight module of the present utility model includes a multi-key light guide having a plurality of light guide bodies and a bridging portion. The light guide bodies are adjacent to each other and have intervals, and the bridging part is connected with the adjacent light guide bodies so that the multi-key light guide sheet can be easily assembled. The light guide body can be designed into a rectangular structure, a diamond structure, a round structure, a polygonal structure and the like. The bridge may be designed in various patterns, such as a C-shaped structure, an S-shaped structure, a W-shaped structure, an M-shaped structure, or a concave-convex structure. The bridging part is further divided into a plurality of sections which are bent relatively, and the bridging part is connected to the light guide body in a relatively bending manner. Therefore, the multi-key light guide sheet designs a roundabout bridging part between the adjacent light guide bodies, the width of the bridging part is about 0.1 to 2 millimeters, and the reflection and absorption times during light transmission can be effectively increased to block the light from being transmitted to other light guide bodies, so that the design purpose of no light leakage is achieved.

Of course, the present utility model is capable of other various embodiments and its several details are capable of modification and variation in light of the present utility model by one skilled in the art without departing from the spirit and scope of the utility model as defined in the appended claims.

Claims

1. A multiple key lightguide comprising:

a first light guide body;

a second light guide body adjacent to and separated from the first light guide body; and

the bridging part is provided with a first section and a second section which are oppositely bent, the first section is connected between the first light guide body and the second section, and the second section is connected between the second light guide body and the first section.

2. The light guide plate of claim 1, wherein the first section is connected to the first light guide body in a relative bending manner, and the second section is also connected to the second light guide body in a relative bending manner.

3. The multi-key lightguide of claim 1, wherein the junction of the first section and the second section is an arc or a corner structure.

4. The multi-key lightguide of claim 1, wherein the first section is a straight section or a bent section.

5. The multiple key light guide of claim 1, further comprising:

and the light absorption element is arranged in at least part of the gap between the first light guide body and the second light guide body.

6. The multi-key lightguide of claim 1, wherein the bridge portion has an upper surface and a lower surface opposite to each other, and the multi-key lightguide further comprises a plurality of dots disposed on at least one of the upper surface and the lower surface.

7. The multi-key lightguide of claim 6, wherein the plurality of dots are further disposed on the first lightguide body and the second lightguide body.

8. The light guide plate of claim 1, wherein the bridge portion, the first light guide body and the second light guide body are made of the same material and are integrally formed.

9. A backlight module comprising the multiple key light guide of any one of claims 1-8 and at least one light emitting element.

10. The backlight module according to claim 9, further comprising a light shielding element disposed on an upper surface and/or a lower surface of the multi-key light guide, wherein a light absorbing coating is disposed on a surface of the light shielding element facing the multi-key light guide.

11. The backlight module of claim 10, wherein a surface of the light shielding element facing the multi-key light guide is further coated with a glue layer.