Backlight module and luminous touch device thereof

Abstract

The present invention discloses a backlight module and a light-emitting touch device thereof, wherein the light-emitting touch device comprises: a circuit board, a backlight module and a cover plate. The backlight module comprises a light guide plate, a light source assembly and a shading strip. The light guide plate comprises a first plate body and a second plate body which are interlocked with each other. The first plate body has a plurality of first microstructures, and the second plate body has a plurality of second microstructures. The shading strip is located at the outer periphery of the light guide plate and extends to the junction between the first plate body and the second plate body to block the penetration of light between the first plate body and the second plate body. The cover plate comprises a first light-transmitting area and a second light-transmitting area corresponding to the first microstructure and the second microstructure, respectively.

Description

Technical Field

[0001] The present invention relates to a backlight module and a light-emitting touch device thereof, and in particular to a backlight module suitable for partition display and a light-emitting touch device thereof. Background Art

[0002] Traditional electronic products such as notebook computers usually have physical buttons and touch panels. As portable electronic products become thinner, the available space on the body is relatively reduced. Therefore, thin and light notebook computers may display virtual buttons and visual images on the touch panel to save physical button space and improve user convenience. That is, virtual buttons and visual images are displayed on the touch panel through a backlight module for user operation.

[0003] In a specific application scenario, the virtual buttons and visual images displayed by the light-emitting touch device can be, for example, but not limited to, a computer function menu that is adjusted in sections, and display the corresponding status. For example, the light-emitting touch device can display several volume indicator lights in sections, for example: when 1 volume symbol is displayed for the user to view / click, it means that the current speaker volume is low, however, when 7 volume symbols are displayed for the user to view / click, it means that the current fan speed / speaker volume is high, and the user can adjust the speaker volume in sections by touching.

[0004] However, the inventors realize that the general luminous touch device only lights up all the luminous parts or turns off all the luminous parts, such as but not limited to: backlighting or side-entry lighting, to light up the entire area of ​​the touch panel, but it is still impossible to display virtual buttons and visual images in partitions. Even if each light-emitting element can be independently controlled and lit up separately, there are still problems of adjacent light interference and afterimages, which cause afterimages to mislead users. In view of this, the inventors have devoted themselves to research and finally developed the backlight module and luminous touch device of the present case to overcome the shortcomings of the prior art. Summary of the invention

[0005] The main purpose of the present invention is to provide a backlight module and a light-emitting touch device thereof, in particular, a backlight module and a light-emitting touch device thereof suitable for partition display.

[0006] To achieve the above-mentioned purpose, the present invention provides a backlight module suitable for electrically connecting to a circuit board. The backlight module includes a light guide plate, a light source assembly and a shading strip. The light guide plate includes a first plate body and a second plate body that are interlocked with each other. The first plate body includes a plurality of first blocks and a plurality of first openings aligned with the plurality of first blocks. The second plate body includes a plurality of second blocks and a plurality of second openings aligned with the plurality of second blocks. The plurality of first blocks have a plurality of first microstructures, and the plurality of second blocks have a plurality of second microstructures. The light source assembly is electrically connected to the circuit board. The light source assembly includes a plurality of first light-emitting components and a plurality of second light-emitting components that are arranged oppositely and staggered. Each first light-emitting component has a first light-emitting surface. Each second light-emitting component has a second light-emitting surface. The plurality of first light-emitting components protrude from the plurality of first openings respectively and face the plurality of first blocks with the first light-emitting surfaces, and the plurality of second light-emitting components protrude from the plurality of second openings respectively and face the plurality of second blocks with the second light-emitting surfaces. The shading strip is located at the outer periphery of the light guide plate and extends to a junction between the first plate body and the second plate body to block the penetration of light between the first plate body and the second plate body.

[0007] According to some embodiments of the present invention, a light-emitting touch device includes a circuit board, a backlight module and a cover plate. The circuit board includes a touch circuit. The backlight module includes a light guide plate, a light source assembly and a shading strip. The backlight module includes a light guide plate, a light source assembly and a shading strip. The light guide plate includes a first plate body and a second plate body that are interlocked with each other. The first plate body includes a plurality of first blocks and a plurality of first openings aligned with the plurality of first blocks. The second plate body includes a plurality of second blocks and a plurality of second openings aligned with the plurality of second blocks. The plurality of first blocks have a plurality of first microstructures, and the plurality of second blocks have a plurality of second microstructures. The light source assembly is electrically connected to the circuit board. The light source assembly includes a plurality of first light-emitting elements and a plurality of second light-emitting elements that are arranged oppositely and staggered. Each first light-emitting element has a first light-emitting surface. Each second light-emitting element has a second light-emitting surface. The plurality of first light-emitting elements protrude from the plurality of first openings respectively and face the plurality of first blocks with the first light-emitting surfaces, and the plurality of second light-emitting elements protrude from the plurality of second openings respectively and face the plurality of second blocks with the second light-emitting surfaces. The light shielding strip is located at the outer periphery of the light guide plate and extends to the junction between the first plate body and the second plate body to block the penetration of light between the first plate body and the second plate body. The cover plate is located on the light guide plate. The cover plate includes a plurality of first light-transmitting areas and a plurality of second light-transmitting areas corresponding to the plurality of first microstructures and the plurality of second microstructures, respectively.

[0008] According to some embodiments of the present invention, there are multiple first accommodating spaces corresponding to the multiple second blocks between the multiple first blocks, there are multiple second accommodating spaces corresponding to the multiple first blocks between the multiple second blocks, and the shading strip is in a continuous S shape at the junction of the first plate and the second plate.

[0009] According to some embodiments of the present invention, when at least one of the plurality of first light emitting elements is driven, it is used to emit a first light toward the first block. When at least one of the plurality of second light emitting elements is driven, it is used to emit a second light toward the second block. The first light is blocked by the shading strip located at the junction and does not enter the second block, and the second light is blocked by the shading strip located at the junction and does not enter the first block.

[0010] According to some embodiments of the present invention, the first block and the second block respectively have a plurality of light-concentrating microstructures parallel to the first light-emitting surface and the second light-emitting surface, and the light-concentrating microstructures include V-shaped grooves and arc grooves.

[0011] According to some embodiments of the present invention, the light guide plate has a plurality of matte microstructures between the plurality of first openings and between the plurality of second openings.

[0012] According to some embodiments of the present invention, a plurality of light absorbing regions are provided on the circuit board, adjacent to the plurality of first light emitting surfaces and the plurality of second light emitting surfaces.

[0013] According to some embodiments of the present invention, a reflector is further included. The reflector is located between the circuit board and the light guide plate. The reflector includes a plurality of third openings. The orthographic projections of the plurality of third openings on the light guide plate overlap the plurality of first openings and the plurality of second openings. The plurality of first light-emitting elements and the plurality of second light-emitting elements are located in the plurality of third openings and protrude from the reflector.

[0014] According to some embodiments of the present invention, the first light-transmitting area and the second light-transmitting area are located on the same central axis and are bilaterally symmetrical.

[0015] Thus, according to some embodiments, the backlight module and its light-emitting touch device use a shading strip extending and distributed at the junction between the first plate and the second plate to block the penetration of light between the first plate and the second plate, and prevent any microstructure from being mistakenly illuminated by light from the adjacent plate and generating residual images. That is, when any light-emitting element is partitioned / individually lit, the block where the unlit light-emitting element is located can avoid simultaneous display, thereby improving the problem of adjacent light interference and residual images, so that each block can independently display a predetermined pattern, which is convenient for users to view / touch operation.

[0016] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments, but is not intended to limit the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic exploded perspective view of a light emitting touch device according to an embodiment;

[0018] Figure 2 is a top exploded schematic diagram of a backlight module according to an embodiment;

[0019] Figure 3is a schematic top view of a backlight module according to an embodiment;

[0020] Figure 4a is a schematic top view of a backlight module according to another embodiment;

[0021] Figure 4b is a top view schematic diagram of a backlight module according to yet another embodiment;

[0022] Figure 5 FIG. 1 is a partially enlarged top view of a backlight module according to an embodiment of the present invention.

[0023] Among them, the reference numerals

[0024] L1: First light

[0025] L2: Second light

[0026] 1: Circuit board

[0027] 10: Touch circuit

[0028] 2: Backlight module

[0029] 20: Light guide plate

[0030] 200: First plate

[0031] 2000: First Block

[0032] 2002: First opening

[0033] 2004: First Microstructure

[0034] 202: Second plate

[0035] 2020: Block 2

[0036] 2022: Second opening

[0037] 2024: Second Microstructure

[0038] 204: first accommodation space

[0039] 206: Second accommodating space

[0040] 208: Light-focusing microstructure

[0041] 212: light absorption area

[0042] 210: Matt microstructure

[0043] 22: Light source components

[0044] 220: first light emitting element

[0045] 2200: First light emitting surface

[0046] 222: Second light emitting element

[0047] 2220: Second light-emitting surface

[0048] 24: shading strip

[0049] 240: Junction

[0050] 28: Reflective sheet

[0051] 280: The third opening

[0052] 3: Cover

[0053] 30: First light transmission area

[0054] 32: Second light transmission area DETAILED DESCRIPTION

[0055] The following will describe in detail various embodiments of the present invention, and will be illustrated with accompanying drawings. In the description of the specification, many specific details are provided in order to give the reader a more complete understanding of the present invention; however, the present invention may still be implemented under the premise of omitting some or all of the specific details. The same or similar elements in the drawings will be represented by the same or similar symbols. It is particularly noted that the drawings are for illustration purposes only and do not represent the actual size or quantity of the elements. Some details may not be fully drawn to simplify the drawings.

[0056] Figure 1 FIG. 1 is a schematic exploded perspective view of a light-emitting touch device according to an embodiment of the present invention. Figure 2 FIG. 1 is a top exploded schematic diagram of a backlight module according to an embodiment. Figure 3 FIG. 4 is a schematic top view of a backlight module according to an embodiment.

[0057] Please refer to Figures 1 to 3 According to some embodiments of the present invention, a light-emitting touch device includes a circuit board 1 , a backlight module 2 and a cover plate 3 .

[0058] In some embodiments, the luminous touch device is a multifunctional touch panel that combines a touch panel and a backlight module, and has at least three operation modes: (i) in the general mode, when the multi-layer luminous touch device is not luminous, it is black, which is no different from a general touch panel, and can be used to manipulate the mouse cursor, click to select and control; (ii) in the full-area lighting mode, the luminous touch device can display all virtual keys and visual images for the user to view; (iii) in the partition display mode, the luminous touch device can selectively display some virtual keys and / or visual images, such as but not limited to: displaying virtual keys such as selectable system functions (such as volume, fan speed, screen brightness, keyboard brightness or software joystick) in the peripheral area, and displaying operation images such as the working status of the selected function in the central area. Take the above-mentioned notebook computer application as an example, the controller of the notebook computer will process the corresponding virtual key / operation image being pressed according to the touch signal returned by the luminous touch device, for example: the user first selects the volume virtual key of the system function, and then adjusts the corresponding parameter value of the system function by touching the operation image, thereby adjusting the volume of the notebook computer speaker. In some embodiments, the luminous touch device is used to display the aforementioned operation image for the user to visually confirm the current working status of the hardware / software, but has no corresponding touch function.

[0059] The circuit board 1 includes a touch circuit 10. In some embodiments, the circuit board 1 is a flexible printed circuit board (Flexible Printed Circuit Board); for example, the circuit board 1 is a glass fiber (FR4 / FR5 / FRP) printed circuit board.

[0060] The backlight module 2 is located on the circuit board 1. The backlight module 2 includes a light guide plate 20, a light source assembly 22 and a light shielding strip 24. The light guide plate 20 is located on the circuit board 1. The light guide plate 20 includes a first plate body 200 and a second plate body 202 that are interlocked with each other, for example but not limited to, the outer edges of the two relative profiles are concave and convex shapes, and are interlocked with each other.

[0061] like Figure 2 As shown, the first plate 200 has a plurality of first blocks 2000 extending toward the second plate 202, wherein the plurality of first blocks 2000 are separated from each other and arranged side by side. The first plate 200 also has a plurality of first openings 2002 penetrating the plate along the thickness direction, wherein each first opening 2002 is aligned with each first block 2000. That is, the first plate 200 includes a plurality of first blocks 2000 and a plurality of first openings 2002 aligned with the plurality of first blocks 2000.

[0062] The second plate 202 has a plurality of second blocks 2020 extending toward the first plate 200, wherein the plurality of second blocks 2020 are separated from each other and arranged side by side. The second plate 202 also has a plurality of second openings 2022 penetrating the plate along the thickness direction, wherein each second opening 2022 is aligned with each second block 2020. That is, the second plate 202 includes a plurality of second blocks 2020 and a plurality of second openings 2022 aligned with the plurality of second blocks 2020.

[0063] like Figure 2 As shown, the light source assembly 22 is electrically connected to the circuit board 1. The light source assembly 22 includes a plurality of first light emitting elements 220 and a plurality of second light emitting elements 222 that are oppositely and staggeredly arranged. In some embodiments, the first light emitting elements 220 and / or the second light emitting elements 222 may be, but are not limited to, light emitting diode elements.

[0064] Each first light emitting element 220 has a first light emitting surface 2200 for emitting the first light L1. The first light emitting elements 220 protrude from the first openings 2002 respectively, and the first light emitting surfaces 2200 of the first light emitting elements 220 face the first blocks 2000, so that the first light L1 is incident into the first blocks 2000 and generates total reflection.

[0065] Each second light emitting element 222 has a second light emitting surface 2220 for emitting a second light beam L2. The second light emitting elements 222 protrude from the second openings 2022 respectively, and the second light emitting surfaces 2220 of the second light emitting elements 222 face the second blocks 2020, so that the second light beam L2 is incident on the second blocks 2020 to generate total reflection.

[0066] Each first block 2000 has a first microstructure 2004, and each second block 2020 has a second microstructure 2024. Thus, the first plate 200 receives the first light L1 emitted by the first light emitting element 220, so that the first light L1 enters the first plate 200 for total reflection, and the first light L1 is scattered when encountering the first microstructure 2004 to produce a predetermined light effect; the second plate 202 receives the second light L2 emitted by the second light emitting element 222, so that the second light L2 enters the second plate 202 for total reflection, and the second light L2 is scattered when encountering the second microstructure 2024 to produce a predetermined light effect.

[0067] In some embodiments, the first microstructure 2004 / the second microstructure 2024 is composed of a plurality of dots (or dots, light dots), which may be convex dots or concave dots, but are not limited thereto, and may be any shape, such as irregular shape, cone, square, triangle, trapezoid, etc. In some examples, the dots may be concave dots that are inwardly recessed from the bottom surface of the first block 2000 / the second block 2020, or may be convex dots that protrude outwardly from the bottom surface of the first block 2000 / the second block 2020. The shape, size, spacing between adjacent convex dots, and / or spacing between concave dots of each dot may be adjusted according to the light type emitted by the first light-emitting element 220 / the second light-emitting element 222, the shape of the first light-transmitting area 30 / the second light-transmitting area 32 when viewed from above, the bottom surface material of the first block 2000 / the second block 2020 and its surface roughness, etc. The above adjustments may be conducted through experiments to obtain a better design solution. In some embodiments, the first microstructure 2004 / the second microstructure 2024 may also be realized by printing dots or lines formed by ink on the bottom surface of the first block 2000 / the second block 2020 .

[0068] The light shielding strip 24 is located at the outer periphery of the light guide plate 20. For example, the light shielding strip 24 surrounds the four sides of the light guide plate 20. Here, the light shielding strip 24 can be used to prevent the first light L1 / second light L2 emitted by the light source assembly 22 from leaking out, thereby avoiding light leakage. In addition, the light shielding strip 24 extends and is distributed at the junction 240 between the first plate 200 and the second plate 202. In this way, the light shielding strip 24 blocks the penetration of light between the first plate 200 and the second plate 202, that is, ambient light, the first light L1 and the second light L2 will not penetrate the junction 240 and enter the first block 2000 and the second block 2020. Specifically, the light shielding strip 24 extending from the outer edge to the junction 240 can block the first light L1 emitted by the first light emitting element 220 in the first block 2000 from being incident on the adjacent second block 2020, thereby preventing the second microstructure 2024 of the second block 2020 from being mistakenly illuminated by the first light L1 and generating afterimages. In some embodiments, the material of the light shielding strip 24 can be a light-proof or light-absorbing plastic, such as but not limited to: polycarbonate (PC).

[0069] Furthermore, when at least one of the plurality of first light emitting elements 220 is driven, the first light emitting element 220 emits a first light L1 toward the first block 2000. When at least one of the plurality of second light emitting elements 222 is driven, the second light emitting element 222 emits a second light L2 toward the second block 2020. Here, the first light L1 is blocked by the light shielding strip 24 located at the junction 240 and does not enter the second block 2020, and the second light L2 is blocked by the light shielding strip 24 located at the junction 240 and does not enter the first block 2000.

[0070] Please come back Figure 1 ,like Figure 1 As shown, the cover plate 3 is located on the light guide plate 20. The cover plate 3 includes a plurality of first light-transmitting areas 30 and a plurality of second light-transmitting areas 32, and the plurality of first light-transmitting areas 30 and the plurality of second light-transmitting areas 32 correspond to the plurality of first microstructures 2004 and the plurality of second microstructures 2024, respectively. Thus, the first light L1 scattered by the first microstructure 2004 will penetrate the first light-transmitting area 30, and the second light L2 scattered by the second microstructure 2024 will penetrate the second light-transmitting area 32, and a predetermined pattern will be displayed, which can be viewed / touch-operated by the user from above the cover plate 3. For example, when the first light-emitting element 220 is partitioned / lighted separately, the second block 2020 where the second light-emitting element 222 that is not lit is located can avoid simultaneous display, thereby improving the problem of adjacent light interference and afterimage, so that each first block 2000 and the second block 2020 can independently display the predetermined pattern. In some embodiments, the surface of the cover plate 3 is smoothed or / and hardened to facilitate user touch and / or improve wear resistance. In some embodiments, the material of the cover plate 3 may be but is not limited to a transparent or translucent material, such as but not limited to glass or a film such as Mylar.

[0071] According to the above structure, the backlight module 2 and its light-emitting touch device use the light shielding strip 24 to extend and distribute at the junction 240 between the first plate 200 and the second plate 202, so as to block the penetration of light between the first plate 200 and the second plate 202, and prevent any microstructure from being mistakenly illuminated by light from the adjacent plate and generating residual images. That is, when any light-emitting element is partitioned / lit individually, the block where the unlit light-emitting element is located can avoid simultaneous display, thereby improving the problem of adjacent light interference and residual images, so that each block can independently display a predetermined pattern, which is convenient for users to view / touch operation.

[0072] In some embodiments, Figure 1 As shown, the first light-transmitting area 30 and the second light-transmitting area 32 are located on the same central axis (not shown), wherein the central axis is parallel to the arrangement direction of the plurality of first light-emitting elements 220, and the central axis is located between the first light-emitting element 220 and the second light-emitting element 222. In some embodiments, as Figure 3 As shown, the first microstructure 2004 and the second microstructure 2024 are symmetrical with respect to the central axis and are located on the central axis. In one example, a plurality of first microstructures 2004 and a plurality of second microstructures 2024 are arranged alternately on the central axis, and the area sizes of the plurality of first microstructures 2004 and the plurality of second microstructures 2024 are gradually changed to determine the displayed predetermined pattern, but this is not limited thereto.

[0073] Please refer to Figure 4aIn some embodiments, the first microstructure 2004 and the second microstructure 2024 are located on the same central axis, but have an asymmetric geometric shape relative to the central axis. Figure 4b In some embodiments, a plurality of first microstructures 2004 and a plurality of second microstructures 2024 are arranged alternately on the central axis, and the areas of the plurality of first microstructures 2004 and the plurality of second microstructures 2024 are the same, and the displayed predetermined pattern is determined by a plurality of first light-transmitting regions 30 and a plurality of second light-transmitting regions 32.

[0074] Please go back Figure 2 In some embodiments, a plurality of first accommodating spaces 204 are provided between the plurality of first blocks 2000, and the plurality of first accommodating spaces 204 correspond to the plurality of second blocks 2020. A plurality of second accommodating spaces 206 are provided between the plurality of second blocks 2020, and the plurality of second accommodating spaces 206 correspond to the plurality of first blocks 2000. Thus, the first plate 200 and the second plate 202 are interlocked with each other to form the light guide plate 20. In one example, the central axis of each first block 2000 is collinear with the central axis of each second accommodating space 206, the central axis of each second block 2020 is collinear with the central axis of each first accommodating space 204, and the plurality of first blocks 2000 and the plurality of second blocks 2020 are staggered and interlocked with each other. In some embodiments, the light shielding strip 24 is in a continuous S-shape at the junction 240 of the first plate 200 and the second plate 202, but is not limited thereto.

[0075] Please also refer to Figure 1 and Figure 2 In some embodiments, the area of ​​the first microstructure 2004 is larger than the area of ​​the first light-transmitting area 30, and the area of ​​the second microstructure 2024 is larger than the area of ​​the second light-transmitting area 32. Thus, the first light L1 emitted by the first light-emitting element 220 is reduced in intensity by the scattering effect of the second microstructure 2024, and the second light L2 emitted by the second light-emitting element 222 is reduced in intensity by the scattering effect of the first microstructure 2004, thereby preventing the first light L1 from reaching the adjacent first block 2000 through total reflection, and also preventing the second light L2 from reaching the adjacent second block 2020 through total reflection, so as to improve the problem of adjacent light interference and afterimage.

[0076] Please continue to refer to Figure 3In some embodiments, the first plate 200 has a plurality of matte microstructures 210 between the plurality of first openings 2002, and the second plate 202 also has a plurality of matte microstructures 210 between the plurality of second openings 2022. That is, the light guide plate 20 has a plurality of matte microstructures 210 between the plurality of first openings 2002 and between the plurality of second openings 2022. Thereby, the multiple matt microstructures 210 scatter the first light L1 and destroy the total reflection of the first light L1 between the multiple first openings 2002, thereby preventing the first light L1 from the first block 2000 from reaching the adjacent first block 2000 through total reflection, or helping to weaken the light intensity value of the first light L1 when it reaches the adjacent first block 2000; the multiple matt microstructures 210 scatter the second light L2 and destroy the total reflection of the second light L2 at the multiple second openings 2022, thereby preventing the second light L2 from the second block 2020 from reaching the adjacent second block 2020 through total reflection, or helping to weaken the light intensity value of the second light L2 when it reaches the adjacent second block 2020. Here, the multiple matt microstructures 210 are used to produce a dimming effect to prevent the first light L1 / second light L2 from propagating across zones and generating afterimages.

[0077] In some embodiments, the matt microstructure 210 is composed of a plurality of dots (or called dots, light spots), which may be convex dots or concave dots, but are not limited thereto, and may be any shape, such as irregular shapes, cones, squares, triangles, trapezoids, etc. In some embodiments, the matt microstructure 210 may also be realized by dots or mesh lines formed by printing ink on the bottom surface of the first plate 200 / the second plate 202. In this way, the light guide plate 20 absorbs the residual light energy outside the independent light-emitting area by covering the paths where the light energy may be conducted, so as to avoid affecting the remaining light-emitting areas.

[0078] In some embodiments, the backlight module 2 further includes a light absorbing layer (not shown). The light absorbing layer is located on at least one of the surface and the bottom surface of the light guide plate 20. In one exemplary embodiment, the light absorbing layer and the plurality of extinction microstructures 210 correspond to the non-functional area of ​​the backlight module 2. Thereby, the light absorbing layer absorbs the first light L1 / the second light L2 from any first block 2000 / the second block 2020 or weakens the light intensity value of the first light L1 / the second light L2 to prevent the first light L1 / the second light L2 from reaching the adjacent first block 2000 / the second block 2020 by reflection, that is, the light absorbing layer is used as a light reduction structure between adjacent blocks to improve the adjacent light interference and afterimage problems. In some embodiments, the light absorbing layer is printed with black paint on at least one of the surface and the bottom surface of the light guide plate 20.

[0079] In some embodiments, the backlight module 2 further includes an adhesive layer (not shown). The adhesive layer is located on at least one of the surface and the bottom surface of the light guide plate 20, and the orthographic projection of the adhesive layer on the light guide plate 20 overlaps with the plurality of extinction microstructures 210. Since the first light L1 / the second light L2 penetrating the adhesive layer will produce an optical phenomenon similar to frosted glass, the adhesive layer can be used as a light reduction structure. Thereby, the adhesive layer absorbs the first light L1 / the second light L2 from any first block 2000 / the second block 2020 or weakens the light intensity value of the first light L1 / the second light L2 to prevent the first light L1 / the second light L2 from reaching the adjacent first block 2000 / the second block 2020 by reflection, that is, the adhesive layer is used as a light reduction structure between adjacent blocks to improve the adjacent light interference and afterimage problems. In some embodiments, the adhesive layer may be, but is not limited to, a hydrogel layer having an opaque material or a light absorbing material.

[0080] Please refer back Figure 1 In some embodiments, the reflective sheet 28 is located between the circuit board 1 and the light guide plate 20. The reflective sheet 28 includes a plurality of third openings 280, and the orthographic projections of the plurality of third openings 280 on the light guide plate 20 overlap the plurality of first openings 2002 and the plurality of second openings 2022. The plurality of first light emitting elements 220 and the plurality of second light emitting elements 222 are located in the plurality of third openings 280 and protrude from the reflective sheet 28. Thus, each of the first light emitting element 220 and the second light emitting element 222 emits the first light L1 and the second light L2 through the first light emitting surface 2200 and the second light emitting surface 2220, respectively, and the first light L1 and the second light L2 are incident on the first block 2000 and the second block 2020 of the light guide plate 20 from the side of the plurality of third openings 280, respectively, and the reflective sheet 28 reflects the first light L1 and the second light L2 leaking from the bottom surface of the light guide plate 20, thereby increasing the amount of light entering the light guide plate 20 for total reflection transmission. In some embodiments, the reflective sheet 28 is manufactured on the circuit board 1 by film printing. In some embodiments, the reflective sheet 28 is fabricated on the bottom surface of the light guide plate 20 by laminating.

[0081] Figure 5 A partial enlarged top view of a backlight module according to an embodiment is shown. Figure 1 and Figure 2 In some embodiments, the first block 2000 has a plurality of light-concentrating microstructures 208 parallel to the first light-emitting surface 2200, and the second block 2020 also has a plurality of light-concentrating microstructures 208 parallel to the second light-emitting surface 2220. In one example, the light-concentrating microstructures 208 include but are not limited to: V-shaped grooves and arc grooves. Thus, the light-emitting angles of the first light-emitting element 220 and the second light-emitting element 222 can be converged to 60 to 70 degrees to improve the directivity of the light.

[0082] In some embodiments, please also refer to Figure 3 and Figure 5 , the first light emitting element 220 is located on the circuit board 1, and the circuit board 1 has a light absorption area 212 adjacent to the first light emitting element 220. The first light emitting element 220 protrudes from the first opening 2002, and emits a first light L1 through the first light emitting surface 2200, and enters the first block 2000. Similarly, the second light emitting element 222 is located on the circuit board 1, and the circuit board 1 has a light absorption area 212 adjacent to the second light emitting element 222. The second light emitting element 222 protrudes from the second opening 2022, and emits a second light L2 through the second light emitting surface 2220, and enters the second block 2020. That is, the circuit board 1 has a plurality of light absorption areas 212, and the plurality of light absorption areas 212 are adjacent to the plurality of first light emitting surfaces 2200 and the plurality of second light emitting surfaces 2220. Thus, the light absorption area 212 absorbs the first light L1 and the second light L2 from the first light emitting surface 2200 and the second light emitting surface 2220, and reduces the light intensity difference between the center and the two sides when the first light emitting element 220 and the second light emitting element 222 emit light, thereby avoiding the generation of bright spots. Therefore, the brightness of the first block 2000 and the second block 2020 in the light guide plate 20 is not too abrupt in visual perception, and the light spot phenomenon caused by the close distance between the first light emitting element 220 and the first microstructure 2004 and the close distance between the second light emitting element 222 and the second microstructure 2024 can be avoided.

[0083] In some embodiments, the light absorption area 212 is black paint printed on the circuit board 1. In some embodiments, the light absorption pattern, geometric shape, area size and other designs of the light absorption area 212 can be adjusted according to factors such as the view angle, light intensity and width of the first block 2000 of the first light emitting element 220, and the above adjustment can be obtained through experiments to obtain a better design solution.

[0084] In some embodiments, the light absorbing area 212 is located on the light guide plate 20 and / or the reflective sheet 28 (not shown in the figure), for example, by printing black paint as the light absorbing area 212. Thereby, the light absorbing area 212 absorbs the first light L1 and the second light L2 from the first light emitting surface 2200 and the second light emitting surface 2220, reduces the light intensity difference between the center and the two sides when the first light emitting element 220 and the second light emitting element 222 emit light, and avoids the generation of bright spots. Therefore, the brightness of the first block 2000 and the second block 2020 in the light guide plate 20 is not too abrupt in visual perception, and the light spot phenomenon caused by the close distance between the first light emitting element 220 and the first microstructure 2004 and the close distance between the second light emitting element 222 and the second microstructure 2024 can be avoided.

[0085] In summary, according to some embodiments, the backlight module 2 and its light-emitting touch device use a light shielding strip 24 extending and distributed at the junction 240 between the first plate 200 and the second plate 202 to block the penetration of light between the first plate 200 and the second plate 202, and prevent any microstructure from being mistakenly illuminated by light from an adjacent plate and causing residual images. That is, when any light-emitting element is partitioned / lit individually, the block where the unlit light-emitting element is located can avoid simultaneous display, thereby improving the problem of adjacent light interference and residual images, so that each block can independently display a predetermined pattern, which is convenient for users to view / touch operation. In addition, in some embodiments, at least one of the circuit board 1, the light guide plate 20 and the reflective sheet 28 has a light absorption area 212, whereby the light absorption area 212 absorbs the first light L1 and the second light L2 from the first light emitting surface 2200 and the second light emitting surface 2220, thereby reducing the difference in light intensity between the center and the two sides when the first light-emitting element 220 and the second light-emitting element 222 emit light, thereby avoiding the brightness of the first block 2000 and the second block 2020 being too abrupt visually, thereby improving the light spot phenomenon.

[0086] Of course, the present invention may have many other embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art may make various corresponding changes and modifications based on the present invention, but these corresponding changes and modifications should all fall within the scope of protection of the claims attached to the present invention.

Claims

1. A light-emitting touch device, characterized in that: include: Circuit board, including touch control circuit; as well as A backlight module is located on the circuit board, and the backlight module includes: A light guide plate, comprising a first plate body and a second plate body embedded in each other, wherein the first plate body comprises a plurality of first blocks and a plurality of first openings aligned with the plurality of first blocks, and the second plate body comprises a plurality of second blocks and a plurality of second openings aligned with the plurality of second blocks, wherein the plurality of first blocks have a plurality of first microstructures, and the plurality of second blocks have a plurality of second microstructures; a light source assembly electrically connected to the circuit board, the light source assembly comprising a plurality of first light emitting elements and a plurality of second light emitting elements arranged opposite to and alternately, each of the first light emitting elements having a first light emitting surface, each of the second light emitting elements having a second light emitting surface, wherein the plurality of first light emitting elements respectively protrude from the plurality of first openings and face the plurality of first blocks with the first light emitting surfaces, and the plurality of second light emitting elements respectively protrude from the plurality of second openings and face the plurality of second blocks with the second light emitting surfaces; and A light shielding strip, located at the outer periphery of the light guide plate and extending to the junction between the first plate and the second plate, for blocking the penetration of light between the first plate and the second plate; and The cover plate is located on the light guide plate, and comprises a plurality of first light-transmitting areas and a plurality of second light-transmitting areas respectively corresponding to the plurality of first microstructures and the plurality of second microstructures.

2. The luminous touch device according to claim 1, characterized in that: There are a plurality of first accommodation spaces corresponding to the plurality of second blocks between the plurality of first blocks, there are a plurality of second accommodation spaces corresponding to the plurality of first blocks between the plurality of second blocks, and the shading strip is in a continuous S shape at the junction of the first plate body and the second plate body.

3. The luminous touch device according to claim 1, characterized in that: When at least one of the plurality of first light-emitting devices is driven, it is used to emit a first light toward the first block, and when at least one of the plurality of second light-emitting devices is driven, it is used to emit a second light toward the second block. The first light is blocked by the shading strip located at the intersection and does not enter the second block, and the second light is blocked by the shading strip located at the intersection and does not enter the first block.

4. The luminous touch device according to claim 1, characterized in that: The first block and the second block respectively have a plurality of light-gathering microstructures parallel to the first light-emitting surface and the second light-emitting surface, and the light-gathering microstructures include V-shaped grooves and arc grooves.

5. The luminous touch device according to claim 1, characterized in that: The light guide plate has a plurality of extinction microstructures between the plurality of first openings and between the plurality of second openings.

6. The luminous touch device according to claim 1, characterized in that: The circuit board is provided with a plurality of light absorbing areas adjacent to the plurality of first light emitting surfaces and the plurality of second light emitting surfaces.

7. The luminous touch device according to claim 1, characterized in that: Also includes: The reflective sheet is located between the circuit board and the light guide plate, and includes a plurality of third openings. The plurality of third openings overlap the plurality of first openings and the plurality of second openings in the orthographic projection of the light guide plate. The plurality of first light-emitting components and the plurality of second light-emitting components are located in the plurality of third openings and protrude from the reflective sheet.

8. The luminous touch device according to claim 1, characterized in that: The first light-transmitting area and the second light-transmitting area are located on the same central axis and are bilaterally symmetrical.

9. A backlight module, suitable for electrically connecting to a circuit board, the backlight module comprising: A light guide plate, comprising a first plate body and a second plate body embedded in each other, wherein the first plate body comprises a plurality of first blocks and a plurality of first openings aligned with the plurality of first blocks, and the second plate body comprises a plurality of second blocks and a plurality of second openings aligned with the plurality of second blocks, wherein the plurality of first blocks have a plurality of first microstructures, and the plurality of second blocks have a plurality of second microstructures; A light source assembly, electrically connected to the circuit board, comprising a plurality of first light emitting elements and a plurality of second light emitting elements arranged opposite to each other and staggered, each of the first light emitting elements having a first light emitting surface, each of the second light emitting elements having a second light emitting surface, wherein the plurality of first light emitting elements respectively protrude from the plurality of first openings and face the plurality of first blocks with the first light emitting surfaces, and the plurality of second light emitting elements respectively protrude from the plurality of second openings and face the plurality of second blocks with the second light emitting surfaces; as well as The shading strip is located at the outer periphery of the light guide plate and extends to the junction between the first plate body and the second plate body to block the penetration of light between the first plate body and the second plate body.

10. The backlight module according to claim 9, characterized in that: There are a plurality of first accommodation spaces corresponding to the plurality of second blocks between the plurality of first blocks, there are a plurality of second accommodation spaces corresponding to the plurality of first blocks between the plurality of second blocks, and the shading strip is in a continuous S shape at the junction of the first plate body and the second plate body.

11. The backlight module according to claim 9, characterized in that: When at least one of the plurality of first light-emitting elements is driven, it is used to emit a first light toward the first block, and when at least one of the plurality of second light-emitting elements is driven, it is used to emit a second light toward the second block. The first light is blocked by the shading strip located at the intersection and does not enter the second block, and the second light is blocked by the shading strip located at the intersection and does not enter the first block.

12. The backlight module according to claim 9, characterized in that: The first block and the second block respectively have a plurality of light-gathering microstructures parallel to the first light-emitting surface and the second light-emitting surface, and the light-gathering microstructures include V-shaped grooves and arc grooves.

13. The backlight module according to claim 9, characterized in that: The light guide plate has a plurality of extinction microstructures between the plurality of first openings and between the plurality of second openings.

14. The backlight module according to claim 9, characterized in that: Also includes: The reflector is located below the light guide plate and includes a plurality of third openings. The third openings overlap the first openings and the second openings in their orthographic projections on the light guide plate. The first light-emitting components and the second light-emitting components are located in the third openings and protrude from the reflector.

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