Touch back light module, manufacturing method thereof and application thereof

Abstract

The application relates to the technical field of touch backlight modules, in particular to a touch backlight module and a manufacturing method and application thereof, which comprise the following: a circuit board, wherein a light emitting element for providing a light source is arranged on the circuit board; a reflection structure arranged above the circuit board, wherein the reflection structure is used for concentrating and reflecting the light source to a light guide plate; the light guide plate arranged above the reflection structure, wherein a light emitting area is arranged on the light guide plate, and the light emitting area is provided with a light guide microstructure; a light shielding structure arranged above the light guide plate, wherein a light transmission area and a light shielding area are arranged on the light shielding structure; and a touch plate arranged above the light shielding structure, wherein the application can reduce light leakage, further improve light utilization, and improve visual effects.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of touch backlight module, in particular to a touch backlight module and a manufacturing method thereof and an application thereof. BACKGROUND

[0002] At present, electronic products such as notebook computers on the market generally have physical keys and touch panels. With the development of portable electronic products in the direction of thinness, structures such as physical keys that require higher space need to be converted to planar touch structures. Similar to the conversion of early key phones to full-screen touch phones, there are no phonetic keys and number keys. Virtual phonetic keys and virtual number keyboards are displayed on the touch panel. That is, the photoelectric module, the touch backlight module, combines the functions of the touch panel and the backlight module.

[0003] Prior art one: touch module (publication number CN115050285A) discloses a circuit board, a light emitting element, a light guide plate, and a light reflecting plate. The light emitting element is electrically connected to the circuit board and has an upper light emitting surface. The light guide plate is arranged above the circuit board, and the light reflecting plate is arranged above the light guide plate. The light reflecting plate includes a first surface facing the light guide plate. The first surface is provided with a light transmission zone, a light shielding zone, and a light reflecting zone. The light transmission zone allows light to pass through, the light shielding zone blocks light from passing through, and the light reflecting zone reflects light back to the light guide plate. The light reflecting zone corresponds to the light emitting element. The area of the light shielding zone is greater than the area of the light reflecting zone, and the area of the light reflecting zone is greater than the area of the upper light emitting surface of the light emitting element.

[0004] Prior art two: backlight module and light emitting touch device (publication number CN114077333A) discloses a backlight module and a light emitting touch device. The light emitting touch device includes a circuit board, a backlight module, and a cover plate. The backlight module includes a light guide plate, a light source assembly, and a light shielding strip. The light guide plate includes a first plate body and a second plate body that are mutually embedded. The first plate body has a plurality of first microstructures, and the second plate body has a plurality of second microstructures. The light shielding strip is located at the outer periphery of the light guide plate and extends to the interface 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 includes a first light transmission zone and a second light transmission zone corresponding to the first microstructures and the second microstructures, respectively.

[0005] In the above-mentioned prior art or conventional backlight module, the light leakage is prevented by adjusting the light quantity and / or angle of the light source to further prevent interference and other problems. However, this method still has certain light leakage, and the light utilization rate still needs to be improved, which affects the visual effect. SUMMARY

[0006] The purpose of the present application is to provide a touch backlight module and a manufacturing method thereof and an application thereof, which can reduce light leakage, further improve light utilization rate, and improve visual effect.

[0007] To achieve the above object, the present application provides the technical solutions as follows:

[0008] In a first aspect, the present application provides a touch backlight module, comprising:

[0009] a circuit board, wherein the circuit board is provided with a light emitting element for providing a light source;

[0010] a reflection structure, which is arranged above the circuit board, and is used for concentrating and reflecting the light source to a light guide plate;

[0011] a light guide plate, which is arranged above the reflection structure, and is provided with a light emitting area, wherein the light emitting area is provided with a light guide microstructure;

[0012] a light shielding structure, which is arranged above the light guide plate, and is provided with a light transmitting area and a light shielding area;

[0013] a touch plate, which is arranged above the light shielding structure.

[0014] Further, the light guide plate is further provided with a second light inlet hole or a light inlet edge; the reflection structure is provided with a first light inlet hole which is vertically through the second light inlet hole; and the light emitting element is located in the first light inlet hole and the second light inlet hole.

[0015] Preferably, the light guide plate is arranged as a plurality of independent light emitting units, and the light emitting elements of each light emitting unit are controlled individually.

[0016] Further, the light emitting unit is provided with a light shielding structure at an outer ring, and the light shielding structure at least wraps the light emitting unit from a side.

[0017] Preferably, the touch plate is provided with a display pattern, and the position of the display pattern corresponds to the position of the light emitting area on the light guide plate.

[0018] Preferably, the light shielding structure is provided with a display pattern, and the position of the display pattern corresponds to the position of the light emitting area on the light guide plate.

[0019] In a second aspect, the present application provides a manufacturing method of a touch backlight module, which is used for manufacturing the touch backlight module as described in the first aspect, and comprises the following steps:

[0020] S1. separately forming the outer contour of the reflection structure and the light guide plate of each light emitting unit;

[0021] S2. based on step S1, assembling the formed reflection structure and the light guide plate to obtain a first assembly structure, and punching the first assembly structure to form the first light inlet hole of the reflection structure and the light inlet edge of the light emitting unit respectively;

[0022] S3. Based on step S2, reassembling the circuit board, turning over the semi-finished product, assembling the light shielding structure and the touch panel in sequence, and obtaining the touch backlight module.

[0023] In a third aspect, the present application further provides a touch backlight module, comprising:

[0024] a circuit board, wherein the circuit board is provided with a light emitting element for providing a light source and an opening for light transmission;

[0025] a light guide plate, which is arranged below the circuit board, wherein the light guide plate is provided with a groove, and the light emitting element is arranged in the groove;

[0026] a reflection structure, which is arranged below the light guide plate, and is used for concentrating and reflecting light to the light guide plate;

[0027] a touch panel, which is arranged above the circuit board.

[0028] Preferably, the touch panel is provided with a display pattern, and the display pattern is arranged at a position corresponding to the position of the opening on the circuit board.

[0029] In a fourth aspect, the present application provides a touch device, which comprises the touch backlight module according to any one of the first aspect or the third aspect.

[0030] The present application has the following advantages:

[0031] 1) The circuit board, the reflection structure, the light guide plate, the light shielding structure and the touch panel arranged in sequence are beneficial to prevent light leakage; the display pattern is arranged on the touch panel or the light shielding structure, and when the display pattern is arranged on the light shielding structure, the visual effect problem caused by the difference between the position of the light emitting area and the position of the display pattern can be avoided; the light guide plate is arranged as a plurality of independent light emitting units, each of which can be controlled individually, the light shielding structure is arranged to wrap the light emitting units, and the light sources between the independent light emitting units are prevented from interfering with each other, thereby affecting the visual effect and misleading the user; when the light guide plate is a plurality of independent light emitting units, the reflection structure and the light guide plate are first separately formed into an outer contour, and then the light guide plate is assembled and uniformly formed into a light inlet hole, thereby avoiding the problem of non-uniform brightness caused by the uneven theoretical gap between the light emitting element and the light guide plate during production.

[0032] 2) In this embodiment 4 of the present invention, the relative positions of the circuit board, the light guide plate, and the reflective structure are changed. The circuit board is placed above the light guide plate, and the circuit board body is used directly to replace the light-shielding structure for light shielding. This not only saves materials and reduces processing steps, but also avoids the heat melting phenomenon of the adhesive layer of the light-shielding structure, thus improving the final display visual effect. Furthermore, the circuit board being placed on the top layer can also provide further heat insulation. A groove is provided on the light guide plate, and the light-emitting element is placed in the groove. The light emitted by the light-emitting element is input into the light guide plate through the light input surface on the groove, which can further improve the utilization rate of light and avoid light leakage. At the same time, since the light-emitting element is placed in the groove, the light emitted by the light-emitting element is input into the light-emitting areas on the left and right sides through the light input surface on the groove, which can reduce the number of light-emitting elements. Attached Figure Description

[0033] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0034] Figure 1 This is a three-dimensional exploded view of the display pattern set on the touch panel in Embodiment 1 of the present invention;

[0035] Figure 2 This is an exploded perspective view of the display pattern being disposed on the light-shielding structure in Embodiment 1 of the present invention;

[0036] Figure 3 This is a top view of the circuit board in Embodiment 1 of the present invention;

[0037] Figure 4 This is a circuit diagram of the light-emitting element in Embodiment 1 of the present invention;

[0038] Figure 5 This is a top view of the reflective structure in Embodiment 1 of the present invention;

[0039] Figure 6 This is a top view of the light guide plate in Embodiment 1 of the present invention;

[0040] Figure 7 This is a top view of the light-transmitting area provided on the light-shielding structure in Embodiment 1 of the present invention;

[0041] Figure 8 This is a top view of the display pattern set on the light-shielding structure in Embodiment 1 of the present invention;

[0042] Figure 9 This is a top view of the touchpad in Embodiment 1 of the present invention;

[0043] Figure 10 This is a three-dimensional exploded view of the display pattern set on the touch panel in Embodiment 2 of the present invention;

[0044] Figure 11 This is an exploded perspective view of the display pattern being disposed on the light-shielding structure in Embodiment 2 of the present invention;

[0045] Figure 12 This is a cross-sectional view of Embodiment 2 of the present invention;

[0046] Figure 13 This is a schematic diagram of the assembly structure when the display is not partitioned in Embodiment 3 of the present invention;

[0047] Figure 14 This is a schematic diagram of the assembly structure for partitioned display in Embodiment 3 of the present invention;

[0048] Figure 15 This is a schematic diagram of the assembly process of the first assembly structure in Embodiment 3 of the present invention;

[0049] Figure 16 This is a cross-sectional view of the touch backlight module in Embodiment 4 of the present invention;

[0050] Figure 17 A white line display interface appears in one embodiment of the present invention;

[0051] The markings in the diagram are as follows: 1 is the circuit board, 11 is the light-emitting element, 12 is the circuit board body, 13 is the light-emitting element circuit, 14 is the opening, 2 is the reflective structure, 21 is the first light entrance hole, 22 is the reflective area, 3 is the light guide plate, 31 is the second light entrance hole, 32 is the light guide plate body, 33 is the light-emitting area, 34 is the groove, 35 is the light-emitting surface, 36 is the light input surface, 4 is the light-shielding structure, 41 is the light-transmitting area, 42 is the light-shielding structure body, 5 is the touch panel, 51 is the touch panel body, 6 is the light-blocking structure, 71 is the first light-emitting unit, 72 is the second light-emitting unit, 73 is the third light-emitting unit, 74 is the fourth light-emitting unit, 8 is the display pattern, 9 is the theoretical gap, 91 is the first gap value, 94 is the fourth gap value, and 10 is the white line. Detailed Implementation

[0052] Example 1

[0053] like Figures 1-9 The touch backlight module shown in this embodiment 1 has all light-emitting elements 11 lit or turned off simultaneously. Figure 1 As shown, it includes: circuit board 1, reflective structure 2, light guide plate 3, light shielding structure 4, and touch panel 5.

[0054] Circuit board 1, such as Figure 3 As shown, the circuit board 1 is provided with a light-emitting element 11 for providing a light source, and also includes a circuit board body 12; the light-emitting element 11 provides a light source and is electrically connected to the circuit board body 12. Multiple light-emitting elements 11 can be connected in series or in parallel, or a combination of series and parallel connections. One specific embodiment is as follows: Figure 4The light-emitting element circuit 13 is shown in the figure.

[0055] In one specific embodiment, the light-emitting element 11 is an LED, which can be white, red, or multiple colors such as RGB. Its light emission direction can be side-emitting or front-emitting, and the size of the LED is not limited.

[0056] In one specific embodiment, the circuit board 1 can be a rigid PCB, a flexible circuit board (FPC), or a rigid-flex PCB. The material, shape, and size of the circuit board 1 can be adjusted as needed, and no further restrictions are imposed here.

[0057] Reflective structure 2, located above circuit board 1, is used to concentrate and reflect light onto light guide plate 3, such as... Figure 5 As shown, the reflective structure 2 includes a first light entrance aperture 21 and a reflective area 22.

[0058] In one specific embodiment, the reflective structure 2 can be a reflective sheet, a material with high reflectivity such as aluminum foil, or a material with high reflectivity such as screen-printed white ink to reflect light. The material, shape, and size of the reflective structure 2 can be adjusted as needed, and no further restrictions are imposed here.

[0059] Light guide plate 3, disposed above reflective structure 2, includes light guide plate body 32, light guide plate body 32 having light-emitting area 33, and light-emitting area 33 having light-guiding microstructure, such as... Figure 6 As shown, the light guide plate 3 is also provided with a second light inlet hole 31.

[0060] In one specific embodiment, the light-guiding microstructure of the light-emitting region 33 is light-emitting ink or light-emitting particles.

[0061] Light-shielding structure 4 is positioned above light guide plate 3, such as... Figure 7 As shown, the light-shielding structure 4 is provided with a light-transmitting area 41 and a light-shielding area. In one embodiment, the light-shielding area is the light-shielding structure body 42.

[0062] In one specific embodiment, the light-shielding structure 4 can be made of materials such as PET or PC, and its material, shape, and size can be adjusted as needed, without too many restrictions.

[0063] The touchpad 5 is positioned above the light-shielding structure 4.

[0064] In one specific implementation, the touchpad 5 is made of PC or glass, and its material, shape, and size can be adjusted as needed, without too many restrictions.

[0065] In one specific implementation, such as Figure 1 or Figure 9As shown, the display pattern 8 is set on the touch panel body 51, and the position of the display pattern corresponds to the position of the light-emitting area 33 on the light guide plate 3. When the display pattern 8 is set on the touch panel 5, the corresponding position of the light-shielding structure 4 is set as the light-transmitting area 41. At this time, the area of ​​the light-transmitting area is larger than the area of ​​the display pattern.

[0066] In another specific implementation, such as Figure 2 or Figure 8 As shown, the display pattern 8 is directly set on the light-shielding structure 4, and the position of the display pattern 8 corresponds to the position of the light-emitting area 33 on the light guide plate 3. This method can avoid visual misalignment caused by the difference in position between the light-transmitting area 41 and the display pattern 8.

[0067] In one specific embodiment, the display pattern 8 includes, but is not limited to, characters, numbers, etc., and the display pattern 8 is established on the light-shielding structure 4 or the touch panel 5 by printing or laser engraving.

[0068] Example 2

[0069] Based on Example 1, such as Figure 10 and Figure 12 The touch backlight module shown has 11 light-emitting elements that are displayed in separate zones and can be lit up individually. In this embodiment 2, the light guide plate 3 is set as multiple independent light-emitting units, and each light-emitting unit is controlled individually.

[0070] A light-blocking structure 6 is provided on the outer ring of the light-emitting unit. The light-blocking structure 6 surrounds the light-emitting unit and can avoid interfering with the light guiding effect of the light guide plate 3 between adjacent light-emitting elements 11.

[0071] In one specific implementation, such as Figure 10 As shown, the display pattern 8 is disposed on the touchpad body 51, wherein the position of the display pattern corresponds to the position of the light-emitting area 33 on the light guide plate 3. Figure 10 The central light-emitting area 33 is not shown. When the display pattern 8 is set on the touch panel 5, the corresponding position of the light-shielding structure 4 is set as the light-transmitting area 41. At this time, the area of ​​the light-transmitting area is larger than the area of ​​the display pattern.

[0072] In another specific implementation, such as Figure 11 As shown, the display pattern 8 is directly disposed on the light-shielding structure 4, wherein the position of the display pattern 8 corresponds to the position of the light-emitting area 33 on the light guide plate 3. Figure 11 The position of the central luminous area 33 is not shown. This method can avoid visual misalignment caused by the difference in position between the light-transmitting area 41 and the display pattern 8.

[0073] In one specific embodiment, the display pattern 8 includes, but is not limited to, characters, numbers, etc., and the display pattern 8 is established on the light-shielding structure 4 or the touch panel 5 by printing or laser engraving.

[0074] The other structures of this embodiment 2 are the same as those of embodiment 1.

[0075] Example 3

[0076] like Figure 13 As shown, when the light guide plate 3 is not divided into sections, there is only one light-emitting area 33, which is lit or turned off at the same time. There is only one theoretical gap 9 between the light-emitting element 11 and the light guide plate 3. When the light-emitting element 11 and the light guide plate 3 are assembled, the actual gap values ​​corresponding to different display patterns 8 are simultaneously larger or smaller than the theoretical gap 9. At this time, the actual gap has the same effect on the display pattern 8, and they are uniformly lit or darkened together.

[0077] But if Figure 14 As shown, when the light guide plate is divided into 3 sections, there are multiple light-emitting areas 33. Figure 14 The diagram shows a first light-emitting unit 71, a second light-emitting unit 72, a third light-emitting unit 73, and a fourth light-emitting unit 74. Multiple light-emitting areas 33 correspond to multiple display patterns 8. After the light-emitting element 11 is assembled with the light guide plate 3, the actual gap values ​​corresponding to the display patterns 8 in different light-emitting units are different. The actual gap value corresponding to the first light-emitting unit 71 is the first gap value 91, the actual gap value corresponding to the second light-emitting unit 72 is the second gap value, the actual gap value corresponding to the third light-emitting unit 73 is the third gap value, and the actual gap value corresponding to the fourth light-emitting unit 74 is the fourth gap value 94. Figure 14 The first gap value 91 and the fourth gap value 94 are shown. The second gap value and the third gap value are not marked. At this time, the multiple actual gap values ​​are inconsistent with the theoretical gap 9. They may be too large or too small at the same time, which will lead to different light emission stability of different display patterns 8.

[0078] Therefore, a method for manufacturing a touch backlight module is proposed, for use in the touch backlight module proposed in Embodiment 2, such as... Figure 15 As shown, it includes the following steps:

[0079] S1. Individually molded reflective structures and the outer contours of each light-emitting unit in the light guide plate;

[0080] S2. Based on step S1, the formed reflective structure and light guide plate are assembled to obtain the first assembly structure. The first assembly structure is punched to form the first light entrance hole of the reflective structure and the light entrance edge of the light-emitting unit.

[0081] S3. Based on step S2, reassemble the circuit board, flip the semi-finished product over, and assemble the light-shielding structure and touch panel in sequence to obtain the touch backlight module.

[0082] Example 4

[0083] As proposed in Embodiment 1 or Embodiment 2, the touch backlight module uses a light-shielding structure for light blocking. Commonly used light-shielding structures are thin and flexible, making them difficult to adhere tightly to the light guide plate. Therefore, adhesive needs to be applied to their surface for bonding and fixing the light guide plate. Since the light-emitting element continuously generates heat when emitting light, the adhesive layer of the light-shielding structure near the light-emitting element is prone to heat melting, which will appear on the final display interface. Figure 17 The white line 10 (or bright line) shown indicates uneven brightness on the display interface, affecting the visual effect.

[0084] Therefore, as Figure 16 As shown, the present invention also provides a touch backlight module, comprising:

[0085] Circuit board 1, which is provided with light-emitting element 11 for providing light source and opening 14 for light transmission;

[0086] A light guide plate 3 is disposed below the circuit board 1. A groove 34 is provided on the light guide plate 3. The light-emitting element 11 is disposed in the groove 34. The inner side of the groove is a light input surface 36. The light input surface 36 is provided with a V-shaped structure, an S-shaped structure, or a rough surface structure to improve the light incident efficiency and light coupling efficiency.

[0087] In one specific embodiment, the groove 34 is a regular rectangle or V-shape, but it can also be an irregular shape, without much restriction.

[0088] Reflection structure 2 is disposed below light guide plate 3. Reflection structure 2 is used to concentrate and reflect the light source onto light guide plate 3.

[0089] Touchpad 5 is positioned above circuit board 1. A display pattern 8 is provided on touchpad 5, and the position of display pattern 8 corresponds to the position of opening 14 on circuit board 1. Figure 11 Not shown in the image.

[0090] Reference Figure 16 The light-emitting element 11 is disposed in the groove 34 to emit light. The light emitted by the light-emitting element 11 is input into the light guide plate 3 through the light input surface 36 on the groove 34, and then output from the light output surface 35 of the light guide plate 3, passing through the opening 14 on the circuit board 1 and being mapped onto the touch panel.

[0091] This solution differs from the direct-up light emission method in Embodiment 1, Embodiment 2, or the prior art where the circuit board is placed below the light guide plate. In this embodiment 4, the relative positions of the circuit board 1, the light guide plate 3, and the reflective structure 2 are changed. The circuit board 1 is placed above the light guide plate 3. The circuit board is made of rigid material, and only a structure similar to a positioning post is needed to mechanically position it on the light guide plate to ensure a tight fit between the two. Therefore, no adhesive is needed. The circuit board 1 body is used directly to replace the light-shielding structure 4 for light shielding, which not only saves materials and reduces processing steps, but also avoids the heat melting phenomenon of the adhesive layer of the light-shielding structure 4. Furthermore, the circuit board 1, being on the top layer, can also be further insulated. A groove 34 is provided on the light guide plate 3, and the light-emitting element 11 is placed in the groove 34. The light emitted by the light-emitting element 11 is input into the light guide plate 3 through the light input surface 36 on the groove 34, which can further improve the utilization rate of light and avoid light leakage. At the same time, since the light-emitting element 11 is placed in the groove 34, the light emitted by the light-emitting element 11 is input into the light emission areas on the left and right sides through the light input surface 36 on the groove 34, which can reduce the number of light-emitting elements.

[0092] Example 5

[0093] A touch device is provided, comprising the touch backlight module described in any one of the first aspects.

[0094] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A manufacturing method of a touch back light module, for manufacturing a touch back light module, characterized in that, the touch back light module comprises: a circuit board, wherein a light emitting element for providing a light source is arranged on the circuit board; a reflection structure arranged above the circuit board, wherein the reflection structure is used for concentrating and reflecting the light source to a light guide plate; the light guide plate arranged above the reflection structure, wherein a light emitting area is arranged on the light guide plate, and the light emitting area is provided with a light guide microstructure; a light shielding structure arranged above the light guide plate, wherein a light transmission area and a light shielding area are arranged on the light shielding structure; and a touch plate arranged above the light shielding structure; the manufacturing method of the touch back light module comprises the following steps: S1. separately forming the outer contour of each light emitting unit of the reflection structure and the light guide plate; S2. based on step S1, assembling the formed reflection structure and the light guide plate to obtain a first assembly structure, and uniformly punching the first assembly structure to respectively form a first light inlet hole of the reflection structure and a light inlet edge of the light emitting unit; and S3. based on step S2, assembling the circuit board, turning over the semi-finished product, and sequentially assembling the light shielding structure and the touch plate to obtain the touch back light module. The light guide plate is further provided with a second light inlet hole or a light inlet edge; the reflection structure is provided with a first light inlet hole penetrating the second light inlet hole from top to bottom; and the light emitting element is located in the first light inlet hole and the second light inlet hole corresponding thereto. The light guide plate is arranged as a plurality of independent light emitting units, and the light emitting element of each light emitting unit is individually controlled. The light emitting unit is provided with a light shielding structure wrapped from the side. The touch plate is provided with a display pattern corresponding to the position of the light emitting area on the light guide plate. The light shielding structure is provided with a display pattern corresponding to the position of the light emitting area on the light guide plate. The circuit board is provided with a light emitting element for providing a light source and an opening for light transmission. The light guide plate is arranged below the circuit board and is provided with a groove, and the light emitting element is arranged in the groove; the inner side of the groove is a light input surface, and the light input surface is provided with a V-shaped structure or an S-shaped structure or a rough surface structure. The touch plate is arranged above the circuit board. The touch plate is provided with a display pattern corresponding to the position of the opening on the circuit board. The touch back light module manufactured by the manufacturing method of the touch back light module according to any one of claims 1-4, or the touch back light module according to any one of claims 7-8. 2.The manufacturing method of the touch-backlight module according to claim 1, wherein: ​ 3.The method of claim 1, wherein: ​ 4. The method of claim 3, wherein: ​ 5. The method of claim 1 to 4, wherein: ​ 6. The method of claim 1 to 4, wherein: ​ 7. A touch-backlight module, characterized by ​ ​ ​ ​ ​ 8.The touch-backlight module according to claim 7, wherein: ​ 9. A touch device, comprising: ​

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