Touch panel front light module with tracking and lightening effects

Abstract

The utility model provides a touch panel front light module with a tracking and lightening effect, which comprises a first light guide sheet, a second light guide sheet and a light guide plate, wherein the first light guide sheet is arranged on a touch circuit substrate; the light guide plate is provided with a first light incident side and first lattice points of which the arrangement density is reduced from the side to the other side, or is provided with first and third light incident sides and first lattice points of which the arrangement density is changed from high to low to high to low in the direction from the first light incident side to the third light incident side; the second light guide sheet is arranged on the first light guide sheet and is provided with a second light incident side and second lattice points of which the arrangement density is reduced from the side to the other side, or is provided with second and fourth light incident sides and second lattice points of which the arrangement density is changed from the second light incident side to the fourth light incident side in a high-low-high-low manner; and the light sources are arranged corresponding to the light incident sides. Therefore, a tracking lightening effect or uniform planar light emission can be achieved by controlling the light source.

Description

Technical Field

[0001] The utility model relates to the technical field of light guide modules, in particular to a front light module for a touch panel with a tracking lighting effect. Background Art

[0002] The touch panel technology is widely used in modern electronic devices. It can be seen in smart phones, tablet computers, notebook computers, household appliances or various interactive devices. For example, when applied to a notebook computer, it can be used as an alternative device to a mouse to control the mouse pointer, click and perform gesture operations, or provide shortcut functions, etc. With the current market preferences, the aesthetic requirements for such touch products are becoming increasingly strict. For example, it is necessary to achieve adjustable brightness, uniform color illumination, or form power switches, application function indicator lights on the touchpad, or provide dynamic lighting effects that can enhance interactivity and aesthetics. Therefore, how to provide touch products with aesthetic function performance in the market is an important issue for relevant manufacturers to develop and design.

[0003] In view of this, the inventor summarized the rich experience of being engaged in the relevant industry for many years, conceived and proposed a front light module for a touch panel with a tracking lighting effect, so that the touch product has a special dynamic lighting effect. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a front light module for a touch panel with a tracking lighting effect. Through the double light guide plates and the special dot design thereon, combined with the drive control of the light source, the light output effect of tracking the touch operation trajectory of the user and emitting light is achieved.

[0005] To achieve the above object, the present utility model discloses a touch panel front light module with a tracking lighting effect, which is used to be disposed on a touch circuit substrate and includes: a first light guide plate disposed on the touch circuit substrate, having a plurality of first light dots on the upper or lower surface thereof, and the first light guide plate having a first light incident side, wherein the layout density of the first light dots decreases from the first light incident side towards the other side; a second light guide plate disposed on the first light guide plate, having a plurality of second light dots on the upper or lower surface thereof, and the second light guide plate having a second light incident side, wherein the layout density of the second light dots decreases from the second light incident side towards the other side, and the first light incident side and the second light incident side are oppositely disposed; a plurality of first light sources disposed corresponding to the first light incident side for providing side-incident light to the first light guide plate; and a plurality of second light sources disposed corresponding to the second light incident side for providing side-incident light to the second light guide plate; wherein when the first light source is lit, the area corresponding to the first light source on the first light guide plate emits light according to the first light dots, and when the second light source is lit, the area corresponding to the second light source on the second light guide plate emits light according to the second light dots, thereby achieving a tracking lighting effect by lighting different ones of the first light sources and the second light sources; and when the first light source and the second light source are lit simultaneously, the first light guide plate and the second light guide plate form a uniform planar light emission. Thus, by lighting the corresponding first or second light source according to the user's touch operation, a dynamic light emission effect of tracking the user's touch position and forming light emission can be provided.

[0006] Based on the foregoing embodiment, in another embodiment, the touch panel front light module further includes a supplementary light sheet and a plurality of reinforcing light sources. The supplementary light sheet is disposed between the first light guide plate and the second light guide plate and has a supplementary light incident side and a plurality of light blocking grooves which are arranged at intervals. The reinforcing light sources are disposed corresponding to the supplementary light incident side for providing side-incident light to the supplementary light sheet; wherein the supplementary light incident side is perpendicular to the first light incident side and the second light incident side, and the light blocking grooves are correspondingly located between any two adjacent ones of the reinforcing light sources. When the reinforcing light sources are lit, the area corresponding to the reinforcing light sources on the optical adjustment sheet emits light and forms a superimposed light emission effect with the first light guide plate or the second light guide plate. By providing the supplementary light sheet and the reinforcing light sources in another direction, an effect of more finely dividing the light emitting area can be achieved, and the presentation of the tracking lighting effect can be effectively enhanced.

[0007] In another embodiment, a plurality of first cones protrude from the edge of the first light incident side and correspond to the first light sources; a plurality of second cones protrude from the edge of the second light incident side and correspond to the second light sources, so as to improve the light utilization rate.

[0008] Based on the same technical concept, in another embodiment, the present utility model also provides a touch panel front light module with a tracking lighting effect, which is used to be disposed on a touch circuit substrate and includes: a first light guide plate disposed on the touch circuit substrate, having a plurality of first light points on the upper or lower surface thereof, and having a first light incident side and a third light incident side, the first light incident side and the third light incident side being oppositely disposed, and the distribution density of the first light points showing a high-low-high-low change trend from the first light incident side to the third light incident side direction; a second light guide plate disposed on the first light guide plate, having a plurality of second light points on the upper or lower surface thereof, and having a second light incident side and a fourth light incident side, the second light incident side and the fourth light incident side being oppositely disposed, and the second light incident side and the third light incident side being on the same side, and the distribution density of the second light points showing a high-low-high-low change trend from the second light incident side to the fourth light incident side direction; a plurality of first light sources disposed corresponding to the first light incident side for providing side-incident light to the first light guide plate; a plurality of second light sources disposed corresponding to the second light incident side for providing side-incident light to the second light guide plate; a plurality of third light sources disposed corresponding to the third light incident side for providing side-incident light to the first light guide plate; and a plurality of fourth light sources disposed corresponding to the fourth light incident side for providing side-incident light to the second light guide plate; wherein, when the first light source is lit, the area on the first light guide plate corresponding to the first light source emits light according to the first light points, when the second light source is lit, the area on the second light guide plate corresponding to the second light source emits light according to the second light points, when the third light source is lit, the area on the first light guide plate corresponding to the third light source emits light according to the first light points, when the fourth light source is lit, the area on the second light guide plate corresponding to the fourth light source emits light according to the second light points, thereby achieving a tracking lighting effect by lighting different ones of the first light source, the second light source, the third light source and the fourth light source; and when the first light source, the second light source, the third light source and the fourth light source are lit simultaneously, the first light guide plate and the second light guide plate form a uniform planar light emission. Similarly, through the size limitation of the overall thickness, the touch panel front light module also has the characteristic of being thin. In addition to controlling the light emission of the first and second light guide plates respectively with one light source, the light emission can also be controlled respectively by two light sources from the opposite sides, so that a dynamic light emission effect of emitting light in the corresponding area following the user's touch operation can also be achieved, and a more delicate tracking light emission can be realized through a larger number of light sources and a special light point design.

[0009] Based on the foregoing embodiments, in another embodiment, the front light module of the touch panel further includes a supplementary light sheet and a plurality of reinforcing light sources. The supplementary light sheet is disposed between the first light guide sheet and the second light guide sheet and has a supplementary light incident side and a plurality of light blocking grooves. The light blocking grooves are arranged at intervals. The reinforcing light sources correspond to the supplementary light incident side and are used to provide side-incident light to the supplementary light sheet. Wherein the supplementary light incident side is perpendicular to the first incident side, the second incident side, the third incident side, and the fourth incident side, and the light blocking grooves are correspondingly located between any two adjacent reinforcing light sources. When the reinforcing light sources are lit, the areas on the optical adjustment sheet corresponding to the reinforcing light sources emit light, and a superimposed light-emitting effect is formed with the first light guide sheet or the second light guide sheet. Accordingly, more accurate tracking light-emitting performance can be achieved.

[0010] In addition, in another embodiment, the first light source and the fourth light source are disposed on the upper and lower sides of the same circuit board, and the second light source and the third light source are disposed on the upper and lower sides of the same circuit board, so as to achieve the effect of simplifying the overall module structure.

[0011] In addition, in one embodiment, the first light guide sheet is adhered to the touch circuit board through a first light-transmitting adhesive layer, and the second light guide sheet is attached to the first light guide sheet through a second light-transmitting adhesive layer. With this structure, the front light module of the touch panel has the advantages of being easy to assemble and not affecting the light emission.

[0012] Further, in another embodiment, the thickness of the first light-transmitting adhesive layer is 0.05 - 0.15 mm, and the thickness of the second light-transmitting adhesive layer is 0.1 - 0.3 mm, so as to avoid overly compressing the thickness performance of other components under this dimensional condition.

[0013] Based on the foregoing embodiments or the structure without a light-transmitting adhesive layer, in another embodiment, the thicknesses of the first light guide sheet and the second light guide sheet are 0.3 - 0.5 mm, and they have both excellent light-emitting effects and the advantages of being thin.

[0014] In addition, to effectively protect the overall structure, in one embodiment, the front light module of the touch panel further includes a protective member, which is attached to the second light guide sheet through a third light-transmitting adhesive layer.

[0015] Further, in another embodiment, the thickness of the protective member is 0.5 - 0.6 mm, and the thickness of the third light-transmitting adhesive layer is 0.05 - 0.15 mm, so as to take into account both thinness and excellent protection effects and light-transmitting performance.

[0016] In summary, for the touch panel front light module with a tracking lighting effect of the present utility model, through the technical solution of combining a double light guide plate with special dot patterns and multiple light sources, by controlling the lighting state of the light sources, a tracking lighting effect that emits light according to the user's click trajectory is provided, effectively enhancing the aesthetic performance of the electronic device, and at the same time having the advantage of being thin. Further, the present utility model also proposes many additional detailed technical features to improve the performance of the touch panel front light module in various aspects. The specific content is as described in the above paragraphs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 FIG. is an exploded schematic view of a touch panel front light module according to an embodiment of the present utility model.

[0018] Figure 2 FIG. is an application schematic view of a touch panel front light module according to an embodiment of the present utility model.

[0019] Figure 3 FIG. is an exploded schematic view of a touch panel front light module in another implementation state according to an embodiment of the present utility model.

[0020] Figure 4 FIG. is an application schematic view of a touch panel front light module in another implementation state according to an embodiment of the present utility model.

[0021] Figure 5 FIG. is an assembly schematic view of a touch panel front light module in yet another implementation state according to an embodiment of the present utility model.

[0022] Figure 6 FIG. is an exploded schematic view of a touch panel front light module according to another embodiment of the present utility model.

[0023] Figure 7 FIG. is an exploded schematic view of a touch panel front light module in another implementation state according to another embodiment of the present utility model.

[0024] Figure 8 FIG. is an assembly schematic view of a touch panel front light module in yet another implementation state according to another embodiment of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The present invention will be more clearly and completely described below by way of examples in conjunction with the accompanying drawings.

[0026] As previously mentioned, in order to provide a touch optical product with a special light-emitting effect to meet the current market demand, the inventor of the present utility model conceived and proposed a touch panel front light module with a tracking lighting effect to improve the aesthetics of the touch product in terms of light-emitting performance. The structural dimensions, ratios, sizes, shapes, application states, etc. shown in the respective figures are only for illustration and are used to explain the technical features of the present utility model, and do not represent the actual structural design. This is hereby stated in advance.

[0027] Please refer to Figure 1 and Figure 2 , which are respectively the exploded schematic view and the application schematic view of the front light module of a touch panel according to an embodiment of the present utility model. The present utility model discloses a front light module 1 of a touch panel with a tracking lighting effect, which is used to be disposed on a touch circuit board 2 and includes a first light guide plate 11, a second light guide plate 12, a plurality of first light sources 13 and a plurality of second light sources 14. Incidentally, the application object of the front light module of the touch panel is, for example, a touchpad product applied to a notebook computer or a touch display product with both touch and display functions.

[0028] The first light guide plate 11 is disposed on the touch circuit board 2. The upper or lower surface of the first light guide plate 11 has a plurality of first light points 111, and the first light guide plate 11 has a first light incident side 112. The layout density of the first light points 111 decreases from the first light incident side 112 to the other side. The second light guide plate 12 is disposed on the first light guide plate 11. The upper or lower surface of the second light guide plate 12 has a plurality of second light points 121, and the second light guide plate 12 has a second light incident side 122. Among them, the layout density of the second light points 121 decreases from the second light incident side 122 to the other side, and the first light incident side 112 and the second light incident side 122 are oppositely arranged. It should be particularly mentioned that in the industry, light guide elements can be classified into light guide plates and light guide sheets according to the difference in thickness. If the light guide plate is not specifically defined, in principle, its thickness is one order of magnitude larger than that of the light guide sheet. For example, it is 2 or 3 mm, while the first light guide plate and the second light guide plate of the present utility model are of the light guide sheet grade, and the thickness dimension is approximately a few tenths of a mm. Therefore, at this component size level, the front light module 1 of the touch panel including the first light guide plate 11 and the second light guide plate 12 has the advantage of being thin. Further, the touch circuit board 2 can be made of a rigid material to provide better structural support for the front light module 1 disposed thereon. For example, when the first light guide plate 11 and the second light guide plate 12 have the above thickness performance, by means of the rigid touch circuit board 2, the effect of not being easily bent can be achieved.

[0029] The first light source 13 is disposed corresponding to the first light incident side 112 and is used to provide side-incident light to the first light guide plate 11. The second light source 14 is disposed corresponding to the second light incident side 122 and is used to provide side-incident light to the second light guide plate 12. Among them, the first light source 13 and the second light source 14 can be respectively disposed on the circuit board and implemented in a light bar structure, or can be respectively disposed on the touch circuit board 2 by, for example, SMT. In this embodiment, the first light source 13 and the second light source 14 are taken as an example of being implemented in a light bar structure state.

[0030] Based on the above structural features, when the first light source 13 is lit, the area of the first light guide plate 11 corresponding to the first light source 13 emits light according to the first dot pattern 111. When the second light source 14 is lit, the area of the second light guide plate 12 corresponding to the second light source 14 emits light according to the second dot pattern 121. Thus, by lighting different first light sources 13 and second light sources 14, a tracking lighting effect is achieved. More specifically, according to the layout density performance of the first dot pattern 111, when the first light source 13 is lit, the first light guide plate 11 will have a large amount of light emission in the area near the first light incident side 112, that is, a relatively large amount of light is emitted. Similarly, according to the layout density performance of the second dot pattern 121, when the second light source 14 is lit, the second light guide plate 12 will have a large amount of light emission in the area near the second light incident side 122, that is, a relatively large amount of light is emitted. In this way, when different first light sources 13 or second light sources 14 are lit, the first light guide plate 11 or the second light guide plate 12 corresponding to the first light source 13 or the second light source 14 presents a brighter light emission state in the area near the first light incident side 112 or the second light incident side 122. For example Figure 2 as shown, when the second, third, and fourth second light sources 14 are lit, the areas of the first light guide plate 12 corresponding to these two second light sources 14 will emit light at positions near the second light incident side 112. However Figure 2 the division and presentation of the light emission areas are only for illustrative purposes and do not represent the actual light emission performance. Also, these area division lines are not actually visible to the naked eye. For the sake of illustration, in Figure 2 the dot pattern structure is omitted from the drawing and is hereby explained together. The aforementioned area corresponding to the first light source 13 can be understood as the area of the first light guide plate 11 corresponding to the main light emission axes of these two first light sources 13. The same applies to the second light guide plate 12 during application. In short, the first light guide plate 11 and the second light guide plate 12 can respectively cause a large amount of light emission in the areas relatively close to the first light incident side 112 and the second light incident side 122. Therefore, after the first light guide plate 11 and the second light guide plate 12 are stacked in a manner where the first light incident side 112 and the second light incident side 122 are oppositely arranged, the light emission effect can be controlled for all areas. In this way, according to the area touched by the user, the front light module 1 of the touch panel can form light emission corresponding to the touched area of the user, and thus has a tracking light emission effect of emitting light following the user's operation. When all the first light sources 13 and second light sources 14 are lit simultaneously, the first light guide plate 11 and the second light guide plate 12 will form a uniform planar light emission for display lighting purposes

[0031] Accordingly, through the specific dot pattern layout density characteristics and the lighting control of the first light source 13 and the second light source 14, a special light emission effect of forming light emission according to the user's touch trajectory can be achieved. Moreover, the front light module 1 of the touch panel selects components of the light guide plate size grade, so it has the advantage of being thin and is suitable for current electronic devices

[0032] Considering the assembly and bonding stability of the components, as well as the sensing and light-emitting performance during touch use, etc., the first light guide plate 11 can be adhered to the touch circuit board 2 through a first light-transmitting adhesive layer 15, and the second light guide plate 12 can be attached to the first light guide plate 11 through a second light-transmitting adhesive layer 16. The first light-transmitting adhesive layer 15 and the second light-transmitting adhesive layer 16 can, for example, be selected as optical adhesives (OCA, Optical Clear Adhesive), so as to have excellent adhesive fixing functions and light transmittance, and can allow light to penetrate while providing adhesive fixation.

[0033] Considering the requirement of thinning, the thickness of the first light-transmitting adhesive layer 15 can be set to 0.05 - 0.15 mm, for example, 0.1 mm, and the thickness of the second light-transmitting adhesive layer 16 can be set to 0.1 - 0.3 mm, for example, 0.2 mm. In this way, the adhesive strength and stability can be taken into account, and at the same time, the thickness performance will not be affected.

[0034] The thicknesses of the first light guide plate 11 and the second light guide plate 12 can be selected to be 0.3 - 0.5 mm, for example, 0.4 or 0.35 mm, etc., so as to meet the requirement of thinning and provide excellent light-emitting performance at the same time.

[0035] In addition, since the front light module 1 of the touch panel is arranged on the touch circuit board 2, that is, in the front, and is a component directly touched by the user, the front light module 1 of the touch panel can further include a protective member 17, and is attached to the second light guide plate 12 through a third light-transmitting adhesive layer 18 to protect the underlying first light guide plate 11, second light guide plate 12, etc. The protective member 17 can be made of materials such as glass, etc., to facilitate light transmission and have sufficient hardness and rigidity to protect the underlying components, and the third light-transmitting adhesive layer 18 is the same as the aforementioned first light-transmitting adhesive layer 15 and second light-transmitting adhesive layer 16, and can also be selected as an optical adhesive.

[0036] Regarding the thicknesses of the protective member 17 and the third light-transmitting adhesive layer 18, the present invention also provides corresponding examples. For example, the thickness of the protective member 17 can be 0.5 - 0.6 mm, and the thickness of the third light-transmitting adhesive layer 18 can be 0.05 - 0.15 mm. In this way, sufficient protection force can be provided, and at the same time, stable adhesive efficacy and light-transmitting effect are also achieved. In an implementation state, the thickness of the protective member 17 can be 0.55 mm, and the thickness of the third light-transmitting adhesive layer 18 can be 0.1 mm.

[0037] Please continue to refer to Figure 3 and Figure 4, which are respectively a schematic diagram of the decomposition of the touch panel front light module and an application schematic diagram of another implementation state of one embodiment of the utility model. In this implementation state, the touch panel front light module 1 also includes a fill light sheet 19 and a plurality of supplementary light sources 9. The fill light sheet 19 is arranged between the first light guide sheet 11 and the second light guide sheet 12 and has a fill light incident side 191 and a plurality of light isolating grooves 192. The light isolating grooves 192 are arranged at intervals. The supplementary light source 9 is arranged corresponding to the fill light incident side 191, and is used to provide side-entry light to the fill light sheet 19. Among them, the fill light incident side 191 is perpendicular to the first light incident side 112 and the second light incident side 122, and the light isolating grooves 192 are correspondingly located between any two adjacent supplementary light sources 9. When the supplementary light source 9 is lit, the area corresponding to the supplementary light source 9 on the fill light sheet 19 forms light output, and forms a superimposed light output effect with the first light guide sheet 11 or the second light guide sheet 12. Through the fill light sheet 19 and the supplementary light source 9, light can be provided in another direction, and the light-isolating groove 192 is provided on the fill light sheet 19 to prevent any supplementary light source 9 from affecting the left and right adjacent areas when it is turned on. The light-isolating groove 192 can be, for example, a V-shaped groove to provide an excellent light-isolating effect, and the manufacturing process is relatively simple. In addition, the supplementary light source 9 can be specifically arranged on a long strip circuit substrate to form a light bar structure. In summary, by providing the fill light sheet 19 and the supplementary light source 9, the tracking light output effect can be made more certain and obvious through the staggered light output areas. In addition, similar to the first light guide sheet 11 and the second light guide sheet 12, the area on the fill light sheet 19 corresponding to the supplementary light source 9 in principle refers to the area on the fill light sheet 19 corresponding to the main light output axis of the supplementary light source 9. For example, if Figure 4 As shown, when any two fourth light sources 13 and any two supplementary light sources 9 are turned on, the main light emitting axis areas of the second light guide plate 12 and the supplementary light plate 19 corresponding to the second light source 14 and the supplementary light source 9 will generate light, and these two light emitting areas (the area on the supplementary light plate 19 corresponding to the supplementary light source 9 and the area on the second light guide plate 12 corresponding to the second light source 14) will be staggered to form an overlapping area ( Figure 4 The overlapping area will form a stronger light according to the light of the two light sources, and then achieve a superimposed light effect in the overlapping area. The aforementioned overlapping area corresponds to the touch pressing position of the user. Based on the relatively strong light intensity in the overlapping area, combined with the light from the surrounding adjacent areas, a cross-shaped light performance can be roughly formed, that is, the middle is brighter and has a luminous effect of extending light in the four directions of front, back, left and right. In this way, another dynamic light performance can be provided when applied. Among them, Figure 4 The light output area division and presentation are for illustration purposes only and do not represent actual light output performance. Moreover, the area division lines are not actually visible to the naked eye and are used for illustration purposes only. Figure 4 The dot structure is omitted and explained together.

[0038] Please refer to the following togetherFigure 5 This is a schematic diagram of the assembly of the front light module of the touch panel in another implementation state of an embodiment of the present utility model. In this implementation state, the structures of another type of first light guide plate 11 and second light guide plate 12 are disclosed. Since the first light guide plate 11 and the second light guide plate 12 are sheet bodies with extremely thin thicknesses, in order to improve the light utilization rate, a plurality of first cones 1121 can protrude from the edge of the first light incident side 112, and the first cones 1121 correspond to the first light source 13. A plurality of second cones 1221 can also protrude from the edge of the second light incident side 122, and the second cones 1221 correspond to the second light source 14. Through the structures of the first cones 1121 and the second cones 1221, the effect of expanding the areas of the first light incident side 112 and the second light incident side 122 can be achieved, enabling the light of the first light source 13 and the second light source 14 to be incident on the first light guide plate 11 and the second light guide plate 12 as much as possible, thereby effectively improving the light utilization rate of the first light guide plate 11 and the second light guide plate 12 and making the light output energy more sufficient.

[0039] Next, please refer to Figure 6 This is an exploded schematic diagram of the front light module of the touch panel in another embodiment of the present utility model. The front light module 1 in this embodiment is also used to be disposed on a touch circuit board 2, and includes a first light guide plate 11, a second light guide plate 12, a plurality of first light sources 13, a plurality of second light sources 14, a plurality of third light sources 3, and a plurality of fourth light sources 4. The following is a detailed description of the front light module 1 of this embodiment.

[0040] The first light guide plate 11 is disposed on the touch circuit board 2. Multiple first light spots 111 are provided on the upper or lower surface of the first light guide plate 11. The first light guide plate 11 has a first light incident side 112 and a third light incident side 113, and the first light incident side 112 and the third light incident side 113 are oppositely arranged. The distribution density of the first light spots 111 shows a high-low-high-low change trend from the first light incident side 112 towards the third light incident side 113. The second light guide plate 12 is disposed on the first light guide plate 11. Multiple second light spots 121 are provided on the upper or lower surface of the second light guide plate 12. The second light guide plate 12 has a second light incident side 122 and a fourth light incident side 123, and the second light incident side 122 and the fourth light incident side 123 are oppositely arranged. Moreover, the second light incident side 122 and the third light incident side 113 are on the same side. The distribution density of the second light spots 121 shows a high-low-high-low change trend from the second light incident side 122 towards the fourth light incident side 123. The first light source 13 is disposed corresponding to the first light incident side 112 for providing side-incident light to the first light guide plate 11. The second light source 14 is disposed corresponding to the second light incident side 122 for providing side-incident light to the second light guide plate 12. The third light source 3 is disposed corresponding to the third light incident side 113 for providing side-incident light to the first light guide plate 11. The fourth light source 4 is disposed corresponding to the fourth light incident side 123 for providing side-incident light to the second light guide plate 12.

[0041] When the first light source 13 is lit, light exits from the area on the first light guide plate 11 corresponding to the first light source 13 according to the first light spots 111. When the second light source 14 is lit, light exits from the area on the second light guide plate 12 corresponding to the second light source 14 according to the second light spots 121. When the third light source 3 is lit, light exits from the area on the first light guide plate 11 corresponding to the third light source 3 according to the first light spots 111. When the fourth light source 4 is lit, light exits from the area on the second light guide plate 12 corresponding to the fourth light source 4 according to the second light spots 121. Thus, by lighting different first light source 13, second light source 14, third light source 3 and fourth light source 4, a tracking lighting effect is achieved. More specifically, according to the special density distribution state of the first light spots 111 and the second light spots 121, two areas with larger light output, that is, areas with higher distribution density of the first light spots 111 and the second light spots 121, will be respectively formed on the first light guide plate 11 and the second light guide plate 12. In this way, the front light module 1 of the touch panel has four areas with larger light output, and by controlling the operation of the first light source 13, second light source 14, third light source 3 and fourth light source 4, the front light module 1 of the touch panel forms light according to the touch and click position of the user. The application state can be referred to Figure 2As shown. When the first light source 13, the second light source 14, the third light source 3, and the fourth light source 4 are simultaneously lit, the first light guide plate 11 and the second light guide plate 12 form a uniform planar light output, and at this time, it can be used to provide display light. In this embodiment, a structural solution for controlling the light output of the light guide plate by using more positions and light sources is disclosed. In this architecture, a tracking light-emitting effect of emitting light according to the position of the user's touch operation can also be achieved, and the light guide plate is also made thin and light by using its size level. Other features such as the size or material selection of the touch circuit board 2, the first light guide plate 11, and the second light guide plate 12 and their corresponding effects are the same as those described in the previous embodiment. Please refer to the content of the previous paragraph for reference.

[0042] Similarly, in this embodiment, the first light guide plate 11 can be adhered to the touch circuit board 2 through a first light-transmitting adhesive layer 15, and the second light guide plate 12 is attached to the first light guide plate 11 through a second light-transmitting adhesive layer 16. The first light-transmitting adhesive layer 15 and the second light-transmitting adhesive layer 16 can be selected as optical adhesives. The thickness of the first light-transmitting adhesive layer 15 is 0.05 - 0.15 mm, and the thickness of the second light-transmitting adhesive layer 16 is 0.1 - 0.3 mm. The description of other more detailed technical features and effects is the same as that in the previous embodiment. Please refer to the corresponding previous paragraph for reference.

[0043] In addition, the thickness of the first light guide plate 11 and the second light guide plate 12 can also be 0.3 - 0.5 mm to have the advantages of being thin and light and having excellent light guide effects.

[0044] In this embodiment, the touch panel front light module 1 can also have a protective member 17, which is attached to the second light guide plate 12 through a third light-transmitting adhesive layer 18 to protect other components. The thickness of the protective member 17 can be further set to 0.5 - 0.6 mm, and the thickness of the third light-transmitting adhesive layer 18 can be 0.05 - 0.15 mm. The description of the detailed technical features and effects of the protective member 17 and the third light-transmitting adhesive layer 18 is the same as that in the previous embodiment. Please refer to the corresponding previous paragraph for reference.

[0045] Next, please continue to refer to Figure 7, which is an exploded schematic view of the touch panel front light module in another implementation state of another embodiment of the present utility model. In this implementation state, the touch panel front light module 1 further includes a supplementary light sheet 19 and a plurality of reinforcing light sources 9. The supplementary light sheet 19 is disposed between the first light guide sheet 11 and the second light guide sheet 12 and has a supplementary light incident side 191 and a plurality of light blocking grooves 192. The light blocking grooves 192 are arranged at intervals. The reinforcing light sources 9 are disposed corresponding to the supplementary light incident side 191 and are used to provide side-incident light to the supplementary light sheet 19. Among them, the supplementary light incident side 191 is perpendicular to the first incident side 112, the second incident side 122, the third incident side 113, and the fourth incident side 123, and the light blocking grooves 192 are correspondingly located between any two adjacent reinforcing light sources 9. When the reinforcing light sources 9 are lit, the area of the supplementary light sheet 19 corresponding to the reinforcing light sources 9 emits light, and a superimposed light emission effect is formed with the first light guide sheet 11 or the second light guide sheet 12. Similar to the previous embodiment, through the supplementary light sheet 19 and the reinforcing light sources 9, the tracking light emission effect can be made more accurate and obvious because when the supplementary light sheet 19 emits light, staggered light emission areas can be generated with the first light guide sheet 11 and the second light guide sheet 12, so that a superimposed light emission effect is achieved in this overlapping and staggered area, that is, a relatively brighter light emission performance. This overlapping area will correspond to the touch and press position of the user. The schematic diagram of the light emission application of this module stack structure can be referred to in conjunction with Figure 4 as shown. Similar to the previous embodiment, in the structure with the supplementary light sheet 19 and the reinforcing light sources 9, the light emission of the touch panel front light module 1 will generally form a cross shape, presenting another light emission pattern. The more detailed technical features and corresponding effects are the same as those described in the previous embodiment. Please refer to the content of the previous paragraph in conjunction.

[0046] Please also refer to Figure 8 , which is an assembly schematic view of another implementation state of another embodiment of the present utility model. In this implementation state, the first light source 13 and the fourth light source 4 are disposed on the upper and lower sides of the same circuit board, and the second light source 14 and the third light source 3 are disposed on the upper and lower sides of the same circuit board. Through this structural design, the first light source 13 and the fourth light source 4 can form an integrated light bar, and the second light source 14 and the third light source 3 can also form an integrated light bar, further simplifying the overall structure and being more conducive to assembly and manufacturing.

[0047] In summary, for the touch panel front light module with a tracking lighting effect of the present utility model, through the design of a thin double light guide plate and a special dot layout density, combined with the lighting control of the light source, light can be emitted according to the user's touch click trajectory, providing a dynamic lighting effect, thereby enhancing the aesthetics and functional performance of touch electronic products. Moreover, the first light guide plate and the second light guide plate are of sheet material grade, that is, the thickness specification is a few tenths of a millimeter, so it also meets the market demand for the trend of thinning. Regarding the further technical features that can be added to each component, the present utility model has also proposed many examples. For example, a supplementary light sheet and a vertically arranged reinforcing light source can be added between the first light guide plate and the second light guide plate to form a superimposed light-emitting area with the first light guide plate and the second light guide plate, thereby enhancing the light-emitting brightness performance at the position where the user touches and clicks; or a light-transmitting adhesive layer can be selected as the fixing element between the first light guide plate and the touch circuit board, and between the first light guide plate and the second light guide plate, so as to have a firm adhesiveness and not affect the light emission at the same time; in addition, in order to effectively protect each component and extend the service life of the module, a protective part can be provided on the second light guide plate, and a light-transmitting adhesive layer is also selected to fix the protective part to the second light guide plate. Regarding the dimensions of each component, the present utility model has also proposed relevant disclosures. For example, the thickness of the first light guide plate and the second light guide plate is 0.3 - 0.5 mm, the thickness of the first light-transmitting adhesive layer is 0.05 - 0.15 mm, the thickness of the second light-transmitting adhesive layer is 0.1 - 0.3 mm, and when a protective part is provided, the thickness of the protective part is 0.5 - 0.6 mm, and the thickness of the third light-transmitting adhesive layer is 0.05 - 0.15 mm, etc. Under the above size conditions, the touch panel front light module can have the advantage of thinning while having excellent assembly stability and light-emitting performance.

[0048] Description of Reference Numerals

[0049] 1 Touch panel front light module

[0050] 11 First light guide plate

[0051] 111 First dot

[0052] 112 First light-incident side

[0053] 113 Third light-incident side

[0054] 12 Second light guide plate

[0055] 121 Second dot

[0056] 122 Second light-incident side

[0057] 123 Fourth light-incident side

[0058] 13 First light source

[0059] 14 Second light source

[0060] 15 First light-transmissive adhesive layer

[0061] 16 Second light-transmissive adhesive layer

[0062] 17 Protective member

[0063] 18 Third light-transmissive adhesive layer

[0064] 19 Light supplement sheet

[0065] 191 Light supplement light-incident side

[0066] 192 Light isolation groove

[0067] 2 Touch control circuit board

[0068] 3 Third light source

[0069] 4 Fourth light source

[0070] 9 Reinforcing light source

Claims

1. A touch panel front light module with tracking lighting effect, used to be arranged on a touch circuit substrate, characterized in that: Include: A first light guide sheet is disposed on the touch circuit substrate, wherein a plurality of first dots are disposed on an upper surface or a lower surface of the first light guide sheet, and the first light guide sheet has a first light incident side, wherein the arrangement density of the first dots decreases from the first light incident side toward the other side; A second light guide sheet is disposed on the first light guide sheet, the second light guide sheet has a plurality of second lattice dots on an upper side or a lower side thereof, and the second light guide sheet has a second light incident side, wherein the arrangement density of the second lattice dots decreases from the second light incident side toward the other side, and the first light incident side and the second light incident side are disposed opposite to each other; a plurality of first light sources, arranged corresponding to the first light incident side, for providing side-entry light to the first light guide plate; and A plurality of second light sources are arranged corresponding to the second light incident side, and are used to provide side-entry light to the second light guide plate; Among them, the thickness of the first light guide sheet and the second light guide sheet is 0.3-0.5mm, and the total thickness of the first light guide sheet, the second light guide sheet and the touch circuit substrate is 3.75-4.55mm, and when the first light source is lit, the area on the first light guide sheet corresponding to the first light source forms light according to the first grid dots, and when the second light source is lit, the area on the second light guide sheet corresponding to the second light source forms light according to the second grid dots, thereby achieving a tracking lighting effect by lighting different first light sources and second light sources; and when the first light source and the second light source are lit at the same time, the first light guide sheet and the second light guide sheet form uniform planar light.

2. The touch panel front light module with tracking lighting effect according to claim 1, characterized in that: The invention also includes a fill light sheet and a plurality of supplementary light sources, wherein the fill light sheet is arranged between the first light guide sheet and the second light guide sheet and has a fill light incident side and a plurality of light isolating grooves, wherein the light isolating grooves are arranged at intervals, and the supplementary light source is arranged corresponding to the fill light incident side, so as to provide side-entry light to the fill light sheet; wherein the fill light incident side is perpendicular to the first light incident side and the second light incident side, and the light isolating grooves are correspondingly located between any two adjacent supplementary light sources, and when the supplementary light source is turned on, light is emitted from the area on the fill light sheet corresponding to the supplementary light source, and a superimposed light emission effect is formed with the first light guide sheet or the second light guide sheet.

3. The touch panel front light module with tracking lighting effect according to claim 1, characterized in that: The first light guide plate is adhered to the touch circuit substrate through a first light-transmitting adhesive layer, and the second light guide plate is attached to the first light guide plate through a second light-transmitting adhesive layer; and the thickness of the first light-transmitting adhesive layer is 0.05-0.15 mm, and the thickness of the second light-transmitting adhesive layer is 0.1-0.3 mm.

4. The touch panel front light module with tracking lighting effect according to claim 1, characterized in that: It also includes a protective member, which is attached to the second light guide plate through a third light-transmitting adhesive layer; the thickness of the protective member is 0.5-0.6 mm, and the thickness of the third light-transmitting adhesive layer is 0.05-0.15 mm.

5. The touch panel front light module with tracking lighting effect according to claim 1, characterized in that: The first light incident side edge protrudes to form a plurality of first cones, and the first cones correspond to the first light source; the second light incident side edge protrudes to form a plurality of second cones, and the second cones correspond to the second light source.

6. A touch panel front light module with tracking lighting effect, used to be arranged on a touch circuit substrate, characterized in that: Include: A first light guide sheet is disposed on the touch circuit substrate, wherein a plurality of first dots are provided on an upper surface or a lower surface of the first light guide sheet, and the first light guide sheet has a first light incident side and a third light incident side, the first light incident side and the third light incident side are disposed opposite to each other, and an arrangement density of the first dots presents a high-low-high-low variation trend from the first light incident side toward the third light incident side; a second light guide sheet, disposed on the first light guide sheet, having a plurality of second lattice dots on an upper surface or a lower surface of the second light guide sheet, and having a second light entrance side and a fourth light entrance side, the second light entrance side and the fourth light entrance side being disposed opposite to each other, and the second light entrance side and the third light entrance side being located on the same side, and the arrangement density of the second lattice dots showing a high-low-high-low variation trend from the second light entrance side toward the fourth light entrance side; A plurality of first light sources are arranged corresponding to the first light incident side and are used to provide side-entry light to the first light guide sheet; A plurality of second light sources are arranged corresponding to the second light incident side, and are used to provide side-entry light to the second light guide plate; A plurality of third light sources are arranged corresponding to the third light incident side, and are used to provide side-entry light to the first light guide sheet; as well as a plurality of fourth light sources, arranged corresponding to the fourth light incident side, for providing side-entry light to the second light guide sheet; Among them, the thickness of the first light guide sheet and the second light guide sheet is 0.3-0.5mm, and the total thickness of the first light guide sheet, the second light guide sheet and the touch circuit substrate is 3.75-4.55mm, and when the first light source is lit, the area corresponding to the first light source on the first light guide sheet forms light according to the first grid dots, when the second light source is lit, the area corresponding to the second light source on the second light guide sheet forms light according to the second grid dots, when the third light source is lit, the area corresponding to the third light source on the first light guide sheet forms light according to the first grid dots, when the fourth light source is lit, the area corresponding to the fourth light source on the second light guide sheet forms light according to the second grid dots, and then the tracking lighting effect is achieved by lighting different first light sources, second light sources, third light sources and fourth light sources; and when the first light source, the second light source, the third light source and the fourth light source are lit at the same time, the first light guide sheet and the second light guide sheet form uniform planar light.

7. The touch panel front light module with tracking lighting effect according to claim 6, characterized in that: The invention also includes a fill light sheet and a plurality of supplementary light sources, wherein the fill light sheet is arranged between the first light guide sheet and the second light guide sheet and has a fill light incident side and a plurality of light isolating grooves, wherein the light isolating grooves are arranged at intervals, and the supplementary light source is arranged corresponding to the fill light incident side, so as to provide side-entry light to the fill light sheet; wherein the fill light incident side is perpendicular to the first light incident side, the second light incident side, the third light incident side and the fourth light incident side, and the light isolating grooves are correspondingly located between any two adjacent supplementary light sources, and when the supplementary light source is turned on, light is emitted from the area on the fill light sheet corresponding to the supplementary light source, and a superimposed light emission effect is formed with the first light guide sheet or the second light guide sheet.

8. The touch panel front light module with tracking lighting effect according to claim 6, characterized in that: The first light guide plate is adhered to the touch circuit substrate through a first light-transmitting adhesive layer, and the second light guide plate is attached to the first light guide plate through a second light-transmitting adhesive layer; and the thickness of the first light-transmitting adhesive layer is 0.05-0.15 mm, and the thickness of the second light-transmitting adhesive layer is 0.1-0.3 mm.

9. The touch panel front light module with tracking lighting effect according to claim 6, characterized in that: It also includes a protective member, which is attached to the second light guide plate through a third light-transmitting adhesive layer; the thickness of the protective member is 0.5-0.6 mm, and the thickness of the third light-transmitting adhesive layer is 0.05-0.15 mm.

10. The touch panel front light module with tracking lighting effect according to claim 6, characterized in that: The first light source and the fourth light source are arranged on upper and lower sides of the same circuit substrate, and the second light source and the third light source are arranged on upper and lower sides of the same circuit substrate.

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