Light-emitting module of touch panel

Abstract

A light-emitting module of a touchpad comprises a light blocking sheet and a light guide sheet which are arranged on a circuit board. The circuit board comprises a first light-emitting element. The light blocking sheet is provided with a hollow part and a light blocking part. The light guide sheet is arranged in the hollow part and is provided with a first light incident part and a light guide part, the first light incident part comprises a first side surface, a second side surface and a third side surface, the first side surface is adjacent to the first light-emitting element, the second side surface and the third side surface are respectively connected with the first side surface, the second side surface and the third side surface extend to form an included angle, and the included angle is smaller than the light-emitting angle of the first light-emitting element; the light blocking part is adjacent to the second or third side surface. The projection angle of the light of the first light-emitting element is limited through the first light incident part, so that the light is incident to the light guide part to display a light-emitting pattern without stray light.

Description

Technical Field

[0001] A lighting module, especially a lighting module of a touchpad. Background Art

[0002] Electronic products such as notebook computers usually have physical buttons and touch panels. With the development of the thinning of portable electronic products, the available space on the body is relatively reduced. Therefore, a thin and light notebook computer may display virtual buttons and visual images on the touch panel to save the space of physical buttons and improve the operation convenience of users. On the touch panel, a backlight component is used to display virtual buttons and visual images for users to operate, and the virtual buttons or visual images will emit stray light and affect other surrounding areas. Summary of the Invention

[0003] In view of this, according to some embodiments of the present invention, a lighting module of a touchpad is provided, which is suitable for when a lighting pattern is lit, there is no stray light around the lighting pattern. In some embodiments, the inventors recognize that currently, the lighting patterns on the touchpad can emit light in zones and are independently controlled, and the light effects do not affect each other. The combination of a spacer structure and a single or several independent light guide plates is used. The spacer is placed between each light guide plate or pattern, so that when the pattern of the light guide plate emits light, it will not be affected by the stray light of other patterns. However, as long as the lighting patterns of the light guide plates are separated by spacers, the lighting patterns cannot be continuous. In the case of no spacer, when the light source is not fully on and only part of it is on, there will be stray light affecting other positions that should not emit light around the lighting pattern.

[0004] According to some embodiments of the present invention, a lighting module of a touchpad includes a circuit board, a light blocking sheet, and a light guide plate. The circuit board has a first light-emitting element. The light blocking sheet is disposed on the circuit board, and the light blocking sheet has a hollow portion and a light blocking portion. The light guide plate is received in the hollow portion. The light guide plate has a first light-incident portion and a light guide portion. The first light-incident portion includes a first side surface, a second side surface, and a third side surface. The first side surface is adjacent to the first light-emitting element. The second side surface and the third side surface are respectively connected to the first side surface, and an included angle is formed by the extensions of the second side surface and the third side surface, and the angle of the included angle is less than the light-emitting angle of the first light-emitting element. The light blocking portion is disposed adjacent to the second side surface or the third side surface.

[0005] According to some embodiments of the present invention, the lighting module of the touchpad further includes a reflective layer or an absorptive layer disposed between the circuit board and the light blocking sheet.

[0006] According to some embodiments of the present invention, the first light-incident portion includes a first region and a second region. The first region is adjacent to the first light-emitting element. The second region is connected to the light guide portion. The first region has a trapezoidal or gradually expanding geometric shape, and the first length at which the second region interfaces with the first region is greater than the second length of the first side surface.

[0007] According to some embodiments of the present invention, the light-emitting module of the touchpad further has a light-blocking structure, and the light-blocking structure is disposed on one side surface of the second region.

[0008] According to some embodiments of the present invention, the light guide plate further includes a second light-emitting element and a second light-incident portion. The second light-incident portion includes a third region and a fourth region. The third region is adjacent to the second light-emitting element, the fourth region is connected to the light guide portion, and the light-blocking portion is disposed between the first region and the third region.

[0009] According to some embodiments of the present invention, a light-blocking structure is disposed on the side surface of the second region adjacent to the fourth region.

[0010] According to some embodiments of the present invention, the light guide plate further includes an opening, and the opening is disposed between the second region and the fourth region.

[0011] According to some embodiments of the present invention, the light-emitting module of the touchpad further includes a cover plate. The cover plate is disposed on the light-blocking sheet and the light guide plate. A reflective region and a light-transmitting region are disposed on the surface of the cover plate facing the light-blocking sheet. The light-transmitting region corresponds to the light guide portion, and the first light-incident portion corresponds to the reflective region. The area of the light-transmitting region is smaller than the area of the light guide portion.

[0012] According to some embodiments of the present invention, the second side surface or the third side surface is a non-planar surface.

[0013] Thus, according to some embodiments, by restricting the projection angle of the light emitted by the light-emitting element through the first light-incident portion of the light guide plate, the light is incident on the light guide portion of the light guide plate to form an independent light-emitting pattern and there will be no stray light around it. In addition, according to some embodiments, through the respective light-blocking structures of the light guide plate, the lights emitted by the plurality of light-emitting elements are turned at the intersections and do not overlap, so that no stray light overflows at the connection portions of the multi-segment light-emitting patterns, avoiding affecting the light effects of the adjacent light-emitting patterns, and forming a seamless connection of the respective light-emitting patterns, realizing a continuous and non-intermittent light-emitting pattern effect.

[0014] The following is described in detail through specific embodiments in conjunction with the accompanying drawings, and it will be easier to understand the purpose, technical content, features and achieved effects of the present invention. Description of the Drawings

[0015] Figure 1 is an exploded view showing a light-emitting module having a single light-emitting element according to some embodiments;

[0016] Figure 2 is a top view showing a light-emitting module having a single light-emitting element emitting light according to some embodiments;

[0017] Figure 3 is an exploded view showing a light-emitting module having a plurality of light-emitting elements according to some embodiments;

[0018] Figure 4 is a top view schematic diagram showing a plurality of light-emitting elements of a light-emitting module emitting light according to some embodiments;

[0019] Figure 5A is a schematic diagram showing Figure 4 a cross-sectional view of the A-A lead;

[0020] Figure 5B is an external view schematic diagram showing a plurality of light-emitting elements of a light-emitting module emitting light according to some embodiments;

[0021] Figure 6 is a top view schematic diagram showing a light-blocking structure of a light-emitting module according to some embodiments;

[0022] Figure 7 is a schematic diagram showing Figure 6 a cross-sectional view of the B-B lead;

[0023] Figure 8 is a partial schematic diagram showing an arc portion with a refraction structure of a light-emitting module according to some embodiments;

[0024] Figure 9 is a schematic diagram showing Figure 8 an enlarged view of the area marked by circle C;

[0025] Figure 10 is a partial schematic diagram showing an opening with a refraction structure of a light-emitting module according to some embodiments;

[0026] Figure 11 is a schematic diagram showing Figure 10 an enlarged view of the area marked by circle D;

[0027] Figure 12 is an enlarged schematic diagram showing a light guide plate having a plurality of grooves according to some embodiments;

[0028] Figure 13 is a partial schematic diagram showing a microstructure on the second side and the third side of a light guide plate according to some embodiments;

[0029] Figure 14 is a top view schematic diagram showing a light-emitting module having a funnel-shaped first light-incident portion according to some embodiments;

[0030] Figure 15 is a top view schematic diagram showing a light-emitting module having a first light-incident portion with a narrowed channel according to some embodiments.

[0031]

Symbol Description

[0032] 1: Circuit board

[0033] 10: Touch control circuit

[0034] 11: First light-emitting element

[0035] 12: Second light-emitting element

[0036] 2: Light-shielding sheet

[0037] 21: Hollowed-out part

[0038] 22: Light-shielding part

[0039] 3: Light guide plate

[0040] 31: First light-incident part

[0041] 31a: First side

[0042] 31b: Second side

[0043] 31b1: Microstructure

[0044] 31c: Third side

[0045] 31c1: Microstructure

[0046] 311: First area

[0047] 311a: Channel

[0048] 312: Second area

[0049] 315: Light-blocking structure

[0050] 32: Second light-incident part

[0051] 323: Third area

[0052] 324: Fourth area

[0053] 325: Light-blocking structure

[0054] 34: Light guiding part

[0055] 341: Dot area

[0056] 35: Refraction structure

[0057] 351: Arc part

[0058] 352: Opening

[0059] 3521: Straight face

[0060] 3522: Curved face

[0061] 36: Hollowed-out area

[0062] 37: Groove

[0063] 41: Reflective layer

[0064] 42: Light absorption layer

[0065] 5: Cover plate

[0066] 51: Reflective area

[0067] 54: Translucent area

[0068] C1: Median line

[0069] D1: First length

[0070] D2: Second length

[0071] θ1: Included angle

[0072] θ2: Emission angle

[0073] L: Light ray

[0074] P: Light-emitting pattern

[0075] X: First axis

[0076] Y: Second axis

[0077] Z: Third axis Detailed implementation manners

[0078] The following will detail each embodiment of the present invention and be illustrated in conjunction with the accompanying drawings. In the description of the specification, many specific details are provided to enable readers to have a more complete understanding of the present invention; however, the present invention may still be implemented on 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 should be particularly noted that the drawings are only for illustrative purposes and do not represent the actual size or quantity of the elements. Some details may not be fully drawn to make the drawings concise.

[0079] Refer to Figure 1 , which is an exploded view of a lighting module having a single lighting element. In some embodiments, the lighting module can be applied to a touchpad of a tablet computer, a notebook computer, a game console, or a household appliance, etc. The lighting module displays a light-emitting pattern P (such as Figure 2 using a gray block to indicate the area of the light-emitting pattern P) on the touchpad. The light-emitting pattern P is a virtual button or a visual image, and can display, for example but not limited to, a computer function menu for segmented control and display the corresponding status. For example, the lighting module can display several fan / volume indicator lights in a partitioned or non-partitioned manner. For example: when 1 fan / volume symbol is displayed for the user to view / select, it means that the current fan speed / speaker volume is small. However, when 6 light-emitting patterns P (such as Figure 4 and Figure 5BSix consecutive illuminated graphics P) of the fan / volume symbol are displayed on the left side for the user to view / select, indicating that the current fan speed / speaker volume is relatively high. The user can touch to adjust the fan speed / speaker volume in segments.

[0080] For a clearer description of this case, in the schematic drawings provided for this case, the first axis X is the X-axis of the three-dimensional coordinate system, the second axis Y is the Y-axis of the three-dimensional coordinate system, and the third axis Z is the Z-axis of the three-dimensional coordinate system.

[0081] Please refer to Figure 1 and Figure 2 , Figure 2 is a top view schematic diagram of the lighting module with a single lighting element. The lighting module of the touchpad includes a circuit board 1, a light blocking sheet 2, and a light guide sheet 3. The circuit board 1 includes a touch circuit 10, and a first lighting element 11 is provided on the circuit board 1. The first lighting element 11 can be, but is not limited to, a light emitting diode element.

[0082] Please refer to Figure 1 and Figure 2 , the light blocking sheet 2 is disposed on the circuit board 1. The light blocking sheet 2 has a hollow portion 21 and a light blocking portion 22. The light guide sheet 3 is received in the hollow portion 21. The light blocking portion 22 of the light blocking sheet 2 is located at the outer periphery of the light guide sheet 3. The light blocking sheet 2 is a ring structure and surrounds the light guide sheet 3 on all sides. In some embodiments, the light blocking portion 22 of the light blocking sheet 2 is relatively higher than the light guide sheet 3 and adjacent to the upper cover plate 5. Herein, the light blocking sheet 2 can prevent the light L emitted by the first lighting element 11 (in Figure 2 the area where the light L is emitted is indicated by a dot area) from leaking, thereby avoiding light leakage. In some embodiments, the material of the light blocking portion 22 of the light blocking sheet 2 can be an opaque or light-absorbing plastic, such as, but not limited to: polycarbonate (PC).

[0083] Please refer to Figure 1 and Figure 2 , the light guide sheet 3 has a first light incident portion 31 and a light guiding portion 34. The first light incident portion 31 and the light guiding portion 34 are adjacent to each other. In some embodiments, the light guiding portion 34 is provided with a dot area 341. The dot area 341 corresponds to the surface of the light guiding portion 34, and the dot area 341 is used to change the propagation direction of the incident light L so that the light L is projected onto the surface of the light guiding portion 34. Thus, when the light L emitted by the first lighting element 11 is projected along the first axis X direction, the light L emitted by the first lighting element 11 passes through the refraction of a plurality of dot areas 341, reducing the light L from continuing to propagate around the light guiding portion 34 and reaching the periphery of the light guiding portion 34 through total reflection, preventing other stray light around the light guiding portion 34, and improving the problem of adjacent light interference and afterimages occurring around the light guiding portion 34.

[0084] In some embodiments, the dot area 341 has a plurality of microstructures, which are formed by a plurality of dot points (or light dot points), and can be convex dot points or concave dot points, but are not limited thereto, and can be of any shape, such as: irregular shape, cone shape, square shape, triangle shape, trapezoid shape, etc. The shape, size, the spacing between adjacent convex dot points and / or the spacing between adjacent concave dot points of each dot point can be adjusted according to the light shape emitted by the first light emitting element 11, the shape of the light transmissive area 54 when viewed from above, the material of the light guide plate 3 and its surface roughness, etc. The above adjustments can be obtained through experiments to obtain a better design scheme.

[0085] Please refer to Figure 1 and Figure 2 , the first light incident portion 31 of the light guide plate 3 includes a first side surface 31a, a second side surface 31b and a third side surface 31c. The top views of the first side surface 31a, the second side surface 31b and the third side surface 31c are generally trapezoidal. The first side surface 31a is adjacent to the first light emitting element 11, the light emitting surface of the first light emitting element 11 faces the first side surface 31a, the first side surface 31a is parallel to the light emitting surface, and the midpoint of the first side surface 31a substantially corresponds to the midpoint of the light emitting surface. The second side surface 31b and the third side surface 31c are respectively connected to the first side surface 31a. Wherein, an included angle θ1 is formed by the extensions of the second side surface 31b and the third side surface 31c, and the angle of the included angle θ1 is smaller than the light emitting angle θ2 of the first light emitting element 11.

[0086] Please refer to Figure 1 and Figure 2 , the light blocking plate 2 itself has the function of blocking light. When the light blocking plate 2 is combined with the light guide plate 3, the light blocking plate 2 surrounds the periphery of the light guide plate 3, and the light blocking portion 22 of the light blocking plate 2 is disposed adjacent to the second side surface 31b or the third side surface 31c or the outer sides of both of them. Thereby, when the light L emitted by the first light emitting element 11 is projected along the first axis X direction, the light blocking portion 22 outside the second side surface 31b or the third side surface 31c blocks the light L of the first light emitting element 11, so that the light L propagates in the region between the second side surface 31b and the third side surface 31c of the first light incident portion 31.

[0087] For a clearer description of the present case, in the schematic drawings provided for the present case, the direction from the first light-incident portion 31 to the light guide portion 34 will be referred to as the first axis X direction (i.e., the X-axis direction shown in the figure, or the front-back direction). The second side surface 31b and the third side surface 31c extend from the position of the first side surface 31a in an inclined and expanding manner in the first axis X direction, and the direction perpendicular to the first axis X on the same plane is referred to as the second axis Y direction (i.e., the Y-axis direction shown in the figure, or the up-down direction). In addition, the direction perpendicular to both the first axis X and the second axis Y is referred to as the third axis Z direction (i.e., the Z-axis direction shown in the figure, or the left-right direction). The light-blocking sheet 2 and the light guide sheet 3 are respectively arranged with the circuit board 1 in the second axis Y direction.

[0088] Please refer to Figure 1 and Figure 2 , in some embodiments, the included angle θ1 between the second side surface 31b and the third side surface 31c of the light guide sheet 3 is set according to the size of the light-emitting pattern P to be presented. The larger the included angle θ1, the larger the light-emitting pattern P that can be presented with a larger range of the first light-incident portion 31 and the light guide portion 34. Taking the multi-segment light-emitting pattern P as an example, when the included angle θ1 is smaller, the more segments of the light-emitting pattern P that can be presented are more dense, the higher the fineness of each light-emitting pattern P, and more segments of the light-emitting pattern P can be presented.

[0089] In some embodiments, the distance (the distance in the first axis X direction) between the first light-emitting element 11 and the light guide portion 34 of the light guide sheet 3 can be adjusted according to factors such as the light-emitting angle (view angle), light-emitting intensity of the first light-emitting element 11, the included angle θ1 between the second side surface 31b and the third side surface 31c, the lengths and widths of the second side surface 31b and the third side surface 31c, etc., to present the required fineness of the light-emitting pattern P. When a high-fineness light-emitting pattern P is required, the distance between the first light-emitting element 11 and the light guide portion 34 can be adjusted to be closer, and the lengths of the second side surface 31b and the third side surface 31c can be set to be shorter.

[0090] Please refer to Figure 1 and Figure 2 , in some embodiments, the first light-incident portion 31 of the light guide sheet 3 includes a first region 311 and a second region 312. The first region 311 and the second region 312 are respectively surrounded by the first side surface 31a, the second side surface 31b, and the third side surface 31c. The first region 311 is adjacent to the first light-emitting element 11, and the second region 312 is connected to the light guide portion 34. Among them, the first region 311 is slightly trapezoidal or has a geometric shape with a gradually expanding shape. The first length D1 where the second region 312 is adjacent to the first region 311 is greater than the second length D2 of the first side surface 31a. The second region 312 is rectangular in shape, but not limited thereto.

[0091] Please refer to Figure 1 andFigure 2 , in some embodiments, the first side surface 31a, the second side surface 31b, and the third side surface 31c of the first light-incident portion 31 form a funnel-shaped or trapezoidal light-gathering structure. The first region 311 and the second region 312 of the first light-incident portion 31 are located in the light-gathering structure, and the light-gathering structure can limit the projection angle of the light L emitted by the first light-emitting element 11. Among them, the overall shape of the first region 311 and the second region 312 of the first light-incident portion 31 is slightly trapezoidal, funnel-shaped (or gradually expanding shape), or a combination thereof, which will be described later.

[0092] Please refer to Figure 1 and Figure 2 , in some embodiments, the light-emitting module of the touchpad further includes a reflective layer 41 (as shown in Figure 1 ) or an absorptive layer 42 (as shown in Figure 3 ) disposed between the circuit board 1 and the light-shielding sheet 2. The reflective layer 41 is used to prevent the light L entering the light guide plate 3 from being emitted from the bottom of the light guide plate 3. The reflective layer 41 can be presented by printing or coating the circuit board 1, or the reflective layer 41 can be a separate reflective sheet element. The reflective sheet can be colored, and the color scale ranges from white to black to adjust the reflectivity. The reflective sheet with adjusted reflectivity is used to reflect the light L and prevent the phenomenon of light halo. In some embodiments, the absorptive layer 42 is made of a material with light-absorbing properties. Thus, the absorptive layer 42 absorbs the light L from the first light-incident portion 31 of the light guide plate 3 or weakens the light intensity value of the light L, so as to prevent the light L from continuing to propagate toward the light-guiding portion 34 of the light guide plate 3 and reaching the periphery of the light-guiding portion 34 through total reflection. That is, the absorptive layer 42 serves as a light-reducing structure around the light-guiding portion 34 to improve the problem of adjacent light interference and afterimage.

[0093] Please refer to Figure 1 and Figure 2 , in some embodiments, the light-emitting module of the touchpad further includes a cover plate 5. The cover plate 5 is disposed on the light-shielding sheet 2 and the light guide plate 3. The light-shielding sheet 2 and the light guide plate 3 are respectively arranged in the second axis Y direction with the cover plate 5. The cover plate 5 is located above the light guide plate 3, and the light-shielding sheet 2 is located between the cover plate 5 and the circuit board 1. A reflective region 51 and a light-transmitting region 54 are provided on the surface of the cover plate 5 facing the light-shielding sheet 2. The light-transmitting region 54 corresponds to the light-guiding portion 34, and the first light-incident portion 31 corresponds to the reflective region 51. In some embodiments, the area of the light-transmitting region 54 is smaller than the area of the light-guiding portion 34, and the light-transmitting region 54 can be of any shape, such as an irregular shape, a cone shape, a square shape, a triangle shape, or a trapezoid shape. In some embodiments, the surface of the cover plate 5 is subjected to a smoothing treatment and / or a hardening treatment to facilitate the user's touch and / or improve the wear resistance, and the material of the cover plate 5 can be, but is not limited to, a transparent or semi-transparent material, such as, but not limited to, a glass or a polyester film (Mylar) and other film sheets.

[0094] Please refer to Figure 1 andFigure 2 , when the first light emitting element 11 emits light L (in Figure 2 When the light L is emitted from the first light entrance portion 31 of the light guide plate 3 (with the dotted area indicating the area where the light L is emitted), the second side surface 31b and the third side surface 31c of the first light entrance portion 31 limit the projection angle of the light L emitted by the first light-emitting element 11, so that the light L is collected at the first light entrance portion 31 and is incident on the light guide portion 34 of the light guide plate 3 without divergence. The light L is reflected by the reflective layer 41 and penetrates the light-transmitting area 54 of the cover plate 5 on the light guide plate 3, and a predetermined luminous pattern P is displayed in the light-transmitting area 54. There will be no stray light around the luminous pattern P. If there is stray light, the brightness of the stray light area will be different from the brightness of the normal luminous pattern P area. In this way, the afterimage problem around the luminous pattern P on the touch panel is improved, so that the light-transmitting area 54 on the cover plate 5 can display a predetermined pattern, so as to facilitate the user to view / touch the cover plate 5.

[0095] Please refer to Figures 3 to 5B , Figure 3 is a schematic diagram of a light-emitting module having multiple light-emitting elements. In order to clearly show the light-emitting state and the non-light-emitting state of the light-emitting element, Figure 4 The left side shows multiple continuous luminous patterns P, while the right side does not show luminous patterns P. Figure 5A For Figure 4 In some embodiments, the light emitting module of the touch panel can be used to display a plurality of continuous light emitting patterns P, each light emitting pattern P can be as shown in Figure 4 and Figure 5B The continuous luminous patterns P are presented in the same color gradient area, or the luminous patterns P can be presented in different colors. The following is an example in which the light guide plate 3 also includes a second light incident portion 32 and a second light emitting element 12. The configuration of the second light incident portion 32 and the second light emitting element 12 of the light guide plate 3 is the same as the configuration of the first light incident portion 31 and the first light emitting element 11. In addition, the shape of the second light incident portion 32 can be the same as or different from the shape of the first light incident portion 31. For example, the shape of the second light incident portion 32 is as follows Figure 14 is funnel-shaped, or the second light incident portion 32 is as follows Figure 15 has a shape with a narrowing channel.

[0096] Please refer to Figure 3 and Figure 4 In some embodiments, the second light incident portion 32 includes a third area 323 and a fourth area 324, the third area 323 is adjacent to the second light emitting element 12, the fourth area 324 is connected to the light guiding portion 34, and the light blocking portion 22 is disposed between the first area 311 and the third area 323.

[0097] In some embodiments, in Figure 3 and Figure 4 ​​​On the right side of the light guide plate 3, the first light incident portion 31 and the second light incident portion 32 are respectively arranged on a single side of the light guide portion 34 and are arranged side by side vertically in the third axis Z direction. The first light incident portion 31 and the second light incident portion 32 are connected to each other and connected to the light guide portion 34, and the first light emitting element 11 and the second light emitting element 12 emit light rays L toward the light guide portion 34 from the same direction of the first axis X.

[0098] In some embodiments, in Figure 3 and Figure 4 On the left side of the light guide plate 3, the first light incident portion 31 and the second light incident portion 32 are respectively arranged on two sides of the light guide portion 34. And the first light incident portion 31 and the second light incident portion 32 are arranged in a staggered manner on two sides of the light guide portion 34. The staggered positions are set at two points on the same center line C1 where the opposite side ends of the first light incident portion 31 and the second light incident portion 32 are located respectively. The center line C1 is perpendicular to the axis of the light guide portion 34 (the third axis Z direction), and the first light emitting element 11 and the second light emitting element 12 emit light rays L toward the light guide portion 34 in the direction of the first axis X in a facing direction. Since the first light incident portion 31 and the second light incident portion 32 respectively correspond to different positions of the light guide portion 34, the respective light emitting patterns P formed by the light rays L in the light guide portion 34 are relatively located at different positions and do not overlap.

[0099] Please refer to Figure 3 and Figure 4 , when the second light emitting element 12 emits the light ray L through the second light incident portion 32 of the light guide plate 3, the side surfaces of the second light incident portion 32 limit the projection angle of the light ray L emitted by the second light emitting element 12, so that the light ray L is incident on the light guide portion 34 of the light guide plate 3. The light ray L penetrates the light transmissive area 54 of the cover plate 5 on the light guide plate 3, and a predetermined light emitting pattern P is displayed in the light transmissive area 54. There will be no stray light around the light emitting pattern P. If there is stray light, the brightness of the stray light area is different from the brightness of the normal light emitting pattern P area, thereby improving the afterimage problem around the light emitting pattern P on the touchpad. When the light ray L of the first light emitting element 11 presents a first light emitting pattern P and the light ray L of the second light emitting element 12 presents a second light emitting pattern P, the first light emitting pattern P and the second light emitting pattern P can be seamlessly connected without obstruction, so that a predetermined continuous pattern (such as Figure 5B shown) is displayed in the light transmissive area 54 of the cover plate 5, presenting a light effect of a seamless continuous pattern, which is convenient for the user to view / touch and operate from the cover plate 5.

[0100] The above takes the light guide plate 3 having the first light incident portion 31 and the second light incident portion 32 as an example for illustration, but it is not limited thereto. Please refer to Figure 3 and Figure 4, in some embodiments, the light guide plate 3 further includes a plurality of light incident portions and a plurality of light emitting elements, and a total of six light incident portions and six light emitting elements are used, so as to present more segments of continuous graphics. The numbers of the light incident portions and the light emitting elements can also be other integers. Figure 4 To illustrate the left and right positions of two light guide plates 3 on the light blocking plate 2 to display two rows of multi-segment continuous graphics, but not limited thereto. In some embodiments, a plurality of continuous graphics can be arranged in geometric shapes such as a circle, a square, or a star.

[0101] Please refer to Figure 3 , Figure 6 and Figure 7 , Figure 6 is a top view schematic diagram of the light emitting module having a light blocking structure. Figure 7 is Figure 6 a schematic cross-sectional view taken along the line B-B of . In some embodiments, the light emitting module of the touch panel further has a light blocking structure 315, and the light blocking structure 315 is disposed on one side surface of the second region 312. In Figure 6 the top view, the light blocking structure 315 is a long strip structure. One end of the long strip structure is connected to one side surface of the light guide portion 34, and the other end of the long strip structure is connected to the other side surface of the light guide portion 34. In some embodiments, the light blocking structure 315 is a long strip structure engraved in black at the central position of the light guide plate 3 by laser processing. The width of the black long strip structure is about between 0.5 mm and 0.8 mm. The thinner the width of the engraved black long strip structure, the less likely it is to be seen on the appearance of the product, and it does not affect the light emitting pattern P displayed on the appearance of the product. In some embodiments, the light blocking structure 315 and the light guide plate 3 are formed by double-shot injection molding.

[0102] Please refer to Figure 3 , Figure 6 and Figure 7 , from the cross-sectional view of the light guide plate 3, the light blocking structure 315 is located at the central position in the second axis Y direction of the light guide plate 3. The light guide plate 3 respectively includes hollow areas 36 above and below the light blocking structure 315 to prevent the light blocking structure 315 from affecting the flatness of the upper surface and the lower surface of the light guide plate 3 after laser processing. Thus, the light L emitted by the first light emitting element 11 is reduced by about 90% (or between 60% and 90%) due to the blocking of the light blocking structure 315. The reduced part of the light L propagates toward the periphery of the light guide portion 34. The light blocking structure 315 absorbs the remaining stray light and improves the afterimage problem, and about 10% of the light L continues to propagate toward the periphery of the light guide portion 34, but these lights L are not seen by the human eye on the appearance of the product and do not affect the aesthetics of the product appearance.

[0103] In some embodiments, the light-blocking structure 315 is provided on the light guide plate 3 as a light-blocking hole, a groove, or a cross-sectional structure. Thereby, the light L emitted by the first light-emitting element 11 is blocked by the light-blocking hole, the groove, or the cross-sectional structure, reducing the propagation of the light L toward the periphery of the light guide portion 34, so as to absorb residual stray light and improve the ghosting problem.

[0104] Please refer to Figure 3 , Figure 6 and Figure 7 , in some embodiments, the light-emitting module of the touchpad further has a light-blocking structure 325, and the light-blocking structure 325 is provided on the side surface of the second region 312 adjacent to the fourth region 324. The setting manner and the functional purpose of the light-blocking structure 325 are the same as those of the light-blocking structure 315, and will not be described herein again.

[0105] Please refer to Figure 3 , Figure 8 and Figure 9 , Figure 8 is a partial schematic view of the arc portion of the light-emitting module having a refraction structure, Figure 9 is Figure 8 an enlarged schematic view of the C circle marking of Figure 9 . In some embodiments, the light-emitting module of the touchpad has a refraction structure 35, and the refraction structure 35 can be a symmetric shape. Hereinafter, taking the example that the refraction structure 35 has two arc portions 351 formed on the light guide plate 3, the two arc portions 351 are respectively disposed between the second region 312 and the fourth region 324, the two arc portions 351 are located on a single side of the light guide portion 34 and are disposed between the first light-incident portion 31 and the second light-incident portion 32 arranged side by side, the two arc portions 351 face each other and protrude toward the center line C1 (such as Figure 9 shown by a one-dot chain line) between the second region 312 and the fourth region 324, and the two arc portions 351 are arranged along the third axis Z direction. When the first light-emitting element 11 or the second light-emitting element 12 emits the light L (such as Figure 9 shown by a two-dot chain line) and passes through the arc portion 351, the arc portion 351 deflects the light L, and the light L of the adjacent first light-emitting element 11 and the light L of the second light-emitting element 12 are respectively deflected into parallel light L at the two arc portions 351, avoiding the overflow of stray light at the intersection of the light L and affecting the light effect of the adjacent light-emitting pattern P.

[0106] Please refer to Figure 3 , Figure 10 and Figure 11 , Figure 10 is a partial schematic view of the light-emitting module, Figure 11 is Figure 10Enlarged schematic view marked by the D circle. In some embodiments, the light-emitting module of the touchpad has a refraction structure 35. Hereinafter, taking the opening 352 formed on the light guide plate 3 as an example for illustration, but not limited thereto. Among them, the opening 352 on the light guide plate 3 is disposed between the second region 312 and the fourth region 324, and is located on a single side of the light guide portion 34. The opening 352 is located on the center line C1 (such as Figure 11 shown by the one-dot chain line) between the first light-emitting element 11 and the second light-emitting element 12. The center line C1 is generally located at the intersection of the two light rays L. When the first light-emitting element 11 or the second light-emitting element 12 emits the light ray L (such as Figure 11 shown by the two-dot chain line) through the opening 352, the opening 352 deflects the light ray L, deflecting the light ray L of the adjacent first light-emitting element 11 and the light ray L of the second light-emitting element 12 into parallel light rays L, avoiding the overflow of stray light at the intersection of the light rays L and affecting the light effect of the adjacent light-emitting pattern P.

[0107] Please refer to Figure 3 、 Figure 10 and Figure 11 . In some embodiments, the opening 352 of the refraction structure 35 has a straight surface 3521 and a curved surface 3522. The two ends of the curved surface 3522 are connected to the two ends of the straight surface 3521. The straight surface 3521 is located on the center line C1 between the first light-emitting element 11 and the second light-emitting element 12 and is perpendicular to the center line C1. The straight surface 3521 is adjacent to a junction between the first light-incident portion 31 and the second light-incident portion 32 and maintains a predetermined distance. The curved surface 3522 protrudes in a direction away from the junction. When the first light-emitting element 11 or the second light-emitting element 12 emits the light ray L through the straight surface 3521, the straight surface 3521 deflects the light ray L to the curved surface 3522, and the curved surface 3522 then deflects the light ray L to be emitted in a direction perpendicular to the axis of the light guide portion 34 (the third axis Z direction). The light rays L of the adjacent first light-emitting element 11 and the second light-emitting element 12 are respectively deflected into parallel light rays L on the same straight surface 3521 and curved surface 3522, avoiding the overflow of stray light at the intersection of the light rays L and affecting the light effect of the adjacent light-emitting pattern P.

[0108] Please refer to Figure 3 and Figure 12 . Figure 12 is an enlarged schematic view of the light guide plate 3. In some embodiments, the first light-incident portion 31 of the light guide plate 3 includes a plurality of long strip-shaped grooves 37 arranged in sequence. Each groove 37 is formed by Figure 12It is recessed in the direction of the second axis Y, and the grooves 37 are located on the surface of the light guide plate 3. Each groove 37 is connected from the second side surface 31b to the third side surface 31c along the third axis Z direction. Each groove 37 is perpendicular to the light-emitting direction of the first light-emitting element 11. The light L is converged by each groove 37, and the light L of the first light-emitting element 11 is converged to the light guide portion 34 directly in front, which can avoid the loss of the light L and the influence on other independent light-emitting areas, so as to improve the problem of adjacent light interference. In some embodiments, each groove 37 of the light guide plate 3 is in a V shape, a U shape or an inverted ㄇ shape, and the number and arrangement density of each groove 37 are set as required.

[0109] Please refer to Figure 13 , which is a partial schematic diagram of the light guide plate 3. In some embodiments, the second side surface 31b or the third side surface 31c or both of the first light-incident portion 31 are non-planar surfaces. The second side surface 31b is provided with a plurality of microstructures 31b1 to present a non-planar surface, and the third side surface 31c is provided with a plurality of microstructures 31c1 to present a non-planar surface. Each microstructure 31b1 and each microstructure 31c1 are serrated or arc-shaped. Thereby, when the light L emitted by the first light-emitting element 11 is projected onto each microstructure 31b1 of the second side surface 31b or each microstructure 31c1 of the third side surface 31c, each microstructure 31b1 and each microstructure 31c1 reflect the light L to the light guide portion 34, so as to increase the amount of the light L entering the light guide plate 3 for total reflection transmission and increase the utilization rate of the light L.

[0110] Please refer to Figure 14 , which is a top view schematic diagram of the light-emitting module. In some embodiments, the first area 311 of the first light-incident portion 31 is in a rectangular shape, and the second area 312 is in a trapezoidal or gradually expanding geometric shape, but not limited thereto; in some embodiments, the overall shape of the first area 311 and the second area 312 of the first light-incident portion 31 is trapezoidal or gradually expanding geometric shape. Thereby, when the light L of the first light-emitting element 11 is emitted to the first area 311 and the second area 312, due to the shapes of the first area 311 and the second area 312, the projection angle of the light L of the first light-emitting element 11 is restricted, and the light L is prevented from propagating around the light-emitting pattern P, so that there are problems of adjacent light interference and afterimage for the adjacent light-emitting patterns P.

[0111] Please refer to Figure 15, which is a top view schematic diagram of the light-emitting module. In some embodiments, the first region 311 of the first light-incident portion 31 has a reduced region to form a narrow-gap channel 311a. The composition of the channel 311a is that the second side 31b has a recess, the third side 31c has a recess, and the recesses of the second side 31b and the third side 31c are opposite to each other and reduce the distance therebetween. Thus, when the light L of the first light-emitting element 11 is emitted to the first region 311 and the second region 312, due to the shapes of the first region 311 and the second region 312, the projection angle of the light L of the first light-emitting element 11 is restricted, preventing the light L from propagating toward the periphery of the light-emitting pattern P, and avoiding the problems of adjacent light interference and afterimage for adjacent light-emitting patterns P.

[0112] In summary, according to some embodiments, by restricting the projection angle of the light emitted by the light-emitting element through the first light-incident portion of the light guide plate, the light is incident on the light guide portion of the light guide plate to form independent light-emitting patterns without stray light around them. In addition, according to some embodiments, through each light-blocking structure of the light guide plate, the lights emitted by multiple light-emitting elements are turned at the intersections and do not overlap, achieving that no stray light overflows at the connection points of multiple light-emitting patterns, avoiding affecting the light effects of adjacent light-emitting patterns, and forming seamless connections of each light-emitting pattern, realizing a continuous and non-intermittent light-emitting pattern effect.

[0113] The above-described embodiments are only for illustrating the technical ideas and features of the present invention, and their purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. However, the patent scope of the present invention cannot be limited thereby. That is, all equivalent changes or modifications made in accordance with the spirit disclosed in the present invention should still be covered within the patent scope of the present invention.

Claims

1. A light emitting module for a touch panel, characterized in that: Include: A circuit board having a first light emitting element; a light shielding sheet, the light shielding sheet is disposed on the circuit board, the light shielding sheet has a hollow portion and a light shielding portion; and A light guide plate is accommodated in the hollow portion, the light guide plate has a first light entrance portion and a light guiding portion, the first light entrance portion includes a first side surface, a second side surface and a third side surface, the first side surface is adjacent to the first light-emitting element, the second side surface and the third side surface are respectively connected to the first side surface, wherein the extension of the second side surface and the third side surface forms an angle, the angle of the angle is smaller than the light-emitting angle of the first light-emitting element, and the light blocking portion is arranged adjacent to the second side surface or the third side surface.

2. The light emitting module of the touch panel according to claim 1, characterized in that: The invention also comprises a light reflecting layer or a light absorbing layer arranged between the circuit board and the light blocking sheet.

3. The light emitting module of the touch panel according to claim 1, characterized in that: The first light incident portion includes a first area and a second area, the first area is adjacent to the first light-emitting element, and the second area is connected to the light-guiding portion, wherein the first area is a trapezoidal or gradually expanding geometric shape, and a first length of the second area bordering the first area is greater than a second length of the first side surface.

4. The light emitting module of the touch panel according to claim 3, characterized in that: A light blocking structure is also provided, and the light blocking structure is arranged on a side surface of the second area.

5. The light emitting module of the touch panel as claimed in claim 3, characterized in that: The light guide plate also includes a second light-emitting element and a second light-entering portion. The second light-entering portion includes a third area and a fourth area. The third area is adjacent to the second light-emitting element. The fourth area is connected to the light guide portion. The light blocking portion is arranged between the first area and the third area.

6. The light emitting module of the touch panel according to claim 5, characterized in that: A light blocking structure is disposed on a side of the second region adjacent to the fourth region.

7. The light emitting module of the touch panel according to claim 5, characterized in that: The light guide plate further includes an opening, and the opening is arranged between the second area and the fourth area.

8. The light emitting module of the touch panel according to claim 1, characterized in that: It also includes a cover plate, which is arranged on the light blocking sheet and the light guiding sheet. The surface of the cover plate facing the light blocking sheet is provided with a reflective area and a light-transmitting area. The light-transmitting area is arranged corresponding to the light guiding part, and the first light incident part is arranged corresponding to the reflective area.

9. The light emitting module of the touch panel according to claim 8, characterized in that: The area of ​​the light-transmitting region is smaller than the area of ​​the light-guiding portion.

10. The light emitting module of the touch panel according to claim 1, characterized in that: The second side surface or the third side surface is a non-planar surface.

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