TWI475724B - Light emitting unit, manufacturing method thereof and touch panel having the same - Google Patents

Description

Light emitting unit, manufacturing method thereof and touch panel

The present invention relates to a light emitting unit, a manufacturing method thereof, and a touch panel, and more particularly to a light emitting unit having an asymmetric light emitting state, a manufacturing method thereof, and a touch panel.

With the development of electronic products, many types of input devices are currently available for operation within electronic systems, such as buttons or buttons, mice, trackballs, touch screens, and the like. Recently, touch screen applications have become more and more popular. The touch screen may include a touch panel, which may be a transparent panel with a touch-sensitive surface so that the work surface covers the viewable area of the display screen. The touch screen allows the user to select and move the cursor by touching the display screen with a finger or a stylus, and to achieve an operation according to the touch event. Infrared light proximity sensors are widely used in handheld communication devices to form an infrared touch panel for detecting the user's face and display screen. The distance between them to achieve operational control.

The main principle of the infrared touch panel is that the four sides of the front of the screen are covered with light-emitting diodes (LEDs) that can emit/receive infrared beams, and the light-emitting diodes arranged around them simultaneously generate infrared signals to form a neatly interlaced infrared light. The net, when the operator's finger approaches the screen, blocks the infrared rays for positioning purposes. At present, the light-emitting diodes in the general surface adhesion (SMT) form usually have symmetrical illumination states in two directions of illumination. For example, the viewing angles of the LEDs on the X-axis and the Y-axis are usually quite close, however, The illuminating diode having a symmetrical illuminating state is not suitable for the application of the touch panel, because the touch panel only needs to detect an object in a single direction, for example, the operator's finger only approaches the display from the front of the display; The illuminating diode of the symmetrical light-emitting state forms the same light in two directions, which may cause a crosstalk problem, and the problem that the sensing distance of the touch panel cannot be improved. When the sensing distance of the touch panel is too small, the operator's finger must be relatively close to the display to perform positioning, so there is a problem that the sensitivity is lowered, and the operator's finger is scratched to cause the display to have a reduced life.

In addition, when the illuminating diode having the symmetrical illuminating state has a large angle of view in a certain direction, the other direction also has a large angle of viewing angle, which also causes the overall illuminating brightness to be lower than that required for the application. Brightness.

One of the objects of the present invention is to provide a method for manufacturing a light-emitting unit, which utilizes a molding and cutting step to form a package structure having a specific appearance, so that the package structure can control the light of the light-emitting element to have an asymmetry in different light-emitting directions. In order to meet the specific needs of touch panels, touch screens, and the like.

The embodiment of the invention provides a method for manufacturing a light emitting unit, comprising the steps of: providing a substrate, the substrate comprising a plurality of circuit regions, and respectively arranging a light emitting component on each of the circuit regions; forming a package structure Corresponding to each of the circuit regions, the package structure covers the light-emitting elements; and cutting along two axial scribe lines to form a plurality of single light-emitting units, wherein the package structure is respectively separated in the two axial directions After two cuttings, the package structure has a top surface and two corresponding sets of sides, the top surface being a double-curved surface to form a biconic lens package structure; wherein each of the light-emitting units There are asymmetric illumination patterns in both directions of illumination.

An embodiment of the present invention provides a light emitting unit, comprising: a substrate having a circuit region thereon; a light emitting device disposed on the substrate and electrically connected to the circuit region; and a double tapered lens package structure, The package structure has a top surface and two corresponding sets of sides, the top surface being a double-curved surface; wherein the light-emitting unit has an asymmetric light-emitting state in two light-emitting directions.

A touch panel includes at least a plurality of light emitting units and a plurality of receivers corresponding to the light emitting units, each of the light emitting units including: a substrate having a circuit region thereon; and a light emitting component a double-conical lens package structure having a top surface and two corresponding sets of side surfaces, wherein the top surface is a double-sided surface; The illumination unit has an asymmetrical illumination pattern in both illumination directions.

The invention has the following beneficial effects: the manufacturing method of the invention has a simple process, and the package structure having a specific appearance can be formed by the cutting method; and the package structure formed by the invention has asymmetric optical characteristics, so that the light is illuminated in two Different illuminating patterns are formed in the direction, and the asymmetric illuminating light can be applied to the field of the touch panel, and the sensing (sensing) distance of the touch panel is effectively improved, and the illuminating intensity (intensity) can be satisfied for general use. Demand.

For a better understanding of the features and technical aspects of the present invention, reference should be made to the accompanying drawings.

Referring to FIG. 1 and FIG. 1A , and in conjunction with FIG. 2 and FIG. 3 , the present invention provides a method for manufacturing a light emitting unit, which indirectly uses a cutting method to produce a biconical shape that is not easily molded by molding or the like. The package structure 13, in other words, the present invention first plans an appropriate biconical lens package structure 13 with an optical simulation software, but since this structure is not or difficult to directly form, the present invention proposes the following for such a structure. The manufacturing method of the biconical lens package 13 can be applied to the application of the illumination unit 1, the touch panel and the like of the present invention, so that the side-view illumination unit 1 of the present invention has different illumination directions. Different illuminating aspects. The manufacturing method of the present invention includes at least the following steps:

Step (1): A substrate 11 is provided. The substrate 11 includes a plurality of circuit regions (not shown), and the light-emitting elements 12 are respectively disposed on each of the circuit regions. As shown in FIG. 1 and FIG. 2, in the specific embodiment, the substrate 11 includes 3 by 2 arrays, and after the process described later, six single light-emitting units 1 can be fabricated (see FIG. 3). This is shown for illustrative purposes only and is not intended to limit the invention. In the present embodiment, the light-emitting elements 12 are respectively mounted on each of the circuit regions, such as a method of solid crystal bonding, wire bonding, and the like. In the embodiment, the light-emitting element 12 is a light-emitting diode (LED), and the light-emitting element 12 can be fixed on each circuit area by die attaching, and the light is emitted by using a wire bonding method. The component 12 is electrically connected to the circuitry of the circuit region to which it corresponds.

Step (2): Forming a package structure 13' corresponding to each of the circuit regions, the package structure 13' coating the light-emitting element 12. Referring to FIG. 1 , in the specific embodiment, a molding step is performed by using a mold (not shown) to cure the encapsulating material to cover and cover the circuit region and the light-emitting element 12 . The encapsulating material used in the molding step may be a thermoplastic, such as a main component, which may be polyparaphenylene terephthalamide (PPA), polyamine (PA), or the like; or a thermosetting plastic, such as A clear adhesive containing at least a silicone or resin material. Furthermore, in the present embodiment, the package structure 13' can form a dome-like lenticular package structure 13' (as shown in FIG. 1A) corresponding to the light-emitting element 12, so as to facilitate the light-emitting element 12 Light is shining. In the present embodiment, the light-emitting element 12 is a light-emitting diode that emits infrared light, and the package structure 13' is made of an encapsulating material that allows infrared light to penetrate. The top mask of the convex package structure 13' has a first top surface area 131 and a second top surface area 132. The first top surface area 131 is a bimorphal surface, and the second top surface area 132 is not limited thereto. The aspect (because the second top surface region 132 is removed in a subsequent step, the aspect is not a part of the invention), and the double-surface can be broadly referred to as any n-dimensional hypersurface. It is defined as the trajectory of the solution of a multivariate quadratic equation, such as an ellipsoid, a spherical surface, a spherical surface, an elliptical paraboloid, a hyperbolic paraboloid, and the like.

Step (3): cutting along two axial cutting channels to form a plurality of single light emitting units 1, and further cutting the package structure 13' twice in the two axial directions to make the package after cutting The structure 13' has a top surface 131 and two sets of corresponding side surfaces 132A, 132B to form a biconical lens package structure 13. It is worth noting that the top surface 131 formed after the cutting step is The first top surface area 131 of the convex package structure 13' is used, so the same reference numerals are used for both, and since the top surface 131 after the dicing is the first top surface area 131 of the package structure 13', the top surface 131 is the aspect of the bisurface. As shown in FIG. 2, after the encapsulating material in the step (2) is cured and molded into the encapsulating structure 13', the mold is removed from the substrate 11 to perform a cutting step, in which a cutting tool such as a cutter is used. Cut along the defined scribe line.

It should be noted that, in addition to cutting the foregoing light-emitting array into a plurality of single light-emitting units 1, the cutting step can further select the shape and size of the package structure 13' according to the requirements of the light-emitting. For example, the designer can first calculate the cutting width of the package structure in the two axial directions by using the simulation software, which is illustrated in FIG. 2, and each package structure 13' of the light-emitting array is in the longitudinal direction (in the direction shown) After two cuts, for example, by SX1, SX2 or SX3, SX4 two cutting lines, the required shape and size of the package structure 13' in the longitudinal direction are cut; and in the lateral direction (subject to the direction shown) After two cuts, for example, by SY1, SY2 or SY3, SY4 or SY5, SY6 and the like, the desired shape and size of the package structure 13' in the lateral direction are cut out. In addition, after two cuts in two axial directions, the second top surface region 132 of the package structure 13' can be removed by cutting to form the biconical lens package structure 13, and the biconical lens package structure 13 has one A bottom surface 133 connected to the substrate 11 is a rectangular shape such as a rectangle.

Please refer to FIG. 3 , which is a single light-emitting unit 1 completed after the above steps, wherein the connection between the side surface 132A ( 132B ) and the lenticular top surface 131 forms a conic curve or the like, so the present invention will package Structure 13 is referred to as a double cone and top surface 131 is a biquad surface. In addition, the light emitted by the light-emitting element 12 can be emitted in an asymmetric manner by the top surface 131 of the double-order curved surface to achieve a smaller viewing angle in the first light-emitting direction and a second light-emitting direction in the second light-emitting direction. Large viewing angle. After the calculation of the optical simulation software of the present invention, when the ratio of the viewing angle of the illumination unit 1 in the two illumination directions is greater than 1.5, the detection distance and brightness of the infrared touch panel can be satisfied. In addition, the first light emitting direction and the second light emitting direction may be perpendicular to each other (such as X and Y axes), but the two may not be perpendicular to each other, depending on the requirements of the application surface.

Please refer to FIG. 4 and FIG. 5, which illustrate a preferred embodiment of the present invention. FIG. 4 is a view showing a viewing angle of the light-emitting unit of FIG. 3 in the X-axis (second light-emitting direction), wherein the X-axis is The viewing angle is less than 40 degrees; and FIG. 5 is a view showing the viewing angle of the light-emitting unit 1 of FIG. 3 in the Y-axis (second light-emitting direction), wherein the viewing angle on the Y-axis is greater than 80 degrees; therefore, the viewing angle of the Y-axis is The ratio of the viewing angle of the X axis is greater than 2.

Referring to FIG. 6 , a touch panel TP includes at least a plurality of the light emitting unit 1 of the present invention and a plurality of receivers 2 corresponding to the light emitting unit 1 . The light emitting unit 1 and the receiver 2 are arranged in contact with each other. Around the control panel TP, when the trigger signal S (such as the operator's finger) approaches, the effect of blocking the infrared rays is generated, and the positioning can be performed. Specifically, the light-emitting units 1 are independent and single, and the purpose of positioning can be achieved by analyzing the position of the cut-off. Finally, the signal is transmitted to the processing terminal of the computer host through the operation of the control circuit, and then through the display. Display the position of the signal that was just touched, or perform other signal manipulation operations via other software.

In summary, the present invention has at least the following advantages:

1. The present invention utilizes a processing method such as cutting to cut a convex lenticular package structure into a biconical package structure, so that the illuminating unit produces an asymmetrical illuminating state in two illuminating directions, and this asymmetry The illuminating aspect can make the touch panel have a larger sensing distance and a lower crosstalk problem when applied to the touch panel.

2. Since the illumination unit of the present invention has a large viewing angle (e.g., greater than 80 degrees) in a particular illumination direction and a small viewing angle (e.g., less than 40 degrees) in another relative illumination direction, The overall luminous intensity can still meet the general application needs.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and the equivalents of the present invention are intended to be included within the scope of the present invention.

1. . . Light unit

11. . . Substrate

12. . . Light-emitting element

13, 13'. . . Package structure

131. . . Top surface (first top surface area)

132. . . Second top area

132A. . . side

132B. . . side

133. . . Bottom

2. . . receiver

TP. . . Touch panel

SX1, SX2, SX3, SX4. . . cutting line

SY1, SY2, SY3, SY4, SY5, SY6. . . cutting line

Figure 1 is a side view showing a light-emitting array of the present invention.

Fig. 1A is a schematic view showing a convex lenticular package structure of the present invention.

Figure 2 is a schematic illustration of a dicing street on a luminescent array of the present invention.

Figure 3 is a schematic view showing a single light emitting unit of the present invention.

Fig. 4 is a view showing the light pattern of the light-emitting unit of the present invention on the X-axis.

Fig. 5 is a view showing a light pattern of the light-emitting unit of the present invention on the Y-axis.

6 is a schematic view showing a touch panel of the present invention.

1. . . Light unit

11. . . Substrate

12. . . Light-emitting element

13. . . Package structure

131. . . Top surface

132A. . . side

132B. . . side

133. . . Bottom

Claims (9)

A manufacturing method of a light emitting unit, comprising the steps of: providing a substrate, the substrate comprising a plurality of circuit regions, and respectively arranging a light emitting component on each of the circuit regions; forming a package structure corresponding to each of the circuits a region, the package structure encasing the light emitting element; and cutting along two axial scribe lines to form a plurality of single light emitting units, wherein the package structure is cut twice in the two axial directions respectively The package structure has a top surface and two corresponding sets of sides, the top surface being a double-curved surface to form a biconic lens package structure; wherein each of the light-emitting units is in two light-emitting directions It has an asymmetric illuminating aspect. The method for manufacturing a light-emitting unit according to claim 1, wherein in the step of molding a package structure, the light-emitting element is covered by a die-like dome-like package structure, the protrusion The top mask of the package structure has a first top surface area and a second top surface area, the first top surface area being the double-sided surface; cutting along two axial cutting lanes In the step, the second top surface area is removed by cutting, and the first top surface area left is the top surface of the biconical lens package structure. The method of manufacturing a light-emitting unit according to claim 2, wherein before the step of cutting along the two axial scribe lines, the method further comprises: calculating the convex package structure in the two axial directions by using a simulation software Cutting width. The method for manufacturing a light-emitting unit according to claim 1, wherein a ratio of a viewing angle of each of the light-emitting units in two light-emitting directions is greater than 1.5. The method for manufacturing a light-emitting unit according to claim 1, wherein a viewing angle of each of the light-emitting units in a first light-emitting direction is less than 40 degrees, and the light-emitting unit is visible in a second light-emitting direction. The angle is greater than 80 degrees. A light-emitting unit includes: a substrate having a circuit region thereon; a light-emitting element coupled to the substrate and electrically connected to the circuit region; and a double-cone lens package structure, the double-cone lens package The structure has a top surface and two corresponding sets of sides, the top surface is a double-sided curved surface, and the double-cone lens package structure is a die-like package structure for cutting the shape; The light-emitting unit has an asymmetrical illumination pattern in two illumination directions. The illuminating unit of claim 6, wherein the package structure has a bottom surface connected to the substrate, the bottom surface being rectangular. The illuminating unit of claim 6, wherein the viewing angle of the illuminating unit in a first illuminating direction is less than 40 degrees, and the viewing angle of the illuminating unit in a second illuminating direction is greater than 80 degrees. . A touch panel comprising at least a plurality of light emitting units and a plurality of light emitting units a light unit corresponding to the receiver, each of the light emitting units includes: a substrate having a circuit region thereon; a light emitting device disposed on the substrate and electrically connected to the circuit region; and a double cone lens package The biconical lens package structure has a top surface and two corresponding sets of sides, the top surface is a double-sided surface, and the biconical lens package structure is a dome-like The package structure cuts the shaper; wherein the light-emitting unit has an asymmetrical illumination pattern in two illumination directions.