Light-emitting element packaging structure

Abstract

The invention discloses a light-emitting element packaging structure which comprises a cup body, a light-emitting element, a packaging body and a lens. The cup body comprises a bottom plate and a side wall. The light-emitting element is arranged on the bottom plate and surrounded by the side wall. The packaging body is filled in the cup body, wraps the light-emitting element and is provided with an arc surface higher than the side wall. The lens is arranged on the cup body, is provided with a light incident side and a light emergent side which are opposite, and comprises an inner cambered surface, a roof type optical element and an outer cambered surface; the inner arc surface is located on the light incident side and makes contact with and is attached to the arc surface. The roof-type optical element corresponds to the light-emitting element and comprises a concave part and a reflecting material filled in the concave part, and the concave part is provided with a cambered surface which is concave from the light-emitting side to the light-incident side. The outer cambered surface is located on the light emitting side and surrounds the roof type optical element, the curvature of the cambered surface is larger than that of the inner cambered surface, and the curvature of the inner cambered surface is larger than that of the outer cambered surface.

Description

Technical Field

[0001] The present invention relates to a light emitting element packaging structure, and in particular to a light emitting element packaging structure including a lens. Background Art

[0002] Head-Up Display (HUD) is a display technology applied to vehicles. It is used to present driving information to the driver's field of view by means of light projection or reflection, such as through the windshield in front of the driver, so that the driver can keep his eyes on the road ahead and directly check the vehicle's driving information without shifting his eyes, such as vehicle speed, engine speed, navigation instructions, lane departure warnings, traffic signs, blind spot detection and forward collision warnings, etc., in order to reduce distraction caused by looking down at the dashboard or navigation system, thereby improving driving safety and convenience.

[0003] Currently, light emitting diodes are one of the light sources for head-up displays. Therefore, how to improve the light pattern, efficiency and reliability of light emitting diodes to achieve a striking guidance effect and be suitable for a vehicle vibration environment is one of the research goals in this technical field. Summary of the invention

[0004] The invention provides a light emitting element packaging structure, which can improve light type, efficiency and reliability.

[0005] The light-emitting element packaging structure proposed in at least one embodiment of the present invention comprises a cup body, a light-emitting element, a packaging body and a lens. The cup body comprises a bottom plate and a side wall. The light-emitting element is arranged on the bottom plate and surrounded by the side wall. The packaging body is filled in the cup body and covers the light-emitting element, and has a circular arc surface higher than the side wall. The lens is arranged on the cup body and has a light-incoming side facing the light-emitting element and a light-emitting side facing away from the light-emitting element, and comprises an inner arc surface, a roof-type optical element and an outer arc surface. The inner arc surface is located on the light-incoming side, and contacts and fits with the circular arc surface. The roof-type optical element corresponds to the light-emitting element, and comprises a recessed portion and a reflective material filled in the recessed portion, and the recessed portion has a curved surface that is recessed from the light-emitting side to the light-incoming side. The outer arc surface is located on the light-emitting side and surrounds the roof-type optical element, the curvature of the arc surface is greater than the curvature of the inner arc surface, and the curvature of the inner arc surface is greater than the curvature of the outer arc surface.

[0006] In at least one embodiment of the present invention, the reflectivity of the reflective material is 65% to 95%.

[0007] In at least one embodiment of the present invention, the reflective material is a mixture of titanium dioxide and silica gel, white ink or white paint.

[0008] In at least one embodiment of the present invention, the transmittance of the reflective material is no greater than 30%.

[0009] In at least one embodiment of the present invention, the side wall has an inner wall surface adjacent to the light emitting element and an outer wall surface away from the light emitting element, and the lens further has an edge located between the light incident side and the light emitting side, the edge being flush with the outer wall surface.

[0010] In at least one embodiment of the present invention, the inner wall surface and the bottom plate form an obtuse angle.

[0011] In at least one embodiment of the present invention, a range formed by an orthogonal projection of the light emitting element on the bottom plate is located within a range formed by an orthogonal projection of the recessed portion on the bottom plate.

[0012] In at least one embodiment of the present invention, the bottom plate has a surface facing the lens, and within a range formed by the orthographic projection of the inner arc surface onto the bottom plate, the surface is a flat surface.

[0013] In at least one embodiment of the present invention, the light emitting element is a horizontal light emitting diode and is disposed on the base plate in a flip chip manner.

[0014] In at least one embodiment of the present invention, the packaging body is a mixture of wavelength conversion material and silica gel. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a cross-sectional schematic diagram of a light emitting element packaging structure according to at least one embodiment of the present invention.

[0016] Figure 2 It is a schematic top view of a light emitting element packaging structure according to at least one embodiment of the present invention.

[0017] FIG. 3A to FIG. 3C It is a cross-sectional schematic diagram of a cup body and a light-emitting element according to at least one embodiment of the present invention.

[0018] Figure 4 yes Figure 1 Light distribution diagram of the light-emitting element packaging structure.

[0019] Figure 5 is a schematic top view of a light emitting device according to at least one embodiment of the present invention.

[0020] Figure 6 yes Figure 5 Light distribution diagram of a light-emitting device.

[0021] Wherein, the reference numerals are:

[0022] 10: Light-emitting device

[0023] 10F, 100F: Light type

[0024] 11:Substrate

[0025] 100: Light-emitting element packaging structure

[0026] 110: cup body

[0027] 110B: Bottom plate

[0028] 110S: Sidewall

[0029] 120, 121, 122: Light emitting element

[0030] 130: Encapsulation

[0031] 140: Lens

[0032] 140R: Roof-mounted optics

[0033] CP: Concave part

[0034] CS: Arc Surface

[0035] E: Edge

[0036] EL: light emitting side

[0037] IL: Light incident side

[0038] IW: inner wall

[0039] OW: outer wall

[0040] PD: connection pad

[0041] RM:Reflective material

[0042] S1: Inner curved surface

[0043] S2: Outer curved surface

[0044] S3: curved surface

[0045] US: Surface

[0046] W:Connecting wire

[0047] θ: Obtuse angle DETAILED DESCRIPTION

[0048] In the following text, in order to clearly present the technical features of the present invention, the dimensions (e.g., length, width, thickness, and depth) of the elements (e.g., layers, films, substrates, and regions, etc.) in the drawings will be enlarged in unequal proportions, and the number of some elements will be reduced. Therefore, the description and explanation of the embodiments below are not limited to the number of elements in the drawings and the dimensions and shapes presented by the elements, but should cover the dimensions, shapes, and deviations thereof caused by the actual process and / or tolerances. For example, the flat surface shown in the drawings may have rough and / or nonlinear features, and the acute angles shown in the drawings may be rounded. Therefore, the elements presented in the drawings of the present invention are mainly for illustration, and are not intended to accurately depict the actual shape of the elements, nor are they intended to limit the scope of the patent application of the present invention.

[0049] Secondly, the words "about", "approximately" or "substantially" used in the present invention not only cover the numerical values ​​and numerical ranges clearly recorded, but also cover the permissible deviation range that can be understood by a person with ordinary knowledge in the technical field to which the invention belongs, wherein the deviation range can be determined by the error generated during measurement, and the error is caused by the limitation of the measurement system or process conditions, for example. For example, two objects (such as the planes or traces of the substrate) are "substantially parallel" or "substantially perpendicular", wherein "substantially parallel" and "substantially perpendicular" respectively represent that the parallelism and perpendicularity between the two objects may include the non-parallelism and non-perpendicularity caused by the permissible deviation range.

[0050] In addition, "approximately" may mean within one or more standard deviations of the above values, such as ±30%, ±20%, ±10% or ±5%. The words "approximately", "approximately" or "substantially" used in the present invention may be selected based on the optical properties, etching properties, mechanical properties or other properties to select an acceptable deviation range or standard deviation, rather than applying a single standard deviation to all properties such as the above optical properties, etching properties, mechanical properties and other properties.

[0051] The spatially relative terms used in the present invention, such as "below", "under", "above", "on", etc., are for the purpose of facilitating the description of the relative relationship between one element or feature and another element or feature, as shown in the figure. The true meaning of these spatially relative terms includes other orientations. For example, when the figure is flipped up and down 180 degrees, the relationship between one element and another element may change from "below" or "under" to "above" or "on". In addition, the spatially relative descriptions used in the present invention should also be interpreted in the same way.

[0052] It should be understood that, although the present invention may use the terms "first", "second", "third" and the like to describe various elements or signals, these elements or signals should not be limited by these terms. These terms are mainly used to distinguish one element from another element, or one signal from another signal. In addition, the term "or" used in the present invention may include any one or more combinations of the associated listed items depending on the actual situation.

[0053] In addition, the present invention may be implemented or applied through other different specific embodiments, and the details of the present invention may also be combined, modified and changed in various embodiments based on different viewpoints and applications without departing from the concept of the present invention.

[0054] Figure 1 is a cross-sectional view of a light emitting device package structure 100 according to at least one embodiment of the present invention. Figure 1 The light emitting element package structure 100 includes a cup body 110, a light emitting element 120, a package body 130 and a lens 140. The cup body 110 includes a bottom plate 110B and a side wall 110S. The light emitting element 120 is disposed on the bottom plate 110B and surrounded by the side wall 110S. The package body 130 is filled in the cup body 110 and covers the light emitting element 120, and has an arc surface CS higher than the side wall 110S.

[0055] The lens 140 is disposed on the cup body 110 and has a light incident side IL facing the light emitting element 120 and a light emitting side EL facing away from the light emitting element 120, and includes an inner arc surface S1, a roof-type optical element 140R and an outer arc surface S2. The inner arc surface S1 is located on the light incident side IL and is in contact with and fits with the arc surface CS. The roof-type optical element 140R corresponds to the light emitting element 120 and includes a recessed portion CP and a reflective material RM filled in the recessed portion CP. The recessed portion CP has an arc surface S3 that is recessed from the light emitting side EL to the light incident side IL. The outer arc surface S2 is located on the light emitting side EL and surrounds the roof-type optical element 140R. The curvature of the arc surface S3 is greater than the curvature of the inner arc surface S1, and the curvature of the inner arc surface S1 is greater than the curvature of the outer arc surface S2.

[0056] Since the lens 140 includes an inner curved surface S1 and an outer curved surface S2, and the curvature of the inner curved surface S1 is greater than the curvature of the outer curved surface S2, the large-angle light emitted by the light-emitting element 120 can be gathered within a range of approximately positive 45 degrees to approximately negative 45 degrees to improve the light output efficiency, and then part of the light is reflected by the roof-type optical element 140R having a curved surface S3 with a curvature greater than the curvature of the inner curved surface S1 to avoid excessive light being emitted from the center and causing excessive brightness, thereby improving the light type of the light-emitting element packaging structure 100. In addition, by contacting and laminating the inner arc surface S1 of the lens 140 with the arc surface CS of the package body 130, it is possible to avoid refraction or reflection caused by other media (such as air) between the package body 130 and the lens 140, which prevents the light from being smoothly emitted and affects the light extraction efficiency. Compared with the design in which the contact surface between the lens and the package body is a flat surface, the inner arc surface S1 of the lens 140 and the arc surface CS of the package body 130 are in contact and laminating, which can increase the adhesion area and stability between the lens 140 and the package body 130, thereby improving reliability. Therefore, the above-mentioned light-emitting element packaging structure 100 can be applied to the head-up display of the vehicle to achieve a striking guidance effect and is suitable for the environment of vehicle vibration.

[0057] like Figure 1 As shown, the side wall 110S of the cup body 110 has an inner wall surface IW adjacent to the light emitting element 120 and an outer wall surface OW away from the light emitting element 120, the inner wall surface IW and the bottom plate 110B of the cup body 110 form an obtuse angle θ, and the lens 140 further has an edge E located between the light incident side IL and the light emitting side EL, the edge E is aligned with the outer wall surface OW, that is, the length and width of the cup body 110 are substantially the same as the length and width of the lens 140. In addition, within the range formed by the positive projection of the inner arc surface S1 of the lens 140 on the bottom plate 110B of the cup body 110, the surface US of the bottom plate 110B facing the lens 140 is a flat surface, that is, the surface US of the bottom plate 110B is the same plane within the positive projection range of the inner arc surface S1 on the bottom plate 110B. Through the above design, the large-angle light emitted by the light emitting element 120 can be gathered in the range of about positive 45 degrees to about negative 45 degrees to improve the light extraction efficiency.

[0058] Figure 2 FIG. 1 is a schematic top view of a light emitting device package structure 100 according to at least one embodiment of the present invention. Figure 2 , the range formed by the positive projection of the light emitting element 120 on the bottom plate 110B of the cup body 110 is located within the range formed by the positive projection of the recessed portion CP of the lens 140 on the bottom plate 110B of the cup body 110. Since the reflective material RM filled in the recessed portion CP can reflect part of the light, the above-mentioned design can effectively avoid the situation where too much light is emitted from the center to cause excessive brightness, thereby improving the light type of the light emitting element package structure 100.

[0059] It is worth noting that the reflective material RM is in a form that fills the recessed portion CP, that is, the middle thickness of the reflective material RM is greater than the edge thickness. In addition, the reflectivity of the reflective material RM can be 65% to 99%, and the material of the reflective material RM can be a mixture of titanium dioxide and silicone, white ink, white paint or silver. In some embodiments, the reflectivity of the reflective material RM is 65% to 95%, the transmittance of the reflective material RM is not greater than 30%, and the material of the reflective material RM is a mixture of titanium dioxide and silicone, white ink or white paint. Through the aforementioned reflectivity, transmittance and material selection, in addition to avoiding the situation where too much light is emitted from the center and causing it to be too bright, thereby improving the light type of the light-emitting element packaging structure 100, it can also avoid the situation where materials with too high reflectivity and too low transmittance cannot cause light to be emitted from the center and become too dark.

[0060] The material of the package body 130 may be a mixture of wavelength conversion material and silica gel, or a mixture of scattering particles and silica gel. The wavelength conversion material may be, for example, phosphor or quantum dots (QD), such as silicate, silicon nitride, sulfide, quantum dots, garnet or other suitable materials or a combination of the above materials, so that the light emitted by the light emitting element 120 is converted into light of a desired color.

[0061] The light emitting element 120 may be a light emitting diode (LED), such as a sub-millimeter light emitting diode (mini LED) or a micro LED (micro LED, μLED). The thickness of a micro LED is less than 30 microns, and the thickness of a sub-millimeter LED may be less than 300 microns. In addition, the light emitting element 120 may also be a large-sized regular LED other than a sub-millimeter LED and a micro LED, so the light emitting element 120 is not limited to a smaller sub-millimeter LED or a micro LED.

[0062] FIG. 3A to FIG. 3C is a cross-sectional schematic diagram of a cup body 110 and a light emitting element 120 according to at least one embodiment of the present invention. Figure 3A , the light emitting element 120 is a horizontal light emitting diode, and is disposed on the bottom plate 110B of the cup body 110 in a flip chip manner. In detail, the pads (not shown) of the light emitting element 120 are located on the same side of the light emitting element 120 and face the bottom plate 110B, and are electrically connected to the connection pads PD of the bottom plate 110B through welding. With the above-mentioned design, the heat generated by the light emitting element 120 can be directly conducted to the bottom plate 110B through the pads, and dissipated through the bottom plate 110B, so the reliability can be improved. The light emitting element package structure 100 applied to the head-up display of the vehicle can be suitable for the vehicle in the sun or high temperature environment.

[0063] See also Figure 3B The light emitting element 121 is a horizontal light emitting diode and is disposed on the bottom plate 110B of the cup body 110 by wire bonding. Specifically, the pads (not shown) of the light emitting element 121 are located on the same side of the light emitting element 121 and facing away from the bottom plate 110B, and are electrically connected to the connection pads PD of the bottom plate 110B via the connection wires W.

[0064] See also Figure 3C The light emitting element 122 is a vertical light emitting diode, and is disposed on the bottom plate 110B of the cup body 110 by welding and wire bonding. Specifically, the pads (not shown) of the light emitting element 122 are respectively located on the side of the light emitting element 122 facing the bottom plate 110B and the side facing away from the bottom plate 110B, and are respectively electrically connected to the connection pad PD of the bottom plate 110B by welding and electrically connected to the connection pad PD of the bottom plate 110B by a connection wire W.

[0065] Figure 4 is a light distribution diagram of a light emitting device package structure 100 according to at least one embodiment of the present invention. Figure 1 and Figure 4 Since the lens 140 includes an inner curved surface S1 and an outer curved surface S2, and the curvature of the inner curved surface S1 is greater than the curvature of the outer curved surface S2, the large-angle light emitted by the light-emitting element 120 can be gathered in the range of about positive 45 degrees to about negative 45 degrees to improve the light extraction efficiency, and then part of the light is reflected by the roof-type optical element 140R having a curved surface S3 with a curvature greater than that of the inner curved surface S1 to avoid excessive light being emitted from the center and causing excessive brightness, so as to obtain the following Figure 4 The light type 100F focuses on emitting light in the range of about positive 45 degrees to about negative 45 degrees, and the brightness in the aforementioned angle range is roughly the same.

[0066] Figure 5 yes Figure 1 A schematic top view of a light emitting device 10 is shown. Figure 5 The light emitting device 10 includes a substrate 11 and a light emitting element packaging structure 100 disposed on the substrate 11. The light emitting device 10 can be applied to a head-up display of a vehicle. It should be understood that although Figure 5 Four light emitting device package structures 100 are shown, but the present invention is not limited thereto. In other embodiments, the number of light emitting device package structures may be increased or decreased according to needs.

[0067] Figure 6 yes Figure 5 The light distribution diagram of the light emitting device 10. Figure 6, the light pattern 10F of the light emitting device 10 is concentrated in the range of about positive 40 degrees to about negative 40 degrees, and the brightness in the aforementioned angle range is approximately the same. Therefore, the light emitting device 10 has good efficiency and appropriate light pattern, and its application in the head-up display of the vehicle can achieve a striking guidance effect.

[0068] In summary, in the light-emitting element packaging structure of at least one embodiment of the present invention, since its lens includes an inner arc surface and an outer arc surface, and the curvature of the inner arc surface is greater than the curvature of the outer arc surface, the large-angle light emitted by the light-emitting element can be gathered in the range of about positive 45 degrees to about negative 45 degrees to improve the light extraction efficiency, and then part of the light is reflected by the roof-type optical element having a curved surface with a curvature greater than the curvature of the inner arc surface to avoid too much light being emitted from the center to cause excessive brightness, thereby improving the light type. In addition, by contacting and fitting the inner arc surface of the lens with the arc surface of the packaging body, it is possible to avoid refraction or reflection caused by other media between the packaging body and the lens, which prevents the light from being smoothly emitted and affects the light extraction efficiency, and the adhesion area and stability between the lens and the packaging body can be increased, thereby improving reliability. Therefore, the above-mentioned light-emitting element packaging structure applied to the head-up display of the vehicle can achieve a striking guidance effect and is suitable for an environment where the vehicle vibrates.

[0069] Although the present invention has been disclosed as above by way of embodiments, it is not intended to limit the present invention. A person having ordinary knowledge in the technical field to which the present invention belongs may make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the scope of the attached patent application.

Claims

1. A light emitting element packaging structure, characterized in that: include: A cup body, comprising a bottom plate and a side wall; A light emitting element, disposed on the bottom plate and surrounded by the side wall; A packaging body, filled in the cup body and covering the light emitting element, and having an arc surface higher than the side wall; as well as A lens is disposed on the cup body and has a light incident side facing the light emitting element and a light emitting side facing away from the light emitting element, and comprises: An inner arc surface, located at the light incident side and in contact with and in contact with the arc surface; a roof-type optical element, corresponding to the light-emitting element, and comprising a recessed portion and a reflective material filled in the recessed portion, wherein the recessed portion has a curved surface recessed from the light-emitting side toward the light-incoming side; and An outer curved surface is located at the light-emitting side and surrounds the roof-type optical element, wherein the curvature of the curved surface is greater than the curvature of the inner curved surface, and the curvature of the inner curved surface is greater than the curvature of the outer curved surface.

2. The light emitting element packaging structure according to claim 1, characterized in that: The reflectivity of the reflective material is 65% to 95%.

3. The light emitting element packaging structure according to claim 2, characterized in that: The reflective material is a mixture of titanium dioxide and silica gel, white ink or white paint.

4. The light emitting element packaging structure according to claim 1, characterized in that: The transmittance of the reflective material is not greater than 30%.

5. The light emitting element packaging structure according to claim 1, characterized in that: The side wall has an inner wall surface adjacent to the light emitting element and an outer wall surface away from the light emitting element. The lens further has an edge located between the light incident side and the light emitting side, wherein the edge is aligned with the outer wall surface.

6. The light emitting element packaging structure according to claim 5, characterized in that: The inner wall and the bottom plate form an obtuse angle.

7. The light emitting element packaging structure according to claim 1, characterized in that: The range formed by the positive projection of the light emitting element on the bottom plate is located in the range formed by the positive projection of the recessed portion on the bottom plate.

8. The light emitting element packaging structure according to claim 1, characterized in that: The bottom plate has a surface facing the lens, and within the range formed by the orthographic projection of the inner arc surface on the bottom plate, the surface is a flat surface.

9. The light emitting element packaging structure according to claim 1, characterized in that: The light emitting element is a horizontal light emitting diode and is disposed on the base plate in a flip chip manner.

10. The light emitting element packaging structure according to claim 1, characterized in that: The packaging body is a mixture of wavelength conversion material and silica gel.

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