CN113519059B - Image sensor package - Google Patents

Image sensor package Download PDF

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Publication number
CN113519059B
CN113519059B CN202080018862.0A CN202080018862A CN113519059B CN 113519059 B CN113519059 B CN 113519059B CN 202080018862 A CN202080018862 A CN 202080018862A CN 113519059 B CN113519059 B CN 113519059B
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China
Prior art keywords
reflecting surface
image sensor
light
sensor package
reflecting
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CN202080018862.0A
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CN113519059A (en
Inventor
闵丙日
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Rainbow Software Co ltd
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Rainbow Software Co ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
    • H01L27/14—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation
    • H01L27/144—Devices controlled by radiation
    • H01L27/146—Imager structures
    • H01L27/14601—Structural or functional details thereof
    • H01L27/14625—Optical elements or arrangements associated with the device
    • H01L27/14629—Reflectors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
    • H01L27/14—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation
    • H01L27/144—Devices controlled by radiation
    • H01L27/146—Imager structures
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
    • H01L27/14—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation
    • H01L27/144—Devices controlled by radiation
    • H01L27/146—Imager structures
    • H01L27/14601—Structural or functional details thereof
    • H01L27/14618—Containers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
    • H01L27/14—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation
    • H01L27/144—Devices controlled by radiation
    • H01L27/146—Imager structures
    • H01L27/14601—Structural or functional details thereof
    • H01L27/14625—Optical elements or arrangements associated with the device
    • H01L27/14627—Microlenses
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof

Abstract

The invention relates to an image sensor package. The image sensor package includes: a base body on which 2N (where N is a natural number) image sensors are disposed at intervals in a horizontal direction; a light reflection structure provided at an upper portion of the base body so as to be spaced apart from each of the 2N image sensors in a horizontal direction, the light reflection structure having a width gradually narrowing from a lower portion toward an upper portion, and a first left side reflection surface formed at a left side inclined surface of the light reflection structure and a first right side reflection surface formed at a right side inclined surface of the light reflection structure; and a housing accommodating the 2N image sensors and the light reflecting structures inside the housing, wherein a second left reflecting surface opposite to the first left reflecting surface is obliquely formed on at least a part of the left wall, a second right reflecting surface opposite to the first right reflecting surface is obliquely formed on at least a part of the right wall, and a light entrance of the light path is formed on at least a part of the upper surface of the housing.

Description

Image sensor package
Technical Field
The invention relates to an image sensor package.
Background
An image sensor is a device that detects light reflected by an object and outputs an image represented by an electrical signal. The image sensor is constituted by a plurality of pixels that generate an electrical signal corresponding to the amount of light detected. The size of the image sensor is mainly determined by the number of pixels. If the area occupied by the pixels on the surface of the image sensor is increased, for example, the number of pixels or the area of the light receiving portion is increased, the area that the image sensor can detect is also increased. However, the size of the silicon wafer required to fabricate the image sensor is limited, accounting for a significant portion of the manufacturing cost of the image sensor.
The demand for image sensors having large detection areas is relatively stable. An X-ray imaging device is a representative device requiring an image sensor having a large detection area. In order to enlarge the detection area or increase the resolution, various structures in which a plurality of image sensors are arranged have been proposed. The image sensors applied in these structures are commonly used image sensors that are packaged. In the case where the application object is a large-sized device (e.g., an X-ray imaging device, a TV camera, etc.), the physical size of the packaged usual image sensor array does not become a big problem.
Disclosure of Invention
Technical problem to be solved by the invention
The present invention is directed to an image sensor package having a large-area detection area and capable of being mounted to a portable electronic device.
Means for solving the technical problems
According to an aspect of the present invention, there is provided an image sensor package having a large-area detection area. The image sensor package may include: a base on which 2N (where N is a natural number) image sensors are disposed at intervals in a horizontal direction; a light reflection structure provided at an upper portion of the base body so as to be spaced apart from each of the 2N image sensors in a horizontal direction, the light reflection structure having a width gradually narrowing from a lower portion to an upper portion, and a first left side reflection surface formed at a left side inclined surface of the light reflection structure, and a first right side reflection surface formed at a right side inclined surface of the light reflection structure; and a case accommodating the 2N image sensors and the light reflecting structure inside the case, a second left reflecting surface opposing the first left reflecting surface being formed obliquely to at least a part of a left wall of the case, a second right reflecting surface opposing the first right reflecting surface being formed obliquely to at least a part of a right wall of the case, and a light entrance of a light path being formed to at least a part of an upper surface of the case.
As an embodiment, the first left reflecting surface may be parallel to the second left reflecting surface, and the first right reflecting surface may be parallel to the second right reflecting surface.
As an embodiment, N image sensors of the 2N image sensors may be disposed at a lower portion of the second left reflecting surface, and the remaining N image sensors may be disposed at a lower portion of the second right reflecting surface.
As an embodiment, the image sensor package may be closely attached to a lower surface of the display, and the light reflecting structure may divide the light passing through the light entrance into the light toward the second left reflecting surface and the light toward the second right reflecting surface.
As an embodiment, the detection area of the lower surface of the display may be configured of 2N sub-detection areas arranged in a 2×n array, and the 2N image sensors may respectively correspond to the 2N sub-detection areas.
As an embodiment, the first left reflecting surface and the first right reflecting surface may be flat surfaces.
As an embodiment, the second left reflecting surface and the second right reflecting surface may be flat surfaces.
As an embodiment, the second left reflecting surface and the second right reflecting surface may be formed of N curved surfaces arranged in a horizontal direction.
As an embodiment, the first left reflecting surface and the first right reflecting surface may be curved surfaces.
As an embodiment, the second left reflecting surface and the second right reflecting surface may be flat surfaces.
As an embodiment, the second left reflecting surface and the second right reflecting surface may be formed of N concave reflecting surfaces arranged in a horizontal direction.
As an embodiment, the second left reflecting surface may be a single concave reflecting surface curved toward the left wall side, and the second right reflecting surface may be a single concave reflecting surface curved toward the right wall side.
As an embodiment, the image sensor package may further include: a third left reflecting surface obliquely arranged at the lower part of the second left reflecting surface; a fourth left reflecting surface which is disposed obliquely opposite to the third left reflecting surface and is spaced apart in the horizontal direction; a third right reflecting surface obliquely arranged at the lower part of the second right reflecting surface; and a fourth right reflecting surface that is disposed obliquely opposite to the third right reflecting surface and is spaced apart in the horizontal direction.
As an embodiment, the housing may include an upper housing including the second left reflecting surface and the second right reflecting surface, and a lower housing including the third left reflecting surface formed at least a portion of the left wall and the third right reflecting surface formed at least a portion of the right wall.
As an embodiment, the third left reflecting surface may be parallel to the fourth left reflecting surface, and the third right reflecting surface may be parallel to the fourth right reflecting surface.
As an embodiment, the image sensor package may further include: a left light shielding wall extending from the first left reflecting surface to the second left reflecting surface; and a right light shielding wall extending from the first right reflecting surface toward the second right reflecting surface.
As an embodiment, an optical lens may be further included, the optical lens being disposed at an upper portion of the 2N image sensors.
According to an aspect of the present invention, there is provided an image sensor package for implementing a large-area detection area. The image sensor package may include: a base provided with an image sensor having a predetermined incident angle range and a focal distance larger than a thickness of the image sensor package; and a unit reflection structure providing a bent optical path so that light belonging to the predetermined incident angle range reaches the image sensor disposed at a position closer than the focal distance, wherein the unit reflection structure includes: a first reflection surface obliquely arranged to reflect light incident inside after exiting from the detection area; and a second reflection surface that is provided so as to be inclined toward the first reflection surface, and that reflects light from the first reflection surface toward the image sensor.
As an embodiment, the first reflecting surface may be parallel to the second reflecting surface.
As an embodiment, the unit reflecting structure may include: a body optically transparent and providing an optical path through which light entering from the light incident surface passes; the light incidence surface is formed on the upper surface of the body; the first reflection surface is formed obliquely to the lower part of the light incidence surface so as to face the light incidence surface, and reflects light incident through the light incidence surface; the second reflecting surface is formed in parallel with the first reflecting surface so as to face the first reflecting surface, and reflects light from the first reflecting surface; and a light emitting surface formed on a lower portion of the light incident surface so as to face the second reflecting surface, and configured to emit light from the second reflecting surface toward the image sensor.
As an embodiment, the image sensor package may include a pair of unit reflection structures, the first reflection surfaces of the pair of unit reflection structures being disposed opposite to each other and the light incident surfaces being located on the same plane.
As an embodiment, the image sensor package may include a pair of unit reflection structures, the side surfaces of the pair of unit reflection structures connecting the first reflection surface and the second reflection surface being disposed opposite to each other and the light incident surfaces being located on the same plane.
As an embodiment, a side surface connecting the first reflecting surface and the second reflecting surface may be inclined.
Effects of the invention
The image sensor package according to the embodiment of the present invention can have a large-area detection area at relatively low cost compared to the existing image sensor, and in particular, can have a physical size mountable to a portable electronic device.
Drawings
The invention is described below with reference to the embodiments shown in the drawings. To facilitate understanding, identical reference numerals have been given to identical components throughout the several views. The structures shown in the drawings are illustrative of the embodiments of the invention and are not intended to limit the scope of the invention thereto. In particular, some of the constituent elements are exaggerated in the drawings to help to understand the invention. The drawings are means for helping understanding the invention, and therefore, it should be understood that the widths, thicknesses, and the like of the constituent elements shown in the drawings can be different in actual implementation.
Fig. 1 is a diagram showing the principle of an image sensor package.
Fig. 2 is a diagram showing an embodiment of a unit reflection structure.
Fig. 3 is a diagram showing an image sensor package in which a large-area detection area is realized using the unit reflection structure shown in fig. 2.
Fig. 4 is a diagram showing a structure for improving the quality of a sub-fingerprint image generated by an image sensor.
Fig. 5 is a diagram showing other embodiments of the unit reflection structure.
Fig. 6 is a diagram showing an image sensor package in which a large-area detection area is realized using the unit reflection structure shown in fig. 5.
Fig. 7 is a diagram showing still another embodiment of the unit reflection structure.
Fig. 8 is a diagram showing an image sensor package in which a large-area detection area is realized using the unit reflection structure shown in fig. 7.
Fig. 9 is a diagram showing still another embodiment of the unit reflection structure.
Fig. 10 is a diagram showing an image sensor package in which a large-area detection area is realized using the unit reflection structure shown in fig. 9.
Fig. 11 is a diagram showing still another embodiment of the unit reflection structure.
Fig. 12 is a diagram showing an image sensor package in which a large-area detection area is realized using the unit reflection structure shown in fig. 11.
Fig. 13 is a diagram showing still another embodiment of the unit reflection structure.
Fig. 14 is a diagram showing an image sensor package in which a large-area detection area is realized using the unit reflection structure shown in fig. 13.
Fig. 15 is a diagram showing still another embodiment of the unit reflection structure.
Fig. 16 is a diagram showing still another embodiment of the unit reflection structure.
Fig. 17 is a diagram showing an image sensor package in which a large-area detection area is realized using the unit reflection structure shown in fig. 15 and 16.
Detailed Description
The invention is capable of numerous modifications and various embodiments, and specific embodiments are shown in the drawings and described in detail. However, the present invention is not limited to the specific embodiments, and it should be understood that all modifications, equivalents, and alternatives falling within the spirit and technical scope of the present invention are included. In particular, the functions, features, embodiments described below with reference to the drawings can be implemented alone or in combination with other embodiments. Therefore, it should be noted that the scope of the present invention is not limited to the embodiments shown in the drawings.
On the other hand, in terms of the terms used in the present specification, expressions such as "substantially", "almost", "about" and the like are expressions in which a difference (margin) allowed in actual implementation or an error that may occur is taken into consideration. For example, "substantially 90 degrees" should be interpreted to include angles at which the same effect as that at 90 degrees can be obtained. As another example, "almost no" should be interpreted to include to an extent that it can be ignored even if it is somewhat present.
On the other hand, unless otherwise specified, "side" or "horizontal" is used to indicate the left-right direction of the drawing, and "vertical" is used to indicate the up-down direction of the drawing. Further, unless otherwise specified, angles, incident angles, and the like are based on virtual straight lines perpendicular to a horizontal plane shown in the drawings.
The same or similar elements are referred to throughout the drawings using the same reference numerals.
Fig. 1 is a diagram showing the principle of an image sensor package.
The image sensor package 100 may have 2N (where N is a natural number) image sensors 130 disposed therein. The image sensor 130 may be a packaged image sensor or an unpackaged image sensor, among others. The image sensor package 100 may be disposed at a lower portion of the display 11. The electronic device 10 includes a display panel and a cover glass (hereinafter, the display panel and the cover glass are collectively referred to as a display 11) that is provided on an upper portion of the display panel and protects the display panel. The image sensor package 100 can detect panel light (hereinafter referred to as reflected light) that is reflected by the upper surface of the cover glass and proceeds toward the display panel among light (hereinafter referred to as panel light) generated by the display panel. The display panel may turn on the combination of R, G, B pixels, generating panel light that is irradiated toward the subject. Wherein the panel light may be visible light. For example, the panel light may be visible light belonging to a particular band of light, green or blue.
The 2N image sensors 130 disposed within the image sensor package 100 are capable of generating fingerprint images of a finger contacting the upper surface of the display 11. At least a part of the panel light generated by the display panel advances toward the cover glass. When the ridge of the fingerprint contacts the cover glass, a portion of the panel light reaching the contact point of the cover glass-ridge is absorbed by the ridge. In contrast, the panel light reaching the point corresponding to the valley of the fingerprint is reflected toward the lower surface 11b of the display 11. Wherein the reflected light passes through the lower surface 11b of the display 11 to reach the image sensor 130. The reflected light reaches the image sensor 130 at various angles. The reflected light from the locations corresponding to the valleys of the fingerprint is relatively bright and the reflected light from the locations corresponding to the ridges of the fingerprint is relatively dark. Accordingly, the fingerprint image generated by the image sensor 130 may have a morphology in which a relatively dark pattern corresponding to the ridge line of the fingerprint is displayed on an overall brighter background.
The unit reflective structure 100' provides a folded light path 15 through which reflected light passes in order to reach the image sensor 130. In fig. 1 (a) is shown oriented with a thickness t of the electronic device 10 max The optical path 14 of the image sensor 130 with a large focal length is shown in fig. 1 (b) as an optical path 15 bent by the unit reflection structure 100'. The image sensor 130 is capable of detecting light falling within a particular range of angles of incidence θ Incidence angle Internal light. Therefore, as the focal point F is distant from the subject, the area of the detection region 13' corresponding to one image sensor increases. However, within the electronic device 10, the separation distance between the upper surfaces of the image sensor-display is determined by the thickness t of the electronic device max The minimum focal distance required for the image sensor cannot be ensured, or even if the focal distance can be ensured, the area of the detection region 13' that can be detected by the image sensor 130 is greatly reduced. The unit reflection structure 100' bends the light path 14 by the plurality of reflection surfaces 110, 120, thereby maintaining the focal distance of the image sensor 130 and the separation distance between the upper surface of the image sensor and the display is greater than the thickness t of the electronic device max Is small.
The focal distance of the image sensor 130 can be maintained by the unit reflection structure 100', but the contact region 12' and the corresponding detection region 13' are still due to the thickness t of the electronic device 10 max And is limited. To solve this problem, the image sensor package 100 includes a plurality of unit reflection structures 100'. Referring to fig. 1 (c), each of 2N image sensors 130 disposed within the image sensor package 100 corresponds to a portion of the detection region 13. In detail, the detection area 13 of the lower surface 11b of the display 11 is constituted by 2N sub-detection areas 13' arranged in a 2×n arrangement. According to the image sensor package 100 The contact area 12 may be defined at the upper surface 11a of the display 11 in a fixed position. The detection region 13 may be defined at the lower surface 11b corresponding to the contact region 12. The detection region 13 is a region from which light reflected by the contact region 12 is emitted from the display 11.
By providing the unit reflection structure 100 'so that two or more sub-detection regions 13' are in contact with each other, the detection region 13 can be enlarged. Each of the 2N image sensors 130 can maintain a specific focal distance, and thus can generate a fingerprint image corresponding to the sub-detection area 13' substantially without distortion. In order to realize a structure capable of ensuring a sufficient space in the lower portion of the display, an optical lens may be provided between the image sensor and the display to expand the detection area, but light incident through the peripheral portion of the optical lens may cause a distorted image.
Fig. 2 is a diagram showing an embodiment of a unit reflection structure.
The unit reflection structure 101 can reduce the thickness of the image sensor package, and a large detection area can be realized by using a plurality of unit reflection structures 101. For reference, in the drawings including fig. 2, in order to show the optical path of the reflected light, the sub-detection area 13c is shown spaced apart from the first reflection surface. The reflecting surface is an effective surface that actually reflects light, and the unit reflecting structure 101 includes a first reflecting surface 111 and a second reflecting surface 121 that are disposed opposite to each other. The first reflecting surface 111 is disposed obliquely at a lower portion of the sub-detection area 13c, and the second reflecting surface 121 is disposed apart from the first reflecting surface 111 in the horizontal direction. The first reflecting surface 111 and the second reflecting surface 121 are flat surfaces. The area of the first reflecting surface 111 may be the same as that of the second reflecting surface 121 or larger than that of the second reflecting surface 121. As an embodiment, the first reflecting surface 111 and the second reflecting surface 121 may be parallel. As other embodiments, the angle between the first reflective surface 111 and the second reflective surface 121 may be other than 0.
When considering the view angle of the image sensor 130, the width of the optical path 15 may decrease as going from the sub-detection area 13c toward the image sensor 130. If the sub-detection area 13c is assumed to be rectangular and horizontally arranged, the first reflection surface 111 is inclined toward the sub-detection area 13c, so that the angle between the sub-detection area 13c and the first reflection surface 111 is an acute angle, and the shape of the first reflection surface 111 may be a quadrangle or an inverted trapezoid. The lateral side 111' of the first reflecting surface 111 may be in contact with or in the vicinity of the sub-detection region 13c, so that the size of the lateral side 111' of the first reflecting surface 111 may be the same as or smaller than the size of the lateral side 13c ' of the sub-detection region 13c, and the size of the longitudinal side 111″ of the first reflecting surface 111 may be the same as or larger than the size of the longitudinal side 13c″ of the sub-detection region 13 c. On the other hand, the second reflecting surface 121 is disposed so as to face the first reflecting surface 111, so that an angle between the second reflecting surface 121 and the sub-detection area 13c is an obtuse angle, and the shape of the second reflecting surface 121 may be a quadrangle or an inverted trapezoid. The second reflecting surface 121 is disposed apart from the first reflecting surface 111 in the horizontal direction, and therefore the size of the lateral side 121 'and the longitudinal side 121″ may be smaller than the size of the lateral side 111' and the longitudinal side 111″ of the first reflecting surface 111.
The first reflecting surface 111 reflects light from the sub-detection area 13c toward the second reflecting surface 121, and the second reflecting surface 121 reflects light toward the image sensor 130. The end surface 131 of the optical path 15 reaching the image sensor 130 through the first and second reflection surfaces 111 and 121 being bent may be substantially the same shape as the sub-detection area 13 c.
Fig. 3 is a diagram showing an image sensor package in which a large-area detection area is realized using the unit reflection structure shown in fig. 2, fig. 3 (a) shows a cross section of the image sensor package, and fig. 3 (b) is a split perspective view of the image sensor package.
The detection area 13 can be doubled by connecting a pair of unit reflection structures 101L, 101R. As shown in fig. 3 (a), a pair of unit reflecting structures 101L, 101R may be disposed such that an upper end of the first left reflecting surface 111L is connected with an upper end of the first right reflecting surface 111R. In detail, the pair of unit reflecting structures 101L, 101R are symmetrical. On the other hand, the N pairs of unit reflecting structures 101 may be disposed continuously in the horizontal direction. In detail, referring again to fig. 2, the n pairs of unit reflecting structures 101 are disposed along the lateral sides 111' of the first inclined surfaces 111. Therefore, in the image sensor package 100 in which the N pairs of unit reflection structures 101 are disposed in the horizontal direction, the lengths of the lateral sides of the first left side reflection surface 111L and the first right side reflection surface 111R may be the same as or greater than N times the length of the lateral side 111' of the first inclined surface 111. On the other hand, the length of the lateral sides of the second left reflecting surface 121L and the second right reflecting surface 121R may be the same as the length of the first left reflecting surface 111L or smaller than the length of the first left reflecting surface 111L.
Although not shown, as an example, light absorbing substances may be applied to the first left reflecting surface 111L, the first right reflecting surface 111R, the second left reflecting surface 121L, and the second right reflecting surface 121R in regions other than the light path regions. Here, the light path region is an effective reflection surface where light incident on the image sensor 130 is reflected, and the region other than the light path is an ineffective reflection surface where light not incident on the image sensor 130 is reflected. As other embodiments, in the first left reflecting surface 111L and the first right reflecting surface 111R, the regions other than the optical paths may be inclined at different angles from the first left reflecting surface 111L and the first right reflecting surface 111R. Similarly, in the second left reflecting surface 121L and the second right reflecting surface 121R, the regions other than the optical paths may be inclined at different angles from the second left reflecting surface 121L and the second right reflecting surface 121R.
The image sensor package 100 may include a housing 140, a light reflecting structure 152, and a base 150. A light reflecting structure 152 is provided on the upper surface 151 of the base 150. The 2×2 image sensors 130L, 130R may be arranged in a row of two on the left and right of the light reflecting structure 152. The light reflecting structure 152 has a cross section that gradually narrows from the lower portion toward the upper portion, and may be triangular or tapered, for example. Accordingly, the left inclined surface of the light reflecting structure 152 is the first left reflecting surface 111L that reflects the light from the left sub-detection regions 130c, 130d, and the right inclined surface of the light reflecting structure 152 is the first right reflecting surface 111R that reflects the light from the right sub-detection regions 130a, 130 b. First left side The angle θ between the reflective surface 111L and the detection region and the first right reflective surface 111R 1 Is an acute angle.
A second left reflecting surface 121L is formed on the left wall 140L of the case 140, and a second right reflecting surface 121R is formed on the right wall 140R. As an example, the second left reflecting surface 121L may be formed at least a portion of the left wall 140L. In detail, the left wall 140L may include a left wall inner upper face 143L, a left wall lower face 144L closer to the left side than the left wall inner upper face 143L, and a second left reflecting face 121L connected to a lower end of the left wall inner upper face 143L and an upper end of the left wall lower face 144L. Similarly, right wall 140R may include a right wall inside upper face 143R, a right wall lower face 144R closer to the right than right wall inside upper face 143R, and a second right side reflecting face 121R connected to the lower end of right wall inside upper face 143R and the upper end of right wall lower face 144R. The second left reflecting surface 121L and the second right reflecting surface 121R form an angle θ with the detection region 2 Is an obtuse angle. The light entrance 142 is formed on the upper surface 141 of the case 140 in a manner corresponding to the detection region 13.
N image sensors 130L may be disposed at a lower portion of the second left reflecting surface 121L, and N image sensors 130R may be disposed at a lower portion of the second right reflecting surface 121R. That is, the plurality of image sensors 130L, 130R are covered by the upper surface 141 of the case 140, so that light from the periphery of the detection region 13 is not incident on the plurality of image sensors 130L, 130R. As shown in fig. 3 (b), the two image sensors 130L disposed on the left side are capable of detecting light from the sub-detection areas 13a, 13b of the display 11 and generating sub-fingerprint images, and the two image sensors 130R disposed on the right side are capable of detecting light from the sub-detection areas 13c, 13d of the display 11 and generating sub-fingerprint images.
Fig. 4 is a diagram showing a structure for improving the quality of a sub-fingerprint image generated by an image sensor. The explanation repeated with fig. 3 is omitted, and the differences are mainly explained.
The image sensor package 100 may include a left side light shielding wall 160L and a right side light shielding wall 160R. The left side shielding wall 160L may optically separate a plurality of image sensors provided on the left side, and the right side shielding wall 160R may optically separate a plurality of image sensors provided on the right side. As shown in fig. 4, the first and second sub-detection regions 13a and 13b and the third and fourth sub-detection regions 13c and 13d may be substantially optically separated by the light reflection structure 152. Therefore, the light from the third sub-detection area 13c and the fourth sub-detection area 13d does not actually reach the two image sensors 160L provided on the left side, and the light from the first sub-detection area 13a and the second sub-detection area 13b does not actually reach the two image sensors 160R provided on the right side. On the other hand, light from the first sub-detection area 13a may reach the image sensor corresponding to the second sub-detection area 13b, and light from the second sub-detection area 13b may reach the image sensor corresponding to the first sub-detection area 13 a. The left light blocking wall 160L blocks light incident from the non-corresponding sub-detection area, so that the plurality of image sensors juxtaposed on the left side can be optically separated, and the right light blocking wall 160R blocks light incident from the non-corresponding sub-detection area, so that the plurality of image sensors juxtaposed on the right side can be optically separated. The left light shielding wall 160L may extend from the first left inclined slope 111L to the second left inclined slope 121L in the lateral direction, and the right light shielding wall 160R may extend from the first right inclined slope 111R to the second right inclined slope 121R.
The image sensor package 100 may include optical lenses 170L, 170R disposed at an upper portion of the image sensor 130. The optical lenses 170L and 170R may collect light incident on the image sensor 130 at a light receiving portion of the image sensor.
Fig. 5 is a diagram showing other embodiments of the unit reflection structure. The explanation repeated with fig. 2 is omitted, and the differences are mainly explained.
The unit reflection structure 102 can reduce the thickness of the image sensor package, and a large detection area can be realized by using a plurality of unit reflection structures 102. The unit reflective structure 102 includes a first reflective surface 112 and a second reflective surface 122 disposed opposite to each other. The first reflecting surface 122 is obliquely disposed at a lower portion of the sub-detection area 13c, and the second reflecting surface 122 is disposed apart from the first reflecting surface 112 in the horizontal direction. The first reflective surface 112 is curved and the second reflective surface 122 is planar. That is, the first reflecting surface 112 is a concave reflecting surface curved with respect to a first virtual plane 112p defined by first to fourth corners, i.e., 112a to 112d, of the first reflecting surface 112, and a straight line connecting points on the first reflecting surface 112 farthest from the first virtual plane 112p in the vertical direction may be parallel to a longitudinal center line 112p' of the first virtual plane 112 p. As an embodiment, the first virtual plane 112p and the second reflecting surface 122 may be parallel. As other embodiments, the angle between the first virtual plane 112p and the second reflective surface 122 may be other than 0.
When considering the view angle of the image sensor 130, the width of the optical path 15 may gradually decrease from the sub-detection area 13c toward the image sensor 130. If the sub-detection area 13c is assumed to be rectangular and horizontally arranged, the first reflection surface 112 is a concave reflection surface inclined toward the sub-detection area 13c, so that the angle between the sub-detection area 13c and the first virtual plane 112p is an acute angle, and the shape of the first virtual plane 112p may be a quadrangle or an inverted trapezoid. The lateral sides 112a-112b of the first virtual plane 112p may meet or be located adjacent to the sub-detection area 13c, so that the size of the lateral sides 112a-112b of the first virtual plane 112p may be the same as or smaller than the size of the lateral side 13c' of the sub-detection area 13c, and the size of the longitudinal sides 112a-112c, 112b-112d of the first virtual plane 112p may be the same as or larger than the size of the longitudinal side 13c″ of the sub-detection area 13 c. On the other hand, the second reflecting surface 122 is disposed so as to face the first reflecting surface 112, so that the angle between the second reflecting surface 122 and the sub-detection area 13c is an obtuse angle, and the shape of the second reflecting surface 122 may be a quadrangle or an inverted trapezoid. The second reflective surface 122 is spaced apart from the first reflective surface 112 in the horizontal direction, so that the size of the lateral edge 122' and the longitudinal edge 122″ may be smaller than the size of the longitudinal edges 112a-112c and the lateral edges 112c-112d of the first virtual plane 112 p. On the other hand, since the first reflecting surface 112 is a curved concave reflecting surface as compared with the first reflecting surface 111 of fig. 2, light is more collected in the horizontal direction. Accordingly, the size of the lateral edge 122' of the second reflective surface 122 may be the same as the size of the lateral edge 121' of fig. 2 or smaller than the size of the lateral edge 121' of fig. 2.
The first reflecting surface 112 reflects the light from the sub-detection area 13c toward the second reflecting surface 122, and the second reflecting surface 122 reflects the light toward the image sensor 130. The lateral width of the end face 132 of the optical path 15 reaching the image sensor 130 through the first and second reflection surfaces 112 and 122 being bent may be smaller than the lateral width of the sub-detection area 13 c.
Fig. 6 is a diagram showing an image sensor package in which a large-area detection area is realized using the unit reflection structure shown in fig. 5, fig. 6 (a) shows a cross section of the image sensor package, and fig. 6 (b) is a split perspective view of the image sensor package. The explanation repeated with fig. 3 is omitted, and the differences are mainly explained.
The detection area 13 can be doubled by connecting a pair of unit reflection structures 102L, 102R. As shown in fig. 6 (a), a pair of unit reflecting structures 102L, 102R may be disposed such that an upper end of the first left reflecting surface 112L is connected to an upper end of the first right reflecting surface 112R. In detail, the pair of unit reflecting structures 102L, 102R are symmetrical. On the other hand, the N pairs of unit reflecting structures 102 may be disposed continuously in the horizontal direction. Referring again to fig. 5,N, the unit reflecting structures 102 are disposed along the lateral sides 112a-112b of the first virtual plane 112 p.
Although not shown, as an example, light absorbing substances may be applied to the first left reflecting surface 112L, the first right reflecting surface 112R, the second left reflecting surface 122L, and the second right reflecting surface 122R in regions other than the light path regions. As other embodiments, in the first left reflecting surface 112L and the first right reflecting surface 112R, the regions other than the optical paths may be inclined at different angles from the first left reflecting surface 112L and the first right reflecting surface 112R. Similarly, in the second left-side reflecting surface 122L and the second right-side reflecting surface 122R, regions other than the optical path may be inclined at different angles from the second left-side reflecting surface 122L and the second right-side reflecting surface 122R.
The light reflecting structure 152 may be triangular or tapered in cross-section. Therefore, the first left reflecting surface 112L formed on the left inclined surface of the light reflecting structure 152 and the first right reflecting surface 112R formed on the right inclined surface are concave reflecting surfaces curved in the center direction of the light reflecting structure 152. Accordingly, N concave reflecting surfaces may be formed on the left side inclined surface of the light reflecting structure 152, and N concave reflecting surfaces may be formed on the right side inclined surface of the light reflecting structure 152.
A second left reflecting surface 122L is formed on the left wall 140L of the case 140, and a second right reflecting surface 122R is formed on the right wall 140R. As an example, the second left reflecting surface 122L may be formed at least a portion of the left wall 140L, and the second right reflecting surface 122R may be formed at least a portion of the right wall 140R. When compared with fig. 3, the areas of the second left reflecting surface 122L and the second right reflecting surface 122R may be the same as the areas of the second left reflecting surface 121L and the second right reflecting surface 121R or smaller than the areas of the second left reflecting surface 121L and the second right reflecting surface 121R.
Fig. 7 is a diagram showing still another embodiment of the unit reflection structure. The differences from fig. 2 and 5 will be mainly described.
The unit reflection structure 103 can reduce the thickness of the image sensor package, and a large-area detection region can be realized by using a plurality of unit reflection structures 103. The unit reflecting structure 103 includes a first reflecting surface 111 and a second reflecting surface 123 disposed opposite to each other. The first reflecting surface 111 is a plane surface, and the second reflecting surface 123 is a curved surface. That is, the second reflecting surface 123 is a concave reflecting surface curved with respect to a second virtual plane 123p defined by first to fourth corners, i.e., 123a to 123d, of the second reflecting surface 123, and a straight line connecting points on the second reflecting surface 123 farthest from the second virtual plane 123p in the vertical direction may be parallel to a longitudinal center line 123p' of the second virtual plane 123 p. As an embodiment, the first reflecting surface 111 and the second virtual plane 123p may be parallel. As other embodiments, the angle between the first reflective surface 111 and the second virtual plane 123p may be other than 0.
If the sub-detection area 13c is assumed to be rectangular and horizontally arranged, the first reflection surface 111 is inclined toward the sub-detection area 13c, so that the angle between the sub-detection area 13c and the first reflection surface 111 is an acute angle, and the shape of the first reflection surface 111 may be a quadrangle or an inverted trapezoid. The second reflecting surface 123 is disposed toward the first reflecting surface 111, an angle between the second virtual plane 123p and the sub-detection area 13c is an obtuse angle, and the shape of the second virtual plane 123p may be a quadrangle or an inverted trapezoid. On the other hand, the second reflecting surface 123 is a curved concave reflecting surface as compared with the second reflecting surface 121 of fig. 2, so that light is more collected in the horizontal direction. Therefore, the lateral width of the end face 133 of the optical path reaching the image sensor 130 through the first and second reflection surfaces 111 and 123 being bent may be smaller than the lateral width of the sub-detection area 13 c.
Fig. 8 is a diagram showing an image sensor package in which a large-area detection area is realized using the unit reflection structure shown in fig. 7, fig. 8 (a) shows a cross section of the image sensor package, and fig. 8 (b) is a split perspective view of the image sensor package. The differences from fig. 3 and 6 will be mainly described.
The detection area 13 can be doubled by connecting a pair of unit reflection structures 103L, 103R. As shown in fig. 8 (a), a pair of unit reflecting structures 103L, 103R may be provided such that an upper end of the first left reflecting surface 111L is connected to an upper end of the first right reflecting surface 111R. In detail, the pair of unit reflecting structures 103L, 103R are symmetrical. On the other hand, the N pairs of unit reflecting structures 103 may be disposed continuously in the horizontal direction.
A second left reflecting surface 123L is formed on the left wall 140L of the case 140, and a second right reflecting surface 123R is formed on the right wall 140R. The second left reflecting surface 123L is a concave reflecting surface curved toward the left wall 140L, and the second right reflecting surface 123R is a concave reflecting surface curved toward the right wall 140R. Accordingly, N concave reflecting surfaces may be formed at the left wall 140L of the case 140, and N concave reflecting surfaces may be formed at the right wall 140R.
Fig. 9 is a diagram showing still another embodiment of the unit reflection structure. The differences from fig. 2, 5 and 7 will be mainly described.
The unit reflection structure 104 can reduce the thickness of the image sensor package, and a large-area detection region can be realized by using a plurality of unit reflection structures 104. The unit reflective structure 104 includes a first reflective surface 112 and a second reflective surface 124 disposed opposite to each other. The first reflecting surface 112 and the second reflecting surface 124 are curved surfaces. That is, the first reflecting surface 112 is a concave reflecting surface curved with respect to a first virtual plane 112p defined by first to fourth corners, i.e., 112a to 112d, of the first reflecting surface 112, and a straight line connecting points on the first reflecting surface 112 farthest from the first virtual plane 112p in the vertical direction may be parallel to a longitudinal center line 112p' of the first virtual plane 112 p. On the other hand, the second reflecting surface 124 is a concave reflecting surface curved with respect to a second virtual plane 124p defined by first to fourth corners 124a to 124d of the second reflecting surface 124, and a straight line connecting points on the second reflecting surface 124 farthest from the second virtual plane 124p in the vertical direction may be parallel to a longitudinal center line 124p' of the second virtual plane 124 p. As an example, the first virtual plane 112p and the second virtual plane 124p may be parallel. As other embodiments, the angle between the first virtual plane 112p and the second virtual plane 124p may be other than 0.
If the sub-detection area 13c is assumed to be rectangular and horizontally arranged, the first reflection surface 112 is a concave reflection surface inclined toward the sub-detection area 13c, so that the angle between the sub-detection area 13c and the first virtual plane 112p is an acute angle, and the shape of the first virtual plane 112p may be a quadrangle or an inverted trapezoid. The second reflecting surface 124 is disposed toward the first reflecting surface 112, an angle between the second virtual plane 124p and the sub-detecting area 13c is an obtuse angle, and the shape of the second virtual plane 124p may be a quadrangle or an inverted trapezoid. On the other hand, since the light collected in the horizontal direction reaches the second reflecting surface 124 from the first reflecting surface 112 as compared with the second reflecting surface 123 of fig. 7, the size of the lateral sides 124a-124b of the second virtual plane 124p may be the same as the size of the lateral sides 123a-123b of the second virtual plane 123p or smaller than the size of the lateral sides 123a-123b of the second virtual plane 123 p.
The first reflecting surface 112 reflects the light from the sub-detection area 13c toward the second reflecting surface 124, and the second reflecting surface 124 reflects the light toward the image sensor 130. The lateral width of the end face 134 of the optical path reaching the image sensor 130 through the first and second reflection surfaces 112 and 124 being bent may be smaller than the lateral width of the sub-detection area 13 c.
Fig. 10 is a diagram showing an image sensor package in which a large-area detection area is realized using the unit reflection structure shown in fig. 9, fig. 10 (a) shows a cross section of the image sensor package, and fig. 10 (b) is a split perspective view of the image sensor package. The differences from fig. 3, 6 and 8 will be mainly described.
The detection area 13 can be doubled by connecting a pair of unit reflection structures 104L, 104R. As shown in fig. 10 (a), a pair of unit reflecting structures 104L, 104R may be provided such that an upper end of the first left reflecting surface 112L and an upper end of the first right reflecting surface 112R are connected. In detail, the pair of unit reflecting structures 104L, 104R are symmetrical. On the other hand, the N pairs of unit reflecting structures 104 may be disposed continuously in the horizontal direction.
The light reflecting structure 152 may be triangular or tapered in cross-section. Therefore, the first left reflecting surface 114L formed on the left inclined surface of the light reflecting structure 152 and the first right reflecting surface 112R formed on the right inclined surface are concave reflecting surfaces curved in the center direction of the light reflecting structure 152. Accordingly, N concave reflecting surfaces may be formed at the left inclined slope of the light reflecting structure 152, and N concave reflecting surfaces may be formed at the right inclined slope.
A second left reflecting surface 124L is formed on the left wall 140L of the case 140, and a second right reflecting surface 124R is formed on the right wall 140R. The second left reflecting surface 124L is a concave reflecting surface curved toward the left wall 140L, and the second right reflecting surface 124R is a concave reflecting surface curved toward the right wall 140R. Accordingly, N concave reflecting surfaces may be formed at the left wall 140L of the case 140, and N concave reflecting surfaces may be formed at the right wall 140R.
Fig. 11 is a diagram showing still another embodiment of the unit reflection structure. The difference points will be mainly described by omitting the explanation repeated with fig. 9.
The unit reflection structure 105 can reduce the thickness of the image sensor package, and a large-area detection region can be realized by using a plurality of unit reflection structures 105. The unit reflecting structure 105 includes a first reflecting surface 112 and a second reflecting surface 125 disposed opposite to each other. The first reflective surface 112 and the second reflective surface 125 are concave reflective surfaces. The second reflecting surface 124 is a concave reflecting surface curved with respect to a second virtual plane 125p defined by first to fourth corners, i.e., 125a to 125d, of the second reflecting surface 125, and a straight line connecting points on the second reflecting surface 125 farthest from the second virtual plane 125p in the horizontal direction may be parallel to a lateral center line 125p' of the second virtual plane 125 p. As an embodiment, the first virtual plane 112p and the second virtual plane 125p may be parallel. As other embodiments, the angle between the first virtual plane 112p and the second virtual plane 125p may be other than 0. The light reflected by the first reflecting surface 112 is collected in the horizontal direction to reach the second reflecting surface 125, and the light reflected by the second reflecting surface 125 is collected in the vertical direction to reach the image sensor 130.
Fig. 12 is a diagram showing an image sensor package in which a large-area detection area is realized using the unit reflection structure shown in fig. 11, fig. 12 (a) shows a cross section of the image sensor package, and fig. 12 (b) is a split perspective view of the image sensor package. The differences from fig. 3, 6, 8 and 10 will be mainly described.
The detection area 13 can be doubled by connecting a pair of unit reflection structures 105L, 105R. As shown in fig. 12 (a), a pair of unit reflection structures 105L, 105R may be provided such that an upper end of the first left reflection surface 112L and an upper end of the first right reflection surface 112R are connected. In detail, the pair of unit reflecting structures 105L, 105R are symmetrical. On the other hand, the N pairs of unit reflecting structures 105 may be disposed continuously in the horizontal direction.
The light reflecting structure 152 may be triangular or tapered in cross-section. Therefore, the first left reflecting surface 114L formed on the left inclined surface of the light reflecting structure 152 and the first right reflecting surface 112R formed on the right inclined surface are concave reflecting surfaces curved in the center direction of the light reflecting structure 152. Accordingly, N concave reflecting surfaces may be formed at the left inclined slope of the light reflecting structure 152, and N concave reflecting surfaces may be formed at the right inclined slope.
A second left reflecting surface 125L is formed on the left wall 140L of the case 140, and a second right reflecting surface 125R is formed on the right wall 140R. The second left reflecting surface 125L may be a single concave reflecting surface curved to the left wall 140L side, and the second right reflecting surface 125R may be a single concave reflecting surface curved to the right wall 140R side.
Fig. 13 is a diagram showing still another embodiment of the unit reflection structure.
The unit reflective structure 106 provides a folded light path 15 through which reflected light passes in order to reach the image sensor 130. The unit reflection structure 106 can reduce the thickness of the image sensor package, and a large detection area can be realized by using a plurality of unit reflection structures 106. In comparison with the structures illustrated in fig. 2 to 12, the unit reflective structure 106 further includes a third reflective surface 183 and a fourth reflective surface 184. The third reflective surface 183 is disposed obliquely below the second reflective surface 121 so as to oppose the second reflective surface 121, and the fourth reflective surface 184 is disposed obliquely so as to oppose the third reflective surface 183 and to be spaced apart from the third reflective surface 183 in the horizontal direction. The area of the third reflective surface 183 may be the same as or smaller than the area of the second reflective surface 121, and the area of the fourth reflective surface 184 may be the same as or smaller than the area of the third reflective surface 183. As an example, the third reflecting surface 183 and the fourth reflecting surface 184 may be parallel. As other embodiments, the angle between the third reflecting surface 183 and the fourth reflecting surface 184 may be other than 0. On the other hand, although not shown, one or more of the first to fourth reflection surfaces 111, 121, 183, 134 may be curved.
When considering the view angle of the image sensor 130, the width of the optical path 15 may gradually decrease from the sub-detection area 13c toward the image sensor 130. If the sub-detection area 13c is assumed to be a horizontally provided rectangular shape, the third reflection surface 183 is provided to face the second reflection surface 121, so that the angle between the sub-detection area 13c and the third reflection surface 183 is an acute angle, and the shape of the third reflection surface 183 may be a quadrangle or an inverted trapezoid. Since the fourth reflective surface 184 is disposed opposite to the third reflective surface 183, an angle between the sub-detection area 13c and the fourth reflective surface 184 is an obtuse angle, and the shape of the fourth reflective surface 184 may be a quadrangle or an inverted trapezoid.
Fig. 14 is a diagram showing an image sensor package in which a large-area detection area is realized using the unit reflection structure shown in fig. 13, fig. 14 (a) shows a cross section of the image sensor package, and fig. 14 (b) is a split perspective view of the image sensor package.
The detection area 13 can be doubled by connecting a pair of unit reflection structures 106L, 106R. As shown in fig. 14 (a), a pair of unit reflection structures 106L, 106R may be provided such that an upper end of the first left reflection surface 111L and an upper end of the first right reflection surface 111R are connected. In detail, the pair of unit reflecting structures 106L, 106R are symmetrical. On the other hand, the N pairs of unit reflecting structures 106L, 106R may be disposed continuously in the horizontal direction.
The image sensor package 100 may include an upper case 140, a light reflecting structure 152, a lower case 180, and a base 150. An image sensor 130 is provided on an upper surface 151 of the substrate 150. Wherein the image sensor 130 may be more than one. The third left reflecting surface 183L and the third right reflecting surface 183R and the fourth left reflecting surface 184L and the fourth right reflecting surface 184R form a focal point of light from the detection region 13 at a lower portion of the light reflecting structure 152. In particular, according to the combination of the distance and the inclination angle between the third left side reflecting surface 183L and the third right side reflecting surface 183R and/or the distance and the inclination angle between the fourth left side reflecting surface 184L and the fourth right side reflecting surface 184R, the focal point of the light passing through the left side unit reflecting structure 106L and the right side unit reflecting structure 106R may be formed relatively closer than or substantially the same as the case shown in fig. 1 to 12. Therefore, a plurality of image sensors having a small area of the light receiving portion may be provided at the lower portions of the fourth left reflecting surface 184L and the fourth right reflecting surface 184R, or one image sensor having a large area of the light receiving portion may be provided at the lower portions of the fourth left reflecting surface 184L and the fourth right reflecting surface 184R.
First left reflecting surface 111L and first rightThe reflection surface 111R is provided in the upper case 140 so as to face the second left reflection surface 121L and the second right reflection surface 121R, respectively. The second left reflecting surface 121L and the second right reflecting surface 121R are formed on the left wall 140L and the right wall 140R of the upper case 140, respectively. The third left reflecting surface 183L and the third right reflecting surface 183R are formed on the left wall 180L and the right wall 180R of the lower case 180, respectively. The fourth left reflecting surface 184L and the fourth right reflecting surface 184R are provided in the lower case 180 so as to face the third left reflecting surface 183L and the third right reflecting surface 183R, respectively. The angle θ between the third left reflecting surface 183L and the third right reflecting surface 183R and the detection region 3 Is an acute angle, and the angle θ between the fourth left side reflection surface 184L and the fourth right side reflection surface 184R and the detection area 4 Is an obtuse angle.
The first light entrance 142 is formed on the upper surface 141 of the case 140 in a manner corresponding to the detection region 13. The second left light entrance port 182L through which the light reflected by the second left reflecting surface 121L passes is formed on the left side of the upper surface 181 of the lower case 180, and the second right light entrance port 182R through which the light reflected by the second right reflecting surface 121R passes is formed on the right side of the upper surface 181.
Fig. 15 is a view showing still another embodiment of the unit reflecting structure, fig. 15 (a) shows a cross section, a front surface, a back surface, an upper surface, and a bottom surface of the unit reflecting structure, and fig. 15 (b) is a perspective view of the unit reflecting structure. The differences from fig. 3, 6, 8 and 10 will be mainly described.
Referring to fig. 15 (a) and (b), the unit reflecting structure 107 includes a body 1071 that is optically transparent and has a polygonal cross section. The body 1071 may have a refractive index different from that of air. The body 1071 provides an optical path through which light incident into the interior passes, the optical path being folded at least twice. The image sensor provided at the image sensor package 100 may receive light belonging to a predetermined incident angle range and may have a predetermined focal distance. The focal distance of the image sensor may be greater than the thickness of the image sensor package 100. The body 1071 bends the optical path of light incident inside the body 1071 so that light of a predetermined range of incident angles reaches an image sensor provided in the image sensor package 100. The folded light path enables light of a predetermined range of incidence angles to be collected at the image sensor even if the maximum distance between the image sensor and the detection area is limited within the thickness of the image sensor package 100.
The body 1071 has a plurality of surfaces including a light incident surface 1072, a first reflecting surface 111, a second reflecting surface 121, and a light emitting surface 1073. The light incident surface 1072 may be in contact with the detection region or may be located at a lower portion of the detection region. The light exit surface 1073 may be located at an upper portion of the image sensor. More than one image sensor may be provided at the lower portion of the light exit surface 1073. The plurality of effective areas on the light incident surface 1072 and the light emitting surface 1703 through which light of a predetermined incident angle range passes may not overlap each other when viewed from above the unit reflecting structure 107. For example, the light entrance face 1072 and the light exit face 1703 may be substantially parallel planes.
The first reflecting surface 111 is formed obliquely at a lower portion of the light incident surface 111. At least a part of the plurality of effective areas on the first reflection surface 111 and the light incidence surface 1072 through which light of a predetermined incident angle range passes may overlap when viewed from above the unit reflection structure 107. The first reflection surface 111 reflects light that enters the body 1071 through the light incidence surface 111 and falls within a predetermined range of incidence angles so as to face the second inclined surface 121. The first reflecting surface 111 may be a plane or a curved surface. As an example, the first reflecting surface 111 may be entirely coated with a substance that reflects light to reflect light. As another example, at least a part of the first reflecting surface 111 may be coated with a substance that reflects light to reflect light. That is, only the effective reflection region where light belonging to the predetermined incident angle range reaches may be coated with the substance that reflects light, and the remaining region may not be coated with the substance that reflects light, or a light absorbing substance may be coated.
The second reflecting surface 121 is formed obliquely toward the first reflecting surface 111. For example, the second reflection surface 121 may extend obliquely from one side of the light incident surface 1072. The second reflecting surface 121 reflects light from the first reflecting surface 111 within a predetermined range of incidence angles toward the light emitting surface 1073. The second reflecting surface 121 may be a plane or a curved surface. As an example, the second reflecting surface 121 may be entirely coated with a substance that reflects light to reflect light. As another example, at least a part of the second reflecting surface 121 may be coated with a substance that reflects light to reflect light. That is, only the effective region 1211, which is reached by light belonging to a predetermined incident angle range, may be coated with a substance that reflects light, and the remaining region is not coated with a substance that reflects light, or a light absorbing substance is coated.
The light emitting surface 1073 is formed below the second reflecting surface 121. At least a part of the plurality of effective areas on the second reflecting surface 121 and the light emitting surface 1073 through which light of a predetermined incident angle range passes may overlap when viewed from above the unit reflecting structure 107. One or more image sensors may be provided at a lower portion of the light exit surface 1073. More than two image sensors may be disposed apart in the horizontal direction. An optical lens (170R, 170L in fig. 4) may be provided between the light emitting surface 1073 and the image sensor.
Fig. 16 is a view showing still another embodiment of the unit reflecting structure, fig. 16 (a) shows a cross section, a front surface, a back surface, an upper surface, and a bottom surface of the unit reflecting structure, and fig. 16 (b) is a perspective view of the unit reflecting structure. The differences from fig. 3, 6, 8, 10 and 15 will be mainly described.
Referring to fig. 16 (a) and (b), the unit reflecting structure 108 includes a body 1081 that is optically transparent and polygonal in cross section. The body 1081 has a plurality of surfaces including a light incident surface 1082, a first reflecting surface 111, a second reflecting surface 121, and a light emitting surface 1183. The area of the second reflecting surface 121 may be reduced to substantially the same area as the effective area 1211 of fig. 15, as compared with fig. 15. For example, light belonging to a predetermined incident angle range can reach the second reflecting surface 121, and other light cannot substantially reach the second reflecting surface 121. As an example, the sides 1084, 1085 of the unit reflective structure 108 may be inclined surfaces. The side surfaces 1084, 1085 may extend from the hypotenuse of the first reflective surface 111 toward the active area on the second angled surface 121. The inclined side surfaces 1084 and 1085 allow the light incident surface 1082 and the light emitting surface 1083 to have tapered shapes with widths decreasing from the first reflecting surface 111 toward the second reflecting surface 121. As other embodiments, although not shown, the remaining area of the second inclined surface 121 other than the effective area may be a plane inclined at an angle different from the effective area.
Fig. 17 is a diagram showing an image sensor package in which a large-area detection region is realized using the unit reflection structure shown in fig. 15 and 16, fig. 17 (a) is a split perspective view of the image sensor package including the unit reflection structure of fig. 15, and fig. 17 (b) is a split perspective view of the image sensor package including the unit reflection structure of fig. 16.
By providing the light incident surfaces 1072, 1082 of the plurality of unit reflecting structures 107, 108 on the same plane, a large-area detection area can be realized. For example, a pair of unit reflecting structures 107a, 107d may be disposed with the first reflecting surface 111 facing each other, or a pair of unit reflecting structures 107a, 107b may be disposed with the sides connecting the first reflecting surface 111 and the second reflecting surface 121 facing each other. In this way, the 4 unit reflecting structures 107a, 107b, 107c, 107d may be disposed such that the light incident surfaces 1072 meet each other and lie substantially on the same plane. In the same manner, the 4 unit reflecting structures 108a, 108b, 108c, 108d may also be arranged such that the light incident surfaces 1082 are substantially on the same plane.
On the other hand, the unit reflecting structures 107, 108 may extend in a direction perpendicular to the cross section. When extending in a direction perpendicular to the cross section, the light incident surfaces 1072 and 1082 and the light emitting surfaces 1073 and 1083 are expanded in addition to the expansion of the first reflecting surface 111 and the second reflecting surface 121. Therefore, two or more image sensors may be provided below the light emitting surfaces 1073 and 1083.
The image sensor package 100 may include a housing 140, a light reflecting structure 152, and a base 150. More than one unit reflecting structures 107a to 107d, 108a to 108d are provided on the upper surface of the substrate 150. The light reflecting structure 152 having a triangular or tapered cross section may support the unit reflecting structures 107a to 107d or the first inclined surfaces 111 of 108a to 108d. In addition, the left and right inclined surfaces of the light reflecting structure 152 may be coated with a substance that reflects light. The case 140 may house therein a light reflecting structure 152 supporting the plurality of unit reflecting structures 107a to 107d or 108a to 108d and the unit reflecting structure.
It should be understood that the above description of the present invention is for illustration, and that a person skilled in the art can easily modify the present invention into other specific embodiments without changing the technical idea or essential features of the present invention. The above-described embodiments are, therefore, to be considered in all respects as illustrative and not restrictive.
The scope of the present invention is indicated by the following claims rather than by the foregoing detailed description, and all changes and modifications that come within the meaning and range of equivalency of the claims are intended to be embraced therein.

Claims (21)

1. An image sensor package for implementing a large area detection area, the image sensor package comprising:
a base on which 2N image sensors are disposed at intervals in a horizontal direction, wherein N is a natural number;
a light reflection structure provided at an upper portion of the base body so as to be spaced apart from each of the 2N image sensors in a horizontal direction, the light reflection structure having a width gradually narrowing from a lower portion to an upper portion, and a first left side reflection surface formed at a left side inclined surface of the light reflection structure, and a first right side reflection surface formed at a right side inclined surface of the light reflection structure; and
a housing in which the 2N image sensors and the light reflecting structure are housed, a second left reflecting surface opposing the first left reflecting surface being formed obliquely to at least a part of a left wall of the housing, a second right reflecting surface opposing the first right reflecting surface being formed obliquely to at least a part of a right wall of the housing, and a light entrance of a light path being formed to at least a part of an upper surface of the housing;
wherein the first left reflecting surface and the first right reflecting surface are curved surfaces.
2. The image sensor package of claim 1 wherein,
the first left reflecting surface is parallel to the second left reflecting surface, and the first right reflecting surface is parallel to the second right reflecting surface.
3. The image sensor package of claim 1 wherein,
n image sensors of the 2N image sensors are arranged at the lower part of the second left reflecting surface, and the rest N image sensors are arranged at the lower part of the second right reflecting surface.
4. The image sensor package of claim 1 wherein,
the image sensor package is closely attached to the lower surface of the display,
the light reflecting structure divides the light passing through the light entrance port into the light directed toward the second left reflecting surface and the light directed toward the second right reflecting surface.
5. The image sensor package of claim 4 wherein,
the detection area of the lower surface of the display is composed of 2N sub-detection areas arranged in a 2×n pattern, and the 2N image sensors respectively correspond to the 2N sub-detection areas.
6. The image sensor package of claim 1 wherein,
the first left side reflective surface and the first right side reflective surface are planar.
7. The image sensor package of claim 6 wherein,
the second left side reflecting surface and the second right side reflecting surface are planar.
8. The image sensor package of claim 6 wherein,
the second left reflecting surface and the second right reflecting surface are formed of N curved surfaces arranged in the horizontal direction.
9. The image sensor package of claim 1 wherein,
the second left side reflecting surface and the second right side reflecting surface are planar.
10. The image sensor package of claim 1 wherein,
the second left reflecting surface and the second right reflecting surface are formed as N concave reflecting surfaces arranged in a horizontal direction.
11. The image sensor package of claim 1 wherein,
the second left side reflecting surface is a single concave reflecting surface curved toward the left wall side, and the second right side reflecting surface is a single concave reflecting surface curved toward the right wall side.
12. The image sensor package of claim 1 wherein,
the image sensor package further includes:
a third left reflecting surface obliquely arranged at the lower part of the second left reflecting surface;
A fourth left reflecting surface which is disposed obliquely opposite to the third left reflecting surface and is spaced apart in the horizontal direction;
a third right reflecting surface obliquely arranged at the lower part of the second right reflecting surface; and
and a fourth right reflecting surface which is disposed obliquely opposite to the third right reflecting surface and is spaced apart in the horizontal direction.
13. The image sensor package of claim 12 wherein,
the housing includes an upper housing and a lower housing,
the upper housing includes the second left side reflective surface and the second right side reflective surface,
the lower housing includes the third left side reflective surface formed on at least a portion of the left wall and the third right side reflective surface formed on at least a portion of the right wall.
14. The image sensor package of claim 12 wherein,
the third left reflecting surface is parallel to the fourth left reflecting surface, and the third right reflecting surface is parallel to the fourth right reflecting surface.
15. The image sensor package of claim 1 wherein,
The image sensor package further includes:
a left light shielding wall extending from the first left reflecting surface to the second left reflecting surface; and
a right light shielding wall extending from the first right reflecting surface toward the second right reflecting surface.
16. The image sensor package of claim 1 wherein,
the image sensor package further includes an optical lens disposed on an upper portion of the 2N image sensors.
17. An image sensor package for implementing a large area detection area, the image sensor package comprising:
a base provided with an image sensor having a predetermined incident angle range and a focal distance larger than a thickness of the image sensor package; and
a unit reflection structure providing a folded light path so that light belonging to the predetermined incident angle range reaches the image sensor disposed at a position closer than the focal distance,
wherein the unit reflection structure comprises:
a first reflection surface obliquely arranged to reflect light incident inside after exiting from the detection area; and
a second reflection surface that is provided obliquely so as to face the first reflection surface, and that reflects light from the first reflection surface toward the image sensor;
The unit reflection structure includes:
a body optically transparent and providing an optical path through which light entering from the light incident surface passes;
the light incidence surface is formed on the upper surface of the body;
the first reflection surface is formed obliquely to the lower part of the light incidence surface so as to face the light incidence surface, and reflects light incident through the light incidence surface;
the second reflecting surface is formed in parallel with the first reflecting surface so as to face the first reflecting surface, and reflects light from the first reflecting surface; and
and a light emitting surface formed on a lower portion of the light incident surface so as to face the second reflecting surface, and configured to emit light from the second reflecting surface toward the image sensor.
18. The image sensor package of claim 17 wherein,
the first reflecting surface is parallel to the second reflecting surface.
19. The image sensor package of claim 17 wherein,
the image sensor package includes a pair of unit reflective structures,
the first reflecting surfaces of the pair of unit reflecting structures are disposed opposite to each other and the light incident surfaces are located on the same plane.
20. The image sensor package of claim 17 wherein,
The image sensor package includes a pair of unit reflective structures,
the side surfaces of the pair of unit reflecting structures connecting the first reflecting surface and the second reflecting surface are disposed opposite to each other and the light incident surfaces are located on the same plane.
21. The image sensor package of claim 17 wherein,
the side surfaces connecting the first reflecting surface and the second reflecting surface are obliquely arranged.
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