KR102424947B1 - Flash module and portable terminal including the same - Google Patents

Abstract

The flash module of the embodiment and the portable terminal including the same include a first light emitting device package and a second light emitting device package disposed adjacent to the first light emitting device package, and the first light emitting device package and the second light emitting device package emit light, respectively It includes a device and a lens disposed on the light emitting device, and the second light emitting device package further includes a diffusion plate disposed on the lens to supply light having a high illuminance value and high light uniformity when used with a camera module. The quality of the captured video can be improved.

Description

FLASH MODULE AND PORTABLE TERMINAL INCLUDING THE SAME

The embodiment relates to a flash module used as an auxiliary light source of a camera and a portable terminal including the same.

As the use of a camera or a portable terminal having a camera increases, the demand for an auxiliary light source such as a flash that helps to take a picture in order to obtain an image of high quality even in a dark place is increasing.

Currently, a flash used in a mobile phone includes an LED (Light Emitting Diode) as a light source, which can be driven with low power and has a long lifespan.

However, in the case of conventional flash lighting, the light emitted from the LED is designed to be delivered directly to the subject, so that the luminous flux is large only at the position corresponding to the position where the LED is arranged on the illuminance surface where the subject is, and the luminous flux is relatively low in the surrounding area. Only the light from the light source was incident, and when the light emitted from the light source reached the subject, it did not have a uniform illuminance at the front of the subject.

In particular, when shooting an image using a camera mounted on a mobile phone, in the case of a flash lamp attached to a mobile phone, the light uniformity is low, and the light is concentrated in a part of the mobile phone, thereby reducing the overall image quality.

For example, when shooting in self-portrait mode using the camera of a portable terminal, light is concentrated on only the face of a person, and the amount of light transmitted to the rest of the area is significantly lower than that of the central area where the face is located, making it difficult to obtain a high-quality image as a whole. There are limits.

The embodiment is a flash module that changes the shape of the lens constituting the light emitting device package or further includes another optical member together with the light emitting device package so that light with high light uniformity and high illuminance can be transmitted on the illuminance surface where the subject is as a whole and a portable terminal including the same.

The embodiment includes a first light emitting device package and a second light emitting device package disposed adjacent to the first light emitting device package, wherein the first light emitting device package and the second light emitting device package include a light emitting device and the light emitting device, respectively It provides a flash module including a lens disposed on the second light emitting device package further comprises a diffusion plate disposed on the lens.

The first light emitting device package or the second light emitting device package may include a lead frame electrically connected to the light emitting device; and a body part for fixing the lead frame; may further include.

The lens may include: a first lens unit disposed on an optical axis of the light emitting device and including an incident surface of light emitted from the light emitting device; and a second lens unit integrally formed with the first lens unit on the first lens unit and including an exit surface of the light incident from the light emitting device; may include.

The first lens unit may include a first incident surface, a second incident surface, and a reflective surface, and the second lens unit may include a first exit surface, a second emission surface, and a side surface connected to the first lens unit. .

The first lens unit may include an incident surface having a Fresnel pattern.

The first incident surface may form a curved surface convex toward the light emitting device, and the second incident surface may extend from the first incident surface to form an inclined surface.

The reflective surface may extend from the second incident surface to form an inclined surface in the direction of the second lens unit.

The reflective surface may be a total internal reflection (TIR) surface.

The first exit surface is disposed to face the first incidence surface, and forms a convex curved surface in a direction opposite to the first incidence surface, and the second exit surface extends from the first exit surface to form an inclined surface. can

The flash module of an embodiment includes at least one light emitting device package among the first light emitting device package and the second light emitting device package, and comprising: a support substrate for fixing the at least one light emitting device package; and a diffusion plate disposed on the at least one light emitting device package. may include

The at least one light emitting device package may be plural, and the plurality of light emitting device packages may be arrayed on the support substrate in a ring shape.

The plurality of light emitting device packages may be selectively driven.

at least one light emitting device package among the first light emitting device package and the second light emitting device package; a support substrate for fixing the at least one light emitting device package; and an optical member disposed on the support substrate. and, the optical member may include a light guide plate.

The optical member may further include at least one of a prism sheet and a diffusion plate.

The light emitting device package may emit light from a side surface.

A reflective layer may be further included on the support substrate.

The flash module of the above-described embodiment may have an angle of view within 45 degrees and a light uniformity of 90% or more.

Another embodiment is a camera module; and the flash module of the above-described embodiment disposed adjacent to the camera module; It provides a portable terminal comprising a.

The flash module and the portable terminal including the same according to the embodiment may improve light uniformity by disposing a lens and an optical member on a light emitting device.

1 is a view showing a portable terminal according to an embodiment;
2 is a view showing a light emitting device package included in a flash module according to an embodiment;
3 is a view showing a cross-section of a light emitting device package according to an embodiment;
4 is an exploded perspective view of a light emitting device package according to an embodiment;
5A to 5B are views showing an embodiment in which an optical field is divided in an illuminance surface;
6A to 6C are diagrams showing optical characteristics simulation results in a flash module;
7 is a view showing the simulation results for the directivity angle characteristics in the flash module including the second light emitting device package,
8A to 8B are sectional views and perspective views, respectively, of a lens of an embodiment;
9 is a view showing a simulation result for a directivity angle characteristic in a flash module according to an embodiment;
10 is a view showing a simulation result of optical characteristics in a flash module according to an embodiment;
11 is a view showing an embodiment in which the flash module of one embodiment is disposed in a portable terminal;
12A is a view showing a case in which the flash module of an embodiment is observed from the front in a driven state;
12B is a view showing the result of observing the flash module in an embodiment at a distance spaced apart from the flash module in a driven state;
13 is a view showing a simulation result of optical characteristics in a flash module according to an embodiment;
14 is a front view and a cross-sectional view of a flash module according to an embodiment, respectively;
15 is a view showing the optical characteristics of one embodiment according to the size of the pattern formed on the light guide plate,
16 is a diagram illustrating a result of observing a state in which the flash module is driven according to an embodiment at a distance spaced apart from the flash module.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention that can specifically realize the above objects will be described with reference to the accompanying drawings.

In the description of the embodiment according to the present invention, in the case where it is described as being formed in "on or under" of each element, above (above) or below (on) or under) includes both elements in which two elements are in direct contact with each other or one or more other elements are disposed between the two elements indirectly. In addition, when expressed as “up (up) or down (on or under)”, the meaning of not only the upward direction but also the downward direction based on one element may be included.

Also, as used hereinafter, relational terms such as “first” and “second”, “upper/upper/above” and “lower/lower/below” refer to any physical or logical relationship or order between such entities or elements. may be used only to distinguish one entity or element from another, without necessarily requiring or implying that

In the drawings, the thickness or size of each layer is exaggerated, omitted, or schematically illustrated for convenience and clarity of description. Also, the size of each component does not fully reflect the actual size.

1 is a diagram illustrating an embodiment of a portable terminal including a flash module according to an embodiment.

FIG. 1 may show a rear surface of a portable terminal 300A according to an embodiment, and the rear surface of the portable terminal may include a camera module 250 and a flash module 200 according to an embodiment disposed adjacent thereto.

The flash module 200 may include a first light emitting device package 210A and a second light emitting device package 210B disposed adjacent to each other.

2 is a diagram illustrating an embodiment of a first light emitting device package 210A and a second light emitting device package 210B.

The first light emitting device package 210A and the second light emitting device package 210B may include a light emitting device 110 and a lens 130A disposed on the light emitting device, respectively.

In addition, the second light emitting device package 210B may further include a diffusion plate 150 on the lens 130A as compared to the first light emitting device package 210A.

That is, the flash module 200 included in FIG. 1 includes a first light emitting device package 210A having a light emitting device 110 and a lens 130A, a light emitting device 110 , a lens 130A, and a diffusion plate 150 . It may include a second light emitting device package 210A configured to include.

The light emitting device 110 may be a light emitting diode.

The light emitting device 110 may be a side view type light emitting diode or a top view type light emitting diode.

The light emitting device included in the flash module according to an embodiment may emit white light.

For example, the light emitting device includes a red phosphor and a green phosphor on a light emitting diode chip that emits light in a blue or ultraviolet wavelength region, or emits light in a blue or ultraviolet wavelength region. White light may be realized by including a yellowish green phosphor on the emitting diode chip.

However, the light emitting device is not limited to the above-described embodiment, and may include a plurality of light emitting device chips emitting light of different wavelength ranges or a phosphor having a light emission wavelength range of a different color in addition to the presented phosphor. may be

Referring back to FIG. 1 , the flash module of one embodiment is illustrated as including a first light emitting device package 210A and a second light emitting device package 210B one by one, but the flash module 200 is the illustrated embodiment It is not limited to, and may be configured to include at least one first light emitting device package 210A and at least one second light emitting device package 210B.

That is, the flash module 210 according to an embodiment may be configured to include a plurality of at least one of the first light emitting device package 210A and the second light emitting device package 210B.

In addition, in the flash module 210 , the light emitting device package 210 may be disposed on a heat sink to transfer heat emitted from the light emitting device to the outside. For example, a heat sink may be disposed on the housing of the portable terminal, and the first light emitting device package and the second light emitting device package may be disposed on the heat sink.

Referring back to FIG. 2 , in the first and second light emitting device packages 210A and 210B, the lens 130A may be disposed to be spaced apart from the light emitting device. Meanwhile, in the second light emitting device package 201B of FIG. 2 , the diffusion plate 150 is illustrated as being spaced apart from the lens 130A and disposed on the lens 130A, but the embodiment is not limited thereto, and the diffusion plate 150 is spaced apart from the lens 130A. It may be disposed in contact with a portion of the upper surface of the lens 130A at 150 .

3 is a cross-sectional view illustrating an embodiment of a light emitting device package included in a flash module according to an embodiment.

For example, FIG. 3 may be a view showing a plane cut in the vertical direction of the first light emitting device package 210A, and in the case of the second light emitting device package 210B, it is on the lens in the configuration shown in FIG. It may correspond to the case of further including a diffusion plate.

Referring to FIG. 3 , the light emitting device package may further include a lead frame 140 electrically connected to the light emitting device 110 and a body portion 170 for fixing the lead frame.

The lead frame 140 may be made of a conductive material such as copper, and may be disposed by plating gold (Au), for example.

The body 170 may be formed of a silicon material, a synthetic resin material, or a metal material, and may be formed of a ceramic material having excellent thermal conductivity.

For example, the upper portion of the body portion 170 is open, the body portion 170 may have a cavity consisting of a side surface and a bottom surface, and as shown in FIG. 3 , a light emitting device 110 on the bottom surface of the package. may be fixedly disposed.

In addition, the body 170 may allow the lens 130A of the light emitting device package to be seated and fixed. That is, referring to region A of FIG. 3 , the lens 130A disposed on the light emitting device may be fixedly coupled to the body 170 at the stepped portion A formed on the side of the lens.

Meanwhile, the lenses included in the first light emitting device package and the second light emitting device package may include a first lens unit 130 - 1 and a second lens unit 130 - 2 .

The lens may be formed of a transparent material that transmits light.

The lens may be formed of, for example, poly styrene (PS), poly carbonate (PC), polymethylmethacrylate (PMMA), or the like.

Referring to the lens 130A shown in FIG. 3 , the first lens unit 130 - 1 is disposed on the optical axis of the light emitting device 110 and includes an incident surface of light emitted from the light emitting device 100 , The second lens unit 130 - 2 may be integrally formed with the first lens unit on the first lens unit and include an emitting surface of light incident from the light emitting device.

The first lens unit 130 - 1 may include a first incident surface 103 - 1a , a second incident surface 130 - 1b , and a reflective surface 130 - 1c , and the second lens unit 130 - 1 . 2) may include a first emitting surface 130-2a, a second emitting surface 130-2b, and side surfaces connected to the first lens unit.

Referring to FIG. 3 , the first incident surface 130 - 1a of the first lens unit may be disposed to face the light emitting device 110 on the optical axis of the light emitting device. The first incident surface 130 - 1a may be a curved surface in which a central portion is convex in the direction of the light emitting device.

In this case, the first incident surface 130 - 1a may be a surface on which light emitted in an angle range of less than 30 degrees with respect to the optical axis, which is the center of the light emitting device 110 , is mainly incident.

The first incident surface 130 - 1a may receive the light emitted from the light emitting device 100 and be condensed to the first emission surface 130 - 2a . In this case, the first exit surface 130 - 2a may be disposed at a position facing the first incidence surface 130 - 1a in the upper direction of the first incidence surface 130 - 1a .

When the area of the first incident surface 130 - 1a of the first lens unit is cut in the horizontal direction, the cut surface may have a circular or elliptical shape. For example, when the horizontal cut surface of the first incident surface has an elliptical shape, the major axis direction may be a horizontal direction of the flash module or a direction corresponding to a horizontal direction of the illuminance surface to be described later.

In comparison, the second incident surface 130 - 1b of the first lens unit may be an incident surface on which light deviating from the optical axis of the light emitting device is incident.

For example, the second incident surface 130 - 1b may be an incident surface on which the light emitted from the light emitting device is deviated by 30 degrees from the optical axis of the light emitting device.

The second incident surface 130-1b may be formed to extend from the first incident surface 130-1a.

The second incident surface 130 - 1b may start from the edge of the first incident surface 130 - 1a and extend to form an oblique surface in the direction of the lower surface of the first lens unit. That is, the second incident surface 130-1b may be formed to be connected to the first incident surface 130-1a to surround it.

Light incident through the second incident surface 130-1b may be transmitted to the reflective surface 130-1c of the first lens unit.

The reflective surface 130-1c is formed to extend from the second incident surface 130-1b, and starts from the edge of the second incident surface 130-1b and is an oblique surface in the direction of the second lens unit 130-2. can be formed by

In this case, the reflective surface 130 - 1c may be a side surface of the first lens unit 130 - 1 .

Meanwhile, the inclined surface of the reflective surface 130-1c may be formed to face the inclined surface of the second incident surface 130-1b.

The reflective surface 130 - 1c may be a total internal reflection (TIR) surface.

By making the reflective surface 130-1c a TIR surface, the light incident on the lens 130A is prevented from being lost to the outside from the surface other than the emission surface, so that the light incident from the light emitting device is transmitted toward the light emission surface. By doing so, the light efficiency can be improved.

The light incident through the second incident surface 130 - 1b may be totally reflected by the reflective surface 130 - 1c and transmitted in the direction of the second lens unit 103 - 2 .

The light reflected from the reflective surface 130-1c may be emitted to the first emission surface 130-2a or the second emission surface 130-2b.

The second lens unit 130-2 may include a first emission surface 130-2a and a second emission surface 130-2b.

The first exit surface 130 - 2a may allow light incident from the first incidence surface 130 - 1a or the reflective surface 130 - 1c of the first lens unit to be uniformly dispersed.

The first emission surface 130 - 2a may be formed to have a convex curved surface in the light emission direction.

That is, the first exit surface 130-2a may be disposed to face the first incidence surface 130-1a of the first lens unit, and may form a convex curved surface in a direction opposite to the first incidence surface.

The second exit surface 130-2b may be formed to extend from the first exit surface 130-2a.

The second exit surface 130 - 2b may be an inclined surface extending from the edge of the first exit surface 130 - 2a and formed in an upper direction of the second lens unit 130 - 2 .

The second emitting surface 130 - 2b may emit light reflected and transmitted from the reflective surface 130 - 1c of the first lens unit. The second emitting surface 130 - 2b may be formed as an inclined surface so that light transmitted from the reflective surface 130 - 1c may be uniformly distributed.

Meanwhile, an edge of the second exit surface 130 - 2b may have a flat upper surface without inclination.

Also, for example, the height of the portion most protruding from the first emission surface 130-2a may be disposed at the same height as the edge of the second emission surface 130-2b.

Also, for example, when a diffusion plate is further included in the light emitting device package embodiment of FIG. 3 , the diffusion plate may be disposed on the second lens unit 130 - 2 .

The diffusion plate may be disposed in contact with or spaced apart from the edge of the second exit surface 130 - 2b of the second lens unit.

4 is an exploded perspective view of a light emitting device package according to an embodiment.

For example, the perspective view shown in FIG. 4 may be a perspective view of the light emitting device package of the embodiment of FIG. 3 .

In addition, in the embodiment of FIG. 4 , a reflective layer may be further included on the upper surface of the body portion 170 , that is, the upper surface of the body portion 170 facing the lens 130 or the inner surface of the body portion.

When a reflective coating or a reflective layer is included on the upper surface or the inner surface of the body, the light efficiency transmitted from the light emitting device 110 to the lens 130 may be improved.

5A shows the flash module 200 and the illuminance surface 500 on which light emitted from the flash module arrives.

In this case, the illuminance surface 500 may be located at a distance d from the flash module 200 . For example, the illuminance surface 500 may be located at a distance of 1 m from the flash module 200 . That is, the target distance of the flash module may be a distance 1m apart from the light source.

In addition, a field of view (FOV) of light emitted from the flash module may be θ.

An arrow indicated by “C” in FIG. 5A may be an optical axis of light emitted from the flash module, which may pass through the center of the illuminance surface 500 .

FIG. 5B is a view showing the roughness surface 500 of FIG. 5A in more detail.

Referring to FIG. 5B , in order to determine the uniformity of light according to the location of the illuminance surface on the illuminance surface to which the light emitted from the flash module arrives, the illuminance surface to which the light arrives is set to an optical field of 0.1F to 1.0F as in FIG. 5b . can be distinguished.

In addition, the ratio of the horizontal (Wx) to the vertical (Wy) of the roughness surface may be 4:3 or 16:9. For example, the roughness surface may have a width (Wx) of 1200 mm and a length (Wy) of 800 mm.

Referring to FIG. 5B , the roughness surface may be divided into 10 optical fields.

The ten optical fields can be between 0.1F and 1.0F. Here, the circle dividing the optical field may be a concentric circle with the center of the screen as the center of the circle.

1.0F may be a point on the circumference of a circle drawn adjacent to the outermost edge of the screen with the center of the screen as the center of the circle.

In addition, the horizontal direction, the vertical direction, and the diagonal direction on the roughness plane may correspond to the X, Y, and D axes, respectively.

6A to 6C are diagrams illustrating simulation results of illuminance characteristics according to the shape of a flash module. 6A to 6C , the row direction corresponds to the horizontal direction of the illuminance surface, the column direction corresponds to the vertical direction of the illuminance surface, and diagonally adjacent cells correspond to the diagonal direction of the illuminance surface.

That is, referring again to FIG. 5B , cells may be adjacent to each other in an X-axis direction for a row, a Y-axis for a column, and diagonally adjacent cells in a D-axis direction.

In addition, the values shown in the table are the illuminance and light uniformity values in the horizontal direction in the row direction, the illuminance and light uniformity values in the vertical direction of the illuminance surface in the column direction, and the values shown in the diagonal direction are the diagonal of the illuminance surface. It corresponds to the illuminance value and the light uniformity value in the area.

In each diagram, “center” corresponds to a center point through which the optical axis of the light emitting element passes, and 0.3F, 0.5F, 0.7F, and 1.0F correspond to the optical field shown in FIG. 5B .

In this case, the field of view (FOV) of the light source used for the simulation may be 75 degrees.

Meanwhile, an area from the center to 0.5F, which is an area indicated by a dotted line in the diagram of FIGS. 6A to 6C , may have an FOV of 45 degrees.

That is, for example, when the flash module of one embodiment is used as an auxiliary light source for a portable terminal such as a mobile phone, when taking an image using the self-photography mode, the entire subject can be covered with the flash light having an FOV of 45 degrees, An optical characteristic value in an area separated by a dotted line in FIGS. 6A to 6C may be an optical characteristic value of a flash module that can be used in a self-photography mode.

In addition, in the diagram, “Lux” is the illuminance value in each optical field region, and the value indicated by “%” corresponds to the light uniformity in each optical field region with respect to the “center” region.

6A is a diagram showing optical characteristics of a flash module including only a first light emitting device package, FIG. 6B is a diagram showing optical characteristics of a flash module including only a second light emitting device package, and FIG. 6C is a first light emitting device package and a second light emitting device package It is a table showing the optical characteristics of the flash module of an embodiment including all of the light emitting device packages.

In the case of FIG. 6A , the illuminance value at 1.0F in the diagonal direction of the illuminance surface is 50.8Lux, and the light uniformity is 26%, indicating that the light uniformity is very small compared to the center of the illuminance surface.

In addition, referring to 6b, the illuminance value at 1.0F in the diagonal direction of the illuminance surface is 48.9Lux, and the light uniformity corresponds to 84%, indicating that the light uniformity is improved compared to the case of FIG. 6a.

That is, in the case of FIG. 6B , since the second light emitting device package has a configuration in which a diffusion plate is further disposed on the lens, it can be seen that the light uniformity is improved even outside the illuminance surface compared to the flash module using the first light emitting device package. However, referring to the diagram of FIG. 6B , although the light uniformity is improved, the illuminance value is as low as 58.4 lux even at the center of the illuminance surface, indicating that the overall brightness on the illuminance surface is reduced.

In Fig. 6c, compared with Figs. 6a to 6b, the illuminance value at 1.0F in the diagonal direction of the illuminance surface is 119.8Lux and the light uniformity is 46%, compared to the case of using only the first light emitting device package, the light uniformity is improved. The results are shown. In addition, compared to the case of FIG. 6B using only the second light emitting device package, an overall higher illuminance value was exhibited.

Accordingly, in the case of the flash module according to an exemplary embodiment, by using the second light emitting device package having the light diffusion effect together with the first light emitting device package, the light uniformity may be improved while maintaining the luminance in terms of illuminance.

In addition, in the region between “center” and “0.5F” where the FOV is 45 degrees, in the case of FIG. 6c including the flash module of the embodiment, the light uniformity is 73% or more uniformly as a whole. By comparison, it can be seen that the optical properties are improved.

7 is a view illustrating a light beam angle of a second light emitting device package including a diffusion plate.

In the drawing, A shows the distribution of the beam angle in the vertical direction on the illuminance plane of FIG. 5B , B shows the beam distribution in the diagonal direction on the illuminance plane, and C shows the beam distribution in the left and right directions on the illuminance plane.

That is, in general, considering the horizontal and vertical ratios in the image taken by the camera, since the horizontal width is generally larger, in the case of the diffusion plate included in the second light emitting device package, in order to have light uniformity in the wide horizontal width, As shown in FIG. 7 , it may be designed so that the directional angle in the horizontal direction is more widely distributed.

For example, as the light emitted from the flash module including the second light emitting device package further including a diffusion plate changes from the vertical direction to the horizontal direction of the illuminance surface, the range of the beam angle of the light emitted from the flash module is widened. The light uniformity may be improved even in the illuminance plane in the horizontal direction having a relatively larger ratio than in the vertical direction.

A flash module of another embodiment includes a light emitting device and a lens disposed on the light emitting device, and the lens includes a first lens unit having a Fresnel pattern and a second lens unit integrally formed with the first lens unit of the Fresnel pattern. can

8A to 8B are diagrams illustrating an embodiment of a lens included in a flash module according to an embodiment.

8A is a cross-sectional view of the lens 130B according to an embodiment, and FIG. 8B may be a perspective view of the lens 130B according to an embodiment.

Referring to FIGS. 8A to 8B , the lens 130B according to an exemplary embodiment is formed on the first lens unit 130-1 and the first lens unit 130-1 in which a Fresnel pattern is formed on a surface disposed to face the light emitting element. It may include a second lens unit 130 - 2 integrally formed with the first lens unit 130 - 1 .

The surface on which the Fresnel pattern is formed may be an incident surface on which light emitted from the light emitting device is incident.

Due to the incident surface of the lens having the Fresnel pattern, the light incident from the light emitting device to the lens can be uniformly dispersed throughout the lens, and thus the light emitted through the lens is also uniformly dispersed on the exit surface to reach the light. Light uniformity may be improved in terms of illuminance.

Referring to FIGS. 8A to 8B , a protrusion 132 protruding outward from the side of the first lens unit 130-1a on which the Fresnel pattern is formed may be included at the edge of the first lens unit 130-1a.

That is, when the lens 130B is included in the light emitting device package, the protrusion 132 formed on the lens may be a coupling portion for coupling with other components. For example, when the light emitting device package according to an embodiment includes a body portion, the protrusion 132 of the lens may be a portion to be seated on the body portion.

Also, referring to FIGS. 8A to 8B , the lens 130B according to an exemplary embodiment may include a leg portion 135 . For example, when the light emitting device package includes the lens 130B according to an embodiment, the leg portion 135 may be a coupling portion for fixing the lens 130B to the light emitting device package.

Referring to FIGS. 8A to 8B , in the lens 130B according to an exemplary embodiment, the second lens unit 130-2 is shown to have a cylindrical shape, but the second lens unit 130-2 is described above. It may have a shape having the same exit surface as in the lens 130A of the embodiment shown in FIG. 3 .

9 is a diagram illustrating optical characteristics for a flash module of one embodiment including the lens of FIGS. 8A-8B .

9 shows the illuminance value and light uniformity in each optical field when the illuminance surface is divided into optical fields as in FIGS. 6A to 6C.

Illuminance at 1.0F may be 100.6 Lux, and light uniformity may be 61%.

In addition, it can be seen that the illuminance becomes 150Lux or more in the 0.5F region at the center divided by the dotted line, and the light uniformity is 92% or more.

That is, in the case of the flash module of the embodiment including the Fresnel pattern in the first lens part, the light incident from the light emitting device package can be diffused by the lens while minimizing the light loss by the Fresnel pattern, so that a separate diffusion plate Even when it does not further include a light having a high uniformity in terms of illuminance can be obtained.

Therefore, when the camera module and the flash module of the embodiment are used together, high-luminance and uniform light can be supplied to the subject, so that a high-quality image can be obtained.

In particular, in the case where the camera module and the flash module are used in a portable terminal, etc., in the self-camera mode, etc., in which the user takes a picture of himself/herself, the FOV (angle of view) can cover the entire subject by about 45 degrees. For reference, the average value of the overall light uniformity in the illuminance plane corresponding to 0.5F at the center where the subject is located can satisfy 100%.

FIG. 10 is a diagram illustrating the distribution of beam angles of light emitted from the flash module according to an embodiment including the lens shown in FIGS. 8A to 8B .

In FIG. 10, A may correspond to the vertical direction on the above-described illuminance surface, and B may correspond to the left and right directions of the illuminance surface.

Referring to FIG. 10 , it can be seen that in the case of a flash module including a lens having a first lens unit having a Fresnel pattern, the distribution of the orientation angles in the vertical direction and the left and right directions are similar due to the effect of the Fresnel pattern. can

11 is a diagram illustrating a portable terminal 300B including a flash module according to an embodiment.

11 may be a rear view of the portable terminal 300B according to an embodiment.

The portable terminal 300B may include a camera module 250 and a flash module 200 having a ring shape.

In the flash module 200 of an embodiment, a plurality of light emitting device packages 210 are arranged in a ring shape with the camera module 250 as a center, and a diffusion plate ( 230) may be arranged.

The diffusion plate 230 may be disposed on the entire upper surface on which the flash module is disposed.

The plurality of light emitting device packages 210 included in the flash module 200 according to an embodiment may include at least one of the first light emitting device package 210A and the second light emitting device package 210B.

The plurality of light emitting device packages 210 included in the flash module 200 according to an embodiment may be selectively driven.

For example, the flash module may further include a circuit unit (not shown) for controlling driving of each of the plurality of light emitting device packages 210 to selectively drive the plurality of light emitting device packages.

That is, the flash module can be controlled to be selectively driven according to the luminance value of the required light source.

12A to 12B are diagrams illustrating optical characteristics of light emitted from the flash module of the embodiment shown in FIG. 11 .

12A shows the distribution of light on the flash module when light is emitted from the flash module.

Referring to the scale bar on the right in FIG. 12A , it can be seen that bright regions with high illuminance are arranged in a ring shape.

That is, in the case of the flash module of the embodiment of FIG. 11 , it can be seen that the light emitted as shown in FIG. 12A also exhibits a ring shape as the light emitting device packages are arranged in a ring shape around the camera module disposed in the center.

FIG. 12B is a view illustrating light emitted from the flash module of FIG. 11 at a distance of 1 m apart.

Although the light emitting device packagers are arranged to be spaced apart in a ring shape in FIG. 11 , it can be seen that the center of the illuminance surface is bright at a distance of 1 m and the illuminance value partially decreases toward the edge.

That is, in the flash module of an embodiment, by arranging a light emitting device package that is a light source to surround the camera module, high luminance can be obtained as a whole by a plurality of light sources, and the central region of the illuminance plane is relatively bright in the illuminance plane where the light arrives. Since light can be obtained, it can be exposed to relatively bright light when the camera module operates, so that a high-quality image can be obtained. In addition, by including the diffusion plate on the front surface of the flash module, it is possible to improve the hot spot phenomenon in which light is concentrated only from the light source in the illuminance plane.

FIG. 13 is a table showing simulation results of optical characteristics for the flash module embodiment of FIG. 11 described above.

Referring to the results of FIG. 13 , it can be seen that by including a plurality of light emitting device packages, the illuminance of the flash module is as high as 437.5Lux even at 1.0F, and the light uniformity is high as 59% by including the diffuser plate in the flash module. have.

In addition, in the area from the center to 0.5F, the light uniformity is more than 87%, so that when used in a portable terminal such as a camera module, a high-quality image can be obtained in the self-photography mode.

14 is a diagram illustrating a flash module according to another embodiment.

The flash module according to an embodiment may include a light emitting device package 210, a support substrate (not shown) for fixing the light emitting device package, and an optical member 240 disposed on the support substrate.

In this case, in the embodiment of FIG. 14 , the light emitting device package 210 may include a side emission type light emitting device.

Referring to FIG. 14 , light emitted from the side surface of the light emitting device package 210 may be transmitted to the optical member 240 disposed on a path along which light emitted from the light emitting device travels.

The optical member 240 may include a reflection plate 241 , a light guide plate 243 , a diffusion plate 245 , and prism sheets 247a and 247b .

Light emitted from the light emitting device package 210 is incident on the light guide plate 243 , and the light may be transmitted to a distance spaced apart from the light emitting device package 210 according to a pattern formed on the light guide plate 243 , and also the light guide plate 243 . ), the light path is changed to transmit light to the upper surface of the flash module.

In this case, the light transmitted from the light guide plate 243 may be incident on the diffusion plate 245 to uniformly distribute the light emitted from the light emitting device package 210 .

In addition, by arranging the prism sheets 247a and 247b on the diffusion plate 245 , light extraction efficiency can be improved, thereby improving the luminance of the flash module.

In this case, the prism sheet may include a lower prism sheet 247a and an upper prism sheet 247b.

Although not shown in the drawings, the flash module may be fixedly disposed on the support substrate. For example, the support substrate for fixing the light emitting device package 210 and the optical member 240 may be mounted on the housing of the portable terminal.

In addition, in order to protect the flash module as a whole, a cover film 249 covering all areas including the light emitting device package 210 and the optical member 240 may be included.

The cover film 249 may be formed of a transparent polymer resin or may be disposed in the form of a thin glass film (cover glass).

A dot pattern for transmitting light incident from the light emitting device package 210 may be formed on the light guide plate 243 .

Tables 1 to 15 show illuminance values and light uniformity according to sizes of dot patterns formed on the light guide plate. For example, Table 1 shows the illuminance values in the optical field separated from the illuminance surface reached by the light emitted from the flash module.

division Dot pattern size (Φ) Illuminance according to the optical field (Lux) 0F 0.7F 1.0F Example 1 0.2 95 39 24 Example 2 0.15 130 59 11 Example 3 0.10 203 46 20 Example 4 0.05 167 78 16 Example 5 0.01 112 90 64

Table 1 shows the illuminance values of the flash module according to the dot pattern size of the light guide plate when the field of view (FOV) of the flash module is 75 degrees and the illuminance value at the illuminance surface spaced 1 m apart from the flash module.

The size Φ of the dot pattern formed on the light guide plate in Examples 1 to 5 may be 0.2 mm, 0.15 mm, 0.10 mm, 0.05 mm, and 0.01 mm, respectively.

15 is a graph showing the contents disclosed in Table 1, and shows the illuminance (Lux) and light uniformity (Uniformity) in the illuminance surface at a distance of 1 m according to the pattern size of the light guide plate.

Referring to Tables 1 to 15, it can be seen that the light uniformity in the illuminance surface tends to increase as the size of the dot pattern formed on the light guide plate decreases.

In addition, it can be seen that in the case of Example 5, in which the size of the dot pattern is the smallest, the illuminance values at 0.7F and 1.0F are relatively larger in the illuminance value.

For example, it can be seen that when the size of the dot pattern of the light guide plate is smaller than 0.05 mm, the light uniformity is 50% or more.

That is, the light incident from the light emitting device package is transmitted to an area spaced apart from the light emitting device package on the opposite side along the dot pattern patterned on the light guide plate, and the light movement direction is changed back to the upper surface of the flash module by the light guide plate. , and then, the light uniformity and light extraction efficiency are improved while passing through the laminated diffusion plate and the prism sheet, so that the light characteristics such as illuminance and light uniformity of the flash module can be finally improved.

Meanwhile, in the above-described embodiment, the case where the size of the dot pattern included in the light guide plate is constant has been described, but dot patterns having different sizes may be included at the same time, and the arrangement area in the light guide plate is different according to the size of the pattern. can be formed by

The flash module of the above-described embodiment includes the light guide plate 243 as the optical member 240 to convert light emitted from the light emitting device package 210, which is a point light source, into a planar light source.

16 is a diagram illustrating a form in which light emitted from a flash module according to an embodiment is observed from an illuminance plane at a distance of 1 m from the flash module.

Referring to FIG. 16 , by having the highest illuminance value in the central region, when the camera module is positioned in the middle of the flash module, it is possible to take pictures under bright illuminance conditions, thereby obtaining an image of excellent quality.

Meanwhile, the flash module of the above-described embodiments may have a light uniformity of 90% or more when a field of view (FOV) from which light is emitted is within 45 degrees.

Another embodiment may be a portable terminal including the above-described embodiment of the flash module.

The portable terminal may include a camera module and the flash module of the above-described embodiments disposed adjacent to the camera module.

In the case of the portable terminal of one embodiment, by including the flash module of the embodiment as an auxiliary light source together with the camera module, it is possible to obtain bright and excellent light uniformity in the illuminance that the flash light reaches, so that high-quality light can be obtained even using the portable terminal. image can be obtained.

In particular, in the case of a portable terminal, since the self-photography mode is often used using a camera module, an improved light uniformity value of 95% or more over the entire area can be obtained in the range of the angle of view performed in the self-photography mode.

In the above, the embodiment has been mainly described, but this is only an example and does not limit the present invention, and those of ordinary skill in the art to which the present invention pertains are not exemplified above in the range that does not depart from the essential characteristics of the present embodiment. It can be seen that various modifications and applications are possible. For example, each component specifically shown in the embodiment can be implemented by modification. And differences related to such modifications and applications should be construed as being included in the scope of the present invention defined in the appended claims.

110: light emitting element 130, 130A, 130B: lens
200: flash module
210, 210A, 210B: light emitting device package
250: camera module
300A, 300B: portable terminal

Claims (18)

a first light emitting device package and a second light emitting device package disposed adjacent to the first light emitting device package;
a support substrate for fixing the first light emitting device package and the second light emitting device package; and
Including an optical member disposed on the support substrate,
Each of the first light emitting device package and the second light emitting device package,
light emitting element;
a lead frame electrically connected to the light emitting device;
a body part for fixing the lead frame; and
It includes a lens disposed on the light emitting device in combination with the body portion in the stepped portion formed on one side,
The second light emitting device package further includes a diffuser plate disposed on the lens, designed so that the directional angle in the horizontal direction is more widely distributed,
The lens is
a first lens unit disposed on the optical axis of the light emitting device and having a Fresnel pattern formed on an incident surface of the light emitted from the light emitting device; and
and a cylindrical second lens unit formed integrally with the first lens unit on the first lens unit and including an exit surface of the light incident from the light emitting device;
The first light emitting device package and the second light emitting device package are arrayed on the support substrate in a ring shape. delete delete The method of claim 1, wherein the first lens unit comprises a first incident surface, a second incident surface, and a reflective surface,
The second lens unit flash module including a first emission surface, a second emission surface, and a side surface connected to the first lens unit. delete According to claim 4, wherein the first incident surface forms a convex curved surface in the direction of the light emitting device,
and the second incident surface extends from the first incident surface to form an inclined surface. The method of claim 4, wherein the reflective surface extends from the second incident surface to form an inclined surface in the direction of the second lens unit,
The height of the reflective surface is lower than the step portion of the lens flash module. 5. The flash module of claim 4, wherein the reflective surface is a total internal reflection (TIR) surface. The method of claim 6, wherein the first exit surface is disposed to face the first incidence surface, and forms a convex curved surface in a direction opposite to the first incidence surface,
The second exit surface extends from the first exit surface to form an inclined surface,
The side surface of the flash module to form a stepped portion coupled to the body portion. delete delete The flash module of claim 1 , wherein the plurality of light emitting device packages are selectively driven. The method of claim 1,
The optical member is a flash module including a light guide plate. The flash module of claim 13 , wherein the optical member further comprises a prism sheet. The flash module of claim 13 , wherein the light emitting device package emits light from a side surface. The flash module of claim 13 , further comprising a reflective layer on the support substrate. The method according to any one of claims 1, 4, 6 to 9, and 12 to 16, wherein the angle of view is within 45 degrees,
Flash module with over 90% light uniformity. camera module; and
a flash module according to claim 17 disposed adjacent to the camera module; A portable terminal comprising a.

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