TWI503581B - Lens, light source device and direct type light source module - Google Patents

Description

Lens, light source device and direct light source module

The present invention relates to an optical component, an optical device, and an optical module, and more particularly to a lens, a light source device, and a direct type light source module.

With the advancement of optical technology, more and more illumination patterns that can be provided by light source devices have been developed. For a light-emitting element (such as a light-emitting wafer or a wick) in a light source device, the change in the illumination light shape itself can be provided. In order to provide more possibilities for light shape, a technique of arranging various appropriately shaped lenses on the light-emitting path of the light-emitting element to provide an appropriate light shape has become a research and development focus in the field of illumination.

In recent years, with the improvement of the luminous efficiency and life of the Light Emitting Diode (LED), coupled with low energy consumption, low pollution, high efficiency, high reaction speed, small size, light weight and various surfaces With the features and advantages of components, LEDs have also been actively used in various optical fields. In general, the light-emitting diode can be applied to various types of lighting devices in daily life as well as light sources of various flat-panel displays such as liquid crystal displays (LCDs).

Taking the application of the light-emitting diode in the field of liquid crystal display as an example, the backlight module of the liquid crystal display belongs to a surface light source. In detail, the backlight module may include at least some of opticals such as a light source, a light guide plate, a diffuser, a diffuser, a prism sheet, a reflector, and the like. The basic principle of the component is to convert the effective light of the line source or point source used into a high-brightness and uniform surface light source. Generally speaking, depending on the position of the light source, the light source module can be further divided into a side incident type and a direct type, wherein the direct type backlight module has a simple structure and can be used in many cases. The light source is set to provide high brightness and brightness, so it is often used in electronic products of large-size liquid crystal displays. Since the light-emitting diode has the characteristics of small volume, long life and low energy consumption, the application of the light-emitting diode to the backlight module can effectively improve the system performance of the backlight module.

However, since the light emitting diode is a light source having directivity, the direct light area in front of the light emitting diode light source generally has a higher brightness, and the brightness of the non-light direct area is lower than the light direct light area. . Therefore, when the light-emitting diode light source is applied to the backlight module, it may affect the uniform brightness in the effective illumination area, thereby affecting the picture quality of the display.

The present invention provides a lens that increases the divergence angle of the light source.

The present invention provides a light source device having a large light divergence angle.

The invention provides a direct type light source module, which can provide a uniform surface light source.

A lens according to an embodiment of the invention includes a light incident surface, a total reflection curved surface, and a light convex surface. The light incident surface includes a sub-curved convex surface, the total reflection curved surface is opposite to the light incident surface, and the light convex surface is connected to the light surface and the total reflection curved surface.

A light source device according to an embodiment of the present invention includes the above lens and a light emitting element. The illuminating element emits a light beam, wherein the light beam enters the lens via the light incident surface.

A direct type light source module according to an embodiment of the present invention includes a plurality of the above-described light source devices and a diffusion plate. The diffusion plate is disposed on a transmission path of a light beam from the light source device, wherein the light source devices are distributed on one side of the diffusion plate.

In an embodiment of the invention, the light incident surface further includes a sub-annular concave surface surrounding the sub-curved convex surface.

In an embodiment of the invention, the light incident surface further includes a sub-concave surface, the sub-curved convex surface is annular and surrounds the sub-concave surface, and the sub-curved convex surface connects the sub-concave surface and the sub-annular concave surface.

In an embodiment of the invention, the sub-annular concave surface includes an outer ring portion and an inner ring portion. The outer ring portion faces away from the light convex surface. The inner ring portion faces away from the total reflection curved surface and connects the outer ring portion and the sub-bend convex surface.

In an embodiment of the invention, the ratio of the distance from the edge of the light incident surface to the optical axis of the lens to the distance from the bottom of the subannular concave surface to the optical axis of the lens falls within the range of 1.1 to 1.5.

In an embodiment of the invention, the lens further includes an optical axis, wherein the lens is axisymmetric with respect to the optical axis.

In an embodiment of the invention, the total reflection curved surface forms a depression, and the inclination angle of the total reflection curved surface with respect to the optical axis increases from near the optical axis to away from the optical axis.

In an embodiment of the invention, a first sub-beam of the light beam sequentially penetrates into the light surface, is totally reflected by the total reflection surface, and penetrates the light convex surface, and a second sub-beam of the light beam sequentially penetrates The light incident surface is reflected by the light convex surface and penetrates the total reflection curved surface, and the light flux of the first sub beam from the light exiting convex surface is greater than the light flux of the second sub beam emitted from the total reflection curved surface.

In an embodiment of the present invention, a third sub-beam of the sub-curved convex beam sequentially penetrates the sub-curved convex surface, is totally reflected by the total reflection surface, is reflected by the light-emitting convex surface, is reflected by the inner ring portion, and penetrates completely The curved surface is reflected, and the second sub-beam from the light-emitting element sequentially penetrates the outer ring portion, is reflected by the light-emitting convex surface, and penetrates the total reflection curved surface.

In an embodiment of the invention, the light-emitting element is disposed on an optical axis.

Based on the above, the light source device of the embodiment of the present invention can illuminate the light source device to the side and the side by the arrangement of the lens, thereby having a large light divergence angle and achieving a relatively uniform overall light energy distribution. Further, the direct type light source module of the embodiment of the present invention can also provide a uniform surface light source by the configuration of a plurality of light source devices.

The above described features and advantages of the invention will be apparent from the following description.

60‧‧‧ Beam

61‧‧‧First sub-beam

63‧‧‧Second sub-beam

65‧‧‧ Third sub-beam

100,400‧‧‧ lens

110, 410‧‧‧ into the glossy surface

111‧‧‧Sub-concave

113‧‧‧Child curved convex

115‧‧‧Sub-annular concave surface

115a‧‧‧Outer Rings

115b‧‧‧ Inner Ring Department

120‧‧‧ total reflection surface

130‧‧‧Light convex

200, 500‧‧‧ light source device

210‧‧‧Lighting elements

300‧‧‧Direct light source module

310‧‧‧Reflection unit

320‧‧‧Diffuser

330‧‧‧Optical diaphragm

415‧‧‧Sub-ring plane

S1‧‧‧ accommodating space

O‧‧‧ optical axis

α, β, θ1, θ2, γ1, γ2, γ3‧‧‧ angle

d, D‧‧‧ distance

FIG. 1 is a schematic structural diagram of a direct type light source module according to an embodiment of the invention.

2 is a schematic cross-sectional view of a light source device of FIG. 1.

3A is a light trace of the light source device of FIG. 2.

Fig. 3B is a light distribution diagram of the light source device of Fig. 2;

Fig. 3C is a view showing optical simulation data of the luminous intensity of the light source device of Fig. 2;

4 is a cross-sectional view showing a light source device according to another embodiment of the present invention.

Fig. 5A is a light trace of the light source device of Fig. 4.

Fig. 5B is a light distribution diagram of the light source device of Fig. 4.

Fig. 5C is a view showing optical simulation data of the luminous intensity of the light source device of Fig. 4.

FIG. 1 is a schematic structural diagram of a direct type light source module according to an embodiment of the invention. 2 is a schematic cross-sectional view of a light source device of FIG. 1. 3A is a light trace of the light source device of FIG. 2. Referring to FIG. 1 and FIG. 2 , in the embodiment, the direct type light source module 300 includes a plurality of light source devices 200 . Specifically, in the embodiment, each light source device 200 includes a lens 100 and a light emitting element 210. In addition, the light-emitting element 210 of the present embodiment is, for example, a light-emitting diode, but the invention is not limited thereto.

In detail, in the embodiment, the lens 100 includes a light incident surface 110, a total reflection curved surface 120, and a light exit convex surface 130. Specifically, as shown in FIG. 2, the light incident surface 110 includes a sub-concave surface 111, a sub-curved convex surface 113, and a sub-annular concave surface. Face 115. The sub-annular concave surface 115 surrounds the sub-curved convex surface 113, and the sub-curved convex surface 113 connects the sub-concave surface 111 and the sub-annular concave surface 115. In more detail, the sub-annular concave surface 115 includes an outer ring portion 115a and an inner ring portion 115b. The outer ring portion 115a faces away from the light convex surface 130. The inner ring portion 115b faces away from the total reflection curved surface 120, and connects the outer ring portion 115a and the sub-bend convex surface 113.

On the other hand, the total reflection curved surface 120 is opposite to the light incident surface 110 and forms a depression. In addition, the light-emitting convex surface 130 is connected to the light surface 110 and the total reflection curved surface 120. In this embodiment, the angle α between the light-convex convex surface 130 and the light-incident surface 110 is, for example, in the range of 75 degrees to 85 degrees, and the angle between the light-convex surface 130 and the total reflection curved surface 120 is β. For example, it falls within the range of 80 to 90 degrees. It should be noted that the numerical ranges of the angles herein are for illustrative purposes only and are not intended to limit the invention.

In addition, in the embodiment, the lens 100 further includes an optical axis O, wherein the lens 100 is axisymmetric with respect to the optical axis O, and the light emitting element 210 is disposed on the optical axis O. In more detail, in the present embodiment, the tilt angle of the total reflection curved surface 120 of the lens 100 with respect to the optical axis O is increased from near the optical axis O to away from the optical axis O. For example, as shown in FIG. 2, the inclination angle θ1 of the total reflection curved surface 120 with respect to the optical axis O near the optical axis O is smaller than the inclination angle θ2 of the total reflection curved surface 120 with respect to the optical axis O away from the optical axis O. Further, in the present embodiment, the ratio of the distance D from the edge of the light-incident surface 110 to the optical axis O of the lens 100 to the distance d from the bottom of the sub-annular concave surface 115 to the optical axis O of the lens 100 falls between 1.1 and 1.5. In the range. It should be noted that the numerical ranges herein are for illustrative purposes only and are not intended to limit the invention.

Further, in the present embodiment, when the light emitting element 210 emits light, the light emitting element 210 can emit a light beam 60. In the present embodiment, since the light-emitting element 210 has directivity, the light beam 60 enters the lens 100 upward and further via the light-incident surface 110. More specifically, in the present embodiment, the light beam 60 includes a first sub-beam 61, a second sub-beam 63, and a third sub-beam 65 incident on the lens 100 at different angles, wherein the first sub-beam 61 The angle between the second sub-beam 63 and the third sub-beam 65 and the optical axis O is γ1, γ2, and γ3, respectively, and γ3 is between γ1 and γ2. In other words, in the present embodiment, since the first sub-beam 61, the second sub-beam 63, and the third sub-beam 65 are incident on the lens 100 at different angles, after passing through the reflection and refraction inside the lens 100, the first sub- Beam 61, second sub-beam 63, and third sub-beam 65 will also be emitted from different portions of lens 100.

Furthermore, as shown in FIG. 2 and FIG. 3A, after the first sub-beam 61 having a small angle with the optical axis O enters the lens 100 via the light-incident surface 110, it can be diffused and according to optical refraction and The principle of reflection, which penetrates into the light surface 110 in sequence, is totally reflected by the total reflection surface 120 and penetrates the light convex surface 130. That is to say, the light source device 200 can cause the first sub-beam 61 to be emitted toward the side of the light source device 200 by the arrangement of the lens 100, thereby increasing the divergence angle of the light beam 60.

On the other hand, as shown in FIG. 2 and FIG. 3A, the second sub-beam 63 having a larger angle with the optical axis O can enter the lens 100 via the outer ring portion 115a of the sub-annular concave surface 115 of the light incident surface 110. The outer ring portion 115a of the sub-annular concave surface 115 of the light-incident surface 110 is sequentially penetrated and reflected by the light-emitting convex surface 130 and penetrates the total reflection curved surface 120. In addition, the third sub-beam 65 enters the lens 100 via the sub-bend convex surface 113 of the light incident surface 110. Then, the sub-curved convex surface 113 of the light-incident surface 110 may be sequentially penetrated, totally reflected by the total reflection curved surface 120, reflected by the light-emitting convex surface 130, and reflected and worn by the inner ring portion 115b of the sub-annular concave surface 115 of the light-incident surface 110. The total reflection surface 120 is transmitted through. In other words, the second sub-beam 63 and the third sub-beam 65 are emitted toward the upper side of the light source device 200 via the total reflection curved surface 120 opposite to the light incident surface 110.

In this way, by the arrangement of the lens 100, the light source device 200 can emit light not only to the side by the first sub-beam 61 but also to the upper side by the second sub-beam 63 and the third sub-beam 65. In addition, as shown in FIG. 3A, in the present embodiment, the luminous flux of the first sub-beam 61 emerging from the light-emitting convex surface 130 is greater than the luminous flux of the second sub-light beam 63 from the total reflection curved surface 120, and the first sub-beam The luminous flux of the beam 61 is also greater than the luminous flux of the third sub-beam 65. Further, the luminous flux of the first sub-beam 61 is greater than the sum of the luminous fluxes of the second sub-beam 63 and the third sub-beam 65. Therefore, in the present embodiment, the light source device 200 mainly emits light to the side.

Fig. 3B is a light distribution diagram of the light source device of Fig. 2; Fig. 3C is a view showing optical simulation data of the luminous intensity of the light source device of Fig. 2; In FIG. 3B, the 0 degree direction corresponds to the upward direction along the optical axis O of FIG. 2, and the direction of +90 corresponds to the direction perpendicular to the optical axis O and to the right of FIG. 2, and -90 degrees. The direction corresponds to the direction perpendicular to the optical axis O and to the left in FIG. 2, and the radial direction corresponds to the luminous intensity, and the farther away from the center, the greater the luminous intensity. In the luminous intensity pattern of Fig. 3C, the vertical axis is illuminance in units of lux, and the horizontal axis is the vertical distance from the optical axis O in millimeters. As shown in FIGS. 3B to 3C, in the present embodiment, the light source device 200 has a large light divergence angle and also has a relatively uniform overall light energy score. cloth. In more detail, as shown in FIG. 3B, in the present embodiment, the light shape of the light source device 200 is mainly distributed in a range from minus 50 degrees to minus 180 degrees and from 50 degrees to 180 degrees. As shown in FIG. 3C, after the action of the lens 100, the luminous intensity distribution of the light source device 200 exhibits a bimodal distribution, and the top of the bimodal peak is relatively flat, and the illuminance near the optical axis O is also about 300 lux, so that it can be compared. Uniform overall light energy distribution. It should be noted that the numerical ranges herein are for illustrative purposes only and are not intended to limit the invention.

In addition, referring to FIG. 1 again, in the embodiment, the direct type light source module 300 further includes a reflection unit 310, a diffusion plate 320, and at least one optical film 330. In detail, in the present embodiment, the reflecting unit 310 and the diffusing plate 320 together form an accommodating space S1 for accommodating the light source device 200, that is, the reflecting unit 310 is a light box. In another embodiment, the reflective unit 310 can also be a reflective sheet disposed at the bottom of the light box. In addition, the diffusion plate 320 is located between the reflective unit 310 and an optical film 330. In this embodiment, the optical film 330 may include at least one of a cymbal sheet, a diffusion sheet, and other optical films, but the invention is not limited thereto.

Specifically, referring to FIG. 1 , in the present embodiment, the reflection unit 310 and the diffusion plate 320 are disposed on the transmission path of the light beam 60 from the light source device 200 , and the light source device 200 is distributed on one side of the diffusion plate 320 . Further, when the light beam 60 is emitted from a different portion of the lens 100, a portion of the light beam 60 (such as light transmitted downward) will be reflected by the reflective unit 310 to the diffuser plate 320, and the other portion of the light beam 60 will be transmitted as above. The light can be directly transmitted to the diffusion plate 320. In addition, the reflecting unit 310 located at the bottom of the direct-type light source module 300 can further reverse the light that is refracted back to the bottom. The light is emitted to the diffusion plate 320, thereby increasing the utilization efficiency of light.

Furthermore, when the light is transmitted to the diffuser 320, the direct-type light source module 300 will uniformize the light distribution through the diffuser 320, and correct the light direction by the optical film 330 to enhance the direct light source. The positive luminance of the module 300. In this way, the direct light source module 300 will provide a uniform surface light source.

In the lens 100, the light source device 200, and the direct-type light source module 300 of the present embodiment, since most of the light beams 60 are emitted from the side surface of the lens 100 (ie, the light-emitting convex surface 130), the light intensity directly above the light source device 200 is obtained. Not too strong. In addition, since a small portion of the light beam is emitted from the top surface of the lens 100 (i.e., the total reflection curved surface 120), the light intensity directly above the light source device 200 is not too weak. In this way, when the light source device 200 is applied to the direct light source module 300, the light intensity at a position directly above the light source device 200 above the direct light source module 300 is not too strong or too weak. Therefore, the direct type light source module 300 of the embodiment can provide a uniform surface light source.

4 is a cross-sectional view showing a light source device according to another embodiment of the present invention. Fig. 5A is a light trace of the light source device of Fig. 4. FIG. 5B is a light distribution diagram of the light source device 200 of FIG. 4. Fig. 5C is a view showing optical simulation data of the luminous intensity of the light source device of Fig. 4. Referring to FIGS. 4 to 5A, the light source device 500 of the present embodiment is similar to the light source device 200 of FIGS. 2 to 3A, and the differences between the two are as follows. The light incident surface 410 of the lens 400 of the light source device 500 of the present embodiment is mainly formed by the sub-curved convex surface 113 and a sub-annular plane 415, and the sub-annular plane 415 surrounds the sub-curved convex surface 113.

When the illuminating element 210 emits light, the first sub-beam 61, the second sub-beam 63 and the third sub-beam 65 enter the lens 400 via the light-incident surface 410, wherein the transmission path of the first sub-beam 61 in the light source device 500 Similar to the light source device 200, the first sub-beam 61 enters the lens 400 via the sub-bend convex surface 113 of the light-incident surface 410, and then penetrates into the light surface 410, is totally reflected by the total reflection curved surface 120, and penetrates the light convex surface 130. The light source device 500 can be emitted from the side of the light source device 500. For details, please refer to the above paragraphs, and details are not described herein. On the other hand, the second sub-beam 63 and the third sub-beam 65 can enter the lens 400 via the sub-annular plane 415 and the sub-curved convex surface 113 of the light incident surface 410, respectively. After the second sub-beam 63 enters the lens 400 via the sub-annular plane 415 of the light-incident surface 410, the second sub-beam 63 can sequentially penetrate into the light surface 410, be reflected by the light-emitting convex surface 130, and penetrate the total reflection curved surface 120. After the third sub-beam 65 enters the lens 400 via the sub-bend convex surface 113 of the light-incident surface 410, the third sub-beam 65 can sequentially penetrate into the light-emitting surface 410, be totally reflected by the total reflection curved surface 120 to the light-emitting convex surface 130, and be The light exiting convex surface 130 reflects and re-penetrates into the light surface 410. In this way, as shown in FIG. 5A, by the arrangement of the lens 400, the light source device 500 can also achieve the effect of emitting light to the side and the side, and can obtain the light shape and the luminous intensity as shown in FIG. 5B and FIG. 5C. distributed.

In more detail, in the present embodiment, the 0 degree direction in FIG. 5B corresponds to the upward direction along the optical axis O of FIG. 4, and the direction of +90 corresponds to the optical axis O perpendicular to FIG. In the right direction, the direction of -90 degrees corresponds to the direction perpendicular to the optical axis O and to the left in FIG. 4, and the radial direction corresponds to the luminous intensity, and the farther away from the center, the greater the intensity of illumination. Luminous intensity pattern in Figure 5C In the middle, the vertical axis is the illuminance, the unit is Lux, and the horizontal axis is the vertical distance from the optical axis O, and the unit is mm.

Further, as shown in FIG. 5B, in the present embodiment, the light shape of the light source device 500 is mainly distributed in a range from minus 60 degrees to minus 150 degrees and from 60 degrees to 150 degrees. As shown in FIG. 5C, after the action of the lens 400, the luminous intensity distribution of the light source device 500 exhibits a bimodal distribution, and the top of the bimodal peak is relatively flat, so that a relatively uniform overall light energy distribution can be achieved. It should be noted that the numerical ranges herein are for illustrative purposes only and are not intended to limit the invention. In addition, the light source device 500 of the present embodiment can also be applied to the direct type light source module 300 of FIG. 1 , and the direct light source module 300 can also achieve the foregoing functions, which will not be described herein.

In summary, the light source device of the embodiment of the present invention, by means of the arrangement of the lens, can cause the light source device to emit light to the side and the side, thereby having a large light divergence angle and achieving a relatively uniform overall light energy distribution. Further, the direct type light source module of the embodiment of the present invention can also provide a uniform surface light source by the configuration of the light source device.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and any one of ordinary skill in the art can make some changes and refinements without departing from the spirit and scope of the present invention. The scope of the invention is defined by the scope of the appended claims.

60‧‧‧ Beam

61‧‧‧First sub-beam

63‧‧‧Second sub-beam

65‧‧‧ Third sub-beam

100‧‧‧ lens

110‧‧‧Into the glossy surface

111‧‧‧Sub-concave

113‧‧‧Child curved convex

115‧‧‧Sub-annular concave surface

115a‧‧‧Outer Rings

115b‧‧‧ Inner Ring Department

120‧‧‧ total reflection surface

130‧‧‧Light convex

200‧‧‧Light source device

210‧‧‧Lighting elements

O‧‧‧ optical axis

α, β, θ1, θ2, γ1, γ2, γ3‧‧‧ angle

d, D‧‧‧ distance

Claims (21)

A lens comprising: a light incident surface comprising a sub-curved convex surface; a total reflection curved surface opposite to the light incident surface; and a light convex surface connecting the light incident surface and the total reflection curved surface, wherein the light emitting convex surface and the light emitting convex surface The corner of the junction of the light incident surface is in the range of 75 degrees to 85 degrees, and the corner of the intersection where the light exiting convex surface meets the total reflection curved surface is in the range of 80 degrees to 90 degrees. The lens of claim 1, wherein the light incident surface further comprises a sub-annular concave surface surrounding the sub-curved convex surface. The lens of claim 2, wherein the light incident surface further comprises a sub-concave convex surface that is annular and surrounds the sub-concave surface, and the sub-curved convex surface connects the sub-concave surface and the sub-circular surface Concave. The lens of claim 2, wherein the sub-annular concave surface comprises: an outer ring portion facing away from the light convex surface; and an inner ring portion facing away from the total reflection curved surface and connecting the outer ring portion The convex surface is curved with the sub. The lens of claim 2, wherein a ratio of a distance from an edge of the light incident surface to an optical axis of the lens to a distance from a bottom of the sub-annular concave surface to an optical axis of the lens is 0.1 to Within the scope of 1.5. The lens of claim 1, further comprising an optical axis, The lens is axisymmetric with respect to the optical axis. The lens of claim 6, wherein the total reflection curved surface forms a depression, and an inclination angle of the total reflection curved surface with respect to the optical axis increases from near the optical axis to away from the optical axis. A light source device comprising: a lens comprising: a light incident surface comprising a sub-curved convex surface; a total reflection curved surface opposite to the light incident surface; and a light convex surface connecting the light incident surface and the total reflection curved surface; And a light-emitting element emitting a light beam, wherein the light beam enters the lens through the light-incident surface, wherein a first sub-beam of the light beam sequentially penetrates the light-incident surface, is totally reflected and penetrated by the total reflection surface The light emitting convex surface, and a second sub-beam of the light beam sequentially penetrates the light incident surface, is reflected by the light emitting convex surface, and penetrates the total reflection curved surface, and the light flux of the first sub beam emitted from the light emitting convex surface is greater than the The luminous flux of the second sub-beam from the totally reflective curved surface. The light source device of claim 8, wherein the light incident surface further comprises a sub-annular concave surface surrounding the sub-curved convex surface. The light source device of claim 9, wherein the light incident surface further comprises a sub-concave convex surface that is annular and surrounds the sub-concave surface, and the sub-curved convex surface connects the sub-concave surface and the sub-ring Concave surface. The light source device of claim 9, wherein the sub-ring The concave surface includes: an outer ring portion facing away from the light convex surface; and an inner ring portion facing away from the total reflection curved surface and connecting the outer ring portion and the sub-curved convex surface, wherein a third sub-beam of the light beam is sequentially Passing through the sub-curved convex surface, being totally reflected by the total reflection curved surface, being reflected by the light-emitting convex surface, being reflected by the inner ring portion, and penetrating the total reflection curved surface, and the second sub-beam from the light-emitting element sequentially penetrates The outer ring portion is reflected by the light exiting convex surface and penetrates the total reflection curved surface. The light source device of claim 9, wherein a ratio of a distance from an edge of the light incident surface to an optical axis of the lens to a distance from a bottom of the sub-annular concave surface to an optical axis of the lens is 1.1. To the range of 1.5. The light source device of claim 8, wherein the lens further comprises an optical axis, the lens is axisymmetric with respect to the optical axis, and the light emitting element is disposed on the optical axis. The light source device of claim 13, wherein the total reflection curved surface forms a depression, and an inclination angle of the total reflection curved surface with respect to the optical axis increases from near the optical axis to away from the optical axis. A direct-type light source module includes: a plurality of light source devices, each of the light source devices comprising: a lens comprising: a light incident surface comprising a sub-curved convex surface; a total reflection curved surface opposite to the light incident surface; a light convex surface connecting the light incident surface and the total reflection curved surface; a light emitting element emitting a light beam, wherein the light beam enters the lens through the light incident surface; and a diffusion plate disposed on a transmission path of the light beams from the light source devices, wherein the light source devices are distributed a side of the diffusing plate, wherein a first sub-beam of the light beam sequentially penetrates the light incident surface, is totally reflected by the total reflection curved surface, and penetrates the light emitting convex surface, and a second sub-beam of the light beam is sequentially worn The light incident surface is reflected by the light exiting surface and penetrates the total reflection curved surface, and the light flux emitted by the first sub beam from the light exiting convex surface is greater than the light flux emitted by the second sub beam from the total reflection curved surface. The direct light source module of claim 15, wherein the light incident surface further comprises a sub-annular concave surface surrounding the sub-curved convex surface. The direct light source module of claim 16, wherein the light incident surface further comprises a sub-concave surface, the sub-curved convex surface is annular and surrounds the sub-concave surface, and the sub-curved convex surface is connected to the sub-concave surface and The sub-annular concave surface. The direct-type light source module of claim 16, wherein the sub-annular concave surface comprises: an outer ring portion facing away from the light convex surface; and an inner ring portion facing away from the total reflection curved surface and connected The outer ring portion and the sub-curved convex surface, wherein a third sub-beam of the light beam sequentially penetrates the sub-curved convex surface, is totally reflected by the total reflection curved surface, is reflected by the light-emitting convex surface, is reflected and worn by the inner ring portion The total reflection surface is transmitted, and the second sub-beam from the light-emitting element sequentially penetrates the outer ring portion, is reflected by the light-emitting convex surface, and penetrates the total reflection curved surface. The direct-type light source module of claim 16, wherein a ratio of a distance from an edge of the light-incident surface to an optical axis of the lens and a distance from a bottom of the sub-annular concave surface to an optical axis of the lens is It falls within the range of 1.1 to 1.5. The direct-type light source module of claim 15, wherein the lens further comprises an optical axis, the lens is axisymmetric with respect to the optical axis, and the light-emitting element is disposed on the optical axis. The direct light source module of claim 20, wherein the total reflection curved surface forms a recess, and the tilt angle of the total reflection curved surface with respect to the optical axis is from the optical axis away from the optical axis Increment.