TWI817775B - Light source module and display device - Google Patents

Abstract

A light source module and a display device are provided. The light source module includes a light source, a light guide plate and a plurality of optical films. The optical film set includes a plurality of first optical microstructures, a plurality of second optical microstructures, and a plurality of third optical microstructures. The plurality of first optical microstructures have a first surfaces, the plurality of second optical microstructures have a second surfaces, and the plurality of third optical microstructures have a third surface. Each of the plurality of first optical microstructures respectively has a first vertex angle, each of the plurality of second optical microstructures respectively has a second vertex angle, each of the plurality of third optical microstructures respectively has a third vertex angle, and the third vertex angle is smaller than the first vertex angle, and the first vertex angle is less than or equal to the second vertex angle.

Description

Light source modules and display devices

The present invention relates to an optical module and an electronic device, and in particular to a light source module and a display device.

With the development of science and technology, display devices have become common electronic devices in daily life. Currently, some display devices provide anti-peep functions to maintain users' viewing privacy. Moreover, current display devices mostly use flat display modules to display images, among which the technology of liquid crystal display modules is relatively mature and popular. However, since the display panel of the liquid crystal display module itself cannot emit light, a backlight module is provided under the display panel to provide the light required for displaying the image.

Backlight modules can be mainly divided into edge-lit backlight modules and direct-lit backlight modules. The edge-lit backlight module uses a light guide plate to guide the light emitted by a light source arranged on the light entrance side of the light guide plate to the light exit surface of the light guide plate, thereby forming an area light source. Generally speaking, when light leaves the light exit surface of the light guide plate, it will deviate from the normal line. Therefore, it is usually necessary to use a diffuser to scatter the light in multiple directions, and then use the diffuser to make the light accurate. Straighten. Then, the collimated light passes through the upper layer with concealing function. The diffusion sheet diffuses, thereby forming a surface light source with sufficient brightness and uniformity.

However, under the above configuration, due to the configuration of the lower diffuser of the backlight module, the light shape of the light will have a larger half-width at the viewing angles in the horizontal and vertical directions, and can only be controlled within the half-width of the viewing angle ( Full width at half maximum, FWHM) emit light within a range of 50°. Therefore, when a display device needs to be used in a display device with high privacy and anti-peep requirements and requires a backlight module that can provide a narrow viewing angle, the prior art backlight module does not meet the product requirements. Therefore, developing a backlight module suitable for use in a display device with an anti-peep function is an issue that needs to be solved urgently.

The "prior art" paragraph is only used to help understand the content of the present invention. Therefore, the content disclosed in the "prior art" paragraph may contain some conventional technologies that do not constitute common knowledge to those with ordinary knowledge in the technical field. The content disclosed in the "Prior Art" paragraph does not mean that the content or the problems to be solved by one or more embodiments of the present invention have been known or recognized by those with ordinary knowledge in the technical field before the application of the present invention.

The present invention provides a light source module whose light output shape has a narrow viewing angle and good brightness.

The present invention provides a display device with anti-peep function and good picture quality.

In order to achieve one, part or all of the above purposes or other purposes, the present invention An embodiment of the invention provides a light source module. The light source module includes a light source, a light guide plate and an optical film set. The light source has multiple light-emitting elements. The light incident surface of the light guide plate faces the plurality of light emitting elements. The optical film set overlaps the light exit surface of the light guide plate, and the optical film set includes a plurality of first optical microstructures, a plurality of second optical microstructures and a plurality of third optical microstructures. The plurality of first optical microstructures have a first surface, wherein the plurality of first optical microstructures extend along a first direction, and the plurality of first optical microstructures face the light guide plate. The plurality of second optical microstructures have a second surface, wherein the second surface is located on a side of the first surface away from the light guide plate, the plurality of second optical microstructures extend along the second direction, and the first direction is parallel to the second direction, And a plurality of second optical microstructures are located behind the light guide plate. The plurality of third optical microstructures have a third surface, wherein the second surface is located between the first surface and the third surface, the plurality of third optical microstructures extend along the third direction, and the plurality of third optical microstructures are directed back to In the light plate, the third direction is orthogonal to the first direction, each of the plurality of first optical microstructures has a first vertex angle, each of the plurality of second optical microstructures has a second vertex angle, and each of the plurality of third optical microstructures has a second vertex angle. The structures each have a third vertex angle, and the third vertex angle is less than the first vertex angle, and the first vertex angle is less than or equal to the second vertex angle.

In order to achieve one, part or all of the above objects or other objects, an embodiment of the present invention provides a display device. The display device includes the above-mentioned light source module and display panel. The display panel is located on the side of the optical film set away from the light guide plate.

In an embodiment of the present invention, the above-mentioned light source module conforms to the following relationship: 0.83≦θ1/θ2≦1.14, 0.54≦θ3/θ2≦0.80, where θ1 is the first vertex angle and θ2 is the second vertex angle. , θ3 is the third vertex angle.

In an embodiment of the present invention, the arrangement of the above-mentioned plurality of light-emitting elements is There is an included angle between the direction and the first direction, and the value of the included angle is between 80 degrees and 100 degrees.

In an embodiment of the present invention, the plurality of first optical microstructures, the plurality of second optical microstructures and the plurality of third optical microstructures are microstructures, and the plurality of optical films include first prisms. The lens, the second lens and the third lens. The first surface is a surface of the first film facing the light guide plate. The second surface is a surface of the second film away from the light guide plate. The third surface is the surface of the third film away from the light guide plate.

In an embodiment of the present invention, the third vertex angle has an angle value between 54 degrees and 64 degrees.

In an embodiment of the present invention, the above-mentioned light source module further includes an adsorption prevention structure. The adsorption prevention structure is provided on the surfaces of the first and second fiber sheets facing each other.

In an embodiment of the present invention, the above-mentioned first and second silica sheets have haze, and the haze of the first and second silica sheets ranges from 0% to 50%.

In an embodiment of the present invention, the plurality of first optical microstructures, the plurality of second optical microstructures and the plurality of third optical microstructures are microstructures, and the plurality of optical films include first prisms. Lenses and third lenses. The first surface is a surface of the first lens facing the light guide plate, and the second surface is a surface of the first lens facing away from the light guide plate. The third surface is the surface of the third film away from the light guide plate.

In an embodiment of the present invention, the above-mentioned light source module conforms to the following relationship: 0.83≦θ1/θ2≦1.14, 0.47≦θ3/θ2≦0.89, where θ1 is the first vertex angle and θ2 is the second vertex angle. , θ3 is the third vertex angle.

In an embodiment of the present invention, the third vertex angle has an angle value between 47 degrees and 71 degrees.

In an embodiment of the present invention, the above-mentioned first haze sheet has haze, and the haze of the first haze sheet is between 0% and 50%.

Based on the above, in the light source module and the display device according to an embodiment of the present invention, the light source module passes through a plurality of first optical microstructures, a plurality of second optical microstructures and a plurality of third optical microstructures of the optical film. The configuration can greatly improve the collimation of light, and realize that the light shape of the light source module has a small enough half-width at the viewing angle in the horizontal and vertical directions. For example, the light shape of the light source module in the horizontal and vertical directions The viewing angle half maximum width (FWHM) can be maintained within 24°. In this way, the illumination beam provided by the light source module can be focused toward a specific viewing angle to meet the requirement of collimated light emission, thereby enabling the display device to be used to implement an anti-peep function. In addition, the light source module also improves optical utilization and has good brightness, which can reduce the energy consumption of the light source module and the display device, and enable the display device to have good picture quality.

In order to make the above-mentioned features and advantages of the present invention more obvious and easy to understand, embodiments are given below and described in detail with reference to the accompanying drawings.

100, 100A, 100’: light source module

110:Light source

111:Light-emitting component

120:Light guide plate

130, 130A: The first film

140: The second film

150:The third film

160: Upper diffuser

200, 200A: display device

210:Display panel

AP: adsorption prevention structure

D1: first direction

D2: second direction

D3: Third direction

DA: Arrangement direction

DF: diffusion particle

DR: lower reflective sheet

ES: light-emitting surface

F:frame

FM: Optical film

IS: light incident surface

IL: illumination beam

L: beam

MS1: The first optical microstructure

MS2: Second optical microstructure

MS3: The third optical microstructure

MSA, MSB, MSC: microstructure

OS:Microstructure

P1, P2, P3: spacing

S1: first surface

S2: Second surface

S3: Third surface

UR: upper reflective sheet

θ1: first vertex angle

θ2: second vertex angle

θ3: The third vertex angle

γ1, γ2, γ3: included angle

FIG. 1A is a schematic structural diagram of a display device according to an embodiment of the present invention.

Figure 1B is an exploded schematic diagram of the light source module of Figure 1A.

FIG. 2A is a schematic structural diagram of the first blade of FIG. 1A.

FIG. 2B is a schematic structural diagram of the second blade of FIG. 1A.

FIG. 2C is a schematic structural diagram of the third blade of FIG. 1A.

3A to 3E are respectively schematic diagrams of the light field after the light beam of FIG. 1A penetrates through different optical surfaces.

4 and 5 are respectively graphs showing the relationship between the viewing angle and the luminance intensity ratio of the illumination beam of the light source module in FIG. 1A in the horizontal direction and the vertical direction.

6A to 6E are respectively schematic structural diagrams of different microstructures of various embodiments of the present invention.

7A to 7C are schematic views of the relative positions of the extending directions of the first optical microstructure, the second optical microstructure and the third optical microstructure with respect to the arrangement direction of the light emitting elements according to another embodiment of the present invention.

FIG. 8A is a schematic structural diagram of a display device according to another embodiment of the present invention.

Figure 8B is an exploded schematic diagram of the light source module of Figure 8A.

The foregoing and other technical contents, features and effects of the present invention will be clearly presented in the following detailed description of a preferred embodiment with reference to the drawings. Directional terms mentioned in the following embodiments, such as up, down, left, right, front or back, etc., are only for reference to the directions in the attached drawings. Accordingly, the directional terms used are illustrative and not limiting of the invention.

FIG. 1A is a schematic structural diagram of a display device according to an embodiment of the present invention. Figure 1B is an exploded schematic diagram of the light source module of Figure 1A. Figure 2A is the first view of Figure 1A Schematic diagram of the structure of the film. FIG. 2B is a schematic structural diagram of the second blade of FIG. 1A. FIG. 2C is a schematic structural diagram of the third blade of FIG. 1A. Referring to FIGS. 1A and 1B , the display device 200 includes a light source module 100 and a display panel 210 . The light source module 100 includes a light source 110, a light guide plate 120, a frame F, an upper reflective sheet UR, a lower reflective sheet DR, an optical film set FM, and an upper diffusion sheet 160, and the display panel 210 is located in the optical film set FM away from the light guide plate 120 side. The light source 110 has a plurality of light-emitting elements 111. The light-incident surface IS of the light guide plate 120 faces the plurality of light-emitting elements 111, and the plurality of light-emitting elements 111 are arranged in a direction parallel to the light incident surface IS of the light guide plate 120, as shown in FIG. 1B As shown in the figure, the light-emitting elements 111 are arranged along the X-axis direction, for example. For example, in this embodiment, the outline of the light guide plate 120 may be a flat plate or a wedge-shaped plate, but the invention is not limited thereto. In addition, a microstructure OS may be provided on the lower surface of the light guide plate 120 to destroy the total reflection behavior of the light beam L transmitted in the light guide plate 120 so that the light beam L is transmitted to the light exit surface ES of the light guide plate 120 to emit light. In this embodiment, the microstructure OS of the light guide plate 120 can be distributed in the form of laser dots, local dots or through-grooves, and can be concave or convex relative to the lower surface of the light guide plate 120. The present invention does not use This is the limit. It should be further explained that in FIG. 1B , in order to clearly show the arrangement of the light source 110 , the light guide plate 120 , the lower reflective sheet DR, the optical film group FM and the upper diffusion sheet 160 , the upper reflective sheet UR and the frame are omitted. F.

Furthermore, as shown in FIGS. 1A and 1B , the optical film group FM overlaps the light exit surface ES of the light guide plate 120 . For example, in this embodiment, the optical film set FM includes a first lens 130, a second lens 140, and a third lens 150. Moreover, as shown in FIG. 1B , in this embodiment, the optical film group FM includes A plurality of first optical microstructures MS1, a plurality of second optical microstructures MS2 and a plurality of third optical microstructures MS3, wherein the plurality of first optical microstructures MS1, the plurality of second optical microstructures MS2 and the plurality of third optical microstructures MS3 The optical microstructure MS3 is, for example, a phosphorus microstructure. Furthermore, as shown in FIG. 1B , in this embodiment, the plurality of first optical microstructures MS1 have a first surface S1 , the plurality of second optical microstructures MS2 have a second surface S2 , and the plurality of third optical microstructures MS2 have a second surface S2 . The microstructure MS3 has a third surface S3, in which the first surface S1 is the surface of the first lens 130 facing the light guide plate 120, the second surface S2 is the surface of the second lens 140 away from the light guide plate 120, and the third surface S3 is the surface of the second lens 130 facing the light guide plate 120. The three-dimensional film 150 is away from the surface of the light guide plate 120 . It should be further explained that the first lens 130 , the second lens 140 and the third lens 150 are arranged upward from the light exit surface ES of the light guide plate 120 .

That is to say, as shown in FIG. 1B , the second surface S2 is located on the side of the first surface S1 away from the light guide plate 120 , the second surface S2 is located between the first surface S1 and the third surface S3 , and a plurality of first optical The microstructure MS1 faces the light guide plate 120 , while the plurality of second optical microstructures MS2 and the plurality of third optical microstructures MS3 face the light guide plate 120 . Moreover, as shown in FIG. 1B , in this embodiment, a plurality of first optical microstructures MS1 extend along the first direction D1, a plurality of second optical microstructures MS2 extend along the second direction D2, and a plurality of third optical microstructures MS1 extend along the first direction D1. The optical microstructure MS3 extends along the third direction D3. In this embodiment, the first direction D1 is parallel to the second direction D2, the third direction D3 is orthogonal to the first direction D1, and the arrangement direction DA of the plurality of light-emitting elements 111 is parallel to the third direction D3 and is parallel to the first direction D3. The direction D1 and the second direction D2 are orthogonal. The first direction D1 and the second direction D2 may also intersect with each other. For example, the first direction D1 and the second direction D2 may intersect with each other. There may be an included angle between the directions D2, and the range of the included angle may be between ±5°. It should be noted that the range of the included angle is not limited to this.

Furthermore, as shown in FIGS. 2A to 2C , in this embodiment, each of the first optical microstructures MS1 has a first vertex angle θ1 , and each of the second optical microstructures MS2 has a first vertex angle θ1 . The angle θ2 of the two vertex angles, each of the plurality of third optical microstructures MS3 respectively has an angle θ3 of the third vertex angle, and the angle θ3 of the third vertex angle is smaller than the angle θ1 of the first vertex angle, and the angle θ1 of the first vertex angle An angle θ2 that is less than or equal to the second vertex angle. Furthermore, in this embodiment, the angle θ1 of the first vertex angle, the angle θ2 of the second vertex angle, and the angle θ3 of the third vertex angle of the light source module 100 comply with the following relationship: 0.83≦θ1/θ2 ≦1.14, 0.54≦θ3/θ2≦0.80. For example, in this embodiment, when the angle θ1 of the first vertex angle and the angle θ2 of the second vertex angle are 90 degrees, the angle value of the angle θ3 of the third vertex angle may be between 54 degrees and 64 degrees. time, and the best brightness value can be obtained when the angle value of the third vertex angle θ3 is 60 degrees.

On the other hand, as shown in FIGS. 2A to 2C , in this embodiment, the pitch P1 of the plurality of first optical microstructures MS1 , the pitch P2 of the plurality of second optical microstructures MS2 and the plurality of third optical microstructures The pitch P3 of the microstructure MS3 is less than or equal to 100 microns, but the present invention is not limited thereto. In other embodiments, the pitch P1 of the plurality of first optical microstructures MS1, the pitch P2 of the plurality of second optical microstructures MS2, and the pitch P1 of the plurality of third optical microstructures MS3 can be based on the display device 200. Make changes based on needs.

Furthermore, as shown in FIG. 1B , FIG. 2A and FIG. 2B , in this embodiment, the light source module 100 further includes an adsorption prevention structure AP. The adsorption prevention structure AP is set in the On the surfaces of the first and second insulators 130 and 140 facing each other, the surfaces may be rough surfaces to avoid interference (such as Newton's rings) between the first and second insulators 130 and 140 due to adsorption. And then affect the visual effect. In addition, as shown in FIGS. 2A and 2B , in this embodiment, the first and second silica sheets 130 and 140 may include diffusion particles DF to have haze. For example, in this embodiment, the haze of the first fiber optic film 130 and the second fiber optic film 140 is between 0% and 50%. In this embodiment, the diffusion particles DF are located in the adsorption prevention structure AP. However, this is not a limitation. In another embodiment, the diffusion particles DF can also be located in the first optical microstructure MS1 and the second optical microstructure MS2 . It should be further explained that the adsorption prevention structure AP can be a photosensitive adhesive layer with diffusion particles DF. The diffusion particles DF are covered by the photosensitive adhesive layer. The photosensitive adhesive layer is made of, for example, UV glue or UV glue. Other suitable transparent photosensitive adhesive materials, the material of the diffusion particles DF may include polymethyl methacrylate (PMMA), polystyrene (PS), or copolymers of the above materials. On the other hand, , in this embodiment, the diffusion particles DF may be spherical and have a variety of particle sizes, but the invention is not limited thereto.

In this way, as shown in FIG. 1A , after the light beam L provided by the light source 110 is emitted from the light source 110 , it will be reflected between the upper reflective sheet UR and the lower reflective sheet DR and travel in the light guide plate 120 . Moreover, when the light beam L passes through the microstructure OS, its total reflection behavior will be destroyed, and it can be transmitted to the light exit surface ES of the light guide plate 120 to emit light. Then, the light beam L sequentially passes through the plurality of first optical microstructures MS1, the plurality of second optical microstructures MS2 and the plurality of third optical microstructures MS3 of the optical film group FM located on the transmission path of the light beam L to form Illumination beam IL. The display panel 210 is located on the illumination beam On the transmission path of IL, the display screen can be formed by the illumination beam IL.

The following will further illustrate the light field distribution of the light beam L provided by the light source 110 after penetrating different optical surfaces with reference to FIGS. 3A to 3E .

Figures 3A to 3E are respectively schematic diagrams of the light field after the light beam L in Figure 1A penetrates through different optical surfaces. The areas filled with the same grid bottom pattern represent value ranges with similar light field energy values, and the grid bottom Areas with denser dot distribution in the pattern are represented as value ranges with higher light field energy values (i.e. areas with higher luminance values). Further, please refer to FIG. 3A. In this embodiment, FIG. 3A illustrates the light field energy distribution when the light beam L is emitted from the light guide plate 120. It should be noted that when the light beam L leaves the light exit surface of the light guide plate 120, , there will be a phenomenon of deviating from the normal and emitting in a direction away from the light source 110 . Next, when the light beam L passes through the first surface S1 provided with the plurality of first optical microstructures MS1, since the first optical microstructures MS1 face the light guide plate 120, and the extending direction of the plurality of first optical microstructures MS1 is in line with the light beam L The direction of travel is parallel, so the light field energy distribution of the light beam L after passing through the first optical microstructure MS1 can be divided into two halves, forming the light field energy distribution as shown in Figure 3B.

Then, when the light beam L passes through the second surface S2 provided with the plurality of second optical microstructures MS2, since the second optical microstructure MS2 faces away from the light guide plate 120, and the extension direction of the plurality of second optical microstructures MS2 is in line with the light beam L The direction of travel is parallel, so the viewing angle of the light beam L in the horizontal direction (ie, the X-axis direction as shown in Figure 1B) after passing through the second optical microstructure MS2 can be converged, forming a light field as shown in Figure 3C Energy distribution.

Next, when the light beam L passes through the third optical microstructure MS3 provided with a plurality of third optical microstructures When the three surfaces are S3, since the third optical microstructure MS3 faces away from the light guide plate 120, and the extending direction of the third optical microstructure MS3 is orthogonal to the extending direction of the second optical microstructure MS2, therefore, after passing through the third optical microstructure MS3 The viewing angle of the light beam L in the vertical direction (ie, the Y-axis direction as shown in Figure 1B) can be converged, forming a light field energy distribution as shown in Figure 3D. In this way, the requirement for collimated light emission can be achieved.

Finally, the light beam L passes through the upper diffuser 160, and the configuration of the upper diffuser 160 can suppress stray light and increase concealment, thereby forming a light field energy distribution as shown in FIG. 3E. In addition, in this embodiment, in addition to using the upper diffuser 160 , a reflective polarizing brightness enhancement film (DBEF) can also be used to replace the upper diffuser 160 , which can also have similar effects.

In this way, the light source module 100 can greatly improve the collimation of light through the configuration of the plurality of first optical microstructures MS1, the plurality of second optical microstructures MS2 and the plurality of third optical microstructures MS3 of the optical film FM. In order to achieve a sufficiently small half-maximum width of the light emitting light shape in the horizontal and vertical directions of the viewing angle, for example, the light emitting light shape of the light source module 100 can maintain a half-maximum width (FWHM) of the viewing angle in the horizontal and vertical directions. Within 24°. In this way, the illumination beam IL provided by the light source module 100 can be focused toward a specific viewing angle to meet the requirement of collimated light emission, thereby enabling the display device 200 to be used to implement the anti-peep function. Further description will be given below with reference to Figures 4 and 5 .

4 and 5 are respectively graphs showing the relationship between the viewing angle and the luminance intensity ratio of the illumination beam IL of the light source module 100 in FIG. 1A in the horizontal direction and the vertical direction. First, it should be explained that the structure of the existing light source module 100' shown in Figures 4 and 5 The parts of the light source module 100 of this case are the same, but the difference lies in that there is a gap between the two front lenses (the second lens 140 and the third lens 150) of the light source module 100 and the light guide plate 120. The first mirror 130 includes the first optical microstructure MS1, and the existing light source module 100' uses a lower diffuser between the two front mirrors and the light guide plate. In this way, as shown in Figures 4 and 5, the illumination beam IL provided by the existing light source module 100' has a horizontal viewing angle half maximum width (FWHM) of 48° and a vertical viewing angle half maximum width (FWHM) of 44°. In contrast, the illumination beam IL provided by the light source module 100 of this case has a horizontal viewing angle half maximum width (FWHM) of 24° and a vertical viewing angle half maximum width (FWHM) of 21°. Compared with the existing light source module 100 'It can significantly reduce the full width at half maximum (FWHM) of the light field, and the horizontal viewing angle peak is -1° and the vertical viewing angle peak is 0°. It can be seen that the light source module 100 of this case not only greatly improves the collimation of light, but also improves the optical utilization rate, increasing the brightness gain by 20% compared to the existing light source module 100', thereby reducing the cost of the light source module 100 and The energy consumption of the device 200 is displayed.

In addition, it is worth noting that in the aforementioned embodiments, the plurality of first optical microstructures MS1, the plurality of second optical microstructures MS2, and the plurality of third optical microstructures MS3 have fixed spacings P1, P2, and P3. and a regular shape with a fixed height are examples, but the invention is not limited thereto. In other embodiments, a plurality of first optical microstructures MS1, a plurality of second optical microstructures MS2, and a plurality of third optical microstructures MS3 It can also be an irregular shape with unequal pitches P1, P2, P3 and/or unequal heights. Further description will be given below with reference to FIGS. 6A to 6E .

6A to 6E are respectively schematic structural diagrams of different microstructures of various embodiments of the present invention. For example, a plurality of first optical microstructures MS1, a plurality of The second optical microstructure MS2 and the plurality of third optical microstructures MS3 can be formed in the pattern of a plurality of microstructures MSA as shown in FIG. 6A , wherein the plurality of microstructures MSA have unequal distances between them. Spacing and unequal height changes. Alternatively, the plurality of first optical microstructures MS1, the plurality of second optical microstructures MS2, and the plurality of third optical microstructures MS3 can also be in the form of multiple microstructures MSB as shown in FIG. 6B and FIG. 6C Formed, each microstructure MSB has unequal height changes in its extension direction, and the outline appears to be an irregular shape swinging up and down. Alternatively, the plurality of first optical microstructures MS1, the plurality of second optical microstructures MS2, and the plurality of third optical microstructures MS3 can also be in the form of multiple microstructures MSC as shown in FIG. 6D and FIG. 6E Formation, in which multiple microstructured MSCs have unequal spacing changes, and the outline of each microstructured MSC appears to be in an irregular shape swinging left and right in its extension direction.

When the plurality of first optical microstructures MS1, the plurality of second optical microstructures MS2, and the plurality of third optical microstructures MS3 adopt any one of the microstructures MSA, MSB, and MSC of FIGS. 6A to 6E, as long as The relationship between the angle θ1 of the first vertex angle, the angle θ2 of the second vertex angle, and the angle θ3 of the third vertex angle is the same as in the aforementioned embodiment, so that the light source module 100 and the display device 200 can still achieve the aforementioned effects and effects. The advantages will not be repeated here.

In addition, it is worth noting that in the foregoing embodiments, although the arrangement direction DA of the plurality of light-emitting elements 111 is parallel to the third direction D3 and orthogonal to the first direction D1 and the second direction D2, as an example, this The invention is not limited to this. In other embodiments, the first optical microstructure MS1, the second optical microstructure MS2 and the third optical microstructure The extension direction of the structure MS3 can be appropriately adjusted relative to the arrangement direction DA of the light emitting elements 111 . Further description will be provided below with reference to FIGS. 7A to 7C .

7A to 7C are schematic diagrams of the relative positions of the extending directions of the first optical microstructure MS1, the second optical microstructure MS2 and the third optical microstructure MS3 with respect to the arrangement direction DA of the light emitting elements 111 according to another embodiment of the present invention. , wherein the plurality of first optical microstructures MS1 extend along the first direction D1, the plurality of second optical microstructures MS2 extend along the second direction D2, and the plurality of third optical microstructures MS3 extend along the third direction D3. . Please refer to FIGS. 7A to 7C . In this embodiment, the light source module 100 can make the angle γ1 between the arrangement direction DA of the plurality of light-emitting elements 111 and the first direction D1 to be between 80 degrees and 100 degrees. time, and the angle value of the angle γ2 between the corresponding arrangement direction DA of the plurality of light-emitting elements 111 and the second direction D2 is also between 80 degrees and 100 degrees, and the arrangement direction DA of the plurality of light-emitting elements 111 is also between 80 degrees and 100 degrees. The angle value of γ3 between the third direction D3 and the third direction D3 is between -10 degrees and 10 degrees. In this way, the optical elements in the light source module 100 can avoid being damaged by periodic structures (such as the microstructure OS of the light guide plate 120 or the first optical microstructure MS1, the second optical microstructure MS2 and the third optical microstructure MS1 of the optical film FM). Structure MS3) and the display pixels of the display panel 210 generate interference fringes (Moiré pattern).

In addition, it is worth noting that in the aforementioned embodiments, the optical film set FM includes the first lens 130, the second lens 140, and the third lens 150, but the present invention is not limited thereto. In other embodiments, the optical film set FM may also include only the first lens 130A and the third lens 150. Further description will be given below with reference to FIGS. 8A and 8B .

FIG. 8A is a schematic structural diagram of a display device according to another embodiment of the present invention. Figure 8B is an exploded schematic diagram of the light source module of Figure 8A. Please refer to FIGS. 8A and 8B . In this embodiment, the light source module 100A and the display device 200A are similar to the light source module 100 and the display device 200 of FIGS. 1A and 1B , and the differences between the two are as follows. In this embodiment, the optical film set FM of the light source module 100A only includes the first lens 130A and the third lens 150, and the first surface S1 on which the first optical microstructure MS1 is provided is the first lens. 130A faces the surface of the light guide plate 120, and the second surface S2 on which the second optical microstructure MS2 is provided is the surface of the first optical film 130A away from the light guide plate 120. Moreover, in this embodiment, the angle θ1 of the first vertex angle, the angle θ2 of the second vertex angle, and the angle θ3 of the third vertex angle of the light source module 100A comply with the following relational expression: 0.83≦θ1/θ2≦1.14, 0.47≦θ3/θ2≦0.89. For example, in this embodiment, when the angle θ1 of the first vertex angle and the angle θ2 of the second vertex angle are 90 degrees, the angle value of the angle θ3 of the third vertex angle may be between 47 degrees and 71 degrees. between. In this embodiment, the first haze sheet 130A has haze, and the haze of the first haze sheet 130A is between 0% and 50%. It should be further explained that in FIG. 8B , in order to clearly show the arrangement of the light source 110 , the light guide plate 120 , the lower reflective sheet DR, the optical film group FM and the upper diffusion sheet 160 , the upper reflective sheet UR and the frame are omitted. F.

In this way, by forming the first optical microstructure MS1 and the second optical microstructure MS2 on the surfaces on both sides of the first optical chip 130A, the thickness of the light source module 100A can be reduced. Moreover, through the configuration of the plurality of first optical microstructures MS1, the plurality of second optical microstructures MS2 and the plurality of third optical microstructures MS3 of the optical film FM, the light source module 100A can also greatly improve the collimation of light. , and can achieve its The light shape has a sufficiently small full width at half maximum in the horizontal and vertical directions. For example, the light shape at half maximum (FWHM) in the horizontal and vertical directions of the light source module 100A can be 30° and 18° respectively. °, and its brightness gain can be increased by 21% compared to the existing light source module 100'.

In this way, the illumination beam IL provided by the light source module 100A can also meet the requirement of collimated light emission, and can achieve similar effects and advantages as the aforementioned light source module 100, which will not be described again here. Moreover, the display device 200A using the light source module 100A can also achieve similar effects and advantages as the aforementioned display device 200, which will not be described again here.

To sum up, in the light source module and the display device according to an embodiment of the present invention, the light source module passes through the plurality of first optical microstructures, the plurality of second optical microstructures and the plurality of third optical films. The configuration of the microstructure can greatly improve the collimation of light, and achieve a sufficiently small half-width in the horizontal and vertical viewing angles. For example, the light shape of the light source module can be in the horizontal and vertical directions. The viewing angle at half maximum (FWHM) in the vertical direction can be maintained within 24°. In this way, the illumination beam provided by the light source module can be focused toward a specific viewing angle to meet the requirement of collimated light emission, thereby enabling the display device to be used to implement an anti-peep function. In addition, the light source module also improves optical utilization and has good brightness, which can reduce the energy consumption of the light source module and the display device, and enable the display device to have good picture quality.

However, the above are only preferred embodiments of the present invention, and should not be used to limit the scope of the present invention. That is, simple equivalent changes and modifications may be made based on the patent scope of the present invention and the description of the invention. are still covered by the patent of this invention within the range. In addition, any embodiment or patentable scope of the present invention does not need to achieve all the purposes, advantages or features disclosed in the present invention. In addition, the abstract section and title are only used to assist in searching patent documents and are not intended to limit the scope of the invention. In addition, terms such as “first” and “second” mentioned in this specification or the scope of the patent application are only used to name elements or to distinguish different embodiments or scopes, and are not used to limit the number of elements. upper or lower limit.

100:Light source module

110:Light source

111:Light-emitting component

120:Light guide plate

130:The first film

140: The second film

150:The third film

160: Upper diffuser

AP: adsorption prevention structure

D1: first direction

D2: second direction

D3: Third direction

DA: Arrangement direction

DR: lower reflective sheet

ES: light-emitting surface

FM: Optical film

IS: light incident surface

MS1: The first optical microstructure

MS2: Second optical microstructure

MS3: The third optical microstructure

S1: first surface

S2: Second surface

S3: Third surface

Claims (12)

A light source module includes: a light source with a plurality of light-emitting elements; a light guide plate, the light incident surface of the light guide plate faces the plurality of light-emitting elements; and an optical film group that overlaps the light output of the light guide plate. surface, and the optical film set includes: a plurality of first optical microstructures having a first surface, wherein the plurality of first optical microstructures extend along a first direction, and the plurality of first optical microstructures extend along a first direction. The structure faces the light guide plate; a plurality of second optical microstructures has a second surface, wherein the second surface is located on a side of the first surface away from the light guide plate, the plurality of second optical microstructures extending along a second direction, the first direction being parallel to the second direction, and the plurality of second optical microstructures facing away from the light guide plate; and a plurality of third optical microstructures having a third surface , wherein the second surface is located between the first surface and the third surface, the plurality of third optical microstructures extend along the third direction, and the plurality of third optical microstructures face away from the In the light guide plate, the third direction is orthogonal to the first direction, each of the plurality of first optical microstructures has a first vertex angle, and each of the plurality of second optical microstructures has a second vertex angle. Vertex angle, each of the plurality of third optical microstructures respectively has a third vertex angle, and the third vertex angle is less than the first vertex angle, and the first vertex angle is less than or equal to the second vertex angle. The light source module as described in claim 1, the light source module conforms to the following relationship: 0.83≦θ1/θ2≦1.14, 0.54≦θ3/θ2≦0.80, where θ1 is the angle of the first vertex angle, θ2 is the angle of the second vertex angle, and θ3 is the angle of the third vertex angle. The light source module of claim 1, wherein the arrangement direction of the plurality of light-emitting elements has an included angle with the first direction, and the included angle has an angle value between 80 degrees and 100 degrees. The light source module of claim 1, wherein the plurality of first optical microstructures, the plurality of second optical microstructures and the plurality of third optical microstructures are microstructures, and the The optical film set includes: a first optical film, wherein the first surface is a surface of the first optical film facing the light guide plate; a second optical film, wherein the second surface is the second optical film A surface away from the light guide plate; and a third lens piece, wherein the third surface is a surface of the third lens sheet away from the light guide plate. The light source module according to claim 4, wherein the third vertex angle has an angle value between 54 degrees and 64 degrees. The light source module according to claim 4, further comprising: an adsorption prevention structure disposed on the surfaces of the first and second lenses facing each other. The light source module of claim 4, wherein the first and second pixels have haze, and the haze of the first and second pixels is between 0%. to 50%. The light source module of claim 1, wherein the plurality of first optical microstructures, the plurality of second optical microstructures and the plurality of third optical microstructures are microstructures, and the The optical film set includes: a first lens, wherein the first surface is a surface of the first lens facing the light guide plate, and wherein the second surface is a surface of the first lens away from the light guide plate. The surface of the third phosphorus film; and a third phosphorus film, wherein the third surface is a surface of the third phosphorus film away from the light guide plate. The light source module as described in claim 1, the light source module conforms to the following relationship: 0.83≦θ1/θ2≦1.14, 0.47≦θ3/θ2≦0.89, where θ1 is the angle of the first vertex angle, θ2 is the angle of the second vertex angle, and θ3 is the angle of the third vertex angle. The light source module of claim 4, wherein the third vertex angle has an angle value between 47 degrees and 71 degrees. The light source module of claim 8, wherein the first haze has a haze, and the haze of the first haze is between 0% and 50%. A display device includes: a light source module, which includes: a light source with multiple light-emitting elements; a light guide plate, the light incident surface of the light guide plate faces the plurality of light emitting elements; and an optical film set overlaps the light exit surface of the light guide plate, and the optical film set includes: a plurality of first An optical microstructure having a first surface, wherein the plurality of first optical microstructures extend along a first direction, and the plurality of first optical microstructures face the light guide plate; a plurality of second optical microstructures, Having a second surface, wherein the second surface is located on a side of the first surface away from the light guide plate, the plurality of second optical microstructures extend along a second direction, and the first direction is parallel to the light guide plate. the second direction, and the plurality of second optical microstructures face away from the light guide plate; and a plurality of third optical microstructures have a third surface, wherein the second surface is located between the first surface and the light guide plate. Between the third surfaces, the plurality of third optical microstructures extend along a third direction, the plurality of third optical microstructures face away from the light guide plate, and the third direction and the first direction Orthogonal, and each of the plurality of first optical microstructures respectively has a first vertex angle, each of the plurality of second optical microstructures respectively has a second vertex angle, and each of the plurality of third optical microstructures respectively has a A third vertex angle, and the third vertex angle is less than the first vertex angle, and the first vertex angle is less than or equal to the second vertex angle; and The display panel is located on the side of the optical film set away from the light guide plate.

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