CN217060550U

CN217060550U - Light control plate, optical module with same and display device

Info

Publication number: CN217060550U
Application number: CN202220380392.9U
Authority: CN
Inventors: 山口勝; 見村知哉
Original assignee: Ways Electron Co ltd
Current assignee: Ways Electron Co ltd
Priority date: 2022-02-24
Filing date: 2022-02-24
Publication date: 2022-07-26
Anticipated expiration: 2032-02-24

Abstract

The utility model discloses an optical control board, including the base plate with be located the periodic distribution's of being on a surface of base plate at least microstructure, every microstructure is asymmetric microstructure or the symmetric microstructure who forms by asymmetric microstructure, incident light passes through the regulating action of microstructure on the optical control board, changes the required output light distribution of light path formation, for example widen the horizontal direction on the left and right sides or control the ascending visual angle of certain one side direction, restrain the ascending visual angle of vertical side for on-vehicle display system, thereby can avoid showing that the image maps to windshield influences driver's sight, just the utility model discloses a endow the shape that has optical characteristic element to the base plate, simple structure, the processing cost is lower.

Description

Light control plate, optical module with same and display device

Technical Field

The utility model relates to an optics technical field especially relates to a change light control board of light-emitting angle, has optical module and display device of this light control board.

Background

In the field of on-vehicle display, a display device capable of increasing the exit angle in the X direction and suppressing the exit angle in the Y direction is required. This is because suppressing the exit angle in the Y direction can prevent the display image from reflecting on the windshield and affecting the driver's sight line. On the other hand, in the X direction, since the display content needs to be viewed from the driver and the passenger side at the same brightness, it is necessary to enlarge the X-direction view angle. The existing technology expands the X direction by increasing a shielding object (louver) to expand the X direction (left and right) emergence angle, and inhibits the Y direction (up and down) emergence angle by increasing a film (film). Further, recently, as the display device is increased in size, there are products that are large enough to extend to the passenger side, and if the viewing angle in the X direction of the product is too large, it is predicted that a problem will occur in that the image will be reflected on the side window. Therefore, there is a need for development of an optical control plate that has a simple structure and low cost and can increase the emission angle only in either the left or right direction or both the left and right directions.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects, the utility model provides an optical control board has optical module and display device of this optical control board, and the simple structure of this control board, it is with low costs, and can restrain Y direction visual angle, enlarge the visual angle of certain one side about the horizontal direction or the visual angle of the horizontal direction left and right sides all enlarges.

The utility model discloses a solve the technical scheme that its technical problem adopted and be: there is provided an optical control panel comprising: a substrate having a first surface and a second surface; a plurality of microstructures periodically arranged on at least one surface of the substrate; each microstructure comprises at least one asymmetric microstructure; wherein the asymmetric microstructure comprises a first side that is substantially planar and a second side that is defined as non-planar.

As a further improvement of the present invention, each microstructure is an asymmetric microstructure, or each microstructure is a symmetric microstructure formed by asymmetric microstructures disposed face to face.

As a further improvement of the present invention, the second side surface is a convex curved surface.

As a further improvement of the present invention, the angle value of the included angle formed by the first side surface and the second side surface is between 20 degrees and 60 degrees.

As a further improvement of the present invention, the second side surface comprises a first partial area which is substantially flat and a second partial area which is substantially flat, and the first partial area and the second partial area are not smoothly continuous.

As a further improvement of the present invention, a plane parallel to the substrate surface is used as a reference plane, and a first angle between the first partial region and the reference plane is between 20 ° and 55 °; the second angular value of the second partial region relative to the reference plane is between 25 ° and 70 °.

As a further improvement of the present invention, the projection dimension H of each microstructure on the horizontal extension plane of the substrate and the ratio of the distance D between two adjacent microstructures is between 1: 0.5 to 1: 3, or more; the distance C from the intersection point of the first side surface and the second side surface to the intersection end point of the second side surface and the surface of the substrate forming the microstructure is 1-8 times of H.

As a further development of the invention, the first side extends along a plane substantially perpendicular to the substrate surface.

The utility model discloses an on the other hand provides an optical module, include: a light source, a plurality of optical films, and a light control plate as described above, which may be integrated within the optical films or located outside the optical films.

Another aspect of the present invention provides a display device, including: a display panel; and a light control panel as previously described.

The utility model has the advantages that: the embodiment of the utility model provides an optical control board, including the base plate with be located the periodic distribution's of a surface of base plate at least microstructure, every microstructure is asymmetric microstructure or the symmetrical microstructure who forms by asymmetric microstructure, incident light passes through the regulating action of microstructure on the optical control board, changes the required output light distribution of light path formation, for example widen the horizontal direction on the left and right sides or control the ascending visual angle of certain side direction, restrain the ascending visual angle of vertical side, can be used to on-vehicle display system, thereby can avoid showing that the image maps to windshield influences driver's sight, just the utility model discloses a endow the shape that has optical characteristic element to the base plate, simple structure, processing cost is lower.

Drawings

Fig. 1 is a schematic structural diagram of an optical control panel according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of an optical control panel according to another embodiment of the present invention;

fig. 3 is a schematic structural diagram of an asymmetric microstructure according to an embodiment of the present invention;

FIGS. 4a and 4b are diagrams of light paths obtained by theoretical calculation when the microstructure is an asymmetric microstructure;

FIGS. 5a, 5b and 5c are graphs of light paths obtained by theoretical calculation when the microstructure is a symmetrical microstructure;

FIG. 6 is a diagram of the optical simulation result of viewing angle when the optical microstructure is a symmetrical microstructure;

FIG. 7 is a waveform of relative brightness versus viewing angle distribution and a waveform of prior art relative brightness versus viewing angle distribution when the microstructure is a symmetric microstructure;

fig. 8 is a schematic structural diagram of an optical module according to an embodiment of the present invention.

The following description is made with reference to the accompanying drawings:

10-light control panel; 11-a substrate;

111-a first surface; 112-second surface;

12-microstructure; 121 — asymmetric microstructure;

1211 — first side; 1212-second side;

120-vertex; 1212 a-first partial region;

1212 b-second partial region; 122-transition point;

123-end point; 20-optical module;

21-optical film; 22-light guide plate.

Detailed Description

A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

The light control panel may be used to control the light output distribution to meet specific viewing angle requirements of the display system, for example, in an on-vehicle display system, the viewing angle range in the Y direction needs to be suppressed to avoid the display image being mapped to the windshield to affect the driver's view. Meanwhile, the visual angle range in the X direction is expanded, so that a driver can conveniently watch the display content with the same brightness from the auxiliary driving viewpoint. Fig. 1 is a schematic structural diagram of an optical control plate 10 provided by an embodiment of the present invention, as shown in fig. 1, the optical control plate 10 includes a substrate 11, the substrate 11 has a first surface 111 and a second surface 112, and the second surface 112 is disposed away from the first surface 111; the plurality of microstructures 12 are periodically disposed on at least one surface of the substrate 11, such as the first surface 111 of the embodiment, but in other embodiments, the plurality of microstructures may be disposed on the second surface 112, or disposed on the first surface 111 and the second surface 111. It should be understood that the term "disposed on at least one surface of the substrate 11" as used herein specifically refers to a plurality of microstructures 12 formed on the surface of the substrate 11, and for example, the plurality of microstructures 12 may be formed by processing the surface of the substrate 11 in an inward concave manner, or the plurality of microstructures 12 may be formed by processing the surface of the substrate 11 in an outward convex manner. Each microstructure 12 includes at least one asymmetric microstructure 121, and specifically, as shown in fig. 1, in an embodiment of the present invention, the microstructure 12 is an asymmetric microstructure 121, and a plurality of asymmetric microstructures 121 are periodically disposed on a surface of the substrate 11, such as the first surface 111. In other embodiments of the present invention, for example, as shown in fig. 2, the microstructure 12 is a symmetrical microstructure formed by two asymmetrical microstructures 121 disposed face to face, and the symmetrical microstructures are periodically disposed on one surface of the substrate 11, for example, the first surface 111.

In some embodiments of the present invention, the asymmetric microstructures 121 are, for example, linear microstructures, extending on one surface of the substrate 11 along a direction parallel to one side of the substrate 11, and the plurality of asymmetric microstructures 121 have substantially the same cross-sectional shape. The asymmetric microstructure 121 includes a first side 1211 and a second side 1212, where the first side 1211 and the second side 1212 intersect at the vertex 120, the first side 1211 is substantially flat, and the first side 1211 extends along a plane substantially perpendicular to the surface of the substrate 11, so as to facilitate processing on the one hand, and achieve better control of light distribution on the other hand. The second side 1212 is non-flat, as shown in fig. 1, and in one embodiment of the present invention, the second side 1212 is convexly curved to obtain a desired light output distribution. The angle α between the second side 1212 and the first side 1211 at the vertex 120 is between 20 ° and 60 °.

In another embodiment of the present invention, as shown in fig. 3, the second side surface 1212 includes a first portion area 1212a being substantially flat and a second portion area 1212b being substantially flat, the first portion area 1212a and the second portion area 1212b are not smoothly continuous, and a transition point 122 is located between the first portion area 1212a and the second portion area 1212 b. The first partial region 1212a extends from the apex 120 to the transition point 122, and the second partial region 1212b extends from the transition point 122 toward the surface of the substrate 11 on which the microstructure is arranged. The first angle value a between the first partial region 1212a and the reference plane is between 20 ° and 55 ° with the plane parallel to the surface of the substrate 11 as the reference plane; a second angle B of the second subregion 1212B to the reference plane lies between 25 ° and 70 °.

In some embodiments of the present invention, as shown in fig. 1 and fig. 2, if the projection size of each microstructure 12 on the horizontal extension plane of the substrate 11 is referred to as H, and the distance (interval) between two adjacent microstructures 12 is referred to as D, the relationship between the two sizes satisfies that the ratio of H to D is between 1: 0.5 to 1: 3, the test result shows that if the size relationship between H and D is not in the range, the brightness peak value will deviate from the preset result greatly, and if the size relationship between H and D is in the range, the preset emergence angle value can be obtained; the length C of the second side surface 1212, specifically, the distance from the vertex 120 where the first side surface 1211 and the second side surface 1212 intersect to the endpoint 123 where the second side surface 1212 and the surface of the substrate 11 where the microstructure is disposed intersect, is 1 to 8 times the length H. Further, specific values of H, D, and C are not particularly limited, and any suitable values may be set according to the preset exit angle characteristics.

Specifically, the substrate 11 may have any suitable thickness between 0.05mm and 5mm, for example, and the material of the substrate 11 may be a transparent resin, such as one or more of PMMA, PC, PET, and COP. When the plurality of microstructures 12 are formed by recessing the surface of the substrate 11, the microstructures 12 may be formed by, for example, a UV-hardening resin molding method, an injection molding method, a thermal transfer method, a shape-forming extrusion molding method, or the like, and may be formed by cutting a resin directly. When the plurality of microstructures 12 are formed by protruding outward from the surface of the substrate 11, for example, the plurality of microstructures 12 may be formed first, and the plurality of microstructures 12 may be arranged on the surface of the substrate 11 periodically by bonding. When the microstructures 12 are formed at one surface of the substrate 11, the other surface of the substrate 12 may be a mirror surface, a metal-processed surface, or a prism surface.

Fig. 4a and 4b are ray path diagrams obtained by theoretical calculation when the microstructure is an asymmetric microstructure, and fig. 5a, 5b and 5c are ray path diagrams obtained by theoretical calculation when the microstructure is a symmetric microstructure, as shown in fig. 4a and 4b, it can be seen that after light rays are incident to the light control plate from different angles, through the adjusting action of the asymmetric microstructure, emergent light is mainly distributed on one side of the horizontal direction, so that the visual angle of one side of the left and right sides of the horizontal direction is widened, the visual angle of the other side is suppressed, and therefore when the display device is enlarged to be extended to the copilot side, the light control plate which only widens the visual angle of one side can be adopted, and the predicted problem that the displayed image is mapped to the side glass to influence the visual line is avoided. If it is desired to distribute the output light to the left and right sides in the horizontal direction, the microstructures 12 are symmetrical microstructures, which may be, for example, two asymmetrical microstructures 121 disposed face to face, specifically, the second side surfaces 1212 of two asymmetrical microstructures 121 face to face, more specifically, the second side surfaces 1212 of two asymmetrical microstructures 121 are close to each other and coincide with each other at the intersection end point 123 of the surface of the substrate 11 where the microstructures are disposed, and the first side surfaces 1211 of two asymmetrical microstructures 121 are far away from each other, as shown in fig. 5a, 5b and 5c, when the microstructures 12 are symmetrical microstructures, after the light enters the light control plate from different angles, the emitted light has a wider light distribution at both left and right sides through the adjustment effect of the symmetrical microstructures.

Fig. 6 is an optical simulation result diagram of a viewing angle when the optical microstructure is a symmetrical microstructure, fig. 7 is a waveform diagram of relative brightness distributed along with an angle and a waveform diagram of relative brightness distributed along with an angle in the prior art when the microstructure is a symmetrical microstructure, wherein, in fig. 7, 71(x) represents the waveform diagram of relative brightness distributed along with an angle in the horizontal direction of the present invention, 71(y) represents the waveform diagram of relative brightness distributed along with an angle in the vertical direction of the present invention, 72(x) represents the waveform diagram of relative brightness distributed along with an angle in the horizontal direction in the prior art, and 72(y) represents the waveform diagram of relative brightness distributed along with an angle in the vertical direction in the prior art. As shown in fig. 6 and 7, when the microstructures of the light control plate are symmetrical microstructures, the brightness at the center in the horizontal direction and the brightness at the wide angles at the left and right sides are substantially the same, which is reflected in the waveform diagram, i.e., the waveform at the horizontal direction has a flat top with a certain width relative to the brightness along with the angular distribution, which indicates that the viewing angle in the horizontal direction is wider, and the viewing angle at a position deviated from the center in the horizontal direction to a certain extent has substantially the same brightness as the central viewing angle, so that in a specific application, such as a vehicle-mounted display system, a driver and a co-driver can view the display content with the same brightness.

Another aspect of the present invention provides an optical module, as shown in fig. 8, generally, the optical module 20 includes a plurality of optical films 22 such as a diffusion sheet and a prism sheet; the light guide plate 23 further includes the light control plate 10, and the light control plate 10 may be located on an outer side of the optical film away from the light guide plate or an inner side facing the light guide plate, for example, but not limited thereto, and the light control plate 10 may also be located at other positions of the optical module 20. It will be appreciated that the optical module 20 may also include one or more light sources, such as light emitting diodes, or cold cathode fluorescent tubes (CCFLs) or incandescent lamps, and further that the light sources may be of the direct or edge type.

Another aspect of the present invention provides a display device, which includes a display panel and an optical control panel 10, wherein the display panel is, for example, a Liquid Crystal Display (LCD) panel or an OLED display panel, and when the display panel is a liquid crystal display panel, the display device further includes a backlight module, and the optical control panel can be integrated in the backlight module or located in the external side of the backlight module, for example, located in the external side of the polarizer. When the display panel is an OLED display panel, the light control panel may be located at one side of the OLED display panel without a backlight module due to self-luminescence.

In the previous description, numerous specific details were set forth in order to provide a thorough understanding of the invention. The foregoing description is only illustrative of the preferred embodiments of the invention, which can be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. While the invention has been described with reference to specific embodiments, it will be apparent to one skilled in the art that various changes and modifications can be made, and equivalents employed, without departing from the scope of the invention. All the contents that do not depart from the technical solution of the present invention, any simple modification, equivalent change and modification made to the above embodiments according to the technical substance of the present invention all still belong to the protection scope of the technical solution of the present invention.

Claims

1. An optical control panel, comprising:

a substrate having a first surface and a second surface;

a plurality of microstructures periodically arranged on at least one surface of the substrate;

each microstructure comprises at least one asymmetric microstructure;

wherein the asymmetric microstructure comprises a first side and a second side, the first side being substantially flat and the second side being non-flat.

2. The light control panel of claim 1, wherein: each microstructure is an asymmetric microstructure or a symmetric microstructure formed by two asymmetric microstructures arranged face to face.

3. The light control panel of claim 1, wherein: the second side surface is a convex curved surface.

4. The light control panel of claim 3, wherein: the angle between the first side surface and the second side surface is between 20 DEG and 60 deg.

5. The light control panel of claim 1, wherein: the second side surface comprises a first partial area which is basically flat and a second partial area which is basically flat, and the first partial area and the second partial area are not smoothly continuous.

6. The light control board of claim 5, wherein: taking a plane parallel to the surface of the substrate as a reference plane, wherein a first angle value between the first partial area and the reference plane is between 20 degrees and 55 degrees; the second angular value of the second partial region relative to the reference plane is between 25 ° and 70 °.

7. The light control panel of claim 1, wherein: the ratio of the projection dimension H of each microstructure on the horizontal extension plane of the substrate to the distance D between two adjacent microstructures is 1: 0.5 to 1: 3, or more; and the distance C from the intersection point of the first side surface and the second side surface to the intersection end point of the second side surface and the surface of the substrate forming the microstructure is 1-8 times of H.

8. The light control panel of claim 1, wherein: the first side extends along a plane substantially perpendicular to the substrate surface.

9. An optical module, comprising: a light source, a plurality of optical films, and the light control plate of any of claims 1-8, the light control plate being either integrated within the optical films or external to the optical films.

10. A display device, comprising:

a display panel; and

a light control panel as claimed in any one of claims 1-8.