TWI769492B - Light field controlling film set and viewing angle switchable display device - Google Patents

Abstract

A light field controlling film set includes a first optical film and liquid crystal molecules. The first optical film includes a transparent substrate and a light field controlling microstructure. The transparent substrate has a light entrance side and a light exit side, and the light field control microstructure is disposed at the light exit side. Each light field control microstructure has two side facets, and the two side facets are oriented in the opposite direction. An optical layer is disposed on one of the two side facets, and the optical layer includes a light absorbing layer, a light reflecting layer, or/and a light diffusing layer The liquid crystal molecules are disposed in the light field controlling microstructure. A viewing angle switchable display device includes the light field controlling film set. The light field controlling film set and the viewing angle switchable display device are beneficial to improving driving safety while adopted in the vehicle display system.

Description

Light field control diaphragm group and display device with variable viewing angle

The present invention relates to the field of light field control and display, in particular to a light field control film set and a display device with variable viewing angle.

Current vehicle displays In the future, the number and area of vehicle displays will be greatly increased with the improvement of wireless communication technology, the popularization of electric vehicles, and the multi-purpose display area of instruments, and the display content will also become more diversified. That is, the disturbance to the driving driver will be more serious and needs to be avoided. Therefore, the control requirement of the display angle of the display in the driving state has become more and more important, so that the driver and the occupant can watch the appropriate display content without mutual interference. You can fully enjoy the rich viewing content brought by the display device while driving.

In order to achieve the control function of the current display, the display panel needs to be equipped with complex backlight control (such as double-layer or LED Light bar with different light-emitting angles), double-layer liquid crystal glass or light-absorbing grating Films (non-adjustable) are used to limit the light-emitting angle of the panel to achieve the effect of narrow viewing angle or wide viewing angle. However, regardless of the above technical structure, the achievable viewing angle control characteristics are all in a single dimension and are symmetrical under the adjustable dimension. This characteristic In the automotive environment, there are limitations in its use. For example, when the display position is close to the front windshield, although the left and right viewing angles can be controlled (single dimension), the up and down viewing angles cannot be effectively limited at the same time, and it is easy to be blocked in the wind. glass production reflections, which interfere with driving vision at night. Or, because the viewing angle adjustment can only be a single-dimensional symmetrical control, when the car turns on the display while driving, both the front and passenger seats will receive the control effect of the display panel with a narrow viewing angle or a wide viewing angle at the same time, and the co-pilot can watch the display. At the same time as the content is displayed, the display screen can also be viewed while driving, which is likely to cause driving interference and cause driving danger.

This "Prior Art" paragraph is only used to help understand the content of the present invention, so the content disclosed in the "Prior Art" may contain some that do not constitute the prior art known to those of ordinary skill in the art. In addition, the content disclosed in the "Prior Art" does not represent the content or the problems to be solved by one or more embodiments of the present invention, nor does it represent that it has been known by those with ordinary knowledge in the technical field before the application of the present invention. know or know.

The present invention provides a light field control diaphragm group and a display device with variable viewing angle, which are beneficial to improve driving safety.

Other objects and advantages of the present invention can be further understood from the technical features disclosed in the present invention.

To achieve one or part or all of the above purposes or other purposes, the light field control film set provided by the present invention includes a first optical film and liquid crystal molecules. The first optical film includes a first transparent base material and a light field control microstructure, the first transparent base material has a first light incident side and a first light exit side, the light field control microstructure is arranged on the first light exit side, and each light field The control microstructure has two sides, the two sides face opposite directions, and one side of the two sides is provided with an optical layer, and the optical layer is selected from a light absorption layer, a light reflection layer, a light diffusion layer and a combination thereof. Liquid crystal molecules are arranged in each light field control microstructure.

In an embodiment of the present invention, the above-mentioned light field control microstructures are distributed on the first light emitting side in a linear manner, and the linear manner includes straight lines or curves.

In an embodiment of the present invention, the above-mentioned light field control microstructures are distributed on the first light emitting side in a two-dimensional array.

In an embodiment of the present invention, each of the light field control microstructures on the side cross section intersecting with the first transparent substrate as described above is in a triangular, trapezoidal, rectangular or fan shape.

In an embodiment of the present invention, each of the above-mentioned light field control microstructures is a triangular pyramid, a quadrangular pyramid, a cubic trapezoid, a cubic rectangle, a cone or a cylinder.

In an embodiment of the present invention, the above-mentioned first optical film further includes a first transparent conductive layer and a second transparent conductive layer, the first transparent conductive layer is disposed on the first light emitting side, and the light field control microstructure is disposed between the second transparent conductive layer and the first transparent conductive layer.

In an embodiment of the present invention, the above-mentioned light field control film group further includes a second optical film, the second optical film is disposed on a side of the light field control microstructure away from the first light emitting side, and the second optical film The sheet is a fixed haze type light diffusing sheet, and the fixed haze type light diffusing sheet has a fixed haze, and the fixed haze is 1% to 99%.

In an embodiment of the present invention, the above-mentioned light field control film set further includes a second optical film, the second optical film is disposed on a side of the light field control microstructure away from the first light emitting side, and the liquid crystal molecules include a second optical film. A liquid crystal molecule and a second liquid crystal molecule, the first liquid crystal molecule is arranged in each light field control microstructure, and the second liquid crystal molecule is arranged in the second optical film.

In an embodiment of the present invention, the above-mentioned first optical film further includes a first transparent conductive layer and a second transparent conductive layer, the first transparent conductive layer is disposed on the first light emitting side, and the light field control microstructure is disposed Between the first transparent conductive layer and the second transparent conductive layer, the second optical film is disposed on the side of the second transparent conductive layer away from the light field control microstructure, and the second optical film further comprises a transparent motherboard, a third The transparent conductive layer and the fourth transparent conductive layer, the third transparent conductive layer and the fourth transparent conductive layer are respectively arranged on opposite sides of the transparent motherboard, and the third transparent conductive layer is located between the transparent motherboard and the second transparent conductive layer. between.

In an embodiment of the present invention, the second liquid crystal molecules and the second optical film form an adjustable haze type light diffusing sheet, and the adjustable haze type light diffusing sheet has a variable haze, and the variable haze is between 1 % to 99%.

In order to achieve one or part or all of the above purposes or other purposes, the display device with variable viewing angle provided by the present invention includes a display module and the above-mentioned light field control film group, and the light field control film is arranged on the display module. one side.

In the light field control film set and the display device with variable viewing angle of the present invention, by arranging the optical layer on one of the two sides of the light field control microstructure and arranging liquid crystal molecules in the light field control microstructure, It can achieve the effect of controlling the range of the asymmetric light field in at least one dimension, so as to avoid the nighttime driving vision interference caused by the reflection of the windshield, and the driving driving caused by the driver and co-pilot can watch the display content of the display device at the same time. Distraction and other factors that endanger driving safety, thereby improving driving safety.

In order to make the above-mentioned and other objects, features and advantages of the present invention more clearly understood, preferred embodiments are hereinafter described in detail in conjunction with the accompanying drawings.

100, 100M, 100N: light field control diaphragm group

110, 110D, 110G, 110N: the first optical film

111: The first transparent substrate

112, 112A, 112B, 112C, 112D, 112E, 112F, 112G, 112H, 112I, 112J, 112K, 112L, 112M, 112N: Light Field Controlled Microstructures

113, 113E, 113F, 113G: Optical layer

114: the first transparent conductive layer

115, 115M: the second transparent conductive layer

116, 116M, 116N: the second transparent substrate

120, 120N: Liquid crystal molecules

121N: the first liquid crystal molecule

122N: the second liquid crystal molecule

130M, 130N: The second optical film

131N: Transparent Motherboard

132N: The third transparent conductive layer

133N: the fourth transparent conductive layer

200, 300: Display device

210, 310: Display module

220: Light source module

B1: first ray

B2: Second Ray

LI1: The first light incident side

LI2, LI2M: the second light incident side

LO1, LO1G, LO1M: the first light-emitting side

LO2, LO2M, LO2N: the second light output side

S1, S2, S1E, S2E, S1F, S2F, S1G, S2G, S1H, S2H, S1I, S2I, S1J, S2J, S1K, S2K, S1L, S2L: Side

S1G1, S1G2, S1H1, S1H2, S1I1, S1I2, S1J1, S1J2: Secondary side

1 is a schematic cross-sectional view of a light field control film set according to an embodiment of the present invention; FIG. 2 is a schematic appearance diagram of a first optical film of the light field control film set according to an embodiment of the present invention, wherein the second transparent conductive film is omitted. layer and the second transparent substrate; FIG. 3 is a schematic diagram of the light path of the light field control microstructure according to an embodiment of the present invention; FIG. 4A is a cross-sectional schematic diagram of the light field control microstructure according to an embodiment of the present invention; FIG. 4B is the present invention A cross-sectional schematic diagram of a light field control microstructure according to an embodiment; FIG. 4C is a cross-sectional schematic diagram of a light field control microstructure according to an embodiment of the present invention; 5A is a schematic diagram of light traveling in a driving voltage state of the light field control film set according to an embodiment of the present invention, wherein the liquid crystal molecules are in the first optical state; FIG. 5B is a light field control film set in another embodiment of the present invention. Schematic diagram of light traveling in the driving voltage state, wherein the liquid crystal molecules are in the second optical state; FIG. 6 is a schematic view of the appearance of the first optical film of the light field control film group according to an embodiment of the present invention, wherein the second transparent conductive layer and the second transparent conductive layer are omitted. The second transparent substrate; FIG. 7 is a schematic diagram of the light path of the light field control microstructure according to an embodiment of the present invention; FIG. 8 is a schematic diagram of the light path of the light field control microstructure according to an embodiment of the present invention; A schematic view of the appearance of the first optical film of the light field control film group of the embodiment, wherein the first transparent conductive layer, the second transparent conductive layer and the second transparent substrate are omitted; FIG. 10 is a light field according to an embodiment of the present invention Figure 11A is a schematic diagram of the appearance of a light field control microstructure according to an embodiment of the present invention; Figure 11B is a schematic appearance diagram of a light field control microstructure according to an embodiment of the present invention; FIG. 11D is a schematic appearance diagram of a light field control microstructure according to an embodiment of the present invention; FIG. 11E is a schematic appearance diagram of a light field control microstructure according to an embodiment of the present invention; FIG. 12 FIG. 13 is a schematic cross-sectional view of a light field control film set according to an embodiment of the present invention; FIG. 14 is a display with variable viewing angle according to an embodiment of the present invention. 15A is a schematic diagram of a use of the display device with variable viewing angle in FIG. 14; FIG. 15B is another schematic diagram of use of the display device with variable viewing angle in FIG. 14; and FIG. 16 is an embodiment of the present invention A schematic cross-sectional view of an example of a display device with variable viewing angle.

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. The directional terms mentioned in the following embodiments, such as: up, down, left, right, front or rear, etc., are only for referring to the directions of the attached drawings. Accordingly, the directional terms used are illustrative and not limiting of the present invention.

FIG. 1 is a schematic cross-sectional view of a light field control diaphragm set according to an embodiment of the present invention. FIG. 2 is a schematic view of the appearance of the first optical film of the light field control film group according to an embodiment of the present invention. 3 is a schematic diagram of a light path of a light field control microstructure according to an embodiment of the present invention. Please refer to FIGS. 1 to 3 , the light field control film set 100 of this embodiment includes a first optical film 110 and a plurality of liquid crystal molecules 120 . The first optical film 110 includes a first transparent substrate 111 and several light field control microstructures 112 . The first transparent substrate 111 has a first light incident side LI1 and a first light output side LO1, and the light field control microstructure 112 is disposed on the first light output side LO1. Each light field control microstructure 112 has two side surfaces S1 and S2 facing in opposite directions, and one side surface S1 is provided with an optical layer 113 . In addition, the above-mentioned first transparent substrate 111 and the light field control microstructure 112 can be made of a light-transmitting polymer material such as polymethyl methacrylate (PMMA), but the invention is not limited thereto.

Continuing the above description, the light field control microstructure 112 can be in the shape of a long strip; in this embodiment, the long strip is, for example, a straight strip, and the light field control microstructure 112 is parallel to each other on the first light emitting side LO1 arranged, but the present invention is not limited thereto. In addition, in this embodiment, as shown in FIG. 1 , on the cross section intersecting with the first transparent substrate 111 , each light field control microstructure 112 presents a triangle, but the invention is not limited thereto. 4A to 4C are schematic cross-sectional views of light field control microstructures according to other embodiments of the present invention. Referring to FIGS. 4A to 4C , in other embodiments, the light field control microstructures 112A, 112B, and 112C may also be represented as trapezoids ( FIG. 4A ), rectangles ( FIG. 4A ), and rectangles ( FIG. 4A ). 4B) or sector (central angle between 0° and 180°, Figure 4C).

Continuing the above description, in this embodiment, the optical layer 113 is, for example, a light absorbing layer, but the present invention is not limited thereto. Referring to FIG. 3, light enters the light field control microstructure 112 and reaches the light field control The opposite sides S1 and S2 of the microstructure 112 are fabricated. For the convenience of description, the two sides S1 and S2 of the light field control microstructure 112 are hereinafter referred to as the first side S1 and the second side S2, the optical layer 113 is arranged on the first side S1, and the light reaching the first side S1 is called as the first side S1 and the second side S2. The first light ray B1, the light ray reaching the second side surface S2 is called the second light ray B2. After reaching the first side S1, the first light B1 is absorbed by the optical layer 113 and cannot pass through the first side S1. After reaching the second side S2, the second light B2 can penetrate the second side S2 and leave the light field control microstructure 112. That is to say, the first side S1 and the second side S2 have different optical properties by the arrangement of the optical layer 113, so that the light passing through the first optical film 110 presents an asymmetric light field, so as to achieve an asymmetric viewing angle control. In addition, in this embodiment, since the light field control microstructures 112 are elongated and arranged parallel to each other, the light field control film set 100 of this embodiment can achieve asymmetric viewing angle control in a single dimension.

Continuing the above description, in this embodiment, the liquid crystal molecules 120 are disposed in the light field control microstructure 112 . The liquid crystal molecules 120 are, for example, cholesteric liquid crystals or polymer-dispersed liquid crystals. In addition, the first optical film 110 further includes a first transparent conductive layer 114 and a second transparent conductive layer 115. The first transparent conductive layer 114 is disposed on the first light-emitting side LO1, and the light field control microstructure 12 is disposed on the second light-emitting side LO1. between the transparent conductive layer 115 and the first transparent conductive layer 114 . The liquid crystal molecules 120 have a first optical state and a second optical state. When a driving voltage is provided to the first transparent conductive layer 114 and the second transparent conductive layer 115, an electric field is formed between the first transparent conductive layer 114 and the second transparent conductive layer 115, and the electric field switches the liquid crystal molecules 120 from the first optical state to the second optical state. FIG. 5A and FIG. 5B are schematic diagrams of light traveling in different driving voltage states of the light field control film set according to an embodiment of the present invention, respectively. Referring to FIG. 5A , when the first transparent conductive layer 114 and the second transparent conductive layer 115 are not energized, because the liquid crystal molecules 120 are in the first optical state in which the liquid crystal molecules 120 are randomly arranged, the refractive index distribution is anisotropic. A scattering phenomenon occurs, so that the asymmetric light field range after the light passes through the first optical film 110 is expanded; please refer to FIG. 5B , when the first transparent conductive layer 114 and the second transparent conductive layer 115 are energized, the liquid crystal molecules 120 are aligned in an orientation The second optical state presents an isotropic state of refractive index distribution, and the light passes through There is no scattering phenomenon in the past, so that the asymmetric light field range after the light passes through the first optical film 110 remains unchanged.

Continuing the above description, in this embodiment, the light field control film set 100 may further include a second transparent substrate 116, and the second transparent substrate 116 has a second light incident side LI2 and a second light output side LO2, and the light field control The microstructure 112 is disposed between the second light incident side LI2 and the first light exit side LO1, and the second transparent conductive layer 115 is disposed between the second transparent substrate 116 and the light field control microstructure 112 and is located on the second light incident side on LI2. After the light passes through the light field control microstructure 112, it can further pass through the second transparent conductive layer 115 and enter the second transparent substrate 116 from the second light incident side LI2; The light-emitting side LO2 leaves the second transparent substrate 116 .

6 is a schematic view of the appearance of the first optical film of the light field control film group according to an embodiment of the present invention. Referring to FIG. 6 , in this embodiment, the light field control microstructure 112D of the first optical film 110D is in the shape of a curved strip.

FIG. 7 is a schematic diagram of a light path of a light field control microstructure according to an embodiment of the present invention. Referring to FIG. 7 , in this embodiment, the optical layer 113E is, for example, a light reflection layer. The first light B1 reaches the first side S1E and is reflected by the optical layer 113E, the reflected first light B1 advances toward the second side S2E, and together with the second light B2 penetrates the second side S2E and leaves the light field control micro Structure 112E; that is to say, the first side S1E and the second side S2E have different optical properties by the arrangement of the optical layer 113E (light reflection layer), so that the light shows an asymmetric light field after passing through the first optical film , to achieve asymmetric viewing angle control.

FIG. 8 is a schematic diagram of a light path of a light field control microstructure according to an embodiment of the present invention. Please refer to FIG. 8 , in this embodiment, the optical layer 113F is, for example, a light diffusion layer. The first light B1 leaves the light field control microstructure 112F in a scattered manner after reaching the first side S1F, and the second light B2 penetrates the second side S2F and leaves the light field control microstructure 112F. The first side is made of the light diffusing layer The surface S1F and the second side surface S2F have different optical properties, so that the light passes through the first optical film to present an asymmetric light field, thereby achieving asymmetric viewing angle control.

9 is a schematic top view of the first optical film of the light field control film group according to an embodiment of the present invention. 10 is a schematic diagram of a light path of a light field control microstructure according to an embodiment of the present invention. Referring to FIGS. 9 and 10 , in this embodiment, the light field control microstructures 112G are block-shaped and distributed on the first light emitting side LO1G in an array manner. Each light field control microstructure 112G is in the shape of a triangular pyramid in three-dimensional space, and the first side S1G of each light field control microstructure 112G is composed of two adjacent secondary side surfaces S1G1 and S1G2, and the secondary side surfaces S1G1 and S1G2 may be referred to as The first secondary side surface S1G1 and the second secondary side surface S1G2, that is, the first secondary side surface S1G includes the first secondary side surface S1G1 and the second secondary side surface S1G2, and the optical layer 113G is disposed on the first secondary side surface S1G1 and the second secondary side surface S1G2. The three sides of each light field control microstructure 112G in the shape of a triangular pyramid are the first side surface S1G1, the second side surface S1G2 and the second side surface S2G. Accordingly, each light field control microstructure 112G in the shape of a triangular pyramid is Optical layers 113G are disposed on two of the three sides of the . In addition, for example, the optical layer 113G in this embodiment may be a light absorbing layer, but the invention is not limited thereto; in other embodiments, the optical layer 113G may also be a light reflecting layer or a light diffusing layer.

Continuing the above description, in this embodiment, the first light B1 is absorbed by the optical layer 113 after reaching the first side S1G1 and the second side S1G2 of the first side S1G, and cannot pass through the first side S1G of the first side S1G. The side S1G1 and the second side S1G2, the second light B2 can penetrate the second side S2G and leave the light field control microstructure 112G after reaching the second side S2G; S1G and the second side surface S2G have different optical properties, so that the light passing through the first optical film 110G presents an asymmetric light field, so as to achieve asymmetric viewing angle control. In addition, in this embodiment, since the light field control microstructures 112G are distributed on the first light emitting side LO1G in an array manner, the light field control film set of this embodiment can achieve asymmetric viewing angle control in more than two dimensions .

Continuing the above description, in some embodiments, the optical layer 113G may only be disposed on the first secondary side S1G1 of the first side S1G or the second secondary side S1G2 of the first side S1G, that is, each of the triangular pyramid-shaped The optical layer 113G is disposed on only one of the three sides of the light field control microstructure 112G. For example, the optical layer 113G is only disposed on the first secondary side S1G1 of the first side S1G: the first light B1 is absorbed by the optical layer 113G after reaching the first secondary side S1G1 of the first side S1G, and cannot pass through the first side On the first side S1G1 of S1G, the first light B1 can penetrate the second side S1G2 of the first side S1G after reaching the second side S1G2 of the first side S1G and leave the light field control microstructure 112G, and the second light B2 After reaching the second side S2G, it can penetrate the second side S2G and leave the light field control microstructure 112G. This configuration can also achieve the effect of asymmetric viewing angle control.

11A to 11E are schematic appearance diagrams of light field control microstructures according to other embodiments of the present invention. Referring to FIGS. 11A to 11E , in other embodiments, each of the light field control microstructures 112H, 112I, 112J, 112K, 112L can also appear in a three-dimensional space, such as a quadrangular pyramid ( FIG. 11A ), a cubic trapezoid ( FIG. 11B ) , cubic-rectangular (FIG. 11C), conical (FIG. 11D), or cylindrical (FIG. 11E).

Continuing the above description, please refer to FIGS. 11A to 11C , in the embodiment in which the light field control microstructures 112H, 112I and 112J are in the shape of a quadrangular pyramid, a cubic trapezoid and a cubic rectangle in a three-dimensional space, the light field control microstructures 112H, 112H, The first side surfaces S1H, S1I, and S1J of 112I and 112J are composed of the adjacent first side surfaces S1H1, S1I1, and S1J1 and the second side surfaces S1H2, S1I2, and S1J2. The second side surfaces S2H, S2I, S2J are composed of the adjacent third side surfaces S2H1, S2I1, S2J1 and the fourth side surfaces S2H2, S2I2, S2J2, that is, the first side surfaces S1H, S1I, S1J include the first side surfaces S1H1, S1I1, S1J1 and the second side S1H2, S1I2, S1J2, the second side S2H, S2I, S2J includes the third side S2H1, S2I1, S2J1 and the fourth side S2H2, S2I2, S2J2, in the shape of a quadrangular cone, cubic trapezoid and the four sides of each light field control microstructure 112H, 112I, 112J of the cubic rectangle are the first side surfaces S1H1, S1I1, S1J1, the second side S1H2, S1I2, S1J2, the third side S2H1, S2I1, S2J1 and the fourth side S2H2, S2I2, S2J2. Optical layers (not shown) can be disposed on the first secondary side surfaces S1H1 , S1I1 , S1J1 and the second secondary side surfaces S1H2 , S1I2 , and S1J2 . After the first light reaches the first side S1H1, S1I1, S1J1 and the second side S1H2, S1I2, S1J2 of the first side S1H, S1I, S1J, it is absorbed by the optical layer and cannot pass through the first side S1H, S1I, S1J The first side S1H1, S1I1, S1J1 and the second side S1H2, S1I2, S1J2, the second light reaches the third side S2H1, S2I1, S2J1 of the second side S2H, S2I, S2J and the fourth side S2H2, S2I2, S2J2 can penetrate the third side S2H1, S2I1, S2J1 of the second side S2H, S2I, S2J and the fourth side S2H2, S2I2, S2J2, so as to achieve the effect of asymmetric viewing angle control.

Continuing the above description, in some embodiments, when the light field control microstructures 112H, 112I, 112J are in the shape of a quadrangular pyramid, a cubic trapezoid, or a cubic rectangle in three-dimensional space, the optical layer may also be configured only for the first time. On the side S1H1, S1I1, S1J1. The first light rays reaching the first side surfaces S1H1, S1I1, and S1J1 of the first side surfaces S1H, S1I, and S1J are absorbed by the optical layer and cannot pass through the first side surfaces S1H1, S1I1, and S1J1 of the first side surfaces S1H, S1I, and S1J. The first light rays reaching the second side surfaces S1H2, S1I2, and S1J2 of the first side surfaces S1H, S1I, and S1J penetrate the second side surfaces S1H2, S1I2, and S1J2, and the second light rays reach the third side surfaces of the second side surfaces S2H, S2I, and S2J. The secondary side S2H1, S2I1, S2J1 and the fourth side S2H2, S2I2, S2J2 can penetrate the third side S2H1, S2I1, S2J1 of the second side S2H, S2I, S2J and the fourth side S2H2, S2I2, S2J2, In this way, the effect of asymmetrical viewing angle control is achieved. In still other embodiments, when the light field control microstructures 112H, 112I, and 112J are in the shape of a quadrangular pyramid, a cubic trapezoid, or a cubic rectangle in a three-dimensional space, the optical layer may only be disposed on the second secondary side surface S1H2, On S1I2, S1J2. The first light rays reaching the second side S1H2, S1I2, S1J2 of the first side S1H, S1I, S1J are absorbed by the optical layer and cannot pass through the second side S1H2, S1I2, S1J2 of the first side S1H, S1I, S1J, The first rays reaching the first sides S1H1, S1I1, S1J1 of the first sides S1H, S1I, S1J After penetrating the first side S1H1, S1I1, S1J1, the second light reaches the third side S2H1, S2I1, S2J1 and the fourth side S2H2, S2I2, S2J2 of the second side S2H, S2I, S2J and can penetrate the second side The third side S2H1, S2I1, S2J1 of the side S2H, S2I, S2J and the fourth side S2H2, S2I2, S2J2, so as to achieve the effect of asymmetrical viewing angle control.

Continuing the above description, please refer to FIGS. 11D and 11E , in the embodiment in which the light field control microstructures 112K and 112L are conical and cylindrical in three-dimensional space, the first side surface S1K of each light field control microstructure 112K and 112L is , S1L and the second side surfaces S2K, S2L form conical and cylindrical arc-shaped side surfaces.

FIG. 12 is a schematic cross-sectional view of a light field control diaphragm set according to an embodiment of the present invention. Referring to FIG. 12 , the difference between the light field control film set 100M of this embodiment and the light field control film set 100 of FIG. 1 is that the light field control film set 100M of this embodiment further includes a second optical film 130M, the second optical film 130M is disposed on a side of the light field control microstructure 112M away from the first light emitting side LO1M, and the second transparent conductive layer 115M and the second transparent substrate 116M are located on the second optical film 130M and the light field. Between the control microstructures 112M; further, the second optical film 130M is disposed on the second light emitting side LO2M of the second transparent substrate 116M, and the second transparent conductive layer 115M is disposed on the second side of the second transparent substrate 116M On the LI2M on the light-incident side. The second optical film 130M is, for example, a fixed haze type light diffusing sheet, that is, the haze value of the second optical film 130M is a specific value. The haze value of the second optical film 130M may be 1% to 99%, for example: 1%, 2%, 10%, 25%, 50%, 75%, 90%, 95% or 99%. After the light leaves the second transparent substrate 116M from the second light emitting side LO2M, it can further pass through the second optical film 130M. The range of the asymmetric light field can be further adjusted by the second optical film 130M. However, if the performance of the light field meets the requirements, in the embodiment in which the liquid crystal molecules 120 are only disposed in the optical control microstructure 112 of the first optical film 110, such as the embodiment shown in FIG. The second optical film 130M in the embodiment shown in 12.

FIG. 13 is a schematic cross-sectional view of a light field control diaphragm set according to an embodiment of the present invention. Please refer to FIG. 13 , the difference between the light field control film set 100N of this embodiment and the light field control film set 100M of FIG. 12 is that the liquid crystal molecules 120N are disposed on the light field control microstructure 112N and the second optical film at the same time 130N to control the range of the asymmetric light field. Further, the liquid crystal molecules 120N include first liquid crystal molecules 121N and second liquid crystal molecules 122N. The first liquid crystal molecules 121N are disposed in the light field control microstructure 112N, and the second liquid crystal molecules 122N are disposed in the second optical film 130N. The second optical film 130N includes a transparent motherboard 131N, a third transparent conductive layer 132N and a fourth transparent conductive layer 133N. The transparent motherboard 131N is disposed on the second light emitting side LO2N of the second transparent substrate 116N, and the third transparent conductive layer 132N and the fourth transparent conductive layer 133N are respectively disposed on opposite sides of the transparent motherboard 131N, and the third transparent conductive layer 132N is located between the transparent motherboard 131N and the second light emitting side LO2N of the second transparent substrate 116N, The two liquid crystal molecules 122N are disposed in the transparent motherboard 131N. When a driving voltage is supplied to the third transparent conductive layer 132N and the fourth transparent conductive layer 133N, an electric field is formed between the third transparent conductive layer 132N and the fourth transparent conductive layer 133N, and the electric field makes the second liquid crystal molecules 122N from the first optical state Switch to the second optical state. When the third transparent conductive layer 132N and the fourth transparent conductive layer 133N are not energized, because the second liquid crystal molecules 122N are in the first optical state in which they are randomly arranged, the refractive index distribution is anisotropic. When the light passes through the second optical film 130N, a scattering phenomenon occurs, so that the range of the asymmetric light field formed by the light passing through the second optical film 130N is further expanded (compared to the light passing through the first optical film 110N). The resulting asymmetric light field range). When the third transparent conductive layer 132N and the fourth transparent conductive layer 133N are energized, the second liquid crystal molecules 122N are in a second optical state in which they are aligned, showing an isotropic state of refractive index distribution, and the light passing through the first optical film 110N passes through There is no scattering phenomenon when the second optical film 130N is generated, so that the asymmetric light field range formed after the light passes through the second optical film 130N remains unchanged (compared to the non-uniform light field formed after the light passes through the first optical film 110N). Symmetric light field range).

Continuing the above description, in this embodiment, the second liquid crystal molecules 122N of the liquid crystal molecules 120N are disposed in the second optical film 130N to form a light diffusion sheet. The change between the first optical state and the second optical state causes the haze value of the light diffusing sheet to vary within a range, which is not a specific value, that is, the light diffusing sheet has a varying haze. Accordingly, the light diffusion sheet formed by the second liquid crystal molecules 122N arranged on the second optical film 130N is an adjustable haze type light diffusion sheet. In this embodiment, the variable haze of the adjustable haze type light diffusing sheet ranges from 1% to 99%, for example: 2% to 50%, 2% to 75%, 2% to 95%, 25% to 50% %, 25% to 75%, 25% to 95%, 50% to 75%, 50% to 95% or 75% to 95%. Accordingly, in this embodiment, the range of the asymmetric light field is further adjusted by disposing the second liquid crystal molecules 122N on the second optical film 130N.

14 is a schematic cross-sectional view of a display device with a variable viewing angle according to an embodiment of the present invention. 15A and 15B are schematic diagrams of the use of the display device with variable viewing angle in FIG. 14 . Please refer to FIGS. 1 , 14 , 15A and 15B. The display device 200 with variable viewing angle of this embodiment includes a display module 210 and a light field control film set 100 . The light field control film set 100 is disposed on one side of the display module 210 . In this embodiment, the display module 210 is a liquid crystal display module, and the display device with variable viewing angle further includes a light source module 220 , and the light field control film set 100 is disposed between the display module 210 and the light source module 220 . and the light source module 220 is located on the first light incident side LI1 of the first optical film 110 of the light field control film group 100 . The light source module 220 includes, for example, a light bulb or a light emitting diode. The light provided by the light source module 220 can enter the first optical film 110 through the first light incident side LI1 , and exhibit an asymmetric light field effect by the light field control microstructure 112 and the optical layer 113 . At the same time, the effect of adjusting the range of the asymmetric light field is achieved by the action of the liquid crystal molecules 120 of the light field control diaphragm group 100 . As shown in FIGS. 15A and 5B , when the first transparent conductive layer 114 and the second transparent conductive layer 115 are energized, the liquid crystal molecules 120 are in a second optical state in which they are aligned, showing an isotropic state of refractive index distribution, and no light is generated when passing through. Scattering phenomenon, so that the asymmetric light field range after the light passes through the first optical film 110 maintains the first angle degree α, the first angle α is, for example, 80°. As shown in FIGS. 15B and 5A , when the first transparent conductive layer 114 and the second transparent conductive layer 115 are not energized, because the liquid crystal molecules 120 are in the first optical state in which they are randomly arranged, the refractive index distribution is unequal. A scattering phenomenon will occur when passing through, so that the asymmetric light field range of the light passing through the first optical film 110 is changed to a second angle β, and the second angle β is, for example, 150°. Although the display device with variable viewing angle of FIGS. 14 , 15A and 15B is exemplified by the light field control film set 100 of FIG. 1 , the light field control film set of the display device with variable viewing angle of FIGS. 14 , 15A and 15B 100 can also be replaced with the light field control diaphragm sets 100M and 100N of any of the above embodiments.

16 is a schematic cross-sectional view of a display device with a variable viewing angle according to an embodiment of the present invention. Please refer to FIGS. 1 and 16 , the display device 300 with variable viewing angle of this embodiment includes a display module 310 and a light field control film set 100 . The light field control film set 100 is disposed on one side of the display module 310 . In this embodiment, the display module 310 is a self-luminous display module, the self-luminous display module includes an organic light emitting diode, and the display module 310 is located on the first optical film 110 of the light field control film group 100 . A light incident side LI1. The light provided by the display module 310 can enter the first optical film 110 through the first light incident side LI1 , and exhibit an asymmetric light field effect by the light field control microstructure 112 and the optical layer 113 . At the same time, the effect of adjusting the range of the asymmetric light field is achieved by the action of the liquid crystal molecules 120 of the light field control diaphragm group 100 . Although the display device with variable viewing angle in FIG. 16 uses the light field control film set 100 in FIG. 1 as an example, the light field control film set 100 in the display device with variable viewing angle in FIG. 16 can also be replaced with any one of the above The light field control diaphragm sets of the embodiment are 100M and 100N.

To sum up, the light field control film set and the display device with variable viewing angle according to the embodiments of the present invention can be applied to a vehicle display system. In the light field control film set and the display device with variable viewing angle according to the embodiment of the present invention, the optical layer is arranged on one of the two sides of the light field control microstructure and the liquid crystal molecules are arranged on the light field control microstructure. , it can achieve the effect of controlling the asymmetric light field range in at least one dimension, so as to avoid night driving vision derived from windshield reflections Interference, driving distraction of the driver derived from the driver and co-pilot can watch the display content of the display device at the same time and other factors that endanger the driving safety, thereby improving the driving safety.

However, the above are only preferred embodiments of the present invention, and should not limit the scope of the present invention, that is, any simple equivalent changes and modifications made according to the scope of the patent application of the present invention and the contents of the description of the invention, All still fall within the scope of the patent of the present invention. In addition, any embodiment of the present invention or the scope of the claims is not required to achieve all of the objects or advantages or features disclosed herein. In addition, the abstract section and the title are only used to aid the search of patent documents and are not intended to limit the scope of the present invention. In addition, terms such as "first", "second", "third", and "fourth" mentioned in this specification or the scope of the patent application are only used to name elements or to distinguish different embodiments or scopes. , rather than an upper or lower limit on the number of components.

100: Light field control diaphragm group

110: The first optical film

111: The first transparent substrate

112: Light Field Controlled Microstructures

113: Optical layer

114: the first transparent conductive layer

115: the second transparent conductive layer

116: Second transparent substrate

120: Liquid crystal molecules

LI1: The first light incident side

LI2: The second light incident side

LO1: The first light-emitting side

LO2: The second light-emitting side

S1, S2: side

Claims (11)

A light field control film set includes a first optical film and several liquid crystal molecules, wherein: the first optical film includes a first transparent substrate and a plurality of light field control microstructures, the first optical film The transparent substrate has a first light incident side and a first light exit side, the light field control microstructures are disposed on the first light exit side, the light field control microstructures are made of light-transmitting polymer materials, and each of the light field control microstructures is made of light-transmitting polymer material. Some light field control microstructures have two sides, the two sides face opposite directions, an optical layer is configured on one side of the two sides, and the optical layer is selected from a light absorbing layer, a light reflecting layer, a light diffusing layer and combinations thereof and the liquid crystal molecules are arranged in each of the light field control microstructures, wherein the liquid crystal molecules and the optical layer are separated by a part of each of the light field control microstructures. The light field control film set of claim 1, wherein the light field control microstructures are distributed on the first light emitting side in a linear manner, and the linear manner includes straight lines or curves. The light field control film set of claim 1, wherein the light field control microstructures are distributed on the first light emitting side in a two-dimensional array. The light field control film set according to claim 1, wherein on a cross section of a side intersecting with the first transparent substrate, each of the light field control microstructures presents a triangle, a trapezoid, a rectangle or a fan shape. The light field control diaphragm set according to claim 1, wherein each of the light field control microstructures is a triangular pyramid, a quadrangular pyramid, a cubic trapezoid, a cubic rectangle, a cone or a cylinder. The light field control film set of claim 1, wherein the first optical film further comprises a first transparent conductive layer and a second transparent conductive layer, and the first transparent conductive layer is disposed on the first light emitting side and the light field control microstructures are disposed between the second transparent conductive layer and the first transparent conductive layer. The light field control film set according to claim 1, wherein the light field control film set further comprises a second optical film, and the second optical film is disposed on the light field control microstructures away from the first light output On one side of the side, the second optical film is a fixed haze type light diffusing sheet, and the fixed haze type light diffusing sheet has a fixed haze, and the fixed haze is 1% to 99%. The light field control film set according to claim 1, wherein the light field control film set further comprises a second optical film, and the second optical film is disposed on the light field control microstructures away from the first light output On one side of the side, the liquid crystal molecules include several first liquid crystal molecules and several second liquid crystal molecules, the first liquid crystal molecules are arranged in each of the light field control microstructures, and the second liquid crystal molecules are arranged in in the second optical film. The light field control film set according to claim 8, wherein the first optical film further comprises a first transparent conductive layer and a second transparent conductive layer, and the first transparent conductive layer is disposed on the first light emitting side and the light field control microstructures are disposed between the first transparent conductive layer and the second transparent conductive layer, the second optical film is disposed on the second transparent conductive layer away from the light field control microstructures On one side, the second optical film further includes a transparent mother board, a third transparent conductive layer and a fourth transparent conductive layer, the third transparent conductive layer and the fourth transparent conductive layer are respectively disposed on the transparent mother board On opposite sides of the board, the third transparent conductive layer is located between the transparent mother board and the second transparent conductive layer. The light field control film set according to claim 8, wherein the second liquid crystal molecules and the second optical film form an adjustable haze type light diffusion sheet, and the adjustable haze type light diffusion sheet has A variable haze, the variable haze is between 1% and 99%. A display device with variable viewing angle, comprising a display module and a light field control film set as described in any one of claims 1 to 10, the light field control film being arranged on one side of the display module .

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