CN111308727A - Display device - Google Patents

Abstract

The invention provides a display device, which comprises an imaging element, a planar surface light source and a polarized light separation element, wherein the planar surface light source is used for providing a plurality of illuminating light beams, the normal of the planar surface light source and the normal of the imaging element have a non-vertical configuration relation, the polarized light separation element is arranged between the planar surface light source and the imaging element and has a geometric cylindrical surface, the illuminating light beams from the planar surface light source are projected onto the polarized light separation element and are reflected, the illuminating light beams advance towards the imaging element, and the imaging light beams from the imaging element pass through the polarized light separation element to enable images to be presented outwards. The invention can make the illumination beam uniformly irradiate on the imaging surface of the imaging element within a certain visual angle, and the element is easy to manufacture and has low cost.

Description

display device

technical field

The present invention relates to the field of optics, in particular to a display device.

Background technique

With the advent of the multimedia information (Multimedia) and network (Internet) era, the exchange of images and information is increasing rapidly, and various new display technologies have emerged. Along with the development of these display technologies, various display technologies are continuously proposed to solve and respond to different problems faced by various display applications.

Among them, the reflective liquid crystal display has become one of the mainstream of the development of display technology due to its advantages of low power consumption and visibility in sunlight. The imaging and display quality of the display plays an important role. Therefore, the US patents with the publication numbers of US6433935, US6976759 and US7529029 all discuss the lighting system applied to the reflective liquid crystal display.

Please refer to FIG. 1 , which is a schematic diagram of a lighting system provided by US Patent Publication No. US6433935. The illumination beam provided by the light source 11 is incident on the wedge prism 12 and totally reflected therein to enlarge the area and viewing angle of the reflective liquid crystal display 13 . However, the above-mentioned illumination method will cause chromatic aberration on the image exit surface 14 and cause optical axis skew and image deformation, which is not conducive to the application of subsequent imaging.

Please refer to FIG. 2 , which is a schematic diagram of a polarization separation assembly (PBS assembly) provided by US Patent Publication No. US6976759. The illumination beam 21 provided by the light-emitting source enters the prism 20 and is first projected to the prism surface 22 and undergoes total reflection, and then travels in the direction of the polarization separation surface 23 , and the illumination beam 21 projected to the polarization separation surface 23 is then transmitted from the polarization separation surface 23 . It is reflected on the prism surface 22 that originally generated total reflection and penetrates the prism surface 22, and then irradiates the imaging surface of the reflective light valve 27. Finally, the illumination beam irradiated on the imaging surface of the reflective light valve 27 21 will be converted into an imaging beam 26, and the imaging beam 26 will pass through the prism surface 22, the polarization separation surface 23 and the compensation prism 24 in sequence and then output to the outside. Among them, the compensation prism 24 can guide the optical axis of the imaging beam 26 to make the imaging beam 26 output along the normal direction of the reflective light valve 27, but even so, the setting of the compensation prism 24 will increase the thickness of the whole assembly, so that the The distance between the imaging surface of the reflective light valve 27 and the light-emitting surface 25 increases, which is not conducive to miniaturization and matching with a short-focus optical system.

Please refer to FIG. 3 , which is a schematic diagram of an image display system provided by US Patent Publication No. US7529029. The polarization separation prism 32 of the image display system 30 is designed with a curved surface 34 and a curved surface 35, which can be used not only to guide the optical path of the illumination beam 36 from the light source 31 to the reflective light valve 33, but also to guide the imaging beam 36' The optical path output from the reflective light valve 33 is therefore a combination of illumination elements and imaging elements. However, the combination of the lighting element and the imaging element requires the production of a curved prism with a complex surface shape, and the curved prism also needs to have a high surface accuracy, and the allowable tolerance of the assembly must be controlled within a certain range to ensure the overall imaging quality. .

As can be seen from the above description, the conventional display device has room for improvement.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to provide a display device that can make the illumination beam uniformly irradiate on the imaging surface of the imaging element within a certain viewing angle, and the element is easy to manufacture and low in cost, aiming at the above-mentioned shortcomings of the prior art. device.

The technical solution adopted by the present invention to solve the technical problem is to provide a display device including an imaging element, a planar surface light source and a polarization separation element, the imaging element has an imaging plane for providing an image; the plane The type surface light source has a light-emitting surface for providing a plurality of illumination beams, and a normal line of the light-emitting surface and a normal line of the imaging surface are in a non-perpendicular configuration relationship; the polarization separation element is arranged on the flat surface. There is a geometric cylinder between the light source and the imaging element, and the geometric cylinder is for at least part of the illumination beam from the plane surface light source and belonging to a first polarization to be projected onto it and reflected, so that the At least part of the illumination beam belonging to the first polarization goes toward the direction of the imaging element; wherein, any of the illumination beams belonging to the first polarization is projected to the imaging element and then exits the imaging element. It is converted into an imaging beam belonging to a second polarization, and the geometric cylinder also allows at least part of the imaging beam from the imaging element and belonging to the second polarization to pass therethrough to make the image appear outward.

Preferably, when the half length of one side of the imaging surface is less than 2.75 millimeters (mm), the display device complies with the following relationship:

-0.047385X _i ² +0.771625X _i +3.4≤Y _i ;

Y _i ≤-0.047385X _i ² +0.771625X _i +5;

Y _i =M _i -N _i ; and

69°≤θ _t≤78 °;

Wherein, X _i is a position defined on the imaging plane according to a coordinate axis, and the coordinate axis is parallel to the side of the imaging plane and perpendicular to the normal of the imaging plane, and _Mi is the The position on the imaging surface extends up to the geometric cylinder along the normal line of the imaging surface, and _Ni is the position on the imaging surface that extends up to the geometric cylinder along the normal line of the imaging surface. A separation distance of an upper surface of the imaging element, θ _t is an included angle between the normal line of the imaging surface and the normal line of the light-emitting surface.

Preferably, the display device also conforms to one of the following relational expressions (a1) to (a6):

(a1) When X _i =0, 3.6≤Y _i <3.8;

(a2) When X _i =0, 3.8≤Y _i <4.0;

(a3) When X _i =0, 4.0≤Y _i <4.2;

(a4) When X _i =0, 4.2≤Y _i <4.4;

(a5) when X _i =0, 4.4≤Y _i <4.6; and

(a6) When X _i =0, 4.6≤Y _i <4.8.

Preferably, when the half length of one side of the imaging surface is greater than 2.75 millimeters (mm) and less than 3.5 millimeters (mm), the display device complies with the following relationship:

-0.043299X _i ² +0.745345X _i +4≤Y _i ;

Y _i ≤-0.043299Xi ² +0.745345X _i +6;

Y _i =M _i -N _i ; and

68.5°≤θ _t ≤82.5°;

Wherein, X _i is a position defined on the imaging plane according to a coordinate axis, and the coordinate axis is parallel to the side of the imaging plane and perpendicular to the normal of the imaging plane, and _Mi is the The position on the imaging surface extends up to the geometric cylinder along the normal line of the imaging surface, and _Ni is the position on the imaging surface that extends up to the geometric cylinder along the normal line of the imaging surface. A separation distance of an upper surface of the imaging element, θ _t is an included angle between the normal line of the imaging surface and the normal line of the light-emitting surface.

Preferably, the display device also conforms to one of the following relational expressions (b1) to (b8):

(b1) When X _i =0, 4.2≤Y _i <4.4;

(b2) When X _i =0, 4.4≤Y _i <4.6;

(b3) When X _i =0, 4.6≤Y _i <4.8;

(b4) When X _i =0, 4.8≤Y _i <5.0;

(b5) When X _i =0, 5.0≤Y _i <5.2;

(b6) When X _i =0, 5.2≤Y _i <5.4;

(b7) when X _i =0, 5.4≤Y _i <5.6; and

(b8) When X _i =0, 5.6≤Y _i <5.8.

Preferably, the imaging element includes an upper cover glass, an intermediate layer and a circuit board, and the intermediate layer is located between the upper cover glass and the circuit board; wherein, the imaging surface is located in the intermediate layer, and the intermediate layer is located in the intermediate layer. The upper surface of the imaging element is the upper surface of the upper cover glass.

Preferably, the imaging plane has a position defined according to a coordinate axis, and the coordinate axis is parallel to one side of the imaging plane and perpendicular to the normal of the imaging plane; wherein, the imaging plane An interval distance that the position on the image plane extends upward to the geometric cylinder along the normal line of the imaging plane should be larger as the position on the imaging plane moves toward an axial direction of the coordinate axis.

Preferably, the imaging surface is rectangular, and the side of the imaging surface is a short side of the imaging surface.

Preferably, the planar surface light source includes a substrate, a plurality of light-emitting diodes and a diffuser, and the plurality of light-emitting diodes are arranged on the substrate and provide a plurality of light beams, and the plurality of light beams pass through the diffuser. form a light source.

Preferably, the flat surface light source includes a light chamber, at least one light-emitting diode and a diffuser, and the at least one light-emitting diode and the diffuser are located at two ends of the light chamber, respectively; A light emitting diode is used to provide a plurality of light beams, and the plurality of light beams travel in the light chamber and are projected and diffusely reflected to the diffusion sheet, and form a light source after passing through the diffusion sheet.

Preferably, the flat surface light source includes at least one light emitting diode and a light guide plate, and the at least one light emitting diode is used to provide a plurality of light beams, and the light guide plate is used for projecting the plurality of light beams therein to guide the The travel of these light beams makes the plurality of light beams form a light source after passing through the light guide plate.

Preferably, the planar surface light source further includes a polarizer for the complex light beams to pass therethrough to output the complex illumination light beams belonging to the first polarization.

Preferably, the imaging element is a single crystal silicon reflective liquid crystal (LCoS) element.

Preferably, the polarization separation element is a reflective polarizer or a reflective polarizer (Dual Brightness Enhancement Film, DBEF).

Preferably, the polarized light separation element is in the form of a thin film.

The present invention also provides a display device, comprising an imaging element, a flat surface light source and a polarization separation element, the imaging element has an imaging surface for providing an image; the flat surface light source is used for providing a plurality of illumination beams The polarized light separation element is arranged between the planar surface light source and the imaging element, for at least part of the illumination beam from the planar surface light source and belonging to a first polarization to be projected onto it and reflected, Make at least part of the illumination beam belonging to the first polarization to travel in the direction of the imaging element, and also allow at least part of the imaging beam from the imaging element and belonging to a second polarization to pass therethrough to make the image appear outward ; wherein, the imaging surface has a position defined according to a coordinate axis, and the coordinate axis is parallel to one side of the imaging surface and perpendicular to a normal of the imaging surface, and the imaging surface is The position along the normal line of the imaging plane extends upward to the polarized light separation element with an interval distance that should be larger as the position on the imaging plane moves toward an axial direction of the coordinate axis.

Preferably, the planar surface light source has a light-emitting surface, and a normal line of the light-emitting surface and the normal line of the imaging surface are in a non-perpendicular configuration relationship.

Preferably, when the half length of the side of the imaging surface is less than 2.75 millimeters (mm), the display device complies with the following relationship:

-0.047385Xi ² +0.771625X _i +3.4≤Y _i ;

Y _i ≤-0.047385Xi ² +0.771625X _i +5;

Y _i =M _i -N _i ; and

69°≤θ _t≤78 °;

Wherein, X _i is the position defined on the imaging plane according to the coordinate axis, and M _i is the position on the imaging plane extending upward along the normal line of the imaging plane to the interval of the polarization separation element distance, _Ni is the distance from the position on the imaging surface extending upward along the normal line of the imaging surface to an upper surface of the imaging element, θ _t is the normal line of the imaging surface and the light-emitting surface an angle between the normals of .

Preferably, the display device also conforms to one of the following relational expressions (a1) to (a6):

(a1) When X _i =0, 3.6≤Y _i <3.8;

(a2) When X _i =0, 3.8≤Y _i <4.0;

(a3) When X _i =0, 4.0≤Y _i <4.2;

(a4) When X _i =0, 4.2≤Y _i <4.4;

(a5) when X _i =0, 4.4≤Y _i <4.6; and

(a6) When X _i =0, 4.6≤Y _i <4.8.

Preferably, when the half length of the side of the imaging surface is greater than 2.75 millimeters (mm) and less than 3.5 millimeters (mm), the display device complies with the following relationship:

-0.043299Xi ² +0.745345X _i +4≤Y _i ;

Y _i ≤-0.043299Xi ² +0.745345X _i +6;

Y _i =M _i -N _i ; and

68.5°≤θ _t ≤82.5°;

Wherein, X _i is the position defined on the imaging plane according to the coordinate axis, and M _i is the position on the imaging plane extending upward along the normal line of the imaging plane to the interval of the polarization separation element distance, _Ni is the distance from the position on the imaging surface extending upward along the normal line of the imaging surface to an upper surface of the imaging element, θ _t is the normal line of the imaging surface and the light-emitting surface an angle between the normals of .

Preferably, the display device also conforms to one of the following relational expressions (b1) to (b8):

(b1) When X _i =0, 4.2≤Y _i <4.4;

(b2) When X _i =0, 4.4≤Y _i <4.6;

(b3) When X _i =0, 4.6≤Y _i <4.8;

(b4) When X _i =0, 4.8≤Y _i <5.0;

(b5) When X _i =0, 5.0≤Y _i <5.2;

(b6) When X _i =0, 5.2≤Y _i <5.4;

(b7) when X _i =0, 5.4≤Y _i <5.6; and

(b8) When X _i =0, 5.6≤Y _i <5.8.

Preferably, the imaging element includes an upper cover glass, an intermediate layer and a circuit board, and the intermediate layer is located between the upper cover glass and the circuit board; wherein, the imaging surface is located in the intermediate layer, and the intermediate layer is located in the intermediate layer. The upper surface of the imaging element is the upper surface of the upper cover glass.

Preferably, the planar surface light source includes a substrate, a plurality of light-emitting diodes and a diffuser, and the plurality of light-emitting diodes are arranged on the substrate and provide a plurality of light beams, and the plurality of light beams pass through the diffuser. form a light source.

Preferably, the flat surface light source includes a light chamber, at least one light-emitting diode and a diffuser, and the at least one light-emitting diode and the diffuser are located at two ends of the light chamber, respectively; A light emitting diode is used to provide a plurality of light beams, and the plurality of light beams travel in the light chamber and are projected and diffusely reflected to the diffusion sheet, and form a light source after passing through the diffusion sheet.

Preferably, the planar surface light source includes at least one light emitting diode and a light guide plate, and the at least one light emitting diode is used to provide a plurality of light beams, and the plurality of light beams form a light source after passing through the light guide plate.

Preferably, the planar surface light source further includes a polarizer for the complex light beams to pass therethrough to output the complex illumination light beams belonging to the first polarization.

Preferably, the imaging surface is rectangular, and the side of the imaging surface is a short side of the imaging surface.

Preferably, the imaging element is a single crystal silicon reflective liquid crystal (LCoS) element.

Preferably, the polarization separation element is a reflective polarizer or a reflective polarizer (Dual Brightness Enhancement Film, DBEF).

Preferably, the polarized light separation element is in the form of a thin film.

The polarized light separation element of the display device of the present invention has a geometric cylinder, and the geometric cylinder of the polarized light separation element and the upper cover glass of the imaging element have a specific distance distribution and are matched with a specific inclination angle of the flat surface light source, so that the flat surface light source The provided illumination beam can evenly illuminate the imaging surface of the imaging element within a specific viewing angle, and can also shorten the distance between the imaging surface of the imaging element and the polarization separation element, thereby reducing the overall thickness and volume of the display device. In addition, since the polarization separation element of the display device of the present invention does not require injection molding or grinding of precise optical elements, nor does it need to match precise optical elements, the display device of the present invention has the advantages of simple fabrication and low cost.

Description of drawings

Fig. 1 is a schematic diagram of a lighting system provided by US Patent Publication No. US6433935.

FIG. 2 is a schematic diagram of a polarized light separation assembly (PBS assembly) provided by US Patent Publication No. US6976759.

FIG. 3 is a schematic diagram of an image display system provided by US Patent Publication No. US7529029.

FIG. 4 is a schematic structural diagram of a display device of the present invention in a preferred embodiment.

FIG. 5 is a conceptual schematic diagram of the imaging element of the display device shown in FIG. 4 and the viewing angle of several pixels on the imaging surface thereof.

FIG. 6 is a schematic diagram of an optical path of the display device shown in FIG. 4 .

FIG. 7 is a conceptual schematic diagram showing that the flat surface light source of the first embodiment is applied to the display device shown in FIG. 4 .

FIG. 8 is a schematic three-dimensional conceptual diagram of a partial structure of the planar surface light source shown in FIG. 7 .

FIG. 9 is a conceptual diagram illustrating the application of the planar surface light source of the second embodiment to the display device shown in FIG. 4 .

FIG. 10 is a conceptual schematic diagram illustrating that the flat surface light source of the third embodiment is applied to the display device shown in FIG. 4 .

FIG. 11 is a schematic diagram of a geometrical concept of the display device shown in FIG. 4 marked with a coordinate system.

FIG. 12 is a conceptual schematic diagram of the distribution of multiple positions on the imaging surface shown in FIG. 4 for calculating the illuminance uniformity.

Detailed ways

Please refer to FIGS. 4 to 6. FIG. 4 is a schematic diagram of the structure of the display device of the present invention in a preferred embodiment, and FIG. 5 is the imaging element of the display device shown in FIG. 4 and the viewing angle of several pixels on the imaging surface. A schematic diagram of a concept, FIG. 6 is a schematic diagram of an optical path of the display device shown in FIG. 4 . The display device 4 includes an imaging element 41, a flat surface light source 42, and a polarization separation element 43, and the imaging element 41 has an imaging surface 414 for providing an image, and the flat surface light source 42 has a light-emitting surface for providing a plurality of illumination beams L1 421 , wherein the normal line of the light-emitting surface 421 of the planar surface light source 42 and the normal line of the imaging surface 414 of the imaging element 41 are in a non-perpendicular configuration relationship.

Furthermore, the polarization separation element 43 is disposed between the planar surface light source 42 and the imaging element 41 and has a geometric cylindrical surface 431, and the geometric cylindrical surface 431 supplies the illumination beam L1 from the planar surface light source 42 and belonging to the first polarized polarity. It is projected onto it and reflected, so that the illumination beam L1 belonging to the first polarization goes toward the direction of the imaging element 41 , and the illumination beam L1 belonging to the first polarization is projected to the imaging surface 414 of the imaging element 41 and then reflected The imaging beam is formed, and the imaging beam exits the imaging element 41 and is converted into an imaging beam L2 belonging to the second polarization, and the imaging beam L2 belonging to the second polarization travels in the direction of the polarization separation element 43, and passes through the polarization separation element 43. The geometric cylinder surface 431 of the polarized light separation element 43 is outputted to the outside so that the image is presented to the outside. The illumination beam L1 belonging to the first polarization has an incident angle θ _i when projected to any pixel of the imaging surface 414 of the imaging element 41 , and the illumination beam L1 belonging to the first polarization is imaged on the imaging element 41 After the surface 414 reflects and exits the imaging element 41, an imaging light beam L2 belonging to the second polarized polarity and having a reflection angle θ _r equal to the incident angle θ _i will be formed. Therefore, the viewing angle θ _V of any pixel can be determined by the illumination light beam L1. depends on the incident angle θ _i incident thereon, which is shown in FIG. 5 .

In this preferred embodiment, the imaging element 41 is a single crystal liquid crystal silicon (LCoS) element, and includes an upper cover glass 411, a circuit board 413, and an intermediate layer 412 between the upper cover glass 411 and the circuit board 413, and The intermediate layer 412 includes an electrode layer, a liquid crystal layer, an alignment layer, a reflective layer, a silicon crystal layer, etc., which are known to those of ordinary skill in the art, and will not be repeated here, and the imaging surface 414 is located in the intermediate layer 412 and a rectangle. In addition, in this preferred embodiment, the polarized light separation element 43 is in the form of a thin film, which can be a reflective polarizer or a reflective polarizer (Dual Brightness Enhancement Film, DBEF), and its geometric cylindrical surface 431 is a surface with curvature in only one axis.

Three embodiments of the planar surface light source 42 are listed below. Please refer to FIG. 7 and FIG. 8 . FIG. 7 is a conceptual schematic diagram of the flat surface light source of the first embodiment applied to the display device shown in FIG. 4 , and FIG. 8 is a three-dimensional concept of a partial structure of the flat surface light source shown in FIG. 7 Schematic. The planar surface light source 42A of the first embodiment includes a substrate 422, a plurality of light-emitting diodes 423A, a diffuser 424A, and a polarizer 425A. The light-emitting diodes 423A are arranged on the substrate 422 in a two-dimensional array, and The plurality of light beams L provided by the light emitting diodes 423A will be scattered when projected on the diffuser 424A, so that the light beams L can form a uniform surface light source after passing through the diffuser 424A. Finally, the light beams L pass through the diffuser 424A. After the polarizer 425A, a complex illumination beam L1 of the first polarized polarity is formed; wherein, the setting of the polarizer 425A can prevent part of the light beam L passing through the diffuser 424A from directly penetrating the polarization separation element 43, thereby reducing stray light and improving the display device 4 However, the polarizer 425A is not a necessary implementation element of the planar surface light source 42A.

Please refer to FIG. 9 , which is a conceptual schematic diagram of the application of the planar surface light source of the second embodiment to the display device shown in FIG. 4 . The planar surface light source 42B of the second embodiment includes a light chamber 426, at least one light emitting diode 423B, a diffuser 424B and a polarizer 425B, and the light emitting diode 423B is located at one end of the light chamber 426, and the diffuser 424B and the The polarizer 425B is located at the other end of the light chamber 426, wherein the plurality of light beams L provided by at least one light emitting diode 423B will travel in the light chamber 426 and produce reflection and diffusion on the inner surface layer 4261 of the light chamber 426 for many times. Reflected to project to the diffuser 424B, and the light beams L are also scattered in the diffuser 424B, so that the light beams can form a uniform surface light source after passing through the diffuser. Finally, the light beams L pass through the polarizer 425B. Then, the complex illumination beam L1 of the first polarization is formed; wherein, the setting of the polarizer 425B can prevent part of the beam L passing through the diffuser 424B from directly penetrating the polarization separation element 43, thereby reducing stray light and improving the contrast and contrast of the display device 4. The display effect is shown, but the polarizer 425B is not a necessary implementation element of the planar surface light source 42B.

Please refer to FIG. 10 , which is a conceptual schematic diagram of applying the planar surface light source of the third embodiment to the display device shown in FIG. 4 . The planar surface light source 42C of the third embodiment includes at least one light emitting diode 423C, a light guide plate 427 and a polarizer 425C, and the plurality of light beams L provided by the light emitting diode 423C are guided into the light guide plate 427 when projected into the light guide plate 427 The light plate 427 is guided to perform multiple total reflections and scattering, so that the light beams L can form a uniform surface light source after passing through the light guide plate 427. Finally, the light beams L pass through the polarizer 425C to form a first polarizer The polarizer 425C is arranged to prevent the partial light beam L emitted by the light guide plate 427 from directly penetrating the polarization separation element 43, thereby improving the contrast and display effect of the display device 4, but the polarizer 425C is not a A necessary implementation element of the planar surface light source 42C.

Of course, the above are only examples, and the implementation of the imaging element and its imaging surface, the implementation of the polarization separation element and its geometric cylinder, and the implementation of the planar surface light source are not limited to the above. Those skilled in the art can make any equivalent design changes according to actual application requirements.

In particular, the present invention designs the geometric cylinder 431 of the polarized light separation element 43 and the upper cover glass 411 of the imaging element 41 to have a specific distance distribution, and is matched with a specific inclination angle of the flat surface light source 42, so that the flat surface light source The illumination light beam L1 provided by 42 can be uniformly irradiated on the imaging surface 414 of the imaging element 41 within a specific viewing angle _θV . In one embodiment, the display device further includes a light-transmitting carrier (not shown), and the light-transmitting carrier has an optical curved surface corresponding to the geometric cylinder surface 431 of the polarization separating element 43 for the polarization separating element 43 to be arranged. on it; wherein, the light-transmitting carrier can be formed by grinding glass or plastic, but not limited to the above.

The relative relationship between the distance distribution between the geometric cylinder surface 431 of the polarization separation element 43 and the upper cover glass 411 of the imaging element 41 and the inclination angle of the planar surface light source 42 will be further described below. Please refer to FIG. 11 , which is a schematic diagram of a geometric concept of the display device shown in FIG. 4 marked with a coordinate system. In the coordinate system shown in FIG. 11 , the first coordinate axis (X axis) is parallel to one side of the imaging surface 414 of the imaging element 41 (in this embodiment, the side refers to the short side of the imaging surface 414 ). 4141, see FIG. 4, but not limited thereto) and perpendicular to the normal of the imaging plane 414, and the origin _X0 of the first coordinate axis (X axis) is located at the midpoint of the short side 4141 of the imaging plane 414, and the first coordinate axis (X axis) The axial direction of one coordinate axis (X axis) is the direction toward the planar surface light source 42 . Also, in the coordinate system shown in FIG. 11 , the second coordinate axis (Y axis) is parallel to the normal of the imaging surface 414 of the imaging element 41 , and the origin Y ₀ of the second coordinate axis (Y axis) is located at the imaging element 41 (ie, the upper surface 4111 of the upper cover glass 411 ), and the axial direction of the second coordinate axis (Y-axis) is the direction toward the polarization separation element 43 .

Furthermore, there is an included angle θ _t between the normal of the imaging surface 414 of the imaging element 41 and the normal of the light-emitting surface 421 of the planar surface light source 42 , and any position G _i on the imaging surface 414 of the imaging element 41 can be determined according to The first coordinate axis (X axis) is defined as X _i , and the separation distance of the position G _i extending up to the geometric cylinder surface 431 of the polarization separation element 43 along the normal of the imaging plane 414 can be defined as M _i , and the distance from the position G _i that extends upward along the normal of the imaging surface 414 to the upper surface of the imaging element 41 (ie, the upper surface of the upper cover glass 411 ) can be defined as _Ni ; wherein, the imaging of the imaging element 41 The half length of the short side 4141 of the surface 414 is dX, and when the half length dX of the short side 4141 of the imaging surface 414 is less than 2.75 millimeters (mm), the display device 4 complies with the following relational expressions (1) to (4):

(1)-0.047385X _i ² +0.771625X _i +3.4≤Y _i ;

(2)Y _i ≤-0.047385X _i ² +0.771625X _i +5;

(3) Y _i =M _i -N _i ; and

(4) 69°≤θ _t≤78 °;

And when the half length dX of the short side 4141 of the imaging surface 414 is greater than 2.75 millimeters (mm) and less than 3.5 millimeters (mm), the display device 4 complies with the following relational expressions (5) to (8):

(5)-0.043299X _i ² +0.745345X _i +4≤Y _i ;

(6) Y _i ≤-0.043299X _i ² +0.745345X _i +6;

(7) Y _i =M _i -N _i ; and

(8) 68.5°≤θ _t ≤82.5°.

On the other hand, when the any position G _i on the imaging surface 414 of the imaging element 41 moves toward the axial direction of the first coordinate axis (X axis), that is, when the any position G _i is closer to the plane surface The larger the X _i of the light source 42 is, the larger the separation distance _Mi between the position _Gi and the geometric cylinder 431 of the polarization separation element 43 along the normal line of the imaging plane 414 .

Wherein, when the display device 4 of the present invention complies with the above relationship, the illumination light beam L1 provided by the planar surface light source 42 can be uniformly irradiated on the imaging surface 414 of the imaging element 41 , and the present invention is not suitable for the imaging surface 414 of the imaging element 41 . The illuminance uniformity is also defined. Please refer to FIG. 12 , which illustrates the position distribution of a plurality of positions P1 to P13 on the imaging surface 414 of the imaging element 41 used to calculate the illuminance uniformity and the relative positions of these positions P1 to P13 to the periphery of the imaging surface 414 respectively For example, the distance between the position P1 and the upper edge of the imaging surface 414 is 16.6% of the length of the left side of the imaging surface 414 , and the distance between the position P1 and the left side of the imaging surface 414 is the upper edge of the imaging surface 414 16.6% of the length, and the rest of the positions P2 to P13 are analogous, so they will not be repeated. In addition, the energy obtained by these positions P1 to P13 within the viewing angle of a specific pixel after the illumination beam L1 is projected thereon can be represented by E1 to E13 respectively, and the illuminance uniformity U on the imaging surface 414 of the imaging element 41 is defined as the following relation:

U=(E _min /E _max )×100%;

Wherein, E _min is the minimum value among the energies E1 ˜ E13 , and E _max is the maximum value among the energies E1 ˜ E13 .

Preferably, but not limited to this, when the half length dX of the short side 4141 of the imaging surface 414 is less than 2.75 millimeters (mm), the display device 4 also complies with one of the following relational expressions (a1) to (a6) By:

(a1) When X _i =0, 3.6≤Y _i <3.8 (refer to the tenth, eleventh, and twelfth implementations shown later);

(a2) When X _i =0, 3.8≤Y _i <4.0 (refer to the seventh, eighth, ninth, and nineteenth implementations shown later);

(a3) When X _i =0, 4.0≤Y _i <4.2 (refer to the sixth, seventeenth, eighteenth, twenty, and twenty-first implementations shown later);

(a4) When X _i =0, 4.2≤Y _i <4.4 (refer to the fifth, sixteen, twenty-third, twenty-fifth, twenty-six, and twenty-seventh implementations shown later);

(a5) When X _i =0, 4.4≤Y _i <4.6 (refer to the third, fourth, thirteen, fourteen, twenty-two, twenty-four implementations shown later); and

(a6) When X _i =0, 4.6≤Y _i <4.8 (refer to the first, second, and fifteenth implementations shown later); and when the half length dX of the short side 4141 of the imaging surface 414 is greater than 2.75 When the millimeter (mm) is less than or equal to 3.5 millimeters (mm), the display device 4 also conforms to one of the following relational expressions (b1) to (b8):

(b1) When X _i =0, 4.2≤Y _i <4.4 (refer to the thirty-eighth embodiment shown later);

(b2) When X _i =0, 4.4≤Y _i <4.6 (refer to the thirty-seventh, thirty-ninth, forty, forty-one, fifty-three, fifty-fourth implementations shown later) ;

(b3) When X _i =0, 4.6≤Y _i <4.8 (refer to the thirty-fourth, thirty-sixth, and fifty-second embodiments shown later);

(b4) When X _i =0, 4.8≤Y _i <5.0 (refer to the thirty-first, thirty-third, thirty-five, forty-nine, fifty-one, sixty, sixty-one shown later , sixty-two, sixty-three implementation forms);

(b5) When X _i =0, 5.0≤Y _i <5.2 (refer to the forty-eighth, fifty, fifty-seven, fifty-eight, and fifty-ninth implementations shown later);

(b6) When X _i =0, 5.2≤Y _i <5.4 (refer to the thirtieth, thirty-second, forty-third, forty-fifth, forty-sixth, forty-seventh, fifty-fifth shown later 5. Fifty-six implementation modes);

(b7) When X _i =0, 5.4≤Y _i <5.6 (refer to the twenty-ninth, forty-two, and forty-fourth implementations shown later); and

(b8) When X _i =0, 5.6≦Y _i <5.8 (refer to the twenty-eighth embodiment shown later).

Please refer to Tables 1 to 63 shown below, which respectively illustrate sixty-three implementations conforming to the above-mentioned relational expressions (1) to (4) or to the above-mentioned relational expressions (5) to (8). Under the conditions of these embodiments, the illuminance uniformity U on the imaging surface 414 of the imaging element 41 can all reach more than 85%.

According to the above description, the display device of the present invention transmits the geometric cylinder of the polarized light separation element and the top cover glass of the imaging element with a specific inclination angle of the flat surface light source under a specific distance distribution. The provided illuminating beam can evenly illuminate the imaging surface of the imaging element within a specific viewing angle, and can also shorten the distance between the imaging surface of the imaging element and the polarization separation element, thereby reducing the overall thickness and volume of the display device. In addition, since the polarization separation element of the display device of the present invention does not require injection molding or grinding of precise optical elements, nor does it need to be matched with precise optical elements, it has the advantages of simple element fabrication and cost, and has practical industrial application value.

The above-mentioned embodiments are only used to illustrate the principles and effects of the present invention, and to illustrate the technical characteristics of the present invention, but are not intended to limit the protection scope of the present invention. Any changes or equivalent arrangements that can be easily accomplished by those of ordinary skill in the art without departing from the technical principles and spirit of the present invention fall within the claimed scope of the present invention. Therefore, the protection scope of the present invention should be as listed in the claims.

Claims (30)

1. A display device, characterized in that, comprising: an imaging element having an imaging surface for providing an image; a planar surface light source having a light-emitting surface for providing a plurality of illumination beams, and a normal line of the light-emitting surface and a normal line of the imaging surface are in a non-perpendicular configuration relationship; and a polarized light separation element, which is disposed between the planar surface light source and the imaging element and has a geometric cylinder, and the geometric cylinder is used for at least part of a first polarization from the planar surface light source The illumination beam is projected onto it and reflected, so that at least part of the illumination beam belonging to the first polarization goes toward the direction of the imaging element; wherein, any of the illumination beams belonging to the first polarization is projected on After reaching the imaging element and then exiting the imaging element, it is converted into an imaging beam belonging to a second polarization, and the geometric cylinder is also used for at least part of the imaging beam from the imaging element and belonging to the second polarization The light beam passes through it to make the image appear outward. 2. The display device according to claim 1, wherein when the half length of one side of the imaging surface is less than 2.75 mm, the display device complies with the following relational expression: -0.047385X _i ² +0.771625X _i +3.4≤Y _i ; Y _i ≤-0.047385X _i ² +0.771625X _i +5; Y _i =M _i -N _i ; and 69°≤θ _t≤78 °; Wherein, X _i is a position defined on the imaging plane according to a coordinate axis, and the coordinate axis is parallel to the side of the imaging plane and perpendicular to the normal of the imaging plane, and _Mi is the The position on the imaging surface extends up to the geometric cylinder along the normal line of the imaging surface, and _Ni is the position on the imaging surface that extends up to the geometric cylinder along the normal line of the imaging surface. A separation distance of an upper surface of the imaging element, θ _t is an included angle between the normal line of the imaging surface and the normal line of the light-emitting surface. 3. The display device of claim 2, wherein the display device further complies with one of the following relational expressions (a1) to (a6): (a1) When X _i =0, 3.6≤Y _i <3.8; (a2) When X _i =0, 3.8≤Y _i <4.0; (a3) When X _i =0, 4.0≤Y _i <4.2; (a4) When X _i =0, 4.2≤Y _i <4.4; (a5) when X _i =0, 4.4≤Y _i <4.6; and (a6) When X _i =0, 4.6≤Y _i <4.8. 4. The display device according to claim 1, wherein when the half length of one side of the imaging surface is greater than 2.75 mm and less than 3.5 mm, the display device complies with the following relational formula: -0.043299X _i ² +0.745345X _i +4≤Y _i ; Y _i ≤-0.043299X _i ² +0.745345X _i +6; Y _i =M _i -N _i ; and 68.5°≤θ _t ≤82.5°; Wherein, X _i is a position defined on the imaging plane according to a coordinate axis, and the coordinate axis is parallel to the side of the imaging plane and perpendicular to the normal of the imaging plane, and _Mi is the The position on the imaging surface extends up to the geometric cylinder along the normal line of the imaging surface, and _Ni is the position on the imaging surface that extends up to the geometric cylinder along the normal line of the imaging surface. A separation distance of an upper surface of the imaging element, θ _t is an included angle between the normal line of the imaging surface and the normal line of the light-emitting surface. 5. The display device of claim 4, wherein the display device further complies with one of the following relational expressions (b1) to (b8): (b1) When X _i =0, 4.2≤Y _i <4.4; (b2) When X _i =0, 4.4≤Y _i <4.6; (b3) When X _i =0, 4.6≤Y _i <4.8; (b4) When X _i =0, 4.8≤Y _i <5.0; (b5) When X _i =0, 5.0≤Y _i <5.2; (b6) When X _i =0, 5.2≤Y _i <5.4; (b7) when X _i =0, 5.4≤Y _i <5.6; and (b8) When X _i =0, 5.6≤Y _i <5.8. 6. The display device of claim 2 or 4, wherein the imaging element comprises a cover glass, an intermediate layer and a circuit board, and the intermediate layer is located between the cover glass and the circuit board ; wherein, the imaging surface is located in the intermediate layer, and the upper surface of the imaging element is the upper surface of the upper cover glass. 7 . The display device of claim 1 , wherein the imaging surface has a position defined according to a coordinate axis, and the coordinate axis is parallel to one side of the imaging surface and perpendicular to the imaging surface. 8 . The normal line of the imaging surface; wherein, the position on the imaging surface extends upward along the normal line of the imaging surface to the geometric cylinder with an interval distance that should be the further the position on the imaging surface is toward the coordinate axis The larger the axis moves. 8 . The display device of claim 2 , wherein the imaging surface is rectangular, and the side of the imaging surface is a short side of the imaging surface. 9 . 9 . The display device of claim 1 , wherein the flat surface light source comprises a substrate, a plurality of light emitting diodes and a diffuser, and the plurality of light emitting diodes are disposed on the substrate and provide a plurality of light emitting diodes. 10 . light beams, and the plurality of light beams form a light source after passing through the diffusing sheet. 10 . The display device of claim 1 , wherein the planar surface light source comprises a light chamber, at least one light-emitting diode and a diffuser, and the at least one light-emitting diode and the diffuser are respectively 10 . are located at both ends of the light chamber; wherein, the at least one light emitting diode is used to provide a plurality of light beams, and the plurality of light beams travel in the light chamber and are projected and diffusely reflected to the diffuser, and formed after passing through the diffuser A light source. 11. The display device of claim 1, wherein the planar surface light source comprises at least one light emitting diode and a light guide plate, and the at least one light emitting diode is used for providing a plurality of light beams, and the guide The light plate is used for projecting the plurality of light beams therein to guide the travel of the light beams, so that the plurality of light beams form a light source after passing through the light guide plate. 12. The display device as claimed in claim 9, 10 or 11, wherein the flat surface light source further comprises a polarizing plate for the plurality of light beams to pass through and output the first polarized light to the outside of the complex illumination beams. 13. The display device of claim 1, wherein the imaging element is a single crystal silicon reflective liquid crystal element. 14 . The display device of claim 1 , wherein the polarized light separation element is a reflective polarizer or a reflective polarized light enhancement film. 15 . 15. The display device of claim 1, wherein the polarization separation element is in the shape of a thin film. 16. A display device, comprising: an imaging element having an imaging surface for providing an image; a planar surface light source for providing a plurality of illumination beams; and A polarized light separation element, disposed between the planar surface light source and the imaging element, for at least part of the illumination beam from the planar surface light source and belonging to a first polarization to be projected onto it and reflected , make at least part of the illumination beam belonging to the first polarization to travel in the direction of the imaging element, and also allow at least part of the imaging beam from the imaging element and belonging to a second polarization to pass through it to make the image outward present; The imaging surface has a position defined according to a coordinate axis, and the coordinate axis is parallel to one side of the imaging surface and perpendicular to a normal of the imaging surface, and the imaging surface is A separation distance from the position extending upward to the polarization separation element along the normal line of the imaging plane should be larger as the position on the imaging plane moves toward an axial direction of the coordinate axis. 17 . The display device of claim 16 , wherein the planar surface light source has a light-emitting surface, and a normal line of the light-emitting surface and the normal line of the imaging surface are in a non-perpendicular configuration relationship. 18 . . 18. The display device of claim 17, wherein when the half length of the side of the imaging surface is less than 2.75 mm, the display device complies with the following relationship: -0.047385X _i ² +0.771625X _i +3.4≤Y _i ; Y _i ≤-0.047385X _i ² +0.771625X _i +5; Y _i =M _i -N _i ; and 69°≤θ _t≤78 °; Wherein, X _i is the position defined on the imaging plane according to the coordinate axis, and M _i is the position on the imaging plane extending upward along the normal line of the imaging plane to the interval of the polarization separation element distance, _Ni is the distance from the position on the imaging surface extending upward along the normal line of the imaging surface to an upper surface of the imaging element, θ _t is the normal line of the imaging surface and the light-emitting surface an angle between the normals of . 19. The display device of claim 18, wherein the display device further complies with one of the following relational expressions (a1) to (a6): (a1) When X _i =0, 3.6≤Y _i <3.8; (a2) When X _i =0, 3.8≤Y _i <4.0; (a3) When X _i =0, 4.0≤Y _i <4.2; (a4) When X _i =0, 4.2≤Y _i <4.4; (a5) when X _i =0, 4.4≤Y _i <4.6; and (a6) When X _i =0, 4.6≤Y _i <4.8. 20. The display device according to claim 17, wherein when the half length of the side of the imaging surface is greater than 2.75 mm and less than 3.5 mm, the display device complies with the following relation: -0.043299X _i ² +0.745345X _i +4≤Y _i ; Y _i ≤-0.043299X _i ² +0.745345X _i +6; Y _i =M _i -N _i ; and 68.5°≤θ _t ≤82.5°; Wherein, X _i is the position defined on the imaging plane according to the coordinate axis, and M _i is the position on the imaging plane extending upward along the normal line of the imaging plane to the interval of the polarization separation element distance, _Ni is the distance from the position on the imaging surface extending upward along the normal line of the imaging surface to an upper surface of the imaging element, θ _t is the normal line of the imaging surface and the light-emitting surface an angle between the normals of . 21. The display device of claim 20, wherein the display device further complies with one of the following relational expressions (b1) to (b8): (b1) When X _i =0, 4.2≤Y _i <4.4; (b2) When X _i =0, 4.4≤Y _i <4.6; (b3) When X _i =0, 4.6≤Y _i <4.8; (b4) When X _i =0, 4.8≤Y _i <5.0; (b5) When X _i =0, 5.0≤Y _i <5.2; (b6) When X _i =0, 5.2≤Y _i <5.4; (b7) when X _i =0, 5.4≤Y _i <5.6; and (b8) When X _i =0, 5.6≤Y _i <5.8. 22. The display device of claim 18 or 20, wherein the imaging element comprises a cover glass, an intermediate layer and a circuit board, and the intermediate layer is located between the cover glass and the circuit board ; wherein, the imaging surface is located in the intermediate layer, and the upper surface of the imaging element is the upper surface of the upper cover glass. 23. The display device of claim 16, wherein the planar surface light source comprises a substrate, a plurality of light emitting diodes and a diffuser, and the plurality of light emitting diodes are disposed on the substrate and provide a plurality of light emitting diodes. light beams, and the plurality of light beams form a light source after passing through the diffusing sheet. 24. The display device of claim 16, wherein the flat surface light source comprises a light chamber, at least one light emitting diode and a diffuser, and the at least one light emitting diode and the diffuser are respectively are located at both ends of the light chamber; wherein, the at least one light emitting diode is used to provide a plurality of light beams, and the plurality of light beams travel in the light chamber and are projected and diffusely reflected to the diffuser, and formed after passing through the diffuser A light source. 25. The display device of claim 16, wherein the planar surface light source comprises at least one light emitting diode and a light guide plate, and the at least one light emitting diode is used for providing a plurality of light beams, and the plurality of light beams are The light beam forms a light source after passing through the light guide plate. 26. The display device as claimed in claim 23, 24 or 25, wherein the flat surface light source further comprises a polarizer for allowing the plurality of light beams to pass through and output the first polarization of the complex illumination beams. 27. The display device of claim 16, wherein the imaging surface is rectangular, and the side of the imaging surface is a short side of the imaging surface. 28. The display device of claim 16, wherein the imaging element is a single crystal silicon reflective liquid crystal element. 29. The display device of claim 16, wherein the polarization separation element is a reflective polarizer or a reflective polarized light enhancement film. 30. The display device of claim 16, wherein the polarization separation element is in the shape of a thin film.

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