CN108803053B - 3D light field display system - Google Patents

Abstract

The embodiment of the invention provides a three-dimensional light field display system, which comprises a backlight source, a liquid crystal panel, a cylindrical lens grating, a holographic functional screen and a slit grating, wherein the liquid crystal panel is arranged on the backlight source; the backlight source is used for projecting light to the liquid crystal panel; the liquid crystal panel, the cylindrical lens grating, the holographic functional screen and the slit grating are sequentially arranged along the propagation direction of light; the liquid crystal panel is used for modulating light projected by the backlight source; the cylindrical lenticulation is used for providing a single parallax optical field with a three-dimensional effect based on the modulated light; the holographic function screen is used for diffusing the light field provided by the cylindrical lens grating, so that an observer can see the light field provided by the cylindrical lens grating from different angles; the slit grating is used for providing a full parallax light field with a stereoscopic effect based on the diverged light field. According to the embodiment of the invention, the cylindrical lens grating is arranged to provide a single parallax light field with a three-dimensional effect, the holographic functional screen divergent square and the slit grating is arranged to provide a full parallax light field with a three-dimensional effect, and the three cooperate with each other to realize full parallax viewing.

Description

3D light field display system

technical field

Embodiments of the present invention relate to the field of optics, and more particularly, to a three-dimensional light field display system.

Background technique

Electronic sand table display technology is currently playing an important role in military command, urban planning, emergency response and real estate development. However, most of the existing electronic sand table display technologies are still limited to two-dimensional flat display, which cannot meet the needs for perception of depth data and spatial information. The ability to achieve high-definition, large viewing angle, and true reproduction of three-dimensional scenes has become the biggest demand for electronic sand table technology. The existing three-dimensional electronic sand table mainly includes mirror-assisted display and holographic display. Mirror-assisted display technology increases viewer discomfort due to the need to wear special equipment. Although the holographic display technology can restore the three-dimensional scene realistically, it still has shortcomings such as small angle, single color, and excessive data volume.

Autostereoscopic display technology is a relatively mature display method that directly provides three-dimensional information to the human eye without wearing auxiliary equipment. The current mainstream technology is the solution of cylindrical lens grating and slit grating.

The cylindrical lens grating stereo display is composed of a cylindrical lens grating and a liquid crystal display panel. The cylindrical lens grating is the core part of the technology. It has the ability of spatial light splitting, and controls the light from different parallax images on the liquid crystal to form a spatial viewpoint, which enters the left and right eyes respectively to form a three-dimensional sense. FIG. 1 is a display principle diagram of a lenticular grating stereoscopic display in the prior art, and the display principle is shown in FIG. 1 .

Figure 2 is a schematic diagram of the display principle of a slit grating stereo display in the prior art. The structure of a naked-eye 3D display device based on a slit grating is shown in Figure 2. The slit grating can be regarded as a periodic light-transmitting strip and a light-shielding strip alternating Composed of the arrangement, the shading strip can guarantee complete blocking of the light. By loading the image coding information of multiple viewpoints on the 2D display, different parallax images can be imaged at different positions in space, thereby realizing the naked-eye 3D display effect. The lenticular grating and the slit grating need to be inclined at a certain angle to eliminate the moire fringes formed by the LCD pixel space period and the grating space period. It should be noted that the moire fringes refer to the periodic structure of the grating and the periodic structure of the black matrix on the LCD display. fringes produced by the interference effect.

Current autostereoscopic display backlights emit light in all directions, and the cylindrical lens array will produce aberrations when modulating the light. In the current display, it is basically a single parallax display.

SUMMARY OF THE INVENTION

In view of the problems existing in the prior art, embodiments of the present invention provide a three-dimensional light field display system.

An embodiment of the present invention provides a three-dimensional light field display system, including a backlight source, a liquid crystal panel, a cylindrical lens grating, a holographic function screen and a slit grating; the backlight source is used to project light to the liquid crystal panel; The liquid crystal panel, the cylindrical lens grating, the holographic function screen and the slit grating are arranged in sequence in the propagation direction; the liquid crystal panel is used to modulate the light projected by the backlight source; the cylindrical lens grating, It is used to provide a single parallax light field with a stereoscopic effect based on the modulated light; the holographic function screen is used to diffuse the light field provided by the cylindrical lens grating, so that the observer can see the column from different angles The light field provided by the lens grating; the slit grating is used to provide a full parallax light field with a stereoscopic effect based on the diverged light field.

An embodiment of the present invention provides a three-dimensional light field display system, including a directional backlight source, a liquid crystal panel, a cylindrical lens grating, a holographic function screen and a slit grating; the backlight source is used to project light to the liquid crystal panel; The cylindrical lens grating, the liquid crystal panel, the holographic function screen, and the slit grating are arranged in sequence in the propagation direction; the cylindrical lens grating is used to provide a stereoscopic effect based on the light projected by the backlight source. A single parallax light field; the liquid crystal panel is used to modulate the single parallax light field; the holographic function screen is used to diverge the modulated single parallax light field, so that the observer can see the single parallax light field from different angles The light field provided by the cylindrical lens grating; the slit grating is used to provide a full parallax light field with a stereoscopic effect based on the diverged light field.

The three-dimensional light field display system provided by the embodiment of the present invention provides a single parallax light field with a stereoscopic effect by setting a cylindrical lens grating, a holographic function screen divergent square, and a slit grating provides a full parallax light field with a stereoscopic effect. Working together, full parallax viewing can be achieved.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative efforts.

Fig. 1 is the display principle diagram of the lenticular grating stereoscopic display in the prior art;

Fig. 2 is the display principle diagram of the slit grating stereoscopic display in the prior art;

3 is a schematic structural diagram of an embodiment of a three-dimensional light field display system according to the present invention;

Fig. 4 is the principle diagram that the X-axis of the three-dimensional space Cartesian coordinate system established in the embodiment of the present invention orients the light upward to form the viewpoint;

5 is a schematic structural diagram of a three-dimensional light field display system marked with a gap in an embodiment of the present invention;

FIG. 6 is a flow chart of the principle of displaying images in a three-dimensional display system according to an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of another embodiment of a three-dimensional light field display system according to the present invention;

FIG. 8 is a schematic diagram of an established three-dimensional space Cartesian coordinate system X-axis oriented upward to form a viewpoint in an embodiment of the present invention;

FIG. 9 is a flow chart of the principle of displaying images in another three-dimensional display system according to an embodiment of the present invention;

in,

101—2D display; 102—cylindrical lens grating; 202—slit grating;

303—holographic function screen; 304—liquid crystal panel; 305—backlight source.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments These are some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

FIG. 3 is a schematic structural diagram of an embodiment of a three-dimensional light field display system according to the present invention. As shown in FIG. 3 , the three-dimensional light field display system includes a backlight source 305 , a liquid crystal panel 304 , a cylindrical lens grating 102 , a holographic function screen 303 and a slit grating 202; the backlight 305 is used to project light to the liquid crystal panel 304; the liquid crystal panel 304, the cylindrical lens grating 102, the holographic function screen 303 and the The slit grating 202; the liquid crystal panel 304 is used to modulate the light projected by the backlight source 305; the cylindrical lens grating 102 is used to provide a single parallax light field with a stereoscopic effect based on the modulated light; the hologram The functional screen 303 is used for diffusing the light field provided by the cylindrical lens grating 102, so that the observer can see the light field provided by the cylindrical lens grating 102 from different angles; the slit grating 202 is used for The divergent light field provides a full parallax light field with a stereoscopic effect. Directional backlight source, liquid crystal panel, cylindrical lens grating, holographic function screen and slit grating; the directional backlight source is used for emitting light; the liquid crystal panel, the cylindrical lens grating, the Holographic function screen and the slit grating.

Specifically, the three-dimensional light field display system provided by the embodiment of the present invention is a three-dimensional light field display system suitable for desktop electronic sand table display.

Further, the cylindrical lens grating 102 in the embodiment of the present invention is a cylindrical lens array arranged in a precise period, which is usually used to realize the naked-eye 3D function. The slit grating 202 in the embodiment of the present invention is a light-shielding and light-transmitting structure arranged in a precise period, and is used for realizing the naked-eye 3D function. The function of the backlight source 305 in the embodiment of the present invention is to light up the display content loaded by the display device. The holographic function screen 303 in the embodiment of the present invention is an optical film produced by speckle holography and has a specific angle expansion effect on incident light.

It should be noted that the holographic function screen 303 has the function of diffusing light, that is, the light will be scattered softly and uniformly on its surface, and the divergence angle is controllable.

It should be noted that, when the three-dimensional light field display system provided by the embodiment of the present invention is applied, the viewer watches the image in the three-dimensional light field display system, and the desktop of the three-dimensional light field display system displayed on the desktop electronic sand table is the above-mentioned three-dimensional light field display system. The plane where the slit grating 202 is located.

The three-dimensional light field display system provided by the embodiment of the present invention provides a single parallax light field with a stereoscopic effect by setting a cylindrical lens grating, a holographic function screen divergent square, and a slit grating provides a full parallax light field with a stereoscopic effect. Working together, full parallax viewing can be achieved.

Based on the above embodiment, the backlight source 305 is a directional backlight source, and the directional backlight source is used to project directional light to the liquid crystal panel.

It should be noted that the current autostereoscopic display backlight emits light in all directions, and the cylindrical lens array will produce aberration when modulating the light, which will introduce crosstalk between viewpoints, that is, it should enter a certain one. Light from one eye enters the other eye, causing ghosting and blurring of images, which in turn reduces the quality of 3D stereoscopic display. In a traditional autostereoscopic display system, the diffused light emitted by a pixel passes through its corresponding lens or slit to form a correct viewing area. Since the backlight emits light in all directions, a considerable part of the light will overflow into the adjacent lens to construct the viewpoint in the next display cycle, which will lead to the final display effect. When moving, you will feel the obvious content cycle jump, affecting the viewing quality.

The light source for emitting light used in the embodiment of the present invention is a directional backlight source instead of a traditional scattered backlight source, because the directional light is modulated by the liquid crystal panel 304 to obtain color information and then exits (the liquid crystal panel 304 does not change the direction of the light), and the light When passing through the cylindrical lens grating 102, directional deflection will occur to ensure that the light will fall on the designated viewpoint. Moreover, since the light emitted by the directional backlight is directional, it means that the light emitted by the directional backlight will only pass through its corresponding lens and form a correct viewing area, so that it will not pass through other adjacent lenses to form a jump viewing area. This will not affect the viewing results.

In the three-dimensional light field display system provided by the embodiment of the present invention, by setting the directional backlight source, the emitted light will only pass through the corresponding lens to form a correct viewing area, so that it will not pass through other adjacent lenses to form jump vision. zone, and thus will not affect the viewing result, solving the problems of ghosting and blurring in the prior art.

Based on the above embodiments, the directional backlight source is any one of a parallel light source, a converging light source, and a diverging light source.

Specifically, when the directional backlight is a parallel light source, the directional backlight emits directional parallel light. When the directional backlight is a condensing light source, the directional backlight emits directional condensing light. When the directional backlight is a diverging light source, the directional backlight emits directional diverging light.

Based on the above embodiment, the periodic structure of the cylindrical lens grating 102 is perpendicular to the periodic structure of the slit grating 202 .

Specifically, the plane formed by the periodic structure of the cylindrical lens grating 102 and the periodic structure of the slit grating 202 perpendicular to it is preferably perpendicular to the horizontal plane.

As a preferred embodiment, a three-dimensional space Cartesian coordinate system is established with the periodic structure direction of the cylindrical lens grating 102 as the X axis, the periodic structure direction of the slit grating 202 as the Y axis, and the vertical direction as the Z axis. Based on the three-dimensional space rectangular coordinate system, FIG. 4 is a schematic diagram of the established three-dimensional space rectangular coordinate system X-axis to form a viewpoint by orienting the light upward in the embodiment of the present invention. Please refer to FIG. 4 , after the light passes through the cylindrical lens grating 102, At this time, the light will form a viewpoint in the X-axis direction, that is, unidirectional parallax, and the X-axis viewing angle is determined by the refractive power of the lens.

The light passing through the cylindrical lens grating 102 passes through the holographic function screen 303 and the slit grating 202 to form a field of view on the Y-axis, thereby realizing a full parallax effect.

It should be noted that, the viewpoint in the embodiment of the present invention refers to a position in space formed by a parallax image that can be viewed correctly. The holographic function screen 303 does not spread in the X-axis direction, but spreads in the Y-axis direction.

In the three-dimensional light field display system provided by the embodiment of the present invention, by setting the periodic structure of the cylindrical lens grating to be perpendicular to the periodic structure of the slit grating, full parallax viewing can be realized, that is, the observer can watch from the upper side of the three-dimensional light field display system. When it is on the desktop, the three-dimensional effect can be observed.

Based on the above embodiment, the directional backlight source 305 and the liquid crystal panel 304 are in close contact or there is a gap between the directional backlight source 305 and the liquid crystal panel 304, and the backlight source 305 and the liquid crystal panel 304 are parallel; The liquid crystal panel 304 and the cylindrical lens grating 102 are in close contact or there is a gap between the liquid crystal panel 304 and the cylindrical lens grating 102, and the liquid crystal panel 304 and the cylindrical lens grating 102 are parallel; the cylindrical lens The grating 102 and the holographic function screen 303 are in close contact or there is a gap between the cylindrical lens grating 102 and the holographic function screen 303, and the cylindrical lens grating 102 and the holographic function screen 303 are parallel; the holographic function screen There is a gap between 303 and the slit grating 202 , and the holographic function screen 303 is parallel to the slit grating 202 .

Specifically, FIG. ₅ is a schematic structural diagram of a three-dimensional light field display system marked with a gap according to an embodiment of the present invention. Please refer to FIG. A distance, the first distance is greater than or equal to 0. D ₂ is the second distance between the liquid crystal panel 304 and the lenticular lens grating 102 , and the second distance is greater than or equal to 0. D ₃ is the third distance between the cylindrical lens grating 102 and the holographic function screen 303 , and the third distance is greater than or equal to 0. D ₄ is the fourth distance between the holographic function screen 303 and the slit grating 202 , and the fourth distance is greater than 0.

In this embodiment, a fourth distance must be left between the holographic function screen 303 and the slit grating 202, and the fourth distance must be greater than zero. By setting the size of the fourth distance and the size of the diffusion angle of the holographic function screen 303, the size of the final viewing angle of the Y-axis in the three-dimensional space rectangular coordinate system can be determined.

It should be noted that the diffusion angle in the embodiment of the present invention refers to the divergence angle of the light in the horizontal or vertical direction after passing through the holographic function screen 303 .

In the three-dimensional light field display system provided by the embodiment of the present invention, by setting the fourth distance to be greater than zero, the size of the viewing angle of the Y-axis can be set as required, so that the three-dimensional light field display system provided by the embodiment of the present invention can be based on the viewer. The height is adjusted adaptively to the final imaging height.

Based on the above embodiments, the directional backlight source is any one of a parallel light source, a converging light source, and a diverging light source.

Specifically, when the directional backlight is a parallel light source, the directional backlight emits directional parallel light. When the directional backlight is a condensing light source, the directional backlight emits directional condensing light. When the directional backlight is a diverging light source, the directional backlight emits directional diverging light. FIG. 6 is a flow chart of the principle of displaying an image in a three-dimensional display system according to an embodiment of the present invention. As shown in FIG. 6 , it includes: a directional backlight source emits light; the light passes through the liquid crystal panel 304 to load color information to become a Light with color information; the light with color information passes through the cylindrical lens grating 102 to become light with viewpoints in the direction of the periodic structure of the cylindrical lens grating 102 ; the light with viewpoints in the direction of the periodic structure of the cylindrical lens grating 102 The light passing through the holographic function screen 303 is diffused in the direction perpendicular to the periodic structure direction of the cylindrical lens grating 102 to become diffused light; The viewpoint is formed, and the display of the image is completed.

It should be noted that the slit grating 202 has periodic shielding properties and light transmission properties.

Based on the above-mentioned embodiment, FIG. 7 is a schematic structural diagram of another embodiment of a three-dimensional light field display system according to the present invention. As shown in FIG. 7 , the three-dimensional light field display system includes a backlight source 305 , a liquid crystal panel 304 , a cylindrical lens grating 102 , a hologram The function screen 303 and the slit grating 202; the backlight source 305 is used to project light to the liquid crystal panel 304; the cylindrical lens grating 102, the liquid crystal panel 304, the hologram are sequentially arranged along the propagation direction of the light The function screen 303 and the slit grating 202; the cylindrical lens grating 102 is used to provide a single parallax light field with a stereoscopic effect based on the light projected by the backlight 305; the liquid crystal panel 304 is used to modulate the Single parallax light field; the holographic function screen 303 is used for the single parallax light field after divergence modulation, so that the observer can see the light field provided by the cylindrical lens grating 102 from different angles; the slit grating 202, for providing a full parallax light field with a stereoscopic effect based on the diverged light field.

Specifically, the three-dimensional light field display system provided by the embodiment of the present invention is a three-dimensional light field display system suitable for desktop electronic sand table display.

Further, the cylindrical lens grating 102 in the embodiment of the present invention is a cylindrical lens array arranged in a precise period, which is usually used to realize the naked-eye 3D function. The slit grating 202 in the embodiment of the present invention is a light-shielding and light-transmitting structure arranged in a precise period, and is used for realizing the naked-eye 3D function. The function of the backlight source 305 in the embodiment of the present invention is to light up the display content loaded by the display device. The holographic function screen 303 in the embodiment of the present invention is an optical film produced by speckle holography and has a specific angle expansion effect on incident light.

It should be noted that the holographic function screen has the function of diffusing light, that is, the light will be scattered softly and uniformly on its surface, and the divergence angle is controllable.

It should be noted that, when the three-dimensional light field display system provided by the embodiment of the present invention is applied, the viewer watches the image in the three-dimensional light field display system, and the desktop of the three-dimensional light field display system displayed on the desktop electronic sand table is the above-mentioned three-dimensional light field display system. The plane where the slit grating 202 is located.

The three-dimensional light field display system provided by the embodiment of the present invention provides a single parallax light field with a stereoscopic effect by setting a cylindrical lens grating, a holographic function screen divergent square, and a slit grating provides a full parallax light field with a stereoscopic effect. Working together, full parallax viewing can be achieved.

Based on the above embodiment, the backlight source 305 is a directional backlight source, and the directional backlight source is used to project directional light to the liquid crystal panel.

It should be noted that the current autostereoscopic display backlight emits light in all directions, and the cylindrical lens array will produce aberration when modulating the light, which will introduce crosstalk between viewpoints, that is, it should enter a certain one. Light from one eye enters the other eye, causing ghosting and blurring of images, which in turn reduces the quality of 3D stereoscopic display. In a traditional autostereoscopic display system, the diffused light emitted by a pixel passes through its corresponding lens or slit to form a correct viewing area. Since the backlight emits light in all directions, a considerable part of the light will overflow into the adjacent lens to construct the viewpoint in the next display cycle, which will lead to the final display effect. When moving, you will feel the obvious content cycle jump, affecting the viewing quality.

The light source used in the embodiment of the present invention is a directional backlight source instead of a traditional diffused backlight source, because when the directional light passes through the cylindrical lens grating 102, directional deflection will occur to ensure that the light will fall on a designated viewpoint. Moreover, since the light emitted by the directional backlight is directional, it means that the light emitted by the directional backlight will only pass through its corresponding lens and form a correct viewing area, so that it will not pass through other adjacent lenses to form a jump viewing area. This will not affect the viewing results.

In the three-dimensional light field display system provided by the embodiment of the present invention, by setting the directional backlight source, the emitted light will only pass through the corresponding lens to form a correct viewing area, so that it will not pass through other adjacent lenses to form jump vision. zone, and thus will not affect the viewing result, solving the problems of ghosting and blurring in the prior art.

Based on the above embodiment, the periodic structure of the cylindrical lens grating 102 is perpendicular to the periodic structure of the slit grating 202 .

Specifically, the plane formed by the periodic structure of the cylindrical lens grating 102 and the periodic structure of the slit grating 202 perpendicular to it is preferably perpendicular to the horizontal plane.

As a preferred embodiment, a three-dimensional space Cartesian coordinate system is established with the periodic structure direction of the cylindrical lens grating 102 as the X axis, the periodic structure direction of the slit grating 202 as the Y axis, and the vertical direction as the Z axis. Based on the three-dimensional space Cartesian coordinate system, FIG. 8 is a schematic diagram of the established three-dimensional space Cartesian coordinate system X-axis to form a viewpoint in an upward direction. Please refer to FIG. 8 , after the light passes through the cylindrical lens grating 102, At this time, the light will form a viewpoint in the X-axis direction, that is, unidirectional parallax, and the X-axis viewing angle is determined by the refractive power of the lens.

The light passing through the cylindrical lens grating passes through the liquid crystal panel, and then passes through the holographic function screen 303 and the slit grating 202, so as to form a field of view on the Y axis, thereby realizing a full parallax effect.

It should be noted that, the viewpoint in the embodiment of the present invention refers to a position in space formed by a parallax image that can be viewed correctly. The holographic function screen does not spread in the X-axis direction, but spreads in the Y-axis direction.

In the three-dimensional light field display system provided by the embodiment of the present invention, by setting the periodic structure of the cylindrical lens grating to be perpendicular to the periodic structure of the slit grating, full parallax viewing can be realized, that is, the observer can watch from the upper side of the three-dimensional light field display system. When it is on the desktop, the three-dimensional effect can be observed.

Based on the above embodiments, the directional backlight source is any one of a parallel light source, a converging light source, and a diverging light source.

Specifically, when the directional backlight is a parallel light source, the directional backlight emits directional parallel light. When the directional backlight is a condensing light source, the directional backlight emits directional condensing light. When the directional backlight is a diverging light source, the directional backlight emits directional diverging light.

Based on the above embodiment, the backlight source 305 and the cylindrical lens grating 102 are in close contact with each other or there is a gap between the backlight source 305 and the cylindrical lens grating 102 , and the backlight source 305 and the cylindrical lens grating 102 are parallel ; The cylindrical lens grating 102 and the liquid crystal panel 304 are in close contact or there is a gap between the cylindrical lens grating 102 and the liquid crystal panel 304, and the cylindrical lens grating 102 and the liquid crystal panel 304 are parallel; the liquid crystal The panel 304 is in close contact with the holographic function screen 303 or there is a gap between the liquid crystal panel 304 and the holographic function screen 303, and the liquid crystal panel 304 and the holographic function screen 303 are parallel; the holographic function screen 303 and There is a gap between the slit gratings 202 , and the holographic function screen 303 is parallel to the slit grating 202 .

Specifically, D ₅ is the fifth distance between the backlight source 305 and the cylindrical lens grating 102 , and the fifth distance is greater than or equal to 0. D ₆ is the sixth distance between the cylindrical lens grating 102 and the liquid crystal panel 304 , and the sixth distance is greater than or equal to 0. D ₇ is the seventh distance between the liquid crystal panel 304 and the holographic function screen 303 , and the seventh distance is greater than or equal to 0. D ₈ is the eighth distance between the holographic function screen 303 and the slit grating 202 , and the eighth distance is greater than 0.

In this embodiment, an eighth distance must be left between the holographic function screen 303 and the slit grating 202, and the eighth distance must be greater than zero. By setting the size of the eighth distance and the size of the diffusion angle of the holographic function screen 303 , the size of the final viewing angle of the Y-axis in the three-dimensional space rectangular coordinate system can be determined.

It should be noted that the diffusion angle in the embodiment of the present invention refers to the divergence angle of the light in the horizontal or vertical direction after passing through the holographic function screen 303 .

In the three-dimensional light field display system provided by the embodiment of the present invention, by setting the eighth distance to be greater than zero, the size of the viewing angle of the Y-axis can be set as required, thereby enabling the three-dimensional light field display system provided by the embodiment of the present invention to be based on the viewer. The height is adjusted adaptively to the final imaging height.

FIG. 9 is a flow chart of the principle of displaying images in another three-dimensional display system according to an embodiment of the present invention. As shown in FIG. 9 , it includes: a directional backlight source emits light; the light passes through the cylindrical lens grating 102 to become a cylindrical lens The light with the viewpoint in the periodic structure direction of the grating 102; the light with the viewpoint in the periodic structure direction of the cylindrical lens grating 102 passes through the liquid crystal panel 304 and loads color information to become light with color information; the light with color information The light of the information passes through the holographic function screen 303 and diffuses in a direction perpendicular to the periodic structure direction of the cylindrical lens grating 102 to become diffused light; The direction forms the viewpoint and completes the display of the image.

It should be noted that the slit grating 202 has periodic shielding properties and light transmission properties.

In the three-dimensional light field display system provided by the embodiment of the present invention, by setting the directional backlight source, the emitted light will only pass through the corresponding lens to form a correct viewing area, so that it will not pass through other adjacent lenses to form jump vision. zone, and thus will not affect the viewing result, solving the problems of ghosting and blurring in the prior art. By setting the cylindrical lens grating, the holographic function screen and the slit grating, the three work together to achieve full parallax viewing.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that it can still be The technical solutions described in the foregoing embodiments are modified, or some technical features thereof are equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (6)

1. A three-dimensional light field display system is characterized by comprising a backlight source, a liquid crystal panel, a cylindrical lens grating, a holographic functional screen and a slit grating;

the backlight source is used for projecting light rays to the liquid crystal panel;

the backlight source, the liquid crystal panel, the cylindrical lens grating, the holographic functional screen and the slit grating are sequentially arranged along the propagation direction of light;

the liquid crystal panel is used for modulating the light projected by the backlight source;

the cylindrical lenticulation is used for providing a single parallax optical field with a three-dimensional effect based on the modulated light;

the holographic function screen is used for diffusing the light field provided by the cylindrical lens grating, so that an observer can see the light field provided by the cylindrical lens grating from different angles;

the slit grating is used for providing a full parallax light field with a three-dimensional effect based on the diverged light field;

the backlight source is an oriented backlight source which is used for projecting oriented light rays to the liquid crystal panel;

the periodic structure of the cylindrical lenticular grating is perpendicular to the periodic structure of the slit grating.

2. The display system of claim 1, wherein the directional backlight is any one of a parallel light source, a converging light source, and a diverging light source.

3. The display system according to claim 1, wherein the backlight source and the liquid crystal panel are closely attached or a gap is formed between the backlight source and the liquid crystal panel, and the backlight source and the liquid crystal panel are parallel;

the liquid crystal panel is tightly attached to the cylindrical lens grating or a gap is reserved between the liquid crystal panel and the cylindrical lens grating, and the liquid crystal panel is parallel to the cylindrical lens grating;

the cylindrical lens grating is tightly attached to the holographic functional screen or a gap is reserved between the cylindrical lens grating and the holographic functional screen, and the cylindrical lens grating is parallel to the holographic functional screen;

and a gap is reserved between the holographic function screen and the slit grating, and the holographic function screen is parallel to the slit grating.

4. A three-dimensional light field display system is characterized by comprising a backlight source, a liquid crystal panel, a cylindrical lens grating, a holographic functional screen and a slit grating;

the backlight source is used for projecting light rays to the liquid crystal panel;

the backlight source, the cylindrical lens grating, the liquid crystal panel, the holographic functional screen and the slit grating are sequentially arranged along the propagation direction of light;

the cylindrical lenticulation is used for providing a single parallax light field with a stereoscopic effect based on the light projected by the backlight source;

the liquid crystal panel is used for modulating the single parallax light field;

the holographic function screen is used for diffusing the modulated single parallax light field, so that an observer can see the light field provided by the cylindrical lens grating from different angles;

the slit grating is used for providing a full parallax light field with a three-dimensional effect based on the diverged light field;

the backlight source is an oriented backlight source which is used for projecting oriented light rays to the liquid crystal panel;

the periodic structure of the cylindrical lenticular grating is perpendicular to the periodic structure of the slit grating.

5. The display system of claim 4, wherein the directional backlight is any one of a parallel light source, a converging light source, and a diverging light source.

6. The display system according to claim 4, wherein the backlight source and the lenticular lens are closely attached or a gap is formed between the backlight source and the lenticular lens, and the backlight source and the lenticular lens are parallel;

the cylindrical lens grating is tightly attached to the liquid crystal panel or a gap is reserved between the cylindrical lens grating and the liquid crystal panel, and the cylindrical lens grating is parallel to the liquid crystal panel;

the liquid crystal panel is tightly attached to the holographic function screen or a gap is reserved between the liquid crystal panel and the holographic function screen, and the liquid crystal panel is parallel to the holographic function screen;

and a gap is reserved between the holographic function screen and the slit grating, and the holographic function screen is parallel to the slit grating.

Images