CN114114679A - Depth-control directional illumination display system and method - Google Patents
Depth-control directional illumination display system and method Download PDFInfo
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Abstract
The invention discloses a depth-adjustable directional illumination display system and a method, relating to the technical field of display illumination, based on the position and the visual direction of human eyes of a user, under the guidance of a central processing unit, a directional light source is utilized to determine the direction of an illumination light beam, the subsequent illumination light beam is ensured to be transmitted to a specific direction, then a light modulation module is utilized to regulate and shape the light beam to form a long-focus line illumination light beam with adjustable depth instead of a divergent light beam of ordinary illumination, the light modulation module and the directional light source are superposed on the functional effect to form display illumination pointing to the depth, so that the light beam is suddenly stopped at a certain distance from a display module without influencing the nearby area, then image information loaded in the display module is carried, the user realizes viewing in a customized visual space visual area, and outside the customized visual area, the user cannot view the image information loaded in the display module, longitudinal depth control is realized, and interference of light display noise to non-relevant users is avoided.
Description
Technical Field
The invention relates to the technical field of display illumination, in particular to a depth-control directional illumination display system and method.
Background
Electronic displays are closely related to human life, display technologies are developed vigorously under market traction, and modern displays comprise watches, mobile phones, computer monitors, televisions and other devices. The light source alone acts as an illumination source for different types of displays, and may also be used as a pattern carrier, such as a light emitting diode (OLED) display. Illumination in the conventional sense, usually lamp illumination, LED illumination, has recently also emerged as an idea, such as laser illumination, while the illumination source now also extends from an incoherent light source to a coherent light source. In real life, display and lighting are not divisible, often requiring different illumination distributions to meet different display requirements.
At present, the display illumination technology is rapidly developed, which mainly shows performance improvement in the aspect of display characteristics, such as dynamic range, color gamut, uniformity, brightness, efficiency and the like, and in addition, in the aspect of control of illumination directions, various technologies are used for controlling the illumination directions, so that great success is achieved, for example, a splicing type directional backlight source is disclosed in the prior art, namely, a space-time multiplexing method is adopted based on the directional backlight display technology, optical devices are utilized for carrying out certain regulation and control on light propagation, a series of visual areas capable of being independently switched are formed at a viewing distance, the specific illumination characteristics of directional display illumination can enable an image to be visible only in a specified direction, meanwhile, the directional illumination technology can be combined with retina tracking to become more intelligent, illumination light can only propagate to an area around the retina of an observer, for example, in a dark environment (such as a rest cabin of a passenger plane for long-distance flight), the display screen illumination of the individual viewers may become an illumination noise for other passengers, but the application of directional illumination techniques results in little effect of the illumination on passengers in the vicinity outside the lateral viewing zone. However, in the longitudinal viewing zone, the rear passengers are disturbed because the illuminating light travels a long distance before it completely disappears, and therefore, if the depth of the illuminating light source is not controlled, it still causes optical noise and, even more, light hazard to the non-display device users.
Disclosure of Invention
In order to solve the problem that the depth of an illumination light source cannot be deeply regulated and controlled in the traditional illumination display mode, the invention provides a depth regulation and control directional illumination display system and method, which are used for realizing longitudinal depth control and avoiding interference of light display noise to non-relevant users.
In order to achieve the technical effects, the technical scheme of the invention is as follows:
a depth modulated directional illumination display system, comprising: the device comprises a central processing unit, an eye tracking module, a directional light source, a light modulation module and a display module; the human eye tracking module is used for positioning the positions of the eyes of a user positioned in the visual space visual area, transmitting the position information of the eyes of the user to the central processing unit, analyzing the space angle and the depth of the eyes of the user according to the position information of the eyes of the user to obtain the visual direction of the eyes of the user, guiding the directional light source to emit the illuminating light beams in a directional mode according to the visual direction of the eyes of the user, transmitting the illuminating light beams to the light modulation module, carrying out distribution regulation and shaping on the illuminating light beams by the light modulation module, emitting the illuminating light beams subjected to the distribution regulation and shaping, then, emitting the illuminating light beams into the display module to carry image information loaded into the display module, then, emitting the illuminating light beams into the visual space visual area, and enabling the user to watch images displayed by the display module in the visual space visual area; the longitudinal depth range of the visual space visual area is determined by the parameters of the light modulation module, and the transverse range is determined by the transverse range of the emergent light field of the illumination light beam after the light modulation module is distributed, regulated and shaped.
In the technical scheme, a visual space visual area is customized in advance according to parameters of an optical modulation module, a human eye tracking module is used for positioning the positions of two eyes of a user positioned in the visual space visual area, a directional light source is used for determining the direction of illumination under the guidance of a central processing unit, the subsequent illumination light beam is ensured to spread to a specific direction, then the light modulation module is used for regulating and shaping the light beam to form a long-focus line illumination light beam with adjustable depth instead of a divergent light beam of ordinary illumination, the functional effects of the two are superposed to form display illumination with adjustable pointing depth, so that the display illumination is suddenly stopped at a certain distance from a display module without influencing nearby areas, then image information loaded into the display module is carried, the user realizes watching in the customized visual space visual area, and outside the customized visual area, the user cannot watch the image information loaded in the display module, and does not receive the illumination beam and does not display noise.
Preferably, the directional light source is a coherent light source or an incoherent light source. The coherent light source and the incoherent light source have respective advantages and disadvantages, the coherent light source can form special interference fringes on the microscopic scale and has special attributes of no diffraction and self-healing, and the incoherent light source does not have some microscopic characteristics of the coherent light source but keeps the depth regulation and control characteristics on the macroscopic scale.
Preferably, the light modulation module is a coated conical lens. The lens with the surface-type structure can form a light field with highly concentrated energy in a customized visual space visual area as a light modulation module, and the energy of the light field is rapidly dispersed in a non-customized interval, so that the lens has no illumination interference to nearby users, and is a green and high-environment-friendly illumination mode.
Preferably, the size of the directional light source is smaller than the size of the coated conical lens.
Preferably, if the size of the directional light source is larger than that of the tectorial cone lens, an aperture stop or an equivalent element is added between the directional light source and the tectorial cone lens for restricting the size of the directional light source.
Preferably, the film-coated conical lens absorbs the incident central light beam of the illumination light beam by setting a light beam absorption radius to form a central hollow dark field, the annular illumination light beam which is not absorbed is emitted to form a concentrated illumination light beam view field of the visual space view area, the light beam absorption radius regulates and controls the position of a longitudinally formed focal line of the visual space view area, and the illumination light beam of the visual space view area is longitudinally regulated and controlled; the longitudinal depth range of the visual space visual area satisfies the expression:
wherein Z isflRepresenting the longitudinal depth range, r, on the central axis of the visual area in visual space1And r2The outer radius and the beam absorption radius r of the film-coated conical lens1＞r2，naShowing the refractive index of the coated conical lens,
the characteristic angle of the coated conical lens is expressed in radian.
The visual space visual area has the characteristic of depth visual limitation, the range of the visual space visual area is determined by parameters of the light modulation module used for initial illumination light beam distribution regulation and shaping in the early stage, customization of the visual space visual area and the profile shaping function of the light modulation module complement each other, so that a user can watch the visual space visual area in the customization mode, the user cannot watch image information loaded in the display module in an un-customization section, and the illumination light beam cannot be received.
Preferably, the display module adopts an optical film layer, images are displayed on the optical film layer in a customized mode or the images are displayed in a real-time changing mode through an LCD screen, and the images loaded into the display module do not influence the macroscopic depth characteristic of the emitted illumination light beams after the distribution regulation and shaping.
The scattering characteristic of the optical film layer is extremely small or negligible, static image information can be directly rubbed on the optical display film layer for static display, and transmission of the distributed, regulated and shaped illumination light beams in a visual space visual area is not affected.
The invention also provides a depth control directional illumination display method, which is realized based on a depth control directional illumination display system and comprises the following steps:
s1, positioning the positions of the eyes of a user in a visual space visual area by using a human eye tracking module, and transmitting the information of the positions of the eyes of the user to a central processing unit;
s2, the central processing unit analyzes the space angle and the depth of the two eyes of the user according to the position information of the two eyes to obtain the visual direction of the two eyes of the user, and directs the directional light source to emit the illumination light beams directionally according to the visual direction of the two eyes of the user;
s3, transmitting the directional illumination light beam to an optical modulation module, carrying out distribution regulation and shaping on the directional illumination light beam by the optical modulation module, emitting the distributed, regulated and shaped illumination light beam to a display module, carrying image information loaded in the display module, and then emitting the illumination light beam to a visible space visual area;
and S4, the user watches the image displayed by the display module in the visual space visual area.
Preferably, the visible space viewing zone described in step S1 is customized in advance according to parameters of the light modulation module, where the light modulation module is a coated conical lens, and the parameters include: outer radius r1Beam absorption radius r2Refractive index naAnd characteristic angle
The longitudinal depth range of the customized visual space visual area satisfies the expression:
wherein Z isflRepresenting the longitudinal depth range on the central axis of the visual area of the visual space; the transverse range of the customized visual space visual area is determined by the transverse range of the emergent light field of the illumination light beam after the light modulation module is distributed, regulated and shaped.
Preferably, when the positions of both eyes of the user are outside the monitoring range of the human eye tracking module, the depth-control directional lighting display is ended.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that:
the invention provides a depth-control directional illumination display system and a method, based on the position and the viewing direction of human eyes of a user, under the guidance of a central processing unit, a directional light source is utilized to determine the direction of an illumination light beam, the subsequent illumination light beam is ensured to spread to a specific direction, then the light beam is regulated and shaped by a light modulation module to form a divergent light beam with adjustable depth instead of ordinary illumination, the light modulation module and the directional light source are superposed on a functional effect to form display illumination with adjustable directional depth, so that the light beam is suddenly stopped at a certain distance from the display module without influencing nearby areas, then image information loaded in the display module is carried, the user can view in a customized visual space visual area, and outside the customized visual area, the user cannot view the image information loaded in the display module, longitudinal depth control is realized, and interference of light display noise to non-relevant users is avoided.
Drawings
Fig. 1 is a schematic view of an overall structure of a depth-control directional illumination display system according to embodiment 1 of the present invention;
FIG. 2 is a schematic view of a coated conical lens proposed in example 1 of the present invention;
FIG. 3 is a schematic cross-sectional view of a coated conical lens proposed in example 1 of the present invention;
FIG. 4 is a schematic diagram of a conventional LED light ray with no modulated shaping;
fig. 5 is a profile view of an illumination beam after the depth-modulated directional illumination display system according to embodiment 1 of the present invention is applied;
fig. 6 is a schematic flow chart of a depth-control directional illumination display method according to embodiment 2 of the present invention;
fig. 7 is a graph showing the normalized light energy test results in the visible space vision area and the non-visible space vision area according to embodiment 3 of the present invention;
fig. 8 is a schematic view illustrating viewing results of images of the display module according to embodiment 3 of the present invention at different depths in the longitudinal direction of the central axis of the visual area of the visual space.
Wherein, 1, a central processing unit; 2. a human eye tracking module; 3. a directional light source; 4. an optical modulation module; 5. a display module; 41. a visual space region; 51. a non-visible spatial region of view; 411. the user is the human eye.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the patent;
for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product;
it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The technical solution of the present invention is further described below with reference to the accompanying drawings and examples.
Example 1
For the time of solving the unable regulation and control of the degree of depth of illumination light source, its display device illumination under carrying can cause the problem of light noise to the non-display device user on the vertical degree of depth of emergence, as shown in fig. 1, this embodiment provides a degree of depth regulation and control directive property illumination display system, includes: the human eye tracking device comprises a central processing unit 1, a human eye tracking module 2, a directional light source 3, an optical modulation module 4 and a display module 5; wherein, the eye tracking module 2 is used for positioning the positions of the eyes of the user in the visual area of the visual space based on the principle of the space position relationship of the binocular camera, which is not repeated here, the eye tracking module 2 transmits the position information of the eyes of the user to the central processing unit 1, the central processing unit 1 analyzes the space angle and the depth of the eyes of the user according to the position information of the eyes to obtain the visual direction of the eyes of the user, the directional light source 3 is guided to emit the illuminating light beams directionally according to the directions seen by the eyes of the user, the illuminating light beams are transmitted to the light modulation module 4, the light modulation module 4 carries out distribution regulation and shaping on the illuminating light beams, the illuminating light beams after the distribution regulation and shaping are emitted and then enter the display module 5 to carry the image information loaded in the display module 5, then, the image is incident to the visible space viewing area, and the user views the image displayed by the display module 5 in the visible space viewing area.
In this embodiment, referring to fig. 1, structurally, a reference numeral of a visible space viewing area is denoted by 41, a reference numeral of a human eye of a user is denoted by 411, and a reference numeral of a non-visible space viewing area outside the visible space viewing area 41 is denoted by 51, here, a default user is located in the visible space viewing area 41 to teach the working logic of the whole depth control directional illumination display system, as shown in fig. 1, the human eye tracking module 2 is linked with the directional light source 3 and the light modulation module 4, and also serves as an internal backlight component.
Even if the default user is located in the visual space view region 41, the actual visual space view region 41 is customized in advance before the design of the depth control directional illumination display system, the customization parameters are based on the parameters of the light modulation module 4, the longitudinal depth range of the customization parameters is determined by the parameters of the light modulation module 4, and the transverse range of the customization parameters is determined by the transverse range of the emergent light field of the illumination light beam after the light modulation module 4 is distributed, controlled and shaped. Under the guidance of the central processing unit 1, the directional light source 3 is utilized to determine the illumination direction, so as to ensure that the subsequent illumination light beams are transmitted to a specific direction and can only be seen in the direction seen by a user, then, the light modulation module 4 is used for regulating and shaping the light beam to form a long-focus line illumination light beam with adjustable depth instead of a divergent light beam of ordinary illumination, the light modulation module 4 and the directional light source 3 are superposed on the functional effect to form display illumination with adjustable pointing depth, so that the light beam is suddenly stopped at a certain distance from the display module without influencing the nearby area, then carrying the image information loaded into the display module 5, the user realizes the watching in the customized visual space view area 41, while outside the customized visual zone 41, the user cannot view the image information loaded in the display module 5, and does not receive the illumination light beam, and does not display noise.
In the present embodiment, the directional light source 3 is a coherent light source or an incoherent light source. The directional light source 3 adopts a coherent light source and an incoherent light source, which have advantages and disadvantages, the coherent light source can form special interference fringes on the microscopic scale and has special properties of no diffraction and self-healing, while the incoherent light source does not have some microscopic properties of the coherent light source, but keeps the depth control property on the macroscopic scale.
In this embodiment, the light modulation module 4 is a coated conical lens, the structural schematic diagram is shown in fig. 2, the coated conical lens is a special surface-shaped lens, and the lens with the surface-shaped structure can form a light field with highly concentrated energy and rapidly dispersed energy of the non-visible space view region 51 in the customized visible space view region 41 as the light modulation module 4, so that no lighting interference is caused to nearby users, and the light modulation module is a green high-environmental-protection lighting mode. In general, the size of the directional light source 3 is smaller than that of the film coated conical lens, and if the size of the directional light source 3 is larger than that of the film coated conical lens, an aperture stop is added between the directional light source 3 and the film coated conical lens to limit the size of the illumination beam emitted by the directional light source 3.
Referring to fig. 2, the coated conical lens absorbs the incident central beam of the illumination beam by setting the beam absorption radius (inner circle black), and forms a dark field with a hollow center withoutThe absorbed annular illuminating light beam is emitted to form a concentrated illuminating light beam view field of the visible space view area 41, the light beam absorption radius regulates and controls the position of a light beam focal line formed in the longitudinal direction of the visible space view area 41, and the illuminating light beam of the visible space view area is regulated and controlled longitudinally; the main function of the light modulation module 4 is to adjust and shape the light beam distribution of the light beam emitted by the directional light source 3, and the main parameter is the bottom surface angle, i.e. the characteristic angle
And when calculating according to radian system, the characteristic radius is two different values r1And r2And general r1＞r2At 0 < r1＜r2In the special surface type interval, an absorption surface (M shown as a black local area range near the center of a circle in fig. 2) is designed to absorb the incident central light beam to form a dark field with a hollow center, and the annular light beam which is not absorbed forms a bright field distribution of the visual area 41 in the visible space.
The longitudinal depth range of the visual space visual area satisfies the expression:
wherein Z isflRepresenting the longitudinal depth range, r, on the central axis of the visual area in visual space1And r2The outer radius and the beam absorption radius of the film-coated conical lens are shown in FIG. 3, r1＞r2，naShowing the refractive index of the coated conical lens,
the characteristic angle of the coated conical lens is expressed in radian.
The customization of the visible space visual area 41 is complemented with the profile shaping characteristic of the light modulation module 4, the diameter characteristic of the film-covered conical lens adopted by the light modulation module 4 determines the longitudinal display depth of the illumination light beam of the visible space visual area 41, and also determines the profile shaping form and the directivity of the initial illumination light beamThe light source 3 may be formed by a common LED backlight, and for the light beams emitted by the same directional light source 3, the light beam profile not related to the profile shaping of the film-covered conical lens is shown in fig. 4, but the illumination light beam profile after the profile shaping is performed by the light modulation module 4 of the depth control directional illumination display system provided by this embodiment is shown in fig. 5, and the longitudinal depth range Z on the central axis of the visual area of the visual space is shown in fig. 5flIn the customized visual space region 41, the user can watch the image information loaded in the display module, and the user cannot receive the illumination light beam, the light beam absorption radius regulates and controls the position of a focal line formed in the longitudinal direction of the visual space region, and the illumination light beam of the visual space region is regulated and controlled in the longitudinal direction.
In this embodiment, the display module 5 adopts an optical film layer, an image is customized and displayed on the optical film layer or an LCD screen is used to display a real-time changing image, and the image loaded in the display module 5 does not affect the macroscopic depth characteristic of the illumination beam emitted after the distribution regulation and shaping. The scattering property of the optical film layer is extremely small or negligible, and static image information can be directly rubbed on the optical display film layer for static display.
Example 2
Referring to fig. 6, the present embodiment further provides a depth control directional illumination display method, which is implemented based on the depth control directional illumination display system described in embodiment 1, and includes the following steps:
s1, positioning the positions of the eyes of a user in a visual area of a visual space by using a human eye tracking module 2, and transmitting the position information of the eyes of the user to a central processing unit 1; at this time, the user is defaulted to have both eyes in the visual space.
S2, the central processing unit 1 analyzes the space angle and the depth of the two eyes of the user according to the position information of the two eyes to obtain the visual directions of the two eyes of the user, and guides the directional light source 3 to emit the illumination light beams directionally according to the visual directions of the two eyes of the user;
s3, transmitting the directional illumination light beam to an optical modulation module 4, carrying out distribution regulation and shaping on the directional illumination light beam by the optical modulation module 4, emitting the illumination light beam subjected to distribution regulation and shaping, then, entering a display module 5, carrying image information loaded in the display module 5, and then, entering a visible space visual area;
and S4, the user watches the image displayed by the display module 5 in the visual space visual area.
Preferably, the visible space viewing zone in step S1 is customized in advance according to the parameters of the light modulation module 4, where the light modulation module 4 is a coated conical lens, and the parameters include: outer radius r1Beam absorption radius r2Refractive index naAnd characteristic angle
The longitudinal depth range of the customized visual space visual area satisfies the expression:
wherein Z isflRepresenting the longitudinal depth range on the central axis of the visual area of the visual space; the transverse range of the customized visual space visual area is determined by the transverse range of the emergent light field of the illumination light beam after the light modulation module is distributed, regulated and shaped. And when the positions of the two eyes of the user are out of the monitoring range of the human eye tracking module, finishing the depth control directional lighting display.
Example 3
In this embodiment, in combination with the system provided in embodiment 1 and the method provided in embodiment 2, both eyes of a user are replaced with CCD cameras for simulation, a normalized light energy test experiment is performed, the directional light source 3 is a coherent light source, and light can be combined to form a white laser light source by using the RGB three primary color principle, such as using a light source with a wavelength of: red light (R) with a wavelength of 700.0nm, green light (G) with a wavelength of 546.1nm and blue light (B) with a wavelength of 435.8nm, which correspond to the RGB three primary color flux ratios: the standard white light (E) has a tricolor luminous flux ratio of 1: 4.5907: 0.0601, or generally, other illumination light colors needed by the ratio synthesis of the three primary color light fluxes can be designed. The light modulation module 4 used in the experiment was a refractive index naIs 1.46The incidence radius of the light-directing source 3 is 12.6mm, and the parameter r of the coated conical lens1And r212.6mm and 0.0001mm, respectively, and the modulated illumination distance in the experiment obtained was about 320 mm. Fig. 7 is a diagram showing the normalized light energy test results in a visual space visual area (bright area) and a non-visual space visual area (non-bright area), wherein the longitudinal depth range of the visual space visual area refers to the brightness range of the Z-axis, and the transverse range refers to the moving range of the X-axis. From the above theoretical calculation formula:
calculating ZflThe depth range of the longitudinal direction on the central axis is about 314mm, and the result has better conformity with the result tested in the experiment.
The display results of the depth-modulated illumination were further verified by taking pictures of the display at different longitudinal depths, as shown in fig. 8, taking pictures of the display experiment with the CCD camera at 90mm, 110mm, 150mm, 300mm, 400mm and 500mm in the axial direction, and the results were obtained: the display system with depth regulation realizes 90mm, 110mm, 150mm and 300mm in the Z axis of the customized visual space visual area 41
The picture is visualized, but the visualized view can not be formed at the positions of the non-visible space view areas 51 such as 400mm and 500mm, namely, the view area display with the set depth is formed, the display view can not be performed without the distribution of the illumination light beams, the system is mutually verified with the depth modulation illumination concept of the system design, namely, the system has the depth modulation function, the customized visible space view area 41 realizes illumination, and the non-customized illumination area 51 can not be displayed. On the other hand, if the light absorption surface of the light modulation module is introduced and the incident central beam is not absorbed, the focal line of the outgoing beam modulated and formed by the light modulation module 4 starts from the tip Z of the coated conical lens, which is 0, and if the beam absorption radius is designed, the position of the focal line formed by the Z axis can be modulated, such as starting from Z100 mm or 500 mm.
The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the present patent;
it should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A depth modulated directional illumination display system, comprising: the human eye tracking system comprises a central processing unit (1), a human eye tracking module (2), a directional light source (3), a light modulation module (4) and a display module (5); the human eye tracking module (2) is used for positioning the positions of the eyes of a user positioned in the visual space visual area, transmitting the position information of the eyes of the user to the central processing unit (1), the central processing unit (1) analyzes the space angle and the depth of the eyes of the user according to the position information of the eyes to obtain the visual direction of the eyes of the user, the directional light source (3) is guided to emit the illuminating light beams directionally according to the visual direction of the eyes of the user, the illuminating light beams are transmitted to the light modulation module (4), the light modulation module (4) performs distribution regulation and shaping on the illuminating light beams, the illuminating light beams after the distribution regulation and shaping are emitted to the display module (5), image information loaded into the display module (5) is carried, then the image information is emitted to the visual space visual area, and the user watches the image displayed by the display module (5) in the visual space visual area; the longitudinal depth range of the visual space visual area is determined by the parameters of the light modulation module (4), and the transverse range is determined by the transverse range of the emergent light field of the illumination light beam after the light modulation module (4) is distributed, regulated and shaped.
2. The depth modulated directional illumination display system of claim 1, wherein the directional light source (3) is a coherent light source or an incoherent light source.
3. The depth modulated directional lighting display system of claim 2 in which the light modulation module (4) is a coated conical lens.
4. The depth modulated directional lighting display system of claim 3 in which the size of the directional light source (3) is smaller than the size of the coated conical lens.
5. The depth-modulated directional illumination display system according to claim 3, wherein if the size of the directional light source (3) is larger than the size of the coated conical lens, an aperture stop or an equivalent element is added between the directional light source (3) and the coated conical lens for restricting the size of the directional light source.
6. The depth-control directional illumination display system according to claim 4 or 5, wherein the film-covered conical lens absorbs the incident central light beam of the illumination light beam by setting a light beam absorption radius to form a central hollow dark field, the unabsorbed annular illumination light beam forms a concentrated illumination light beam view field of the visible space view field after exiting, the light beam absorption radius controls a position of a focal line formed longitudinally of the visible space view field, and the illumination light beam of the visible space view field is controlled longitudinally; the longitudinal depth range of the visual space visual area satisfies the expression:
wherein Z isflRepresenting the longitudinal depth range, r, on the central axis of the visual area in visual space1And r2The outer radius and the beam absorption radius r of the film-coated conical lens1＞r2，naShowing the refractive index of the coated conical lens,
the characteristic angle of the coated conical lens is expressed in radian.
7. The depth-controlled directional illumination display system according to claim 1, wherein the display module (5) employs an optical film layer, an image is custom-displayed on the optical film layer or displayed by using an LCD screen to change the image in real time, and the image loaded on the display module (5) does not affect the macroscopic depth characteristic of the illumination beam emitted after the distribution-control shaping.
8. A depth control directional illumination display method is realized based on a depth control directional illumination display system, and comprises the following steps:
s1, positioning the positions of the eyes of a user in a visual space visual area by using an eye tracking module (2), and transmitting the position information of the eyes of the user to a central processing unit (1);
s2, the central processing unit (1) analyzes the space angle and the depth of the two eyes of the user according to the position information of the two eyes to obtain the visual direction of the two eyes of the user, and guides the directional light source (3) to emit the illumination light beams directionally according to the visual direction of the two eyes of the user;
s3, transmitting the directional illumination light beam to an optical modulation module (4), carrying out distribution regulation and shaping on the directional illumination light beam by the optical modulation module (4), emitting the illumination light beam subjected to distribution regulation and shaping, then, entering a display module (5), carrying image information loaded in the display module (5), and then, entering a visible space visual area;
and S4, the user watches the image displayed by the display module (5) in the visual space visual area.
9. The method of claim 8, wherein the visual space viewing zone of step S1 is customized in advance according to parameters of the light modulation module (4), the light modulation module (4) is a coated conical lens, and the parameters include: outer radius r1Beam absorption radius r2Refractive index naAnd characteristic angle
Customized longitudinal depth of visual space viewportThe range satisfies the expression:
wherein Z isflRepresenting the longitudinal depth range on the central axis of the visual area of the visual space; the transverse range of the customized visual space visual area is determined by the transverse range of the emergent light field of the illumination light beam after the light modulation module (4) distributes, regulates and shapes.
10. The depth-controlled directional illumination display method according to claim 9, wherein the depth-controlled directional illumination display is ended when the positions of both eyes of the user are out of the monitoring range of the eye tracking module (2).
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