A directional focusing projection display device and its directional illumination method for dynamic eye tracking

Abstract

This invention discloses a directional focusing projection display device and its method for dynamic eye tracking directional illumination. The directional focusing projection display device includes a directional uniform backlight module with dynamically adjustable beam direction, a liquid crystal display module, an eye spatial pose detection module, and a processor. The directional uniform backlight module includes a panel light source capable of being illuminated pixel by pixel, a microlens array, and an ultra-thin planar imaging optical element. The beam emitted from the pixels of the panel light source, after passing through the microlens unit, becomes a collimated uniform beam, which is then directionally focused by the ultra-thin planar imaging optical element to form an eye-tracking light spot. The liquid crystal display module displays a color image, and the eye spatial pose detection module detects the human eye and feeds back to the panel light source, which then displays a dot matrix corresponding to the current eye position, achieving eye tracking. The processor controls the panel light source in the directional uniform backlight module to display a specific pixel distribution.

Description

Technical Field

[0001] This invention relates to the field of flat panel displays, and more particularly to a directional focusing projection display device and a method for directional eye tracking illumination of the same. Background Technology

[0002] Flat panel displays play an important role in modern work and life. Among the many flat panel display devices, LCD flat panels are one of the most widely used and numerous devices. Research on LCD flat panel displays is constantly emerging, and various LCD flat panel products have received widespread attention and development in recent years, becoming increasingly integrated into people's lives.

[0003] LCD monitors are passive display panels, meaning they cannot actively emit light and lack light-emitting characteristics. They require a backlight module to provide illumination for viewing. Traditional backlight modules are generally divided into edge-lit backlights and direct-lit backlights, each with different characteristics. In edge-lit backlight modules, the LED light source is located on the side of the backlight module, with single-sided or double-sided LED arrangements. The backlight module includes optical components such as a light guide plate, upper and lower diffuser films, and brightness enhancement films. After the light emitted by the LED light source on the side of the light guide plate enters the light guide plate and undergoes multiple total internal reflections, it exits upwards from the light guide plate, exhibiting a large divergence angle, typically reaching 120°. The beam passes through the upper and lower diffuser films and brightness enhancement films, achieving large-area, high-brightness, and uniform backlight illumination. In direct-lit backlight modules, the LED light source is evenly arranged at the bottom of the backlight module, at a certain distance from the upper diffuser screen to facilitate light mixing, and then passes through optical components to achieve high-brightness and high-uniformity backlight illumination.

[0004] Traditional LCD backlight modules suffer from excessive beam divergence and poor collimation, resulting in viewing angles up to 120° and low energy efficiency, with most of the light falling on faces and other areas. Highly collimated light sources can provide higher on-axis brightness, which is of great practical significance for nighttime use. At night, traditional backlight modules exhibit excessive divergence, illuminating the entire face while other light outside the human eye contributes nothing to viewing. If the emitted beam could be focused entirely onto the eye, energy efficiency would be significantly improved. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a directional focusing projection display device and a human eye directional tracking illumination method thereof, which can provide uniform collimated backlight illumination and achieve directional focusing.

[0006] This invention is achieved through the following technical solution:

[0007] This invention first provides a directional focusing projection display device, the system comprising a directional uniform backlight module with dynamically adjustable output beam direction, a liquid crystal display module, a human eye spatial pose detection module, and a processor;

[0008] The dynamically adjustable directional uniform backlight module is used to generate large-area collimated uniform backlight illumination, and includes a panel light source that can be lit pixel by pixel, a microlens array, and an ultra-thin planar imaging optical element.

[0009] The panel light source, which can be lit pixel by pixel, illuminates the light source pixels according to the human eye spatial coordinates fed back by the processor.

[0010] The microlens array is composed of multiple microlens units arranged in two directions, horizontal and vertical, and is used to collimate and homogenize the light beam emitted from the light source pixel and provide large-area uniform backlight illumination to the liquid crystal display module.

[0011] The ultrathin planar imaging optical element is used to focus the light beam collimated and homogenized by the microlens array, and generate light spots at each predetermined position;

[0012] The liquid crystal display module is closely attached to the beam focusing side of the ultra-thin planar imaging optical element and is used to display color images;

[0013] The human eye spatial pose detection module is used to capture the human eye;

[0014] The processor receives the human eye image detected by the human eye spatial pose detection module, obtains the current spatial coordinates of the human eye, and feeds back the spatial coordinates of the human eye to the panel light source that can be lit pixel by pixel.

[0015] Secondly, the present invention also provides a human eye directional tracking illumination method based on the aforementioned directional focusing projection display device, which includes the following steps:

[0016] 1) The human eye spatial pose detection module and processor detect the position of the human eye to obtain the current spatial coordinates of the human eye and feed them back to the panel light source that can be lit pixel by pixel;

[0017] 2) The panel light source, which can be illuminated pixel by pixel, illuminates the light source pixel corresponding to the current human eye position;

[0018] 3) The light beam generated by the light source pixel is modulated in intensity and wavefront distribution by a microlens array, and then forms a large area of ​​uniform collimated outgoing light. This large area of ​​uniform collimated outgoing light provides a large area of ​​uniform backlight illumination for the liquid crystal display module, and after being modulated by an ultra-thin planar imaging optical element, it forms a converging spot at the current human eye.

[0019] 4) The human eye spatial pose detection module and processor detect human eye movement in real time, enabling the light spot to track and illuminate the human eye in a directional manner.

[0020] Compared to existing side-lit and direct-lit backlight modules and traditional LCD displays, this invention provides a dynamically adjustable directional uniform backlight module and a directional focusing projection display device. Based on the principle of freeform surface beam intensity and wavefront modulation and synergistic optimization, it achieves large-area collimated and uniform backlight illumination. Through the focusing effect of ultra-thin planar imaging optical elements, the illumination area is localized near the pupil, significantly improving the energy utilization rate of the display device. By controlling the pixel light sources on the panel light source that can be lit pixel by pixel, the movement of the eye-moving light spot can be realized; through the detection and tracking of the human eye by the human eye spatial pose detection module, the tracking of the eye-moving light spot to the human eye can be realized, thereby achieving multi-view directional focusing projection display. In summary, this invention, based on the designed dynamically adjustable directional uniform backlight module, used in conjunction with an LCD display module, and through the algorithm processing of the human eye spatial pose detection module and the processor, can achieve multi-view directional focusing projection display. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the directional focusing projection display device system structure;

[0022] Figure 2 This is a schematic diagram of a directional focused projection generated by a directional uniform backlight module with dynamically adjustable output beam direction in an embodiment of the present invention.

[0023] Figure 3 This is a schematic diagram of the microlens unit design in an example of the present invention;

[0024] Figure 4 This is an example of the illuminance distribution of the microlens array sampled on the illumination surface in this invention.

[0025] Figure 5 This is a schematic diagram of pixel control of a panel light source that can be lit pixel by pixel in an embodiment of the present invention.

[0026] Figure 6 This is a schematic diagram of human eye tracking in an example of the present invention. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described below in conjunction with the accompanying drawings.

[0028] Figure 1 This is a schematic diagram of the directional focusing projection display device system design of the present invention. Figure 1As shown, the invention includes a dynamically adjustable directional uniform backlight module 107, a liquid crystal display module 105, a human eye spatial pose detection module 106, and a processor 101. The dynamically adjustable directional uniform backlight module includes a panel light source 102 capable of illuminating pixels individually, a microlens array 103, and an ultra-thin planar imaging optical element or a focusing optical element 104.

[0029] The main functions of each component in the device of this invention are as follows: the panel light source, which can be illuminated pixel by pixel, illuminates the light source pixel according to the human eye spatial coordinates fed back by the processor; the microlens array is composed of multiple microlens units arrayed in two directions, horizontal and vertical, and is used to collimate and homogenize the light beam emitted from the light source pixel and provide large-area uniform backlight illumination to the liquid crystal display module; the ultra-thin planar imaging optical element is used to focus the light beam collimated and homogenized by the microlens array and generate light spots at each predetermined position; the liquid crystal display module is close to the beam focusing side of the ultra-thin planar imaging optical element and is used to display color images; the human eye spatial pose detection module 106 is used to capture the human eye; the processor 101 receives the human eye image detected by the human eye spatial pose detection module 106, obtains the current spatial coordinates of the human eye, and feeds back the spatial coordinates of the human eye to the panel light source, which can be illuminated pixel by pixel.

[0030] The pixel-by-pixel illuminateable panel light source includes, but is not limited to, backlit color LCD panels, backlit monochrome LCD panels, OLED panels, miniLED panels, etc.; the microlens array is formed by arranging multiple microlens units 1031 along two directions, horizontal and vertical; the surface shape of the microlens array is designed according to the direction of the emitted beam, the pixel size of the panel light source, and the distance requirements from the panel light source to the microlens array, including but not limited to freeform surfaces, aspherical surfaces, spherical surfaces, etc.; the material of the microlens array includes, but is not limited to, optical plastics, optical glass, liquid crystal lenses, etc., with a refractive index of 1.4 to 1.8; the ultrathin planar imaging optical element is a Fresnel lens or a holographic element, and its surface shape is designed according to the focusing depth, including but not limited to spherical surfaces, aspherical surfaces, freeform surfaces, etc.; the material of the ultrathin planar imaging optical element includes, but is not limited to, optical plastics, with a refractive index of 1.4 to 1.8. In this embodiment, the ultrathin planar imaging optical element is selected as a Fresnel lens.

[0031] The light-emitting pixels on the panel light source, which can be lit pixel by pixel, correspond one-to-one with the microlens array. That is, under a single microlens, the two light-emitting pixels are symmetrical with respect to the optical axis of the lens, which is the position of the first eye-tracking spot. Subsequently, the light emitted by the pixel light source is incident on the microlens array. After the intensity and wavefront shaping of the microlenses, it is collimated and uniform beam after exiting.

[0032] Furthermore, the collimated and homogenized light beam is incident on the toothed side of the ultrathin planar imaging optical element and converges to a specific position and height in space to form an eye-tracking light spot.

[0033] Furthermore, an optical flat plate is used to fix and support the microlens array, and the panel light source is located at the focal point of the microlens array. The optical flat plate is made of glass or optical plastic.

[0034] Furthermore, the liquid crystal display module displays color images. A panel light source capable of illuminating pixel by pixel is connected to the processor. The human eye spatial pose detection module captures the human eye and tracks it using algorithms, reading the current and subsequent spatial coordinates of the eye. These coordinates are fed back to the processor, which then refreshes the panel light source using algorithms, moving the pixels to the spatial position corresponding to the current human eye. The corresponding eye-tracking light spot also follows the human eye, achieving light spot tracking of the human eye. Furthermore, the liquid crystal display module is a color liquid crystal display screen. Furthermore, the human eye spatial pose detection module is a high frame rate camera or an infrared supplementary lighting camera.

[0035] Figure 2 This is a schematic diagram illustrating the directional focusing projection generated by the dynamically adjustable directional uniform backlight module in this invention. (See diagram for example.) Figure 2 As shown, the panel light source 102, which can illuminate pixel by pixel, illuminates pixel light sources 201, 202, and 203, and the pixel light sources 201, 202, and 203 are located on the optical axis of the microlens unit of the microlens array 103.

[0036] Furthermore, the light rays 2010, 2011 and 2012 emitted from pixel 201, the light rays 2020, 2021 and 2022 emitted from pixel 202, and the light rays 2030, 2031 and 2032 emitted from pixel 203 pass through the microlens array 103. After intensity adjustment and wavefront shaping by the microlens array 103, they become collimated and uniform light beams.

[0037] Furthermore, the light beam is incident on a Fresnel lens or other focusing optical element 104 and focused to the corresponding position in space.

[0038] Furthermore, light rays 2010, 2020, and 2030 converge to the same position; light rays 2011, 2021, and 2031 converge to the same position; and light rays 2012, 2022, and 2032 converge to the same position. The light spot 210 is the image formed by pixels 201, 202, and 203 through the Fresnel lens of the microlens array 103 or other focusing optical elements 104. The light spot 210 is the projection light spot of this directional focusing projection display system.

[0039] Furthermore, it should be noted that pixels 201, 202, and 203 are not limited to the optical axis of the microlens unit; pixels 201, 202, and 203 can be lit at any position within the panel's light source plane, but their positions relative to the microlens unit should be the same. The resulting projected focused light spot will then be at any position on the corresponding plane.

[0040] Furthermore, the microlens unit doesn't just illuminate a single pixel; to generate a pair of projected focused light spots, a pair of light source pixels under the microlens unit are often illuminated. Similarly, the positions of this pair of pixel light sources relative to the microlens unit should be identical. This will be illustrated later.

[0041] Figure 3 This is a schematic diagram of the microlens unit design in an example of the present invention. Figure 3 As shown, in this invention, the surface profile of a single microlens in a microlens array is designed based on the vector form of Snell's law and the principle of equal optical path length.

[0042]

[0043] Where n0 is the refractive index of the medium in which the microlens is located, which is usually air, i.e., n0 = 1; n is the refractive index of the material of the microlens array. Let be the unit vector of the incident ray, and let point P be a point on the incident surface of the microlens unit where the ray strikes. Let be the unit vector of the outgoing ray after refraction at the incident surface of the microlens unit. Let P be the unit normal vector, and Q be a vector. The intersection with the exit surface of the microlens unit.

[0044] Furthermore, the upper equation constrains the landing point of the emitted light from the microlens unit 1031, thus constraining the intensity distribution of the emitted light. The lower equation constrains the wavefront of the emitted light from the microlens unit 1031, ensuring that the emitted beam is collimated. This means that the three reference rays 310, 311, and 312 emitted by the light source pixel 301 are uniformly and parallelly arranged after being controlled by the microlens unit 1031. In this invention, since the emitted wavefront is a plane wave, point C in the equation is at infinity, and the solution can be obtained using the infinity approximation.

[0045] Figure 4 This is an illuminance distribution diagram on the illumination surface after sampling by the microlens array in an embodiment of the present invention. In this embodiment, as... Figure 2 As shown, the panel light source 102, which can illuminate pixels one by one, illuminates the pixels on the axis relative to the microlens unit. The distance between the panel light source 102 and the incident surface of the microlens array 103 is 1.8 mm. The thickness of the microlens array is 1 mm. The Fresnel lens 104 is in close contact with the microlens array and has a thickness of 1.05 mm.

[0046] Furthermore, in this embodiment, a 3×3 microlens array is obtained by sampling the microlens array for simulation testing. The array includes 3×3 light source pixels and 3×3 microlens array, and each unit is composed of light source pixels and microlens units. Figure 4 This is the illumination distribution map of the microlens array on the target surface after the light source pixels in the unit are illuminated, such as... Figure 4 The illuminance distribution on the illuminated surface is uniform, indicating that the backlight system has a high degree of uniformity.

[0047] Based on the aforementioned directional focusing projection display device, the present invention further provides a human eye directional tracking illumination method, which includes the following steps:

[0048] 1) The human eye spatial pose detection module and processor detect the position of the human eye to obtain the current spatial coordinates of the human eye and feed them back to the panel light source that can be lit pixel by pixel;

[0049] 2) The panel light source, which can be illuminated pixel by pixel, illuminates the light source pixel corresponding to the current human eye position;

[0050] 3) The light beam generated by the light source pixel is modulated in intensity and wavefront distribution by a microlens array, and then forms a large area of ​​uniform collimated outgoing light. This large area of ​​uniform collimated outgoing light provides a large area of ​​uniform backlight illumination for the liquid crystal display module, and after being modulated by an ultra-thin planar imaging optical element, it forms a converging spot at the current human eye.

[0051] 4) The human eye spatial pose detection module and processor detect human eye movement in real time, enabling the light spot to track and illuminate the human eye in a directional manner.

[0052] Select the central area of ​​the illuminated plane and calculate the average error to measure the uniformity of the illumination. The average error is the ratio of the standard deviation of illuminance to the average value of illuminance, and the calculation formula is as follows:

[0053]

[0054] Where σ is the standard deviation of illuminance, n is the number of sampled pixels, and x i Let be the illuminance value at the i-th sampled pixel. Let V be the average illuminance on the illuminated surface, and V be the average error of the illuminance. Then the illuminance uniformity is:

[0055] U = (1-V) × 100%

[0056] According to the formula, the illumination uniformity of the directional uniform backlight system in the embodiment of the present invention is 93.76% on the illumination plane. This shows that the directional uniform backlight system with dynamically adjustable output beam direction in the embodiment of the present invention has high uniformity and collimation, which meets the usage requirements of liquid crystal display devices and also meets the high requirements of human eye tracking for the backlight system in this embodiment of the invention.

[0057] Figure 5 This is a schematic diagram illustrating pixel control of a panel light source capable of illuminating pixel by pixel in an embodiment of the present invention. Figure 5 As shown, pixel positions 501, 502, 503, 504, 505, and 506 represent the adjustment range of the adjustable pixels covered by the microlens unit in the y-direction. Correspondingly, there are also adjustable pixels in the direction symmetrical to the figure. The movement of pixels covered by the microlens unit corresponds to the movement of the corresponding eye-tracking spot.

[0058] Furthermore, pixels 5010 and 5011, 5020 and 5021, 5030 and 5031, 5040 and 5041, 5050 and 5051, and 5060 and 5061, which are pixel light sources moving along the y-direction, correspond to eye-tracking spots at different positions. The movement from pixel position 506 to pixel position 501 can be seen as the movement process from the corresponding intermediate eye-tracking spot to the edge eye-tracking spot.

[0059] Furthermore, pixels 5010 and 5011, pixels 5020 and 5021, pixels 5030 and 5031, pixels 5040 and 5041, pixels 5050 and 5051, and pixels 5060 and 5061 can also move along the x-direction, that is, the corresponding eye-tracking spot moves in the y-direction.

[0060] Furthermore, pixels 5010 and 5011, pixels 5020 and 5021, pixels 5030 and 5031, pixels 5040 and 5041, pixels 5050 and 5051, and pixels 5060 and 5061 can also move simultaneously along the x and y directions, meaning that the corresponding eye-tracking spot can move at any position within the corresponding plane.

[0061] Figure 6 This is a schematic diagram of eye tracking in an example of the present invention. Figure 6 As shown, the human eye spatial pose detection module 106 identifies the human eye and tracks it through the human eye tracking algorithm. At this time, the directional uniform backlight module with dynamically adjustable output beam direction generates a pair of eye-moving light spots 601 to cover the human eye.

[0062] Furthermore, when the human eye follows Figure 6When the human eye moves in the center direction, the human eye spatial pose detection module 107 continuously tracks the human eye, reads the spatial coordinates of the human eye after movement through an algorithm, and feeds these spatial coordinates back to the processor. At this time, the panel light source, which can be lit pixel by pixel, refreshes pixels according to the spatial coordinates of the human eye movement, i.e. Figure 5 The moving pixels are shown in the image. (As shown in the image) Figure 6 As shown, when the human eye moves in the -y direction, eye-tracking spot 602 will refresh; when the human eye moves in the y direction, eye-tracking spot 603 will refresh. It should be emphasized that eye-tracking spots 602 and 603 always cover the human eye during this process, thus achieving the effect of eye-tracking spot tracking.

[0063] Furthermore, when the human eye moves in the x-direction, the human eye spatial pose detection module 107 keeps tracking the human eye, reads the spatial coordinates after the human eye moves through the algorithm, and feeds the spatial coordinates back to the processor. At this time, the panel light source that can be lit pixel by pixel refreshes the pixels according to the spatial coordinates after the human eye moves, and the corresponding eye movement light spot will also be refreshed.

[0064] Furthermore, when the human eye moves simultaneously along the x and y directions, the human eye spatial pose detection module 107 keeps tracking the human eye. The algorithm reads the spatial coordinates of the human eye after it moves and feeds the spatial coordinates back to the processor. At this time, the panel light source that can be lit pixel by pixel refreshes the pixels according to the spatial coordinates of the human eye after it moves. At this time, eye tracking can be performed on the human eye that has moved to any position in the corresponding plane.

[0065] In summary, by using a human eye spatial pose detection module and processor to achieve eye-tracking of the human eye with an eye-movement light spot, i.e. directional focusing, and in conjunction with the dynamically adjustable directional uniform backlight module and liquid crystal display module included in this invention, this invention can realize a high-quality, low-crosstalk directional focusing projection display system.

[0066] In this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, which includes not only the elements listed but also other elements not expressly listed.

[0067] In this document, the directional terms such as front, back, top, and bottom are defined based on the location of the components in the accompanying drawings and their relative positions to each other, solely for the purpose of clarity and convenience in expressing the technical solution. It should be understood that the use of these directional terms should not limit the scope of protection claimed in this application.

[0068] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A directional focusing projection display device, the device comprising a directional uniform backlight module (107) with dynamically adjustable output beam direction, a liquid crystal display module (105), a human eye spatial pose detection module (106), and a processor (101), characterized in that: The dynamically adjustable directional uniform backlight module is used to generate large-area collimated uniform backlight illumination, which includes a panel light source (102) that can be lit pixel by pixel, a microlens array (103), and an ultra-thin planar imaging optical element (104). The panel light source, which can be lit pixel by pixel, illuminates the light source pixels according to the human eye spatial coordinates fed back by the processor. The microlens array is composed of multiple microlens units (1031) arranged in two directions, horizontal and vertical, and is used to collimate and homogenize the light beam emitted from the light source pixel and provide large-area uniform backlight illumination to the liquid crystal display module. The ultrathin planar imaging optical element is used to focus the light beam collimated and homogenized by the microlens array, and generate light spots at each predetermined position; The liquid crystal display module is closely attached to the beam focusing side of the ultra-thin planar imaging optical element and is used to display color images; The human eye spatial pose detection module (106) is used to capture the human eye; The processor (101) receives the human eye image detected by the human eye spatial pose detection module (106), obtains the current spatial coordinates of the human eye, and feeds back the spatial coordinates of the human eye to the panel light source that can be lit pixel by pixel.

2. The directional focusing projection display device as described in claim 1, characterized in that, In the aforementioned directional uniform backlight module with dynamically adjustable output beam direction, the panel light source, microlens array, and ultra-thin planar imaging optical element that can be lit pixel by pixel are arranged in parallel. The panel light source, which can illuminate pixel by pixel, is placed at the focal point of the microlens array. The ultra-thin planar imaging optical element is closely attached to the light-emitting side of the microlens array. The microlens array is composed of multiple identical microlens units arranged in a two-dimensional direction. The design of a single microlens unit is based on the vector form of Snell's law and the principle of equal optical path.

3. The directional focusing projection display device as described in claim 2, characterized in that, The microlens array is fixedly supported by an optical flat plate, and the panel light source is located at the focal point of the microlens array. The optical flat plate is made of glass or optical plastic.

4. The directional focusing projection display device as described in claim 1, characterized in that, The panel light source that can illuminate pixel by pixel is a backlit color LCD panel, a backlit monochrome LCD panel, an OLED panel, or a miniLED panel.

5. The directional focusing projection display device as described in claim 1, characterized in that, The microlens array is made of optical plastic, optical glass, or liquid crystal lens, with a refractive index of 1.4 to 1.

8.

6. The directional focusing projection display device as described in claim 1, characterized in that, The material of the ultrathin planar imaging optical element is optical plastic with a refractive index of 1.4 to 1.

8.

7. The directional focusing projection display device as described in claim 1, characterized in that, The liquid crystal display module is a color liquid crystal display screen; the human eye spatial pose detection module is a high frame rate camera or an infrared fill light camera.

8. The directional focusing projection display device as described in claim 1, characterized in that, The surface shape of the microlens unit and the ultrathin planar imaging optical element is a freeform surface, an aspherical surface, or a spherical surface.

9. The directional focusing projection display device as described in claim 1, characterized in that, The ultrathin planar imaging optical element is a Fresnel lens or a holographic element.

10. A method for human eye directional tracking illumination based on the directional focusing projection display device according to claim 1, characterized in that... Includes the following steps: 1) The human eye spatial pose detection module and processor detect the position of the human eye to obtain the current spatial coordinates of the human eye and feed them back to the panel light source that can be lit pixel by pixel; 2) The panel light source, which can be illuminated pixel by pixel, illuminates the light source pixel corresponding to the current human eye position; 3) The light beam generated by the light source pixel is modulated in intensity and wavefront distribution by a microlens array, and then forms a large area of ​​uniform collimated outgoing light. This large area of ​​uniform collimated outgoing light provides a large area of ​​uniform backlight illumination for the liquid crystal display module, and after being modulated by an ultra-thin planar imaging optical element, it forms a converging spot at the current human eye. 4) The human eye spatial pose detection module and processor detect human eye movement in real time, enabling the light spot to directionally track and illuminate the human eye.

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