Stereoscopic display device based on multi-wavelength COB LED array

Abstract

The invention discloses a three-dimensional display device based on a multi-wavelength COB LED array, and relates to the field of LEDs. Comprising a COB substrate used for bearing an LED chip; the LED chip array is arranged on the COD substrate, the LED chip array comprises at least two groups of LED chips with light emitting wavelengths of lambda 1 and lambda 2, the LED chip group with the first wavelength of lambda 1 corresponds to left eye image display, and the LED chip group with the second wavelength of lambda 2 corresponds to right eye image display; the light emitting driving unit is used for mapping the left eye image signal to an LED chip set with the wavelength of lambda 1 to drive light emitting, and mapping the right eye image signal to an LED chip set with the wavelength of lambda 2 to drive light emitting; and an image processing unit that corrects and processes the light emission image. The two paths of images are high in spectral separation degree, so that left and right eye crosstalk is small, and the three-dimensional effect is clear and stable; when the system works, no high-frequency flicker exists, the watching comfort is improved, and eyestrain is not prone to being caused.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of LED, in particular to a stereoscopic display device based on multi-wavelength COB LED array. BACKGROUND

[0002] Stereoscopic display technology generally needs to provide different view angles of images for the left and right eyes of the observer to generate depth perception. Existing stereoscopic display methods mainly include the following categories:

[0003] 1. Stereoscopic display based on wearable optics: for example, polarized light passive 3D system (using polarized glasses and matching polarized screen) or active shutter 3D system (using electronic liquid crystal shutter glasses and synchronous refreshing display). These methods require the audience to wear special glasses or use special display screens. The disadvantages are that the active shutter glasses have complex structure, high price and are heavy, need battery power supply and are constantly turned on and off, which will cause frequent flicker and cause eye discomfort and fatigue of some audience; the polarized light scheme needs to cooperate with a polarized wave plate LED screen or a special polarized direction projector + metal screen, the system cost is high, and the left and right eye images each occupy half of the pixels, the stereoscopic resolution is reduced, and the color correction is also more complex.

[0004] 2. Naked eye stereoscopic display (autostereoscopic): for example, lenticular lens (grating lens, micro-lens array) screen or parallax barrier technology, which does not need to wear glasses to see the stereoscopic effect. This kind of technology adds optical microstructure in front of the display panel to guide the images of different viewpoints to the left and right eyes of the audience. However, its limitation is that each screen can only support a fixed number of viewpoints, and there is a problem of view angle jump: at non-pre-set angles, image distortion or double images (picture ghosting) will occur. On the other hand, these optical additional layers will reduce the brightness and resolution of the display (for example, lenticular lens and parallax barrier usually divide the pixels into two for left and right eyes), and may produce black stripes or cross interference visible to the naked eye, resulting in poor viewing experience.

[0005] 3. Multi-band spectrum separation stereoscopic display: in recent years, stereoscopic display schemes using spectrum multiplexing principle have appeared. For example, Dolby 3D and Infitec cinema system allow the left and right eyes to wear different optical filters to see different wavelengths / bands of light, thereby forming stereoscopic vision. This kind of scheme usually needs a projector to quickly switch different wavelength light sources, or uses a complex multi-layer filter combination, which puts higher requirements on system synchronization and filter manufacturing.

[0006] In summary, how to realize high-quality binocular parallax image separation on a flat self-luminous display screen in the simplest and lowest cost way is a problem in the field of stereoscopic display technology.

[0007] To this end, the application proposes a stereoscopic display device based on a multi-wavelength COB LED array. SUMMARY

[0008] The application aims to solve the problems existing in the prior art and proposes a stereoscopic display device based on a multi-wavelength COB LED array.

[0009] To achieve the above-mentioned purpose, the application adopts the following technical solutions:

[0010] The stereoscopic display device based on a multi-wavelength COB LED array comprises:

[0011] A COB substrate for carrying LED chips;

[0012] An array of LED chips arranged on the COD substrate, and the array of LED chips comprises at least two groups of LED chips with light-emitting wavelengths of λ1 and λ2, wherein the group of LED chips with the first wavelength λ1 corresponds to left-eye image display, and the group of LED chips with the second wavelength λ2 corresponds to right-eye image display;

[0013] A light-emitting driving unit for driving the group of LED chips with the wavelength λ1 to emit light according to the mapping of a left-eye image signal, and driving the group of LED chips with the wavelength λ2 to emit light according to the mapping of a right-eye image signal;

[0014] An image processing unit for correcting and processing the light-emitting image;

[0015] Wavelength-selective filter glasses to be worn on the human body, the left-eye lens of the filter glasses being highly transmissive to the wavelength λ1 and being cut off to the wavelength λ2, and the right-eye lens being highly transmissive to the wavelength λ2 and being cut off to the wavelength λ1, so as to realize spectral separation of the left and right eyes.

[0016] Preferably, the COB substrate adopts an aluminum nitride ceramic, a metal copper-clad plate or a glass substrate, the LED chips are directly bonded to the substrate through a flip-chip soldering process, and a transparent encapsulating gel containing scattering particles is coated on the surface to form a light mixing layer.

[0017] Preferably, the array of LED chips is arranged in an interlaced grid, an alternating row-column or a chessboard layout.

[0018] Preferably, the light-emitting driving unit adopts a multi-channel constant current source cooperating with high-frequency PWM dimming, the PWM frequency is > 2 kHz, and a temperature sensor is built in to adjust the driving current in real time to compensate for wavelength thermal drift.

[0019] Preferably, the light-emitting driving unit has a static driving mode and a frame sequence driving mode, the static driving mode is that a plurality of LED chips continuously emit light at the same time, each LED chip continuously displays a respective image in a light-emitting channel, and the frame sequence driving mode is that an LED chip array corresponding to a left eye image and an LED array corresponding to a right eye image alternately emit light.

[0020] Preferably, the image processing unit comprises a color gamut mapping module, and the left eye image and the right eye image are respectively subjected to metamerism correction, gamma correction and brightness equalization processing based on the response characteristics of human eye cone cells.

[0021] Preferably, the LED chip array comprises n groups of LED chips with different wavelengths λ1, λ2,..., λn, wherein a group of LED chips with a first wavelength λ1 corresponds to left eye image display, a group of LED chips with a second wavelength λ2 corresponds to right eye image display, and the remaining LED chips with wavelengths λ3-λn synchronously emit light with the group of LED chips with the wavelength λ1 and / or the group of LED chips with the wavelength λ2 to form a left eye image or a right eye image. n n Preferably, the LED chip array comprises 3 groups of LED chips with different wavelengths λ1, λ2 and λ3, a left eye filter of wavelength-selective filter glasses projects a λ1+λ3 wave band to form a left eye image, and a right eye filter of the wavelength-selective filter glasses projects a λ2+λ3 wave band to form a left eye image.

[0022] Preferably, the left eye lens and the right eye lens of the wavelength-selective filter glasses are both formed by a plurality of layers of dielectric interference films, the lens thicknesses of the left eye lens and the right eye lens are different, and the left eye lens and the right eye lens have different light transmittable spectra for red, green and blue three primary colors.

[0023] Preferably, the left eye lens and the right eye lens of the wavelength-selective filter glasses are both formed by a plurality of layers of dielectric interference films, the lens thicknesses of the left eye lens and the right eye lens are different, and the left eye lens and the right eye lens have different light transmittable spectra for red, green and blue three primary colors.

[0024] The present application has the following advantages:

[0025] 1. The structure of the present application greatly simplifies the implementation of the stereoscopic display screen, without the need to add any micro-optical structure in front of the display panel, nor the need for expensive and complex polarized optical devices or electronic shutter devices; the present application fully utilizes the high-density COB packaging and high-efficiency heat dissipation to realize high-brightness and high-pixel-density display output, and is suitable for use in outdoor strong light environment.

[0026] 2. The present application has high spectral separation degree of two-way image and small left-right eye crosstalk, and the stereoscopic effect is clear and stable; the system does not have high-frequency flicker during operation, and the viewing comfort is improved, and eye fatigue is not easily caused.

[0027] 3. The present application expands to color stereoscopic display by increasing the number of light-emitting channels or skillfully selecting wavelength combinations, for example, adding three kinds of wavelength LED chips and using corresponding filters, so that the left eye and the right eye each receive different combinations of two colors, and then the brain fuses a full-color 3D image.​ Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the framework of the stereoscopic display device based on a multi-wavelength COB LED array proposed in this invention;

[0029] Figure 2 This is a schematic diagram of the array position of the stereoscopic display device based on a multi-wavelength COB LED array proposed in this invention;

[0030] Figure 3 This is a schematic diagram of the filtering principle of the stereoscopic display device based on a multi-wavelength COB LED array proposed in this invention. Detailed Implementation

[0031] The technical solution of the present invention will be further described in detail below with reference to specific embodiments.

[0032] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection or setting, a detachable connection or setting, or an integral connection or setting. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0033] Example 1:

[0034] A stereoscopic display device based on a multi-wavelength COB LED array, comprising:

[0035] COB substrate, which is used to carry LED chips;

[0036] The LED chip array is arranged on a COD substrate and includes at least two sets of LED chips with emission wavelengths of λ1 and λ2, wherein the first set of LED chips with wavelength λ1 corresponds to the left eye image display and the second set of LED chips with wavelength λ2 corresponds to the right eye image display.

[0037] The light-emitting driving unit maps the left-eye image signal to an LED chip group with wavelength λ1 to drive light emission, and maps the right-eye image signal to an LED chip group with wavelength λ2 to drive light emission.

[0038] The image processing unit corrects and processes the luminescent image;

[0039] Wavelength selective filter glasses are worn on the human body. The left eye lens of the filter glasses has high transmittance of the λ1 band and cut off the λ2 band, while the right eye lens has high transmittance of the λ2 band and cut off the λ1 band, thus achieving spectral separation between the left and right eyes.

[0040] Example 2:

[0041] A stereoscopic display device based on multi-wavelength COB LED array, comprising:

[0042] A COB substrate for carrying LED chips;

[0043] An LED chip array arranged on the COD substrate, and the LED chip array comprises at least two groups of LED chips with light-emitting wavelengths of λ1 and λ2 respectively, wherein the group of LED chips with the first wavelength λ1 corresponds to left-eye image display, and the group of LED chips with the second wavelength λ2 corresponds to right-eye image display;

[0044] A light-emitting driving unit for driving the group of LED chips with the wavelength λ1 to emit light according to the left-eye image signal and driving the group of LED chips with the wavelength λ2 to emit light according to the right-eye image signal;

[0045] An image processing unit for correcting and processing the light-emitting image;

[0046] Wavelength-selective filter glasses worn on the human body, the left-eye lens of the filter glasses is highly transmissive to the wavelength band λ1 and cut off the wavelength band λ2, and the right-eye lens is highly transmissive to the wavelength band λ2 and cut off the wavelength band λ1, so as to realize the spectral separation of the left and right eyes.

[0047] The COB substrate adopts an aluminum nitride ceramic glass substrate, the LED chips are directly bonded to the substrate through a flip-chip welding process, and a transparent encapsulating gel containing scattering particles is coated on the surface to form a light mixing layer.

[0048] Embodiment 3:

[0049] A stereoscopic display device based on multi-wavelength COB LED array, comprising:

[0050] A COB substrate for carrying LED chips;

[0051] An LED chip array arranged on the COD substrate, and the LED chip array comprises at least two groups of LED chips with light-emitting wavelengths of λ1 and λ2 respectively, wherein the group of LED chips with the first wavelength λ1 corresponds to left-eye image display, and the group of LED chips with the second wavelength λ2 corresponds to right-eye image display;

[0052] A light-emitting driving unit for driving the group of LED chips with the wavelength λ1 to emit light according to the left-eye image signal and driving the group of LED chips with the wavelength λ2 to emit light according to the right-eye image signal;

[0053] An image processing unit for correcting and processing the light-emitting image;

[0054] Wavelength selective filter glasses are worn on human body, left eye lens of the filter glasses is high transmittance to lambda 1 band and cut off lambda 2 band, right eye lens is high transmittance to lambda 2 band and cut off lambda 1 band, realizing spectrum separation of left and right eyes.

[0055] The COB substrate adopts a metal copper-clad plate, the LED chip is directly bonded to the substrate through a flip-chip welding process, and a transparent encapsulating glue body containing scattering particles is coated on the surface to form a light mixing layer.

[0056] Embodiment 4:

[0057] A stereoscopic display device based on a multi-wavelength COB LED array comprises:

[0058] A COB substrate for carrying LED chips;

[0059] An LED chip array arranged on the COD substrate, and the LED chip array comprises at least two groups of LED chips with light emitting wavelengths of lambda 1 and lambda 2 respectively, wherein the group of LED chips with the first wavelength lambda 1 corresponds to left eye image display, and the group of LED chips with the second wavelength lambda 2 corresponds to right eye image display;

[0060] A light emitting driving unit for driving the group of LED chips with the wavelength lambda 1 to emit light according to the left eye image signal and driving the group of LED chips with the wavelength lambda 2 to emit light according to the right eye image signal;

[0061] An image processing unit for correcting and processing the light emitting image;

[0062] Wavelength selective filter glasses are worn on human body, left eye lens of the filter glasses is high transmittance to lambda 1 band and cut off lambda 2 band, right eye lens is high transmittance to lambda 2 band and cut off lambda 1 band, realizing spectrum separation of left and right eyes.

[0063] The COB substrate adopts a glass substrate, the LED chip is directly bonded to the substrate through a flip-chip welding process, and a transparent encapsulating glue body containing scattering particles is coated on the surface to form a light mixing layer.

[0064] Embodiment 5:

[0065] A stereoscopic display device based on a multi-wavelength COB LED array comprises:

[0066] A COB substrate for carrying LED chips;

[0067] An LED chip array arranged on the COD substrate, and the LED chip array comprises at least two groups of LED chips with light emitting wavelengths of lambda 1 and lambda 2 respectively, wherein the group of LED chips with the first wavelength lambda 1 corresponds to left eye image display, and the group of LED chips with the second wavelength lambda 2 corresponds to right eye image display;

[0068] a light emitting driving unit, which drives the light emitting of the LED chip group corresponding to the left eye image signal at the wavelength λ1 and the light emitting of the LED chip group corresponding to the right eye image signal at the wavelength λ2;

[0069] an image processing unit, which corrects and processes the light emitting image;

[0070] wavelength selective filter glasses, which are worn on the human body, the left eye lens of the filter glasses being high in transmittance for the wavelength λ1 and being cut off for the wavelength λ2, and the right eye lens being high in transmittance for the wavelength λ2 and being cut off for the wavelength λ1, so as to realize the spectrum separation of the left and right eyes.

[0071] The COB substrate adopts an aluminum nitride ceramic, a metal copper-clad plate or a glass substrate, the LED chip is directly bonded to the substrate through a flip-chip welding process, and a transparent encapsulating colloid containing scattering particles is covered on the surface to form a light mixing layer.

[0072] The arrangement mode of the LED chip array is an interlaced grid.

[0073] Embodiment 6:

[0074] A stereoscopic display device based on a multi-wavelength COB LED array, comprising:

[0075] a COB substrate for carrying the LED chip;

[0076] an LED chip array, which is arranged on the COD substrate, and the LED chip array comprises at least two groups of LED chips with light emitting wavelengths of λ1 and λ2, wherein the group of LED chips with the first wavelength λ1 corresponds to the left eye image display, and the group of LED chips with the second wavelength λ2 corresponds to the right eye image display;

[0077] a light emitting driving unit, which drives the light emitting of the LED chip group corresponding to the left eye image signal at the wavelength λ1 and the light emitting of the LED chip group corresponding to the right eye image signal at the wavelength λ2;

[0078] an image processing unit, which corrects and processes the light emitting image;

[0079] wavelength selective filter glasses, which are worn on the human body, the left eye lens of the filter glasses being high in transmittance for the wavelength λ1 and being cut off for the wavelength λ2, and the right eye lens being high in transmittance for the wavelength λ2 and being cut off for the wavelength λ1, so as to realize the spectrum separation of the left and right eyes.

[0080] The COB substrate adopts an aluminum nitride ceramic, a metal copper-clad plate or a glass substrate, the LED chip is directly bonded to the substrate through a flip-chip welding process, and a transparent encapsulating colloid containing scattering particles is covered on the surface to form a light mixing layer.

[0081] The arrangement mode of the LED chip array is an interlaced grid.

[0082] Embodiment:

[0083] A stereoscopic display device based on multi-wavelength COB LED array, comprising:

[0084] A COB substrate for carrying LED chips;

[0085] An LED chip array arranged on the COD substrate, and the LED chip array comprises at least two groups of LED chips with light-emitting wavelengths of λ1 and λ2 respectively, wherein the group of LED chips with the first wavelength λ1 corresponds to left-eye image display, and the group of LED chips with the second wavelength λ2 corresponds to right-eye image display;

[0086] A light-emitting driving unit for driving the group of LED chips with the wavelength λ1 to emit light according to the left-eye image signal and driving the group of LED chips with the wavelength λ2 to emit light according to the right-eye image signal;

[0087] An image processing unit for correcting and processing the light-emitting image;

[0088] Wavelength-selective filter glasses worn on the human body, the left-eye lens of the filter glasses has high transmittance to the wavelength band λ1 and is cut off to the wavelength band λ2, and the right-eye lens has high transmittance to the wavelength band λ2 and is cut off to the wavelength band λ1, so as to realize spectral separation of the left and right eyes.

[0089] The COB substrate is made of aluminum nitride ceramic, metal copper-clad plate or glass substrate, the LED chips are directly bonded to the substrate through flip-chip welding process, and a light mixing layer is formed by covering the surface with transparent encapsulating glue containing scattering particles.

[0090] The arrangement mode of the LED chip array is a chessboard layout.

[0091] Embodiment 8:

[0092] A stereoscopic display device based on multi-wavelength COB LED array, comprising:

[0093] A COB substrate for carrying LED chips;

[0094] An LED chip array arranged on the COD substrate, and the LED chip array comprises at least two groups of LED chips with light-emitting wavelengths of λ1 and λ2 respectively, wherein the group of LED chips with the first wavelength λ1 corresponds to left-eye image display, and the group of LED chips with the second wavelength λ2 corresponds to right-eye image display;

[0095] A light-emitting driving unit for driving the group of LED chips with the wavelength λ1 to emit light according to the left-eye image signal and driving the group of LED chips with the wavelength λ2 to emit light according to the right-eye image signal;

[0096] An image processing unit for correcting and processing the light-emitting image;

[0097] Wavelength selective filter glasses, which are worn on human body, the left eye lens of the filter glasses has high transmittance for λ1 band and cut-off for λ2 band, and the right eye lens has high transmittance for λ2 band and cut-off for λ1 band, so as to realize the spectral separation of left and right eyes.

[0098] The COB substrate adopts aluminum nitride ceramic, metal copper-clad plate or glass substrate, the LED chip is directly bonded on the substrate through flip-chip welding process, and the surface is covered with transparent encapsulating glue containing scattering particles to form a light mixing layer.

[0099] The arrangement mode of the LED chip array is staggered grid, row-column alternation or chessboard layout.

[0100] The light-emitting driving unit adopts multi-channel constant current source cooperating with high-frequency PWM dimming, the PWM frequency is >2kHz, and a temperature sensor is built-in to adjust the driving current in real time to compensate for the wavelength thermal drift.

[0101] The light-emitting driving unit has static driving and frame sequence driving modes, the static driving mode is that a plurality of LED chips emit light simultaneously, and each LED chip continuously displays a respective image in the light-emitting channel, and the frame sequence driving mode is that the LED chip array corresponding to the left eye image and the LED array corresponding to the right eye image emit light alternately.

[0102] The image processing unit includes a color gamut mapping module, which respectively corrects the left and right eye images based on the response characteristics of human eye cone cells, performs same-color different spectrum correction, gamma correction and brightness equalization processing.

[0103] The LED chip array includes n groups of LED chips with different wavelengths λ1, λ2,..., λ n , wherein the first wavelength λ1 LED chip group corresponds to left eye image display, the second wavelength λ2 LED chip group corresponds to right eye image display, and the other λ3-λ n LED chips, wherein one or more of them synchronously emit light with the LED chip group with wavelength λ1 and / or λ2 to form left eye image or right eye image.

[0104] Embodiment 9:

[0105] The stereoscopic display device based on the multi-wavelength COB LED array comprises:

[0106] A COB substrate for carrying the LED chip;

[0107] An LED chip array arranged on the COD substrate, and the LED chip array includes at least two groups of LED chips with light-emitting wavelengths λ1 and λ2, wherein the first wavelength λ1 LED chip group corresponds to left eye image display, and the second wavelength λ2 LED chip group corresponds to right eye image display.

[0108] a light emitting driving unit, which drives light emitting of the LED chip group corresponding to the left eye image signal at λ1 wavelength and light emitting of the LED chip group corresponding to the right eye image signal at λ2 wavelength;

[0109] an image processing unit, which corrects and processes the light emitting image;

[0110] wavelength selection filter glasses, which are worn on the human body, the left eye lens of the filter glasses having high transmittance to λ1 wavelength and cutting off λ2 wavelength, and the right eye lens having high transmittance to λ2 wavelength and cutting off λ1 wavelength, so as to realize spectrum separation of the left and right eyes.

[0111] The COB substrate is made of aluminum nitride ceramic, metal copper clad plate or glass substrate, the LED chip is directly bonded to the substrate through flip-chip welding process, and the surface is covered with transparent encapsulating glue containing scattering particles to form a light mixing layer.

[0112] The arrangement mode of the LED chip array is staggered grid, row-column alternation or chessboard layout.

[0113] The light emitting driving unit adopts multi-channel constant current source cooperating with high-frequency PWM dimming, the PWM frequency is greater than 2 kHz, and a temperature sensor is built-in to adjust the driving current in real time to compensate for the wavelength thermal drift.

[0114] The light emitting driving unit has static driving and frame sequence driving modes, the static driving mode is that a plurality of LED chips emit light simultaneously and continuously, and each LED chip emits light in a channel to display a respective image, and the frame sequence driving mode is that the LED chip array corresponding to the left eye image and the LED array corresponding to the right eye image emit light alternately.

[0115] The image processing unit includes a color gamut mapping module, which respectively corrects the left and right eye images based on the response characteristics of human eye cone cells, performs metamerism correction, gamma correction and brightness equalization processing.

[0116] The LED chip array includes n groups of LED chips with different wavelengths λ1, λ2, …, λ n , wherein the LED chip group with the first wavelength λ1 corresponds to left eye image display, the LED chip group with the second wavelength λ2 corresponds to right eye image display, and the LED chips with wavelengths λ3-λ n , wherein one or more of the LED chips are synchronously emitted with the LED chip group with wavelength λ1 and / or λ2 to form a left eye image or a right eye image.

[0117] Embodiment 10:

[0118] The stereoscopic display device based on the multi-wavelength COB LED array comprises:

[0119] a COB substrate for carrying the LED chip;

[0120] an LED chip array arranged on the COB substrate, and the LED chip array comprises at least two groups of LED chips with light-emitting wavelengths of λ1 and λ2 respectively, wherein the group of LED chips with the first wavelength λ1 corresponds to left-eye image display, and the group of LED chips with the second wavelength λ2 corresponds to right-eye image display;

[0121] a light-emitting driving unit for driving the group of LED chips with the wavelength λ1 to emit light according to the mapping of the left-eye image signal, and driving the group of LED chips with the wavelength λ2 to emit light according to the mapping of the right-eye image signal;

[0122] an image processing unit for correcting and processing the light-emitting image;

[0123] wavelength-selective filtering glasses worn on the human body, the left-eye lens of the filtering glasses has high transmittance to the wavelength λ1 and is cut off to the wavelength λ2, and the right-eye lens has high transmittance to the wavelength λ2 and is cut off to the wavelength λ1, so as to realize the spectral separation of the left and right eyes.

[0124] The COB substrate is made of aluminum nitride ceramic, metal copper-clad plate or glass substrate, the LED chips are directly bonded to the substrate through flip-chip welding process, and the surface is covered with transparent encapsulating glue containing scattering particles to form a light mixing layer.

[0125] The arrangement mode of the LED chip array is staggered grid, row-column alternation or chessboard layout.

[0126] The light-emitting driving unit adopts multi-channel constant current source combined with high-frequency PWM dimming, the PWM frequency is greater than 2 kHz, and a temperature sensor is built in to adjust the driving current in real time to compensate for the wavelength thermal drift.

[0127] The light-emitting driving unit has a static driving mode and a frame sequence driving mode, the static driving mode is that a plurality of LED chips emit light simultaneously, and each LED chip continuously displays its own image in the light-emitting channel, and the frame sequence driving mode is that the LED chip array corresponding to the left-eye image and the LED array corresponding to the right-eye image emit light alternately.

[0128] The image processing unit comprises a color gamut mapping module, and the left-eye image and the right-eye image are respectively subjected to metamerism correction, gamma correction and brightness equalization processing based on the response characteristics of the human eye cone cells.

[0129] The left-eye lens and the right-eye lens of the wavelength-selective filtering glasses are both composed of multi-layer dielectric interference films, and the lens thicknesses of the left and right eyes are different, and the corresponding left-eye lens and right-eye lens have different transmittable spectra for red, green and blue three primary colors.

[0130] In the above embodiments:

[0131] The image processing unit can perform necessary pre-processing on the left and right eye images, such as color space conversion, brightness correction and encoding, to adapt to the light efficiency difference of different light emitting bands. The driving circuit adopts a synchronous or time-sharing control mode: it can be selected to let the λ1 and λ2 two LED sub-arrays emit light at the same time (by static driving, each LED channel continuously displays the respective image), or it can also adopt a frame sequence driving mode (the LED arrays corresponding to the left and right eye images are alternately flashed at high speed). For most implementations, since the channels are separated by the filter glasses, the LEDs of the two wavelengths can be continuously lit at the same time without high-speed switching like active shutters, thereby avoiding the flicker that can be perceived by the naked eye and improving the brightness utilization rate.

[0132] The matching stereoscopic glasses realize the separation of the left and right eye light channels through special filter lenses. The left eye lens is made of a narrow-band band-pass filter with high transmittance for wavelength λ1 but high blocking for λ2; the right eye lens is the opposite, with high transmittance for λ2 and blocking for λ1. The filter can be made by coating multiple layers of dielectric interference film on an optical glass substrate, and each filter lens has a specific high-transmittance window for a certain wavelength band and a cutoff characteristic for other wavelengths. For example, the left eye filter can be designed to have a narrow-band transmittance peak near λ1 = 620 nm (red light), and the right eye filter can be designed to have a narrow-band transmittance peak near λ2 = 530 nm (green light). The peak transmittance of the lenses for their respective wavelengths can reach more than 90%, while the transmittance for the complementary wavelengths is reduced to less than 1%, achieving complete separation of the left and right eye image signals. The filter lenses themselves do not require power driving, are light in weight and low in cost, and are suitable for long-term wear.

[0133] When the audience wears the above-mentioned light-splitting filter glasses to watch the picture emitted by the COB LED array, the left eye can only see the image emitted by the λ1 band LED chip through the filter, and the right eye can only see the image emitted by the λ2 band LED chip. Since the pictures seen by the left and right eyes are derived from slightly different perspective images, the brain fuses them to produce a realistic sense of stereoscopic depth. Compared with traditional shutter 3D, the left and right eye images of the present application are presented continuously at the same time, so the vision is more stable and there is no frequency flicker; compared with polarization 3D or grating naked-eye 3D, the present system does not have the problem of pixel resolution being divided, and each of the left and right eyes obtains a complete resolution image, with higher brightness and image quality not limited by the viewing angle.

[0134] In this stereoscopic display system, a series of pre-processing is needed to ensure the left and right eye images maintain accurate color and brightness after being encoded by different wavebands. In terms of color gamut mapping, since the left and right eye use different central wavelengths of red, green and blue primaries (e.g. left eye uses 629nm red, 532nm green, 446nm blue; right eye uses 615nm red, 518nm green, 432nm blue), color mapping models must be established for these two groups of primary colors. The perception of color by the three types of cone cells in the human eye depends on the combination of light stimuli of different wavebands, but is not sensitive to small differences in wavelength. Therefore, the method of metamerism correction can be used: by calculating the equivalent stimulus values of the left and right eye primary color spectra in standard colorimetry, a color conversion matrix or lookup table is constructed to adjust the RGB values of the left and right eye images respectively, so that the overall color after fusion by the audience's two eyes is consistent with the original target color. In particular, the difference in sensitivity of the human eye to different wavelengths needs to be compensated: for example, the human eye is relatively insensitive to deep blue light of 432nm, so the brightness of the color component of this waveband in the right eye image needs to be increased; at the same time, the human eye may be slightly more sensitive to 615nm than to 629nm, so a corresponding balance is also needed. Through such color gamut mapping and white balance adjustment, the left and right eye images can present consistent color perception after being filtered by their respective narrowband filters, and there will be no color deviation in one eye.

[0135] Gamma correction is also indispensable in this system. Since the brightness and current characteristics of LED emission are usually nonlinear, and the luminous efficiency and response curve of different wavelength LEDs may be different, gamma correction and grayscale calibration need to be performed for each color channel. By establishing a gamma correction curve for each of the left and right eyes, it is ensured that the grayscale transitions of the two eye images are consistent within the full brightness range, avoiding light and dark mismatches caused by waveband differences. In addition, considering that the left and right eye images are ultimately fused in the brain, brightness equalization is crucial. The system will compare the average brightness of the left and right eye images and automatically adjust the driving current or pixel brightness scaling to make the total light flux received by the left and right eyes generally equal, avoiding visual discomfort caused by one eye being too bright or too dark. This brightness equalization also needs to be modified in combination with the spectral luminous efficiency function of the human eye. For example, the human eye is extremely sensitive to the green waveband and relatively insensitive to deep red and deep blue. Therefore, the output of the 532nm green channel in the left eye image may be appropriately reduced, and the output of the 432nm blue channel in the right eye image may be appropriately increased to compensate for the difference in perception. After the above image processing algorithms, including color gamut mapping, gamma correction, waveband encoding adaptation and brightness equalization, the system can maximize the consistency of color and brightness in perception between the left and right eye presented images, allowing the audience to have a natural and comfortable stereoscopic visual experience.

[0136] Because the left and right eyes use spectral multiplexing display, each image contains red, green and blue components completely, but there is a slight shift in spectrum, so the color reproduction performance is better than that of traditional two-color (such as red and blue) glasses. The spectral separation technology greatly improves the color reproduction of the left and right eye images, overcoming the defects of serious color deviation and large brightness loss of red-green / red-blue filtering method. At the same time, since the human eye cannot distinguish extremely subtle wavelength differences, only the filtering glasses can strictly separate the two images, which makes the left and right eye images after algorithm correction not only achieve good color matching, but also achieve high channel isolation through narrow-band filters, ensuring clear and no crosstalk stereo effect.

[0137] The core light-emitting component of the system uses a COB (Chip On Board) multi-wavelength LED array. In order to achieve the three primary color output of different wavebands of the left and right eyes as described above, the LED bare chips of each color waveband need to be carefully selected. For example, the red light chip needs to cover two center wavelengths of about 615 nm and 630 nm, the green light about 518 nm and 532 nm, and the blue light about 432 nm and 446 nm. When selecting, not only the center wavelength needs to be considered to meet the requirements, but also the spectral half width (FWHM) of the chip needs to be considered to be narrow and the spectral consistency needs to be good, in order to reduce the ghost caused by spectral overlap between different channels. At the same time, high-efficiency chips need to be selected, especially deep blue (about 432 nm) chips, because the human eye has low sensitivity and the efficiency of this waveband LED is low, a model with high luminous efficiency or capable of withstanding high current drive should be selected, and the output can be improved by increasing the size or number of chips. In addition, the main wavelength tolerance of each chip also needs to be strictly controlled; in production, the LED chips will be wavelength distinguished to ensure that the wavelength deviation of the chips packaged in the same batch is within ±1-2 nm of the target value, reducing the inconsistency of the left and right eye channels from the source.

[0138] Precise bonding and flip-chip technology: In the packaging process, first use high-speed die bonding equipment to precisely position multiple selected bare chips on the PCB substrate, metal substrate or glass substrate at the predetermined pixel pad area. COB packaging eliminates the traditional SMD support, and the chip is directly attached to the board and fixed by conductive adhesive or solder paste. The system uses flip-chip technology, that is, the LED chip is face down, directly metal bonded with the substrate pad, so that wire bonding is not needed. Flip-chip bonding is usually completed by reflow soldering, which needs to accurately control the temperature curve of each area to ensure that different size chips can be reliably soldered without displacement. Flip-chip technology eliminates gold wire shading, reduces packaging thickness and parasitic resistance and inductance, and provides a better heat path. For some waveband chips (such as deep red and deep blue), flip-chip may not be supported temporarily, and normal + gold wire bonding can be used, but micro-shrunk wire layout needs to be paid attention to in order to reduce the impact on light.

[0139] Light mixing layer design: When multiple chips of different colors are co-packaged in one pixel, the light needs to be mixed through the design of the packaging glue. In this system, the entire chip surface is encapsulated with high-transparency organic silicone glue or epoxy resin. A small amount of micro-nano scattering particles can be introduced into the glue to form a light mixing layer, which can scatter the light beams emitted by each chip and achieve uniform mixing of the light field at close range. This can avoid the problem of perceiving the separation of different color points in one pixel when the audience observes the screen at close range. The thickness and scattering particle size of the light mixing layer are optimized to ensure sufficient mixing without significantly reducing brightness and resolution. Meanwhile, the packaging surface is flattened to achieve a smooth surface that is flush with the substrate, which improves the uniformity of the pixel light and enhances the protection performance of the package.

[0140] Thermal design and simulation: Multi-chip high-density packaging brings high power density and heat concentration. To ensure the working life and wavelength stability of the LED, excellent heat dissipation design is needed. First, the substrate is made of high-thermal-conductivity materials (such as aluminum substrate, ceramic substrate, glass substrate, etc.), and a heat sink path is designed below the chip, such as a metal-filled via that quickly conducts heat to the back heat sink. Thermal simulation analysis of the packaging structure is crucial. Finite element software is used to simulate the temperature field of the LED array under working conditions and analyze the temperature rise of the hottest pixel. To address the hot spots, the thickness of the copper foil, the bottom heat pad, or the thermal interface material connected to the heat sink on the back of the PCB can be used to reduce the temperature. The simulation results guide us to set a margin for the driving current and, if necessary, to reduce the maximum brightness of the continuous full-white screen to avoid overheating by controlling power consumption. In addition, the thermal design also considers the impact of thermal stress on the reliability of the package, and the packaging material needs to match the thermal expansion coefficient to prevent cracks caused by temperature cycling. Through the above processes and designs, the system realizes the high-density integration of multi-wavelength chips in COB packaging, with advantages such as small pixel pitch, high protection, good heat dissipation, etc., providing a solid foundation for the optical performance and reliability of the stereoscopic display.

[0141] The driving control system of the stereoscopic display screen needs to face the complex driving requirements of multiple channels and devices. Each pixel contains three colors for the left eye and the right eye, a total of six light-emitting chips, which require independent current driving channels. Therefore, a multi-channel constant current driving scheme is adopted in the design, with each wavelength sub-channel controlled by a dedicated constant current source to ensure consistent brightness. The driving circuit usually exists in the form of a column driving chip array, such as a custom LED driving IC that can provide hundreds of constant current outputs at a time, meeting the needs of high-resolution screens. To achieve grayscale control, the driving system combines high-frequency PWM dimming technology: by modulating the constant current source at high speed, the effective brightness of the corresponding wavelength sub-pixel is adjusted by changing the pulse width within each frame. The PWM frequency is set above several kilohertz to avoid flicker perception by the human eye.

[0142] Timing distribution and synchronization: Although the left and right eye images are displayed simultaneously, the system still needs complex timing control to correctly display the stereoscopic content. The video controller splits the input left and right eye frame stream and sends them to the driving circuit of the LED module through a high-speed serial interface. The driving system contains a timing controller that coordinates the scanning of the LEDs in each channel. To simplify the wiring, the screen is usually divided into several scanning blocks that are driven at different times. The controller lights up the LEDs in the order of row and column scanning. It must be ensured that at any time, the six sub-LEDs of the same pixel will not be out of sync due to scanning delay, otherwise it may cause instantaneous color deviation or stereoscopic distortion. To this end, the driving logic strictly synchronizes the power-on sequence and enable time of the left and right eye corresponding channels, and cooperates with the high-speed cache to achieve synchronous refresh of the left and right channels. This high-precision timing distribution circuit ensures that even in fast motion pictures, the left and right eye images are still strictly aligned.

[0143] EMI optimization and power management: Due to the high-speed switching of thousands of LED channels, the driving system may generate significant electromagnetic radiation interference (EMI). To suppress EMI, the driving IC and wiring are optimized during PCB layout: measures such as shortening the wiring length, using differential signals, and adding a shielding ground layer are taken. The driving timing also controls the start of each module to avoid a large number of LEDs being turned on at the same time, which can cause a sudden change in current and thus reduce power noise radiation. The power supply part uses multi-stage filtering and voltage stabilization design to ensure the purity and stability of the LED power supply. In addition, considering that the system has doubled the number of light-emitting units compared to conventional LED display screens, it also focuses on power consumption control. The driving system has an automatic brightness limit (ALM) algorithm built-in: when it detects that a large area of the screen is simultaneously high-brightness in both left and right eyes, it appropriately reduces the overall driving current upper limit to avoid power overload and overheating. Similarly, when switching from full black to full white, soft start is controlled through slope to prevent sudden large current impact. Through these measures, the driving control of the system can meet the requirements of multi-channel accurate output, while ensuring electromagnetic compatibility and energy efficiency, making the stereoscopic display screen run stably and reliably.

[0144] The left and right eye filters are the key optical devices for the spectral stereo separation. In design, they need to transmit three narrow bands of the visible spectrum (corresponding to RGB three primary colors) respectively, while strictly cutting off other bands, to ensure that the left and right eye image signals do not interfere with each other. For this purpose, the filters are composed of multiple layers of dielectric interference film system. According to the principle of interference filtering, by alternately stacking high refractive index (such as TiO2, n≈2.3) and low refractive index (such as SiO2, n≈1.46) dielectric thin films on a glass substrate, a specific center wavelength, high transmission narrow band pass peak, and steep edge cut-off characteristics can be formed. The design team optimizes the calculation based on the film system theory. Each narrow band channel is usually composed of multiple resonant cavity superposition structures with dozens of dielectric films. The increase in the number of resonant cavities greatly improves the selectivity of the filter, making the transmission bandwidth narrow to about 30 nm or even lower, and the band edge transition zone is only a few nanometers, realizing the "well water does not invade river water" of left / right eye corresponding wave band. Taking a typical design as an example, the left eye filter transmits red 629nm / green 532nm / blue 446nm wave band light, and the right eye filter transmits red 615nm / green 518nm / blue 432nm wave band light. The two groups of wave bands are completely staggered in the spectrum and cover the three-color sensitive range of the human eye, so as to ensure the color gamut and realize signal separation. In terms of process preparation, this kind of multi-layer interference filter has very high requirements for film thickness precision. Each layer of film thickness is usually designed according to the quarter wavelength optical thickness, and any thickness error will cause the center wavelength to shift. For example, a 1% thickness deviation can cause the center wavelength to move about 2-3 nm, which in turn weakens the separation degree of left and right eye channels. To ensure that the process tolerance is within a controllable range, high-precision coating technologies such as ion beam sputtering are used in manufacturing, and optical monitoring is used to measure the transmission spectrum in real time to terminate the coating, ensuring that the thickness of each layer falls within the tolerance. When mass production, batch consistency also needs to be considered: by strictly controlling the process parameters of the vacuum coating equipment and the refractive index of each batch of raw materials, the spectral characteristics of different batches of filters are highly reproducible. This is very critical for large-scale applications, so that the spectral responses of the left and right pieces of all glasses are consistent, and individual differences do not affect the 3D effect. In view of the angle offset adaptability of the interference filter, the design is also optimized. When the interference filter is not perpendicular to the incident, the center wavelength of the transmitted light will shift short with the increase of the incident angle. This means that when the audience watches the screen at a large viewing angle, the spectral curve of the left and right eye filters may move, causing the adjacent channels to overlap, causing crosstalk. To reduce this effect, we use a multi-cavity broadband design, making the filter transmission peak flat, and still maintaining high transmission within a certain angle range. Specifically, by introducing multiple small resonant cavities with different centers in the design, the transmission band is widened to slightly larger than the actual LED spectrum width. In this way, even if there is a slight angle red shift / blue shift, the passband can still cover the LED emission peak.In summary, through careful design of the film system and strict manufacturing process, the left and right eye narrow-band filters of the system achieve the quality of narrow-band high transmission, steep cut-off and batch consistency. After cooperating with high-purity multi-wavelength LED light sources, the left and right eye channels obtain very good separation effect, and the audience wearing passive filtering glasses can see clear and realistic stereoscopic images.

[0145] In the product development process, we performed detailed optical simulation analysis on the multi-wavelength LED array to optimize the stereoscopic display effect. The LED emission angle characteristics are the first factor to consider. COB packaged LED chips are usually mounted on a flat surface, and the emitted light passes through the encapsulation interface, which is approximately Lambertian distribution, that is, in the half space, it is oriented to light with cosine. Simulation shows that the typical half-intensity angle of each LED is about 120°. Such a wide emission angle is beneficial to expand the viewing range of the display screen, but at the same time, it is necessary to verify the parallax coincidence of each wavelength light at different angles. After establishing a three-dimensional model of the LED pixel using optical simulation software such as LightTools, we set up a virtual binocular observation model at the sight distance, and by changing the observation angle, we analyze whether the left and right eye pixel parallax is correctly coincided. The results show that within ±20° of the horizontal viewing angle, the corresponding pixels seen by the left and right eyes can be well coincided into a single 3D pixel. However, if the viewing angle is too large, the spectral shift of the filter will cause an increase in a small amount of crosstalk. To this end, we compromise the best viewing range of the screen in the design, and when necessary, we increase the optical isolation between pixels (such as micro-shading) to suppress the crosstalk at an oblique angle. Light intensity distribution and uniformity: Since each pixel contains multiple chips, we simulated the pixel near-field light intensity distribution and the far-field large-area screen brightness uniformity by TracePro. The mixed light package makes the light of each chip in the pixel mix well, and each color sub-pixel can be regarded as the same optical center when observed in the far field. However, it is necessary to ensure that the brightness distribution of the left and right eye images is consistent on a large screen. We perform lighting simulation on the entire LED array, and the results are used to guide the improvement of the driving and scanning method to eliminate possible brightness unevenness. For example, the pixels near the entrance of the driving power supply have a higher temperature rise during long-term operation, and the brightness may be slightly reduced. Therefore, we slightly compensate the pixels in the edge area in the driving control to ensure the smooth and consistent brightness of the entire screen. Wavelength shift and thermal drift compensation: The emission wavelength of LED devices will change slightly with the junction temperature and driving current. In a multi-wavelength system, if this shift is not controlled, it may weaken the spectral splitting effect of the left and right eye filters and increase the ghosting. We added a thermal-optical coupling analysis in the simulation: assuming that the ambient temperature rises or the LED junction temperature rises continuously when the screen is continuously bright, the peak of the blue LED may shift from 446 nm to ~450 nm, close to the edge of the other eye filter channel. For this, we developed a thermal compensation strategy: a temperature sensor is placed on each module to monitor the temperature in real time, and when the threshold is exceeded, the driving system automatically slightly reduces the current or turns on the fan to cool down to control the junction temperature within a safe range. In addition, a certain margin is also reserved in the filter design, so that the passband is slightly wider than the cold-state peak width of the LED, so that even a few nanometers of drift will not cause serious crosstalk. Similarly, for the manufacturing deviation of the wavelength center of different batches of LEDs, we adjust the driving current ratio to correct the white balance-for example, the red light of the left eye of a certain batch is slightly longer, we reduce the red light output of the right eye to rebalance the color. These measures have been verified to be effective in simulation.After optimization by optical simulation, the system successfully controls the parallax to the ideal state, and the left and right eye images are aligned accurately. The crosstalk rate is reduced to a very low level, ensuring the clarity and stability of 3D display. Finally, we also explore multi-view observation using simulation. If it needs to be expanded to naked-eye multi-view 3D display, more wavelength channels can be considered to form multiple groups of light spectrum, thereby realizing image multiplexing of different viewpoints. Simulation shows that each additional pair of three primary colors will reduce the brightness and increase the design complexity. Therefore, the current system has achieved the best balance in binocular stereoscopic display - using the high selectivity of narrow spectrum to realize the parallel display of two channels, and each eye gets what it needs. Based on the optical simulation results, we have made targeted improvements to the hardware design, so that the final physical system has reached the design goals in terms of brightness, color and stereoscopic effect, laying a foundation for further application deployment.

[0146] Based on the above technical advantages, the multi-wavelength COB LED active stereoscopic display system has broad application prospects in many fields: smart city public display: in the construction of smart cities, large-scale stereoscopic public information screens can be deployed to publish three-dimensional real scene navigation, weather warning, cultural propaganda and other information. For example, in city squares or transportation hubs, a stereoscopic LED billboard can be installed, which can be used as a regular display screen during the day and switched to 3D mode to play stereoscopic images at specific times. People can experience realistic stereoscopic effects from designated viewing areas without wearing glasses. In these scenarios, the advantages of high brightness and wide viewing angle of the system are fully utilized: LED active light is not disturbed by ambient light, and the spectrum filtering glasses have the effect of reducing ambient light to improve contrast (even in daylight, the image is still clear). For temporary visitors who do not wear stereoscopic glasses, the display screen can also be switched back to ordinary 2D mode or play pseudo-3D content after binocular fusion processing to cater to all viewers. New generation of 3D cinema: the system is expected to be a new solution for cinema stereoscopic screens, replacing existing polarization or shutter 3D projection technology. Traditional cinema 3D such as IMAX 3D uses polarized light, which requires a metal screen and polarized glasses, or Dolby 3D uses a spectrum filtering wheel, which has problems such as large brightness loss and complex equipment. After introducing the LED 3D screen with active light, left and right eye stereoscopic films can be played directly without the need for projectors and special screens. The light spectrum filtering glasses worn by the audience are still lightweight, but the high brightness of the screen self-emission can significantly improve the brightness of the 3D image. More importantly, the system no longer needs a dual projection or high-speed switching synchronization system, avoiding the image jitter caused by the synchronization of projectors and LCD glasses in traditional shutter 3D.

[0147] The light loss caused by filter absorption in the spectral separation 3D method can reduce the final brightness to only 10-15%, so it has been gradually replaced by other solutions in cinemas. However, the present system greatly improves the light utilization efficiency by directly using narrow-wavelength LED light emission, and can minimize the loss of light energy. Therefore, the LED stereoscopic screen has the potential to realize a 3D viewing experience close to the brightness of 2D projection, and to improve the criticism of the dark picture of previous 3D movies. In addition, since the spectral glasses also selectively filter out ambient light, the visual contrast is actually improved when watching 3D in a bright environment. In addition, the glasses are passive and do not flicker, so the viewing comfort is higher, and unlike shutter glasses, some people do not experience eye fatigue due to frequent opening and closing.

[0148] Cultural and tourism immersive experience: In the field of cultural tourism, the present system can be applied in large-scale immersive digital performances and theme exhibitions. For example, in the holographic theater of a theme park, a large LED stereoscopic screen is combined with stage scenery and actors to present an immersive performance that is both real and illusory. After the audience wears the spectral stereoscopic glasses, the images on the stage seem to be suspended in the air like a solid, blending with the real scene and enhancing the shock of the performance. Due to the high brightness and rich colors of the LED screen, it can be used to project 3D visual effects in outdoor nighttime large-scale light shows, interacting with real elements such as fireworks and water curtains. In museums and science and technology museums, such stereoscopic display can be used for augmented reality (AR) exhibitions: for example, a transparent LED screen behind an exhibit case displays the three-dimensional structure analysis of an artifact, and the audience can see the "floating" structure explanation model through the spectral glasses, which can be compared with the real object to improve the popularization effect. For example, in an interactive game experience hall, the stereoscopic screen is combined with motion capture to realize real-time interaction between the audience and the stereoscopic characters. Compared with traditional flat screens, the present system can bring stronger spatial immersion, and at the same time, due to the lack of complex synchronization like active shutter glasses, it is also convenient to be linked with other audio-visual equipment. These application scenarios fully embody the value of active light-emitting stereoscopic display in the cultural and tourism industry, and with the help of 3D technology, the audience can "experience it firsthand", and the cultural content can be enhanced.

[0149] Intelligent medical stereoscopic display: In the medical field, accurate depth perception is of great significance for surgery and diagnosis. This system can be used for stereoscopic surgical navigation and display: In minimally invasive surgery, surgeons often need to operate through image-guided instruments. If a 3D image of the patient's surgical area is presented on a stereoscopic display screen (combined with endoscopic binocular camera or 3D scanning), the doctor can directly see the stereoscopic relationship of the anatomical structure by wearing light filtering glasses, without being limited to a flat screen. This helps to improve positioning accuracy and shorten surgery time. In orthopedic surgery planning, doctors can also observe the 3D model of the patient's skeleton through stereoscopic display, as if it were directly suspended in front of them, making it easier to develop a surgical plan. In addition, in the field of medical image stereoscopic visualization, the three-dimensional model reconstructed from CT, MRI and other data displayed through this system can help doctors more clearly observe the location and spatial direction of complex lesions. For example, the relationship between brain blood vessels, tumors and surrounding tissues can be displayed stereoscopically before brain surgery, making it easier to plan the approach. Traditional polarization stereoscopic or shutter stereoscopic display has limitations in medical applications, including poor brightness, color restoration, and inconvenience of wearing. This system has accurate color and clear highlights, which is more advantageous in presenting subtle differences in medical images. At the same time, passive light filtering glasses are extremely light and will not burden the operator, and doctors will not experience severe discomfort even after wearing them for a long time. For medical teaching, naked-eye stereoscopic remote consultation can also be used: A large-size stereoscopic screen is installed in the surgical demonstration room, and students can watch the stereoscopic surgical picture in the operating field of the lead surgeon by wearing glasses, and thousands of people can watch at the same time. This will greatly improve the effectiveness of medical teaching and training.

[0150] Intelligent education and engineering design: In the field of education, the introduction of active stereoscopic display can revolutionize classroom demonstration methods. For science and engineering teaching, many complex structures and abstract concepts are easier to understand using 3D visualization. Using this system to build a 3D classroom demonstration platform, teachers can display molecular structures, geometric bodies, and physical scenes as models in a stereoscopic manner in front of the classroom. Students wearing light spectrum glasses can see the models presented in a suspended stereoscopic form, which is more impactful and intuitive than flat diagrams. For example, demonstrating complex molecular crystal structures in chemistry class or observing the anatomical relationship of cells and organs in biology class can greatly enhance understanding. For distance education, stereoscopic display can also be used for 3D distance learning or meetings: The presenter stands in a stereoscopic capture environment, and his image is reproduced in real time through an LED stereoscopic screen in a different location. The audience seems to be face-to-face with the real person, improving the immersion of remote communication. In addition, in the field of engineering and design, when a team reviews a three-dimensional model (such as a building BIM model or a product design prototype), a large-size stereoscopic wall screen is used for display, which is more natural and convenient than each person wearing a VR headset for collaboration, and it also maintains a face-to-face communication environment. Since this system does not have the resolution reduction and severe viewing angle limitations of traditional naked-eye 3D (such as cylindrical lens screens), it is practical and feasible in large classroom and meeting scenarios

[0151] The above description is only the preferred embodiment of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can make equivalent substitutions or changes according to the technical solution and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A stereoscopic display device based on a multi-wavelength COB LED array, characterized in that, The application relates to a wavelength-selective light-emitting display device, which comprises the following parts: a COB substrate for carrying LED chips; an LED chip array arranged on the COB substrate, and the LED chip array comprises at least two groups of LED chips with light-emitting wavelengths of lambda 1 and lambda 2 respectively, wherein the group of LED chips with the first wavelength lambda 1 corresponds to left-eye image display, and the group of LED chips with the second wavelength lambda 2 corresponds to right-eye image display; a light-emitting driving unit for driving the group of LED chips with the wavelength lambda 1 to emit light according to the mapping of left-eye image signals, and driving the group of LED chips with the wavelength lambda 2 to emit light according to the mapping of right-eye image signals; an image processing unit for correcting and processing the light-emitting image; wavelength-selective filter glasses worn on the human body, wherein the left-eye lens of the filter glasses is high in transmittance to the wavelength band lambda 1 and is cut off to the wavelength band lambda 2, and the right-eye lens is high in transmittance to the wavelength band lambda 2 and is cut off to the wavelength band lambda 1, so that the left-eye and right-eye spectrums are separated.

2. The multi-wavelength COB LED array based stereoscopic display device according to claim 1, wherein, The COB substrate is made of aluminum nitride ceramic, a metal copper-clad plate or a glass substrate, the LED chips are directly bonded to the substrate through a flip-chip welding process, and a transparent encapsulating colloid containing scattering particles is coated on the surface to form a light mixing layer.

3. The multi-wavelength COB LED array based stereoscopic display device according to claim 1, wherein, The arrangement mode of the LED chip array is an interlaced grid, an alternate row-column layout or a chessboard layout.

4. The multi-wavelength COB LED array based stereoscopic display device of claim 1, wherein, The light-emitting driving unit adopts a multi-channel constant current source matched with high-frequency PWM dimming, the PWM frequency is greater than 2 kHz, and a temperature sensor is arranged inside to adjust the driving current in real time to compensate for wavelength thermal drift.

5. The multi-wavelength COB LED array based stereoscopic display device of claim 1, wherein, The light-emitting driving unit has a static driving mode and a frame sequence driving mode, the static driving mode is that a plurality of LED chips emit light simultaneously and continuously, and each LED chip continuously displays a respective image in the light-emitting channel, and the frame sequence driving mode is that the LED chip array corresponding to the left-eye image and the LED array corresponding to the right-eye image emit light alternately. 6.The multi-wavelength COB LED array based stereoscopic display apparatus according to claim 1, wherein, The image processing unit comprises a color gamut mapping module, and the left-eye and right-eye images are respectively subjected to metamerism correction, gamma correction and brightness equalization treatment based on the response characteristics of human eye cone cells.

7. The multi-wavelength COB LED array based stereoscopic display apparatus according to claim 1, wherein, The LED chip array contains n groups of different wavelengths λ1, λ2, ..., λ3. n The LED chips are arranged such that the first wavelength λ1 corresponds to the left-eye image display, the second wavelength λ2 corresponds to the right-eye image display, and the remaining λ3-λ... n In the LED chips, one or more of them are combined with LED chips of wavelength λ1 and / or λ2 to emit light synchronously to form a left-eye image or a right-eye image.

8. The multi-wavelength COB LED array based stereoscopic display apparatus according to claim 1, wherein, The LED chip array comprises three groups of LED chips with different wavelengths lambda 1, lambda 2 and lambda 3, the left-eye filter piece of the wavelength-selective filter glasses projects the wavelength band lambda 1+lambda 3 to form a left-eye image, and the right-eye filter piece of the wavelength-selective filter glasses projects the wavelength band lambda 2+lambda 3 to form a left-eye image.

9. The multi-wavelength COB LED array based stereoscopic display apparatus according to claim 1, wherein, The left-eye lens and the right-eye lens of the wavelength-selective filter glasses are both made of a multi-layer dielectric interference film, the thicknesses of the left-eye lens and the right-eye lens are different, and the transmittable spectrums of the red, green and blue three primary colors of the corresponding left-eye lens and right-eye lens are different.

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