High-resolution high-brightness naked eye light field 3D display screen

Abstract

The invention provides a high-resolution high-brightness naked eye light field 3D display screen which is composed of a micro display screen array, an optical barrier array, a projection lens array, a collimating lens array and a micro lens array. A micro-image array displayed on the micro-display screen array is optically amplified by the projection lens array, and an amplified seamlessly spliced micro-image array is formed in front of the collimating lens array. Light beams of the seamless splicing micro-image array are collimated by the collimating lens array, and emergent light beams of the seamless splicing micro-image array are collimated light beams carrying micro-image array information. The collimated light beam is modulated by the microlens array, and a 3D image is reconstructed in space. The pixel density of the micro display screen is high, the seamless splicing micro image array formed after projection amplification has high pixel density, the voxel size of the 3D image accurately reconstructed by the collimated light beam is small, and the 3D image has high resolution. The brightness of the micro display screen is high, the light transmittance of the projection lens array, the light transmittance of the collimating lens array and the light transmittance of the micro lens array are high, the luminous flux of the micro display screen array is fully utilized, and a reconstructed 3D image has high brightness.

Description

1. Technical Field

[0001] The present invention relates to the field of display technology, and in particular to a high-resolution and high-brightness naked-eye light field 3D display screen. 2. Background Technology

[0002] Glasses-free light-field 3D displays can display images with a sense of depth and accurately reproduce the occlusion relationships between objects, conforming to the human eye's stereoscopic vision characteristics. They offer advantages such as full-color display, naked-eye viewing, and zero stereoscopic fatigue. Resolution and brightness are key performance parameters for glasses-free light-field 3D displays. High resolution and high brightness provide viewers with a comfortable, bright, and realistic viewing experience. However, most existing glasses-free light-field 3D displays use displays such as liquid crystal or organic light-emitting diodes (OLEDs). These displays inherently have low pixel density and brightness, resulting in low 3D image resolution and brightness. Furthermore, the subpixels in these displays have large beam divergence angles, making it difficult to accurately reconstruct 3D images. The resulting large voxel size further reduces 3D image resolution. Microdisplays, such as micro-LEDs and micro-OLEDs, offer high pixel density and high brightness, but their display areas are small and have borders around them, making them difficult to directly splice for glasses-free light-field 3D displays. Therefore, there is an urgent need for high-resolution, high-brightness glasses-free light-field 3D displays that meet viewers' viewing needs. 3. Summary of the Invention

[0003] The present invention proposes a high-resolution and high-brightness naked-eye light field 3D display screen, which is composed of a micro display screen array, an optical barrier array, a projection lens array, a collimating lens array and a micro lens array.

[0004] The micro display screen array is used to display a micro image array.

[0005] The optical barrier array is used to limit the emission angle of the light beam emitted by the micro display screen array, so that the light beam emitted by the micro display screen array can only enter the corresponding projection lens but cannot enter the adjacent projection lens.

[0006] The projection lens array is used to optically magnify the micro-image array displayed on the micro-display screen array to form an amplified seamless micro-image array in front of the collimating lens array.

[0007] The collimating lens array is used to modulate the light beam forming the seamlessly spliced ​​micro-image array into a collimated light beam.

[0008] The microlens array is used to precisely modulate the collimated light beam to reconstruct a 3D image in space.

[0009] Furthermore, the micro display array comprises a high-pixel-density and high-brightness micro display array, and the array is in a two-dimensional layout in the horizontal and vertical directions. The micro display can be a micro-LED micro display, a micro-OLED micro display, or the like, and its sub-pixel arrangement can be any of RGB, RGGB, RGBW, Pentile, Delta, or the like.

[0010] Furthermore, the projection lens array has high light transmittance and is located above the microdisplay array. The array is arranged in a two-dimensional configuration in the horizontal and vertical directions, with its optical axis perpendicular to the plane of the microdisplay array. The surface shape can be a free-form surface, an aspherical surface, a spherical surface, or a combination thereof. The focal length f1 of the projection lens array and its distance g1 to the microdisplay array satisfy the following conditions:

[0011] f1<g1<2f1 (1)

[0012] Furthermore, the optical magnification M of the seamlessly spliced ​​micro-image array relative to the micro-image array displayed on the micro-display screen array is expressed as:

[0013]

[0014] Furthermore, the collimating lens array has high light transmittance and is located above the projection lens array. Its array form is a two-dimensional layout in the horizontal and vertical directions, with its optical axis perpendicular to the plane of the micro-display array. Its focal point coincides with the optical center of the projection lens array. Its surface shape can be a free-form surface, an aspheric surface, a spherical surface, or a combination thereof. The focal length f2 of the collimating lens array and its distance g2 from the projection lens array satisfy the following:

[0015]

[0016] Furthermore, the microlens array, which has high light transmittance and is located above the collimating lens array, is a combination of a one-dimensional cylindrical lens array and a two-dimensional microlens array, with its optical axis perpendicular to the plane of the microdisplay array. The microlens array is tilted relative to the rectangular plane of the collimating lens array to reduce moiré patterns and further improve 3D image resolution. The tilt angle θ ranges from 0° to 45°.

[0017] After the micro-image array displayed on the micro-display screen array is optically magnified by the projection lens array, an amplified seamless micro-image array is formed in front of the collimating lens array. After the light beam forming the seamless micro-image array is collimated by the collimating lens array, the outgoing light beam is a collimated light beam carrying the micro-image array information. After the collimated light beam is modulated by the micro-lens array, a 3D image is reconstructed in space. The pixel density of the micro-display screen is high, and the seamless micro-image array formed after projection magnification has a high pixel density. The voxel size of the 3D image accurately reconstructed by the collimated light beam is small, and the 3D image has high resolution. The micro-display screen has high brightness, and the projection lens array, collimating lens array, and micro-lens array have high light transmittance, fully utilizing the luminous flux of the micro-display screen array, and the reconstructed 3D image has high brightness. IV. Description of the Figures

[0018] Attachment Figure 1 A schematic structural diagram of a high-resolution and high-brightness naked-eye light field 3D display screen provided by one embodiment of the present invention.

[0019] Attachment Figure 2 A top view of a one-dimensional cylindrical lens array provided by an embodiment of the present invention, tilted relative to the rectangular plane where the collimating lens array is located.

[0020] The diagrams in the above drawings are numeraled as follows:

[0021] 1. Microdisplay array, 2. Non-display area between microdisplay arrays, 3. Light beam containing microimage array information emitted by the microdisplay array, 4. Optical barrier array, 5. Projection lens array, 6. Light beam forming an enlarged seamless microimage array, 7. Collimating lens array, 8. Collimated light beam, 9. Microlens array, 10. Reconstructed 3D image, 11. One-dimensional cylindrical lens array, 12. Rectangular plane where the collimating lens array is located.

[0022] It should be understood that the above drawings are merely schematic and not drawn to scale. V. Specific Implementation Methods

[0023] To facilitate understanding of this application, the following detailed description of a typical embodiment of a high-resolution, high-brightness, glasses-free light-field 3D display screen will further describe the present invention. However, this application can be implemented in many different forms and is not limited to the embodiment described herein. Non-essential improvements and adjustments made by persons skilled in the art based on the above disclosure remain within the scope of protection of this invention.

[0024] Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

[0025] The following is a detailed description of a high-resolution and high-brightness naked-eye light field 3D display screen proposed in this application in combination with an embodiment of the present application and the accompanying drawings.

[0026] In one embodiment, the present invention provides a high-resolution and high-brightness naked-eye light field 3D display screen, as shown in the attached Figure 1 As shown, the device consists of a micro display screen array, an optical barrier array, a projection lens array, a collimating lens array and a micro lens array.

[0027] The micro display array is used to display a micro image array. The micro display array is composed of 8×8 Micro-LED micro display arrays, and the array form is a two-dimensional layout in the horizontal and vertical directions. The size of a single Micro-LED micro display is 0.26 inches, the resolution is 640×360 pixels, the pixel density is as high as 2824PPI, and the sub-pixel arrangement is RGGB arrangement. The average brightness L of the Micro-LED micro display display It is 15000nit / s, which is much higher than the brightness of displays such as LCD or OLED (for example, the typical brightness of iPhone 16Pro screen is 1000nit / s).

[0028] The optical barrier array consists of an 8×8 columnar grid structure array in a two-dimensional horizontal and vertical layout. The grid structure is 4.8mm tall and made of black resin with low reflectivity. It is used to limit wide-angle light from the Micro-LED display and prevent crosstalk from entering adjacent projection lenses. The optical barrier array has an attenuation rate β of 20% on the luminous flux of the Micro-LED display array.

[0029] The projection lens array consists of an 8×8 projection lens array in a two-dimensional horizontal and vertical layout. Its transmittance η1 is 90%. It is located at a distance g1 = 4.8 mm above the microdisplay array, has a focal length f1 = 4 mm, and its optical axis is perpendicular to the plane of the microdisplay array. Its surface is aspherical, providing excellent optical magnification. The microimage array displayed on the microdisplay is optically magnified by the projection lens array to produce a magnified seamless microimage array. The seamless microimage array has an optical magnification ratio M = 5 relative to the microimage array displayed on the microdisplay array.

[0030] The collimating lens array is composed of 8×8 rectangular collimating lens arrays, and its array form is a two-dimensional layout in the horizontal and vertical directions. Its transmittance η2 is 90%. It is located above the projection lens array at g2=24mm, its focal length f2=24mm, its optical axis is perpendicular to the plane where the micro display screen array is located, its focus coincides with the optical center of the projection lens array, and its surface shape is a free-form surface shape, which has a good light beam collimation effect.

[0031] The microlens array is a one-dimensional cylindrical lens array with a transmittance η3 of 90%, a pitch of 0.4316mm, a focal length of 0.6427mm, and an aspheric surface. The one-dimensional cylindrical lens array is tilted relative to the rectangular plane where the collimating lens array is located to reduce moiré patterns and further improve the 3D image resolution. The tilt angle θ is 14.036°. Figure 2 shown.

[0032] In one embodiment, an 8×8 Micro-LED micro-display array displays a micro-image array. After being constrained by the optical barrier array, the light beam from the micro-display array enters the corresponding projection lens array above it. After being modulated by the projection lens array, the light beam forms a 5x optically magnified seamless micro-image array in front of the collimating lens array. The size of the seamless micro-image array is 10.4 inches, the resolution is 5120×2880 pixels, and the pixel density is 565PPI. The pixel density is higher than the pixel density of conventional LCD or OLED displays (such as the iPhone 16Pro pixel density of 460PPI). After the light beam of the seamless micro-image array is modulated by the collimating lens, the outgoing light beam is a collimated light beam. After the collimated light beam is precisely modulated by the tilted one-dimensional cylindrical lens array, a 3D image is reconstructed in space. The voxel size of the 3D image is small, and the 3D image has a very high resolution.

[0033] In one embodiment, after the average brightness of the Micro-LED display screen is attenuated by the optical barrier array, projection lens array, collimating lens array and one-dimensional cylindrical lens array, the reconstructed 3D image average brightness L 3D satisfy:

[0034]

[0035] The average brightness of the reconstructed 3D image is approximately 1750nit / s, which is much higher than the brightness of existing naked-eye light field 3D displays based on LCD or OLED displays (for example, the typical brightness of the iPhone 16Pro screen is 1000nit / s, and the brightness of the reconstructed 3D image is less than 900nit / s).

Claims

1. A high-resolution and high-brightness naked-eye light field 3D display, characterized in that: The 3D display screen is composed of a micro display screen array, an optical barrier array, a projection lens array, a collimating lens array and a micro lens array; the micro display screen array is used to display a micro image array; The optical barrier array is used to limit the emission angle of the light beam emitted by the micro display screen array; the projection lens array is used to optically amplify the micro image array displayed on the micro display screen to form an amplified seamless micro image array; the collimating lens array is used to modulate the light beam forming the seamless micro image array into a collimated light beam; the micro lens array is used to precisely modulate the collimated light beam to accurately reconstruct a 3D image in space.

2. A high-resolution, high-brightness, naked-eye light field 3D display according to claim 1, characterized in that: The micro display screen array comprises a micro display screen array; the optical axis of the projection lens array is perpendicular to the plane where the micro display screen array is located; the distance between the projection lens array and the micro display screen array is greater than one times the focal length of the projection lens and less than two times the focal length of the projection lens; the collimating lens array is located above the projection lens array, with its optical axis perpendicular to the plane where the micro display screen array is located and its focal point coincident with the optical center of the projection lens array; the micro lens array has precise light modulation capabilities and is tilted relative to the rectangular plane where the collimating lens array is located.

3. The high-resolution and high-brightness naked-eye light field 3D display according to claim 1, characterized in that: The array forms of the micro display screen array, projection lens array, and collimating lens array are all two-dimensional layouts in the horizontal and vertical directions. The array form of the micro lens array is one of a one-dimensional cylindrical lens array and a two-dimensional micro lens array. The micro lens array is tilted relative to the rectangular plane where the collimating lens array is located.

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