CN-121978844-A - Multimode display system and display method based on variable-focus microlens array

CN121978844ACN 121978844 ACN121978844 ACN 121978844ACN-121978844-A

Abstract

The invention relates to a multimode display system and a display method based on a variable-focus microlens array, and belongs to the technical field of display. The micro-lens array imaging module is used for carrying out imaging output of real image-text information and virtual image-text information according to the modulated parallel light beams and focal length configuration, and is used for controlling working states of the incident light modulation module and the micro-lens array imaging module according to preset time sequences to alternately realize real image imaging and virtual image imaging, wherein the incident light modulation module comprises a light source, a collimating lens and an electric control mask plate, the light source and the electric control mask plate are respectively arranged on two sides of the collimating lens, the micro-lens array imaging module comprises a composite micro-image-text mask plate, a spacing layer and a focusing liquid crystal micro-lens array, and the composite micro-image-text mask plate and the focusing liquid crystal micro-lens array are arranged on two sides of the spacing layer. The invention improves the stability and reliability of the display system.

Inventors

Zhang Shenkai
SUN HAORAN
LU YUXUAN
TANG JIAWEI
WANG WEIYE
LUO YUECHUAN
HUANG WENBIN
LI NIANQIANG

Assignees

苏州大学

Dates

Publication Date: 20260505
Application Date: 20260409

Claims (10)

1. A multi-mode display system based on a variable focus microlens array, comprising: the incident light modulation module is used for emitting a time sequence-controllable modulated parallel light beam; the micro-lens array imaging module is used for carrying out imaging output on real image-text information and virtual image-text information according to the modulated parallel light beams and focal length configuration; the control module is used for controlling the working states of the incident light modulation module and the micro-lens array imaging module according to a preset time sequence, and alternately realizing real image imaging and virtual image imaging; The incident light modulation module comprises a light source, a collimating lens and an electric control mask plate, wherein the light source and the electric control mask plate are respectively arranged at two sides of the collimating lens; The micro-lens array imaging module comprises a composite micro-image-text mask plate, a spacing layer and a liquid crystal micro-lens array with adjustable focus, wherein the composite micro-image-text mask plate and the liquid crystal micro-lens array with adjustable focus are arranged on two sides of the spacing layer, the electric control mask plate is arranged on one side, far away from the spacing layer, of the composite micro-image-text mask plate, and the control module is connected with the electric control mask plate and the liquid crystal micro-lens array with adjustable focus.
2. The multi-mode display system based on a variable focus microlens array of claim 1, wherein the composite microimage reticle comprises real image and virtual image subunits, wherein the real image and virtual image subunits are alternately arranged.
3. A multi-mode display system based on a variable focus microlens array according to claim 2, wherein the real image-text sub-unit and the virtual image-text sub-unit are aligned with the corresponding imaging units of the variable focus liquid crystal microlens array with a precision of the variable focus liquid crystal microlens array period of less than 1/6 in the X-direction and the Y-direction.
4. The multi-mode display system of claim 2, wherein the real image-text sub-units are arranged in odd columns and the virtual image-text sub-units are arranged in even columns.
5. The multi-mode display system based on the variable-focus microlens array according to claim 1, wherein the distance between the light source and the collimating lens is the same as the focal length of the collimating lens, and the breadth of the electrically controlled mask is smaller than the aperture size of the collimating lens.
6. A variable focus microlens array based multi-mode display system according to claim 1, wherein the format of the microlens array imaging module is smaller than the aperture size of the collimating lens.
7. The multi-mode display system based on the variable focus microlens array according to claim 1, wherein the variable focus liquid crystal microlens array comprises a plurality of unit lenses, the electronic control mask comprises a plurality of sub-units, and the number of the unit lenses is the same as the number of the sub-units.
8. A multi-mode display method based on a variable-focus microlens array, implemented by the multi-mode display system based on a variable-focus microlens array according to any one of claims 1 to 7, comprising: The method comprises the steps of (1) incidence of divergent light beams emitted by a light source into a collimating lens to generate modulated parallel light beams with controllable time sequence, wherein the modulated parallel light beams are incident to the surface of an electric control mask plate; According to the time sequence signal, switching the light transmission shielding state of the electric control mask plate and the focal length working state of the adjustable focal length liquid crystal micro lens array; The modulated parallel light beam is incident to the electric control mask plate which is switched currently and finished, and the transmitted light corresponding to the light transmission area is obtained through screening, and the transmitted light is sequentially irradiated to the composite micro image-text mask plate, the spacing layer and the adjustable-focus liquid crystal micro lens array which is switched currently and finished to generate image-text information imaging, wherein the image-text information is real image-text information or virtual image-text information; And controlling the working states of an incident light modulation module and a micro-lens array imaging module according to a preset time sequence to alternately realize real image imaging and virtual image imaging, wherein the incident light modulation module comprises the light source, the collimating lens and the electric control mask, and the micro-lens array imaging module comprises the composite micro-image-text mask, the spacing layer and the adjustable-focus liquid crystal micro-lens array.
9. The multi-mode display method based on the variable-focus microlens array according to claim 8, wherein the switching of the light-transmitting shielding state of the electrically controlled mask plate and the focal length working state of the variable-focus liquid crystal microlens array according to the timing signal comprises: when the time sequence signal is a real image imaging time sequence signal, the odd-numbered row subunits of the electric control mask plate transmit light, and the adjustable-focus liquid crystal micro lens array is switched to a real image focal length mode; when the timing signal is a virtual image imaging timing signal, even-numbered row subunits of the electric control mask plate transmit light, and the adjustable-focus liquid crystal micro lens array is switched to a virtual image focal length mode.
10. The multi-mode display method based on the variable-focus liquid crystal micro lens array according to claim 9, wherein in the real image focal length mode, a target focal length value of the variable-focus liquid crystal micro lens array is 3 mm-3.75 mm, and in the virtual image focal length mode, the target focal length value of the variable-focus liquid crystal micro lens array is 3.35 mm-4 mm.

Description

Multimode display system and display method based on variable-focus microlens array Technical Field The invention relates to the technical field of display, in particular to a multi-mode display system and a display method based on a variable-focus micro lens array. Background In the scenes of museums, commodity display, scientific and technical exhibition and the like, the showcase is a core carrier for displaying real objects. In order to improve information transmission efficiency, a display screen or a projection device is usually arranged near a showcase in the prior art to display auxiliary information such as characters and images related to the showpiece, so that a display mode combining the showpiece with the auxiliary information is formed. At present, the existing virtual-real combined projection technology of showcase scenes is phantom imaging projection, projection equipment or a display screen is generally adopted, auxiliary information is projected or displayed on fixed planes such as the bottom surface of the showcase and a background plate, and display contents mainly comprise two-dimensional images or simple two-dimensional superposition, so that space layering is lacked. Part of the prior art simulates three-dimensional depth in a software mode, but does not realize real optical imaging, lacks parallax information caused by visual angle change, and is difficult to form real space position sense. In addition, when multi-level information is displayed, the existing phantom imaging scheme needs to rely on multiple display planes or multiple sets of projection equipment, so that the system is complex in structure, low in integration level, low in brightness utilization rate, fixed in virtual image depth and the like, and the phantom imaging scheme is difficult to stably apply in a complex showcase environment. In order to overcome the problems, three-dimensional display technology with spatial depth imaging capability is gradually applied to showcase scenes. The integrated imaging 3D projection technology is used as a true three-dimensional light field display technology, and is characterized in that each unit of the micro-lens array accurately captures sub-image information of a corresponding micro-image array, and 3D projection effect is achieved through optical splicing. However, the existing integrated imaging 3D projection technology for showcase scenes still has a plurality of technical problems to be solved urgently, specifically as follows: First, the imaging mode is single and switching is difficult. The existing micro lens array is limited by the fixed relation between the focal length and the object distance, can not realize the display of a real image and a virtual image at the same time, and can only work in a real image or virtual image mode singly. Although the prior art CN110737104a adopts a multi-focal length design, its imaging is limited to the real image area and the imaging mode is fixed. In order to break through the limitation of a single central depth plane, the vibration type micro lens array can work in a real image display mode and a virtual image display mode respectively by changing the object distance, so that two central depth planes at different positions are formed in space, and finally the expansion of the 3D display depth range is realized. However, the scheme relies on the micro-lens array vibration technology, and requires synchronous vibration of the micro-image array and the micro-lens array, has high requirements on mechanical precision, has the problems of high implementation difficulty, high manufacturing cost, poor system stability and the like, cannot realize flexible switching of imaging modes, and has unsatisfactory depth reconstruction effect of 3D scenes. Secondly, the matching property of the image-text content and the imaging mode is poor. The 3D display image-text content corresponds to the imaging mode one by one, and problems such as light crosstalk, imaging distortion and the like are easy to occur when the imaging condition is changed. The existing display screen dynamic refreshing scheme is limited by pixel characteristics and optical matching, and the 3D imaging resolution and the fineness are insufficient. Thirdly, the information display level is single. The showcase needs to realize the information display bound with the showcase space and the information display facing the observer simultaneously or in a switching way, and the prior art is difficult to realize the function, so that the information transmission efficiency is influenced. In conclusion, the existing projection technology for showcases has obvious defects, and cannot meet the virtual-real combined 3D display requirements of multi-level, high-precision and flexible switching. Disclosure of Invention Therefore, the invention aims to overcome the defects of single imaging mode, difficult switching, poor matching between image-text content and imaging mode, single informati