A method for weakening moiré fringes in a naked-eye 3D directional backlight system

A directional backlight and moiré fringe technology, applied in optics, optical components, instruments, etc., can solve problems such as unfavorable naked-eye 3D commercial applications, achieve the effect of weakening moiré fringes and improving quality

Active Publication Date: 2019-02-05
SYSU CMU SHUNDE INT JOINT RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in some naked-eye 3D display systems, the structure of the Fresnel lens group is an important factor for realizing naked-eye 3D, and its periodic structure cannot be changed, and the use of non-periodically arranged LCD screens, which are rare in the market, is not conducive to Commercial applications of glasses-free 3D

Method used

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  • A method for weakening moiré fringes in a naked-eye 3D directional backlight system
  • A method for weakening moiré fringes in a naked-eye 3D directional backlight system
  • A method for weakening moiré fringes in a naked-eye 3D directional backlight system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] figure 1 It is a schematic diagram of the naked-eye 3D directional backlight system, including a backlight source 10, a Fresnel lens group 11, an LCD liquid crystal screen 12 (periodically blocking the grating), and a virtual receiver 13 (simulating the viewing area of ​​human eyes), which requires the use of Fresnel The combination of lens group and LCD liquid crystal screen can realize 3D display effect. The directional backlight is to select the arrangement of turning on and off of the backlight to switch the viewing area of ​​the naked-eye 3D display. For the sake of simulation simplicity, choose to turn on the two backlights facing the middle of the Fresnel lens group.

[0028] a kind of by Figure 2-3 The given analysis example of moiré fringe in naked-eye 3D directional backlight system mainly includes the following principles and methods:

[0029] 1. The grating has a typical periodic structure. Two overlapping periodic gratings can present typical moiré frin...

Embodiment 2

[0045] Such as Figure 4 As shown, this embodiment provides a method for weakening moiré fringes in a naked-eye 3D directional backlight system:

[0046] 1. According to Figure 4 Image for simulation model, image description:

[0047] (1) No. 20 is a controllable switch backlight light source, and the backlight is a straight plane for the convenience of fitting;

[0048] (2) No. 21 is a Fresnel lens group of equal height in a simple simulation 3D display system, and the Fresnel lens group of the polarizing device has a zigzag structure of equal height. Its film thickness is only 0.15mm, so the absorption loss due to the lens is negligible. Its focal length is 123.4cm, the refractive index of the substrate layer is 1.5, and the refractive index of the lens layer is 1.561;

[0049] (3) No. 22 is a sub-grating in which the three primary colors of the LCD screen do not overlap each other, and statistics are made on the moiré fringe distribution of the light hitting the plane;...

Embodiment 3

[0059] Such as Figure 5 As shown, this embodiment provides a method for weakening moiré fringes in a naked-eye 3D directional backlight system:

[0060] 1. According to Figure 5 Image of the model for simulation, image description:

[0061] (1) No. 30 is a controllable switch backlight light source. For the convenience of the experiment, two backlight light sources facing the Fresnel lens can be turned on;

[0062] (2) Number 31 is a Fresnel lens group of equal height in a simple analog 3D display system, and the Fresnel lens group of the polarizing device has a zigzag structure of equal height. Its film thickness is only 0.15mm, so the absorption loss due to the lens is negligible. Its focal length is 123.4mm, the refractive index of the substrate layer is 1.5, and the refractive index of the lens layer is 1.561;

[0063] (3) No. 32 is an LCD liquid crystal screen with low scattering rate and high permeability;

[0064] (4) No. 33 is a virtual light source receiver, wh...

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Abstract

The invention provides a method for decreasing Moire fringes in a glasses-free 3D directional backlight system. The method comprises: calculating Moire fringes generated on an LCD (liquid crystal display) screen when a Fresnel lens set and the LCD screen are under different angles, distances and cycle ratios, and drawing a graph; finding Fresnel lens set and LCD screen distance and angle optimal values from a visual contrast distribution graph for Moire fringes generated by Fresnel lens set and the LCD screen periodical information in the glasses-free 3D directional backlight system; constructing the 3D directional backlight system according to the found Fresnel lens set and LCD screen distance and angle optimal values. The method can decease Moire fringes without affecting the visual enjoinment from the glasses-free 3D system, and the quality of visual sensory views can be improved greatly.

Description

technical field [0001] The invention relates to the field of naked-eye 3D display systems, and more particularly, relates to a method for weakening moiré fringes in a naked-eye 3D directional backlight system. Background technique [0002] Moiré fringes are usually produced when two or more periodic structures are superimposed, which is an optical geometric effect of periodic structures. The moire effect will cause disturbing stripes to appear on the original image, interfere with the display of the image, and cause the image to be distorted in graphics and color. [0003] In the naked-eye 3D system, the main components of the model include backlight, Fresnel lens group, LCD liquid crystal screen, and viewpoint. Different pictures projected by different backlight combinations reach different positions in the viewing area to achieve the naked-eye 3D effect. Among them, the superposition of the approximately periodically arranged Fresnel lens group and the LCD screen with per...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B27/22G02B27/60
CPCG02B27/60G02B30/27
Inventor 周建英李焜阳周延桂伍代轩马雪岩咸昱桥范杭王嘉辉
Owner SYSU CMU SHUNDE INT JOINT RES INST
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