The invention provides a virtual reality display device, which comprises at least one display and at least one optical module. The display is adapted to provide an image light beam to a left or righteye of a user. The optical module is arranged on a transmission path of the image beam, and is positioned between the display and the left or right eye of the user. The optical module comprises a first Fresnel lens, wherein the first Fresnel lens comprises a plurality of annular structures surrounding an optical axis thereof, each of the annular structures has an effective refracting surface and anon-optical effective surface positioned between the optical axis and the effective refracting surface, and each effective refracting surface is connected with the corresponding non-optical effectivesurface. An average inclination angle of the first Fresnel lens relative to the optical axis on a plurality of non-optical effective surfaces in the central region is smaller than an average inclination angle of the first Fresnel lens relative to the optical axis on a plurality of non-optical effective surfaces in the edge region.

Virtual reality display device

The invention relates to a computer vision and an image processing technology. In order to propose a universal molar grain removing method, the molar grain removing method based on a plurality of pictures of the invention comprises the following steps: step 1, aligning images: converting all images taken on a screen to the same view angle; step 2, selecting a region without or with a slight molarripple to generate a corresponding mask {M1, M2,..., MM}, i.e., the pixel value of the selected region in the image is 1, the pixel value of the other region is 0, and the selected region should haveat least a few pixels overlapped so as to synthesize the whole image in the next step; step 3, image fusion: fusing the respective image regions selected in the previous step into a map IC, the pixelsof the overlapping portion being averaged to mitigate the boundary effect(shown in the specification) where sigma represents the image fusion operation. The invention is mainly applied to image processing occasions.

Moire removing method based on multiple graphs

A display device and a display method are provided. The display device includes a display assembly and a refractive component. The display assembly includes a display region and is configured to emit imaging light from the display region to default direction. The refractive component is disposed on a display side of the display assembly and configured to diverge or converge at least partial imaging light. The comfort degree of the head mounted virtual reality device is improved, or a head-mounted display device with anti peeping function is provided.

Display device and display method

The invention discloses a verification information display method and a mobile terminal. The method comprises the following steps that: determining target verification information; generating a targetverification image, wherein the target verification image is an image generated by adding shading to a target area which contains the target verification information; and displaying the target verification image and a first image, wherein the first image is an image which is used for covering the target verification image to enable the target verification information in the target verification image to be visible. By use of the embodiment of the invention, the shading is added to the target verification information to generate the target verification image which carries invisible target verification information, and the target verification image and the pre-constructed first image are displayed to users together. Since the first image serves as a role of ''decryption card'', the users cancover the target verification image with the first image to enable the target verification information to be visible.

Verification information display method and mobile terminal

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.

Method for decreasing Moire fringes in glasses-free 3D directional backlight system

The invention discloses a Moire fringe matrix-based confidential information display method, and aims at realizing information display through superposition of a first grating matrix and a second grating matrix. The method specifically comprises the following steps of: randomly generating the first grating matrix; calculating the second grating matrix according to the generated first grating matrix and to-be-displayed information, wherein each group of gratings, at corresponding positions, of the first and second grating matrixes can be superposed to generate dark fringes or bright fringes, namely, generate required dark spots or bright spots; and superposing a generated pattern of the first grating matrix on the second grating matrix to generate a Moire fringe matrix, namely, forming a matrix consisting of the dark spots and the bright spots, so as to obtain the to-be-displayed information. According to the method disclosed by the invention, the information to be confidential is hidden in Moire fringe matrixes, so that the confidentiality is favorable, and the important information can be effectively protected from being automatically acquired by machines; and only one grating matrix is directly displayed in a screen, and the final to-be-displayed information is not included, so that the grating cannot be decoded when being intercepted by lawbreakers.

Moire fringe-based confidential information display method

The invention provides a naked-eye 3D Moire fringe eliminating device and a use method thereof. The device comprises a backlight source, a Fresnel lens array, an optical film layer, a liquid crystal panel and virtual receivers. After light which is emitted from a first light emitting unit and a second light emitting unit is refracted by the Fresnel lens array, focusing light with pseudo-periodicity is formed on an emergence plane of the Fresnel lens array. The focusing light with pseudo-periodicity arrives at the optical film layer. Distribution of light in a local area in which the optical film layer exists is changed, and original pseudo-periodicity is lost. But propagation direction of the light is not changed. Therefore after the optical film layer, the light is changed to the focusing light without pseudo-periodicity. The focusing light without pseudo-periodicity arrives at a sub-pixel grating of the liquid crystal panel and is divided into different colors. A first virtual receiver and a second virtual receiver collects light, and hereon the Moire fringe has been weakened.

Li Kunyang

Papers

Method for decreasing Moire fringes in glasses-free 3D directional backlight system

Moire fringe-based confidential information display method

Naked-eye 3D Moire fringe eliminating device and use method thereof