A backlight device includes LEDs, a light guide plate, an LED board, and a light blocking portion. The light guide plate includes a side surface configured as a light entrance surface through which light from the LEDs enters and a plate surface configured as a light exit surface through which light exits the light guide plate. The LED board on which the LEDs are mounted and at least a portion of which is a light guide plate overlapping portion is on a light exit surface side. The light guide plate overlapping portion overlaps a light entering edge portion that is an edge portion of the light guide plate close to the light entrance surface. The light blocking portion is at the light guide plate overlapping portion of the LED board and between the light guide plate overlapping portion and the light entering edge portion of the light guide plate.

Lighting device and display device

There is disclosed a transparent light field display device including a transparent substrate, an array of light-emitting picture elements formed on the transparent substrate, and a sparse microlens array formed over the array of light-emitting picture elements. The sparse microlens array includes a plurality of lens elements with spaces between adjacent lens elements. When the transparent light field display device is disposed with the sparse microlens array proximate a viewer's eye, the spaces between adjacent lens elements allow the viewer to see objects beyond the transparent light field display device.

Augmented reality display system

There is provided a lens array and an lens array capable of suitably preventing irregular brightness without reducing resolution. A microlens array 20 of a screen 2 includes upper-level microlenses 21H and lower-level microlenses 21L which are formed on the incidence surface of the screen 2, which have the same effective diameter, and which have a structure that generates an optical path length difference Δ in transmission light. By disposing the upper-level microlenses 21H and the lower-level microlenses 21L at an interval based on the effective diameter, the basic periodic structure of a lens period PL is formed. Further, the upper-level microlenses 21H and the lower-level microlenses 21L form a basic block comprising a combination of the lenses having a structure that generates the optical path length difference. A concave-and-convex period PC based on the basic block is an integer multiple of the lens period PL.

Lens array and image projection device

A microlens array diffuser operable to generate a substantially diffuse illumination includes an array of microlenses, wherein each microlens has a respective periodicity-influencing characteristic and a respective surface profile. The array of microlenses includes at least two microlenses having respective periodicity-influencing characteristics that differ from one another and having respective surface profiles that differ from one another. Each surface profile is configured to generate a substantially equal field of illumination. The microlens array diffuser can be integrated as part of an illuminator operable to generate substantially diffuse illumination.

Microlens array diffusers

The invention provides a projection screen and a projection system, and belongs to the field of projection display. The projection screen comprises a columnar micro-lens layer, a first base material layer and a reflection microstructure layer which are arranged in the thickness direction of the projection screen, and the columnar micro-lens layer comprises a columnar micro-lens layer I and a columnar micro-lens layer II and is arranged on one side of the first base material layer; the columnar micro-lens layer I comprises a plurality of vertical columnar micro-lenses, and the height-width ratio of the vertical columnar micro-lenses arranged in the direction from the transverse direction of the projection screen to the two ends is gradually reduced by taking the central axis as a reference;the columnar micro-lens layer II comprises a plurality of transverse columnar micro-lenses, and the height-width ratio of the transverse columnar micro-lenses is gradually reduced from one side to the other side in the vertical direction of the projection screen; the reflection microstructure layer is provided with a plurality of microstructures, and the microstructures are arc-shaped or parabola-shaped or oval or linear. The projection system comprises a projector and the projection screen. According to the invention, the brightness uniformity of the projection screen and the projection system is improved.

Projection screen and projection system

The present invention provides a diffuser plate and a method for producing a diffuser plate that can improve variations in luminance of transmitted light or reflected light in a simple structure and that enable easy design and production. The diffuser plate according to the present invention is a diffuser plate where a plurality of microlenses are placed on a principal surface, wherein a phase difference generation part is inserted between the plurality of microlenses and the principal surface, the plurality of microlenses have two or more types of lens shapes, and the number of microlenses having the two or more types of lens shapes is determined so that a quantity ratio of the two or more types of lens shapes is a specific value, each of the lens shape types is selected corresponding to each of coordinates on the principal surface in which centers of undersurfaces of the plurality of microlenses are placed, and an angle range in which the diffuse light intensity is substantially uniform is in a range of +10% to −10% of a desired angle range.

Diffuser plate and method for producing diffuser plate

The present invention provides an easily producible diffusing plate having a simple design, and capable of improving the brightness unevenness of transmitted light or reflected light by using a simple configuration, and a method for producing the diffusing plate. This diffusing plate has a plurality of microlenses arranged on the principal surface thereof, and is characterized in that: a phase-difference generation unit is inserted between the principal surface and the plurality of microlenses; the plurality of microlenses have two or more types of lens shapes; the number of microlenses having the two or more types of lens shapes is determined in a manner such that the quantitative ratio of the two or more types of lens shapes is a specific value; the lens shape type is selected according to the coordinates on the principal surface on which the floor surface centers of the plurality of microlenses are positioned; and the angular range in which the diffused light intensity is substantially constant is within a range extending from -10% from a desired angular range to +10% therefrom.

Diffusing plate and method for producing diffusing plate

The present invention provides a method for designing a light diffusion pattern with which a light diffusion pattern to exhibit desired light diffusion properties can be designed depending on a few systematic procedures. The method includes a lens data preparation step of preparing lens data having desired light diffusion properties, a placement step of placing a plurality of lens data (100) prepared in the lens data preparation step in a predetermined region (200), a cutting step of, when an overlap (210) of lenses (100) occurs in the placement step, cutting out a part (421) of a lens shape to eliminate the overlap (210), and a repositioning step of replicating a shape of the cutout part (421) and repositioning it to another place.

Method for designing light diffusion pattern, method for manufacturing light diffusion plate, and light diffusion plate

PROBLEM TO BE SOLVED: To provide a method of producing a metal replica which reduces variation of the shrinkage factor and the difference in average shrinkage factor between in-plane directions and a method of producing a stamper.SOLUTION: A method of producing a metal replica includes an electrocasting step (I, M, T) of forming a metal electrodeposition layer on the surface of a mother die by electrodeposition. A graph which plots time changes of the density of an electric current applied to the mother die with the current density as the longitudinal axis and the time as the lateral axis is taken as the current density change curve (Cl); in the electrodeposition step, the quantity of the whole electricity applied through the increase of the current density is taken as Q; and the quantity of the whole electricity applied through the decrease of the current density is taken as Q. In the electrodeposition (I, M, T), the current density is controlled so as to meet the condition 0.20≤Q/Q≤5.00.

Hirai Masashi

Papers

Diffuser plate and method for producing diffuser plate

Diffusing plate and method for producing diffusing plate

Method for designing light diffusion pattern, method for manufacturing light diffusion plate, and light diffusion plate

Method of producing metal replica and method of producing stamper

A designing method for light diffusion pattern by using computer, a manufacturing method of a light diffusion plate and a light diffusion plate