TWM561819U - High contrast projection screen - Google Patents

Abstract

A high contrast projection screen comprising: a black base layer, a plurality of micro-twist structures and a plurality of light absorbing regions. The micro-structures are disposed on the black substrate layer, wherein each of the micro-structures comprises an incident surface, an active surface, and a bottom surface. The bottom surface is connected to the black base layer, and the incident surface, the active surface and the bottom surface of each micro-turn structure form a triangular structure. Each of the light absorbing regions is formed by one of the exposed sides of the black base layer, and is formed between the respective microscopic structures. The micro-structures adopt a transparent structure with a refractive index greater than 1.4, so that ambient light enters each micro-structure from each incident surface, and can be guided to the black base layer for absorption, thereby improving image contrast and clarity. degree.

Description

High-contrast projection screen

A projection screen, in particular, a projection screen having a microscopic structure and a light-absorbing area, which can effectively absorb ambient light and improve image contrast.

Please refer to FIG. 3, which is a schematic diagram of an application of a conventional projection screen. Generally speaking, the projection screen 90 can be used with a projection device 91, and the projection device 91 can be a general projector or a short-focus projector. As shown in FIG. 3, when the projection device 91 projects image light onto the projection screen 90, the projected image is displayed on the projection screen 90. However, when the image light is projected onto the projection screen 90, the image light is projected to the ceiling due to the reflection of the projection screen 90, so that a partial area 92 of the ceiling produces a double image that is the same as the image light, causing visual disturbance to the viewer. This bifocal imaging is especially obvious with a short-focus projector, because the short-focus projector can be set at a position very close to the projection screen 90, and does not need to be a distance from the projection screen 90 like a normal projector, so that in the After the image is projected, the image beam is easily reflected to the ceiling to produce a more obvious double image, which is more serious to the visual interference of the viewer.

In addition, please refer to FIG. 4, which is a schematic diagram of the projection screen 90 used in applications with ambient light. When the projection screen 90 is located on at least one ambient light source 93, whether the ambient light source 93 is an indoor lighting fixture or an external sun, when the ambient light generated by the ambient light source 93 shines on the projection screen 90, it will Blurring the projected image blurs the quality of the view. When the light intensity of the ambient light source 93 is higher, the degree of unclearness increases accordingly, and the clearer and clearer image cannot be seen. In addition, when the ambient light source 93 is present, the brightness of the projection device 91 must be increased. The brightness of the projected image is brighter, but the effect of increasing the brightness of the projection device 91 is limited, it cannot effectively improve the viewing quality, and it will increase the power consumption. The above-mentioned conditions limit the use of the projection screen 90 in places with low ambient light to provide high-quality and high-contrast images, thereby restricting the use of the projection screen 90.

Since the existing projection screen can only be used in a dark environment, whether it is selecting a suitable venue, turning off the lighting fixtures, or shielding the ambient light, it will increase the inconvenience of use. This creative department proposes a high-contrast projection screen. Provides high contrast and clear images in places with ambient light.

In order to achieve the above purpose, this creative high-contrast projection screen includes: a black base layer having a first side and a second side opposite to each other; a plurality of micro-structures arranged on the first side of the black base layer; A plurality of light absorption regions, each light absorption region is composed of the first surface exposed by the black base layer, and each light absorption region is located between adjacent micro-structures.

This creation uses the area exposed by the black base layer on the first side as a light absorption area, which can effectively absorb the light from the environment and reduce the ambient light entering the eyes of the viewer, thereby increasing the contrast of the image and improving the image. Clarity. Furthermore, because the ambient light from the environment is absorbed by these light-absorbing regions, the high-contrast projection screen can provide bright and clear pictures in an environment with general lighting brightness. In addition, the micro-chirped structure of this creation uses a transparent structure with a refractive index greater than 1.4, and is matched with a black base layer. After the ambient light enters these micro-chirped structures, it can be refracted to the black base layer and absorbed by it. To reduce the impact of ambient light on the viewer and increase the degree of contrast. And by adjusting the inclination angle of the active surface and the horizontal line in the micro chirp structure, the light beam of the image frame can be collected Medium projection to the eyes of the viewer allows the viewer to see a clear and high-contrast picture, and reduces the chance of ghosting on the ceiling or wall.

10‧‧‧ black base layer

11‧‧‧ the first side

12‧‧‧ second side

14‧‧‧ light absorption area

20‧‧‧ micro 稜鏡 structure

21‧‧‧ incidence plane

23‧‧‧active surface

25‧‧‧ underside

27‧‧‧Reflective layer

40‧‧‧ Projection device

60‧‧‧Ambient light source

80‧‧‧ eyes

90‧‧‧ projection screen

91‧‧‧ projection device

92‧‧‧area

93‧‧‧Ambient light source

94‧‧‧ eyes

θ1‧‧‧First tilt angle

θ2‧‧‧Second tilt angle

Figure 1: Schematic of this creative high-contrast projection screen.

Figure 2: Schematic diagram of the structure of this creation.

Figure 3: Schematic diagram of the application of a conventional projection screen with a short-focus projector.

Figure 4: Schematic diagram of conventional projection screen used in applications with ambient light.

Please refer to FIG. 1. The creative high-contrast projection screen system includes a black base layer 10, a plurality of micro chirp structures 20, and a plurality of light absorption regions 14.

The black base layer 10 is used to absorb ambient light from the environment, and has a first surface 11 and a second surface 12 opposite to each other. The ambient light source may be an indoor light fixture or sunlight from the outside.

The micro- 稜鏡 structures 20 are disposed on the first surface 11 of the black base layer 10. The micro- 稜鏡 structures 20 may be transparent structural layers. The refractive index of each micro-chirped structure 20 is greater than the outside air, wherein the refractive index of external air is 1, and in a preferred embodiment, the refractive index of each micro-chirped structure 20 is greater than 1.4.

As shown in FIG. 2, the cross-section of each micro- 稜鏡 structure 20 is a triangular structure. Viewed from the cross-section, it includes an incident surface 21, an active surface 23, and a bottom surface 25. The bottom surface 25 is disposed on the black substrate. A first inclination angle θ1 formed between the incident surface 21 and the horizontal line H on the first surface 11 of the layer 10 makes the slope of the incident surface 21 a negative slope. The active surface 23 and the horizontal line H Room A second inclination angle θ2 is formed, so that the inclination slope of the active surface 23 is in the form of a positive slope, and is inclined in the opposite direction to the incident surface 21, and the angle between the incident surface 21 and the active surface 23 is The angle sum of the first tilt angle θ1 plus the second tilt angle θ2 (θ1 + θ2). The incident surface 21 is located relatively above the action surface 23. A reflective layer 27 is further formed on the active surface 23.

Each light-absorbing region 14 is an area exposed by the black base layer 10 on the first surface 11. In this embodiment, the light-absorbing regions 14 are located between two micro-structures 20, specifically, a micro-edge The mirror structure 20, a light absorbing area 14, a micro-absorptive structure 20, a light-absorptive area 14 ... are arranged alternately and repeatedly, and in other preferred embodiments, each micro-absorptive structure 20 and each light-absorptive area 14 may The concentric circles are arranged in order or scattered, and the arrangement pitch can be adjusted according to actual conditions.

The reflective layer 27 is partially formed on the active surface 23. In a preferred embodiment, the reflective layer 27 is formed at a position relatively above the active surface 23. The reflective layer 27 is disposed on the active surface 23 by coating. The reflective layer 27 may be a white ink coating layer, a pearl ink coating layer, a silver ink coating layer, or a coating layer with high reflectivity.

Please refer to FIG. 1. Generally speaking, the high-contrast projection screen is set up in a projection environment. The projection environment includes at least one projection device 40 and at least one ambient light source 60. The projection device 40 may be a short-focus projector. The ambient light source 60 may be an indoor lighting fixture or sunlight from outside. As shown in FIG. 1, when the projection device 40 generates a projection light beam to the high-contrast projection screen, the projection light beam is first projected onto the reflection layer 27, and then reflected by the reflection layer 27 and enters a viewer's eye 80. When the ambient light source 60 is also the ambient light beam to the high-contrast projection screen, in general, the ambient light beam will enter the micro chirped structures 20 from the incident surfaces 21 and be refracted by the micro chirped structures 20 to the The black base layer 10 is finally absorbed by the black base layer 10, and each light absorption region 14 can directly absorb the ambient light beam. Since the ambient light beam is able to pass through the refraction of the micro chirped structure 20 and is effectively absorbed by the black base layer 10, the influence of the ambient light beam on the viewer's eyes 80 can be reduced, and the contrast degree and sharpness of the projected image can be relatively improved. So that the high-contrast projection screen is used in normal Under the lighting environment, there is no need to turn off the lights or pull up the curtains. It can still provide high-contrast, clear and vivid pictures. Even in bright environments, you do n’t need to use high-intensity projection equipment deliberately. The clear projected image is displayed so that this creation can be flexibly used in various occasions.

Furthermore, when the projection device 40 is a short-focus projector, since the position used by the short-focus projector is not far from the high-contrast projection screen, the projection beam can be projected on the high-contrast projection screen at a short distance, and By adjusting the second inclination angle θ2 formed between the active surface 23 and the horizontal line H, the light output angle of the projection beam is kept within the range of the viewer's line of sight, and the projection beam is prevented from reflecting to the ceiling, which reduces the occurrence of complex reflections on the ceiling. It can reflect most of the projection light beam to the viewer's eyes 80, so that the degree of interference of the viewer is reduced, and better viewing quality is provided.

Claims (4)

A high-contrast projection screen includes: a black base layer having a first surface and a second surface opposite to each other; a plurality of microstructures arranged on the first surface of the black base layer; and a plurality of light absorption regions, Each light-absorbing region is formed by the first surface exposed by the black base layer, and each light-absorbing region is located between adjacent microcapsule structures. The high-contrast projection screen described in claim 1, the refractive index of each micro-chirped structure is greater than 1.4. The high-contrast projection screen described in claim 2, the cross-section of each micro- 稜鏡 structure is a triangle, including an incident surface, an active surface, and a bottom surface, wherein the bottom surface is disposed on the first of the black base layer. Plane, a first inclination angle is formed between the incident surface and the horizontal line, so that the slope of the incident surface is a negative slope, and a second inclination angle is formed between the active surface and the horizontal line, the inclination of the active surface Positive slope. According to the high-contrast projection screen described in claim 3, each micro-macrostructure has a reflective layer, and the reflective layer is disposed at a position relatively above the active surface.