Structure of short-throw ambient light rejecting screen

Abstract

The present invention provides a structure of short-throw ambient light rejecting screen, which comprises a base and an optical structure device disposed on the base. The optical structure device includes a plurality of optical structure parts. Each of the plurality of optical structure parts includes a first side, a second side, and a base part. The first side and the base form a first angle for reflecting a light source. The second side and the base form a second angle for absorbing a light source. The base part is a length on the base confined by first side and the second side. The first angle is 20˜40 degrees. The second angle is 70˜90 degrees. The length on the base part is 250˜350 um. By adjusting the first angle, the second angle, and the length on the base part of each optical structure part, the height of the optical structure part can be maintained constant. In addition, the differences between the incident projection angles can be reduced as well. By improving the process yield, the appearance of the scrolled screen can form a neat cylinder.

Claims

1. A structure of short-throw ambient light rejecting screen, comprising: a base; and an optical structure device, disposed on said base, including a plurality of optical structure parts, and each of said plurality of optical structure parts including: a first side, forming a first angle with said base for reflecting a light source; a second side, forming a second angle with said base for absorbing a light source; and a base part, being a length on said base and confined by said first side and said second side; where said first angle is 20˜40 degrees; said second angle is 70˜90 degrees; and said length on said base part is 250˜350 um, said first angles and said second angles of said optical structure parts are increased gradually while said lengths of said base parts included in said optical structure parts are decreased gradually, and heights of said optical structure parts are maintained constant.

2. The structure of short-throw ambient light rejecting screen of claim 1, wherein said base is formed by polyethylene terephthalate (PET) or thermoplastic polyurethanes (TPU).

3. The structure of short-throw ambient light rejecting screen of claim 1, wherein the sum of the height of said base and the height of said optical structure device is 360˜400 um.

4. The structure of short-throw ambient light rejecting screen of claim 1, wherein said base further includes a black absorbing layer disposed below said base for increasing light absorptivity.

5. The structure of short-throw ambient light rejecting screen of claim 1, wherein said first side further includes an image reflection layer.

6. The structure of short-throw ambient light rejecting screen of claim 5, wherein said image reflection layer further includes a glue layer and an anti-glare layer disposed on said glue layer.

7. The structure of short-throw ambient light rejecting screen of claim 6, wherein said anti-glare layer is formed by micro transparent particles or silicon dioxide.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 shows a schematic diagram of the structure of short-throw ambient light rejecting screen according to an embodiment of the present invention;

(2) FIG. 2A shows a schematic diagram of the structure of short-throw ambient light rejecting screen according to the first embodiment of the present invention;

(3) FIG. 2B shows a schematic diagram of the structure of short-throw ambient light rejecting screen according to the second embodiment of the present invention; and

(4) FIG. 2C shows a schematic diagram of the structure of short-throw ambient light rejecting screen according to the third embodiment of the present invention.

DETAILED DESCRIPTION

(5) In the grading structure of the ambient light rejecting screen according to the prior art, the structure height is not considered. Consequently, the fabrication difficulty is increased; the flatness of the film surface is lowered; and the height differences occur on the film surface of the product.

(6) The present invention provides a structure of ambient light rejecting screen. By adjusting the first angle, the second angle, and the length on the base part of each optical structure part, the height of the grading structure and the structure can be maintained constant. By improving the flatness of the film of the product, the appearance of the scrolled screen can form a neat cylinder.

(7) In the following description, various embodiments of the present invention are described using figures for describing the present invention in detail. Nonetheless, the concepts of the present invention can be embodied by various forms. Those embodiments are not used to limit the scope and range of the present invention.

(8) First, please refer to FIG. 1, which shows a schematic diagram of the structure of short-throw ambient light rejecting screen according to an embodiment of the present invention. The present invention provides a structure of short-throw ambient light rejecting screen, which comprises a base 1 and an optical structure device 2 disposed on the base 1. The optical structure device 2 includes a plurality of optical structure parts 21. Each of the plurality of optical structure parts 21 includes a first side 211, a second side 212, and a base part 213. The first side 211 and the base 1 form a first angle θ1, which is 20˜40 degrees. The second side 212 and the base 1 form a second angle θ2, which is 70˜90 degrees. The base part 213 is a length on the base 1, which is 250˜350 um. In other words, the optical structure part 21 form a sawtooth structure using the first side 211, the second side 212, and the base part 213. When a user uses the projector P to project a light source to the optical structure device 2, the first side 211 of the optical structure part 21 reflects the light source to the user for viewing.

(9) According to the present embodiment, the base 1 further includes a black absorbing layer disposed below the base 1 for increasing light absorptivity effectively. The base is formed by polyethylene terephthalate (PET) or thermoplastic polyurethanes (TPU). The base height H1 is approximately 188 um. The height H2 of the optical structure part 21 is approximately 192 um. Namely, the sum of the base height H1 and the height H2 of the optical structure part 21 is 380 um with the manufacturing tolerance of ±20 um. The first side 211 includes an image reflection layer, which includes a glue layer and an anti-glare layer disposed on the glue layer for avoiding reflection from the glue layer. The anti-glare layer is formed by micro transparent particles or silicon dioxide.

(10) Please refer to FIG. 2A, which shows a schematic diagram of the structure of short-throw ambient light rejecting screen according to the first embodiment of the present invention. The first angles of the plurality of optical structure parts 21 are θ1, θ1′, and θ1″, respectively, and equal to 40, 30, and 20 degrees, respectively. The second angles of the plurality of optical structure parts 21 are θ2, θ2′, and θ2″, respectively, and equal to 90, 80, and 70 degrees, respectively. The length of the base part 213 are D1, D2, and D3, respectively, and equal to 250 um, 300 um, and 350 um, respectively. Thereby, the height H2 of the optical structure part 21 can be maintained constant. In other words, the first angles and the second angles decrease gradually while the lengths of the base part 213 increase gradually.

(11) Please refer to FIG. 2B, which shows a schematic diagram of the structure of short-throw ambient light rejecting screen according to the second embodiment of the present invention. The first angles of the plurality of optical structure parts 21 are θ1, θ1′, and θ1″, respectively, and equal to 20, 30, and 40 degrees, respectively. The second angles of the plurality of optical structure parts 21 are θ2, θ2′, and θ2″, respectively, and equal to 70, 80, and 90 degrees, respectively. The length of the base part 213 are D1, D2, and D3, respectively, and equal to 350 um, 300 um, and 250 um, respectively. Thereby, the height H2 of the optical structure part 21 can be maintained constant. In other words, the first angles and the second angles increase gradually while the lengths of the base part 213 decrease gradually.

(12) Please refer to FIG. 2C, which shows a schematic diagram of the structure of short-throw ambient light rejecting screen according to the third embodiment of the present invention. The first angles of the plurality of optical structure parts 21 are θ1, θ1′, and θ1″, respectively, and equal to 40, 20, and 30 degrees, respectively. The second angles of the plurality of optical structure parts 21 are θ2, θ2′, and θ2″, respectively, and equal to 90, 70, and 80 degrees, respectively. The length of the base part 213 are D1, D2, and D3, respectively, and equal to 250 um, 350 um, and 300 um, respectively. Thereby, the height H2 of the optical structure part 21 can be maintained constant. In other words, the first angles and the second angles increase gradually while the lengths of the base part 213 decrease gradually.

(13) Specifically, the first angle θ1 of the plurality of optical structure parts 21 can be adjusted within the range of 20˜40 degrees. The adjusting method can be regular, such as increasing gradually from 20 degrees to 24, 26, and 40 degrees. Alternatively, the first angle θ1 can be decreased gradually from 40 degrees to 38, 36, and 20 degrees. Alternatively, the adjusting method can be irregular, such as 27, 30, and 36 degrees. Likewise, the second angle θ2 of the plurality of optical structure parts 21 can be adjusted within the range of 70˜90 degrees. The adjusting method can be regular, such as increasing gradually from 70 degrees to 72, 74, and 90 degrees. Alternatively, the second angle θ2 can be decreased gradually from 90 degrees to 88, 86, and 70 degrees. Alternatively, the adjusting method can be irregular, such as 78, 85, and 76 degrees. As for the lengths of the base parts 213, since the first angles θ1 and the second angles θ2 are different, the lengths of the base parts 213 will be within 250˜350 um.

(14) According to the embodiment of the present invention, by adjusting the first angle θ1, the second angle θ2, and the length on the base part 213 of each optical structure part 21, the height H2 of the optical structure part 21 can be maintained constant. Thereby, the differences between the incident projection angles can be reduced. By improving the process yield, the appearance of the scrolled screen can form a neat cylinder.

(15) To sum up, the present invention provides a structure of short-throw ambient light rejecting screen. By adjusting the first angle between the first side of the optical structure part and the base, the second angle between the second side of the optical structure part and the base, and the length on the base part of the optical structure part, the height of the optical structure part can be maintained constant. In addition, the differences between the incident projection angles can be reduced as well. By improving the process yield, the appearance of the scrolled screen can form a neat cylinder.