CN1690841A - Rear projection screen - Google Patents
Rear projection screen Download PDFInfo
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- CN1690841A CN1690841A CN 200410038495 CN200410038495A CN1690841A CN 1690841 A CN1690841 A CN 1690841A CN 200410038495 CN200410038495 CN 200410038495 CN 200410038495 A CN200410038495 A CN 200410038495A CN 1690841 A CN1690841 A CN 1690841A
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- lens
- screen
- projection screen
- rear projection
- cylindrical projection
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Abstract
The back projection screen in this invention comprises a first lens plate and second lens plate. Wherein, the first lens plate has a first surface and second surface opposite, first surface has complex column protrusions, which extend to first direction, parallel to second direction perpendicular with first direction and whose heights decrease gradually from two sides of first lens plate to center at second direction; set the second lens plate on side of first, which has a third surface adjacent to second surface and fourth surface opposite,. This invention can solve that existing back projection screen vertical view angle and lightness gain can not adjust and control very easily, with bright band and the Moire phenomenon.
Description
Technical field
The present invention is about a kind of rear projection screen, especially a kind of rear projection screen of lens of the cylindrical projection with difference in height.
Background technology
Along with the lifting of video signal technology and the demand in market, rear projection screen (RearProjection Screen) applies to display screen, terminal screen (Monitor Screen), and multimedia show curtain (Multi-screenInstallation) or the like of rear-projection TV set (Rear Projection TV) widely in recent years.
Because rear projection screen is by the back side (Rear Side) projection image, the user that (FrontSide) watched can see image by rear projection screen.So when the design rear projection screen, must consider beholder's visual angle, contrast, resolution and the brightness of image or the like problem.
Please refer to Fig. 1, rear projection screen 1 is a penetrating type screen (Transmissive Screen), and rear projection screen 1 is mainly by 12 formations of a two-sided lens board (Double Side Lens Sheet) 11 and one horizontal Lenticular lens sheet (Horizontal Lenticular Lens Sheet).Mainly in order to promote the brightness and the uniformity coefficient of image, so that the light in the ken can be done good utilization, horizontal Lenticular lens sheet 12 is then in order to provide the imaging of image for two-sided lens plate 11.
As shown in Figures 1 and 2, two-sided lens plate 11 has vertical convex lens (VerticalLenticular Lens Sheet) 111, one substrate 112 and a Fresnel lens (FresnelLens) 113, make incident light that light source sent by vertical convex lens 111 incidents, through Fresnel lens 113 and optically focused, with in horizontal Lenticular lens sheet 12 imagings.
The vertical convex lens 111 that are positioned at two-sided lens plate 11 1 sides can be in order to the vertical angle of view of increase rear projection screen 1 and the luminance gain value (Gain) of screen.As shown in Figure 3, generally speaking, vertical convex lens 111 have a plurality of identical shaped cylindrical projection 1111, and promptly cylindrical projection 1111 has identical width and height.
Yet cylindrical projection 1111 shapes of rule on the vertical convex lens 111 often make the luminance gain value easy-regulating not of vertical angle of view and rear projection screen.Reason is that when the visual angle that has increased vertical direction, usually the luminance gain value of screen has just reduced.In addition, known vertical convex lens 111 with regular cylindrical projection 1111, because the light of screen edge can't look like center Screen portion can be complementary, so can cause the luminance shortage of screen edge, make that the central part of screen is brighter, and cause so-called bright band (Hot Band) in the central authorities of screen, influenced the homogeneity of picture brightness.And cylindrical projection 1111 shapes of rule, also easily make screen that the not phenomenon of A Bowen (Moire) is arranged, reduced the quality of picture especially.
Because the problems referred to above, the inventor urgently thinks a kind of luminance gain value regulation and control that can solve known rear projection screen vertical angle of view and screen and is difficult for, bright band is easily arranged and has not " rear projection screen " of A Bowen (Moire) phenomenon because of in this.
Summary of the invention
From the above, purpose of the present invention is for a kind of lens with cylindrical projection of difference in height are provided, to improve the problem of known rear projection screen.
For reaching above-mentioned purpose, comprise one first lens board and one second lens board according to rear projection screen of the present invention.Wherein, first lens board has a first surface and an and second surface that establish relative with first surface, first surface has a plurality of cylindrical projection, a plurality of cylindrical projection are extended toward a first direction, and it is arranged side by side mutually with a second direction vertical with first direction, the height of each cylindrical projection is reduced gradually by two side direction central authorities of first lens board on second direction, second lens board is arranged at a side of first lens board, second lens board has one the 3rd surface and and one four surface of establishing relative with the 3rd surface, and the 3rd is surperficial adjacent with second surface.
So, comply with the cylindrical projection that rear projection screen of the present invention has difference in height, and its height is successively decreased by two side direction central authorities of first lens board.Compare with known technology, rear projection screen of the present invention, the cylindrical projection height of vertical convex lens two sides is higher, and then has bigger vertical angle of view, so can complementary light.Thus, by the Level Change of cylindrical projection, not only be easy to the luminance gain value of vertical angle of view and screen, the light of screen two sides increases through complementary back angle, and has more reduced the bright band effect that center Screen takes place.In addition, also because the difference of cylindrical projection height, thus also improved the phenomenon of screen Moire, and then improved the quality of picture.
Description of drawings
One schematic perspective view of the known rear projection screen of Fig. 1;
One schematic side view of the two-sided lens of the known rear projection screen of Fig. 2;
One enlarged diagram of the known vertical convex lens of Fig. 3;
One schematic perspective view of Fig. 4 rear projection screen of the present invention;
One schematic side view of the vertical convex lens of Fig. 5 rear projection screen of the present invention;
One synoptic diagram of the cylindrical projection of Fig. 6 rear projection screen of the present invention is with the height of explanation cylindrical projection and the pass of vertical convex lens vertical angle of view; And
One synoptic diagram of second lens board of Fig. 7 rear projection screen of the present invention.
Symbol description among the figure:
1 rear projection screen
11 two-sided lens plates
111 vertical convex lens
1111 cylindrical projection
112 substrates
113 Fresnel lenses
12 horizontal Lenticular lens sheets
2 rear projection screens
21 first lens boards
211 first surfaces
212 second surfaces
213 cylindrical projection
214 first directions
215 second directions
22 second lens boards
221 the 3rd surfaces
222 the 4th surfaces
23 Fresnel lenses
24 oval convex lens
25 black-tape stripeds
H1～H2 height
V1～V2 vertical angle of view
Embodiment
For making content of the present invention easier to understand,, the preferred embodiment of rear projection screen of the present invention is described hereinafter with reference to relevant drawings.
At first, please refer to the rear projection screen that Fig. 4 to Fig. 7 specifies preferred embodiment of the present invention.
In the present embodiment, rear projection screen can apply to display screen, terminal screen and multimedia show curtain of rear-projection TV set or the like.
As shown in Figure 4, rear projection screen 2 of the present invention comprises one first lens board 21 and one second lens board 22.
First lens board 21, it has a first surface 211 and a second surface 212 relative with first surface 211 and that establish, and first surface 211 has a plurality of cylindrical projection 213.
Please refer to Fig. 4 and Fig. 5, a plurality of cylindrical projection 213 are extended toward first directions 214, and with a second direction 215 vertical with first direction 214 mutually side by side.In the present embodiment, a plurality of cylindrical projection 213 are vertical convex lens (Vertical Lenticular Lens), utilize pressing and forming, ejection formation or alternate manner to form a plurality of cylindrical projection 213, and its material can be plastics, for example is: PMMA (Polymethyl Methacrylate), PETG (Polyethylene Terephthalate Glycol), PS (Polystyrene), PC (Polycarbonate) or other co-polymer (Copolymer).
As Fig. 4 and shown in Figure 5, the height of each cylindrical projection 213 is reduced gradually by two side direction central authorities of first lens board 21 on second direction 215.In the present embodiment, the width of a plurality of cylindrical projection 213 is 0 μ m to 1mm, and highly is 0 μ m to 1mm, and has identical curvature.
Please refer to Fig. 5 and Fig. 6, cylindrical projection 213 height H 1 of two sides are higher on the second direction 215, and then have bigger vertical angle of view V1, so than the complementary light of energy; And cylindrical projection 213 height H 2 of middle section are lower, so have less vertical angle of view V2.Even, middle section also can not have any cylindrical projection 213 form plane, to send parallel rays.Thus, by the Level Change of cylindrical projection 213, not only be easy to the luminance gain value of vertical angle of view and screen, the light of screen two sides increases through complementary back angle, and has more reduced the bright band effect that center Screen takes place.In addition, also because of cylindrical projection 213 difference highly, so also improved the phenomenon of Moire.
In the present embodiment, as shown in Figure 4, rear projection screen 2 more comprises a Fresnel lens 23, and it is arranged at second surface 212.And Fresnel lens 23 by uniformly-spaced, the lens of concentric circles are formed.Fresnel lens 23 makes the light that leaves Fresnel lens 23 send in mode parallel to each other in order to collected light.
As Fig. 4 and shown in Figure 7, second lens board 22 is relative with first lens board 21 and establish.Second lens board 22 has one the 3rd surface 221, and and one four surface 222 of establishing relative with the 3rd surface 221, and the 3rd surperficial 221 is adjacent with second surface 212.In the present embodiment, second lens board 22 is a Lenticular lens sheet (Lenticular Lens).
In the present embodiment, rear projection screen 2 more comprises oval convex lens (EllipticalLenticular Lens) 24, and it is adjacent with second surface 212 that it is provided with 221, the three surfaces 221, one the 3rd surface, and oval convex lens are for uniformly-spaced arranging.
In the present embodiment, rear projection screen 2 more comprises a plurality of black-tape stripeds (Black Stripes) 25, and it is arranged at the 4th surface 222.
In sum, rear projection screen of the present invention has the cylindrical projection 213 of difference in height, and its height is successively decreased by two side direction central authorities of first lens board.Compare with known technology, rear projection screen of the present invention, the cylindrical projection 213 of vertical convex lens two sides is highly higher, and then has bigger vertical angle of view, so can complementary light.Thus, by the Level Change of cylindrical projection 213, not only be easy to the luminance gain value of vertical angle of view and screen, the light of screen two sides increases through complementary back angle, and has more reduced the bright band effect that center Screen takes place.In addition, also because of cylindrical projection 213 difference highly, thus also improved the phenomenon of screen Moire, and then improved the quality of picture.
The above only is an illustrative, but not is restricted person.Anyly do not break away from spirit of the present invention and category, and, all should be contained in the described claim its equivalent modifications of carrying out or change.
Claims (10)
1, a kind of rear projection screen, it is characterized in that, comprise: one first lens board, it has a first surface and an and second surface that establish relative with this first surface, this first surface has a plurality of cylindrical projection, these cylindrical projection are extended toward a first direction, and arranged side by side mutually with a second direction vertical with this first direction, and the height of each cylindrical projection is reduced gradually by two side direction central authorities of this first lens board on this second direction; And
One second lens board, it is relative with this first lens board and establish.
2, the described rear projection screen of claim 1, wherein these cylindrical projection are vertical convex lens.
3, the described rear projection screen of claim 1, wherein the material of these cylindrical projection is plastics.
4, the described rear projection screen of claim 1, wherein the width of these cylindrical projection is 0 μ m to 1mm.
5, rear projection screen as claimed in claim 1, wherein the height of these cylindrical projection is 0 μ m to 1mm.
6, rear projection screen as claimed in claim 1, wherein these cylindrical projection have identical curvature.
7, rear projection screen as claimed in claim 1 more comprises a Fresnel lens, and it is arranged at this second surface.
8, rear projection screen as claimed in claim 1, wherein this second lens board is a Lenticular lens sheet.
9, rear projection screen as claimed in claim 1, wherein this second lens board more comprises oval convex lens, and it is arranged at one the 3rd surface, and the 3rd surface is adjacent with this second surface.
10, the described rear projection screen of claim 1, wherein this second lens board more comprises a plurality of black-tape stripeds, and it is arranged at one the 4th surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410038495 CN1690841A (en) | 2004-04-29 | 2004-04-29 | Rear projection screen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410038495 CN1690841A (en) | 2004-04-29 | 2004-04-29 | Rear projection screen |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1690841A true CN1690841A (en) | 2005-11-02 |
Family
ID=35346362
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410038495 Pending CN1690841A (en) | 2004-04-29 | 2004-04-29 | Rear projection screen |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1690841A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7478913B2 (en) | 2006-11-15 | 2009-01-20 | 3M Innovative Properties | Back-lit displays with high illumination uniformity |
| US7766528B2 (en) | 2006-11-15 | 2010-08-03 | 3M Innovative Properties Company | Back-lit displays with high illumination uniformity |
| US7789538B2 (en) | 2006-11-15 | 2010-09-07 | 3M Innovative Properties Company | Back-lit displays with high illumination uniformity |
| US8690373B2 (en) | 2006-11-15 | 2014-04-08 | 3M Innovative Properties Company | Back-lit displays with high illumination uniformity |
| CN104503197A (en) * | 2014-12-22 | 2015-04-08 | 广东威创视讯科技股份有限公司 | Rear projection screen with adjustable view angle and gain |
-
2004
- 2004-04-29 CN CN 200410038495 patent/CN1690841A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7478913B2 (en) | 2006-11-15 | 2009-01-20 | 3M Innovative Properties | Back-lit displays with high illumination uniformity |
| US7766528B2 (en) | 2006-11-15 | 2010-08-03 | 3M Innovative Properties Company | Back-lit displays with high illumination uniformity |
| US7789538B2 (en) | 2006-11-15 | 2010-09-07 | 3M Innovative Properties Company | Back-lit displays with high illumination uniformity |
| US8690373B2 (en) | 2006-11-15 | 2014-04-08 | 3M Innovative Properties Company | Back-lit displays with high illumination uniformity |
| CN104503197A (en) * | 2014-12-22 | 2015-04-08 | 广东威创视讯科技股份有限公司 | Rear projection screen with adjustable view angle and gain |
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