CN2674482Y - Three lens liquid crystal projector - Google Patents
Three lens liquid crystal projector Download PDFInfo
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- CN2674482Y CN2674482Y CN 200420019709 CN200420019709U CN2674482Y CN 2674482 Y CN2674482 Y CN 2674482Y CN 200420019709 CN200420019709 CN 200420019709 CN 200420019709 U CN200420019709 U CN 200420019709U CN 2674482 Y CN2674482 Y CN 2674482Y
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- liquid crystal
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- projection lens
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Abstract
The utility model relates to a three-lens liquid crystal projection device, which belongs to the technical field of projection. The utility model comprises a projection light source system, a colored light separation system, three liquid crystal light valves, a first projection lens, a second projection lens, a third projection lens and an imaging display system. The colored light separation system is arranged behind the projection light source system. The three liquid crystal light valves are arranged behind the colored light separation system. The first projection lens, the second projection lens and the third projection lens are arranged behind the three liquid crystal light valve. The imaging display system is arranged behind the first projection lens, the second projection lens and the third projection lens. Anti-reflection films are plated on lenses in the first projection lens, the second projection lens and the third projection lens corresponding to the relative narrow wave ranges respectively according to the wave ranges of the first colored light, the second colored light, and the third colored light in the location channel of the first projection lens, the second projection lens and the third projection lens. The ANSI contrast degree of the utility model is greatly enhanced, and the bottleneck restriction problem of the ANSI contrast degree of the projection lens of the single-lens liquid crystal projector to the whole machine is efficiently solved. The brightness of the three-lens liquid crystal projector has a larger promotion compared with the single-lens liquid crystal projector.
Description
Technical field
The utility model relates to a kind of projection arrangement, and particularly a kind of three-lens liquid crystal projection apparatus belongs to the shadow casting technique field.
Background technology
General liquid crystal projector (comprising transmission type LCD liquid crystal projection apparatus and reflective LCOS liquid crystal projection apparatus) has single-lens formula and three-lens formula, the liquid crystal projector of no matter single-lens or three-lens, the general in design white light that all is elder generation introduces a projecting lamp is isolated and can be synthesized first of described white light, the second and the 3rd coloured light, by three default liquid crystal light valves described coloured light is modulated respectively, three coloured light after the modulation are with difference single-lens or the three-lens design, and in single-lens design with three coloured light with closing that color component is synthesized and by the single lens projection imaging, or in the three-lens design, three coloured light are projected to imaging on the same screen via three different camera lenses respectively.Wherein single-lens formula has the advantages that volume is little, be convenient for carrying, but its back focal length and limited ability at the bigger picture of short distance inner projection, and optical modules such as employed camera lens and spectroscope are very high to the requirement of quality, precision, cause cost higher.And traditional single-lens liquid crystal projector, because the restriction of optics processing and film plating technology is difficult to further improve these two key technical index of brightness and contrast.
Traditional liquid crystal projector exists the brightness and contrast to be difficult to the problem that increases in (comprising transmission type LCD liquid crystal projection apparatus and reflective LCOS liquid crystal projection apparatus).The relevant method of improving the liquid crystal projector brightness and contrast is also arranged at present, find by literature search, Chinese patent application number is 01809852.5 patent of invention, this patent proposes between two polarizers, there have the blooming (HBLC blooming) of the liquid crystal layer of mixed orientation to be arranged in the slow axis that makes film to two of major generals to be roughly orthogonal, to improve the liquid crystal projector contrast perpendicular to the way that does not produce phase differential on the direction of film surface.But because " bottleneck " that the liquid crystal projector brightness and contrast improves is camera lens, so the improvement of the method is very limited.
Summary of the invention
The utility model proposes a kind of three-lens liquid crystal projector at above-mentioned deficiency and defective in the background technology, makes it can project big picture in than short distance, and picture brightness and contrast all improve a lot.
The utility model is achieved through the following technical solutions, the utility model is on the basis of available liquid crystal projector, adopt three-lens formula structure, comprise: projection source system, coloured light piece-rate system, three liquid crystal light valves, first, second and the 3rd projection lens, imaging display system, its connected mode is: the coloured light piece-rate system is set after the projection light source system, coloured light piece-rate system back is provided with three liquid crystal light valves, three liquid crystal light valve back are provided with first, second and the 3rd projection lens, and the picture display system is arranged in first, second and the 3rd projection lens back.First, second and the 3rd projection lens can be the in-line line spread, also can be Chinese character pin-shaped arrangement, also can be triangularly arranged.First, second carries out relative narrow wave band plating anti-reflection film according to first, second of place passage with the 3rd coloured light wave band respectively with lens in the 3rd projection lens.The transmitance of the anti-reflection film that plates is than the transmitance height of anti-reflection film that lens plate in the projection lens of single-lens formula liquid crystal projector.
During work, the white light that a projection source system is introduced is isolated first, second and the 3rd coloured light that can synthesize described white light by the coloured light piece-rate system earlier, by three default liquid crystal light valves described coloured light is modulated respectively, first, second after the modulation is that first, second and the 3rd projection lens projects are closed the look imaging to same screen via three different camera lenses respectively with the 3rd coloured light.
The utility model adopts three-lens formula structure, lens in the corresponding projection lens of three coloured light carry out narrow relatively wave band plating anti-reflection film according to the coloured light wave band of place passage respectively, make it can in than short distance, project big picture, picture brightness and contrast all improve a lot, especially the raising of contrast is very significant, effectively solves the bottleneck restricted problem of the projection lens of single-lens formula liquid crystal projector to complete machine ANSI contrast.The utility model three-lens liquid crystal projection apparatus both can be used for the pre-projecting type liquid crystal projection apparatus, also can be used for the back projection type liquid crystal projection apparatus.
Description of drawings
Fig. 1 structural representation of the present utility model
Embodiment
As shown in Figure 1, the utility model adopts three-lens formula structure, comprise: projection source system 1, coloured light piece-rate system 2, three liquid crystal light valves 3, first, second and the 3rd projection lens 4, imaging display system 5, its connected mode is: coloured light piece-rate system 2 is set after the projection light source system 1, coloured light piece-rate system back is provided with three liquid crystal light valves 3, three liquid crystal light valves, 3 back are provided with first, second and the 3rd projection lens 4, and picture display system 5 is arranged in first, second and the 3rd projection lens 4 back.First, second and the 3rd projection lens 4 are the in-line line spread, perhaps are Chinese character pin-shaped arrangement, perhaps are triangularly arranged.First, second carries out relative narrow wave band plating anti-reflection film according to first, second of place passage with the 3rd coloured light wave band respectively with lens in the 3rd projection lens 4.The transmitance of the anti-reflection film that plates is than the transmitance height of anti-reflection film that lens plate in the projection lens of single-lens formula liquid crystal projector.
Because the restriction of optical coating technology, under identical cost, generally plating narrow wave band anti-reflection film at lens surface compares with plating broadband anti-reflection film, the transmitance that the former obtains can be higher than the latter, the ratio that exceeds may not be a lot of for single surface, but the projection lens lens number used owing to liquid crystal projector is a lot, and like this, the accumulation effect on a plurality of surfaces will demonstrate very big difference.
Below in conjunction with embodiment the utility model is done further to understand:
Liquid crystal projection apparatus A, its projection lens is made of 13 lens, and wherein 4 cemented doublets then have 2 * (13-4)=18 surfaces to need the plating anti-reflection film in the camera lens.
If this projection arrangement A uses single-lens formula structure, require each lens surface on whole visible light wave range, to plate anti-reflection film, because the bandwidth that plated film requires is very wide, so the transmitance behind the single surface plating anti-reflection film can only accomplish 99.5%.At this moment, if disregard the absorption (following result of calculation is all disregarded) of glass material, the visible light of unit energy can be 91.4% by the light on this camera lens arrival screen in theory, and can be by repeatedly reflection, the luminous energy (bias light) that arrives on the screen after the transmission is 0.74%, the ANSI contrast that so just limits this projection arrangement is about 124: 1, certainly some can be projected the sleeve wall absorption of camera lens to bias light in the process of repeatedly reflection projection, and make the bias light that arrives on the screen reduce, but test confirms that actual ANSI contrast is also only below 200: 1.
If this projection arrangement A uses three-lens formula structure, then require each lens surface on the coloured light wave band of place passage, to plate anti-reflection film, promptly the lens wearer of the first coloured light passage is only to the first coloured light wave band plated film, the lens wearer of the second coloured light passage is only to the second coloured light wave band plated film, and the lens wearer of the 3rd coloured light passage is only to the 3rd coloured light wave band plated film.The bandwidth of plated film requirement narrows down like this, and the transmitance behind the single surface plating anti-reflection film can be accomplished more than 99.8%.At this moment, the visible light of unit energy can be 96.5% by the light on this camera lens arrival screen in theory, and the luminous energy on the arrival screen (bias light) is 0.13%, the ANSI contrast of this projection arrangement is about 770: 1 like this, if consider that again some can be projected the sleeve wall absorption of camera lens to bias light in the process of repeatedly reflection projection, and make the bias light that arrives on the screen reduce, then can obtain ANSI contrast greater than 800: 1.
Liquid crystal projection apparatus B, its projection lens is made of 11 lens, and wherein 4 cemented doublets then have 2 * (11-4)=14 surfaces to need the plating anti-reflection film in the camera lens.
If this projection arrangement B uses single-lens formula structure, the transmitance behind the same single surface plating anti-reflection film can only accomplish 99.5%.At this moment, the visible light of unit energy can be 93.2% by the light on this camera lens arrival screen in theory, can bias light be 0.46%, and the ANSI contrast that so just limits this projection arrangement is about 200: 1.
If this projection arrangement B uses three-lens formula structure, the transmitance behind the then single surface plating anti-reflection film can be accomplished more than 99.8%.At this moment, the visible light of unit energy can be 97.2% by the light on this camera lens arrival screen in theory, and the luminous energy (bias light) that arrives on the screen is 0.08%, and the ANSI contrast of this projection arrangement was above 1000: 1 like this.
From as can be seen above, three-lens formula liquid crystal projection apparatus can be greatly improved than the ANSI contrast of single-lens formula liquid crystal projection apparatus, effectively solves the bottleneck restricted problem of the projection lens of single-lens formula liquid crystal projection apparatus to complete machine ANSI contrast.And three-lens formula liquid crystal projection apparatus has also obtained bigger lifting than the brightness of single-lens formula liquid crystal projection apparatus.
Claims (4)
1, a kind of three-lens liquid crystal projection apparatus, comprise: projection source system (1), coloured light piece-rate system (2), three liquid crystal light valves (3), first, the second and the 3rd projection lens (4), imaging display system (5), it is characterized in that, adopt three-lens formula structure, its connected mode is: coloured light piece-rate system (2) is set after the projection light source system (1), coloured light piece-rate system (2) back is provided with three liquid crystal light valves (3), three liquid crystal light valves (3) back is provided with first, the second and the 3rd projection lens (4), first, picture display system (5) is arranged in the second and the 3rd projection lens (4) back.
2, three-lens liquid crystal projection apparatus according to claim 1 is characterized in that, first, second carries out relative narrow wave band plating anti-reflection film according to first, second of place passage with the 3rd coloured light wave band respectively with lens in the 3rd projection lens (4).
3, three-lens liquid crystal projection apparatus according to claim 2 is characterized in that, the transmitance of the anti-reflection film that plates is than the transmitance height of anti-reflection film that lens plate in the projection lens of single-lens formula liquid crystal projector.
4, three-lens liquid crystal projection apparatus according to claim 1 and 2 is characterized in that, first, second and the 3rd projection lens (4) are the in-line line spread, perhaps are Chinese character pin-shaped arrangement, perhaps are triangularly arranged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420019709 CN2674482Y (en) | 2004-01-19 | 2004-01-19 | Three lens liquid crystal projector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420019709 CN2674482Y (en) | 2004-01-19 | 2004-01-19 | Three lens liquid crystal projector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2674482Y true CN2674482Y (en) | 2005-01-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420019709 Expired - Fee Related CN2674482Y (en) | 2004-01-19 | 2004-01-19 | Three lens liquid crystal projector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2674482Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102636944A (en) * | 2011-02-15 | 2012-08-15 | 亚洲光学股份有限公司 | Projector with double projection function |
-
2004
- 2004-01-19 CN CN 200420019709 patent/CN2674482Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102636944A (en) * | 2011-02-15 | 2012-08-15 | 亚洲光学股份有限公司 | Projector with double projection function |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |