CN109729323B - Projection system - Google Patents
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- CN109729323B CN109729323B CN201711023325.1A CN201711023325A CN109729323B CN 109729323 B CN109729323 B CN 109729323B CN 201711023325 A CN201711023325 A CN 201711023325A CN 109729323 B CN109729323 B CN 109729323B
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Abstract
The invention discloses a projection system. The system comprises a light source module, a first lens group, a local dimming display, a second lens group, an imaging display and a projection lens, wherein the first lens group, the local dimming display, the second lens group, the imaging display and the projection lens are arranged on a preset optical path, light generated by the light source module passes through the first lens group, the local dimming display, the second lens group, the imaging display and the projection lens to form an image light source, the light generated by the light source module passes through the regulation and control of the local dimming display to regulate the luminous flux of the light, and a regulation and control area of the local dimming display corresponds to at least one pixel area of the imaging display. Therefore, the invention achieves the effect of improving the contrast of the image.
Description
Technical Field
The present invention relates to a projection system, and more particularly, to a projection system capable of improving image contrast.
Background
First, with the advent of the information age and the development of optical technology and projection display technology, digital projectors capable of outputting high resolution and large screens have become an indispensable part in providing visual images in enterprise presentations, conference activities, educational training, and even home entertainment. Therefore, the projector has high image quality, high brightness, and light weight, and has become a great indicator for consumers to choose.
However, in the prior art, the conventional projection system is mostly a Dynamic Contrast technique, that is, a Dynamic Global Dimming (Dynamic Global Dimming) is used to adjust the Contrast (Contrast Ratio) of the image. However, the dynamic global dimming mechanism dims or brightens the entire image, which results in poor visual performance of the image.
Disclosure of Invention
The present invention is directed to a projection system capable of improving the natural contrast of an image, which is a technique for improving the contrast without dynamic time sharing.
In order to solve the above technical problems, one technical solution of the present invention is to provide a projection system, which includes a light source module, a first lens group, a local dimming display, a second lens group, an image display, and a projection lens. The light source module can generate light along a predetermined optical path, the first lens group is adjacently arranged beside one side of the light source module, the first lens group is arranged on the predetermined optical path, the local dimming display is adjacently arranged beside one side of the light source module, the local dimming display is arranged on the predetermined optical path, the second lens group is adjacently arranged beside one side of the light source module, the second lens group is arranged on the predetermined optical path, the imaging display is adjacently arranged beside one side of the light source module, the imaging display is arranged on the predetermined optical path, the projection lens is adjacently arranged beside one side of the light source module, and the projection lens is arranged on the predetermined optical path, wherein the light can pass through the first lens group, The local dimming display, the second lens group, the imaging display and the projection lens, wherein the light passes through the imaging display and the projection lens to form an image light source imaged on a screen.
Further, the resolution of the local dimming type display is less than or equal to the resolution of the imaging display.
Furthermore, the local dimming type display has a plurality of control regions, the imaging display has a plurality of pixel regions, and each of the control regions of the local dimming type display corresponds to one or more of the pixel regions of the imaging display.
Further, the local dimming type display is an LCoS panel, a DLP panel, or an LCD panel.
Still further, the imaging display is an LCoS panel, DLP panel, or LCD panel.
Further, the imaging display is of a one-piece structure or a multi-piece structure.
Furthermore, the local dimming type display is arranged on a light source first secondary imaging area, and the imaging display is arranged on a light source second secondary imaging area.
Still further, the projection system further comprises: and the control module is electrically connected with the local dimming display and the imaging display.
Furthermore, the local dimming display is controlled by the control module to adjust the luminous flux of the light rays passing through the local dimming display.
In another embodiment of the present invention, a projection system is provided, which includes a light source module, a first lens set, a local dimming display, a second lens set, an image display, and a projection lens. The first lens group, the local dimming display, the second lens group, the imaging display and the projection lens are arranged on a preset optical path. Wherein, a light generated by the light source module passes through the first lens group, the local dimming display, the second lens group, the imaging display and the projection lens to form an image light source. The light rays generated by the light source module are regulated and controlled by the local dimming type display so as to adjust the luminous flux of the light rays. Wherein a control region of the local dimming type display corresponds to at least one pixel region of the imaging display.
One of the benefits of the projection system of the present invention is that the projection system provided in the embodiment of the invention can improve the contrast of the image by using the technical scheme that the light can pass through the first lens group, the local dimming display, the second lens group, the image display and the projection lens.
For a better understanding of the features and technical content of the present invention, reference should be made to the following detailed description of the invention and accompanying drawings, which are provided for purposes of illustration and description only and are not intended to limit the invention.
Drawings
FIG. 1 is a diagram illustrating an optical path of a projection system according to a first embodiment of the present invention.
Fig. 2 is a corresponding schematic view of a local dimming display and an image display according to an embodiment of the invention.
Fig. 3 is another corresponding diagram of the local dimming display and the image display according to the embodiment of the invention.
FIG. 4 is a functional block diagram of a projection system according to an embodiment of the present invention.
FIG. 5 is a diagram illustrating an optical path of a projection system according to a second embodiment of the present invention.
FIG. 6 is a diagram illustrating an optical path of a projection system according to a third embodiment of the present invention.
FIG. 7 is a diagram illustrating an optical path of a projection system according to a fourth embodiment of the present invention.
FIG. 8 is a diagram illustrating an optical path of a projection system according to a fifth embodiment of the present invention.
Detailed Description
The following is a description of embodiments of the present disclosure relating to a "projection system" with specific embodiments, and those skilled in the art will appreciate the advantages and effects of the present disclosure from the disclosure herein. The invention is capable of other and different embodiments and its several details are capable of modification in various other respects, all without departing from the spirit and scope of the present invention. The drawings of the present invention are for illustrative purposes only and are not drawn to scale. The following embodiments will further explain the technical contents related to the present invention in detail, but the disclosure is not intended to limit the technical scope of the present invention.
It will be understood that, although the terms first, second, third, etc. may be used herein to describe various elements or signals, etc., these elements or signals should not be limited by these terms. These terms are used to distinguish one element from another element, or from one signal to another signal. In addition, as used herein, the term "or" may include all combinations of any one or more of the associated listed items as appropriate.
First embodiment
First, referring to fig. 1, fig. 1 is a schematic diagram illustrating an optical path of a projection system according to a first embodiment of the invention. The invention provides a projection system U, which comprises a light source module 1, a first lens group 2, a local dimming type display 3 (a local dimming type display panel), a second lens group 4, an imaging display 5 and a projection lens 6. The Light source module 1 can generate a Light L along a predetermined optical path, for example, the Light source module 1 can be an Ultra-High Efficiency (UHE) or Ultra-High Performance (UHP) Ultra-High pressure mercury lamp, or a Light-Emitting Diode (LED) or a laser, or in other embodiments, the Light source module 1 can also be composed of three Light source units (please refer to fig. 7 and 8, the first Light source unit 11, the second Light source unit 12, and the third Light source unit 13), and the three Light source units can respectively generate red Light (generated by the first Light source unit 11), green Light (generated by the second Light source unit 12), and blue Light (generated by the third Light source unit 13). It should be noted that fig. 1 in the first embodiment is a schematic diagram for explaining the main concepts of the present disclosure, and the specific embodiments will be further described in the following embodiments.
In view of the above, in the first embodiment, the first lens group 2 can be disposed adjacent to one side of the light source module 1, and the first lens group 2 is located on the predetermined optical path. Then, the local dimming display 3 may be adjacently disposed beside one side of the light source module 1, and the local dimming display 3 is located on the predetermined optical path. In addition, the second lens group 4 can be adjacently disposed beside one side of the light source module 1, and the second lens group 4 is located on the predetermined optical path. Further, an Imaging Micro Display 5(Imaging Micro Display) may be adjacently disposed beside one side of the light source module 1, and the Imaging Display 5 is located on a predetermined optical path. Further, the projection lens 6 may be adjacently disposed beside one side of the light source module 1, and the projection lens 6 is located on a predetermined optical path. In the embodiment of the present invention, the local dimming display 3 can be disposed between the first lens group 2 and the second lens group 4, and the image display 5 can be disposed between the second lens group 4 and the projection lens 6, so that the light L generated by the light source module 1 can pass through the first lens group 2, the local dimming display 3, the second lens group 4, the image display 5 and the projection lens 6. That is, the light L can sequentially pass through the local dimming display 3 and the imaging display 5. Further, the light L passes through the image display 5 and the projection lens 6 to form an image light source (not shown) imaged on a screen 7 (the screen 7 may be a wall or a projection screen). It should be noted that the specific configurations of the first lens group 2, the second lens group 4, the image display 5 and the projection lens 6 in the projection system U are well known in the art, and will not be described herein.
In view of the above, it should be particularly noted that the Light L passing through (or can be said to pass through) the first lens group 2 is projected onto the local dimming display 3 in an imaging manner, that is, the Light L passing through the local dimming display 3 is of an imaged Light type, for example, the local dimming display 3 may be a transmissive panel, but the invention is not limited thereto, and in other embodiments, the local dimming display 3 may also be a reflective LCoS (Liquid Crystal on Silicon) panel or a Digital Light Processing (DLP) panel, but the local dimming display may be used with a polarizing Prism or a Total Internal Reflection Prism (TIR Prism), for example. The light L passes through the image display 5 and the projection lens 6, and then is imaged on the screen 7. That is, the local dimming type display 3 may be disposed on a light source first sub-imaging region, and the imaging display 5 may be disposed on a light source second sub-imaging region. Thereby, the local dimming display 3 can be used as a light valve. It should be noted that, in the first embodiment, the image display 5 may be an LCoS (Liquid Crystal on Silicon) display, however, in other embodiments, the image display 5 may be an lcd (Liquid Crystal display) or a dlp (digital Light processing) by changing the structures of the first lens group 2 and the second lens group 4, and the invention is not limited thereto. In other words, the imaging display 5 may be an LCoS panel, a DLP panel, or an LCD panel.
Next, please refer to fig. 2, in which fig. 2 is a schematic diagram of a correspondence between the local dimming type display and the imaging display according to the embodiment of the invention, and the correspondence between the local dimming type display 3 and the imaging display 5 will be further described below. In detail, the local dimming display 3 may have a plurality of control regions (P11-Pij), the image display 5 may have a plurality of pixel regions (M11-Mij), and the plurality of control regions Pij of the local dimming display 3 may respectively correspond to the plurality of pixel regions Mij of the image display 5. For example, the resolution of the local dimming display 3 may be less than or equal to the resolution of the imaging display 5. Preferably, the resolution of the local dimming display 3 may be smaller than that of the imaging display 5 to achieve the effect of reducing the cost.
Further, referring to fig. 2 again, for the embodiment of fig. 2, the resolution of the local dimming display 3 may be equal to the resolution of the imaging display 5. Meanwhile, the plurality of control regions Pij of the local dimming display 3 may be a grid region, and each grid region may be controlled by a driving chip (not shown) of the local dimming display 3, so that each control region Pij may be selectively turned on or off. Thereby, the luminous flux of the light L passing through the local dimming display 3 is adjusted. That is, the light L generated by the light source module 1 is regulated and controlled by the local dimming display 3 to adjust the luminous flux of the light L. In other words, the projection system U provided by the embodiment of the present invention has an effect of local dimming (local dimming) control by setting the local dimming display 3. This can further improve the contrast of the image light source formed on the screen 7. Therefore, in the embodiment of the present invention, the local Dimming Display 3 may have a Pixel Level Dimming (PLD) effect, that is, the local Dimming Display 3 may be a Pixel Level Dimming Micro Display. In other words, assuming that the local dimming display 3 has two million pixels, two million control regions Pij can control the light L passing through the control regions Pij respectively.
In view of the above, please refer to fig. 3, fig. 3 is another corresponding diagram of the local dimming display and the image display according to the embodiment of the invention, and according to the embodiment of fig. 3, the resolution of the local dimming display 3 may be smaller than the resolution of the image display 5, that is, the local dimming display 3 has a plurality of adjusting regions Pij, the image display 5 has a plurality of pixel regions Mij, and each of the adjusting regions Pij of the local dimming display 3 corresponds to at least two pixel regions Mij of the image display 5. That is, one of the control regions Pij of the local dimming type display 3 corresponds to at least one of the pixel regions Mij of the imaging display 5. Therefore, as can be seen from a comparison between fig. 3 and fig. 2, in the embodiment of fig. 3, one of the control regions Pij of the local dimming display 3 may correspond to four pixel regions Mij of the imaging display 5, however, in other embodiments, one of the control regions Pij of the local dimming display 3 may also correspond to more than four pixel regions Mij of the imaging display 5 or two to four pixel regions Mij, which is not limited in the disclosure. That is, each of the dimming control regions Pij of the local dimming display 3 may respectively correspond to one or more pixel regions Mij of the imaging display 5.
Referring to fig. 4, fig. 4 is a functional block diagram of a projection system according to an embodiment of the invention, and according to an embodiment of the invention, the projection system U may further include a control module 8, and the control module 8 may be electrically connected to the local dimming display 3 and the image display 5. In addition, the local dimming display 3 can be controlled by the control module 8 to adjust the luminous flux of the light L passing through the local dimming display 3. For example, the control module 8 may include a Video Processing Unit (VPU) (not shown) and a local Dimming Processing Unit (not shown) for selectively controlling a plurality of control areas Pij of the local Dimming display 3 to be turned on or off. In addition, the local dimming display 3 may include a local dimming display driver chip (not shown), the imaging display 5 may include an imaging display driver chip (not shown), and the control module 8 may be electrically connected to the local dimming display driver chip and the imaging display driver chip, so as to control the local dimming display 3 according to a signal. In other words, a light L generated by the light source module 1 can pass through the local dimming display 3 and the light flux of the light L is adjusted by the control module 8, and a control region Pij of the local dimming display 3 can correspond to at least one pixel region Mij of the imaging display 5. Further, the control module 8 can determine which areas need to be adjusted in brightness according to the received signal, so as to improve the contrast of the image.
In view of the above, please refer to fig. 2 and fig. 4, the manner in which the control module 8 controls the plurality of control regions Pij of the local dimming display 3 will be further illustrated. For example, the local dimming display 3 and the image display 5 may be a light combining module composed of three R (red), G (green), and B (blue) display panels, and each color has 8-bit gray scale display, so that the states of the adjusting regions Pij can satisfy the following relation: pij ═ WR*Rij+WG*Gij+WBBij, wherein WR、WGAnd WBRespectively represent the weight values of three colors, wherein WR+WG+WB1, for example: wR＝WG＝WB1/3, or other optimized ratio value combinations, and Rij, Gij, and Bij are gray scale values of the three colors. Therefore, if the contrast ratio of the local dimming display 3 is assumed to be 1000: 1, contrast ratio of imaging display 5 is 1000: 1, whereby the contrast of each pixel of the projection system U can be individually adjusted (1000)2: 1. however, it should be noted that the present invention is not limited to the above exemplary control method.
Second embodiment
First, referring to fig. 5, fig. 5 is a schematic view illustrating an optical path of a projection system according to a second embodiment of the invention. In the second embodiment, the projection system U includes a light source module 1 (for example, the light source module 1 may be UHP), a first lens group 2, a local dimming display 3, a second lens group 4, an image display 5 and a projection lens 6. In addition, the first lens group 2, the local dimming display 3, the second lens group 4, the imaging display 5 and the projection lens 6 are disposed on a predetermined optical path. Meanwhile, the local dimming display 3 may be located between the imaging display 5 and the light source module 1. It should be noted that the relationship between the local dimming display 3 and the image display 5 is similar to the previous embodiment, and is not described herein again, that is, the local dimming display 3 can be controlled by the control module 8 to adjust the luminous flux of the light L passing through the local dimming display 3.
Referring to fig. 5 again, for the second embodiment, the projection system U provided by the second embodiment can be a projection structure of a three-chip LCD. The imaging display 5 may include a first imaging display unit 51, a second imaging display unit 52 and a third imaging display unit 53. In addition, the first imaging display unit 51, the second imaging display unit 52, and the third imaging display unit 53 can be used as displays for imaging red, green, and blue colors. In the second embodiment, after the light L generated by the light source module 1 passes through the first lens group 2, the local dimming display 3 and the second lens group 4, a first projection light P1 projected onto the first imaging display unit 51, a second projection light P2 projected onto the second imaging display unit 52 and a third projection light P3 projected onto the third imaging display unit 53 are formed. Then, the first projection light P1, the second projection light P2 and the third projection light P3 are combined by a light combining unit (not numbered in the figure) and projected into the projection lens 6, thereby forming an image light source imaged on a screen 7.
As mentioned above, for example, the first lens group 2 may include at least one polarization Converter (PS-Converter, not shown) and a lens group (not shown). Meanwhile, the second lens group 4 may include at least one Dichroic Mirror (not shown), a reflector (not shown) and a lens group (not shown). It should be noted that the optical elements (such as the polarization converter and the lens group) of the first lens group 2 and the optical elements (such as the dichroic plate, the reflective mirror and the lens group) of the second lens group 4 are well known in the art and will not be described herein again.
Third embodiment
First, referring to fig. 6, fig. 6 is a schematic view illustrating an optical path of a projection system according to a third embodiment of the invention. As can be seen from a comparison between fig. 6 and fig. 5, the greatest difference between the third embodiment and the second embodiment is: the second lens group 4 and the imaging display 5 provided in the third embodiment can be different from those of the second embodiment. As for the third embodiment, the imaging display 5 may be an LCoS display. In addition, the image display 5 may include a first image display unit 51, a second image display unit 52 and a third image display unit 53. In addition, the first imaging display unit 51, the second imaging display unit 52, and the third imaging display unit 53 can be used as displays for imaging red, green, and blue colors.
Further, according to the third embodiment, the light L generated by the light source module 1 (for example, the light source module 1 may be UHP) passes through the first lens group 2, the local dimming display 3 and the second lens group 4 to form a first projected light P1 projected onto the first imaging display unit 51, a second projected light P2 projected onto the second imaging display unit 52 and a third projected light P3 projected onto the third imaging display unit 53. Then, the first imaging display unit 51, the second imaging display unit 52 and the third imaging display unit 53 project the light to a light combining unit (not numbered in the figure) for light combining. Finally, the light is projected into the projection lens 6 to form an image light source imaged on a screen 7.
It should be noted that the structural features of the light source module 1, the first lens group 2, the local dimming display 3, the second lens group 4, the imaging display 5 and the projection lens 6 in the projection system U are similar to those of the foregoing embodiments, and are not described herein again, that is, the local dimming display 3 can be controlled by the control module 8 to adjust the luminous flux of the light L passing through the local dimming display 3. Moreover, the optical elements of the first lens group 2 and the optical elements of the second lens group 4 are well known in the art, and are not described herein again.
Fourth embodiment
First, referring to fig. 7, fig. 7 is a schematic view illustrating an optical path of a projection system according to a fourth embodiment of the invention. In the fourth embodiment, the projection system U includes a light source module 1 (for example, the light source module 1 may be an LED or Laser), a first lens group 2, a local dimming display 3, a second lens group 4, an image display 5 and a projection lens 6. In addition, the first lens group 2, the local dimming display 3, the second lens group 4, the imaging display 5 and the projection lens 6 are disposed on a predetermined optical path. Meanwhile, the local dimming display 3 may be located between the imaging display 5 and the light source module 1. It should be noted that the relationship between the local dimming display 3 and the image display 5 is similar to the previous embodiment, and is not described herein again, that is, the local dimming display 3 can be controlled by the control module 8 to adjust the luminous flux of the light L passing through the local dimming display 3.
In view of the above, in the fourth embodiment, the light source module 1 may include a first light source unit 11, a second light source unit 12 and a third light source unit 13, the light L may be composed of a first light L1, a second light L2 and a third light L3 respectively generated by the first light source unit 11, the second light unit 12 and the third light source unit 13, and the first light L1, the second light L2 and the third light L3 may respectively generate red light, green light and blue light. Meanwhile, the first light L1, the second light L2 and the third light L3 can pass through the combined light of the first lens assembly 2 and are projected onto the image display 5 through the first lens assembly 2, the local dimming display 3 and the second lens assembly 4. For example, the imaging display 5 provided in the fourth embodiment may be an LCoS display, but the invention is not limited thereto. Moreover, the optical elements of the first lens group 2 and the optical elements of the second lens group 4 are well known in the art, and are not described herein again.
Fifth embodiment
First, referring to fig. 8, fig. 8 is a schematic view illustrating an optical path of a projection system according to a fifth embodiment of the invention. As can be seen from a comparison between fig. 8 and fig. 7, the biggest difference between the fifth embodiment and the fourth embodiment is: the fifth embodiment provides a first lens group 2, a second lens group 4 and an image display 5, which are different from the fourth embodiment. Further, the projection system U provided in the fifth embodiment may be a one-chip Digital Light Processing (DLP) architecture. Therefore, the imaging display 5 in the fifth embodiment can be a Digital Micromirror Device (DMD). Therefore, the first light L1, the second light L2 and the third light L3 can be projected onto the image display 5 through the first lens assembly 2, the local dimming display 3 and the second lens assembly 4. In other embodiments, the imaging display 5 may have a one-piece structure or a multi-piece structure.
It should be noted that the relationship between the local dimming display 3 and the image display 5 is similar to the previous embodiment, and is not described herein again, that is, the local dimming display 3 can be controlled by the control module 8 to adjust the luminous flux of the light L passing through the local dimming display 3. It should be noted that the optical elements of the first lens group 2 and the optical elements of the second lens group 4 are well known in the art and will not be described herein again.
One of the advantages of the projection system U of the present invention is that the projection system U of the embodiment of the present invention can utilize the technical scheme that the light L can pass through the first lens group 2, the local dimming display 3, the second lens group 4, the image display 5 and the projection lens 6 to improve the contrast of the image.
The disclosure is only a preferred embodiment of the invention, and is not intended to limit the scope of the claims, so that all technical equivalents and modifications using the contents of the specification and drawings are included in the scope of the claims.
Claims (7)
1. A projection system, characterized in that the projection system comprises:
the light source module can generate light along a preset optical path;
the first lens group is adjacently arranged beside one side of the light source module and is positioned on the preset optical path;
the local dimming display is adjacently arranged beside one side of the light source module and is positioned on the preset optical path, and the local dimming display is provided with a plurality of regulating and controlling areas;
the second lens group is adjacently arranged beside one side of the light source module and is positioned on the preset optical path;
an imaging display disposed adjacent to a side of the light source module and located on the predetermined optical path, wherein the imaging display has a plurality of pixel regions, and each of the control regions of the local dimming display corresponds to one or more of the pixel regions of the imaging display;
the projection lens is adjacently arranged beside one side of the light source module and is positioned on the preset optical path; and
the control module is electrically connected to the local dimming display and used for adjusting the luminous flux of the light rays passing through the local dimming display;
the light rays sequentially pass through the first lens group, the local dimming display, the second lens group, the imaging display and the projection lens;
the light passes through the imaging display and the projection lens to form an image light source imaged on a screen.
2. The projection system of claim 1, wherein the resolution of the local dimming display is less than or equal to the resolution of the imaging display.
3. The projection system of claim 1, wherein the local dimming display is an LCoS panel, a DLP panel, or an LCD panel.
4. The projection system of claim 1, wherein the imaging display is an LCoS panel, a DLP panel, or an LCD panel.
5. The projection system of claim 1, wherein the imaging display is of one-piece or multi-piece construction.
6. The projection system of claim 1, wherein the local dimming display is disposed over a first light source sub-imaging area and the imaging display is disposed over a second light source sub-imaging area.
7. A projection system, characterized in that the projection system comprises: the display device comprises a light source module, a first lens group, a local dimming display, a second lens group, an imaging display, a projection lens and a control module, wherein the control module is electrically connected with the local dimming display and the imaging display;
the first lens group, the local dimming display, the second lens group, the imaging display and the projection lens are arranged on a preset optical path;
wherein, a light generated by the light source module sequentially passes through the first lens group, the local dimming display, the second lens group, the imaging display and the projection lens to form an image light source;
the light rays generated by the light source module are regulated and controlled by the local dimming type display so as to adjust the luminous flux of the light rays;
the local dimming display is provided with a plurality of regulating and controlling areas, the imaging display is provided with a plurality of pixel areas, and the regulating and controlling areas of the local dimming display respectively correspond to one or more pixel areas of the imaging display.
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| CN101943845A (en) * | 2009-07-07 | 2011-01-12 | 红蝶科技(深圳)有限公司 | Efficient miniature projection optical engine |
| CN104797977A (en) * | 2012-11-20 | 2015-07-22 | 日立麦克赛尔株式会社 | Projection-type video-image-displaying device |
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