TW201401875A - Projection system and image adjustment method thereof - Google Patents

Abstract

A projection system and an image adjusting method thereof are provided. The projection system includes a dynamic projection screen, a projection device and a control unit. The dynamic projection screen dynamically reflects an image beam, so as to generate a reflected beam. The projection device projects the image beam according to an image data. The control unit adjusts characteristics of the reflected beam by controlling the dynamic projection screen according to a screen control signal.

Description

Projection system and image adjustment method thereof

The present invention relates to a projection system and an image adjustment method thereof, and more particularly to a projection system having a dynamic projection screen and an image adjustment method thereof.

The projection device is a display device for generating a large-sized screen. The imaging principle of the projection device is to convert the illumination beam generated by the light source into an image beam by a light valve, and then project the image beam through the lens onto the screen to form an image.

In a general use environment, the image projected by the projection device is mixed into the ambient light, and the brightness of the detail of the dark portion of the image is increased, thereby causing a sharp drop in visual contrast. In the prior art, there are many ways to improve the contrast. Taking the liquid crystal display projection device as an example, the problem of dark light leakage can be improved by reducing the aperture ratio of the liquid crystal display panel, thereby increasing the liquid crystal display projection device. Contrast. Taking a digital light processing (DLP) projection device as an example, the contrast of the projected image of the digital optical processing projection device can be increased by improving the surface roughness of the digital micro mirror device (DMD). . However, the image contrast enhanced by the above method cannot effectively flatten the effect of ambient light.

The invention provides a projection system and an image adjustment method thereof, which can reduce interference of ambient light and effectively improve image contrast.

The invention provides a projection system comprising a dynamic projection screen, a projection device and a control unit. The dynamic projection screen is used to dynamically reflect an image beam to generate a reflected beam. The projection device projects the image beam according to the image data. The control unit is configured in the dynamic projection screen or the projection device, and controls the dynamic projection screen according to the screen control signal to adjust the characteristics of the reflected beam.

In an embodiment of the invention, the screen control signal includes at least one of image data and an adjustment signal, wherein the adjustment signal is output by the projection device according to a user setting.

In an embodiment of the invention, the projection device comprises a projection unit and a control unit. The projection unit is used to project an image beam. The control unit is coupled to the projection unit, controls the projection unit to project the image beam according to the image data, and controls the dynamic projection screen to reflect the image beam according to the image data.

In an embodiment of the invention, the dynamic projection screen comprises a dynamic screen unit and a screen control unit. The screen control unit is coupled to the dynamic screen unit and the control unit, and the screen control unit controls the dynamic screen unit to adjust the characteristics of the reflected beam by the control unit.

In an embodiment of the invention, the dynamic screen unit includes an array of reflective elements having a plurality of reflective elements, and the control unit controls the screen control unit to adjust the reflective elements according to the image data and the characteristics of an ambient light. The angle of rotation of the piece.

In an embodiment of the present invention, the projection system further includes a detecting unit coupled to the control unit for detecting a position of the user, and the control unit controls the screen control unit to adjust the reflection according to the position of the user. The characteristics of the beam.

In an embodiment of the present invention, the control unit further controls the screen control unit according to the image data, so that the screen control unit controls the dynamic screen unit to display an image frame on the projected side.

In an embodiment of the present invention, the control unit further controls one of the image content, the hue, and the grayscale value of the image frame displayed by the dynamic screen unit according to the image data control unit to control the screen control unit.

In an embodiment of the present invention, the projection system further includes a light detecting unit coupled to the control unit to detect the characteristics of the ambient light, and the control unit further controls the screen control unit to adjust the dynamic screen according to the characteristics of the ambient light. One or a combination of image content, hue, and grayscale values of the image displayed by the unit.

The invention also provides an image adjustment method for a projection system. The projection system comprises a dynamic projection screen, and the image adjustment method of the projection system comprises the following steps. The image beam is projected onto the dynamic projection screen according to an image data to generate a reflected beam. Adjust the dynamic projection screen to adjust the characteristics of the reflected beam according to the image data or user settings.

In an embodiment of the invention, the dynamic projection screen comprises an array of reflective elements having a plurality of reflective elements, and the step of adjusting the characteristics of the reflected light beam further comprises the following steps. Detect the characteristics of ambient light. Image based The data and the characteristics of the ambient light adjust the angle of rotation of each reflective element.

In an embodiment of the present invention, the image adjustment method of the above projection system further includes the following steps. Detect the location of the user. The characteristics of the reflected beam are adjusted according to the image data, the characteristics of the ambient light, and the position of the user.

In an embodiment of the present invention, the image adjustment method of the above projection system further includes the following steps. Detect the location of the user. The angle of rotation of each of the reflective elements is adjusted according to the position of the user.

In an embodiment of the invention, the step of adjusting the characteristics of the reflected beam comprises the following steps. The dynamic projection screen is controlled according to the image data to display an image frame on the projected side. Adjusting one or a combination of image content, hue, and grayscale value of the image frame displayed on the dynamic projection screen according to the image data.

In an embodiment of the invention, the image adjustment method further includes the following steps. Detect the characteristics of ambient light. Adjusting one or a combination of image content, hue, and grayscale value of the image screen displayed on the dynamic projection screen according to the characteristics of the ambient light.

In an embodiment of the invention, the image content of the image frame is the same as the image content of the image beam.

Based on the above, the present invention controls the dynamic projection screen to adjust the characteristics of the reflected beam according to the image data and the ambient light characteristics, so as to reduce the interference of the ambient light and effectively improve the image contrast.

The above described features and advantages of the present invention will be more apparent from the following description.

1A and 1B are schematic diagrams showing a projection system according to an embodiment of the present invention. Referring to FIG. 1A and FIG. 1B simultaneously, the projection system 100 includes a dynamic projection screen 102, a projection device 104, and a control unit 106. The coupling between the dynamic projection screen 102 and the projection device 104 may be a wired connection or a wireless connection, and the control unit 106 may be disposed on the projection device 104 (as shown in FIG. 1A) or the dynamic projection screen 102 (as shown in FIG. 1B). in. The projection device 104 is configured to project an image beam onto the dynamic projection screen 102 according to an image data D1, and the dynamic projection screen 102 is configured to dynamically reflect the image beam to generate a reflected beam. In addition, the control unit 106 controls the dynamic projection screen 102 according to a screen control signal to adjust the characteristics of the reflected beam, for example, adjusting the optical path or color tone of the reflected beam to improve the image contrast. The screen control signal includes, for example, the image data D1 and the adjustment signal S1. At least one of the adjustment signals S1 is a signal output by the projection device 104 according to a user setting. By controlling the dynamic projection screen 102 to adjust the optical path of the reflected beam, the ambient light can be reflected to a position other than the user's viewing position to prevent the user from receiving ambient light and reducing the contrast of the viewed image. By adjusting the hue of the reflected beam, the projected image can maintain the hue of the original image without being affected by the ambient light hue, and can also enhance or reduce the brightness of the projected image.

2A is a schematic diagram of a projection system according to another embodiment of the present invention. Referring to FIG. 2A , in detail, the dynamic projection screen 102 in the projection system 200 of the present embodiment may include a dynamic screen unit 202 and a screen control unit 204 . Projection device 104 then includes a control unit 106. its The medium dynamic screen unit 202 can be implemented, for example, in an electronic paper related technology (eg, sipix, mirasol display technology), an electrowetting technology, or a Digital Micro-mirror device (DMD). The screen control unit 204 is coupled to the dynamic screen unit 202 and the control unit 106. The coupling between the screen control unit 204 and the control unit 106 can be a wired connection or a wireless connection.

The control unit 106 controls the screen control unit 204 in accordance with the image data D1 to cause the screen control unit 204 to adjust the characteristics of the reflected light beam. For example, the dynamic screen unit 202 can include an array of reflective elements (not shown) having a plurality of reflective elements (eg, digital micromirror devices). The control unit 106 adjusts the screen control unit 102 according to the image data D1 and the ambient light. The angle of rotation of each of the reflective elements to adjust the optical path of the reflected beam. In addition, the control unit 106 can also adjust the rotation angle of each reflective element to adjust the optical path of the reflected beam by adjusting the control screen control unit 102 according to the user's setting (ie, according to the adjustment signal S1).

As shown in the schematic diagram of the reflected light path of the ambient light in FIG. 3A and FIG. 3B, assuming that the ambient light is incident on the right side of the dynamic screen unit 202, the control unit 106 can direct the ambient light to a position other than the user's viewing position according to the position of the user. In order to prevent the user from receiving the reflected beam of the reflected beam and the ambient light from the projection beam at the same time, the contrast of the projected picture is lowered. As shown in FIG. 3A, when the user is located on the left side of the dynamic screen unit 202, the control unit 106 controls the dynamic screen unit 202 to reflect the ambient light back to its incident direction, that is, the right side of the dynamic screen unit 202, through the screen control unit 204. And when the user is located on the right side of the dynamic screen unit 202, the control list Element 106 controls dynamic screen unit 202 to reflect ambient light to the left side of dynamic screen unit 202 via screen control unit 204.

In addition, the dynamic screen unit 202 can reflect the reflected light beam of the projected beam to the viewing position of the user, in addition to reflecting the ambient light to avoid the user. As shown in FIG. 3C, the left half of FIG. 3C is a schematic diagram of adjusting the optical path of the reflected beam, and an adjustment diagram of the projection picture viewed by the user in the right half. As can be seen from FIG. 3C, after the reflected beam of the projected beam is adjusted from the optical path A1 to the optical path A2, the image quality and contrast of the projected picture viewed by the user are significantly improved.

It should be noted that in other embodiments, the control unit 106 is not limited to having to be configured in the projection device 104. As shown in FIG. 2B, a schematic diagram of a projection system according to another embodiment of the present invention, the control unit 106 can also be configured in the dynamic projection screen 102. Since the control unit 106 controls the screen control unit 102 to adjust the characteristics of the adjusted reflected light beam, it has been described in the above embodiments, and thus will not be described herein.

4A is a schematic diagram of a projection system according to another embodiment of the present invention. Referring to FIG. 4, the projection system 400 of the present embodiment is different from the projection system 200 of FIG. 2 in that the projection system 400 further includes a detecting unit 402 coupled to the control unit 106 for detecting a user's position. In this way, the control unit 106 can adjust the rotation angle of the reflective component through the adjustment screen control unit at any time according to the position of the user detected by the detecting unit 402, thereby avoiding the ambient light from affecting the projection effect, and can project the projection. The light beam is reflected to the user's position to enhance the image quality and contrast of the projected image viewed by the user.

As previously mentioned, in other embodiments, control unit 106 is not limited to having to be configured in projection device 104. As shown in FIG. 4B, the control unit 106 can also be configured in the dynamic projection screen 102, and the detection unit 402 is also connected to the dynamic projection screen 102 along with the control unit 106.

In some embodiments, the dynamic screen unit 202 of the embodiment of FIG. 2 can be, for example, a display screen constructed using electronic paper related technologies (eg, sipix, mirasol display technology), electrowetting technology. The control unit 106 can control the screen control unit 204 according to the image data D1, and cause the screen control unit 204 to control the dynamic screen unit 202 to display an image screen on the projected side, and adjust the dynamic screen according to the image data D1 and the ambient light control screen control unit 204. One or a combination of image content, hue, and grayscale values of the image frame displayed by unit 202. For example, the dynamic screen unit 202 can be controlled to display different colors on the projected side to change the hue of the reflected beam, to enhance or attenuate the light intensity of the reflected beam. For example, when the ambient light is yellowish, it means that the yellow light source is too much. At this time, the image screen displayed by the dynamic screen unit 202 can be adjusted to blue to absorb more yellow light. As shown in the image screen adjustment diagram of the dynamic screen unit of FIG. 5, the left half of FIG. 5 is the image screen of the dynamic screen unit 202, and the right half is the projection unit 104 for projecting the dynamic screen unit 202. The projected projection picture. As shown in FIG. 5, after the dynamic screen unit 202 adjusts the image screen displayed by the screen from white to blue, the image quality and contrast of the projected screen viewed by the user are greatly improved.

In addition, when the scene of the image data D1 is a bright scene, the control unit The dynamic screen unit 202 can also be controlled by the screen control unit 204 according to the image data D1, and the image screen displayed by the dynamic screen unit 202 can be adjusted to white to reduce the light absorption of the dynamic screen unit 202 and enhance the light intensity of the reflected light beam. The brightness of the projected picture is enhanced. Conversely, if the scene of the image data D1 is a dark scene, the screen can be adjusted to a dark color to enhance the light absorption of the dynamic screen unit 202, reduce the light intensity of the reflected beam, and reduce the brightness of the projected image. The scene of the image data D1 is bright or dark, and can be judged by analyzing the brightness histogram of the image data D1.

FIG. 6A is a schematic diagram of a projection system according to another embodiment of the present invention. Referring to FIG. 6A, the projection system 600 of the present embodiment is different from the projection system 200 of FIG. 2 in that the projection system 600 further includes a light detecting unit 602 coupled to the control unit 106. The characteristics of the ambient light can be obtained by detecting the ambient light characteristics around the projection system 600 by the light detecting unit 602. Thus, the control unit 106 can control the screen control unit 204 to adjust the dynamic screen unit 202 according to the characteristics of the ambient light to change the characteristics of the reflected beam, thereby improving the image quality and contrast of the projected picture viewed by the viewer. The details in which the control unit 106 controls the screen control unit 204 to adjust the projected picture according to the characteristics of the ambient light have been described in the above embodiments, and thus will not be described again.

As previously mentioned, in other embodiments, control unit 106 is not limited to having to be configured in projection device 104. As shown in FIG. 6B, a schematic diagram of a projection system according to another embodiment of the present invention, the control unit 106 can also be disposed in the dynamic projection screen 102, and the light detecting unit 602 is also connected to the dynamic projection screen 102 along with the control unit 106.

It should be noted that the manner in which the dynamic screen unit 202 adjusts the displayed image frame does not limit the color adjustment of the full screen, and may also be adjusted for a local area. Alternatively, the image data D1 can be dynamically switched. For example, the image frame displayed by the dynamic screen unit 202 can be the same as the image content of the projected image, so that the image details in the projected image can be enhanced. However, since the resolution of the image content projected by the projection device 104 may be different from the resolution and grayscale value of the image frame that can be displayed by the dynamic screen unit 202, in this case, the control unit 106 must first perform image on the image data D1. The image data D1 is converted into image data suitable for the resolution and grayscale value of the dynamic screen unit 202 to drive the dynamic screen unit 202 to display an image image corresponding to the image beam.

As shown in the schematic diagram of the image screen adjustment of the dynamic screen unit of FIG. 7, the left half of FIG. 7 is the image screen of the dynamic screen unit 202, and the right half is the projection of the dynamic screen unit 202 by the projection apparatus 104. The projected image that you have seen. As can be seen from FIG. 7 , by taking different settings according to different regions of the image data displayed by the dynamic screen unit 202 according to the image data D1, the image quality and contrast of the projected image can be improved, and the projected image is closer to the original image. The image content of the data D1.

Further, the control unit 106 can control the dynamic screen unit 202 through the screen control unit 204 to enhance the grayscale values of a particular color (eg, red) or all colors. For example, it is assumed that the grayscale value of the projected image may be 0 to 255, and the grayscale value of the image of the dynamic screen unit 202 may only be 0-15. When the grayscale value of the red pixel of the projected picture is greater than 200, the control unit 106 can control the dynamic screen unit according to the image data D1. 202 adjusts the grayscale value of the corresponding red pixel in the image picture to a maximum value of 15. Or, when the grayscale value of any pixel (including red, green, and blue pixels) of the projected picture is greater than 200, the grayscale value of the corresponding pixel in the image displayed by the dynamic screen unit 202 is Adjust to a maximum of 15.

It should be noted that the adjustment of the grayscale value of this embodiment is only an exemplary embodiment, and is not limited thereto. For example, the grayscale value of the pixel corresponding to the image screen displayed by the dynamic screen unit 202 may be adjusted to a specific value (for example, 12) for the pixel whose grayscale value is greater than 100 in the projection screen. In addition, in addition to adjusting the grayscale value of the pixel in the image screen displayed by the dynamic screen unit 202 corresponding to the grayscale value of the pixel in the projected image, all the paintings in the image image displayed by the dynamic screen unit 202 may be directly directed. Adjust the grayscale value, for example, to increase or decrease the grayscale value as a whole.

In addition, in other embodiments, the projection system 200 can also include a detection unit 402 and a light detecting unit 602, as shown in FIG. 8A. The projection system 800 further includes a detecting unit 402 and a light detecting unit 602, which are respectively coupled to the control unit 106, compared to the projection system 200 of FIG. In this way, the control unit 106 can reflect the projection angle of the reflective component to the position of the user at any time by adjusting the rotation angle of the reflective component according to the position of the user detected by the detection unit 402. In addition, the ambient light can be avoided at the same time, and the ambient light is directed to a position other than the user's viewing position, so as to prevent the user from receiving the reflected light beam from the ambient light at the same time, thereby improving the image quality of the projected image viewed by the messenger and Contrast. The control unit 106 controls the screen control unit 204 to adjust the reflection according to the characteristics of the ambient light and the user position. The details of the light beam have been described in the above embodiments, and therefore will not be described again.

As previously mentioned, in other embodiments, control unit 106 is not limited to having to be configured in projection device 104. As shown in FIG. 8B, the control unit 106 can also be configured in the dynamic projection screen 102, and the detecting unit 402 and the light detecting unit 602 are also connected to the control unit 106. Dynamic projection screen 102.

FIG. 9 is a flow chart of an image adjustment method of a projection system according to an embodiment of the present invention, wherein the projection system includes a dynamic projection screen. Referring to FIG. 9, in summary, the image adjustment method of the projection system may include the following steps. First, the image beam is projected onto the dynamic projection screen according to an image data to generate a reflected beam (step S902). Then, the characteristics of the reflected beam are adjusted according to the image data or the user setting control dynamic projection screen (step S904) to improve the image contrast. The characteristic of the reflected beam may be, for example, the optical path or hue of the reflected beam, and the like. For example, the dynamic projection screen may include an array of reflective elements having a plurality of reflective elements (eg, digital micromirror devices), and the optical path of the reflected beam may be adjusted by adjusting the rotation angle of each reflective element according to the image data. Improve the picture quality and contrast of the projected picture.

In addition, the dynamic projection screen can be used to adjust the characteristics of the optical path of the reflected beam, so that the optical path of the reflected beam can be adjusted corresponding to the position of the user, so that the user has the best viewing quality. 10 is a flowchart of a method for adjusting an image of a projection system according to another embodiment of the present invention. The image adjustment method of the projection system of the present embodiment is different from the image adjustment method of the projection system of FIG. 9 in that the present embodiment In step S904 of the example, according to the image data control The dynamic projection screen adjusts the characteristics of the reflected beam to include the following steps. After the image beam is projected onto the dynamic projection screen according to the image data, the characteristics of the ambient light are detected (step S1002). Then, the rotation angle of each reflective element is adjusted according to the image data and the characteristics of the ambient light (step S1004) to prevent the ambient light from affecting the image quality and contrast of the projected image.

11 is a flowchart of a method for adjusting an image of a projection system according to another embodiment of the present invention. The image adjustment method of the projection system of the present embodiment is different from the image adjustment method of the projection system of FIG. 9 in that the present embodiment In step S904, controlling the dynamic projection screen according to the image data to adjust the characteristics of the reflected beam includes the following steps. After the image beam is projected onto the dynamic projection screen according to the image data, the location of the user is detected (step S1102). Then, the rotation angle of each of the reflecting elements is adjusted in accordance with the image data and the position of the user (step S1104). In this way, the angle of the reflected beam can be changed according to the position of the user, so that the user has better viewing quality.

It should be noted that in some embodiments, the adjustment of the projected picture may also be performed in combination with detecting ambient light characteristics and the location of the user. FIG. 12 is a flowchart of a method for adjusting an image of a projection system according to another embodiment of the present invention. The image adjustment method of the projection system of the present embodiment is different from the image adjustment method of the projection system of FIG. 9 in that the present embodiment In step S904, controlling the dynamic projection screen according to the image data to adjust the characteristics of the reflected beam includes the following steps. First, the characteristics of the ambient light are detected (step S1202). In response, the location of the user is detected (step S1204). Then, based on the image data, the characteristics of the ambient light, and the position of the user The angle of rotation of each of the reflecting elements (step S1206). In addition to avoiding the ambient light affecting the image quality and contrast of the projected image, the angle of the reflected beam can be changed according to the position of the user, so that the user has better viewing quality.

In addition, the dynamic projection screen can also be implemented, for example, by electronic paper related technology, electrowetting technology. 13 is a flowchart of a method for adjusting an image of a projection system according to another embodiment of the present invention. The image adjustment method of the projection system of the present embodiment is different from the image adjustment method of the projection system of FIG. 9 in that the present embodiment In step S904, controlling the dynamic projection screen according to the image data to adjust the characteristics of the reflected beam includes the following steps. First, the dynamic projection screen is controlled to display an image screen on the projected side according to the image data (step S1302). Then, one or a combination of the image content, the hue and the grayscale value of the image frame displayed on the dynamic projection screen is adjusted according to the image data (step S1304) to change the hue of the reflected beam, and to enhance or attenuate the light intensity of the reflected beam. For example, the image content of the image frame can be the same as the image content of the image beam.

In some embodiments, the image displayed on the dynamic projection screen may also be adjusted according to ambient light characteristics. 14 is a flowchart of a method for adjusting an image of a projection system according to another embodiment of the present invention. The image adjustment method of the projection system of the present embodiment is different from the image adjustment method of the projection system of FIG. 9 in that the present embodiment In step S904, controlling the dynamic projection screen according to the image data to adjust the characteristics of the reflected beam includes the following steps. First, the characteristics of an ambient light are detected (step S1402). Then, the dynamic projection screen is controlled to display an image screen on the projected side according to the image data (step S1404). Finally, the image content, hue and grayscale value of the image displayed on the dynamic projection screen are adjusted according to the image data and the characteristics of the ambient light. One of them or a combination thereof (step S1406). By adjusting the image displayed on the dynamic projection screen by further considering the factors of the ambient light characteristics, the user can have better viewing quality.

In summary, the present invention controls the dynamic projection screen to adjust the characteristics of the reflected beam according to the image data, the ambient light characteristics, and the viewing position of the user, such as the optical path, color tone, and the like of the reflected beam. In addition to adjusting the parameters of the projection picture (such as grayscale value, brightness, etc.) according to the image data to the most suitable setting value, the ambient light interference can be reduced, and the image contrast can be effectively improved, so that the user has excellent performance. The quality of the viewing.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the invention, and any one of ordinary skill in the art can make some modifications and refinements without departing from the spirit and scope of the invention. The scope of the invention is defined by the scope of the appended claims.

100, 200, 400, 600‧‧‧ projection system

102‧‧‧Dynamic projection screen

104‧‧‧Projection device

106‧‧‧Control unit

D1‧‧‧Image data

202‧‧‧Dynamic screen unit

204‧‧‧Screen Control Unit

402‧‧‧Detection unit

602‧‧‧Light detection unit

S1‧‧‧ adjustment signal

S902~S904, S1002~S1004, S1102~S1104, S1202~S1206, S1302~S1304, S1402~S1406‧‧‧Photographing method steps of projection system

1A and 1B are schematic diagrams showing a projection system according to an embodiment of the present invention.

2A and 2B are schematic diagrams showing a projection system according to an embodiment of the present invention.

3A and 3B are schematic diagrams showing reflected light paths of ambient light according to an embodiment of the invention.

FIG. 3C is a schematic diagram showing the adjustment of the optical path of the reflected beam and the projection picture according to an embodiment of the invention.

4A and 4B are schematic diagrams showing a projection system according to an embodiment of the present invention.

FIG. 5 is a schematic diagram of image frame adjustment of a dynamic screen unit according to an embodiment of the invention.

6A and 6B are schematic diagrams showing a projection system according to an embodiment of the present invention.

FIG. 7 is a schematic diagram of image frame adjustment of a dynamic screen unit according to another embodiment of the present invention.

8A and 8B are schematic diagrams showing a projection system according to an embodiment of the present invention.

9 to 14 are flowcharts showing an image adjustment method of a projection system according to an embodiment of the present invention.

100‧‧‧Projection system

102‧‧‧Dynamic projection screen

104‧‧‧Projection device

106‧‧‧Control unit

D1‧‧‧Image data

S1‧‧‧ adjustment signal

Claims (16)

A projection system comprising: a dynamic projection screen for dynamically reflecting an image beam to generate a reflected beam; a projection device for projecting the image beam according to an image data; and a control unit disposed on the dynamic projection screen or the projection In the device, the dynamic projection screen is controlled according to a screen control signal to adjust the characteristics of the reflected beam. The projection system of claim 1, wherein the screen control signal comprises at least one of the image data and an adjustment signal, wherein the adjustment signal is output by the projection device according to a user setting. The projection system of claim 2, wherein the dynamic projection screen comprises: a dynamic screen unit; and a screen control unit coupled to the dynamic screen unit and the control unit, controlled by the control unit The dynamic screen unit adjusts the characteristics of the reflected beam. The projection system of claim 3, wherein the dynamic screen unit comprises: an array of reflective elements having a plurality of reflective elements, the control unit controlling the adjustment of the screen control unit according to the image data and characteristics of an ambient light The angle of rotation of each of the reflective elements. The projection system of claim 3, further comprising: a detecting unit coupled to the control unit to detect a position of the user, the control unit further controlling the screen control unit according to the position of the user Adjust the characteristics of the reflected beam. The projection system of claim 3, wherein the control unit further controls the screen control unit according to the image data, so that the screen control unit controls the dynamic screen unit to display an image frame on the projected side. The projection system of claim 6, wherein the control unit further controls the screen control unit to adjust one of image content, hue and grayscale value of the image displayed by the dynamic screen unit according to the image data. Or a combination thereof. The projection system of claim 3, further comprising: a light detecting unit coupled to the control unit to detect the characteristic of the ambient light, the control unit further controlling the screen control according to the characteristic of the ambient light The unit adjusts one or a combination of image content, hue and grayscale value of one of the image frames displayed by the dynamic screen unit. The projection system of claim 6, wherein the image content of the image frame is the same as the image content of the image beam. An image adjustment method for a projection system, the projection system comprising: a dynamic projection screen, comprising: projecting the image beam to the dynamic projection screen according to an image data to generate a reflected beam; and controlling the image according to the image data or user setting The dynamic projection screen adjusts the characteristics of the reflected beam. The image adjustment method of the projection system of claim 10, wherein the dynamic projection screen comprises an array of reflective elements having a plurality of reflective elements, and the step of adjusting the characteristics of the reflected light beam further comprises: detecting an environment The characteristics of light; adjust the reflection according to the image data and the characteristics of the ambient light The angle of rotation of the component. The image adjustment method of the projection system of claim 10, further comprising: detecting a location of the user; and adjusting the reflected beam according to the image data, the characteristic of the ambient light, and the position of the user. Characteristics. The image adjustment method of the projection system of claim 10, further comprising: detecting a position of the user; and adjusting a rotation angle of each of the reflective elements according to the position of the user. The image adjustment method of the projection system of claim 10, wherein the adjusting the characteristic of the reflected light beam comprises: controlling the dynamic projection screen to display an image image on the projected side according to the image data; and according to the image The data adjusts one or a combination of image content, hue, and grayscale value of the image frame displayed on the dynamic projection screen. The image adjustment method of the projection system of claim 10, further comprising: detecting a characteristic of an ambient light; and adjusting an image content of the image displayed by the dynamic projection screen according to the characteristic of the ambient light, One or a combination of hue and grayscale values. The image adjustment method of the projection system of claim 14, wherein the image content of the image frame is the same as the image content of the image beam.