CN101598887A - projection device - Google Patents

Abstract

The invention provides a projection device for projecting an image on an object, which comprises a sensing unit, a control unit, a light source module and an optical processing unit. The sensing unit generates a sensing signal. The control unit is coupled with the sensing unit and generates a control signal according to the sensing signal. The light source module is used for outputting multicolor light and adjusting the outputted multicolor light according to the control signal. The optical processing unit receives the polychromatic light output by the light source module to generate a projection image.

Description

projection device

technical field

The present invention relates to a projection device, in particular, the projection device adjusts the projection image according to different external environment light sources or according to different projection areas.

Background technique

In the known technology, the optical mechanism of the projection system is mostly fixed, and even if it can be changed, it is limited. There are several preset modes, which cannot meet the actual various projection environments. In particular, when projecting in a high-brightness environment, the effect of the image is obviously lower than that in a dark room. In addition, the known projection system cannot dynamically adjust the white balance of the image.

In view of this, there is a need for a projection device that can automatically adjust with the external environment or the image of the projected area. In addition to adjusting the brightness, it can also adjust the white balance.

Contents of the invention

One aspect of the present invention is to provide a projection device, which utilizes a sensing signal generated by a sensing device, and then provides the sensing signal to a control unit for controlling a light source module, so as to generate a projected image through an optical processing unit.

Another aspect of the present invention is to provide a projection device, which utilizes the sensing signal generated by the sensing device, and then provides the sensing signal to the control unit to control the light source module and adjust the polychromatic light output by the light source module, so as to Further adjust the white balance or light intensity of the projected image.

Another aspect of the present invention is to provide a projection device, which uses a light sensor to detect the sensing signal generated by the light intensity or light chromaticity of the external environment, and provides a control unit to control the light source module to adjust the output of the light source module. White balance or light intensity.

In one embodiment, a projection device is provided for generating a projection image on an object, and the projection device includes a sensing unit, a control unit, a light source module, and an optical processing unit. The sensing unit generates a sensing signal. The control unit is coupled with the sensing unit, and generates a control signal according to the sensing signal. The light source module is used for outputting polychromatic light, and the output polychromatic light is adjusted according to the control signal. The optical processing unit receives the polychromatic light output by the light source module to generate a projected image. Wherein, the optical processing unit can further adjust the white balance or light intensity of the projected image according to the control signal.

The present invention also provides a method for projecting an image for generating a projected image on an object, the method comprising: generating a sensing signal; generating a control signal in response to the sensing signal; adjusting the output polychromatic light according to the control signal; and The output polychromatic light is received to generate the projected image.

The present invention also provides an electronic device with the above-mentioned projection device, comprising: a projection device for generating a projected image on an object, including: a sensing unit for generating a sensing signal; a control unit coupled with the sensing unit, And according to the sensing signal, a control signal is generated; a light source module is used to output polychromatic light, and the output polychromatic light is adjusted according to the control signal; and an optical processing unit receives the polychromatic light output by the light source module to generate the projection image; wherein the light source module adjusts the polychromatic light output by the light source module according to the control signal, so as to further adjust the white balance or light intensity of the projected image.

The purpose, embodiments, features, and advantages of the present invention will become clearer with the following description and illustration of preferred embodiments.

Description of drawings

1 is a block diagram of a projection device according to an embodiment of the present invention;

2 is a schematic diagram illustrating a projection device according to an embodiment of the present invention;

3 is a schematic diagram illustrating a projection device of an embodiment of the present invention;

4 is a schematic diagram illustrating a light source module of an embodiment of the present invention;

5 is a schematic diagram illustrating a light source module of an embodiment of the present invention; and

FIG. 6 is a flowchart illustrating a method of projecting an image according to an embodiment of the present invention.

[Description of main component labels]

Projection device 100, 200, 300

Sensing unit 102, 202, 302

Sensing signal SS

Control unit 104, 204, 304

Control signal CS

Light source module 106, 206, 306, 400, 500

Red, green and blue light CL

Optical processing unit 108, 208, 308

projected image PI

External ambient light source EO

Lighting unit 402, 502

Color wheel 403

Shading unit 404

White Light WL

Detailed ways

The invention discloses a projection device for generating projection images on objects. In order to make the description of the present invention more detailed and complete, reference may be made to the following description together with the diagrams of FIGS. 1 to 5 .

Referring to FIG. 1 , it is a block diagram of a projection apparatus 100 according to an embodiment of the present invention. For example, besides being a single projector, the projection device 100 can also be integrated into a personal computer, a notebook computer, a personal digital assistant, a mobile phone or a mobile audio-visual device.

The projection device 100 includes a sensing unit 102 , a control unit 104 , a light source module 106 and an optical processing unit 108 . Wherein, the sensing unit 102 generates the sensing signal SS. Preferably, the sensing unit 102 is an image capture device (such as a CCD camera or a CMOS camera), so as to capture and record the projected image PI projected on the object (such as a screen, not shown) by the projection device 100, and then according to the captured The captured image generates a sensing signal SS; in another embodiment, the sensing unit 102 is a light sensor to sense the light intensity or light chromaticity of the external ambient light EO to generate the sensing signal SS.

The sensing unit 102 is coupled to the control unit 104 and generates a control signal CS according to the sensing signal SS. Preferably, the control unit 104 is implemented by means of an integrated circuit. For example, when the sensing unit 102 is a light sensor, and the sensing signal SS indicates that the light intensity of the external ambient light EO is too strong, the control unit 104 sends a control signal CS to increase the brightness. Or when the chromaticity of the external ambient light EO deviates from a certain color, the control unit 104 sends a control signal CS for correcting the color, so that the projected image PI is correctly projected.

The light source module 106 is for outputting polychromatic light CL, and adjusts the output polychromatic light according to the control signal CS. Preferably, the light source module 106 can be composed of light emitting diodes or laser diodes to output polychromatic light. If it is desired to increase the light intensity of the output polychromatic light, the light source module 106 may include more than a single light emitting diode or laser diode, and may also be composed of multiple light emitting diodes or multiple laser diodes.

The optical processing unit 108 receives the polychromatic light CL output by the light source module 106 to generate a projected image. Preferably, the optical processing unit 108 can use a digital micromirror device (DMD) developed by Texas Instruments or a liquid crystal on silicon (LCoS) method to generate a projected image. Preferably, in addition to controlling the light source module 106 by the control signal CS, the optical processing unit 108 can also further adjust the white balance or light intensity of the projected image PI according to the control signal CS.

Referring to FIG. 2 , it is a schematic diagram illustrating a projection device 200 according to an embodiment of the present invention. Referring to the description of FIG. 1 together, when the sensing unit 202 is an image capture device, it can capture the projection image PI projected by the projection device 200 on the screen or the wall, so that the sensing unit 202 can use the captured projection image Get the color or brightness information of the image in PI. Such information can be provided to the control unit 204 through the sensing signal SS to determine whether the color of the projected image PI presented on the screen or the wall is the correct color to be presented by the projection device 200 .

For example, the projection device 200 originally intends to present a pure white image PI, but if the pure white image PI is projected on a yellow ambient light source, the image PI viewed by the user tends to be yellowish rather than pure white. The control unit 204 then analyzes and processes the sensing signal SS to generate a control signal CS for adjusting the output color information. The control signal CS is input to the light source module 206 to adjust the specific ratio of the polychromatic light CL provided. For example, the projection device 200 projects a projected image PI with the correct color according to the settings. However, when the projected image PI is under a yellowish ambient light source At this time, the actual color of the projected image PI on the display screen or the wall is detected to be yellowish by the sensing unit 202, and correspondingly sends a sensing signal SS to the control unit 204; the control unit 204 then sends a control signal CS to the light source module 206. Increase the proportion of medium-blue light, so that the projected image PI that was originally yellowish is displayed as the projected image PI with the correct color. The aforementioned compensation correction is generally also referred to as image white balance correction. In addition, when the brightness of the projected image PI is too high, the details of the image content of the projected image PI will be difficult to discern. Therefore, the intensity of the light source module 206 is adjusted by the control unit 204 to achieve correction of the image brightness.

Referring to FIG. 3 , it is a schematic diagram illustrating a projection device 300 according to an embodiment of the present invention. Referring to the description of FIG. 1 together, when the sensing unit 302 is a light sensor, it can detect the light intensity and light chromaticity of the external ambient light EO, and generate a sensing signal SS. For example, the light sensor can be a photometer or a chromaticity count. Such light intensity or light chromaticity information can be provided to the control unit 304 through the sensing signal SS to determine whether the light source module 306 needs to increase/decrease the intensity of the light source, or change the color of the light source, so that the projection device 300 generates a signal for the user. The projected image PI can be viewed clearly and comfortably without being too intense, too faint, or projected image PI of incorrect color, etc.

The sensing signal SS from the sensing unit 302 is provided to the control unit 304 to analyze and process the light intensity or chromaticity of the external environment, and generate a control signal CS for adjusting the output light intensity or chromaticity message. This control signal CS is provided to the light source module 306 to adjust the light intensity or light chromaticity of the provided light source module 306. For example, in terms of light intensity sensing information, a higher current is provided to the light source module 306 to generate higher The light intensity can be used to compensate for the insufficient brightness of the projected image, or the projected light intensity can be reduced to save power and avoid excessively bright images from irritating the user's eyes.

Referring to FIG. 4 , it is a schematic diagram illustrating a light source module 400 according to an embodiment of the present invention. The light source module 400 includes a light emitting unit 402 and a color wheel 403 . The light emitting unit 402 is used to generate white light, such as directly using a high pressure halogen lamp (UHP) to generate a light source. One end of the color wheel 403 receives the light source WL and filters it to generate polychromatic light CL at the other end of the color wheel 403 . For example, when the light source passes through the red area of the color wheel 403 , red light is filtered out. As for the material or other details of the color wheel 403 , those skilled in the art can refer to known color wheels in projectors, so details are not repeated here. However, it is different from the known technology in that the light source module 400 can adjust the rotation speed of the color wheel 403, the brightness of the light emitting unit 402, or adjust the amount of light output by the light emitting unit 402 or the color wheel 403 according to the control of the control signal CS. The details are as follows.

In one embodiment, the control signal CS1 is used to adjust the rotation speed of the color wheel 403 , so that the time of the multi-color light output by the color wheel 403 has a specific ratio. For example, the control signal CS1 adjusts the rotational speed of the color wheel 403 such that the rotational speed decreases in a certain color area (eg red) of the color wheel 403 . That is, compared with the green and blue regions, the incident time of the light emitting unit 402 to the red region in the color wheel 403 is increased, so the other end of the color wheel 403 generates a higher proportion of red light CL.

In another embodiment, the rotational speed of the color wheel 403 remains constant, but the control signal CS2 is used to adjust the intensity of the light emitting unit 402 , and the light intensity of the multicolor light output by the color wheel 403 has a specific ratio. For example, the control signal CS2 adjusts the intensity of the light-emitting unit 402 so that when the light emitted by the light-emitting unit 402 is incident on a certain color region (for example, red) of the color wheel 403 , the intensity increases. That is, relative to the green and blue regions, the intensity of the light-emitting unit 402 incident on the red region in the color wheel 403 is increased, so a higher proportion of red light CL is generated at the other end of the color wheel 403 .

In yet another embodiment, the light source module 400 further includes a light shielding unit 404 having an aperture for adjusting the amount of light output by the light emitting unit 402 or the color wheel 403 . When the rotation speed of the color wheel 403 is kept constant, the brightness of the light emitting unit 402 is also kept constant, but the aperture size of the shading unit 404 is controlled by the control signal CS3, and the amount of light output from the light emitting unit 402 to the color wheel 403 is controlled and adjusted, so that the color wheel 403 The light intensity of the output polychromatic light has a certain ratio. For example, when the light-shielding unit 404 is between the light-emitting unit 402 or the color wheel 403, the aperture size of the light-shielding unit 404 is adjusted by the control signal CS to determine the amount of light output from the light source of the light-emitting unit 402 to the color wheel 403, so that The output light has a specific scale. It should be noted that the light-shielding unit 404 not only adjusts the amount of light output by the light-emitting unit 402 , but also adjusts the amount of light output by the color wheel 403 , so it is not limited by the above-mentioned embodiments.

In addition, the light source module 402 can also adjust the brightness or phase of the output polychromatic light according to the control signal CS, so as to achieve a specific ratio of the light intensity of the output polychromatic light. The present invention is not limited to using the above methods.

Referring to FIG. 5 , it is a schematic diagram illustrating a light source module 500 according to an embodiment of the present invention. Compared with the light-emitting unit 402 in the above embodiment that directly emits white light, the light-emitting unit 502 of the light source module 500 is composed of multiple light-emitting diodes or multiple laser diodes, which emit light of at least three colors, such as the three primary colors of red, blue and green. Preferably, by adjusting the current or voltage applied to multiple light emitting diodes or multiple laser diodes, the intensity of light emitted by each color can be directly changed, so that the light emitting unit 502 has polychromatic light CL with a specific ratio of light intensity. And, a specific proportion of polychromatic light is modulated by the control signal CS.

Therefore, by adjusting the output light intensity or light chromaticity of the light source module 400 or 500 , the phenomenon of color deviation of the external ambient light or the projected image can be effectively improved. And cooperate with the sensing unit to sense the external ambient light source or different projection areas, and adjust the light source module or the optical processing unit through the control signal of the control unit. Preferably, the projection device can also achieve the effect of automatic adjustment through the control unit.

Referring to FIG. 6 , it is a flowchart of a method for projecting an image according to an embodiment of the present invention. The method 600 for projecting an image is used in the projection device 100 shown in FIG. 1 . The method 600 for projecting an image starts at step 602, generating a sensing signal; then at step 604, generating a control signal in response to the sensing signal; then at step 606, adjusting the output polychromatic light according to the control signal; finally at step 608, receiving the output Polychromatic light used to produce projected images.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the scope of the claims of the present invention; all other equivalent changes or modifications that do not deviate from the spirit disclosed in the present invention should be included in the above-mentioned within the scope of the claims.

Claims (24)

1. A projection device for generating a projected image on an object, comprising: a sensing unit that generates a sensing signal; a control unit, coupled with the sensing unit, and generating a control signal according to the sensing signal; a light source module for outputting polychromatic light, and adjusting the output polychromatic light according to the control signal; and The optical processing unit receives the polychromatic light output by the light source module to generate the projected image. 2. The device according to claim 1, wherein the sensing unit is an image capture device. 3. The device according to claim 2, wherein the image capture device captures the projected image. 4. The device according to claim 1, wherein the light source module adjusts the polychromatic light output by the light source module according to the control signal, so as to further adjust the white balance or light intensity of the projected image. 5. The device according to claim 1, wherein the sensing unit is a light sensor. 6. The device according to claim 5, wherein the light sensor senses light intensity or light chromaticity of an external environment. 7. The device according to claim 2 or 5, wherein the optical processing unit further adjusts the white balance or light intensity of the projected image according to the control signal. 8. The device according to claim 1, wherein the light source module further comprises a plurality of light emitting diodes or a plurality of laser diodes. 9. The device according to claim 1, wherein the light source module further comprises: a light emitting unit for generating a light source; and a color wheel for filtering the light source to produce polychromatic light; The control signal is used to adjust the rotation speed of the color wheel, so that the time of the polychromatic light output by the color wheel has a specific ratio. 10. The device according to claim 1, wherein the light source module further comprises: a light emitting unit for generating a light source; and a color wheel for filtering the light source to produce polychromatic light; Wherein the control signal is used to adjust the intensity of the light emitting unit, whereby the light intensity of the polychromatic light output by the color wheel has a specific ratio. 11. The device according to claim 1, wherein the light source module further comprises: a light emitting unit for generating a light source; and a color wheel for filtering the light source to produce polychromatic light; The shading unit has an aperture and is used to adjust the amount of output light; Wherein the control signal is used to adjust the aperture of the shading unit, so that the light intensity of the polychromatic light output by the color wheel or the light source output by the light emitting unit has a specific ratio. 12. The device according to claim 1, wherein the light source module further adjusts the brightness or phase of the output polychromatic light according to the control signal. 13. A method of projecting an image, for generating a projected image on an object, the method comprising: Generate a sensing signal; generating a control signal in response to the sensing signal; adjusting the output polychromatic light according to the control signal; and The output polychromatic light is received to generate the projected image. 14. The method according to claim 13, wherein the method for generating the sensing signal further comprises sensing light intensity or light chromaticity of an external environment. 15. The method according to claim 14, wherein the method of controlling signal generation further comprises adjusting white balance or light intensity of the projected image. 16. The method of claim 13, wherein the sensing signal generating method further comprises capturing the projected image. 17. The method of claim 16, wherein the method of controlling signal generation further comprises adjusting white balance or light intensity of the projected image. 18. The method according to claim 13, wherein the method for generating polychromatic light further comprises generating a light source through a light emitting unit and generating the polychromatic light via a color wheel. 19. The method according to claim 18, wherein the method for controlling signal generation further comprises adjusting the rotational speed of the color wheel, whereby the time of the polychromatic light output by the color wheel has a specific ratio. 20. The method according to claim 18, wherein the method for controlling signal generation further comprises adjusting the output intensity of the light source so that the light intensity of the polychromatic light output via the color wheel has a specific ratio. 21. The method according to claim 18, wherein the method for generating the control signal further includes adjusting the aperture of the shading unit so that the light intensity of the polychromatic light output via the color wheel or the polychromatic light output by the light source has specific ratio. 22. The method according to claim 18, wherein the method of controlling signal generation further comprises adjusting the brightness or phase of the output polychromatic light. 23. An electronic device having the projection device according to claim 1, comprising: A projection device for generating a projected image on an object, comprising: a sensing unit that generates a sensing signal; a control unit, coupled with the sensing unit, and generating a control signal according to the sensing signal; a light source module for outputting polychromatic light, and adjusting the output polychromatic light according to the control signal; and an optical processing unit, receiving the polychromatic light output by the light source module, and generating the projected image; Wherein the light source module adjusts the polychromatic light output by the light source module according to the control signal, so as to further adjust the white balance or light intensity of the projected image. 24. The electronic device according to claim 23, wherein the electronic device is a personal computer, a notebook computer, a personal digital assistant, a mobile phone or a mobile audio-visual device.

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