Multi-brightness projection equipment

Abstract

A multi-brightness projection device comprises a light source, a light beam adjusting element, a dodging device, a brightness adjusting element, a moving device and a brightness controller. The light source is configured to emit a light beam. The light beam adjusting element is coupled with the light source on the light path, wherein the light beam adjusting element is configured to adjust the passable wavelength range of the light beam or the spread angle of the light beam after passing. The dodging device is configured to receive the light beam passing through the light beam adjusting element. The brightness adjusting element is configured to reduce the brightness of the light beam entering the brightness adjusting element without filtering the specific color light. The moving device is configured to move the brightness adjusting element, and the brightness adjusting element can selectively enter or leave the light path of the light beam. The brightness controller is electrically connected with the light source and the mobile device, wherein the brightness controller is configured to control the mobile device and the light source.

Description

Technical Field

[0001] The present disclosure relates to a multi-segment brightness projection device. Background Art

[0002] When a projection device has a low brightness projection requirement, a common approach is to reduce the wattage of the light source or turn off some of the light sources. However, the light source has a basic starting current, which limits the minimum brightness.

[0003] Turning off some light sources will result in loss of image uniformity. If the aperture in the projection device is reduced, the overall brightness will be affected, and a single projection device cannot meet the needs of multiple brightness control.

[0004] In view of this, how to provide a multi-stage brightness control function that is not limited by the brightness of the light source in a single projection device is still one of the directions that urgently need to be studied. Utility Model Content

[0005] A technical aspect of the present disclosure is a multi-segment brightness projection device.

[0006] In one embodiment, a multi-segment brightness projection device includes a light source, a beam adjustment element, a light homogenizer, a brightness adjustment element, a moving device, and a brightness controller. The light source is configured to emit a light beam. The beam adjustment element is coupled to the light source on the optical path, wherein the beam adjustment element is configured to adjust the wavelength range through which the light beam can pass or the diffusion angle after the light beam passes. The light homogenizer is configured to receive the light beam passing through the beam adjustment element. The brightness adjustment element is configured to reduce the brightness of the light beam entering the brightness adjustment element without filtering a specific color light. The moving device is configured to move the brightness adjustment element, and can selectively make the brightness adjustment element enter or leave the optical path of the light beam. The brightness controller is electrically connected to the light source and the moving device, wherein the brightness controller is configured to control the moving device and the light source.

[0007] In one embodiment, the brightness adjustment element is located between the light source and the light beam adjustment element.

[0008] In one embodiment, the brightness adjustment element is located on a side of the light diffuser away from the beam adjustment element.

[0009] In one embodiment, the brightness adjustment element is located between the beam adjustment element and the light diffuser.

[0010] In one embodiment, the light beam adjustment element is a color wheel or a diffuser.

[0011] In one embodiment, the multi-segment brightness projection device further comprises a light-transmitting element. The moving device is configured to move the light-transmitting element and selectively enable the light-transmitting element to enter or leave the optical path of the light beam.

[0012] In one embodiment, the light-transmitting element is located between the light source and the light diffuser.

[0013] In one embodiment, the brightness adjustment element is located on a side of the light diffuser away from the beam adjustment element.

[0014] In one embodiment, the moving device is configured to simultaneously move the brightness adjustment element and the light-transmitting element, and the moving device is configured to make one of the brightness adjustment element and the light-transmitting element pass through the light path of the light beam.

[0015] In one embodiment, the brightness adjustment element is separated from the light-transmitting element, and the brightness adjustment element and the light-transmitting element are independently arranged in a direction perpendicular to the light path of the light beam.

[0016] In the above embodiment, the mobile device moves the brightness adjustment element according to different projection modes, and in combination with the brightness control operation, multiple brightness projection modes such as high brightness, low brightness and ultra-low brightness can be provided on a single projection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of a multi-stage brightness projection device according to an embodiment of the present disclosure;

[0018] Figure 2 is a schematic diagram of a multi-segment brightness projection device according to another embodiment of the present disclosure;

[0019] Figure 3 is a schematic diagram of a multi-segment brightness projection device according to another embodiment of the present disclosure;

[0020] Figure 4 is a schematic diagram of a multi-segment brightness projection device according to another embodiment of the present disclosure;

[0021] Figure 5 FIG. 4 is a schematic diagram of a multi-segment brightness projection device according to another embodiment of the present disclosure.

[0022]

Explanation of symbols

[0023] 100,100a,100b,100c,100d:Multi-segment brightness projection equipment

[0024] 110: Light source

[0025] 120: Beam adjustment element

[0026] 130: Light diffuser

[0027] 140,140a: Brightness adjustment element

[0028] 150: Mobile device

[0029] 160:Brightness controller

[0030] 170,170a: Light penetrating element

[0031] L: Beam

[0032] D1: First direction DETAILED DESCRIPTION

[0033] The following will disclose multiple embodiments of the present disclosure with the accompanying drawings. For the sake of clarity, many practical details will be described together in the following description. However, it should be understood that these practical details should not be used to limit the present disclosure. That is, in some embodiments of the present disclosure, these practical details are not necessary. In addition, in order to simplify the drawings, some known conventional structures and elements will be illustrated in the drawings in a simple schematic manner. And for the sake of clarity, the thickness of the layers and regions in the drawings may be exaggerated, and the same element symbols represent the same elements in the description of the drawings.

[0034] Figure 1 Schematic diagram of a multi-stage brightness projection device 100 according to an embodiment of the present disclosure. The multi-stage brightness projection device 100 includes a light source 110, a beam adjustment element 120, a homogenizer 130, a brightness adjustment element 140, a moving device 150, and a brightness controller 160. The light source 110 is configured to emit a light beam L. The light beam adjustment element 120 is coupled to the light source 110 on the optical path, and is configured to adjust the wavelength range through which the light beam L can pass or the diffusion angle after passing. The homogenizer 130 is configured to receive the light beam L passing through the light beam adjustment element 120. The brightness adjustment element 140 filters the light beam L and is configured to reduce the brightness of the light beam entering the brightness adjustment element 140 without filtering a specific color light. Specifically, the brightness adjustment element 140 can reduce the brightness of the light beam L. In other words, the brightness adjustment element 140 has the same brightness adjustment effect for light beams L in different wavelength ranges, and is not limited to a specific wavelength range.

[0035] The moving device 150 is configured to move the brightness adjustment element 140 and selectively make the brightness adjustment element 140 enter or leave the light path of the light beam L. The brightness controller 160 connects the light source 110 and the moving device 150. The brightness controller 160 is configured to control the moving device 150 to move the brightness adjustment element 140 and control the light intensity of the light source 110.

[0036] The multi-stage brightness projection device 100 further includes a light penetrating element 170 located between the light source 110 and the light homogenizer 130 . The moving device 150 is also connected to the light penetrating element 170 . The material of the light penetrating element 170 is, for example, glass. The brightness adjustment element 140 is located between the light source 110 and the light beam adjustment element 120 .

[0037] The multi-stage brightness projection device 100 of this embodiment is in a high brightness projection state. The moving device 150 causes the brightness adjustment element 140 to leave the optical path of the light beam L, and causes the light penetrating element 170 to enter the optical path of the light beam L. In other words, the light beam L of the multi-stage brightness projection device 100 passes through the light penetrating element 170, the light beam adjustment element 120, and the light homogenizer 130 in sequence, and does not pass through the brightness adjustment element 140.

[0038] The brightness controller 160 controls the pulse width modulation parameters of the light source 110. For example, the pulse width modulation parameters of the red light, green light, blue light and yellow light of the light source 110 are set at 40 as the minimum value and 180 as the maximum value. In the high brightness projection state, the pulse width modulation parameter of the light source 110 in this embodiment is set at 180 as an example. High brightness projection can be applied to large conference presentation projection mode.

[0039] In this embodiment, the light source 110 may be a combination of a monochromatic laser and a phosphor wheel, and the light beam adjustment element 120 is a color wheel. The color wheel can adjust the wavelength range of the light beam L to emit light beams of different colors. In other embodiments, the light source 110 may be a light emitting diode or a pure laser, and the light beam adjustment element 120 may be a diffuser. The diffuser can adjust the diffusion angle of the light beam L.

[0040] Figure 2 Schematic diagram of a multi-stage brightness projection device 100a according to another embodiment. The multi-stage brightness projection device 100a in this embodiment is in a low brightness projection state. The pulse width modulation parameter of the light source 110 is taken as the lowest value 40 as an example. The settings of the multi-stage brightness projection device 100a are the same as those of the multi-stage brightness projection device 100, and are not repeated here. Low brightness projection can be applied to a general photo projection mode or a power saving mode.

[0041] Figure 3 1 is a schematic diagram of a multi-stage brightness projection device 100b according to another embodiment. The multi-stage brightness projection device 100b in this embodiment is in an ultra-low brightness projection state. Generally speaking, the light source 110 needs a minimum starting current to emit light normally. When the pulse width modulation parameter of the light source 110 is lower than the minimum value 40, the light source 110 will not emit light normally. Therefore, when the brightness requirement of the projection device is lower, the brightness of the light beam L can be further reduced by the brightness adjustment element 140. Ultra-low brightness projection can be applied to the projection mode of special scenes.

[0042] In the known practice, if there are multiple light sources 110, turning off some of the light sources 110 will reduce the uniformity of the image. In addition, if the aperture in the projection device is reduced, the overall brightness of the projection device will be reduced, which cannot meet the requirements of multi-stage brightness control.

[0043] In this embodiment, the minimum value of the pulse width modulation parameter of the light source 110 is 40. The moving device 150 causes the light penetrating element 170 to leave the optical path of the light beam L, and causes the brightness adjustment element 140 to enter the optical path of the light beam L. In other words, the light beam L of the multi-segment brightness projection device 100b passes through the brightness adjustment element 140, the light beam adjustment element 120, and the light homogenizer 130 in sequence, and does not pass through the light penetrating element 170.

[0044] In this way, the projection brightness of the multi-stage brightness projection device 100b is not limited by the minimum brightness of the light source 110, providing users with multiple display modes. In this way, the uniformity of the picture can be maintained without reducing the overall brightness.

[0045] exist Figures 1 to 3 In the example, the brightness adjustment element 140 and the light-transmitting element 170 are independently arranged in a first direction D1 perpendicular to the light path of the light beam L. The brightness adjustment element 140 and the light-transmitting element 170 are not designed as a single piece. In other words, the brightness adjustment element 140 and the light-transmitting element 170 do not need to use different coatings on the same piece of material, which can reduce the complexity of the process.

[0046] exist Figures 1 to 3 In the example, the moving device 150 simultaneously moves the brightness adjustment element 140 and the light-transmitting element 170 along the first direction D1, so that one of them passes through the light path of the light beam L. Therefore, the light beam L must pass through one of the brightness adjustment element 140 and the light-transmitting element 170, thereby maintaining the light shape of the light beam L.

[0047] Figure 4 FIG. 1 is a schematic diagram of a multi-segment brightness projection device 100c according to another embodiment of the present disclosure. Figure 3 The multi-stage brightness projection device 100 b is also in the ultra-low brightness projection state, and the difference is that the brightness adjustment element 140 and the light transmission element 170 of the multi-stage brightness projection device 100 c are located between the light beam adjustment element 120 and the light homogenizer 130 .

[0048] Figure 5 FIG. 1 is a schematic diagram of a multi-segment brightness projection device 100d according to another embodiment of the present disclosure. Figure 3The multi-stage brightness projection device 100 b is also in the ultra-low brightness projection state, the difference is that the brightness adjustment element 140 a of the multi-stage brightness projection device 100 d is located on the side of the light homogenizer 130 away from the light beam adjustment element 120 .

[0049] In this embodiment, the light beam L passes through the light beam adjustment element 120, the light homogenizer 130 and the brightness adjustment element 140a in sequence. Since the light spot of the light beam L is reduced after passing through the light homogenizer 130, and the configuration can be closer to the light homogenizer 130, it can be smaller than Figures 1 to 4 The brightness adjustment element 140 in the embodiment of the present invention.

[0050] The light-transmitting element 170a in this embodiment can be the same light-transmitting element 170 as in the previous embodiment. Figures 1 to 5 The light-transmitting elements 170 and 170a in the embodiment may also be selectively omitted. Figures 1 to 4 The light penetrating element 170 or Figure 5 The light-transmitting element 170a can preferably ensure that the light path of the light beam L when passing through the brightness adjustment elements 140, 140a and the light path when passing through the light-transmitting elements 170, 170a remain the same.

[0051] In summary, the present disclosure uses a mobile device to move the brightness adjustment element according to different projection modes, and in combination with brightness control operations, it can provide multiple brightness projection modes such as high brightness, low brightness and ultra-low brightness on a single projection device. The projection brightness of a multi-stage brightness projection device is not limited by the minimum brightness of the light source, providing users with a variety of display modes. In this way, the uniformity of the picture can also be maintained without reducing the overall brightness. The brightness adjustment element is separated from the light penetration element, and there is no need to use different coatings on the same piece of material, which can reduce the complexity of the process. The light beam must pass through one of the brightness adjustment element and the light penetration element to maintain the light shape of the light beam.

[0052] Although the present disclosure has been disclosed in the above embodiments, it is not intended to limit the present disclosure. Anyone familiar with this technology can make various changes and modifications without departing from the spirit and scope of the present disclosure. Therefore, the scope of protection of the present disclosure shall be based on the scope defined by the attached claims.

Claims

1. A multi-segment brightness projection device, characterized in that: Include: a light source configured to emit a light beam; a beam adjusting element coupled to the light source on an optical path, wherein the beam adjusting element is configured to adjust a passable wavelength range of the light beam or a diffusion angle of the light beam after passing through; a light homogenizer configured to receive the light beam passing through the light beam adjustment element; a brightness adjustment element configured to reduce the brightness of the light beam entering the brightness adjustment element without filtering the specific color light; as well as a moving device configured to move the brightness adjustment element so as to selectively allow the brightness adjustment element to enter or leave the light path of the light beam; and A brightness controller is electrically connected to the light source and the mobile device, wherein the brightness controller is configured to control the mobile device and the light source.

2. The multi-segment brightness projection device according to claim 1, characterized in that: The brightness adjustment element is located between the light source and the light beam adjustment element.

3. The multi-segment brightness projection device according to claim 1, characterized in that: The brightness adjustment element is located at a side of the light homogenizer away from the light beam adjustment element.

4. The multi-segment brightness projection device according to claim 1, characterized in that: The brightness adjustment element is located between the light beam adjustment element and the light homogenizer.

5. The multi-segment brightness projection device according to claim 1, characterized in that: The light beam adjustment element is a color wheel or a diffusion sheet.

6. The multi-segment brightness projection device according to claim 1, characterized in that: Also includes: A light-transmitting element, the moving device is configured to move the light-transmitting element, and can selectively make the light-transmitting element enter or leave the light path of the light beam.

7. The multi-segment brightness projection device according to claim 6, characterized in that: The light penetrating element is located between the light source and the light homogenizer.

8. The multi-segment brightness projection device according to claim 7, characterized in that: The brightness adjustment element is located at a side of the light homogenizer away from the light beam adjustment element.

9. The multi-segment brightness projection device according to claim 6, characterized in that: The moving device is configured to move the brightness adjustment element and the light-transmitting element simultaneously, and the moving device is configured to make one of the brightness adjustment element and the light-transmitting element pass through the light path of the light beam.

10. The multi-segment brightness projection device according to claim 9, characterized in that: The brightness adjustment element and the light penetrating element are independently arranged in a direction perpendicular to the light path of the light beam.

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