CN109884845B - Projection device - Google Patents
Projection device Download PDFInfo
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- CN109884845B CN109884845B CN201711276687.1A CN201711276687A CN109884845B CN 109884845 B CN109884845 B CN 109884845B CN 201711276687 A CN201711276687 A CN 201711276687A CN 109884845 B CN109884845 B CN 109884845B
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
Abstract
The present invention relates to a projection device. The projection device has a first mode and a second mode, and comprises a light source device and a spatial light modulator, wherein the light source device is used for emitting light source light, and the light source light comprises blue light and other color light. The spatial light modulator is used for modulating the light source light by image data to generate image light. Wherein the luminous flux of the other color light emitted by the light source device when the projection apparatus is in the second mode is larger than the luminous flux of the other color light emitted by the light source device when the projection apparatus is in the first mode, and when the projection apparatus is in the second mode, the luminous flux proportion of the other color light in the light source light is larger than the luminous flux proportion of the other color light in the light source light when the projection apparatus is in the first mode. The first mode is switched to the second mode, so that the damage of the light emitted by the projection device to people is reduced.
Description
Technical Field
The invention relates to the technical field of projection display, in particular to projection equipment.
Background
Studies have shown that blue light may have an effect on the human eye: firstly, the visual fatigue is increased due to the over-high content of blue light, and secondly, the physiological development of eyes is influenced; and thirdly, under the light environment for a long time, the possibility of inducing macular degeneration of the human eyes is increased when the human eyes are aged. Therefore, how to improve the damage of blue light to human eyes is an important issue in the field of projection display. With the increasing attention paid to blue light hazards, countries have also begun to set up relevant safety standards for blue light hazards to reduce blue light hazards in products.
In particular, in the field of laser projection, laser projection is increasingly favored due to its advantages of long lifetime, high brightness, and the like, however, the current light source for exciting projection generally adopts a blue laser light source to provide a blue light source, and simultaneously adopts a technology of exciting a wavelength conversion material with blue laser to generate light of other colors, such as excitation of a green wavelength conversion material with blue laser to generate required green light, excitation of a red wavelength conversion material to generate required red light, excitation of a yellow wavelength conversion material to generate required red light and green light, and the like. Therefore, in a projection apparatus using a white light source formed by mixing laser light and fluorescence light, as shown in fig. 1 and fig. 2, the bandwidth of blue light is narrow, the ratio of the blue light power to the total visible light spectrum is high, and the ratio of the peak of the blue light spectrum optical power density to the peak of the non-blue light spectrum optical power density may also be large, so that the damage to human eyes may be large, and there is a need for improvement.
Disclosure of Invention
In order to solve the technical problem that the blue light of the existing projection equipment causes damage to human eyes, the invention provides projection equipment capable of improving the damage of the blue light to the human eyes, which has a first mode and a second mode, and comprises: a light source device for emitting light source light including blue light and other color light; and a spatial light modulator for modulating the light source light according to image data to generate image light, wherein a luminous flux of the other color light emitted by the light source device when the projection apparatus is in the second mode is larger than a luminous flux of the other color light emitted by the light source device when the projection apparatus is in the first mode, and a luminous flux ratio of the other color light in the light source light is larger than a luminous flux ratio of the other color light in the light source light when the projection apparatus is in the first mode when the projection apparatus is in the second mode.
In one embodiment, the other color light includes a first color light, and a luminous flux of the first color light emitted by the light source device when the projection apparatus is in the second mode is larger than a luminous flux of the first color light emitted by the light source device when the projection apparatus is in the first mode.
In one embodiment, the photopic vision spectral luminous efficacy of the peak wavelength of the first color light is greater than the photopic vision spectral luminous efficacy of the peak wavelength of the blue light.
In one embodiment, the other color light includes a second color light, and a luminous flux of the second color light emitted by the light source device when the projection apparatus is in the second mode is greater than a luminous flux of the second color light emitted by the light source device when the projection apparatus is in the first mode, wherein the first color light is red light and the second color light is green light or the first color light is green light and the second color light is red light.
In one embodiment, the luminous flux of the blue light emitted by the light source device when the projection apparatus is in the second mode is smaller than the luminous flux of the blue light emitted by the light source device when the projection apparatus is in the first mode.
In one embodiment, a ratio of an optical power density peak of the blue light emitted by the light source device when the projection apparatus is in the second mode to an optical power density peak of the first color light or the second color light is smaller than a ratio of an optical power density peak of the blue light to an optical power density peak of the first color light or the second color light when the light source device is in the first mode.
In one embodiment, the projection apparatus further includes a light source driver, configured to emit a driving signal to control a driving current of the light source device, so as to control the other color light emitted by the light source device, where the driving current of the light source device includes a first driving current for controlling the blue light and a second driving current for controlling the first color light.
In one embodiment, a current value of the first driving current of the light source device when the projection apparatus is in the second mode is smaller than a current value of the first driving current of the light source device when the projection apparatus is in the first mode; or the pulse width of the first driving current of the light source device when the projection device is in the second mode is smaller than the pulse width of the first driving current of the light source device when the projection device is in the first mode.
In one embodiment, a current value of the second driving current of the light source device when the projection apparatus is in the second mode is larger than a current value of the second driving current of the light source device when the projection apparatus is in the first mode; or the pulse width of the second driving current of the light source device when the projection device is in the second mode is larger than the pulse width of the second driving current of the light source device when the projection device is in the first mode.
In one embodiment, the projection device further comprises an auxiliary light source for emitting an auxiliary color light, the auxiliary color light being non-blue light; when the projection equipment is in a first mode, the auxiliary light source is not started, and when the projection equipment is in a second mode, the auxiliary light source is started.
In one embodiment, the auxiliary color light and the first color light belong to the same color light, and the full width at half maximum of the spectrum of the auxiliary color light is not more than 20 nm.
In one embodiment, when the projection device is in the second mode, the power of the blue light in the light source light is less than 20%, and the ratio of the peak of the optical power density of the other color light to the peak of the optical power density of the blue light is greater than or equal to 50%.
Compared with the prior art, the projection equipment has the second mode and the first mode, in the second mode, the luminous flux ratio of the light of other colors, which is not blue, in the light source light is improved, the luminous flux of the light of other colors emitted by the light source device is increased, and as human eyes are sensitive to the light of other colors, such as yellow, green and the like, when the luminous flux of the light of other colors is higher than that of blue light, the human eyes can automatically perform self protection through a defense mechanism, such as pupil contraction or blinking and the like, and further when the same picture is displayed, the blue light entering the human eyes in the second mode is less than the blue light entering the human eyes in the first mode, so that the aim of protecting eyes can be achieved.
Drawings
FIG. 1 is a schematic spectral diagram of a white light source of a prior art projection device.
Fig. 2 is a diagram of a normalized spectrum of a prior art projection device.
Fig. 3 is a schematic structural diagram of a projection apparatus according to a preferred embodiment of the invention.
Fig. 4-7 are waveforms of driving current for each color of light for the four embodiments of the projection apparatus shown in fig. 3.
Fig. 8 is a graph of spectral optical efficiency of the human eye in photopic vision.
Fig. 9 is a diagram of a normalized spectrum of a light source device of a projection apparatus according to the present invention in a second mode.
Description of the main elements
Spatial light modulator 130
A first drive current I1
Second drive current I2
Third drive current I3
The following detailed description will further illustrate the invention in conjunction with the above-described figures.
Detailed Description
Referring to fig. 3, fig. 3 is a schematic structural diagram of a projection apparatus 100 according to a preferred embodiment of the invention. The projection apparatus 100 includes a light source device 110, a light source driver 120, a spatial light modulator 130, and a lens 140. The projection device 100 has two modes, a first mode and a second mode, when in operation. It is understood that the switching between the first mode and the second mode may be implemented by a user operating a mechanical key or an interface operation menu displayed by the projection apparatus 100, which is not described herein in detail. The first mode may be a normal mode, i.e. a normal display mode, and the second mode is an eye protection mode, i.e. a mode different from the normal mode and beneficial to human eye protection.
The light source device 110 is used for emitting light source light, which includes blue light and other color light, such as a first color light and a second color light. The luminous flux of the other color light emitted by the light source device 110 when the projection apparatus 100 is in the second mode is larger than the luminous flux of the other color light emitted by the light source device 110 when the projection apparatus 100 is in the first mode, and when the projection apparatus 100 is in the second mode, the luminous flux ratio of the other color light in the light source light is larger than the luminous flux ratio of the other color light in the light source light when the projection apparatus 100 is in the first mode.
In the first embodiment, the luminous flux of the first color light emitted by the light source device 110 when the projection apparatus 100 is in the second mode is larger than the luminous flux of the first color light emitted by the light source device 110 when the projection apparatus 100 is in the first mode. Specifically, by performing a test on the outgoing light at the time of the all-white image, the peak value of the optical power density (or the peak value of illuminance) of the first color light emitted by the light source device 110 when the projection apparatus 100 is in the second mode is larger than the peak value of the first color light emitted by the light source device 110 when the projection apparatus 100 is in the first mode.
In a second embodiment, the luminous flux of the second color light emitted by the light source device 110 when the projection apparatus 100 is in the second mode is larger than the luminous flux of the second color light emitted by the light source device 110 when the projection apparatus 100 is in the first mode. Specifically, the peak value of the optical power density of the second color light emitted by the light source device 110 when the projection apparatus 100 is in the second mode is larger than the peak value of the optical power density of the second color light emitted by the light source device 110 when the projection apparatus 100 is in the first mode.
In the third embodiment, the light flux of the first color light emitted by the light source device 110 when the projection apparatus 100 is in the second mode is larger than the light flux of the first color light emitted by the light source device 110 when the projection apparatus 100 is in the first mode. Also, the light flux of the second color light emitted by the light source device 110 when the projection apparatus 100 is in the second mode is larger than the light flux of the second color light emitted by the light source device 110 when the projection apparatus 100 is in the first mode.
Further, in the above three embodiments, the luminous flux of the blue light emitted by the light source device 110 when the projection apparatus 100 is in the second mode may be less than or equal to the luminous flux of the blue light emitted by the light source device when the projection apparatus 100 is in the first mode. In particular, in one embodiment, the blue light emitted by the projection device in the second mode is reduced, thereby directly reducing the luminous flux of the blue light entering the human eye and performing an eye protection function. Specifically, the ratio of the peak of the optical power density of the blue light emitted by the light source device 110 when the projection apparatus 100 is in the second mode to the peak of the optical power density of the first color light or the second color light is smaller than the ratio of the peak of the optical power density of the blue light emitted by the light source device 110 when the projection apparatus 100 is in the first mode to the peak of the optical power density of the first color light or the second color light.
Of course, the blue light does not necessarily decrease in the second mode, for example, in one other embodiment, the blue light emitted by the light source device slightly increases in the second mode relative to the first mode, but when the projection apparatus is still kept in the second mode, the luminous flux ratio of the other color light in the light source light is larger than that of the other color light in the light source light when the projection apparatus is in the first mode, that is, although the total amount of the blue light is slightly increased, the ratio of the blue light decreases. Under this technical scheme, through the biological protection mechanism's of people's eye trigger that leads to of other colour light increases still can make the total amount that gets into blue light reduce to play the function of eyeshield.
In one embodiment of the present invention, the photopic vision spectral luminous efficacy of the peak wavelength of the first color light is greater than the photopic vision spectral luminous efficacy of the peak wavelength of the blue light. That is, the same amount of first color light is more likely to produce a "bright" feel to a person relative to blue light. Under the technical scheme, the luminous flux of the first color light is increased in the second mode, so that human eyes obviously feel that the light emitted by the projection equipment becomes bright, pupils and the like are automatically contracted, the total luminous flux entering the human eyes is reduced, and the total luminous flux entering the human eyes is kept unchanged as much as possible. Because the proportion of the blue light is reduced, the blue light entering human eyes is also reduced, and therefore the human eyes are protected from being damaged by the blue light.
In one embodiment of the present invention, the photopic vision spectral luminous efficacy of the peak wavelength of the first color light is greater than 10 times the photopic vision spectral luminous efficacy of the peak wavelength of the blue light, so that the increase in luminance is noticeable to the human eye when the first color light is increased.
It is understood that the first color light may be red light and the second color light may be green light, but in a modified embodiment, the first color light may be green light and the second color may be red light. The first color light and the second color light are not limited to red light or green light, and may be mixed light such as yellow light and reddish orange light.
Further, in the present embodiment, the light source driver 120 is configured to emit a driving signal to control the driving current of the light source device 110, so as to control the first color light and the second color light emitted by the light source device 110, wherein the driving current of the light source device 110 includes the first driving current I for controlling the blue light1And a second driving current I for controlling the first color light2And a third driving current I for controlling the second color light3Thereby controlling the luminous flux, the peak value of the optical power density, and the like of the blue light, the first color light, and the second color light. It is understood that the second driving current I is generated when the light source device 110 uses the blue excitation light source to emit the blue excitation light to excite the phosphor to generate other colors of light2Actually, the driving current for driving the blue excitation light source, the third driving current I3It is also the actual driving current for driving the blue excitation light source, and in addition, the blue light can also use a part of the blue excitation light emitted by the blue excitation light source, therefore, the first driving current I1May be a blue drive current that drives a blue excitation light source. However, in another embodiment, for example, in the light source device 110, the ultraviolet excitation light source emits external light to excite the phosphor to generate blue light and other color lights, the first, second and third driving currents I1, I2, I3May be the uv drive current driving the uv excitation light source, respectively.
Specifically, in the first embodiment, the second driving current I of the light source device 110 when the projection apparatus 100 is in the second mode2Current ofThe value may be larger than the second driving current I of the light source device 110 when the projection apparatus 100 is in the first mode2The current value of (1). In a modified embodiment of the first embodiment, the second driving current I of the light source device 110 when the projection apparatus 100 is in the second mode2Is larger than the second driving current I of the light source device 110 when the projection apparatus 100 is in the first mode2The pulse width of (2).
In the second embodiment, the third driving current I of the light source device 110 when the projection apparatus 100 is in the second mode3May be larger than the third driving current I of the light source device 110 when the projection apparatus 100 is in the first mode3The current value of (1). In a modified embodiment of the first embodiment, the third driving current I of the light source device 110 when the projection apparatus 100 is in the second mode3Is larger than the third driving current I of the light source device 110 when the projection apparatus 100 is in the first mode3The pulse width of (2).
Referring to fig. 4, fig. 4 is a waveform diagram of driving current for each color of light in the third embodiment of the projection apparatus 100 shown in fig. 3. In the third embodiment, the second driving current I of the light source device 110 when the projection apparatus 100 is in the second mode2May be larger than the second driving current I of the light source device 110 when the projection apparatus 100 is in the first mode2And the third driving current I of the light source device 110 when the projection apparatus 100 is in the second mode3May be larger than the third driving current I of the light source device 110 when the projection apparatus 100 is in the first mode3The current value of (1). At this time, the first driving current I of the light source device 110 when the projection apparatus 100 is in the second mode1May be equal to the first driving current I of the light source device 110 when the projection apparatus 100 is in the first mode1The current value of (a) is set,
referring to fig. 5, fig. 5 is a waveform diagram of driving current for each color of light in a variation of the third embodiment of the projection apparatus 100 shown in fig. 3. In a modified embodiment of the third embodiment, the light source device 110 is in the second mode when the projection apparatus 100 is in the second modeSecond drive current I of time2Is larger than the second driving current I of the light source device 110 when the projection apparatus 100 is in the first mode2And the third driving current I of the light source device 110 when the projection apparatus 100 is in the second mode3Is larger than the third driving current I of the light source device 110 when the projection apparatus 100 is in the first mode3The pulse width of (2). At this time, the first driving current I of the light source device 110 when the projection apparatus 100 is in the second mode1Is equal to the first driving current I of the light source device 110 when the projection apparatus 100 is in the first mode1The pulse width of (2).
It is understood that, as shown in FIG. 6, in a modified embodiment of the embodiment shown in FIG. 4, the first driving current I of the light source device 110 when the projection apparatus 100 is in the second mode1May be smaller than the first driving current I of the light source device 110 when the projection apparatus 100 is in the first mode1The current value of (1). Alternatively, as shown in FIG. 7, in a modified embodiment of the embodiment shown in FIG. 5, the first driving current I of the light source device 110 when the projection apparatus 100 is in the second mode1May also be smaller than the first driving current I of the light source device 110 when the projection apparatus 100 is in the first mode1The pulse width of (2).
In an embodiment of the invention, the light source driver 120 emits the driving signal to control the light emitted from the light source device 110, so that when the projection apparatus 100 is in the second mode, the power of the blue light in the light source light accounts for less than 20%, and the ratio of the peak of the optical power density of the other color lights to the peak of the optical power density of the blue light is greater than or equal to 50%. The blue light ratio is such that the damage to the human eye by the light emitted by the projection device is within an acceptable range.
In one embodiment of the present invention, the projection device further includes an auxiliary light source for emitting an auxiliary color light, the auxiliary color light being non-blue light, the auxiliary light source being not turned on when the projection device is in the first mode, and the auxiliary light source being turned on when the projection device is in the second mode. Under this technical scheme, need not be through the drive current who adjusts light source device, can be so that light source device's work is more stable.
In one embodiment, the auxiliary light source is a light source independent from the light source device and can be controlled independently. It is understood that the auxiliary light source may be integrated with the light source device.
In one embodiment, the auxiliary light source may be a green laser and/or a red laser independently existing for emitting green light and/or red light, and particularly, in this technical scheme, the green light and/or the red light as laser has a narrower spectrum, which can significantly improve the peak power density of the optical power density of non-blue light. In one embodiment, the auxiliary color light and the first color light belong to the same color light, and the auxiliary color light is narrow spectrum light, the full width at half maximum of the spectrum of the narrow spectrum light is not more than 20nm, and the brightness feeling of human eyes can be obviously increased.
The spatial light modulator 130 modulates the light source light with image data to generate image light. The lens 140 receives the image light generated by the spatial light modulator 130 and projects the image light to a predetermined position or a predetermined element (such as a projection screen or a wall, etc.) to display a projected image.
The spatial light modulator 130 may be a single-chip type, a two-chip type or a three-chip type, when the spatial light modulator is a single-chip type, red, green and blue light enters the spatial light modulator in a time sequence, and the spatial light modulator emits light of three colors in a time sequence modulation manner; when the two-chip spatial light modulator is used, one spatial light modulator can modulate the blue light and the second color light, and the other spatial light modulator can modulate the first color light; when the three-chip spatial light modulator is used, red light, green light and blue light respectively enter the three spatial light modulators, and the three colors of light do not need to be modulated in a time division sequence. Spatial light modulator 130 may be a DMD, LCD, or the like.
As can be seen from the foregoing description, by controlling the luminous fluxes of the other color light and the blue light in the two modes, the luminous flux of the other color light emitted by the light source device 110 when the projection apparatus 100 is in the second mode is greater than the luminous flux of the other color light emitted by the light source device 110 when the projection apparatus 100 is in the first mode, and then the power proportion of the blue light emitted by the light source device 110 when the projection apparatus 100 is in the second mode in the light source light is smaller than the power proportion of the blue light emitted by the light source device 110 when the projection apparatus 100 is in the first mode in the light source light, which is further beneficial to protect human eyes in the second mode.
Specifically, referring to fig. 8, fig. 8 is a graph of spectral luminous efficiency of human eye in photopic vision. The human eye can automatically adjust the luminous flux entering the human eye by adjusting the size of the pupil. Because human eyes are not sensitive to blue light, after the proportion of the blue light in the spectral components is increased, the human eyes do not feel bright, pupils do not shrink so much, and the human eyes cannot be protected by a defense mechanism such as blinking and the like. The human eye is sensitive to other colors of light such as green light and yellow light, and when the proportion of the other colors of light (including the second color of light and the first color of light) in the spectrum is increased, the human eye can obviously feel bright, and at the moment, the human eye can protect the eye through a pupil contraction or wink defense mechanism. Specifically, human eyes can be used as camera objective lenses, D is equivalent to pupils of the human eyes according to the illumination formula 1 of the image plane objective lenses, when the brightness of an object is improved (due to the increase of non-blue light spectral components), the illumination value of retinas is not changed, the diameters of the pupils of the human eyes can be reduced, so that the purpose of keeping the illumination entering the human eyes unchanged when the brightness is improved is achieved, and the percentage of blue light in the spectrum is reduced to be less than 20% at the moment, so that the blue light entering the human eyes is remarkably reduced relative to a normal mode, and the purpose of protecting the eyes is achieved.
According to the above principle, in the projection apparatus 100, in the second mode, the peak ratio of the optical power density of the blue light to the optical power density of the other color light is smaller than that of the blue light in the first mode, and since human eyes are sensitive to the other color light such as yellow, green, red, etc., when the peak ratio of the optical power density of the other color light is higher than that of the blue light, the human eyes can automatically perform self-protection through a pupil contraction or blinking protection mechanism, etc., so that when the same picture is displayed, the blue light entering the human eyes in the second mode is less than the blue light entering the human eyes in the first mode, and the purpose of protecting eyes can be achieved.
Further, referring to fig. 9, fig. 9 is a schematic diagram of a normalized spectrum of a light source device of a projection apparatus in a second mode according to the present invention. A diagram of a normalized spectrum of a light source of a projection device of the present invention sitting in the first mode can be seen in fig. 2. By contrast, it can be found that the ratio and peak value of the light of other colors are improved. In this embodiment, the light source driver 120 sends the driving signal to control the light output of the light source device 110, so that when the projection apparatus 100 is in the second mode, the power of the blue light in the light source light accounts for less than 20%, and the ratio of the peak value of the optical power density of the other color light to the peak value of the optical power density of the blue light is greater than or equal to 50%, so as to achieve a better eye protection effect.
In summary, compared to the prior art, the projection apparatus 100 of the present invention has two modes, i.e., the second mode and the first mode, in the second mode, the luminous flux of the light of the other colors emitted by the light source device is larger, and especially the peak ratio of the optical power densities of the blue light and the light of the other colors is smaller than that of the blue light and the light of the other colors in the first mode.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (12)
1. A projection device, comprising:
a light source device for emitting light source light including blue light and other color light; and
a spatial light modulator for modulating the source light in accordance with image data to generate image light,
wherein, for the same image data, the projection apparatus has a first mode and a second mode, the luminous flux of the other color light emitted by the light source device when the projection apparatus is in the second mode is larger than the luminous flux of the other color light emitted by the light source device when the projection apparatus is in the first mode, and when the projection apparatus is in the second mode, the luminous flux proportion of the other color light in the light source light is larger than the luminous flux proportion of the other color light in the light source light when the projection apparatus is in the first mode.
2. The projection apparatus as claimed in claim 1, wherein the other color light includes a first color light, and a luminous flux of the first color light emitted by the light source device when the projection apparatus is in the second mode is larger than a luminous flux of the first color light emitted by the light source device when the projection apparatus is in the first mode.
3. The projection device of claim 2, wherein a photopic vision spectral luminous efficacy of a peak wavelength of the first color light is greater than a photopic vision spectral luminous efficacy of a peak wavelength of the blue light.
4. The projection apparatus of claim 2, wherein the other color light includes a second color light, a luminous flux of the second color light emitted by the light source device when the projection apparatus is in the second mode is greater than a luminous flux of the second color light emitted by the light source device when the projection apparatus is in the first mode, wherein the first color light is red light and the second color light is green light or the first color light is green light and the second color is red light.
5. The projection device of claim 1, wherein a luminous flux of the blue light emitted by the light source arrangement when the projection device is in the second mode is small compared to a luminous flux of the blue light emitted by the light source arrangement when the projection device is in the first mode.
6. The projection device of claim 4, wherein a ratio of a peak optical power density of the blue light emitted by the light source apparatus when the projection device is in the second mode to a peak optical power density of the first color light or the second color light is smaller than a ratio of a peak optical power density of the blue light to a peak optical power density of the first color light or the second color light when the light source apparatus is in the first mode.
7. The projection apparatus according to any of claims 2-4 and 6, further comprising a light source driver for emitting a driving signal to control a driving current of the light source device to control the other color light emitted by the light source device, wherein the driving current of the light source device comprises a first driving current to control the blue light and a second driving current to control the first color light.
8. The projection device of claim 7, wherein a current value of the first drive current of the light source arrangement when the projection device is in the second mode is less than a current value of the first drive current of the light source arrangement when the projection device is in the first mode; or the pulse width of the first driving current of the light source device when the projection device is in the second mode is smaller than the pulse width of the first driving current of the light source device when the projection device is in the first mode.
9. The projection device of claim 7, wherein a current value of the second drive current of the light source arrangement when the projection device is in the second mode is greater than a current value of the second drive current of the light source arrangement when the projection device is in the first mode; or the pulse width of the second driving current of the light source device when the projection device is in the second mode is larger than the pulse width of the second driving current of the light source device when the projection device is in the first mode.
10. The projection device of any of claims 2-4, 6, wherein the projection device further comprises an auxiliary light source for emitting an auxiliary color light, the auxiliary color light being non-blue light; when the projection equipment is in a first mode, the auxiliary light source is not started, and when the projection equipment is in a second mode, the auxiliary light source is started.
11. The projection device of claim 10, wherein the auxiliary color light is of the same color as the first color light, and wherein a full width at half maximum of a spectrum of the auxiliary color light is no greater than 20 nm.
12. The projection device of claim 1, wherein: when the projection device is in the second mode, the power proportion of the blue light in the light source light is less than 20%, and the ratio of the peak value of the optical power density of the other color light to the peak value of the optical power density of the blue light is greater than or equal to 50%.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711276687.1A CN109884845B (en) | 2017-12-06 | 2017-12-06 | Projection device |
| PCT/CN2018/074724 WO2019109506A1 (en) | 2017-12-06 | 2018-01-31 | Projection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711276687.1A CN109884845B (en) | 2017-12-06 | 2017-12-06 | Projection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109884845A CN109884845A (en) | 2019-06-14 |
| CN109884845B true CN109884845B (en) | 2021-10-26 |
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| CN201711276687.1A Active CN109884845B (en) | 2017-12-06 | 2017-12-06 | Projection device |
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| CN112687216B (en) * | 2020-12-28 | 2022-05-24 | 青岛海信激光显示股份有限公司 | Laser projection apparatus and control method thereof |
| CN112687215B (en) * | 2020-12-28 | 2022-06-07 | 青岛海信激光显示股份有限公司 | Laser projection apparatus and control method thereof |
| CN114995037A (en) * | 2022-06-30 | 2022-09-02 | 青岛海信激光显示股份有限公司 | Projection apparatus and driving method of light source thereof |
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| WO2019109506A1 (en) | 2019-06-13 |
| CN109884845A (en) | 2019-06-14 |
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