WO2019109507A1

WO2019109507A1 - Projection device

Info

Publication number: WO2019109507A1
Application number: PCT/CN2018/074725
Authority: WO
Inventors: 杨佳翼; 陈红运; 李屹
Original assignee: 深圳光峰科技股份有限公司
Priority date: 2017-12-06
Filing date: 2018-01-31
Publication date: 2019-06-13
Also published as: CN109884850B; CN109884850A

Abstract

The present invention relates to a projection device. The projection device has a first mode and a second mode. The projection device comprises a light source apparatus and a spatial light modulator. The light source apparatus is used for emitting light-source light, the light-source light comprising blue light and light of other colors. The spatial light modulator is used for modulating the light-source light according to image data to produce image light. The proportion of the power of the blue light, emitted by the light source apparatus in the second mode, in the emitted light-source light is less than the proportion of the power of the blue light, emitted by the light source apparatus in the first mode, in the emitted light-source light.

Description

Projection equipment

Technical field

The present invention relates to the field of projection display technologies, and in particular, to a projection device.

Background technique

According to research, the effects of blue light on human eyes are as follows: 1. High blue light content will cause increased visual fatigue, and second, affect eye physiological development. 3. Long-term exposure in such light environment. The possibility of macular degeneration in the human eye will increase. In view of this, how to improve the damage of blue light to the human eye is an important issue in the field of projection display. As today's Blu-ray hazards are gaining more and more attention, countries have also begun to develop relevant safety standards for Blu-ray hazards to reduce the blue light hazard in products.

technical problem

In particular, in the field of laser projection, laser projection is more and more popular because of its long life and high brightness. However, the current source of excitation projection generally uses a blue laser source to provide a blue light source while using blue. The technique of laser excitation of wavelength converting materials produces the light of other colors required, for example, using a blue laser to excite the green wavelength converting material to produce the desired green light, exciting the red wavelength converting material to produce the desired red light, and exciting the yellow wavelength conversion. The material produces red, green, and the like. Therefore, in a white light source in which laser and fluorescence are mixed, the bandwidth of the blue light is narrow and the blue light power may be higher in the entire visible light spectral range, and the ratio of the peak value of the non-blue light spectrum to the peak of the blue light spectrum may also be small, resulting in damage to the human eye. It may be larger and it is necessary to improve.

Technical solution

In order to solve the technical problem that the existing projection device blue light causes damage to the human eye, the present invention provides a projection device capable of improving the damage caused by blue light to the human eye.

A projection device having a first mode and a second mode, the projection device comprising:

a light source device for emitting light source light, the light source light comprising blue light and other color light;

a spatial light modulator for modulating the light source light according to image data to generate image light,

Wherein the ratio of the power of the blue light emitted by the light source device in the second mode to the emitted light is compared to the blue light emitted by the light source device in the first mode. The power in the light source is small in proportion.

Beneficial effect

Compared with the prior art, the projection apparatus of the present invention has two projection modes of a first mode and a second mode, and the blue light emitted by the light source device in the second mode is emitted in the emitted light. The power ratio is smaller than the power ratio of the blue light emitted by the light source device in the first mode in the emitted light, so that the projection device can be in the second mode. The proportion of blue image light can be reduced, thereby reducing the harm of blue light to the human eye and achieving the purpose of eye protection.

DRAWINGS

1 is a schematic structural view of a projection apparatus according to a first embodiment of the present invention.

Fig. 2 is a waveform diagram showing driving current values of respective color lights in the first embodiment of the projection apparatus shown in Fig. 1.

Fig. 3 is a waveform diagram showing driving current values of respective color lights in the second embodiment of the projection apparatus shown in Fig. 1.

Fig. 4 is a waveform diagram showing driving current values of respective color lights in a third embodiment of the projection apparatus shown in Fig. 1.

Fig. 5 is a waveform diagram showing driving current values of respective color lights in the fourth embodiment of the projection apparatus shown in Fig. 1.

Fig. 6 is a waveform diagram showing driving current values of respective color lights in the fifth embodiment of the projection apparatus shown in Fig. 1.

Fig. 7 is a waveform diagram showing driving current values of respective color lights in the sixth embodiment of the projection apparatus shown in Fig. 1.

Fig. 8 is a waveform diagram showing driving current values of respective color lights in the seventh embodiment of the projection apparatus shown in Fig. 1.

9 is a schematic structural view of a projection apparatus according to a second embodiment of the present invention.

Fig. 10 is a schematic view showing the spectrum of blue light emitted from the light source device of the projection apparatus shown in Fig. 9.

Fig. 11 is a schematic view showing the spectrum of light source light emitted from a light source device of a projection apparatus that does not satisfy the eye protection requirements.

Figure 12 is a block diagram showing the structure of a projection apparatus according to a third embodiment of the present invention.

Fig. 13 is a schematic view showing the spectrum of blue light emitted from the light source device of the projection apparatus shown in Fig. 12.

Figure 14 is a graph of the retinal hazard weighting function of light of different wavelengths to the human eye.

主要元件符号说明Main component symbol description

Projection device 100, 200, 300

Light source device 110, 210, 310

Light source driver 120

Spatial light modulator 130

Lens 140

The invention will be further illustrated by the following detailed description in conjunction with the accompanying drawings.

Embodiments of the invention

Please refer to FIG. 1. FIG. 1 is a schematic structural diagram of a projection apparatus 100 according to a first embodiment of the present 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 projection display modes, a first mode and a second mode, when in operation. It can be understood that the switching between the first mode and the second mode can be implemented by the user operating the mechanical button or the interface operation menu displayed by the projection device 100, and details are not described herein. The first mode may be a normal mode, that is, a normal display mode, and the second mode is an eye protection mode, that is, a mode different from the normal mode and beneficial to human eye protection.

The light source device 110 is for emitting light source light, the light source light includes blue light and other color lights, and the other color lights include red light and green light. The ratio of the power of the blue light emitted by the light source device 110 when the projection device 100 is in the second mode is the light source light emitted by the light source device 110 when the projection device 100 is in the first mode. The power ratio is small. Specifically, in the present embodiment, the light source device 110 may include a blue laser light source for emitting blue light.

The light source driver 120 is configured to emit a drive signal to control the drive current of the light source device 110, thereby controlling the power ratio of the blue light in the light source light. The driving current of the light source device 110 includes a first driving current for controlling blue light and other color light driving currents for controlling light intensity of other colors, and the other color light driving current includes a second driving current for controlling red light intensity and controlling green light intensity. The third drive current. It can be understood that, in one embodiment, the blue excitation light is used to emit the blue excitation light to excite the phosphor, the second driving current is actually the driving current for driving the blue excitation light source, and the third driving current is actually The driving current of the blue excitation light source is driven. In addition, the blue light may also use a part of the blue excitation light emitted by the blue excitation light source. Therefore, the first driving current may be a blue driving current for driving the blue excitation light source. However, in another embodiment, if the ultraviolet excitation light source emits ultraviolet light to excite the phosphor to generate blue light and other color light, the first, second, and third driving currents may respectively be ultraviolet light that drives the ultraviolet excitation light source. Drive current.

Referring to FIG. 2, in the first embodiment, the light source device 110 has a current value of the other color light driving current when the projection device 100 is in the second mode is greater than other colors of the light source device 110 when the projection device 100 is in the first mode. The current value of the light drive current. Specifically, the current value of the second driving current of the light source device 110 when the projection device 100 is in the second mode is greater than the current value of the second driving current when the light source device 110 is in the first mode, and the light source device 110 is The current value of the third driving current when the projection device 100 is in the second mode is greater than the current value of the third driving current of the light source device 110 when the projection device 100 is in the first mode. At this time, the current value of the first driving current of the light source device 110 when the projection device 100 is in the second mode may be equal to the current value of the first driving current of the light source device 110 when the projection device 100 is in the first mode.

Referring to FIG. 3, in the second embodiment, the current value of the light source driving current of the light source device 110 when the projection device 100 is in the second mode is greater than the other colors of the light source device 110 when the projection device 100 is in the first mode. The current value of the light drive current. Specifically, the current value of the second driving current of the light source device 110 when the projection device 100 is in the second mode is greater than the current value of the second driving current when the light source device 110 is in the first mode. At this time, the current value of the first driving current of the light source device 110 when the projection device 100 is in the second mode may be equal to the current value of the first driving current when the light source device is in the first mode; the light source device 110 is at the projection device 100 The current value of the third driving current in the two mode may be equal to the current value of the third driving current of the light source device 110 when the projection device 100 is in the first mode.

Referring to FIG. 4, in the third embodiment, the light source device 110 has a current value of the other color light driving current when the projection device 100 is in the second mode is greater than other colors of the light source device 110 when the projection device 100 is in the first mode. The current value of the light drive current. Specifically, the current value of the third driving current of the light source device 110 when the projection device 100 is in the second mode is greater than the current value of the third driving current of the light source device 110 when the projection device 100 is in the first mode. At this time, the current value of the first driving current of the light source device 110 when the projection device 100 is in the second mode may be equal to the current value of the first driving current when the light source device 110 is in the first mode; the light source device 110 is The current value of the second driving current when the projection device 100 is in the second mode may be equal to the current value of the second driving current of the light source device 110 when the projection device 100 is in the first mode.

Referring to FIG. 5 , in the fourth embodiment, the current value of the first driving current of the light source device 110 when the projection device 100 is in the second mode is smaller than the first driving of the light source device 110 when the projection device 100 is in the first mode. The current value of the current. At this time, the current value of the light source driving current of the light source device 110 when the projection device 100 is in the second mode may be equal to the current value of the other color light driving current of the light source device 110 when the projection device 100 is in the first mode. Specifically, the current value of the second driving current of the light source device 110 when the projection device 100 is in the second mode may be equal to the current value of the second driving current of the light source device 110 when the projection device 100 is in the first mode, and the light source device 110 is The current value of the third driving current when the projection device 100 is in the second mode is equal to the current value of the third driving current of the light source device 110 when the projection device 100 is in the first mode.

Referring to FIG. 6 , in the fifth embodiment, the current value of the first driving current of the light source device 110 when the projection device 100 is in the second mode is smaller than the first driving of the light source device 110 when the projection device 100 is in the first mode. The current value of the current. At this time, the current value of the light source driving current of the light source device 110 when the projection device 100 is in the second mode is greater than the current value of the other color light driving current of the light source device 110 when the projection device 100 is in the first mode. Specifically, the current value of the second driving current of the light source device 110 when the projection device 100 is in the second mode may be greater than the current value of the second driving current when the light source device is in the first mode, and the light source device 110 is at the projection device 100 The current value of the third driving current in the two mode may be greater than the current value of the third driving current of the light source device 110 when the projection device 100 is in the first mode.

Referring to FIG. 7 , in the sixth embodiment, the current value of the first driving current of the light source device 110 when the projection device 100 is in the second mode is smaller than the first driving of the light source device 110 when the projection device 100 is in the first mode. The current value of the current. At this time, the current value of the light source driving current of the light source device 110 when the projection device 100 is in the second mode is greater than the current value of the other color light driving current of the light source device 110 when the projection device 100 is in the first mode. Specifically, the current value of the second driving current of the light source device 110 when the projection device 100 is in the second mode may be greater than the current value of the second driving current when the light source device is in the first mode, and the light source device 110 is at the projection device 100 The current value of the third driving current in the two mode may be equal to the current value of the third driving current of the light source device 110 when the projection device 100 is in the first mode.

Referring to FIG. 8 , in the seventh embodiment, the current value of the first driving current of the light source device 110 when the projection device 100 is in the second mode is smaller than the first driving of the light source device 110 when the projection device 100 is in the first mode. The current value of the current. At this time, the current value of the light source driving current of the light source device 110 when the projection device 100 is in the second mode is greater than the current value of the other color light driving current of the light source device 110 when the projection device 100 is in the first mode. Specifically, the current value of the second driving current of the light source device 110 when the projection device 100 is in the second mode may be equal to the current value of the second driving current of the light source device 110 when the projection device 100 is in the first mode, and the light source device 110 is The current value of the third driving current when the projection device 100 is in the second mode may be greater than the current value of the third driving current of the light source device 110 when the projection device 100 is in the first mode.

Further, in the embodiment, the light source driver 120 sends a driving signal to control the light output of the light source device 110, so that when the projection device 100 is in the second mode, the power ratio of the blue light in the light source light is less than 20%. The ratio of the peak value of other color light to the peak value of blue light is 50% or more to achieve a better eye protection effect.

The spatial light modulator 130 is operative to modulate the source light in accordance with the image data to produce 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 or the like to display the projected image.

The spatial light modulator 130 can be monolithic, two-piece or three-chip. When it is a monolithic spatial light modulator, the red, green and blue light timings enter the spatial light modulator, and the spatial light The modulator timing modulates out three colors of light; when it is a two-piece spatial light modulator, one spatial light modulator can modulate blue light and green light, and the other spatial light modulator modulates red light; In the case of a slice-type spatial light modulator, red, green, and blue light respectively enter three spatial light modulators, and the three colors of light do not need to be time-series modulated. The spatial light modulator 130 can be a DMD, an LCD, or the like.

Compared with the prior art, in the projection apparatus 100 of the present invention, the projection apparatus 100 has two modes of the second mode and the first mode, and the blue light emitted by the light source device 110 when the projection device 100 is in the second mode is emitted. The power ratio in the light source light is smaller than the power ratio of the blue light emitted by the light source device 110 when the projection device 100 is in the first mode, and the projection device 100 can be in the second mode. The proportion of blue image light can be reduced, thereby reducing the harm of blue light to the human eye and achieving the purpose of eye protection.

Further, in the second mode, the power ratio of the blue light in the light source light may be less than 20%, and the ratio of the peak value of the other color light to the peak value of the blue light may be greater than or equal to 50%, thereby effectively improving the blue to human The damage caused by the eye reaches the purpose of eye protection.

In addition, in the first modified embodiment of the first embodiment, under the control of the driving signal emitted by the light source driver 120, the pulse width of the light source driving current of the light source device 110 when the projection device 100 is in the second mode may be The pulse width of the light driving current of the other color light source device 110 when the projection device 100 is in the first mode can also reduce the proportion of blue image light, thereby reducing the harm of blue light to the human eye and achieving the purpose of eye protection. .

Further, it can be understood that, in the first embodiment of the first modified embodiment, the pulse width of the second driving current of the light source device 110 when the projection device 100 is in the second mode is greater than the light source device 110 is at the projection device 100. The pulse width of the second driving current in the first mode, the pulse width of the third driving current of the light source device 110 when the projection device 100 is in the second mode is greater than the third driving of the light source device 110 when the projection device 100 is in the first mode The pulse width of the current. The pulse width of the first driving current of the light source device 110 when the projection device 100 is in the second mode is equal to the pulse width of the first driving current of the light source device 110 when the projection device 100 is in the first mode.

In a second embodiment of the first modified embodiment, the pulse width of the second driving current of the light source device 110 when the projection device 100 is in the second mode is greater than when the light source device 110 is in the first mode when the projection device 100 is in the first mode. The pulse width of the two driving currents, the pulse width of the third driving current of the light source device 110 when the projection device 100 is in the second mode is equal to the pulse width of the third driving current of the light source device 110 when the projection device 100 is in the first mode. The pulse width of the first driving current of the light source device 110 when the projection device 100 is in the second mode is equal to the pulse width of the first driving current of the light source device 110 when the projection device 100 is in the first mode.

In a third embodiment of the first modified embodiment, the pulse width of the second driving current when the projection device 100 is in the second mode is equal to the number of the light source device 110 when the projection device 100 is in the first mode. The pulse width of the two driving currents, the pulse width of the third driving current of the light source device 110 when the projection device 100 is in the second mode is greater than the pulse width of the third driving current of the light source device 110 when the projection device 100 is in the first mode. The pulse width of the first driving current of the light source device 110 when the projection device 100 is in the second mode is equal to the pulse width of the first driving current of the light source device 110 when the projection device 100 is in the first mode.

In addition, in the second modified embodiment of the first embodiment, under the control of the driving signal from the light source driver 120, the pulse width of the first driving current of the light source device 110 when the projection device 100 is in the second mode is smaller than the light source. The pulse width of the first driving current of the device 110 when the projection device 120 is in the first mode can also reduce the proportion of blue image light, thereby reducing the harm of the blue light to the human eye and achieving the purpose of eye protection.

Further, it can be understood that, in the first embodiment of the second modified embodiment, the pulse width of the first driving current of the light source device 110 when the projection device 100 is in the second mode is smaller than the light source device 110 at the projection device 100. a pulse width of the first driving current when in the first mode, and a pulse width of the second driving current of the light source device 110 when the projection device 100 is in the second mode is equal to the second time when the light source device 110 is in the first mode when the projection device 100 is in the first mode The pulse width of the driving current, the pulse width of the third driving current of the light source device 110 when the projection device 100 is in the second mode is equal to the pulse width of the third driving current of the light source device 110 when the projection device 100 is in the first mode.

In a second embodiment of the second modified embodiment, the pulse width of the first driving current when the projection device 100 is in the second mode is smaller than when the projection device 100 is in the first mode when the projection device 100 is in the first mode. a pulse width of a driving current, a pulse width of the second driving current of the light source device 110 when the projection device 100 is in the second mode is greater than a pulse width of the second driving current of the light source device 110 when the projection device 100 is in the first mode, the light source The pulse width of the third drive current of the device 110 when the projection device 100 is in the second mode is equal to the pulse width of the third drive current of the light source device 110 when the projection device 100 is in the first mode.

In a third embodiment of the second modified embodiment, the pulse width of the first driving current when the projection device 100 is in the second mode is smaller than when the projection device 100 is in the first mode. a pulse width of a driving current, a pulse width of the second driving current when the projection device 100 is in the second mode is equal to a pulse width of the second driving current when the light source device is in the first mode, and the light source device 110 is at the projection device The pulse width of the third drive current when the 100 is in the second mode is greater than the pulse width of the third drive current when the light source device 110 is in the first mode.

In a fourth embodiment of the second modified embodiment, the pulse width of the first driving current of the light source device 110 when the projection device 100 is in the second mode is smaller than when the light source device 110 is in the first mode when the projection device 100 is in the first mode. a pulse width of a driving current, a pulse width of the second driving current of the light source device 110 when the projection device 100 is in the second mode is greater than a pulse width of the second driving current of the light source device 110 when the projection device 100 is in the first mode, the light source The pulse width of the third driving current of the device 110 when the projection device 100 is in the second mode is greater than the pulse width of the third driving current of the light source device 110 when the projection device 100 is in the first mode.

Please refer to FIG. 9. FIG. 9 is a schematic structural diagram of a projection apparatus 200 according to a second embodiment of the present invention. The projection apparatus 200 of the second embodiment is basically the same as the projection apparatus 100 of the above-described first embodiment and its modified embodiment, that is, the description of the projection apparatus 100 of the first embodiment and its modified embodiment can basically be described. Applicable to the projection apparatus 200 of the second embodiment, the main difference between the two is that the light source device 210 is different.

Specifically, in the second embodiment, the light source device 210 includes a plurality of blue light sources, and the blue light emitted by the plurality of blue light sources has different wavelength ranges. Specifically, the plurality of blue light sources may all be blue laser light sources, such as blue light emitted by the light source device 210 for emitting the first blue light, the second blue light, and the third blue light, respectively. Please refer to FIG. 10 , FIG. 10 is FIG. 9 . A schematic diagram of the blue light emitted by the light source device of the projection device 200, the dominant wavelengths of the first blue light, the second blue light, and the third blue light may each be greater than 460 nanometers, so that the dominant wavelength of the blue light emitted by the light source device 210 is greater than 460. Nano. Further, the peaks of the first blue light, the second blue light, and the third blue light are both smaller than the peak value of the blue light of the first embodiment, specifically, the peaks of the other color lights (such as red light or green light) and the first blue light, The ratio of any one of the peaks of the second blue light and the third blue light may be 50% or more. Further, compared with the prior art, please refer to FIG. 11. FIG. 11 is a schematic diagram of the spectrum of the light source emitted by the light source device of the projection device that does not satisfy the eye protection requirements. It can be seen from Fig. 11 that the peak value of blue light is high, especially the ratio of the peak value of other color light (such as red light, green light) to the peak value of blue light is less than 50%, and such a projection apparatus is difficult to meet the requirements of eye protection. . However, according to FIG. 10, in the second embodiment, since the spectrum of the blue light emitted from the light source device 200 is wide and the peak value is small, it is easier to achieve the purpose of reducing blue light and protecting the human eye.

Referring to FIG. 12, FIG. 12 is a schematic structural diagram of a projection apparatus 300 according to a third embodiment of the present invention. The projection apparatus 300 of the third embodiment is basically the same as the projection apparatus 100 of the above-described first embodiment and its modified embodiment, that is, the above description of the projection apparatus 100 of the first embodiment and its modified embodiment is basically The main difference between the two is that the light source device 310 differs in the projection device 300 of the third embodiment.

Specifically, in the second embodiment, the light source device 310 includes a blue LED light source for emitting blue light, please refer to FIG. 13, which is a blue light emitted by the light source device of the projection device 300 shown in FIG. The schematic diagram of the spectrum, the dominant wavelength of the blue light may be greater than 460 nm, and further, the peak of the blue light is smaller than the peak of the blue light of the first embodiment, specifically, other color light (such as red light or green light) The ratio of the peak value to the peak value of the blue light may be 50% or more.

In the third embodiment, since the blue light emitted from the light source device 310 has a wide spectrum and a small peak value, it is easier to achieve the purpose of reducing blue light and protecting the human eye.

Still further, please refer to FIG. 14, which is a graph of a retinal hazard weighting function of light of different wavelengths to the human eye. According to FIG. 14, in the second and third embodiments, the main wavelengths of the blue light emitted by the light source devices 210 and 310 are both greater than 460 nm, and a better eye protection effect can be achieved.

The above is only the embodiment of the present invention, and is not intended to limit the scope of the invention, and the equivalent structure or equivalent process transformation of the present invention and the contents of the drawings may be directly or indirectly applied to other related technical fields. The same is included in the scope of patent protection of the present invention.

Claims

A projection device, wherein the projection device has a first mode and a second mode, the projection device comprising:

2. The projection apparatus according to claim 1, wherein the projection apparatus further comprises a light source driver for emitting a driving signal for controlling a driving current of the light source device, thereby controlling the blue light to be The power ratio of the light source light, wherein the driving current of the light source device includes a first driving current that controls the blue light and other color light driving currents that control the intensity of the other color light.

The projection apparatus according to claim 2, wherein a current value of the other color light driving current of the light source device in the second mode is greater than the other value of the light source device in the first mode The current value of the color light drive current.

4. The projection apparatus according to claim 3, wherein said other color light comprises red light and green light, and said other color light drive current comprises a second drive current and a control station for controlling said red light intensity a third driving current of the green light intensity, wherein the current value of the second driving current when the light source device is in the second mode is greater than the current value of the second driving current when the light source device is in the first mode And/or the current value of the third driving current when the light source device is in the second mode is greater than the current value of the third driving current when the light source device is in the first mode.

The projection apparatus according to claim 2, 3 or 4, wherein the current value of the first driving current of the light source device in the second mode is smaller than when the light source device is in the first mode The current value of the first driving current.

The projection apparatus according to claim 2, wherein a pulse width of said other color light driving current of said light source device in said second mode is greater than said other color of said light source device in said first mode The pulse width of the color light drive current.

7. The projection apparatus of claim 6, wherein the other color light comprises red light and green light, the other color light drive current comprises a second drive current for controlling the red light and controlling the a third driving current of the green light, wherein a pulse width of the second driving current of the light source device in the second mode is greater than a pulse width of the second driving current of the light source device in the first mode and/or The pulse width of the third driving current of the light source device in the second mode is greater than the pulse width of the third driving current when the light source device is in the first mode.

The projection apparatus according to claim 2, 6 or 7, wherein a pulse width of the first driving current of the light source device in the second mode is smaller than when the light source device is in the first mode a pulse width of the first drive current.

The projection apparatus according to claim 1 or 2, wherein the light source device comprises a blue light source, the blue light source emits the blue light, and the blue light source comprises a plurality of blue laser light sources having different wavelength ranges Or the blue light source comprises an LED light source.

The projection apparatus according to claim 1, wherein in the second mode, a power ratio of the blue light in the light source light is less than 20%, and a peak of the other color light and the blue color The ratio of the peak value of the color light is greater than or equal to 50%.