WO2019109505A1

WO2019109505A1 - Projection device and projection display method

Info

Publication number: WO2019109505A1
Application number: PCT/CN2018/074723
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: CN109889801A

Abstract

A projection device and a projection display method. The projection device (100) comprises a light source apparatus (110), a controller (120) and a spatial light modulator (130). The light source apparatus (110) emits light-source light, and the light-source light comprises blue light (B) and light of other colors (R, G). The controller (120) receives, when in a second mode, original image data of an image to be displayed and generates corrected image data, wherein the original image data comprises an original gray-scale value of a blue color and original gray-scale values of other colors, the corrected image data comprises a corrected gray-scale value of the blue color corresponding to the original gray-scale value of the blue color and/or corrected gray-scale values of the other colors corresponding to the original gray-scale values of the other colors, and the corrected grayscale value of the blue color is lower than the original gray-scale value of the blue color and/or the corrected gray-scale values of the other colors are higher than the original gray-scale values of the other colors. The spatial light modulator (130) modulates, when in the second mode, the light-source light according to the corrected image data to produce image light.

Description

Projection device and projection display method

Technical field

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

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-excited phosphor produces the light of other colors required, for example, using a blue laser to excite the green fluorescent material to produce the desired green light, exciting the red fluorescent material to produce the desired red light, and exciting the yellow fluorescent material to produce the desired Red light and green light, etc. 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 and a projection display method which can improve 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 controller, configured to generate corrected image data according to original image data of an image to be displayed in a second mode, the original image data including blue original grayscale values and other color original grayscale values, the corrected image data including corresponding a blue corrected grayscale value of the blue original grayscale value and/or other color corrected grayscale values corresponding to the other color original grayscale value, the blue corrected grayscale value being compared to the blue The original grayscale value is low and/or the other color corrected grayscale values are higher than the other color original grayscale values; and

a spatial light modulator for modulating the source light to generate image light according to the original image data in a first mode, and modulating the source light to generate image light according to the corrected image data in a second mode.

A projection display method for a projection device having a first mode and a second mode, the projection display method comprising the steps of:

Providing light source light, the light source light comprising blue light and other color light;

Receiving original image data of an image to be displayed, the original image data including blue original grayscale values and other color original grayscale values;

Modulating the light source light to generate image light according to the original image data in the first mode; and

Producing corrected image data according to the original image data in the second mode and modulating the light source light to generate image light according to the corrected image data, the corrected image data including blue correction corresponding to the blue original grayscale value Grayscale values and/or other color corrected grayscale values corresponding to the original grayscale values of the other colors, the blue corrected grayscale values being lower than the blue original grayscale values and/or the other colors The corrected grayscale value is higher than the other grayscale original grayscale values.

Beneficial effect

Compared with the prior art, in the projection apparatus and the projection display method of the present invention, the projection apparatus has two modes of a second mode and a first mode, and in the second mode, the corrected image data is generated according to the original image data. Modulating the source light to generate image light according to the corrected image data, wherein the blue corrected grayscale value is lower than the blue original grayscale value and/or the other color in the corrected image data The corrected grayscale value is higher than the original grayscale value of the other colors, so that the proportion of the blue image light is reduced in the second mode, thereby reducing the harm of the blue light to the human eye, and achieving the purpose of eye protection. .

DRAWINGS

1 is a block diagram showing the structure of a projection apparatus according to a first embodiment of the present invention.

2 is a block diagram showing the structure of a projection apparatus according to a second embodiment of the present invention.

3 is a flow chart of a projection display method in accordance with a preferred embodiment of the present invention.

主要元件符号说明Main component symbol description

Projection equipment 100, 200

Light source device 110, 210

Controller 120, 220

Spatial light modulator 130, 230

Lens 140

Steps S1, S2, S3, S4

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 block diagram showing the structure of a projection apparatus 100 according to a first embodiment of the present invention. The projection device 100 includes a light source device 110, a controller 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 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 capable of realizing human eye protection.

The light source device 110 is for emitting light source light, and the light source light includes blue light (such as B) and other color lights, wherein the other color lights include red light and green light (such as R, G). It can be understood that the light source device 110 can respectively emit (for example, time-sequentially emitting) blue light, red light, and green light, or simultaneously emit any two of blue light, red light, and green light, or simultaneously emit blue light and red light. And green light three kinds of light.

Specifically, the light source device 110 may include an excitation light source and a color wheel having a phosphor, such as a blue laser light source as an excitation light source to provide blue light, and a blue laser excitation phosphor technology to generate other color light required (eg, Red light and green light). Among them, it can be understood that in one embodiment, when a yellow phosphor is used, red light and green light can be simultaneously emitted. Further, when the projection device 100 is in the second mode, the power of the blue light emitted by the light source device 110 is less than 20% of the power of the light source light, and the peak of other color light emitted by the light source device 110 (such as red light) The peak value of the peak or green light) is greater than or equal to 50% of the peak value of the blue light. Of course, in an embodiment, when the projection device 100 is in the normal mode, the power of the blue light emitted by the light source device 110 may be less than 20% in the power of the light source light, and other color lights emitted by the light source device 110. The peak value (such as the peak of red light or the peak of green light) and the peak value of blue light may also be greater than or equal to 50%.

The controller 120 is configured to generate corrected image data according to original image data of the image to be displayed when the projection device 100 is in the second mode, the original image data includes a blue original grayscale value and other color original grayscale values, and the corrected image data includes a corresponding The blue corrected grayscale value of the blue original grayscale value and/or the other color corrected grayscale value corresponding to the original grayscale value of the other color, the blue corrected grayscale value is lower than the blue original grayscale value and/or Other color correction grayscale values are higher than other color original grayscale values. Specifically, the blue corrected grayscale value may be 1/2, or 1/3 of the blue original grayscale value. For example, if the blue original grayscale value is 255, the blue corrected grayscale value may be 128.

In an embodiment, the controller 120 may receive original image data provided by other circuits (such as interface circuits, video processing circuits, image processing circuits, external image sources, etc.) in the first mode and provide the original image data to the space. The light modulator, the controller 120 may also receive the raw image data in the second mode and convert the raw image data into corrected image data and output the corrected image data to the spatial light modulator.

In another embodiment, the controller 120 can also be turned off (ie, not working) in the first mode, so that the spatial light modulator 130 directly receives other circuits (such as interface circuits, video processing circuits, image processing circuits, external images). Source or the like outputting the original image data and modulating the source light to generate the image light according to the original image data, and the controller 120 may further receive the original image data output by the other circuit in the second mode, and convert the original image data into the corrected image data, And outputting the corrected image data to the spatial light modulator 130.

The spatial light modulator 130 is configured to modulate the source light to generate image light according to the original image data when the projection device 100 is in the first mode, and to modulate the source light to generate image light according to the corrected image data when the projection device 100 is in the second mode. The lens 140 receives the image light generated by the spatial light modulator 1360 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.

When the projection device 100 is in the first mode, the spatial light modulator 130 respectively generates blue image light according to the blue original grayscale value and the other color original grayscale values and correspondingly modulate the blue light and other color light emitted by the light source device 110. And other color image light, such as modulating blue light according to blue original gray scale value, modulating red light according to red original gray scale value, and modulating green light according to green original gray scale value.

When the projection device 100 is in the second mode, the spatial light modulator 130 modulates the blue light according to the blue corrected grayscale value to produce blue image light and/or modulates the other color light according to other color corrected grayscale values to produce other color image light.

Specifically, in the first embodiment, the corrected image data may include a blue corrected grayscale value corresponding to the blue original grayscale value and other color original grayscale values, that is, the controller may only focus on the blue original grayscale The values are converted to produce corresponding blue corrected grayscale values, but the original grayscale values of other colors (such as red original grayscale values and green original grayscale values) are not adjusted to correct bluescale grayscale values and other colors. The corrected image data composed of the original grayscale values is output to the spatial light modulator. Therefore, when the projection device 100 is in the second mode, the spatial light modulator 130 may modulate the blue light according to the blue corrected grayscale value to generate blue image light, and modulate the other color light according to other color original grayscale values to generate other color images. Light. It can be understood that the other color original grayscale values include the red original grayscale value and the green original grayscale value. When the projection device 100 is in the second mode, the spatial light modulator 130 modulates the red light according to the red original grayscale value to generate red image light. And modulating green light according to the green original grayscale value to produce green image light. In detail, it can be understood that each frame of the original image data includes original image data of a plurality of pixels, such as original image data of each pixel including blue original grayscale values and other color original grayscale values (such as red original gray) The step value and the green original gray scale value), if the original image data of one pixel includes the blue original gray scale value, the red original gray scale value and the green original gray scale value are respectively 255, 255, 255, in the first embodiment, the controller generates The corrected image data includes blue corrected grayscale values, red original grayscale values, and green original grayscale values, such as 128, 255, and 255, respectively.

Further, in the second embodiment, the corrected image data includes a blue corrected grayscale value corresponding to the blue original grayscale value and other color corrected grayscale values corresponding to the other color original grayscale values, and the projection device 100 is at In the second mode, the spatial light modulator 130 modulates the blue light according to the blue corrected grayscale value to generate blue image light, and modulates the other color light according to other color correction grayscale values to generate other color image light.

Further, in the third embodiment, the corrected image data includes blue original grayscale values and other color corrected grayscale values corresponding to other color original grayscale values, and the spatial light modulator 130 is in the second projection device 100. In the mode, blue light is modulated according to the blue original gray scale value to generate blue image light, and other color light is modulated according to other color correction gray scale values to generate other color image light.

Wherein, in the second and third implementations, the original grayscale values of the other colors include a red original grayscale value and a green original grayscale value, and the corrected grayscale values of the other colors include corresponding red corrected grayscale values and/or green Correcting the grayscale value, wherein the red corrected grayscale value is higher than the corresponding red original grayscale value and/or the green corrected grayscale value is higher than the corresponding green original grayscale value, and the spatial light modulator 130 is in the projection device When the 100 is in the second mode, the red and green lights are respectively modulated according to the red original grayscale value and the green corrected grayscale value, the red corrected grayscale value and the green original grayscale value, or the red corrected grayscale value and the green corrected grayscale value respectively. Produces red image light and green image light.

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 a second mode and a first mode, and in the second mode, the corrected image data is generated according to the original image data and the corrected image data is generated. Modulating the source light to generate image light, since the blue corrected grayscale value is lower than the blue original grayscale value and/or the other color corrected grayscale value is higher than other color original grayscale values in the corrected image data, 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, the power of the blue light emitted by the light source device 110 is less than 20% in the power of the light source light, and the peaks of other color lights emitted by the light source device 110 (such as the peak of red light or the peak of green light) and blue The ratio of the peak value of the color light is greater than or equal to 50%, which can also effectively improve the damage caused by blue to the human eye and achieve the purpose of eye protection.

Please refer to FIG. 2. FIG. 2 is a block diagram showing the structure of a projection apparatus 200 according to a second embodiment of the present invention. The projection apparatus 200 of the second embodiment is substantially the same as the projection apparatus 100 of the first embodiment, that is, the description of the projection apparatus 100 described above with respect to the first embodiment is basically applicable to the projection apparatus 200 of the second embodiment, The main difference between the two is mainly: in the second embodiment, the controller 220 is also electrically connected to the light source device. When the projection device 200 is in the second mode, the controller 220 also sends a light source control signal to the light source device 210, and the light source device 210 is based on The light source control signal reduces the power of the blue light and/or increases the power of the other color lights. Specifically, the light source device 210 may reduce the intensity of the blue light and/or increase the intensity of the other color light according to the light source control signal.

In the second embodiment, when the projection device 200 is in the second mode, the controller 220 also sends a light source control signal to the light source device 210, and the light source device 210 reduces the power of the blue light according to the light source control signal and/or increases the power of the other color lights. Therefore, the power reduction of the blue light in the source light for modulating the spatial light modulator 230 and/or the power increase of the other color light can further reduce the proportion of the blue image light generated by the spatial light modulator 230, thereby further reducing the proportion of the blue image light generated by the spatial light modulator 230. Reduce the harm of blue light to the human eye and achieve the purpose of eye protection.

Please refer to FIG. 3. FIG. 3 is a flowchart of a projection display method according to a preferred embodiment of the present invention. The projection display method may employ the projection apparatuses 100, 200 of any of the above embodiments. The projection display method includes the following steps S1-S4.

In step S1, source light is provided, and the source light includes blue light and other color lights. Step S1 may be performed by the light source devices 110, 210, that is, the light source light may be provided by the light source devices 110, 210, and the specific structure of the light source devices 110, 210 and the like have been described above, and will not be described herein.

Step S2: Receive original image data of an image to be displayed, where the original image data includes blue original grayscale values and other color original grayscale values. The step S2 may be performed by the controllers 120, 220 and/or the spatial light modulators 130, 230. The specific structures of the controllers 120, 220 and the spatial light modulators 130, 230 have been described above, and are not here. Let me repeat.

Step S3, modulating the light source light to generate image light according to the original image data in the first mode. Step S3 may be performed by the spatial light modulator 130, and the specific structure of the spatial light modulator 130 and the like have been described above, and will not be described herein.

Step S4, generating corrected image data according to the original image data in the second mode, and modulating the light source light to generate image light according to the corrected image data, the corrected image data including the blue original grayscale value corresponding to the blue a blue corrected grayscale value and/or other color corrected grayscale value corresponding to the other color original grayscale value, the blue corrected grayscale value being lower than the blue original grayscale value and/or The other color correction grayscale values are higher than the other color original grayscale values, wherein the blue light is modulated according to the blue corrected grayscale values in the second mode to generate blue image light and/or The other color correction gray scale values modulate the other color lights to produce other color image lights. Step S4 can be performed by the controllers 120, 220 and the spatial light modulators 130, 230. The specific structures of the controllers 120, 220 and the spatial light modulators 130, 230 have been described above and will not be described herein.

Compared with the prior art, in the projection display method of the present invention, the projection device has two modes, a second mode and a first mode, and in the second mode, the corrected image data is generated according to the original image data and the corrected image data is modulated. The light source light produces image light. Since the blue corrected grayscale value is lower than the blue original grayscale value and/or the other color corrected grayscale value is higher than other color original grayscale values in the corrected image data, 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.

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 technologies. The fields are all 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:

a spatial light modulator for modulating the source light to generate image light according to the original image data in a first mode, and for modulating the source light to generate image light according to the corrected image data in a second mode.

2. The projection apparatus according to claim 1, wherein the corrected image data comprises a blue corrected grayscale value corresponding to the blue original grayscale value and the other color original grayscale value, The spatial light modulator modulates the blue light according to the blue corrected grayscale value to generate blue image light in the second mode, and modulates the other color light according to the other color original grayscale value to generate other color image light .

The projection apparatus according to claim 1 or 2, wherein the other color light comprises red light and green light, and the other color original gray scale values include a red original gray scale value and a green original gray scale value. The spatial light modulator modulates the red light according to the red original grayscale value to generate red image light in the second mode, and the spatial light modulator is modulated according to the green original grayscale value in the second mode The green light produces green image light.

The projection apparatus according to claim 1, wherein the corrected image data comprises the blue corrected grayscale value corresponding to the blue original grayscale value and the corresponding original gray of the other color The other color of the order value corrects the grayscale value, the spatial light modulator modulates the blue light according to the blue corrected grayscale value to generate blue image light in the second mode, and corrects the grayscale according to the other color The value modulates the other color light to produce other color image light.

The projection apparatus according to claim 4, wherein the other color light comprises red light and green light, and the other color original gray scale values include a red original gray scale value and a green original gray scale value, The corrected grayscale values of the other colors include corresponding red corrected grayscale values and/or green corrected grayscale values, wherein the red corrected grayscale values are higher than the corresponding red original grayscale values and/or the green The corrected grayscale value is higher than the corresponding green original grayscale value, and the spatial light modulator is in the second mode according to the red original grayscale value and the green corrected grayscale value, the red corrected grayscale The value and the green original grayscale value, or the red corrected grayscale value and the green corrected grayscale value respectively modulate the red light and the green light to generate red image light and green image light.

6. The projection apparatus of claim 1, wherein the controller is configured to receive the raw image data in a first mode and provide the raw image data to the spatial light modulator, The controller is further configured to receive the raw image data in the second mode and convert the raw image data into the corrected image data and output the corrected image data to the spatial light modulator.

7. The projection apparatus of claim 1 wherein said controller is further operative to be turned off in a first mode, said spatial light modulator receiving said raw image data output by other circuitry and in accordance with said original The image data modulates the source light to generate image light, and the controller is further configured to receive the original image data output by the other circuit in the second mode, and convert the original image data into the corrected image data, and The corrected image data is output to the spatial light modulator.

8. The projection apparatus according to claim 1, wherein said controller further emits a light source control signal to said light source means in said second mode, said light source means reducing said said light source control signal The power of the blue light and/or the power of the other color light.

The projection apparatus according to claim 1, wherein in the second mode, the power of the blue light emitted by the light source device is less than 20% of the power of the light source. The ratio of the peak value of the other color light to the peak value of the blue light is 50% or more.

10. A projection display method for a projection device having a first mode and a second mode, the projection display method comprising the steps of: