CN110837199B

CN110837199B - Display device

Info

Publication number: CN110837199B
Application number: CN201810936633.1A
Authority: CN
Inventors: 余新; 郭祖强; 顾佳琦; 李屹
Original assignee: Appotronics Corp Ltd
Current assignee: Shenzhen Appotronics Corp Ltd
Priority date: 2018-08-16
Filing date: 2018-08-16
Publication date: 2021-10-12
Anticipated expiration: 2038-08-16
Also published as: WO2020034619A1; CN110837199A

Abstract

A display device includes a light source device, a first spatial light modulator, a second spatial light modulator, a first light recovery device and a second light recovery device, and the light source device is used to emit first color light, second color fluorescence, Two-color supplemental light, third-color fluorescent light, and third-color supplementary light; the first spatial light modulator is used to modulate the first color light to generate the first-color image light and modulate the second-color fluorescent light and the second-color supplementary light to generate the second color Image light and non-image light; the second spatial light modulator modulates the third color fluorescent light and the third color supplementary light to generate the third color image light and non-image light, and the first light recycling device converts the non-image light generated by the first spatial light modulator. The first color light and the second color supplementary light in the image light are recovered to the first spatial light modulator for reuse; the second light recovery device recovers the third color supplementary light in the non-image light generated by the second spatial light modulator to the second spatial light modulator for reuse.

Description

Display device

Technical Field

The invention relates to the technical field of display, in particular to a display device.

Background

The color gamut generally refers to the spectrum locus of visible light that can be seen by human eyes in nature, and the area of the region formed by the visible spectrum locus is the maximum color gamut area that can be seen by human eyes. At present, R, G, B three-primary-color display devices are adopted by display devices such as projectors and displays which are composed of different display devices to reproduce images in a color-restoring manner. In a specified chromaticity space, such as CIE1931 xy chromaticity space, the triangle formed by R, G, B three primary colors of a display device is called the color gamut which the device can display, and the larger the color gamut space area is, the more vivid and vivid the color picture is, however, how to make the display device realize the display of wider color gamut is an important technical subject in the industry.

Light sources of display devices such as laser projectors are generally classified into three major categories, one of which is to excite phosphors of different colors by short-wavelength laser to generate primary colors of red, green and blue. Another type directly utilizes red, green and blue lasers as the three primary color light sources. The third is the combination of the first two, and a general blue laser light source is used as an excitation light source with short wavelength to excite the fluorescent powder to generate red-green primary color light and also used as blue primary color light. Each of these three different implementation techniques has advantages and disadvantages. For the scheme of exciting the fluorescent powder or mixing the laser fluorescence by the laser, because the semiconductor blue laser with the gallium nitride substrate has the characteristics of high efficiency, long service life and stable work, the scheme of exciting the fluorescent powder color wheel by the blue semiconductor laser has the characteristics of long service life, high efficiency, stable equipment and low cost. But the color gamut of this solution is relatively small due to the broad spectrum of phosphor-excited fluorescence (Laser phosphor). Generally, a display device using the technology can cover the complete sRGB color gamut, and the color gamut can be enhanced to reach the DCI-P3 color gamut by some enhancement processing, such as adding a narrow-band optical filter to remove the yellow light spectrum in the green light and the red light. But the narrow-band filtering loses considerable luminance of the light, so that the efficiency of the display device is greatly reduced. A display device using pure RGB lasers has a very wide color gamut because RGB lasers have very good monochromaticity. A display device (e.g., a projection system) using RGB laser can easily meet the rec.2020 color gamut standard, and please refer to fig. 1 for a comparison of the color gamuts of the display devices.

However, RGB laser display devices (such as projectors) also have a number of disadvantages. The first is speckle. Speckle is caused by the coherence of laser light, and the light reflected on a display plane interferes due to a phase difference caused by the fluctuation of the plane, resulting in uneven brightness distribution on the display screen. Although there have been many inventions that attempt to solve the problem of laser speckle, none are ideal. Secondly, the cost of the RGB laser display device is high. This is because the red and green lasers in RGB laser display devices are not mature under the current technology. The efficiency of semiconductor green laser can only be below 20%, which is far lower than blue laser of gallium nitride substrate and red laser of ternary substrate, and the cost is very high. While the red laser has almost the same efficiency as the blue laser, the red laser has poor temperature stability, and not only the efficiency is significantly reduced with the increase of temperature, but also the center wavelength is shifted. The two points make the RGB laser display device have color cast along with temperature change. This requires a thermostat for the red laser to stabilize the operating state of the red laser, which means a powerful cooling device is required to ensure the operating temperature of the red laser to be stable, thereby greatly increasing the cost of the RGB laser display device.

In view of the above, the present invention proposes to combine the laser fluorescence and the complementary light such as RGB laser, so as to effectively exert the advantages of both and make up for the respective disadvantages. A small amount of red and green laser is added into the laser fluorescence system to serve as supplement light, so that the color gamut range of the projection system can be effectively expanded. And due to the addition of fluorescence, the speckle effect of supplementary light such as pure laser can be greatly weakened. Although speckle cannot be completely eliminated, the addition of fluorescence greatly reduces the contrast of speckle from being perceived by the human eye. Because the red and green excitation supplement light with high power is not needed, compared with an RGB laser light source, the red and green excitation supplement light does not need a complex heat dissipation system, and the cost of the system is greatly reduced.

Further, it is also an important issue how to recycle the non-image light generated by the display device to improve the light utilization rate and the brightness of the image. Existing display devices, such as projection devices, typically employ spatial light modulators for image modulation, which may generate non-image light during the image modulation process, which the present invention contemplates recycling. In particular, a DMD (Digital Micromirror Device) spatial Light modulator using DLP (Digital Light processing) projection technology is increasingly widely used due to its advantages of high contrast, long Device lifetime, high fill factor, etc. In the DLP projection technology, three colors of light (R (red), G (green), and B (blue) (or more colors such as R (red), G (green), B (blue), and W (white)) emitted from a light source in time series are projected onto a DMD chip, and the DMD chip receives a control signal from a DLP control system and then reflects the light of different colors onto a projection screen to form an image.

The DMD chip is composed of hundreds of thousands or even millions of micromirrors, and one micromirror corresponds to one pixel. The rotating device is arranged below each micromirror, the micromirrors can be turned between an ON state and an OFF state under the control of a digital driving signal output by a DLP control system, and the turning speed of the micromirrors can reach thousands of times per second.

As shown in fig. 2, fig. 2 is a schematic diagram of an optical path of a DMD chip using DLP projection technology to modulate an image, where the DMD chip includes a plurality of micromirrors 8, and when the micromirrors 8 are in an ON state, incident light 9 is reflected to a projection lens 10 and finally emitted to form an image; when the micromirrors 8 are in the OFF state, the incident light 9 is reflected to an area outside the projection lens 10, absorbed by the projector housing or reflected back and forth inside the housing to be lost. The DLP control system controls the number of times (total duration) that the corresponding micromirror 8 is in the ON state according to the gray-scale value of each pixel in the image frame data, and the number of times (total duration) that each micromirror 8 is in the ON state determines the brightness of the corresponding pixel ON the projection screen.

In the image modulation process, the micromirrors 8 of the DMD chip in the ON state reflect incident light to the projection lens 10 to form projection light, and the DMD chip also reflects light of a considerable intensity by the micromirrors 8 in the OFF state to lose the light, so that light other than the projection light is not effectively utilized.

In view of the above, a basic light recycling system design of a one-chip spatial light modulator is shown in fig. 3. Specifically, the display apparatus shown in fig. 3 includes a light source 15, a polarization conversion device 13, a polarization light combining plate 16, a spatial light modulator 11, and a lens assembly 12, wherein light emitted from the light source 15 is subjected to polarization conversion by the polarization conversion device 13 and then incident ON the spatial light modulator 11, light is reflected and provided to the lens assembly 12 in an ON state, and light is subjected to polarization conversion by the polarization conversion device 14 and reflected by the polarization light combining plate 16 and then incident ON the spatial light modulator 11 again to enhance the screen brightness in an OFF state. Another light recycling system design based on a dual-optical spatial modulator is shown in fig. 4, specifically, the display device shown in fig. 3 includes a light source 1, a first spatial light modulator 2,

relay elements

5, 6, 7, 8, a second spatial light modulator 3, and a lens assembly 4, where light emitted by the light source 1 is modulated by the first spatial light modulator 2 to form first light 18 for displaying an image and second light 17 not used for displaying an image. The first light 17 passes through the light recycling system 19 and then is modulated with the second light 18 by the second spatial light modulator 3, but the first spatial light modulator 2 is limited to LCD or LCOS. It is understood that the light recycling system of the display device shown in fig. 2 may include light guiding and relaying

elements

5, 6, 7, and 8, and the lens assembly 4 is disposed corresponding to the second spatial light modulator 3, and may perform projection display on the image light emitted by the second spatial light modulator 3.

However, the above two designs also have respective disadvantages, such as the first one is not directed to the display device of the existing two-piece type spatial light modulator, and the second one has a limitation on the type of the spatial light modulator, which needs to be improved.

Disclosure of Invention

In view of the above, the present invention provides a display device that can improve at least one of the above technical problems.

A display apparatus includes a light source device, a first spatial light modulator, a second spatial light modulator, a first light recovery device, and a second light recovery device, the light source device being configured to emit a first color light, a second color fluorescence, a second color complementary light, a third color fluorescence, and a third color complementary light; the first spatial light modulator is used for receiving first color light, second color fluorescent light and second color supplement light emitted by the light source device, modulating the first color light to generate first color image light and modulating the second color fluorescent light and the second color supplement light to generate second color image light and non-image light; the second spatial light modulator is used for receiving third color supplementary light and third color fluorescent light emitted by the light source device, modulating the third color fluorescent light and the third color supplementary light to generate third color image light and non-image light, and synthesizing the first color image light emitted by the first spatial light modulator, the second color image light and the third color image light emitted by the second spatial light modulator to display an image; the first light recovery device is used for recovering the first color light and the second color supplement light in the non-image light generated by the first spatial light modulator to the first spatial light modulator for reuse; the second light recovery device is used for recovering the third color supplement light in the non-image light generated by the second spatial light modulator to the second spatial light modulator for reuse;

the light source device comprises a wavelength conversion system, a light splitting device, a first supplementary light source, a first light combining element and a first polarization conversion device, wherein the wavelength conversion system comprises an excitation light source and a wavelength conversion element, the excitation light source is used for emitting excitation light, the wavelength conversion element is used for converting a part of the excitation light into second color fluorescence and third color fluorescence, the wavelength conversion system is used for providing the second color fluorescence and the third color fluorescence converted by the wavelength conversion element to the first light combining element and providing the other part of the excitation light serving as the first color light to the first light combining element, the first supplementary light source is used for emitting the second color supplementary light to the first light combining element, and the first light combining element is used for combining the first color light, the second color fluorescence, the third color fluorescence and the second color supplementary light and providing the combined light to the light splitting device, the light splitting device is used for guiding the first color light, the second color fluorescence and the second color supplement light to the first spatial light modulator and guiding the third color fluorescence to the second spatial light modulator; the first polarization conversion device is located between the first light combining element and the first spatial light modulator, and is configured to convert the first color light, the second color fluorescence and the second color supplementary light emitted by the light splitting device into the first color light, the second color fluorescence and the second color supplementary light in a first polarization state.

Compared with the prior art, in the display device, the color gamut of the second color fluorescence can be widened by the second and third color supplementary lights, so that the color gamut of the display device is wider and the display effect is better. In addition, the second and third color supplementary lights can also increase the brightness of the display device, thereby achieving high-brightness image display. In addition, the first light recovery device and the second light recovery device are used for recovering the second color supplement light and the third color supplement light in the non-image light to the first spatial light modulator and the second spatial light modulator for reuse, so that the cost is saved, the brightness of the second color supplement light and the brightness of the third color supplement light of the picture are enhanced, and the brightness of the second color supplement light and the brightness of the third color supplement light of each pixel of the picture are improved.

Drawings

Fig. 1 is a comparison diagram of the gamut ranges of several display devices using different light sources.

Fig. 2 is a schematic diagram of the optical path principle of a DMD chip modulated image using DLP projection technology.

Fig. 3 is a schematic diagram of the structure and optical path principle of a basic light recycling system of a one-chip spatial light modulator.

Fig. 4 is a schematic diagram of the structure and light path principle of another light recycling system based on a dual-optical spatial modulator.

FIG. 5 is a block diagram of a display device according to a preferred embodiment of the present invention.

Fig. 6 is a schematic diagram of the image modulation principle of the display device of fig. 5.

Fig. 7 is a schematic view of a structure of a wavelength conversion system of the display device shown in fig. 5.

Fig. 8 is a schematic diagram of the gamut range of the display device shown in fig. 5.

Fig. 9-11 are timing diagrams of systems employed by the display device 100.

Fig. 10 is a schematic diagram of the technical gamut and color volume expansion of the display device shown in fig. 5.

Description of the main elements

Display device 100

Light source device 110

First spatial light modulator 120

Second spatial light modulator 130

Light splitting device 140

Image synthesizing apparatus 150

Wavelength conversion system 111

First supplemental light source 112

First light combining element 113

First polarization conversion device 114

Second supplemental light source 115

Second light combining element 116

Second polarization conversion device 117

Excitation light source 111a

Wavelength conversion element 111b

Segment region 111c

Relay lenses

101, 102

First light recovery device 160

Second light recovery device 170

First switching absorber 161

First polarization conversion element 162

First polarization light combination element 163

First guide element 164

First relay elements

165, 166

Second polarization light combination element 173

Second polarization conversion element 172

Second switching absorber 171

Second guide member 174

Second relay elements

175, 176

Light combining device 151

Lens assembly 152

Color gamut ranges F1, F2, F3

The following detailed description will further illustrate the invention in conjunction with the above-described figures.

Detailed Description

In view of the above, the present invention provides a display device for improving at least one of the above-mentioned technical problems, and specifically, the display device includes a light source device, a first spatial light modulator, a second spatial light modulator, a first light recycling device and a second light recycling device, wherein the light source device is configured to emit a first color light, a second color fluorescent light, a second color complementary light, a third color fluorescent light and a third color complementary light; the first spatial light modulator is used for receiving first color light, second color fluorescent light and second color supplement light emitted by the light source device, modulating the first color light to generate first color image light and modulating the second color fluorescent light and the second color supplement light to generate second color image light and non-image light; the second spatial light modulator is used for receiving third color supplementary light and third color fluorescent light emitted by the light source device, modulating the third color fluorescent light and the third color supplementary light to generate third color image light and non-image light, and synthesizing the first color image light emitted by the first spatial light modulator, the second color image light and the third color image light emitted by the second spatial light modulator to display an image; the first light recovery device is used for recovering the first color light and the second color supplement light in the non-image light generated by the first spatial light modulator to the first spatial light modulator for reuse; the second light recycling device is used for recycling the third color supplement light in the non-image light generated by the second spatial light modulator to the second spatial light modulator for reuse.

Referring to fig. 5 and fig. 6, fig. 5 is a block diagram of a display device 100 according to a preferred embodiment of the invention, and fig. 6 is a schematic diagram of an image modulation principle of the display device 100 shown in fig. 5. The display apparatus 100 includes a light source device 110, a first spatial light modulator 120, a second spatial light modulator 130, an image synthesizing device 150, a first light recycling device 160, and a second light recycling device 170. The first spatial light modulator 120 and the second spatial light modulator 130 constitute a light modulation module for performing image modulation on light emitted from the light source device 110 according to image data to generate non-image light and image light required by an image to be displayed. The first light recycling device 160 and the second light recycling device 170 constitute the light recycling module, and are used for recycling a part of the non-image light to the light modulation module for reuse.

Specifically, the light source device 110 is configured to emit a first color light, a second color fluorescent light, a second color supplementary light, a third color fluorescent light, and a third color supplementary light.

The first spatial light modulator 120 is configured to receive the first color light, the second color fluorescent light, and the second color supplementary light emitted by the light source device 110, modulate the first color light to generate a first color image light, modulate the second color fluorescent light and the second color supplementary light to generate a second color image light, and guide the first color image light and the second color image light to the image synthesizing device 150.

The first spatial light modulator 120 also generates a first color non-image light and a second color non-image light when modulating the first color light, the second color fluorescent light and the second color complementary light, and the first light recycling device 160 is configured to recycle the first color light in the first color non-image light and the second color complementary light in the second color non-image light to the first spatial light modulator 120 for reuse.

The second spatial light modulator 130 is configured to receive the third color supplementary light and the third color fluorescent light emitted by the light source device 110, and modulate the third color fluorescent light and the third color supplementary light to generate third color image light. The image synthesizing device 150 is used for synthesizing the first color image light with the second color image light and the third color image light emitted by the second spatial light modulator 130 to display an image. The second spatial light modulator 130 is further configured to generate third color non-image light when modulating the third color fluorescent light and the third color complementary light, and the second light recycling device 170 is further configured to receive at least a portion of the third color non-image light generated by the second spatial light modulator 130 and recycle at least a portion of the third color non-image light to the second spatial light modulator 130 for reuse.

In this embodiment, the light source device 110 includes a wavelength conversion system 111, a light splitting device 140, a first supplemental light source 112, a first light combining element 113, a first polarization conversion device 114, a second supplemental light source 115, a second light combining element 116, and a second polarization conversion device 117. Referring to fig. 7, fig. 7 is a schematic structural diagram of the wavelength conversion system 111, and the wavelength conversion system 111 includes an excitation light source 111a and a wavelength conversion element 111 b.

The excitation light source 111a is configured to emit excitation light, the wavelength conversion element 111b is configured to convert a portion of the excitation light into second color fluorescence and third color fluorescence, and the wavelength conversion system 111 provides the second color fluorescence and the third color fluorescence converted by the wavelength conversion element 111b to the first light combining element 113, and also provides another portion of the excitation light as the first color light to the first light combining element 113.

The excitation light source 111a may be a laser light source, such as a blue laser light source, for emitting blue laser light as the excitation light. The wavelength conversion element 111b may be a color wheel, transmissive or reflective, but not limited thereto, and may include at least two segment regions 111c sequentially arranged in a circumferential direction. When the wavelength converting element is operated, each of the segmented regions 111c is sequentially located on the optical path of the excitation light. One of the segment regions 111c may receive the excitation light and emit the excitation light as the first color light. At least one segment region 111c is provided with a phosphor for receiving the excitation light and generating an excited light as the second color fluorescence and the third color fluorescence, and in one embodiment, the phosphor may be a yellow phosphor for emitting yellow fluorescence, the yellow fluorescence includes a green fluorescence component and a red fluorescence component, and the green fluorescence component and the red fluorescence component respectively serve as the second color fluorescence and the third color fluorescence. That is, the first color light is blue laser, and the second color fluorescence and the third color fluorescence are green fluorescence and red fluorescence, respectively.

The first supplemental light source 112 is configured to emit the second color supplemental light to the first light combining element 113. The first supplemental light source 112 may be a laser light source for emitting a second color laser as the second color supplemental light, as described above, the second color is green, and thus the first supplemental light source 112 is a green laser light source for emitting a green laser as the second color supplemental light.

The first light combining element 113 is configured to combine the second color fluorescence, the third color fluorescence and the second color complementary light and provide the combined light to the light splitting device 140. The first light combining element 113 may be a wavelength light combining film, and transmits the second color supplementary light emitted from the first supplementary light source 112 and reflects the light (the first color light, the second color fluorescent light, and the third color fluorescent light) emitted from the wavelength conversion system 111, so as to combine the second color supplementary light, the first color light, the second color fluorescent light, and the third color fluorescent light. It should be understood that, in an alternative embodiment, the first light combining element 113 may reflect the second color supplementary light and transmit the light emitted from the wavelength conversion system 111 to combine the light, or the first light combining element 113 may employ a light combining film or a polarization light combining film with a coated region to transmit or reflect the second color supplementary light and reflect or transmit the light emitted from the wavelength conversion system 111 to combine the light, which is not listed here.

The light splitting device 140 is used for guiding the first color light, the second color fluorescent light and the second color supplement light to the first spatial light modulator 120 and guiding the third color fluorescent light to the second spatial light modulator 130.

The first polarization conversion device 114 is located between the first light combining element 113 and the first spatial light modulator 120, and is configured to convert the second color fluorescence and the second color complementary light emitted by the light splitting device 140 into the second color fluorescence and the second color complementary light in the first polarization state. It is understood that the light of the first polarization state may be one of S light or P light. In addition, a relay lens 101 may be disposed between the first light combining element 113 and the first polarization conversion device 114 for collimating and guiding light.

The second supplemental light source 115 is configured to emit the supplemental light of the third color to the second light combining element 116. The second supplemental light source 115 may be a laser light source for emitting a third color laser as the third color supplemental light, as described above, the third color is red, and therefore, the second supplemental light source 115 is a red laser light source for emitting a red laser as the third color supplemental light.

The second light combining element 116 is located on a light path between the light splitting device 140 and the second spatial light modulator 130, the light splitting device 140 is configured to emit the third color fluorescence to the second light combining element 116, the second supplemental light source 115 is configured to emit the third color supplemental light to the second light combining element 116, and the second light combining element 116 is configured to combine the third color fluorescence and the third color supplemental light and provide the combined light to the second spatial light modulator 130. Like the first light combining element 113, the second light combining element 116 may be a wavelength light combining film, a light combining film with a region coating, or a polarization light combining film, which is not listed here. It is understood that a relay lens 102 may be disposed between the second light combining element 116 and the second spatial light modulator 130 for collimating, guiding, etc. light.

The second polarization conversion device 117 is located between the second light combining element 116 and the second spatial light modulator 130, and is configured to convert the third color supplementary light emitted by the second light combining element 116 into the third color supplementary light in the first polarization state or the second polarization state.

Further, the first spatial light modulator 120 is a DMD spatial light modulator, the first spatial light modulator 120 reflects the first color light as the first color image light when the micromirrors thereof are in an ON (ON) state, and the reflected second color fluorescence and the second color complementary light are provided to the image synthesizing device 150 as the second color image light. The first spatial light modulator 120 reflects the first color light as first color non-image light and the second color fluorescent light and the second color supplement light as the second color non-image light when its micromirrors are in an OFF (OFF) state.

The first light recycling device 160 includes a first switching absorber 161, a first polarization conversion element 162, and a first polarization combining element 163. The first switch absorber 161 is used to absorb or block the second color fluorescence in the second color non-image light, and the first color light in the first color non-image light and the second color complementary light in the second color non-image light are recycled to the first spatial light modulator 120 by the first light recycling device 160 for recycling. The first switched absorber 161 may be a narrow band filter for absorbing or blocking the second color fluorescence in the second color non-image light, and the second color complementary light in the second color non-image light may pass through the first switched absorber 161.

According to the foregoing, the first color light, the second color fluorescent light and the second color supplementary light all have the first polarization state through the first polarization conversion device 114. In the first light recycling device 160, the first color light, the second color fluorescent light, and the second color supplement light are all guided to the first spatial light modulator 120 through the first polarization combining element 163, the first color non-image light and the second color non-image light also have the first polarization state, the first polarization conversion element 162 converts the polarization state of the first color light of the first color non-image light and the second color supplement light of the second color non-image light into the second polarization state, the first color light of the first color non-image light of the second polarization state and the second color complementary light of the second color non-image light are guided to the first polarization combining element 163, the first polarization combining element 163 further guides the first color light of the first color non-image light in the second polarization state and the second color supplementary light of the second color non-image light to the first spatial light modulator 120 for modulation again. It is to be understood that the first light recycling device 160 may further include a first guiding element 164 and

first relay elements

165 and 166, and the first guiding element 164 and the first relay element 166 are located on an optical path between the first spatial light modulator 120 and the first polarization conversion element 162 or an optical path between the first polarization conversion element 162 and the first polarization combining element 163, and are used for guiding the first color non-image light and the second color non-image light. In this embodiment, the first relay elements 165 and 166 (such as relay lenses) are mainly positioned between the first guide element 164 and the first spatial light modulator 120, and between the first guide element 165 and the first polarization conversion element 162. Further, it is understood that the first light recycling device 160 may further include a light homogenizing device, which may be located between the first guiding element 164 and the

first relay elements

165 and 166, and is used for homogenizing the recycled second color supplement light to form a uniform illumination spot, so that the second color supplement light can be conveniently recycled and utilized in a subsequent light path.

Specifically, the second spatial light modulator 130 is a DMD spatial light modulator, and the third color fluorescent light and the third color complementary light reflected by the second spatial light modulator 130 when the micro mirror thereof is in the on (on) state are both provided to the image synthesizing device 150 as the third color image light. The second spatial light modulator 130 reflects the third color fluorescent light and the third color supplement light as the third color non-image light when its micromirror is in an off state.

The second light recovery device 170 includes a second polarization combining element 173, a second polarization conversion element 172, and a second switching absorber 171. The second switch absorber 171 is used to absorb or block the fluorescence of the third color in the third color non-image light, and the supplementary light of the third color in the third color non-image light is recycled to the second spatial light modulator 130 by the second light recycling device 170 for reuse. The second switching absorber 171 may be a narrow band filter for absorbing or blocking the third color fluorescence in the third color non-image light, and the third color complementary light in the third color non-image light may pass through the second switching absorber 171.

Specifically, the third color fluorescent light and the third color complementary light may both have one polarization state (e.g., one of the first polarization state and the second polarization state), the third color fluorescent light and the third color complementary light are both guided to the second spatial light modulator 130 through the second polarization combiner 173, the third color supplement light in the third color non-image light also has the one polarization state, the second polarization conversion element 172 converts the polarization state of the third color supplement light in the third color non-image light into another polarization state, the third color complementary light in the third color non-image light of the other polarization state is guided to the second polarization combining element 173, the second polarization combining element 173 also guides the third color supplementary light in the third color non-image light with the other polarization state to the second spatial light modulator 130 for modulation again. It is understood that the second light recycling device 170 further includes a second guiding element 174 and/or second relay elements 175, 176 (such as relay lenses), and the second guiding element 174 and/or the

second relay elements

175, 176 are located on the optical path between the second spatial light modulator 130 and the second polarization conversion element 172 or the optical path between the second polarization conversion element 172 and the second polarization combining element 173, and are used for guiding the third color non-image light. Further, it is understood that the second light recycling device 170 may further include a light homogenizing device, which may be located between the second guiding element 174 and the

second relay elements

175 and 176, and is used for homogenizing the recycled third color supplement light to form a uniform illumination spot, so that the third color supplement light can be conveniently recycled and utilized in a subsequent light path.

The image combining device 150 includes a light combining device 151 and a lens assembly 152, the light combining device 151 is configured to combine the first color image light and the second color image light emitted by the first spatial light modulator 120 with the third color image light emitted by the second spatial light modulator 130, and the lens assembly 152 is configured to project the first color image light, the second color image light and the third color image light emitted by the light combining device 151 to display an image.

In the present embodiment, the first color is blue, the second color is green, and the third color is red, but in a modified embodiment, the second color may be red, and the third color may be green.

It is understood that, as mentioned above, the first color light, the second color fluorescence and the third color fluorescence are respectively blue laser light, green fluorescence and red fluorescence, and the gamut range that the three can jointly exhibit is the first gamut range F1, i.e. the gamut range that the light emitted by the wavelength conversion system 111 can exhibit is the first gamut range F1, as shown in fig. 8, and the first gamut range F1 may be a gamut DCI range, such as gamut range DCI-P3. The first color light, the second color supplement light and the third color supplement light are respectively blue laser, green laser and red laser, so that a color gamut which can be commonly displayed by the first color light, the second color supplement light and the third color supplement light is a second color gamut range F2, wherein the second color gamut F2 covers the first color gamut F1 and has a portion exceeding the first color gamut F1, and the second color gamut F2 can be a color gamut rec.2020.

The first and second spatial

light modulators

120 and 130 modulate the first color light, the second color fluorescence, the second color complementary light, the third color fluorescence and the third color complementary light according to image signals to obtain the first color light, the second color fluorescence, the second color complementary light, the third color fluorescence and the third color complementary light with different proportions, so as to display an image in any one color gamut range (such as the color gamut range F3) from the first color gamut range F1 to the second color gamut range F2.

Specifically, when the color gamut of the image data of one image to be displayed is within the first color gamut F1, the light source device 110 may be controlled to emit the first color light, the second color fluorescence and the third color fluorescence, and the first and second spatial

light modulators

120 and 130 modulate the first color light, the second color fluorescence and the third color fluorescence according to the corrected image data to obtain the image of the first color gamut F1, so that the image is accurately displayed. At this time, the corrected image data may be the same as the original image data.

When the color gamut of the original image data of an image to be displayed falls on (or is outside) the boundary line of the second color gamut F2, the light source device may be controlled to emit the first color light, the second color supplement light, and the third color supplement light, and the first and second spatial

light modulators

120 and 130 modulate the first color light, the second color supplement light, and the third color supplement light according to the corrected image data to obtain the image of the second color gamut F2, so that the image is accurately displayed.

When the color gamut of the original image data of one image to be displayed falls between the first color gamut F1 and the second color gamut F2 (excluding the boundary line between the two color gamut), the light source device 110 is controlled to emit the first color light, the second color fluorescent light, the second color complementary light, the third color fluorescent light and the third color complementary light, and the first and second spatial

light modulators

120 and 130 modulate the first color light, the second color fluorescent light, the second color complementary light, the third color fluorescent light and the third color complementary light according to a correction image data to obtain an image of the color gamut between the first color gamut F1 and the second color gamut F2, so that the image is accurately displayed.

In summary, when the gamut of the original image data of an image to be displayed falls outside the first gamut F1 (as in the second gamut F2)On and outside the boundary line between the first color gamut F1 and the second color gamut F2), the corrected image data may include a first corrected image signal b corresponding to the first color light, a second corrected image signal g corresponding to the second color fluorescence, a third corrected image signal gl corresponding to the second color supplemental light, a fourth corrected image signal r corresponding to the third color fluorescence, and a fifth corrected image signal rl corresponding to the third color supplemental light. The first, second, third, fourth and fifth corrected image signals are based on the first color original signal B₀Second color original signal G₀And a third color original signal R₀Is obtained by calculation according to the original signal R₀、G₀、B₀The calculated tristimulus values of the pixels are equal to the tristimulus values of the pixels calculated from the first, second, third, fourth and fifth corrected image signals r, g, b, rl, gl of the pixels. Wherein the original signal R is determined according to each pixel₀、G₀、B₀When calculating the corrected image signals r, g, b, rl, gl, rl is taken²+gl²Minimum r, g, b, rl, gl data values.

The system timing employed by the display device 100 is first described below.

Referring to fig. 9, fig. 9 is a timing diagram of a first system adopted by the display apparatus 100. In a first time period T1 of a modulation period T of one frame image, the excitation light source 111a emits a first color light (i.e. blue laser light), the wavelength conversion element 111b emits a third color fluorescence (i.e. red fluorescence light), so that the wavelength conversion system 111 emits the third color fluorescence light to the first light combining element 113, the first complementary light source 112 emits a second color complementary light (i.e. the green laser light) to the first light combining element 113, the first light combining element 113 is configured to combine the first color light, the second color fluorescence light, the third color fluorescence light and the second color complementary light and provide the combined light to the light splitting device 140, the light splitting device 140 is configured to provide the first color light, the second color fluorescence light, and the second color complementary light to the relay lens 101 and guide the third color fluorescence light to the second light combining element 116, the relay lens 101 transmits the second color supplementary light to the first polarization conversion device 114, the first polarization conversion device 114 converts the second color supplementary light into second color supplementary light having a first polarization state, the first polarization combining element 163 receives the second color supplementary light having the first polarization state emitted from the first polarization conversion device 114 and transmits the second color supplementary light having the first polarization state to the first spatial light modulator 120, the first spatial light modulator 120 modulates the second color supplementary light according to an image signal (e.g., a correction image signal gl) to generate second color image light and second color non-image light, and the second color image light is guided (e.g., transmitted) to the image synthesis device 150 for generating a second color image; the second complementary light source 115 emits a third color complementary light (i.e., a red laser) to the second light combining element 116, the second light combining element 116 combines the third color fluorescent light and the third color complementary light, the combined third color fluorescent light and the third color complementary light are transmitted to the second polarization conversion device 117 through the relay lens 102, the second polarization conversion device 117 converts the third color fluorescent light and the third color complementary light into light with one polarization state (both the first polarization state and the second polarization state, which is mainly described in this embodiment as light with the first polarization state), the second light combining element 116 receives the third color fluorescent light and the third color complementary light with the polarization states and guides (e.g., transmits) the third color fluorescent light and the third color complementary light with the polarization states to the second spatial light modulator 130, the second spatial light modulator 130 modulates the third color fluorescent light and the third color complementary light with polarization states according to image signals (such as corrected image signals rl and r) to generate third color image light and third color non-image light, the third color image light is reflected to the image synthesizing device 150, the light combining device 151 of the image synthesizing device 150 receives the second color image light and the third color image light to combine the second color image light and the third color image light and provide the combined light to the lens assembly 152, and the lens assembly projects the second color image light and the third color image light to generate a second color image and a third color image.

Further, as shown in fig. 9, in the first period T1, the second color non-image light generated by the first spatial light modulator 120 is provided to the first switch absorber 161, the first switch absorber 161 emits a second color supplement light of the second color non-image light, the second color supplement light has a first polarization state, the second color supplement light emitted by the first switch absorber 161 is transmitted to the first polarization conversion element 162 through the first relay element 165, the first guiding element, the first relay element 166, the first polarization conversion element 162 converts the second color supplement light into a second color supplement light of a second polarization state, the second color supplement light of the second polarization state is transmitted to the first polarization combination element 163 by the first polarization conversion element 162, and the second color supplement light recovered by the first light recovery device 160 by the first polarization combination element 163 is reflected to the first switch absorber 161 The first spatial light modulator 120, the first spatial light modulator 120 can further modulate the second color supplement light according to the image signal (such as the corrected image signal gl) to generate a second color image light, the second color image light is guided to the image synthesis device 150 for further generating a second color image; the third color non-image light generated by the second spatial light modulator 130 is provided to the second switch-type absorber 171, the second switch-type absorber 171 emits a third color supplement light of the third color non-image light, the third color supplement light has a polarization state (such as a first polarization state), the third color supplement light emitted by the second switch-type absorber 171 is transmitted to the second polarization conversion element 172 through the second relay element 175, the second guiding element 174 and the second relay element 176, the second polarization conversion element 172 converts the third color supplement light into a third color supplement light of another polarization state (such as a second polarization state), the third color supplement light of the another polarization state is transmitted to the second polarization combination element 173 by the second polarization conversion element 172, and the third color supplement light recovered by the second light recovery device 170 of the second polarization combination element 173 is reflected to the second space absorber 171 The inter-light modulator 130, the second spatial light modulator 120 may further modulate the third color supplement light according to image signals (such as the corrected image signals rl and r) to generate a third color image light and provide the third color image light to the image synthesis device 150 for further generating a third color image.

As shown in fig. 9, during a second time period T2 of the modulation period T of one frame image, the excitation light source 111a emits a first color light (i.e., blue laser light), the wavelength conversion element 111b emits a second color fluorescence (i.e., green fluorescence), so that the wavelength conversion system 111 emits the second color fluorescence to the first light combining element 113, the first supplemental light source 112 emits a second color supplemental light (i.e., the green laser light) to the first light combining element 113, the first light combining element 113 reflects the second color fluorescence to the relay lens 101 and transmits the second color supplemental light to the light splitting device 140, the light splitting device 140 guides (e.g., transmits) the second color fluorescence and the second color supplemental light to the relay lens 101, the relay lens 101 transmits the second color fluorescence and the second color supplemental light to the first polarization conversion device 114, the first polarization conversion device 114 converts the second color fluorescence and the second color complementary light into a second color fluorescence and a second color complementary light with a first polarization state, the first polarization combining element 163 receives the second color fluorescence and the second color complementary light with the first polarization state emitted by the first polarization conversion device 114 and transmits the second color fluorescence and the second color complementary light with the first polarization state to the first spatial light modulator 120, the first spatial light modulator 120 modulates the second color fluorescence and the second color complementary light according to an image signal (such as an image signal g and a correction image signal gl) to generate a second color image light and a second color non-image light, the first spatial light modulator 120 further provides the second color image light to the image synthesis device 150, the image synthesis device 150 is configured to generate a second color image, the second supplementary light source 115 emits a third color supplementary light (i.e. red laser light) to the second light combining element 116, the second light combining element 116 transmits the third color supplementary light to the second polarization conversion device 117 via the relay lens 102, the second polarization conversion device 117 converts the third color supplementary light into light with one polarization state (either the first polarization state or the second polarization state, in this embodiment, the light is mainly converted into the light with the first polarization state), the second light combining element 116 receives the third color supplementary light with the polarization state and guides (e.g. transmits) the third color supplementary light with the polarization state to the second spatial light modulator 130, the second spatial light modulator 130 modulates the third color supplementary light with the polarization state according to an image signal (e.g. a correction image signal rl) to generate a third color image light and a third color non-image light, the third color image light is reflected to the image synthesis device 150, the light combination device 151 of the image synthesis device 150 receives the second color image light and the third color image light, combines the second color image light and the third color image light, and provides the combined light to the lens assembly 152, and the lens assembly projects the second color image light and the third color image light to generate a second color image and a third color image.

Further, as shown in fig. 9, in the second period T2, the second color non-image light generated by the first spatial light modulator 120 is provided to the first switch absorber 161, the first switch absorber 161 absorbs the second color fluorescence and emits second color supplement light of the second color non-image light, the second color supplement light has a first polarization state, the second color supplement light emitted by the first switch absorber 161 is provided to the first polarization conversion element 162 via the first relay element 165, the first guide element, the first relay element 166, the first polarization conversion element 162 converts the second color supplement light into second color supplement light of a second polarization state, the second color supplement light of the second polarization state is transmitted to the first polarization combination element 163 by the first polarization conversion element 162, the first polarization combining element 163 and the second color supplement light recycled by the first light recycling device 160 are reflected to the first spatial light modulator 120, and the first spatial light modulator 120 can further modulate the second color supplement light according to the image signal (such as a corrected image signal gl) to generate a second color image light, which is sent to the image synthesizing device 150 for further generating a second color image; the third color non-image light generated by the second spatial light modulator 130 is provided to the second switch-type absorber 171, the second switch-type absorber 171 emits a third color supplement light of the third color non-image light, the third color supplement light has a polarization state (such as a first polarization state), the third color supplement light emitted by the second switch-type absorber 171 is transmitted to the second polarization conversion element 172 through the second relay element 175, the second guiding element 174 and the second relay element 176, the second polarization conversion element 172 converts the third color supplement light into a third color supplement light of another polarization state, the third color supplement light of the another polarization state (such as a second polarization state) is transmitted to the second polarization combination element 173 by the second polarization conversion element 172, and the third color supplement light recovered by the second light recovery device 170 of the second polarization combination element 173 is reflected to the second space absorber 171 The inter-light modulator 130, the second spatial light modulator 120 may further modulate the third color supplement light according to image signals (such as the corrected image signals rl and r) to generate a third color image light and provide the third color image light to the image synthesis device 150 for further generating a third color image.

As shown in fig. 9, in a third time period T3 of a modulation period T of one frame of image, the excitation light source 111a emits a first color light (i.e. blue laser light), the wavelength conversion element 111b emits a first color light to the first light combining element 113, the first supplemental light source 112 is turned off, the first light combining element 113 reflects the first color light to the relay lens 101, the relay lens 101 transmits the first color light to the first polarization conversion device 114, the first polarization conversion device 114 converts the first color light into a first color light having a first polarization state, the first polarization light combining element 163 receives the first color light having the first polarization state emitted by the first polarization conversion device 114 and transmits the first color light having the first polarization state to the first spatial light modulator 120, and the first spatial light modulator 120 modulates the first color light according to an image signal (e.g. image signal b) The first spatial light modulator 120 further provides the first color image light to the image synthesis device 150 for generating a first color image, the second supplemental light source 115 emits a third color supplemental light (i.e., red laser light) to the second light combining element 116, the second light combining element 116 reflects the third color supplemental light to the relay lens 102, the relay lens 102 transmits the third color supplemental light to the second polarization conversion device 117, the second polarization conversion device 117 converts the third color supplemental light into light having one polarization state (either the first polarization state or the second polarization state, which is mainly illustrated by the light converted into the first polarization state), and the second light combining element 116 receives the third color supplemental light having the polarization state (e.g., the first polarization state) and guides (e.g., transmits) the third color supplemental light having the polarization state (e.g., the first polarization state) To the second spatial light modulator 130, the second spatial light modulator 130 modulates the third color supplemental light with polarization state according to an image signal (e.g., a correction image signal rl) to generate a third color image light and a third color non-image light, the third color image light is reflected to the image combining device 150, the light combining device 151 of the image combining device 150 receives the first color image light and the third color image light to combine the first color image light and the third color image light and provide the combined light to the lens assembly 152, and the lens assembly projects the first color image light and the third color image light to generate a first color image and a third color image.

Further, as shown in fig. 9, in the third period T3, the first color non-image light generated by the first spatial light modulator 120 is provided to the first switch absorber 161, the first switch absorber 161 emits the first color non-image light having a first polarization state, the first color non-image light emitted by the first switch absorber 161 is transmitted to the first polarization conversion element 162 via the first relay element 165, the first guide element, the first relay element 166, the first polarization conversion element 162 converts the first color non-image light into first color non-image light of a second polarization state, the first color non-image light of the second polarization state is transmitted to the first polarization combining element 163 by the first polarization conversion element 162, and the first color non-image light recovered by the first light recovery device 160 by the first polarization combining element 163 is reflected to the first color non-image light A spatial light modulator 120, said first spatial light modulator 120 being further capable of modulating said first color non-image light in accordance with said image signal (e.g. correction image signal b) to generate first color image light, said first color image light being provided to said image combining means 150 for further generating a first color image; the third color non-image light generated by the second spatial light modulator 130 is provided to the second switch-type absorber 171, the second switch-type absorber 171 emits a third color supplement light of the third color non-image light, the third color supplement light has a polarization state (such as a first polarization state), the third color supplement light emitted by the second switch-type absorber 171 is transmitted to the second polarization conversion element 172 through the second relay element 175, the second guiding element 174 and the second relay element 176, the second polarization conversion element 172 converts the third color supplement light into a third color supplement light of another polarization state, the third color supplement light of the another polarization state (such as a second polarization state) is transmitted to the second polarization combination element 173 by the second polarization conversion element 172, and the third color supplement light recovered by the second light recovery device 170 of the second polarization combination element 173 is reflected to the second space absorber 171 The inter-light modulator 130, the second spatial light modulator 120 may further modulate the third color supplement light according to image signals (such as the corrected image signals rl and r) to generate a third color image light and provide the third color image light to the image synthesis device 150 for further generating a third color image.

Referring to fig. 10, fig. 10 is a timing diagram of a second system adopted by the display device 100. In a first time period T1 of the modulation period T of one frame image, the excitation light source 111a emits a first color light (i.e., blue laser light), the wavelength conversion element 111b emits a third color fluorescence (i.e., red fluorescence light), so that the wavelength conversion system 111 emits the third color fluorescence light to the first light combining element 113, the first supplementary light source 112 emits a second color supplementary light (i.e., the green laser light) to the first light combining element 113, the first light combining element 113 reflects the third color fluorescence light to the light splitting device 140 and transmits the second color supplementary light to the light splitting device 140, the light splitting device 140 guides the third color fluorescence light to the second light combining element 116 and guides the second color supplementary light to the relay lens 101, the relay lens 101 transmits the second color supplementary light to the first polarization conversion device 114, the first polarization conversion device 114 converts the second color complementary light into a third color fluorescent light with a first polarization state and a second color complementary light, the first polarization combining element 163 receives the second color complementary light with the first polarization state emitted by the first polarization conversion device 114 and transmits the second color complementary light with the first polarization state to the first spatial light modulator 120, the first spatial light modulator 120 modulates the second color complementary light according to an image signal (such as a correction image signal gl) to generate a second color image light and a second color non-image light, the first spatial light modulator 120 further provides the received third color fluorescent light and the generated second color image light to the image synthesis device 150 for generating a second color image, the second complementary light source 115 is turned off, the second combining element 116 transmits the third color fluorescent light to the second polarization state through the relay lens 102 A polarization conversion device 117, the second polarization conversion device 117 converts the third color fluorescence into light with one polarization state (either the first polarization state or the second polarization state, which is mainly described in this embodiment as light converted into the first polarization state), the second light combining element 116 receives the third color fluorescence with the polarization state and guides (e.g. transmits) the third color fluorescence with the polarization state to the second spatial light modulator 130, the second spatial light modulator 130 modulates the third color fluorescence with the polarization state according to an image signal (e.g. a correction image signal r) to generate third color image light and third color non-image light, the third color image light is reflected to the image combining device 150, the light combining device 151 of the image combining device 150 receives the second color image light and the third color image light, combines the second color image light and the third color image light, and provides the combined second color image light and the third color image light to the lens A component 152 that projects the second color image light and the third color image light to generate a second color image and a third color image.

Further, as shown in fig. 10, in the first period T1, the second color non-image light generated by the first spatial light modulator 120 is provided to the first switch absorber 161, the first switch absorber 161 emits a second color supplement light of the second color non-image light, the second color supplement light has a first polarization state, the second color supplement light emitted by the first switch absorber 161 is transmitted to the first polarization conversion element 162 through the first relay element 165, the first guiding element, the first relay element 166, the first polarization conversion element 162 converts the second color supplement light into a second color supplement light of a second polarization state, the second color supplement light of the second polarization state is transmitted to the first polarization combination element 163 by the first polarization conversion element 162, and the second color supplement light recovered by the first light recovery device 160 by the first polarization combination element 163 is reflected to the first color supplement light The first spatial light modulator 120, the first spatial light modulator 120 can further modulate the second color supplement light according to the image signal (such as a corrected image signal gl) to generate a second color image light, and the second color supplement light is transmitted to the image synthesis device 150 for further generating a second color image; the third color non-image light (the third color fluorescent light) generated by the second spatial light modulator 130 is supplied to the second switching absorber 171, and the third color fluorescent light is absorbed by the second switching absorber 171, so that the second light recovery device 170 does not recover the third color light at this time in the first period T1.

As shown in fig. 10, in a second time period T2 of the modulation period T of one frame image, the excitation light source 111a emits a first color light (i.e., blue laser light), the wavelength conversion element 111b emits a second color fluorescence (i.e., green fluorescence), so that the wavelength conversion system 111 emits the second color fluorescence to the first light combining element 113, the first supplementary light source 112 is turned off, the first light combining element 113 reflects the second color fluorescence to the light splitting device 140, the light splitting device 140 guides (transmits) the second color fluorescence to the relay lens 101, the relay lens 101 transmits the second color fluorescence to the first polarization conversion device 114, the first polarization conversion device 114 converts the second color fluorescence into a second color fluorescence having a first polarization state, and the first polarization combining element 163 receives the second color fluorescence having the first polarization state emitted by the first polarization conversion device 114 And transmits the second color fluorescence with the first polarization state to the first spatial light modulator 120, the first spatial light modulator 120 modulates the second color fluorescence according to an image signal (e.g. an image signal g) to generate second color image light and second color non-image light, the first spatial light modulator 120 further provides the second color image light to the image synthesis device 150 for generating a second color image, the second supplemental light source 115 emits third color supplemental light (i.e. red laser light) to the second light combination element 116, the second light combination element 116 transmits the third color supplemental light to the second polarization conversion device 117 via the relay lens 102, the second polarization conversion device 117 converts the third color supplemental light into light with one polarization state (either the first polarization state or the second polarization state, which is mainly described in this embodiment as light converted into the first polarization state), the second light combining element 116 receives the third color complementary light with polarization state and directs (e.g. transmits) the third color complementary light with polarization state to the second spatial light modulator 130, the second spatial light modulator 130 modulates the third color supplement light with polarization state according to an image signal (such as a correction image signal rl) to generate a third color image light and a third color non-image light, the image light of the third color is reflected to the image combining device 150, the light combining device 151 of the image combining device 150 receives the image light of the second color and the image light of the third color to combine the image light of the second color and the image light of the third color and provide the combined light to the lens assembly 152, the lens assembly projects the second color image light and the third color image light to generate a second color image and a third color image.

Further, as shown in fig. 10, in the second period T2, the second color non-image light (which is second color fluorescence) generated by the first spatial light modulator 120 is supplied to the first switching absorber 161, and the first switching absorber 161 absorbs the second color fluorescence, and therefore, in the second period T2, the first light recovery device 160 does not perform recovery and utilization of the second color light; the third color non-image light generated by the second spatial light modulator 130 is provided to the second switch-type absorber 171, the second switch-type absorber 171 emits a third color supplement light of the third color non-image light, the third color supplement light has a polarization state (such as a first polarization state), the third color supplement light emitted by the second switch-type absorber 171 is transmitted to the second polarization conversion element 172 through the second relay element 175, the second guiding element 174 and the second relay element 176, the second polarization conversion element 172 converts the third color supplement light into a third color supplement light of another polarization state, the third color supplement light of the another polarization state (such as a second polarization state) is transmitted to the second polarization combination element 173 by the second polarization conversion element 172, and the third color supplement light recovered by the second light recovery device 170 of the second polarization combination element 173 is reflected to the second space absorber 171 The inter-light modulator 130, the second spatial light modulator 120 may further modulate the third color supplement light according to image signals (such as the corrected image signals rl and r) to generate a third color image light and provide the third color image light to the image synthesis device 150 for further generating a third color image.

As shown in fig. 10, in a third time period T3 of the modulation period T of one frame image, the excitation light source 111a emits a first color light (i.e. blue laser light), the wavelength conversion element 111b emits a first color light to the first light combining element 113, the first supplemental light source 112 is turned off, the first light combining element 113 reflects the first color light to the light splitting device 140, the light splitting device 140 guides (e.g. transmits) the first color light to the relay lens 101, the relay lens 101 transmits the first color light to the first polarization conversion device 114, the first polarization conversion device 114 converts the first color light into a first color light having a first polarization state, the first polarization combining element 163 receives the first color light having the first polarization state emitted by the first polarization conversion device 114 and transmits the first color light having the first polarization state to the first spatial light modulator 120, the first spatial light modulator 120 modulates the first color light according to an image signal (e.g., an image signal b) to generate a first color image light and a first color non-image light, the first spatial light modulator 120 further provides the first color image light to the image synthesis device 150 for generating a first color image, the second supplemental light source 115 emits a third color supplemental light (i.e., red laser light) to the second light combining element 116, the second light combining element 116 reflects the third color supplemental light to the relay lens 102, the relay lens 102 transmits the third color supplemental light to the second polarization conversion device 117, the second polarization conversion device 117 converts the third color supplemental light into light having a polarization state (both the first polarization state and the second polarization state, which is mainly illustrated in this embodiment by light converted into the first polarization state), the second light combining element 116 receives the third color supplement light with polarization state (e.g. the first polarization state) and directs (e.g. transmits) the third color supplement light with polarization state to the second spatial light modulator 130, the second spatial light modulator 130 modulates the third color supplement light with polarization state according to an image signal (such as a correction image signal rl) to generate a third color image light and a third color non-image light, the image light of the third color is reflected to the image synthesis apparatus 150, the light combination apparatus 151 of the image synthesis apparatus 150 receives the image light of the first color and the image light of the third color to combine the image light of the first color and the image light of the third color and provide the combined light to the lens assembly 152, the lens component 152 projects the first color image light and the third color image light to generate a first color image and a third color image.

Further, as shown in fig. 10, in the third period T3, the first color non-image light generated by the first spatial light modulator 120 is provided to the first switch absorber 161, the first switch absorber 161 emits the first color non-image light having a first polarization state, the first color non-image light emitted by the first switch absorber 161 is transmitted to the first polarization conversion element 162 via the first relay element 165, the first guide element, the first relay element 166, the first polarization conversion element 162 converts the first color non-image light into first color non-image light of a second polarization state, the first color non-image light of the second polarization state is transmitted to the first polarization combining element 163 by the first polarization conversion element 162, and the first polarization combining element 163 reflects the first color non-image light recovered by the first light recovery device 160 to the first color non-image light A spatial light modulator 120, said first spatial light modulator 120 being further capable of modulating said first color non-image light in accordance with said image signal (e.g. correction image signal b) to generate first color image light, said first color image light being provided to said image combining means 150 for further generating a first color image; the third color non-image light generated by the second spatial light modulator 130 is provided to the second switch-type absorber 171, the second switch-type absorber 171 emits a third color supplement light of the third color non-image light, the third color supplement light has a polarization state (such as a first polarization state), the third color supplement light emitted by the second switch-type absorber 171 is transmitted to the second polarization conversion element 172 through the second relay element 175, the second guiding element 174 and the second relay element 176, the second polarization conversion element 172 converts the third color supplement light into a third color supplement light of another polarization state, the third color supplement light of the another polarization state (such as a second polarization state) is transmitted to the second polarization combination element 173 by the second polarization conversion element 172, and the third color supplement light recovered by the second light recovery device 170 of the second polarization combination element 173 is reflected to the second space absorber 171 The inter-light modulator 130, the second spatial light modulator 120 may further modulate the third color supplement light according to image signals (such as the corrected image signals rl and r) to generate a third color image light and provide the third color image light to the image synthesis device 150 for further generating a third color image.

Referring to fig. 11, fig. 11 is a timing diagram of a third system adopted by the display apparatus 100, in a first time period T1 of a modulation period T of one frame of image, the excitation light source 111a is turned off, so that the wavelength conversion system 111 is turned off, the first supplemental light source 112 emits second color supplemental light (i.e., the green laser light) to the first light combining element 113, the first light combining element 113 transmits the second color supplemental light to the relay lens 101 via the light splitting device 140, the relay lens 101 transmits the second color supplemental light to the first polarization conversion device 114, the first polarization conversion device 114 converts the second color supplemental light into second color supplemental light with a first polarization state, and the first polarization light combining element 163 receives the second color supplemental light with the first polarization state emitted by the first polarization conversion device 114 and transmits the second color supplemental light with the first polarization state to the first polarization device 114 A spatial light modulator 120, the first spatial light modulator 120 modulates the second color supplementary light according to an image signal (e.g. a corrected image signal gl) to generate a second color image light and a second color non-image light, the second color image light is guided (e.g. transmitted) to the image synthesizing device 150 for generating a second color image, the second supplementary light source 115 emits a third color supplementary light (i.e. red laser light) to the second light combining element 116, the second light combining element 116 combines the third color supplementary light, the third color supplementary light is transmitted to the second polarization conversion device 117 via the relay lens 102, the second polarization conversion device 117 converts the third color supplementary light into light with a polarization state (either a first polarization state or a second polarization state, which is mainly illustrated in this embodiment by light converted into the first polarization state), the second light combining element 116 receives the third color complementary light with polarization state and directs (e.g. transmits) the third color complementary light with polarization state to the second spatial light modulator 130, the second spatial light modulator 130 modulates the third color supplement light with polarization state according to an image signal (such as a correction image signal rl) to generate a third color image light and a third color non-image light, the image light of the third color is reflected to the image combining device 150, the light combining device 151 of the image combining device 150 receives the image light of the second color and the image light of the third color to combine the image light of the second color and the image light of the third color and provide the combined light to the lens assembly 152, the lens assembly projects the second color image light and the third color image light to generate a second color image and a third color image.

Further, as shown in fig. 11, in the first period T1, the second color non-image light generated by the first spatial light modulator 120 is provided to the first switch absorber 161, the first switch absorber 161 emits a second color supplement light of the second color non-image light, the second color supplement light has a first polarization state, the second color supplement light emitted by the first switch absorber 161 is transmitted to the first polarization conversion element 162 through the first relay element 165, the first guiding element, the first relay element 166, the first polarization conversion element 162 converts the second color supplement light into a second color supplement light of a second polarization state, the second color supplement light of the second polarization state is transmitted to the first polarization combination element 163 by the first polarization conversion element 162, and the second color supplement light recovered by the first light recovery device 160 by the first polarization combination element 163 is reflected to the first color supplement light The first spatial light modulator 120, the first spatial light modulator 120 can further modulate the second color supplement light according to the image signal (such as the corrected image signal gl) to generate a second color image light, the second color image light is guided to the image synthesis device 150 for further generating a second color image; the third color non-image light generated by the second spatial light modulator 130 is provided to the second switch-type absorber 171, the second switch-type absorber 171 emits a third color supplement light of the third color non-image light, the third color supplement light has a polarization state (such as a first polarization state), the third color supplement light emitted by the second switch-type absorber 171 is transmitted to the second polarization conversion element 172 through the second relay element 175, the second guiding element 174 and the second relay element 176, the second polarization conversion element 172 converts the third color supplement light into a third color supplement light of another polarization state (such as a second polarization state), the third color supplement light of the another polarization state is transmitted to the second polarization combination element 173 by the second polarization conversion element 172, and the third color supplement light recovered by the second light recovery device 170 of the second polarization combination element 173 is reflected to the second space absorber 171 The inter-light modulator 130, the second spatial light modulator 120 may further modulate the third color supplement light according to image signals (such as the corrected image signals rl and r) to generate a third color image light and provide the third color image light to the image synthesis device 150 for further generating a third color image.

As shown in fig. 11, during a second time period T2 of the modulation period T of one frame image, the excitation light source 111a is turned off, so that the wavelength conversion system 111 is turned off, the first supplemental light source 112 emits second color supplemental light (i.e. the green laser light) to the first light combining element 113, the first light combining element 113 transmits the second color supplemental light to the relay lens 101 via the light splitting device 140, the relay lens 101 transmits the second color supplemental light to the first polarization conversion device 114, the first polarization conversion device 114 converts the second color supplemental light into second color supplemental light having a first polarization state, the first polarization combining element 163 receives the second color supplemental light having the first polarization state emitted by the first polarization conversion device 114 and transmits the second color supplemental light having the first polarization state to the first spatial light modulator 120, the first spatial light modulator 120 modulates the second color supplementary light according to an image signal (such as an image signal g and a corrected image signal gl) to generate a second color image light and a second color non-image light, the first spatial light modulator 120 further provides the second color image light to the image synthesizing device 150 for generating a second color image, the second supplementary light source 115 emits a third color supplementary light (i.e. red laser light) to the second light combining element 116, the second light combining element 116 transmits the third color supplementary light to the second polarization conversion device 117 through the relay lens 102, the second polarization conversion device 117 converts the third color supplementary light into light having one polarization state (either the first polarization state or the second polarization state, which is mainly illustrated by the conversion into light having the first polarization state), the second light combining element 116 receives the third color complementary light with polarization state and directs (e.g. transmits) the third color complementary light with polarization state to the second spatial light modulator 130, the second spatial light modulator 130 modulates the third color supplement light with polarization state according to an image signal (such as a correction image signal rl) to generate a third color image light and a third color non-image light, the image light of the third color is reflected to the image combining device 150, the light combining device 151 of the image combining device 150 receives the image light of the second color and the image light of the third color to combine the image light of the second color and the image light of the third color and provide the combined light to the lens assembly 152, the lens assembly projects the second color image light and the third color image light to generate a second color image and a third color image.

Further, as shown in fig. 11, in the second period T2, the second color non-image light generated by the first spatial light modulator 120 is provided to the first switch absorber 161, the first switch absorber 161 emits second color supplement light of the second color non-image light, the second color supplement light has a first polarization state, the second color supplement light emitted by the first switch absorber 161 is transmitted to the first polarization conversion element 162 via the first relay element 165, the first guide element, the first relay element 166, the first polarization conversion element 162 converts the second color supplement light into second color supplement light of a second polarization state, the second color supplement light of the second polarization state is transmitted to the first polarization combination element 163 by the first polarization conversion element 162, and the second color supplement light recovered by the first light recovery device 160 is reflected to the first polarization combination element 163 The first spatial light modulator 120, the first spatial light modulator 120 can further modulate the second color supplement light according to the image signal (such as the corrected image signal gl) to generate a second color image light, the second color image light is provided to the image synthesis device 150 for further generating a second color image; the third color non-image light generated by the second spatial light modulator 130 is provided to the second switch-type absorber 171, the second switch-type absorber 171 emits a third color supplement light of the third color non-image light, the third color supplement light has a polarization state (such as a first polarization state), the third color supplement light emitted by the second switch-type absorber 171 is transmitted to the second polarization conversion element 172 through the second relay element 175, the second guiding element 174 and the second relay element 176, the second polarization conversion element 172 converts the third color supplement light into a third color supplement light of another polarization state, the third color supplement light of the another polarization state (such as a second polarization state) is transmitted to the second polarization combination element 173 by the second polarization conversion element 172, and the third color supplement light recovered by the second light recovery device 170 of the second polarization combination element 173 is reflected to the second space absorber 171 The inter-light modulator 130, the second spatial light modulator 120 may further modulate the third color supplement light according to an image signal (e.g. a corrected image signal rl) to generate a third color image light and provide the third color image light to the image synthesizing device 150 for further generating a third color image.

As shown in fig. 11, in a third time period T3 of the modulation period T of one frame image, the excitation light source 111a emits a first color light (i.e. blue laser light), the wavelength conversion element 111b emits a first color light to the first light combining element 113, the first supplemental light source 112 is turned off, the first light combining element 113 reflects the first color light to the light splitting device 140, the light splitting device 140 guides (transmits) the first color light to the relay lens 101, the relay lens 101 transmits the first color light to the first polarization conversion device 114, the first polarization conversion device 114 converts the first color light into a first color light having a first polarization state, the first polarization combining element 163 receives the first color light having the first polarization state emitted by the first polarization conversion device 114 and transmits the first color light having the first polarization state to the first spatial light modulator 120, the first spatial light modulator 120 modulates the first color light according to an image signal (e.g., an image signal b) to generate a first color image light and a first color non-image light, the first spatial light modulator 120 further provides the first color image light to the image synthesis device 150 for generating a first color image, the second supplemental light source 115 emits a third color supplemental light (i.e., red laser light) to the second light combining element 116, the second light combining element 116 reflects the third color supplemental light to the relay lens 102, the relay lens 102 transmits the third color supplemental light to the second polarization conversion device 117, the second polarization conversion device 117 converts the third color supplemental light into light having a polarization state (both the first polarization state and the second polarization state, which is mainly illustrated in this embodiment by light converted into the first polarization state), the second light combining element 116 receives the third color supplement light with polarization state (e.g. the first polarization state) and directs (e.g. transmits) the third color supplement light with polarization state to the second spatial light modulator 130, the second spatial light modulator 130 modulates the third color supplement light with polarization state according to an image signal (such as a correction image signal rl) to generate a third color image light and a third color non-image light, the image light of the third color is reflected to the image synthesis apparatus 150, the light combination apparatus 151 of the image synthesis apparatus 150 receives the image light of the first color and the image light of the third color to combine the image light of the first color and the image light of the third color and provide the combined light to the lens assembly 152, the lens assembly projects the first color image light and the third color image light to generate a first color image and a third color image.

Further, as shown in fig. 11, in the third period T3, the first color non-image light generated by the first spatial light modulator 120 is provided to the first switch absorber 161, the first switch absorber 161 emits the first color non-image light having a first polarization state, the first color non-image light emitted by the first switch absorber 161 is transmitted to the first polarization conversion element 162 via the first relay element 165, the first guide element, the first relay element 166, the first polarization conversion element 162 converts the first color non-image light into first color non-image light of a second polarization state, the first color non-image light of the second polarization state is transmitted to the first polarization combining element 163 by the first polarization conversion element 162, and the first color non-image light recovered by the first light recovery device 160 by the first polarization combining element 163 is reflected to the first color non-image light A spatial light modulator 120, said first spatial light modulator 120 being further capable of modulating said first color non-image light in accordance with said image signal (e.g. correction image signal b) to generate first color image light, said first color image light being provided to said image combining means 150 for further generating a first color image; the third color non-image light generated by the second spatial light modulator 130 is provided to the second switch-type absorber 171, the second switch-type absorber 171 emits a third color supplement light of the third color non-image light, the third color supplement light has a polarization state (such as a first polarization state), the third color supplement light emitted by the second switch-type absorber 171 is transmitted to the second polarization conversion element 172 through the second relay element 175, the second guiding element 174 and the second relay element 176, the second polarization conversion element 172 converts the third color supplement light into a third color supplement light of another polarization state, the third color supplement light of the another polarization state (such as a second polarization state) is transmitted to the second polarization combination element 173 by the second polarization conversion element 172, and the third color supplement light recovered by the second light recovery device 170 of the second polarization combination element 173 is reflected to the second space absorber 171 The inter-light modulator 130, the second spatial light modulator 120 may further modulate the third color supplement light according to image signals (such as the corrected image signals rl and r) to generate a third color image light and provide the third color image light to the image synthesis device 150 for further generating a third color image.

It can be understood that, as shown in fig. 9, 10, and 11, the display device 100 may control the switching timing of each

light source

111a, 112, and 115 and the modulation timing of the first and second spatial

light modulators

120 and 130 according to the requirement of the dynamic color gamut (e.g., by determining the color gamut of the image to be displayed according to the image data), so as to change the switching time duration of each

light source

111a, 112, and 115, and achieve the purpose of increasing or decreasing the ratio of fluorescence/laser light, or time-sharing modulating the fluorescence laser light, so as to display the image more accurately.

Further, for the display device 100 according to the present invention, it is verified that the color gamut of REC 2020 can be achieved by adding a small amount of red and green laser light. Referring to fig. 12, fig. 12 is a schematic diagram of the technical color gamut and color volume expansion measured by the display device 100 shown in fig. 5. Specifically, it was measured that the color gamut can be expanded to the range of rec.2020 by adding the green laser light and the red laser light with the brightness of 5%, wherein the peripheral shaded area shown in fig. 12 is the expanded color gamut range of the display device compared with the color gamut range of the common DCI-P3, and thus the display effect of the display device 100 is better.

And furthermore, the second color supplement light and the third color supplement light are green laser and red laser, and the pure laser has better monochromaticity, so that the color gamut is wider and the price is more expensive, and the brightness of the picture pure laser can be enhanced while the cost is saved by recovering the pure laser.

Taking red laser as an example, assuming that there are 10000 pixels in the effective picture, each pixel has 256 gray levels (0-255), and we refer to a red picture with all pixels RGB gray levels (255, 0, 0) in a frame as 2550000 "units" of red light, regardless of diffraction loss and other losses. If only 1200000 "units" of red laser light are needed in a frame, the utilization rate of the red laser light is only 47% without the light recycling system, but after the light recycling system is added, when the red laser light is recycled only once, the utilization rate is increased to 71.9%, that is, the brightness of the red laser pixel on the frame is increased by 53% without increasing the power consumption of the laser.

In addition, the display device 100 of the present invention has the first and second spatial

light modulators

120 and 130, and the two-chip DMD system can improve the situation that the brightness is insufficient or a certain color is insufficient in the monolithic DMD system, and in an embodiment, the display device 100 of the present invention can adopt one of the spatial light modulators (120 or 130) to process red light alone, so that the problem of insufficient red light can be greatly improved, and the picture color is more vivid. Because pure laser's monochromaticity is better, can make the colour gamut scope wider, and the price is more expensive, and fluorescence is high nevertheless colour difference, can reduce the colour gamut scope, consequently all add first and second on-off absorber in two light cycle systems and guarantee that only pure laser of recovery.

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 performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. A display device, characterized in that the display device comprises a light source device, a first spatial light modulator, a second spatial light modulator, a first light recovery device and a second light recovery device,

the light source device is used for emitting first color light, second color fluorescence, second color supplementary light, third color fluorescence and third color supplementary light;

The first spatial light modulator is configured to receive the first color light, the second color fluorescence, and the second color supplementary light emitted by the light source device, and modulate the first color light to generate a first color image light and modulate the first color image light. The second color fluorescent light and the second color supplementary light generate the second color image light and non-image light;

The second spatial light modulator is used for receiving the third color supplementary light and the third color fluorescence emitted by the light source device, and modulating the third color fluorescence and the third color supplementary light to generate a third color image light and non-image light, the first color image light emitted by the first spatial light modulator is combined with the second color image light and the third color image light emitted by the second spatial light modulator to display an image;

The first light recycling device is used for recycling the first color light and the second color supplementary light in the non-image light generated by the first spatial light modulator to the first spatial light modulator for reuse;

The second light recycling device is used for recycling the third color supplementary light in the non-image light generated by the second spatial light modulator to the second spatial light modulator for reuse;

The light source device includes a wavelength conversion system, a light splitting device, a first supplementary light source, a first light combining element, and a first polarization conversion device. The wavelength conversion system includes an excitation light source and a wavelength conversion element, and the excitation light source is used to emit excitation light. The wavelength conversion element is used to convert a part of the excitation light into the second color fluorescence and the third color fluorescence, and the wavelength conversion system converts the second color fluorescence and the third color fluorescence converted by the wavelength conversion element. Three-color fluorescence is provided to the first light combining element, and another part of the excitation light is also provided to the first light combining element as the first color light, and the first supplementary light source is used for emitting the The second color supplements the light to the first light combining element, and the first light combining element is used to combine the first color light, the second color fluorescence and the third color fluorescence with the second color The supplemented photosynthetic light is provided to the light splitting device, and the light splitting device is used for guiding the first color light, the second color fluorescence and the second color supplementary light to the first spatial light modulator and guiding the third color fluorescence to the second spatial light modulator; the first polarization conversion device is located between the first light combining element and the first spatial light modulator for converting the The first color light, the second color fluorescence and the second color supplementary light emitted by the spectroscopic device are converted into the first color light, the second color fluorescence and the second color of the first polarization state The color complements the light.

2 . The display device of claim 1 , wherein the first light recycling device comprises a first switch-mode absorber for absorbing or blocking the non-image light. 3 . The second color of fluorescent light in the non-image light is recovered by the first light recycling device to the first spatial light modulator for reuse.

3 . The display device according to claim 2 , wherein the first light recovery device comprises a first polarization light combining element and a first polarization converting element, and the first polarization light combining element is used to convert the The first color light, the second color fluorescence and the second color supplementary light of the first polarization state emitted by the light source device are guided to the first spatial light modulator, and the first polarization conversion element is used for converting the first color The polarization states of the first color light in the non-image light of a color and the supplementary light of the second color in the non-image light of the second color are converted into the second polarization state, and the non-image light of the first color of the second polarization state The first color light in and the second color complementary light in the second color non-image light are directed to the first polarization light combining element, which also adds the second polarization state The first color light of the first color non-image light and the second color complementary light of the second color non-image light are guided to the first spatial light modulator for re-modulation.

4. The display device of claim 3, wherein the second light recycling device comprises a second switch-type absorber, and the second switch-type absorber is used for absorbing or blocking the third color The third color fluorescence in the image light, and the third color supplementary light in the third color non-image light are recovered by the second light recycling device to the second spatial light modulator for reuse.

5. The display device of claim 4, wherein the first switchable absorber comprises a narrowband filter; and the second switchable absorber comprises a narrowband filter.

6. The display device according to claim 4, wherein the second light recovery device comprises a second polarization light combining element and a second polarization converting element, and the second polarization light combining element is used to combine a The third color fluorescent light in the polarization state and the third color complementary light are guided to the second spatial light modulator, and the second polarization conversion element is used to complement the third color in the third color non-image light The polarization state of the light is converted to another polarization state, and the third color complementary light in the third color non-image light of the other polarization state is guided to the second polarization light combining element, and the second polarization The light combining element also directs the third color complementary light in the third color non-image light of the other polarization state to the second spatial light modulator for re-modulation.

7 . The display device according to claim 1 , wherein the light source device further comprises a second supplementary light source, a second light combining element, and a second polarization conversion device, and the second light combining element is located in the On the optical path between the light splitting device and the second spatial light modulator, the light splitting device is used to emit the third color fluorescence to the second light combining element, and the second supplementary light source is used to emit the The third color supplementary light is supplied to the second light combining element, and the second light combining element is used to provide the third color fluorescence and the third color supplementary photocombined light to the second spatial light modulator The second polarization conversion device is located between the second light combining element and the second spatial light modulator, and is used for converting the third color supplementary light emitted by the second light combining element into the first The third color supplemental light of a polarization state.

8 . The display device according to claim 1 , wherein the display device comprises an image synthesizing device, the image synthesizing device comprises a light combining device and a lens assembly, and the light combining device is used to combine the first The first color image light and the second color image light emitted by the spatial light modulator and the third color image light emitted by the second spatial light modulator are combined into light, and the lens assembly is used for combining the first color image light emitted by the light combining device. A color image light, a second color image light and a third color image light are projected to display an image.

9 . The display device of claim 1 , wherein the first color light, the second color supplementary light and the third color supplementary light are all lasers; the first color is blue, and the The second color is one of green and red, and the third color is the other of green and red.