WO2020135292A1 - Display device and control method therefor - Google Patents

Abstract

Provided are a display device (100, 200, 300) and a control method therefor. The display device (100, 200, 300) comprises: a control apparatus (190) for converting original image data based on three primary colors of each pixel in each frame of image to be displayed into pixel modulation data based on four primary colors of each pixel; a light source system (110, 210, 310) for emitting four primary colors of light corresponding to the four primary colors, wherein the four primary colors of light comprise three primary colors of laser and a primary color of fluorescent light; and a light modulation apparatus (180, 380) for modulating the four primary colors of light emitted from the light source system (110, 210, 310) according to the pixel modulation data based on the four primary colors of each pixel in each frame of image to be displayed, thereby obtaining image light of the image to be displayed. The image is modulated by using three primary colors of laser, wherein the color gamut displayed by the laser in the three primary colors of light can completely cover the color gamut that can be achieved by a solid color exciting light source, and the addition of fluorescent light as a primary color light can reduce speckle contrast while achieving the required brightness more efficiently.

Description

Display device and its control method Technical field

The invention relates to the field of display technology, in particular to a display device and a control method thereof.

Background technique

This section is intended to provide background or context for the specific implementation of the invention as set forth in the claims. The description here is not admitted to be prior art because it is included in this section.

The light sources of laser projection equipment are divided into two categories. One is to excite phosphors of different colors by short-wavelength laser light to produce primary colors of red, green and blue. The other type directly uses the red, green and blue lasers as the three primary color light sources.

For the laser-excited phosphor solution, because the gallium nitride-based semiconductor blue laser has the characteristics of high efficiency, long life, and stable operation, the scheme of using the blue semiconductor laser to excite the fluorescent pink wheel has long life, high efficiency, stable system, and cost Low characteristics. However, due to the wide spectrum of the fluorescence generated by the phosphor, the color gamut of this scheme is relatively narrow. As shown in Figure 1, the projection equipment that generally uses this technology can basically cover the sRGB color gamut. Through some enhancement processing, such as adding a narrow-band optical filter to remove the yellow light spectrum in green and red light, it can enhance its color gamut to achieve DCI-P3 color gamut. But narrow-band filtering will lose a considerable amount of light, which greatly reduces the efficiency of the system.

On the other hand, the projection system that directly uses the red, green, and blue lasers as the three primary color light sources, because the RGB laser has a good monochromaticity, and thus has a very wide color gamut range. The projection system using RGB laser can easily reach the color gamut standard of REC 2020. RGB laser projection systems also have many shortcomings. The first disadvantage is speckle. Speckle is due to the coherence of the laser, which causes the light reflected on the projection plane to interfere due to the phase difference caused by the fluctuation of the plane, resulting in uneven brightness distribution in the projection screen. Although there are many inventions trying to solve the problem of laser speckle, the results are not ideal. The second disadvantage is the high cost of the RGB system. This is because the red and green lasers in RGB are not mature under the current technology. The efficiency of semiconductor green lasers can currently only reach below 20%, which is much lower than that of gallium nitride substrate blue lasers and ternary substrate red lasers, and the cost is very high. Although the efficiency of the red laser can be similar to that of the blue laser, the temperature stability of the red laser is poor. Not only does the efficiency decrease significantly with increasing temperature, but the center wavelength also drifts. These two points make the RGB laser system have color cast with temperature changes. This requires adding a constant temperature device to the red laser to stabilize the working state of the red laser. In high-brightness projection equipment, this also means that a high-power cooling device is required to ensure the stable operating temperature of the red laser, thereby greatly increasing the cost of the RGB laser projection system.

Summary of the invention

An aspect of the present invention provides a display device, including:

A control device for converting the original image data based on the three primary colors of each pixel in each image to be displayed into the pixel modulation data based on the four primary colors of each pixel;

A light source system for emitting four primary colors of light corresponding to the four primary colors, wherein the four primary colors of light include three primary colors of laser light and one primary color of fluorescence; and

The light modulation device is used to modulate the four primary colors of light emitted by the light source system according to the pixel modulation data of each pixel in each frame of the image to be displayed, so as to obtain the image light of the image to be displayed.

Another aspect of the present invention provides a control method of a display device, including the following steps:

Convert the original image data based on the three primary colors of each pixel in each image to be displayed into pixel modulation data based on the four primary colors;

Use the light source system to emit four primary colors of light corresponding to the four primary colors, where the four primary colors of light include three primary colors of laser light and one primary color of fluorescence; and

The light modulation device modulates the four primary colors of light emitted by the light source system according to pixel modulation data of each pixel in each frame of the image to be displayed, thereby obtaining image light of the image to be displayed.

In the present invention, three primary colors of laser light are used to modulate the image. Among them, the color gamut displayed by the laser light in the three primary colors can completely cover the color gamut that can be achieved by the solid color excitation light source, and the addition of fluorescence as the primary color light can be more To achieve the required brightness efficiently, the present invention makes full use of the high-efficiency, non-speckle and low-cost characteristics of fluorescence, mixing the fluorescence with the laser to make the output image have a lower speckle contrast, which is beneficial to alleviate the cause of the laser Speckle effect has a good display effect.

BRIEF DESCRIPTION

In order to more clearly explain the technical solutions of the embodiments/modes of the present invention, the drawings required in the description of the embodiments/modes will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present invention / Way, for a person of ordinary skill in the art, without paying any creative labor, other drawings can also be obtained based on these drawings.

Figure 1 is a comparison chart of laser fluorescence color gamut and standard color gamut.

2 is a schematic structural diagram of a display device provided in a first embodiment of the present invention.

FIG. 3 is a schematic structural view of the wavelength conversion device shown in FIG. 2.

4 is a schematic structural diagram of a display device provided in a second embodiment of the present invention.

FIG. 5 is a schematic structural view of the wavelength conversion device shown in FIG. 4.

6 is a schematic structural diagram of a display device provided in a third embodiment of the present invention.

Symbol description of main components

display screen	100, 200, 300
Light source system	110, 210, 310
First illuminant	111, 211
Second illuminant	112, 212
Third illuminant	113, 213
Fourth illuminant	313a
First guide element	114, 214, 314
Wavelength conversion device	115, 215, 315
Drive unit	115a, 215a
Substrate	115b, 215b, 315b
Transition zone	Y
Reflection zone	115c, 215c
Transmission area	115d

Collection lens group	116
Second guide element	117, 217, 317
Relay lens	118
Uniform light device	119
Light modulation device	180, 380
TIR prism	181
Control device	190
Lens device	192

The following specific embodiments will further illustrate the present invention with reference to the above drawings.

detailed description

In order to be able to understand the above objects, features and advantages of the present invention more clearly, the present invention will be described in detail below with reference to the drawings and specific embodiments. It should be noted that, in the case of no conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

In the following description, many specific details are set forth in order to fully understand the present invention. The described embodiments are only a part of the embodiments of the present invention, but not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present invention.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field of the present invention. The terminology used in the description of the present invention herein is for the purpose of describing specific embodiments, and is not intended to limit the present invention.

Referring to FIG. 2, the first embodiment of the present invention provides a display device 100 including a light source system 110, a light modulation device 180 and a control device 190. The light source system 110 is used to emit four primary colors of light, wherein the four primary colors of light include three primary colors of laser light and one primary color of fluorescence; the control device 190 is used to display the three primary colors of each pixel in each frame of the image to be displayed The original image data is converted into pixel modulation data based on the four primary colors, and the four primary colors on which the pixel modulation data are based correspond to the color coordinates of the four primary colors of light emitted by the light source system 110; the light modulation device 180 is used to display each frame of the image to be displayed. The pixel modulation data of each pixel modulates the four primary colors of light emitted by the light source system 110, so as to obtain the image light of the image to be displayed.

In this embodiment, the four primary colors of light emitted by the light source system 110 may be RGB laser and yellow fluorescence, that is, the four primary colors of light are red laser, green laser, blue laser, and yellow fluorescence. In one embodiment, the four primary colors of light are magenta laser, cyan laser, blue laser, and yellow fluorescence. It can be understood that the four primary colors of light can also be a combination of laser and fluorescence of other colors. This is limited.

The control device 190 is used to read the original image data based on the three primary colors of each pixel in each frame of the image to be displayed in the image source. Further, in this embodiment, the original image data of each pixel of each frame of the image to be displayed It is an RGB encoding format, but it can be understood that in a modified embodiment, the original image data of each pixel of the image to be displayed is not limited to the RGB encoding format, such as YUV, XYZ encoding format, or the like. Further, the original image data of each pixel of the image to be displayed in each frame includes original image data based on three primary colors, such as red original image data r _s , green original image data g _s, and blue original image data b _s . In one embodiment, r _s , g _s , and b _s can be characterized by gray scale values. For example, the original image data r _s , g _s , and b _s of the three primary colors of one pixel can be gray scale values of 100, 120, 150.

Further, the original image data based on the three primary colors of each pixel of each frame of the image to be displayed includes the color gamut range to which the original image data of each pixel of each frame of the image to be displayed belongs has been Know or can know. Specifically, in one embodiment, in addition to the original image data of the three primary colors of each pixel, the original image data of each pixel of the image to be displayed in the frame may also include the color gamut range information to which it belongs, and the control device 190 receives any After the original image data of each pixel of the image to be displayed in a frame, the color gamut range to which the original image data of each pixel of the image to be displayed in the frame belongs can be obtained according to the color gamut range information. The color coordinates of the primary colors in different color gamuts are different. For example, the three primary RGB colors specified in the REC 2020 color gamut standard are (0.708, 0.292, 0.2627), (0.17, 0.797, 0.6780), (0.131, 0.046, 0.0593).

Among them, the color coordinates (x _r , y _r , Y _r ) of the three primary colors of light r ₀ , g ₀ , and b ₀ in the xyY coordinate system to which the original image data of each pixel in each frame of the image to be displayed belong, (x _g ,y _g ,Y _g ), (x _b ,y _g ,Y _g ) can be expressed by the following formula 1:

It can be understood that the xyY coordinate system can be defined by the CIE 1937 standard. CIE 1937 defines the absolute color and the brightness of the color that can be distinguished by any human eye with a three-dimensional vector, which does not change as the color gamut changes. As before, the color gamut range information to which the original image data of each pixel of each frame of the image to be displayed belongs is known or can be known, that is, the color gamut range to which the original image data of each pixel in each frame of the image to be displayed belongs is The color coordinates (x _r , y _r , Y _r ), (x _g , y _g , Y _g ), (x _b , y _b , Y _b ) of the three primary colors r ₀ , g ₀ , b ₀ under xyY coordinates are Known or available.

Further, the tristimulus values X, Y and Z of the pixels calculated according to the original image data r _s , g _s and b _s of each pixel in the image to be displayed in the frame are as shown in Equation 2:

Among them, the color conversion matrix C of the three primary colors corresponding to the color gamut to which the image to be displayed corresponds corresponds to the color gamut range to which the original image data belongs, which is calculated based on the original image data of any pixel and the color gamut range information to which it belongs The color conversion matrix required for the stimulus values X, Y, Z conforms to the following formula 3:

It can be seen from Equation 3 that the color conversion matrix C is the color coordinates (x _r , y _r , Y _r ) of the three primary colors r ₀ , g ₀ , and b ₀ in the xyY coordinates corresponding to the color gamut of the original image data of any pixel. , (X _g , y _g , Y _g ), (x _b , y _b , Y _b ) are determined. Specifically, in one embodiment, the color gamut range information of the original image data of the image to be displayed in the frame may include a color conversion matrix C, that is, in addition to the original image data based on the three primary colors, the image to be displayed in the frame The original image data may store the color conversion matrix C based on the three primary colors as the color gamut range information of the original image data of the image to be displayed in the frame, but in a modified embodiment, the original image data of the image to be displayed in the frame belongs to the color The range information of the domain can also be the color coordinates (x _r , y _r , Y _r ), (x _g , y _g , Y _g ), (x _b , y _b , Y) of the three primary colors r ₀ , g ₀ , b _{0 b} ) The information or the specific characters or codes representing the color gamut range information are not limited to the above.

Further, according to the above formulas 1, 2, and 3, it can be known that according to the three primary color original image data r _s , g _s , b _{s of} any pixel and the color gamut range information to which they belong, the three primary color original image data r of any pixel The color gamut range information to which _s , g _s , and b _s belong is the color coordinates (x _r , y _r , Y _r ), (x _g , y _g , Y _g ) of the three primary colors r ₀ , g ₀ , and b ₀ , (x _b , y _b , Y _b ), the tristimulus values X, Y, Z of any pixel can be calculated and obtained.

For the display device 100, it stores a color conversion matrix C'based on the four primary colors, wherein the color conversion matrix C'based on the four primary colors and the color coordinates of the four primary colors emitted from the light source system 110 in the xyY coordinate system Related.

The color coordinates of the four primary color lights r ₀ ′, g ₀ ′, b ₀ ′, y ₀ ′ provided by the light source system 110 to the light modulation device 180 are (x _r ′, y _r ′, Y _r ′), (x _g ',y _g ',Y _g '), (x _b ',y _b ',Y _b '), (x _y ',y _y ',Y _y '). It can be understood that, for the display device 100, when the primary color light emitted by the light source system 110 is fixed, the color gamut range of the image obtained by using the pixel modulation data in each frame of the image to be displayed is also known, that is, the light source system 110 The range of color gamut that the emitted primary light can display. The color coordinates of the four primary colors r ₀ ', g ₀ ', b ₀ ', y ₀ '(x _r ', y _r ', Y _r '), (x _g ', y _g ', Y _g '), (x _b ', y _b ', Y _b '), (x _y ', y _y ', Y _y ') can be obtained by measuring the color gamut range of the primary color light emitted by the light source system 110.

The control device 190 is used to determine the color conversion matrix C of the three primary colors corresponding to the color gamut to which the original image data of each pixel based on the three primary colors belongs, and the three primary colors based on each pixel The color conversion matrix C′ of the four primary colors corresponding to the color gamut to which the original image data belongs is calculated, and the modulation data r′, g′, b′, y′ of each pixel based on the four primary colors are calculated. In the case where the primary light emitted by the light source system 110 is fixed, the color conversion matrix C′ of the display device 10 based on the four primary colors is also fixed, for example, the color conversion matrix C′ can be stored in advance during the manufacturing process of the display device 10, This allows the display device 10 to generate pixel modulation data using the color conversion matrix C′ during normal operation. Further, the color coordinates (x _r ', y _r ', Y _r '), (x _g ', y _g ) of the four primary color lights r ₀ ′, g ₀ ′, b ₀ ′, y ₀ ′ emitted by the light source system 110 ',Y _g '), (x _b ',y _b ',Y _b '), (x _y ',y _y ',Y _y ') can be expressed by the following formula 4:

Further, according to the display device 100 using pixel modulation data based on the four primary colors, the tristimulus values X, Y, and Z of the pixel are calculated as shown in Equation 5:

Wherein, the pixel modulation data of each pixel includes a plurality of primary color modulation data, and the plurality of primary color modulation data includes first primary color modulation data, second primary color modulation data, third primary color modulation data, and fourth primary color modulation data, respectively expressed as r ', g', b', and y', specifically, r', g', b', and y'are the gray values of the four primary colors of light to which the modulation data belongs. The color conversion matrix C'based on the four primary colors based on the color gamut range of the original image data is the color conversion matrix required to calculate the corresponding tristimulus values X, Y, and Z according to the pixel modulation data of any pixel, which conforms to the following formula 6 :

It can be seen from Equation 6 that the color conversion matrix C′ based on the four primary colors is determined by the color gamut range of the four primary colors emitted by the light source system 110 to form an image, that is, the color coordinates of the four primary colors emitted by the light source system 110 are determined by In the present invention, the color gamut range to which the original image data belongs is the same as the color gamut range of the image light emitted by the light modulation device 180. No matter what color gamut range the original image data of any pixel belongs to, the tristimulus values X, Y, Z of the pixel remain unchanged, so according to the above formula 1-6, the original image data r _{s of} any pixel based on the three primary colors , G _s , b _s and the pixel modulation data based on the fourth primary color of the display device 100 satisfy the following formula 7:

According to the above description, for a display device, it is necessary to convert the original image data of each frame of the image to be displayed (such as the original image data r _s , g _s , and b _s based on the three primary colors) into pixel modulation data based on the four primary colors. The pixel modulation data of each pixel includes four primary color modulation data r′, g′, b′, y′ for modulating a primary color light emitted from the light source system 110 respectively, and the further light modulation device 180 is based on the four of each pixel The primary color modulation data r′, g′, b′, y′ modulate the corresponding primary color light emitted from the light source system 110 to accurately generate image light of the image to be displayed. It can be seen that the conversion matrix U stored in the control device 190 that converts the received three-primary-based original image data of any pixel into four-primary-pixel-based pixel modulation data can comply with Equation 8:

U=C' ^-1 C (Equation 8).

According to the above formulas 7-8, the control device 190 according to the original image data based on the three primary colors of each pixel in the image to be displayed, the color conversion matrix C corresponding to the three primary colors of the color gamut to which the image to be displayed corresponds, and the color gamut corresponding to the four primary colors to be displayed The color conversion matrix C'of the primary color can calculate the modulation data of each pixel in the image to be displayed. After the original image data r _s , g _s and b _{s are} input to the control device 190, the control device 190 can calculate and obtain the first to fourth primary color modulation data r′, g′ in the pixel modulation data according to the conversion matrix U , B', y'.

Since in Equation 7, the original image data r _s , g _s , and b _s based on the three primary colors of any pixel in the image to be displayed in the frame are known, the primary color modulation data r′, g′ based on the four primary colors of the arbitrary pixel are solved , B', y', because there are only three equations to solve four unknowns, there are infinitely many solutions. In one embodiment, one of the primary color modulation data is randomly assigned, and then the other three primary color modulation data are obtained. Generally, the value range of the four primary color modulation data is [0, 1], and a randomly selected value as a primary color modulation data may make the remaining three primary color modulation data obtained exceed the value range. In another embodiment, a preset condition is added to solve each primary color modulation data in the pixel modulation data. For example, the preset condition is: the sum of the squares of the brightness of the lasers of the three primary colors of the four primary colors emitted by the light source system 110 is the smallest, and min(r' ² +g' ² +b' ² ) is solved to obtain the four primary colors Modulation data r', g', b', y'. Transform formula 5 into:

among them,

That is, the matrices A and B are determined by the color coordinates of the four primary colors emitted by the light source system 110 and the tristimulus values X, Y, and Z of the corresponding pixels. Among them, the color coordinates of the four primary colors are known or available. The three stimulus values X, Y, and Z can be obtained by Equation 2, that is, both the matrix A and the matrix B can be calculated.

Bring Equation 10-11 into Equation 9 to get Equation 12:

among them,

t ₁₁ , t ₁₂ , t ₂₁ , t ₂₂ , t ₃₁ and t ₃₂ can all be calculated according to matrix A and matrix B.

To solve min(r' ² +g' ² +b' ² ), define the function:

Substituting formula 12 into function f(r',g',b'), when the function f(r',g',b') obtains the minimum value, the condition is satisfied

This gives Equation 14:

D[y'] = d (Equation 14),

among them,

d=[t ₁₁ t ₁₂ +t ₂₁ t ₂₂ +t ₃₁ t ₃₂ ].

Since the matrices D and d can be calculated from the elements in the matrix T, the primary color modulation data r′, g′, b′, and y′ in the pixel modulation data can be obtained according to equations 12 and 14.

The control device 190 is further used to calculate the maximum value of the primary color modulation data of the four primary colors in each frame of the image to be displayed according to the calculated four primary color modulation data of the pixel modulation data of each pixel, that is, to calculate the image of each frame to be displayed The maximum value of the brightness of each primary color light in, and the brightness of each primary color light emitted by the light source system 110 is controlled according to the maximum value of the primary color modulation signal of each primary color. The control device 190 is used to determine whether the maximum value of the primary color modulation data of each primary color in each frame of the image to be displayed is greater than 1, if so, the maximum value of the primary color modulation data of the corresponding primary color is set to 1, and the light source system 110 reaches the maximum power.

The light modulation device 180 is used to modulate the four primary colors of light emitted by the light source system 110 in time sequence. The time period in which the light modulation device 180 modulates each frame of the image to be displayed is a modulation period. Each modulation period includes multiple sub-periods. In each sub-period, one of the four primary colors is modulated. Specifically, the multiple sub-periods included in each modulation period include a first sub-period, a second sub-period, a third sub-period, and a fourth sub-period. The light modulation device 180 is used in the first sub-period according to the A primary color modulation data r'modulate the first primary color light, modulate the second primary color light g'according to the second primary color modulation data of each pixel in the second sub-period, and modulate the data according to the third primary color of each pixel in the third sub-period Modulate the third primary color light b', and modulate the fourth primary color light y'according to the fourth primary color modulation data of each pixel in the fourth sub-period; the control device 190 is used to emit any primary color light in the sub-period according to each The maximum value of the primary color modulation data of each primary color controls the power of the light source system 110.

Specifically, the light source system 110 includes a first light emitter 111, a second light emitter 112, a third light emitter 113, and a wavelength conversion device 115. Among them, the first luminous body 111, the second luminous body 112, and the third luminous body 113 are used to emit laser light as the first primary color light, the second primary color light, and the third primary color light, respectively, and the wavelength conversion device 115 is used to Excitation produces fluorescence as the fourth primary color light.

In this embodiment, the first primary light is red laser, the second primary light is green laser, the third primary light is blue laser, the excitation light is third color laser, and the fourth primary light is yellow fluorescence. In other embodiments, the first luminous body 111, the second luminous body 112, and the third luminous body 113 may also be lasers of other colors. Specifically, the first luminous body 111, the second luminous body 112, and the third luminous body 113 include The number of lasers can be selected as required.

Please refer to FIG. 2 to FIG. 3 together. The wavelength conversion device 115 includes a driving unit 115a and a substrate 115b, wherein the substrate 115b is circular, and the driving unit 115a is disposed at the bottom of the substrate 115b for driving the substrate 115b to perform periodic movements. In this embodiment, the substrate 115b is disk-shaped, and the driving unit 115a is used to drive the substrate 115b to rotate periodically. In other embodiments, the substrate 115b is strip-shaped, and the driving unit 115a is used to drive the substrate 115b to reciprocate.

The substrate 115 is provided with a conversion area Y, a reflection area 115c, and a transmission area 115d. Driven by the driving unit 115a, the conversion area Y, the reflection area 115c, and the transmission area 115d are sequentially located on the optical path of the excitation light. In the present embodiment, the conversion region Y, the reflection region 115c, and the transmission region 115d are located on the optical path of the excitation light in time series.

The conversion area Y is used to convert the excitation light into the fourth primary color light and to reflect the fourth primary color light. In this embodiment, the fourth primary color light is yellow fluorescence, so the conversion area Y is provided with a yellow wavelength conversion material, such as phosphor , Quantum dots or phosphorescent materials, is conducive to make full use of the high light efficiency and stability of yellow wavelength conversion materials. The reflection area 115c is used to reflect the third primary color light. In one embodiment, the reflection area 115c is used to diffusely reflect the incident light of the reflection area 115c to alleviate the speckle phenomenon generated by the third primary color light. The transmissive area 115d is used to transmit the first primary color light and the second primary color light emitted by the first luminous body 111 and the second luminous body 112. It can be understood that the transmissive area 115d in one embodiment also impinges on the transmissive area 115d The light is scattered to alleviate the speckle phenomenon caused by the first primary light and the second primary light.

The wavelength conversion device 115 is used to emit red laser light in the first sub-period, green laser light in the second sub-period, blue laser light in the third sub-period, and yellow fluorescent light in the fourth sub-period. Therefore, in the first sub-period and the second sub-period, the transmission region 115d of the wavelength conversion device 115 is located on the optical path of the excitation light, in the third sub-period, the reflection region 115c is located on the optical path of the excitation light, and in the fourth sub-period The conversion area Y is located on the optical path of the excitation light.

The first primary color light to the fourth primary color light emitted by the wavelength conversion device 115 in time sequence are incident on the light modulation device 180 along the same optical path to be modulated to obtain image light of an image to be displayed. Specifically, the first luminous body 111 and the second luminous body 112 are disposed on the side of the substrate 115b adjacent to the driving unit 115a, the third luminous body is disposed on the side of the substrate 115b facing away from the driving unit 115a, the first luminous body 111 and the second The luminous body 112 is incident on the substrate 115b after passing through the first guide element 114. The first guide element 114 may include, but is not limited to, a reverse red transparent green dichroic sheet. The light source system 110 further includes a collection lens group 116 disposed adjacent to the wavelength conversion device 115 for condensing the light incident on the substrate 115b and collimating the light emitted from the substrate 115b. The various primary colors of light emitted by the collection lens group 116 pass through the second guide element 117, the relay lens 118, and the uniform light device 119 in order to exit from the light source system 110. Wherein, the second guide element 117 may include, but is not limited to, a regional diaphragm, a part of the area of the second guide element 117 is used to transmit blue laser light, and other areas of the second guide element 117 are used to reflect light. The uniform light device 119 may be an optical integrator rod or a compound eye lens, and is used to uniformly illuminate the incident light of the uniform light device 119. The various primary colors of light emitted from the light source system 110 pass through the TIR prism 181 and enter the light modulation device 180. The image light emitted from the light modulation device 180 passes through the TIR prism 181 and the lens device 192 and then exits from the display device 100.

The light modulation device 180 is used to modulate the first primary light, the second primary light, and the third primary light in the first sub-period, the second sub-period, and the third sub-period, respectively. In addition, the control device 190 is also used in the first In the sub-period, the second sub-period and the third sub-period, the first control signal, the second control signal and the third control signal for controlling the power of the first luminous body 111, the second luminous body 112 and the third luminous body 113 are issued respectively control signal. Specifically, the control device 190 is used in the first sub-period, second sub-period and third sub-period, respectively according to the first primary color modulation data r′, the second primary color modulation data g′ and the first The maximum value of the three primary color modulation data b', the relationship between the brightness of the primary color light and the power of the corresponding luminous body, the power of the corresponding luminous body is calculated, and the first control signal, the second control signal and the third control signal are sent out. For example, the control device 190 is configured to, in the first sub-period, according to the maximum value of the first primary color modulation data r′ in each frame of the image to be displayed, the relationship between the brightness of the first primary color light and the power of the first illuminant 111, The power of the first luminous body 111 is calculated, and a first control signal is sent to control the power of the first luminous body 111, and the first primary color light whose brightness corresponds to the maximum value of the first primary color modulation data is obtained. The light modulation device 180 modulates the first primary color light according to the first primary color modulation data r′ in the first sub-period, so that different pixels in the display image formed by the red image light can correspond to different brightness of the first primary color light. It can be understood that the control device 190 emits the second control signal and the third control signal in the same way as the first control signal, and the light modulation device 180 modulates the first primary color light, the second primary color light, and the third primary color light in time series.

The light modulation device 180 is also used to modulate the fourth primary color light in the fourth sub-period, and the control device 190 uses the maximum value of the primary color modulation data of the fourth primary color in each frame of the image to be displayed and the fourth primary color light emitted by the wavelength conversion device 115 The relationship between the brightness and the power of the luminous body that emits the excitation light (the third luminous body 113 in this embodiment) calculates the power of the luminous body that emits the excitation light, and emits the The fourth control signal of the power obtains the fourth primary color light whose brightness corresponds to the maximum value of the fourth primary color modulation data. It can be understood that the greater the power of the luminous body emitting excitation light, the higher the brightness of the fourth primary color light. The light modulation device 180 modulates the fourth primary color light, so that different pixels of the display image formed by the yellow image light can have different brightness of the fourth primary color light, thereby enabling each pixel in the display image of each frame to have The brightness of the four primary colors corresponding to the pixel modulation data.

In this embodiment, the control device 190 obtains the rotation position of the wavelength conversion device 115 according to the detection, that is, the section information currently located on the optical path of the excitation light. In different sub-periods, illuminants of corresponding colors are lit, that is, corresponding driving currents are provided for illuminants of corresponding colors, and other illuminants are turned off. For example, in the first sub-period, the control device 190 sends out a first control signal to light the first light-emitting body 111 and control other light-emitting bodies not to emit light. And, the driving current of the third luminous body in the third sub-period and the fourth sub-period may not be equal.

It can be understood that the display device 100 may also be provided with other necessary optical guiding elements, such as a beam splitting element, a light combining element, a reflecting element, a relay system, etc., which will not be repeated here.

In the present invention, three primary colors of laser light are used to modulate the image. Among them, the color gamut displayed by the laser light in the three primary colors can completely cover the color gamut that can be achieved by the solid color excitation light source, and the addition of fluorescence as the primary color light can be more To achieve the required brightness efficiently, the present invention makes full use of the high-efficiency, non-speckle and low-cost characteristics of fluorescence, mixing the fluorescence with the laser to make the output image have a lower speckle contrast, which is beneficial to alleviate the cause of the laser Speckle effect has a good display effect.

4-5, the main difference between the display device 200 and the display device 100 according to the second embodiment of the present invention is that in the light source system 210 of the display device 200, the first luminous body 211, the second luminous body 212 and the second The three luminous bodies 213 are all disposed on the side of the substrate 215b of the wavelength conversion device 215 facing away from the driving unit 215a. Correspondingly, the substrate 215b is provided with a conversion area Y and a reflection area 215c, and the structure of the transmission area and the wavelength conversion device 215 is omitted. The resulting simplification reduces the manufacturing process and production difficulty. The reflection area 215c is used to reflect the first primary color light, the second primary color light and the third primary color light, that is, in the first sub-period, the wavelength conversion device 215 reflects the first primary color light, and in the second sub-period, the wavelength conversion device 215 reflects Second primary light. Further, a first guiding element 214 and a second guiding element 217 are also provided between the first luminous body 211, the second luminous body 212, the third luminous body 213 and the wavelength conversion device 215 to guide the first primary color light, the first The second primary color light and the third primary color light enter the substrate 215b with the same optical path.

Referring to FIG. 6, the display device 300 provided by the third embodiment of the present invention is mainly different from the display device 100 in that the light source system 310 of the display device 300 further includes a fourth luminous body 313a for emitting excitation light. The first primary light, the second primary light, and the third primary light do not pass through the wavelength conversion device 315, but are guided to the light modulation device 380 along the same optical path by being guided by the first guide element 314 and the second guide element 317. Correspondingly, the wavelength conversion device 315 omits the provision of the reflection area and the transmission area. The excitation light emitted by the fourth luminous body 313a is used to generate the fourth primary color light through the conversion area (not shown) of the wavelength conversion device 315. It can be understood that The substrate 315b is used to emit the fourth primary color light and is not used to emit other color light, and it is not necessary to turn off the fourth luminous body 313a at the connection of the two sections for emitting different color light, which is beneficial to avoid the appearance of the multi-segment wavelength conversion device The spoke phenomenon is helpful to improve the system light efficiency. The fourth luminous body 313a may be used to emit blue laser light as excitation light, and the spectral curves of the excitation light and the third primary light may be the same or different. In a modified embodiment, the wavelength conversion device 315 may also be a fixed phosphor sheet.

It should be noted that, within the scope of the spirit or basic characteristics of the present invention, the specific solutions in the various embodiments of the display device described above can be applied to each other. To save space and avoid duplication, they will not be repeated here.

The present invention also provides a control method applied to the display device in the above embodiments. The specific technical solution applied to each display device and the specific technical solution applied to the control method of the display device may be mutually applicable. The control method of the display device specifically includes the following steps:

S101: Convert the original image data based on the three primary colors of each pixel in the image to be displayed in each frame into pixel modulation data based on the four primary colors.

Specifically, the control device is based on the original image data based on the three primary colors of each pixel, the color conversion matrix of the three primary colors corresponding to the color gamut to which the original image data based on the three primary colors of each pixel belongs, and the The color conversion matrix of the four primary colors corresponding to the color gamut to which the original image data belongs is calculated according to Equation 1-14 to the pixel modulation data of each pixel based on the four primary colors. In the process of solving pixel modulation data, three equations are used to solve the four primary color modulation data in the pixel modulation data, and there are infinitely many solutions. The value range of the four primary color modulation data is [0, 1]. A randomly selected value as a primary color modulation data may make the remaining three primary color modulation data obtained exceed the value range. Another solution method is that the control device calculates the pixel modulation data based on the four primary colors of each pixel according to a preset condition. The preset condition is: the sum of the squared brightness of the lasers of the three primary colors of the four primary colors is the smallest, and That is, the sum of squares of the primary color modulation data of lasers of various primary colors is the smallest.

S102: Use the light source system to emit four primary colors of light corresponding to the above four primary colors, where the four primary colors of light include three primary colors of laser light and one primary color of fluorescence.

The control device also counts the maximum value of the primary color modulation data of each primary color in the pixel modulation data of each pixel of each frame of the image to be displayed according to each primary color modulation data of each pixel, and the maximum value of the primary color modulation data of each primary color Control the brightness of the corresponding primary color light emitted by the light source system. The control device is used to determine whether the maximum value of the primary color modulation data of each primary color in each frame of the image to be displayed is greater than 1, and if so, set the maximum brightness value of the corresponding primary light to 1.

The light source system includes: a first luminous body, a second luminous body and a third luminous body for emitting laser light as the first primary color light, the second primary color light and the third primary color light, respectively, and for generating under the excitation of the excitation light Fluorescence is used as the wavelength conversion device of the fourth primary color light. The time period for the light modulation device to modulate each image to be displayed is a modulation period, and each modulation period includes a first sub-period, a second sub-period, a third sub-period, and a fourth sub-period, the first sub-period, the second The sub-period, the third sub-period, and the fourth sub-period are used to modulate the first primary color light, the second primary color light, the third primary color light, and the fourth primary color light, respectively.

In the first sub-period, the second sub-period and the third sub-period, respectively according to the maximum value of the first primary color modulation data, the maximum value of the second primary color modulation data and the maximum value of the third primary color modulation data in the image to be displayed in each frame, The relationship between the brightness of the primary color light and the power of the corresponding luminous body, the power of the corresponding luminous body is calculated and controlled; in the fourth sub-period, according to the maximum value of the fourth primary color modulation data in each frame of the image to be displayed, the wavelength conversion device The relationship between the brightness of the emitted fourth primary color light and the power of the luminous body emitting excitation light is calculated and controlled to control the power of the luminous body emitting excitation light.

S103: According to the pixel modulation data of each pixel in the image to be displayed in each frame, the four primary colors of light emitted by the light source system are modulated by the light modulation device, thereby obtaining the image light of the image to be displayed. Since the pixel modulation data is calculated based on the color conversion matrix of the four primary colors corresponding to the color gamut of the original image data, the color gamut of the image formed by the image light modulated by the light modulation device is the color gamut of the original image data. The color gamut range of the image light emitted by the device is consistent with the color gamut range of the original image data.

In the present invention, three primary colors of laser light are used to modulate the image. Among them, the color gamut displayed by the laser light in the three primary colors can completely cover the color gamut that can be achieved by the solid color excitation light source, and the addition of fluorescence as the primary color light can be more To achieve the required brightness efficiently, the present invention makes full use of the characteristics of high light efficiency, no speckle and low cost of fluorescence, mixing the fluorescence with the laser to make the output image have a lower speckle contrast, which is beneficial to alleviate the output laser Causes speckle effect and has good display effect.

It will be apparent to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, regardless of the point of view, the embodiments should be regarded as exemplary and non-limiting, the scope of the present invention is defined by the appended claims rather than the above description, and is therefore intended to fall within the claims All changes within the meaning and scope of the equivalent requirements are included in the present invention. Any reference signs in the claims should not be considered as limiting the claims involved. In addition, it is clear that the word "include" does not exclude other units or steps, and the singular does not exclude the plural. Multiple devices stated in the device claims can also be implemented by the same device or system through software or hardware. The first and second words are used to indicate names, but do not indicate any particular order.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be Modifications or equivalent replacements are made without departing from the spirit and scope of the technical solutions of the present invention.

Claims (22)

1. A display device is characterized by comprising:

   A control device, configured to convert the original image data based on the three primary colors of each pixel in each image to be displayed into the pixel modulation data based on the four primary colors of each pixel;

   A light source system for emitting four primary colors of light corresponding to the four primary colors, wherein the four primary colors of light include three primary colors of laser light and one primary color of fluorescence; and

   A light modulation device for modulating the four primary colors of light emitted by the light source system according to pixel modulation data based on four primary colors of each pixel in the image to be displayed in each frame to obtain the image of the image to be displayed Image light.
2. The display device according to claim 1, wherein the control device is configured to correspond to the three primary colors according to the original image data of each pixel based on the three primary colors and the color gamut to which the original image data of each pixel belongs And the color conversion matrix corresponding to the four primary colors of the color gamut to which the original image data of each pixel belongs to calculate the pixel modulation data based on the four primary colors of each pixel.
3. The display device according to claim 2, wherein the control device is further configured to calculate pixel modulation data based on four primary colors of each pixel according to a preset condition, the preset condition is: the Among the four primary colors, the square sum of the brightness of the lasers of the three primary colors is the smallest.
4. The display device according to claim 3, wherein the pixel modulation data of each pixel includes four primary color modulation data for modulating the four primary colors of light, respectively, and the control device is further used for statistics Describing each primary color modulation data of each pixel in each frame of the image to be displayed, obtaining the maximum value of the primary color modulation data of each primary color in the image of each frame to be displayed, and controlling according to the maximum value of the primary color modulation data of each primary color The power of each primary color light emitted by the light source system.
5. The display device according to claim 4, wherein the control device is further configured to separately determine whether the maximum value of the primary color modulation data of each primary color in the image to be displayed in each frame is greater than 1, and if so, set The maximum value of the primary color modulation data greater than 1 is 1.
6. The display device according to claim 4, wherein the period during which the light modulation device modulates the image to be displayed per frame is a modulation period, the modulation period includes a plurality of sub-periods, and the light modulation means respectively Modulating one of the four primary colors of light in each sub-period;

   The control device is used to control the power of the light source system according to the maximum value of the primary color modulation data of each primary color in the image to be displayed in each frame in any sub-period.
7. The display device according to claim 6, wherein the light source system comprises:

   The first luminous body, the second luminous body and the third luminous body are used to emit the first primary color light, the second primary color light and the third primary color light, respectively; and

   The wavelength conversion device is used for emitting the fourth primary color light under the excitation of the excitation light.
8. The display device according to claim 7, wherein the first primary light, the second primary light, and the third primary light are red laser, green laser, and blue laser, respectively, and the fourth primary light is yellow fluorescence.
9. The display device according to claim 7, wherein:

   The plurality of sub-periods in the modulation period include a first sub-period, a second sub-period, a third sub-period, and a fourth sub-period;

   The plurality of primary color modulation data of the pixel modulation data of each pixel includes first primary color modulation data, second primary color modulation data, third primary color modulation data, and fourth primary color modulation data;

   The maximum value of the primary color modulation data of the first primary color in the image to be displayed in each frame is the maximum value of the first primary color modulation data, and the maximum value of the primary color modulation data of the second primary color is the maximum value of the second primary color modulation data. The maximum value of the primary color modulation data of the third primary color is the maximum value of the third primary color modulation data, and the maximum value of the primary color modulation data of the fourth primary color is the maximum value of the fourth primary color modulation data;

   The light modulation device is used to modulate the first primary color light according to the first primary color modulation data of each pixel in the first sub-period, and according to the second primary color of each pixel in the second sub-period The primary color modulation data modulates the second primary color light, the third primary color light is modulated according to the third primary color modulation data of each pixel in the third sub-period, and the third primary color light according to each of the fourth sub-period The fourth primary color modulation data of the pixel modulates the fourth primary color light;

   The control device is used for respectively according to the maximum value of the first primary color modulation data in the image to be displayed in each frame in the first sub-period, the second sub-period and the third sub-period, The relationship between the maximum value of the second primary color modulation data and the maximum value of the third primary color modulation data, the brightness of the primary color light and the power of the luminous body corresponding to the power, the power of the corresponding luminous body is calculated, and issued separately for control The first control signal, the second control signal and the third control signal of the power of the first luminous body, the second luminous body and the third luminous body;

   The control device is further configured to, in the fourth sub-period, according to the maximum value of the fourth primary color modulation data in each frame of the image to be displayed, the brightness of the fourth primary color light emitted by the wavelength conversion device, and to emit the The relationship between the power of the luminous body of the excitation light, calculating the power of the luminous body for emitting the excitation light, and issuing a fourth control signal for controlling the power of the luminous body for emitting the excitation light;

   The light source system is configured to emit corresponding primary color light with corresponding power at a corresponding sub-period according to the first control signal to the fourth control signal.
10. The display device according to claim 9, wherein the excitation light is the third primary color light.
11. The display device according to claim 10, wherein the wavelength conversion device comprises:

    A conversion area for converting the third primary color light into the fourth primary color light and reflecting the fourth primary color light; and

    The reflection area is located on the optical path of the third primary color light in time sequence with the conversion area, and is used to reflect the third primary color light;

    The light emitted by the wavelength conversion device is guided to the light modulation device.
12. The display device according to claim 11, wherein the reflection area is further used for reflecting the first primary color light and the second primary color light.
13. The display device according to claim 11 or 12, wherein the reflection area is used to diffusely reflect light incident on the reflection area.
14. The display device according to claim 11, wherein the wavelength conversion device further includes a transmission area for transmitting the first primary light and the second primary light, the transmission area, the conversion area Located on the optical path of the excitation light in time series with the reflection area.
15. The display device according to claim 14, wherein the transmission area is further used for scattering light incident on the transmission area.
16. The display device according to claim 9, wherein the light source system further includes a fourth luminous body for emitting the excitation light.
17. A control method of a display device includes the following steps:

    Convert the original image data based on the three primary colors of each pixel in each image to be displayed into pixel modulation data based on the four primary colors;

    Using a light source system to emit four primary colors of light corresponding to the four primary colors, wherein the four primary colors of light include three primary colors of laser light and one primary color of fluorescence; and

    The light modulation device modulates the four primary colors of light emitted by the light source system according to the pixel modulation data of each pixel in the image to be displayed in each frame to obtain the image light of the image to be displayed.
18. The control method of the display device according to claim 17, wherein the step of converting the original image data based on the three primary colors of each pixel in the image to be displayed in each frame into pixel modulation data based on the four primary colors includes:

    According to the original image data based on the three primary colors of each pixel, the color conversion matrix corresponding to the three primary colors of the color gamut to which the original image data of each pixel belongs, and the color gamut to which the original image data of each pixel belongs to four The color conversion matrix of the primary colors calculates the pixel modulation data of each pixel based on the four primary colors.
19. The method for controlling a display device according to claim 18, further comprising:

    The pixel modulation data based on the four primary colors of each pixel is calculated according to a preset condition, where the preset condition is: the sum of the squared brightness of the laser light of the three primary colors of the four primary colors is the smallest.
20. The control method of the display device according to claim 19, wherein the pixel modulation data of each pixel includes four primary color modulation data for modulating the four primary color lights, respectively, and the light source system emits The steps of the four primary colors of light corresponding to the four primary colors include:

    Counting each primary color modulation data of each pixel in the image to be displayed in each frame to obtain the maximum value of the primary color modulation data of each primary color in the image to be displayed in each frame, and according to each of the images in each frame to be displayed The maximum value of the primary color modulation data of each primary color controls the power of each primary color light emitted by the light source system.
21. The method for controlling a display device according to claim 20, further comprising:

    Determine whether the maximum value of the primary color modulation data of each primary color in the image to be displayed in each frame is greater than 1, and if so, set the maximum value of the primary color modulation data greater than 1 to 1.
22. The method for controlling a display device according to claim 20, wherein

    The light source system includes:

    The first luminous body, the second luminous body and the third luminous body are used to emit the first primary color light, the second primary color light and the third primary color light, respectively; and

    The wavelength conversion device is used to emit the fourth primary color light under the excitation of the excitation light;

    The time period for the light modulation device to modulate the image to be displayed per frame is a debugging period, and the modulation period includes a plurality of sub-periods, and the light modulation device modulates the four primary colors of light in each sub-period A primary color light, the plurality of sub-periods includes a first sub-period, a second sub-period, a third sub-period, and a fourth sub-period; the plurality of primary color modulation data of the pixel modulation data of each pixel includes a first Primary color modulation data, second primary color modulation data, third primary color modulation data, and fourth primary color modulation data; the light modulation device is used to modulate the first primary color modulation data of each pixel in the first sub-period The first primary light, modulating the second primary light according to the second primary color modulation data of each pixel in the second sub-period, and according to the third primary color of each pixel in the third sub-period Modulation data modulates the third primary color light, and modulates the fourth primary color light according to the fourth primary color modulation data of each pixel in the fourth sub-period;

    The statistics of each primary color modulation data of each pixel in the image to be displayed in each frame to obtain a maximum value of primary color modulation data of each primary color in the image to be displayed in each frame, and according to the image to be displayed per frame The step of controlling the maximum value of the primary color modulation data of each primary color in the brightness of each primary color light emitted by the light source system includes:

    In the first sub-period, the second sub-period, and the third sub-period, respectively, according to the maximum value of the primary color modulation data of the first primary color in the image to be displayed in each frame, the second The relationship between the maximum value of the primary color modulation data of the primary color and the maximum value of the primary color modulation data of the third primary color, the brightness of the primary color light and the power of the luminous body corresponding to the power, calculating and controlling the power of the corresponding luminous body;

    In the fourth sub-period, according to the maximum value of the primary color modulation data of the fourth primary color in each frame of the image to be displayed, the brightness of the fourth primary color light emitted by the wavelength conversion device and the emission of the excitation light The relationship between the power of the luminous body, the power of the luminous body emitting the excitation light is calculated and controlled.

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