CN111381420A - Display apparatus and control method thereof - Google Patents
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- CN111381420A CN111381420A CN201811615815.5A CN201811615815A CN111381420A CN 111381420 A CN111381420 A CN 111381420A CN 201811615815 A CN201811615815 A CN 201811615815A CN 111381420 A CN111381420 A CN 111381420A
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2006—Lamp housings characterised by the light source
- G03B21/2033—LED or laser light sources
- G03B21/204—LED or laser light sources using secondary light emission, e.g. luminescence or fluorescence
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
Abstract
The present invention provides a display apparatus and a control method thereof, the display apparatus including: the control device is used 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; the light source system is used for emitting four primary colors corresponding to the four primary colors, wherein the four primary colors comprise laser of three primary colors and fluorescence of one primary color; and the light modulation device is used for modulating the four primary colors of light emitted by the light source system according to the pixel modulation data based on the four primary colors of each pixel in each frame of image to be displayed, so as to obtain the image light of the image to be displayed. The invention utilizes the lasers of three primary colors to modulate images, wherein the color gamut displayed by the lasers in the three primary colors can completely cover the color gamut which can be achieved by a pure-color excitation light source, and the speckle contrast is reduced while the fluorescence is added as the primary color light, so that the required brightness can be achieved more efficiently.
Description
Technical Field
The invention relates to the technical field of display, in particular to a display device and a control method thereof.
Background
This section is intended to provide a background or context to the specific embodiments of the invention that are recited in the claims. The description herein is not admitted to be prior art by inclusion in this section.
Light sources of laser projection equipment are divided into two main categories, one is to excite fluorescent powder with different colors by short-wavelength laser to generate primary color light of three primary colors of red, green and blue. Another type directly utilizes red, green and blue lasers as the three primary color light sources.
For the scheme of exciting the fluorescent powder by laser, because the semiconductor blue laser device 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 using the blue semiconductor laser device has the characteristics of long service life, high efficiency, stable system and low cost. However, the phosphor powder produces a wider spectrum of fluorescence, which results in a narrower color gamut of the solution. As shown in fig. 1, a projection device using this technology can basically cover the sRGB color gamut, and the color gamut can be enhanced to 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 and red light. But the narrow-band filtering loses considerable luminance, so that the efficiency of the system is greatly reduced.
On the other hand, in a projection system directly using three-color lasers of red, green and blue as three-primary-color light sources, the RGB lasers have very good monochromaticity and thus have a very wide color gamut range. Projection systems using RGB lasers can easily meet the color gamut standard of REC 2020. Projection systems for RGB lasers also have a number of disadvantages. The first drawback is speckle. Speckle is caused by the coherence of laser light, and the light reflected on a projection plane interferes due to a phase difference caused by the fluctuation of the plane, resulting in uneven brightness distribution of a projection picture. Although there have been many inventions that attempt to solve the problem of laser speckle, none are ideal. A second disadvantage is the high cost of the RGB system. This is because the red and green lasers in RGB are not mature under current technology. The efficiency of semiconductor green laser can only reach 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. These two points cause the RGB laser system to have color cast with temperature. This requires the addition of a thermostat to the red laser to stabilize the operating state of the red laser. In high brightness projection devices, this also means that powerful cooling means are required to ensure that the operating temperature of the red laser is stable, thereby greatly increasing the cost of the RGB laser projection system.
Disclosure of Invention
An aspect of the present invention provides a display apparatus including:
the control device is used 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;
the light source system is used for emitting four primary colors corresponding to the four primary colors, wherein the four primary colors comprise laser of three primary colors and fluorescence of one primary color; and
and the light modulation device is used for modulating the four primary colors of light emitted by the light source system according to the pixel modulation data based on the four primary colors of each pixel in each frame of 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 method of controlling a display apparatus, including:
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;
emitting four primary colors corresponding to the four primary colors by using a light source system, wherein the four primary colors comprise laser of three primary colors and fluorescence of one primary color; and
the light modulation device modulates the four primary colors of light emitted by the light source system according to the pixel modulation data based on the four primary colors of each pixel in each frame of image to be displayed, so as to obtain the image light of the image to be displayed.
The invention utilizes the lasers of three primary colors to modulate images, wherein the color gamut displayed by the lasers in the three primary colors can completely cover the color gamut which can be achieved by a pure-color excitation light source, and the fluorescence can more efficiently achieve the required brightness by adding the fluorescence as the primary colors.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments/modes of the present invention, the drawings needed to be used in the description of the embodiments/modes are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments/modes of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
Fig. 1 is a comparison graph of laser fluorescence color gamut and standard color gamut.
Fig. 2 is a schematic structural diagram of a display device provided in a first embodiment of the present invention.
Fig. 3 is a schematic top view of the wavelength conversion device shown in fig. 2.
Fig. 4 is a schematic structural diagram of a display device provided in a second embodiment of the present invention.
Fig. 5 is a schematic top view of the wavelength conversion device shown in fig. 4.
Fig. 6 is a schematic structural diagram of a display device provided in a third embodiment of the present invention.
Description of the main elements
The following detailed description will further illustrate the invention in conjunction with the above-described figures.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a detailed description of the present invention will be given below with reference to the accompanying drawings and specific embodiments. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth to provide a thorough understanding of the present invention, and the described embodiments are merely a subset of the embodiments of the present invention, rather than a complete embodiment. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Referring to fig. 2, a display apparatus 100 according to a first embodiment of the present invention includes a light source system 110, a light modulation device 180, and a control device 190. The light source system 110 is configured to emit four primary lights, wherein the four primary lights include three primary lights and one primary light; the control device 190 is configured to convert 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, where the four primary colors based on the pixel modulation data correspond to color coordinates of four primary colors emitted by the light source system 110; the light modulation device 180 is configured to modulate the four primary color lights emitted by the light source system 110 according to the pixel modulation data of each pixel in each frame of the image to be displayed, so as to obtain image light of the image to be displayed.
In this embodiment, the four primary color lights emitted by the light source system 110 may be RGB laser lights and yellow fluorescent lights, that is, the four primary color lights are red laser lights, green laser lights, blue laser lights and yellow fluorescent lights. In one embodiment, the four primary color lights are a magenta laser, a cyan laser, a blue laser, and a yellow fluorescence, but it is understood that the four primary color lights may be a combination of a laser and a fluorescence of other colors, and the invention is not limited thereto.
The control device 190 is configured to read raw image data based on three primary colors for each pixel in each frame of image to be displayed in the image source, and further, in the present embodiment, the raw image data for each pixel in each frame of image to be displayed is in RGB encoding format, but it is understood that in the modified embodiment, the raw image data for each pixel in the image to be displayed is not limited to RGB encoding format, and may also be in YUV, XYZ encoding format, and the like. Further, the original image data of each pixel of each frame of the image to be displayed includes original image data based on three primary colors, such as red original image data rsGreen original image data gsAnd blue original image data bs. In one embodiment, rs、gs、bsCan be characterized by gray-scale values, e.g. raw image data r of three primary colors of one pixels、gs、bsMay be gray scale values of 100, 120, 150, respectively.
Further, the three-primary-color-based original image data of each pixel of the image to be displayed per frame includes a color gamut range to which it belongs, and the color gamut range information to which the original image data of each pixel of the image to be displayed per frame belongs is known or can be known. Specifically, in an embodiment, in addition to the three-primary-color original image data of each pixel, the original image data of each pixel of the frame of image to be displayed may further include color gamut range information to which the original image data belongs, and after the control device 190 receives the original image data of each pixel of any one frame of image to be displayed, the color gamut range to which the original image data of each pixel of the frame of image to be displayed belongs may be known according to the color gamut range information. The color coordinates of primary colors in different color gamuts are different, for example, the RGB three primary colors specified by 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) respectively in the xyz coordinate.
Wherein, the original image data of each pixel in each frame image to be displayed belongs toTricolor light r with color gamut range under xyz coordinate system0、g0、b0Color coordinate (x)r,yr,Yr)、(xg,yg,Yg)、 (xb,yg,Yg) Can be expressed using the following equation 1:
it is understood that the xyz coordinate system can be defined in the CIE 1937 standard, and that CIE 1937 defines the absolute colors and intensities of colors that any human eye can distinguish in a three-dimensional vector, which does not vary with the color gamut. As described above, the 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 gamut range to which the original image data of each pixel of each frame of the image to be displayed belongs is the three primary colors r in the xyz coordinate0、 g0、b0Color coordinate (x)r,yr,Yr)、(xg,yg,Yg)、(xb,yb,Yb) Are known or may be known.
Further, according to the original image data r of each pixel in the frame image to be displayeds、 gs、bsThe calculated tristimulus values X, Y, Z of the pixel are shown in equation 2:
the color conversion matrix C of the three primary colors corresponding to the color gamut of the image to be displayed corresponds to the color gamut range of the original image data, and is a color conversion matrix required by calculating corresponding tristimulus values X, Y, Z according to the original image data of any pixel and the color gamut range information to which the original image data belongs, and the color conversion matrix C conforms to the following formula 3:
as shown in equation 3, the color conversion matrix C is the color gamut mapping of the original image data of any pixel to the three primary colors r0、g0、b0Color coordinates (x) ranging in xyz coordinatesr,yr,Yr)、 (xg,yg,Yg)、(xb,yb,Yb) And (6) determining. Specifically, in an embodiment, the color gamut range information to which the original image data of the frame of image to be displayed belongs may include a color conversion matrix C, that is, in addition to the original image data based on three primary colors, the original image data of the frame of image to be displayed may store the color conversion matrix C based on three primary colors as the color gamut range information to which the original image data of the frame of image to be displayed belongs, but in a modified embodiment, the range information to which the color gamut to which the original image data of the frame of image to be displayed belongs may also be three primary colors r0、g0、b0Color coordinate (x)r,yr,Yr)、(xg,yg,Yg)、(xb,yb,Yb) The information or the specific character or code representing the gamut range information, etc. is not limited to the above.
Further, according to the above formulas 1, 2 and 3, the original image data r of three primary colors according to any pixel can be knowns、gs、bsAnd color gamut range information to which the three primary colors of any pixel belongs、gs、bsColor gamut range information, i.e. tricolor light r0、g0、b0Color coordinate (x)r,yr,Yr)、(xg,yg,Yg)、(xb,yb,Yb) The tristimulus values X, Y and Z of any pixel can be calculated and obtained.
For the display device 100, a color conversion matrix C 'based on four primary colors is stored, wherein the color conversion matrix C' based on four primary colors is related to color coordinates of the four primary colors emitted from the light source system 110 in an xyz coordinate system.
The four primary colors r provided by the light source system 110 to the light modulation device 1800'、g0'、b0'、 y0' the color coordinates are respectively (x)r',yr',Yr')、(xg',yg',Yg')、(xb',yb',Yb')、(xy',yy', Yy'). It is understood that, for the display device 100, when the primary light emitted by the light source system 110 is fixed, the color gamut range to which the image obtained by using the pixel modulation data in each frame of the image to be displayed belongs is also known, that is, the color gamut range that can be displayed by the primary light emitted by the light source system 110. Four primary colors of light r0'、g0'、b0'、y0' color coordinate (x)r',yr',Yr')、(xg',yg',Yg')、 (xb',yb',Yb')、(xy',yy',Yy') may be obtained by measuring the gamut range of the primary light emitted by the light source system 110.
The control device 190 is configured to calculate modulation data r ', g ', b ', y ' based on four primary colors for each pixel according to the original image data based on three primary colors for each pixel, the color conversion matrix C of three primary colors corresponding to the color gamut to which the original image data based on three primary colors for each pixel belongs, and the color conversion matrix C ' of four primary colors corresponding to the color gamut to which the original image data based on three primary colors for each pixel belongs. In the case that the light source system 110 emits the primary light fixedly, the color conversion matrix C ' of the display device 10 based on four primary colors is also fixedly, for example, the color conversion matrix C ' may be stored in advance in the manufacturing process of the display device 10, so that the display device 10 may generate the pixel modulation data using the color conversion matrix C ' during normal operation. Further, the four primary colors r emitted from the light source system 1100'、g0'、b0'、y0' color coordinate (x)r',yr', Yr')、(xg',yg',Yg')、(xb',yb',Yb')、(xy',yy',Yy') can be expressed using the following equation 4:
further, calculating tristimulus values X, Y, Z of the pixels using pixel modulation data based on four primary colors according to the display apparatus 100 is as shown in equation 5:
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, which are respectively expressed as r ', g', b ', and y', and specifically, r ', g', b ', and y' are gray values of four primary colors of a color gamut range to which the modulation data belongs. The color conversion matrix C' based on four primaries based on the gamut range to which the original image data belongs is a color conversion matrix required to calculate the corresponding tristimulus values X, Y, Z according to the pixel modulation data of any one pixel, and it conforms to the following equation 6:
as can be seen from equation 6, the color conversion matrix C' based on four primary colors is determined by the color gamut range of the four primary colors emitted from the light source system 110 to form the image, i.e. by the color coordinates of the four primary colors emitted from the light source system 110, and in the present invention, the color gamut range of the original image data is the same as the color gamut range of the image light emitted from the light modulation device 180. Since the tristimulus values X, Y, Z of the pixels remain unchanged regardless of the gamut range to which the original image data of any one pixel belongs, the original image data r based on three primary colors of any one pixel is obtained according to the above equations 1 to 6s、gs、bsThe relationship with the fourth primary color based pixel modulation data of the display device 100 satisfies the following equation 7:
as can be seen from the above description, for a display device, the original image data (e.g. the original image data r based on three primary colors) of each frame of the image to be displayed needs to be displayeds、gs、bs) The image data is converted into pixel modulation data based on four primary colors, the pixel modulation data of each pixel includes four primary color modulation data r ', g', b ', y' respectively used for modulating one primary color light emitted by the light source system 110, and further the light modulation device 180 modulates the corresponding primary color light emitted by the light source system 110 according to the four primary color modulation data r ', g', b ', y' of each pixel, so as to accurately generate the image light of the image to be displayed. It can be seen that the conversion matrix U stored in the control device 190 for converting the received original image data based on three primary colors of any one pixel into the pixel modulation data based on four primary colors may conform to equation 8:
U＝C'-1c (equation 8).
According to the above formulas 7-8, the control device 190 can calculate the modulation data of each pixel in the image to be displayed according to the original image data based on 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 of the image to be displayed, and the color conversion matrix C' corresponding to the four primary colors of the color gamut of the image to be displayed. Original image data rs、gs、 bsAfter the input to the control device 190, the control device 190 can calculate and obtain the first primary color modulation data to the fourth primary color modulation data r ', g', b ', y' in the pixel modulation data according to the conversion matrix U.
Since in equation 7, it is known that the original image data r based on three primary colors of any pixel in the frame image to be displayeds、gs、bsAnd solving the four-primary-color-based primary color modulation data r ', g', b 'and y' of any pixel has infinite solutions because only three equations solve four unknowns. In one embodiment, one of the primary color modulation data is randomly assigned, and the other three primary color modulation data are evaluated. Generally, the value range of the four primary color modulation data is [0, 1]]Randomly selectedOne value as one primary color modulation data may cause the remaining three primary color modulation data to be solved out of value. In another embodiment, each primary color modulation data in the pixel modulation data is solved by adding a preset condition. For example, the preset conditions are: the sum of squared luminance of the laser light of three primary colors of the four primary color lights emitted from the light source system 110 is minimum, and min (r 'is solved'2+g'2+b'2) Thereby obtaining four primary color modulation data r ', g', b ', y'. Transform equation 5 to:
wherein the content of the first and second substances,
that is, the matrices a and B are determined by the color coordinates of the four primary colors emitted from the light source system 110 and the tristimulus values X, Y, Z of the corresponding pixels, where the color coordinates of the four primary colors are known or can be known, and the tristimulus values X, Y, Z of the corresponding pixels can be obtained by formula 2, that is, the matrices a and B can be obtained by calculation.
Substituting equations 10-11 into equation 9 results in equation 12:
wherein the content of the first and second substances,
t11、t12、t21、t22、t31、t32can be calculated according to the matrix A and the matrix B.
To seekDecoct (r'2+g'2+b'2) Defining the function:
substituting equation 12 into function f (r ', g', b '), and satisfying the condition when function f (r', g ', b') takes the minimum value
Thus, equation 14 is obtained:
d [ y' ] ═ D (formula 14),
wherein the content of the first and second substances,
d＝[t11t12+t21t22+t31t32]。
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 the formulas 12 and 14.
The control device 190 is further configured to calculate a maximum value of the primary color modulation data of the four primary colors in each frame of the image to be displayed, that is, calculate a maximum value of the brightness of each primary color in each frame of the image to be displayed, according to the calculated four primary color modulation data in the pixel modulation data of each pixel, and control the brightness of each primary color emitted by the light source system 110 according to the maximum value of the primary color modulation signal of each primary color. The control device 190 is configured to determine whether a maximum value of 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 value of primary color modulation data of the corresponding primary color to 1, where the light source system 110 reaches the maximum power.
The light modulation device 180 is configured to modulate the four primary lights emitted by the light source system 110 in time sequence, a time period during which each frame of an image to be displayed is modulated by the light modulation device 180 is a modulation period, each modulation period includes a plurality of sub-periods, and the light modulation device 180 modulates one primary light of the four primary lights in each sub-period. Specifically, the plurality of 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 configured to modulate the first primary light according to the first primary modulation data r 'of each pixel in the first sub-period, modulate the second primary light g' according to the second primary modulation data of each pixel in the second sub-period, modulate the third primary light b 'according to the third primary modulation data of each pixel in the third sub-period, and modulate the fourth primary light y' according to the fourth primary modulation data of each pixel in the fourth sub-period; (ii) a The control device 190 is used for controlling the power of the light source system 110 according to the maximum value of the primary color modulation data of each primary color in the sub-period of emitting any primary color light.
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. The first light emitter 111, the second light emitter 112, and the third light emitter 113 are respectively configured to emit laser light as a first primary color light, a second primary color light, and a third primary color light, and the wavelength conversion device 115 is configured to generate fluorescence light as a fourth primary color light under excitation of the excitation light.
In this embodiment, the first primary color light is a red laser light, the second primary color light is a green laser light, the third primary color light is a blue laser light, the excitation light is a third color laser light, and the fourth primary color light is a yellow fluorescence. In other embodiments, the first light emitter 111, the second light emitter 112, and the third light emitter 113 may also be lasers with other colors, and the number of the lasers included in the first light emitter 111, the second light emitter 112, and the third light emitter 113 may be selected according to needs.
Referring to fig. 2-3, the wavelength conversion device 115 includes a driving unit 115a and a substrate 115b, wherein the substrate 115b is circular, the driving unit 115a is disposed at the bottom of the substrate 115b for driving the substrate 115b to move periodically, in this embodiment, the substrate 115b is disc-shaped, the driving unit 115a is for driving the substrate 115b to rotate periodically, in other embodiments, the substrate 115b is bar-shaped, and the driving unit 115a is for driving the substrate 115b to move back and forth.
The substrate 115 is provided with a conversion region Y, a reflection region 115c and a transmission region 115d, and the conversion region Y, the reflection region 115c and the transmission region 115d are sequentially located on the light path of the excitation light under the driving of the driving unit 115 a. 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 region Y is used for converting the excitation light into the fourth primary color light and for reflecting the fourth primary color light, and in this embodiment, the fourth primary color light is yellow fluorescent light, so that the conversion region Y is provided with a yellow wavelength conversion material, such as fluorescent powder, quantum dots, or a phosphorescent material, which is beneficial to fully utilizing the high light efficiency and stability of the yellow wavelength conversion material. The reflective region 115c is used for reflecting the third primary color light, and in one embodiment, the reflective region 115c is used for performing diffuse reflection on incident light of the reflective region 115c to alleviate the speckle phenomenon generated by the third primary color light. The transmissive region 115d is used for transmitting the first primary light and the second primary light emitted by the first light emitter 111 and the second light emitter 112, and it can be understood that the transmissive region 115d further scatters incident light of the transmissive region 115d in an embodiment to alleviate a speckle phenomenon generated by the first primary light and the second primary light.
The wavelength conversion device 115 is used for emitting red laser light in a first sub-period, emitting green laser light in a second sub-period, emitting blue laser light in a third sub-period, and emitting yellow fluorescence in a fourth sub-period. Therefore, in the first sub-period and the second sub-period, the transmissive region 115d of the wavelength conversion device 115 is located on the optical path of the excitation light, in the third sub-period, the reflective region 115c is located on the optical path of the excitation light, and in the fourth sub-period, the conversion region 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 to the light modulation device 180 along the same light path to be modulated to obtain image light of an image to be displayed. Specifically, the first light emitter 111 and the second light emitter 112 are disposed on one side of the substrate 115b adjacent to the driving unit 115a, the third light emitter is disposed on one side of the substrate 115b away from the driving unit 115a, and the first light emitter 111 and the second light emitter 112 pass through the first guiding element 114 and then are incident on the substrate 115 b. The first guide element 114 may include, but is not limited to, a red-reflective, green-transmissive dichroic plate. The light source system 110 further includes a collection lens group 116 disposed adjacent to the wavelength conversion device 115 to condense light incident on the substrate 115b and collimate light exiting the substrate 115 b. The various primary colors emitted from the collecting lens group 116 pass through the second guiding element 117, the relay lens 118 and the dodging device 119 in sequence and then are emitted from the light source system 110. The second guiding element 117 may include, but is not limited to, a regional film, a part of the region of the second guiding element 117 is used for transmitting the blue laser, and the other region of the second guiding element 117 is used for reflecting the light. The light homogenizing device 119 may be an optical integrating rod or a fly-eye lens for homogenizing incident light of the light homogenizing device 119. Various primary color lights emitted from the light source system 110 pass through the TIR prism 181 and enter the light modulation device 180, and image lights emitted from the light modulation device 180 pass through the TIR prism 181 and the lens device 192 and then exit the display apparatus 100.
The light modulation device 180 is configured 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, and the control device 190 is further configured to emit a first control signal, a second control signal, and a third control signal for controlling the power of the first light emitter 111, the second light emitter 112, and the third light emitter 113 in the first sub-period, the second sub-period, and the third sub-period, respectively. Specifically, the control device 190 is configured to calculate, in the first sub-period, the second sub-period, and the third sub-period, the power of the corresponding light emitter according to the relationship between the brightness of the primary light and the power of the corresponding light emitter according to the maximum value of the first primary color modulation data r ', the second primary color modulation data g ', and the third primary color modulation data b ' in each frame of the image to be displayed, and send the first control signal, the second control signal, and the third control signal. For example, the control device 190 is configured to calculate, in the first sub-period, the power of the first light emitter 111 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 light emitter 111, and send the first control signal to control the power of the first light emitter 111, so as to obtain the first primary color light with the brightness corresponding to the maximum value of the first primary color modulation data. 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 may correspond to different luminances of the first primary color light. It is 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 time-sequentially modulates the first primary light, the second primary light and the third primary light.
The light modulation device 180 is further configured to modulate the fourth primary color light in the fourth sub-period, and the control device 190 calculates the power of the illuminant emitting the excitation light according to the relationship between 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 115, and the power of the illuminant emitting the excitation light (in this embodiment, the third illuminant 113), and emits a fourth control signal for controlling the power of the illuminant emitting the excitation light, so as to obtain the fourth primary color light with the brightness corresponding to the maximum value of the fourth primary color modulation data. It is understood that the higher the power of the light-emitting body that emits the excitation light, the higher the luminance 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 of the yellow image light can have different luminances of the fourth primary color light, whereby each pixel in each frame of the display image can be made to have four primary color luminances corresponding to the pixel modulation data.
In the present embodiment, the control device 190 obtains the rotational position of the wavelength conversion device 115, i.e., obtains the section information currently located on the excitation light optical path, based on the detection. And in different sub-periods, the luminous bodies with the corresponding colors are lightened, namely, the luminous bodies with the corresponding colors are provided with corresponding driving currents, and other luminous bodies are turned off. For example, in the first sub-period, the control device 190 sends the first control signal to light the first light emitter 111 and controls the other light emitters not to emit light. And, the driving currents of the third light emitting body in the third sub-period and the fourth sub-period may not be equal.
It is understood that other necessary optical guiding elements, such as a light splitting element, a light combining element, a reflecting element, a relay system, etc., may be disposed in the display device 100, and are not described herein.
The invention utilizes the lasers of three primary colors to modulate images, wherein the color gamut displayed by the lasers in the three primary colors can completely cover the color gamut which can be achieved by a pure-color excitation light source, and the fluorescence can more efficiently achieve the required brightness by adding the fluorescence as the primary colors.
Referring to fig. 4-5, a main difference between the display device 200 according to the second embodiment of the present invention and the display device 100 is that in the light source system 210 of the display device 200, the first light emitter 211, the second light emitter 212, and the third light emitter 213 are all disposed on a side of the substrate 215b of the wavelength conversion device 215 away from the driving unit 215a, and accordingly, the substrate 215b is disposed with the conversion region Y and the reflection region 215c, and the transmission region is omitted, so that the structure of the wavelength conversion device 215 is simplified, and the manufacturing process and the manufacturing difficulty are reduced. The reflective region 215c is used for reflecting the first primary light, the second primary light and the third primary light, i.e. in the first sub-period, the wavelength conversion device 215 reflects the first primary light, and in the second sub-period, the wavelength conversion device 215 reflects the second primary light. Further, a first guiding element 214 and a second guiding element 217 are further disposed between the first light emitter 211, the second light emitter 212, the third light emitter 213 and the wavelength conversion device 215 to guide the first primary light, the second primary light and the third primary light to enter the substrate 215b through the same optical path.
Referring to fig. 6, a display apparatus 300 according to a third embodiment of the present invention is different from the display apparatus 100 in that the light source system 310 of the display apparatus 300 further includes a fourth light emitter 313a for emitting excitation light, and the first primary light, the second primary light, and the third primary light do not pass through the wavelength conversion device 315, but enter the light modulation device 380 along the same light path through the first guiding element 314 and the second guiding element 317. Correspondingly, the wavelength conversion device 315 omits a reflection region and a transmission region, and the excitation light emitted by the fourth light emitter 313a is used for generating fourth primary color light through a conversion region (not shown) of the wavelength conversion device 315, it can be understood that the substrate 315b is used for emitting the fourth primary color light and is not used for emitting other color light, and the fourth light emitter 313a does not need to be closed at a connection of two sections for emitting different color light, which is beneficial to avoiding a spoke phenomenon of the multi-section wavelength conversion device, and is beneficial to improving the system light efficiency. The fourth light emitters 313a may be configured 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 patch.
It should be noted that, within the scope of the spirit or the basic features of the present invention, the embodiments of the display device described above can be applied to each other, and for the sake of brevity and avoidance of repetition, detailed description is omitted here.
The present invention also provides a control method applied to the display device in the above embodiment, and the specific technical solutions applied to the respective display devices and the specific technical solutions in the control method of the display device may be mutually applicable. The control method of the display device specifically comprises the following steps:
s101: and converting the 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.
Specifically, the control device calculates the four-primary-color-based pixel modulation data of each pixel according to formulas 1 to 14 according to the three-primary-color-based original image data of each pixel, the three-primary-color conversion matrix corresponding to the color gamut to which the three-primary-color-based original image data of each pixel belongs, and the four-primary-color conversion matrix corresponding to the color gamut to which the three-primary-color-based original image data of each pixel belongs. In the process of solving the pixel modulation data, four primary color modulation data in the pixel modulation data are solved by using three equations, and infinite solutions exist. The value ranges of the four primary color modulation data are [0, 1], and the randomly selected value as one primary color modulation data can make the solved other three primary color modulation data exceed the value ranges. The other solving method is that the control device calculates and obtains pixel modulation data based on four primary colors of each pixel according to preset conditions, wherein the preset conditions are as follows: the sum of squares of the luminances of the laser lights of three primary colors among the four primary colors is the minimum, that is, the sum of squares of the primary color modulation data of the laser lights of the respective primary colors is the minimum.
S102: and emitting four primary colors corresponding to the four primary colors by using a light source system, wherein the four primary colors comprise laser of three primary colors and fluorescence of one primary color.
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 image to be displayed according to each primary color modulation data of each pixel, and controls the brightness of the primary color light of the corresponding color emitted by the light source system according to the maximum value of the primary color modulation data of each primary color. The control device is used for judging whether the maximum value of the primary color modulation data of each primary color in each frame of image to be displayed is larger than 1, if so, the maximum value of the brightness of the corresponding primary color light is set to be 1.
The light source system includes: the wavelength conversion device is used for generating fluorescence under the excitation of exciting light to serve as a fourth primary color light. The light modulation device is used for modulating a time period of each frame of image to be displayed as a modulation period, each modulation period comprises a first sub-period, a second sub-period, a third sub-period and a fourth sub-period, and the first sub-period, the second sub-period, the third sub-period and the fourth sub-period are respectively used for modulating first primary light, second primary light, third primary light and fourth primary light.
In the first sub-period, the second sub-period and the third sub-period, calculating and controlling the power of the corresponding luminous body according to the relationship among 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 each frame of image to be displayed, the brightness of the primary color light and the power of the corresponding luminous body; and in the fourth sub-period, calculating and controlling the power of the luminous body emitting the exciting light according to the relationship among the maximum value of the fourth primary color modulation data in each frame of image to be displayed, the brightness of the fourth primary color light emitted by the wavelength conversion device and the power of the luminous body emitting the exciting light.
S103: and modulating the four primary color lights emitted by the light source system by using the light modulation device according to the pixel modulation data of each pixel in each frame of image to be displayed, thereby obtaining the image light of the image to be displayed. The pixel modulation data is obtained by calculation based on a color conversion matrix of four primary colors corresponding to the color gamut to which the original image data belongs, the color gamut to which the image formed by the image light modulated by the light modulation device belongs is the color gamut to which the original image data belongs, and the color gamut range to which the image light emitted by the light modulation device belongs is consistent with the color gamut range to which the original image data belongs.
The invention utilizes the lasers of three primary colors to modulate images, wherein the color gamut displayed by the lasers in the three primary colors can completely cover the color gamut which can be achieved by a pure-color excitation light source, and the fluorescence can more efficiently achieve the required brightness by adding the fluorescence as the primary colors.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned. Furthermore, it is obvious that the word "comprising" does not exclude other elements or steps, and the singular does not exclude the plural. Several of the means recited in the apparatus claims may also be embodied by one and the same means or system in software or hardware. The terms first, second, etc. are used to denote names, but not any particular order.
Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (22)
1. A display device, comprising:
the control device is used 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;
the light source system is used for emitting four primary colors corresponding to the four primary colors, wherein the four primary colors comprise laser of three primary colors and fluorescence of one primary color; and
and the light modulation device is used for modulating the four primary colors of light emitted by the light source system according to the pixel modulation data based on four primary colors of each pixel in each frame of image to be displayed, so as to obtain the image light of the image to be displayed.
2. The display device according to claim 1, wherein the control means is configured to calculate the four-primary-color-based pixel modulation data for each pixel according to the three-primary-color-based raw image data for each pixel, the color conversion matrix corresponding to the three primary colors and the color conversion matrix corresponding to the four primary colors.
3. The display device according to claim 2, wherein the control means is further configured to calculate the four primary color-based pixel modulation data for each pixel according to preset conditions, the preset conditions being: the sum of the squares of the luminances of the lasers of the three primary colors of the four primary color lights is the smallest.
4. The display device according to claim 3, wherein the pixel modulation data of each pixel comprises four primary color modulation data for modulating the four primary colors, respectively, and the control device is further configured to count the primary color modulation data of each pixel in each frame of the image to be displayed, obtain a maximum value of the primary color modulation data of each primary color in each frame of the image to be displayed, and control the power of each primary color emitted by the light source system according to the maximum value of the primary color modulation data of each primary color.
5. The display device according to claim 4, wherein the control device is further configured to separately determine whether a 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 value of the primary color modulation data greater than 1 to 1.
6. The display device according to claim 4, wherein the period in 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 device modulates one of the four primary lights in each sub-period, respectively;
the control device is used for controlling the power of the light source system according to the maximum value of the primary color modulation data of each primary color in each frame of image to be displayed in any sub-period.
7. The display device of claim 6, wherein the light source system comprises:
the first light-emitting body, the second light-emitting body and the third light-emitting body are respectively used for emitting first primary color light, second primary color light and third primary color light; and
and the wavelength conversion device is used for emitting fourth primary color light under the excitation of the exciting light.
8. The display device according to claim 7, wherein the first primary color light, the second primary color light, and the third primary color light are red laser light, green laser light, and blue laser light, respectively, and the fourth primary color light is yellow fluorescent light.
9. The display device of claim 7,
a plurality of sub-periods in the modulation period comprise 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 comprise 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 each frame of image to be displayed is the maximum value of the first primary color modulation data, 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 for modulating the first primary light according to the first primary color modulation data of each pixel in the first sub-period, modulating the second primary light according to the second primary color modulation data of each pixel in the second sub-period, modulating the third primary light according to the third primary color modulation data of each pixel in the third sub-period, and modulating the fourth primary light according to the fourth primary color modulation data of each pixel in the fourth sub-period;
the control device is configured to calculate, in the first sub-period, the second sub-period, and the third sub-period, power of a corresponding illuminant according to a relationship between the maximum value of the first primary color modulation data, the maximum value of the second primary color modulation data, the maximum value of the third primary color modulation data in each frame of the image to be displayed, and luminance and power of a primary color light corresponding to the power of the illuminant, and send a first control signal, a second control signal, and a third control signal for controlling the power of the first illuminant, the power of the second illuminant, and the power of the third illuminant, respectively;
the control device is further configured to calculate, in the fourth sub-period, according to a relationship between the maximum value of the fourth primary color modulation data in each frame of image to be displayed, the luminance of the fourth primary color light emitted by the wavelength conversion device, and the power of the light emitter emitting the excitation light, to obtain the power of the light emitter emitting the excitation light, and to emit a fourth control signal for controlling the power of the light emitter emitting the excitation light;
the light source system is used for emitting corresponding primary light with corresponding power in corresponding sub-periods 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 of claim 10, wherein the wavelength conversion device comprises:
a conversion region for converting the third primary color light into the fourth primary color light and reflecting the fourth primary color light; and
the reflecting area and the conversion area are sequentially positioned on the light path of the third primary color light and are used for reflecting the third primary color light;
the light emitted from the wavelength conversion device is guided to the light modulation device.
12. The display device of claim 11, wherein the reflective region is further configured to reflect the first primary light and the second primary light.
13. The display device according to claim 11 or 12, wherein the reflective region is for diffusely reflecting light incident on the reflective region.
14. The display device according to claim 11, wherein the wavelength conversion device further includes a transmission region for transmitting the first primary color light and the second primary color light, and the transmission region, the conversion region, and the reflection region are sequentially located on an optical path of the excitation light.
15. The display device of claim 14, wherein the transmissive region is further configured to scatter light incident on the transmissive region.
16. The display device according to claim 9, wherein the light source system further comprises a fourth light emitter for emitting the excitation light.
17. A control method of a display device, comprising the steps of:
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;
emitting four primary colors corresponding to the four primary colors by using a light source system, wherein the four primary colors comprise laser of three primary colors and fluorescence of one primary color; and
and the light modulation device modulates the four primary colors of light emitted by the light source system according to the pixel modulation data based on the four primary colors of each pixel in each frame of image to be displayed, so as to obtain the image light of the image to be displayed.
18. The method for controlling a display device according to claim 17, wherein the step of converting the original image data based on three primary colors of each pixel in each frame of the image to be displayed into the pixel modulation data based on four primary colors comprises:
and calculating to obtain the four-primary-color-based pixel modulation data of each pixel according to the three-primary-color-based original image data of each pixel, the color conversion matrix of the three primary colors corresponding to the color gamut to which the original image data of each pixel belongs, and the color conversion matrix of the four primary colors corresponding to the color gamut to which the original image data of each pixel belongs.
19. The control method of a display device according to claim 18, further comprising:
calculating to obtain the pixel modulation data of each pixel based on the four primary colors according to preset conditions, wherein the preset conditions are as follows: the sum of the squares of the luminances of the lasers of the three primary colors of the four primary color lights is the smallest.
20. The control method of a 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 colors, respectively, and the step of emitting the four primary colors corresponding to the four primary colors with the light source system includes:
and counting each primary color modulation data of each pixel in each frame of image to be displayed to obtain the maximum value of the primary color modulation data of each primary color in each frame of image to be displayed, and controlling the power of each primary color light emitted by the light source system according to the maximum value of the primary color modulation data of each primary color in each frame of image to be displayed.
21. The control method of a display device according to claim 20, further comprising:
respectively judging whether the maximum value of the primary color modulation data of each primary color in each frame of image to be displayed is greater than 1, if so, setting the maximum value of the primary color modulation data greater than 1 to be 1.
22. The control method of a display device according to claim 20,
the light source system includes:
the first light-emitting body, the second light-emitting body and the third light-emitting body are respectively used for emitting first primary color light, second primary color light and third primary color light; and
the wavelength conversion device is used for emitting fourth primary color light under the excitation of exciting light;
the light modulation device is used for modulating the time period of each frame of image to be displayed to be a debugging time period, the modulation time period comprises a plurality of sub-periods, the light modulation device modulates one of the four types of primary light in each sub-period, and the plurality of sub-periods comprise 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 comprise 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 for modulating the first primary light according to the first primary color modulation data of each pixel in the first sub-period, modulating the second primary light according to the second primary color modulation data of each pixel in the second sub-period, modulating the third primary light according to the third primary color modulation data of each pixel in the third sub-period, and modulating the fourth primary light according to the fourth primary color modulation data of each pixel in the fourth sub-period;
the step of counting each primary color modulation data of each pixel in each frame of image to be displayed to obtain a maximum value of the primary color modulation data of each primary color in each frame of image to be displayed, and controlling the brightness of each primary color light emitted by the light source system according to the maximum value of the primary color modulation data of each primary color in each frame of image to be displayed comprises the following steps:
in the first sub-period, the second sub-period and the third sub-period, calculating and controlling the power of the corresponding luminous body according to the relationship among the maximum value of the primary color modulation data of the first primary color, the maximum value of the primary color modulation data of the second primary color and the maximum value of the primary color modulation data of the third primary color in each frame of image to be displayed, and the brightness and the power of the primary color light corresponding to the power of the luminous body;
and in the fourth sub-period, calculating and controlling the power of the luminous body emitting the exciting light according to the relationship among the maximum value of the primary color modulation data of the fourth primary color in each frame of image to be displayed, the brightness of the fourth primary color light emitted by the wavelength conversion device and the power of the luminous body emitting the exciting light.
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| US11448954B2 (en) * | 2020-03-20 | 2022-09-20 | Coretronic Corporation | Illumination system and projection device |
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| US11448954B2 (en) * | 2020-03-20 | 2022-09-20 | Coretronic Corporation | Illumination system and projection device |
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| WO2020135292A1 (en) | 2020-07-02 |
| CN111381420B (en) | 2022-04-22 |
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