CN110737162A - Display device and projection system - Google Patents

Display device and projection system Download PDF

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Publication number
CN110737162A
CN110737162A CN201810791547.6A CN201810791547A CN110737162A CN 110737162 A CN110737162 A CN 110737162A CN 201810791547 A CN201810791547 A CN 201810791547A CN 110737162 A CN110737162 A CN 110737162A
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Prior art keywords
light
fluorescence
segment
color gamut
display device
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CN201810791547.6A
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CN110737162B (en
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田梓峰
周萌
李屹
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Shenzhen Appotronics Corp Ltd
Shenzhen Appotronics Technology Co Ltd
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Shenzhen Appotronics Technology Co Ltd
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Priority to PCT/CN2019/076633 priority patent/WO2020015364A1/en
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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
    • 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
    • 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]
    • 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]
    • H04N9/3141—Constructional details thereof
    • H04N9/315—Modulator illumination systems
    • H04N9/3155—Modulator illumination systems for controlling the light source

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Signal Processing (AREA)
  • Optics & Photonics (AREA)
  • Projection Apparatus (AREA)

Abstract

The invention provides display equipment and a projection system, which comprise a control device, a light source and a light modulation device, wherein the control device is used for obtaining a light quantity control signal and correcting image data, the light source is used for emitting th fluorescent light, second fluorescent light, third fluorescent light, fourth fluorescent light and scattered exciting light according to the light quantity control signal, the light modulation device is used for modulating light rays emitted by a color wheel according to the corrected image data and generating image light of an image to be displayed, so that the proportion of the th fluorescent light, the third fluorescent light, the second fluorescent light and the fourth fluorescent light is dynamically adjusted, the color gamut range of the image light is further dynamically adjusted, and the light utilization rate is also improved.

Description

Display device and projection system
Technical Field
The invention relates to the technical field of display, in particular to display equipment and a projection system.
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.
At present, light sources for projection equipment are mainly classified into types of light sources based on red, green and blue LEDs, a second type of light sources based on red, green and blue LDs, and a third type of light sources based on blue LDs for exciting fluorescent powders to generate red, green and blue fluorescent lights, wherein in the type of scheme, the color reduction capability can reach more than 105% of the NTSC standard color gamut, and the main problems are that the electro-optic conversion efficiency of the green LEDs is low and the brightness of the red, green and blue LEDs is also low, in the second scheme, the color gamut range of the pure RGB lasers can reach BT2020, but the pure laser light sources have serious speckles, high cost and low green laser efficiency and poor temperature stability of the red lasers, in the third scheme, the spectrums emitted by the fluorescent powders are wide, the overall color gamut range of the fluorescent powders is small, the color reduction capability of the projection equipment utilizing the scheme can reach 72% of the NTSC standard color gamut, and enhancement processing is performed, yellow light spectrums in green and red lights can be enlarged, but the color gamut of the NTSC color is greatly reduced due to the loss.
Disclosure of Invention
In order to solve the problem that the color gamut range and the light utilization rate of a laser fluorescence scheme in the prior art cannot be obtained at the same time, display devices with adjustable dynamic color gamuts are provided in the scheme, and projection systems are further provided in the invention.
A display device, comprising:
a control device for decoding the original image data to obtain a light quantity control signal and corrected image data;
a light source for emitting, according to the light amount control signal:
th fluorescence and third fluorescence for modulating an th image in the color gamut range, and
the second fluorescence, the fourth fluorescence and the scattered exciting light are used for modulating the image in the second color gamut range;
wherein the second color gamut covers the color gamut and has a part beyond the color gamut, the th fluorescence and the second fluorescence are th color light, the third fluorescence and the fourth fluorescence are second color light, the excitation light is third color light, the th fluorescence and the second fluorescence are metameric fluorescence and/or the third fluorescence and the fourth fluorescence are metameric fluorescence, and
and the light modulation device is used for modulating the light emitted by the light source according to the corrected image data and generating image light of an image to be displayed.
projection system comprising a display device as described above.
In the display device and the projection system provided by the invention, the control device is used for sending out the light quantity control signal and the correction image signal according to original image data, the light source is used for sending out th fluorescent light and third fluorescent light for modulating the th color gamut range image and second fluorescent light and fourth fluorescent light for modulating the second color gamut range image according to the light quantity control signal, and the light modulation device is used for modulating image light according to the correction image signal, so that the proportions of the th fluorescent light, the third fluorescent light, the second fluorescent light and the fourth fluorescent light are dynamically adjusted, the color gamut range of the image light is dynamically adjusted, and the light utilization rate is also improved.
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, it is obvious that the drawings in the following description are embodiments/modes of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a display device according to a preferred embodiment of the present invention.
Fig. 2 is a schematic top view of the color wheel shown in fig. 1.
Fig. 3 is a schematic diagram of narrow-spectrum fluorescence, wide-spectrum fluorescence and a common color gamut range emitted by the color wheel.
FIG. 4 shows excitation and emission spectra of section and a second section.
Fig. 5 is an excitation and emission spectrum of the third section.
Fig. 6 is an excitation and emission spectrum of the fourth section.
Fig. 7 is a schematic top view of color wheels.
Fig. 8 is a schematic top view of another color wheels according to an embodiment.
Fig. 9 is a luminance distribution diagram of each pixel of the high gamut image.
FIG. 10 shows β -sialon Eu2+With LuAG: Ce3+Graph of relative luminous efficiency.
Fig. 11 is a curve of the electro-optical conversion efficiency of a scheme for generating narrow-spectrum green fluorescence by using blue laser excitation and a scheme for generating green laser light source according to the luminous flux of the excitation light source.
Fig. 12 is a schematic block diagram of the principle of dynamically adjusting the color gamut by the control device.
Fig. 13 is a schematic diagram of the excitation light source corresponding to the driving current of the color wheel to emit various light rays.
Fig. 14 is a schematic block diagram of a dynamic adjustment of the color gamut corresponding to the color wheel shown in fig. 7.
Description of the main elements
Figure BDA0001735035120000041
The following detailed description is provided to further illustrate the present 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 some embodiments rather than all embodiments.
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.
The embodiment of the invention provides dynamic color gamut adjustable display devices, wherein the light source of the display device is used for emitting th fluorescence and third fluorescence for modulating images in color gamut range and modulating second fluorescence and fourth fluorescence for modulating images in a second color gamut range, wherein the second color gamut range covers the color gamut range and has a part exceeding the color gamut range, namely, the color gamut range is a low color gamut range, and the second color gamut range is a high color gamut range.
The detailed structure and principle of the display device and the projection system according to the present invention will be described in detail with reference to the accompanying drawings.
Referring to fig. 1, a schematic structural diagram of a display apparatus 100 according to a preferred embodiment of the present invention is shown, the display apparatus 100 includes a light source 101, an optical modulation device 105 and a control device 107, wherein the control device 107 is configured to decode original image data to obtain a light quantity control signal and corrected image data, the light source 101 is configured to emit light source light according to the light quantity control signal, the optical modulation device 105 is configured to modulate the light source light according to the corrected image data and generate image light of an image to be displayed, and the control device 107 is configured to adjust a light ratio for modulating an image in a th color gamut range and an image in a second color gamut range, thereby dynamically adjusting a color gamut range of the image light.
Specifically, the light source 101 includes an excitation light source 110 and a color wheel 130. The excitation light source 110 is configured to emit excitation light; the color wheel 130 is provided with a wavelength conversion material for generating fluorescence under excitation of the excitation light.
the excitation light source 110 includes a laser for emitting excitation light including laser light, the excitation light is a third color light, in the embodiment of the present invention, the third color light is blue light, and the excitation light source 110 is a blue light source, it is understood that the third color light is not limited to a blue light source, and the third color light may also be violet light, red light, green light, etc. in the embodiment, the illuminant in the excitation light source 110 is a blue laser for emitting blue laser light as the excitation light.
The excitation light source 110 may further include a light uniformizing device to uniformize the excitation light and emit the homogenized excitation light to a subsequent device. The light homogenizing device can be a light homogenizing rod or a fly eye lens and the like.
Referring to fig. 2 in conjunction with fig. 1 to , fig. 2 is a schematic top view of the color wheel 130 shown in fig. 1, the excitation light is guided by the light splitting and combining element 125 to enter the color wheel 130.
As shown in fig. 2, the substrate 131 of the color wheel 130 is circular, and the substrate 131 is periodically rotated by the driving unit, so that the edge area of the substrate 131 is always located on the optical path of the excitation light. The surface of the substrate 131 includes an outer ring region 131b and an inner ring region 131 a. The outer ring region 131b and the inner ring region 131a are both annular and disposed around the edge of the substrate 131, and the inner diameter of the outer ring region 131b is greater than the inner diameter of the inner ring region 131 a. In the present embodiment, the outer ring region 131b is provided adjacent to the inner ring region 131 a. In other embodiments, the outer ring region 131b is spaced apart from the inner ring region 131 a.
, the color wheel 130 includes a scattering layer B, a conversion layer and a filter unit, in this embodiment, the scattering layer B and the conversion layer are disposed in the outer ring region 131B, the filter unit is disposed in the inner ring region 131a, the conversion layer includes a th segment R1, a second segment R2, a third segment G1, a fourth segment G2., the scattering layer B and four segments of the conversion layer are disposed along the circumference of the color wheel 130, and the scattering layer B, the th segment R1, the second segment R2, the third segment G1, and the fourth segment G2 are disposed on the light path of the excitation light in a time sequence under the driving of the driving unit.
Specifically, the scattering layer B is provided with a scattering material on the surface of the substrate 131 to scatter the excitation light, thereby performing coherent cancellation processing on the laser light in the excitation light.
A red wavelength conversion material for modulating the image in the gamut is disposed in the th segment R1 so that the th segment R1 is on the optical path of the excitation light, the excitation light illuminates the th segment R1 and produces the th fluorescent light for modulating the red color of the image in the gamut, a red wavelength conversion material for modulating the image in the second gamut is disposed in the second segment R2 so that the second segment R2 illuminates the second segment R2 and produces the second fluorescent light for modulating the red color of the image in the second gamut when on the optical path of the excitation light, a green wavelength conversion material for modulating the image in the th range is disposed in the third segment G1 so that when the third segment G1 is on the optical path of the excitation light, the excitation light illuminates the third segment G1 and produces the third fluorescent light for modulating the green color of the image in the th segment G2, the fourth fluorescent light illuminates the fourth segment G and produces the fourth fluorescent light, the fourth fluorescent light is interpreted as the fourth fluorescent light , the second fluorescent light is interpreted as the second color light, the fourth color gamut is defined by the fourth fluorescent light , the second fluorescent light, the fourth fluorescent light is interpreted as the fourth fluorescent light , the fourth fluorescent light and the fourth fluorescent light is interpreted as the fourth fluorescent light in the fourth color gamut , the fourth color gamut 845, the fourth color gamut is interpreted as the fourth color gamut, the fourth color gamut 845, the fourth color spectrum of the fourth color spectrum, the fourth color spectrum of the fourth.
The second color gamut covers the color gamut and has a portion exceeding the color gamut, so that the second color gamut is a high color gamut, the color gamut is a low color gamut, the narrow spectrum fluorescence covers the high color gamut, the wide spectrum fluorescence covers the low color gamut, so that the th fluorescence and the third fluorescence are wide spectrum fluorescence, the second fluorescence and the fourth fluorescence are narrow spectrum fluorescence, accordingly, the section R1 and the third section G1 are both provided with wide spectrum fluorescent powder, the second section R2 and the fourth section G2 are both provided with narrow spectrum fluorescent powder, is the case, the half-peak width of the wide spectrum fluorescence is greater than or equal to 70nm, the half-peak width of the narrow spectrum fluorescence is less than 70nm, in embodiment, the second fluorescence and the fourth fluorescence are both provided with narrow spectrum fluorescent powder, so that the adjustment of the half-peak width of the wide spectrum fluorescence is greater than or equal to 70nm, the half-peak width of the narrow spectrum fluorescence is greater than or equal to 70nm, and the adjustment of the second fluorescence is equal to the third fluorescence, the narrow spectrum fluorescence, the third fluorescence and the fourth fluorescence are equal to the same color spectrum fluorescence, and the third fluorescence, the fourth fluorescence is equal to the same color spectrum, the same as the third fluorescence, the fourth fluorescence is equal to the same as the same color spectrum, or equal to the same as the third fluorescence, or equal to the same as the third fluorescence, or equal to the same as the third fluorescence, or equal to the third fluorescence.
Referring to fig. 3, fig. 3 is a schematic diagram of the narrow-spectrum fluorescence, the wide-spectrum fluorescence and the general color gamut range emitted by the color wheel 130. The color gamut range of the broad spectrum fluorescence is between the color gamut of the sRGB standard and the color gamut of the NTSC standard, and the color gamut range of the narrow spectrum fluorescence is close to the color gamut of the BT2020 standard. The narrow spectrum fluorescence has a gamut that covers the broad spectrum fluorescence and has a portion that exceeds the broad spectrum fluorescence.
In the embodiments, quantum dots are disposed in the second segment R2 and the fourth segment G2 to convert the wavelength of the excitation light, and in this embodiment, the red wavelength conversion material disposed in the segment R1 is CaAlSiN3:Eu2+The second segment R2 has K as the red wavelength converting material2SiF6:Mn4+。
Referring to fig. 4 in conjunction with fig. 3, fig. 4 shows the excitation and emission spectra of th bin R1 and second bin R2, under the excitation of blue excitation light (445 nm), th bin R1 emits th fluorescence with a broad spectrum (93 nm peak width), and th fluorescence has a color coordinate within the NTSC standard color gamut, and second bin R2 emits second fluorescence with a narrower emission spectrum, a peak wavelength of 630nm and a color coordinate of (0.69, 0.30), which has a color gamut exceeding the DCI-P3 color gamut standard and approaching the BT2020 color gamut standard.
In embodiments, the red wavelength converting material in the second segment R2 is K2TiF6:Mn4+(peak wavelength 630nm, color coordinates (0.69, 0.30)) or K2GeF6:Mn4+(peak wavelength 630nm, color coordinates (0.69, 0.30)) color is close to the BT2020 Red requirement in embodiments, the second segment R2 may be provided with other wavelength converting materials with narrower emission spectra, or the second segment R2 may be provided with K2SiF6:Mn4+、K2TiF6:Mn4+、K2GeF6:Mn4+And multiple mixed materials in quantum dots.
In the embodiment of the present invention, the green wavelength conversion material provided in the third section G1 is LuAG: Ce3+The fourth section G2 is provided with a wavelength converting material of gamma-AlON: Mn2+。
Referring to fig. 5-6 in conjunction with fig. 3 by step , fig. 5 shows the excitation and emission spectra of the third block G1, fig. 6 shows the excitation and emission spectra of the fourth block G2, under the excitation of blue excitation light (445 nm), the third block G1 emits a broad spectrum (110 nm half-width) of third fluorescence with color coordinates within the NTSC standard color gamut, the fourth block G2 emits a narrower emission spectrum (44 nm half-width) of fourth fluorescence with peak wavelength of 515nm-520nm, color coordinates of 515nm fourth fluorescence of (0.19, 0.75) and color coordinates of 520nm fourth fluorescence of (0.22, 0.71), which is in a color gamut exceeding the DCI-P3 color gamut standard and approaching the BT2020 standard.
In embodiments, the fourth section G2 may use other green wavelength converting materials or γ -AlON: Mn with narrower emission spectra2+、β-sialon:Eu2+(half-peak width 49nm, peak wavelength 528nm, color coordinates (0.28, 0.68), green color close to DCI-P3 standard color gamut), Ba2LiSi7AlN12:Eu2+(61 nm of half-peak width, 515nm of peak wavelength (0.24, 0.61) close to DCI-P3 green) and quantum dots ( or more).
Referring to fig. 1-2, in the color wheel 130, light (including scattered excitation light, wavelength-converted broad-spectrum fluorescence and narrow-spectrum fluorescence) emitted from the outer ring region 131b passes through the light splitting and combining element 125 and the light splitting and combining element 126 in sequence and is guided to the inner ring region 131a, light generated from the outer ring region 131b is reflected to the light splitting and combining element 125 through the substrate 131, and light emitted from the light splitting and combining element 126 passes through the inner ring region 131a, passes through the light homogenizing device and the TIR prism, and is incident on the light modulation device 105.
The inner ring region 131a is provided with filter units B ', R1', R2', G1' and G2 'for filtering the excitation light scattered by the scattering layer B, the -th fluorescent light emitted by the -th segment R1, the second fluorescent light emitted by the second segment R2, the third fluorescent light emitted by the third segment G1 and the fourth fluorescent light emitted by the fourth segment G2, respectively, in embodiments, the filter units B', R1', R2', G1 'and G2' are respectively provided with corresponding filters.
In the present embodiment, the -th segment R1 is circumferentially adjacent to the second segment R2, and the third segment G1 is circumferentially adjacent to the fourth segment G2, in the embodiment, the -th segment R1 is circumferentially adjacent to the third segment G1, and the second segment R2 is circumferentially adjacent to the fourth segment G2, in the embodiment, five segments in the outer ring region 131b are arranged in another order, for example, sequentially emit red-blue-green-red-green light, and accordingly, the segments of the filter unit are arranged in the order corresponding to the above five segments.
Please refer to fig. 7, which is a schematic top view structure diagram of the color wheel 230 in embodiments, the color wheel 230 includes a circular substrate 231, and the surface of the substrate 231 includes a -th fan-shaped annular region 231c, a second fan-shaped annular region 231d and a third fan-shaped annular region 231e, which are disposed along the circumferential direction of the substrate 231. in this embodiment, the -th fan-shaped annular region 231c has the same radius as the second fan-shaped annular region 231d and the third fan-shaped annular region 231e, and is disposed adjacently to form a annular region.
In the present embodiment, the second fan-shaped region 231d includes a th region p and a second region q, and the third fan-shaped region 231e includes a third region s and a fourth region t, and further steps, the th region p, the second region q, the third region s, and the fourth region t are all distributed along the circumferential direction of the substrate 231. in the present embodiment, the th region p, the second region q, the third region s, and the fourth region t are disposed adjacent to each other, and in the -th embodiment, the th region p, the second region q, the third region s, and the fourth region t are disposed at intervals.
Further , the scattering layer B is disposed in the second fan-shaped region 231c, and the third section R , the second R , the third G and the fourth G section are disposed in 2 regions of the third area p, the second q, the third s and the fourth t section respectively, in the present embodiment, the corresponding relationship between the third section R , the second R section, the third G section and the fourth G section p, the second q, the third s and the fourth t section is not limited, in the present embodiment, the third section R , the second R section G , the third G section G and the fourth G section p, the second q, the third s and the fourth G section are sequentially disposed in the third area p, the second q, the third s and the fourth G section , that the sections emitting light of the same color are disposed in the same fan-shaped region , the second G section R231 is disposed in the third R section R231, the third G and the fourth G section 231 are disposed in the same color light emitting area used for understanding that the third R231 is disposed in the same fan-shaped region sector 231, the same color light emitting area sector 231, the same color sector sector 231 used in the same color light emitting sector sector 231, the same manner as the third color light emitting sector 231 used for the third color sector 231, the same color sector 231 used for example, the same color sector 231 used for the third sector.
In embodiments, the boundary between the th region p and the second region q is an arbitrary curve, and the boundary between the third region s and the fourth region t is an arbitrary curve, which may be a wave, a straight line, or the like.
The second fan-shaped annular region 231d is provided with a wide spectrum phosphor and a narrow spectrum phosphor, and the following relationship exists between the two phosphors:
Figure BDA0001735035120000101
wherein r isbAnd rnRatio of wide-spectrum phosphor to narrow-spectrum phosphor, R0The ratio of the two phosphors is linear with the distance from the laser spot to the geometric center of the color wheel 230, and the ratio of the two phosphors can be adjusted by adjusting the position of the laser spot, i.e., the position of the color wheel.
is further based on
(xb,yb,Yb)*rb+(xb,yb,Yb)*(1-rb)＝(x,y,Y)，
Wherein (x)b,yb,Yb) Representing the color coordinates and brightness of the broad spectrum phosphor, (x)b,yb,Yb) Representing the color coordinates and brightness of the narrow-spectrum phosphor, and (x, Y) representing the color coordinates and brightness of the mixed primary light. If the ratio of the wide-spectrum fluorescent powder to the narrow-spectrum fluorescent powder changes, the color coordinates of the primary colors obtained after mixing also change correspondingly, and the color gamut can be adapted to a new color gamut. Moreover, since the light saturation of the narrow-spectrum phosphor is significantly greater than that of the wide-spectrum phosphor, the narrow-spectrum phosphor has a lower power density of the excitation light than the wide-spectrum phosphor, and the light-emitting efficiency under the condition of a higher light power density is lower, the driving current of the excitation light source 110 needs to be adjusted, that is, when the spatial light modulates the lightWhen the signal on the device 105 is a narrow spectrum fluorescent signal, the driving current of the excitation light source 110 needs to be adjusted to be small.
The distance between the excitation light spot formed on the surface of the substrate 231 and the geometric center of the substrate 231 is adjustable, and the ratio of the th fluorescence, the second fluorescence, the third fluorescence and the fourth fluorescence in the light source light is adjusted by adjusting the distance between the excitation light spot formed on the surface of the substrate 231 and the geometric center of the substrate 231. the ratio of the light beams used for modulating the th color gamut and the second color gamut image is changed, so that the color coordinates of the primary colors obtained after mixing are changed correspondingly, and a new color gamut can be adapted.
Please refer to fig. 8, which is a schematic diagram illustrating a top view structure of the color wheel 330 in another embodiments, the color wheel 330 is mainly different from the color wheel 230 in that the region p and the second region q, the third region s and the fourth region t are all fan-shaped, i.e., a boundary between the region p and the second region q is an arc, and a boundary between the third region s and the fourth region t is an arc.
It should be noted that, within the scope of the spirit or the basic features of the present invention, each specific solution applied to the color wheel 230 may also be correspondingly applied to the color wheel 330, and for the sake of brevity and avoidance of repetition, the detailed description thereof is omitted here.
In embodiments, the substrate 131 of the color wheel 130 is circular and the scattering layer B, the th segment R1, the second segment R2, the third segment G1, and the fourth segment G2 are radially disposed on the substrate 131. in preferred embodiments, the scattering layer B, the th segment R1, the second segment R2, the third segment G1, and the fourth segment G2 are at different distances from the geometric center of the substrate 131. further , in preferred embodiments, the scattering layer B, the th segment R1, the second segment R2, the third segment G1, and the fourth segment G2 are annular regions with different inner diameters.
The method comprises the steps of adjusting the distance between an excitation light spot formed on the surface of the substrate 131 and the geometric center of the substrate 131 to adjust the ratio of th fluorescence, second fluorescence, third fluorescence and fourth fluorescence in light source light, modulating the light proportion of the th color gamut and the second color gamut image to change, and correspondingly changing the color coordinates of primary colors obtained after mixing, so as to adapt to a new color gamut, and in preferred embodiments, adjusting the distance between the excitation light spot formed on the surface of the substrate 131 and the geometric center of the substrate 131 by adjusting the position of the color wheel 130.
Referring further to FIG. 1 at , in the embodiment of the present invention, the light modulation device 105 is a DMD, an LCOS, an LCD, preferably an LCOS, an LCD.
The control device 107 is electrically connected with the light modulation device 105 and is electrically connected with the excitation light source 110 through the gamma correction circuit 109, in the present embodiment, the control device 107 and the gamma correction circuit 109 are independent, in embodiments, the gamma correction circuit 109 is arranged in the control device 107, the control device 107 is used for decoding original image data to obtain a light quantity control signal and corrected image data, the excitation light source 110 is used for emitting the excitation light according to the light quantity control signal, the light quantity of the excitation light is controlled by the light quantity control signal, in the present embodiment, the light quantity is represented by the light power of the excitation light, and the light modulation device 105 is used for modulating the light emitted by the color wheel 130 according to the corrected image data and generating the image light of the image to be displayed.
, the light quantity control signal is used to control the driving current intensity of the excitation light source corresponding to different sections on the excitation light path, so as to adjust the light power of the excitation light.
The research of researchers finds that the brightness distribution of the pixel points of the current high color gamut picture is shown in fig. 9, the high brightness of the natural picture is mainly distributed in the sRGB standard color gamut, the peak value of the brightness outside the sRGB standard color gamut is very low, and the brightness requirement is lower than that in the sRGB standard color gamut by about orders or more.
Therefore, in the embodiment of the present invention, five segments are fabricated on the outer ring region 131B of the same color wheel 130, and the primary light in the lower color gamut sRGB range ([ R (0.64, 0.33) G (0.30, 0.60) B (0.15, 0.06) ]) is provided by selecting the segment R1 and the third segment G1 with wider fluorescence emission spectra, so as to provide high-brightness pixel points in the color gamut range for the image to be displayed.
Since the brightness requirement of the current high color gamut picture is low, the excitation light power requirement for exciting the second fluorescent light (narrow spectrum red light) and the fourth fluorescent light (narrow spectrum green light) on the color wheel 130 is low, and from the brightness distribution of fig. 9, the brightness requirement of the narrow spectrum fluorescent light is 1/10 of the wide spectrum fluorescent light. Although narrow-spectrum fluorescence has a lower power density to withstand excitation light than broad-spectrum fluorescence due to its longer afterglow time, the luminous efficiency is lower under the condition of higher optical power density; however, by adjusting the optical power of the narrow-spectrum fluorescence, the efficiency of the narrow-spectrum fluorescence can still be kept high, and the optical power of the excitation light source 110 is saved, which is beneficial to reducing the power consumption of the display device 100 and improving the light utilization rate.
the section R1, the second section R2, the third section G1, the fourth section G2 are located on the light path of the excitation light, the light power of the excitation light is the optical power of the second section, the optical power of the third section, the optical power of the fourth section, wherein the light quantity control signal is used to control the optical power of the second section to be less than or equal to the optical power of the the section, and the optical power of the fourth section to be less than or equal to the optical power of the third section, in embodiment, the light quantity control signal is used to control the optical power of the second section to be less than or equal to 1/10 of the optical power of the red fluorescence region, and/or to control the optical power of the fourth section to be less than or equal to 1/10 of the optical power of the third section.
FIG. 10 shows β -sialon Eu2+With LuAG: Ce3+Graph of relative luminous efficiency. LuAG: Ce3+For emitting broad-spectrum green fluorescenceThe half-peak width of the third fluorescence is 110nm, β -sialon Eu2+For emitting a narrow spectrum green fluorescence, the half-width of the fourth fluorescence emitted therefrom was 50 nm.
As shown in FIG. 10, at a relative optical power density of 1, β -sialon: Eu2+Luminescence efficiency of (1) and LuAG: Ce3+Approximately, β -sialon Eu at a relative optical power density of 102+The efficiency of (B) is LuAG to Ce3+About 80% of the total amount of Eu, thus the Eu is in the narrow-spectrum green powder β -sialon2+The excitation light power density is wide-spectrum green powder LuAG: Ce 3+1/10, β -sialon: Eu2+Can also maintain higher efficiency with LuAG: Ce3+And (4) approaching. The excitation light source 110 correspondingly drives different sections on the optical path of the excitation light according to the light quantity control signal, so as to generate primary color light with different proportions to realize dynamic color gamut adjustment, maintain higher light conversion efficiency and improve light utilization rate.
, compared to the second RGB laser scheme mentioned in the background art, specifically, the current electro-optical conversion efficiency of green laser excited fluorescence is 12%, the electro-optical conversion efficiency of blue laser is 38%, and the conversion efficiency of blue laser used to generate narrow-spectrum green fluorescence is 40-60%, so the electro-optical conversion efficiency of blue laser used to generate narrow-spectrum green fluorescence is 15-23%, and the efficiency of blue laser excited to generate narrow-spectrum green fluorescence is higher than that of the current green laser scheme.
Referring to fig. 11, fig. 11 is a graph showing the variation of the photoelectric conversion efficiency of the scheme for generating the narrow-spectrum green fluorescence by using blue laser excitation and the scheme for generating the green laser source with the luminous flux of the excitation light source 110, wherein when the luminous flux of the excitation light source 110 is below 6000lm, the photoelectric conversion efficiency of the scheme for generating the narrow-spectrum green fluorescence by using blue laser excitation is higher than that of the scheme for generating the green laser source. As the luminous flux of the excitation light source 110 gradually increases, the electro-optic conversion efficiency of both schemes tends to decrease, wherein the electro-optic conversion efficiency of the scheme for generating the narrow-spectrum green fluorescence by using blue laser excitation is more attenuated than that of the green laser light source scheme.
Please refer to fig. 12, which is a schematic block diagram illustrating the color gamut dynamic adjustment performed by the control device 107. The control means 107 is configured to derive a gamut range based on which the original image data of the image to be displayed is derived from the original image data to derive the light amount control signal.
Specifically, the control device 107 can convert the raw image data (e.g., r, g, b) of each pixel of the image to be displayed into CIE xyY chromaticity value data by using a correlation formula, wherein the CIE xyY chromaticity value data of each pixel includes color coordinates x, Y and a luminance value Y, the control device 107 obtains the color coordinates (e.g., color coordinates x, Y) of each pixel of the image to be displayed according to the CIE xyY chromaticity value data of each pixel, and further obtains a range defined by the color coordinates of each pixel of the image to be displayed, i.e., a color gamut range of the image to be displayed, further , the control device 107 also obtains the luminance value Y of each pixel of the image to be displayed according to the CIE xyY chromaticity value data of each pixel, so that the control device 107 can generate the light quantity control signal according to the color coordinates x, Y and the luminance value Y of each pixel of the image to be displayed to control the luminance of the excitation light emitted from the excitation light source 110 so as to control the light power thereof.
Referring to fig. 13, a schematic diagram of driving currents of the excitation light source 110 corresponding to various light rays emitted by the color wheel 130, the light quantity control signal controls the driving current intensity of the excitation light source 110 corresponding to different sections on the light path of the excitation light, so as to control the excitation light source 110 to emit the excitation light with corresponding light power, so as to adjust the ratio of the wide-spectrum fluorescence to the narrow-spectrum fluorescence, and obtain color coordinates adapted to the color gamut range on which the image to be displayed is based.
Specifically, as shown in fig. 1, the light quantity control signal is provided to the gamma correction circuit 109, and the gamma correction circuit 109 sends out a corresponding driving signal to a driving circuit in the excitation light source 110 according to the light quantity control signal, and the driving circuit dynamically controls the excitation light power sent out by the excitation light source 110 according to the driving signal.
Please refer to fig. 14, which is a schematic block diagram illustrating a principle of dynamically adjusting a color gamut by the control device 107 corresponding to the color wheel shown in fig. 7, the main difference between the present embodiment and the foregoing embodiment is that in the present embodiment, the control device 107 calculates a ratio between a narrow-spectrum fluorescence and a wide-spectrum fluorescence, and a light quantity control signal output by the control device 107 controls a driving current of the excitation light source 110 and a position of the color wheel 230 at the same time, so that the control device 107 dynamically adjusts an irradiation position of an excitation light spot on the color wheel 230, thereby adjusting a ratio of light rays emitted by the light source 101 for modulating the th color gamut and the second color gamut, and further implementing color gamut adjustment of an image to be displayed corresponding to a primary color coordinate.
Please refer to fig. 12 in step , the control device 107 is configured to calculate a current color gamut according to the light quantity control signal, convert the original image data of the image to be displayed into the image data of the current color gamut through a corresponding formula by using the current color gamut and the color gamut based on the original image data, and use the image data of the current color gamut as the corrected image data, and the light modulation device 105 further modulates the light emitted from the color wheel 130 according to the corrected image data to accurately restore the pixels of the image to be displayed.
The control device 107 determines the current color gamut according to the color gamut range based on which the image to be displayed is based, wherein the current color gamut range is a triangular region which covers the color gamut range based on which the image to be displayed is based, that is, which covers the color coordinates of each pixel of the image to be displayed, specifically, the current color gamut range may be a color gamut region which just covers the color coordinates of each pixel of the image to be displayed and has the smallest area.
The control device 107 transmits the corrected image signal to the light modulation device 105. taking the corrected image signal in the RGB encoding format as an example, the original image data is an RGB signal, wherein the R signal in the original image data is used for modulating red light, the G signal is used for modulating green light, and the B signal is used for modulating blue light, the corrected image signal is an RRGGB signal, which is equivalent to the R signal and the G signal being repeated in time sequence, that is, the light modulation device 105 actually processes fluorescence emitted from the segment R1 and the second fluorescence emitted from the second segment R2, or the third fluorescence emitted from the third segment G1 and the fourth fluorescence emitted from the fourth segment G2, respectively, in the time period when both the R signal and the G signal are R or both are G signal.
Specifically, assuming that the R signal value is a (0. ltoreq. a. ltoreq.255), the light modulation device 105 receives the th fluorescence light and the corrected image signal corresponding to the second fluorescence time period is aa.
After the two time periods are mixed in time sequence, the actually emergent red light brightness value is a/255.YR'(YR' when a is 225, the luminance of red light emitted from the light modulation device 105); the color coordinates of the actually emitted red primary color light are (x, y).
Assuming that the th fluorescence has a brightness of a/255. YR1(YR1The intensity of the th fluorescent light emitted from the light modulation device 105 when all the th fluorescent light passes through the light modulation device 105, that is, the intensity of the th fluorescent light emitted from the light modulation device 105 when a is 225, and the color coordinate of the th fluorescent light is (x)R1，yR1)。
Assuming that the brightness of the second fluorescence is a/255. YR2(YR2The color coordinate of the second fluorescent light is (x) when the light modulation device 105 emits the second fluorescent light at all the luminances of the second fluorescent light emitted from the light modulation device 105, that is, when a is 225R2，yR2) Then, the light modulation device 105 emits the brightness Y of the red primary color lightR' and color coordinates (x, y) satisfy:
YR'＝YR1+YR2
Figure BDA0001735035120000161
Figure BDA0001735035120000162
the red primary color light is obtained by mixing the th fluorescence (wide spectrum fluorescence) and the second fluorescence (narrow spectrum fluorescence), if the proportion of the two lights changes, the red primary color light obtained after mixing also changes correspondingly, the brightness of the th fluorescence and the brightness of the second fluorescence are determined by the driving current of the corresponding excitation light source 110, therefore, the driving current corresponding to the th section R1 and the second section R2 is changed through the light quantity control signal, the brightness corresponding to the two sections can be changed, and the color coordinate and the brightness of the finally obtained red primary color are changed.
In the display device 100 and the projection system provided by the invention, the control device 107 is used for sending out a light quantity control signal and a correction image signal according to original image data, the light source 101 is used for sending out th fluorescent light and third fluorescent light for modulating the th color gamut range image and second fluorescent light and fourth fluorescent light for modulating the second color gamut range image according to the light quantity control signal, and the light modulation device 105 is used for modulating the image light according to the correction image signal, so that the ratio of the wide-spectrum fluorescent light and the narrow-spectrum fluorescent light in the image light is dynamically adjusted, the color gamut range of the image light is dynamically adjusted, and the light utilization rate is also improved.
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 scope of the invention is thus to be construed as illustrative and not restrictive, and the appended claims are not to be construed as limited to the foregoing description, and therefore all changes that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein by the appended claims.
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 (17)

  1. A display device of , comprising:
    a control device for decoding the original image data to obtain a light quantity control signal and corrected image data;
    a light source for emitting, according to the light amount control signal:
    th fluorescence and third fluorescence for modulating an th image in the color gamut range, and
    the second fluorescence, the fourth fluorescence and the scattered exciting light are used for modulating the image in the second color gamut range;
    wherein the second color gamut covers the color gamut and has a part beyond the color gamut, the th fluorescence and the second fluorescence are th color light, the third fluorescence and the fourth fluorescence are second color light, the excitation light is third color light, the th fluorescence and the second fluorescence are metameric fluorescence and/or the third fluorescence and the fourth fluorescence are metameric fluorescence, and
    and the light modulation device is used for modulating the light emitted by the light source according to the corrected image data and generating image light of an image to be displayed.
  2. 2. The display device of claim 1, wherein the light source comprises:
    an excitation light source for emitting the excitation light; and
    a color wheel for receiving the excitation light, comprising:
    a substrate;
    the scattering layer is arranged on the surface of the substrate and used for scattering the exciting light to obtain scattered exciting light; and
    a conversion layer disposed on the substrate surface and including a segment, a second segment, a third segment and a fourth segment, wherein the segment, the second segment, the third segment and the fourth segment are provided with wavelength conversion materials and are respectively used for converting the excitation light into th fluorescence light, second fluorescence light, third fluorescence light and fourth fluorescence light;
    the light quantity control signal is used for controlling the driving current intensity of the excitation light source corresponding to different sections on the excitation light optical path, so that the optical power of the excitation light is adjusted.
  3. 3. The display device as claimed in claim 2, wherein when the th segment, the second segment, the third segment and the fourth segment are respectively located on the light path of the excitation light, the optical power of the excitation light is respectively th optical power, second optical power, third optical power and fourth optical power;
    wherein the light quantity control signal is used for controlling the second optical power to be less than or equal to the th optical power and/or controlling the fourth optical power to be less than or equal to the third optical power.
  4. 4. The display device according to claim 3, wherein the light amount control signal is used to control 1/10 of the second optical power equal to or less than the th optical power, and to control 1/10 of the fourth optical power equal to or less than the third optical power.
  5. 5. The display device according to claim 2, wherein the wavelength conversion material provided in the th section is CaAlSiN3:Eu2+。
  6. 6. The display device of claim 2, wherein the wavelength converting material disposed in the third section is LuAG Ce3+。
  7. 7. The display device according to claim 2, wherein the wavelength converting material provided in the second section is K2SiF6:Mn4+、K2TiF6:Mn4+、K2GeF6:Mn4+And kinds of quantum dots or their combination.
  8. 8. The display device according to claim 2, wherein the wavelength converting material provided in the fourth section is γ -AlON: Mn2+、β-sialon:Eu2+、Ba2LiSi7AlN12:Eu2+And kinds of quantum dots or their combination.
  9. 9. The display device of claim 2, wherein the substrate is circular, and the scattering layer, the th segment, the second segment, the third segment, and the fourth segment are disposed circumferentially on the substrate.
  10. 10. The display device of claim 2, wherein a distance between the excitation light spot formed on the substrate surface and a geometric center of the substrate is adjustable, and a ratio of th, second, third, and fourth fluorescence in the light source light is adjusted by adjusting the distance between the excitation light spot formed on the substrate surface and the geometric center of the substrate.
  11. 11. The display device of claim 10, wherein the substrate is circular, the substrate surface comprises th, second, and third fan-shaped annular regions disposed along a circumference of the substrate, the second fan-shaped annular region comprises th and second regions, the third fan-shaped environmental region comprises third and fourth regions, the th and third regions are disposed proximate a geometric center of the substrate, the second and fourth regions are disposed proximate an edge of the substrate;
    wherein the scattering layer is disposed in the th fan-shaped region, the th, second, third and fourth segments being disposed in of the th, second, third and fourth regions, respectively.
  12. 12. The display device according to claim 11, wherein the th section, the second section, the third section, and the fourth section are sequentially disposed in the th region, the second region, the third region, and the fourth region.
  13. 13. The display device of claim 10, wherein the substrate is circular, and the scattering layer, the th segment, the second segment, the third segment, and the fourth segment are radially disposed on the substrate.
  14. 14. The display device of claim 1, wherein the light modulating device is an LCOS or an LCD.
  15. 15. The display device of any of wherein,
    the control device is used for obtaining a color gamut range based on original image data according to the original image data of the image to be displayed so as to obtain the light quantity control signal.
  16. 16. The display device of claim 14,
    the control device is used for calculating a current color gamut range according to the light quantity control signal, converting original image data of an image to be displayed into image data of the current color gamut range by using the current color gamut range and the color gamut range based on the original image data, and taking the image data of the current color gamut range as the correction image data.
  17. A projection system of 17, , comprising a display device as claimed in any of claims 1-16 through .
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