CN113113527B - Light emitting module and display device using the same - Google Patents
Light emitting module and display device using the same Download PDFInfo
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- CN113113527B CN113113527B CN202110397632.6A CN202110397632A CN113113527B CN 113113527 B CN113113527 B CN 113113527B CN 202110397632 A CN202110397632 A CN 202110397632A CN 113113527 B CN113113527 B CN 113113527B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/50—Wavelength conversion elements
- H01L33/501—Wavelength conversion elements characterised by the materials, e.g. binder
- H01L33/502—Wavelength conversion materials
- H01L33/504—Elements with two or more wavelength conversion materials
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133609—Direct backlight including means for improving the color mixing, e.g. white
Abstract
The invention provides a light emitting module and a display device using the same, wherein the light emitting module comprises a light emitting unit, a first phosphor and a second phosphor. The absorption band of the second phosphor is substantially in a wavelength range of 400 to 600 nanometers, an absorbance peak of the second phosphor occurs at an absorbance peak wavelength, the absorbance peak wavelength falls in a wavelength range of 560 to 600 nanometers, and the absorbance of the second phosphor for light having a wavelength longer than the absorbance peak wavelength by 30 nanometers or more is less than 50% of the absorbance peak.
Description
Technical Field
The present invention relates to a light emitting module and a display device using the same, and more particularly, to a light emitting device and a display device having improved energy efficiency.
Background
The improvement of white light emitting technology can benefit the lighting requirement of general life and also benefit electronic products such as display device. For example, by improving the energy efficiency and the color gamut area of the white light backlight of the liquid crystal display, better display quality and reduced power consumption can be obtained. As for LEDs (light emitting diodes), there are two main means for generating white light, one is to generate white light by mixing light emitted from blue, green and red LEDs, and the other is to use a combination of blue LEDs and green, yellow and/or red phosphors, which absorb blue light with higher frequency and higher energy and emit green, yellow and/or red light, and then white light can be obtained by mixing light emitted from blue and phosphor.
Existing white LEDs using phosphors are for example those using phosphors such as SCASN or KSF to produce red light. Referring to fig. 1A, the dashed line shown in fig. 1A may represent an absorption spectrum of the SCASN, and the solid line may represent an emission spectrum of the SCASN. Referring to fig. 1B, the dashed line shown in fig. 1B may represent the absorption spectrum of KSF, and the solid line may represent the luminescence spectrum of KSF. As shown in fig. 1A and 1B, the highest values of the absorption spectra of the SCASN and the KSF occur at wavelengths less than 500 nm, and the absorption rates of both are rapidly reduced at wavelengths greater than 450 nm, in other words, the absorption spectra of the SCASN and the KSF mainly only cover the wavelength range below 500 nm.
The color filters used in a typical display device may include blue filters, green filters, and red filters. In the wavelength range where the pass band of the green filter spectrum and the pass band of the red filter spectrum meet, a relatively high ratio in the white light backlight of the display device is filtered out by the filters, and thus energy is wasted.
As described above, the conventional SCASN absorption spectrum and KSF absorption spectrum for generating white light mainly cover only the wavelength range below 500 nm, and cannot effectively utilize the energy in the wavelength range where the passband of the green filter spectrum and the passband of the red filter spectrum meet, so that the efficiency of the conventional white light emitting device for the energy of the light filtered by the filters is improved.
Disclosure of Invention
The invention aims to provide a light-emitting module and a display device which can achieve a wide color gamut and simultaneously achieve energy efficiency.
To achieve the above object, in one embodiment of the present invention, a light emitting module may include a light emitting unit, a first phosphor, and a second phosphor. The absorption band of the second phosphor is substantially in a wavelength range of 400 nm to 600nm, an absorbance peak of the second phosphor occurs at an absorbance peak wavelength, the absorbance peak wavelength falls in a wavelength range of 560nm to 600nm, and an absorbance of the second phosphor for light having a wavelength longer than the absorbance peak wavelength by 30 nm or more is less than 50% of the absorbance peak.
In the present embodiment, the absorption peak wavelength of the second phosphor falls within the wavelength range of 560nm to 600nm, so that the energy that is wasted due to the filtering of the color filter can be absorbed and utilized, and the energy efficiency is improved. In addition, since the absorptivity of the second phosphor for light having a wavelength longer than the absorption peak wavelength by more than 30 nm is less than 50% of the absorption peak, the second phosphor can be not affected by the self-absorption phenomenon so much that it does not undergo a significant decrease in luminous efficiency and a red shift (red shift) of the spectrum.
In order to achieve the above object, in another embodiment of the present invention, a display device may include a backlight module, a light modulation panel, and a filter, wherein the backlight module may include a light emitting unit, a first phosphor, and a second phosphor. The absorption band of the second phosphor is substantially in a wavelength range of 400 to 600 nanometers, an absorbance peak of the second phosphor occurs at an absorbance peak wavelength, the absorbance peak wavelength falls in a wavelength range of 560 to 600 nanometers, and the absorbance of the second phosphor for light having a wavelength longer than the absorbance peak wavelength by 30 nanometers or more is less than 50% of the absorbance peak.
In this embodiment, since the display device uses the backlight module including the second phosphor, the area of the color gamut thereof may exceed the area of the NTSC color gamut.
Drawings
FIG. 1A shows the absorption spectrum and the emission spectrum of a conventional phosphor;
FIG. 1B shows the absorption spectrum and the emission spectrum of another prior art phosphor;
FIG. 2 shows the absorption spectrum and the emission spectrum of a red phosphor according to an embodiment of the present invention;
FIG. 3A shows a light emission spectrum of a light emitting module and a light emission spectrum of a conventional light emitting module according to an embodiment of the invention;
fig. 3B shows a light emission spectrum of a light emitting module according to an embodiment of the invention;
FIG. 4 shows the CIE1931 color space in an XY chromaticity diagram;
FIG. 5 shows a display device, NTSC standard, and a prior art color gamut of an embodiment of the present invention in an XY chromaticity diagram;
FIG. 6A is a schematic diagram of a light emitting module according to an embodiment of the invention;
FIG. 6B is a schematic diagram of a light emitting module according to an embodiment of the invention;
FIG. 7A is a schematic diagram of a light emitting module according to an embodiment of the invention;
FIG. 7B is a schematic diagram of a light emitting module according to an embodiment of the invention;
FIG. 8A is a schematic diagram of a light emitting diode according to an embodiment of the present invention;
FIG. 8B is a schematic diagram of a color conversion layer according to an embodiment of the present invention;
fig. 9 is a schematic diagram of a display device according to an embodiment of the invention.
Reference numerals illustrate:
P_AB: absorption peak
P_em: luminescence peak
W_AB: absorption peak wavelength
W_em: peak wavelength of luminescence
P_G: green light emission peak
W_g: green luminescence peak wavelength
CG1-CG3: color gamut
B1-B3: blue primary color point
G1-G3: green primary color point
R1-R3: red primary color point
1100. 1100', 1100", 1100'", 1100"": light emitting module
1110: light-emitting unit
L1: blue light
L2: white light
1120: light guide plate
1130: color conversion layer
1140: optical film
1160: coating layer
1161. 1131: first layering
1162. 1132: second layering
1200: light modulation panel
1130: color filter
L3: display light
1000: display device
Detailed Description
Various elements (or features) are described herein using ordinal words (e.g., "first," "second," etc.), however, the various elements (or features) are not limited by the ordinal words. Ordinal words in this document are used only to distinguish between individual elements (or features). For example, a first element (or feature) could be termed a second element (or feature) without departing from the scope of the present invention. Similarly, a second element (or feature) may also be referred to as a first element (or feature).
The drawings in the present specification are illustrative and thus the illustrations of the drawings do not necessarily match the actual dimensions or proportions of the elements (or features) of the invention. The elements or features of the present invention are not limited by the dimensions or proportions shown in the drawings herein.
Fig. 2 shows an absorption spectrum and an emission spectrum of a red phosphor according to an embodiment of the present invention, wherein a dotted line may represent the absorption spectrum and a solid line may represent the emission spectrum. As shown in fig. 2, the absorption spectrum of the red phosphor of the present embodiment has an absorption peak p_ab, which occurs at an absorption peak wavelength w_ab that falls within a wavelength range of 560nm to 600nm (for example, in the present embodiment, the absorption peak wavelength w_ab may be 573 nm). As shown in fig. 2, in the present embodiment, the absorption band of the absorption spectrum is generally located in the wavelength range of 400 nm to 600nm as a whole. Since the absorption peak wavelength w_ab falls within the wavelength range of 560nm to 600nm, the red phosphor of the present embodiment can reduce energy waste and increase energy conversion efficiency when used in a display device equipped with a color filter.
As shown in fig. 2, the light emission spectrum of the red phosphor of the present embodiment has an emission peak p_em, which occurs at an emission peak wavelength w_em that is located in the red light band (620 nm to 750 nm) of visible light. The Stokes shift (Stokes shift) of the red phosphor of the present embodiment is less than 80 nm, in other words, the absorption peak wavelength w_ab and the emission peak wavelength w_em differ by less than 80 nm, so the absorption peak wavelength w_ab of the red phosphor falls in the wavelength range of 560nm to 600nm (near the red band). And therefore, the present embodiment can effectively utilize the energy of light filtered by the color filter between the red light band and the green light band.
In fig. 2, a hatched portion indicated by a diagonal line is an overlapping portion of the absorption spectrum and the emission spectrum. Self absorption (self absorption) occurs in a wavelength range covered by an overlapping portion of the absorption spectrum and the emission spectrum. The more pronounced the self-absorption, the more the luminous efficiency decreases and the emission peak wavelength of the spectrum is correspondingly more red-shifted (i.e., the value of the emission peak wavelength may increase), resulting in an increase in the proportion of light of longer wavelength and lower energy, which detracts from the luminous energy of the overall emission spectrum. As shown in fig. 2, in the present embodiment, the absorption spectrum of the red phosphor has an absorption rate at a wavelength 30 nm longer than the absorption peak wavelength w_ab of less than 50% of the absorption rate of the absorption peak p_ab, thereby forming a limit on the area of the shadow portion and reducing the influence of the self-absorption phenomenon.
One way in which the color reproduction capability of a display may be improved is to expand the color gamut. For example, one prior art technique uses a phosphor combination of KSF and β -SiAlON to achieve a wide color gamut, where β -SiAlON and KSF produce green and red light, respectively, upon absorbing blue light. In embodiments of the present invention, a red phosphor that absorbs light primarily in the wavelength range of 560nm to 600nm may be used in combination with β -SiAlON and the red phosphor and β -SiAlON absorption are energized with a blue LED to achieve a more expanded color gamut.
Referring to fig. 3A, a dotted line may represent an emission spectrum using a combination of KSF and β -SiAlON with a blue LED as an absorption source, and a solid line may represent an emission spectrum using a combination of red phosphor and β -SiAlON of the present disclosure with a blue LED as an absorption source. As described above, since the absorption peak wavelength of the red phosphor of the present embodiment falls within the wavelength range of 560nm to 600nm, as shown in fig. 3A, the light within the wavelength range of 560nm to 600nm in the light emission spectrum of the present embodiment appears to be distributed little by being mostly absorbed, and therefore, the green band (the band of 495 nm to 570 nm) of the light emission spectrum shown by the solid line is narrower than the green band shown by the broken line, in other words, the green band of the present embodiment covers a smaller wavelength range than the green band of the related art using KSF and β -SiAlON. In detail, referring to fig. 3B, fig. 3B shows the emission spectrum of the present embodiment alone, in the present embodiment, the emission spectrum has a green emission peak p_g, which occurs at a green emission peak wavelength w_g (in the present embodiment, the green emission peak wavelength w_g is 529 nm), and as shown in fig. 3B, in the emission spectrum of the present embodiment, the light intensity at a wavelength longer than the green emission peak wavelength w_g by 10 nm or more is lower than 80% of the emission intensity of the green emission peak p_g. In addition, the full width at half maximum of the green band of this embodiment is also smaller than that of the green band using KSF and β -SiAlON.
Referring again to fig. 3A, also because the absorption peak wavelength of the red phosphor of the present disclosure falls within the wavelength range of 560nm to 600nm, the green band (band in the wavelength range of 495-570 nm) and the red band (band in the wavelength range of 620-750 nm) of the emission spectrum of the present embodiment are far apart in peak wavelengths, while the green band and the red band of the emission spectrum using KSF and β -SiAlON are closer to each other in peak-to-straight wavelengths. In other words, the green and red bands of the light emission spectrum of the present embodiment appear to be more separated than the light emission spectrum using KSF and β -SiAlON.
Since the green spectral band of the emission spectrum of the present embodiment is narrower than the green spectral band of the emission spectrum using KSF and β -SiAlON, and the green spectral band and the red spectral band of the present embodiment appear more separated than the green spectral band and the red spectral band using KSF and β -SiAlON, the fewer the overlapping portions of the green spectral band and the red spectral band, the higher the color purity, the wider the color gamut can be achieved using the red phosphor of the present disclosure in combination with β -SiAlON than using the phosphor combination of KSF and β -SiAlON, as described in detail below.
Fig. 4 shows cie1931 color space (hereinafter referred to as color space) in XY chromaticity coordinates. As shown in fig. 4, the peripheral curve of the color space is a spectral locus (spectral locus), on which wavelengths in nanometers are marked, and the color passed through is the color of light of a single wavelength perceived by the human eye, moving along the spectral locus in the color space. For example, referring to FIG. 4, when a light ray having a single wavelength is gradually increased from 460 nm to 700 nm, the color seen by the human eye will gradually change from bluish to greenish, yellowish, orange, and reddish. The color inside the color space is then the color perceived by the human eye for light having a spectrum of non-single wavelengths, as opposed to the color on the spectral locus of a single wavelength (the peripheral curve of the color space).
Referring to fig. 5, color gamut CG1 is a format formulated by the National Television System Committee (NTSC), color gamut CG2 represents the color gamut of a display device using KSF and β -SiAlON, and color gamut CG3 represents the color gamut of a display device using a light emitting module according to some embodiments of the present invention.
The color gamut CG1 has a blue primary color point B1, a green primary color point G1 and a red primary color point R1, the color gamut CG2 has a blue primary color point B2, a green primary color point G2 and a red primary color point R2, and the color gamut CG3 has a blue primary color point B3, a green primary color point G3 and a red primary color point R3. Blue primary points B1-B3 are located in the area of the color space where they are bluish, green primary points G1-G3 are located in the area of the color space where they are greenish, and red primary points R1-R3 are located in the area of the color space where they are reddish.
In contrast, the green primary color point G3 and the red primary color point R3 of the color gamut of the present embodiment are separated, and the green primary color point G2 and the red primary color point R2 of the color gamut of the conventional display using KSF and β -SiAlON are closer, in other words, the connection line between the green primary color point G3 and the red primary color point R3 is longer, and the connection line between the green primary color point G2 and the red primary color point R2 is shorter, i.e. because the green band and the red band of the light spectrum of the present embodiment are separated (see fig. 3A). In addition, the narrower green band of the light emission spectrum of the present embodiment is also a reason why the green primary color point G2 is located above and to the left of the green primary color point G3 in the XY chromaticity diagram.
Since the connection between the green primary color point G3 and the red primary color point R3 is longer than the connection between the green primary color point G2 and the red primary color point R2, the color gamut CG3 occupies a larger area in the color space than the color gamut CG2, i.e., the combination of the red phosphor and β -SiAlON using the present disclosure can achieve a wider color gamut than the phosphor combination of KSF and β -SiAlON.
In addition, as shown in fig. 5, in the XY color gamut coordinate graph, the green primary color point G3 is located at the upper right of the green primary color point G1 of the NTSC color gamut CG1, that is, the X coordinate value Y coordinate values of the green primary color point G3 are all higher than the green primary color point G1. The area of the color gamut CG3 is larger than the area of the color gamut CG1 of NTSC.
In this embodiment, the coordinates of B1 may be (0.159,0.054), the coordinates of G1 may be (0.228,0.719), and the coordinates of R1 may be (0.696,0.293). However, this is merely illustrative, and the present invention is not limited thereto.
In one embodiment of the present invention, the red phosphor may be perylene (perylene), but this is only an example, and the present invention is not limited thereto.
In some embodiments of the present invention, the green phosphor may be any one of the following: beta-SiAlON, silicate, sulfide, quantum dots and other inorganic phosphors, organic phosphors and other green emitting color conversion materials, the invention is not limited to the foregoing materials.
Referring to fig. 6A, in some embodiments, the light emitting module 1100' may include a light emitting unit 1110 (e.g., a light emitting diode), a light guide plate 1120, a color conversion layer 1130, and an optical film 1140. Wherein, the red phosphor and the green phosphor are disposed in the color conversion layer 1130. In this embodiment, the light emitting module 1100' is a side-illumination light emitting module. As shown in fig. 6A, the blue light L1 emitted from the light emitting unit 1110 may enter the color conversion layer 1130 through the guiding of the light guide plate 1110, and the red phosphor and the green phosphor in the color conversion layer 1130 may absorb the blue light L1 and emit red light and green light, respectively, and the blue light L1 and the red light and the green light emitted from the phosphors are mixed to form white light L2. Depending on the specific design of the embodiments, the optical film 1140 may be a different type of optical film (e.g., a brightness enhancement film, a light expansion film, etc.) or a different combination of multiple types of optical films, and is used to adjust the light field of the white light L2. The spectrum of white light L2 may be, for example, but not limited to, the spectrum shown in fig. 3B.
Referring to fig. 6B, in some embodiments, the light emitting module 1100″ may include a light emitting unit 1110, a light guide plate 1120, and an optical film 1140, and the light emitting unit 1100 has a cladding layer 1160. Wherein, the coating layer 1160 is provided with red phosphor and green phosphor. The blue light emitted by the light emitting unit 1110 passes through the coating layer 1160 to form white light L2, and the white light L2 is guided by the light guide plate 1120 and the optical film 1140 adjusts the light field. In the present embodiments, the light emitting module 1100″ is a side-lit light emitting module.
Referring to fig. 7A, in some embodiments, the light emitting module 1100' "may include a plurality of light emitting units 1110, a color conversion layer 1130, and an optical film 1140. In the present embodiments, the light emitting module 1100' "is a direct type light emitting module.
Referring to fig. 7B, in some embodiments, the light emitting module 1100"" may include a plurality of light emitting units 1110 and an optical film 1140, where each light emitting unit 1100 has a cladding 1160. In the present embodiments, the light emitting module 1100' "is a direct type light emitting module.
Referring to fig. 8A, in some embodiments, the cladding layer 1160 may have a first layer 1161 and a second layer 1162, and red phosphor or green phosphor may be provided in the first layer 1161 and the second layer 1162, respectively. Embodiments in which the green phosphor is disposed in the first layer 1161 and the red phosphor is disposed in the second layer 1162 may result in better energy efficiency; embodiments in which red phosphors are disposed in the first layer 1161 and green phosphors are disposed in the second layer 1162 may result in a wider color gamut. However, the present invention is not limited thereto, and in other embodiments, the coating 1160 may not have layering, and red phosphor and green phosphor may be intermixed in the coating 1160.
Referring to fig. 8B, in some embodiments, the color conversion layer 1130 may include a first sub-layer 1131 and a second sub-layer 1132, and red phosphor or green phosphor may be disposed in the first sub-layer 1131 and the second sub-layer 1132, respectively. The embodiment in which the green phosphor is disposed in the first layer 1131 and the red phosphor is disposed in the second layer 1132 may result in better energy efficiency; embodiments in which red phosphor is disposed in the first layer 1131 and green phosphor is disposed in the second layer 1132 may result in a wider color gamut. However, the present invention is not limited thereto, and in other embodiments, the color conversion layer 1130 may not have a layering, and red phosphor and green phosphor may be provided in the color conversion layer 1130 in a mixed manner.
In the light emitting module of the foregoing embodiments, the embodiments in which the first phosphor and the second phosphor are coated on the light emitting unit can use less amount of phosphor to produce and save more cost, and can make the color uniformity of the display device better; the embodiment of the first phosphor and the second phosphor arranged on the color conversion layer is simpler in production, and the material is less influenced by light and heat and has better stability.
Referring to fig. 9, in some embodiments, the display device 1000 may have a backlight module 1100, a light modulation panel 1200 and a color filter 1300, wherein the backlight module 1100 may be a light emitting module according to the foregoing embodiments of the present invention, and the light modulation panel 1200 may be, for example, but not limited to, a liquid crystal panel. As shown in fig. 9, white light L2 emitted from the backlight module 1100 passes through the light modulation panel 1200 and the color filter 1300 to form display light L3. The color gamut of the display light L3 may be, for example, the color gamut CG3 shown in fig. 5.
Although the present invention has been described with reference to the above embodiments, it should be understood that the present invention is not limited thereto, and that various changes and modifications may be made by those skilled in the art without departing from the spirit and scope of the present invention, and the scope of the present invention is defined by the appended claims.
Claims (9)
1. A light emitting module, comprising:
a light emitting unit;
a first phosphor, the first phosphor being a green phosphor; and
a red phosphor having an absorption band in a wavelength range of 400 to 600nm, an absorption peak of the red phosphor occurring at an absorption peak wavelength falling in a wavelength range of 560 to 600nm, an absorption rate of the red phosphor for light having a wavelength longer than the absorption peak wavelength by more than 30 nm being less than 50% of the absorption peak,
wherein the red phosphor has a Stokes shift of 80 nm or less,
the light emitting module has a light emitting spectrum, wherein the light emitting spectrum has a green light emitting peak value, the green light emitting peak value occurs at a green light emitting peak wavelength, and in the light emitting spectrum, the light emitting intensity of a wavelength longer than the green light emitting peak wavelength by more than 10 nanometers is lower than 80% of the green light emitting peak value.
2. The light emitting module of claim 1, wherein the first phosphor and the red phosphor are coated on the light emitting unit.
3. The light emitting module of claim 1, further comprising a color conversion layer for receiving light emitted from the light emitting unit, wherein the first phosphor and the red phosphor are disposed in the color conversion layer.
4. A light emitting module according to claim 2 or 3, wherein the first phosphor and the red phosphor are provided in a hybrid arrangement.
5. A light emitting module according to claim 2 or 3, wherein the first phosphor is provided in a first layer and the red phosphor is provided in a second layer, the second layer being closer to the light emitting unit than the first layer.
6. A light emitting module according to claim 2 or 3, wherein the first phosphor is provided in a first layer and the red phosphor is provided in a second layer, the first layer being closer to the light emitting unit than the second layer.
7. The light emitting module of claim 1, wherein the red phosphor is a perylene.
8. A display device, comprising:
a backlight module, comprising:
a light emitting unit;
a first phosphor, the first phosphor being a green phosphor; and
a red phosphor having an absorption band in a wavelength range of 400 to 600 nanometers, an absorption peak of the red phosphor occurring at an absorption peak wavelength falling in a wavelength range of 560 to 600 nanometers, the red phosphor having an absorption rate of less than 50% of the absorption peak for light having a wavelength longer than the absorption peak wavelength by more than 30 nanometers;
a light modulation panel; and
a light filter, wherein a backlight emitted by the backlight module passes through the light modulation panel and the light filter to form a display light,
wherein the red phosphor has a Stokes shift of 80 nm or less,
the backlight module has a light emission spectrum, wherein the light emission spectrum has a green light emission peak value, the green light emission peak value occurs at a green light emission peak wavelength, and in the light emission spectrum, the light emission intensity of the wavelength which is longer than the green light emission peak wavelength by more than 10 nanometers is lower than 80% of the green light emission peak value.
9. The display device of claim 8, wherein an area of a color gamut of the display device is greater than an area of an NTSC color gamut in XY color coordinates.
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| TW109141400A TWI781482B (en) | 2020-11-25 | 2020-11-25 | Light emitting device and display device using the same |
| TW109141400 | 2020-11-25 |
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| EP1759145A1 (en) * | 2004-05-28 | 2007-03-07 | Tir Systems Ltd. | Luminance enhancement apparatus and method |
| JP2011181579A (en) * | 2010-02-26 | 2011-09-15 | Panasonic Corp | Light emitting device, and illumination light source, display unit and electronic apparatus including the same |
| TWI468810B (en) * | 2012-11-05 | 2015-01-11 | Innocom Tech Shenzhen Co Ltd | Backlight module |
| CN111812889B (en) * | 2015-07-10 | 2023-03-24 | 迪睿合株式会社 | Phosphor sheet, white light source device provided with same, and display device provided with same |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104810357A (en) * | 2015-04-02 | 2015-07-29 | 信利半导体有限公司 | Display, backlight module and LED light source device |
| CN108352432A (en) * | 2015-09-10 | 2018-07-31 | 英特曼帝克司公司 | For general illumination and the Phosphor converted white light light-emitting device and photoluminescent compounds of display backlight |
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| CN113113527A (en) | 2021-07-13 |
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