WO2015025743A1 - 液晶表示装置 - Google Patents
液晶表示装置 Download PDFInfo
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- WO2015025743A1 WO2015025743A1 PCT/JP2014/071059 JP2014071059W WO2015025743A1 WO 2015025743 A1 WO2015025743 A1 WO 2015025743A1 JP 2014071059 W JP2014071059 W JP 2014071059W WO 2015025743 A1 WO2015025743 A1 WO 2015025743A1
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- transmission spectrum
- transmittance
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- wavelength
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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
- G02F1/133621—Illuminating devices providing coloured light
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
- G02B5/201—Filters in the form of arrays
-
- 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
- G02F1/133509—Filters, e.g. light shielding masks
- G02F1/133514—Colour filters
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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
- G02F1/133603—Direct backlight with LEDs
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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
- G02F1/1343—Electrodes
- G02F1/134309—Electrodes characterised by their geometrical arrangement
- G02F1/134363—Electrodes characterised by their geometrical arrangement for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]
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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
- G02F1/133357—Planarisation layers
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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
- G02F1/133614—Illuminating devices using photoluminescence, e.g. phosphors illuminated by UV or blue light
Definitions
- the present invention relates to a liquid crystal display device.
- a pseudo white LED (light emitting diode) is generally used as a light source for a backlight of a liquid crystal display device.
- the pseudo-white LED an LED that emits blue light and a yellow phosphor that emits yellow light when excited by blue light are used in combination, thereby realizing white light emission (therefore, blue-yellow pseudo-white).
- LED sometimes called LED.
- the pseudo white LED is excellent in terms of luminous efficiency and cost.
- Patent Document 1 proposes a technique for performing brighter display in a liquid crystal display device including a pseudo white LED. According to Patent Document 1, the brightness of white display is increased without changing the chromaticity coordinates of white display by combining a pseudo white LED having a predetermined emission spectrum and a color filter having a predetermined spectral transmission characteristic. It is described that it can.
- the emission spectrum of the pseudo white LED is relatively broad in the visible light region. Therefore, in order to cope with high color purity, it is necessary to perform spectral (color separation) with the color filter sufficiently by strictly controlling the spectral transmission characteristics of the color filter. For this reason, the transmittance of the color filter is lowered, and the transmittance of the entire liquid crystal display panel (panel transmittance) is also lowered. In addition, the increase in the thickness of the color filter may cause light leakage (referred to as “color washout”) from adjacent pixels during observation from an oblique direction. Furthermore, when the area of the light shielding layer is increased in order to prevent such light leakage, the aperture ratio is lowered, and the panel transmittance is further lowered.
- Patent Document 1 does not describe how much effect can be obtained specifically (that is, how high the brightness of white display can be obtained), and the spectral characteristics of the color filter. The transmittance characteristics are not specified in detail. Furthermore, even if the technique of Patent Document 1 is used, it is considered difficult to realize a color specification corresponding to blue in a high color purity standard (such as the sRGB standard and the AdobeRGB standard described above).
- the present invention has been made in view of the above problems, and an object thereof is to provide a liquid crystal display device which is excellent in color reproducibility and can realize high panel transmittance.
- a liquid crystal display device is a liquid crystal display device including a liquid crystal display panel having a red color filter, a green color filter, and a blue color filter, and an illumination element that emits light to the liquid crystal display panel.
- the spectrum of light emitted from the illumination element has a peak in each of the wavelength ranges of 447 nm to 453 nm, 538 nm to 542 nm, 613 nm to 617 nm, 628 nm to 632 nm, and 648 nm to 652 nm.
- the peak wavelength and the rising wavelength of the transmission spectrum of the color filter are 600 nm or more and 568 nm or more and 572 nm or less, respectively, and the transmission spectrum of the red color filter is 10% or less at wavelengths of 400 nm, 420 nm, and 580 nm, respectively.
- the wavelength which shows the transmittance of 15% or less, 3% or more and 6% or less and 25% or more and 30% or less, and the transmission spectrum of the red color filter shows the transmittance of 50% is included in the range of 583 nm or more and 587 nm or less.
- the peak wavelength of the transmission spectrum of the green color filter is 500 nm to 560 nm, and the transmission spectrum of the green color filter is 45% to 55% and 65% to 70% at wavelengths of 480 nm and 580 nm, respectively.
- permeability of 50% is contained in each of the range of 478 nm or more and 482 nm or less and 590 nm or more and 600 nm or less,
- the peak wavelength of the transmission spectrum is 440 nm or more and 470 nm or less.
- the blue color filter has a transmittance of 25% to 40% and 40% to 50% at wavelengths of 400 nm and 500 nm, respectively, and the blue color filter has a transmittance of 50%. Is included in the range of 493 nm to 503 nm.
- a liquid crystal display device includes a liquid crystal display panel having a red color filter, a green color filter, and a blue color filter, and an illumination element that emits light to the liquid crystal display panel.
- the spectrum of light emitted from the illumination element has a peak in each of the wavelength ranges of 447 nm to 453 nm, 528 nm to 532 nm, 613 nm to 617 nm, 628 nm to 632 nm, and 648 nm to 652 nm
- the peak wavelength and rising wavelength of the transmission spectrum of the red color filter are 600 nm or more and 568 nm or more and 572 nm or less, respectively, and the transmission spectrum of the red color filter is respectively at wavelengths of 400 nm, 420 nm and 580 nm.
- the wavelength of 10% or more and 15% or less, 3% or more and 6% or less, and 25% or more and 30% or less, and the transmission spectrum of the red color filter exhibits a transmittance of 50% is in the range of 583 nm or more and 587 nm or less.
- the transmission wavelength of the green color filter is 520 nm or more and 540 nm or less, and the transmission spectrum of the green color filter is 15% or more and 20% or less and 20% at wavelengths of 480 nm and 560 nm, respectively.
- Wavelengths exhibiting a transmittance of 30% or less and having a transmittance of 50% for the green color filter are included in the ranges of 498 nm to 502 nm and 540 nm to 550 nm, respectively.
- the peak wavelength of the transmission spectrum of the color filter is 465 nm or more 4 And a 5nm or less, the transmission spectrum of the blue color filter showed 25% or less transmittance of each of 20% or more at a wavelength of 400nm and 500 nm, and shows a transmittance of 40% or less at the peak wavelength.
- a liquid crystal display device includes a liquid crystal display panel having a red color filter, a green color filter, and a blue color filter, and an illumination element that emits light to the liquid crystal display panel.
- the spectrum of light emitted from the illumination element has a peak in each of the wavelength ranges of 447 nm to 453 nm, 528 nm to 532 nm, 613 nm to 617 nm, 628 nm to 632 nm, and 648 nm to 652 nm,
- the peak wavelength and the rising wavelength of the transmission spectrum of the red color filter are 600 nm or more and 573 nm or more and 577 nm or less, respectively.
- the transmission spectrum of the red color filter has a transmission spectrum of 5% or less within a wavelength range of 400 nm or more and 560 nm or less.
- the wavelength at which the transmission spectrum of the red color filter exhibits a transmittance of 50% is included in the range of 590 nm to 595 nm, and the peak wavelength of the transmission spectrum of the green color filter is 520 nm to 540 nm
- the transmission spectrum of the green color filter exhibits a transmittance of 15% to 20% and 20% to 30% at wavelengths of 480 nm and 560 nm, respectively, and the transmission spectrum of the green color filter is 50% transmission.
- the wavelength indicating the rate is included in each of the range of 498 nm to 502 nm and 540 nm to 550 nm, the peak wavelength of the transmission spectrum of the blue color filter is 465 nm to 475 nm, The transmission spectrum has a wavelength of 400 In m and 500nm showed 25% or less transmittance of 20% or more, respectively, and show a 40% or less of the transmittance in the peak wavelength.
- each of the red color filter, the green color filter, and the blue color filter has a thickness of 1.5 ⁇ m or less.
- the liquid crystal display panel includes a color filter substrate having the red color filter, the green color filter, and the blue color filter, and the color filter substrate includes the red color filter, the green color filter, and the It further has a flattening layer formed so as to cover the blue color filter.
- the liquid crystal display device having the above-described configuration performs display in the horizontal electric field mode.
- the illumination element absorbs excitation light emitted from the light emitting element that emits excitation light, a green phosphor that emits green light by absorbing excitation light emitted from the light emitting element, and a light emitting element that emits green light. And a red phosphor that emits red light.
- liquid crystal display device that is excellent in color reproducibility and can realize high panel transmittance.
- FIG. 6 is a graph showing an emission spectrum of the illumination element 2 and a transmission spectrum of the color filter layer 22 (a red color filter 22R, a green color filter 22G, and a blue color filter 22B) in the first embodiment. It is a graph which shows the emission spectrum of the illumination element in the comparative example 1, and the transmission spectrum of a color filter layer (a red color filter, a green color filter, and a blue color filter). 5 is a graph showing the emission spectrum of the illumination element 2 of Embodiment 1 and the emission spectrum of the illumination element of Comparative Example 1 together.
- 4 is a graph showing a transmission spectrum of a red color filter 22R of Embodiment 1 and a transmission spectrum of a red color filter of Comparative Example 1 together.
- 4 is a graph showing a transmission spectrum of a green color filter 22G of Embodiment 1 and a transmission spectrum of a green color filter of Comparative Example 1 together.
- 4 is a graph showing a transmission spectrum of a blue color filter 22B of Embodiment 1 and a transmission spectrum of a blue color filter of Comparative Example 1 together. It is a graph which shows collectively the emission spectrum of the illumination element 2 of Embodiment 2, and the emission spectrum of the illumination element 2 of Embodiment 1.
- 10 is a graph showing a transmission spectrum of a red color filter 22R of Embodiment 2 and a transmission spectrum of a red color filter of Comparative Example 2 together. It is a graph which shows together the transmission spectrum of green color filter 22G of Embodiment 2, and the transmission spectrum of the green color filter of comparative example 2. It is a graph which shows together the transmission spectrum of blue color filter 22B of Embodiment 2, and the transmission spectrum of the blue color filter of comparative example 2. 10 is a graph showing a transmission spectrum of a red color filter 22R of Embodiment 3 and a transmission spectrum of a red color filter of Comparative Example 3 together.
- (A) is a figure which shows typically a mode that color washout generate
- (b) is generation
- (A) and (b) change the total (total thickness) of the thickness t of the color filter layer 22 and the thickness t ′ of the flattening layer 24, and blue and oblique 75 when observed from the front direction.
- FIG. 1 is a plan view schematically showing a liquid crystal display panel 1 included in an FFS mode liquid crystal display device 100.
- FIG. 1 is a plan view schematically showing a liquid crystal display panel 1 included in an FFS mode liquid crystal display device 100.
- FIG. 1 A) And (b) is a top view which shows typically the TFT substrate 10 and the color filter substrate 20 with which the liquid crystal display device 100 of FFS mode is provided, respectively.
- (A) is a cross-sectional view taken along line 18A-18A 'in FIG. 16, and
- (b) is a cross-sectional view taken along line 18B-18B' in FIG. 2 is a cross-sectional view schematically showing the illumination element 2.
- FIG. 1 shows a liquid crystal display device 100 according to an embodiment of the present invention.
- FIG. 1 is a cross-sectional view schematically showing the liquid crystal display device 100.
- the liquid crystal display device 100 includes a liquid crystal display panel 1 and an illumination element (backlight) 2 as shown in FIG.
- the liquid crystal display device 100 has a plurality of pixels arranged in a matrix.
- the plurality of pixels include a red pixel that displays red, a green pixel that displays green, and a blue pixel that displays blue.
- One color display pixel is constituted by three pixels (red pixel, green pixel, and blue pixel) that display different colors.
- the liquid crystal display panel 1 includes an active matrix substrate (hereinafter referred to as “TFT substrate”) 10, a color filter substrate (sometimes referred to as “counter substrate”) 20 facing the TFT substrate 10, and the TFT substrate 10. And a liquid crystal layer 30 provided between the color filter substrates 20.
- TFT substrate active matrix substrate
- counter substrate color filter substrate
- liquid crystal layer 30 provided between the color filter substrates 20.
- the TFT substrate 10 has a pixel electrode provided in each pixel and a thin film transistor (TFT) electrically connected to the pixel electrode (all not shown).
- the TFT substrate 10 further includes a scanning wiring for supplying a scanning signal to the TFT and a signal wiring for supplying a display signal to the TFT (all not shown).
- the color filter substrate 20 includes a red color filter 22R, a green color filter 22G, a blue color filter 22B, and a light shielding layer (black matrix) 23.
- the red color filter 22R, the green color filter 22G, and the blue color filter 22B are provided in a region corresponding to the red pixel, a region corresponding to the green pixel, and a region corresponding to the blue pixel, respectively.
- the red color filter 22R, the green color filter 22G, and the blue color filter 22B may be collectively referred to as a color filter layer 22.
- the light shielding layer 23 is provided between adjacent pixels.
- the color filter layer 22 and the light shielding layer 23 are supported by a transparent substrate (for example, a glass substrate) 21 having an insulating property.
- the color filter substrate 20 further includes a planarizing layer 24 formed so as to cover the color filter layer 22.
- the planarization layer 24 may be omitted.
- the color filter substrate 20 When a TN (Twisted Nematic) mode or a VA (Vertical Alignment) mode is employed as the display mode, the color filter substrate 20 further includes a counter electrode (common electrode) provided to face the pixel electrode.
- a TN (Twisted Nematic) mode or a VA (Vertical Alignment) mode is employed as the display mode
- the color filter substrate 20 further includes a counter electrode (common electrode) provided to face the pixel electrode.
- the VA mode for example, an MVA (Multi-domain Vertical Alignment) mode and a CPA (Continuous Pinwheel Alignment) mode are known.
- the TFT substrate 10 When the horizontal electric field mode is adopted as the display mode, the TFT substrate 10 further includes a common electrode in addition to the pixel electrode.
- the transverse electric field mode for example, an IPS (In-Plane switching) mode and an FFS (Fringe field switching) mode are known.
- liquid crystal layer 30 for example, a horizontal alignment type liquid crystal layer or a vertical alignment type liquid crystal layer is provided according to the display mode employed.
- An alignment film (not shown) is provided on the surface of each of the TFT substrate 10 and the color filter substrate 20 on the liquid crystal layer 30 side.
- the illumination element 2 irradiates the liquid crystal display panel 1 with light.
- the illumination element 2 is disposed on the back side (the side opposite to the observer) of the liquid crystal display panel 1.
- the spectrum of light emitted from the illumination element 2 and the transmission spectra of the red color filter 22R, the green color filter 22G, and the blue color filter 22B are described as Embodiments 1 to 3 below. It is set to be explained, thereby realizing excellent color reproducibility and high panel transmittance. For this reason, the liquid crystal display device 100 can have high luminance and low power consumption.
- the emission spectrum of the illumination element 2 and the transmission spectrum of the color filter layer 22 are set so that the color specification of the liquid crystal display device 100 corresponds to the sRGB standard.
- FIG. 2 shows the emission spectrum of the illumination element 2 and the transmission spectrum of the color filter layer 22 (red color filter 22R, green color filter 22G, and blue color filter 22B) in the present embodiment.
- FIG. 3 shows the emission spectrum of the illumination element and the transmission spectrum of the color filter layers (red color filter, green color filter and blue color filter) in the liquid crystal display device of Comparative Example 1.
- the illumination element of the liquid crystal display device of Comparative Example 1 has a blue-yellow pseudo white LED as a light source, and the red color filter, the green color filter, and the blue color filter of the liquid crystal display device of Comparative Example 1 comply with the sRGB standard. Corresponding spectral transmission characteristics are optimized for blue-yellow pseudo white LEDs. Note that only the transmittance (%) is shown on the scale of the vertical axis in FIGS. 2 and 3 (that is, the emission intensity is not shown).
- the emission spectrum of the illumination element 2 in this embodiment is different from the emission spectrum of the illumination element of Comparative Example 1.
- the transmission spectra of the red color filter 22R, the green color filter 22G, and the blue color filter 22B in the present embodiment are different from the transmission spectra of the red color filter, the green color filter, and the blue color filter of Comparative Example 1. The above differences will be further described below with reference to FIGS.
- FIG. 4 is a graph showing the emission spectrum of the illumination element 2 in the present embodiment and the emission spectrum of the illumination element of Comparative Example 1 together.
- the spectrum of light emitted by the illumination element 2 of the present embodiment is 447 nm to 453 nm, 538 nm to 542 nm, 613 nm to 617 nm, 628 nm to 632 nm, and 648 nm to 652 nm, respectively. It has a peak inside. That is, the emission spectrum of the illumination element 2 of the present embodiment has one peak in the wavelength range corresponding to blue and one in the wavelength range corresponding to green, and three peaks in the wavelength range corresponding to red. Have. In contrast, the emission spectrum of the lighting element of Comparative Example 1 has peaks in the wavelength range corresponding to blue and in the wavelength range corresponding to green, but in the wavelength range corresponding to red. Does not have a peak.
- FIG. 5 is a graph showing the transmission spectrum of the red color filter 22R in the present embodiment and the transmission spectrum of the red color filter of Comparative Example 1 together.
- the peak wavelength and the rising wavelength of the transmission spectrum of the red color filter 22R of the present embodiment are 600 nm or more and 568 nm or more and 572 nm or less, respectively.
- the “rising wavelength” is the beginning of a wavelength region where the transmittance increase per 5 nm is 15% or more.
- the transmission spectrum of the red color filter 22R of the present embodiment shows a transmittance of 10% to 15%, 3% to 6%, and 25% to 30% at wavelengths of 400 nm, 420 nm, and 580 nm, respectively. Furthermore, the wavelength at which the transmission spectrum of the red color filter 22R of the present embodiment exhibits a transmittance of 50% is included in the range of 583 nm or more and 587 nm or less.
- FIG. 6 is a graph showing the transmission spectrum of the green color filter 22G in the present embodiment and the transmission spectrum of the green color filter of Comparative Example 1 together.
- the peak wavelength of the transmission spectrum of the green color filter 22G of the present embodiment is not less than 500 nm and not more than 560 nm.
- the transmission spectrum of the green color filter 22G of the present embodiment shows a transmittance of 45% to 55% and 65% to 70% at wavelengths of 480 nm and 580 nm, respectively. Furthermore, the wavelength at which the transmission spectrum of the green color filter 22G of the present embodiment exhibits a transmittance of 50% is included in the ranges of 478 nm to 482 nm and 590 nm to 600 nm, respectively.
- FIG. 7 is a graph showing the transmission spectrum of the blue color filter 22B in the present embodiment and the transmission spectrum of the blue color filter of Comparative Example 1 together.
- the peak wavelength of the transmission spectrum of the blue color filter 22B of the present embodiment is not less than 440 nm and not more than 470 nm.
- the transmission spectrum of the blue color filter 22B of the present embodiment shows a transmittance of 25% to 40% and 40% to 50% at wavelengths of 400 nm and 500 nm, respectively. Furthermore, the wavelength at which the transmission spectrum of the blue color filter 22B of this embodiment exhibits a transmittance of 50% is included in the range of 493 nm to 503 nm.
- Comparative Example 1 As shown in FIGS. 3 and 4, the light emitted from the illumination element (that is, the light emitted from the blue-yellow pseudo white LED) is not clearly separated from the red component and the green component.
- the red component and the green component in the light emitted from the illumination element 2, the red component and the green component (of course, the blue component) are clearly separated. Therefore, in the present embodiment, the degree of spectroscopy in the color filter layer 22 may be less than that in the first comparative example.
- the transmittance of the color filter layer 22 can be kept high. it can. Therefore, the panel transmittance is improved.
- Table 1 below shows the transmittance (average transmittance in the visible light region) of each of the red color filter 22R, the green color filter 22G, and the blue color filter 22B in the present embodiment, and the entire color filter layer 22 (that is, the total).
- the transmittance is shown.
- Table 2 below shows the transmittance (average transmittance in the visible light region) of the red color filter, the green color filter, and the blue color filter in Comparative Example 1, and the transmittance of the entire color filter layer (that is, the total). It shows.
- Tables 1 and 2 for each of the present embodiment and Comparative Example 1, chromaticity x of red displayed by red pixels, green displayed by green pixels, and blue displayed by blue pixels, respectively. , Y are also shown.
- the emission spectrum of the illumination element 2 and the transmission spectrum of the color filter layer are set so that the color specification of the liquid crystal display device 100 corresponds to the AdobeRGB standard.
- the emission spectrum of the illumination element 2 and the transmission spectrum of the color filter layer 22 in this embodiment, and the emission spectrum of the illumination element and the transmission spectrum of the color filter layer in Comparative Example 2 are compared.
- the illumination element of the liquid crystal display device of Comparative Example 2 has a blue-yellow pseudo white LED as a light source, and the red color filter, the green color filter, and the blue color filter of the liquid crystal display device of Comparative Example 2 comply with the AdobeRGB standard. Corresponding spectral transmission characteristics are optimized for blue-yellow pseudo white LEDs.
- FIG. 8 is a graph showing both the emission spectrum of the illumination element 2 in the present embodiment and the emission spectrum of the illumination element 2 in the first embodiment. Since the emission spectrum of the lighting element of Comparative Example 2 is the same as the emission spectrum of the lighting element of Comparative Example 1, see FIG.
- the spectrum of light emitted from the illumination element 2 of the present embodiment is 447 nm to 453 nm, 528 nm to 532 nm, 613 nm to 617 nm, 628 nm to 632 nm, and 648 nm to 652 nm, respectively. It has a peak inside.
- the green peak wavelength is around 540 nm (within a range of 538 nm or more and 542 nm or less), whereas in the emission spectrum of the lighting element 2 of the present embodiment, the green peak wavelength is Is in the vicinity of 530 nm (within a range from 528 nm to 532 nm), and the emission spectrum of the illumination element 2 of the present embodiment is different from the emission spectrum of the illumination element of the first embodiment in this respect. This difference is due to the fact that the green color gamut is wider in the AdobeRGB standard than in the sRGB standard.
- the emission spectrum of the illumination element 2 of the present embodiment is also different from the emission spectrum of the illumination element of Comparative Example 2.
- the emission spectrum of the illumination element 2 of the present embodiment has one peak in the wavelength range corresponding to blue and one in the wavelength range corresponding to green, and three peaks in the wavelength range corresponding to red.
- the emission spectrum of the lighting element of Comparative Example 2 has peaks in the wavelength range corresponding to blue and in the wavelength range corresponding to green, but peaks in the wavelength range corresponding to red. Does not have.
- FIG. 9 is a graph showing the transmission spectrum of the red color filter 22R in the present embodiment and the transmission spectrum of the red color filter of Comparative Example 2 together.
- the peak wavelength and the rising wavelength of the transmission spectrum of the red color filter 22R of the present embodiment are 600 nm or more and 568 nm or more and 572 nm or less, respectively.
- the transmission spectrum of the red color filter 22R of the present embodiment shows a transmittance of 10% to 15%, 3% to 6%, and 25% to 30% at wavelengths of 400 nm, 420 nm, and 580 nm, respectively. Furthermore, the wavelength at which the transmission spectrum of the red color filter 22R of the present embodiment exhibits a transmittance of 50% is included in the range of 583 nm or more and 587 nm or less.
- FIG. 10 is a graph showing the transmission spectrum of the green color filter 22G in the present embodiment and the transmission spectrum of the green color filter of Comparative Example 2 together.
- the peak wavelength of the transmission spectrum of the green color filter 22G of the present embodiment is not less than 520 nm and not more than 540 nm.
- the transmission spectrum of the green color filter 22G of the present embodiment shows a transmittance of 15% to 20% and 20% to 30% at wavelengths of 480 nm and 560 nm, respectively. Further, the wavelengths at which the transmission spectrum of the green color filter 22G of the present embodiment exhibits a transmittance of 50% are included in the ranges of 498 nm to 502 nm and 540 nm to 550 nm, respectively.
- FIG. 11 is a graph showing the transmission spectrum of the blue color filter 22B in the present embodiment and the transmission spectrum of the blue color filter of Comparative Example 2 together.
- the peak wavelength of the transmission spectrum of the blue color filter 22B of the present embodiment is not less than 465 nm and not more than 475 nm.
- the transmission spectrum of the blue color filter 22B of the present embodiment shows a transmittance of 20% to 25% at wavelengths of 400 nm and 500 nm, respectively, and a transmittance of 40% or less at the peak wavelength.
- the light emitted from the illumination element does not clearly separate the red component and the green component as shown in FIG.
- the red component and the green component are clearly separated. Therefore, in this embodiment, the degree of spectroscopy in the color filter layer 22 may be less than that in Comparative Example 2. Therefore, even if the spectral transmission characteristics of the color filter layer 22 are adjusted so as to correspond to the AdobeRGB standard (the color filter material is selected as such), the transmittance of the color filter layer 22 can be kept high. it can. Therefore, the panel transmittance is improved.
- Table 3 shows the transmittance (average transmittance in the visible light region) of each of the red color filter 22R, the green color filter 22G, and the blue color filter 22B in this embodiment, and the entire color filter layer 22 (that is, the total).
- the transmittance is shown.
- Table 4 shows the transmittance (average transmittance in the visible light region) of the red color filter, the green color filter, and the blue color filter in Comparative Example 2, and the transmittance of the entire color filter layer (that is, the total). It shows.
- Tables 3 and 4 for each of the present embodiment and Comparative Example 2, chromaticity x of red displayed by red pixels, green displayed by green pixels, and blue displayed by blue pixels, respectively. , Y are also shown.
- the light emission spectrum and the color filter layer of the illumination element 2 are set so that the color specification of the liquid crystal display device 100 corresponds to the AdobeRGB standard, and red also corresponds to the DCI (Digital-Cinema-Initiatives) standard.
- the transmission spectrum is set.
- the emission spectrum of the illumination element 2 of the present embodiment, the transmission spectrum of the green color filter 22G, and the transmission spectrum of the blue color filter 22B are the same as those of the second embodiment.
- the red color filter of the liquid crystal display device of Comparative Example 3 has spectral transmission characteristics optimized for a blue-yellow pseudo white LED so as to correspond to the DCI standard.
- FIG. 12 is a graph showing the transmission spectrum of the red color filter 22R in the present embodiment and the transmission spectrum of the red color filter of Comparative Example 2 together.
- the peak wavelength and the rising wavelength of the transmission spectrum of the red color filter 22R of this embodiment are 600 nm or more and 573 nm or more and 577 nm or less, respectively.
- the transmission spectrum of the red color filter 22R of the present embodiment shows a transmittance of 5% or less within a wavelength range of 400 nm or more and 560 nm or less. Furthermore, the wavelength at which the transmission spectrum of the red color filter 22R of this embodiment exhibits a transmittance of 50% is included in the range of 590 nm to 595 nm.
- the spectral transmission characteristics of the color filter layer 22 so as to correspond to the AdobeRGB standard (and also to correspond to the DCI standard for red). Even if this is adjusted, the transmittance of the color filter layer 22 can be kept high. Therefore, the panel transmittance is improved.
- Table 5 shows the transmittance (average transmittance in the visible light region) of each of the red color filter 22R, the green color filter 22G, and the blue color filter 22B in this embodiment, and the entire color filter layer 22 (that is, the total).
- the transmittance is shown.
- Table 6 shows the transmittance (average transmittance in the visible light region) of the red color filter, the green color filter, and the blue color filter in Comparative Example 3, and the transmittance of the entire color filter layer (that is, the total). It shows.
- Tables 5 and 6 for each of the present embodiment and Comparative Example 3, chromaticity x of red displayed by red pixels, green displayed by green pixels, and blue displayed by blue pixels, respectively. , Y are also shown.
- the emission spectrum of the illumination element 2 and the transmission spectrum of the color filter layer 22 are set as described in the first to third embodiments. Color reproducibility and high panel transmittance. For this reason, the liquid crystal display device 100 can have high luminance and low power consumption.
- the fact that the degree of spectral separation in the color filter layer 22 may be small also means that the thickness of the color filter layer 22 can be made smaller than the thickness of the color filter layers of Comparative Examples 1 to 3.
- the thickness of the color filter layer 22 (the thickness of each of the red color filter 22R, the green color filter 22G, and the blue color filter 22B) t is 1.5 ⁇ m or less.
- FIG. 13A schematically shows how color washout occurs in the liquid crystal display device 200 of the comparative example.
- FIG. 13B schematically shows how the color washout is suppressed in the liquid crystal display device 100 according to the embodiment of the present invention.
- 13A and 13B only the blue pixel is lit (that is, the voltage is applied only to the liquid crystal layer 30 of the blue pixel, and the alignment state of only the liquid crystal molecules 31 of the blue pixel is changed. ) The state is illustrated.
- the transmission spectrum of the color filter layer 22 is optimized for the blue-yellow pseudo white LED so that the color specification corresponds to the high color purity standard (Comparative Example 1 described above). Therefore, the thickness t of the color filter layer 22 is about 2.0 ⁇ m to 3.0 ⁇ m, and the distance between the liquid crystal layer 30 and the light shielding layer 23 is increased. . Therefore, only blue (that is, only the light L1 that has passed through the blue color liquid crystal layer 30 and then transmitted through the blue color filter 22B) is visually recognized during front observation, but red (that is, blue pixels) during oblique observation at a shallow angle.
- the light L2 transmitted through the red color filter 22R after passing through the liquid crystal layer 30) and green (that is, the light L3 transmitted through the green color filter 22G after passing through the liquid crystal layer 30 of the blue pixel) are also visually recognized.
- the thickness of the color filter layer 20 is large, light leakage from adjacent pixels occurs, thereby degrading display quality.
- the thickness of the color filter layer 20 can be 1.5 ⁇ m or less, the distance between the liquid crystal layer 30 and the light shielding layer 23 is reduced. be able to. Therefore, light leakage from adjacent pixels is less likely to occur during oblique observation at a shallow angle. That is, in the example of FIG. 13B (example in which only the blue pixel is lit), red (light L2) and green (light L3) leaking from the adjacent pixels are not visually recognized when oblique observation is performed at a considerably deep angle. Not. As described above, since the thickness of the color filter layer 20 is small, the occurrence of light leakage (color washout) from adjacent pixels is suppressed.
- the presence or absence of light leakage from adjacent pixels depends on the distance between the liquid crystal layer 30 and the light shielding layer 23.
- total thickness the total of the thickness t of the color filter layer 22 and the thickness t ′ of the flattening layer 24 (hereinafter referred to as “total thickness”) is changed, and blue and oblique when observed from the front direction.
- total thickness the total of the thickness t of the color filter layer 22 and the thickness t ′ of the flattening layer 24
- FIG. 14A is a graph showing the relationship between the chromaticity x obtained by the simulation and the total thickness ( ⁇ m), and FIG. 14B shows the chromaticity y obtained by the simulation and the total thickness. It is a graph which shows the relationship with (micrometer).
- FIGS. 14A and 14B also show the allowable chromaticity change range (chromaticity change allowable range).
- the total thickness is about 3 ⁇ m or less for both chromaticity x and y, the chromaticity shift during oblique observation is within the chromaticity change allowable range. You can see that it fits.
- the thickness t ′ of the flattening film 24 is preferably 1.5 ⁇ m or more. Therefore, when the thickness t of the color filter layer 22 is 1.5 ⁇ m or less, the total thickness can be 3 ⁇ m or less, and the deterioration of display quality due to color washout can be prevented.
- the presence or absence of the color washout depends on the distance between the liquid crystal layer 30 and the light shielding layer 23. Therefore, the color washout is performed in the flattening layer 24 rather than the configuration in which the flattening layer 24 is not provided. It can be said that it is easy to generate
- the planarization layer 24 is preferably provided for the following reason. In the horizontal electric field mode, unlike the vertical electric field mode (TN mode or VA mode), an electrode (transparent electrode layer) is not provided on the liquid crystal layer side of the counter substrate (color filter substrate). The filter material will be exposed.
- the dielectric materials of the red color filter, the green color filter, and the blue color filter are different from each other, it becomes difficult to generate an appropriate lateral electric field. To prevent this, a flattening layer is provided. Is preferred. Therefore, it can be said that the significance (effect) of adopting the configuration as in the embodiment of the present invention is great when the display mode is the horizontal electric field mode.
- the thickness t of the color filter layer 22 (the thickness of each of the red color filter 22R, the green color filter 22G, and the blue color filter 22B) t is 1.5 ⁇ m or less, the observation from an oblique direction is performed. Occurrence of light leakage from adjacent pixels at the time can be suppressed, and display quality can be improved.
- the area of the light shielding layer 23 may be reduced until the light leakage from the adjacent pixels becomes approximately the same as that of the liquid crystal display device 200 of the comparative example. Utilization efficiency can be further increased.
- the area of the light shielding layer 23 may be increased. In that case, the aperture ratio decreases, but according to the embodiment of the present invention, the transmittance of the color filter layer 22 can be increased, so that the panel transmittance equal to or higher than that of the conventional one can be ensured.
- the transmittance of the color filter layer 22 can be increased, so that the panel transmittance equal to or higher than that of the conventional one can be ensured.
- FIG. 15A is a plan view schematically showing the TFT substrate 10 of the 7-type WXGA liquid crystal display panel 1
- FIGS. 15B and 15C show the TFT substrate shown in FIG. 1 is a plan view schematically showing a color filter substrate 20 facing 10.
- the TFT substrate 10 includes a TFT 11 provided in each pixel, a scanning wiring 12 that supplies a scanning signal to the TFT 11, and a signal wiring 13 that supplies a display signal to the TFT 11.
- pixel electrodes, contact holes, and the like are omitted.
- the color filter substrate 20 has a light shielding layer 23.
- the light shielding layer 23 is formed in a lattice shape so that a substantially rectangular opening is located in a region corresponding to each pixel.
- the width w of the portion of the light shielding layer 23 that overlaps the signal wiring 13 is 7 ⁇ m, and the row direction (scanning wiring 12) of the opening (region where the light shielding layer 23 is not formed).
- the width w ′ along the extending direction is 32 ⁇ m.
- the aperture ratio is about 58%.
- the width w of the portion of the light shielding layer 23 that overlaps the signal wiring 13 is 11 ⁇ m, and the width w ′ along the row direction of the opening is 28 ⁇ m.
- the aperture ratio is about 51%.
- the width w of the portion of the light shielding layer 23 that overlaps the signal wiring 13 is larger than that of the example of FIG. Therefore, the example of FIG. 15C has a higher effect of suppressing the occurrence of light leakage from adjacent pixels than the example of FIG.
- the aperture ratio is lower than that in the example shown in FIG. 15, but according to the embodiment of the present invention, the transmittance of the color filter layer 22 can be increased. Even if the area of the light shielding layer 23 is increased as in the example of FIG. 15C, the panel transmittance equal to or higher than that of the conventional one can be ensured.
- a wide viewing angle display mode for example, a lateral electric field mode such as an IPS mode or an FFS mode
- a lateral electric field mode such as an IPS mode or an FFS mode
- an allowable amount of bonding deviation between the TFT substrate 10 and the color filter substrate 20 is increased, so that an effect of improving the manufacturing yield can be obtained.
- pixel structure As the display mode of the liquid crystal display device 100 according to the embodiment of the present invention, various display modes can be used. Here, a specific pixel structure will be described by taking an FFS mode, which is a kind of lateral electric field mode, as an example.
- FIG. 16 to 18 show the pixel structure of the liquid crystal display device 100 in the FFS mode.
- FIG. 16 is a plan view schematically showing the liquid crystal display panel 1.
- FIGS. 17A and 17B are plan views schematically showing the TFT substrate 10 and the color filter substrate 20, respectively.
- 18A and 18B are cross-sectional views taken along the lines 18A-18A 'and 18B-18B' in FIG. 16, respectively.
- the TFT substrate 10 includes a TFT 11 provided in each pixel, a scanning wiring 12 that supplies a scanning signal to the TFT 11, and a signal wiring 13 that supplies a display signal to the TFT 11.
- the TFT substrate 10 further includes a pixel electrode 14 electrically connected to the TFT 11 and a common electrode 15 to which a common voltage is supplied.
- the TFT 11 includes a gate electrode 11g, a gate insulating layer (for example, SiNx layer) 16, a semiconductor layer 11a, a source electrode 11s, and a drain electrode 11d.
- the gate electrode 11g is electrically connected to the scanning wiring 12. Further, the source electrode 11 s is electrically connected to the signal wiring 13, and the drain electrode 11 d is electrically connected to the pixel electrode 14.
- the material of the semiconductor layer 11a of the TFT 11 various known semiconductor materials can be used.
- amorphous silicon, polycrystalline silicon, continuous grain boundary crystal silicon (CGS), or the like can be used.
- an oxide semiconductor such as an In—Ga—Zn—O-based semiconductor may be used.
- the scanning wiring 12 is described substantially parallel to the row direction.
- the signal wiring 13 extends substantially parallel to the column direction.
- the pixel electrode 14 has a plurality of elongated electrode portions 14a and a plurality of slits 14b.
- the numbers of the elongated electrode portions 14a and the slits 14b are not limited to those illustrated in FIG.
- the pixel electrode 14 is made of a transparent conductive material (for example, ITO or IZO).
- the common electrode 15 is provided below the pixel electrode 14 so as to overlap the pixel electrode 14 with a dielectric layer (for example, SiNx layer) 17 interposed therebetween.
- the common electrode 15 is made of a transparent conductive material (for example, ITO or IZO).
- the interlayer insulating layer 18 is formed so as to cover the TFT 11 and the signal wiring 13, and the common electrode 15 is formed on the interlayer insulating layer 18.
- the interlayer insulating layer 18 includes an inorganic insulating layer (for example, a SiNx layer) 18a and an organic insulating layer (for example, formed of a photosensitive resin) 18b.
- a contact hole CH is formed in the interlayer insulating layer 18. Within this contact hole CH, the pixel electrode 14 is connected to the drain electrode 11 d of the TFT 11.
- the above-described components of the TFT substrate 10 are supported by an insulating transparent substrate (for example, a glass substrate) 19.
- the color filter substrate 20 includes a color filter layer 22 (a red color filter 22R, a green color filter 22G, and a blue color filter 22B) and a light shielding layer (black matrix) 23.
- the red color filter 22R, the green color filter 22G, and the blue color filter 22B are provided in a region corresponding to the red pixel, a region corresponding to the green pixel, and a region corresponding to the blue pixel, respectively.
- the light shielding layer 23 is formed in a lattice shape so as to be positioned between adjacent pixels.
- a planarizing layer 24 is provided on the color filter layer 22.
- a plurality of columnar spacers 41 for defining the thickness (cell gap) of the liquid crystal layer 30 are formed on the planarizing layer 24.
- the plurality of columnar spacers 41 include a relatively high main spacer 41a and a relatively low sub-spacer 41b.
- the above-described components of the color filter substrate 20 are supported by a transparent substrate (for example, a glass substrate) 21 having an insulating property.
- a horizontal alignment film (not shown) is provided on the surface of each of the TFT substrate 10 and the color filter substrate 20 on the liquid crystal layer 30 side.
- a horizontal electric field (an oblique electric field) is generated using the pixel electrode 14 and the common electrode 15, and liquid crystal molecules are rotated in the substrate plane by the horizontal electric field.
- display is performed.
- FIG. 19 is a cross-sectional view schematically showing the illumination element 2.
- the illumination element 2 includes a light emitting element 51 that emits excitation light, a green phosphor 52 that absorbs excitation light emitted from the light emitting element 51 and emits green light, and an excitation emitted from the light emitting element 51.
- a red phosphor 53 that absorbs light and emits red light.
- the green phosphor 52 and the red phosphor 53 are sealed in a sealant 54, and absorb a part of the light emitted from the light emitting element 2 to emit light having a longer wavelength. Function as.
- the wavelength converter WC is at least selected from the following (A) ⁇ -type SiAlON divalent europium activated oxynitride phosphor and (B) divalent europium activated silicate phosphor as the green phosphor 52.
- the red phosphor 53 contains at least one selected from the following two types of (C) and (D) tetravalent manganese-activated fluorinated tetravalent metal salt phosphors.
- Eu represents europium
- Si represents silicon
- Al aluminum
- O oxygen
- N nitrogen.
- the value of a representing the composition ratio (concentration) of Eu is 0.005 ⁇ a ⁇ 0.4.
- concentration concentration
- the value of a in the above formula is preferably 0.01 ⁇ a ⁇ 0.2 from the viewpoint of the stability of the powder characteristics and the homogeneity of the matrix.
- Eu 0.05 Si 11.50 Al 0.50 O 0.05 N 15.95 , Eu 0.10 Si 11.00 Al 1.00 O 0.10 N 15.90 , Eu 0.30 Si 9.80 Al 2.20 O 0.30 N 15.70 , Eu 0.15 Si 10.00 Al 2.00 O 0.20 N 15.80 , Eu 0.01 Si 11.60 Al 0.40 O 0.01 N 15.99 , Eu 0.005 Si 11.70 Al 0.30 O 0.03 N 15.97, etc. can be mentioned, but of course not limited thereto.
- (B) Divalent europium activated silicate phosphor The divalent europium activated silicate phosphor suitably used as the green phosphor 52 is: Formula (B): 2 (Ba 1 -fg MI f Eu g) O ⁇ SiO 2 (Hereinafter, this divalent europium activated silicate phosphor is referred to as “second green phosphor”).
- this divalent europium activated silicate phosphor is referred to as “second green phosphor”.
- Ba barium
- Eu represents europium
- O oxygen
- Si silicon.
- MI represents at least one alkaline earth metal element selected from Mg, Ca and Sr
- MI is preferably Sr in order to obtain a highly efficient matrix.
- the value of f representing the composition ratio (concentration) of MI is 0 ⁇ f ⁇ 0.55, and the value of f is within this range, so that the green color in the range of 510 to 540 nm Luminescence can be obtained.
- the value of f exceeds 0.55, greenish light emission with yellowishness is caused, and color purity may be deteriorated.
- the value of f is preferably in the range of 0.15 ⁇ f ⁇ 0.45.
- the value of g indicating the composition ratio (concentration) of Eu is 0.03 ⁇ g ⁇ 0.10.
- concentration concentration
- the value of g is less than 0.03, sufficient brightness may not be obtained.
- the value of g exceeds 0.10, the brightness may be greatly reduced due to concentration quenching or the like.
- the value of g is preferably in the range of 0.04 ⁇ g ⁇ 0.08 in terms of brightness and stability of powder characteristics.
- (C) Tetravalent manganese-activated fluorinated tetravalent metal salt phosphor suitably used as the red phosphor 53 is: Formula (C): MII 2 (MIII 1-h Mn h ) F 6 (Hereinafter, this tetravalent manganese-activated fluorinated tetravalent metal salt phosphor is referred to as “first red phosphor”).
- Mn manganese
- F represents fluorine.
- MII represents at least one alkali metal element selected from Na, K, Rb, and Cs, and MII is preferably K in terms of brightness and stability of powder characteristics.
- MIII represents at least one tetravalent metal element selected from Ge, Si, Sn, Ti and Zr. From the viewpoint of brightness and stability of powder characteristics, MIII is Ti. Preferably there is.
- the value of h indicating the composition ratio (concentration) of Mn is 0.001 ⁇ h ⁇ 0.1.
- the value of h is less than 0.001, sufficient brightness may not be obtained.
- the value of h exceeds 0.1, the brightness may be greatly reduced due to concentration quenching or the like.
- the value of h is preferably 0.005 ⁇ h ⁇ 0.5.
- (D) Tetravalent manganese-activated fluorinated tetravalent metal salt phosphor suitably used as the red phosphor 53 is: Formula (D): MIV (MIII 1-h Mn h ) F 6 (Hereinafter, this tetravalent manganese-activated fluorinated tetravalent metal salt phosphor is referred to as “second red phosphor”).
- Mn manganese
- F fluorine
- MIII represents at least one tetravalent metal element selected from Ge, Si, Sn, Ti, and Zr as in MIII in general formula (C) described above, for the same reason. , MIII is preferably Ti.
- MIV represents at least one alkaline earth metal element selected from Mg, Ca, Sr, Ba and Zn, and MIV is Ca from the stability of brightness and powder characteristics. Preferably there is.
- the second red phosphor examples include Zn (Ti 0.98 Mn 0.02 ) F 6 , Ba (Zr 0.995 Mn 0.005 F 6 , Ca (Ti 0.995 Mn 0.005 ) F 6 , Sr (Zr 0.98 Mn 0.02 ).
- Examples include F 6, but of course not limited thereto.
- the mixing ratio of the green phosphor 52 and the red phosphor 53 is not particularly limited, but the green phosphor 52 may be mixed with the red phosphor 53 at a mixing ratio in the range of 5% to 70% by weight. Preferably, mixing is performed at a mixing ratio in the range of 15% to 45%.
- a gallium nitride (GaN) based semiconductor light emitting element that emits blue light having a peak wavelength of 430 nm or more and 480 nm or less (more preferably 440 nm or more and 480 nm or less) can be preferably used.
- GaN gallium nitride
- the contribution of the blue light component is reduced, and the color rendering may be deteriorated.
- the brightness of white may be lowered.
- the sealant 6 an epoxy resin, a silicone resin, a urea resin, or the like, which is a light-transmitting resin material, can be used, but is not limited thereto.
- the wavelength converter WC has additives such as SiO 2 , TiO 2 , ZrO 2 , Al 2 O 3 , and Y 2 O 3. May be appropriately contained.
- the green phosphor 52 and the red phosphor 53 are not limited to those described above.
- a green phosphor disclosed in JP 2008-303331 A or a red phosphor disclosed in JP 2010-93132 A may be used.
- the entire contents disclosed in Japanese Patent Application Laid-Open Nos. 2008-303331 and 2010-93132 are incorporated herein by reference.
- liquid crystal display device that is excellent in color reproducibility and can realize high panel transmittance.
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Abstract
Description
本実施形態では、液晶表示装置100の色仕様がsRGB規格に対応するように、照明素子2の発光スペクトルおよびカラーフィルタ層22の透過スペクトルが設定されている。
本実施形態では、液晶表示装置100の色仕様がAdobeRGB規格に対応するように、照明素子2の発光スペクトルおよびカラーフィルタ層の透過スペクトルが設定されている。以下、図8~図11を参照しながら、本実施形態における照明素子2の発光スペクトルおよびカラーフィルタ層22の透過スペクトルと、比較例2における照明素子の発光スペクトルおよびカラーフィルタ層の透過スペクトルとの差異を説明する。比較例2の液晶表示装置の照明素子は、光源として青黄色系疑似白色LEDを有しており、比較例2の液晶表示装置の赤カラーフィルタ、緑カラーフィルタおよび青カラーフィルタは、AdobeRGB規格に対応するように青黄色系疑似白色LEDに対して最適化された分光透過特性を有する。
本実施形態では、液晶表示装置100の色仕様がAdobeRGB規格に対応し、さらに、赤についてはDCI(Digital-Cinema-Initiatives)規格にも対応するように、照明素子2の発光スペクトルおよびカラーフィルタ層の透過スペクトルが設定されている。本実施形態の照明素子2の発光スペクトル、緑カラーフィルタ22Gの透過スペクトルおよび青カラーフィルタ22Bの透過スペクトルは、実施形態2と同じである。
本発明の実施形態による液晶表示装置100では、照明素子2の発光スペクトルと、カラーフィルタ層22の透過スペクトルとが、実施形態1~3で説明したように設定されており、そのことによって、優れた色再現性および高いパネル透過率が実現される。そのため、液晶表示装置100の高輝度化、低消費電力化を図ることができる。
隣接画素からの光漏れの発生をより確実に抑制するために、遮光層23の面積を大きくしてもよい。その場合、開口率が低下するが、本発明の実施形態によれば、カラーフィルタ層22の透過率を高くすることができるので、従来と同等以上のパネル透過率を確保することができる。以下、図15を参照しながら、より具体的に説明を行う。
本発明の実施形態による液晶表示装置100の表示モードとしては、種々の表示モードを用いることができる。ここで、横電界モードの一種であるFFSモードを例として、具体的な画素構造を説明する。
図2、図4および図8に示したスペクトルの光を発する照明素子2としては、例えば、国際公開第2009/110285号に開示されているバックライトを用いることができる。参考のために、国際公開第2009/110285号の開示内容の全てを本明細書に援用する。以下、図19を参照しながら、照明素子2の具体的な構成の例を説明する。図19は、照明素子2を模式的に示す断面図である。
緑色蛍光体52として好適に用いられる2価のユーロピウム付活酸窒化物緑色蛍光体は、
一般式(A):EuaSibAlcOdNe
で実質的に表される(以下、この2価のユーロピウム付活酸窒化物緑色蛍光体を「第1の緑色蛍光体」と称する。)。一般式(A)において、Euはユーロピウム、Siはケイ素、Alはアルミニウム、Oは酸素、Nは窒素を表している。
緑色蛍光体52として好適に用いられる2価のユーロピウム付活珪酸塩蛍光体は、
一般式(B):2(Ba1-f-gMIfEug)O・SiO2
で実質的に表される(以下、この2価のユーロピウム付活珪酸塩蛍光体を「第2の緑色蛍光体」と称する。)。一般式(B)において、Baはバリウム、Euはユーロピウム、Oは酸素、Siはケイ素を表している。一般式(B)中、MIは、Mg、CaおよびSrから選ばれる少なくとも1種のアルカリ土類金属元素を示し、高効率な母体を得るためには、MIはSrであることが好ましい。
赤色蛍光体53として好適に用いられる4価のマンガン付活フッ化4価金属塩蛍光体は、
一般式(C):MII2(MIII1-hMnh)F6
で実質的に表される(以下、この4価のマンガン付活フッ化4価金属塩蛍光体を「第1の赤色蛍光体」と称する。)。なお、一般式(C)において、Mnはマンガン、Fはフッ素を表している。一般式(C)中、MIIは、Na、K、RbおよびCsから選ばれる少なくとも1種のアルカリ金属元素を示し、明るさおよび粉体特性の安定性から、MIIはKであることが好ましい。また一般式(C)中、MIIIは、Ge、Si、Sn、TiおよびZrから選ばれる少なくとも1種の4価の金属元素を示し、明るさおよび粉体特性の安定性から、MIIIはTiであることが好ましい。
赤色蛍光体53として好適に用いられる4価のマンガン付活フッ化4価金属塩蛍光体は、
一般式(D):MIV(MIII1-hMnh)F6
で実質的に表される(以下、この4価のマンガン付活フッ化4価金属塩蛍光体を「第2の赤色蛍光体」と称する。)。なお、一般式(D)において、Mnはマンガン、Fはフッ素を表している。一般式(D)中、MIIIは、上述した一般式(C)中のMIIIと同じくGe、Si、Sn、TiおよびZrから選ばれる少なくとも1種の4価の金属元素を示し、同様の理由から、MIIIはTiであることが好ましい。また一般式(D)中、MIVは、Mg、Ca、Sr、BaおよびZnから選ばれる少なくとも1種のアルカリ土類金属元素を示し、明るさおよび粉体特性の安定性から、MIVはCaであることが好ましい。
2 照明素子
10 アクティブマトリクス基板(TFT基板)
20 カラーフィルタ基板(対向基板)
22 カラーフィルタ層
22R 赤カラーフィルタ
22G 緑カラーフィルタ
22B 青カラーフィルタ
23 遮光層(ブラックマトリクス)
24 平坦化層
51 発光素子
52 緑色蛍光体
53 赤色蛍光体
100 液晶表示装置
Claims (7)
- 赤カラーフィルタ、緑カラーフィルタおよび青カラーフィルタを有する液晶表示パネルと、
前記液晶表示パネルに光を照射する照明素子と、
を備えた液晶表示装置であって、
前記照明素子が発する光のスペクトルは、447nm以上453nm以下、538nm以上542nm以下、613nm以上617nm以下、628nm以上632nm以下および648nm以上652nm以下の波長範囲のそれぞれ内にピークを有し、
前記赤カラーフィルタの透過スペクトルのピーク波長および立ち上がり波長は、それぞれ600nm以上および568nm以上572nm以下であり、
前記赤カラーフィルタの透過スペクトルは、波長400nm、420nmおよび580nmにおいてそれぞれ10%以上15%以下、3%以上6%以下および25%以上30%以下の透過率を示し、
前記赤カラーフィルタの透過スペクトルが50%の透過率を示す波長は、583nm以上587nm以下の範囲内に含まれており、
前記緑カラーフィルタの透過スペクトルのピーク波長は、500nm以上560nm以下であり、
前記緑カラーフィルタの透過スペクトルは、波長480nmおよび580nmにおいてそれぞれ45%以上55%以下および65%以上70%以下の透過率を示し、
前記緑カラーフィルタの透過スペクトルが50%の透過率を示す波長は、478nm以上482nm以下および590nm以上600nm以下の範囲のそれぞれ内に含まれており、
前記青カラーフィルタの透過スペクトルのピーク波長は、440nm以上470nm以下であり、
前記青カラーフィルタの透過スペクトルは、波長400nmおよび500nmにおいてそれぞれ25%以上40%以下および40%以上50%以下の透過率を示し、
前記青カラーフィルタの透過スペクトルが50%の透過率を示す波長は、493nm以上503nm以下の範囲内に含まれている、液晶表示装置。 - 赤カラーフィルタ、緑カラーフィルタおよび青カラーフィルタを有する液晶表示パネルと、
前記液晶表示パネルに光を照射する照明素子と、
を備えた液晶表示装置であって、
前記照明素子が発する光のスペクトルは、447nm以上453nm以下、528nm以上532nm以下、613nm以上617nm以下、628nm以上632nm以下および648nm以上652nm以下の波長範囲のそれぞれ内にピークを有し、
前記赤カラーフィルタの透過スペクトルのピーク波長および立ち上がり波長は、それぞれ600nm以上および568nm以上572nm以下であり、
前記赤カラーフィルタの透過スペクトルは、波長400nm、420nmおよび580nmにおいてそれぞれ10%以上15%以下、3%以上6%以下および25%以上30%以下の透過率を示し、
前記赤カラーフィルタの透過スペクトルが50%の透過率を示す波長は、583nm以上587nm以下の範囲内に含まれており、
前記緑カラーフィルタの透過スペクトルのピーク波長は、520nm以上540nm以下であり、
前記緑カラーフィルタの透過スペクトルは、波長480nmおよび560nmにおいてそれぞれ15%以上20%以下および20%以上30%以下の透過率を示し、
前記緑カラーフィルタの透過スペクトルが50%の透過率を示す波長は、498nm以上502nm以下および540nm以上550nm以下の範囲のそれぞれ内に含まれており、
前記青カラーフィルタの透過スペクトルのピーク波長は、465nm以上475nm以下であり、
前記青カラーフィルタの透過スペクトルは、波長400nmおよび500nmにおいてそれぞれ20%以上25%以下の透過率を示し、且つ、前記ピーク波長において40%以下の透過率を示す、液晶表示装置。 - 赤カラーフィルタ、緑カラーフィルタおよび青カラーフィルタを有する液晶表示パネルと、
前記液晶表示パネルに光を照射する照明素子と、
を備えた液晶表示装置であって、
前記照明素子が発する光のスペクトルは、447nm以上453nm以下、528nm以上532nm以下、613nm以上617nm以下、628nm以上632nm以下および648nm以上652nm以下の波長範囲のそれぞれ内にピークを有し、
前記赤カラーフィルタの透過スペクトルのピーク波長および立ち上がり波長は、それぞれ600nm以上および573nm以上577nm以下であり、
前記赤カラーフィルタの透過スペクトルは、400nm以上560nm以下の波長範囲内で、5%以下の透過率を示し、
前記赤カラーフィルタの透過スペクトルが50%の透過率を示す波長は、590nm以上595nm以下の範囲内に含まれており、
前記緑カラーフィルタの透過スペクトルのピーク波長は、520nm以上540nm以下であり、
前記緑カラーフィルタの透過スペクトルは、波長480nmおよび560nmにおいてそれぞれ15%以上20%以下および20%以上30%以下の透過率を示し、
前記緑カラーフィルタの透過スペクトルが50%の透過率を示す波長は、498nm以上502nm以下および540nm以上550nm以下の範囲のそれぞれ内に含まれており、
前記青カラーフィルタの透過スペクトルのピーク波長は、465nm以上475nm以下であり、
前記青カラーフィルタの透過スペクトルは、波長400nmおよび500nmにおいてそれぞれ20%以上25%以下の透過率を示し、且つ、前記ピーク波長において40%以下の透過率を示す、液晶表示装置。 - 前記赤カラーフィルタ、前記緑カラーフィルタおよび前記青カラーフィルタのそれぞれの厚さは、1.5μm以下である請求項1から3のいずれかに記載の液晶表示装置。
- 前記液晶表示パネルは、前記赤カラーフィルタ、前記緑カラーフィルタおよび前記青カラーフィルタを有するカラーフィルタ基板を含み、
前記カラーフィルタ基板は、前記赤カラーフィルタ、前記緑カラーフィルタおよび前記青カラーフィルタを覆うように形成された平坦化層をさらに有する請求項1から4のいずれかに記載の液晶表示装置。 - 横電界モードで表示を行う、請求項1から5のいずれかに記載の液晶表示装置。
- 前記照明素子は、励起光を発する発光素子と、前記発光素子から発せられる励起光を吸収して緑色光を発する緑色蛍光体と、前記発光素子から発せられる励起光を吸収して赤色光を発する赤色蛍光体と、を有する請求項1から6のいずれかに記載の液晶表示装置。
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| US14/913,413 US10268078B2 (en) | 2013-08-23 | 2014-08-08 | Liquid crystal display |
| CN201480046290.1A CN105474081B (zh) | 2013-08-23 | 2014-08-08 | 液晶显示装置 |
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| JP2013-173212 | 2013-08-23 | ||
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| CN117037730A (zh) * | 2023-07-27 | 2023-11-10 | 深圳汉王友基科技有限公司 | 一种兼容DCI-P3和AdobeRGB的显示设备 |
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| JP6538271B2 (ja) * | 2016-04-14 | 2019-07-03 | シャープ株式会社 | 表示装置およびその製造方法 |
| US10353243B2 (en) * | 2017-08-01 | 2019-07-16 | Innolux Corporation | Display device |
| CN108508649B (zh) * | 2018-03-30 | 2021-11-26 | 上海中航光电子有限公司 | 液晶显示装置的色度调节方法、液晶显示装置和终端设备 |
| KR102158811B1 (ko) * | 2018-07-03 | 2020-09-22 | 주식회사 엘엠에스 | 지문인식센서용 광학원판 및 이를 포함하는 광학필터 |
| JP7354669B2 (ja) * | 2018-08-31 | 2023-10-03 | Dic株式会社 | 表示装置 |
| CN119208311A (zh) | 2019-03-18 | 2024-12-27 | 英特曼帝克司公司 | Led灯丝 |
| US10468564B1 (en) * | 2019-03-18 | 2019-11-05 | Intematix Corporation | Packaged white light emitting device comprising photoluminescence layered structure |
| WO2020190914A1 (en) | 2019-03-18 | 2020-09-24 | Intematix Corporation | Packaged white light emitting device comprising photoluminescence layered structure |
| US11781714B2 (en) | 2019-03-18 | 2023-10-10 | Bridgelux, Inc. | LED-filaments and LED-filament lamps |
| US11342311B2 (en) | 2019-03-18 | 2022-05-24 | Intematix Corporation | LED-filaments and LED-filament lamps utilizing manganese-activated fluoride red photoluminescence material |
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| US20160202555A1 (en) | 2016-07-14 |
| CN105474081B (zh) | 2018-09-28 |
| CN105474081A (zh) | 2016-04-06 |
| US10268078B2 (en) | 2019-04-23 |
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