CN113823757A - Display panel and display device - Google Patents
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- CN113823757A CN113823757A CN202111110643.8A CN202111110643A CN113823757A CN 113823757 A CN113823757 A CN 113823757A CN 202111110643 A CN202111110643 A CN 202111110643A CN 113823757 A CN113823757 A CN 113823757A
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
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Abstract
The disclosure provides a display panel and a display device. The display panel includes: a substrate base plate; the light emitting layer is arranged on the substrate and comprises a plurality of sub-pixels, the plurality of sub-pixels comprise first sub-pixels, and emergent light of the first sub-pixels comprises at least one monochromatic light; the emergent light wave bands of the first sub-pixels have a first wave band and a second wave band which are continuous, the emergent light with the wavelength positioned in the first wave band is first emergent light, the emergent light with the wavelength positioned in the second wave band is second emergent light, and the intensity of the first emergent light is greater than that of the second emergent light; the dimming layer is arranged on the light emitting side of the sub-pixel and can transmit light; and the light transmittance of the light modulation layer to the first emergent light is more than or equal to that of the light modulation layer to the second emergent light. The present disclosure can improve the gamut range.
Description
Technical Field
The present disclosure relates to the field of display technologies, and in particular, to a display panel and a display device.
Background
An OLED (Organic Light Emitting Diode) display device has a series of advantages such as an all-solid structure, self-luminescence, fast response speed, high brightness, a full viewing angle, and flexible display, and thus becomes a display device with high competitiveness and good development prospect. However, this display device has a problem of a small color gamut range.
Disclosure of Invention
An object of the present disclosure is to provide a display panel and a display device capable of improving a color gamut range.
According to an aspect of the present disclosure, there is provided a display panel including:
a substrate base plate;
the light emitting layer is arranged on the substrate and comprises a plurality of sub-pixels, the plurality of sub-pixels comprise first sub-pixels, and emergent light of the first sub-pixels comprises at least one monochromatic light; the emergent light wave bands of the first sub-pixels have a first wave band and a second wave band which are continuous, the emergent light with the wavelength positioned in the first wave band is first emergent light, the emergent light with the wavelength positioned in the second wave band is second emergent light, and the intensity of the first emergent light is greater than that of the second emergent light;
the dimming layer is arranged on the light emitting side of the sub-pixel and can transmit light; and the light transmittance of the light modulation layer to the first emergent light is more than or equal to that of the light modulation layer to the second emergent light.
Further, the wavelength corresponding to the maximum intensity of the emergent light is smaller than the minimum wavelength of the second wave band.
Further, the maximum wavelength of the second wavelength band is equal to the maximum wavelength of the emergent light wavelength band.
Further, an absolute value of a difference between the minimum wavelength of the second wavelength band and the maximum wavelength of the second wavelength band is less than or equal to half of an absolute value of a difference between a wavelength corresponding to the maximum intensity of the outgoing light and the maximum wavelength of the second wavelength band.
Further, the minimum wavelength of the first wavelength band is equal to or greater than the wavelength corresponding to the maximum intensity of the outgoing light.
Further, the minimum wavelength of the first wavelength band is smaller than the wavelength corresponding to the maximum intensity of the outgoing light, and the absolute value of the difference between the wavelength corresponding to the maximum intensity of the outgoing light and the minimum wavelength of the first wavelength band is smaller than the absolute value of the difference between the wavelength corresponding to the maximum intensity of the outgoing light and the maximum wavelength of the first wavelength band.
Further, the wavelength corresponding to the maximum intensity of the emergent light is larger than the maximum wavelength of the second wave band.
Further, the minimum wavelength of the second wavelength band is equal to the minimum wavelength of the outgoing light wavelength band.
Further, an absolute value of a difference between the maximum wavelength of the second wavelength band and the minimum wavelength of the second wavelength band is less than or equal to half of an absolute value of a difference between a wavelength corresponding to the maximum intensity of the outgoing light and the minimum wavelength of the second wavelength band.
Further, the maximum wavelength of the first wavelength band is less than or equal to the wavelength corresponding to the maximum intensity of the emergent light.
Further, the maximum wavelength of the first wavelength band is greater than the wavelength corresponding to the maximum intensity of the outgoing light, and the absolute value of the difference between the wavelength corresponding to the maximum intensity of the outgoing light and the maximum wavelength of the first wavelength band is smaller than the absolute value of the difference between the wavelength corresponding to the maximum intensity of the outgoing light and the minimum wavelength of the first wavelength band.
Further, from the minimum wavelength of the second wavelength band to the maximum wavelength of the second wavelength band, the intensity of the emergent light of the sub-pixel is gradually increased, and the light transmittance of the light modulation layer is gradually increased; or
From the minimum wavelength of the second wave band to the maximum wavelength of the second wave band, the intensity of emergent light of the sub-pixel is gradually reduced, and the light transmittance of the light modulation layer is gradually reduced.
Further, the sub-pixel includes:
the first electrode is arranged on the substrate base plate;
the light-emitting material layer is arranged on one side, back to the substrate, of the first electrode;
the second electrode is arranged on one side, back to the first electrode, of the luminescent material layer;
one of the first electrode and the second electrode is a reflecting electrode, and the other one of the first electrode and the second electrode is a semi-transparent semi-reflecting electrode.
Further, the plurality of sub-pixels include a second sub-pixel, monochromatic light generated by the first sub-pixel is different from monochromatic light generated by the second sub-pixel, and a distance between the first electrode and the second electrode of the first sub-pixel is different from a distance between the first electrode and the second electrode of the second sub-pixel.
Further, one side of the sub-pixel facing away from the substrate is a light emitting side of the sub-pixel, and the display panel further includes:
the packaging layer is arranged on one side, back to the substrate, of the light-emitting layer;
the light adjusting layer is arranged on one side, back to the substrate base plate, of the packaging layer, or the light adjusting layer is arranged between the packaging layer and the light emitting layer.
Further, the material of the light modulation layer includes a derivative of a boron-fluorine dipyrrole dye or copper phthalocyanine.
Furthermore, the first sub-pixel is a green sub-pixel, and the wavelength corresponding to the maximum intensity of emergent light of the green sub-pixel is 510nm-530 nm.
Further, the first sub-pixel is a green sub-pixel, and the light transmission wavelength band of the light modulation layer is 460nm-610 nm; or
The first sub-pixel is a red sub-pixel, and the light-transmitting wave band of the light modulation layer is greater than or equal to 595 nm.
According to an aspect of the present disclosure, a display device is provided, which includes the display panel described above.
According to the display panel and the display device, the light emitting side of the sub-pixel is provided with the dimming layer, so that the intensity of emergent light of the first sub-pixel is reduced after passing through the dimming layer, namely that the spectral curve of the emergent light moves towards the transverse axis of a coordinate system; for the first emergent light and the second emergent light with different intensities, the light transmittance of the dimming layer to the first emergent light with larger intensity is more than or equal to that of the dimming layer to the second emergent light with smaller intensity, so that the intensity of the first emergent light after passing through the dimming layer is still more than that of the second emergent light after passing through the dimming layer, which is equivalent to the unchanged variation trend of the emergent light spectrum curve, and the emergent light spectrum curve is narrowed because the emergent light spectrum curve moves towards the transverse axis of the coordinate system, the color gamut of the display panel is improved, and the display effect of the display panel is improved.
Drawings
Fig. 1 is a graph of an outgoing light spectrum of a sub-pixel of a display panel in the related art.
Fig. 2 is a schematic view of a color gamut range of a display panel in the related art.
Fig. 3 is a schematic diagram of a display panel of an embodiment of the present disclosure.
Fig. 4 is another schematic diagram of a display panel of an embodiment of the present disclosure.
Fig. 5 is a transmission spectrum curve of a dimming layer of a display panel of the embodiment of the present disclosure.
Fig. 6 is an outgoing light spectrum curve of the display panel of the embodiment of the present disclosure.
Fig. 7 is a color gamut range schematic diagram of a display panel of an embodiment of the present disclosure.
Fig. 8 is an emission light spectrum curve of a green subpixel of the display panel of the embodiment of the present disclosure.
Fig. 9 is an outgoing light spectrum curve of a red subpixel of the display panel of the embodiment of the present disclosure.
Fig. 10 is another color gamut range schematic diagram of the display panel of the embodiment of the present disclosure.
Fig. 11 is a light transmission spectrum curve of the first light modulation region of the light modulation layer of the embodiment of the present disclosure.
Fig. 12 is a light transmission spectrum curve of the second light modulation region of the light modulation layer of the embodiment of the present disclosure.
Fig. 13 is a schematic view of still another color gamut range of the display panel of the embodiment of the present disclosure.
Fig. 14 is an outgoing light spectrum curve of the red sub-pixel and a transmission spectrum curve of the first dimming region according to the embodiment of the present disclosure.
Fig. 15 is a spectrum curve of the emitted light of the red sub-pixel after adjustment according to the embodiment of the present disclosure.
Fig. 16 is a schematic view of another color gamut range of the display panel according to the embodiment of the disclosure.
Description of reference numerals: 1. a substrate base plate; 101. a substrate; 102. a driving circuit layer; 2. a sub-pixel; 201. a first electrode; 202. a hole transport layer; 203. a light emitting material layer; 204. an electron transport layer; 205. a second electrode; 2001. a first sub-pixel; 2002. a second sub-pixel; 2003. a third sub-pixel; 3. a pixel defining layer; 4. a packaging layer; 5. a dimming layer; 501. a first dimming area; 502. a second dimming area; 503. and a third dimming area.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Rather, they are merely examples of devices consistent with certain aspects of the present disclosure, as detailed in the appended claims.
The terminology used in the present disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of "first," "second," and similar terms in the description and claims does not indicate any order, quantity, or importance, but rather is used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. "plurality" or "a number" means two or more. The word "comprising" or "comprises", and the like, means that the element or item listed as preceding "comprising" or "includes" covers the element or item listed as following "comprising" or "includes" and its equivalents, and does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. As used in this disclosure and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
In the related art, high color gamut means that the color gamut range which can be displayed by a screen is wide, and the color is richer and brighter. A High-Dynamic Range (HDR) image can provide more Dynamic Range and image details than a general image. The final HDR image is synthesized from LDR (Low-Dynamic Range) images of different exposure times and with the LDR image corresponding to the best detail for each exposure time, which better reflects the visual effect in the real environment. For better rendering of the display effect of HDR, a higher gamut range is required. FIG. 1 shows a graph of spectrum of light emitted from a display panel in the related art, where a graph S1 corresponds to red light, a graph S2 corresponds to green light, and the graphS3 corresponds to blue light, and the intensity of the light on the Y axis in FIG. 1 is given in Watts per square meter, nanometers, and steradians (W/m)2Nm sr). Fig. 2 shows a schematic diagram of the color gamut of a display panel in the related art, wherein L1 corresponds to the color gamut standard bt.2020, L2 corresponds to the color gamut standard NTSC @1931, and L3 corresponds to the color gamut of the display panel. As can be seen from fig. 1 and 2, the spectral range of the display panel in the related art is wide, and it is difficult to achieve a high color gamut. The color gamut standard BT.2020 is called ITU-R Recommendation BT.2020, is an image signal color gamut standard positioned by ITU in the 4K/8K era, and is one of the standards of ultra-high definition blue light. The standard has a wider color space, and is a standard used in HDR, and R, G, B color coordinates of the color space are (0.708,0.292), (0.170,0.797), and (0.131,0.046), respectively. In fig. 2, R, G, B has color coordinates of (0.680,0.319), (0.260,0.709), (0.140,0.047), and its color gamut ranges are NTSC @ 1931101% and BT 202076%.
The disclosed embodiments provide a display panel. As shown in fig. 3 and 4, the display panel may include a substrate base plate 1, a light emitting layer, and a dimming layer 5, wherein:
the light-emitting layer is provided on the base substrate 1. The light emitting layer includes a plurality of sub-pixels 2. The plurality of subpixels 2 includes a first subpixel 2001. The light emitted from the first subpixel 2001 includes at least one monochromatic light. The first sub-pixel 2001 has a first wavelength band and a second wavelength band in succession in the wavelength band of the emergent light, the emergent light with the wavelength in the first wavelength band is first emergent light, the emergent light with the wavelength in the second wavelength band is second emergent light, and the intensity of the first emergent light is greater than that of the second emergent light. The light modulation layer 5 is provided on the light exit side of the sub-pixel 2 and can transmit light. The light transmittance of the light adjusting layer 5 to the first outgoing light is greater than or equal to the light transmittance of the light adjusting layer 5 to the second outgoing light.
In the display panel of the embodiment, the light emitting side of the sub-pixel 2 is provided with the light modulation layer 5, so that the intensity of the emergent light of the first sub-pixel 2001 is reduced after passing through the light modulation layer 5, which is equivalent to that the spectral curve of the emergent light moves towards the horizontal axis (X axis) of the coordinate system; for the first emergent light and the second emergent light with different intensities, the light transmittance of the dimming layer 5 to the first emergent light with larger intensity is larger than or equal to the light transmittance of the dimming layer 5 to the second emergent light with smaller intensity, so that the intensity of the first emergent light after passing through the dimming layer 5 is still larger than the intensity of the second emergent light after passing through the dimming layer 5, which is equivalent to the unchanged variation trend of the spectrum curve of the emergent light, and the spectrum curve of the emergent light is narrowed because the spectrum curve of the emergent light moves towards the cross shaft of the coordinate system, the color gamut of the display panel is improved, and the display effect of the display panel is improved.
The following describes each part of the display panel according to the embodiment of the present disclosure in detail:
as shown in fig. 3, the substrate board 1 may include a substrate 101 and a driving circuit layer 102. The substrate 101 may be a rigid substrate. The rigid substrate may be a glass substrate or a PMMA (Polymethyl methacrylate) substrate. Of course, the substrate 101 may also be a flexible substrate. The flexible substrate may be a PET (Polyethylene terephthalate) substrate, a PEN (Polyethylene naphthalate) substrate, or a PI (Polyimide) substrate.
The driving circuit layer 102 may be provided on the substrate 101. The driving circuit layer 102 may include a plurality of driving transistors. The driving transistor may be a thin film transistor, but the disclosed embodiments are not limited thereto. The thin film transistor may be a top gate thin film transistor, and of course, the thin film transistor may also be a bottom gate thin film transistor. Taking a thin film transistor as an example of a top gate thin film transistor, the driving circuit layer 102 may include an active layer, a gate insulating layer, a gate electrode, an interlayer insulating layer, a source electrode, and a drain electrode. The active layer may be provided on the substrate 101. The gate insulating layer may be provided on the substrate 101 and cover the active layer. The gate electrode may be provided on a side of the gate insulating layer remote from the substrate 101. The interlayer insulating layer may be disposed on the gate insulating layer and cover the gate electrode. The source and drain electrodes may be provided on the interlayer insulating layer and connected to the active layer via a via hole passing through the interlayer insulating layer and the gate insulating layer. In addition, the driving back plate may further include a planarization layer. The planarization layer may be disposed on a surface of the driving circuit layer 102 facing away from the substrate 101, and cover the source and the drain of the driving transistor.
The light-emitting layer is provided on the base substrate 1. The light emitting layer may be provided on a planarization layer of the base substrate 1. The light emitting layer may include a plurality of pixels distributed in an array. Each pixel may include a plurality of sub-pixels 2. The display panel may further comprise a pixel defining layer 3 surrounding each sub-pixel 2. The sub-pixel 2 may include a first electrode 201, a light emitting material layer 203, and a second electrode 205. The first electrode 201 may be disposed on a side of the planarization layer opposite to the substrate 101. The first electrode 201 may be an anode, but may be a cathode. The luminescent material layer 203 may be disposed on a side of the first electrode 201 facing away from the substrate base plate 1. The second electrode 205 may be disposed on a side of the light emitting material layer 203 facing away from the first electrode 201. Taking the first electrode 201 as an anode, the second electrode 205 can be a cathode; taking the first electrode 201 as a cathode, the second electrode 205 may be an anode. The sub-pixel 2 may further include a hole transport layer 202 and a hole injection layer. The hole transport layer 202 may be located between the anode and the light emitting material layer 203, and the hole injection layer may be located between the anode and the hole transport layer 202. The sub-pixel 2 may further include an electron injection layer and an electron transport layer 204. The electron transport layer 204 may be located between the cathode and the luminescent material layer 203, and the electron injection layer may be located between the cathode and the electron transport layer 204. In addition, one of the first electrode 201 and the second electrode 205 is a reflective electrode, and the other is a transflective electrode, so that a microcavity structure is formed between the first electrode 201 and the second electrode 205. For example, the first electrode 201 is a reflective electrode, and the second electrode 205 is a transflective electrode. The side of the second electrode 205 away from the substrate 1 may be the light-emitting side of the sub-pixel 2. The display panel of the present disclosure may further include an encapsulation layer 4. The encapsulation layer 4 may be provided on the side of the light-emitting layer facing away from the substrate 1. The encapsulation layer 4 may be a thin film encapsulation layer (TFE), but the disclosure is not limited thereto.
The emitting light of the sub-pixel 2 may only include a single color light, that is, the emitting light of the sub-pixels 2 has the same color, for example, each of the sub-pixels 2 is a red sub-pixel, a green sub-pixel, or a blue sub-pixel. The red sub-pixel can emit red light, the green sub-pixel can emit green light, and the blue sub-pixel can emit blue light, i.e. the monochromatic light can be red light, green light or blue light. In other embodiments of the present disclosure, the light emitted from the sub-pixel 2 may include a plurality of monochromatic lights, that is, the emitted light from the plurality of sub-pixels 2 are different in color, for example, the plurality of sub-pixels 2 include a first sub-pixel 2001, a second sub-pixel 2002 and a third sub-pixel 2003, the first sub-pixel 2001 is selected from any one of a red sub-pixel, a green sub-pixel and a blue sub-pixel, the second sub-pixel 2002 is selected from any one of a red sub-pixel, a green sub-pixel and a blue sub-pixel, and the third sub-pixel 2003 is selected from any one of a red sub-pixel, a green sub-pixel and a blue sub-pixel.
The distance between the first electrode 201 and the second electrode 205 of the first subpixel 2001 is different from the distance between the first electrode 201 and the second electrode 205 of the second subpixel 2002, that is, the microcavity length of the first subpixel 2001 is different from the microcavity length of the second subpixel 2002. The micro-cavity length of the third sub-pixel 2003 is also different from the micro-cavity length of the first sub-pixel 2001 or the second sub-pixel 2002. Taking the first sub-pixel as a green sub-pixel as an example, the wavelength corresponding to the maximum intensity of the emergent light of the green sub-pixel may be 510nm to 530 nm.
The light modulation layer 5 is provided on the light emitting side of the sub-pixel 2. The light modulating layer 5 may be provided on a side of the second electrode 205 remote from the substrate 1. Taking the display panel including the encapsulation layer 4 as an example, as shown in fig. 3, the light modulation layer 5 may be disposed on a side of the encapsulation layer 4 opposite to the substrate 1, or, as shown in fig. 4, the light modulation layer 5 may be disposed between the encapsulation layer 4 and the second electrode 205. The dimming layer 5 is capable of transmitting light. The light adjusting layer 5 has a light transmitting band, and light having a wavelength within the light transmitting band can pass through the light adjusting layer 5. Fig. 5 shows a transmission spectrum curve of the light-adjusting layer 5, curve K1 corresponding to red light, curve K2 corresponding to green light, and curve K3 corresponding to blue light. For red light, the light transmission waveband of the light adjusting layer 5 is greater than or equal to 580nm, that is, the red light with the wavelength greater than or equal to 580nm can transmit through the light adjusting layer 5; for green light, the light-transmitting wavelength band of the light-adjusting layer 5 is 480nm-630nm, that is, green light with a wavelength between 480nm and 630nm can transmit through the light-adjusting layer 5; for blue light, the light transmission band of the light adjusting layer 5 is 380nm-530nm, that is, blue light with a wavelength between 380nm and 530nm can transmit through the light adjusting layer 5. The ordinate in fig. 4 may be the light transmittance. The light transmittance is equal to the ratio of the intensity of light after passing through the dimming layer 5 to the intensity of light incident to the dimming layer 5. Wherein, the light with any wavelength has corresponding light transmittance. When the light transmittance is equal to 0, it means that light cannot pass through the light modulation layer 5.
For a monochromatic light, the light transmission waveband of the light adjusting layer 5 and the emergent light waveband of the sub-pixel 2 have a coincident waveband. For red light, a light-transmitting waveband of the dimming layer 5 and an emergent light waveband of the red sub-pixel have a coincident waveband; for green light, a light-transmitting waveband of the dimming layer 5 and an emergent light waveband of the green sub-pixel have a coincident waveband; for blue light, a light transmission waveband of the dimming layer 5 and an emergent light waveband of the blue sub-pixel have a coincident waveband. The emergent light wave band of the sub-pixel 2 can be in the range of the light-transmitting wave band of the light modulation layer 5, that is, the minimum value of the emergent light wave band is greater than or equal to the minimum value of the light-transmitting wave band, and the maximum value of the emergent light wave band is less than or equal to the maximum value of the light-transmitting wave band. In other embodiments of the present disclosure, the wavelength band of the outgoing light of the sub-pixel 2 partially coincides with the transmission wavelength band of the light modulation layer 5.
As shown in fig. 1 and 5, the wavelength band of the outgoing light of the red sub-pixel is 584nm-706nm, and the overlapping wavelength band is 584nm-706 nm; taking the emergent light wave band of the green sub-pixel as 500nm-610nm as an example, the coincident wave band is 500nm-610 nm; taking the outgoing light wave band of the blue sub-pixel as 428nm-520nm as an example, the superposition wave band is 428nm-520 nm; the spectral curve of the outgoing light after passing through the light modulation layer 5 is shown in fig. 6. In fig. 6, the solid line is a spectrum curve of the outgoing light entering the light control layer 5, and the dotted line is a spectrum curve of the outgoing light after passing through the light control layer 5, and it is understood from fig. 6 that the intensity of the outgoing light is reduced after passing through the light control layer 5, so that the spectrum curve moves toward the horizontal axis of the coordinate system. In fig. 6, the emission light band of the sub-pixel 2 includes a first band F1 and a second band F2 which are continuous, the emission light with a wavelength in the first band F1 is the first emission light, the emission light with a wavelength in the second band F2 is the second emission light, and the intensity of the first emission light is greater than that of the second emission light. This luminousness of layer 5 of adjusting luminance to the great first emergent light of intensity more than or equal to the luminousness of layer 5 of adjusting luminance to the less second emergent light of intensity for the intensity of first emergent light after layer 5 of adjusting luminance is still greater than the intensity of second emergent light after layer 5 of adjusting luminance, and the trend of change that is equivalent to the spectral curve is unchangeable, and because the spectral curve moves to the cross axle of coordinate system, leads to the spectral curve to narrow down, has improved display panel's colour gamut, has promoted display panel's display effect. Fig. 7 shows a schematic diagram of the color gamut range of the display panel of the present disclosure, and the meanings of L1, L2, and L3 in fig. 7 are the same as those of L1, L2, and L3 in fig. 2. In fig. 7, R, G, B has color coordinates of (0.685,0.314), (0.221,0.747), (0.142,0.038), and the color gamut of the OLED screen is NTSC @ 1931114% and BT 202086%. The color gamut range of the present disclosure is improved compared to the display panel in the related art.
In one embodiment of the present disclosure, as shown in fig. 8, the wavelength corresponding to the maximum intensity of the outgoing light is smaller than the minimum wavelength of the second wavelength band E2, and both the intensity of the outgoing light and the transmittance of the light modulation layer 5 gradually decrease from the minimum wavelength of the second wavelength band E2 to the maximum wavelength of the second wavelength band E2. The wavelength corresponding to the maximum intensity of the emergent light is equal to the wavelength corresponding to the wave crest of the spectrum curve of the emergent light. When the wavelength is the minimum wavelength of the second waveband E2, the emergent light intensity of the sub-pixel 2 is theta1The light transmittance of the light adjusting layer 5 is w1(ii) a When the wavelength is the maximum wavelength of the second waveband E2, the intensity of the emergent light of the sub-pixel 2 is theta2The light transmittance of the light adjusting layer 5 is w2(ii) a Wherein, theta1>θ2，1>w1>w2. After the outgoing light passes through the light modulation layer 5, the intensity of the transmitted light formed is θ at the minimum wavelength of the second wavelength band E21w1The intensity of the transmitted light is formed to be theta at the maximum wavelength of the second wavelength band E22w2. It is understood that the intensity of the emitted light is reduced and the spectral curve is changed after the emitted light passes through the light-modulating layer 5The trend is unchanged, thereby narrowing the spectral curve and improving the color gamut. As will be appreciated by those skilled in the art, the spectral curve of the emitted light from the sub-pixel 2 has a tailing part in a region with a larger wavelength. Furthermore, the absolute value of the difference between the minimum wavelength of the second waveband E2 and the maximum wavelength of the second waveband E2 is less than or equal to half of the absolute value of the difference between the wavelength corresponding to the maximum intensity of the outgoing light and the maximum wavelength of the second waveband E2, so that the second waveband E1 can be close to the waveband where the trailing part is located, and the intensity of the outgoing light in the waveband where the trailing part is located after passing through the light modulation layer 5 can be reduced, so that the spectral curve is narrowed. The maximum value of the second wavelength band E2 may be equal to the maximum wavelength of the outgoing light, but this disclosure does not specifically limit this. The minimum wavelength of the first wavelength band E1 may be equal to or greater than the wavelength corresponding to the maximum intensity of the outgoing light. Of course, the minimum wavelength of the first waveband E1 may be smaller than the wavelength corresponding to the maximum intensity of the outgoing light, and the absolute value of the difference between the wavelength corresponding to the maximum intensity of the outgoing light and the minimum wavelength of the first waveband E1 is smaller than the absolute value of the difference between the wavelength corresponding to the maximum intensity of the outgoing light and the maximum wavelength of the first waveband E1.
The disclosure reduces the microcavity length of the green sub-pixel to shift the peak of the spectrum curve of the emergent light of the green sub-pixel to the left at 526nm, specifically as shown in fig. 8, L2 is the original spectrum curve of the emergent light of the green sub-pixel, and L21 is the shifted spectrum curve of the emergent light; after the microcavity length of the green sub-pixel is reduced, the color coordinate of the green light of the display panel is changed from (0.221,0.747) to (0.193,0.764), and the color gamut is increased from NTSC @ 1931114% to 120% and from BT 202086% to 89.7%. According to the present disclosure, the micro-cavity length of the red sub-pixel is increased, so that the peak of the spectrum curve of the emergent light of the red sub-pixel moves to the right to 625nm, specifically as shown in fig. 9, L1 is the original spectrum curve of the emergent light of the red sub-pixel, and L11 is the spectrum curve of the emergent light after movement; after the micro cavity length of the red sub-pixel is increased, the color coordinate of the red light of the display panel is changed from (0.685,0.314) to (0.690,0.309), and the color gamut is increased from NTSC @ 1931120% to 121.4% and from BT 202089.7% to 90.6%, as shown in fig. 10 in particular. L1, L2, and L3 in fig. 10 have the same meanings as L1, L2, and L3 in fig. 2, and L4 in fig. 10 corresponds to the color gamut of the display panel after microcavity adjustment.
In another embodiment of the present disclosure, as shown in fig. 6, the wavelength corresponding to the maximum intensity of the outgoing light is greater than the maximum wavelength of the second waveband F2, and the intensity of the outgoing light and the transmittance of the light modulation layer 5 are gradually increased from the minimum wavelength of the second waveband F2 to the maximum wavelength of the second waveband F2, so that the intensity of the outgoing light is decreased after the outgoing light passes through the light modulation layer 5, thereby narrowing the spectral curve and improving the color gamut. Further, an absolute value of a difference between the maximum wavelength of the second wavelength band F2 and the minimum wavelength of the second wavelength band F2 is equal to or less than half of an absolute value of a difference between a wavelength corresponding to the maximum intensity of the outgoing light and the minimum wavelength of the second wavelength band F2. The minimum value of the second wavelength band F2 may be equal to the minimum wavelength of the outgoing light, but this disclosure does not specifically limit this. The maximum wavelength of the first wavelength band F1 may be equal to or less than the wavelength corresponding to the maximum intensity of the outgoing light. Of course, the maximum wavelength of the first band F1 may be larger than the wavelength corresponding to the maximum intensity of the outgoing light, and the absolute value of the difference between the wavelength corresponding to the maximum intensity of the outgoing light and the maximum wavelength of the first band F1 is smaller than the absolute value of the difference between the wavelength corresponding to the maximum intensity of the outgoing light and the minimum wavelength of the first band F1.
In the second wavelength band, the absolute value of the slope of the spectrum curve of the outgoing light from the subpixel 2 is smaller than the absolute value of the slope of the transmission spectrum curve of the light modulation layer 5. When the wavelength corresponding to the maximum intensity of the emergent light is less than the minimum wavelength of the second waveband, the slope of the emergent light spectrum curve of the sub-pixel 2 and the slope of the light-transmitting spectrum curve of the light modulation layer 5 are both negative numbers, and the slope of the emergent light spectrum curve of the sub-pixel 2 is greater than the absolute value of the slope of the light-transmitting spectrum curve of the light modulation layer 5; when the wavelength corresponding to the maximum intensity of the outgoing light is greater than or equal to the maximum wavelength of the second waveband, the slope of the outgoing light spectrum curve of the sub-pixel 2 and the slope of the transmission spectrum curve of the light modulation layer 5 are both positive numbers, and the slope of the outgoing light spectrum curve of the sub-pixel 2 is smaller than the absolute value of the slope of the transmission spectrum curve of the light modulation layer 5.
Taking an example that the plurality of sub-pixels 2 include a first sub-pixel 2001 and a second sub-pixel 2002 which have different emission colors, the light modulation layer 5 includes a first light modulation region 501 and a second light modulation region 502, the first light modulation region 501 is disposed on the light emitting side of the first sub-pixel 2001, the second light modulation region 502 is disposed on the light emitting side of the second sub-pixel 2002, and a light transmission band of the first light modulation region 501 is different from a light transmission band of the second light modulation region 502. Taking the example that the plurality of sub-pixels 2 further include the third sub-pixel 2003, the light modulation layer 5 may further include a third light modulation region 503, the third light modulation region 503 is disposed on the light emitting side of the third sub-pixel 2003, a light transmission waveband of the third light modulation region 503 is different from a light transmission waveband of the first light modulation region 501 or the second light modulation region 502, and an emission color of the third sub-pixel 2003 is different from an emission color of the first sub-pixel 2001 or the second sub-pixel 2002.
Taking the first light modulation region 501 disposed on the light emitting side of the red sub-pixel and the second light modulation region 502 disposed on the light emitting side of the green sub-pixel as an example, the disclosure can shift the light transmission spectrum curve of the first light modulation region 501 to the right, so that the light transmission band of the first light modulation region 501 is greater than or equal to 595nm, as shown in fig. 11 specifically. In fig. 11, K1 is the original transmittance spectrum curve of the first dimming region 501, and K11 is the shifted transmittance spectrum curve. The transmission spectral curve of the second dimming region 502 is shifted to the left so that the transmission wavelength band of the second dimming region 502 is changed from 480nm to 630nm to 460nm to 610nm, as shown in fig. 12. In fig. 12, K2 is the original transmittance spectrum curve of the second dimming region 502, and K21 is the shifted transmittance spectrum curve. After adjustment, the color coordinate of the green light of the display panel is changed from (0.193,0.764) to (0.170,0.776), the color coordinate of the red light is changed from (0.690,0.309) to (0.697,0.303), the color gamut is increased from NTSC @ 1931121.4% to 127.1%, and from BT 202090.6% to 94.9%, as shown in fig. 13. L1, L2, and L3 in fig. 13 have the same meanings as L1, L2, and L3 in fig. 2, and L5 in fig. 13 corresponds to the adjusted color gamut range of the display panel.
To further increase the gamut of the display panel, the present disclosure may change the material of the red sub-pixel, for example, the light emitting material layer 203 of the red sub-pixel is prepared with a deep red material, so that the red sub-pixel emits deep red light. The peak of the spectrum curve of the emergent light of the red sub-pixel emitting deep red light is shifted from 625nm (see fig. 9) to 634nm, and the wavelength range of the spectrum curve of the emergent light is 600nm-720nm, as shown by the solid line in fig. 14. The color coordinates of the deep red light are (0.700, 0.299). Meanwhile, the transmission spectrum curve of the first light adjusting region 501 is shifted to the right, so that the transmission waveband of the first light adjusting region 501 is greater than or equal to 595nm, as shown by the dotted line in fig. 14. Fig. 15 shows a spectral curve (broken line in fig. 15) of light after passing through the first light adjusting region 501, which becomes narrower than a spectral curve (solid line in fig. 15) of outgoing light incident to the first light adjusting region 501. For the spectral curve after passing through the first dimming area 501 in fig. 15 (dashed line in fig. 15), the color coordinates of the red light of the display panel are (0.708,0.292), and the color gamut range is increased from NTSC @ 1931127.1% to 130% and from BT 202094.9% to 96.9%, see fig. 16 in particular. The meanings of L1 and L2 in fig. 16 are the same as those of L1 and L2 in fig. 2, and L6 in fig. 16 corresponds to the color gamut range of the display panel after adjustment. After adjustment, the color gamut Range of the display panel disclosed by the invention can meet the requirement of a High-Dynamic Range (HDR) image.
The light adjusting layer 5 can be prepared by adopting an evaporation process. In the evaporation process, the material of the light modulation layer 5 may be a derivative material based on core structure BODIPY dye (BODIPY). The light adjusting layer 5 formed by the derivative material has a strong absorption band in a 480nm-510nm wave band, and the molar absorption coefficient is as high as 74130M-1cm-1The value of the ordinate (y value) in the color coordinate of blue light can be significantly reduced. In the evaporation process, the material of the dimming layer 5 may be copper phthalocyanine material. The light-adjusting layer 5 formed by the copper phthalocyanine material has a stronger absorption band in the 560nm-610nm wave band, and the molar absorption coefficient is also very high, so that the value (x value) of the abscissa in the color coordinate of green light can be obviously reduced, and the value (x value) of the abscissa in the color coordinate of red light can be slightly increased.
In other embodiments of the present disclosure, the light modulation layer 5 may be prepared by a wet process. The wet process may be inkjet printing or coating exposure, etc. In the wet process, a solute is first dispersed in gelatin, acrylic resin or polyvinyl alcohol resin, and then subjected to coating exposure or inkjet printing. The solute may be an organic pigment such as phthalocyanine, DPP, pyrrolopyrroledione, or the like, or may be a quantum dot, or the like. The thickness of the dimming layer 5 formed by the wet process may be determined according to the concentration of the above solute. For example, the adjustment layer of the present disclosure may have a thickness of 3 μm and a light transmittance of 60%.
The embodiment of the disclosure also provides a display device. The display device may include the display panel described in any of the above embodiments. The display device may be a mobile phone, a tablet computer, a television, or the like. Since the display panel in the display device of the embodiment of the present disclosure is the same as the display panel in the embodiment of the display panel, the display device has the same beneficial effects, and the description thereof is omitted.
Although the present disclosure has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the disclosure.
Claims (19)
1. A display panel, comprising:
a substrate base plate;
the light emitting layer is arranged on the substrate and comprises a plurality of sub-pixels, the plurality of sub-pixels comprise first sub-pixels, and emergent light of the first sub-pixels comprises at least one monochromatic light; the emergent light wave bands of the first sub-pixels have a first wave band and a second wave band which are continuous, the emergent light with the wavelength positioned in the first wave band is first emergent light, the emergent light with the wavelength positioned in the second wave band is second emergent light, and the intensity of the first emergent light is greater than that of the second emergent light;
the dimming layer is arranged on the light emitting side of the sub-pixel and can transmit light; and the light transmittance of the light modulation layer to the first emergent light is more than or equal to that of the light modulation layer to the second emergent light.
2. The display panel according to claim 1, wherein a wavelength corresponding to a maximum intensity of the outgoing light is smaller than a minimum wavelength of the second wavelength band.
3. The display panel according to claim 2, wherein the maximum wavelength of the second wavelength band is equal to the maximum wavelength of the outgoing light band.
4. The display panel according to claim 2, wherein an absolute value of a difference between a minimum wavelength of the second wavelength band and a maximum wavelength of the second wavelength band is equal to or less than half of an absolute value of a difference between a wavelength corresponding to a maximum intensity of the outgoing light and the maximum wavelength of the second wavelength band.
5. The display panel according to claim 2, wherein a minimum wavelength of the first wavelength band is equal to or greater than a wavelength corresponding to a maximum intensity of the outgoing light.
6. The display panel according to claim 2, wherein a minimum wavelength of the first wavelength band is smaller than a wavelength corresponding to a maximum intensity of the outgoing light, and an absolute value of a difference between the wavelength corresponding to the maximum intensity of the outgoing light and the minimum wavelength of the first wavelength band is smaller than an absolute value of a difference between the wavelength corresponding to the maximum intensity of the outgoing light and the maximum wavelength of the first wavelength band.
7. The display panel according to claim 1, wherein a maximum intensity of the outgoing light corresponds to a wavelength longer than a maximum wavelength of the second wavelength band.
8. The display panel according to claim 7, wherein a minimum wavelength of the second wavelength band is equal to a minimum wavelength of the outgoing light band.
9. The display panel according to claim 7, wherein an absolute value of a difference between a maximum wavelength of the second wavelength band and a minimum wavelength of the second wavelength band is equal to or less than half of an absolute value of a difference between a wavelength corresponding to a maximum intensity of the outgoing light and the minimum wavelength of the second wavelength band.
10. The display panel according to claim 7, wherein a maximum wavelength of the first wavelength band is equal to or less than a wavelength corresponding to a maximum intensity of the outgoing light.
11. The display panel according to claim 7, wherein a maximum wavelength of the first wavelength band is larger than a wavelength corresponding to a maximum intensity of the outgoing light, and an absolute value of a difference between the wavelength corresponding to the maximum intensity of the outgoing light and the maximum wavelength of the first wavelength band is smaller than an absolute value of a difference between the wavelength corresponding to the maximum intensity of the outgoing light and the minimum wavelength of the first wavelength band.
12. The display panel according to claim 1, wherein the intensity of the outgoing light gradually increases and the light transmittance of the light modulation layer gradually increases from a minimum wavelength of the second wavelength band to a maximum wavelength of the second wavelength band; or
From the minimum wavelength of the second wave band to the maximum wavelength of the second wave band, the intensity of the emergent light is gradually reduced, and the light transmittance of the light modulation layer is gradually reduced.
13. The display panel of claim 1, wherein the sub-pixels comprise:
the first electrode is arranged on the substrate base plate;
the light-emitting material layer is arranged on one side, back to the substrate, of the first electrode;
the second electrode is arranged on one side, back to the first electrode, of the luminescent material layer;
one of the first electrode and the second electrode is a reflecting electrode, and the other one of the first electrode and the second electrode is a semi-transparent semi-reflecting electrode.
14. The display panel according to claim 13, wherein the plurality of sub-pixels includes a second sub-pixel, the first sub-pixel generates monochromatic light different from that of the second sub-pixel, and a distance between the first electrode and the second electrode of the first sub-pixel is different from that of the second sub-pixel.
15. The display panel according to claim 1, wherein a side of the sub-pixel facing away from the substrate base plate is a light exit side of the sub-pixel, the display panel further comprising:
the packaging layer is arranged on one side, back to the substrate, of the light-emitting layer;
the light adjusting layer is arranged on one side, back to the substrate base plate, of the packaging layer, or the light adjusting layer is arranged between the packaging layer and the light emitting layer.
16. The display panel according to claim 1, wherein a material of the light modulation layer comprises a derivative of a boron-fluorine dipyrrole dye or copper phthalocyanine.
17. The display panel according to claim 1, wherein the first sub-pixel is a green sub-pixel, and a wavelength corresponding to a maximum intensity of outgoing light of the green sub-pixel is 510nm to 530 nm.
18. The display panel according to claim 1, wherein the first sub-pixel is a green sub-pixel, and the light-transmitting wavelength band of the light modulation layer is 460nm to 610 nm; or
The first sub-pixel is a red sub-pixel, and the light-transmitting wave band of the light modulation layer is greater than or equal to 595 nm.
19. A display device characterized by comprising the display panel according to any one of claims 1 to 18.
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