CN113009736A - Display panel and display device - Google Patents
Display panel and display device Download PDFInfo
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- CN113009736A CN113009736A CN201911311277.5A CN201911311277A CN113009736A CN 113009736 A CN113009736 A CN 113009736A CN 201911311277 A CN201911311277 A CN 201911311277A CN 113009736 A CN113009736 A CN 113009736A
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- layer
- liquid crystal
- display panel
- backlight
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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
-
- 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
-
- 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
- G02F1/1347—Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells
Abstract
The application discloses a display panel and a display device, wherein the display panel comprises a backlight layer, a first polarizing layer, a dimming liquid crystal layer, a light conversion layer, a display liquid crystal layer and a second polarizing layer which are arranged in a stacked mode; the backlight layer is used for emitting blue light; the light conversion layer is used for converting the blue light which penetrates through the dimming liquid crystal layer into white light. According to the scheme, the blue light has higher transmittance than that of the white light transmitting the dimming liquid crystal layer, so that the brightness of the display panel can be improved.
Description
Technical Field
The present invention generally relates to the field of display technologies, and in particular, to a display panel and a display device.
Background
In the field of LCD (Liquid Crystal Display), it is an object of those skilled in the art to improve the brightness, contrast and color gamut of the Display.
The DCLD (Dual Cell Local Dimming) is an emerging technology in the liquid crystal display industry, and can improve the contrast of the liquid crystal display from 1200 to 100000+, and the improved contrast is close to or even exceeds that of an OLED (Organic Light-Emitting Diode). The main structure of the DCLD includes a backlight, a dimming liquid crystal layer, and a display liquid crystal layer, which are stacked. The dimming liquid crystal layer performs local dimming, and the display liquid crystal layer is used for image display. The DCLD adopts two liquid crystal layers, and the backlight light is lost after passing through the liquid crystal layers, which causes a reduction in brightness, and how to improve the display brightness under the same backlight condition is a technical problem that needs to be solved by those skilled in the art.
Disclosure of Invention
The present application is intended to provide a display panel and a display device for improving the brightness of a liquid crystal display.
In a first aspect, the present invention provides a display panel, including a backlight layer, a first polarizing layer, a dimming liquid crystal layer, a light conversion layer, a display liquid crystal layer, and a second polarizing layer, which are stacked;
the backlight layer is used for emitting blue light;
the light conversion layer is used for converting the blue light which penetrates through the dimming liquid crystal layer into white light.
As one implementation, the light conversion layer includes a third polarizing layer, a quantum dot layer, and a fourth polarizing layer, which are stacked.
As an implementation manner, a side of the third polarization layer facing away from the quantum dot layer and a side of the fourth polarization layer facing away from the quantum dot layer are respectively provided with a protection layer.
As an implementation manner, a side of the protection layer facing away from the quantum dot layer is provided with an adhesive layer.
As an implementation manner, the backlight layer includes a backlight plate and a blue light backlight source, and the blue light backlight source is disposed on a side surface of the backlight plate.
As an implementation manner, the blue light backlight source is a blue LED.
As an implementation manner, the dimming liquid crystal layer is a TN type liquid crystal display panel or an ADS type liquid crystal display panel.
The dimming liquid crystal layer comprises an array substrate, a liquid crystal layer and a pixel defining layer which are sequentially arranged, wherein the pixel defining layer comprises a black matrix, the black matrix is provided with an opening for defining sub-pixels, and no color resistor is arranged in the opening or a colorless filling layer is arranged in the opening.
As an implementation manner, the display liquid crystal layer is an ADS type liquid crystal display panel.
In a second aspect, the present invention provides a display device, including the display panel.
According to the scheme, the blue light has higher transmittance than that of the white light transmitting the dimming liquid crystal layer, so that the brightness of the display panel can be improved.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
fig. 1 is a schematic structural diagram of a display panel according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a light conversion layer provided by an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a light conversion layer provided in another embodiment of the present invention;
fig. 4 is a graph showing TN mode transmittance and in-plane retardation.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
Fig. 1 is a display panel according to an embodiment of the present invention, which includes a backlight layer, a first polarizing layer 3, a dimming liquid crystal layer 4, a light conversion layer 5, a display liquid crystal layer 6, and a second polarizing layer 7, which are stacked in a stacked manner; the backlight layer is used for emitting blue light; the light conversion layer 5 serves to convert blue light transmitted through the dimming liquid crystal layer 4 into white light.
When the display panel is used, the backlight layer emits blue light, the blue light belongs to natural light, the polarization direction of the blue light is different, whether the blue light passes through the dimming liquid crystal layer 4 can be controlled, the blue light needs to be converted into linearly polarized light, therefore, the first polarizing layer 3 is arranged on the backlight layer, the blue light emitted by the backlight layer is converted into the linearly polarized light blue light after passing through the first polarizing layer 3, and the deflection direction of the linearly polarized light blue light is parallel to the transmission axis of the first polarizing layer 3.
It can be understood that the dimming liquid crystal layer 4 and the display liquid crystal layer 6 both include an array substrate, a liquid crystal layer, and a color film substrate, and the array substrate, the liquid crystal layer, and the color film substrate may all adopt existing structures, and detailed descriptions of specific structures thereof are omitted here.
The deflection of the liquid crystal at each sub-pixel position of the liquid crystal layer is controlled by dimming the array substrate of the liquid crystal layer 4 to control the blue transmittance of the linearly polarized light at each sub-pixel position to control the brightness of the corresponding sub-pixel.
The linearly polarized blue light transmitted through the dimming liquid crystal layer 4 enters the light conversion layer, and the light conversion layer 5 converts the linearly polarized blue light into white light and emits the white light to the display liquid crystal layer 6 as a backlight light source of the display liquid crystal layer 6.
According to the scheme, the blue light has higher transmittance than that of the white light transmitting the dimming liquid crystal layer, so that the brightness of the display panel can be improved.
In addition, the contrast of the dimming liquid crystal layer and the display liquid crystal layer can be improved by improving the brightness of the backlight, the color resistance in a medium color film substrate of the display liquid crystal layer and the like, and after the contrast of the dimming liquid crystal layer and the display liquid crystal layer is improved, the contrast of the display panel formed by overlapping the dimming liquid crystal layer and the display liquid crystal layer can be obviously improved, for example, but not limited to, the contrast of the dimming liquid crystal layer and the display liquid crystal layer is improved to 1000, and then the contrast of the display panel formed by overlapping the dimming liquid crystal layer and the display liquid crystal.
As one implementation, as shown in fig. 2, the light conversion layer includes a third polarizing layer 41, a quantum dot layer 40, and a fourth polarizing layer 42, which are stacked.
After the blue light of the linearly polarized light passes through the first display panel 4, the polarization direction can be changed, the third polarizing layer 41 is arranged in the light conversion layer to convert the blue light with the changed polarization direction into the linearly polarized light with the mutually parallel polarization directions and then enter the quantum dot layer 40, the linearly polarized blue light with the mutually parallel polarization directions passes through the quantum dot layer 40, and then the red light and the green light are emitted from the quantum dot material. The white light is deflected in the polarization direction after passing through the display liquid crystal layer 6, and the deflected red light, green light and blue light show a display picture with high contrast after passing through the second polarization layer 7.
In addition, under the excitation of blue light, the excited quantum dot material emits purer red light and green light, thereby expanding the color gamut of the display panel, wherein the color gamut of the display panel is up to more than 100% of the color gamut of National Television Standards Committee (NTSC).
The quantum dot material is, for example, but not limited to, at least one of a silicon quantum dot material, a germanium quantum dot material, a cadmium sulfide quantum dot material, a cadmium selenide quantum dot material, a cadmium telluride quantum dot material, a zinc selenide quantum dot material, a lead sulfide quantum dot material, a lead selenide quantum dot material, an indium phosphide quantum dot material, and an indium arsenide quantum dot material.
As one implementation, as shown in fig. 3, in order to protect the third polarizing layer 41 and the fourth polarizing layer 42, protective layers 43 and 44 are respectively disposed on a side of the third polarizing layer 41 away from the quantum dot layer 40 and a side of the fourth polarizing layer 42 away from the quantum dot layer 40. The material of the protective layers 43, 44 is, for example, but not limited to, TAC (Tri-cellulose Acetate).
As a practical way, in order to connect the light conversion layer between the dimming liquid crystal layer 4 and the display liquid crystal layer 6, adhesive layers 45, 46 are provided on the side of the protective layers 43, 44 facing away from the quantum dot layer 40. The material of the Adhesive layers 45, 46 is, for example, but not limited to PSA (Pressure Sensitive Adhesive).
As one of the realizations, the transmission axes of the first, third and fourth polarizing layers 3, 41, 42 are parallel and perpendicular to the transmission axis of the second polarizing layer 7.
As an implementation manner, the backlight layer includes a backlight plate 2 and a blue light backlight source 1, and the blue light backlight source 1 is disposed on a side surface of the backlight plate 2.
The side surface of the backlight plate 2 is used as a light incident surface, one surface of the backlight plate 2 can be provided with a grating which is used as a light exit port, and blue light emitted by the blue light backlight source enters the backlight plate from the light incident surface, is totally reflected in the backlight plate, and exits from the light exit port to the dimming liquid crystal layer in a path vertical to the dimming liquid crystal layer.
As an implementation manner, the blue light backlight 1 may be a blue LED.
The broad blue light refers to visible light with the wavelength of 400-500 nm, wherein the blue light with the wavelength of 400-450 nm is high in energy, is pathogenic visible light, can cause macular degeneration of eyes when the eyes are irradiated for a long time, and can select a blue light LED with the wavelength of 460-480 nm to protect the eyes of a user in order to achieve the effect of preventing the blue light.
As one implementation, the dimming liquid crystal layer 4 is a TN (Twisted Nematic) type liquid crystal display panel or an ADS (Advanced Super Dimension Switch) type liquid crystal display panel.
As an implementation manner, in order to improve the transmittance of light, the dimming liquid crystal layer 4 includes an array substrate, a liquid crystal layer, and a pixel defining layer sequentially disposed, and the pixel defining layer includes a black matrix having an opening defining a sub-pixel, and no color resist is disposed in the opening or a colorless filling layer is disposed in the opening. It is understood that the sub-pixel regions of the pixel defining layer are not provided with color resistors of three primary colors of RGB (Red Green Blue; Red salary Blue), but are provided with colorless filling layers or are not provided with any color resistors, so that the pixel defining layer can transmit light of any color. For example, but not limited to, the colorless fill layer may be made of other materials that produce the three primary color resists in addition to the pigments that are removed, and it is understood that the material of the colorless fill layer may be the same as the material that produces the three primary color resists, except that the colorless fill layer does not contain RGB pigments. The absence of color drag in the opening is understood to mean that the opening is in a configuration of the cavity.
In order to improve the transmittance, the thickness of the liquid crystal in the dimming liquid crystal layer may be determined by the following relational expression.
Re＝Δnd；
Where I is the transmittance, Re is the in-plane retardation, Δ n is the birefringence of the liquid crystal, d is the thickness of the liquid crystal layer, and λ is the wavelength of light.
As shown in FIG. 4, when the transmittance I is maximized, the in-plane retardation Re is 407nm as calculated by the above formula, taking blue light having a wavelength of 470nm as an example. Since the corresponding birefringence of different liquid crystals is different, after the liquid crystals are selected, for the same birefringence, for example, the transmittance is improved, and the thickness of the liquid crystal layer can be adjusted accordingly.
Under the condition of certain transmittance, based on the selected wavelength range of the blue light, a better in-plane optical path difference can be determined, for example, the in-plane optical path difference is 410 nm-420 nm, the thickness of the liquid crystal layer is determined according to the in-plane optical path difference, and the transmittance of the blue light can be improved by more than 5% compared with that of the white light under the condition of the same liquid crystal layer.
As an implementation manner, the display liquid crystal layer 6 is an ADS type liquid crystal display panel, and the ADS type liquid crystal display panel can improve the color gradation and the visual angle of the display panel, and has high color restoration accuracy.
In a second aspect, the present invention provides a display device, including the display panel. The display device may be a television, a tablet computer, or the like.
It will be understood that any orientation or positional relationship indicated above with respect to the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," etc., is based on the orientation or positional relationship shown in the drawings and is for convenience in describing and simplifying the invention, and does not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and is therefore not to be considered limiting of the invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by those skilled in the art that the scope of the invention herein disclosed is not limited to the particular combination of features described above, but also encompasses other arrangements formed by any combination of the above features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.
Claims (10)
1. A display panel is characterized by comprising a backlight layer, a first polarizing layer, a dimming liquid crystal layer, a light conversion layer, a display liquid crystal layer and a second polarizing layer which are arranged in a stacking manner;
the backlight layer is used for emitting blue light;
the light conversion layer is used for converting the blue light which penetrates through the dimming liquid crystal layer into white light.
2. The display panel of claim 1, wherein the light conversion layer comprises a third polarizing layer, a quantum dot layer, and a fourth polarizing layer arranged in a stack.
3. The display panel according to claim 2, wherein a side of the third polarizing layer facing away from the quantum dot layer and a side of the fourth polarizing layer facing away from the quantum dot layer are respectively provided with a protective layer.
4. A display panel as claimed in claim 3 characterized in that the side of the protection layer facing away from the quantum dot layer is provided with an adhesive layer.
5. The display panel according to any one of claims 1 to 4, wherein the backlight layer comprises a backlight plate and a blue light backlight source, and the blue light backlight source is disposed on a side surface of the backlight plate.
6. The display panel of claim 5, wherein the blue backlight is a blue LED.
7. The display panel according to any one of claims 1 to 4, wherein the dimming liquid crystal layer is a TN type liquid crystal display panel or an ADS type liquid crystal display panel.
8. The display panel of claim 7, wherein the dimming liquid crystal layer comprises an array substrate, a liquid crystal layer, and a pixel defining layer sequentially disposed, wherein the pixel defining layer comprises a black matrix having an opening defining a sub-pixel, and wherein no color resist is disposed in the opening or a colorless filling layer is disposed in the opening.
9. The display panel according to any one of claims 1 to 4, wherein the display liquid crystal layer is an ADS type liquid crystal display panel.
10. A display device characterized by comprising the display panel according to any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911311277.5A CN113009736A (en) | 2019-12-18 | 2019-12-18 | Display panel and display device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911311277.5A CN113009736A (en) | 2019-12-18 | 2019-12-18 | Display panel and display device |
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| CN113009736A true CN113009736A (en) | 2021-06-22 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113820884A (en) * | 2021-10-27 | 2021-12-21 | 京东方科技集团股份有限公司 | Backlight module, manufacturing method thereof and display device |
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