CN114428417A - Display panel and display device - Google Patents
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- CN114428417A CN114428417A CN202210052270.1A CN202210052270A CN114428417A CN 114428417 A CN114428417 A CN 114428417A CN 202210052270 A CN202210052270 A CN 202210052270A CN 114428417 A CN114428417 A CN 114428417A
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- 230000008859 change Effects 0.000 claims abstract description 79
- 230000004044 response Effects 0.000 claims abstract description 14
- 239000012782 phase change material Substances 0.000 claims description 26
- 230000005540 biological transmission Effects 0.000 claims description 20
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 17
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 14
- 239000000377 silicon dioxide Substances 0.000 claims description 9
- 239000003086 colorant Substances 0.000 claims description 8
- 241001270131 Agaricus moelleri Species 0.000 claims description 4
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 3
- 235000012239 silicon dioxide Nutrition 0.000 claims description 3
- 229910052709 silver Inorganic materials 0.000 claims description 3
- 239000004332 silver Substances 0.000 claims description 3
- 239000004408 titanium dioxide Substances 0.000 claims description 3
- 238000002310 reflectometry Methods 0.000 description 16
- 239000004973 liquid crystal related substance Substances 0.000 description 11
- 238000000985 reflectance spectrum Methods 0.000 description 8
- 229910052681 coesite Inorganic materials 0.000 description 6
- 229910052906 cristobalite Inorganic materials 0.000 description 6
- 229910052682 stishovite Inorganic materials 0.000 description 6
- 238000002834 transmittance Methods 0.000 description 6
- 229910052905 tridymite Inorganic materials 0.000 description 6
- 238000001228 spectrum Methods 0.000 description 4
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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
- G02F1/133553—Reflecting elements
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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
- G02F1/133509—Filters, e.g. light shielding masks
- G02F1/133514—Colour filters
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Liquid Crystal (AREA)
Abstract
The application provides a display panel and a display device, wherein in each sub-pixel of the display panel, a collimating light source is used for emitting collimating light to a first direction, a semi-permeable and semi-reflecting layer is used for reflecting at least part of the collimating light along a second direction to obtain reflected light, a filter layer is used for transmitting part of the reflected light to the second direction to obtain target colored light, the wave band of the target colored light is positioned in the transmitting wave band of the filter layer, the reflecting wave band of the phase change layer is positioned in the transmitting wave band range of the filter layer, the transflective layer is used for reflecting the target color light to the transflective layer along a third direction, the third direction is opposite to the second direction, the transflective layer is also used for transmitting at least part of the target color light along the third direction, when the phase change layer is electrified, the reflected light intensity of the target color light changes along with the change of the driving voltage, so that the sub-image displays the gray scale corresponding to the driving voltage, and the response time of the phase change layer is in a nanosecond level. The display panel can achieve ultrahigh refresh frequency.
Description
Technical Field
The application relates to the technical field of display, in particular to a display panel and a display device.
Background
With the continuous improvement of communication capability, the requirement of people on the display refresh frequency is higher and higher. For the liquid crystal display panel, when a refresh frequency of 480Hz is required, the liquid crystal needs to respond within at least 2 milliseconds, and if a higher refresh frequency is required, a higher requirement is made on the response time of the liquid crystal, but due to the characteristics of the liquid crystal, the response time is usually only in the millisecond level, so that the improvement of the refresh frequency is limited, and the liquid crystal display panel with an ultrahigh refresh frequency cannot be obtained.
Therefore, the conventional liquid crystal display panel has a technical problem that the ultra-high refresh frequency cannot be realized, and needs to be improved.
Disclosure of Invention
The embodiment of the application provides a display panel and a display device, which are used for relieving the technical problem that the existing liquid crystal display panel cannot realize ultrahigh refresh frequency.
The present application provides a display panel including a plurality of sub-pixels, the sub-pixels including:
the collimation light source is used for emitting collimation light to the first direction;
the semi-transparent semi-reflective layer is positioned on a propagation path of the collimated light rays and used for reflecting at least part of the collimated light rays along a second direction to obtain reflected light rays, and the second direction is not parallel to the first direction;
the filter layer is positioned on the propagation path of the reflected light and used for transmitting part of the reflected light to the second direction to obtain target colored light, and the waveband of the target colored light is positioned in the transmission waveband of the filter layer;
the incident surface of the phase change layer corresponds to the emergent surface of the filter layer, the reflection waveband of the phase change layer is located within the range of the transmission waveband of the filter layer and is used for reflecting the target color light to the semi-transparent and semi-reflective layer along a third direction, the third direction is opposite to the second direction, and the semi-transparent and semi-reflective layer is also used for transmitting at least part of the target color light along the third direction;
when the phase change layer is electrified, the reflected light intensity of the target color light changes along with the change of the driving voltage, so that the display panel displays a gray scale corresponding to the driving voltage, and the response time of the phase change layer is in a nanosecond level.
In one embodiment, the phase change layer includes a plurality of phase change material layers and a plurality of auxiliary layers, the plurality of phase change material layers and the plurality of auxiliary layers are alternately stacked, and the auxiliary layers have different refractive indexes from the phase change material layers.
In one embodiment, the phase change material layer has a first refractive index when in an amorphous state and a second refractive index when in a crystalline state, the first refractive index being different from the second refractive index, the phase change material layer, when energized, having a refractive index that varies between the first refractive index and the second refractive index.
In one embodiment, the auxiliary layer comprises at least one sub-auxiliary layer, adjacent sub-auxiliary layers having different refractive indices.
In one embodiment, the material of the sub-auxiliary layer includes silicon dioxide, titanium dioxide, or silver.
In one embodiment, the thickness of each film layer in the phase change layer is different.
In one embodiment, the display panel includes multiple types of sub-pixels, and the filter layers corresponding to the sub-pixels have different transmission bands, so that the sub-pixels display different colors.
In one embodiment, the filter layer includes a plurality of sub-filter layers stacked, and refractive indices of adjacent two sub-filter layers are different.
In one embodiment, the collimated light source includes a white light source and a collimating lens positioned in an exit light path of the white light source.
An embodiment of the present application further provides a display device, including the display panel and the driving chip described in any one of the above.
Has the advantages that: the application provides a display panel and a display device, the display panel comprises a plurality of sub-pixels, each sub-pixel comprises a collimation light source, a semi-permeable and semi-reflective layer, a filter layer and a phase change layer, the collimation light source is used for emitting collimation light to a first direction, the semi-permeable and semi-reflective layer is positioned on a propagation path of the collimation light and is used for reflecting at least part of the collimation light along a second direction to obtain reflection light, the second direction is not parallel to the first direction, the filter layer is positioned on the propagation path of the reflection light and is used for transmitting part of the reflection light to the second direction to obtain target color light, the wave band of the target color light is positioned in the transmission wave band of the filter layer, the light incident surface of the phase change layer corresponds to the light emergent surface of the filter layer, the reflection wave band of the phase change layer is positioned in the transmission wave band range of the filter layer and is used for reflecting the target color light to the semi-permeable and semi-reflective layer along a third direction, and the third direction are opposite to the second direction, the transflective layer is further used for transmitting at least part of target color light along a third direction, wherein when the phase change layer is electrified, the reflected light intensity of the target color light changes along with the change of the driving voltage, so that the sub-pixels display gray scales corresponding to the driving voltage, and the response time of the phase change layer is nanosecond. In the display panel of this application, the accessible adjusts the reflection wave band that sees through the wave band and the phase change layer of filter layer and shows required target chromatic light, realizes different greyscales through inputing different drive voltage to the phase change layer to display panel's display function has been realized, and because the response time of phase change layer is the nanosecond level, has promoted an order of magnitude for the millisecond response of liquid crystal, consequently can realize the superelevation frequency of refreshing.
Drawings
The technical solutions and other advantages of the present application will become apparent from the following detailed description of specific embodiments of the present application when taken in conjunction with the accompanying drawings.
Fig. 1 is a schematic structural diagram of each sub-pixel in a display panel according to an embodiment of the present disclosure.
Fig. 2 is a transmittance spectrum of the filter layer in table 1.
Fig. 3 is a reflectance spectrum of the phase change layer in table 2 in an amorphous state.
Fig. 4 is a reflectance spectrum of the phase change layer in table 2 in a crystalline state.
Fig. 5 shows reflectance spectra of the filter layer in table 1 and the phase change layer in table 2 after being stacked.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be construed as limiting the present application. 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, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
In the description of the present application, it should be noted that, unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, a fixed connection, a detachable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In this application, unless expressly stated or limited otherwise, the recitation of a first feature "on" or "under" a second feature may include the recitation of the first and second features being in direct contact, and may also include the recitation of the first and second features not being in direct contact, but being in contact with another feature between them. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The following disclosure provides many different embodiments or examples for implementing different features of the application. In order to simplify the disclosure of the present application, specific example components and arrangements are described below. Of course, they are merely examples and are not intended to limit the present application. Moreover, the present application may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, examples of various specific processes and materials are provided herein, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.
The embodiment of the application provides a display panel and a display device, which are used for relieving the technical problem that the existing liquid crystal display panel cannot realize ultrahigh refresh frequency.
As shown in fig. 1, the present application provides a display panel, which includes a plurality of sub-pixels, each sub-pixel includes a collimated light source, a transflective layer 30, a filter layer 40 and a phase change layer 50, the collimated light source is configured to emit collimated light 11 in a first direction X, the transflective layer 30 is located on a propagation path of the collimated light 11 and is configured to reflect at least part of the collimated light 11 in a second direction Y1 to obtain reflected light 12, the second direction Y1 is not parallel to the first direction X1, the filter layer 40 is located on the propagation path of the reflected light 12 and is configured to transmit part of the reflected light 12 in a second direction Y1 to obtain target color light, a wavelength band of the target color light is located in a transmission wavelength band of the filter layer 40, an incident surface of the phase change layer 50 corresponds to an emergent surface of the filter layer 40, a reflection wavelength band of the phase change layer 50 is located in a transmission wavelength band of the filter layer 40 and is configured to reflect the target color light 13 in a third direction Y2 to the transflective layer 30, the third direction Y2 is opposite to the second direction Y1, and the transflective layer 30 is further configured to transmit at least a portion of the target color light 13 along the third direction Y2, wherein when the phase change layer 50 is powered on, the reflected light intensity of the target color light 13 changes with the change of the driving voltage, so that the sub-pixels display the gray scale corresponding to the driving voltage, and the response time of the phase change layer 50 is in the order of nanoseconds.
The collimated light source includes a white light source 10 and a collimating lens 20 positioned on a light exit path of the white light source 10. The white light source 10 emits white light, which includes multiple colors of light, such as red light, blue light, green light, etc., and the wavelength bands of the light corresponding to the colors of light are different. The white light emitted from the white light source 10 has divergence, and the distance between the light rays gradually increases with the increase of the propagation distance, and the white light passing through the collimating lens 20 becomes collimated light rays, i.e., parallel to each other, by providing the collimating lens 20 on a certain light-emitting path of the white light source 10. This arrangement allows collimated light to be directed toward the transflective layer 30 in a uniform direction, so that the direction of the reflected light is uniform, thereby avoiding the influence of the difference in incident angle of the light on the reflection angle and the interference with the final display effect.
The transflective layer 30 has a transflective characteristic in that a beam of light incident on the transflective layer 30 may partially pass through the transflective layer 30 and partially be reflected at an incident surface of the transflective layer 30. Thus, when collimated light rays 11 impinge upon the transflective layer 30 in a first direction X, portions of the collimated light rays 11 will be reflected in a second direction Y1, resulting in reflected light rays 12. In the embodiment of the present application, the first direction X is not parallel to the second direction Y1, and the second direction Y1 is parallel to the light emitting direction of the display panel, which is a vertical direction in fig. 1, and according to the principle of light reflection, the incident angle is equal to the reflection angle, so that the transflective layer 30 is disposed obliquely. Specifically, the semi-permeable and semi-reflective layer 30 may be disposed at an inclination angle of 45 degrees with respect to the second direction Y1, and then the first direction X is a horizontal direction at this time, and both the incident angle and the reflection angle are 45 degrees. Alternatively, the semi-transparent and semi-reflective layer 30 may be tilted at an angle with respect to the second direction Y1, so long as the angle ensures that the reflected light 12 can enter the filter layer 40 along the designated second direction Y1.
The phase change layer 50 has the property of reflecting only certain wavelength bands, and the wavelength bands that the phase change layer 50 can reflect, which are referred to as reflection wavelength bands in the embodiment of the present application, can be controlled by setting the material of the phase change layer, and light outside the reflection wavelength bands can be regarded as not being reflected due to very low reflectivity. The reflection wavelength band is within the transmission wavelength band of the filter layer 40, so that all or part of the target color light 13 can be reflected to the transflective layer 30 along the reverse third direction Y2, and then a part of the target color light 13 is transmitted by the transflective layer 30, where the transmitted target color light 13 is the color finally displayed by the display panel.
The phase change layer 50 is made of a phase change material as a base material, the phase change material has the characteristic of switching between an amorphous state and a crystalline state under the action of driving voltage, when the driving voltage is lower, the temperature of the phase change material can be raised to a temperature range above the crystallization temperature and below the melting temperature, and crystal lattices are orderly arranged to form crystals, so that the amorphous state is switched to the crystalline state; on the contrary, when a large driving voltage is applied, the temperature of the phase-change material rises above the melting temperature, the order of the crystal lattice is destroyed, and the crystalline state is switched to the amorphous state. The phase change layer 50 can be reversibly switched between the crystalline state and the amorphous state by changing the magnitude, duration, etc. of the driving voltage. When the state of the phase change layer 50 is changed, its refractive index is also changed, so that the intensity of reflected light is changed.
The phase change layer 50 and the filter layer 40 are matched with each other through the reflection waveband and the passing waveband, so that the target color light 13 reflected to the transflective layer 30 only comprises light rays in a certain waveband, and therefore, only the color in the waveband can be displayed, when different driving voltages are input, the refractive index of the phase change layer 50 is changed, the reflection light intensity of the target color light 13 obtained through reflection is different, and therefore, the corresponding sub-pixels can display the gray scale corresponding to the target color light 13, and through the process, the color display and the gray scale display of each sub-pixel are realized. In addition, when the phase-change material is switched between the amorphous state and the crystalline state, the response time is nanosecond level, namely the state switching can be completed within the nanosecond level time, so the gray scale switching time is also nanosecond level, and the millisecond level response is improved by one order of magnitude relative to the liquid crystal, so the ultrahigh refresh frequency can be realized.
In one embodiment, the display panel includes multiple types of sub-pixels, and the transmission wavelength bands of filter layer 40 corresponding to the sub-pixels are different, so that the sub-pixels display different colors. For each sub-pixel, the target color light 13 of one color is obtained by adopting the above structures, and corresponding to the whole display panel, the structures of the filter layer 40 and the phase change layer 50 can be adjusted to make the transmission wave bands and the reflection wave bands corresponding to different types of sub-pixels different, so that the sub-pixels respectively display different colors, for example, red, green and blue colors are displayed, a red sub-pixel, a green sub-pixel and a blue sub-pixel can be formed, the sub-pixels of three colors form a complete pixel, and finally, the display panel can realize color display.
In one embodiment, the phase change layer 50 includes a plurality of phase change material layers and a plurality of auxiliary layers alternately stacked, the auxiliary layers having a different refractive index from the phase change material layers. When the phase change layer 50 is powered on, the refractive index of the phase change material layer can be changed, the refractive index of the auxiliary layer is fixed and cannot be changed, and through the stacking of a plurality of film layers with different refractive indexes, the target color light 13 is refracted for multiple times at the interface of the film layers, so that the control of the reflection spectrum in the usable state can be increased, and the final required reflection light intensity can be obtained.
The phase change material layer has a first refractive index when in an amorphous state and a second refractive index when in a crystalline state, the first refractive index being different from the second refractive index, the refractive index of the phase change material layer changing between the first refractive index and the second refractive index when energized. When a driving voltage is input to the phase change layer 50, each phase change material layer is switched between a completely crystalline state and a completely amorphous state, and the phase change material layers can be in a mixed state of an intermediate crystalline state and an amorphous state, and according to different driving voltages, phase change material layers with different proportions of phase states can be mixed, for example, 30% of the phase states are crystalline states and 70% of the phase states are amorphous states, and according to different proportions of the crystalline states and the amorphous states, corresponding refractive indexes are different, from the completely crystalline state and the completely amorphous states, a plurality of phase change material layers with different degrees of crystallinity can be obtained by controlling the driving voltage, each scheme corresponds to different refractive indexes, and further corresponds to different reflection light intensities, for example, 128 gray scales can be displayed when 128 refractive indexes are obtained.
In an embodiment, the auxiliary layer comprises at least one sub-auxiliary layer, the refractive index of adjacent sub-auxiliary layers being different. The sub-auxiliary layers with different refractive indexes have different extinction coefficients, and when the sub-auxiliary layers are stacked together, the controllability of the reflection light intensity can be further improved, so that the finally required reflection light intensity can be obtained. The material of the sub auxiliary layer may be silicon dioxide, titanium dioxide, silver, or the like.
In one embodiment, the thicknesses of the film layers in the phase change layer are not equal. By stacking a plurality of film layers with different thicknesses, the reflectivity spectrum can be made to reach or approach the desired ideal state.
The adjustment of the intensity of the reflected light is embodied by the wavelength difference corresponding to the reflectivity peak value and the transmittance peak value. The working principle of the filter layer and the phase change layer will be described with reference to specific numerical values. In this application, filter layer 40 and phase change layer 50 each include a plurality of layers of the stacked arrangement, as shown in table 1, showing the specific material and thickness of each sub-filter layer in the filter layer, as shown in table 2, showing the specific material and thickness of each layer in the phase change layer, where SB2S3The layer is a phase change material layer, and two adjacent SB2S3The film layer between the layers being an auxiliary layer, SiO2The layer and the Ag layer are sub-auxiliary layers in the auxiliary layer.
TABLE 1 specific materials and thicknesses of the sublayers in the filter layer
| Film material | Film thickness (nm) |
| TiO2 | 43.74 |
| Ag | 39.21 |
| SiO2 | 45.25 |
| TiO2 | 38.28 |
| SiO2 | 45.36 |
| TiO2 | 30.48 |
| SiO2 | 46.9 |
| Ag | 20.05 |
| SiO2 | 2.39 |
| TiO2 | 41.25 |
| SiO2 | 56.81 |
| Ag | 22.77 |
TABLE 2 specific materials and thicknesses of the sublayers in the phase-change layer
As shown in fig. 2, the transmittance spectrum of the filter layer in table 1 is shown, in which the abscissa is Wavelength and is represented by Wavelength, and the ordinate is transmittance and is represented by Transmission. As shown in fig. 3 and 4, reflectance spectra of the phase change layer in table 2 in the amorphous state and the crystalline state are shown, respectively, where the abscissa is Wavelength and is represented by wavelengh, and the ordinate is reflectance and is represented by Reflectivity. As shown in fig. 5, the reflectance spectrum obtained by superimposing the filter layer in table 1 and the phase change layer in table 2 is shown, where the abscissa is Wavelength and is represented by Wavelength, the ordinate is Intensity and is represented by Intensity (since the reflectance change is small, it is difficult to distinguish the reflectance directly in the figure, and the Intensity is used for representation), a is the reflectance spectrum when the phase change layer is in an amorphous state, and B is the reflectance spectrum when the phase change layer is in a crystalline state.
In the present application, for example, the sub-pixels display blue light, a light transmission waveband of filter layer 40 in fig. 2 is 465nm to 470nm, a reflection waveband of phase change layer 50 in fig. 3 and 4 is also 465nm to 470nm, and both the transmittance spectrum and the reflectance spectrum have corresponding peak values. When the phase change layer 50 is converted from the amorphous state to the crystalline state, the wavelength corresponding to the reflectance peak is blue-shifted, that is, the wavelength becomes small.
The target color light 13 has a certain waveband, for example, 465nm to 470nm, when the phase change layer 50 is in an amorphous state, a peak reflectance value of the phase change layer 50 is equal to or relatively close to a wavelength corresponding to a peak transmittance value of the filter layer 40, and is recorded as a first wavelength, when light of the target color light is reflected by the phase change layer 50, the reflectance of the first wavelength is the highest, when the filter layer 40 continues to be transmitted, the transmittance of the first wavelength is also the highest, and after the light of the first wavelength passes through the phase change layer 50 and the filter layer 40, the whole of the two film layers has the first peak reflectance value for the first wavelength.
When the phase change layer 50 is in the crystalline state, since the wavelength corresponding to the reflectivity peak is blue-shifted, that is, the wavelength is reduced, and the wavelengths corresponding to the reflectivity peak and the transmittance peak are not equal and have a certain difference, it is noted that the wavelength corresponding to the reflectivity peak is the first wavelength, and the wavelength corresponding to the reflectivity peak is the second wavelength, when the light of the target color light is reflected by the phase change layer 50, the reflectivity of the second wavelength is the highest, and the reflectivity of the first wavelength is reduced, when the filter layer 40 continues to be transmitted, although the transmissivity of the first wavelength is the highest, since the reflected light of the first wavelength is reduced, even if the high transmissivity is maintained, the second reflectivity peak of the whole two film layers for the first wavelength is also reduced relative to the first reflectivity peak.
Therefore, by adjusting the amorphous state and the crystalline state of the phase change layer 50, the reflectivity peak value in the reflectivity spectrum of the whole two film layers can be changed, and for other wavelengths in the reflectivity spectrum, the corresponding reflectivity also has the same trend, namely the reflection light intensity is changed, thereby realizing the adjustment of the gray scale. In each state between the amorphous to crystalline states, the reflected light intensity is located between the two.
It should be noted that, the above embodiment only shows one setting mode of the phase change layer, but the present application is not limited thereto, and the material, thickness, setting position, number of setting layers, and the like of each sub auxiliary layer of the phase change material layer in the phase change layer can be set as required.
An embodiment of the present application further provides a display device, including the display panel and the driving chip described in any one of the above, where the driving chip provides a driving voltage for the display panel. The display device can be a smart watch, a tablet Computer, a notebook Computer, a Personal Computer (PC), a micro processing box and other devices with a display function, and can realize ultrahigh refresh frequency.
According to the above embodiments:
the application provides a display panel and a display device, the display panel comprises a plurality of sub-pixels, each sub-pixel comprises a collimation light source, a semi-permeable and semi-reflective layer, a filter layer and a phase change layer, the collimation light source is used for emitting collimation light to a first direction, the semi-permeable and semi-reflective layer is positioned on a propagation path of the collimation light and is used for reflecting at least part of the collimation light along a second direction to obtain reflection light, the second direction is not parallel to the first direction, the filter layer is positioned on the propagation path of the reflection light and is used for transmitting part of the reflection light to the second direction to obtain target color light, the wave band of the target color light is positioned in the transmission wave band of the filter layer, the light incident surface of the phase change layer corresponds to the light emergent surface of the filter layer, the reflection wave band of the phase change layer is positioned in the transmission wave band range of the filter layer and is used for reflecting the target color light to the semi-permeable and semi-reflective layer along a third direction, and the third direction are opposite to the second direction, the transflective layer is further used for transmitting at least part of target color light along a third direction, wherein when the phase change layer is electrified, the reflected light intensity of the target color light changes along with the change of the driving voltage, so that the sub-pixels display gray scales corresponding to the driving voltage, and the response time of the phase change layer is in a nanosecond level. In the display panel of this application, the accessible adjusts the reflection wave band that sees through the wave band and the phase change layer of filter layer and shows required target chromatic light, realizes different greyscales through inputing different drive voltage to the phase change layer to display panel's display function has been realized, and because the response time of phase change layer is the nanosecond level, has promoted an order of magnitude for the millisecond response of liquid crystal, consequently can realize the superelevation frequency of refreshing.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
The display panel and the display device provided by the embodiments of the present application are described in detail above, and the principles and embodiments of the present application are explained herein by applying specific examples, and the description of the embodiments above is only used to help understand the technical solutions and the core ideas of the present application; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the present disclosure as defined by the appended claims.
Claims (10)
1. A display panel comprising a plurality of sub-pixels, the sub-pixels comprising:
the collimation light source is used for emitting collimation light to the first direction;
the semi-transparent semi-reflective layer is positioned on a propagation path of the collimated light rays and used for reflecting at least part of the collimated light rays along a second direction to obtain reflected light rays, and the second direction is not parallel to the first direction;
the filter layer is positioned on the propagation path of the reflected light and used for transmitting part of the reflected light to the second direction to obtain target colored light, and the waveband of the target colored light is positioned in the transmission waveband of the filter layer;
the incident surface of the phase change layer corresponds to the emergent surface of the filter layer, the reflection waveband of the phase change layer is located within the range of the transmission waveband of the filter layer and is used for reflecting the target color light to the semi-transparent and semi-reflective layer along a third direction, the third direction is opposite to the second direction, and the semi-transparent and semi-reflective layer is also used for transmitting at least part of the target color light along the third direction;
when the phase change layer is electrified, the reflected light intensity of the target color light changes along with the change of the driving voltage, so that the sub-pixels display gray scales corresponding to the driving voltage, and the response time of the phase change layer is in a nanosecond level.
2. The display panel of claim 1, wherein the phase change layer comprises a plurality of phase change material layers and a plurality of auxiliary layers, the plurality of phase change material layers and the plurality of auxiliary layers being alternately stacked, the auxiliary layers having a different refractive index from the phase change material layers.
3. The display panel of claim 2, wherein the phase change material layer has a first refractive index when in an amorphous state and a second refractive index when in a crystalline state, the first refractive index being different from the second refractive index, the phase change material layer having a refractive index that varies between the first refractive index and the second refractive index when energized.
4. The display panel of claim 3, wherein the auxiliary layer comprises at least one sub-auxiliary layer, and refractive indices of adjacent sub-auxiliary layers are different.
5. The display panel according to claim 4, wherein a material of the sub auxiliary layer includes silicon dioxide, titanium dioxide, or silver.
6. The display panel of claim 3, wherein the thickness of each film layer in the phase change layer is different.
7. The display panel of claim 1, wherein the display panel comprises a plurality of types of sub-pixels, and the filter layer corresponding to each type of sub-pixel has a different transmission wavelength band, so that each type of sub-pixel displays different colors.
8. The display panel according to claim 1, wherein the filter layer includes a plurality of sub-filter layers arranged in a stack, and refractive indices of adjacent two sub-filter layers are different.
9. The display panel of claim 1, wherein the collimated light source comprises a white light source and a collimating lens positioned in an exit light path of the white light source.
10. A display device comprising the display panel according to any one of claims 1 to 9 and a driver chip.
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