CN114428417B - Display panel and display device - Google Patents
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- CN114428417B CN114428417B CN202210052270.1A CN202210052270A CN114428417B CN 114428417 B CN114428417 B CN 114428417B CN 202210052270 A CN202210052270 A CN 202210052270A CN 114428417 B CN114428417 B CN 114428417B
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- 230000008859 change Effects 0.000 claims abstract description 58
- 230000005540 biological transmission Effects 0.000 claims abstract description 31
- 230000004044 response Effects 0.000 claims abstract description 13
- 239000012782 phase change material Substances 0.000 claims description 27
- 239000000463 material Substances 0.000 claims description 14
- 239000003086 colorant Substances 0.000 claims description 8
- 241001270131 Agaricus moelleri Species 0.000 claims description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 6
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 3
- 238000002425 crystallisation Methods 0.000 claims description 3
- 230000008025 crystallization Effects 0.000 claims description 3
- 235000012239 silicon dioxide Nutrition 0.000 claims description 3
- 239000000377 silicon dioxide Substances 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
- 230000003287 optical effect Effects 0.000 claims description 2
- 239000004973 liquid crystal related substance Substances 0.000 description 11
- 238000000985 reflectance spectrum Methods 0.000 description 9
- 238000002834 transmittance Methods 0.000 description 9
- 238000002310 reflectometry Methods 0.000 description 8
- 229910004298 SiO 2 Inorganic materials 0.000 description 5
- 229910010413 TiO 2 Inorganic materials 0.000 description 4
- 239000013078 crystal Substances 0.000 description 4
- 235000009537 plain noodles Nutrition 0.000 description 4
- 230000006872 improvement Effects 0.000 description 3
- 238000001228 spectrum Methods 0.000 description 3
- 238000000411 transmission spectrum Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
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- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
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Classifications
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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 display device, in every sub-pixel of display panel, the collimation light source is arranged in to first direction emission collimation light, semi-transparent semi-reflection layer is used for obtaining the reflection light with at least partly collimation light along the reflection of second direction, the filter layer is used for obtaining target color light to the partial reflection light of second direction transmission, the wave band of target color light is located the transmission wave band of filter layer, the reflection wave band of phase change layer is located the transmission wave band scope of filter layer, be used for with target color light along the third direction reflection to semi-transparent semi-reflection layer, the third direction is opposite with the second direction, semi-transparent semi-reflection layer still is used for permeating at least part target color light along the third direction, when the phase change layer circular telegram, the reflection light intensity of target color light changes along with the change of drive voltage, so that the sub-image shows the gray scale that corresponds with drive voltage, the response time of phase change layer is nanosecond. The display panel can realize ultrahigh refresh frequency.
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
With the continuous improvement of communication capability, the requirements of people on display refresh frequency are also increasing. For a 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 the refresh frequency is required to be higher, a higher requirement is put on the response time of the liquid crystal, but because of the characteristics of the liquid crystal, the response time is usually only on the millisecond level, so that the improvement of the refresh frequency is limited, and the liquid crystal display panel with the 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 improvement is required.
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 ultrahigh refresh frequency cannot be realized by the existing liquid crystal display panel.
The application provides a display panel, including a plurality of sub-pixels, the sub-pixel includes:
a collimated light source for emitting collimated light rays in a first direction;
the semi-transparent and semi-reflective layer is positioned on the propagation path of the collimated light and is used for reflecting at least part of the collimated light along a second direction to obtain reflected light, 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 is used for transmitting part of the reflected light to the second direction to obtain target color light, and the wave band of the target color light is positioned in the transmission wave band of the filter layer;
the reflection wave band of the phase change layer is positioned in the transmission wave band range of the optical filter layer and is used for reflecting the target color light to the semi-transparent semi-reflection layer along a third direction, the third direction is opposite to the second direction, and the semi-transparent semi-reflection 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 reflection light intensity of the target color light changes along with the change of the driving voltage, so that the display panel displays gray scales corresponding to the driving voltage, and the response time of the phase-change layer is nanosecond.
In one embodiment, the phase change layer includes a plurality of phase change material layers and a plurality of auxiliary layers alternately stacked, the auxiliary layers having a refractive index different from that of the phase change material layers.
In one embodiment, the phase change material layer has a first refractive index in an amorphous state and a second refractive index 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.
In an embodiment, the auxiliary layer comprises at least one sub-auxiliary layer, the refractive indices of adjacent sub-auxiliary layers being different.
In one embodiment, the material of the sub-auxiliary layer comprises 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 a plurality of types of sub-pixels, and the transmission wavelength bands of the filter layers corresponding to the sub-pixels are different, so that the sub-pixels of each type display different colors.
In one embodiment, the filter layer includes a plurality of sub-filter layers stacked, and the refractive indices of two adjacent sub-filter layers are different.
In one embodiment, the collimated light source includes a white light source and a collimating lens positioned in a light path of the white light source.
The embodiment of the application also provides a display device, which comprises the display panel and the driving chip.
The beneficial effects are that: the application provides a display panel and display device, the display panel includes a plurality of sub-pixels, every sub-pixel includes the collimation light source, semi-transparent half reflection layer, filter layer and phase change layer, the collimation light source is used for to the first direction transmission light, semi-transparent half reflection layer is located the propagation path of collimation light, be used for following the second direction reflection with at least partial collimation light, obtain reflected light, the second direction is nonparallel with first direction, the filter layer is located the propagation path of reflected light, be used for to the second direction transmission partial reflection light, obtain the target chromatic light, the wave band of target chromatic light is located the transmission wave band of filter layer, the income plain noodles of phase change layer corresponds with the play plain noodles of filter layer, the reflection wave band of phase change layer is located the transmission wave band range of filter layer, be used for with target chromatic light follow the third direction reflection to semi-transparent half reflection layer, the third direction is opposite with the second direction, semi-transparent half reflection layer still is used for following the third direction transmission at least partial target chromatic light, wherein, when the phase change layer circular telegram, the reflection of target chromatic light follows the variation of drive voltage, make sub-pixel shows the grey level response time nanosecond layer that corresponds with drive voltage. In the display panel of the application, required target color light can be displayed by adjusting the transmission wave band of the filter layer and the reflection wave band of the phase-change layer, different gray scales are realized by inputting different driving voltages to the phase-change layer, so that the display function of the display panel is realized, and the response time of the phase-change layer is nanosecond, and one order of magnitude is promoted relative to millisecond response of liquid crystal, so that ultrahigh refresh frequency can be realized.
Drawings
Technical solutions and other advantageous effects of the present application will be made apparent from the following detailed description of specific embodiments of the present application with reference to 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 application.
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 the crystalline state.
Fig. 5 is a reflectance spectrum of the filter layer of table 1 and the phase change layer of table 2 after being superimposed.
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 will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
In the description of the present application, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," etc. indicate or are based on the orientation or positional relationship shown in the drawings, merely for convenience of description and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically connected, electrically connected or can be communicated with each other; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.
In this application, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, and may also include the first and second features not being in direct contact but being in contact with each other by way of additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
The following disclosure provides many different embodiments or examples for implementing different structures of the present application. In order to simplify the disclosure of the present application, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present application. Furthermore, the present application may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and which do not in themselves indicate the relationship between the various embodiments and/or arrangements discussed. In addition, the present application provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize the application of other processes and/or the 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 ultrahigh refresh frequency cannot be realized by the existing liquid crystal display panel.
As shown in fig. 1, the present application provides a display panel, including a plurality of sub-pixels, each sub-pixel includes a collimation light source, a semi-transparent and semi-reflective layer 30, a filter layer 40 and a phase change layer 50, the collimation light source is used for emitting collimation light 11 towards a first direction X, the semi-transparent and semi-reflective layer 30 is located on a propagation path of the collimation light 11, and is used for reflecting at least part of the collimation light 11 along a second direction Y1 to obtain reflection 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 reflection light 12, and is used for transmitting part of the reflection light 12 towards the second direction Y1 to obtain target color light, a wave band of the target color light is located in a transmission wave band of the filter layer 40, a light incident surface of the phase change layer 50 corresponds to a light emergent surface of the filter layer 40, the reflection wave band of the phase change layer 50 is located in a transmission wave band range of the filter layer 40, and is used for reflecting the target color light 13 towards the semi-transparent and semi-reflective layer 30 along a third direction Y2, the third direction Y2 is opposite to the second direction Y1, the semi-transparent and semi-reflective layer 30 is also used for transmitting at least part of the target color light 12 along the third direction Y2, wherein when the target color light 13 passes through the second direction Y1, the filter layer and the phase change layer 50 corresponds to a voltage, and the phase change layer 50 changes with a phase change stage, when the phase change layer is driven, and the phase change display stage is changed, and the display stage is corresponding to a display stage.
The collimated light source includes a white light source 10 and a collimator lens 20 positioned in the light-emitting path of the white light source 10. The white light source 10 emits white light, which includes color light of various colors, such as red light, blue light, green light, etc., and the wavelength bands of the light corresponding to the various colors are different. The white light emitted from the white light source 10 has divergence, and the distance between the light rays gradually increases as the propagation distance increases, and the collimating lens 20 is disposed on a certain light-emitting path of the white light source 10, so that the white light rays passing through the collimating lens 20 become collimated light rays, that is, are parallel to each other. By the arrangement, the collimated light can be emitted to the semi-transparent and semi-reflective layer 30 in a uniform direction, so that the direction of the reflected light is uniform, different incidence angles of the light are prevented from influencing the reflection angle, and the final display effect is disturbed.
The transflective layer 30 has a characteristic of being semi-transmissive and semi-reflective, that is, one beam of light is irradiated onto the transflective layer 30, a part of the light can pass through the transflective layer 30, and another part of the light is reflected on the incident surface of the transflective layer 30. Therefore, when the collimated light 11 irradiates onto the transflective layer 30 along the first direction X, a part of the collimated light 11 is reflected along the second direction Y1 to obtain the reflected light 12. In this 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 light reflection principle, the incident angle is equal to the reflection angle, so that the transflective layer 30 is obliquely disposed. Specifically, the inclination angle of the transflective layer 30 with respect to the second direction Y1 may be set to 45 degrees, and at this time, the first direction X is the horizontal direction, and the incident angle and the reflection angle are both 45 degrees. Alternatively, the inclination angle of the transflective layer 30 with respect to the second direction Y1 may be set to another angle as long as it is ensured that the reflected light 12 can be incident on the filter layer 40 along the specified second direction Y1.
The filter layer 40 has a characteristic of transmitting only light in certain wavelength bands, and the light in the wavelength bands can be controlled by setting the material of the filter layer 40, which is referred to as a transmission wavelength band in the embodiment of the present application, and light outside the transmission wavelength band can be regarded as being unable to be transmitted due to very low transmittance. The reflected light 12 is still white light, and when the light irradiates the filter layer 40, only the light in the transmission band of the filter layer 40 can transmit and irradiate the phase-change layer 50, and the light in other bands is prevented from transmitting, so that the target color light 13 finally irradiated to the phase-change layer 50 is color light with a single color, such as red color light, blue color light or green color light.
The phase change layer 50 has the property of reflecting only light in certain wavelength bands, and the wavelength band that the phase change layer 50 material can reflect can be controlled by setting it, which is referred to as a reflection band in the embodiment of the present application, and light outside the reflection band can be regarded as being unable to be reflected due to the very low reflectivity. The reflection band is located in the transmission band range of the filter layer 40, so that all or part of the target color light 13 can be reflected into 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, and 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 a driving voltage, when the driving voltage is small, the temperature of the phase change material can rise to a temperature interval below a melting temperature above a crystallization temperature, and crystal lattices are orderly arranged to form crystals, so that the amorphous state is switched to the crystalline state; conversely, when a larger driving voltage is applied, the temperature of the phase change material is increased to be higher than the melting temperature, so that the order of the crystal lattice is destroyed, and the crystal is switched from the crystalline state to the amorphous state. The phase change layer 50 can be reversibly switched between crystalline and amorphous states by varying the magnitude, duration, etc. of the driving voltage. When the state of the phase change layer 50 changes, the refractive index thereof also changes, so that the reflected light intensity changes.
The phase-change layer 50 and the filter layer 40 cooperate with each other through the reflection band and the passing band, so that the target color light 13 reflected to the semi-transparent and semi-reflective layer 30 only includes light of a certain band, and therefore only can display colors of the band, and when different driving voltages are input, the refractive index of the phase-change layer 50 changes, so that the reflected light intensity of the reflected target color light 13 can be different, and corresponding sub-pixels can display gray scales corresponding to the target color light 13. In addition, when the phase change material is switched between the amorphous state and the crystalline state, the response time is nanosecond, namely the state switching can be completed in nanosecond time, so that the gray level switching time is nanosecond, and compared with the millisecond response of liquid crystal, the gray level switching time is improved by one order of magnitude, and therefore the ultrahigh refresh frequency can be realized.
In one embodiment, the display panel includes a plurality of types of sub-pixels, and the transmission wavelength bands of the filter layer 40 corresponding to the sub-pixels are different, so that the sub-pixels of each type display different colors. For each sub-pixel, the above structures are adopted to obtain the target color light 13 of one color, 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 band and the reflection wave band corresponding to different types of sub-pixels different, so that the sub-pixels respectively display different colors, such as red, green and blue, then the red sub-pixel, the green sub-pixel and the 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 electrified, the refractive index of the phase change material layer will change, while the refractive index of the auxiliary layer is fixed and will not change, and through stacking a plurality of film layers with different refractive indexes, the target color light 13 is refracted for multiple times at the interface of the plurality of film layers, so that the control of the reflection spectrum in the usable state can be increased, and the finally required reflection light intensity can be obtained.
The phase change material layer has a first refractive index in an amorphous state and a second refractive index in a crystalline state, the first refractive index being different from the second refractive index, and the refractive index of the phase change material layer changes between the first refractive index and the second refractive index when the phase change material layer is energized. When the phase change layer 50 inputs a driving voltage, each phase change material layer is switched between a completely crystalline state and a completely amorphous state, and can be mixed in different proportion according to the magnitude of the driving voltage, for example, the phase change material layer is 30% crystalline and 70% amorphous, and according to the different proportion of the crystalline state to the amorphous state, the corresponding refractive indexes are different, and from the completely crystalline state and the completely amorphous state, a plurality of phase change material layers with different crystallization degrees 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 indices of adjacent sub-auxiliary layers being different. The sub-auxiliary layers with different refractive indexes have different extinction coefficients, so that the controllability of the reflected light intensity can be further improved when the sub-auxiliary layers are stacked together, and finally the required reflected 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 thickness of each film layer in the phase change layer is not equal. By stacking multiple film layers of different thickness, the reflectance spectrum can be made to reach or approach the desired ideal state.
The adjustment of the intensity of the reflected light is reflected by the wavelength difference between the reflectance peak and the transmittance peak. The working principles of the filter layer and the phase change layer are described below with reference to specific numerical values. The filter layer 40 and the phase change layer 50 in the present application each comprise a plurality of layers arranged in a stacked manner, as shown in Table 1, showing the specific materials and thicknesses of each sub-filter layer in the filter layer, as shown in Table 2, showing the specific materials and thicknesses of each layer in the phase change layer, wherein SB 2 S 3 The layer is a phase change material layer, two adjacent SB 2 S 3 The film layer between the layers is an auxiliary layer, siO 2 The layers and Ag layers are sub-auxiliary layers in the auxiliary layers.
TABLE 1 specific materials and thicknesses of the sublayers in the filter layer
| Film material | Film thickness (nm) |
| TiO 2 | 43.74 |
| Ag | 39.21 |
| SiO 2 | 45.25 |
| TiO 2 | 38.28 |
| SiO 2 | 45.36 |
| TiO 2 | 30.48 |
| SiO 2 | 46.9 |
| Ag | 20.05 |
| SiO 2 | 2.39 |
| TiO 2 | 41.25 |
| SiO 2 | 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 with the abscissa representing the Wavelength, and the ordinate representing the transmittance, the Transmission. As shown in fig. 3 and 4, the reflectance spectra of the phase change layer in table 2 in the amorphous and crystalline states, respectively, are shown with the abscissa representing Wavelength, and the ordinate representing reflectance, and reflectance. As shown in fig. 5, the reflectance spectrum of the filter layer in table 1 and the phase-change layer in table 2 after being superimposed is shown in Wavelength on the abscissa, and is shown by Wavelength, intensity on the ordinate, and is shown by transmittance (since the value of the reflectance change is small, it is difficult to distinguish the values directly from the figure by reflectance, and therefore, the value of the reflectance is shown by Intensity, and the value of the reflectance is proportional to the value of the Intensity), a is shown as the reflectance spectrum when the phase-change layer is amorphous, and B is shown as the reflectance spectrum when the phase-change layer is crystalline.
In this application, taking blue light as an example of the display of the sub-pixel, the light transmission band of the filter layer 40 in fig. 2 is 465nm to 470nm, the reflection band of the phase-change layer 50 in fig. 3 and 4 is 465nm to 470nm, and the transmittance spectrum and the reflectance spectrum have corresponding peaks. When the phase change layer 50 is changed from the amorphous state to the crystalline state, the wavelength corresponding to the reflectance peak is blue-shifted, that is, the wavelength becomes smaller.
The target color light 13 has a certain wavelength band, for example 465nm to 470nm, when the phase change layer 50 is amorphous, the reflectivity peak value of the phase change layer 50 is equal to or relatively close to the wavelength corresponding to the transmittance peak value of the filter layer 40, and is denoted as a first wavelength, when the light of the target color light is reflected by the phase change layer 50, the reflectivity of the first wavelength is highest, when the light continuously passes through the filter layer 40, the transmittance of the first wavelength is also 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 reflectivity peak value for the first wavelength.
When the phase change layer 50 is crystalline, the wavelength corresponding to the reflectance peak is blue shifted, that is, the wavelength becomes smaller, the wavelength corresponding to the reflectance peak is not equal to the wavelength corresponding to the transmittance peak and has a certain difference, the wavelength corresponding to the transmittance peak is the first wavelength, the wavelength corresponding to the reflectance peak is the second wavelength, when the light of the target color light is reflected by the phase change layer 50, the reflectance of the second wavelength is the highest, and when the reflectance of the first wavelength is lowered, the light of the first wavelength is the highest while continuing to transmit through the filter layer 40, the reflected light of the first wavelength is lowered, and even if the transmittance is kept high, the second reflectance peak of the whole of the two film layers for the first wavelength is lowered relative to the first reflectance peak.
Therefore, by adjusting the amorphous state and the crystalline state of the phase-change layer 50, the reflectivity peak value in the overall reflectivity spectrum of the two film layers can be changed, and for other wavelengths in the reflectivity spectrum, the corresponding reflectivity also changes in the same trend, namely the reflected light intensity changes, so that the gray scale adjustment is realized. In each state between amorphous and crystalline, the reflected light intensity lies between the two.
It should be noted that, the above embodiment only shows one arrangement mode of the phase-change layer, but the application is not limited to this, and the materials, thicknesses, arrangement positions, arrangement layers and the like of each sub-auxiliary layer of the phase-change material layer in the phase-change layer can be set according to the needs.
The embodiment of the application also provides a display device, which comprises the display panel and the driving chip, wherein the driving chip provides driving voltage for the display panel. The display device may be a device with a display function such as a smart watch, a tablet computer, a notebook computer, a personal computer (PC, personal Computer), a micro processing box, or the like, and may implement an ultra-high refresh frequency.
As can be seen from the above embodiments:
the application provides a display panel and display device, the display panel includes a plurality of sub-pixels, every sub-pixel includes the collimation light source, semi-transparent half reflection layer, filter layer and phase change layer, the collimation light source is used for to first direction emission collimation light, semi-transparent half reflection layer is located the propagation path of collimation light, be used for following the reflection of second direction with at least part collimation light, obtain reflection light, the second direction is nonparallel with first direction, the filter layer is located the propagation path of reflection light, be used for to the transmission of second direction partial reflection light, obtain the target chromatic light, the wave band of target chromatic light is located the transmission wave band of filter layer, the income plain noodles of phase change layer corresponds with the play plain noodles of filter layer, the reflection wave band of phase change layer is located the transmission wave band range of filter layer, be used for with target chromatic light follow the third direction reflection to semi-transparent half reflection layer, the semi-transparent half reflection layer still is used for following the transmission of at least part target chromatic light of third direction, wherein, when the phase change layer circular telegram, the reflection of target chromatic light follows the variation of drive voltage, so that sub-pixel shows the grey scale response time that corresponds with drive voltage, the phase change layer's time nanosecond. In the display panel of the application, required target color light can be displayed by adjusting the transmission wave band of the filter layer and the reflection wave band of the phase-change layer, different gray scales are realized by inputting different driving voltages to the phase-change layer, so that the display function of the display panel is realized, and the response time of the phase-change layer is nanosecond, and one order of magnitude is promoted relative to millisecond response of liquid crystal, so that ultrahigh refresh frequency can be realized.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to related descriptions of other embodiments.
The foregoing has described in detail a display panel and a display device provided by embodiments of the present application, and specific examples have been applied herein to illustrate the principles and embodiments of the present application, where the foregoing examples are only for helping to understand the technical solutions and core ideas of the present application; those of ordinary skill in the art will appreciate that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.
Claims (7)
1. A display panel comprising a plurality of sub-pixels, each sub-pixel comprising:
a collimated light source for emitting collimated light rays in a first direction;
the semi-transparent and semi-reflective layer is positioned on the propagation path of the collimated light and is used for reflecting at least part of the collimated light along a second direction to obtain reflected light, 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 is used for transmitting part of the reflected light to the second direction to obtain target color light, and the wave band of the target color light is positioned in the transmission wave band of the filter layer;
the reflection wave band of the phase change layer is positioned in the transmission wave band range of the optical filter layer and is used for reflecting the target color light to the semi-transparent semi-reflection layer along a third direction, the third direction is opposite to the second direction, and the semi-transparent semi-reflection layer is also used for transmitting at least part of the target color light along the third direction; the phase change layer and the filter layer are matched with each other through the reflection wave band and the transmission wave band, so that the target color light reflected to the semi-transparent and semi-reflective layer only comprises light rays of a certain wave band, and the sub-pixel can only display the color of the wave band;
when the phase-change layer is electrified, the reflection 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;
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 are alternately stacked, the auxiliary layers are different from the phase change material layers in refractive index, the auxiliary layers comprise at least one sub-auxiliary layer, and the refractive indexes of adjacent sub-auxiliary layers are different;
when the phase-change layer inputs driving voltage, a plurality of phase-change material layers with different crystallization degrees are obtained by controlling the driving voltage, each phase-change material layer is switched between a complete crystalline state and a complete amorphous state and can pass through a mixed state of an intermediate crystalline state and an amorphous state, and the mixing of phase states with different proportions can be realized according to the different sizes of the driving voltage;
the thickness of each film layer in the phase change layer is different.
2. The display panel of claim 1, wherein the phase change material layer has a first refractive index in an amorphous state and a second refractive index 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 changes between the first refractive index and the second refractive index when energized.
3. The display panel of claim 1, wherein the material of the sub-auxiliary layer comprises silicon dioxide, titanium dioxide, or silver.
4. The display panel of claim 1, wherein the display panel comprises a plurality of types of sub-pixels, and the filter layers corresponding to the sub-pixels of each type have different transmission bands so that the sub-pixels of each type display different colors.
5. The display panel of claim 1, wherein the filter layer comprises a plurality of sub-filter layers stacked, and refractive indices of adjacent two sub-filter layers are different.
6. The display panel of claim 1, wherein the collimated light source comprises a white light source and a collimating lens positioned in a light path of the white light source.
7. A display device comprising the display panel of any one of claims 1 to 6 and a driver chip.
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| JP2007322756A (en) * | 2006-06-01 | 2007-12-13 | Fuji Xerox Co Ltd | Optical modulation element and its driving method |
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| CN110568692A (en) * | 2019-08-30 | 2019-12-13 | 华中科技大学 | Display device based on phase-change material and quantum dots |
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| KR20200072090A (en) * | 2018-12-12 | 2020-06-22 | 한국과학기술원 | Display Device Using Two-Dimensional Phase Transition Material And Manufacturing Method Thereof |
| KR20210017373A (en) * | 2019-08-08 | 2021-02-17 | 엘지디스플레이 주식회사 | Wavelength control film and display device |
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| JP2007322756A (en) * | 2006-06-01 | 2007-12-13 | Fuji Xerox Co Ltd | Optical modulation element and its driving method |
| CN106158898A (en) * | 2016-07-15 | 2016-11-23 | 浙江大学 | Non-volatile pixel cell based on interference effect |
| CN107942540A (en) * | 2017-12-14 | 2018-04-20 | 中国科学院光电技术研究所 | Phase-change-material-based optical modulation device with dynamic color display and preparation method thereof |
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