CN109817688B - Organic light-emitting display panel, preparation method thereof and display device - Google Patents
Organic light-emitting display panel, preparation method thereof and display device Download PDFInfo
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Abstract
The invention provides an organic light-emitting display panel, a preparation method thereof and a display device. Because each sub-pixel region can emit two monochromatic lights with different colors along the two sides of the organic light-emitting display panel, the double-sided display of the organic light-emitting display panel with different colors can be realized by adjusting the light-emitting colors of each sub-pixel region along the two sides of the organic light-emitting display panel; moreover, the light emitted from the two sides of the organic light-emitting display panel is subjected to real-time phase modulation through the first phase modulation structure and the second phase modulation structure, so that double-sided dynamic holographic display of the organic light-emitting display panel can be realized; in addition, the invention can realize double-sided dynamic holographic display by adopting one organic light-emitting display panel, thereby having low cost, small volume, low power consumption and beautiful appearance.
Description
Technical Field
The invention relates to the technical field of display, in particular to an organic light-emitting display panel, a preparation method thereof and a display device.
Background
Organic electroluminescent Display (OLED) panels have advantages of self-luminescence, fast response, wide viewing angle, high brightness, bright color, lightness and thinness, and are one of the hot spots in the research field of displays at present, and are considered as next generation Display technologies.
Currently, most of the OLED display panels in the market mainly display on a single side, but in some special occasions, users desire the display to have a double-side display effect. Such as exhibitions with large spaces, the exhibitor wants to have video playback of the articles and techniques on both sides of the display. Under this situation, traditional double-sided display mostly is with two display panel relative placement, makes double-sided display's both sides be provided with a display panel respectively, like this, can reach double-sided display's effect, but its essence is with the display panel stack of two single faces, and it is not only the expense higher, and occupation space is big moreover, the consumption is high, also pleasing to the eye, and can not satisfy the demand.
Disclosure of Invention
The embodiment of the invention provides an organic light-emitting display panel, a preparation method thereof and a display device, which are used for realizing double-sided display and have the advantages of low cost, small volume and low power consumption.
Therefore, an embodiment of the present invention provides an organic light emitting display panel, including a first substrate and a second substrate that are disposed opposite to each other, and a plurality of sub-pixel regions located between the first substrate and the second substrate, where each sub-pixel region includes a first phase modulation structure, a first organic light emitting field effect transistor, a second organic light emitting field effect transistor, and a second phase modulation structure that are sequentially stacked; wherein the content of the first and second substances,
the first organic light emitting field effect transistor is used for emitting monochromatic light with a first wavelength to the first phase modulation structure, the second organic light emitting field effect transistor is used for emitting monochromatic light with a second wavelength to the second phase modulation structure, and the color of the monochromatic light with the first wavelength is different from that of the monochromatic light with the second wavelength;
the first phase modulation structure is used for performing phase modulation on the received monochromatic light with the first wavelength, reflecting the received monochromatic light with the first wavelength to the second phase modulation structure, and emitting monochromatic light with the second wavelength after the monochromatic light with the second wavelength is subjected to phase modulation by the second phase modulation structure;
the second phase modulation structure is used for performing phase modulation on the received monochromatic light with the second wavelength, reflecting the received monochromatic light with the second wavelength to the first phase modulation structure, and emitting the monochromatic light with the first wavelength after the monochromatic light with the first wavelength is subjected to phase modulation by the first phase modulation structure.
Optionally, in a specific implementation manner, in the organic light emitting display panel provided in the embodiment of the present invention, the first phase modulation structure includes: the first photonic crystal layer, the first dielectric layer and the first sub-wavelength grating are sequentially stacked and arranged between the first substrate and the first organic light-emitting field effect transistor and on one side of the first substrate back to; wherein the content of the first and second substances,
the first sub-wavelength grating is used for transmitting the monochromatic light with the first wavelength and the monochromatic light with the second wavelength, the first dielectric layer is used for modulating the phase of the monochromatic light with the first wavelength, and the first photonic crystal layer only allows the monochromatic light with the second wavelength to penetrate through.
Optionally, in practical implementation, in the organic light emitting display panel provided in the embodiment of the present invention, the second phase modulation structure includes: the second photonic crystal layer, the second dielectric layer and the second sub-wavelength grating are sequentially arranged between the second substrate and the second organic light-emitting field effect transistor in a laminated manner and on one side, back to the second substrate; wherein the content of the first and second substances,
the second sub-wavelength grating is used for transmitting the monochromatic light with the first wavelength and the monochromatic light with the second wavelength, the second dielectric layer is used for modulating the phase of the monochromatic light with the second wavelength, and the second photonic crystal layer only allows the monochromatic light with the first wavelength to penetrate through.
Optionally, in a specific implementation manner, in the organic light emitting display panel provided in the embodiment of the present invention, each of the first sub-wavelength grating and the second sub-wavelength grating includes a plurality of grating bars arranged at intervals, and a grating gap existing between two adjacent grating bars; the width of the grating strips and the width of the grating gaps are a grating period, and the first sub-wavelength grating and the second sub-wavelength grating can transmit monochromatic light with the first wavelength and monochromatic light with the second wavelength by adjusting the grating period or the width of the grating gaps.
Optionally, in a specific implementation manner, in the organic light emitting display panel provided in the embodiment of the present invention, both the first dielectric layer and the second dielectric layer are electro-optic crystals.
Optionally, in a specific implementation manner, in the organic light emitting display panel provided in the embodiment of the present invention, the first organic light emitting field effect transistor includes a first source electrode, a first drain electrode, a first organic light emitting layer, and a first gate electrode, which are located on a side of the first phase modulation structure facing the second substrate; the second organic light emitting field effect transistor comprises a second source electrode, a second drain electrode, a second organic light emitting layer and a second grid electrode which are positioned on one side, facing the first substrate, of the second phase modulation structure.
Optionally, in a specific implementation, in the organic light emitting display panel provided in the embodiment of the present invention, a cathode is further included between the first organic light emitting field effect transistor and the second organic light emitting field effect transistor, and the first organic light emitting field effect transistor and the second organic light emitting field effect transistor share the cathode.
Correspondingly, the embodiment of the invention also provides a display device which comprises the organic light-emitting display panel provided by the embodiment of the invention.
Correspondingly, an embodiment of the present invention further provides a method for manufacturing the organic light emitting display panel, including:
and sequentially manufacturing a first phase modulation structure, a first organic light-emitting field effect transistor, a second organic light-emitting field effect transistor and a second phase modulation structure which are arranged in a stacked manner on the first substrate.
Correspondingly, an embodiment of the present invention further provides a display method of the organic light emitting display panel provided by the embodiment of the present invention, including:
the first phase modulation structure performs phase modulation on the received monochromatic light with the first wavelength, reflects the received monochromatic light with the first wavelength to the second phase modulation structure, and emits monochromatic light with a second wavelength after the monochromatic light with the second wavelength is subjected to phase modulation by the second phase modulation structure;
the second phase modulation structure performs phase modulation on the received monochromatic light with the second wavelength, reflects the received monochromatic light with the second wavelength to the first phase modulation structure, and emits the monochromatic light with the first wavelength after the monochromatic light with the first wavelength is subjected to phase modulation by the first phase modulation structure.
The embodiment of the invention has the following beneficial effects:
in the organic light emitting display panel, the manufacturing method thereof and the display device provided by the embodiment of the invention, each sub-pixel region comprises a first phase modulation structure, a first organic light emitting field effect transistor, a second organic light emitting field effect transistor and a second phase modulation structure which are sequentially stacked; when displaying, the first organic light-emitting field effect transistor emits monochromatic light with a first wavelength to the first phase modulation structure, the second organic light-emitting field effect transistor emits monochromatic light with a second wavelength to the second phase modulation structure, and the monochromatic light with the first wavelength and the monochromatic light with the second wavelength are different in color; the first phase modulation structure performs phase modulation on the received monochromatic light with the first wavelength, reflects the received monochromatic light to the second phase modulation structure, and emits monochromatic light with the second wavelength after the monochromatic light is subjected to phase modulation by the second phase modulation structure; the second phase modulation structure performs phase modulation on the received monochromatic light with the second wavelength, reflects the received monochromatic light with the second wavelength to the first phase modulation structure, and emits the monochromatic light with the first wavelength after the monochromatic light with the first wavelength is subjected to phase modulation by the first phase modulation structure. Because each sub-pixel region can emit two monochromatic lights with different colors along the two sides of the organic light-emitting display panel, the double-sided display of the organic light-emitting display panel with different colors can be realized by adjusting the light-emitting colors of each sub-pixel region along the two sides of the organic light-emitting display panel; moreover, the light emitted from the two sides of the organic light-emitting display panel is subjected to real-time phase modulation through the first phase modulation structure and the second phase modulation structure, so that double-sided dynamic holographic display of the organic light-emitting display panel can be realized; in addition, the invention can realize double-sided dynamic holographic display by adopting one organic light-emitting display panel, thereby having low cost, small volume, low power consumption and beautiful appearance.
Drawings
Fig. 1 is a schematic structural diagram of an organic light emitting display panel according to an embodiment of the present invention;
fig. 2 is a second schematic structural diagram of an organic light emitting display panel according to an embodiment of the invention;
fig. 3 is a schematic structural diagram of a phase modulation structure according to an embodiment of the present invention;
fig. 4 is a structural diagram of an organic light emitting field effect transistor according to an embodiment of the present invention;
fig. 5A to 5P are schematic structural diagrams of the organic light emitting display panel shown in fig. 2 after steps are performed;
fig. 6 is a schematic structural diagram of a display device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the 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 invention.
The shapes and sizes of the various elements in the drawings are not to scale and are merely intended to illustrate the invention.
An organic light emitting display panel provided in an embodiment of the present invention, as shown in fig. 1, includes a first substrate 1 and a second substrate 2 that are oppositely disposed, and a plurality of sub-pixel regions located between the first substrate 1 and the second substrate 2, where each sub-pixel region includes a first phase modulation structure 3, a first organic light emitting field effect transistor 4, a second organic light emitting field effect transistor 5, and a second phase modulation structure 6 that are sequentially stacked; wherein the content of the first and second substances,
the first organic light emitting field effect transistor 4 is used for emitting monochromatic light with a first wavelength to the first phase modulation structure 3, the second organic light emitting field effect transistor 5 is used for emitting monochromatic light with a second wavelength to the second phase modulation structure 6, and the monochromatic light with the first wavelength and the monochromatic light with the second wavelength are different in color;
the first phase modulation structure 3 is used for performing phase modulation on the received monochromatic light with the first wavelength, reflecting the monochromatic light with the first wavelength to the second phase modulation structure 6, and emitting monochromatic light with the second wavelength after the monochromatic light with the second wavelength is subjected to phase modulation by the second phase modulation structure 6;
the second phase modulation structure 6 is configured to perform phase modulation on the received monochromatic light with the second wavelength, reflect the received monochromatic light with the second wavelength to the first phase modulation structure 3, and emit the monochromatic light with the first wavelength after the phase modulation by the first phase modulation structure 3.
In the organic light emitting display panel provided in the embodiment of the present invention, each sub-pixel region includes a first phase modulation structure, a first organic light emitting field effect transistor, a second organic light emitting field effect transistor, and a second phase modulation structure, which are sequentially stacked; when displaying, the first organic light-emitting field effect transistor emits monochromatic light with a first wavelength to the first phase modulation structure, the second organic light-emitting field effect transistor emits monochromatic light with a second wavelength to the second phase modulation structure, and the monochromatic light with the first wavelength and the monochromatic light with the second wavelength are different in color; the first phase modulation structure performs phase modulation on the received monochromatic light with the first wavelength, reflects the received monochromatic light to the second phase modulation structure, and emits monochromatic light with the second wavelength after the monochromatic light is subjected to phase modulation by the second phase modulation structure; the second phase modulation structure performs phase modulation on the received monochromatic light with the second wavelength, reflects the received monochromatic light with the second wavelength to the first phase modulation structure, and emits the monochromatic light with the first wavelength after the monochromatic light with the first wavelength is subjected to phase modulation by the first phase modulation structure. Because each sub-pixel region can emit two monochromatic lights with different colors along the two sides of the organic light-emitting display panel, the double-sided display of the organic light-emitting display panel with different colors can be realized by adjusting the light-emitting colors of each sub-pixel region along the two sides of the organic light-emitting display panel; moreover, the light emitted from the two sides of the organic light-emitting display panel is subjected to real-time phase modulation through the first phase modulation structure and the second phase modulation structure, so that double-sided dynamic holographic display of the organic light-emitting display panel can be realized; in addition, the invention can realize double-sided dynamic holographic display by adopting one organic light-emitting display panel, thereby having low cost, small volume, low power consumption and beautiful appearance.
Further, in practical implementation, in the organic light emitting display panel provided in the embodiment of the present invention, as shown in fig. 2, the first phase modulation structure 3 includes: a first photonic crystal layer 31, a first dielectric layer 32 and a first sub-wavelength grating 33 which are sequentially stacked and arranged between the first substrate 1 and the first organic light-emitting field effect transistor 4 and on one side facing away from the first substrate 1; wherein the content of the first and second substances,
the first sub-wavelength grating 33 is configured to transmit monochromatic light of a first wavelength and monochromatic light of a second wavelength, the first dielectric layer 32 is configured to modulate a phase of the monochromatic light of the first wavelength, and the first photonic crystal layer 31 only allows the monochromatic light of the second wavelength to transmit therethrough.
Further, in practical implementation, in the organic light emitting display panel provided in the embodiment of the present invention, as shown in fig. 2, the second phase modulation structure 6 includes: a second photonic crystal layer 61, a second dielectric layer 62 and a second sub-wavelength grating 63 which are sequentially stacked and arranged between the second substrate 2 and the second organic light-emitting field effect transistor 5 and on the side opposite to the second substrate 2; wherein the content of the first and second substances,
the second sub-wavelength grating 63 is configured to transmit monochromatic light of the first wavelength and monochromatic light of the second wavelength, the second dielectric layer 62 is configured to modulate a phase of the monochromatic light of the second wavelength, and the second photonic crystal layer 61 allows only the monochromatic light of the first wavelength to transmit therethrough.
Further, in practical implementation, in the organic light emitting display panel provided in the embodiment of the present invention, the grating is generally formed by strip-shaped materials separated by equally spaced gaps, and each of the first sub-wavelength grating and the second sub-wavelength grating includes a plurality of grating strips arranged at intervals, and a grating gap existing between two adjacent grating strips; the width of the grating strips and the width of the grating gaps are a grating period, and the first sub-wavelength grating and the second sub-wavelength grating can transmit monochromatic light with the first wavelength and monochromatic light with the second wavelength by adjusting the grating period or the width of the grating gaps. Specifically, as shown in fig. 3, the first phase modulation structure 3 includes: a first photonic crystal layer 31, a first dielectric layer 32 and a first sub-wavelength grating 33 which are positioned between the first substrate and the first organic light-emitting field effect transistor and are sequentially stacked on one side of the first substrate back to the first substrate; taking the first sub-wavelength grating 33 as an example, the first sub-wavelength grating 33 includes a plurality of grating strips 01 arranged at intervals, and a grating gap 02 existing between two adjacent grating strips 01; the width w of the grating strip 01 and the width d of the grating gap 02 are a grating period p, and the first sub-wavelength grating 33 can transmit monochromatic light of the first wavelength and monochromatic light of the second wavelength by adjusting the grating period p or the width d of the grating gap 02.
It is to be noted that when the grating period p has a size equivalent to or smaller than the wavelength of visible light, the reflectance, transmittance, polarization characteristics, spectral characteristics, and the like of the grating all exhibit characteristics that are distinct from those of a conventional diffractive optical element, and the grating in this case is referred to as a sub-wavelength grating. In the embodiment illustrated in fig. 3, the grating period p is designed to be of a size comparable to or smaller than the wavelength of visible light, i.e. the grating is a sub-wavelength grating. According to the sub-wavelength grating theory, the transmission of different wavelengths can be realized by adjusting the period p of the sub-wavelength grating or the width d of the grating gap 02. Therefore, in order to emit monochromatic light of different colors on both sides of the organic light emitting display panel and to allow the emitted monochromatic light to be incident on the dielectric layer for phase modulation, the grating period p of the first sub-wavelength grating 33 and the grating period p of the second sub-wavelength grating 63 may be set such that both the first sub-wavelength grating 33 and the second sub-wavelength grating 63 can transmit monochromatic light of the first wavelength and monochromatic light of the second wavelength.
It should be noted that the photonic crystal is a novel optical material with a spatially periodic distribution. The photonic crystal can modulate electromagnetic waves with corresponding wavelengths, when the electromagnetic waves are transmitted in the photonic crystal structure, the electromagnetic waves are modulated due to Bragg scattering, the energy of the electromagnetic waves forms an energy band structure, a band gap exists between energy bands, namely a photonic band gap, photons with all energy in the photonic band gap cannot enter the crystal, namely, only light with certain frequency is completely prohibited from being transmitted in the photonic crystal with certain periodic distance, and then the light is transmitted.
In order to realize that monochromatic light with different colors is emitted on two sides of the organic light-emitting display panel in each sub-pixel unit, the invention arranges the photonic crystal layers on the two sides of the organic light-emitting display panel, for example, as shown in fig. 2, the first photonic crystal layer 31 only allows light emitted by the second organic light-emitting field effect transistor 5, for example, the second organic light-emitting field effect transistor 5 emits red light, and the first photonic crystal layer 31 only allows the red light to pass through; the second photonic crystal layer 61 allows only light emitted by the first organic light emitting field effect transistor 4, for example, green light to be emitted by the first organic light emitting field effect transistor 4, and the second photonic crystal layer 61 allows only red and green light to pass therethrough.
Further, in practical implementation, in the organic light emitting display panel provided in the embodiment of the present invention, both the first dielectric layer and the second dielectric layer are electro-optic crystals. The electro-optic crystal is a material with the crystal refractive index changing along with an external electric field, and the purpose of light wave modulation is achieved through the change of the external electric field. The invention modulates the light incident to the first medium layer and the light incident to the second medium layer by changing the electric field, namely, modulates the phase of the light wave in real time and records, thereby realizing the double-sided dynamic holographic display of the organic light-emitting display panel.
Further, in practical implementation, in the above organic light emitting display panel provided by the embodiment of the present invention, as shown in fig. 2, the first organic light emitting field effect transistor 4 includes a first source 41, a first drain 42, a first organic light emitting layer 43 and a first gate (not shown in the figure) located on a side of the first phase modulation structure 3 facing the second substrate 2; the second organic light emitting field effect transistor 5 includes a second source electrode 51, a second drain electrode 52, a second organic light emitting layer 53 and a second gate electrode (not shown) on a side of the second phase modulation structure 6 facing the first substrate 1.
Specifically, in the organic light emitting field effect transistor, compared to the conventional OLED, charge transfer occurs in the horizontal plane (horizontal electric field) of the organic light emitting layer and the transfer occurs driven by the field effect. In the organic light emitting field effect transistor, a current between a source electrode and a drain electrode is controlled by a third electrode (gate electrode), so that aggregation and annihilation of carriers in an organic light emitting layer occur at a semiconductor/insulator interface. As shown in fig. 4, taking the first organic light emitting field effect transistor 4 as an example to explain the light emitting principle of the first organic light emitting field effect transistor 4, the first organic light emitting field effect transistor 4 specifically includes: a substrate 40, a first gate electrode 44 on the substrate 40, an insulating layer 45 on the first gate electrode 44, a first organic light emitting layer 43 on the insulating layer 45, and a first source electrode 41 and a first drain electrode 42 on the first organic light emitting layer 43; when a voltage is applied to the first gate electrode 44 and a data voltage is input to the first source electrode 41, positive and negative charges are generated in the first organic light emitting layer 43, that is, the charges are transferred in a horizontal plane (horizontal electric field) in the first organic light emitting layer 43 and are driven by a field effect to be transferred, so that the accumulation and annihilation of carriers in the first organic light emitting layer 43 occur at the first organic light emitting layer 43/insulating layer 45 interface, thereby emitting light.
Further, in practical implementation, as shown in fig. 2, the organic light emitting display panel provided in the embodiment of the present invention further includes a cathode 7 located between the first organic light emitting field effect transistor 4 and the second organic light emitting field effect transistor 5, and the first organic light emitting field effect transistor 4 and the second organic light emitting field effect transistor 5 share the cathode 7. This reduces the number of processes for forming a cathode layer and reduces the thickness of the display panel. Specifically, the cathode may be electrically connected to the first gate and the second gate through a via.
The two-sided light emitting principle of the organic light emitting display panel shown in fig. 2 provided by the embodiment of the invention is as follows: assuming that the first organic light emitting layer 43 emits light of a green wavelength and the second organic light emitting layer 53 emits light of a red wavelength, the first photonic crystal layer 31 is correspondingly positioned to transmit light of the red wavelength and have a strong reflection effect on light of other wavelengths, and the second photonic crystal layer 61 is correspondingly positioned to transmit light of the green wavelength and have a strong reflection effect on light of other wavelengths. When the green pixel of the first organic light emitting layer 43 is turned on, light is transmitted in the direction of the first substrate 1, light directed to the first substrate 1 is reflected without passing through the first photonic crystal layer 31 and is finally transmitted to the second substrate 2 through the second photonic crystal layer 61, and all light emitted from the green pixel is emitted from the second substrate 2 side; similarly, the effect of lighting up the red pixel of the second organic light-emitting layer 53 is also the same, and light can ultimately exit from the first substrate 1 side only through the first photonic crystal layer 31. Therefore, the double-layer organic light emitting layer is designed in a laminated manner, so that light emitted by the first organic light emitting layer 43 can only be emitted through the second substrate 2 side, the second organic light emitting layer 53 can only be emitted through the first substrate 1 side, the two layers are not interfered with each other, and the double-sided display effect can be realized through respective driving voltage design.
The light emitted from the first organic light-emitting layer 43 and the light emitted from the second organic light-emitting layer 53 enter the corresponding sub-wavelength grating, and are modulated by the sub-wavelength grating and reflected by the photonic crystal layer, and are reflected back to the phase-modulated light. The first dielectric layer and the second dielectric layer are respectively applied with an electric field control, the dielectric constants of the first dielectric layer and the second dielectric layer, such as refractive indexes, can be changed in real time under the control of voltage, namely, the sub-wavelength grating can modulate the phase of incident light within the range of [0, 2 pi ], and dynamic holographic display is realized.
Further, in practical implementation, as shown in fig. 2, the organic light emitting display panel provided in the embodiment of the present invention further includes: a first insulating layer 8 between the first dielectric layer 32 and the first source and drain electrodes, a second insulating layer 9 between the second dielectric layer 62 and the second source and drain electrodes, a pixel defining layer 10 defining each sub-pixel region, and a sealant 11 for encapsulating the organic light emitting display panel.
Based on the same inventive concept, an embodiment of the present invention further provides a method for manufacturing the organic light emitting display panel, including:
a first phase modulation structure, a first organic light-emitting field effect transistor, a second organic light-emitting field effect transistor and a second phase modulation structure are sequentially manufactured on a first substrate in a stacked mode.
The following describes in detail the process of fabricating the organic light emitting display panel provided in fig. 2 according to the embodiment of the present invention through detailed steps.
(1) A first photonic crystal layer 31 is formed on the first substrate 1 as shown in fig. 5A; wherein the first photonic crystal layer 31 allows only light of a specific color wavelength to pass therethrough, e.g., the first photonic crystal layer 31 allows only light of a red wavelength to pass therethrough;
(2) forming a first dielectric layer 32 on the first photonic crystal layer 31, as shown in fig. 5B; the first dielectric layer 32 is an electro-optic crystal, and the dielectric constant, such as refractive index, of the electro-optic crystal changes with voltage;
(3) forming a first sub-wavelength grating 33 on the first dielectric layer 32, as shown in fig. 5C; wherein the first sub-wavelength grating 33 may comprise a metal grating or a dielectric grating;
(4) forming a first insulating layer 8 on the first sub-wavelength grating 33, as shown in fig. 5D;
(5) forming a first source electrode 41 and a first drain electrode 42 on the first insulating layer 8, as shown in fig. 5E;
(6) forming a first organic light emitting layer 43, as shown in fig. 5F, for example, a green organic light emitting layer, on the film layer where the first source electrode 41 and the first drain electrode 42 are located;
(7) forming a cathode 7 insulated from the first organic light emitting layer 43 on the first organic light emitting layer 43, as shown in fig. 5G;
(8) a second organic light emitting layer 53, as shown in fig. 5H, for example, a red organic light emitting layer is formed on the cathode 7;
(9) forming a second source electrode 51 and a second drain electrode 52 on the second organic light emitting layer 53, as shown in fig. 5I;
(10) forming a second insulating layer 9 on the film where the second source electrode 51 and the second drain electrode 52 are located, as shown in fig. 5J;
(11) forming a second sub-wavelength grating 63 on the second insulating layer 9, as shown in fig. 5K; wherein the second sub-wavelength grating 63 may comprise a metal grating or a dielectric grating;
(12) forming a second dielectric layer 62 on the second sub-wavelength grating 63, as shown in fig. 5L; the second dielectric layer 62 is an electro-optic crystal, and the dielectric constant, such as refractive index, of the electro-optic crystal changes with voltage;
(13) forming a pixel defining layer 10, as shown in fig. 5M; the pixel defining layer 10 is used to isolate each sub-pixel to prevent color mixing;
(14) forming a second photonic crystal layer 61 on the second dielectric layer 62, as shown in fig. 5N; wherein the second photonic crystal layer 61 allows only light of a specific color wavelength to pass therethrough, e.g., the second photonic crystal layer 61 allows only light of a green wavelength to pass therethrough;
(15) forming a frame sealing adhesive layer 11 on the first substrate 1 in the area for forming the packaging adhesive, as shown in fig. 5O;
(16) bonding the second substrate 2 to the first substrate 1, as shown in fig. 5P; i.e., the organic light emitting display panel shown in fig. 2 is formed.
Therefore, the organic light emitting display panel shown in fig. 2 provided by the embodiment of the present invention can be prepared through the above steps (1) to (16).
It should be noted that, in the manufacturing method provided by the embodiment of the present invention, patterns of the first gate and the second gate are further formed, and the cathode is connected to the gate through a via penetrating through the insulating layer.
It should be noted that the preparation method provided by the embodiment of the present invention further includes forming other functional film layers known to those skilled in the art, which are not described in detail herein.
Based on the same inventive concept, an embodiment of the present invention further provides a display method of the organic light emitting display panel provided in the embodiment of the present invention, including:
the first phase modulation structure performs phase modulation on the received monochromatic light with the first wavelength, reflects the received monochromatic light to the second phase modulation structure, and emits monochromatic light with the second wavelength after the monochromatic light is subjected to phase modulation by the second phase modulation structure;
the second phase modulation structure performs phase modulation on the received monochromatic light with the second wavelength, reflects the received monochromatic light with the second wavelength to the first phase modulation structure, and emits the monochromatic light with the first wavelength after the monochromatic light with the first wavelength is subjected to phase modulation by the first phase modulation structure.
According to the display method of the organic light-emitting display panel provided by the embodiment of the invention, each subpixel region can emit two kinds of monochromatic light with different colors along two sides of the organic light-emitting display panel, so that double-sided display of the organic light-emitting display panel with different colors can be realized by adjusting the light-emitting colors of each subpixel region along two sides of the organic light-emitting display panel; moreover, the light emitted from the two sides of the organic light-emitting display panel is subjected to real-time phase modulation through the first phase modulation structure and the second phase modulation structure, so that double-sided dynamic holographic display of the organic light-emitting display panel can be realized; in addition, the invention can realize double-sided dynamic holographic display by adopting one organic light-emitting display panel, thereby having low cost, small volume, low power consumption and beautiful appearance.
In a specific implementation, the light emitting principle of the display method of the organic light emitting display panel may refer to the light emitting principle described in the display method of the organic light emitting display panel, and is not described herein again.
Based on the same inventive concept, embodiments of the present invention further provide a display device, including the organic light emitting display panel in the above embodiments. Since the principle of the display device to solve the problem is similar to that of the organic light emitting display panel, the implementation of the display device can be referred to the implementation of the organic light emitting display panel, and repeated details are omitted.
In a specific implementation, the display device provided in the embodiment of the present invention may be a full-screen display device, or may also be a flexible display device, and is not limited herein.
In specific implementation, the display device provided in the embodiment of the present invention may be a full-screen mobile phone as shown in fig. 6. Of course, the display device provided in the embodiment of the present invention may also be any product or component having a display function, such as a tablet computer, a television, a display, a notebook computer, a digital photo frame, and a navigator. Other essential components of the display device are understood by those skilled in the art, and are not described herein or should not be construed as limiting the invention.
In the organic light emitting display panel, the manufacturing method thereof and the display device provided by the embodiment of the invention, each sub-pixel region comprises a first phase modulation structure, a first organic light emitting field effect transistor, a second organic light emitting field effect transistor and a second phase modulation structure which are sequentially stacked; when displaying, the first organic light-emitting field effect transistor emits monochromatic light with a first wavelength to the first phase modulation structure, the second organic light-emitting field effect transistor emits monochromatic light with a second wavelength to the second phase modulation structure, and the monochromatic light with the first wavelength and the monochromatic light with the second wavelength are different in color; the first phase modulation structure performs phase modulation on the received monochromatic light with the first wavelength, reflects the received monochromatic light to the second phase modulation structure, and emits monochromatic light with the second wavelength after the monochromatic light is subjected to phase modulation by the second phase modulation structure; the second phase modulation structure performs phase modulation on the received monochromatic light with the second wavelength, reflects the received monochromatic light with the second wavelength to the first phase modulation structure, and emits the monochromatic light with the first wavelength after the monochromatic light with the first wavelength is subjected to phase modulation by the first phase modulation structure. Because each sub-pixel region can emit two monochromatic lights with different colors along the two sides of the organic light-emitting display panel, the double-sided display of the organic light-emitting display panel with different colors can be realized by adjusting the light-emitting colors of each sub-pixel region along the two sides of the organic light-emitting display panel; moreover, the light emitted from the two sides of the organic light-emitting display panel is subjected to real-time phase modulation through the first phase modulation structure and the second phase modulation structure, so that double-sided dynamic holographic display of the organic light-emitting display panel can be realized; in addition, the invention can realize double-sided dynamic holographic display by adopting one organic light-emitting display panel, thereby having low cost, small volume, low power consumption and beautiful appearance.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. An organic light-emitting display panel is characterized by comprising a first substrate, a second substrate and a plurality of sub-pixel regions, wherein the first substrate and the second substrate are oppositely arranged, the plurality of sub-pixel regions are positioned between the first substrate and the second substrate, and each sub-pixel region comprises a first phase modulation structure, a first organic light-emitting field effect transistor, a second organic light-emitting field effect transistor and a second phase modulation structure which are sequentially stacked; wherein the content of the first and second substances,
the first organic light emitting field effect transistor is used for emitting monochromatic light with a first wavelength to the first phase modulation structure, the second organic light emitting field effect transistor is used for emitting monochromatic light with a second wavelength to the second phase modulation structure, and the color of the monochromatic light with the first wavelength is different from that of the monochromatic light with the second wavelength;
the first phase modulation structure is used for performing phase modulation on the received monochromatic light with the first wavelength, reflecting the received monochromatic light with the first wavelength to the second phase modulation structure, and emitting monochromatic light with the second wavelength after the monochromatic light with the second wavelength is subjected to phase modulation by the second phase modulation structure;
the second phase modulation structure is used for performing phase modulation on the received monochromatic light with the second wavelength, reflecting the received monochromatic light with the second wavelength to the first phase modulation structure, and emitting the monochromatic light with the first wavelength after the monochromatic light with the first wavelength is subjected to phase modulation by the first phase modulation structure.
2. The organic light emitting display panel of claim 1, wherein the first phase modulation structure comprises: the first photonic crystal layer, the first dielectric layer and the first sub-wavelength grating are sequentially stacked and arranged between the first substrate and the first organic light-emitting field effect transistor and on one side of the first substrate back to; wherein the content of the first and second substances,
the first sub-wavelength grating is used for transmitting the monochromatic light with the first wavelength and the monochromatic light with the second wavelength, the first dielectric layer is used for modulating the phase of the monochromatic light with the first wavelength, and the first photonic crystal layer only allows the monochromatic light with the second wavelength to penetrate through.
3. The organic light emitting display panel of claim 2, wherein the second phase modulation structure comprises: the second photonic crystal layer, the second dielectric layer and the second sub-wavelength grating are sequentially arranged between the second substrate and the second organic light-emitting field effect transistor in a laminated manner and on one side, back to the second substrate; wherein the content of the first and second substances,
the second sub-wavelength grating is used for transmitting the monochromatic light with the first wavelength and the monochromatic light with the second wavelength, the second dielectric layer is used for modulating the phase of the monochromatic light with the second wavelength, and the second photonic crystal layer only allows the monochromatic light with the first wavelength to penetrate through.
4. The organic light-emitting display panel according to claim 3, wherein each of the first sub-wavelength grating and the second sub-wavelength grating includes a plurality of grating strips arranged at intervals, and a grating gap existing between adjacent two of the grating strips; the width of the grating strips and the width of the grating gaps are a grating period, and the first sub-wavelength grating and the second sub-wavelength grating can transmit monochromatic light with the first wavelength and monochromatic light with the second wavelength by adjusting the grating period or the width of the grating gaps.
5. The organic light emitting display panel of claim 3, wherein the first dielectric layer and the second dielectric layer are both electro-optic crystals.
6. The organic light emitting display panel of claim 1, wherein the first organic light emitting field effect transistor includes a first source electrode, a first drain electrode, a first organic light emitting layer, and a first gate electrode at a side of the first phase modulation structure facing the second substrate; the second organic light emitting field effect transistor comprises a second source electrode, a second drain electrode, a second organic light emitting layer and a second grid electrode which are positioned on one side, facing the first substrate, of the second phase modulation structure.
7. The organic light emitting display panel of claim 1, further comprising a cathode between the first organic light emitting field effect transistor and the second organic light emitting field effect transistor, the first organic light emitting field effect transistor and the second organic light emitting field effect transistor sharing the cathode.
8. A display device comprising the organic light-emitting display panel according to any one of claims 1 to 7.
9. A method of manufacturing an organic light emitting display panel according to any one of claims 1 to 7, comprising:
and sequentially manufacturing a first phase modulation structure, a first organic light-emitting field effect transistor, a second organic light-emitting field effect transistor and a second phase modulation structure which are arranged in a stacked manner on the first substrate.
10. A display method of the organic light emitting display panel according to any one of claims 1 to 7, comprising:
the first phase modulation structure performs phase modulation on the received monochromatic light with the first wavelength, reflects the received monochromatic light with the first wavelength to the second phase modulation structure, and emits monochromatic light with a second wavelength after the monochromatic light with the second wavelength is subjected to phase modulation by the second phase modulation structure;
the second phase modulation structure performs phase modulation on the received monochromatic light with the second wavelength, reflects the received monochromatic light with the second wavelength to the first phase modulation structure, and emits the monochromatic light with the first wavelength after the monochromatic light with the first wavelength is subjected to phase modulation by the first phase modulation structure.
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