CN108520890B - Display substrate, preparation method thereof and display panel - Google Patents
Display substrate, preparation method thereof and display panel Download PDFInfo
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- CN108520890B CN108520890B CN201810353912.5A CN201810353912A CN108520890B CN 108520890 B CN108520890 B CN 108520890B CN 201810353912 A CN201810353912 A CN 201810353912A CN 108520890 B CN108520890 B CN 108520890B
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/30—Devices specially adapted for multicolour light emission
- H10K59/38—Devices specially adapted for multicolour light emission comprising colour filters or colour changing media [CCM]
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
- H10K50/11—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers
- H10K50/125—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers specially adapted for multicolour light emission, e.g. for emitting white light
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- H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
Abstract
The invention discloses a display substrate, a preparation method thereof and a display panel, wherein the display substrate comprises: the color light-emitting diode comprises a substrate base plate, and a color light-emitting layer and a magnetic field generation layer which are positioned on the substrate base plate; the color light emitting layer includes: a plurality of color luminous patterns, the material of the color luminous patterns comprising: a magneto-refractive index adjusting material and a photoluminescent material dispersed in the magneto-refractive index adjusting material; the magnetic field generation layer includes: the transparent electrodes are in one-to-one correspondence with the color luminous patterns, the transparent electrodes are arranged opposite to the corresponding color luminous patterns, and the transparent electrodes are used for generating corresponding magnetic fields according to received driving currents so as to adjust the refractive indexes of the corresponding color luminous patterns. According to the technical scheme, the light-emitting intensity of the light-emitting surface of each color light-emitting pattern is independently controlled, so that the chromaticity uniformity of a picture displayed by the display panel can be improved, and the problem of color cast caused by uneven aging degree of the color light-emitting patterns is solved.
Description
Technical Field
The invention relates to the technical field of display, in particular to a display substrate, a preparation method thereof and a display panel.
Background
Organic Light-Emitting Diode (OLED) devices have become the next generation display technology with great competitiveness and development prospect due to the advantages of high brightness, full viewing angle, fast response speed, and being applicable to flexible display.
In the OLED display panel, white light emitted from the white OLED is mainly used to excite a photoluminescent material (a material capable of emitting light of a specific color after receiving illumination) to emit light, so as to implement color display. Currently, the photoluminescent materials used in OLED display panels are typically blue fluorescent materials, green/yellow phosphorescent materials. In practical applications, it is found that as the use time increases, the photoluminescence materials (fluorescent materials and phosphorescent materials) gradually age to cause the luminous efficiency to gradually decrease; when the difference between the luminous efficiency of the blue fluorescent material and the luminous efficiency of the green/yellow phosphorescent material reaches a certain value, the green/yellow light component in the display picture is obviously redundant to the blue light component, the chromaticity of the display picture is not uniform, and the display picture is yellow or green.
Disclosure of Invention
The invention aims to at least solve one technical problem in the prior art, and provides a display substrate, a preparation method thereof and a display panel.
To achieve the above object, the present invention provides a display substrate comprising: the color light-emitting diode comprises a substrate base plate, and a color light-emitting layer and a magnetic field generation layer which are positioned on the substrate base plate;
the color light emitting layer includes: a plurality of color luminous patterns, the material of the color luminous patterns comprising: a magneto-refractive index adjusting material and a photoluminescent material dispersed in the magneto-refractive index adjusting material;
the magnetic field generation layer includes: the transparent electrodes are in one-to-one correspondence with the color luminous patterns, the transparent electrodes are arranged opposite to the corresponding color luminous patterns, and the transparent electrodes are used for generating corresponding magnetic fields according to received driving currents so as to adjust the refractive indexes of the corresponding color luminous patterns.
Optionally, the magneto-refractive index adjusting material comprises: a transparent dispersion medium, and a transparent magnetic material and refractive index-adjusting particles dispersed in the transparent dispersion medium;
the distribution of the transparent magnetic material in the transparent dispersion medium can be changed under the control of an external magnetic field, so that the density and the refractive index of the color luminous pattern can be adjusted.
Optionally, the refractive index regulating particle comprises: silicon dioxide nanoparticles or zirconium dioxide nanoparticles.
Optionally, the method further comprises: the driving structures are in one-to-one correspondence with the transparent electrodes and are used for generating driving current according to the adjusting voltage and outputting the driving current to the corresponding transparent electrodes;
the adjusting voltage is a preset voltage corresponding to the refractive index of the color luminous pattern.
Optionally, the display substrate further comprises: the pixel array comprises a plurality of first grid lines and a plurality of first data lines, wherein the first grid lines and the first data lines define a plurality of pixel regions, and all the pixel regions form a pixel array;
each pixel region is provided with one color light-emitting pattern, one transparent electrode corresponding to the color light-emitting pattern and one driving structure corresponding to the transparent electrode;
the driving structure includes: a switching transistor, a driving transistor and a storage capacitor;
the control electrode of the switch transistor is connected with the first grid line of the corresponding row, the first electrode of the switch transistor is connected with the first data line of the corresponding column, and the second electrode of the switch transistor is connected with the control electrode of the drive transistor;
a control electrode of the driving transistor is connected with a first end of the storage capacitor, a first electrode of the driving transistor is connected with a first power supply end, a second electrode of the driving transistor is connected with a first end of the corresponding transparent electrode, and a second end of the transparent electrode is connected with a second power supply end;
and the second end of the storage capacitor is connected with the second power supply end or grounded.
Optionally, the method further comprises: and the shading graph covers the area, which is not provided with the colorful luminous graph, on the display substrate. .
Optionally, the transparent electrode is positioned on a side of the color light-emitting pattern facing away from the substrate;
or the transparent electrode is positioned on one side of the color light-emitting pattern facing the substrate base plate.
To achieve the above object, the present invention also provides a display panel including: such as the display substrate described above.
In order to achieve the above object, the present invention further provides a method for manufacturing a display substrate, including:
forming a magnetic field generating layer and a color light emitting layer on a substrate, wherein the color light emitting layer includes: a plurality of color luminous patterns, the material of the color luminous patterns comprising: a magneto-refractive index adjusting material and a photoluminescent material dispersed in the magneto-refractive index adjusting material; the magnetic field generation layer includes: the transparent electrodes are in one-to-one correspondence with the color luminous patterns, the transparent electrodes are arranged opposite to the corresponding color luminous patterns, and the transparent electrodes are used for generating corresponding magnetic fields according to received driving currents so as to adjust the refractive indexes of the corresponding color luminous patterns.
Optionally, the magneto-refractive index adjusting material comprises: a transparent dispersion medium, and a transparent magnetic material and refractive index-adjusting particles dispersed in the transparent dispersion medium;
the step of forming the color light emitting pattern includes:
uniformly dispersing the photoluminescence material, the transparent magnetic material and the refractive index regulation particles in the transparent dispersion medium solution to obtain a mixed solution;
spin-coating the mixed solution on the substrate base plate, and carrying out curing treatment on the mixed solution to obtain a color luminescent film;
and patterning the color light-emitting film to obtain the color light-emitting pattern.
Drawings
FIG. 1 is a schematic cross-sectional view of an OLED display panel in the prior art;
fig. 2 is a schematic cross-sectional view of a display substrate according to an embodiment of the invention;
FIG. 3 is a schematic structural diagram of the color luminescent pattern in FIG. 2;
FIG. 4 is a schematic diagram of the light path of light emitted by the photoluminescent material;
FIG. 5 is a schematic diagram of the working principle of the magneto-refractive index adjusting material in the present invention;
fig. 6 is a schematic top view of a display substrate according to an embodiment of the invention;
fig. 7 is a schematic cross-sectional view of a display substrate according to a second embodiment of the invention;
fig. 8 is a flowchart of a method for manufacturing a display substrate according to a fourth embodiment of the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, a display substrate, a method for manufacturing the same, and a display panel provided by the present invention are described in detail below with reference to the accompanying drawings.
Fig. 1 is a schematic cross-sectional view of an OLED display panel in the prior art, as shown in fig. 1, the OLED display panel includes: the array substrate 1 and with array substrate 1 relative set up to box base plate 2, divide in the OLED display panel and have a plurality of pixel region, be formed with a plurality of OLED with pixel region one-to-one correspondence on the array substrate 1, OLED sends white light. A color light emitting layer is formed on the cassette aligning substrate 2, and the color film light emitting layer includes: and the color light-emitting patterns 3 correspond to the OLEDs one by one, wherein the material of the color light-emitting patterns 3 is a photoluminescence material, such as a blue fluorescent material, a green phosphorescent material, a yellow phosphorescent material and the like.
When the light emitted by the OLED is irradiated to the color light-emitting patterns 3, the photoluminescent material is excited to emit specific color light with corresponding brightness, and the luminance of each color light-emitting pattern 3 is related to its own luminance and the brightness of the light emitted by the OLED. The luminance of each pixel region is determined by the luminance of the corresponding color light-emitting pattern 3.
The pixel region includes: for example, the color light-emitting pattern 3 includes a blue light-emitting pattern B and a yellow light-emitting pattern Y, the blue light-emitting pattern B is made of a blue fluorescent material, and the yellow light-emitting pattern Y is made of a yellow phosphorescent material. After the OLED display panel is used for a period of time, the actual brightness of blue light emitted by the blue light-emitting pattern B is far less than the theoretical brightness because the descending speed of the luminous rate of the blue fluorescent material is too fast (the luminous rate is relatively low); meanwhile, since the luminous efficiency of the yellow phosphorescent material decreases at a relatively slow rate (the luminous efficiency is relatively high), the actual luminance of yellow light emitted from the yellow luminous pattern Y is slightly less than the theoretical luminance; in this case, the display screen is significantly yellowish due to a large yellow component, and the chromaticity of the display screen is not uniform.
In order to solve the problem of yellow display frame, the prior art often selects to increase the number of blue pixel regions to improve the blue light component in the display frame, i.e. two blue pixel regions are collocated with one yellow pixel region, which is called as a B/Y/B structure. However, in the OLED display panel having the B/Y/B structure, the display panel has a large blue component in an initial stage of use, and the display screen is blue. Therefore, the prior art cannot fundamentally solve the problem of uneven chromaticity of the display picture.
In order to solve the above problems, the invention provides a display substrate, a manufacturing method thereof and a display panel.
Fig. 2 is a schematic cross-sectional view of a display substrate according to an embodiment of the present invention, and fig. 3 is a schematic structural view of a color light-emitting pattern in fig. 2, as shown in fig. 2 and fig. 3, the display substrate is a dual-box substrate disposed opposite to an array substrate in an OLED display panel, and the display substrate includes: a substrate 4, and a color light emitting layer and a magnetic field generating layer on the substrate 4; wherein, the colored luminescent layer includes: a plurality of color light-emitting patterns 3 (the color light-emitting patterns 3 correspond to the pixel regions one to one), and the material of the color light-emitting patterns 3 includes: a magneto-refractive index adjusting material 3a and a photoluminescent material 3b dispersed in the magneto-refractive index adjusting material 3 a; the magnetic field generation layer includes: the transparent electrodes 5 are arranged opposite to the corresponding colored light-emitting patterns 3, and the transparent electrodes 5 are used for generating corresponding magnetic fields according to received driving currents so as to adjust the refractive index of the corresponding colored light-emitting patterns 3.
The substrate 4 may be a glass substrate or a flexible substrate. The photoluminescent material 3b may be a fluorescent material or a phosphorescent material. It should be noted that the photoluminescent materials 3b contained in the color luminescent patterns 3 in different pixel units may be the same or different, and specific materials may be selected according to actual needs.
The surface of one side of the color light-emitting pattern 3, which faces away from the substrate 4, is used for receiving light emitted by the corresponding OLED on the array substrate, and after being illuminated, the photoluminescent material 3b in the color light-emitting pattern 3 emits specific color light with corresponding brightness, and part of the specific color light is emitted out through the color light-emitting pattern 3 toward the surface of one side of the substrate 4.
In the present invention, when a driving current is applied to the transparent electrode 5, since the current has a magnetic effect, a corresponding magnetic field is generated around the transparent electrode 5, and the magnetic refractive index adjusting material 3a in the color light emitting pattern 3 corresponding to the transparent electrode 5 can adjust the refractive index of the color light emitting pattern 3 in response to the magnetic field. When the refractive index of the color light-emitting pattern 3 changes, the transmittance and reflectance of the surface of the color light-emitting pattern 3 facing the substrate 4 change, so that the actual brightness of the pixel region can be adjusted.
The principle of adjusting the brightness of the light emitted from the corresponding pixel region through the transparent electrode 5 in the present invention will be described in detail with reference to the accompanying drawings. The case where the transparent electrode 5 is located on the side of the color light-emitting pattern 3 facing the base substrate 4 and is in contact with the color light-emitting pattern 3 will be exemplified. For convenience of description, a surface of the color light-emitting pattern 3 facing away from the base substrate 4 is referred to as a "light-receiving surface", and a surface of the color light-emitting pattern 3 facing toward the base substrate 4 is referred to as a "light-emitting surface".
Fig. 4 is a schematic diagram of a light path of light emitted by the photoluminescent material 3b, as shown in fig. 4, the photoluminescent material 3b emits light of a specific color with a corresponding brightness after receiving illumination of the OLED, wherein a part of the light is emitted to the light-emitting surface, a part of the light emitted to the light-emitting surface is reflected on the light-emitting surface, and another part of the light is refracted on the light-emitting surface and emitted.
In this embodiment, it is assumed that the refractive index of the color light-emitting pattern 3 is n1, and the refractive index of the transparent electrode 5 attached to the light-emitting surface of the color light-emitting pattern 3 is n 2. For convenience of description, taking the case that the light is emitted to the light-emitting surface perpendicularly, in the process that the light is emitted from the color light-emitting pattern 3 to the transparent electrode 5, based on the fresnel reflection-refraction formula,
the reflectivity of the light-emitting surface is as follows:
the transmittance of the light emitting surface is:
when the refractive index n2 of the transparent electrode 5 is constant, the larger the refractive index n1 of the color light-emitting pattern 3 is, the larger the reflectance R of the light-emitting surface is, and the smaller the transmittance T is; conversely, the smaller the refractive index n1 of the color light-emitting pattern 3, the smaller the reflectance R of the light-emitting surface and the larger the transmittance T.
Under the condition that the brightness of the light emitted by the photoluminescence material 3b and emitted to the light-emitting surface is constant, the greater the transmittance T of the light-emitting surface is, the greater the light-emitting brightness is; conversely, the smaller the transmittance T of the light-emitting surface, the smaller the light-emitting brightness.
As can be seen from the above, by controlling the refractive index of the color light-emitting pattern 3, the final light-emitting brightness of the corresponding pixel region can be adjusted. Based on the principle, the invention can adjust the refractive index of the color luminous pattern 3 in each pixel area in a targeted manner, thereby adjusting the emergent brightness of each pixel area to solve the problem of uneven chromaticity of a display picture.
Specifically, if the luminescence rate of the photoluminescent material 3b in the color luminescent pattern 3 is lower (for example, blue fluorescent material), the smaller the refractive index of the color luminescent pattern 3 is, the higher the transmittance of the light emitting surface is; if the luminous efficiency of the photoluminescent material 3b in the color luminescent pattern 3 is higher (e.g. yellow phosphorescent material or green phosphorescent material), the refractive index of the color luminescent pattern 3 can be controlled to be higher, and the transmittance of the light-emitting surface is controlled to be lower.
With continued reference to fig. 3, as an alternative in the present invention, the magneto-refractive index adjusting material 3a includes: a transparent dispersion medium 301, and a transparent magnetic material 302 and refractive index control particles 303 dispersed in the transparent dispersion medium 301; the distribution of the transparent magnetic material 302 in the transparent dispersion medium 301 can be changed under the control of an applied magnetic field, thereby adjusting the density and refractive index of the color light-emitting pattern 3.
The principle of the refractive index adjustment of the magneto-refractive index adjustment material 3a will be described in detail with reference to the accompanying drawings. Fig. 5 is a schematic diagram illustrating the working principle of the magnetic refractive index adjusting material 3a according to the present invention, and as shown in fig. 5, under the action of the magnetic field provided by the transparent electrode 5, the transparent magnetic material 302 is aggregated or dispersed in the transparent dispersion medium 301, so that the transparent dispersion medium 301 contracts or expands, the overall density of the magnetic refractive index adjusting material 3 a/the color light emitting pattern 3 changes along with the contraction or expansion of the transparent dispersion medium 301, and the overall refractive index of the magnetic refractive index adjusting material 3 a/the color light emitting pattern 3 changes along with the change of the overall density of the magnetic refractive index adjusting material 3 a/the color light emitting pattern 3.
Specifically, when the magnetic field generates an adsorption effect on the transparent magnetic material 302 (in the case shown in fig. 5), the transparent magnetic material 302 will be aggregated in the transparent dispersion medium 301, the transparent dispersion medium 301 will shrink, the overall density of the magneto-refractive index adjusting material 3 a/the color emission pattern 3 will increase, and the refractive index of the magneto-refractive index adjusting material 3 a/the color emission pattern 3 will change; when the magnetic field effect is removed or the magnetic field repels the transparent magnetic material 302 (in this case, no corresponding drawing is shown), the transparent magnetic material 302 is dispersed in the transparent dispersion medium 301, so that the transparent dispersion medium 301 is stretched, the overall density of the magneto-refractive index adjusting material 3 a/the color emission pattern 3 is increased, and the refractive index of the magneto-refractive index adjusting material 3 a/the color emission pattern 3 is changed.
When the transparent magnetic material 302 is concentrated or dispersed by a magnetic field, the layer of the transparent dispersion medium 301 mainly expands and contracts in the thickness direction of the color light-emitting pattern 3, and the dimensions in the length direction and the width direction of the color light-emitting pattern 3 are not substantially affected.
The refractive index adjusting particles 303 adjust the refractive index of the magnetic refractive index adjusting material 3 a/the color light emitting pattern 3. Alternatively, the refractive index adjusting particles 303 are silica nanoparticles or zirconia nanoparticles. The silicon dioxide nano-particles and the zirconium dioxide nano-particles are two different types of refractive index adjusting particles; wherein, when the refractive index adjusting particles 303 are silica, the refractive index of the magneto-refractive index adjusting material 3 a/the color light emitting pattern 3 increases as the overall density increases (i.e., the refractive index of the color light emitting pattern 3 increases as the amount of shrinkage deformation of the transparent dispersion medium 301 increases); when the refractive index adjusting particles 303 are zirconium dioxide, the refractive index of the magneto-refractive index adjusting material 3 a/the color light emission pattern 3 decreases as the whole density increases (i.e., the refractive index of the color light emission pattern 3 decreases as the amount of shrinkage deformation of the transparent dispersion medium 301 increases). It will be appreciated by those skilled in the art that the refractive index adjusting particles 303 of the present invention may also be nanoparticles of other materials.
In this embodiment, the display substrate further includes: and the driving structures are in one-to-one correspondence with the transparent electrodes 5 and are used for generating driving current according to the regulating voltage and outputting the driving current to the corresponding transparent electrodes 5. Wherein the adjustment voltage is a preset voltage corresponding to the refractive index of the color light emission pattern 3. The adjustment voltage, the driving current and the refractive index of the color light-emitting pattern 3 have a corresponding relationship.
In the invention, the corresponding adjusting voltage when the color luminous graph presents different refractive indexes can be obtained through experiments in advance, and a corresponding relation table is generated. In the process of actually adjusting the refractive index of the color luminous graph, table lookup is carried out according to the target refractive index required by the color luminous graph so as to obtain corresponding adjusting voltage.
Fig. 6 is a top view of a display substrate according to a first embodiment of the present invention, and as shown in fig. 6, as a specific embodiment of the present invention, a driving structure 7 is a driving circuit composed of a thin film transistor and a capacitor C.
Specifically, the display substrate further includes: a plurality of first GATE lines GATE and a plurality of first DATA lines DATA, wherein the first DATA lines DATA are connected to a voltage output chip (not shown) that can supply a regulated voltage. All the first GATE lines GATE and all the first DATA lines DATA define a plurality of pixel regions, and all the pixel regions constitute a pixel array; each pixel region is provided with a color light emitting pattern 3, a transparent electrode 5 corresponding to the color light emitting pattern 3, and a driving structure 7 corresponding to the transparent electrode 5.
The drive structure 7 includes: a switching transistor T1, a driving transistor T2, and a storage capacitor C; a control electrode of the switching transistor T1 is connected to the first GATE line GATE of the corresponding row, a first electrode of the switching transistor T1 is connected to the first DATA line DATA of the corresponding column, and a second electrode of the switching transistor T1 is connected to a control electrode of the driving transistor T2; a control electrode of the driving transistor T2 is connected to a first end of the storage capacitor C, a first electrode of the driving transistor T2 is connected to a first power supply terminal, a second electrode of the driving transistor T2 is connected to a first end of the corresponding transparent electrode 5, and a second end of the transparent electrode 5 is connected to a second power supply terminal; the second terminal of the storage capacitor C is connected to the second power supply terminal or grounded.
The control electrode in the present invention specifically refers to a gate electrode of the transistor, and the first electrode and the second electrode are a source electrode and a drain electrode of the transistor, respectively. The first power supply terminal provides a first working voltage VDD, and the second power supply terminal provides a second working voltage VSS.
In the present invention, when the switching transistor T1 is turned on, the adjustment voltage in the first DATA line DATA is written into the control electrode of the driving transistor T2 through the switching transistor T1, and the driving transistor T2 can output a driving current of a corresponding magnitude according to the adjustment voltage received by the control electrode thereof, so that the corresponding transparent electrode 5 can generate a corresponding magnetic field; wherein, the larger the driving current received by the transparent electrode 5, the stronger the magnetic field generated around the transparent electrode.
Therefore, in the present invention, the driving current can be controlled by adjusting the voltage, the driving current can control the magnetic field generated by the transparent electrode 5, and the magnetic field can control the refractive index of the color light-emitting pattern 3, so as to control the transmittance of the light-emitting surface of the color light-emitting pattern 3, and finally control the light-emitting intensity of the pixel region corresponding to the color light-emitting pattern 3.
It should be noted that the driving structure in the present invention is not limited to the above case including two transistors and one capacitor C, and the driving structure may be a driving current output circuit having another circuit structure or a driving chip having a current output function.
In addition, the shape of the transparent electrode 5 is not limited in the technical scheme of the invention, and the transparent electrode 5 can be in any shape such as a plate shape, a strip shape, a comb shape and the like.
Further optionally, the display substrate further includes: and the light-shielding pattern 6, wherein the light-shielding pattern 6 covers a region of the display substrate where the color light-emitting pattern 3 is not disposed, that is, the light-shielding pattern 6 can cover a region corresponding to the first GATE line GATE, the first DATA line DATA and the driving structure 7.
Fig. 7 is a schematic cross-sectional view of a display substrate according to a second embodiment of the present invention, as shown in fig. 7, different from the first embodiment, the transparent electrode 5 in the second embodiment is located on a side of the color light-emitting pattern 3 facing the substrate 4, at this time, a light-emitting surface of the color light-emitting pattern 3 is attached to a surface of the substrate 4, a transmittance of light entering the substrate 4 from the color light-emitting pattern 3 is related to a refractive index of the color light-emitting pattern 3 and a refractive index of the substrate 4, and the transparent electrode 5 can adjust the refractive index of the color light-emitting pattern 3, so as to adjust the brightness of light emitted from a corresponding pixel region.
Of course, a transparent medium layer may also exist between the substrate 4 and the light-emitting surface of the color light-emitting pattern 3, and such a case also falls within the protection scope of the present invention.
Embodiments one and two of the present invention provide a display substrate, which can independently control the light-emitting intensity of the light-emitting surface of each color light-emitting pattern, thereby improving the uniformity of chromaticity of the displayed image of the display panel, and solving the color shift problem caused by the non-uniform aging degree of the color light-emitting patterns.
The third embodiment of the invention provides a display panel, which comprises an array substrate and a display substrate which is aligned with the array substrate, wherein the display substrate adopts the display substrate in the first embodiment or the second embodiment.
The array substrate is provided with a plurality of second grid lines and a plurality of second data lines, the second grid lines and the second data lines limit a plurality of pixel regions, each pixel region is provided with an OLED and a corresponding pixel driving circuit, and the pixel driving circuits are used for providing driving current for the OLEDs so as to drive the OLEDs to emit light.
It should be noted that, when the display substrate is provided with the first gate line, the first data line and the driving structure, the first gate line may be disposed opposite to the second gate line, the first data line may be disposed opposite to the second data line, and the driving structure may be disposed opposite to the pixel driving circuit, and at this time, the light-shielding pattern may cover the second gate line, the second data line and the pixel region circuit.
Fig. 8 is a flowchart of a method for manufacturing a display substrate according to a fourth embodiment of the present invention, for manufacturing the display substrates according to the first and second embodiments, where the method includes:
step S101 is to form a magnetic field generating layer on a substrate.
Step S102 is to form a color light emitting layer on the substrate.
Wherein, the colored luminescent layer includes: a plurality of color luminous patterns, the color luminous patterns being made of materials including: a magneto-refractive index adjusting material and a photoluminescent material dispersed in the magneto-refractive index adjusting material; the magnetic field generation layer includes: the transparent electrodes are arranged opposite to the corresponding colored luminous patterns and used for generating corresponding magnetic fields according to the received driving current so as to adjust the refractive index of the corresponding colored luminous patterns.
In step S102, the magneto-refractive index adjusting material includes: transparent dispersion medium, transparent magnetic material and refractive index regulating particle dispersed in the transparent dispersion medium; the step of forming the color light emitting pattern includes:
step S1021, uniformly dispersing the photoluminescence material, the transparent magnetic material and the refractive index control particles in the transparent dispersion medium solution to obtain a mixed solution.
Wherein, the transparent dispersion medium can be a solution obtained by ultrasonically stirring and uniformly mixing materials such as organic silicon, epoxy resin, polyimide and the like.
The transparent magnetic material can be FeBO3、FeF3、K2CrCl4Euse, rare earth glass, Fe304At least one of the transparent magnetic materials is in the shape of nano particles, the diameter of the transparent magnetic material is 1-10 nm, and the transparent magnetic material accounts for 5-10% of the mass of the color luminous pattern. In practical application, the transparent magnetic material can emit light in colorThe mass percentage in the pattern is adjusted to control the electromagnetic adjustment sensitivity of the color luminous pattern.
The refractive index regulating particles are also in the form of nanoparticles, the diameter of the particles is 10-50 nm, and the mass percentage of the refractive index regulating particles in the color luminous pattern is 20-60%. In practical application, the mass percentage of the refractive index regulating particles in the color light-emitting pattern can be regulated, so that the maximum adjustable refractive index and the minimum adjustable refractive index of the color light-emitting pattern can be controlled.
The photoluminescent material may be a phosphorescent material or a fluorescent material.
Step S1022, spin-coating the mixed solution on the substrate, and performing curing treatment on the mixed solution to obtain the color light-emitting film.
Step S1023, a patterning process is performed on the color light-emitting film to obtain a color light-emitting pattern.
In step S1023, the color light-emitting pattern is obtained by performing mask exposure on the color light-emitting film and then performing wet etching thereon.
It should be noted that, for different types of color luminous patterns, the above steps S1021 to S1023 need to be performed multiple times to prepare the patterns respectively.
In addition, step S101 may be performed before step S102 in the present invention, that is, the transparent electrode is located between the color light emitting pattern and the base substrate (shown in fig. 2); alternatively, step S101 is performed after step S102, i.e. the transparent electrode is located on the side of the color light emitting pattern facing away from the substrate base (shown in fig. 7).
If the display substrate further includes a first gate line, a first data line, a driving structure, and a light-shielding pattern, before steps S101 and S102, the first gate line, the first data line, and the driving structure may be formed on the substrate by using an existing Array (Array) process, and then the light-shielding pattern may be formed in a region corresponding to the first gate electrode, the first data line, and the driving structure.
And after the preparation process of the display substrate is finished, the prepared display substrate and the array substrate prepared in advance are subjected to box matching, and the periphery of the display substrate and the array substrate is sealed by frame sealing glue to obtain the OLED display panel. The frame sealing glue can laterally prevent water and oxygen from entering, so that the organic light-emitting device is prevented from being corroded.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (10)
1. A display substrate, comprising: the color light-emitting diode comprises a substrate base plate, and a color light-emitting layer and a magnetic field generation layer which are positioned on the substrate base plate;
the color light emitting layer includes: a plurality of color luminous patterns, the material of the color luminous patterns comprising: a magneto-refractive index adjusting material and a photoluminescent material dispersed in the magneto-refractive index adjusting material;
the magnetic field generation layer includes: the transparent electrodes are in one-to-one correspondence with the color luminous patterns, the transparent electrodes are arranged opposite to the corresponding color luminous patterns, and the transparent electrodes are used for generating corresponding magnetic fields according to received driving currents so as to adjust the refractive indexes of the corresponding color luminous patterns.
2. The display substrate of claim 1, wherein the magneto-refractive index adjusting material comprises: a transparent dispersion medium, and a transparent magnetic material and refractive index-adjusting particles dispersed in the transparent dispersion medium;
the distribution of the transparent magnetic material in the transparent dispersion medium can be changed under the control of an external magnetic field, so that the density and the refractive index of the color luminous pattern can be adjusted.
3. The display substrate according to claim 2, wherein the refractive index adjusting particles comprise: silicon dioxide nanoparticles or zirconium dioxide nanoparticles.
4. The display substrate of claim 1, further comprising: the driving structures are in one-to-one correspondence with the transparent electrodes and are used for generating driving current according to the adjusting voltage and outputting the driving current to the corresponding transparent electrodes;
the adjusting voltage is a preset voltage corresponding to the refractive index of the color luminous pattern.
5. The display substrate of claim 4, further comprising: the pixel array comprises a plurality of first grid lines and a plurality of first data lines, wherein the first grid lines and the first data lines define a plurality of pixel regions, and all the pixel regions form a pixel array;
each pixel region is provided with one color light-emitting pattern, one transparent electrode corresponding to the color light-emitting pattern and one driving structure corresponding to the transparent electrode;
the driving structure includes: a switching transistor, a driving transistor and a storage capacitor;
the control electrode of the switch transistor is connected with the first grid line of the corresponding row, the first electrode of the switch transistor is connected with the first data line of the corresponding column, and the second electrode of the switch transistor is connected with the control electrode of the drive transistor;
a control electrode of the driving transistor is connected with a first end of the storage capacitor, a first electrode of the driving transistor is connected with a first power supply end, a second electrode of the driving transistor is connected with a first end of the corresponding transparent electrode, and a second end of the transparent electrode is connected with a second power supply end;
and the second end of the storage capacitor is connected with the second power supply end or grounded.
6. The display substrate of claim 1, further comprising: and the shading graph covers the area, which is not provided with the colorful luminous graph, on the display substrate.
7. The display substrate according to any one of claims 1 to 6, wherein the transparent electrode is located on a side of the color light emitting pattern facing away from the substrate;
or the transparent electrode is positioned on one side of the color light-emitting pattern facing the substrate base plate.
8. A display panel, comprising: a display substrate according to any one of claims 1 to 7.
9. A method for preparing a display substrate is characterized by comprising the following steps:
forming a magnetic field generating layer and a color light emitting layer on a substrate, wherein the color light emitting layer includes: a plurality of color luminous patterns, the material of the color luminous patterns comprising: a magneto-refractive index adjusting material and a photoluminescent material dispersed in the magneto-refractive index adjusting material; the magnetic field generation layer includes: the transparent electrodes are in one-to-one correspondence with the color luminous patterns, the transparent electrodes are arranged opposite to the corresponding color luminous patterns, and the transparent electrodes are used for generating corresponding magnetic fields according to received driving currents so as to adjust the refractive indexes of the corresponding color luminous patterns.
10. The method of manufacturing a display substrate according to claim 9, wherein the magneto-refractive index adjusting material comprises: a transparent dispersion medium, and a transparent magnetic material and refractive index-adjusting particles dispersed in the transparent dispersion medium;
the step of forming the color light emitting pattern includes:
uniformly dispersing the photoluminescence material, the transparent magnetic material and the refractive index regulation particles in the transparent dispersion medium solution to obtain a mixed solution;
spin-coating the mixed solution on the substrate base plate, and carrying out curing treatment on the mixed solution to obtain a color luminescent film;
and patterning the color light-emitting film to obtain the color light-emitting pattern.
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| US11960684B2 (en) | 2022-07-20 | 2024-04-16 | Chicony Power Technology Co., Ltd. | Light-emitting touch panel |
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| CN1196828A (en) * | 1996-06-19 | 1998-10-21 | 松下电器产业株式会社 | Photoelectronic material, device using same and method for manufacturing same |
| CN105449067A (en) * | 2015-12-31 | 2016-03-30 | 白德旭 | Graphene LED chip and preparation method thereof |
| KR20170015699A (en) * | 2015-07-30 | 2017-02-09 | 엘지디스플레이 주식회사 | Organic light emitting diode display device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1196828A (en) * | 1996-06-19 | 1998-10-21 | 松下电器产业株式会社 | Photoelectronic material, device using same and method for manufacturing same |
| KR20170015699A (en) * | 2015-07-30 | 2017-02-09 | 엘지디스플레이 주식회사 | Organic light emitting diode display device |
| CN105449067A (en) * | 2015-12-31 | 2016-03-30 | 白德旭 | Graphene LED chip and preparation method thereof |
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