CN118335023B - Display panel, preparation method and driving method - Google Patents
Display panel, preparation method and driving method Download PDFInfo
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Classifications
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3433—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using light modulating elements actuated by an electric field and being other than liquid crystal devices and electrochromic devices
- G09G3/344—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using light modulating elements actuated by an electric field and being other than liquid crystal devices and electrochromic devices based on particles moving in a fluid or in a gas, e.g. electrophoretic devices
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)
Abstract
The application relates to a display panel, a preparation method and a driving method, and relates to the technical field of display, wherein the display panel comprises: the gray scale adjusting layer is positioned on one side of the packaging layer, which is away from the luminous functional layer, the gray scale adjusting layer comprises a plurality of gray scale control units corresponding to the light emitting units one by one, the gray scale control units comprise a plurality of light-transmitting storage columns distributed at intervals and electrophoretic particles positioned between two adjacent storage columns, gray scale areas are formed between the two adjacent storage columns, positive electrodes and negative electrodes are respectively arranged on the outer sides of the storage columns positioned at two ends of the gray scale control units, voltage is generated between the positive electrodes and the negative electrodes according to gray scale signals, and the electrophoretic particles are driven to move in the corresponding gray scale areas and shade at least part of the gray scale areas so as to form different gray scale displays. In the related art, the gray scale of the display picture is regulated by a Pulse Width Modulation (PWM) method, and the application avoids causing visual fatigue of users.
Description
Technical Field
The application relates to the technical field of display, in particular to a display panel, a preparation method and a driving method.
Background
With the development of optoelectronic display technology and semiconductor manufacturing technology, the display device with thin film transistors (Thin Film Transistor, TFT) has been mature, such as liquid crystal display (TFT-LCD) or organic light emitting diode display (TFT-OLED), and has been successfully mass produced. The OLED display has obvious advantages in terms of color saturation, contrast ratio, flexible display and the like, and has wide prospects in development.
In the related art, an OLED display is dimmed by a Pulse Width Modulation (PWM) method to make the display device exhibit different brightness picture displays. The luminous brightness is unchanged, the brightness is continuously alternated by changing the luminous time ratio, namely 'bright screen-off screen-bright screen-off screen', and the screen brightness is controlled by utilizing the vision residue of human eyes.
However, the related technology uses PWM dimming, and the alternate on and off is easy to cause visual fatigue of users, so that the user experience is reduced.
Disclosure of Invention
The application aims to provide a display panel, a preparation method and a driving method, which are used for solving the technical problem that the gray scale of a display picture is easy to cause visual fatigue of a user by a Pulse Width Modulation (PWM) method in the related art.
In a first aspect, an embodiment of the present application provides a display panel, including a driving back plate, and a light emitting functional layer and a packaging layer sequentially formed on the driving back plate, where the light emitting functional layer includes a plurality of light emitting units distributed in an array, and the display panel further includes:
The gray scale adjusting layer is positioned on one side of the packaging layer, which is away from the luminous functional layer, and comprises a plurality of gray scale control units corresponding to the light emitting units one by one, wherein each gray scale control unit comprises a plurality of light-transmitting storage columns distributed at intervals and electrophoretic particles positioned between two adjacent storage columns, a gray scale area is formed between the two adjacent storage columns, and positive electrodes and negative electrodes are respectively arranged on the outer sides of the storage columns positioned at two ends of each gray scale control unit.
And controlling the voltage generated between the positive electrode and the negative electrode according to the gray signal, driving the plurality of electrophoretic particles to move in the corresponding gray area and shielding at least part of the gray area so as to form different gray display.
In one possible embodiment, the gray scale regions adjacent to the memory pillars form gray scale control subunits, and the electrophoretic particles within the plurality of gray scale control subunits differ in mass or charge number.
In a possible embodiment, one side of the storage column is provided with a storage area for storing electrophoretic particles.
In one possible implementation manner, a plurality of anodes are arranged on the driving backboard, the anodes are in one-to-one correspondence with the plurality of light emitting units, and the anodes are arranged in a protruding manner towards one side of the light emitting units.
The bottom of the storage area is provided with a reflecting layer towards one side of the light-emitting unit, and light rays emitted by the light-emitting unit are emitted from the light-emitting side after being reflected by the reflecting layer and the anode in sequence.
In one possible implementation manner, the driving backboard comprises a substrate base plate, a first driving circuit formed on the substrate base plate, a planarization layer covering the first driving circuit and a plurality of anodes located on one side of the planarization layer away from the substrate base plate, wherein a plurality of protrusions are formed on one side of the planarization layer away from the substrate base plate, and the anodes cover the protrusions.
In one possible embodiment, the light emitting unit includes a cathode, the gray scale adjusting layer further includes a second driving circuit electrically connected to the driving back plate, the second driving circuit is located between two adjacent gray scale control units, the positive electrode is electrically connected to the second driving circuit, and the negative electrode is electrically connected to the cathode.
In a second aspect, an embodiment of the present application provides a method for manufacturing a display panel as mentioned in the first aspect, including:
a drive back plate is provided.
And forming a light-emitting functional layer on the driving backboard, wherein the light-emitting functional layer comprises a plurality of light-emitting units distributed in an array.
And forming an encapsulation layer on one side of the light-emitting functional layer, which is away from the driving backboard.
And a gray scale adjusting layer is formed on one side of the packaging layer, which is away from the luminous functional layer, the gray scale adjusting layer comprises a plurality of gray scale control units corresponding to the light emitting units one by one, each gray scale control unit comprises a plurality of storage columns distributed at intervals and electrophoretic particles positioned between two adjacent storage columns, and a gray scale area is formed between the two adjacent storage columns.
Forming a positive electrode and a negative electrode on storage columns at two ends of the gray level control unit respectively; and controlling the voltage generated between the positive electrode and the negative electrode according to the gray signal, and driving the plurality of electrophoretic particles to move in the corresponding gray area and shielding at least part of the gray area so as to form different gray display.
In one possible embodiment, there is provided a drive backplate comprising:
A substrate is provided.
A first driving circuit is formed on a substrate.
A planarization layer is formed on the first driving circuit, and a plurality of protrusions are formed on one side of the planarization layer, which faces away from the substrate.
And forming a plurality of anodes on one side of the planarization layer, which is away from the substrate, wherein the anodes cover the protrusions, and the anodes are in one-to-one correspondence with the light-emitting units.
In one possible implementation manner, the gray-scale adjusting layer is formed on the side, facing away from the light-emitting functional layer, of the encapsulation layer, and further includes:
One side of the storage column is provided with a storage area, the storage column is a light-transmitting column, and the storage area is used for storing electrophoretic particles.
The bottom of the storage area is provided with a reflecting layer towards one side of the light-emitting unit, so that light rays emitted by the light-emitting unit are emitted from the light-emitting side after being reflected by the reflecting layer and the anode in sequence.
In a third aspect, an embodiment of the present application proposes a driving method of a display panel as mentioned in the first aspect, including:
A gray signal of the display panel is acquired.
According to the gray signal, controlling voltage between positive electrode and negative electrode of gray control unit of gray regulating layer to drive multiple electrophoretic particles to move in corresponding gray region and shade at least part of gray region so as to form different gray display.
The embodiment of the application provides a display panel, a preparation method and a driving method, wherein the display panel comprises a driving backboard, a light-emitting functional layer and a packaging layer which are sequentially formed on the driving backboard, the light-emitting functional layer comprises a plurality of light-emitting units distributed in an array, and the display panel further comprises: the gray scale adjusting layer is positioned on one side of the packaging layer, which is far away from the luminous functional layer, the gray scale adjusting layer comprises a plurality of gray scale control units corresponding to the plurality of luminous units one by one, the gray scale control units comprise a plurality of storage columns distributed at intervals and electrophoresis particles positioned between two adjacent storage columns, a gray scale area is formed between the two adjacent storage columns, positive electrodes and negative electrodes are respectively arranged on the storage columns positioned at two ends of the gray scale control units, voltage is generated between the positive electrodes and the negative electrodes according to gray scale signals, and the plurality of electrophoresis particles are driven to move in the corresponding gray scale areas and shade at least part of the gray scale areas so as to form different gray scale displays. Compared with the prior art that the gray scale of the display screen is adjusted by a Pulse Width Modulation (PWM), the application controls the movement of the electrophoretic particles in the gray scale adjusting layer by arranging the gray scale adjusting layer and controlling the voltage between the two electrodes so as to cover the gray scale area, thereby realizing different gray scale display, improving the gray scale adjusting precision of the screen and avoiding the visual fatigue of users.
Drawings
Features, advantages, and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings. In the drawings, like parts are designated with like reference numerals. The drawings are not drawn to scale, but are merely for illustrating relative positional relationships, and the layer thicknesses of certain portions are exaggerated in order to facilitate understanding, and the layer thicknesses in the drawings do not represent the actual layer thickness relationships.
Fig. 1 is a schematic structural diagram of a display panel according to a first embodiment of the present application;
fig. 2 is a flowchart illustrating a method for manufacturing a display panel according to a second embodiment of the present application;
Fig. 3 is a schematic structural diagram corresponding to a flow of a method for manufacturing a display panel according to a second embodiment of the present application;
Fig. 4 is a flowchart illustrating a driving method of a display panel according to a third embodiment of the present application.
Reference numerals:
11. a substrate base; 12. a first driving circuit; 121. a first gate layer; 122. a first source layer; 123. a first drain layer; 13. a planarization layer; 131. a protrusion; 14. an anode; 15. a buffer layer; 16. a first semiconductor layer; 17. a first gate insulating layer; 18. an insulating dielectric layer;
20. A light-emitting functional layer; 211. a cathode;
30. an encapsulation layer;
41. a gray-scale control unit; 411. a storage column; 412. electrophoresis particles; 413. a gray scale region; 414. a positive electrode; 415. a negative electrode; 416. a storage area; 417. a reflective layer; 418. an electrode column; 42. a gray scale control subunit; 431. a second gate layer; 432. a second source layer; 433. a second drain layer; 434. a second gate insulating layer; 435. and a second semiconductor layer.
Detailed Description
Features and exemplary embodiments of various aspects of the application are described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the application. It will be apparent, however, to one skilled in the art that the present application may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the application by showing examples of the application. In the drawings and the following description, at least some well-known structures and techniques have not been shown in detail in order not to unnecessarily obscure the present application; also, the size of the region structures may be exaggerated for clarity. Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
In the related art, an OLED display is dimmed by a pulse width modulation method to make the display device exhibit different brightness picture displays. However, adjusting the gray scale of the display screen by the pulse width modulation method is easy to cause visual fatigue of users.
In view of this, the embodiment of the application provides a display panel, a manufacturing method and a driving method, which are characterized in that a gray scale adjusting layer is arranged, and electrophoretic particles in the gray scale adjusting layer are controlled to move by voltage between two electrodes so as to cover gray scale areas, so that different gray scale display is realized, the gray scale adjusting precision of a picture is improved, and visual fatigue of a user is avoided.
The specific structure and flow of the display panel, the manufacturing method and the driving method according to the embodiments of the present application are described below with reference to the accompanying drawings.
First embodiment
Fig. 1 is a schematic structural diagram of a display panel according to a first embodiment of the present application.
As shown in fig. 1, a first embodiment of the present application provides a display panel, including a driving back plate, and a light emitting functional layer 20 and a packaging layer 30 sequentially formed on the driving back plate, wherein the light emitting functional layer 20 includes a plurality of light emitting units distributed in an array, and the display panel further includes:
The gray scale adjusting layer is located at one side of the packaging layer 30 away from the light-emitting functional layer 20, the gray scale adjusting layer comprises a plurality of gray scale control units 41 corresponding to the light-emitting units one by one, the gray scale control units 41 comprise a plurality of light-transmitting storage columns 411 distributed at intervals and electrophoretic particles 412 located between two adjacent storage columns 411, gray scale areas 413 are formed between the two adjacent storage columns 411, and positive electrodes 414 and negative electrodes 415 are respectively arranged at the outer sides of the storage columns 411 located at two ends of the gray scale control units 41.
Specifically, the light emitting unit includes 3 light emitting subunits, namely a red light subunit, a green light subunit and a blue light subunit, and each light emitting subunit of the light emitting functional layer 20 is formed into a film on the whole surface by adopting an evaporation process. Optionally, the shape of the light emitting sub-unit is any one or a combination of at least two of a circle, an ellipse and a polygon. The polygon may be a polygon such as, but not limited to, triangle, trapezoid, rectangle, quadrilateral, pentagon, hexagon, and the like. In the light emitting units, the shapes of the light emitting sub-units can be the same or different, and the light emitting sub-units are determined according to specific arrangement structures.
The light emitting functional layer 20 further includes a first common layer, a second common layer, and a light emitting layer between the first common layer and the second common layer. The first common layer includes a hole injection layer (Hole Injection Layer, HIL) near the driving back plate and a hole transport layer (Hole Transport Layer, HTL) on a side surface of the hole injection layer facing away from the driving back plate. The second common layer includes an electron transport layer (Electron Transport Layer, ETL) on a surface of the light-emitting layer and an electron injection layer (ElectronInjectionLayer, EIL) on a side surface of the electron transport layer facing away from the light-emitting layer.
The encapsulation layer 30 covers the light emitting function layer 20, and the encapsulation layer 30 includes a first inorganic layer (not shown), an organic layer (not shown), and a second inorganic layer (not shown) sequentially disposed in a direction away from the driving back plate. The first inorganic layer and the second inorganic layer are transparent inorganic film layers, and the material of the first inorganic layer and the second inorganic layer can comprise one or more ：Al2O3、TiO2、ZrO2、MgO、HFO2、Ta2O5、Si3N4、AlN、SiN、SiNO、SiO、SiO2、SiC、SiCNx、ITO、IZO. of the following materials, so that the inorganic materials have good light transmittance and good water and oxygen barrier performance. The material of the organic layer is transparent organic conductive resin, and specifically comprises transparent matrix resin, conductive molecules and/or conductive ions. Specifically, the transparent conductive resin is formed by stirring and completely dissolving polyaniline, a crosslinking monomer, toluene and the like doped with organic acid; or adding conductive molecules such as polyaniline into the transparent conductive resin; or adding conductive ions such as nano-grade antimony doped SiO 2 into the transparent conductive resin, and nano-grade conductive ions such as nano-grade indium tin oxide or nano-grade silver can be adopted.
The first and second inorganic layers made of inorganic materials completely cover the light emitting function layer 20, and thus it is possible to prevent intrusion of moisture from the side from affecting the electrical properties of the light emitting function layer 20. The patterned organic layer has higher elasticity, is clamped between the first inorganic layer and the second inorganic layer, can inhibit the cracking of the inorganic film, release the stress between inorganic matters, and can improve the flexibility of the whole packaging layer 30, thereby realizing reliable flexible packaging.
The front projection of the light emitting unit on the driving back plate overlaps with the front projection of the gray-scale control unit 41 on the driving back plate. The positive electrode 414 and the negative electrode 415 may be directly evaporated on the outer sides of the storage posts 411 at the two most ends in the gray scale control unit 41, or the electrode posts 418 may be separately provided on the outer sides of the storage posts 411 at the two most ends to evaporate the positive electrode 414 and the negative electrode 415 on the electrode posts, respectively. In fig. 1, a positive electrode 414 is vapor-deposited on the outside of one storage column 411, and an electrode column 418 is provided on the outside of the other storage column 411 to vapor-deposit a negative electrode 415.
In the display technology, gray scale refers to: the brightness change between the brightest and darkest is divided into a plurality of parts so as to facilitate the screen brightness control corresponding to the signal input. Each digital image is composed of a number of dots, also known as pixels, each of which typically may appear in a number of different colors, consisting of three sub-pixels, red, green, and blue (RGB), each of which may appear at a different brightness level from the light source behind it. While gray scale represents the hierarchical level of different brightness from darkest to brightest. The more intermediate levels, the finer the picture effect that can be presented. Taking an 8-byte display panel as an example, it can represent the power of 2 to the 8, which is equal to 256 brightness levels, which is called 256 gray levels. The color change at each point on the display screen is actually brought about by the gray scale change of the three RGB sub-pixels that make up that point.
The number of gray scale regions 413 may be set according to the number of gray scale levels required, i.e., the number of gray scale regions 413 is equal to or greater than the number of gray scale levels.
Wherein, according to the gray signal, a voltage is generated between the positive electrode 414 and the negative electrode 415 to drive the plurality of electrophoretic particles 412 to move in the corresponding gray scale region 413 and shade at least part of the gray scale region 413, so as to form different gray scale displays.
An electric field is generated between the positive electrode 414 and the negative electrode 415, and the electrophoretic particles 412 move under the action of the electric field and the voltage. Specifically, the plurality of electrophoretic particles 412 that are collected together may be dispersed under the action of the electric field, and since the electrophoretic particles 412 may block the light emitted from the light-emitting functional layer 20, the dispersed plurality of electrophoretic particles 412 may block the light with a larger area than the light blocked by the plurality of electrophoretic particles 412 that are collected together. Therefore, the brightness of the light transmitted through the gray scale adjusting layer is lower than the brightness of the light emitted by the light emitting functional layer 20, so that the brightness of the display panel, namely the gray scale of the display panel, can be adjusted.
In this embodiment, by disposing a gray-scale adjusting layer in the display panel and disposing a positive electrode 414 and a negative electrode 415 at two ends of each gray-scale control unit 41 in the gray-scale adjusting layer, the electrophoretic particles 412 in the gray-scale control units 41 are controlled to move, so as to further realize shielding of different light areas, thereby achieving the purpose of gray-scale adjustment of the display panel. Compared with the prior art, the gray scale of the display screen is adjusted only by a PWM method with alternating brightness, and the application does not cause visual fatigue of users.
In some embodiments, the gray scale regions 413 adjacent to the memory pillars 411 of the memory pillars 411 form the gray scale control subunits 42, and the electrophoretic particles 412 within the plurality of gray scale control subunits 42 have different masses or charge numbers.
Specifically, the storage column 411 and the gray scale region 413 adjacent along a certain direction form a gray scale control subunit 42, and the mass or the charge number of the electrophoretic particles 412 in the gray scale control subunit 42 are different, so that the driving voltages required for driving the electrophoretic particles 412 in different gray scale control subunits 42 are different. To control the movement of the electrophoretic particles 412 in the different gray scale control subunits 42, i.e. to control the gray scale adjustment of the gray scale control unit 41, by controlling the magnitude of the driving voltage. When the driving voltages are the same, the moving speeds of the electrophoretic particles 412 in the different gray scale control subunits 42 are different, and the shading effects of the different gray scale control subunits 42 are different, so that the gray scale adjustment of the gray scale control unit 41 can be controlled. The accuracy of the gray scale adjustment of the picture display is improved.
In some embodiments, one side of the storage column 411 is provided with a storage region 416, the storage region 416 being used to store the electrophoretic particles 412.
Specifically, as shown in fig. 1, a step region is provided at one side of the storage column 411 to form a storage region 416 in which the electrophoretic particles 412 are stored. When no voltage is generated between the positive electrode 414 and the negative electrode 415, the electrophoretic particles 412 are located in the storage area 416 and do not move to the gray scale area 413, that is, the electrophoretic particles 412 do not affect the light projected by the gray scale area 413 at this time, and the picture is displayed as a high gray scale display. After a voltage is generated between the positive electrode 414 and the negative electrode 415, the electrophoretic particles 412 are moved from the storage region 416 to the gray-scale region 413 to block light passing through the gray-scale region 413.
In some embodiments, a plurality of anodes 14 are disposed on the driving back plate, the plurality of anodes 14 are in one-to-one correspondence with the plurality of light emitting units, and the anodes 14 are disposed to protrude toward one side of the light emitting units.
The anode 14 is made of Indium Tin Oxide (ITO) or a mixture of silver and indium tin oxide (Ag/ITO) and has a reflecting effect.
A reflective layer 417 is disposed at a side of the bottom of the storage area 416 facing the light emitting unit, and light emitted from the light emitting unit is reflected by the reflective layer 417 and the anode 14 in order and then emitted from the light emitting side.
Specifically, when no voltage is generated between the positive electrode 414 and the negative electrode 415, the electrophoretic particles 412 are located in the storage region 416, and light cannot be emitted through the storage region 416 because the electrophoretic particles 412 have a shielding effect on the light. The bottom of the storage area 416 is provided with the reflecting layer 417 towards one side of the light emitting unit, when light irradiates the storage area 416, the light is reflected to the anode 14 through the reflecting layer 417, and because the anode 14 is arranged in a non-planar mode and protrudes towards one side of the light emitting unit, the light reflected to the anode 14 cannot be reflected to the reflecting layer 417 at the bottom of the storage area 416 according to an original path, and can be deflected at a certain angle and then reflected to the gray scale area 413, and finally the gray scale adjusting layer is emitted. The light utilization rate is improved, and the light waste is avoided.
In some embodiments, the driving back plate includes a substrate 11, a first driving circuit 12 formed on the substrate 11, a planarization layer 13 covering the first driving circuit 12, and a plurality of anodes 14 located on a side of the planarization layer 13 facing away from the substrate 11, a plurality of protrusions 131 are formed on a side of the planarization layer 13 facing away from the substrate 11, and the anodes 14 cover the protrusions 131.
The substrate base 11 is mainly used for supporting a display panel, and is generally made of an insulating material of polymer resin (polyethersulfone (PES), polyacrylate (PA), polyarylate (PAR), polyetherimide (PEI), polyethylene naphthalate (PEN), polyethylene terephthalate (PET), polyphenylene sulfide (PPS), polyallylate (polyallylate), polyimide (PI), polycarbonate (PC), cellulose triacetate (CAT), cellulose Acetate Propionate (CAP), or a combination thereof.
The first driving circuit 12 includes a first gate layer 121, a first source layer 122, and a first drain layer 123, where the material of the first gate layer 121 may be metals such as Al, cu, mo, etc.; the first source layer 122 and the first drain layer 123 may be made of Al, cu, mo, or other metals. The planarization layer 13 is made of an organic material PI.
It should be noted that the substrate 11 is provided with a buffer layer 15, which may be made of silicon nitride SiNx or silicon oxide SiOx; the buffer layer 15 is provided with a first semiconductor layer 16, which may be made of polysilicon; a first gate insulating layer 17 is disposed between the first gate layer 121 and the first semiconductor layer 16, and may be silicon nitride SiNx or silicon oxide SiOx; an insulating dielectric layer 18 is disposed between the first gate layer 121 and the first source layer 122/the first drain layer 123, and is made of silicon nitride SiNx and silicon oxide SiOx.
The display panel further includes a pixel defining layer between the anode 14 and the encapsulation layer 30.
The bump 131 is prepared on the planarization layer 13, and the anode 14 is covered on the bump 131, so that the anode 14 forms a convex portion, increasing the stability of the shape of the anode 14.
In some embodiments, the light emitting unit includes a cathode 211, the gray scale adjusting layer further includes a second driving circuit electrically connected to the driving back plate, the second driving circuit is located between two adjacent gray scale control units 41, a positive electrode 414 is electrically connected to the second driving circuit, and a negative electrode 415 is electrically connected to the cathode 211.
The second driving circuit includes a second gate layer 431, a second source layer 432 and a second drain layer 433, wherein the material of the second gate layer 431 may be metal such as Al, cu, mo, etc.; the second source layer 432 and the second drain layer 433 may be made of Al, cu, mo, or other metals. A second gate insulating layer 434 and a second semiconductor layer 435 are sequentially formed between the second gate layer 431 and the second source layer 432 and between the second drain layer 433, the second gate layer 431 may be made of silicon nitride SiNx or silicon oxide SiOx, and the second semiconductor layer 435 may be made of polysilicon or amorphous silicon.
The second driving circuit is used to control the voltage between the positive electrode 414 and the negative electrode 415 to drive the electrophoretic particles 412. The second source layer 432 has one end electrically connected to the positive electrode 414 and the other end electrically connected to the data line in the driving back plate, and the negative electrode 415 is electrically connected to the cathode 211 to acquire a cathode 211 signal.
In this embodiment, by disposing a gray-scale adjusting layer in the display panel and disposing a positive electrode 414 and a negative electrode 415 at two ends of each gray-scale control unit 41 in the gray-scale adjusting layer, the electrophoretic particles 412 in the gray-scale control units 41 are controlled to move, so as to further realize shielding of different light areas, thereby achieving the purpose of gray-scale adjustment of the display panel. Compared with the prior art, the gray scale of the display screen is adjusted only by a PWM method with alternating brightness, and the application does not cause visual fatigue of users. The quality or the number of charges of the electrophoretic particles 412 in the gray scale control subunit 42 are different, so as to improve the accuracy of gray scale adjustment of the display. The anode 14 is provided with a shape called a protrusion toward the light emitting unit, and a reflective layer 417 is provided at a side of the bottom of the storage region 416 toward the light emitting unit, and when light is irradiated to the storage region 416, the light reflected to the protrusion of the anode 14 through the reflective layer 417 is deflected at a certain angle and then reflected to the gray scale region 413, and finally emitted to the gray scale adjustment layer. The light utilization rate is improved, and the light waste is avoided.
Second embodiment
Fig. 2 is a flowchart illustrating a method for manufacturing a display panel according to a second embodiment of the present application; fig. 3 is a schematic structural diagram corresponding to a flow of a method for manufacturing a display panel according to a second embodiment of the present application.
As shown in fig. 2, the present application provides a method for manufacturing a display panel according to the first embodiment, including:
step S101: a drive back plate is provided.
The driving backboard can be any one of a low-temperature polysilicon driving backboard, an amorphous silicon driving backboard, an indium gallium zinc oxide driving backboard and the like. The low-temperature polysilicon driving backboard is formed on the glass substrate through processes such as film forming, photoetching, etching and the like.
Step S102: and forming a light-emitting functional layer on the driving backboard, wherein the light-emitting functional layer comprises a plurality of light-emitting units distributed in an array.
Step S103: and forming an encapsulation layer on one side of the light-emitting functional layer, which is away from the driving backboard.
As shown in fig. 3, the encapsulation layer 30 covers the light emitting function layer 20, and the encapsulation layer 30 includes a first inorganic layer (not shown in the drawing), an organic layer (not shown in the drawing), and a second inorganic layer (not shown in the drawing) which are sequentially disposed in a direction away from the driving back plate.
Step S104: a gray scale adjusting layer is formed on one side of the encapsulation layer 30 away from the light emitting functional layer 20, the gray scale adjusting layer includes a plurality of gray scale control units 41 corresponding to the light emitting units one by one, the gray scale control units 41 include a plurality of storage columns 411 distributed at intervals and electrophoretic particles 412 located between two adjacent storage columns 411, and a gray scale region 413 is formed between two adjacent storage columns 411.
Step S105: a positive electrode 414 and a negative electrode 415 are formed on the storage columns 411 at both ends of the gray-scale control unit 41, respectively; wherein, according to the gray signal, a voltage is generated between the positive electrode 414 and the negative electrode 415 to drive the plurality of electrophoretic particles 412 to move in the corresponding gray scale region 413 and shade at least part of the gray scale region 413, so as to form different gray scale displays.
The front projection of the light emitting unit on the driving back plate overlaps with the front projection of the gray-scale control unit 41 on the driving back plate. The positive electrode 414 and the negative electrode 415 may be directly evaporated on the outer sides of the storage posts 411 at the two most ends in the gray scale control unit 41, or the electrode posts 418 may be separately provided on the outer sides of the storage posts 411 at the two most ends, so that the positive electrode 414 and the negative electrode 415 are respectively evaporated on the electrode posts 418.
In this embodiment, a gray-scale adjusting layer is formed on the encapsulation layer 30, and a positive electrode 414 and a negative electrode 415 are disposed at two ends of each gray-scale control unit 41 in the gray-scale adjusting layer to control the movement of the electrophoretic particles 412 in the gray-scale control units 41, so as to realize shielding of different light areas, thereby achieving the purpose of gray-scale adjustment of the display panel. Compared with the prior art, the gray scale of the display screen is adjusted only by a PWM method with alternating brightness, and the application does not cause visual fatigue of users.
Specifically, the gray scale regions 413 adjacent to the storage columns 411 and the storage columns 411 form the gray scale control subunits 42, and the electrophoretic particles 412 in the plurality of gray scale control subunits 42 have different masses or charge numbers. The different masses or charge numbers of the electrophoretic particles 412 within the gray scale control subunit 42 cause the different driving voltages required to drive the electrophoretic particles 412 in different gray scale control subunits 42. To control the movement of the electrophoretic particles 412 in the different gray scale control subunits 42, i.e. to control the gray scale adjustment of the gray scale control unit 41, by controlling the magnitude of the driving voltage. When the driving voltages are the same, the moving speeds of the electrophoretic particles 412 in the different gray scale control subunits 42 are different, and the shading effects of the different gray scale control subunits 42 are different, so that the gray scale adjustment of the gray scale control unit 41 can be controlled. The accuracy of the gray scale adjustment of the picture display is improved.
In some embodiments, step S101: providing a drive back plate, specifically comprising:
Step S1011: a substrate base 11 is provided.
The substrate base 11 is mainly used for supporting a display panel, and is generally made of an insulating material of polymer resin (polyethersulfone (PES), polyacrylate (PA), polyarylate (PAR), polyetherimide (PEI), polyethylene naphthalate (PEN), polyethylene terephthalate (PET), polyphenylene sulfide (PPS), polyallylate (polyallylate), polyimide (PI), polycarbonate (PC), cellulose triacetate (CAT), cellulose Acetate Propionate (CAP), or a combination thereof.
Step S1012: the first driving circuit 12 is formed on the substrate 11.
The first driving circuit 12 includes a first gate layer 121, a first source layer 122, and a first drain layer 123, where the material of the first gate layer 121 may be metals such as Al, cu, mo, etc.; the first source layer 122 and the first drain layer 123 may be made of Al, cu, mo, or other metals. The planarization layer 13 is made of an organic material PI.
Step S1013: a planarization layer 13 is formed on the first driving circuit 12, and a plurality of protrusions 131 are formed on a side of the planarization layer 13 facing away from the substrate 11.
Step S1014: a plurality of anodes 14 are formed on a side of the planarization layer 13 facing away from the substrate 11, the anodes 14 cover the protrusions 131, and the plurality of anodes 14 are in one-to-one correspondence with the plurality of light emitting units.
The anode 14 is made of Indium Tin Oxide (ITO) or a mixture of silver and indium tin oxide (Ag/ITO) and has a reflecting effect. The anode 14 is used to drive the light emitting unit.
In the present embodiment, the bump 131 is formed on the planarizing layer 13 such that the anode 14 is covered on the bump 131 to form the anode 14 into a convex portion, increasing the stability of the shape of the anode 14.
In some embodiments, the step S104 of forming a gray-scale adjustment layer on a side of the encapsulation layer 30 facing away from the light-emitting functional layer 20 further includes:
Step S1041: a storage area 416 is disposed at one side of the storage column 411, the storage column 411 is a light-transmitting column, and the storage area 416 is used for storing the electrophoretic particles 412.
Step S1042: a reflective layer 417 is disposed at a bottom of the storage region 416 toward one side of the light emitting unit, so that light emitted from the light emitting unit is sequentially reflected by the reflective layer 417 and the anode 14 and then emitted from the light emitting side.
In this embodiment, by disposing the reflective layer 417 at the bottom of the storage area 416, when the light irradiates the storage area 416, the light is reflected to the anode 14 through the reflective layer 417, and since the anode 14 protrudes to one side of the light emitting unit, the light reflected to the anode 14 is not reflected to the reflective layer 417 at the bottom of the storage area 416 according to the original path, but is deflected at a certain angle and then reflected to the gray scale area 413, and finally, the gray scale adjustment layer is emitted. The light utilization rate is improved, and the light waste is avoided.
Third embodiment
Fig. 4 is a flowchart illustrating a driving method of a display panel according to a third embodiment of the present application.
As shown in fig. 4, a third embodiment of the present application provides a driving method of a display panel as mentioned in the first embodiment, including:
Step S201: a gray signal of the display panel is acquired.
Step S202: according to the gray signal, controlling voltage between positive electrode and negative electrode of gray control unit of gray regulating layer to drive multiple electrophoretic particles to move in corresponding gray region and shade at least part of gray region so as to form different gray display.
In this embodiment, by acquiring a gray signal of the display panel and controlling a voltage generated between the positive electrode and the negative electrode of the gray control unit of the gray adjustment layer according to the gray signal, the plurality of electrophoretic particles are driven to move in the corresponding gray areas and shade at least part of the gray areas, so as to form different gray display.
It should be readily understood that the terms "on … …", "above … …" and "above … …" in this disclosure should be interpreted in the broadest sense so that "on … …" means not only "directly on something" but also includes "on something" with intermediate features or layers therebetween, and "above … …" or "above … …" includes not only the meaning "on something" or "above" but also the meaning "above something" or "above" without intermediate features or layers therebetween (i.e., directly on something).
The term "layer" as used herein may refer to a portion of material that includes regions having a certain thickness. The layer may extend over the entire underlying or overlying structure, or may have a range that is less than the range of the underlying or overlying structure. Further, the layer may be a region of a continuous structure, either homogenous or non-homogenous, having a thickness less than the thickness of the continuous structure. For example, the layer may be located between the top and bottom surfaces of the continuous structure or between any pair of lateral planes at the top and bottom surfaces. The layers may extend laterally, vertically and/or along a tapered surface. The substrate base may be a layer, may include one or more layers therein, and/or may have one or more layers located thereon, and/or thereunder. The layer may comprise a plurality of layers. For example, the interconnect layer may include one or more conductors and contact layers (within which contacts, interconnect lines, and/or vias are formed) and one or more dielectric layers.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application.
Claims (6)
1. The utility model provides a display panel, includes the drive backplate and form in proper order in luminous functional layer and encapsulation layer on the drive backplate, luminous functional layer includes a plurality of light emitting unit of array distribution, its characterized in that, display panel still includes:
The gray scale adjusting layer is positioned on one side of the packaging layer, which is away from the luminous functional layer, the gray scale adjusting layer comprises a plurality of gray scale control units corresponding to the luminous units one by one, the gray scale control units comprise a plurality of light-transmitting storage columns and a plurality of electrophoretic particles positioned between two adjacent storage columns, which are distributed at intervals, a gray scale area is formed between the two adjacent storage columns, the outer sides of the storage columns positioned at the two ends of the gray scale control units are respectively provided with a positive electrode and a negative electrode,
The method comprises the steps of controlling a positive electrode and a negative electrode to generate voltage according to gray signals, driving a plurality of electrophoretic particles to move in a corresponding gray scale area and shielding at least part of the gray scale area so as to form different gray scale displays;
a storage area is arranged on one side of the storage column and is used for storing the electrophoresis particles;
The driving backboard is provided with a plurality of anodes, the anodes are in one-to-one correspondence with the light-emitting units, and the anodes are arranged in a protruding way towards one side of the light-emitting units;
The bottom of the storage area is provided with a reflecting layer towards one side of the light-emitting unit, and light rays emitted by the light-emitting unit are emitted from the light-emitting side after being reflected by the reflecting layer and the anode in sequence.
2. The display panel of claim 1, wherein the gray scale regions of the memory pillars adjacent to the memory pillars form gray scale control subunits, and wherein the electrophoretic particles within the plurality of gray scale control subunits differ in mass or charge number.
3. The display panel according to claim 1, wherein the driving back plate includes a substrate base plate, a first driving circuit formed on the substrate base plate, a planarizing layer covering the first driving circuit, and a plurality of the anodes on a side of the planarizing layer facing away from the substrate base plate, a plurality of projections being formed on a side of the planarizing layer facing away from the substrate base plate, the anodes covering the projections.
4. The display panel according to claim 1, wherein the light emitting unit includes a cathode, the gray scale adjusting layer further includes a second driving circuit electrically connected to the driving back plate, the second driving circuit is located between two adjacent gray scale control units, the positive electrode is electrically connected to the second driving circuit, and the negative electrode is electrically connected to the cathode.
5. A method of manufacturing the display panel according to any one of claims 1 to 4, comprising:
Providing a driving backboard;
forming a light-emitting functional layer on the driving backboard, wherein the light-emitting functional layer comprises a plurality of light-emitting units distributed in an array;
forming a packaging layer on one side of the light-emitting functional layer, which is away from the driving backboard;
a gray scale adjusting layer is formed on one side, away from the light-emitting functional layer, of the packaging layer, the gray scale adjusting layer comprises a plurality of gray scale control units which are in one-to-one correspondence with the plurality of light-emitting units, each gray scale control unit comprises a plurality of storage columns and electrophoretic particles, the storage columns are distributed at intervals, the electrophoretic particles are located between two adjacent storage columns, and a gray scale area is formed between the two adjacent storage columns;
Forming a positive electrode and a negative electrode on the storage columns at two ends of the gray scale control unit respectively; the method comprises the steps of controlling a positive electrode and a negative electrode to generate voltage according to gray signals, driving a plurality of electrophoretic particles to move in a corresponding gray scale area and shielding at least part of the gray scale area so as to form different gray scale displays;
wherein, the providing a driving backboard includes:
providing a substrate;
Forming a first driving circuit on the substrate base plate;
Forming a planarization layer on the first driving circuit, wherein a plurality of protrusions are formed on one side of the planarization layer, which faces away from the substrate;
Forming a plurality of anodes on one side of the planarization layer, which is away from the substrate, wherein the anodes cover the protrusions, and the anodes are in one-to-one correspondence with the light-emitting units;
the gray scale adjusting layer is formed on one side of the packaging layer, which is far away from the light emitting function layer, and the method further comprises the following steps:
a storage area is arranged on one side of the storage column, the storage column is a light-transmitting column body, and the storage area is used for storing the electrophoresis particles;
and a reflecting layer is arranged at one side of the bottom of the storage area, which faces the light-emitting unit, so that light rays emitted by the light-emitting unit are emitted from the light-emitting side after being reflected by the reflecting layer and the anode in sequence.
6. A driving method of the display panel according to any one of claims 1 to 4, comprising:
Acquiring a gray signal of a display panel;
According to the gray signal, controlling voltage generated between positive electrode and negative electrode of gray control unit of gray adjusting layer, driving the multiple electrophoretic particles to move in the corresponding gray area and shielding at least part of gray area, so as to form different gray display.
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| JP6865575B2 (en) * | 2016-12-26 | 2021-04-28 | イー インク コーポレイション | Display devices, display device drive methods and electronic devices |
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