CN112509470A - Rollable display panel and rollable display device - Google Patents
Rollable display panel and rollable display device Download PDFInfo
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- CN112509470A CN112509470A CN202011379489.XA CN202011379489A CN112509470A CN 112509470 A CN112509470 A CN 112509470A CN 202011379489 A CN202011379489 A CN 202011379489A CN 112509470 A CN112509470 A CN 112509470A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/301—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements flexible foldable or roll-able electronic displays, e.g. thin LCD, OLED
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/549—Organic PV cells
Abstract
The embodiment of the invention discloses a rollable display panel and a rollable display device. The rollable display panel comprises a flexible substrate, a driving array layer, a light emitting device layer and a pressure-sensitive functional layer, wherein the driving array layer is positioned on one side of the flexible substrate; the light emitting device layer is positioned on one side of the driving array layer away from the flexible substrate; the pressure-sensitive functional layer is located between the flexible substrate and the light emitting device layer, the pressure-sensitive functional layer extends from a first side to a second side of the display panel, the first side and the second side of the display panel are arranged along a curling direction of the display panel, and the pressure-sensitive functional layer includes at least one of: the resistance type pressure-sensitive functional layer and the capacitance type pressure-sensitive functional layer are characterized in that the resistance value and/or the capacitance value of the pressure-sensitive functional layer are/is changed along with the curling length of the display panel. The technical scheme of the embodiment of the invention can realize the detection of the extension length of the rollable display panel and can reduce the thickness and the volume of the display device.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a rollable display panel and a rollable display device.
Background
In order to meet the requirements of users for large screen, large visual field and convenient carrying, a rollable display device is produced. Rollable display devices generally comprise a flexible screen, the smaller the radius of the flexible screen when rolled, the smaller the volume of the rollable display device and thus the more convenient it is to carry. The flexible display panel is carried by being folded or rolled on a roll (roll) to reduce the overall size of the flexible display device; making flexible displays of great interest.
In the process of unfolding and winding the flexible display panel, a user does not always unfold the flexible display panel completely when using the flexible display panel, and the area of an image display area can be changed; it is currently not possible to determine the area of the region where the image needs to be displayed.
Disclosure of Invention
Embodiments of the present invention provide a rollable display panel and a rollable display device, so as to implement detection of an extended length of the rollable display panel, and reduce thickness and volume of the display device without manufacturing an external slide rheostat or other device outside the display panel.
In a first aspect, an embodiment of the present invention provides a rollable display panel, including:
a flexible substrate;
a driving array layer positioned at one side of the flexible substrate;
the light-emitting device layer is positioned on one side, far away from the flexible substrate, of the driving array layer;
a pressure sensitive functional layer between the flexible substrate and the light emitting device layer, the pressure sensitive functional layer extending from a first side to a second side of the display panel, the first and second sides of the display panel being arranged along a curling direction of the display panel, the pressure sensitive functional layer comprising at least one of: the resistance type pressure-sensitive functional layer and the capacitance type pressure-sensitive functional layer are characterized in that the resistance value and/or the capacitance value of the pressure-sensitive functional layer are/is changed along with the curling length of the display panel. The resistance value or the capacitance value of the pressure-sensitive functional layer can be changed along with the extension length of the rollable display panel so as to realize the detection of the extension length of the rollable display panel, and devices such as an external slide rheostat and the like do not need to be manufactured outside the display panel, so that the thickness and the volume of the display device can be reduced.
Furthermore, the resistive pressure-sensitive functional layer comprises at least one resistive pressure-sensitive unit, the resistive pressure-sensitive unit is in a strip shape, and the resistive pressure-sensitive unit extends from the first side to the second side of the display panel.
Furthermore, the resistance type pressure-sensitive functional layer is arranged in the driving array layer, and the resistance type pressure-sensitive unit extends along the curling direction of the display panel;
the plurality of data lines in the driving array layer extend along the curling direction of the display panel, and the resistance type pressure sensing unit and the plurality of data lines are arranged along the curling direction vertical to the display panel;
the resistance type pressure sensing unit and the data lines are arranged on the same layer, so that the thickness of the display panel can be reduced.
Furthermore, the resistive pressure sensing unit is provided with a plurality of through holes arranged along the curling direction of the display panel, and the through holes extend along the thickness direction of the display panel. Through set up the through-hole on resistance-type pressure sensing unit, can reduce the stress in the screen body when curling display panel.
Furthermore, a plurality of bulges are arranged on two sides of the resistance-type pressure sensing unit, the bulges positioned on the same side of the resistance-type pressure sensing unit are arranged along the extending direction of the resistance-type pressure sensing unit, and the arrangement direction of the two sides of the resistance-type pressure sensing unit, which are provided with the bulges, is vertical to the thickness direction of the display panel. The stress in the screen body when the display panel is curled can be reduced by arranging the bulge on the resistance type pressure sensing unit.
Furthermore, the number of the resistive pressure sensing units is one, the driving array layer is further provided with a first conductive wire, a second conductive wire, a third conductive wire, a high-potential signal transmission line and a low-potential signal transmission line, the extending directions of the first conductive wire, the second conductive wire and the third conductive wire and the resistive pressure sensing units are the same, the first end of the first conductive wire is electrically connected with the first end of the resistive pressure sensing unit, and the second end of the first conductive wire and one of the second ends of the resistive pressure sensing unit are electrically connected with the high-potential signal transmission line; the second end of the first conductive wire and the other one of the second ends of the resistance type pressure sensing units are electrically connected with the low-potential signal transmission line;
one of the first end of the second conductive line and the second end of the third conductive line is electrically connected with the high-potential signal transmission line; the other of the second end of the second conductive line and the second end of the third conductive line is electrically connected to the low potential signal transmission line;
the first end of the first conductive wire, the first end of the second conductive wire, the first end of the third conductive wire and the first end of the resistance type pressure sensing unit are positioned at the first side of the display panel; the second end of the first conductive wire, the second end of the second conductive wire, the second end of the third conductive wire and the second end of the resistive pressure sensing unit are positioned at the second side of the display panel.
Further, the resistance pressure-sensitive functional layer comprises a metal layer and an adhesive layer,
the adhesive layer is located between the flexible substrate and the metal layer, and the metal layer includes a nano metal layer or a micro metal layer, so that the metal layer is soft enough to deform in the curling process of the display panel.
Further, the metal layer comprises at least one of the following materials: aluminum, steel, iron, and tin.
In a second aspect, an embodiment of the present invention further provides a rollable display device, including: the display panel comprises a detection module, a processing module and a rollable display panel provided by any embodiment of the invention, wherein the detection module is electrically connected with a pressure-sensitive functional layer and the processing module; the processing module is used for determining the unfolding length of the display panel according to the detection value of the detection module.
Further, when the driving array layer is further provided with a first conductive wire, a second conductive wire, a third conductive wire, a high-potential signal transmission line and a low-potential signal transmission line, the detection module comprises a differential amplification circuit, and a first input end of the differential amplification circuit is electrically connected with a first end of the resistance-type pressure sensing unit; a second input end of the differential amplification circuit is electrically connected with a first end of the second conductive wire; the output end of the differential amplifying circuit is electrically connected with the processing module. The differential amplifying circuit can amplify the detection signal to improve the detection sensitivity and avoid the situation that the change rate of the resistance value of the resistance-type pressure sensing unit is small and the change rate of the voltage value is small when the display panel is curled.
The rollable display panel in the technical scheme of the embodiment of the invention comprises a flexible substrate, a driving array layer, a light-emitting device layer and a pressure-sensitive functional layer, wherein the driving array layer is positioned on one side of the flexible substrate; the light emitting device layer is positioned on one side of the driving array layer away from the flexible substrate; the pressure-sensitive functional layer is located between the flexible substrate and the light emitting device layer, the pressure-sensitive functional layer extends from a first side to a second side of the display panel, the first side and the second side of the display panel are arranged along a curling direction of the display panel, and the pressure-sensitive functional layer includes at least one of: the resistance and/or capacitance values of the pressure-sensitive functional layer can change along with the curling length of the display panel, namely the resistance and/or capacitance values of the pressure-sensitive functional layer can change along with the unfolding length of the rollable display panel, so that the detection of the unfolding length of the rollable display panel is realized, external devices such as a slide rheostat do not need to be manufactured outside the display panel, and the thickness and the volume of the display device can be reduced.
Drawings
Fig. 1 is a schematic top view of a rollable display panel according to an embodiment of the present invention when the rollable display panel is fully unfolded;
fig. 2 is a schematic structural view of a rollable display panel according to an embodiment of the present invention when partially rolled;
fig. 3 is a schematic cross-sectional view of a rollable display panel according to an embodiment of the present invention, taken along the direction A1a2 when the rollable display panel is fully unfolded;
FIG. 4 is a schematic top view of a rollable display panel according to an embodiment of the present invention when fully unrolled;
FIG. 5 is a schematic top view of a rollable display panel according to an embodiment of the present invention when fully unrolled;
FIG. 6 is a schematic top view of a rollable display panel according to an embodiment of the present invention when fully unrolled;
FIG. 7 is an equivalent circuit schematic;
FIG. 8 is a schematic cross-sectional view of a rollable display panel according to an embodiment of the present invention taken along the direction A1A2 when the rollable display panel is fully unfolded;
fig. 9 is a schematic partial cross-sectional view illustrating a rollable display panel according to an embodiment of the present invention;
FIG. 10 is a schematic cross-sectional view of a rollable display panel according to an embodiment of the present invention taken along the direction A1A2 when the rollable display panel is fully unfolded;
fig. 11 is a schematic structural diagram of a rollable display device according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
The embodiment of the invention provides a rollable display panel. Fig. 1 is a schematic top view of a rollable display panel according to an embodiment of the present invention when the rollable display panel is fully unfolded. Fig. 2 is a schematic structural diagram of a rollable display panel according to an embodiment of the present invention when partially rolled. Fig. 3 is a schematic cross-sectional view of a rollable display panel according to an embodiment of the present invention, taken along the direction A1a2 when the rollable display panel is completely unrolled. The rollable display panel 1 includes: a flexible substrate 10, a driving array layer 20, a light emitting device layer 30, and a pressure sensitive functional layer 40.
Wherein, the driving array layer 20 is positioned at one side of the flexible substrate 10; the light emitting device layer 30 is positioned on the side of the driving array layer 20 away from the flexible substrate 10; the pressure-sensitive functional layer is located between the flexible substrate 10 and the light emitting device layer 30, and the pressure-sensitive functional layer 40 extends from a first side to a second side of the display panel 1, the first side and the second side of the display panel 1 being arranged in the curling direction X of the display panel 1. The pressure-sensitive functional layer 40 includes at least one of: the resistance type pressure-sensitive functional layer and the capacitance type pressure-sensitive functional layer are characterized in that the resistance value and/or the capacitance value of the pressure-sensitive functional layer are/is changed along with the curling length of the display panel.
The display panel 1 may be an organic light emitting display panel. The flexible substrate 10 may include at least one of the following materials: polyimide (PI), Polyethersulfone (PES), Polyacrylate (PAR), Polyetherimide (PEI), polyethylene naphthalate (PEN), polyethylene terephthalate (PET), polyphenylene sulfide (PPS), polyallylate (polyallylate), Polycarbonate (PC), cellulose Triacetate (TAC), Cellulose Acetate Propionate (CAP), acrylate (acryl), and the like. The driving array layer 20 can be used to form a plurality of pixel driving circuits (any pixel driving circuit includes a driving transistor, a switching transistor, a storage capacitor, and the like), a scanning driving circuit, a data driving circuit, a light emitting control circuit, a scanning line, a data line, a light emitting control line, a power line, and the like. The light emitting device layer 30 may be used to form a plurality of light emitting devices distributed in an array, for example, the light emitting devices may be organic light emitting diodes. Alternatively, the pressure sensitive functional layer 40 may be located between the flexible substrate 10 and the driving array layer 20. The pressure sensitive functional layer 40 may be further stacked with at least some of the driving array layer 20 and the light emitting device layer 30.
The resistance value of the resistive pressure-sensitive functional layer can change along with the change of the extension length L (or the curling length) of the rollable display panel. When the display panel is rolled, the rolled portion of the resistive pressure sensitive functional layer is deformed by the stress of the rolling, and the sectional area is reduced, and the length is increased, thereby increasing the resistance value. The voltage or current of the resistive pressure sensitive functional layer can be detected by providing a power supply, a detection circuit, and the like to obtain the development length L of the rollable display panel, and further, an image is displayed in the developed area of the display panel, and no image is displayed in the curled area.
The capacitance value of the capacitive pressure sensitive functional layer can be changed along with the change of the extension length L (or the rolling length) of the rollable display panel. When the display panel is curled, the curled part of the capacitive pressure sensitive functional layer is deformed under the action of curling stress, so that the thickness is reduced, the length is lengthened, namely, the distance between two electrodes of the equivalent capacitor along the thickness direction of the display panel is reduced, the facing area is increased, and the capacitance value is increased. The voltage, current, or the like of the capacitive pressure sensitive functional layer can be detected by providing a power supply, a detection circuit, or the like, so as to obtain the development length L of the rollable display panel, and further, an image is displayed in the developed area of the display panel, and no image is displayed in the curled area.
The rollable display panel in the technical scheme of the embodiment comprises a flexible substrate, a driving array layer, a light emitting device layer and a pressure-sensitive functional layer, wherein the driving array layer is positioned on one side of the flexible substrate; the light emitting device layer is positioned on one side of the driving array layer away from the flexible substrate; the pressure-sensitive functional layer is located between the flexible substrate and the light emitting device layer, the pressure-sensitive functional layer extends from a first side to a second side of the display panel, the first side and the second side of the display panel are arranged along a curling direction of the display panel, and the pressure-sensitive functional layer includes at least one of: the resistance and/or capacitance values of the pressure-sensitive functional layer can change along with the curling length of the display panel, namely the resistance and/or capacitance values of the pressure-sensitive functional layer can change along with the unfolding length of the rollable display panel, so that the detection of the unfolding length of the rollable display panel is realized, external devices such as a slide rheostat do not need to be manufactured outside the display panel, and the thickness and the volume of the display device can be reduced.
Optionally, on the basis of the above embodiment, fig. 4 is a schematic top view structure diagram of a completely unfolded rollable display panel according to an embodiment of the present invention, where the resistive pressure-sensitive functional layer 41 includes at least one resistive pressure-sensitive unit 411. Optionally, the resistive pressure sensing unit 411 is in a shape of a bar. The resistive pressure sensing unit 411 extends from the first side to the second side of the display panel 1. Alternatively, the resistive pressure sensing unit 411 extends along the curling direction X of the display panel 1, i.e., the extending direction of the resistive pressure sensing unit 411 is parallel to the curling direction X of the display panel 1. The widths of the resistive pressure sensing units 411 may be equal, and the resistance values of the resistive pressure sensing units 411 have the same change rate when the display panel is curled.
Alternatively, on the basis of the above embodiment, with continuing reference to fig. 4, the resistive pressure-sensing functional layer 41 may further include a plurality of resistive pressure-sensing units 411 arranged side by side. Fig. 4 exemplarily shows a case where the number of the resistive pressure sensing units 411 is 2. The plurality of resistive pressure sensing units 411 may be disposed in the same layer. Alternatively, the plurality of resistive pressure sensing units 411 may be connected in series and/or in parallel. The plurality of resistive pressure sensing units 411 may be connected in series to increase a rate of change in resistance value when the display panel is curled. Alternatively, the extending direction of the resistive pressure sensing unit 411 may be inclined with respect to the curling direction X of the display panel 1, for example, the extending direction of the resistive pressure sensing unit 411 may be parallel to the extending direction of the diagonal line of the display panel 1. Optionally, the resistive pressure sensing unit 411 is of a broken line type or a zigzag type. The number, shape and connection relationship of the resistive pressure sensing units 411 may be set as required, which is not limited in the embodiment of the present invention.
The resistance value of the resistive pressure sensing unit 411 may vary with the extension length L (or the curling length) of the rollable display panel. For example, if the number of the resistive pressure sensing units 411 in the resistive pressure sensing functional layer 41 is 1, a constant current may be input to the resistive pressure sensing units 411, and the voltage across the resistive pressure sensing units 411 may be detected, so as to determine the extension length L of the rollable display panel according to the voltage across the resistive pressure sensing units 411. The smaller the development length L of the rollable display panel, that is, the larger the rolling length of the rollable display panel, the larger the resistance of the resistive pressure sensing unit 411, and the larger the voltage across the resistive pressure sensing unit 411. For example, if the number of the resistive pressure sensing units 411 in the resistive pressure sensing functional layer 41 is 1, a constant voltage may be applied to both ends of the resistive pressure sensing unit 411, and the current of the resistive pressure sensing unit 411 may be detected, so as to determine the unrolling length L of the rollable display panel according to the detected current of the resistive pressure sensing unit 411. The smaller the unwound length L of the rollable display panel, that is, the larger the rolled length of the rollable display panel, the larger the resistance of the resistive pressure sensing unit 411, and the smaller the current of the resistive pressure sensing unit 411.
Alternatively, on the basis of the above embodiment, fig. 5 is a schematic top view structure diagram of a rollable display panel provided in an embodiment of the present invention when the rollable display panel is completely unrolled, a plurality of through holes 412 arranged along the rolling direction X of the display panel 1 are disposed on the resistive pressure sensing unit 411, and the through holes 412 extend along the thickness direction Z of the display panel 1.
Optionally, the through holes 412 are arranged at equal intervals. The cross-section of the through-hole 412 may be circular, rectangular, etc. By providing the through hole 412 on the resistive pressure sensing unit 411, the stress in the panel body when the display panel is curled can be reduced. The greater the number of through holes 412, the less stress in the screen body when the display panel is rolled. The greater the number of the through holes 412, the smaller the rate of change in the resistance value when the display panel is rolled.
Alternatively, on the basis of the above embodiment, fig. 6 is a schematic top view structure diagram of a rollable display panel provided by an embodiment of the present invention when the rollable display panel is completely unrolled, two sides of the resistive pressure sensing unit 411 are provided with a plurality of protrusions 413, the protrusions 413 located on the same side of the resistive pressure sensing unit 411 are arranged along the extending direction of the resistive pressure sensing unit 411, and the arrangement direction of the two sides of the resistive pressure sensing unit 411 provided with the protrusions 413 is perpendicular to the thickness direction of the display panel 1.
Alternatively, the plurality of protrusions 413 on each side of the resistive pressure sensing unit 411 are arranged at equal intervals. The protrusion 413 may be arc-shaped, and may be, for example, semicircular. As shown in fig. 6, the resistive pressure sensing unit 411 may have a twisted wire shape. By providing the protrusion 413 on the resistive pressure sensing unit 411, stress in the panel body when the display panel is curled can be reduced.
Alternatively, on the basis of the above embodiment, with reference to fig. 6, the resistive pressure-sensitive functional layer 41 is disposed in the driving array layer 20. The plurality of data lines 21 in the driving array layer 20 extend along the curling direction X of the display panel, and the resistive pressure sensing unit 411 and the plurality of data lines 21 are arranged along the curling direction X (i.e., the direction Y) perpendicular to the display panel 1; the resistive pressure sensing unit 411 and the data lines 21 are disposed on the same layer, so that the thickness of the display panel can be reduced.
In another embodiment, the resistive pressure sensing unit 411 may also be disposed on the same layer as one or more of VSS, VDD, VGH, VHG, or Verf signal lines.
Wherein, optionally, the driving array layer 20 includes a plurality of conductive layers stacked on one side of the flexible substrate 10, and an insulating layer between adjacent conductive layers. The data line 21 may be formed on a conductive layer. The conductive layer may be a metal layer, and the conductive layer may include at least one of the following materials: aluminum, titanium, and the like. The resistive pressure sensing unit 411 and the plurality of data lines 21 may be located between the same two insulating layers in the driving array layer 20. The data line 21 may be used to transmit a data signal to control the brightness of the light emitting device. The plurality of data lines 21 in the driving array layer 20 are arranged to cross the plurality of scan lines in an insulated manner. The plurality of scan lines may extend in a direction Y and be arranged in a direction X. The direction X, the direction Y and the direction Z may be perpendicular to each other. Alternatively, the display panel 1 may include a display area 101 and a non-display area 102. Optionally, the resistive pressure sensing unit 411 may be located in the non-display area 102 to avoid affecting the arrangement of the data lines.
Optionally, on the basis of the above embodiment, with reference to fig. 5 or fig. 6, the number of the resistive pressure sensing units 411 is one, and the driving array layer 20 is further provided with a first conductive line 22, a second conductive line 23, a third conductive line 24, a high-potential signal transmission line 25, and a low-potential signal transmission line 26.
The first conductive line 22, the second conductive line 23, and the third conductive line 24 are the same as the extending direction of the resistive pressure sensing unit 411. A first end of the first conductive line 22 is electrically connected to a first end of the resistive pressure sensing unit 411; one of the second ends of the first conductive line 22 and the resistive pressure sensing unit 411 is electrically connected to the high potential signal transmission line 25; the other of the second end of the first conductive line 22 and the second end of the resistive pressure sensing unit 411 is electrically connected to the low potential signal transmission line 26. A first end of the first conductive line 22 and a first end of the resistive pressure sensing unit 411 may be electrically connected with a first detection end of the detection module 2.
A first end of the second conductive line 23 is electrically connected to a first end of the third conductive line 24; one of the second ends of the second conductive line 23 and the third conductive line 24 is electrically connected to the high potential signal transmission line 25; the other of the second end of the second conductive line 23 and the second end of the third conductive line 24 is electrically connected to a low potential signal transmission line 26. The first end of the second conductive line 23 and the first end of the third conductive line 24 may be electrically connected with the second detection terminal of the detection module 2. The detection module 2 can be used for detecting a voltage difference between the first detection terminal and the second detection terminal.
The first end of the first conductive line 22, the first end of the second conductive line 23, the first end of the third conductive line 24 and the first end of the resistive pressure sensing unit 411 are located at the first side of the display panel 1; the second end of the first conductive line 22, the second end of the second conductive line 23, the second end of the third conductive line 24, and the second end of the resistive pressure sensing unit 411 are located at the second side of the display panel 1.
Fig. 7 is an equivalent circuit diagram. Referring to fig. 5 and 7, the voltage detected by the detection module 2
Or the like, or, alternatively,
wherein R is22Is a resistance value, R, of first conductive line 2223Is a resistance value, R, of the second conductive line 2324Is a resistance value, R, of the third conductive line 24411V1 is the voltage difference between the high potential signal transmission line 25 and the low potential signal transmission line 26, which is the resistance value of the resistive pressure sensing unit 411. The first, second, and third conductive lines 22, 23, and 24 may be the same material as the data line 21. The first conductive line 22, the second conductive line 23, and the third conductive line 24 may include at least one of the following materials: aluminum oxide, titanium oxide, silicon nitride and the like, so that the deformation amount of the film material is small after the manufactured lead is heated, the change of the resistance value is small, the influence of the thermal effect is small, and at the moment, when the voltages on the first conductive line 22, the second conductive line 23 and the third conductive line 24 are high enough, the manufactured lead becomes a conductor. The first conductive line 22, the second conductive line 23, and the third conductive line 24 may further include at least one of the following materials: aluminum, titanium, and the like. The smaller the development length L of the rollable display panel, that is, the larger the rolled length of the rollable display panel, the larger the resistance R of the resistive pressure sensing unit 411411The larger. R22、R23And R24Does not change with the curl of the rollable display panel. The first conductive line 22, the second conductive line 23, the third conductive line 24, and the resistive pressure sensing unit 411 constitute a strain sensing circuit. In the curling process, the film material of the resistive pressure sensing unit 411 deforms, which results in a resistance value R411By reading the voltage value V2To obtain a change in applied strain. Wherein R is411ρ ═ l/S, ρ is the resistivity of the resistive pressure sensing unit 411, l is the length of the resistive pressure sensing unit 411, and S is the cross-sectional area of the resistive pressure sensing unit 411. The voltage value V can be established in advance through experiments2Corresponding to the developed length L so as to be used in practice according to the detected voltage value V2And a voltage value V2And determining the expansion length L according to the corresponding relation of the expansion length L. Can be made first in advanceResistance value R of conductive line 2222Resistance R of the second conductive line 2323And resistance R of the third conductive line 2424The resistance value of the resistive pressure sensing unit 411 is set to be equal when the display panel is flat, so that the voltage value V is set to be equal20 when the display panel is flat, so that the voltage value V is2The range of the change along with the unfolding length is larger, so that the detection sensitivity is improved. If it is
As the curl length increases, the resistance of the resistive pressure sensing unit 411 increases, and the voltage value V2Can be enlarged by V2Becomes a positive voltage. If it is
As the curl length increases, the resistance of the resistive pressure sensing unit 411 increases, and the voltage value V2Can be reduced, V2Becomes a negative voltage.
If the working voltage range of the detection module is greater than or equal to the preset negative voltage and less than or equal to the preset positive voltage, the resistance R of the first conductive line 22 can be adjusted22Resistance R of the second conductive line 2323And resistance value R of third conductive line 2424The resistance of the resistive pressure sensing unit 411 during the display panel flattening can be smaller than the resistance R of the first conductive line 2222To increase V2The variation range improves the detection sensitivity. Detected voltage V2Resistance value R of first conductive line 22 may be set as desired for voltage difference22Resistance R of the second conductive line 2323And resistance R of the third conductive line 2424And the resistance value of the resistive pressure sensing unit 411 during the flattening of the display panel to increase V2The range of variation to improve the sensitivity of the detection.
If the first conductive line 22, the second conductive line 23, and the third conductive line 24 are not provided, only by inputting a constant current to the resistive pressure sensing unit 411 and detecting the voltage across the resistive pressure sensing unit 411, the unrolling length L of the rollable display panel is determined according to the voltage across the resistive pressure sensing unit 411, at this time, when the display panel is unrolled, the absolute value of the voltage across the resistive pressure sensing unit 411 detected is larger than 0, and as the resistance of the resistive pressure sensing unit 411 increases with the increase of the rolled length, the absolute value of the voltage across the resistive pressure sensing unit 411 continuously increases, and since the maximum value of the operating voltage of the detection module 2 is constant, the detection sensitivity of the scheme without the first conductive line 22, the second conductive line 23, and the third conductive line 24 is lower than the technical scheme corresponding to fig. 5.
Alternatively, on the basis of the above embodiment, fig. 8 is a schematic cross-sectional structure along the direction A1a2 when the rollable display panel provided by the embodiment of the present invention is completely unrolled, and the resistive pressure-sensitive functional layer 41 includes a metal layer 415 and an adhesive layer 416.
Wherein the adhesive layer 416 is located between the flexible substrate 10 and the metal layer 415. Optionally, the metal layer 415 includes a nano metal layer or a micro metal layer to ensure that the metal layer is soft enough to be deformed during the curling process of the display panel. The metal layer 415 may be formed by an evaporation process. When the display panel is rolled, the rolled portion of the metal layer 415 is deformed by the stress of the rolling, and the sectional area is reduced, and the length is increased, thereby increasing the resistance value. Optionally, the metal layer 415 comprises at least one of the following materials: aluminum, steel, iron, and tin. Since the metal layer 415 made of the metal layer has a large amount of deformation when it is curled with respect to the first conductive line 22, the second conductive line 23, and the third conductive line 24, the degree of curling of the panel can be detected from a change in the resistance value and/or the capacitance value.
Alternatively, the thickness (in the thickness direction Z of the display panel) of the metal layer 415 may be greater than or equal to 2 micrometers and less than or equal to 100 micrometers. Optionally, the width of the metal layer 415 may be greater than or equal to 2 microns, less than or equal to 100 microns.
Alternatively, the adhesive layer 416 may be a glue of type M-bond200, M-bond600, M-bond610, etc. The adhesive layer 416 is thin, and may be, for example, 1 micron.
Alternatively, on the basis of the foregoing embodiment, fig. 9 is a schematic partial cross-sectional structure diagram of a rollable display panel according to an embodiment of the present invention, where the light emitting device layer 30 includes an anode layer 31, a light emitting functional layer 32, and a cathode layer 33, which are sequentially stacked.
The light emitting function layer 32 may include an electron injection layer, an electron transport layer, a hole blocking layer, a light emitting layer, an electron blocking layer, a hole transport layer, a hole injection layer, and the like. Optionally, the rollable display panel may further include an encapsulation layer on the side of the light emitting device layer 30 away from the flexible substrate 10. The encapsulation layer may be a thin film encapsulation layer, and the thin film encapsulation layer may include at least one organic layer and at least one inorganic layer alternately stacked in a thickness direction of the display panel. The packaging layer can prevent external water and oxygen from invading, so that the luminescent material is oxidized and loses efficacy.
Alternatively, on the basis of the above embodiment, fig. 10 is a schematic cross-sectional structure view along the direction A1a2 when the rollable display panel provided in the embodiment of the present invention is completely unfolded, and the capacitive pressure sensitive functional layer 42 includes a first electrode layer 421, an elastic insulating medium layer 422, and a second electrode layer 423 that are sequentially stacked along the thickness direction Z of the display panel 1.
The elastic insulating medium layer 422 may include: polydimethylsiloxane, polyurethane elastomer, silicone rubber, or the like. When the display panel is curled, the curled portion of the elastic insulating medium layer 422 is deformed by the curling stress, so that the thickness is reduced, the length is lengthened, that is, the distance between the two electrodes of the equivalent capacitor is reduced, the facing area is increased, and the capacitance value is increased. The first electrode layer 421 and the second electrode layer 423 may be a nano metal layer or a micro metal layer. The capacitive pressure sensitive functional layer 42 may be located in a non-display area of the display panel. The first electrode layer 421, the elastic insulating medium layer 422, and the second electrode layer 423 may extend in parallel to the curling direction X of the display panel 1, extending from the first side to the second side of the display panel.
Alternatively, on the basis of the above embodiment, with continuing reference to fig. 10, the plurality of conductive layers in the driving array layer 20 may include the gate layer 273 and the source and drain layers 274 of the thin film transistor 27, and the like. The upper plate layer of the storage capacitor 29 and the thin film transistor 27 may be disposed at the same layer. The lower plate layer of the storage capacitor 29 and the gate layer 273 of the tft 27 may be disposed in the same layer. The insulating layer may include a gate insulating layer 272 between the active layer 271 and the gate layer 273 of the thin film transistor 27, an interlayer insulating layer 275 between the gate layer 273 and the source-drain layer 274 of the thin film transistor 27, and the like. The drain of thin film transistor 29 may be electrically connected to anode layer 31 through a via that extends through planarization layer 201. The display panel may further include a pixel defining layer 202, the pixel defining layer 202 is provided with a plurality of pixel openings, and the light emitting function layer 32 may be located in the pixel openings. The data line may be disposed in the same layer as the source and drain layers 274 of the thin film transistor 27. The scan line may be disposed in the same layer as the gate layer 273 of the thin film transistor 27.
The embodiment of the invention provides a rollable display device. With continued reference to fig. 5 or 6 on the basis of the above-described embodiment, the rollable display device includes: a detection module 2, a processing module 3 and a rollable display panel 1 according to any of the embodiments of the present invention.
The detection module 2 is electrically connected with the pressure-sensitive functional layer 40 and the processing module 3; the processing module 3 is used for determining the expansion length L of the display panel 1 according to the detection value of the detection module 2.
The detection module 2 may be a voltage detection module or a current detection module. The detection end of the detection module 2 may be electrically connected to the pressure-sensitive functional layer 40. The output of the detection module 2 may be electrically connected to the processing module 3. The detection module 2 may include a signal amplification circuit for amplifying the detection signal to improve detection sensitivity. The processing module 3 may comprise at least one of: a Micro Controller Unit (MCU), a digital signal processor (digital signal processing), and the like. The rollable display device may further include a timing control chip, the processing module 3 may be electrically connected with the timing control chip, and the timing control chip may be electrically connected with the data line through the data driving circuit; the time sequence control chip can be electrically connected with the scanning line through the scanning driving circuit; the time sequence control chip can be electrically connected with the light-emitting control line through the light-emitting control circuit. The time sequence control chip is used for controlling the light emitting devices in the unfolding area to emit light according to the unfolding length L.
The rollable display device provided by the embodiment of the invention includes the rollable display panel in the above embodiment, and therefore, the rollable display device provided by the embodiment of the invention also has the beneficial effects described in the above embodiment, and further description is omitted here.
Optionally, on the basis of the foregoing embodiment, with continuing reference to fig. 5 or fig. 6, when the driving array layer 20 is further provided with a first conductive line 22, a second conductive line 23, a third conductive line 24, a high-potential signal transmission line 25, and a low-potential signal transmission line 26, the detection module 2 includes a differential amplification circuit, a first input end of the differential amplification circuit is electrically connected to a first end of the resistive pressure sensing unit 411; a second input terminal of the differential amplification circuit is electrically connected to a first terminal of a second electrically conductive line 23; the output end of the differential amplifying circuit is electrically connected with the processing module 3. The differential amplifying circuit can be used for amplifying the detection signal to improve the detection sensitivity, and each segment of the display panel which is curled to a smaller length can be detected, so that the situation that the change rate of the resistance value of the resistance type pressure sensing unit 411 is smaller and the change rate of the voltage value is smaller when the display panel is curled is avoided. Optionally, the first input terminal of the differential amplifying circuit may be a non-inverting input terminal, and the second input terminal may be an inverting input terminal; alternatively, the first input terminal of the differential amplification circuit may be an inverting input terminal, and the second input terminal may be a non-inverting input terminal.
Optionally, on the basis of the above embodiment, fig. 11 is a schematic structural diagram of a rollable display device according to an embodiment of the present invention, and the rollable display device may further include a receiving portion 4 and a reel 5. The display panel can be accommodated in the accommodation portion 4. The reel 5 may be located within the receptacle 4. The display panel may be wound on a reel 5.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious modifications, rearrangements, combinations and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A rollable display panel, comprising:
a flexible substrate;
a driving array layer located at one side of the flexible substrate;
the light-emitting device layer is positioned on one side, far away from the flexible substrate, of the driving array layer;
a pressure sensitive functional layer between the flexible substrate and the light emitting device layer, the pressure sensitive functional layer extending from a first side to a second side of the display panel, the first and second sides of the display panel being arranged along a curling direction of the display panel, the pressure sensitive functional layer comprising at least one of: the capacitive pressure-sensitive display panel comprises a resistance pressure-sensitive functional layer and a capacitance pressure-sensitive functional layer, wherein the resistance value and/or the capacitance value of the pressure-sensitive functional layer are/is changed along with the curling length of the display panel.
2. The rollable display panel according to claim 1, wherein the resistive pressure sensitive functional layer comprises at least one resistive pressure sensitive unit in a shape of a strip extending from a first side to a second side of the display panel.
3. The rollable display panel of claim 2, wherein the resistive pressure sensing functional layer is disposed in the driving array layer, and the resistive pressure sensing unit extends in a rolling direction of the display panel;
the plurality of data lines in the driving array layer extend along the curling direction of the display panel, and the resistive pressure sensing units and the plurality of data lines are arranged along the curling direction which is perpendicular to the display panel;
the resistance type pressure sensing unit and the data lines are arranged on the same layer.
4. The rollable display panel according to claim 2, wherein the resistive pressure sensing unit is provided with a plurality of through holes arranged in a rolling direction of the display panel, the through holes extending in a thickness direction of the display panel.
5. The rollable display panel according to claim 2, wherein a plurality of protrusions are disposed on two sides of the resistive pressure sensing unit, the protrusions located on the same side of the resistive pressure sensing unit are arranged along an extending direction of the resistive pressure sensing unit, and the arrangement direction of the two sides of the resistive pressure sensing unit on which the protrusions are disposed is perpendicular to a thickness direction of the display panel.
6. The rollable display panel according to claim 2, wherein the number of the resistive pressure sensing units is one, the driving array layer is further provided with a first conductive line, a second conductive line, a third conductive line, a high-potential signal transmission line and a low-potential signal transmission line, the first conductive line, the second conductive line and the third conductive line extend in the same direction as the resistive pressure sensing units, a first end of the first conductive line is electrically connected to the first end of the resistive pressure sensing unit, and one of a second end of the first conductive line and a second end of the resistive pressure sensing unit is electrically connected to the high-potential signal transmission line; the other of the second end of the first conductive wire and the second end of the resistive pressure sensing unit is electrically connected with the low-potential signal transmission line;
one of a first end of the second conductive line and a second end of the third conductive line is electrically connected to the high potential signal transmission line; the other of the second end of the second conductive line and the second end of the third conductive line is electrically connected to the low potential signal transmission line;
the first end of the first conductive wire, the first end of the second conductive wire, the first end of the third conductive wire and the first end of the resistance type pressure sensing unit are positioned on the first side of the display panel; the second end of the first conductive wire, the second end of the second conductive wire, the second end of the third conductive wire and the second end of the resistive pressure sensing unit are located at the second side of the display panel.
7. The rollable display panel of claim 1 wherein the resistive pressure sensitive functional layer comprises a metal layer and an adhesive layer,
wherein the adhesive layer is located between the flexible substrate and the metal layer, and the metal layer comprises a nano metal layer or a micro metal layer.
8. The rollable display panel of claim 7, wherein the metal layer comprises at least one of the following materials: aluminum, steel, iron, and tin.
9. A rollable display device, comprising: a detection module, a processing module and the rollable display panel according to any one of claims 1 to 8, the detection module being electrically connected with the pressure sensitive functional layer and the processing module; the processing module is used for determining the expansion length of the display panel according to the detection value of the detection module.
10. The rollable display device according to claim 9, wherein when the driving array layer is further provided with a first conductive line, a second conductive line, a third conductive line, a high potential signal transmission line, and a low potential signal transmission line, the detection module includes a differential amplification circuit, a first input terminal of the differential amplification circuit is electrically connected to the first terminal of the resistive pressure sensing unit; a second input terminal of the differential amplification circuit is electrically connected with a first terminal of the second conductive line; and the output end of the differential amplification circuit is electrically connected with the processing module.
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