WO2019206092A1 - 柔性显示面板及柔性显示装置 - Google Patents

柔性显示面板及柔性显示装置 Download PDF

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Publication number
WO2019206092A1
WO2019206092A1 PCT/CN2019/083718 CN2019083718W WO2019206092A1 WO 2019206092 A1 WO2019206092 A1 WO 2019206092A1 CN 2019083718 W CN2019083718 W CN 2019083718W WO 2019206092 A1 WO2019206092 A1 WO 2019206092A1
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WIPO (PCT)
Prior art keywords
flexible display
hollow portion
display panel
insulating layer
lead
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2019/083718
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English (en)
French (fr)
Chinese (zh)
Inventor
马永达
郝学光
乔勇
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BOE Technology Group Co Ltd
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BOE Technology Group Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BOE Technology Group Co Ltd filed Critical BOE Technology Group Co Ltd
Priority to US16/616,272 priority Critical patent/US11119538B2/en
Priority to JP2019570372A priority patent/JP7289269B2/ja
Priority to KR1020197037311A priority patent/KR102337079B1/ko
Publication of WO2019206092A1 publication Critical patent/WO2019206092A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/16—Constructional details or arrangements
    • G06F1/1613—Constructional details or arrangements for portable computers
    • G06F1/1633—Constructional details or arrangements of portable computers not specific to the type of enclosures covered by groups G06F1/1615 - G06F1/1626
    • G06F1/1637—Details related to the display arrangement, including those related to the mounting of the display in the housing
    • G06F1/1652—Details related to the display arrangement, including those related to the mounting of the display in the housing the display being flexible, e.g. mimicking a sheet of paper, or rollable
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1345—Conductors connecting electrodes to cell terminals
    • G02F1/13458—Terminal pads
    • 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
    • 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
    • G09G3/36—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 liquid crystals
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10—OLED displays
    • H10K59/12—Active-matrix OLED [AMOLED] displays
    • H10K59/131—Interconnections, e.g. wiring lines or terminals
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K2102/00—Constructional details relating to the organic devices covered by this subclass
    • H10K2102/301—Details of OLEDs
    • H10K2102/311—Flexible OLED

Definitions

  • Embodiments of the present disclosure relate to a flexible display panel and a flexible display device.
  • the flexible display panel realizes the bendability of the flexible display panel by forming the display unit on the flexible carrier, thereby improving the user's operating experience and expanding the application scenario of the display panel.
  • the flexible display panel is provided with a plurality of leads for transmitting signals, when the extending direction of the leads passes through a region where the flexible display panel is bent during use or production, the separation force generated by the bending acts, the lead and the upper layer
  • the insulating layer and the lower insulating layer are easily separated at a section located in the bent region, resulting in poor separation of the conductive layer (ie, the lead) from the insulating layer, which affects product performance.
  • An embodiment of the present disclosure provides a flexible display panel, including:
  • At least one of the leads is provided with at least one first hollow portion in the predetermined bending region, and the first insulating layer and the second insulating layer are connected by the at least one first hollow portion .
  • the same strip is provided with a plurality of first hollow portions in the predetermined bending region, each of the first hollow portions having a first opening facing the first insulating layer;
  • an area of the first opening of the first hollow portion closer to the bending edge is larger than the first hollow portion farther from the bending edge
  • An area of the first opening of the portion, and an area of the first opening of the first hollow portion near a bending center is smaller than the first portion of the first hollow portion farther from the bending center The area of the opening.
  • the same strip is provided with a plurality of first hollow portions in the predetermined bending region.
  • a distribution density of the first hollow portion in a sub-region closer to the bending edge is greater than the sub-region in a sub-region farther from the bending edge
  • the distribution density of the first hollow portion, and the distribution density of the first hollow portion in the sub-region closer to the bending center is smaller than the distribution density of the first hollow portion in the sub-region farther from the bending center.
  • the lead has a bottom surface in contact with the first insulating layer
  • the first hollow portion has a first angle between the boundary of the cross section perpendicular to the surface of the flexible display panel and the bottom surface, and the first angle is 45° to 95°.
  • At least one of the leads further includes a first portion between the predetermined bend region and an edge of the flexible display panel, at least one second hollow portion being located in the first portion of the at least one lead The first insulating layer and the second insulating layer are also connected by the at least one second hollow portion.
  • an angle between a cross-sectional boundary of the second hollow portion and the bottom surface is a second angle, and the second angle is smaller than the first Angle.
  • the predetermined bending region is located between the display area of the flexible display panel and the edge of the flexible display panel;
  • the at least one lead wire further includes a second portion between the display area and the predetermined bending area, for connecting the signal line;
  • a third hollow portion is located in the second portion of the at least one lead, and the first insulating layer and the second insulating layer are further connected by the third hollow portion.
  • the angle between the cross-sectional boundary of the third hollow portion and the bottom surface is a third angle, and the third angle is smaller than the first clip. angle.
  • the same strip is provided with a plurality of first hollow portions in the predetermined bending region, each of the first hollow portions having a first opening facing the first insulating layer;
  • an area of the first opening of the first hollow portion on a portion having a wider line width on a portion of the lead wire is larger than a portion having a narrower line width An area of the first opening of the first hollow portion.
  • each of the lead wires is disposed in the predetermined bending region with a plurality of the first hollow portions arranged along the extending direction of the lead wires;
  • the distribution density of the first hollow portions on each of the leads decreases as the length of the leads increases.
  • the plurality of first hollow portions on each of the leads are substantially equal in volume.
  • each of the lead wires is disposed in the predetermined bending region with a plurality of the first hollow portions arranged along the extending direction of the lead wires;
  • the total hollow volume of the first hollow portion on each of the leads decreases as the length of the lead increases.
  • the first hollow portion is a through hole; a minimum line width of the lead wire is larger than 4/3 of a maximum aperture of the through hole away from an upper hole of the first insulating layer, and is smaller than the upper hole 3 times the maximum aperture.
  • Another embodiment of the present disclosure provides a flexible display device comprising the flexible display panel of any of the above.
  • FIG. 1 is a schematic top plan view of a flexible display panel according to an embodiment of the present disclosure
  • Figure 2 is a schematic cross-sectional view taken along line A-A' of Figure 1;
  • FIG. 3 is a schematic top plan view of a flexible display panel according to an embodiment of the present disclosure.
  • FIG. 4 is a schematic top plan view of a flexible display panel according to an embodiment of the present disclosure.
  • FIG. 5 is a cross-sectional view showing a cross-sectional structure of a first hollow portion and a second hollow portion in a flexible display panel according to an embodiment of the present disclosure
  • FIG. 6 is a cross-sectional view showing a cross-sectional structure of a first hollow portion and a third hollow portion in a flexible display panel according to an embodiment of the present disclosure
  • FIG. 7 is an enlarged schematic partial plan view showing a flexible display panel according to an embodiment of the present disclosure.
  • FIG. 8 is an enlarged schematic partial plan view showing a flexible display panel according to an embodiment of the present disclosure.
  • FIG. 9 is an enlarged schematic partial plan view showing a flexible display panel according to an embodiment of the present disclosure.
  • FIG. 10 is a schematic diagram of a flexible display device according to an embodiment of the present disclosure.
  • first, second and similar terms used in the description and claims of the present disclosure are not intended to represent any order, quantity, or importance, and are merely used to distinguish different components.
  • the word “comprising” or “comprises” or the like means that the element or item preceding the word is intended to be in the
  • the terms “upper/upper”, “lower/lower”, and the like of the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of explanation of the technical solution of the embodiments of the present disclosure. It is not intended to be a limitation or limitation of the invention.
  • the embodiments of the present disclosure provide a flexible display panel and a flexible display device, which can solve the problem that the lead wires passing through the preset bending region in the flexible display panel are separated from the insulating layer when the panel is bent, and the product performance is improved.
  • an embodiment of the present disclosure provides a flexible display panel 100 including: a first insulating layer 1 (not illustrated in FIG. 1 ); and a plurality of leads disposed on the first insulating layer 1 2, the extending direction of the lead 2 passes through the predetermined bending area S1 of the flexible display panel 100; the second insulating layer 3 (not shown in FIG. 1) disposed on each of the leads 2; wherein the lead 2 is located in the pre- A first hollow portion 21 is provided in the bent region S1, and the first insulating layer 1 and the second insulating layer 3 are connected by the first hollow portion 21.
  • the flexible display panel has a display area for displaying a screen, and a plurality of signal lines are disposed in the area, and the lead wires are in one-to-one correspondence with the signal lines, thereby providing corresponding signals for the signal lines.
  • the signal line in the display area S0 can be divided into a plurality of data lines 4 and a plurality of gate lines 5 with an insulating layer interposed therebetween.
  • the intersection of the data line and the gate line defines a pixel area, the data line provides a display signal for the pixel area, and the gate line provides a scan switching electric field.
  • the lead may be, for example, a data line lead.
  • the data line lead may be formed by using a metal material when the data line is prepared. Further, the data line and the data line lead may be integrally formed, that is, simultaneously formed by the same patterning process.
  • the lead may be, for example, a gate line lead.
  • the gate line lead may be formed by using a metal material when the gate line is prepared. Further, the gate line and the gate line lead may be integrally formed, that is, simultaneously formed by the same patterning process.
  • an insulating layer is disposed above and below the data line layer, and the first insulating layer 1 and the second insulating layer are provided above and below the lead wire for the same layer (ie, data line lead) connected to the data line.
  • Layer 3 may be a portion of the upper and lower insulating layers of the data line layer that extends beyond the display area of the flexible display panel.
  • an insulating layer is disposed above and below the gate line layer, and for the leads (ie, gate lines) disposed in the same layer as the gate lines, the first insulating layer 1 above and below the leads
  • the second insulating layer 3 may be a portion in which the insulating layer above and below the gate line layer extends beyond the display region of the flexible display panel.
  • first insulating layer 1 and the second insulating layer 3 above and below the lead 2 are not limited in the embodiment of the present disclosure, and only the lead 2 is disposed on the first insulating layer 1, that is, the lead 2 is provided with a lining.
  • the second insulating layer 3 is disposed on the lead 2, and is connected to the opposite lower first insulating layer 1 through the first hollow portion 21 on the lead 2.
  • the first hollow portion 21 described above refers to a through structure formed on the lead 2 for the through lead 2 so that the lead 2 is formed after the lead 2 is formed and the second insulating layer 3 has not been formed.
  • the first hollow portion 21 can expose the underlying first insulating layer 1 so that the second insulating layer 3 formed after the lead 2 can pass through the first hollow portion 21 and the first insulating layer below after covering the lead 2 Layer 1 is connected.
  • the distribution density of the first hollow portion 21 on each lead 2 (that is, the number of the first hollow portions 21 within a certain length) and the shape are not specifically limited, and can be flexibly adjusted according to further design requirements.
  • leads 2 in the above flexible display panel 100 are illustrated in FIG. 1 described above.
  • the specific number of the lead wires 2 can be flexibly adjusted according to the specific dimensions of the flexible display panel 100 and the pixel density, and the embodiment of the present disclosure does not limit this.
  • each lead corresponds to a conductive layer, and the material composition thereof is structurally significantly different from the insulating layer, and therefore, the molecular bonding force between the lead and the insulating layer Less than the molecular binding force between the insulating layers. In this way, when the flexible display panel is flexibly bent, the contact surface between the lead wire and the insulating layer located in the bending region is likely to be separated due to the small molecular bonding force.
  • the first hollow portion 21 is formed on the portion where the lead wire 2 is located in the predetermined bending region, so that the first insulating layer respectively located below and above the lead wire 2 is formed. 1 is connected to the second insulating layer 3, that is, a certain interface transition region is formed between the lead and the insulating layer, and the bonding force between the first insulating layer 1 and the second insulating layer 3 is stronger, and the attachment is increased. Efforts can be made to reduce or avoid the possibility of separation of the lead 2 and the upper and lower insulating layers in contact with each other during bending, especially repeated bending, and improve product yield.
  • the shape of the first hollow portion 21 includes, but is not limited to, a circular hole shape as shown in FIG. 1, so that each of the lead wires 2 does not have a completely broken region, thereby ensuring each lead wire. 2 can transmit signals normally.
  • the preparation is limited.
  • the hole width i.e., the aperture
  • the upper hole refers to, for example, a hole formed in the through hole 21 on the surface of the lead 2 remote from the first insulating layer 1.
  • embodiments of the present disclosure further provide an embodiment in which the minimum line width of the lead 2 is, for example, greater than 4/3 of the maximum aperture of the through hole away from the upper hole of the first insulating layer 1, and smaller than the maximum aperture of the upper hole. 3 times.
  • the minimum line width of the lead 2 refers to the minimum distance d between the two outer boundaries, see FIG. In Figure 1, each lead 2 has a substantially uniform width.
  • the maximum aperture refers to the widest aperture of the upper aperture of the through hole.
  • the maximum aperture is the long axis width of the ellipse; when the upper hole pattern is circular, the maximum aperture is the diameter of the circle.
  • the first hollow portion 21 has a first opening 21a facing the first insulating layer 1, and a portion of the first insulating layer 1 exposed by the first opening 21a is connected to the second insulating layer 3. section.
  • an embodiment of the present disclosure further provides another embodiment in which at least one lead 2 is provided with a plurality of first intervals arranged along the extending direction of the lead 2 in the predetermined bending region S1 described above.
  • the hollow portion 21 can adjust different degrees of bending by the specific distribution of the first openings 21a of the different first hollow portions 21 on the same strip lead 2 and/or the first hollow portions 21 on the same lead 2 The separation force of the lead and the insulating layer produced by the folding.
  • the extending direction of the lead 2 is, for example, the longitudinal direction in which the largest dimension of the lead is located.
  • the area of the first opening 21a of the first hollow portion 21 located in the sub-region near the bending edge is larger than the first hollow portion 21 located in the sub-region near the center of the bending.
  • the area of the first opening 21a is shown by broken lines, and are both parallel to the edge of the display region S0 facing the preset bending region S1.
  • the flexible display panel 100 when the flexible display panel 100 is bent, for a sub-region near the bent edge in the predetermined bending region S1, since the sub-region is located at a boundary where the panel is bent and does not bend, There is a case where the stress distribution is uneven inside, and the lead 2 is more likely to be separated from the upper and lower insulating layers which are in contact with each other.
  • the lead 2 may be separated from the upper and lower insulating layers in contact with each other to a lesser extent.
  • the above-described embodiment provided by the embodiment of the present disclosure further provides the first hollow portion 21 in which the first opening 21a is larger in a sub-region near the bent edge (ie, the region where the stress distribution is more unevenly generated by the bending).
  • the first insulating layer 1 on the upper and lower sides of the lead 2 and the second insulating layer 3 may be connected to each other in a sub-region where the predetermined bending degree is large, thereby further improving the adhesion.
  • an area of the first opening of the first hollow portion closer to the bending edge is larger than the first portion farther from the bending edge
  • An area of the first opening of a hollow portion, and an area of the first opening of the first hollow portion near a bending center is smaller than the area of the first hollow portion farther from the bending center The area of the first opening.
  • the distribution density of the first hollow portion 21 located in the sub-region near the bending edge may be set to be larger than the first hollow in the sub-region near the bending center.
  • the distribution density of the portion 21 For example, in the predetermined bending region, among the same of the leads, a distribution density of the first hollow portion in a sub-region closer to the bending edge is greater than a sub-region in a sub-region farther from the bending edge a distribution density of the first hollow portion, and a distribution density of the first hollow portion in a sub-region closer to a bending center is smaller than a distribution of the first hollow portion in a sub-region farther from the bending center density.
  • the first insulation on the upper and lower sides of the lead 2 can be made by designing more first hollow portions 21 in the sub-regions near the bent edges (ie, the regions where the stress distribution is more unevenly distributed).
  • the layer 1 and the second insulating layer 3 are connected by more first hollow portions 21 in a sub-region having a predetermined degree of curvature, thereby further improving the adhesion.
  • the embodiment of the present disclosure further provides a further embodiment.
  • the lead 21 has a bottom surface 21b in contact with the first insulating layer 1.
  • the first hollow portion 21 is perpendicular to the flexible portion.
  • the angle between the boundary of the cross section of the surface of the display panel 100 and the bottom surface 21b is a first angle (labeled as ⁇ 1 in FIG. 2), and the range of the first angle is, for example, 45° to 95°.
  • the first angle is selected within the above range (the range includes 45° and 95°), and the portion of the second insulating layer 3 that is in contact with the lead 2 in the first hollow portion 21 due to the angle being too small can be avoided.
  • There is a long contact boundary so that the possibility of separation of the second insulating layer 3 and the lead 21 at the longer cross-sectional boundary when bending is increased; at the same time, it is also possible to avoid the first hollow portion 21 due to excessive angle.
  • the difference in the upper and lower opening areas is too large to increase the difficulty in preparation of the first hollow portion 21.
  • At least one lead 2 is located outside the preset bending area S1, and a portion close to the edge of the flexible display panel is further provided with a second hollow portion 22, the first insulating layer 1 and The second insulating layer 3 is also connected by the second hollow portion 22.
  • the portion of the lead 2 near the edge of the flexible display panel is usually a portion connected to a connection terminal (or a signal extraction terminal) on the control circuit, and the possibility of bending at the connection terminal is low, at the distance of the lead 2
  • the second hollow portion 22 is provided in a region where the connection terminal is closer to disperse the stress generated inside the lead 2 when it is bent.
  • the angle between the cross-sectional boundary of the second hollow portion 22 and the bottom surface 21b is a second angle (labeled as ⁇ 2 in FIG. 5).
  • the second angle ⁇ 2 is smaller than the first angle ⁇ 1 of the first hollow portion 21, so that the cross-sectional boundary of the second hollow portion 22 on the region of the lead 2 closer to the connection terminal is longer, further dispersed.
  • the area of the opening of the second hollow portion 22 on the surface of the lead 2 away from the first insulating layer may be designed to be larger than the first hollow portion 21 .
  • the area of the opening on the surface of the lead 2 remote from the first insulating layer may be designed to be larger than the first hollow portion 21 .
  • the area of the opening on the surface of the lead 2 remote from the first insulating layer may be designed to be larger than the first hollow portion 21 .
  • the preset bending area S1 is located between the display area S0 of the flexible display panel and the edge of the flexible display panel; and a plurality of signal lines are disposed in the display area (the signal line is shown in FIG. 4)
  • the data line is labeled as 4 for example; the lead 2 is located between the display area S0 and the edge of the flexible display panel for connecting the signal line 4; at least one lead is located outside the preset bending area S1, and is close to
  • a third hollow portion 23 is further provided on a portion of the display region S0, and the first insulating layer 1 and the second insulating layer 3 are also connected by the third hollow portion 23.
  • the possibility that the lead 2 is bent near the display area S0 is low, and the third hollow portion 23 is provided in a region where the lead 2 is closer to the display region S0, which can be generated inside the entire lead when the lead 2 is bent. stress.
  • the angle between the cross-sectional boundary of the third hollow portion 23 and the bottom surface is a third angle (labeled as ⁇ 3 in FIG. 6).
  • the third included angle ⁇ 3 is smaller than the first included angle ⁇ 1 of the first hollow portion 21, so that the cross-sectional boundary of the third hollow portion 23 on the region where the lead wire 2 is closer to the display region S0 is longer, further Dispersing the stress generated in the entire insulating layer when the first insulating layer 1 and the second insulating layer 3 are bent.
  • the first hollow portion 21 and the third hollow portion 23 are used as the through holes.
  • the area of the opening of the third hollow portion 23 on the surface of the lead 2 away from the first insulating layer may be larger than the first hollow portion 21 .
  • the second hollow portion 22 located outside the predetermined bending region S1 and close to the edge of the flexible display panel, and the third hollow portion 23 located outside the predetermined bending region S1 and close to the display region S0 It has a certain transitional effect and disperses the stress generated in the lead 2 due to the occurrence of bending.
  • the first opening of the first hollow portion 21 on the portion having the wider line width on the lead wire is larger than the first portion on the portion having the narrower line width.
  • the first opening is an opening of the first hollow portion 21 toward the first insulating layer.
  • the first opening may mean an opening formed by the first hollow portion 21 on the surface of the lead 2 facing the first insulating layer.
  • the contact area between the lead 2 and the insulating layer becomes large as the line width is widened, the separation of the lead 2 and the insulating layer is more likely to occur at the time of bending, and therefore, the first hollow on the portion where the line width is widened
  • the first opening of the portion 21 is larger, that is, the insulating layer above and below the lead 2 is connected more, further reducing the probability of separation of the lead from the insulating layer.
  • an example of a portion where the line width is widened may be a plurality of positions where the wires with the hollow are arranged side by side.
  • the through hole on the portion where the line width is widened has a larger aperture.
  • the lead wire is led out from the display area and extends to one side edge of the flexible display panel and is connected to the connection terminal to transmit the corresponding signal to the signal line (such as the data line and the gate line) in the display area.
  • the width of the display area in the flexible display panel is generally greater than the width of one side edge adjacent to the connection terminal, that is, there is a tightening area from the display area to the side edge.
  • the number of leads drawn from the display area is correspondingly larger, resulting in a lead located at a central position between the display area and the side edge of the connection terminal from the display area to the connection terminal.
  • the distance traveled between them is shorter (ie, the lead is shorter), and the lead at the edge position extending from the center to both sides travels longer from the display area to the connection terminal (ie, the lead is longer), thereby
  • the plurality of leads exhibit a gradual increase in length from the center to the edge.
  • the trace resistance R has the following expression:
  • ⁇ is the resistivity
  • L is the trace length
  • S is the cross-sectional area of the trace
  • d is the trace thickness
  • w is the trace width
  • each lead is usually formed by the same patterning process, the resistivity ⁇ is the same, and the thickness d is the same; and, because of the large number of leads, the line widths W of the respective leads are generally the same or very close.
  • a serpentine bending structure such as a fold line having a different length is designed on the lead wires at different positions so that the lengths of the traces at the respective positions are the same or approximately the same, so as to solve the problem that the lead resistances at different positions are inconsistent.
  • the inventors have further found in the research that for a flexible display panel with a high-definition display, since the resolution of the display screen is larger, the number of pixel units per unit area is also larger, and the number of corresponding signal lines and leads is also Further, there is less wiring space around the display area, and it is impossible to compensate for the problem of poor resistance uniformity due to inconsistent lead lengths at different positions by preparing a complicated serpentine trace structure outside the display area.
  • embodiments of the present disclosure are to further solve or improve the problem of poor resistance uniformity caused by inconsistent lead lengths at different positions, which can be adjusted at least by the number and size of the first hollow portions 21 on different leads 2
  • the resistance difference of lead wires 2 of different lengths includes the following two adjustment methods:
  • each of the lead wires 2 is provided with a plurality of first hollow portions 21 arranged in the extending direction of the lead wires 2 in the predetermined bending region S1; the length of each of the lead wires 2 is from the center to the edge (pointing The direction is gradually increased as indicated by the arrow in Fig. 8, and the distribution density (i.e., the number) of the first hollow portions 21 on the respective lead wires 2 gradually decreases as the length of the lead wires 2 increases.
  • the volumes of the plurality of the first hollow portions on the respective lead wires are substantially equal
  • Providing the first hollow portion 21 on the lead wire corresponds to reducing the line width of the lead wire at the position where the first hollow portion 21 is provided, and the resistance is increased.
  • the shorter the lead length the more the first hollow portion 21 is distributed thereon; conversely, the longer the lead length, the less the first hollow portion 21 is distributed thereon, thereby adjusting the difference by the distribution density of the first hollow portion 21.
  • the resistance value of the lead 2 is the resistance value of the lead 2.
  • the specific degree of the distribution density of the first hollow portion 21 on the lead wire gradually decreases with the increase of the length of the lead wire 2 can be obtained by corresponding calculation, which is not limited in the present disclosure.
  • a second hollow portion 22 may be disposed on a portion of the lead wire 2 which is closer to the connecting terminal, and a third hollow portion 23 may be further disposed on a portion close to the display region, and the second hollow portion is provided. 22.
  • the third hollow portion 23 may further be arranged in such a manner that the distribution density gradually decreases as the length of the lead 2 increases.
  • each of the lead wires 2 is provided with a plurality of first hollow portions 21 arranged in the extending direction of the lead wires 2 in the predetermined bending region S1; the length of each of the lead wires 2 is from the center to the edge (pointing The direction is gradually increased as indicated by an arrow in Fig. 9, and the total hollow volume of the first hollow portion 21 on each lead 2 gradually decreases as the length of the lead 2 increases.
  • the volume of the first hollow portion 21, that is, the size of the lead 2 which is hollowed out, is formed by the same preparation process, and the thickness is the same or very close, and the volume of the first hollow portion 21 actually depends on The opening size of the first hollow portion 21.
  • the shorter the lead length the larger the total hollow volume of the first hollow portion 21 distributed thereon; conversely, the longer the lead length, the smaller the total hollow volume of the first hollow portion 21 distributed thereon, thereby passing the first hollow
  • the size of the portion 21 is used to adjust the resistance values of the different leads 2.
  • the second hollow portion 22 may be disposed on a portion of the lead wire 2 which is closer to the connecting terminal, and the third hollow portion 23 may be further disposed on a portion close to the display region, and the second hollow portion 22.
  • the third hollow portion 23 may further be set in such a manner that the size gradually decreases as the length of the lead 2 increases.
  • the flexible display panel provided by the embodiment of the present disclosure can further solve the problem of separating the lead and the insulating layer due to the absence of the interface transition region between the lead wire and the insulating layer when the bending is solved, and further adjusting the different lead wires.
  • the size and size of the first hollow portion can improve the problem of inconsistent lead resistance of different lengths, further satisfying the display requirements of high definition display products.
  • the embodiment of the present disclosure further provides a method for preparing a flexible display panel, the preparation method comprising:
  • Step S1 forming a first insulating layer
  • Step S2 forming a plurality of leads on the first insulating layer, the extending direction of the leads passing through the predetermined bending region of the flexible display panel; the lead is formed with the first hollow exposed in the first insulating layer in the predetermined bending region unit;
  • Step S3 forming a second insulating layer; wherein the second insulating layer and the first insulating layer are connected by the first hollow portion.
  • a first hollow portion exposing the first insulating layer is formed on the leads by a patterning process.
  • a typical patterning process refers to applying a mask to expose a photoresist by exposing (photo), developing, etching (Etch, such as dry etching) a photoresist on the surface of the film. Part of the process of forming a specific pattern and removing the photoresist.
  • the structure of the first hollow portion may be a through hole.
  • the formed first hollow portion has a first opening facing the first insulating layer; and in the predetermined bending region, the first hollow is located in a sub-region with a predetermined degree of curvature The first opening of the portion is larger than the first opening of the first hollow portion in the sub-region having a small predetermined degree of curvature.
  • the distribution density of the first hollow portion in the sub-region with a predetermined degree of curvature is greater than that in the sub-region with a small preset curvature The distribution density of the first hollow.
  • the formed lead has a bottom surface in contact with the first insulating layer; in a vertical direction of the flexible display panel, an angle between a cross-sectional boundary of the first hollow portion and the bottom surface is a first angle, and the first angle is 45° ⁇ 95°.
  • At least one lead wire is located outside the preset bending region, and a portion adjacent to the edge of the flexible display panel is further formed with a second hollow portion, and the first insulating layer and the second insulating layer are further connected by the second hollow portion .
  • the angle between the cross-sectional boundary of the second hollow portion and the bottom surface is a second angle, and the second angle is smaller than the first angle.
  • the preset bending region is located between the display area of the flexible display panel and the edge of the flexible display panel; a plurality of signal lines are formed in the display area; and the lead wire is formed between the display area and the edge of the flexible display panel for Connecting the signal line; at least one lead is located outside the predetermined bending area, and a portion adjacent to the display area is further formed with a third hollow portion, and the first insulating layer and the second insulating layer are further connected by the third hollow portion.
  • the angle between the cross-sectional boundary of the third hollow portion and the bottom surface is a third angle, and the third angle is smaller than the first angle.
  • the formed first hollow portion has a first opening facing the first insulating layer; in the predetermined bending region, the first opening of the first hollow portion on the portion of the lead having a wider line width is larger than a first opening of the first hollow portion on the portion of the narrow line width.
  • each of the leads is formed with a plurality of first hollow portions arranged along the extending direction of the lead in the predetermined bending region; the length of each lead gradually increases from the center to the edge, and the length of each lead The distribution density of a hollow portion gradually decreases as the length of the lead increases.
  • each of the leads is formed with a plurality of first hollow portions arranged along the extending direction of the lead in the predetermined bending region; the length of each lead gradually increases from the center to the edge, and the length of each lead The volume of the hollow portion of a hollow portion gradually decreases as the length of the lead increases.
  • an embodiment of the present disclosure further provides a flexible display device 200 including the above flexible display panel 100.
  • the flexible display device 200 further includes a counter substrate 201 disposed opposite to the flexible display panel 100.
  • the display device may be specifically a product or a component having any display function, such as a display, a television, a mobile phone, a tablet computer, a smart wristband, a digital photo frame, and a navigator.

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PCT/CN2019/083718 2018-04-28 2019-04-22 柔性显示面板及柔性显示装置 Ceased WO2019206092A1 (zh)

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US16/616,272 US11119538B2 (en) 2018-04-28 2019-04-22 Flexible display panel and flexible display device
JP2019570372A JP7289269B2 (ja) 2018-04-28 2019-04-22 フレキシブル表示パネルとフレキシブル表示装置
KR1020197037311A KR102337079B1 (ko) 2018-04-28 2019-04-22 플렉서블 디스플레이 패널 및 플렉서블 디스플레이 디바이스

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