CN117545314A - Display panel - Google Patents
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- CN117545314A CN117545314A CN202311567529.7A CN202311567529A CN117545314A CN 117545314 A CN117545314 A CN 117545314A CN 202311567529 A CN202311567529 A CN 202311567529A CN 117545314 A CN117545314 A CN 117545314A
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- 239000011159 matrix material Substances 0.000 claims abstract description 28
- 239000010410 layer Substances 0.000 claims description 212
- 239000000758 substrate Substances 0.000 claims description 98
- 239000000463 material Substances 0.000 claims description 13
- 239000002346 layers by function Substances 0.000 claims description 11
- 238000005538 encapsulation Methods 0.000 claims description 10
- 239000003086 colorant Substances 0.000 claims description 3
- 230000003287 optical effect Effects 0.000 description 14
- 239000012790 adhesive layer Substances 0.000 description 8
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 2
- 229920005591 polysilicon Polymers 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000005401 electroluminescence Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/60—OLEDs integrated with inorganic light-sensitive elements, e.g. with inorganic solar cells or inorganic photodiodes
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
- H10K59/122—Pixel-defining structures or layers, e.g. banks
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/30—Devices specially adapted for multicolour light emission
- H10K59/38—Devices specially adapted for multicolour light emission comprising colour filters or colour changing media [CCM]
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- 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
- H10K59/40—OLEDs integrated with touch screens
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/80—Constructional details
- H10K59/8791—Arrangements for improving contrast, e.g. preventing reflection of ambient light
- H10K59/8792—Arrangements for improving contrast, e.g. preventing reflection of ambient light comprising light absorbing layers, e.g. black layers
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- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Sustainable Development (AREA)
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Image Input (AREA)
Abstract
The invention provides a display panel, which comprises a driving backboard, a pixel defining layer, a light-emitting unit and a color film layer, wherein the pixel defining layer and the color film layer are sequentially overlapped on one side of the driving backboard; the driving backboard comprises a fingerprint identification structure, the fingerprint identification structure comprises a fingerprint identification element, and the fingerprint identification element is positioned in a forward projection area of the black matrix on the driving backboard; the pixel defining layer is also provided with a first through hole, the black matrix is provided with a second through hole, the orthographic projection centers of the first through hole and the second through hole on the driving backboard are overlapped, and the orthographic projection of the first through hole and the second through hole on the driving backboard is positioned in the orthographic projection area of the fingerprint identification element on the driving backboard. The display panel can reduce the interference of stray light on fingerprint identification information and reduce the signal-to-noise ratio of the fingerprint identification element.
Description
Technical Field
The invention belongs to the field of display, and particularly relates to a display panel.
Background
Aiming at a COE OLED (Color Filter on Encap Organic Light-emission Diode) screen, namely an organic electroluminescence display adopting a color filter, the optical fingerprint recognition application is integrated in the screen at present, and the main scheme is that an independent fingerprint recognition module is attached to an OLED display panel to realize the fingerprint recognition function. However, this solution increases the thickness of the display module, and cannot be applied to OLED folding screen products.
Disclosure of Invention
The invention provides a display panel aiming at the problem that the signal to noise ratio of a fingerprint identification sensor in a COE OLED screen is high due to stray interference light and external strong light. The display panel can improve or avoid the incidence of stray interference light from the light-emitting element and the external environment to the fingerprint identification element, thereby improving or avoiding the interference influence of the stray interference light on fingerprint information identified by the fingerprint identification element, reducing the optical noise of the fingerprint identification element, reducing the signal to noise ratio of the fingerprint identification element and improving the accuracy of fingerprint identification of the fingerprint identification element.
The invention provides a display panel, which comprises a driving backboard, a pixel defining layer, a light emitting unit and a color film layer, wherein the pixel defining layer and the color film layer are sequentially overlapped on one side of the driving backboard, an opening is formed in the pixel defining layer, and the light emitting unit is positioned in the opening;
the color film layer comprises a color resistance layer and a black matrix, the orthographic projection of the color resistance layer on the driving backboard covers the orthographic projection of the light-emitting unit on the driving backboard, and the black matrix is not overlapped with the orthographic projection of the light-emitting unit on the driving backboard;
the drive back plate comprises a fingerprint identification structure, the fingerprint identification structure comprises a fingerprint identification element,
the fingerprint identification element is positioned in a forward projection area of the black matrix on the driving backboard;
the pixel defining layer is also provided with a first through hole, the black matrix is provided with a second through hole, the orthographic projection centers of the first through hole and the second through hole on the driving backboard coincide, and the orthographic projection of the first through hole and the second through hole on the driving backboard is positioned in the orthographic projection area of the fingerprint identification element on the driving backboard.
In some embodiments, the driving back plate comprises a substrate, a pixel circuit, a conductive connection structure, the light emitting unit comprises an anode, the pixel circuit, the conductive connection structure and the anode are sequentially stacked on one side of the substrate near the pixel defining layer,
a first insulating layer is further arranged between the pixel circuit and the conductive connecting structure, a second insulating layer is further arranged between the conductive connecting structure and the anode, the conductive connecting structure is electrically connected with the pixel circuit through a first via hole formed in the first insulating layer, and the conductive connecting structure is electrically connected with the anode through a second via hole formed in the second insulating layer;
the fingerprint identification element comprises a first electrode, a main body part and a second electrode, wherein the first electrode, the main body part and the second electrode are sequentially far away from the substrate and are overlapped, the second insulating layer also extends between the main body part and the second electrode,
the first electrode and the conductive connecting structure are arranged on the same layer, the second electrode and the anode are arranged on the same layer, and the second electrode and the main body are electrically connected through a third via hole formed in the second insulating layer.
In some embodiments, the second electrode has a third via opening therein,
the third through hole coincides with the orthographic projection centers of the first through hole and the second through hole on the substrate, and orthographic projections of the third through hole, the first through hole and the second through hole on the substrate are positioned in an orthographic projection area of the main body part on the substrate;
the display panel further comprises a support structure positioned between the pixel defining layer and the color film layer, and the orthographic projection of the support structure on the substrate is positioned in the orthographic projection area of the black matrix on the substrate;
the support structure is filled in the first through hole and the third through hole, and orthographic projection of the support structure on the substrate covers orthographic projections of the first through hole and the third through hole on the substrate;
a distance between a side surface of the support structure facing away from the substrate and the substrate is greater than a distance between a side surface of the pixel defining layer facing away from the substrate and the substrate;
the light-emitting unit further comprises a light-emitting functional layer and a cathode, orthographic projections of the light-emitting functional layer and the cathode on the substrate at least cover the opening, the anode is exposed at the opening, the anode, the light-emitting functional layer and the cathode are sequentially far away from the substrate and are overlapped, and the cathode also extends to one side of the supporting structure, which is far away from the substrate;
the support structure adopts a second filter material, and the second filter material can filter light which is not reflected by fingerprints.
In some embodiments, the first, second, and third through holes are the same shape and size as orthographic projections on the substrate.
In some embodiments, the color filter further comprises an encapsulation layer and a touch layer, which are sequentially stacked on one side of the light emitting unit and the support structure, which is away from the substrate, and the encapsulation layer and the touch layer are positioned on one side of the color filter layer, which is close to the substrate,
the orthographic projection of the touch control layer on the substrate is positioned in the orthographic projection area of the black matrix on the substrate,
the touch control layer comprises a first touch control pattern and a second touch control pattern, the first touch control pattern and the second touch control pattern are sequentially far away from the substrate and are overlapped, a third insulating layer is further arranged between the first touch control pattern and the second touch control pattern, and part of the second touch control pattern is electrically connected with the first touch control pattern through a fourth via hole formed in the third insulating layer;
the first touch pattern and the second touch pattern do not overlap with orthographic projections of the first through hole, the second through hole and the third through hole on the substrate.
In some embodiments, the fingerprint identification structure further comprises a fingerprint identification driving circuit electrically connected to the fingerprint identification element;
the fingerprint identification driving circuit and the pixel circuit are arranged on the same layer, and the fingerprint identification driving circuit is electrically connected with the first electrode through a fifth via hole formed in the first insulating layer.
In some embodiments, the light emitting units include a first light emitting unit, a second light emitting unit and a third light emitting unit,
the first light-emitting unit, the second light-emitting unit and the third light-emitting unit have different light-emitting colors, and the number of the first light-emitting unit, the second light-emitting unit and the third light-emitting unit is a plurality of light-emitting units respectively,
the plurality of first light-emitting units, the plurality of second light-emitting units and the plurality of third light-emitting units are integrally arranged in an array,
the second light emitting units are positioned in odd rows of the array, the first light emitting units and the third light emitting units are positioned in even rows of the array, the first light emitting units and the third light emitting units in the even rows are alternately arranged,
the light emitting cells of the odd numbered rows and the light emitting cells of the even numbered rows are respectively located in different columns,
the number of the fingerprint identification elements is a plurality, the fingerprint identification elements are arranged in an array,
each fingerprint identification element is respectively positioned between two adjacent second light emitting units along the row direction, or each fingerprint identification element is respectively positioned between two adjacent second light emitting units along the column direction.
In some embodiments, the first, second and third light emitting units constitute a pixel unit,
the number of the fingerprint identification elements is equal to the number of the pixel units; alternatively, the number of fingerprint recognition elements is smaller than the number of pixel units.
In some embodiments, the fingerprint recognition driving circuit includes a transistor, a first gate line, a second gate line, a signal readout line, and a bias signal line,
the transistor comprises a first grid electrode, an active layer, a second grid electrode, a source electrode and a drain electrode, wherein the source electrode and the drain electrode are arranged on the same layer, the first grid electrode, the active layer, the second grid electrode and the source electrode are sequentially overlapped along the direction away from the substrate,
a first gate insulating layer is further arranged between the first gate and the active layer, a second gate insulating layer is further arranged between the second gate and the active layer, an intermediate dielectric layer is further arranged between the source electrode and the drain electrode and between the source electrode and the second gate, and the source electrode and the drain electrode are respectively and electrically connected with the two opposite ends of the active layer through a sixth via hole and a seventh via hole which are respectively arranged in the intermediate dielectric layer and the second gate insulating layer;
the first grid line and the first grid electrode are arranged in the same layer and are electrically connected, and the second grid line and the second grid electrode are arranged in the same layer and are electrically connected;
the signal reading line and the drain electrode are arranged on the same layer of the conductive connection structure, and are electrically connected through an eighth via hole formed in the first insulating layer; the source electrode is electrically connected with the first electrode through the fifth via hole;
the bias signal line is arranged on the same layer as the second electrode and is electrically connected with the second electrode.
In some embodiments, the number of the first gate line, the second gate line, the signal readout line and the bias signal line is plural,
the first grid lines and the second grid lines extend along the row direction of the array, one first grid line and one second grid line are distributed between two adjacent rows of fingerprint identification elements, and one first grid line and one second grid line are electrically connected with one row of fingerprint identification elements;
the signal reading lines extend along the column direction of the array, and one signal reading line is correspondingly and electrically connected with one column of the fingerprint identification elements;
the offset signal lines are S-shaped and extend along the row direction of the array, the offset signal lines do not overlap with the orthographic projection of the anode on the substrate, and one offset signal line is correspondingly and electrically connected with one row of fingerprint identification elements.
The invention has the beneficial effects that: according to the display panel provided by the invention, the fingerprint identification structure is integrated in the driving backboard, and meanwhile, the first through holes are formed in the pixel definition layer in the area corresponding to the fingerprint identification element, and the second through holes are formed in the black matrix in the area corresponding to the fingerprint identification element, so that fingerprint reflection light can be incident on the fingerprint identification element through the first through holes and the second through holes, and the fingerprint identification element can identify fingerprint valleys and ridges; meanwhile, the pixel definition layer can filter light emitted by the light-emitting unit, and the black matrix can shield or filter external environment light, so that the incidence of stray interference light from the light-emitting element and the external environment to the fingerprint identification element can be improved or avoided, the interference influence of the stray interference light on fingerprint information identified by the fingerprint identification element is further improved or avoided, the optical noise of the fingerprint identification element is reduced, the signal to noise ratio of the fingerprint identification element is reduced, and the fingerprint identification accuracy of the fingerprint identification element is improved.
Drawings
FIG. 1 is a schematic cross-sectional view of a display panel according to an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of a finger print recognition element in accordance with an embodiment of the present invention;
FIG. 3 is a schematic top view of an array of fingerprint recognition elements in a fingerprint recognition area according to an embodiment of the present invention;
FIG. 4a is a schematic top view illustrating an arrangement of a light emitting unit and a fingerprint recognition element in a display panel according to an embodiment of the present invention;
FIG. 4b is a schematic top view illustrating another arrangement of the light emitting unit and the fingerprint recognition element in the display panel according to the embodiment of the present invention;
FIG. 4c is a schematic top view illustrating another arrangement of the light emitting unit and the fingerprint recognition element in the display panel according to the embodiment of the present invention;
FIG. 4d is a schematic top view illustrating another arrangement of the light emitting unit and the fingerprint recognition element in the display panel according to the embodiment of the present invention;
fig. 5 a-5 l are schematic top views illustrating the design of each film layer of the fingerprint recognition structure in the display panel according to the embodiment of the invention.
Wherein the reference numerals are as follows:
1. a drive back plate; 10. a substrate; 11. a fingerprint identification structure; 110. a fingerprint identification element; 1101. a first electrode; 1102. a main body portion; 1103. a second electrode; A. a third through hole; 111. a fingerprint identification driving circuit; 1110. a transistor; 1111. a first gate line; 1112. a second gate line; 1113. a signal readout line; 1114. biasing the signal line; 12. a pixel circuit; 120. a first transistor; 13. a conductive connection structure; 14. a first insulating layer; 140. a first via; 141. a fifth via; 142. an eighth via; 15. a second insulating layer; 150. a second via; 151. a third via; 2. a pixel defining layer; 20. a first through hole; 3. a light emitting unit; 30. an anode; 31. a light-emitting functional layer; 32. a cathode; 301. a first light emitting unit; 302. a second light emitting unit; 303. a third light emitting unit; 4. a color film layer; 41. a color resist layer; 42. a black matrix; 420. a second through hole; 5. a support structure; 6. an encapsulation layer; 7. a touch layer; 71. a first touch pattern; 72. a second touch pattern; 8. a third insulating layer; 80. a fourth via; 9. a light shielding layer; 16. a first impedance layer; 17. a second impedance layer; 18. a buffer layer; 19. a first optical adhesive layer; 21. and a second optical adhesive layer.
Detailed Description
In order to make the technical scheme of the present invention better understood by those skilled in the art, a display panel of the present invention is described in further detail below with reference to the accompanying drawings and detailed description.
At present, a fingerprint identification sensor is integrated in a COE OLED screen, so that the function of fingerprint identification in the COE OLED screen is realized. However, in the existing scheme, stray interference light easily enters the upper surface or the side surface of the fingerprint identification sensor, and meanwhile, external strong light also can influence the fingerprint identification sensor to identify fingerprints, so that the optical noise of the fingerprint identification sensor is large, and the signal-to-noise ratio of the fingerprint identification sensor is high.
In order to solve the problem that the signal to noise ratio of the fingerprint identification sensor in the COE OLED screen is high due to the stray interference light and the external strong light, the embodiment of the invention provides a display panel, as shown in fig. 1, which comprises a driving backboard 1, a pixel defining layer 2, a light emitting unit 3 and a color film layer 4, wherein the pixel defining layer 2 and the color film layer 4 are sequentially overlapped on one side of the driving backboard 1, an opening is formed in the pixel defining layer 2, and the light emitting unit 3 is positioned in the opening; the pixel defining layer 2 adopts a first filter material, the first filter material can filter light emitted by the light emitting unit 3, the color film layer 4 comprises a color resistance layer 41 and a black matrix 42, the orthographic projection of the color resistance layer 41 on the driving backboard 1 covers the orthographic projection of the light emitting unit 3 on the driving backboard 1, and the black matrix 42 is not overlapped with the orthographic projection of the light emitting unit 3 on the driving backboard 1; the drive back plate 1 comprises a fingerprint recognition structure 11, the fingerprint recognition structure 11 comprises fingerprint recognition elements 110, and the fingerprint recognition elements 110 are positioned in the forward projection area of the black matrix 42 on the drive back plate 1; the pixel defining layer 2 is further provided with a first through hole 20, the black matrix 42 is provided with a second through hole 420, the orthographic projection centers of the first through hole 20 and the second through hole 420 on the driving backboard 1 are coincident, and the orthographic projection of the first through hole 20 and the second through hole 420 on the driving backboard 1 is located in the orthographic projection area of the fingerprint identification element 110 on the driving backboard 1.
Among them, the light emitting unit 3 employs an organic electroluminescent element (i.e., an OLED light emitting element). The color film layer 4 can improve or avoid reflection of ambient light by the display panel. The apertures of the first through hole 20 and the second through hole 420 are all in micron order, the first through hole 20 and the second through hole 420 can form a collimation structure, the fingerprint identification element 110 can receive fingerprint reflection light rays through the first through hole 20 and the second through hole 420 with the centers coincident, and therefore recognition of fingerprint valleys and ridges is achieved.
In this embodiment, the fingerprint identification structure 11 is integrated in the driving backboard 1, and meanwhile, by forming the first through hole 20 in the pixel defining layer 2 corresponding to the area of the fingerprint identification element 110 and forming the second through hole 420 in the black matrix 42 corresponding to the area of the fingerprint identification element 110, the fingerprint reflection light can be incident on the fingerprint identification element 110 through the first through hole 20 and the second through hole 420, so as to realize the identification of the fingerprint identification element 110 on the fingerprint valleys and ridges; meanwhile, the pixel defining layer 2 can filter out the light emitted by the light emitting unit 3, and the black matrix 42 can shield or filter out the external environment light, so that the incidence of stray interference light from the light emitting element 3 and the external environment to the fingerprint identification element 110 can be improved or avoided, the interference influence of the stray interference light on the fingerprint identification element 110 for identifying fingerprint information is further improved or avoided, the optical noise of the fingerprint identification element 110 is reduced, the signal to noise ratio of the fingerprint identification element 110 is reduced, and the accuracy of fingerprint identification of the fingerprint identification element 110 is improved.
In some embodiments, as shown in fig. 1 and 2, the driving back plate 1 includes a substrate 10, a pixel circuit 12, and a conductive connection structure 13, the light emitting unit 3 includes an anode 30, the pixel circuit 12, the conductive connection structure 13, and the anode 30 are sequentially stacked on one side of the substrate 10 near the pixel defining layer 2, a first insulating layer 14 is further disposed between the pixel circuit 12 and the conductive connection structure 13, a second insulating layer 15 is further disposed between the conductive connection structure 13 and the anode 30, the conductive connection structure 13 and the pixel circuit 12 are electrically connected through a first via hole 140 formed in the first insulating layer 14, and the conductive connection structure 13 and the anode 30 are electrically connected through a second via hole 150 formed in the second insulating layer 15; the fingerprint recognition element 110 includes a first electrode 1101, a main body portion 1102, and a second electrode 1103, where the first electrode 1101, the main body portion 1102, and the second electrode 1103 are sequentially stacked away from the substrate 10, the second insulating layer 15 further extends between the main body portion 1102 and the second electrode 1103, the first electrode 1101 is disposed in the same layer as the conductive connection structure 13, the second electrode 1103 is disposed in the same layer as the anode 30, and the second electrode 1103 is electrically connected to the main body portion 1102 through a third via 151 formed in the second insulating layer 15.
In some embodiments, the body portion 1102 includes an N-aSi layer, an I-aSi layer, a P-aSi layer, and an ITO layer that are stacked sequentially away from the substrate 10. The first insulating layer 14 includes a first planarization layer PLN1 and a passivation layer PVX stacked sequentially away from the substrate 10, and the second insulating layer 15 includes an inorganic capping layer Cover and a second planarization layer PLN2 stacked sequentially away from the substrate 10.
In some embodiments, the second electrode 1103 has a third through hole a formed therein, the third through hole a coincides with the orthographic projection centers of the first through hole 20 and the second through hole 420 on the substrate 10, and the orthographic projections of the third through hole a, the first through hole 20 and the second through hole 420 on the substrate 10 are located in the orthographic projection area of the main body 1102 on the substrate 10; the display panel further comprises a support structure 5 located between the pixel defining layer 2 and the color film layer 4, and the orthographic projection of the support structure 5 on the substrate 10 is located in the orthographic projection area of the black matrix 42 on the substrate 10; the support structure 5 is filled in the first through hole 20 and the third through hole a, and the orthographic projection of the support structure 5 on the substrate 10 covers the orthographic projections of the first through hole 20 and the third through hole a on the substrate 10; the distance h1 between the side surface of the support structure 5 facing away from the substrate 10 and the substrate 10 is greater than the distance h2 between the side surface of the pixel defining layer 2 facing away from the substrate 10 and the substrate 10; the light emitting unit 3 further comprises a light emitting functional layer 31 and a cathode 32, the orthographic projections of the light emitting functional layer 31 and the cathode 32 on the substrate 10 at least cover the opening, the anode 30 is exposed at the opening, the anode 30, the light emitting functional layer 31 and the cathode 32 are sequentially overlapped far away from the substrate 10, and the cathode 32 also extends to one side of the supporting structure 5 away from the substrate 10; the support structure 5 employs a second filter material that filters out light that is not reflected by the fingerprint.
Wherein, the second electrode 1103 adopts a light-tight metal material. The aperture of the third through hole A is also in micron order, the first through hole 20, the second through hole 420 and the third through hole A can form a collimation structure, the fingerprint identification element 110 can receive fingerprint reflection light rays through the first through hole 20, the second through hole 420 and the third through hole A with the centers being coincident, so that the identification of fingerprint valleys and ridges is realized, and the collimation structure can improve the resolution of the fingerprint identification element 110 for fingerprint valley and ridge identification. The surface of the side of the support structure 5 facing away from the substrate 10 is higher than the surface of the side of the pixel defining layer 2 facing away from the substrate 10, i.e. the support structure 5 protrudes above the pixel defining layer 2, so that the support structure can play a role in supporting an evaporation mask (such as an FMM, metal mask) in the evaporation process of the light-emitting functional layer 31. In addition, the supporting structure 5 is made of a light-transmitting material and can filter out light not reflected by the fingerprint, for example, when the light reflected by the fingerprint is the light irradiated onto the light-emitting unit 3, the supporting structure 5 can be made of a material capable of filtering out ambient light; when the light reflected by the fingerprint is ambient light, the support structure 5 may be made of a material that filters out the light that the light emitting unit 3 irradiates onto. The support structure 5 is filled in the first through hole 20 and the third through hole a, and the light emitting function layer 31 and the cathode 32 can be prevented from contacting the fingerprint recognition element 110.
In some embodiments, the shape and size of orthographic projections of the first, second and third through holes 20, 420 and a on the substrate 10 are the same. So arranged, the first through hole 20, the second through hole 420 and the third through hole a can better form an alignment structure, thereby further improving the resolution of the fingerprint identification element 110 for fingerprint valley and ridge identification.
In some embodiments, the apertures of the first and second through holes 20, 420 may also be larger than the aperture of the third through hole a, subject to the manufacturing process conditions.
In some embodiments, the display panel further includes an encapsulation layer 6 and a touch layer 7, the encapsulation layer 6 and the touch layer 7 are sequentially stacked on one side of the light emitting unit 3 and the support structure 5, which is away from the substrate 10, and the encapsulation layer 6 and the touch layer 7 are located on one side of the color film layer 4, which is close to the substrate 10, the orthographic projection of the touch layer 7 on the substrate 10 is located in the orthographic projection area of the black matrix 42 on the substrate 10, the touch layer 7 includes a first touch pattern 71 and a second touch pattern 72, the first touch pattern 71 and the second touch pattern 72 are sequentially stacked far from the substrate 10, and a third insulating layer 8 is further disposed between the first touch pattern 71 and the second touch pattern 72, and part of the second touch pattern 72 is electrically connected with the first touch pattern 71 through a fourth via 80 formed in the third insulating layer 8; the orthographic projections of the first touch pattern 71 and the second touch pattern 72 and the first through hole 20, the second through hole 420 and the third through hole a on the substrate 10 are not overlapped.
The second touch pattern 72 is a touch driving electrode and a touch sensing electrode, the first touch pattern 71 is a bridge pattern, and the first touch pattern 71 and the second touch pattern 72 form a mutual capacitance touch electrode. By disposing the touch layer 7 between the encapsulation layer 6 and the color film layer 4, a FMLOC (Flexible Multi Layer On Cell, touch integrated on a display panel) touch display panel is realized. By enabling the orthographic projection of the touch layer 7 on the substrate 10 to be located in the orthographic projection area of the black matrix 42 on the substrate 10, the light emitting unit 3 is prevented from being blocked by the arrangement of the touch layer 7, so that the light emitting unit 3 in the display panel can emit light normally. By making the first touch pattern 71 and the second touch pattern 72 not overlap with the orthographic projections of the first through hole 20, the second through hole 420 and the third through hole a on the substrate 10, the first touch pattern 71 and the second touch pattern 72 are prevented from shielding the channel of the fingerprint identification element 110 for receiving the fingerprint reflection light, so that the arrangement of the first touch pattern 71 and the second touch pattern 72 is ensured not to affect the fingerprint identification element 110 for identifying the fingerprint.
In some embodiments, the first touch pattern 71 and the second touch pattern 72 may be distributed around the first through hole 20, the second through hole 420 and the third through hole a, or an opening may be formed in a region of the first touch pattern 71 and the second touch pattern 72 corresponding to the first through hole 20, the second through hole 420 and the third through hole a, where an orthographic projection area of the opening on the substrate 10 is larger than an orthographic projection area of the first through hole 20, the second through hole 420 and the third through hole a on the substrate 10, and an orthographic projection of the opening on the substrate 10 covers an orthographic projection of the first through hole 20, the second through hole 420 and the third through hole a on the substrate 10.
In some embodiments, a buffer layer 18 is further disposed between the encapsulation layer 6 and the touch layer 7, and the buffer layer 18 is made of an inorganic insulating material. A first optical adhesive layer 19 is further arranged between the touch control layer 7 and the color film layer 4, and a second optical adhesive layer 21 is further arranged on one side of the color film layer 4 away from the substrate 10. The first optical adhesive layer 19 and the second optical adhesive layer 21 are made of light-transmitting materials, the first optical adhesive layer 19 can enable the surface of one side of the touch control layer 7, which faces away from the substrate 10, to be flat, and the second optical adhesive layer 21 can enable the surface of one side of the color film layer 4, which faces away from the substrate 10, to be flat, and meanwhile, the color film layer 4 is protected.
In some embodiments, as shown in fig. 1 and 3, the fingerprint identification structure 11 further includes a fingerprint identification driving circuit 111, where the fingerprint identification driving circuit 111 is electrically connected to the fingerprint identification element 110; the fingerprint recognition driving circuit 111 is provided in the same layer as the pixel circuit 12, and the fingerprint recognition driving circuit 111 is electrically connected to the first electrode 1101 through the fifth via hole 141 provided in the first insulating layer 14.
In some embodiments, as shown in fig. 4a, fig. 4b, fig. 4c, and fig. 4d, the light emitting unit 3 includes a first light emitting unit 301, a second light emitting unit 302, and a third light emitting unit 303, the light emitting colors of the first light emitting unit 301, the second light emitting unit 302, and the third light emitting unit 303 are different, the number of the first light emitting unit 301, the second light emitting unit 302, and the third light emitting unit 303 is respectively a plurality, the first light emitting unit 301, the second light emitting unit 302, and the third light emitting unit 303 are integrally arranged in an array, the second light emitting unit 302 is located in an odd-numbered row of the array, the first light emitting unit 301 and the third light emitting unit 303 are alternately arranged in an even-numbered row, the light emitting unit 3 in the odd-numbered row and the light emitting unit 3 in the even-numbered row are respectively located in different columns, the number of the fingerprint identification elements 110 is a plurality, the fingerprint identification elements 110 are arranged in an array, each fingerprint identification element 110 is respectively located between two second light emitting units 302 adjacent in a row direction, or each fingerprint identification element 110 is respectively located between two adjacent fingerprint identification elements 302 in a row direction.
Wherein the light emitting units 3 of the odd numbered rows are located in even numbered columns or odd numbered columns, and the light emitting units 3 of the even numbered rows are located in odd numbered columns or even numbered columns. The fingerprint recognition element 110 is located between the adjacent second light emitting units 302 so as not to affect the normal light emission of the light emitting units 3 in the display panel, and at the same time, can also realize the recognition of fingerprints.
In some embodiments, as shown in fig. 4a and 4b, the first light emitting unit 301, the second light emitting unit 302, and the third light emitting unit 303 constitute pixel units, and the number of fingerprint recognition elements 110 is equal to the number of pixel units; i.e. the resolution of the fingerprint recognition element 110 is equal to the display resolution; alternatively, as shown in fig. 4c and 4d, the number of fingerprint recognition elements 110 is smaller than the number of pixel units; i.e. the resolution of the fingerprint recognition element 110 is smaller than the display resolution.
In some embodiments, as shown in fig. 1, 3, 5a, 5b, 5c, 5d, 5e, 5f, 5g, 5h, 5i, 5j, 5k, and 5l, the fingerprint identification driving circuit 111 includes a transistor 1110, a first gate line 1111, a second gate line 1112, a signal readout line 1113, and a bias signal line 1114, the transistor 1110 includes a first gate a, an active layer b, a second gate c, a source d, and a drain e, the source d and the drain e are disposed in the same layer, the first gate a, the active layer b, the second gate c, and the source d are sequentially stacked in a direction away from the substrate 10, a first gate insulating layer GI1 is further disposed between the first gate a and the active layer b, a second gate insulating layer 2 is further disposed between the second gate c and the active layer b, an intermediate dielectric layer ILD is further disposed between the source d and the drain e, and the source d and the drain e are respectively connected to a seventh via-hole g through a second gate insulating layer f and a seventh via-hole formed in the intermediate dielectric layer ILD and the second gate layer 2; the first grid line 1111 is arranged in the same layer as the first grid electrode a and is electrically connected with the first grid electrode a, and the second grid line 1112 is arranged in the same layer as the second grid electrode c and is electrically connected with the second grid electrode c; the signal readout line 1113 is disposed on the same layer as the conductive connecting structure 13, and the signal readout line 1113 is electrically connected to the drain e through the eighth via 142 formed in the first insulating layer 14; the source d is electrically connected to the first electrode 1101 through the fifth via 141; the bias signal line 1114 is provided in the same layer as the second electrode 1103 and is electrically connected thereto.
The signal readout line 1113 is configured to output the electrical signal carrying the fingerprint information output by the fingerprint identification element 110 to a processing chip, and the electrical signal is processed by the processing chip to obtain the fingerprint information. The bias signal line 1114 is used to provide a bias voltage to the active fingerprint identification element 110 to ensure proper operation of the fingerprint identification element 110.
In some embodiments, the active layer b may be made of a low temperature polysilicon material or an Oxide semiconductor material, i.e., the transistor 1110 may be a low temperature polysilicon transistor (LTPS) or an Oxide semiconductor transistor (Oxide).
In some embodiments, as shown in fig. 1, the pixel circuit 12 includes a plurality of first transistors 120, at least a portion of the gates of the first transistors 120 are disposed in the same layer as the first gate a of the transistor 1110, and the sources and drains of the first transistors 120 are disposed in the same layer as the sources d and drains e of the transistor 1110, and the pixel circuit 12 is a conventional circuit and will not be described herein. In addition, a light shielding layer 9 is further disposed between at least a portion of the first transistor 120 and the substrate 10, and an orthographic projection of the light shielding layer 9 on the substrate 10 covers an orthographic projection of an overlapping area of an active layer and a gate of the first transistor 120 on the substrate 10, and the light shielding layer 9 can shield light irradiated onto the active layer, so as to prevent an increase of a leakage current of the first transistor 120 under illumination. A first resistive layer 16 is provided between the light shielding layer 9 and the substrate 10, and a second resistive layer 17 is provided between the light shielding layer 9 and the first transistor 120. The first resistance layer 16 and the second resistance layer 17 are made of an inorganic insulating material such as silicon nitride or silicon oxide. The first transistor 120 may be a dual gate transistor, and a third gate insulating layer GI3 is further disposed between the gate electrode of the first transistor 120 and the active layer.
In some embodiments, as shown in fig. 3, 5a, 5b, 5c, 5d, 5e, 5f, 5g, 5h, 5i, 5j, 5k, and 5l, the number of the first grid lines 1111, the second grid lines 1112, the signal readout lines 1113, and the bias signal lines 1114 is multiple, the first grid lines 1111 and the second grid lines 1112 extend along the row direction X of the array, one first grid line 1111 and one second grid line 1112 are distributed between two adjacent rows of fingerprint identification elements 110, and one first grid line 1111 and one second grid line 1112 are electrically connected to one row of fingerprint identification elements 110; the signal readout lines 1113 extend along the column direction Y of the array, and one signal readout line 1113 is correspondingly and electrically connected to one column of fingerprint identification elements 110; the bias signal lines 1114 are S-shaped and extend along the row direction X of the array, the bias signal lines 1114 do not overlap with the orthographic projection of the anode 30 on the substrate 10, and one bias signal line 1114 is correspondingly electrically connected to a row of fingerprint identification elements 110.
The bias signal line 1114 extends to an edge of the display area of the display panel and is electrically connected to a bias voltage supply chip, and the bias voltage supply chip supplies a bias voltage signal to the bias signal line 1114. When the array of fingerprint identification elements 110 is driven, a plurality of bias signal lines 1114 simultaneously input bias voltage signals, a first grid line 1111 and a second grid line 1112 scan line by line, and a plurality of signal readout lines 1113 read out signals simultaneously, so as to drive the readout signals line by line for the fingerprint identification elements 110, and realize fingerprint identification.
According to the display panel provided by the embodiment of the invention, the fingerprint identification structure is integrated in the driving backboard, and meanwhile, the first through holes are formed in the pixel definition layer in the area corresponding to the fingerprint identification element, and the second through holes are formed in the black matrix in the area corresponding to the fingerprint identification element, so that fingerprint reflection light can be incident on the fingerprint identification element through the first through holes and the second through holes, and the fingerprint identification element can identify fingerprint valleys and ridges; meanwhile, the pixel definition layer can filter light emitted by the light-emitting unit, and the black matrix can shield or filter external environment light, so that the incidence of stray interference light from the light-emitting element and the external environment to the fingerprint identification element can be improved or avoided, the interference influence of the stray interference light on fingerprint information identified by the fingerprint identification element is further improved or avoided, the optical noise of the fingerprint identification element is reduced, the signal to noise ratio of the fingerprint identification element is reduced, and the fingerprint identification accuracy of the fingerprint identification element is improved.
The display panel may be: OLED panels, OLED televisions, electronic paper, mobile phones, tablet computers, notebook computers, displays, notebook computers, digital photo frames, navigator and any other products or components with display functions.
It is to be understood that the above embodiments are merely illustrative of the application of the principles of the present invention, but not in limitation thereof. Various modifications and improvements may be made by those skilled in the art without departing from the spirit and substance of the invention, and are also considered to be within the scope of the invention.
Claims (10)
1. The display panel comprises a driving backboard, a pixel defining layer, a light emitting unit and a color film layer, wherein the pixel defining layer and the color film layer are sequentially overlapped on one side of the driving backboard, an opening is formed in the pixel defining layer, and the light emitting unit is positioned in the opening;
the color film layer comprises a color resistance layer and a black matrix, the orthographic projection of the color resistance layer on the driving backboard covers the orthographic projection of the light-emitting unit on the driving backboard, and the black matrix is not overlapped with the orthographic projection of the light-emitting unit on the driving backboard;
it is characterized in that the driving backboard comprises a fingerprint identification structure, the fingerprint identification structure comprises a fingerprint identification element,
the fingerprint identification element is positioned in a forward projection area of the black matrix on the driving backboard;
the pixel defining layer is also provided with a first through hole, the black matrix is provided with a second through hole, the orthographic projection centers of the first through hole and the second through hole on the driving backboard coincide, and the orthographic projection of the first through hole and the second through hole on the driving backboard is positioned in the orthographic projection area of the fingerprint identification element on the driving backboard.
2. The display panel of claim 1, wherein the driving back plate comprises a substrate, a pixel circuit, and a conductive connection structure, the light emitting unit comprises an anode, the pixel circuit, the conductive connection structure, and the anode are sequentially stacked on a side of the substrate near the pixel defining layer,
a first insulating layer is further arranged between the pixel circuit and the conductive connecting structure, a second insulating layer is further arranged between the conductive connecting structure and the anode, the conductive connecting structure is electrically connected with the pixel circuit through a first via hole formed in the first insulating layer, and the conductive connecting structure is electrically connected with the anode through a second via hole formed in the second insulating layer;
the fingerprint identification element comprises a first electrode, a main body part and a second electrode, wherein the first electrode, the main body part and the second electrode are sequentially far away from the substrate and are overlapped, the second insulating layer also extends between the main body part and the second electrode,
the first electrode and the conductive connecting structure are arranged on the same layer, the second electrode and the anode are arranged on the same layer, and the second electrode and the main body are electrically connected through a third via hole formed in the second insulating layer.
3. The display panel of claim 2, wherein the second electrode has a third via hole formed therein,
the third through hole coincides with the orthographic projection centers of the first through hole and the second through hole on the substrate, and orthographic projections of the third through hole, the first through hole and the second through hole on the substrate are positioned in an orthographic projection area of the main body part on the substrate;
the display panel further comprises a support structure positioned between the pixel defining layer and the color film layer, and the orthographic projection of the support structure on the substrate is positioned in the orthographic projection area of the black matrix on the substrate;
the support structure is filled in the first through hole and the third through hole, and orthographic projection of the support structure on the substrate covers orthographic projections of the first through hole and the third through hole on the substrate;
a distance between a side surface of the support structure facing away from the substrate and the substrate is greater than a distance between a side surface of the pixel defining layer facing away from the substrate and the substrate;
the light-emitting unit further comprises a light-emitting functional layer and a cathode, orthographic projections of the light-emitting functional layer and the cathode on the substrate at least cover the opening, the anode is exposed at the opening, the anode, the light-emitting functional layer and the cathode are sequentially far away from the substrate and are overlapped, and the cathode also extends to one side of the supporting structure, which is far away from the substrate;
the support structure adopts a second filter material, and the second filter material can filter light which is not reflected by fingerprints.
4. The display panel of claim 3, wherein the first through hole, the second through hole, and the third through hole are the same in shape and size as orthographic projected on the substrate.
5. The display panel of claim 3, further comprising an encapsulation layer and a touch layer sequentially stacked on a side of the light emitting unit and the support structure facing away from the substrate, wherein the encapsulation layer and the touch layer are positioned on a side of the color film layer adjacent to the substrate,
the orthographic projection of the touch control layer on the substrate is positioned in the orthographic projection area of the black matrix on the substrate,
the touch control layer comprises a first touch control pattern and a second touch control pattern, the first touch control pattern and the second touch control pattern are sequentially far away from the substrate and are overlapped, a third insulating layer is further arranged between the first touch control pattern and the second touch control pattern, and part of the second touch control pattern is electrically connected with the first touch control pattern through a fourth via hole formed in the third insulating layer;
the first touch pattern and the second touch pattern do not overlap with orthographic projections of the first through hole, the second through hole and the third through hole on the substrate.
6. The display panel of any one of claims 2-5, wherein the fingerprint recognition structure further comprises a fingerprint recognition driving circuit electrically connected to the fingerprint recognition element;
the fingerprint identification driving circuit and the pixel circuit are arranged on the same layer, and the fingerprint identification driving circuit is electrically connected with the first electrode through a fifth via hole formed in the first insulating layer.
7. The display panel of claim 6, wherein the light emitting unit comprises a first light emitting unit, a second light emitting unit and a third light emitting unit,
the first light-emitting unit, the second light-emitting unit and the third light-emitting unit have different light-emitting colors, and the number of the first light-emitting unit, the second light-emitting unit and the third light-emitting unit is a plurality of light-emitting units respectively,
the plurality of first light-emitting units, the plurality of second light-emitting units and the plurality of third light-emitting units are integrally arranged in an array,
the second light emitting units are positioned in odd rows of the array, the first light emitting units and the third light emitting units are positioned in even rows of the array, the first light emitting units and the third light emitting units in the even rows are alternately arranged,
the light emitting cells of the odd numbered rows and the light emitting cells of the even numbered rows are respectively located in different columns,
the number of the fingerprint identification elements is a plurality, the fingerprint identification elements are arranged in an array,
each fingerprint identification element is respectively positioned between two adjacent second light emitting units along the row direction, or each fingerprint identification element is respectively positioned between two adjacent second light emitting units along the column direction.
8. The display panel of claim 7, wherein the first light emitting unit, the second light emitting unit, and the third light emitting unit constitute a pixel unit,
the number of the fingerprint identification elements is equal to the number of the pixel units; alternatively, the number of fingerprint recognition elements is smaller than the number of pixel units.
9. The display panel of claim 7, wherein the fingerprint recognition driving circuit includes a transistor, a first gate line, a second gate line, a signal readout line, and a bias signal line,
the transistor comprises a first grid electrode, an active layer, a second grid electrode, a source electrode and a drain electrode, wherein the source electrode and the drain electrode are arranged on the same layer, the first grid electrode, the active layer, the second grid electrode and the source electrode are sequentially overlapped along the direction away from the substrate,
a first gate insulating layer is further arranged between the first gate and the active layer, a second gate insulating layer is further arranged between the second gate and the active layer, an intermediate dielectric layer is further arranged between the source electrode and the drain electrode and between the source electrode and the second gate, and the source electrode and the drain electrode are respectively and electrically connected with the two opposite ends of the active layer through a sixth via hole and a seventh via hole which are respectively arranged in the intermediate dielectric layer and the second gate insulating layer;
the first grid line and the first grid electrode are arranged in the same layer and are electrically connected, and the second grid line and the second grid electrode are arranged in the same layer and are electrically connected;
the signal reading line and the drain electrode are arranged on the same layer of the conductive connection structure, and are electrically connected through an eighth via hole formed in the first insulating layer; the source electrode is electrically connected with the first electrode through the fifth via hole;
the bias signal line is arranged on the same layer as the second electrode and is electrically connected with the second electrode.
10. The display panel of claim 9, wherein the number of the first gate line, the second gate line, the signal readout line, and the bias signal line are each a plurality of,
the first grid lines and the second grid lines extend along the row direction of the array, one first grid line and one second grid line are distributed between two adjacent rows of fingerprint identification elements, and one first grid line and one second grid line are electrically connected with one row of fingerprint identification elements;
the signal reading lines extend along the column direction of the array, and one signal reading line is correspondingly and electrically connected with one column of the fingerprint identification elements;
the offset signal lines are S-shaped and extend along the row direction of the array, the offset signal lines do not overlap with the orthographic projection of the anode on the substrate, and one offset signal line is correspondingly and electrically connected with one row of fingerprint identification elements.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311567529.7A CN117545314A (en) | 2023-11-22 | 2023-11-22 | Display panel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311567529.7A CN117545314A (en) | 2023-11-22 | 2023-11-22 | Display panel |
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| CN117545314A true CN117545314A (en) | 2024-02-09 |
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| CN202311567529.7A Pending CN117545314A (en) | 2023-11-22 | 2023-11-22 | Display panel |
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