CN107425041B - touch display panel, device and manufacturing method - Google Patents
touch display panel, device and manufacturing method Download PDFInfo
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- CN107425041B CN107425041B CN201710624567.XA CN201710624567A CN107425041B CN 107425041 B CN107425041 B CN 107425041B CN 201710624567 A CN201710624567 A CN 201710624567A CN 107425041 B CN107425041 B CN 107425041B
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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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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0412—Digitisers structurally integrated in a display
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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
- H10K59/1201—Manufacture or treatment
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
- G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
- G06F2203/04103—Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
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Abstract
The embodiment of the invention provides touch display panels, a device and a manufacturing method, wherein the touch display panel comprises a light emitting unit array substrate, the light emitting unit array substrate comprises a substrate and a plurality of light emitting units positioned on the side of the substrate, the light emitting units are arranged in an array mode along the direction and the second direction which are parallel to the plane of the substrate, the direction and the second direction are crossed, a packaging substrate is positioned on the side, far away from the substrate, of the light emitting units, at least fingerprint identification units are positioned on the side, close to the light emitting unit array substrate, of the packaging substrate, each fingerprint identification unit comprises a thin film transistor and a light shielding layer, the vertical projection of the light shielding layer on the packaging substrate covers the vertical projection of the channel area of the thin film transistor on the packaging substrate, and touch electrodes are formed by grid-shaped metal routing wires and are arranged on the same layer with the light shielding layer.
Description
Technical Field
The invention relates to the technical field of display, in particular to touch display panels, devices and a manufacturing method.
Background
An OLED (Organic Light Emitting Diode) display is kinds of self-luminous displays, and compared with an LCD (liquid crystal display), the OLED display does not need a backlight source, so that the OLED display is lighter and thinner.
, since fingerprints are unique to each individual, is unique, along with the development of science and technology, various display devices with fingerprint identification functions, such as mobile phones, tablet computers, intelligent wearable devices and the like, appear in the market.
However, the touch display panel integrating the touch function and the fingerprint recognition function is often thicker, and a process for manufacturing the touch electrode and a process for manufacturing the fingerprint sensor are required to be added on the basis of the existing display panel.
Disclosure of Invention
The invention provides touch display panels, devices and manufacturing methods, which are used for simplifying the process of the touch display panel and thinning the touch display panel.
, an embodiment of the present invention provides touch display panels, including:
the light emitting device comprises a light emitting unit array substrate and a plurality of light emitting units, wherein the light emitting unit array substrate comprises a substrate and a plurality of light emitting units positioned on the side of the substrate , the light emitting units are arranged in an array along a direction and a second direction which are parallel to the plane of the substrate, and the direction and the second direction are crossed;
a package substrate located on an side of the plurality of light emitting cells away from the substrate;
the light-emitting unit array substrate side of the packaging substrate is provided with at least fingerprint identification units, each fingerprint identification unit comprises a thin film transistor and a light shielding layer, and the vertical projection of the light shielding layer on the packaging substrate covers the vertical projection of the channel region of the thin film transistor on the packaging substrate;
and the touch electrode is formed by grid-shaped metal wires and arranged on the same layer with the light shielding layer.
In a second aspect, an embodiment of the present invention provides display devices, including the touch display panel of the aspect.
In a third aspect, an embodiment of the present invention further provides methods for manufacturing the touch display panel of the aspect, including:
providing a package substrate;
forming a light shielding layer, a touch electrode and a thin film transistor of a fingerprint identification unit on the packaging substrate, wherein the light shielding layer and the touch electrode are arranged on the same layer, and the vertical projection of the light shielding layer on the packaging substrate covers the vertical projection of a channel region of the thin film transistor on the packaging substrate;
forming a light emitting unit array substrate, wherein the light emitting unit array substrate comprises a substrate and a plurality of light emitting units positioned on the side of the substrate , the plurality of light emitting units are arranged in an array along a direction and a second direction which are parallel to the plane of the substrate, and the direction and the second direction are crossed;
and packaging the side of the thin film transistor on which the light shielding layer, the touch electrode and the fingerprint identification unit are formed on the packaging substrate and the side of the light emitting unit array substrate on which the plurality of light emitting units are formed.
The touch display panel comprises a light emitting array substrate and a packaging substrate, wherein the light emitting array substrate comprises a substrate and a plurality of light emitting units arranged on the substrate in a matrix manner, the touch display panel also comprises at least fingerprint identification units used for fingerprint detection, the fingerprint identification units are positioned on the side, close to the light emitting unit array substrate , of the packaging substrate, each fingerprint identification unit comprises a thin film transistor and a light shielding layer used for shielding a channel region of the thin film transistor, the light shielding layer blocks light from irradiating the channel region of the thin film transistor, the influence of photo carriers on the thin film transistor of the fingerprint identification units is prevented, a touch electrode of the touch display panel is formed by grid-shaped metal wiring and is arranged on the same layer with the light shielding layer, and therefore the process of simplifying the touch display panel and thinning the touch display panel are achieved.
Drawings
Fig. 1a is a schematic top view of touch display panels according to an embodiment of the present invention;
FIG. 1b is an enlarged view of the structure taken along the area S1 in FIG. 1 a;
FIG. 1c is a schematic cross-sectional view along AA' of FIG. 1 b;
fig. 1d is a schematic cross-sectional view of another kinds of touch display panels according to an embodiment of the present invention;
fig. 2 is a schematic top view of another kinds of touch display panels according to an embodiment of the present invention;
fig. 3 is a schematic top view of another kinds of touch display panels according to an embodiment of the present invention;
fig. 4 is a schematic top view of another kinds of touch display panels according to an embodiment of the present invention;
fig. 5 is a schematic cross-sectional structure diagram of another types of touch display panels according to an embodiment of the present invention;
fig. 6 is a schematic cross-sectional structure diagram of another types of touch display panels according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of display devices according to an embodiment of the present invention;
fig. 8a to 8b are schematic diagrams illustrating a manufacturing process of a part of structures of touch display panels according to an embodiment of the invention;
fig. 9a to 9c are schematic diagrams illustrating a manufacturing process of a partial structure of another touch display panels according to an embodiment of the present invention.
Detailed Description
The present invention will now be described in further detail with reference to the drawings and examples, it being understood that the specific embodiments herein described are merely illustrative of and not restrictive on the broad invention, and it should be further noted that for the purposes of description, only some, but not all, of the structures associated with the present invention are shown in the drawings.
Fig. 1a is a schematic top view structure diagram of touch display panels provided in an embodiment of the present invention, fig. 1b is an enlarged structure diagram along an S1 region in fig. 1a, fig. 1c is a schematic cross-sectional structure diagram along AA' in fig. 1b, and in combination with fig. 1a to 1c, the touch display panel provided in an embodiment of the present invention includes a light emitting unit array substrate 10, a package substrate 20, at least fingerprint identification units 30, and a touch electrode 40, wherein the light emitting unit array substrate 10 includes a substrate 11 and a plurality of light emitting units 12 located on a side of the substrate 11, the plurality of light emitting units 12 are arranged in an array along an direction and a second direction parallel to a plane of the substrate 11, a direction and the second direction intersect, the package substrate 20 is located on a side of the plurality of light emitting units 12 (not shown in fig. 1 c) away from the substrate 11, at least fingerprint identification units 30 are located on a side of the package substrate 20 close to the light emitting unit array substrate 10, the fingerprint identification units 30 include a thin film transistor 36, the light shielding layer 37, the light shielding layer 36 is located on a top of the package substrate 20, and the light shielding layer 36 is located on a bottom gate insulating layer 34, and a thin film transistor 34 is located on a thin film transistor 34, and a thin film transistor 34 located on a thin film transistor substrate 34, and a thin film transistor substrate 37, and a light shielding layer 34 located on a thin film transistor substrate 34, and a thin film transistor substrate 20 located on a thin film transistor substrate 37, and a light shielding layer 37.
The touch display panel provided by the embodiment of the invention comprises a light emitting array substrate and a packaging substrate, wherein the light emitting array substrate comprises a substrate and a plurality of light emitting units which are arranged on the substrate in a matrix manner, the touch display panel also comprises at least fingerprint identification units for fingerprint detection, the fingerprint identification units are positioned on the side, close to the light emitting unit array substrate , of the packaging substrate, each fingerprint identification unit comprises a thin film transistor and a shading layer for shading a channel region of the thin film transistor, the shading layer blocks light from irradiating the channel region of the thin film transistor, and the influence of photo-generated carriers on the thin film transistor of the fingerprint identification units is prevented, a touch electrode of the touch display panel is formed by grid-shaped metal wiring, the touch electrode is set as grid-shaped metal wiring, the impedance of the touch electrode can be reduced in aspect, the touch sensitivity is improved, in addition, in aspect, because the touch electrode is grid-shaped metal, the ductility of the grid-shaped metal is good, the wiring can be further , the bending resistance of the touch electrode can be further improved, the touch electrode and the shading layer are arranged in the same layer, the same material can be adopted in.
Fig. 1d is a schematic cross-sectional structure view of another types of touch display panels provided by the embodiment of the present invention, which is different from fig. 1c, in which the thin film transistor in fig. 1d is a thin film transistor with a bottom-gate structure, as shown in fig. 1d, along a direction in which the thin film transistor 36 is away from the package substrate 20, the thin film transistor 36 sequentially includes a gate electrode 363, a gate insulating layer 362, an active layer 361 (including a channel region of the thin film transistor), a source electrode 364, and a drain electrode 365 (the source electrode and the drain electrode are also referred to as a source drain electrode), and the light shielding layer 37 is located on a side of the active layer 361 away from the package substrate 20.
Alternatively, the fingerprint recognition unit 30 further includes a photodiode D and a storage capacitor C, the fingerprint recognition unit 30 sequentially includes a common electrode 34, a second electrode 33, a PIN junction 32 and a th electrode 31 in a direction away from the substrate 11, the second electrode 33, a th electrode 31 and the PIN junction 32 constitute the photodiode D, the common electrode 34 is electrically connected to the th electrode 31, the second electrode 33 and the common electrode 34 constitute the storage capacitor C, the second electrode 33 may be an anode of the photodiode D, the second electrode 33 may simultaneously serve as a th plate of the storage capacitor C, the th electrode 31 may be a cathode of the photodiode D, the common electrode 34 may be a second plate of the storage capacitor, the fingerprint recognition unit 30 may further include a bridge electrode 35, the second electrode 33 is electrically connected to a drain 365 of the thin film transistor 36 through the bridge electrode 35, it is understood that the drain and drain of the thin film transistor may be interchanged, the th electrode 31 may be formed of Indium Tin Oxide (ITO) material, the transparent electrode reflected light from the fingerprint may pass through the transparent junction 32, and may have a substantially reverse saturation current when the PIN junction 32 is irradiated, and a reverse saturation current may be substantially increased, i.e.
Optionally, the touch display panel includes an opening region 101 and a non-opening region 102, each light-emitting unit 12 includes a plurality of sub-pixel light-emitting regions, in fig. 1b, light-emitting units 12 are exemplarily disposed to include 3 sub-pixel light-emitting regions, which may be a red sub-pixel light-emitting region, a green sub-pixel light-emitting region, and a blue sub-pixel light-emitting region, it is understood that the embodiment of the present invention is not limited thereto, the opening region 101 is a region where the sub-pixel light-emitting regions are located, and the touch electrode 40 and/or the fingerprint identification unit 30 may be located in the non-opening region 102, in fig. 1b, the touch electrode 40 and the fingerprint identification unit 30 are exemplarily disposed to be located in the non-opening region 102, so as to avoid reducing an opening ratio of.
Optionally, the ratio of the overlapping area of the vertical projection of the latticed metal traces of the touch electrode 40 on the package substrate 20 to the vertical projection of the fingerprint identification unit 30 on the package substrate 20 to the area of the vertical projection of the fingerprint identification unit 30 on the package substrate 20 is less than 10%, which ensures that the latticed metal traces constituting the touch electrode 40 are disposed away from the fingerprint identification unit 30 as much as possible, so that the light reflected by the touch body has sufficient light intensity when reaching the fingerprint identification unit 30, thereby ensuring the accuracy of fingerprint identification.
Fig. 2 is a schematic top view structure diagram of another touch display panels according to an embodiment of the present invention, different from fig. 1a, fig. 1a shows a specific distribution of grid-shaped metal traces constituting touch electrodes in the touch display panel, and fig. 2 shows an overall distribution of the touch electrodes, as shown in fig. 2, a touch electrode 40 includes a plurality of touch sensing electrodes 42 and a plurality of touch driving electrodes 41, the touch sensing electrodes 42 are connected to adjacent touch sensing electrodes 42 in columns (X direction), the touch driving electrodes 41 are connected to adjacent touch driving electrodes 41 in rows (Y direction), the touch driving electrodes 41 are connected to adjacent touch driving electrodes 41 in rows (Y direction) through a bridge structure 43, the touch driving electrodes 41 can be used for receiving touch driving signals, the touch sensing electrodes 42 can be used for generating touch sensing signals, mutual capacitances (coupling capacitances) can be formed at positions adjacent to the touch sensing electrodes 42 and the touch driving electrodes 41, when a human body contacts the touch display panel, and mutual capacitances can be formed between the touch sensing electrodes and the touch screen, and further the touch sensing electrodes connected to each other touch driving electrodes can be connected to each other touch sensing electrodes in the adjacent touch driving electrodes, and the touch sensing electrodes can be detected by a specific sensing electrode conversion mode, so that the touch sensing electrodes 6727 and the touch sensing electrodes are connected to the touch sensing electrodes connected to generate multiple touch sensing electrodes connected to the touch sensing electrodes.
Alternatively, referring to fig. 1c, 1d and 2, the bridge structure may be disposed on the same layer as the source/drain or the gate of the thin film transistor, so that the bridge structure and the source/drain or the gate of the thin film transistor are formed in the same process using the same material, so as to further simplify the process of forming the touch display panel.
1 a-2, the touch display panel includes a touch sensing unit 60, and the touch sensing unit 60 is arranged periodically to form the touch electrode structure shown in FIG. 2. in the embodiment of the present invention, the light emitting units 12 are arranged to correspond to the fingerprint identification unit 30 , the distance between the geometric centers of two adjacent light emitting units 12 (also referred to as a pitch) is p, the touch sensing unit 60 is a rectangle (shown by a dashed box in FIG. 2), two right-angled sides of the rectangle extend along the row direction (Y direction) and the column direction (X direction) respectively, and the side lengths are a, b, 3.5mm ≦ a ≦ 5.5mm, 3.5mm ≦ b ≦ 5.5mm, the rectangle overlaps two touch sensing electrodes and two touch driving electrodes, and each side of the rectangle passes through the center of the touch sensing electrode or the touch driving electrode, while the rectangle covers N light emitting units (not shown in FIG. 2), N satisfies:
for example, if a 5.5-inch touch display panel is taken as an example, and the distance p between the geometric centers of two adjacent light-emitting units 12 is 63.25 μm, N satisfies: 3062 and N is not less than 7561. When 3062 is not less than or equal to N is not less than 7561, the size of the touch sensing unit (i.e. the size of the touch sensing electrode and the touch driving electrode) is proper, if the size of the touch sensing unit is too small, too many touch electrode lines need to be arranged, and the redundant touch electrode lines widen the frame of the touch display panel; whileIf the size of the touch sensing unit is too large, the detection of the touch position cannot be accurately realized, and the touch sensitivity of the touch display panel is reduced.
Fig. 3 is a schematic top view of another touch display panels according to an embodiment of the present invention, which is different from the same-layer mutual capacitance touch display panel shown in fig. 2, in which fig. 3 shows a different-layer mutual capacitance touch display panel, and as shown in fig. 3, the touch electrode 40 includes a plurality of touch sensing electrodes 41, that is, the touch sensing electrodes 41 are formed by grid-shaped metal traces and are disposed on the same layer as the light shielding layer in the fingerprint identification unit, the touch display panel further includes a plurality of touch driving electrodes 42 disposed on different layers from the touch sensing electrodes 41, and the touch sensing electrodes 41 are insulated and crossed with the touch driving electrodes 42.
Specifically, the touch sensing electrodes 41 may be arranged along the X direction and extend along the Y direction, the touch driving electrodes 42 may be arranged along the Y direction and extend along the X direction, the X direction intersects with the Y direction, and the touch sensing electrodes 41 are insulated from the touch driving electrodes 42. where the touch sensing electrodes 41 and the touch driving electrodes 42 intersect, mutual capacitance (coupling capacitance) may be formed to enable detection of a touch position according to a variation amount of the coupling capacitance.
Fig. 4 is a schematic top view structure diagram of another touch display panels according to an embodiment of the present invention, which is different from the mutual capacitance type touch display panel shown in fig. 2 and 3, in that the touch display panel shown in fig. 4 is a self-capacitance type touch display panel, as shown in fig. 4, the touch electrode 40 includes a plurality of self-capacitance type touch electrode blocks 400 located on the same layer, the self-capacitance type touch electrode blocks 400 are arranged in an array, each touch electrode block 400 forms a capacitance with, for example, a zero potential energy point ground, when a finger touches or approaches the display panel, a capacitance value at a touch position is increased, and thus, when a touch detection is performed, a position of a touch point can be determined by detecting a change in a corresponding capacitance value.
Alternatively, referring to fig. 1a to 4, the touch display panel further includes a touch electrode line 50, and the touch electrode line 50 is electrically connected to the touch electrode 40. specifically, in the self-contained touch display panel, the touch electrode line may be electrically connected to the touch electrode block, and in the mutual-contained touch display panel, the touch electrode line may be electrically connected to the touch driving electrode and the touch sensing electrode, the touch electrode line 50 may be disposed in the same layer as the gate electrode 363 of the thin film transistor 36, the source electrode 364 of the thin film transistor 36, the drain electrode 365 of the thin film transistor 36, the light shielding layer 37, or the common electrode 34, so as to further simplify the process of forming the touch display panel.
Fig. 5 is a schematic cross-sectional view of another touch display panels according to an embodiment of the present invention, as shown in fig. 5, the light emitting unit 12 is used as a light source of the fingerprint identification unit 30, and light emitted by the light emitting unit 12 (the direction of the arrow in the figure indicates the light propagation direction) is reflected by a touch subject (i.e., a finger fingerprint) to form reflected light to enter the fingerprint identification unit 30 for fingerprint identification.
Fig. 6 is a schematic cross-sectional view of another types of touch display panels according to an embodiment of the present invention, as shown in fig. 6, the touch display panel further includes a fingerprint identification light source 70, the fingerprint identification light source 70 is located on a side surface of the substrate 11 away from the fingerprint identification unit 30, and light emitted by the fingerprint identification light source 70 (the arrow direction in the figure indicates the light propagation direction) is reflected by a touch subject (i.e., a finger fingerprint) to form reflected light to enter the fingerprint identification unit 30 for fingerprint identification.
On the basis of the foregoing embodiments, optionally, when performing fingerprint identification and touch position detection operations, the touch electrode and the fingerprint identification unit are driven to work simultaneously, so as to reduce the time occupied by the fingerprint identification and touch position detection operations. Or, the touch control electrode and the fingerprint identification unit can be driven to work in a time-sharing manner when fingerprint identification and touch control position detection operations are performed. The fingerprint recognition and touch position detection operations may be set according to specific products, which is not limited in the present invention.
An embodiment of the present invention further provides display devices, fig. 7 is a schematic structural diagram of display devices provided in an embodiment of the present invention, and as shown in fig. 7, a display device 100 provided in an embodiment of the present invention includes a touch display panel described in any embodiment of the present invention, which may be a mobile phone as shown in fig. 7, or a computer, a television, an intelligent wearable device, and the like, and this embodiment is not particularly limited thereto.
The embodiment of the invention also provides a manufacturing method of touch display panels, which is used for manufacturing the touch display panel, and the method comprises the following steps:
providing a package substrate;
forming a light shielding layer, a touch electrode and a thin film transistor of a fingerprint identification unit on a packaging substrate, wherein the light shielding layer and the touch electrode are arranged on the same layer, and the vertical projection of the light shielding layer on the packaging substrate covers the vertical projection of a channel region of the thin film transistor on the packaging substrate;
forming a light emitting unit array substrate, wherein the light emitting unit array substrate comprises a substrate and a plurality of light emitting units positioned on the side of the substrate , the plurality of light emitting units are arranged in an array along a direction and a second direction which are parallel to the plane of the substrate, and the direction and the second direction are crossed;
the side of the thin film transistor on which the light shielding layer, the touch electrode and the fingerprint recognition unit are formed on the package substrate and the side on which the plurality of light emitting units are formed on the light emitting unit array substrate are packaged.
In the method for manufacturing the touch display panel provided by the embodiment of the invention, the touch electrode of the touch display panel is formed by the latticed metal wires, the touch electrode is set to be the latticed metal wires, the impedance of the touch electrode can be reduced and the touch sensitivity can be improved in aspect, in addition, in aspect, because the touch electrode is the latticed metal wires, the ductility of the latticed metal wires is good, the bending resistance of the touch electrode can be further improved in step, and the touch electrode and the light shielding layer are arranged in the same layer, and the touch electrode and the light shielding layer can be formed in the same process by adopting the same material, so that the process of the touch display panel is simplified and the touch display panel is lighter and.
Fig. 8a to 8b are schematic diagrams illustrating a manufacturing process of a partial structure of touch display panels according to an embodiment of the present invention, and referring to fig. 8a to 8b, the step of forming a light shielding layer, a touch electrode, and a thin film transistor of a fingerprint identification unit on a package substrate may include:
forming a light-shielding layer 37 and a touch electrode 40 on the package substrate 20;
an active layer 361, a gate insulating layer 362, a gate electrode 363, and a source electrode 364 and a drain electrode 365 (the source electrode and the drain electrode are collectively referred to as a source drain electrode) of the thin film transistor 36 are formed in this order.
Fig. 9a to 9c are schematic diagrams illustrating a manufacturing process of a partial structure of another kinds of touch display panels according to an embodiment of the present invention, and referring to fig. 9a to 9c, the step of forming a light shielding layer, a touch electrode, and a thin film transistor of a fingerprint identification unit on a package substrate may include:
a gate electrode 363, a gate insulating layer 362, and an active layer 361 of the thin film transistor 36 are formed in this order on the package substrate 20;
forming a light shielding layer 37 and a touch electrode 40;
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious modifications, rearrangements, combinations and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (18)
1, A touch display panel, comprising:
the light emitting device comprises a light emitting unit array substrate and a plurality of light emitting units, wherein the light emitting unit array substrate comprises a substrate and a plurality of light emitting units positioned on the side of the substrate , the light emitting units are arranged in an array along a direction and a second direction which are parallel to the plane of the substrate, and the direction and the second direction are crossed;
a package substrate located on an side of the plurality of light emitting cells away from the substrate;
the light-emitting unit array substrate side of the packaging substrate is provided with at least fingerprint identification units, each fingerprint identification unit comprises a thin film transistor and a light shielding layer, and the vertical projection of the light shielding layer on the packaging substrate covers the vertical projection of the channel region of the thin film transistor on the packaging substrate;
the touch electrode is formed by grid-shaped metal wires and arranged on the same layer as the light shielding layer;
the ratio of the overlapping area of the vertical projection of the grid-shaped metal traces on the package substrate and the vertical projection of the fingerprint identification unit on the package substrate to the area of the vertical projection of the fingerprint identification unit on the package substrate is less than 10%.
2. The touch display panel of claim 1,
the touch display panel comprises an opening area and a non-opening area, each light-emitting unit comprises a plurality of sub-pixel light-emitting areas, the opening area is the area where the sub-pixel light-emitting areas are located, and the touch electrode and/or the fingerprint identification unit are located in the non-opening area.
3. The touch display panel according to claim 1, wherein the touch electrodes comprise a plurality of touch sensing electrodes and a plurality of touch driving electrodes;
the touch sensing electrodes adjacent to each other in columns are connected, the touch driving electrodes adjacent to each other in rows are connected, and the touch driving electrodes in rows are connected through a bridge structure, or,
the touch driving electrodes adjacent to each other in columns are connected, the touch sensing electrodes adjacent to each other in rows are connected, and the touch sensing electrodes in rows are connected through a bridge structure.
4. The touch display panel according to claim 3, wherein the bridge structure is disposed on the same layer as a source/drain or a gate of the thin film transistor.
5. The touch display panel according to claim 3, wherein the touch display panel comprises touch sensing units, the light emitting units correspond to the fingerprint identification unit , the distance between the geometric centers of two adjacent light emitting units is p, the touch sensing units are rectangles, two right-angle sides of each rectangle extend along the row direction and the column direction respectively, the side lengths of the two right-angle sides of each rectangle are a and b, 3.5mm ≤ a ≤ 5.5mm, 3.5mm ≤ b ≤ 5.5mm, the rectangle overlaps the two touch sensing electrodes and the two touch driving electrodes, and each sides of the rectangle passes through the center of the touch sensing electrode or the touch driving electrode, and the rectangle covers N light emitting units, where N satisfies:
6. the touch display panel according to claim 1, wherein the touch electrode comprises a plurality of touch sensing electrodes, and the touch display panel further comprises a plurality of touch driving electrodes disposed in a different layer from the plurality of touch sensing electrodes; or,
the touch control electrode comprises a plurality of touch control driving electrodes, and the touch control display panel further comprises a plurality of touch control sensing electrodes which are arranged in a different layer with the plurality of touch control driving electrodes;
the touch sensing electrodes are insulated and crossed with the touch driving electrodes.
7. The touch display panel according to claim 1, wherein the touch electrode comprises a plurality of self-capacitance touch electrode blocks located on the same layer, and the plurality of self-capacitance touch electrode blocks are arranged in an array.
8. The touch display panel according to claim 1, wherein the thin film transistor comprises an active layer, a gate insulating layer, a gate electrode, and a source drain electrode in this order along a direction in which the thin film transistor is away from the package substrate;
the light shielding layer is located between the thin film transistor and the packaging substrate.
9. The touch display panel according to claim 1, wherein the thin film transistor comprises a gate electrode, a gate insulating layer, an active layer and a source drain electrode in sequence along a direction in which the thin film transistor is away from the package substrate;
the light shielding layer is located on the side of the active layer far away from the packaging substrate.
10. The touch display panel according to claim 1, wherein the light emitting unit serves as a light source of the fingerprint identification unit;
the light emitted by the light-emitting unit is reflected by the touch main body to form reflected light which is incident to the fingerprint identification unit so as to carry out fingerprint identification.
11. The touch display panel according to claim 1, further comprising a fingerprint recognition light source located on the side of the substrate base plate away from the fingerprint recognition unit;
the light emitted by the fingerprint identification light source is reflected by the touch main body to form reflected light to enter the fingerprint identification unit so as to carry out fingerprint identification.
12. The touch display panel of claim 1, wherein the fingerprint identification unit further comprises a photodiode and a storage capacitor, the fingerprint identification unit sequentially comprises a common electrode, a second electrode, a PIN junction and an th electrode along a direction away from the substrate base plate, the second electrode, the th electrode and the PIN form the photodiode, the common electrode is electrically connected with the th electrode, and the second electrode and the common electrode form the storage capacitor.
13. The touch display panel according to claim 12, further comprising a touch electrode line, and the touch electrode line is disposed in the same layer as the gate of the thin film transistor, the source/drain of the thin film transistor, the light shielding layer, or the common electrode.
14. The touch display panel of claim 1,
when fingerprint identification and touch position detection operations are carried out, the touch electrode and the fingerprint identification unit are driven to work simultaneously; or,
when fingerprint identification and touch position detection operations are carried out, the touch electrode and the fingerprint identification unit are driven to work in a time-sharing mode.
15, display device comprising the touch display panel of any one of claims 1-14 through .
16, method of making the touch display panel of any of claims 1-14, comprising:
providing a package substrate;
forming a light shielding layer, a touch electrode and a thin film transistor of a fingerprint identification unit on the packaging substrate, wherein the light shielding layer and the touch electrode are arranged on the same layer, and the vertical projection of the light shielding layer on the packaging substrate covers the vertical projection of a channel region of the thin film transistor on the packaging substrate;
forming a light emitting unit array substrate, wherein the light emitting unit array substrate comprises a substrate and a plurality of light emitting units positioned on the side of the substrate , the plurality of light emitting units are arranged in an array along a direction and a second direction which are parallel to the plane of the substrate, and the direction and the second direction are crossed;
packaging the side of the thin film transistor on which the light-shielding layer, the touch electrode and the fingerprint identification unit are formed on the package substrate and the side of the light-emitting unit array substrate on which the plurality of light-emitting units are formed;
the ratio of the overlapping area of the vertical projection of the grid-shaped metal traces on the package substrate and the vertical projection of the fingerprint identification unit on the package substrate to the area of the vertical projection of the fingerprint identification unit on the package substrate is less than 10%.
17. The method of claim 16, wherein forming a light shielding layer, a touch electrode, and a thin film transistor of a fingerprint identification unit on the package substrate comprises:
forming the light shielding layer and the touch electrode on the packaging substrate;
and sequentially forming an active layer, a gate insulating layer, a gate and a source drain of the thin film transistor.
18. The method of claim 16, wherein forming a light shielding layer, a touch electrode, and a thin film transistor of a fingerprint identification unit on the package substrate comprises:
sequentially forming a gate electrode, a gate insulating layer and an active layer of the thin film transistor on the package substrate;
forming the light shielding layer and the touch electrode;
and forming a source drain electrode of the thin film transistor.
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