Touch display device

Abstract

The present application provides a touch display device, which includes: an organic light emitting diode display panel, the organic light emitting diode display panel includes a support column and a cathode, and part of the cathode is formed on the support column; a touch layer, the touch layer is located on one side of the organic light emitting diode display panel, the touch layer includes an insulating layer and a first conductive layer, a protrusion is provided on the insulating layer, part of the first conductive layer is located on the side of the protrusion away from the cathode, and the orthographic projection of the protrusion on the touch display device and the orthographic projection of the support column on the touch display device at least partially overlap. By providing the protrusion on the insulating layer of the touch layer, the spacing between the cathode on the support column and the first conductive layer on the side of the protrusion on the insulating layer is increased, thereby reducing the parasitic capacitance between the first conductive layer provided on the corresponding support column and the cathode on the support column, and improving the touch reporting rate of the touch display device.

Description

Technical Field

[0001] The present application relates to the field of touch display technology, and in particular to a touch display device. Background Art

[0002] Flexible organic light-emitting diode (OLED) displays have the advantages of active luminescence, large viewing angle, wide color gamut, high brightness, fast response speed, low power consumption and flexible structure. Flexible organic light-emitting diode displays are becoming more and more popular in the market and are gradually replacing liquid crystal displays to become the mainstream display technology.

[0003] Flexible organic light-emitting diode displays are divided into two types according to their light-emitting positions: top-emitting type and bottom-emitting type. At present, top-emitting organic light-emitting diode displays are the mainstream of organic light-emitting diode display mass production technology. Figure 1 As shown, it is a schematic diagram of a conventional flexible organic light-emitting diode display. The conventional flexible organic light-emitting diode display comprises a thin film transistor array (TFT Array) substrate 100, an anode layer 101, a pixel definition layer (PDL) 102, a support column (Photo Spacer, PS) 103, an organic light-emitting layer (Luminescence layer, EL) 104, a cathode layer 105, a thin film encapsulation (Thin Film Encapsulation, TFE) layer 106, and a touch electrode layer 107 located above the thin film encapsulation layer 106, wherein the touch electrode layer comprises a metal grid, and the metal grid is composed of metal wires 1071. Among them, the support columns 103 are dispersedly arranged above the pixel definition layer 102 according to a certain rule to form a plurality of protrusions, and the support columns 103 are located at the gap position of the pixel definition layer openings of adjacent light-emitting sub-pixels. The support column 103 is mainly used for contacting the fine metal mask (FMM) when the substrate formed with the support column 103 contacts the fine metal mask during the evaporation of the organic light-emitting layer, thereby effectively preventing the metal circuits on the substrate from being scratched by the fine metal mask. In addition, since the cathode 105 is evaporated on the entire surface, the distance between the cathode 105 on the support column 103 and the touch electrode located on the surface of the thin film encapsulation layer 106 is closer than the distance between the cathode 105 on the upper surface of the pixel definition layer 102 and the touch electrode located on the surface of the thin film encapsulation layer 106, resulting in a larger parasitic capacitance of the touch electrode directly above the support column 103, thereby affecting the touch sensitivity and other performance of this area.

[0004] Therefore, it is necessary to propose a technical solution to solve the problem that the small distance between the cathode and the touch electrode on the support column leads to a large parasitic capacitance and affects the performance such as touch sensitivity. Summary of the invention

[0005] The purpose of the present application is to provide a touch display device to solve the problem that the small distance between the cathode and the touch electrode on the support column leads to a large parasitic capacitance and affects the performance such as touch sensitivity.

[0006] To achieve the above object, the present application provides a touch display device, the touch display device comprising:

[0007] An organic light emitting diode display panel, the organic light emitting diode display panel comprising a support column and a cathode, wherein a portion of the cathode is formed on the support column;

[0008] A touch layer, the touch layer is located on one side of the organic light-emitting diode display panel, the touch layer includes an insulating layer and a first conductive layer, a protrusion is provided on the insulating layer, a portion of the first conductive layer is located on a side of the protrusion away from the cathode, and an orthographic projection of the protrusion on the touch display device at least partially overlaps with an orthographic projection of the support column on the touch display device.

[0009] In the above touch display device, the organic light emitting diode display panel further includes a pixel definition layer, the support column is disposed on the pixel definition layer, a portion of the cathode is formed on the pixel definition layer, and a portion of the first conductive layer is formed on the insulating layer.

[0010] The distance between the cathode formed on the pixel definition layer and the corresponding first conductive layer is equal to the distance between the cathode formed on the support column and the first conductive layer arranged on the side of the protrusion away from the cathode.

[0011] In the above touch display device, the height of the protrusion is equal to the height of the supporting column.

[0012] In the above touch display device, the touch layer also includes a second conductive layer, the insulating layer is located between the first conductive layer and the second conductive layer, the second conductive layer includes a bridging line, and the orthographic projection of the bridging line on the touch display device is staggered from the orthographic projection of the support column on the touch display device.

[0013] In the above touch display device, the first conductive layer includes a first electrode and a second electrode, the first electrode is electrically insulated from the second electrode, two adjacent first electrodes are formed continuously, two adjacent second electrodes are electrically connected through the bridge line, and each second electrode is electrically connected to the bridge line through a first via hole on the insulating layer.

[0014] In the above touch display device, the first conductive layer further includes a first conductive line and a second conductive line, the second conductive layer further includes a third conductive line and a fourth conductive line,

[0015] The third wire is electrically connected to the first wire one-to-one, and the third wire is electrically connected to a portion of the first electrode through a second via hole on the insulating layer;

[0016] The fourth wire is electrically connected to the second wire in a one-to-one manner, and the fourth wire is electrically connected to a portion of the second electrode through a third via hole on the insulating layer.

[0017] In the above touch display device, the orthographic projection of the support column on the touch display device is located within the orthographic projection of the protrusion on the touch display device, or the orthographic projection of the support column on the touch display device completely overlaps with the orthographic projection of the protrusion on the touch display device.

[0018] In the above touch display device, the insulating layer includes at least one of an inorganic insulating layer and an organic insulating layer.

[0019] In the above touch display device, the organic light emitting diode display panel includes a plurality of sub-pixels, and the supporting column is disposed between two adjacent sub-pixels.

[0020] In the above touch display device, the organic light emitting diode display panel includes an encapsulation layer, and the encapsulation layer is arranged between the cathode and the touch layer.

[0021] Beneficial effects: The present application provides a touch display device, which includes: an organic light-emitting diode display panel, the organic light-emitting diode display panel includes a support column and a cathode, and part of the cathode is formed on the support column; a touch layer, the touch layer is located on one side of the organic light-emitting diode display panel, the touch layer includes an insulating layer and a first conductive layer, a protrusion is provided on the insulating layer, part of the first conductive layer is located on the side of the protrusion away from the cathode, and the orthographic projection of the protrusion on the touch display device and the orthographic projection of the support column on the touch display device at least partially overlap. By providing the protrusion on the insulating layer of the touch layer, the distance between the cathode on the support column and the first conductive layer on the side of the protrusion on the insulating layer is increased, thereby reducing the parasitic capacitance between the first conductive layer provided on the corresponding support column and the cathode on the support column, and improving the touch reporting rate of the touch display device. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic diagram of a conventional flexible organic light emitting diode display;

[0023] Figure 2A schematic cross-sectional view of the touch display device of the present application;

[0024] Figure 3 for Figure 2 A schematic cross-sectional view of a touch layer of the touch display device shown;

[0025] Figure 4 This is a schematic diagram of the metal grid surrounding the sub-pixel arrangement and the distribution of the support columns of this application;

[0026] Figures 5A-5C A schematic diagram of the process of forming the touch layer of the present application. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0028] See also Figure 2 , which is a cross-sectional schematic diagram of the touch display device of the present application. The touch display device includes an organic light emitting diode display panel 20 and a touch layer 30. The organic light emitting diode display panel 20 can be a flexible organic light emitting diode display panel or a rigid organic light emitting diode display panel. The touch layer 30 is located on one side of the organic light emitting diode display panel 20. Specifically, the touch layer 30 is located on the light emitting side of the organic light emitting diode display panel 20.

[0029] The organic light emitting diode display panel 20 includes a substrate 200 , a thin film transistor array layer, an organic light emitting diode array layer and an encapsulation layer 203 .

[0030] The thin film transistor array layer includes a plurality of thin film transistors arranged in an array. The thin film transistor array layer includes an active layer 2011, a gate insulating layer 2012, a gate 2013, a first insulating layer 2014, a patterned metal member 2015, a second insulating layer 2016, source and drain electrodes (20171, 20172), a planarization layer 2018, a pixel definition layer 2019, and a support column 2020.

[0031] The active layer 2011 is disposed on the substrate 200. The active layer 2011 is made of polysilicon. The gate insulating layer 2012 covers the active layer 2011 and the substrate 200. The gate insulating layer 2012 is made of at least one of silicon nitride and silicon oxide. The thickness of the gate insulating layer 2012 is 800 angstroms to 1200 angstroms. The gate 2013 is disposed on the gate insulating layer 2012 and corresponds to the active layer 2011. The gate 2013 is made of at least one of molybdenum, aluminum, titanium and copper. The first insulating layer 2014 covers the gate 2013 and the gate insulating layer 2012. The first insulating layer 2014 is made of at least one of silicon nitride and silicon oxide. The patterned metal component 2015 is disposed on the first insulating layer 2014 and is disposed corresponding to the gate 2013. The patterned metal component 2015 and the gate 2013 form a capacitor. The orthographic projection of the patterned metal component 2015 on the touch display device 40 completely overlaps with the orthographic projection of the gate 2013 on the touch display device 40. The material of the patterned metal component 2015 is the same as that of the gate 2013. The second insulating layer 2016 covers the patterned metal component 2015 and the first insulating layer 2014. The source-drain electrodes (20171, 20172) include a source electrode 20171 and a drain electrode 20172, which are disposed on the second insulating layer 2016, and the source electrode 20171 and the drain electrode 20172 are in contact with the active layer 2011 through vias penetrating the first insulating layer 2014, the second insulating layer 2016 and the gate insulating layer 2012, and the source electrode 20171 and the drain electrode 20172 are symmetrically disposed on opposite sides of the gate 2013. The planarization layer 2018 covers the source-drain electrodes (20171, 20172) and the second insulating layer 2016, and the planarization layer 2018 is an organic insulating layer, and the thickness of the planarization layer 2018 is 0.8 micrometers to 2.5 micrometers. A plurality of independent anodes are formed on the planarization layer 2018. The pixel definition layer 2019 covers a plurality of independent anodes 2021 and the planarization layer 2018. The pixel definition layer 2019 is provided with a plurality of openings corresponding to the plurality of independent anodes 2021. The longitudinal section of the opening is an inverted trapezoid. The pixel definition layer 2019 is an organic insulating layer. The thickness of the pixel definition layer 2019 is 0.8 micrometers to 2.5 micrometers, for example, 2 micrometers.

[0032] The support column 2020 is disposed on the pixel definition layer 2019 and is located between two adjacent openings of the pixel definition layer 2019. The support column 2020 is used to support the fine mask in the process of evaporating the organic light-emitting layer into the opening. The support column 2020 and the pixel definition layer 2019 can be prepared by a process, for example, using the same half-tone mask combined with a yellow light process. The longitudinal section of the support column 2020 is a trapezoid, and the cross section of the support column 2020 is a circle. The height of the support column 2020 is 0.8 microseconds to 1.2 microseconds, for example, 1 micron.

[0033] The organic light emitting diode array layer 202 includes organic light emitting diodes arranged in an array. The organic light emitting diode array layer includes a plurality of independent anodes 2021, an organic light emitting layer 2022 disposed on each anode 2021 and located in an opening, and a cathode 2023. A plurality of organic light emitting diodes share one cathode, and the cathode 2023 is formed by evaporation over the entire surface. Part of the cathode 2023 is formed on the support column 2020, part of the cathode 2023 is formed on the organic light emitting layer 2022, and part of the cathode 2023 is formed on the pixel definition layer 2019.

[0034] The encapsulation layer 203 is disposed between the cathode 2023 and the touch layer 30. The encapsulation layer 203 is a thin film encapsulation layer. The thickness of the encapsulation layer 203 is 6 micrometers to 14 micrometers, for example, 10 micrometers. The encapsulation layer 203 is used to prevent the cathode 2023 and the organic light-emitting layer 2022 from being corroded by oxygen or water vapor.

[0035] like Figure 3 As shown, it is Figure 2 The touch layer of the touch display device is shown in FIG. The touch layer includes a buffer layer 301 , a second conductive layer 302 , a first passivation layer 303 , a first conductive layer 304 and a second passivation layer 305 .

[0036] The buffer layer 301 is disposed on the encapsulation layer 203. The buffer layer 301 is made of at least one material selected from silicon nitride and silicon oxide.

[0037] The second conductive layer 302 is disposed on the buffer layer 301. The second conductive layer 302 includes a bridge line 3021. The bridge line 3021 is composed of a metal wire. The bridge line 3021 is distributed according to a certain rule. The orthographic projection of the bridge line 3021 on the touch display device is staggered with the orthographic projection of the support column 2020 on the touch display device to avoid the formation of parasitic capacitance between the bridge line 3021 and the cathode 2023 on the support column 2020, thereby improving the touch reporting rate and touch sensitivity.

[0038] The first passivation layer 303 is an insulating layer. The first passivation layer 303 is located between the first conductive layer 304 and the second conductive layer 302. The first passivation layer 302 includes at least one of an organic insulating layer or an inorganic insulating layer. Specifically, the first passivation layer 302 includes an organic insulating layer, and the thickness of the organic insulating layer is 0.8 micrometers to 1.2 micrometers, for example, 1 micrometer.

[0039] A protrusion 3031 is provided on the first passivation layer 303, a portion of the first conductive layer 304 is formed on the side of the protrusion 3031 away from the cathode 2023, and a portion of the first conductive layer 304 is formed on the first passivation layer 303. The protrusion 3031 and the first passivation layer 303 can be prepared by the same process. The orthographic projection of the protrusion 3031 on the touch display device and the orthographic projection of the support column 2020 on the touch display device at least partially overlap, so as to increase the distance between the cathode 2023 formed on the support column 2020 and the first conductive layer 304 formed on the side of the protrusion 3031 away from the cathode 2023, thereby reducing the parasitic capacitance between the first conductive layer 304 on the protrusion 3031 and the cathode 2023 formed on the support column 2020, and improving the touch reporting rate.

[0040] It should be noted that the orthographic projection of the protrusion 3031 on the touch display device at least partially overlaps with the orthographic projection of the support column 2020 on the touch display device, and the "at least partially overlap" means that at least a portion of the "orthographic projection of the protrusion 3031 on the touch display device" and at least a portion of the "orthographic projection of the support column 2020 on the touch display device" are at the same position on the same two-dimensional plane and have the same shape and size. The orthographic projections "completely overlap" and "completely overlap" in the following text mean that the positions, shapes and sizes of the projections are exactly the same.

[0041] In this embodiment, the distance between the cathode 2023 formed on the pixel definition layer 2019 and the corresponding first conductive layer 304 (the first conductive layer 304 on the first passivation layer 303) is equal to the distance between the cathode 2023 formed on the support column 2020 and the first conductive layer 304 arranged on the protrusion 3031. By making the distance between the cathode at the position of the pixel definition layer 2019 where the support column 2020 is not set and the corresponding first conductive layer 304 equal to the distance between the cathode on the support column 2020 and the first conductive layer 304 on the protrusion 3031, the distance between the first conductive layer 304 and the cathode 2023 at different positions is made the same, thereby avoiding touch noise caused by different parasitic capacitances and improving touch performance.

[0042] Specifically, the height of the protrusion 3031 is equal to the height of the support column 2020, so that the distance between the cathode 2023 and the first conductive layer 304 at the position of the pixel definition layer 2019 where the support column 2020 is not set is equal to the distance between the cathode 2023 on the support column 2020 and the first conductive layer 304 on the protrusion 3031.

[0043] The orthographic projection of the support column 2020 on the touch display device is located within the orthographic projection of the protrusion 3031 on the touch display device, or the orthographic projection of the support column 2020 on the touch display device completely overlaps with the orthographic projection of the protrusion 3031 on the touch display device, so that the distance from the first conductive layer 304 set corresponding to the support column 2020 to the cathode 2023 on the support column 2020 is increased.

[0044] In this embodiment, the first conductive layer 304 includes a first electrode 3041 and a second electrode 3042, the first electrode 3041 is electrically insulated from the second electrode 3042, two adjacent first electrodes 3041 are formed continuously, two adjacent second electrodes 3042 are electrically connected through a bridge line 302, and each second electrode 3042 is electrically connected to the bridge line 302 through a first via 303a on the first passivation layer 303.

[0045] The second passivation layer 305 covers the first conductive layer 304 and the first passivation layer 303. The second passivation layer 305 is an insulating layer.

[0046] In this embodiment, the first electrode 3041, the second electrode 3042 and the bridge line 3021 are all composed of a metal grid. The metal grid is composed of metal wires. The first electrode 3041, the second electrode 3042 and the bridge line 3021 are arranged corresponding to the display area of ​​the organic light emitting diode display panel.

[0047] like Figure 4 As shown, it is a schematic diagram of the distribution of the metal grid surrounding the sub-pixel setting and the support column of the present application. The organic light-emitting diode display panel includes multiple sub-pixels, and the touch layer includes multiple metal grids, each of which is arranged around a sub-pixel to prevent the metal line from blocking the light emitted by the sub-pixel. The support column 2020 is arranged between two adjacent sub-pixels, and the interval between two adjacent support columns 2020 is 2 sub-pixels, 4 sub-pixels or 8 sub-pixels. The multiple metal grids include rectangular metal grids and diamond metal grids. The sub-pixels include diamond sub-pixels.

[0048] like Figures 5A-5C As shown, it is a schematic diagram of the process of forming the touch layer of the present application. The steps of forming the touch layer include:

[0049] S100: First, a second metal layer such as Ti / Al / Ti, or other metals such as Mo / Cu / Ag and their alloys is formed on the entire surface by physical vapor deposition, and the second metal layer is patterned by yellow light etching (dry etching) process to form a bridge line (Bridge) 3021, a third wire 3022 and a fourth wire 3023, as shown in 5A.

[0050] S101: Secondly, a first passivation layer 303 covering the bridge line 3021, the third wire 3022 and the fourth wire 3023 is formed, and the first passivation layer is patterned by yellow light etching (dry etching) process, and a first via hole 303a is formed at the end point of the bridge line 3021 and a corresponding second via hole 303b and a third via hole 303c are formed at the end of the touch electrode channel, wherein the second via hole 303b is arranged corresponding to the third wire 3022, and the third via hole 303c is arranged corresponding to the fourth wire 3023, such as Figure 5B As shown, a portion of the via holes on the first passivation layer 303 is disposed directly above the third conductive line 3022 .

[0051] S102: Forming a first metal layer on the entire surface of the first passivation layer by physical vapor deposition, the first metal layer is Ti / Al / Ti, or other metals such as Mo / Cu / Ag and their alloys. Patterning the first metal layer by yellow light etching (dry etching) process to form a first electrode 3041 (sensing electrode, RX) that is continuously conductive in the horizontal direction and a second electrode 3042 (driving electrode, TX) that is isolated in the vertical direction. The isolated second electrode 3042 is electrically connected to the bridge line 3021 below through the first via 303a, thereby forming a second electrode 3042 that is continuously conductive in the vertical direction. Figure 5C As shown. In this step, the third wire 3022 is electrically connected to a portion of the first electrode 3041 through the second via 303b on the first passivation layer 303. The fourth wire 3023 is electrically connected to a portion of the second electrode 3042 through the third via 303c on the first passivation layer 303. At the same time, a first wire connected to the first electrode 3041 and a second wire connected to the second electrode 3042 are formed, the orthographic projection of the first wire on the touch layer completely overlaps with the orthographic projection of the third wire 3022 on the touch layer, and the first wire is electrically connected to the third wire one-to-one, and the orthographic projection of the second wire on the touch layer completely overlaps with the orthographic projection of the fourth wire 3023 on the touch layer and is electrically connected to the fourth wire one-to-one, so as to reduce the impedance of the peripheral routing connected to the first electrode 3041 and the second electrode 3042. The first wire can be electrically connected to the third wire through the second via 303b, or it can be electrically connected to the first wire through a via located directly above the third wire 3022 and arranged on the first passivation layer 303.

[0052] The description of the above embodiments is only used to help understand the technical solutions and core ideas of the present application. Ordinary technical personnel in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A touch display device, characterized in that: The touch display device comprises: An organic light emitting diode display panel, the organic light emitting diode display panel comprising a substrate, a support column, a pixel definition layer and a cathode, the pixel definition layer is arranged on the substrate, the support column is arranged on the pixel definition layer, part of the cathode is formed on the support column, and part of the cathode is formed on the pixel definition layer; A touch layer, the touch layer is located at the light-emitting side of the organic light-emitting diode display panel, the touch layer includes an insulating layer, a first conductive layer and a second conductive layer, the insulating layer is located between the first conductive layer and the second conductive layer, a protrusion is provided on the insulating layer, a portion of the first conductive layer is formed on the insulating layer, a portion of the first conductive layer is located on a side of the protrusion away from the cathode, and an orthographic projection of the protrusion on the substrate at least partially overlaps with an orthographic projection of the support column on the substrate; The second conductive layer includes a bridge line, and an orthographic projection of the bridge line on the substrate is offset from an orthographic projection of the support column on the substrate.

2. The touch display device according to claim 1, characterized in that: The distance between the cathode formed on the pixel definition layer and the corresponding first conductive layer is equal to the distance between the cathode formed on the support column and the first conductive layer arranged on the side of the protrusion away from the cathode.

3. The touch display device according to claim 1 or 2, characterized in that: The height of the protrusion is equal to the height of the supporting column.

4. The touch display device according to claim 1, characterized in that: The height of the support column is 0.8 micrometers to 1.2 micrometers.

5. The touch display device according to claim 1, characterized in that: The first conductive layer includes a first electrode and a second electrode, the first electrode is electrically insulated from the second electrode, two adjacent first electrodes are formed continuously, two adjacent second electrodes are electrically connected through the bridge line, and each second electrode is electrically connected to the bridge line through a first via on the insulating layer.

6. The touch display device according to claim 5, characterized in that: The first conductive layer further includes a first conductive line and a second conductive line, and the second conductive layer further includes a third conductive line and a fourth conductive line. The third wire is electrically connected to the first wire one-to-one, and the third wire is electrically connected to a portion of the first electrode through a second via hole on the insulating layer; The fourth wire is electrically connected to the second wire in a one-to-one manner, and the fourth wire is electrically connected to a portion of the second electrode through a third via hole on the insulating layer.

7. The touch display device according to claim 1, characterized in that: The orthographic projection of the support column on the substrate is located within the orthographic projection of the protrusion on the substrate, or the orthographic projection of the support column on the substrate completely overlaps with the orthographic projection of the protrusion on the substrate.

8. The touch display device according to claim 1, characterized in that: The insulating layer includes at least one of an inorganic insulating layer or an organic insulating layer.

9. The touch display device according to claim 1, characterized in that: The organic light emitting diode display panel includes a plurality of sub-pixels, and the supporting column is arranged between two adjacent sub-pixels.

10. The touch display device according to claim 1, characterized in that: The organic light emitting diode display panel includes an encapsulation layer, and the encapsulation layer is arranged between the cathode and the touch control layer.

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