CN114078401A - Touch control integrated Micro-LED display panel - Google Patents
Touch control integrated Micro-LED display panel Download PDFInfo
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- CN114078401A CN114078401A CN202111336879.3A CN202111336879A CN114078401A CN 114078401 A CN114078401 A CN 114078401A CN 202111336879 A CN202111336879 A CN 202111336879A CN 114078401 A CN114078401 A CN 114078401A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/33—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being semiconductor devices, e.g. diodes
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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
Abstract
The invention provides a touch integrated Micro-LED display panel, which comprises an array substrate and a Micro-LED chip positioned on the array substrate; a touch layer is arranged in the array substrate and is prepared on the same layer as the metal layer of the thin film transistor in the array substrate, wherein the touch layer and the display driving wire of the array substrate are connected with the same driving control chip; according to the invention, the touch layer is arranged in the array substrate, so that the thickness and the manufacturing cost of the display panel can be effectively reduced, and the use comfort is improved.
Description
Technical Field
The application relates to the technical field of display, in particular to a touch integrated Micro-LED display panel.
Background
The Micro-LED panel is a comprehensive technology of composite integration of a novel display technology and a Light Emitting Diode (LED) technology because of the micron-sized semiconductor light emitting unit array, and is considered to be one of the most promising next-generation novel display and light emitting devices because of the characteristics of high flexibility, self-luminescence, high efficiency, low power consumption, high integration, high stability, easy disassembly and combination and the like of the Micro-LED chip.
The Touch panel is used as a medium for human-computer interaction and plays a crucial role in the display technology, and the existing DOT Touch (capacitive Touch technology) scheme mainly comprises types of resistance and capacitance, wherein the capacitive Touch screen is widely applied. At present, a touch layer is formed on the light emitting side of the display panel to realize detection of a touch position and touch pressure, but the thickness of the display panel is undoubtedly increased by the scheme, and the ultra-thin development trend of the Micro-LED display panel is not met.
Therefore, a novel touch integrated Micro-LED display panel is needed to be provided to solve the technical problems that the thickness and manufacturing cost of the display panel are increased and the use comfort level is reduced by overlapping a touch layer on the surface of the display panel in the existing touch display panel.
Disclosure of Invention
The application provides a novel touch integrated Micro-LED display panel according to the prior art, and the touch integrated Micro-LED display panel integrates the touch function in the Micro-LED display panel, so that the manufacturing cost and the screen thickness are effectively reduced, and the use comfort level is improved.
The embodiment of the invention provides a touch integrated Micro-LED display panel, which comprises an array substrate and a Micro-LED chip positioned on the array substrate.
The array substrate is internally provided with a touch layer, the touch layer and a metal layer of a thin film transistor in the array substrate are prepared on the same layer, and the touch layer and a display driving wire of the array substrate are connected with the same driving control chip.
According to a preferred embodiment of the present invention, the touch layer includes a touch sensor layer and the touch routing layer electrically connected to the touch sensor layer.
The array substrate at least comprises a substrate, an active layer positioned on the substrate, a grid positioned on the active layer, a source/drain layer positioned on the grid, a touch routing layer positioned on the source/drain layer, and a touch sensor layer positioned on the touch routing layer.
According to a preferred embodiment of the present invention, the touch sensor layer is divided into a plurality of touch units along the longitudinal and transverse directions, and each touch unit is electrically connected to one touch trace.
According to a preferred embodiment of the present invention, a bonding electrode layer electrically connected to the Micro-LED chip is further disposed above the touch sensor layer.
According to a preferred embodiment of the present invention, the touch layer includes a transmitting electrode layer and a receiving electrode layer, which are disposed in a cross manner, wherein the transmitting electrode layer is electrically connected to one of the touch traces, and the receiving electrode layer is electrically connected to the other of the touch traces.
According to a preferred embodiment of the present invention, the transmitting electrode layer comprises transmitting electrodes arranged along a longitudinal array, the receiving electrode layer comprises receiving electrodes arranged along a transverse array, and the transmitting electrodes and the receiving electrodes are electrically connected at the cross points of different layers.
According to a preferred embodiment of the present invention, the bending region of the touch integrated Micro-LED display panel further includes a flexible circuit board and the driving control chip, and the touch trace is electrically connected to the driving control chip through the flexible circuit board; or, the touch routing is directly electrically connected with the driving control chip.
According to a preferred embodiment of the present invention, the projection of the touch trace on the touch integrated Micro-LED display panel is not overlapped with the light emitting point of the Micro-LED chip, and the touch trace includes a single film layer of silver, copper, aluminum, molybdenum, and titanium or a combined film layer of multiple materials.
According to a preferred embodiment of the present invention, a protection layer is further disposed on the surface of the lap electrode layer, an opening is disposed at a position of the protection layer corresponding to the Micro-LED chip, and the pin of the Micro-LED chip is filled in the opening and electrically connected to the lap electrode layer.
According to a preferred embodiment of the present invention, the driving control chip is a TDDI touch and display integrated driver.
The invention has the beneficial effects that: the embodiment of the invention provides a touch integrated Micro-LED display panel, which comprises an array substrate and a Micro-LED chip positioned on the array substrate; the array substrate is internally provided with a touch layer, the touch layer and a metal layer of a thin film transistor in the array substrate are prepared on the same layer, wherein the touch layer and a display driving wire of the array substrate are connected with the same driving control chip, and the touch layer is arranged inside the array substrate in the embodiment, so that the thickness and the manufacturing cost of the display panel can be effectively reduced, and the use comfort level is improved.
Drawings
In order to illustrate the embodiments or the technical solutions in the prior art more clearly, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the invention, and it is obvious for a person skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a touch display panel in the prior art.
Fig. 2 is a schematic structural view of a touch integrated Micro-LED display panel according to an embodiment of the present invention.
Fig. 3 is another schematic structural diagram of a touch integrated Micro-LED display panel according to an embodiment of the present invention.
Fig. 4 is a schematic diagram of a film structure of a touch integrated Micro-LED display panel according to an embodiment of the present invention.
Fig. 5 is a schematic diagram of a self-contained touch structure of a touch integrated Micro-LED display panel according to an embodiment of the present invention.
Fig. 6 is a schematic diagram of another self-contained touch structure of a touch integrated Micro-LED display panel according to an embodiment of the invention.
Fig. 7 is a schematic diagram of a mutual capacitance type touch structure of a touch integrated Micro-LED display panel according to an embodiment of the present invention.
Fig. 8 is a schematic view of another mutual capacitance type touch structure of a touch integrated Micro-LED display panel according to an embodiment of the present invention.
Fig. 9 and 10 are schematic timing design diagrams of a touch integrated Micro-LED display panel according to an embodiment of the invention.
Detailed Description
The following description of the various embodiments refers to the accompanying drawings that illustrate specific embodiments in which the invention may be practiced. The directional terms mentioned in the present invention, such as [ upper ], [ lower ], [ front ], [ rear ], [ left ], [ right ], [ inner ], [ outer ], [ side ], are only referring to the directions of the attached drawings. Accordingly, the directional terms used are used for explanation and understanding of the present invention, and are not used for limiting the present invention. In the drawings, elements having similar structures are denoted by the same reference numerals, and broken lines in the drawings indicate that the elements do not exist in the structures, and only the shapes and positions of the structures are explained.
As shown in fig. 1, the existing Touch display panel is formed by stacking a display panel 10 and a Touch panel 20, the display panel 10 employs a driving module 11, the Touch panel 20 employs a circuit board 21 and a Touch chip 22 attached to the circuit board 21, the two independent driving modules employ two sets of driving modules, dense display driving signal lines and Touch traces are distributed on the Touch display panel formed by stacking, in addition, the existing known Micro-LED chips have small volume and are driven individually, the required driving chips and metal signal lines are denser than those in the OLED panel, if the DOT Touch technology is employed, signal lines of the Micro-LED chips are prone to generate signal crosstalk with a capacitive Touch signal line layer, and the Micro-LED display panel is an ultra-thin flexible display panel, so the existing OLED DOT Touch technology scheme is no longer suitable for the Micro-LED display panel, by adopting the mode of externally hanging the touch screen, the cost is increased, the thickness of the screen is increased, and the use comfort is reduced. Aiming at the technical problems, the touch control function is integrated in the driving circuit layer of the Micro-LED display panel, so that the defect is overcome.
Fig. 2 and fig. 3 show two touch signal transmission modes of the touch integrated Micro-LED display panel 100 according to the present invention, which has a simple touch detection method, reduces the manufacturing cost of the touch display panel, and can meet the requirement of the flexible touch panel for being light and thin. As shown in fig. 2, an embodiment of the invention provides a schematic structural diagram of a touch integrated Micro-LED display panel 100. The touch integrated Micro-LED display panel 100 adopts a flexible circuit board 1001 and a driving control chip 1002 to transmit driving signals, the driving control chip 1002 is attached to the flexible circuit board 1001, the driving control chip 1002 comprises display driving signals and touch driving signals, and the display driving signals at least comprise grid driving signals, electrostatic protection circuit signals and source driving signals. The driving control chip 1002 outputs a display driving signal and a touch driving signal, and the display driving signal and the touch driving signal are transmitted to the touch integrated Micro-LED display panel 100 through the flexible circuit 1001, and the touch driving signal fed back by the Micro-LED display panel is also transmitted to the driving control chip 1002 through the flexible circuit 1001. The driving control chip 1002 of the present embodiment is preferably a TDDI touch and display integrated driver. As shown in fig. 3, the touch integrated Micro-LED display panel 100 uses a flexible circuit board 1001 and a driving control chip 1002 for transmitting driving signals, the driving control chip 1002 and the flexible circuit board 1001 are separately disposed, the driving control chip 1002 includes a display driving signal and a touch driving signal, and the display driving signal at least includes a gate driving signal, an electrostatic protection circuit signal, and a source driving signal. The driving control chip 1002 outputs a display driving signal and a touch driving signal, which are transmitted to the touch integrated Micro-LED display panel 100 through the flexible circuit board 1001. Touch driving signals fed back by the Micro-LED display panel are directly transmitted to the driving control chip 1002 without passing through the flexible circuit board 1001. The driving control chip 1002 of the present embodiment is also preferably a TDDI touch and display integrated driver.
As shown in fig. 4, an embodiment of the invention provides a schematic structural diagram of a touch integrated Micro-LED display panel 100. The touch integrated Micro-LED display panel 100 comprises an array substrate and a Micro-LED chip 118 located on the array substrate; the array substrate is internally provided with a touch layer, the touch layer and a metal layer of a thin film transistor substrate in the array substrate are prepared on the same layer, and the touch layer and a display driving wire of the array substrate are connected with the same driving control chip.
The touch layer 112 includes a touch sensor layer 1122 and the touch routing layer 1121 electrically connected to the touch sensor layer 1122, wherein the array substrate includes at least a substrate 101, an active layer 103 on the substrate 101, a gate electrode on the active layer 103, a source/drain layer on the gate electrode, the touch routing layer 1121 on the source/drain layer, and the touch sensor layer 1122 on the touch routing layer 1121. The projection of the touch trace in the touch sensor layer 1122 on the touch integrated Micro-LED display panel 100 does not overlap with the light emitting point of the Micro-LED chip 118, and the touch trace includes a single or multiple film layers of silver, copper, aluminum, molybdenum, and titanium. In the embodiment, the touch layer 112 is disposed inside the array substrate, so that the thickness and the manufacturing cost of the display panel can be effectively reduced, and the use comfort is improved.
Specifically, the substrate 101 of this embodiment includes a first flexible layer, a first water blocking layer, a second flexible layer, and a second water blocking layer, which are stacked, where the first flexible layer and the second flexible layer are both made of a transparent PI material, and the first water blocking layer and the second water blocking layer are both made of a silicon dioxide or silicon nitride film. A buffer layer 102 is prepared on the surface of the substrate 101, and the buffer layer 102 is a silicon oxide film, a silicon nitride film, or a composite film formed by alternately laminating a silicon oxide film and a silicon nitride film. Preparing an active layer 103 on the surface of a buffer layer 102, wherein the active layer 103 is made of one or more materials selected from indium gallium zinc oxide, indium zinc tin oxide and indium gallium zinc tin oxide, preparing a first gate electrode 105 on the active layer 103, preparing a second gate electrode 106 on the first gate electrode 105, the first gate electrode 105 and the second gate electrode 106 are made of metal materials such as copper (Cu), aluminum (Al), titanium (Ti), tantalum (Ta), tungsten (W), molybdenum (Mo), chromium (Cr) and the like, preparing an interlayer insulating layer 104 on the surface of the buffer layer 102, wherein the interlayer insulating layer 104 is generally an insulating polymer flexible material, the interlayer insulating layer 104 covers the active layer 103, the first gate electrode 105 and the second gate electrode 106, and preparing a source electrode 107, a drain electrode 108 and a first planarization layer 109 covering the source electrode 107 and the drain electrode 108 on the interlayer insulating layer 104.
Preparing a touch wiring layer 1121 and a first metal layer 111 electrically connected with a drain electrode 108 on a first planarization layer 109, preparing a second planarization layer 113 on the first metal layer 111 and the touch wiring layer 1121, preparing a touch sensor layer 1122 electrically connected with the touch wiring layer 1121 and a second metal layer 114 electrically connected with the first metal layer 111 on the second planarization layer 113, preparing a passivation layer 115 on the touch sensor layer 1122 and the second metal layer 114, preparing a landing electrode layer 116 on the passivation layer 115, preparing a protection layer 117 on the landing electrode layer 116, wherein an opening is formed in the protection layer 117 corresponding to the position of the Micro-LED chip 118, and a pin 1181 and a pin 1182 of the Micro-LED chip 118 are filled in the opening and are respectively electrically connected with a positive potential output terminal 1161 and a negative potential output terminal 1162 in the landing electrode layer 116. The positive potential output terminal 1161 is electrically connected to the drain electrode 108 through the second metal layer 114 and the first metal layer 111, and the negative potential output terminal 1162 is electrically connected to a negative electrode of an external power source. The touch sensor layer 1122 in other embodiments may also be disposed on the same layer as the metal film layer of the tft, and is not limited to be on the same layer as the second metal layer 114.
Corresponding to the touch function, the invention adopts two modes of self-capacitance type touch integrated Micro-LED display design and mutual capacitance type touch integrated Micro-LED display design. The detailed self-contained touch integrated Micro-LED display design is as follows:
as shown in fig. 4 in conjunction with fig. 5, the touch sensor layer 1122 is preferably a single layer of sensing capacitor structure. The touch sensor layer 1122 is divided into a plurality of touch units 1124 along the longitudinal and lateral directions, and each touch unit 1124 is electrically connected to one touch trace 1123. The touch unit 1124 of this embodiment is implemented by the driving control chip 1002 transmitting a signal and the driving control chip 1002 receiving a signal, the size of the touch unit 1124 is determined by the size of the display area of the display panel, and the touch trace 1123 guides the signal of the touch unit 1124 of the display area to the driving control chip 1002 to form a path for sensing the variation of the capacitance. The touch routing connects the connection terminals of the touch units 1124 in the display area through via holes, and the via holes on the connection terminals of different touch units 1124 are located at different positions, so that signals of the connection terminals of different touch units 1124 are respectively transmitted. When a finger touches or presses the touch unit 1124, the touch unit 1124 is polarized due to deformation, so that the capacitance between the finger and the sensing electrode layer changes, and thus the touch sensing signal generated by the touch unit 1124 changes, and the position of the touch unit 1124 where the touch sensing signal changes and the variation of the touch sensing signal are determined row by row or row by row, so that the detection of the touch position and the touch pressure can be realized.
The m × n touch units 1124 in the touch sensor layer 1122 are named sequentially, namely, a first row of sensing capacitor units, line 1-1, line 1-2, …, line1-n, a second row of sensing capacitor units, line 2-1, line 2-2, …, line2-n, …, an m-th row of sensing capacitor units, line m-1, line m-2, …, and line-n; similarly, the first column of sensing capacitor units line 1-1, line 2-1, …, line-1, the second column of sensing capacitor units, line 1-2, line 2-2, …, line3-2, …, line-2, …, the nth column of sensing capacitor units, line1-n, line2-n, … and line m-n. Each touch unit 1124 is connected to one touch trace 1023, and as long as the charge amount on any one touch unit 1124 changes, the touch trace 1023 detects the change of current/voltage/capacitance, and transmits the changed current/voltage/capacitance signal to the flexible circuit board 1001 and then to the control chip 1002, so as to determine the touch position.
As shown in fig. 4 and fig. 6, the structure of the touch integrated Micro-LED display panel 100 of the present embodiment is similar to that of fig. 5, and the driving manner is different, in this embodiment, each touch unit 1124 is connected to one touch trace 1123, so that as long as the charge amount on any one touch unit 1124 changes, the touch trace 1023 detects the change of current/voltage/capacitance, and directly transmits the changed current/voltage/capacitance signal to the driving control chip 1002, so as to determine the touch position.
And corresponding touch control function, the invention adopts a mutual capacitance type touch control integrated Micro-LED display design mode. The detailed mutual-capacitance touch integrated Micro-LED display design is as follows:
as shown in fig. 7, the touch layer 112 of the present embodiment includes a transmitting electrode layer and a receiving electrode layer, which are arranged in a cross manner and are different from each other, the transmitting electrode layer is electrically connected to one touch trace 1127, and the receiving electrode layer is electrically connected to another touch trace 1128. The emitting electrode layer comprises emitting electrodes 1125 arranged along a longitudinal array, the receiving electrode layer comprises receiving electrodes 1126 arranged along a transverse array, the emitting electrodes 1125 and the receiving electrodes 1126 are electrically connected at different layer cross points, each different layer cross point is a touch unit, all the emitting electrodes 1125 are electrically connected with the same touch wire 1127, and all the receiving electrodes 1126 are electrically connected with the same touch wire 1128. The frame area of the touch integrated Micro-LED display panel further comprises a flexible circuit board 1011 and a control chip 1002 attached to the flexible circuit board 1001, and the touch traces 1127 and 1128 are electrically connected to the control chip 1002 through the flexible circuit board 1001.
The emitter electrodes 1125 of the present embodiment are arranged laterally to form X1 rows of emitter electrodes 1125, X2 rows of emitter electrodes 1125, X3 rows of emitter electrodes 1125, …, Xm rows of emitter electrodes 1125; the receiving electrodes 1126 are longitudinally arranged to form Y1 columns of receiving electrodes 1126, Y2 columns of receiving electrodes 1126, Y3 columns of receiving electrodes 1126, … and Yn columns of receiving electrodes 1126; for example, for the detection of the touch position, the overlapping position corresponding to the X2 rows of transmitting electrodes 1125/Y2 columns of receiving electrodes 1126 with changed touch sensing signals is the touch position; for the detection of the touch pressure, the touch pressure at the position corresponding to the Y2 column receiving electrode 1126 having a large variation of the touch sensing signal is large.
As shown in fig. 8, the structure of the touch integrated Micro-LED display panel 100 of the present embodiment is similar to that of fig. 7, and the driving manner is different, in which all of the emitting electrodes 1125 are electrically connected to the same touch trace 1127, and all of the receiving electrodes 1126 are electrically connected to the same touch trace 1128. The frame area of the touch integrated Micro-LED display panel further comprises a flexible circuit board 1011 and a control chip 1002, and a touch wire 1127, wherein the touch wire 1128 is directly and electrically connected with the control chip 1002.
The invention provides a control time sequence design schematic diagram of a novel touch integrated Micro-LED display panel. As shown in fig. 9, a normal frame includes a display time and a blank time, and as shown in fig. 10, a frame of the present invention includes a display time and a touch time, and performs time-sharing control on display and touch.
In summary, although the present invention has been described with reference to the preferred embodiments, the above-described preferred embodiments are not intended to limit the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, therefore, the scope of the present invention shall be determined by the appended claims.
Claims (10)
1. A touch integrated Micro-LED display panel is characterized by comprising an array substrate and a Micro-LED chip positioned on the array substrate;
the array substrate is internally provided with a touch layer, the touch layer and a metal layer of a thin film transistor in the array substrate are prepared on the same layer, and the touch layer and a display driving wire of the array substrate are connected with the same driving control chip.
2. The touch integrated Micro-LED display panel of claim 1, wherein the touch layer comprises a touch sensor layer and the touch routing layer electrically connected to the touch sensor layer;
the array substrate at least comprises a substrate, an active layer positioned on the substrate, a grid positioned on the active layer, a source/drain layer positioned on the grid, a touch routing layer positioned on the source/drain layer, and a touch sensor layer positioned on the touch routing layer.
3. The touch integrated Micro-LED display panel of claim 2, wherein the touch sensor layer is divided into a plurality of touch units along the longitudinal and lateral directions, each touch unit being electrically connected to one touch trace individually.
4. The touch integrated Micro-LED display panel of claim 2, wherein a landing electrode layer electrically connected to the Micro-LED chip is further disposed above the touch sensor layer.
5. The touch integrated Micro-LED display panel of claim 1, wherein the touch layer comprises a transmitting electrode layer and a receiving electrode layer arranged in a cross manner, the transmitting electrode layer being electrically connected to one touch trace, the receiving electrode layer being electrically connected to another touch trace.
6. The touch integrated Micro-LED display panel of claim 5, wherein the emitter electrode layer comprises emitter electrodes arranged in a longitudinal array, the receiver electrode layer comprises receiver electrodes arranged in a transverse array, and the emitter electrodes and the receiver electrodes are electrically connected at different layer intersections.
7. The touch integrated Micro-LED display panel according to claim 3 or 5, wherein the bending region of the touch integrated Micro-LED display panel further comprises a flexible circuit board and the driving control chip, and the touch trace is electrically connected to the driving control chip through the flexible circuit board; or, the touch routing is directly electrically connected with the driving control chip.
8. The touch integrated Micro-LED display panel according to claim 3 or 5, wherein a projection of the touch trace on the touch integrated Micro-LED display panel does not overlap with the light emitting points of the Micro-LED chip, and the touch trace comprises a single film layer of silver, copper, aluminum, molybdenum, titanium or a combined film layer of multiple materials.
9. The touch integrated Micro-LED display panel according to claim 4, wherein a protective layer is further disposed on the surface of the overlapping electrode layer, an opening is disposed at a position of the protective layer corresponding to the Micro-LED chip, and pins of the Micro-LED chip are filled in the opening and electrically connected to the overlapping electrode layer.
10. The touch integrated Micro-LED display panel of claim 1, wherein the driving control chip is a TDDI touch and display integrated driver.
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| CN202111336879.3A CN114078401B (en) | 2021-11-12 | 2021-11-12 | Touch integrated Micro-LED display panel |
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| US20110063243A1 (en) * | 2009-09-15 | 2011-03-17 | Cheol-Se Kim | Photo-sensing type touch panel embedded liquid crystal display device and method for driving the same |
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| CN114078401B (en) | 2023-07-25 |
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