CN112905053B - Touch display panel - Google Patents
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- CN112905053B CN112905053B CN202110248916.9A CN202110248916A CN112905053B CN 112905053 B CN112905053 B CN 112905053B CN 202110248916 A CN202110248916 A CN 202110248916A CN 112905053 B CN112905053 B CN 112905053B
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Classifications
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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
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
- G06F3/04166—Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/13338—Input devices, e.g. touch panels
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1343—Electrodes
- G02F1/134309—Electrodes characterised by their geometrical arrangement
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
- G02F1/1362—Active matrix addressed cells
- G02F1/136286—Wiring, e.g. gate line, drain line
-
- 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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- 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
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
- G06F3/04164—Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mathematical Physics (AREA)
- Crystallography & Structural Chemistry (AREA)
- Human Computer Interaction (AREA)
- Optics & Photonics (AREA)
- Computer Networks & Wireless Communication (AREA)
- Geometry (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Position Input By Displaying (AREA)
- Liquid Crystal Display Device Control (AREA)
- Liquid Crystal (AREA)
Abstract
The touch display panel comprises a display driver, a light control sensor and a touch sensor, wherein a frame of display period of the touch display panel comprises a first time period and a second time period, the display driver and the light control sensor work simultaneously in the first time period, and the touch sensor works in the second time period. The display function and the light control function are synchronously operated, and the display function, the light control function and the driving scheme of touch frame time sharing can effectively separate touch control from display and light control, so that the problems of crosstalk of a common electrode to a touch control signal, crosstalk of a touch control transmitting electrode to a reading line and crosstalk of a touch control electric field to liquid crystal can be effectively solved.
Description
Technical Field
The present disclosure relates to touch display technology, and more particularly, to a touch display panel.
Background
With the development of display technology, more and more functions are integrated in the display device, and new functions are synchronously given to the display device. The display device is used as an important interface of man-machine interaction, and the sensor is integrated in the display device, so that the display device is an important bridge for man-machine interaction. In some special use environments, the large-size display liquid crystal screen needs to meet the functions of realizing remote control and short-range control, so that the touch control or light control display technology with a single function has defects.
For lower manufacturing cost and thinner thickness, the photo-sensor and the touch sensor are generally integrated in a liquid crystal display box (in cell), but parasitic capacitance exists between an electrode of the photo-sensor and a receiving electrode of the touch sensor, and mutual crosstalk of electric fields between the photo-sensor and a pixel electrode as well as between the photo-sensor and liquid crystal are all restricted to the application of a large-size liquid crystal display screen integrating photo-control and touch functions.
Therefore, the existing large-size liquid crystal display screen for synchronously realizing the light control and touch control functions needs to be improved.
Disclosure of Invention
The embodiment of the invention provides a touch display panel, which aims to solve the technical problems that in the existing touch display panel, an optical control sensor and a touch sensor are of in cell structures, parasitic capacitance exists between an electrode of the optical control sensor and a receiving electrode of the touch sensor, and electric fields among the optical control sensor, a pixel electrode and liquid crystal are mutually crosstalked, so that display is affected.
In order to solve the problems, the technical scheme provided by the invention is as follows:
the embodiment of the invention provides a touch display panel, which comprises a display driver, a light control sensor and a touch sensor, wherein the display driver is used for realizing display, the light control sensor is used for realizing optical touch, and the touch sensor is used for realizing capacitive touch; the display driver and the light control sensor work simultaneously in the first time period, and the touch sensor works in the second time period.
In an embodiment of the invention, the touch display panel further includes a plurality of scan lines, and the light-operated touch sensor and the display driver are electrically connected to the same scan line.
In one embodiment of the present invention, the photo sensor includes an output transistor and a photo transistor electrically connected, wherein a gate of the output transistor is electrically connected to the scan line.
In one embodiment of the present invention, the display driver includes a switching transistor having a gate electrically connected to the scan line.
In an embodiment of the present invention, the touch display panel further includes:
a first substrate;
a second substrate disposed opposite to the first substrate;
a pixel electrode disposed on a side of the first substrate facing the second substrate; and
the multiplexing electrode is arranged on one side of the second substrate facing the first substrate and comprises a plurality of first electrode blocks.
In one embodiment of the present invention, the display driver and the photo-sensor are disposed on the first substrate in the same layer.
In one embodiment of the present invention, the touch sensor includes:
the first touch electrode is arranged on one side of the second substrate facing the first substrate;
the first touch electrode is arranged on one side of the second substrate, which is away from the first substrate; and in the second time period, at least part of the first electrode blocks are multiplexed into the first touch electrode.
In one embodiment of the present invention, the first electrode blocks of odd or even rows are multiplexed into the first touch electrode.
In an embodiment of the invention, the first touch electrode includes a plurality of second electrode blocks arranged in an array and second bridging lines, and the second bridging lines connect two adjacent second electrode blocks in the same column.
In one embodiment of the present invention, the second electrode block and the first electrode block multiplexed as the first touch electrode do not have an overlapping surface therebetween.
The beneficial effects of the invention are as follows: the embodiment of the invention adopts a driving scheme that the display function and the light control function synchronously work, and the display function and the light control function are in time sharing with the touch frame, so that the touch and display can be effectively separated, the light control can be effectively realized, and the problems of crosstalk of a common electrode to a touch signal, crosstalk of a touch emission electrode to a readout line and crosstalk of a touch electric field to liquid crystal can be effectively solved; in addition, the common electrode is multiplexed into the touch emission electrode, and the light control sensor is integrated on the film layer of the display driver, so that the thickness of the touch display panel can be reduced, and the process cost is saved.
Drawings
Fig. 1 is a schematic structural diagram of a touch display panel according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an integrated circuit of a photo sensor and a display driver according to an embodiment of the present invention;
fig. 3 is a timing chart of integrated display of a light control sensor and a touch sensor according to an embodiment of the present invention;
fig. 4 is a schematic plan view of a second touch electrode according to an embodiment of the present invention;
fig. 5 is a schematic plan view of a multiplexing electrode according to an embodiment of the present invention;
fig. 6 is a schematic plan view of a first touch electrode and a second touch electrode according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
In the description of the present application, it should be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or an implicit indication of the number of technical features being indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically connected, electrically connected or can be communicated with each other; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.
The following disclosure provides many different embodiments or examples for implementing different structures of the present application. In order to simplify the disclosure of the present application, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present application. Furthermore, the present application may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and which do not in themselves indicate the relationship between the various embodiments and/or arrangements discussed. In addition, the present application provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize the application of other processes and/or the use of other materials.
The invention aims at solving the technical problems that the prior touch display panel, the light control sensor and the touch sensor are in a cell structure, so that parasitic capacitance exists between an electrode of the light control sensor and a receiving electrode of the touch sensor, and electric fields among the light control sensor, a pixel electrode and liquid crystal are mutually crosstalked, thereby influencing display.
Referring to fig. 1, an embodiment of the present invention provides a touch display panel 100, which includes a display driver, a light control sensor, and a touch sensor, wherein the display driver is used for realizing display, the light control sensor is used for realizing optical touch, and the touch sensor is used for realizing capacitive touch.
The light control sensor can be used for remote touch control, and the touch control sensor can be used for short-range touch control, so that display of multifunctional touch control is realized.
Specifically, the photo-sensor includes an output transistor T2 and a photo-sensing transistor T3 electrically connected, wherein the photo-sensing transistor T3 is configured to sense a change in luminous flux, generate a photocurrent according to the sensed luminous flux, and the photocurrent flows from a source to a drain of the sensing transistor T3 via a channel, and charges generated by the photocurrent are output to the detection IC through the output transistor T2. Whether or not a touch is made is determined based on the value of the photocurrent. The photo sensor includes, but is not limited to, any one of a 2T1C (two thin film transistors and 1 storage capacitor) architecture, a 4T1C architecture, and a 5T1C architecture. In this embodiment, a 2T1C structure is taken as an example.
The touch sensor can be in a mutual capacitance touch mode and comprises a transmitting electrode and a touch electrode.
The touch display panel 100 further includes a first substrate 10 and a light emitting layer disposed on the first substrate 10, and the display driver is configured to drive the light emitting layer to emit light to realize display, where the light emitting layer includes any one of, but not limited to, a liquid crystal material, an OLED (organic light emitting diode), a QLED (quantum dot light emitting diode), a Mini-led, and a Micro-led.
In this embodiment, the photo-sensor may be in cell structure, that is, integrated inside the light emitting layer. The overall thickness of the touch display panel 100 can be reduced compared to an externally hung structure.
Specifically, the light control sensor is disposed on the first substrate 10 and disposed between the first substrate 10 and the light emitting layer.
Further, the photo sensor may be disposed on the first substrate 10 in the same layer as the display driver, i.e., each metal device of the thin film transistor of the photo sensor may be formed through the corresponding same metal layer as each metal device of the thin film transistor of the display driver.
Because the light-operated sensor and the touch sensor are synchronously integrated in the display layer in the prior art, parasitic capacitance exists between the electrode of the light-operated sensor and the electrode of the touch sensor, and electric fields between the sensors are mutually crosstalked, one of the transmitting electrode and the receiving electrode of the touch sensor is arranged as an externally hung structure (arranged outside the luminous layer), and the other is arranged as an in cell structure (arranged inside the luminous layer), so that the crosstalk influence of the electrode of the touch sensor on other sensors is reduced, and compared with the purely externally hung structure (the transmitting electrode and the receiving electrode are arranged outside the luminous layer), the touch sensor has lower cost and thinner thickness.
The one-frame display period of the touch display panel may include a first period of time in which the display driver and the light control sensor operate; and in the second time period, the touch sensor works. The touch sensor works in a frame time-sharing manner with the display driver and the light-operated sensor, so that the problems of crosstalk of a common electrode of the display driver to a touch signal and parasitic capacitance generated between an electrode of the light-operated sensor and a touch electrode can be solved.
The touch display panel further comprises a plurality of scanning lines, and the light-operated touch sensor and the display driver are electrically connected to the same scanning line, so that synchronous operation of display and light control is realized, and the refresh rate and the point reporting rate of the display and the light control are improved.
The light control sensor comprises an output transistor and a light sensing transistor which are electrically connected, and the grid electrode of the output transistor is electrically connected to the scanning line; the display driver includes a switching transistor having a gate electrically connected to the scan line.
Referring to fig. 1 and 2, an embodiment of the invention is illustrated by a liquid crystal display panel, but not limited thereto. The touch display panel 100 includes a first substrate 10 and a second substrate 60 disposed opposite to each other, the display driver 101 and the light control sensor 102 are disposed on the first substrate 10, and the touch sensor is disposed on the second substrate 60.
The touch display panel 100 further includes a liquid crystal layer 50 sandwiched between the first substrate 10 and the second substrate 60, a pixel electrode 30 disposed on a side of the first substrate 10 facing the second substrate 60, and a multiplexing electrode disposed on a side of the second substrate 60 facing the first substrate 10.
The pixel electrode 30 is disposed on the display driver 101 and the photo sensor 102, and the pixel electrode 30 is electrically connected to the switching transistor T1 of the display driver 101.
The touch sensor is of a mutual capacitance touch structure, and comprises a first touch electrode 92 and a second touch electrode 110, wherein the first touch electrode 92 is one of a transmitting electrode Tx and a receiving electrode Rx, and the second touch electrode 110 is the other of the transmitting electrode Tx and the receiving electrode Rx. In the present embodiment, the first touch electrode 92 is a transmitting electrode Tx, and the second touch electrode 110 is a receiving electrode Rx, but not limited thereto.
The first touch electrode 92 may be disposed on a side of the second substrate 60 facing the first substrate 10, and the second touch electrode 110 may be disposed on a side of the second substrate 60 facing away from the first substrate 10.
The multiplexing electrode is used as an electrode of different functions at different time periods, and can reduce the process cost and the thickness of the touch display panel 100. When the multiplexing electrode is used as a common electrode in the display stage, the common electrode and the pixel electrode 30 form a liquid crystal capacitor, and at least a part of the multiplexing electrode is used as a transmitting electrode or a receiving electrode of a touch driver in the touch stage, so that the interference of the common electrode on touch signals can be effectively solved, and the improvement on the VA type display panel is more obvious.
In this embodiment, the photo sensor 102 may have a 2T1C structure, and the photo sensor 102 includes an output transistor T2, a photo transistor T3, and a storage capacitor Cst. In other embodiments, the photo-sensor 102 may be a 3T1C, 4T1C, or 5T1C driving architecture.
Referring to fig. 2, the touch display panel 100 further includes a plurality of scan lines Gate and a plurality of Data lines Data, and the scan lines Gate and the Data lines Data are staggered with each other to define a plurality of pixel regions. The display driver 101 is disposed at the intersection of the scan line Gate and the data line Date.
The photo-sensor 102 and the display driver 101 are electrically connected to the same scan line Gate, so as to realize synchronous scanning of the photo-sensor 102 and the display driver 101.
Specifically, the gate of the output transistor is electrically connected to the scan line, and the display driver includes a switching transistor, and the gate of the switching transistor is electrically connected to the scan line.
The Gate electrode of the switching transistor T1 is electrically connected to the corresponding scan line Gate, the source electrode or drain electrode of the switching transistor T1 is connected to the Data line Data, and the drain electrode or source electrode of the switching transistor T2 is connected to the pixel electrode 30.
The touch display panel 100 further includes a first power line SVDD, a second power line SVGG, and a Readout line Readout.
The Gate of the output transistor T2 is connected to the scan line Gate, the source or the drain of the output transistor T2 is connected to the node a, the drain or the source of the output transistor T2 is connected to the Readout line Readout, the Gate of the photo transistor T3 is connected to the second power line SVGG, the source of the photo transistor T3 is connected to the first power line SVDD, the drain of the photo transistor T3 is connected to the node a, one end of the storage capacitor Cst is connected to the node a, and the other end of the storage capacitor Cst is connected to the second power line SVGG. The Readout line Readout may be externally connected to a detection unit IC of the touch display panel 100 for detecting a light control position, where voltages of the first power line SVDD and the second power line SVGG are fixed voltages.
The driving principle of the photo-sensor 102 is as follows: when a specific light amount is sensed in the active layer of the photo transistor T3, a photocurrent is generated according to the sensed light amount and flows from the source to the drain of the sensing transistor T3 via the channel, by applying a driving voltage to the source of the photo transistor T3 through the first power line SVDD and a fixed voltage to the gate of the photo transistor T3 through the second power line SVGG. The photocurrent flows to the storage capacitor Cst through the drain electrode of the photo transistor T3. Accordingly, charges generated by the photocurrent are accumulated in the storage capacitor Cst through the first and second source lines SVDD and SVGG. The charge accumulated in the storage capacitor Cst flows to the Readout line Readout through the source or drain of the output transistor T2 to be detected by the detection unit IC connected to the Readout line Readout, and it is determined whether to perform light control based on the value of the photocurrent.
Referring to fig. 3, gate (n) represents an nth row scan line, and Tx n represents a transmitting electrode of the nth row. The light control and display of the embodiment of the present invention are performed synchronously, and the light control and display are performed together with the touch time sharing, so that the liquid crystal can be prevented from being affected by the crosstalk of the touch electric field, the Readout line Readout of the light control sensor 102 is prevented from being affected by the crosstalk of the transmitting electrode Tx (the first touch electrode in the present embodiment), and the transmitting electrode Tx is prevented from being affected by the crosstalk of the common electrode on the side of the second substrate 60 and the electrode of the light control sensor 102.
Specifically, the time t=t1+t2 for completing display, light control and touch in one frame corresponds to the frequency f=1/(t1+t2), and in the first time period T1, the plurality of scan lines Gate1 to Gate (n) on the touch display panel 100 scan line by line, the light control and display complete scanning of one frame, and the working time of the display driver 101 and the light control sensor 102 in one frame period is T1; in the second period t2, the touch sensor operates, the transmitting electrodes Tx1 to Txn transmit touch driving signals row by row, the light control sensor 102 and the display driver 101 stop operating, and the operating time of the touch sensor in one frame period is t2.
Referring to fig. 1, the devices of the display driver 101 and the devices of the photo-sensor 102 may be arranged in the same layer to save the process cost and reduce the thickness of the touch display panel 100.
Specifically, the switching transistor T1 of the display driver 101 includes a first gate electrode 111, a first active layer 121, a first source electrode 131, and a first drain electrode 132. In other embodiments, the display driver 101 may be a 3T1C, 5T1C or 7T1C driving architecture, for example, in other active light emitting display panels such as OLED touch display panels, the display driver 101 may include a switching transistor T1, a driving transistor, a reset transistor, and the like.
The output transistor T2 of the photo-driver 102 includes a second gate 112, a second active layer 122, a second source 133, and a second drain 134; the light sensing transistor T3 includes a third gate electrode 113, a third active layer 123, a third source electrode 135, and a third drain electrode 136.
The first gate 111, the second gate 112, and the third gate 113 are disposed in the same layer, and the patterned gate patterns may be formed by depositing a first metal layer on the first substrate 10 and performing the same etching process.
The first active layer 121, the second active layer 122, and the third active layer 123 are arranged in the same layer, and the materials of the respective active layers include, but are not limited to, a-Si: any semiconductor material of H, ge and Si-Ge can be used for forming patterns of each patterned active layer through processes such as coating the semiconductor material, etching and the like.
The first source 131, the first drain 132, the second source 133, the second drain 134, the third source 135, and the third drain 136 are arranged in the same layer, and each patterned source and drain pattern is formed by depositing a second metal layer over each active layer and performing the same etching process on the second metal layer.
The first gate 111, the second gate 112, and the third gate 113 are covered with a gate insulating layer 21, the first active layer 121, the second active layer 122, and the third active layer 123 are disposed on the gate insulating layer 21, the first source 131 and the first drain 132 are overlapped at two ends of the first active layer 121, the second source 133 and the second drain 134 are overlapped at two ends of the second active layer 122, and the third source 135 and the third drain 136 are overlapped at two ends of the third active layer 123, wherein the second drain 134 is connected with the third source 135.
The first source electrode 131, the first drain electrode 132, the second source electrode 133, the second drain electrode 134, the third source electrode 135, and the third drain electrode 136 are provided with a passivation layer 22, the pixel electrode 30 is disposed on the passivation layer 22, a via hole is disposed on the passivation layer 22, and the pixel electrode 30 is connected with the first drain electrode 132 through the via hole.
The touch display panel 100 may be a COA (Color filter on array, color filter integrated on an array substrate) structure or a Non-COA structure. When the touch display panel 100 has a COA structure, a color filter layer may be disposed on the first substrate 10, specifically between the display driver 101 and the pixel electrode 30. When the touch display panel 100 is of a Non-COA architecture, the color filter layer may be disposed on the second substrate 60, and in particular may be disposed on a side of the second substrate 60 facing the first substrate 10.
In this embodiment, taking a Non-COA type structure as an example, the color filter layer 70 is disposed on a side of the second substrate 60 facing the first substrate 10, the color filter layer 70 includes a plurality of first color resistors 71, second color resistors 72, and third color resistors 73 distributed in an array and having different colors, a black matrix 80 is disposed between adjacent color resistors, and the multiplexing electrode is disposed on the black matrix 80. The black matrix 80 and the color filter layer 70 should avoid the channel of the phototransistor T3 (the portion of the third active layer 123 between the third source electrode 135 and the third drain electrode 136), so as to avoid the influence of the filtering effect of the black matrix 80 and the color resistor on the received luminous flux of the phototransistor T3. I.e. the black matrix 80 and the color filter layer 70 do not have overlapping surfaces with the channels of the phototransistor T3.
The light sensing wave band of the light sensing sensor is visible light wave band (380-780 nanometers) or infrared light (780-1000 nanometers).
Referring to fig. 1 and 5, the multiplexing electrode 90 is disposed on a side of the black matrix 80 facing the first substrate 10, and the multiplexing electrode includes a plurality of first electrode blocks 91 distributed in an array and a plurality of first bridge wires 93, wherein the first bridge wires 93 connect two adjacent first electrode blocks 91 in the same row X.
In one embodiment, each of the first electrode blocks 91 of the multiplexing electrode 90 is multiplexed as a common electrode.
In one embodiment, a portion of the first electrode block 91 of the multiplexing electrode 90 is multiplexed into a first touch electrode 92. Specifically, the first electrode blocks 91 of the odd or even rows are multiplexed into the first touch electrodes 92. In this embodiment, the area of the electrode blocks in the row where the first touch electrode 92 is located is larger than the area of the electrode blocks in the adjacent row.
The shape of the electrode block 91 includes any one of a diamond shape, a square shape, a circular shape, and the like, and the electrode block 91 is a diamond shape in this embodiment.
The spacing between adjacent electrode blocks 91 may be 2-10 microns, which is too small to easily cause a short circuit.
The materials of the pixel electrode 30 and the multiplexing electrode 90 may be transparent conductive materials, such as ITO materials.
Referring to fig. 1 and 4, the second touch electrode 110 is disposed on a side of the second substrate 60 facing away from the first substrate 10, the second touch electrode 110 includes a plurality of second electrode blocks 111 and a plurality of second bridging lines 112 disposed in an array, and the second bridging lines 112 connect two adjacent second electrode blocks 111 in the same column Y.
Referring to fig. 6, the second touch electrode 110 and the first electrode block 91 multiplexed as the first touch electrode 92 have no overlapping surface, i.e. in the thickness direction, the orthographic projection of the second electrode 110 on the multiplexing electrode 90 and the first electrode block 91 multiplexed as the first touch electrode 92 do not overlap.
The material of the second touch electrode 110 includes, but is not limited to, one or more of ITO, transparent conductive polymer PEDOT, metal nanowires, graphene, carbon nanotubes, and Cu, al, au, pt, ag, mo.
Referring to fig. 1, the touch display panel 100 further includes a first alignment layer 41 and a second alignment layer 42, the first alignment layer 41 is disposed on a side of the first pixel electrode 30 facing the second substrate 60, the second alignment layer 42 is disposed on a side of the multiplexing electrode 90 facing the second substrate, and the liquid crystal is filled between the first alignment layer 41 and the second alignment layer 42.
The touch display panel 100 further includes an upper polarizer 130 and a lower polarizer (not shown), wherein the upper polarizer 130 is disposed on a side of the second touch electrode 110 facing away from the first substrate 10, and the lower polarizer is disposed on a side of the first substrate 10 facing away from the second substrate 60. The upper polarizer 130 and the second touch electrode 110 are adhered by a transparent optical adhesive layer 120.
The embodiment of the invention adopts a driving scheme that the display function and the light control function synchronously work, and the display function and the light control function are in time sharing with the touch frame, so that the touch and display can be effectively separated, the light control can be effectively realized, and the problems of crosstalk of a common electrode to a touch signal, crosstalk of a touch emission electrode to a readout line and crosstalk of a touch electric field to liquid crystal can be effectively solved; in addition, the common electrode is multiplexed into the touch emission electrode, and the light control sensor is integrated on the film layer of the display driver, so that the thickness of the touch display panel can be reduced, and the process cost is saved.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to related descriptions of other embodiments.
The above describes a touch display panel provided by the embodiment of the present invention in detail, and specific examples are applied to describe the principle and implementation of the present invention, and the description of the above embodiment is only used to help understand the technical solution and core idea of the present invention; those of ordinary skill in the art will appreciate that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (8)
1. A touch display panel, comprising:
a display driver for implementing display;
the light control sensor is used for realizing optical touch control;
the touch sensor is used for realizing capacitive touch; the touch sensor comprises a transmitting electrode and a receiving electrode; and
a multiplexing electrode serving as a common electrode in a display stage and at least a portion thereof serving as the emitter electrode in a touch stage;
the light-operated sensor and the display driver are electrically connected to the same scanning line;
the touch display panel further comprises a first substrate, a second substrate and a light-emitting layer, wherein the first substrate and the second substrate are opposite to each other, the light-emitting layer is arranged between the first substrate and the second substrate, the display driver and the light-operated sensor are arranged on one side, close to the light-emitting layer, of the first substrate, the multiplexing electrode is arranged on one side, close to the light-emitting layer, of the second substrate, and the receiving electrode is arranged on one side, far from the light-emitting layer, of the second substrate;
the touch control display panel comprises a display period of one frame, wherein the display period of the touch control display panel comprises a first time period and a second time period, the scanning lines are opened row by row in the first time period to synchronously drive the display driver and the light control sensor, and the touch control sensor works in the second time period.
2. The touch display panel of claim 1, wherein the photo sensor comprises an output transistor and a photo transistor electrically connected, wherein a gate of the output transistor is electrically connected to the scan line.
3. The touch display panel of claim 1, wherein the display driver comprises a switching transistor, a gate of the switching transistor being electrically connected to the scan line.
4. The touch display panel of claim 1, further comprising:
a pixel electrode disposed on a side of the first substrate facing the second substrate; and
the multiplexing electrode includes a plurality of first electrode blocks.
5. The touch display panel of claim 4, wherein the display driver and the photo-sensor are disposed on the first substrate in the same layer.
6. The touch display panel of claim 5, wherein the first electrode blocks of odd or even rows are multiplexed as the emitter electrodes.
7. The touch display panel according to claim 5, wherein the receiving electrode includes a plurality of second electrode blocks and second bridging lines arranged in an array, and the second bridging lines connect two adjacent second electrode blocks in the same column.
8. The touch display panel according to claim 7, wherein the second electrode block and the first electrode block multiplexed as the emitter electrode do not have an overlapping surface therebetween.
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| CN113485048B (en) * | 2021-07-30 | 2023-10-31 | 深圳市华星光电半导体显示技术有限公司 | Display panel, display terminal and display driving method |
| CN114020167B (en) * | 2021-10-28 | 2024-07-02 | Tcl华星光电技术有限公司 | Touch display panel and display device |
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