CN109901746B - Touch display device and portable computing terminal - Google Patents
Touch display device and portable computing terminal Download PDFInfo
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- CN109901746B CN109901746B CN201910130522.6A CN201910130522A CN109901746B CN 109901746 B CN109901746 B CN 109901746B CN 201910130522 A CN201910130522 A CN 201910130522A CN 109901746 B CN109901746 B CN 109901746B
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Abstract
The embodiment of the application provides a touch display device and a portable computing terminal. The first substrate is provided with a plurality of electrode arrays, and each electrode array comprises at least one electrode unit. Each channel selection unit includes a plurality of channel selection switches. When displaying, the touch display chip controls the conduction of each channel selection switch, and loads a common electrode signal to the electrode unit. And during touch control, the touch control display chip controls the conduction of the target channel selection switch and loads a touch control detection signal to the target electrode unit. Therefore, the internal circuit of the touch display chip and the lead circuit between the electrode unit and the touch display chip are simplified, the number of pins of the touch display chip is reduced, the size of the touch display chip is reduced, and the integration level of the touch display device is improved.
Description
Technical Field
The present disclosure relates to the field of touch display devices, and more particularly, to a touch display device and a portable computing terminal.
Background
In the field of Touch Display devices, to improve the Integration of devices, a Touch and Display Driver Integration (TDDI) technology is often adopted to integrate a Touch panel and a Display panel into a Touch Display substrate.
Fig. 1 shows a schematic structural diagram of a conventional touch display device 100. As shown in fig. 1, the touch display device 100 includes a first substrate 110 and a touch display chip 130, wherein a plurality of electrode units 113 are disposed on the first substrate 110, and each electrode unit 113 is connected to the touch display chip 130. The touch display chip includes a touch module 131 and a display module 133. The touch module 131 is connected to each electrode unit 113 through a MUX (multiplexer), and the display module 133 is connected to each electrode unit 113.
The operating state of the touch display device 100 may include a display state and a touch state. In the touch state, the electrode units 113 serve as touch detection electrodes, and the touch module 131 sequentially loads touch detection signals to the electrode units 113 through the MUX. In the display state, the electrode units 113 serve as display common electrodes, and the display module 133 applies common electrode signals to the respective electrode units 113.
Disclosure of Invention
In view of the above, an object of the present application is to provide a touch display device and a portable computing terminal, so as to solve or improve the above-mentioned problems.
In order to achieve the above purpose, the embodiments of the present application employ the following technical solutions:
in a first aspect, an embodiment of the present application provides a touch display device, including:
the electrode structure comprises a first substrate, a second substrate and a third substrate, wherein a plurality of electrode arrays are arranged on the first substrate, and each electrode array comprises at least one electrode unit;
the channel selection units are integrally arranged on the first substrate, each channel selection unit corresponds to one of the electrode arrays, and each channel selection unit comprises a plurality of channel selection switches which are in one-to-one correspondence connection with each electrode unit in the corresponding electrode array;
the touch display chip is electrically connected with the channel selection unit;
when the touch display device is in a display state, the touch display chip is used for controlling each channel selection switch of each channel selection unit to be in a conducting state and loading a common electrode signal to the electrode unit connected with each channel selection switch; when the touch display device is in a touch state, the touch display chip is used for selecting a target channel selection switch from each channel selection unit and loading a touch detection signal to an electrode unit connected with the target channel selection switch through the target channel selection switch after controlling the target channel selection switch to be in a conducting state.
Optionally, the channel selection unit includes a control terminal, an input terminal, and an output terminal, and the channel selection switch is formed by a field effect transistor;
the source electrodes of the field effect transistors are connected with each other to form the output end of the channel selection unit; the drain electrode of each field effect tube forms the input end of the channel selection unit; the gate of each field effect transistor forms the control terminal of the channel selection unit.
Optionally, the touch display device further includes a switch decoder electrically connected to each channel selection unit, where the switch decoder includes a control end and an output end;
the control end of the switch decoder is used for accessing the alternate selection signal, and the output end of the switch decoder is connected with the control end of each channel selection unit;
the switch decoder is configured to select a target channel selection switch from each channel selection switch of each channel selection unit according to the round selection signal, and apply a turn-on voltage to a gate of the target channel selection switch to turn on the target channel selection switch.
Optionally, the switch decoder further includes a state terminal, and the state terminal of the switch decoder is used for accessing a full selection signal;
and the switch decoder is also used for loading a conducting voltage to the grid electrode of each channel selection switch of each channel selection unit according to the full selection signal so as to conduct each channel selection switch of each channel selection unit.
Optionally, the touch display device further includes an array substrate row driving circuit connected to the switch decoder and the touch display chip, respectively;
the array substrate row driving circuit is used for generating a full selection signal and a round selection signal according to the working signal of the touch display chip, sending the full selection signal to the switch decoder through the control end of the switch decoder, and sending the round selection signal to the switch decoder through the state end of the switch decoder.
Optionally, the touch display device further includes:
the second substrate is arranged opposite to the first substrate, and a plurality of color filter arrays are arranged on the second substrate;
a liquid crystal layer disposed between the first and second substrates;
the pixel array is electrically connected with the touch display chip and arranged on the first substrate;
when the touch display device is in a display state, the touch display chip is used for loading image signals to the pixel array, so that an electric field is formed between the pixel array and the electrode array to drive liquid crystal molecules in the liquid crystal layer to rotate.
Optionally, the pixel array is composed of thin film transistors;
and when the first substrate is etched, the pixel array and the channel selection unit are simultaneously formed on the first substrate.
Optionally, the touch display device further includes a second substrate disposed opposite to the first substrate, wherein the second substrate is provided with a plurality of LED light emitting arrays;
the LED light emitting array is electrically connected with the touch display chip;
when the touch display device is in a display state, the first substrate serves as a metal cathode of the LED light emitting array, and the touch display chip loads a display signal to the LED light emitting array so that the LED light emitting array emits display light.
Optionally, the touch display device further includes:
the channel selection unit comprises a plurality of driving selection units, each driving selection unit corresponds to one of the electrode arrays, and each channel selection unit comprises a driving selection switch connected with each electrode unit in the corresponding electrode array; and
a common driving electrode electrically connected to each of the driving selection switches;
when the touch display device is in a display state, each drive selection switch of each drive selection unit is conducted, and the common electrode is used for loading a common electrode signal to the electrode unit; and when the touch display device is in a touch state, a driving selection switch connected with the target channel selection switch in the driving selection unit is in a closed state.
Optionally, each of the electrode arrays comprises a plurality of profiled electrode elements, the respective profiled electrode elements of each of the electrode arrays forming a rectangular electrode array.
Optionally, the special-shaped electrode units are triangular electrode units, and the shapes of the triangular electrode units are the same;
each electrode array comprises two triangular electrode units; for each electrode array, the two triangular electrode units of the electrode array are distributed in central symmetry about the central point of the electrode array.
Optionally, the touch display device further includes a frame lead circuit disposed on both sides of the electrode array and connected between the triangular electrode unit and the channel selection switch.
Optionally, the first substrate comprises a flexible substrate.
In a second aspect, an embodiment of the present application further provides a portable computing terminal, where the portable computing terminal includes a central chip and the touch display device of the first aspect;
the central chip is electrically connected with the touch display device and is used for controlling the touch display device to be in a display state or a touch state.
Compared with the prior art, the beneficial effects provided by the application are that:
according to the touch display device and the portable computing terminal provided by the embodiment of the application, the plurality of channel selection units are integrally arranged on the first substrate, the plurality of electrode units on the first substrate form an electrode array, and each electrode array corresponds to one channel selection unit. The touch display chip is connected with each electrode unit through the channel selection unit, so that a lead circuit between the electrode units and the touch display chip is simplified, and the integration level of the touch display device is improved; for the touch display device, the lead circuit is generally disposed in the frame area of the touch display device, and simplifying the lead circuit can simultaneously reduce the frame size of the touch display device. Meanwhile, the number of pins of the touch display chip is reduced, and the size of the touch display chip is reduced. In addition, all the channel selection switches in the channel selection unit can be conducted simultaneously, and a display module in the touch display chip is not required to be connected with all the electrode units, so that an internal circuit of the touch display chip is simplified, and the size of the touch display chip is further reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly described below. It is appreciated that the following drawings depict only certain embodiments of the application and are therefore not to be considered limiting of its scope. For a person skilled in the art, it is possible to derive other relevant figures from these figures without inventive effort.
Fig. 1 is a schematic structural diagram of a conventional touch display device;
fig. 2 is a schematic structural diagram of a touch display device according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of a channel selection unit according to an embodiment of the present application;
fig. 4 is a schematic diagram of an application circuit including a touch display chip according to an embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of another touch display device according to an embodiment of the present disclosure;
fig. 6 is a schematic structural diagram of another touch display device according to an embodiment of the present disclosure.
Icon: 100-touch display device; 110-a first substrate; 111-an electrode array; 113-an electrode unit; 115-triangular electrode units; 130-touch display chip; 131-a touch module; 133-a display module; 150-channel selection unit; 151-channel selection switch; 171-a switch decoder; 173-array substrate row driving circuit; 191-common drive electrode; 193-drive selection unit; 195-drive select switch.
Detailed Description
The inventor of the present application finds that the touch display device 100 in the background art has at least the following technical problems:
1. each electrode unit 113 in the touch display device 100 is connected to the touch display chip 130. In the touch display device 100, the number of the electrode units 113 is large, and the lead circuit between the electrode units 113 and the touch display chip 130 is complicated, so that the integration level of the touch display device 100 is reduced. In addition, since the lead circuit between the electrode unit 113 and the touch display chip 130 is often disposed in the frame area of the touch display device 100 in the touch display device 100, the frame size of the touch display device 100 is increased.
2. The touch display chip 130 is provided with a plurality of MUXs inside, and the touch module 131 needs to be connected to each electrode unit 113 through the MUXs, so that the number of pins of the touch display chip 130 is large, and the size of the touch display chip 130 is seriously increased.
3. Due to the functional limitation of the MUX (the MUX can only select one way to be turned on), the display module 133 needs to be connected to each electrode unit 113 inside the touch display chip 130, so that the internal circuit of the touch display chip 130 is more complicated, and the size of the touch display chip 130 is further increased.
It should be noted that the internal circuit of the touch display chip 130 shown in fig. 1 is only a circuit schematic diagram, and the actual circuit structure may be different from that shown in fig. 1. The touch module 131 may refer to a signal source generating a touch detection signal, and the display module 133 may refer to a signal source generating a common electrode signal (VC OM).
In view of the above technical problems, the inventors of the present application have found that a channel selection unit 150 composed of channel selection switches 151 may be integrally disposed on the first substrate 110, and the touch display chip 130 is connected to each electrode unit 113 through the channel selection unit 150. Thus, the touch display chip 130 can apply a specific signal to the electrode unit 113 by controlling the conducting state of each channel selection switch 151 in the channel selection unit 150, so as to replace the MUX disposed inside the touch display chip 130 in the prior art.
Thus, a plurality of channel selection units 150 are integrally provided on the first substrate 110, and the plurality of electrode units 113 on the first substrate 110 constitute one electrode array 111, and each electrode array 111 corresponds to one channel selection unit 150. The touch display chip 130 is connected with each electrode unit 113 through the channel selection unit 150, so that a lead circuit between the electrode unit 113 and the touch display chip 130 is simplified, and the integration level of the touch display device 100 is improved; for the lead circuit of the touch display device 100, which is generally disposed in the frame area of the touch display device, the lead circuit is simplified to simultaneously reduce the frame size of the touch display device 100. Meanwhile, the number of pins of the touch display chip 130 is reduced, and the size of the touch display chip 130 is reduced. In addition, each channel selection switch in the channel selection unit 150 can be turned on at the same time, and the display module 133 in the touch display chip 130 does not need to be connected to each electrode unit 113, thereby simplifying the internal circuit of the touch display chip 130 and further reducing the size of the touch display chip 130.
The above prior art solutions have drawbacks that are the results of practical and careful study, and therefore, the discovery process of the above problems and the solutions proposed by the following embodiments of the present application to the above problems should be the contributions of the applicant to the present application in the course of the present application.
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, 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, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, as generally described and illustrated in the figures herein, could be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present application, it should be noted that the terms "upper", "lower", and the like refer to orientations or positional relationships based on orientations or positional relationships shown in the drawings or orientations or positional relationships that the product of the application is usually placed in when used, and are used only for convenience of description and simplicity of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, should not be construed as limiting the present application.
In the description of the present application, it is also to be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. The embodiments described below and the keys in the embodiments can be combined with each other without conflict.
Referring to fig. 2, which is a schematic structural view of the touch display device 100 provided in the present application, as shown in fig. 2, the touch display device 100 may include a first substrate 110, a touch display chip 130, and a channel selection unit 150, where the channel selection unit 150 is electrically connected to the touch display chip 130.
A plurality of electrode arrays 111 may be disposed on the first substrate 110, and each electrode array 111 includes at least one electrode unit 113. The electrode arrays 111 correspond to the channel selection units 150 one to one, and each channel selection unit 150 may include channel selection switches 151 connected to the respective electrode units 113 of the corresponding electrode array 111 in one to one correspondence. The channel selection unit 150 may be directly formed of a thin film transistor and integrated on the first substrate 110.
For example, as an alternative embodiment, as shown in fig. 2, each electrode array 111 may include a first electrode unit, a second electrode unit, a third electrode unit, and a fourth electrode unit arranged vertically, and 4 electrode units 113; each channel selection unit 150 may have 4 channel selection switches 151, including a first channel selection switch, a second channel selection switch, a third channel selection switch, and a fourth channel selection switch. For the corresponding channel selection unit 150 and the electrode array 111, the first channel selection switch of the channel selection unit is correspondingly connected to the first electrode unit of the electrode array, the second channel selection switch of the channel selection unit is connected to the second electrode unit of the electrode array, the third channel selection switch of the channel selection unit is connected to the third electrode unit of the electrode array, and the fourth channel selection switch of the channel selection unit is connected to the fourth electrode unit of the electrode array.
It should be noted that the composition of the electrode units 113 in the electrode array 111 is not limited, and each electrode array 111 may include vertically arranged electrode units 113 as shown in fig. 2, and may also include horizontally arranged electrode units 113, which is not limited herein.
In operation, the operating state of the touch display device 100 may include a display state and a touch state. When the touch display device 100 is in the display state, the touch display chip 130 is configured to control each channel selection switch 151 of each channel selection unit 150 to be in the on state, and load the common electrode signal to the electrode unit 113 connected to each channel selection switch 151. When the touch display device 100 is in the touch state, the touch display chip 130 is configured to select a target channel selection switch from each channel selection unit 150, control the target channel selection switch to be in the on state, and load a touch detection signal to the electrode unit 113 that is in conduction with the target channel selection switch.
A signal source for generating a touch detection signal inside the touch display chip 130 may be used as the touch module 131, and a signal source for generating a common electrode signal may be used as the display module 133. The touch module 131 and the display module 133 are respectively connected to the channel selection units 150.
In the above process, when the touch display device 100 is in the touch state, the touch display chip 130 sequentially controls the target channel selection switch in each channel selection unit 150 to be turned on, and the touch module 131 loads the touch detection signal to the electrode unit 113 connected to the target channel selection switch through the target channel selection switch.
Each channel selection switch 151 is used as a target channel selection switch in turn, the target channel selection switch refers to the electrode unit 113 connected with the channel selection switch, and touch detection is performed immediately/currently, and the target channel selection switch is not limited to the channel selection switch 151.
For example, the touch stage may include four selection periods, and in the first selection period, the touch display chip 130 selects the first channel selection switch as the target channel selection switch to control the first channel selection switch to be turned on, so as to control the first electrode unit to be electrically connected to the touch module 131 and apply the touch detection signal to the first electrode unit. The touch display chip 130 sequentially selects the second channel selection switch, the third channel selection switch, and the fourth channel selection switch as the target channel selection switch in a subsequent selection period, so that the touch detection signal can be loaded to each electrode unit 113 in turn.
After the touch detection signal is loaded, a touch operation performed by a user on the touch display device 100 may cause a change in the touch detection signal. The touch display chip 130 may obtain the touch information of the user according to the change of the touch detection signal and the electrode unit 113 currently loaded with the touch detection signal.
Based on the above design, the touch display device 100 provided by the present application has at least the following advantages:
1. the N electrode units 113 form an electrode array 111, and the number of the channel selection units 150 is equal to the number of the electrode array 111, and is 1/N of the number of the electrode units 113. The touch display chip 130 is connected to each electrode unit 113 through the channel selection unit 150, so that a lead circuit between the touch display chip 130 and the electrode unit 113 is simplified, and the integration level of the touch display device 100 is improved. Meanwhile, since the lead circuit between the touch display chip 130 and the electrode unit 113 is often disposed in the frame area of the touch display device 100, simplifying the lead circuit between the touch display chip 130 and the electrode unit 113 can reduce the frame size of the touch display device 100 at the same time.
2. The touch display chip 130 can control the on/off state of each channel selection switch 151 and load different signals to each electrode unit 113 to replace the MUX arranged inside the touch display chip 130 in the prior art, so that the MUX does not need to be arranged in the touch display chip 130, and the touch module 131 can be directly connected with the channel selection unit 150, thereby reducing the size of the touch display chip 130. Meanwhile, the touch display chip 130 is connected to each electrode unit 113 through the channel selection unit 150, so that the number of pins of the touch display chip 130 is reduced, and the size of the touch display chip 130 is reduced.
3. The touch display chip 130 can control each channel selection switch 151 to be in a conducting state, and each channel selection unit 150 of the display module 133 loads a common electrode signal to each electrode unit 113. The situation that the display module 133 must be connected to each electrode unit 113 due to the functional limitation of the MUX is avoided, the internal circuit of the touch display chip 130 is simplified, and the size of the touch display chip 130 is reduced.
4. The channel selection unit 150 may be directly formed of a transistor and integrated on the first substrate 110 without an additional occupied area. The transistor can be one or more combinations of a bipolar transistor and a field effect transistor.
Further, please refer to fig. 3, fig. 3 is a schematic structural diagram of a channel selection unit 150 according to the present application. As shown in fig. 3, the channel selection switch 151 may be formed of a field effect transistor, and the channel selection unit 150 includes a control terminal 150c, an input terminal 150a, and an output terminal 150 b.
The sources S of the respective field effect transistors are connected to each other to form the output terminal 150b of the channel selection unit 150, the drains D of the respective field effect transistors form the input terminal 150a of the channel selection unit 150, and the gates G of the respective field effect transistors form the control terminal 150c of the channel selection unit 150.
It should be noted that the source S and the drain D of the field effect transistor may be interchanged. The drains D of the respective field effect transistors may also be connected to each other to form the output terminal 150b of the channel selection unit 150, and the sources S of the respective field effect transistors may also form the input terminal 150a of the channel selection unit 150.
Specifically, the output end 150b of each channel selection unit 150 is connected to the touch display chip 130, and the input end 150a of each channel selection unit 150 is connected to each electrode unit 113 of the electrode array 111 corresponding to the channel selection unit 150.
Optionally, as an embodiment, the control terminal 150c of each channel selection unit 150 may be connected to the touch display chip 130 at the same time, and the touch display chip 130 controls the control terminal 150c of each channel selection unit 150. As another embodiment, the control terminal 150c of each channel selection unit 150 may be simultaneously connected to the array substrate row driving circuit 173, and the array substrate row driving circuit 173 controls the control terminal 150c of each channel selection unit 150.
It should be noted that, the connection of the control terminals 150c of the channel selection units 150 to the touch display chip 130 at the same time may mean that pins at the same positions in the control terminals 150c of the channel selection units 150 are connected to each other and then connected to pins of the touch display chip 130, for example, pins (gates G of field effect transistors) corresponding to the first channel selection switches in the control terminals 150c of the channel selection units 150 may be connected to each other first, and then the connected pins are connected to the touch display chip 130 or the array substrate row driving circuit 173.
When the touch display device 100 is in a working state, the touch display chip 130 may apply a turn-on voltage to the gate G of the target field effect transistor in the control terminal 150c of the channel selection unit 150, that is, the source S and the drain D of the field effect transistor are turned on, and then apply a specific signal to the drain D of the target field effect transistor, that is, the electrode unit 113 connected to the target field effect transistor is in a specific working state.
Based on the above design, the control rule of the field effect transistor is simple, and the control circuit of the channel selection unit 150 formed of the field effect transistor is easy to design.
Referring to fig. 4, the touch display device 100 may further include a switch decoder 171 electrically connected to each of the channel selecting units 150, and the switch decoder 171 includes a control terminal 171b and an output terminal 171 a.
The control terminal 171b of the switch decoder 171 is used for receiving the round selection signal, and the output terminal 171a of the switch decoder 171 is connected to the control terminal 150c of each channel selection unit 150.
The switch decoder 171 is configured to select a target channel selection switch from the respective channel selection switches 151 of each channel selection unit 150 according to a round selection signal, and apply a turn-on voltage to the gate G of the target channel selection switch to turn on the target channel selection switch.
For example, the round selection signal may be a binary digital signal, and when the round selection signal is 00, the switch decoder 171 applies a turn-on voltage to the first channel selection switch of each channel selection unit 150. When the round selection signal is 01, the switch decoder 171 applies the turn-on voltage to the second channel selection switch of each channel selection unit 150. When the round selection signal is 10, the switch decoder 171 applies the turn-on voltage to the third channel selection switch of each channel selection unit 150. When the round selection signal is 11, the switch decoder 171 applies the turn-on voltage to the fourth channel selection switch of each channel selection unit 150.
Based on the above design, the touch display chip 130 does not need to directly control the control terminal 150c of the channel selection unit 150, thereby further reducing the number of pins of the touch display chip 130, and thus reducing the volume of the touch display chip 130 itself, especially when the number of the channel selection switches 151 in the channel selection unit 150 is large, the number of pins of the touch display chip 130 can be greatly reduced, and at the same time, the application circuit of the touch display chip 130 is simplified, and the volume of the touch display device 100 is further reduced.
Alternatively, in consideration of the working state of the electrode unit 113 in the display stage, please continue to refer to fig. 4, the switch decoder 171 may further include a state terminal 171c, and the state terminal 171c of the switch decoder 171 is used for receiving the all-select signal.
The switch decoder 171 is further configured to apply an on-voltage to the gate G of each channel selection switch 151 of each channel selection unit 150 according to the all-select signal, so as to turn on each channel selection switch 151 of each channel selection unit 150.
For example, in the display stage, the all-select signal may be "1", and the switch decoder 171 may apply the turn-on voltage to the gate G of the respective channel selection switch 151 of each channel selection unit 150 according to the all-select signal of "1". In the touch phase, the all-select signal may be "0", and the switch decoder 171 applies a turn-on voltage to the gate G of the target channel selection switch of each channel selection unit 150 according to the all-select signal and the round-select signal of "0".
Based on the above design, a driving circuit of the channel selection switch 151 does not need to be separately designed in the display stage, and the integration level of the touch display device 100 provided by the present application is further improved.
Optionally, the full selection signal and the round selection signal may be generated by the touch display chip 130, or may be generated by the array substrate row driving circuit 173.
Specifically, referring to fig. 4, the touch display device 100 may further include an array substrate row driving circuit 173, and the array substrate row driving circuit 173 is connected to the switch decoder 171 and the touch display chip 130, respectively.
The array substrate row driving circuit 173 is configured to generate a full selection signal and a round selection signal according to the working signal of the touch display chip 130, send the full selection signal to the switch decoder through the control terminal 171b of the switch decoder 171, and send the round selection signal to the switch decoder through the status terminal 171c of the switch decoder 171.
The working signal of the touch display chip 130 may be a clock signal.
The touch display device 100 provided by the present application can be applied to an LCD display device, an OLED display device, and the like.
As an embodiment, when the touch display device 100 is applied to an LCD display device, the touch display device 100 provided in the present application further includes a second substrate, a liquid crystal layer, and a pixel array. The first substrate 110 is disposed opposite to the second substrate, and the second substrate includes a plurality of color filter arrays; the pixel array may be disposed on the first substrate 110 and electrically connected to the touch display chip 130; the liquid crystal layer may be disposed between the first substrate 110 and the second substrate.
In the display stage, the touch display chip is used for loading image signals to the pixel array, so that an electric field is formed between the pixel array and the electrode array 111 to drive liquid crystal molecules in the liquid crystal layer to rotate.
Alternatively, the pixel array may be formed of thin film transistors. When the first substrate 110 is etched, the pixel array and the channel selection unit 150 may be simultaneously formed on the first substrate 110.
Specifically, when the first substrate 110 is generated, a metal Film layer and a semiconductor Film layer need to be stacked on a substrate material (pixel glass), and the metal Film layer and the semiconductor Film layer are etched to form a Thin Film Transistor (TFT) array, and the TFT array is used as a pixel array. The inventors of the present application consider that the channel selection unit 150 composed of the field effect transistor can also be formed in the same manner, and thus the pixel array and the channel selection unit 150 can be simultaneously formed on the first substrate 110 by designing an exposure pattern when etching the first substrate 110.
Based on the above design, in the process of etching the first substrate 110, the channel selection unit 150 is directly integrated on the first substrate 110, which reduces the process difficulty in actual production.
As another embodiment, when the touch display device 100 is applied to an OLED display device, the touch display device 100 provided in the present application may further include a second substrate disposed opposite to the first substrate 110, wherein the second substrate is provided with a plurality of LED light emitting arrays electrically connected to the touch display chip 130.
When the touch display device 100 is in a display state, the first substrate 110 may serve as a metal cathode of the LED light emitting array, and the touch display chip 130 loads a display signal to the LED light emitting array, so that the LED light emitting array emits display light.
It should be noted that, when the touch display apparatus 100 is applied to an OLED display device, the first substrate 110 may be directly used as a touch layer of the OLED display device and does not participate in displaying.
Referring to fig. 5, the touch display device 100 further includes a driving selection unit 193 and a common driving electrode 191.
The drive selection units 193 correspond to the electrode arrays 111 one by one, and each drive selection unit 193 comprises a drive selection switch 195 connected with each electrode unit 113 in the corresponding electrode array 111; the common driving electrode 191 is electrically connected to each of the driving selection switches 195.
When the touch display device 100 is in a display state, each drive selection switch 195 of each drive selection unit 193 is turned on, and the common electrode is used for loading a common electrode signal to the electrode unit 113; when the touch display device 100 is in a touch state, the driving selection switch 195 of the driving selection unit 193, which is connected to the target channel selection switch, is in an off state.
Alternatively, the driving selection switch 195 may be formed by the above-mentioned field effect transistor, and the touch display device 100 may further include a driving switch decoder 171 electrically connected to the driving selection unit 193.
The inventors of the present application have found that the pin circuit between the electrode unit 113 and the touch display chip 130 can be simplified by changing the shape of the electrode unit 113.
Optionally, each electrode array 111 comprises a plurality of profiled electrode elements, the respective profiled electrode elements of each electrode array 111 forming a rectangular electrode array.
Each electrode array 111 is identical in shape and rectangular.
The irregular electrode unit refers to the electrode unit 113 having a shape other than a rectangle, and for example, the irregular electrode unit may be a triangular electrode unit, a trapezoidal electrode unit, a polygonal electrode unit, or the like. It is only necessary to ensure that each special-shaped electrode unit of each electrode array 111 can form a rectangular electrode array.
Based on the above design, the area of the special-shaped electrode units is larger than that of the conventional rectangular electrode units, so that the number of the electrode units 113 on the first substrate 110 is reduced, and the number of the pins of the touch display chip 130 is reduced.
As an embodiment, referring to fig. 6, the shaped electrode unit may be a triangular electrode unit 115, each electrode array 111 may include two triangular electrode units 115, and the two triangular electrode units 115 of each electrode array 111 are distributed in a central symmetry manner about a central point of the electrode array.
To form a rectangular electrode array, the triangular electrode unit 115 may be shaped as a right triangle.
The area of each triangular electrode unit 115 is larger than the area of the electrode unit 113 shown in fig. 1, so that the number of the electrode units 113 on the first substrate 110 is reduced, and the number of the pins of the touch display chip 130 is reduced.
Alternatively, each triangular electrode unit 115 may be connected to an external control circuit through both side wires of fig. 6.
Alternatively, the first base plate 110 may include a flexible substrate. The circuit can be arranged on a flexible substrate to form a flexible touch display device.
Alternatively, a plurality of triangular electrode units 115 may be connected in parallel to reduce the resistance of a single triangular electrode unit 115. The present application further provides a portable computing terminal, which includes a central chip and the touch display device 100.
The central chip is electrically connected to the touch display device 100, and is configured to control the touch display device 100 to be in a display state or a touch state. When the touch display device 100 is in a display state, the central chip provides an image to be displayed for the touch display device 100; when the touch display device 100 is in a touch state, the central chip records the touch operation information acquired by the touch display device 100 and further analyzes the touch operation information.
Alternatively, the portable computing terminal may be a mobile phone, a tablet computer, a notebook computer, and the like.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
It will be evident to those skilled in the art that the application is not limited to the details of the foregoing illustrative embodiments, and that the present application may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (12)
1. A touch display device, comprising:
the electrode structure comprises a first substrate, a second substrate and a third substrate, wherein a plurality of electrode arrays are arranged on the first substrate, and each electrode array comprises at least one electrode unit;
the channel selection units are integrally arranged on the first substrate, each channel selection unit corresponds to one of the electrode arrays, and each channel selection unit comprises a plurality of channel selection switches which are in one-to-one correspondence connection with each electrode unit in the corresponding electrode array; the touch display chip is electrically connected with the channel selection unit;
when the touch display device is in a display state, the touch display chip is used for controlling each channel selection switch of each channel selection unit to be in a conducting state, and loading a common electrode signal to the electrode unit connected with each channel selection switch; when the touch display device is in a touch state, the touch display chip is used for selecting a target channel selection switch from each channel selection unit, controlling the target channel selection switch to be in a conducting state and loading a touch detection signal to an electrode unit connected with the target channel selection switch through the target channel selection switch;
the touch display device comprises a switch decoder electrically connected with each channel selection unit, and the switch decoder comprises a control end and an output end;
the control end of the switch decoder is used for accessing the alternate selection signal, and the output end of the switch decoder is connected with the control end of each channel selection unit;
the switch decoder is used for selecting a target channel selection switch from each channel selection switch of each channel selection unit according to the alternate selection signal, and loading a conducting voltage on a grid electrode of the target channel selection switch to enable the target channel selection switch to be conducted;
the switch decoder also comprises a state end, and the state end of the switch decoder is used for accessing a full selection signal;
the switch decoder is further configured to apply a turn-on voltage to the gate of each channel selection switch of each channel selection unit according to the all-select signal, so that each channel selection switch of each channel selection unit is turned on.
2. The touch display device according to claim 1, wherein the channel selection unit includes a control terminal, an input terminal, and an output terminal, and the channel selection switch is formed by a field effect transistor;
the source electrodes of the field effect transistors are connected with each other to form the output end of the channel selection unit; the drain electrode of each field effect tube forms the input end of the channel selection unit; the gate of each field effect transistor forms the control terminal of the channel selection unit.
3. The touch display device of claim 1, further comprising an array substrate row driving circuit connected to the switch decoder and the touch display chip, respectively;
the array substrate row driving circuit is used for generating a full selection signal and a wheel selection signal according to a working signal of the touch display chip, sending the full selection signal to the switch decoder through a control end of the switch decoder, and sending the wheel selection signal to the switch decoder through a state end of the switch decoder.
4. The touch display device of claim 2, further comprising:
the second substrate is arranged opposite to the first substrate, and a plurality of color filter arrays are arranged on the second substrate;
a liquid crystal layer disposed between the first and second substrates; the pixel array is electrically connected with the touch display chip and arranged on the first substrate;
when the touch display device is in a display state, the touch display chip is used for loading image signals to the pixel array, so that an electric field is formed between the pixel array and the electrode array to drive liquid crystal molecules in the liquid crystal layer to rotate.
5. The touch display device of claim 4, wherein the pixel array is formed of thin film transistors;
and when the first substrate is etched, the pixel array and the channel selection unit are simultaneously formed on the first substrate.
6. The touch display device according to claim 2, further comprising a second substrate disposed opposite to the first substrate, wherein the second substrate has a plurality of LED light emitting arrays disposed thereon;
the LED light emitting array is electrically connected with the touch display chip;
when the touch display device is in a display state, the first substrate serves as a metal cathode of the LED light emitting array, and the touch display chip loads a display signal to the LED light emitting array so that the LED light emitting array emits display light.
7. The touch display device of claim 1, further comprising:
the channel selection unit comprises a drive selection switch connected with each electrode unit in the corresponding electrode array; and a common driving electrode electrically connected to each of the driving selection switches;
when the touch display device is in a display state, each drive selection switch of each drive selection unit is conducted, and the common electrode is used for loading a common electrode signal to the electrode unit; and when the touch display device is in a touch state, a driving selection switch connected with the target channel selection switch in the driving selection unit is in a closed state.
8. The touch display device of claim 1, wherein each electrode array comprises a plurality of shaped electrode units, and each shaped electrode unit of each electrode array forms a rectangular electrode array.
9. The touch display device of claim 8, wherein the shaped electrode units are triangular electrode units, and the triangular electrode units are identical in shape;
each electrode array comprises two triangular electrode units; for each electrode array, the two triangular electrode units of the electrode array are distributed in central symmetry about the central point of the electrode array.
10. The touch display device according to claim 9, further comprising a frame lead circuit disposed on both sides of the electrode array and connected between the triangular electrode unit and the channel selection switch.
11. The touch display device of claim 1, wherein the first substrate comprises a flexible substrate.
12. A portable computing terminal, characterized in that the portable computing terminal comprises a central chip and a touch display device according to any one of claims 1 to 11;
the central chip is electrically connected with the touch display device and is used for controlling the touch display device to be in a display state or a touch state.
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| CN201910130522.6A CN109901746B (en) | 2019-02-21 | 2019-02-21 | Touch display device and portable computing terminal |
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| CN110718201B (en) * | 2019-10-24 | 2021-09-28 | 厦门骏陆科技有限公司 | Liquid crystal driving chip capable of reducing pin number |
| CN113514673B (en) * | 2021-09-14 | 2022-01-28 | 苏州华兴源创科技股份有限公司 | Touch channel switching circuit, device and detection system |
| CN114265524B (en) * | 2021-12-17 | 2023-08-22 | 武汉华星光电半导体显示技术有限公司 | Display panel |
| CN115856588B (en) * | 2023-02-22 | 2023-08-04 | 长鑫存储技术有限公司 | Chip test board and test method |
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| JP4890010B2 (en) * | 2004-12-06 | 2012-03-07 | 株式会社半導体エネルギー研究所 | Display device and subframe setting method |
| JP5116359B2 (en) * | 2007-05-17 | 2013-01-09 | 株式会社半導体エネルギー研究所 | Liquid crystal display |
| CN101183512B (en) * | 2007-12-19 | 2011-01-05 | 南开大学 | Display screen peripheral integration and control circuit together accomplished LCD array driving method and circuit product |
| CN201259667Y (en) * | 2008-03-03 | 2009-06-17 | 贺伟 | Infrared transmitting or receiving circuit board unit and infrared touch screen |
| CN104699355B (en) * | 2015-04-01 | 2017-11-14 | 上海天马微电子有限公司 | A kind of self-tolerant touch display panel and its array base palte and contactor control device |
| CN105448226B (en) * | 2016-01-12 | 2018-03-16 | 京东方科技集团股份有限公司 | A kind of gate driving circuit and display device |
| CN114115609A (en) * | 2016-11-25 | 2022-03-01 | 株式会社半导体能源研究所 | Display device and working method thereof |
| CN106648249B (en) * | 2016-12-29 | 2019-09-03 | 厦门天马微电子有限公司 | Touch-control display panel and touch control display apparatus |
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