CN111309174A - Embedded touch screen, touch detection method thereof and display device - Google Patents
Embedded touch screen, touch detection method thereof and display device Download PDFInfo
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- CN111309174A CN111309174A CN202010053795.8A CN202010053795A CN111309174A CN 111309174 A CN111309174 A CN 111309174A CN 202010053795 A CN202010053795 A CN 202010053795A CN 111309174 A CN111309174 A CN 111309174A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0412—Digitisers structurally integrated in a display
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- 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
- G02F1/13306—Circuit arrangements or driving methods for the control of single liquid crystal cells
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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
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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
- G06F3/042—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means
- G06F3/0421—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means by interrupting or reflecting a light beam, e.g. optical touch-screen
Abstract
The invention discloses an embedded touch screen, a touch detection method and a display device thereof.A switch transistor is configured to be in a cut-off state in a finger touch mode, an initial state in a laser touch mode is a sub-threshold state, and the sub-threshold state is changed into a conducting state under laser irradiation due to the existence of a filter, so that the signal change on self-capacitance electrodes which are correspondingly coupled with the switch transistors one by one in the finger touch mode and the laser touch mode is different, and the two touch modes of finger touch detection and laser touch detection can be realized. Therefore, the invention provides a novel touch product compatible with finger touch and laser touch.
Description
Technical Field
The invention relates to the technical field of display, in particular to an embedded touch screen, a touch detection method thereof and a display device.
Background
The embedded touch control (Full in cell touch) display technology combines display and touch control into a whole, so that the product is lighter and thinner and has lower cost. Currently, most of embedded touch display products use a self-capacitance type architecture, that is, a display (AA) area includes a plurality of self-capacitance electrodes, a driving chip outputs a square wave signal in a touch time (V-blanking) period to charge the self-capacitance electrodes, and simultaneously detects a signal change of the self-capacitance electrodes, and finally locates a coordinate where touch occurs through operation. However, as mentioned above, the related in-cell touch display product is a more uniform self-contained system architecture, and new touch products are urgently needed to be derived.
Disclosure of Invention
In view of this, embodiments of the present invention provide an embedded touch screen, a touch detection method thereof, and a display device, so as to provide a novel touch product compatible with laser touch and finger touch.
Therefore, an in-cell touch screen provided by an embodiment of the present invention includes: the array substrate and the opposite substrate are oppositely arranged, one side of the array substrate, facing the opposite substrate, is provided with a plurality of switch transistors and a plurality of self-capacitance electrodes which are coupled with the switch transistors in a one-to-one correspondence mode, and one side of the opposite substrate, facing the array substrate, is provided with a black matrix and a filter embedded in the black matrix;
a part of channel regions of the switching transistors are overlapped with the filter, and the rest of the channel regions are overlapped with the black matrix;
the switch transistor is configured to be in a cut-off state in a finger touch mode, and an initial state in a laser touch mode is a sub-threshold state;
the filter is configured to selectively transmit laser light emitted by a laser pen, so that the switch transistor is changed from a subthreshold state to a conducting state under the irradiation of the laser light.
In a possible implementation manner, in the in-cell touch screen provided by the embodiment of the present invention, the black matrix has a mesh structure formed by a plurality of meshes, and the filter is in contact with boundaries of the meshes.
In a possible implementation manner, in the embedded touch screen provided by the embodiment of the invention, each self-capacitance electrode is multiplexed as a common electrode.
In a possible implementation manner, an embodiment of the present invention provides the in-cell touch screen, further including: a touch detection chip;
the touch detection chip is configured to determine a touch position according to a signal change on the self-capacitance electrode in the finger touch mode or the laser touch mode.
Based on the same inventive concept, an embodiment of the present invention further provides a touch detection method for the in-cell touch screen, including:
receiving an instruction for switching to a finger touch mode or a laser touch mode in a touch time period;
in the finger touch mode, controlling the switch transistors to be in a cut-off state, and loading a driving signal to each capacitance electrode so as to judge a finger touch position according to the change of the first signal on each capacitance electrode;
and in the laser touch mode, controlling the initial state of the switch transistor to be a sub-threshold state, enabling the switch transistor to be in a conducting state when being irradiated by laser emitted by a laser pen, and loading the driving signal on each self-capacitance electrode so as to judge the laser touch position according to the change of the second signal on each self-capacitance electrode.
In a possible implementation manner, in the touch detection method provided in an embodiment of the present invention, the controlling the switch transistor to be in an off state specifically includes:
loading a first modulation signal to a gate of the switching transistor, wherein a high level of the first modulation signal is less than 0V, and a low level of the first modulation signal is a turn-off voltage of the switching transistor.
In a possible implementation manner, in the touch detection method provided in an embodiment of the present invention, the controlling the switch transistor to be in the sub-threshold state specifically includes:
and loading a second modulation signal to the grid of the switching transistor, wherein the high level of the second modulation signal is less than 0V, and the low level of the second modulation signal is greater than the low level of the first modulation signal.
In a possible implementation manner, in the touch detection method provided in an embodiment of the present invention, before determining the finger touch position or the laser touch position according to a signal change on each capacitive electrode, the method further includes:
and amplifying the signal change on each self-capacitance electrode.
In a possible implementation manner, in the touch detection method provided in an embodiment of the present invention, the receiving an instruction to switch to the finger touch mode or the laser touch mode specifically includes:
when a signal that the laser pen is opened is received, a laser touch mode is started; and when the signal that the laser pen is closed is received, a finger touch mode is started.
Based on the same inventive concept, an embodiment of the present invention further provides a display device, including: the embedded touch screen is provided.
The invention has the following beneficial effects:
the embodiment of the invention provides an embedded touch screen, a touch detection method and a display device thereof, wherein the embedded touch screen comprises the following steps: the array substrate and the opposite substrate are oppositely arranged, one side of the array substrate, which faces the opposite substrate, is provided with a plurality of switch transistors and a plurality of self-capacitance electrodes which are coupled with the switch transistors in a one-to-one correspondence mode, and one side of the opposite substrate, which faces the array substrate, is provided with a black matrix and a filter embedded into the black matrix; part of channel regions of the switch transistors are mutually overlapped with the filter, and the rest of channel regions are mutually overlapped with the black matrix; a switching transistor configured to be in an off state in a finger touch mode, and an initial state in a laser touch mode is a sub-threshold state; and the filter is configured to selectively transmit laser emitted by the laser pen, so that the switching transistor is changed from the subthreshold state to the conducting state under the irradiation of the laser. The switch transistors are configured to be in an off state in the finger touch mode, the initial state in the laser touch mode is a sub-threshold state, and the sub-threshold state is changed into an on state under laser irradiation due to the existence of the filter, so that signal changes on self-capacitance electrodes which are correspondingly coupled with the switch transistors one by one in the finger touch mode and the laser touch mode are different, and the finger touch detection mode and the laser touch detection mode can be realized. Therefore, the invention provides a novel touch product compatible with finger touch and laser touch.
Drawings
FIG. 1 is a schematic diagram of an embedded touch screen according to an embodiment of the invention;
FIG. 2 is a flowchart illustrating a touch detection method of an in-cell touch screen according to an embodiment of the present invention;
FIG. 3 is a timing diagram illustrating operation of an in-cell touch screen according to the related art;
FIG. 4 is a timing diagram illustrating operation of an in-cell touch screen according to an embodiment of the present invention;
fig. 5 is a schematic view illustrating a working principle of an in-cell touch screen according to an embodiment of the present invention in a finger touch mode;
fig. 6 is a schematic view illustrating a working principle of an in-cell touch screen in a laser touch mode according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. The thicknesses and shapes of the various film layers in the drawings are not to be considered true proportions, but are merely illustrative of the present disclosure. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the invention.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the description and in the claims does not indicate any order, quantity, or importance, but rather is used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. "inner", "outer", "upper", "lower", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
An in-cell touch screen provided by an embodiment of the present invention, as shown in fig. 1, includes: the array substrate 001 and the opposite substrate 002 are oppositely arranged, one side of the array substrate 001 facing the opposite substrate 002 is provided with a plurality of switching transistors 101 and a plurality of self-capacitance electrodes 102 coupled with the switching transistors 101 in a one-to-one correspondence manner, and one side of the opposite substrate 002 facing the array substrate 001 is provided with a black matrix 201 and a filter 202 embedded in the black matrix 201;
specifically, each switching transistor 101 includes a gate 1011, a source 1012, a drain 1013, and an active layer 1014, the active layer 1014 including a first contact region contacting the source 1012, a second contact region contacting the drain 1013, and a channel region between the first contact region and the second contact region;
a part of the channel region of each switching transistor 101 overlaps with the filter 202, and the remaining part of the channel region overlaps with the black matrix 201;
a switching transistor 101 configured to be in an off state in the finger touch mode, and an initial state in the laser touch mode is a subthreshold state;
and a filter 202 configured to selectively transmit laser light emitted from the laser pen so that the switching transistor 101 is changed from the subthreshold state to the conductive state by the laser irradiation.
In the in-cell touch screen provided by the embodiment of the invention, the switch transistors 101 are configured to be in an off state in the finger touch mode, the initial state in the laser touch mode is a sub-threshold state, and the sub-threshold state is changed to an on state under laser irradiation due to the existence of the filter, so that the signal changes on the self-capacitance electrodes 102 coupled with the switch transistors 101 in a one-to-one correspondence manner are different in the finger touch and laser touch modes, and thus two touch modes of finger touch detection and laser touch detection can be realized. Therefore, the invention provides a novel touch product compatible with finger touch and laser touch.
Note that the fact that the filter 202 is embedded in the black matrix 201 means that a part of the black matrix 201 in the related art is changed to the filter 202 so as to secure the aperture ratio of the product. In addition, the selection of the filter 202 needs to be matched with the laser wavelength emitted by the laser pen, i.e. only the laser emitted by the laser pen can pass through, but the filter has poor transmittance to visible light, so as to ensure that the leakage current of the switching transistor 101 is not increased abnormally under the irradiation of common external visible light. Wherein, the common laser pen can be selected from red light, green light, blue-violet light and the like. In the present invention, only one laser pointer with a fixed wavelength range is selected and the filter 202 matched with the selected laser pointer is selected.
In addition, the size relationship and the relative position relationship between the channel region portion of each switching transistor 101 overlapping the filter 202 and the remaining portion of the channel region overlapping the black matrix 201 may be specifically set according to an actually required touch effect and a light shielding effect of the black matrix 201 on the channel region.
Alternatively, in the in-cell touch screen provided in the embodiment of the present invention, the black matrix 201 has a mesh structure formed by a plurality of meshes, and the filter 202 is in contact with the boundaries of the meshes. Generally, in the related design, the black matrix 201 generally completely covers the channel region to ensure good coverage of the channel region and avoid the influence of external light on the channel region. In the present invention, by contacting the filter 202 with the grid boundary of the black matrix 201, that is, disposing the filter 202 in the edge area of the black matrix 201, the product fabrication is facilitated.
Optionally, in the in-cell touch screen provided in the embodiment of the present invention, in order to realize a light and thin design of a product, the respective capacitive electrodes 102 are multiplexed as a common electrode.
Optionally, in the in-cell touch screen provided in the embodiment of the present invention, the in-cell touch screen may further include: a touch detection chip;
and the touch detection chip is configured to judge a touch position according to the signal change on the self-capacitance electrode in a finger touch mode or a laser touch mode. In addition, in the present invention, since the self-capacitance electrode 102 and the common electrode are multiplexed, the touch detection chip is generally used to load the common voltage signal (V) to the self-capacitance electrode 102 during the display time periodcom) To drive the liquid crystal to deflect and realize the display function.
In addition, as shown in fig. 1, in the in-cell touch screen provided in the embodiment of the present invention, the in-cell touch screen may further include: a substrate 103, a gate insulating layer 101 between the gate electrode 1011 and the active layer 1014, a pixel electrode 105 electrically connected to the transistor 101, and an insulating layer 106 between the pixel electrode 105 and the self-capacitance electrode 102. The functions and fabrication of these layers are the same as those of the related art, and are not described herein.
Based on the same inventive concept, embodiments of the present invention further provide a touch detection method for the in-cell touch screen, and the touch detection method has the same principle as the in-cell touch screen provided by the embodiments of the present invention for solving the problem, so that the implementation of the touch detection method can refer to the implementation of the in-cell touch screen, and repeated details are not repeated.
Specifically, the touch detection method of the in-cell touch screen provided by the embodiment of the present invention, as shown in fig. 2, includes the following steps:
s1, receiving an instruction for switching to a finger touch mode or a laser touch mode in a touch time period;
s2, in the finger touch mode, controlling the switch transistor to be in a cut-off state, and loading a driving signal to each capacitance electrode so as to judge the finger touch position according to the first signal change on each capacitance electrode;
and S3, in the laser touch mode, controlling the initial state of the switch transistor to be a sub-threshold state, enabling the switch transistor to be in a conducting state when being irradiated by laser emitted by the laser pen, and loading a driving signal to each capacitor electrode so as to judge the laser touch position according to the change of the second signal on each capacitor electrode.
In order to reduce the mutual coupling effect of different traces in the related design, when the touch detection chip outputs a square wave signal in a touch time period, a frame Start (STV) signal, a signal on a Gate line (Gate), and a signal on a data line (Source) also output a square wave at the same time, which are referred to as modulation signals herein. Specifically, as shown in fig. 3, the Gate signal is a square wave based on the turn-off Voltage (VGL) of the switching transistor 101, so as to ensure that the Gate is always at a lower potential during the touch time period, thereby preventing the generation of the leakage current (loff) of the transistor 101. In the present invention, as shown in fig. 4, the STV signal and the Gate signal are adjusted to be square-wave based on VGL ', VGL' > VGL, but the maximum value of the square-wave is not more than 0V, so as to ensure that the transistor 101 can still work in the subthreshold region under the condition of no laser, i.e. the leakage current can still be in a slightly small state, but when laser irradiates the channel region through the filter 202, carriers in the channel region increase, Ioff increases, and the TFT is in weak conduction. Finally, the transistor 101 can be turned on weakly when being irradiated by specific light by adjusting the voltage of the modulation signal, so that the touch detection chip receives the signal change of the self-capacitance electrode 102, and the identification of the touch action of the laser pen is realized.
Based on this, in the touch detection method provided in the embodiment of the present invention, controlling the switch transistor to be in the off state may specifically be implemented by the following steps:
and loading a first modulation signal to the grid electrode of the switching transistor, wherein the high level of the first modulation signal is less than 0V, and the low level of the first modulation signal is the turn-off voltage VGL of the switching transistor.
Optionally, in the touch detection method provided in the embodiment of the present invention, controlling the switch transistor to be in the sub-threshold state may specifically be implemented by the following steps:
and loading a second modulation signal to the grid of the switching transistor, wherein the high level of the second modulation signal is less than 0V, and the low level of the second modulation signal is greater than the low level of the first modulation signal. Specifically, the low level of the second modulation signal is VGL' described above.
Optionally, in the touch detection method provided in the embodiment of the present invention, before the step of executing determines the finger touch position or the laser touch position according to the signal change on the respective capacitive electrode, the following steps may be further executed:
the signal changes on the respective capacitive electrodes are amplified.
By amplifying the signal change in the two touch modes according to the signal change condition on the respective capacitive electrode, a good touch effect can be obtained in the two touch modes. And the amplification factor is generally adjusted and set according to the touch effect and the matching of the whole machine. Specifically, before the product leaves the factory, specific test software is used for testing the magnitude of the signal quantity when touch occurs according to the actual touch effect (namely, the signal quantity) in the two modes, and the magnitude of the signal quantity is compared with a threshold value, if the signal quantity is too small to be close to the threshold value, a ' false ' touch occurs, and if the signal quantity is too large, the operation of the amplifier is close to a saturation region, and no ' touch occurs. Therefore, it needs to be verified through experiments, and finally a proper semaphore is obtained, i.e. a proper amplification factor is obtained. In the actual use process, the amplification factors in the two touch modes are both corresponding fixed values.
Optionally, in the touch detection method provided in the embodiment of the present invention, receiving an instruction to switch to the finger touch mode or the laser touch mode may be specifically implemented by the following steps:
when a signal that the laser pen is opened is received, a laser touch mode is started; and when a signal that the laser pen is closed is received, the finger touch mode is started.
In order to better understand the technical solution of the touch detection method provided by the present invention, the following detailed description will be made.
And in the touch time period, when a signal of closing the laser pen is received, the finger touch mode is started. As shown in fig. 3 and fig. 5, the Gate voltage is close to VGL, so that the transistor (TFT)101 is turned off, the square wave of the modulation signal on the Source trace cannot be loaded, and the pixel capacitor CpThe charge on the capacitor remains substantially unchanged. At this time, the Analog Front End (AFE) circuit of the touch detection chip (TDDI IC) is supplied with electricity from the multiplexer (Mux)Touch (Touch) capacitor C formed by capacitor electrode 102 and groundbOutputting the high level of the first modulation signal (the high level is less than 0V) to the touch capacitor CbCharging; an AFE circuit of the touch detection chip supplies a touch capacitor C through a Mux circuitbWhen the low level of the first modulation signal is outputted (the low level is VGL), the touch capacitor CbGive touch-control and detect chip internal capacitance CfDischarging, the touch sensing chip passes through the internal capacitor CfAnd detecting and amplifying the change of the electric charge amount brought by the finger touch to judge the touch position of the finger.
And in the touch time period, when a signal for opening the laser pen is received, starting a laser touch mode. As shown in fig. 4 and 6, the Gate voltage is close to VGL', so that the TFT operates in the sub-threshold rear region, and when the laser penetrates through the filter 202 and irradiates the channel region, carriers increase in the channel region, Ioff increases, and the TFT is weakly turned on. Modulation signal on Source wire to pixel capacitance CpCharging, pixel capacitance CpChanges the state of the common electrode multiplexed as the self-capacitance electrode 102, and the touch capacitance CbThe amount of charge of. The AFE circuit of the touch detection chip supplies a touch capacitor C formed by the self-capacitance electrode 102 and the ground through the Mux circuitbOutputting the high level of the second modulation signal (the high level is less than 0V) to the touch capacitor CbCharging; an analog front end AFE circuit of the touch detection chip supplies the touch capacitor C through the Mux circuitbWhen the low level of the second modulation signal is outputted (the low level is VGL'), the touch capacitor CbGive touch-control and detect chip internal capacitance CfDischarging, the touch sensing chip passes through the internal capacitor CfAnd detecting and amplifying the change of the electric charge amount brought by the laser touch control to judge the laser touch control position.
Based on the same inventive concept, an embodiment of the present invention further provides a display device, including the in-cell touch screen provided in the embodiment of the present invention, where the display device may be: any product or component with a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator, an intelligent watch, a fitness wrist strap, and a personal digital assistant. Since the principle of the display device for solving the problems is the same as that of the in-cell touch screen, the display device can be implemented according to the embodiment of the in-cell touch screen, and repeated details are not repeated.
The embedded touch screen, the touch detection method and the display device provided by the embodiment of the invention comprise the following steps: the array substrate and the opposite substrate are oppositely arranged, one side of the array substrate, which faces the opposite substrate, is provided with a plurality of switch transistors and a plurality of self-capacitance electrodes which are coupled with the switch transistors in a one-to-one correspondence mode, and one side of the opposite substrate, which faces the array substrate, is provided with a black matrix and a filter embedded into the black matrix; part of channel regions of the switch transistors are mutually overlapped with the filter, and the rest of channel regions are mutually overlapped with the black matrix; a switching transistor configured to be in an off state in a finger touch mode, and an initial state in a laser touch mode is a sub-threshold state; and the filter is configured to selectively transmit laser emitted by the laser pen, so that the switching transistor is changed from the subthreshold state to the conducting state under the irradiation of the laser. The switch transistors are configured to be in an off state in the finger touch mode, the initial state in the laser touch mode is a sub-threshold state, and the sub-threshold state is changed into an on state under laser irradiation due to the existence of the filter, so that signal changes on self-capacitance electrodes which are correspondingly coupled with the switch transistors one by one in the finger touch mode and the laser touch mode are different, and the finger touch detection mode and the laser touch detection mode can be realized. Therefore, the invention provides a novel touch product compatible with finger touch and laser touch.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. An in-cell touch screen, comprising: the array substrate and the opposite substrate are oppositely arranged, one side of the array substrate, facing the opposite substrate, is provided with a plurality of switch transistors and a plurality of self-capacitance electrodes which are coupled with the switch transistors in a one-to-one correspondence mode, and one side of the opposite substrate, facing the array substrate, is provided with a black matrix and a filter embedded in the black matrix;
a part of channel regions of the switching transistors are overlapped with the filter, and the rest of the channel regions are overlapped with the black matrix;
the switch transistor is configured to be in a cut-off state in a finger touch mode, and an initial state in a laser touch mode is a sub-threshold state;
the filter is configured to selectively transmit laser light emitted by a laser pen, so that the switch transistor is changed from a subthreshold state to a conducting state under the irradiation of the laser light.
2. The in-cell touch screen of claim 1, wherein the black matrix has a mesh structure of a plurality of cells, and the filter is in contact with a boundary of the cells.
3. The in-cell touch screen of claim 1, wherein each of the self-capacitance electrodes is multiplexed into a common electrode.
4. The in-cell touch screen of any of claims 1-3, further comprising: a touch detection chip;
the touch detection chip is configured to determine a touch position according to a signal change on the self-capacitance electrode in the finger touch mode or the laser touch mode.
5. The touch detection method of the in-cell touch screen according to any one of claims 1 to 4, comprising:
receiving an instruction for switching to a finger touch mode or a laser touch mode in a touch time period;
in the finger touch mode, controlling the switch transistors to be in a cut-off state, and loading a driving signal to each capacitance electrode so as to judge a finger touch position according to the change of the first signal on each capacitance electrode;
and in the laser touch mode, controlling the initial state of the switch transistor to be a sub-threshold state, enabling the switch transistor to be in a conducting state when being irradiated by laser emitted by a laser pen, and loading the driving signal on each self-capacitance electrode so as to judge the laser touch position according to the change of the second signal on each self-capacitance electrode.
6. The touch detection method according to claim 5, wherein controlling the switching transistor to be in an off state specifically includes:
loading a first modulation signal to a gate of the switching transistor, wherein a high level of the first modulation signal is less than 0V, and a low level of the first modulation signal is a turn-off voltage of the switching transistor.
7. The touch detection method according to claim 6, wherein the controlling the switching transistor in the subthreshold state specifically comprises:
and loading a second modulation signal to the grid of the switching transistor, wherein the high level of the second modulation signal is less than 0V, and the low level of the second modulation signal is greater than the low level of the first modulation signal.
8. The touch detection method according to any one of claims 5 to 7, further comprising, before determining the finger touch position or the laser touch position according to a change in a signal on each of the capacitive electrodes:
and amplifying the signal change on each self-capacitance electrode.
9. The touch detection method according to any one of claims 5 to 7, wherein the receiving of the instruction to switch to the finger touch mode or the laser touch mode specifically includes:
when a signal that the laser pen is opened is received, a laser touch mode is started; and when the signal that the laser pen is closed is received, a finger touch mode is started.
10. A display device, comprising: the in-cell touch screen of any of claims 1-4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010053795.8A CN111309174B (en) | 2020-01-17 | 2020-01-17 | Embedded touch screen, touch detection method thereof and display device |
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| CN202010053795.8A CN111309174B (en) | 2020-01-17 | 2020-01-17 | Embedded touch screen, touch detection method thereof and display device |
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| CN111309174A true CN111309174A (en) | 2020-06-19 |
| CN111309174B CN111309174B (en) | 2023-05-30 |
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| CN112255830A (en) * | 2020-10-23 | 2021-01-22 | 深圳市华星光电半导体显示技术有限公司 | Laser induction panel, manufacturing method thereof and display device |
| CN112764572A (en) * | 2021-01-07 | 2021-05-07 | 深圳市华星光电半导体显示技术有限公司 | Display device and display device control driving method |
| CN112947787A (en) * | 2021-02-23 | 2021-06-11 | 北京京东方显示技术有限公司 | Touch panel, display device, display system and touch method |
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| CN111309174B (en) | 2023-05-30 |
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