Touch anti-peeping screen and control method

Abstract

The present invention provides a touch anti-peeping screen and a control method. The touch anti-peeping screen includes a dimming liquid crystal cell and a touch display driving module. The dimming liquid crystal cell includes a first substrate, a second substrate, a second liquid crystal layer, a touch sensing layer, and a common electrode. The touch sensing layer is provided with a plurality of electrode blocks arranged in an array; the touch display driving module includes a plurality of source channels and a plurality of touch channels. The plurality of source channels and the plurality of touch channels are respectively connected to the plurality of electrode blocks through touch traces. The plurality of source channels output an alternating voltage signal for wide and narrow viewing angle mode switching during non-touch time periods, and are in a Hi-Z state and output a corresponding voltage during touch time periods. The plurality of touch channels are in a Hi-Z state and output a corresponding voltage during non-touch time periods, and output a touch detection voltage signal during touch time periods. By providing voltage for the electrode blocks through the touch display driving module, the functions of wide and narrow viewing angle mode switching and touch can be realized simultaneously, thereby correspondingly reducing the manufacturing process and cost.

Description

Technical Field

[0001] The present invention relates to the field of touch displays, and particularly to a touch anti-peeping screen and a control method therefor. Background Art

[0002] With the development of the information age, the application of display screens has become increasingly broad and diversified, and display screens with touch functions have become increasingly popular. In recent years, people have paid more and more attention to personal privacy protection. At present, most display devices (such as mobile phones and laptops) use a wide viewing angle mode for display, without anti-peeping effect, which causes many inconveniences in public places. Based on market trends, there is an increasing demand for touch screens with anti-peeping effects.

[0003] Currently, to achieve the touch function of a touch anti-peeping screen, an external TP method or an OnCell method is generally used. If the external TP method is adopted, it is necessary to separately manufacture a touch sensing layer and a liquid crystal cell, then bond the touch sensing layer and the liquid crystal cell through an optical adhesive, and finally attach a cover plate. That is, the external TP method requires a secondary bonding process, with low yield and high cost. If the OnCell method is adopted, it is necessary to separately manufacture a liquid crystal cell, and then perform multiple coatings on the light-emitting side of the liquid crystal cell, that is, a touch sensing layer is formed on the light-emitting side of the liquid crystal cell, and finally a cover plate is attached. Reference can be made to Figure 1 , Figure 1 which is a partial structural schematic diagram of an existing touch anti-peeping screen. The touch anti-peeping screen includes a display liquid crystal cell 100 for realizing image display, a dimming liquid crystal cell 200 for realizing the switching between narrow and wide viewing angle modes, and a touch sensing layer 300 for realizing the touch function. That is, after the dimming liquid crystal cell 200 is manufactured, the touch sensing layer 300 needs to be deposited on the dimming liquid crystal cell 200, with a complex process, many photomasks and high cost. Summary of the Invention

[0004] In view of this, the present invention provides a touch anti-peeping screen and a control method therefor, which can realize the switching between narrow and wide viewing angle modes and the touch function, and correspondingly reduce the process and cost.

[0005] An embodiment of the present invention provides a touch anti-peeping screen, which includes a display liquid crystal cell. The display liquid crystal cell includes an array substrate, a color filter substrate disposed opposite to the array substrate, and a first liquid crystal layer located between the array substrate and the color filter substrate. It further includes a dimming liquid crystal cell and a touch display driving module. The dimming liquid crystal cell includes a first substrate, a second substrate disposed opposite to the first substrate, and a second liquid crystal layer located between the first substrate and the second substrate. A touch sensing layer is provided on a side of the first substrate facing the second liquid crystal layer. The touch sensing layer is provided with a plurality of electrode blocks arranged in an array. The plurality of electrode blocks are used to control the switching between wide and narrow viewing angle modes and touch sensing. A common electrode is provided on a side of the second substrate facing the second liquid crystal layer, and a DC common voltage is applied to the common electrode. The touch display driving module includes a plurality of source channels and a plurality of touch channels paired with the plurality of source channels. The plurality of source channels and the plurality of touch channels of the touch display driving module are respectively connected to the plurality of electrode blocks through touch traces. Wherein, the plurality of source channels of the touch display driving module output an AC voltage signal for switching between wide and narrow viewing angle modes during non-touch time periods, and are in a Hi-Z state and output a corresponding voltage during touch time periods. The plurality of touch channels of the touch display driving module are in a Hi-Z state and output a corresponding voltage during non-touch time periods, and output a touch detection voltage signal during touch time periods.

[0006] Specifically, an insulating layer is provided between the touch sensing layer and the touch traces. The plurality of electrode blocks are electrically connected to the touch traces through a plurality of contact holes provided on the insulating layer.

[0007] Specifically, the plurality of source channels and the plurality of touch channels of the touch display driving module are arranged at intervals in the same direction.

[0008] Specifically, every two of the plurality of source channels and the plurality of touch channels of the touch display driving module are sequentially paired and connected, and are respectively connected to the plurality of electrode blocks through the touch traces.

[0009] Specifically, the plurality of odd-numbered source channels and the plurality of odd-numbered touch channels of the touch display driving module are paired and connected, and are respectively connected to the plurality of electrode blocks through the touch traces.

[0010] An embodiment of the present invention further provides a control method for a touch anti-peeping screen, which is used to control the touch anti-peeping screen as described above, and includes: applying a DC common voltage to the common electrode; when it is necessary to switch the touch anti-peeping screen to the first viewing angle mode, providing first pure grayscale image data to the touch display driving module; a plurality of source channels of the touch display driving module output a first AC voltage signal to a plurality of the electrode blocks during a non-touch time period, and are in a Hi-Z state and output corresponding voltages during a touch time period, wherein the first AC voltage signal is a frame-inverted grayscale voltage signal generated according to the first pure grayscale image data; a plurality of touch channels of the touch display driving module are in a Hi-Z state and output corresponding voltages during a non-touch time period, and output the touch detection voltage signal to a plurality of the electrode blocks during a touch time period; when it is necessary to switch the touch anti-peeping screen to the second viewing angle mode, providing second pure grayscale image data to the touch display driving module; a plurality of source channels of the touch display driving module output a second AC voltage signal to a plurality of the electrode blocks during a non-touch time period, and are in a Hi-Z state and output corresponding voltages during a touch time period, wherein the second AC voltage signal is a frame-inverted grayscale voltage signal generated according to the second pure grayscale image data; a plurality of touch channels of the touch display driving module are in a Hi-Z state and output corresponding voltages during a non-touch time period, and output the touch detection voltage signal to a plurality of the electrode blocks during a touch time period.

[0011] Specifically, the step of providing first pure grayscale image data to the touch display driving module when it is necessary to switch the touch anti-peeping screen to the first viewing angle mode includes: determining a first grayscale voltage according to the voltage amplitude of the first AC voltage signal required in the first viewing angle mode; determining a first grayscale value according to the first grayscale voltage and the corresponding relationship between different grayscale values and grayscale voltages in the touch display driving module; generating the first pure grayscale image data according to the first grayscale value.

[0012] Specifically, the step of providing second pure grayscale image data to the touch display driving module when it is necessary to switch the touch anti-peeping screen to the second viewing angle mode includes: determining a second grayscale voltage according to the voltage amplitude of the second AC voltage signal required in the second viewing angle mode; determining a second grayscale value according to the second grayscale voltage and the corresponding relationship between different grayscale values and grayscale voltages in the touch display driving module; generating the second pure grayscale image data according to the second grayscale value.

[0013] Specifically, the step of providing the first pure grayscale image data to the touch display driving module when the touch privacy screen needs to be switched to the first viewing angle mode further includes: determining a first frequency value according to the frequency of the first AC voltage signal required in the first viewing angle mode; generating the first pure grayscale image data with a first resolution according to the first frequency value, and / or providing a first control command for setting the frame inversion method to the touch display driving module.

[0014] Specifically, the step of providing the second pure grayscale image data to the touch display driving module when the touch privacy screen needs to be switched to the second viewing angle mode includes: determining a second frequency value according to the frequency of the second AC voltage signal required in the second viewing angle mode; generating the second pure grayscale image data with a second resolution according to the second frequency value, and / or providing a second control command for setting the frame inversion method to the touch display driving module.

[0015] For the touch privacy screen and control method provided by the present invention, since the touch sensing layer in the dimming liquid crystal cell is set as electrode blocks arranged in an array, and the touch display driving module provides voltage for the electrode blocks through corresponding touch traces, the functions of switching between wide and narrow viewing angle modes and touch function can be realized simultaneously; at the same time, there is no need to separately manufacture the touch sensing layer, which correspondingly reduces the manufacturing process and cost.

[0016] To make the above and other objects, features, and advantages of the present invention more obvious and understandable, the following specific preferred embodiments are given in conjunction with the accompanying drawings and are described in detail as follows. Description of the Drawings

[0017] Figure 1 is a partial structural schematic diagram of an existing touch privacy screen.

[0018] Figure 2 is a structural schematic diagram of the touch privacy screen according to the first embodiment of the present invention.

[0019] Figure 3 is a circuit connection schematic diagram of the touch privacy screen according to the first embodiment of the present invention.

[0020] Figure 4 is a signal timing diagram of the touch privacy screen according to an embodiment of the present invention.

[0021] Figure 5 is another circuit connection schematic diagram of the touch privacy screen according to the second embodiment of the present invention.

[0022] Figure 6 is a flowchart of the control method of the touch privacy screen according to the third embodiment of the present invention. Detailed Embodiments

[0023] To further elaborate on the technical means and effects adopted by the present invention to achieve the intended purpose, the following, in conjunction with the accompanying drawings and preferred embodiments, details the specific implementation manners, methods, steps, structures, features, and effects of the touch anti-peeping screen and control method proposed according to the present invention as follows.

[0024] The foregoing and other technical contents, features, and effects of the present invention will be clearly presented in the following detailed description of the preferred embodiments in conjunction with the reference drawings. Through the description of the specific implementation manners, a more in-depth and specific understanding of the technical means and effects adopted by the present invention to achieve the intended purpose can be obtained. However, the accompanying drawings are only for reference and illustration, and are not used to limit the present invention.

[0025] [First Embodiment]

[0026] Figure 2 is a schematic structural diagram of the touch anti-peeping screen according to the first embodiment of the present invention. Please refer to Figure 2 , in this embodiment, the touch anti-peeping screen of this embodiment includes a display liquid crystal cell, a dimming liquid crystal cell, and a touch display driving module 60. The display liquid crystal cell includes an array substrate, a color filter substrate disposed opposite to the array substrate, and a first liquid crystal layer located between the array substrate and the color filter substrate. Pixel electrodes and common electrodes are further provided on the array substrate. The display liquid crystal cell enables the first liquid crystal layer to rotate through the mutual cooperation of the pixel electrodes and the common electrodes on the array substrate for image display.

[0027] In this embodiment, the dimming liquid crystal cell is, for example, located on the light-emitting side of the display liquid crystal cell. In other embodiments, the dimming liquid crystal cell is, for example, located on the light-incident side of the display liquid crystal cell, which is not limited herein.

[0028] In this embodiment, the dimming liquid crystal cell includes a first substrate 10, a second substrate 50 disposed opposite to the first substrate 10, and a second liquid crystal layer 30 located between the first substrate 10 and the second substrate 50. A touch sensing layer 20 is provided on the side of the first substrate 10 facing the second liquid crystal layer 30. The touch sensing layer 20 is provided with a plurality of electrode blocks 21 arranged in an array, and the plurality of electrode blocks 21 are used to control the switching between narrow and wide viewing angle modes and touch sensing; a common electrode 40 is provided on the side of the second substrate 50 facing the second liquid crystal layer 30, and a DC common voltage is applied to the common electrode 40. For example, the DC common voltage applied to the common electrode 40 is 0V or a DC voltage with a small amplitude relative to 0V.

[0029] Figure 3 is a schematic circuit connection diagram of the touch anti-peeping screen according to the first embodiment of the present invention. Please refer to Figure 3, in this embodiment, the touch display driving module 60 includes a plurality of source channels S1 to Sm and a plurality of touch channels Sx1 to Sxm paired with the plurality of source channels S1 to Sm. The plurality of source channels S1 to Sm and the plurality of touch channels Sx1 to Sxm of the touch display driving module 60 are respectively connected to a plurality of electrode blocks 21 through touch traces 22. Among them, the plurality of source channels S1 to Sm of the touch display driving module 60 output an AC voltage signal for switching between narrow and wide viewing angle modes during non-touch time periods, and are in the Hi-Z state and output corresponding voltages during touch time periods. The plurality of touch channels Sx1 to Sxm of the touch display driving module 60 are in the Hi-Z state and output corresponding voltages during non-touch time periods, and output touch detection voltage signals during touch time periods.

[0030] In an embodiment of the present invention, an insulating layer is provided between the touch sensing layer 20 and the touch traces 22. The plurality of electrode blocks 21 are electrically connected to the corresponding touch traces 22 through a plurality of contact holes provided on the insulating layer, that is, multiple touch traces 22 are respectively electrically connected to each electrode block 21 to respectively control each electrode block 21. However, the setting method is not limited to this. Specifically, the number of contact holes above each electrode block 21 is, for example, 2. In other embodiments, only 1 or multiple may also be provided. This is not limited here.

[0031] The touch anti-peeping screen disclosed in this embodiment arranges the touch sensing layer in the dimming liquid crystal cell as electrode blocks arranged in an array, and the touch display driving module provides voltage for the electrode blocks through corresponding touch traces. The narrow and wide viewing angle mode switching function and the touch function are realized through the mutual cooperation between the touch sensing layer 20 on the first substrate 10 and the common electrode 40 on the second substrate 50. Thus, the touch anti-peeping screen in this embodiment does not require secondary lamination in the TP method during the manufacturing process, and does not require coating a touch sensing layer on the liquid crystal cell for realizing narrow and wide viewing angle module switching in the OnCell method, correspondingly reducing the manufacturing process and cost.

[0032] In an embodiment of the present invention, the plurality of source channels S1 to Sm and the plurality of touch channels Sx1 to Sxm of the touch display driving module 60 are arranged at intervals in the same direction. As Figure 3 shown, it can be arranged in an alternating pattern with the first source channel S1, the first touch channel Sx1, the second source channel S2, the second touch channel Sx2,... the mth source channel Sm, and the mth touch channel Sxm.

[0033] In an embodiment of the present invention, the plurality of source channels S1 to Sm and the plurality of touch channels Sx1 to Sxm of the touch display driving module 60 are sequentially paired and connected in pairs of two. The paired source channels and touch channels are connected to the corresponding electrode blocks 21 through a single touch trace 22. As Figure 3As shown, the first source channel S1 can be set to be connected to the first touch channel Sx1, the second source channel S2 to the second touch channel Sx2, …, and the m-th source channel Sm to the m-th touch channel Sxm, so as to achieve sequential pairwise connection of every two. As Figure 3 shown, the output ends of multiple source channels S1 to Sm are, for example, point A, and the output ends of multiple touch channels Sx1 to Sxm are, for example, point B. That is, both point A and point B are output Pins inside the touch display driving module 60. The connection points of multiple source channels S1 to Sm and multiple touch channels Sx1 to Sxm are, for example, point C. Point C is connected to the corresponding touch trace 22. That is, point C is the signal output to the in-plane of the dimming liquid crystal cell.

[0034] Specifically, in this embodiment, the time-sharing control output mode of the touch display driving module 60 is adopted to provide corresponding voltages for multiple electrode blocks 21, and the states of each channel are correspondingly changed in different modes to be simultaneously used for controlling the wide and narrow viewing angle mode switching and touch sensing. Among them, the gray-scale voltages output by the source channels S1 to Sm of the touch display driving module 60 are set as the AC voltage signals required for the wide and narrow viewing angle mode switching. Thus, the existing touch display driving module 60 can be used to meet the requirements, without the need to design and develop a new circuit with the functions of controlling the wide and narrow viewing angle mode switching and touch sensing.

[0035] Figure 4 is the signal timing diagram of the touch anti-peeping screen according to an embodiment of the present invention. Please also refer to Figure 3 and Figure 4 , Figure 4 In , the touch display driving module 60 is driven in the inter-frame touch driving (Long V, Long Vertical) mode, that is, frame output is performed according to the first synchronization signal Sync1, and the non-touch time period and the touch time period are divided according to the second synchronization signal Sync2. The voltage values output at point A, point B, and point C are all relative voltage values with respect to the DC common voltage (i.e., DC VCOM) applied to the common electrode 40, and the case where the second liquid crystal layer 30 uses negative liquid crystal molecules is taken as an example for illustration.

[0036] In the non-touch time period in the wide viewing angle mode (such as the first frame and the second frame in Figure 4 ), multiple source channels S1 to Sm of the touch display driving module 60 output AC voltage signals for wide and narrow viewing angle mode switching. As shown at point A in Figure 4 , the AC voltage signal can be a rectangular square wave with an amplitude of ±5V, and the frequency can be 60Hz to 120Hz. And multiple touch channels Sx1 to Sxm of the touch display driving module 60 are in the Hi-Z state and output corresponding voltages. As shown in Figure 4As shown at point B, the touch channels Sx1 to Sxm present a high impedance and can output a voltage that is the voltage before the moment of entering the Hi-Z state, such as 0V. The touch trace 22 is connected to the paired source channels S1 to Sm and the touch channels Sx1 to Sxm, and waveform superposition can be performed through capacitive coupling, as Figure 4 As shown at point C, the superimposed voltage can be a rectangular square wave with an amplitude of ±5V, and the frequency can be 60Hz to 120Hz. The touch trace 22 transmits the superimposed rectangular square wave to the corresponding electrode block 21. The voltage difference between the electrode block 21 and the common electrode 40 can correspondingly control the negative liquid crystal molecules in the second liquid crystal layer 30 to form a larger included angle with the first substrate 10 and the second substrate 50. At this time, the touch privacy screen is in the wide viewing angle mode. Among them, the touch channels Sx1 to Sxm must be in the Hi-Z state. If the touch channels Sx1 to Sxm are not in the Hi-Z state, affected by the 0V potential at point B, the output potential at point C is 0V or an AC square wave signal < ±5V, which will affect the wide viewing angle display effect.

[0037] During the touch time period in the wide viewing angle mode (such as Figure 4 the first frame and the second frame in), multiple source channels S1 to Sm of the touch display driving module 60 are in the Hi-Z state and output corresponding voltages, as Figure 4 As shown at point A, the source channels S1 to Sm present a high impedance and can output a voltage that is the voltage before the moment of entering the Hi-Z state, such as 5V, while multiple touch channels Sx1 to Sxm of the touch display driving module 60 output touch detection voltage signals for touch detection, as Figure 4 As shown at point B, the output voltage of the touch channels Sx1 to Sxm can be a rectangular square wave with an amplitude of ±1.8V, and the frequency can be 80kHz to 250kHz. The touch trace 22 is connected to the paired source channels S1 to Sm and the touch channels Sx1 to Sxm, and waveform superposition can be performed through capacitive coupling, as Figure 4As shown at point C, the superimposed voltage can be a rectangular square wave with a maximum voltage value of 5 + 1.8V and a minimum voltage value of 5 - 1.8V, and the frequency can be 80kHz to 250kHz. The touch trace 22 transmits this superimposed rectangular square wave to the corresponding electrode block 21. The voltage difference between the electrode block 21 and the common electrode 40 can correspondingly control the negative liquid crystal molecules in the second liquid crystal layer 30 to form a larger included angle with the first substrate 10 and the second substrate 50. At this time, the touch privacy screen is in the wide viewing angle mode. At the same time, when the user touches the dimming liquid crystal cell, a capacitance will be formed between the finger and the electrode block 21 corresponding to the touch position, and the electric quantity on the electrode block 21 will change. The touch display driving module 60 can sense the change in the electric quantity on the electrode block 21 corresponding to the user's touch position to detect the position where the user touches on the dimming liquid crystal cell, thereby realizing the touch function. Among them, the source channels S1 to Sm must be in the Hi-Z state. If the source channels S1 to Sm are not in the Hi-Z state, affected by the 5V potential at point A, the rectangular square wave of ±1.8V output at point B is blocked by the 5V potential at point A, and the 5V potential is output at point C, which will affect the touch effect.

[0038] In the non-touch time period in the narrow viewing angle mode (such as Figure 4 the third and fourth frames in Figure 4 ), the multiple source channels S1 to Sm of the touch display driving module 60 output an AC voltage signal for switching between the wide and narrow viewing angle modes. As shown at point A in Figure 4 , this AC voltage signal can be a rectangular square wave with an amplitude of ±2.5V, and the frequency can be 60Hz to 120Hz. And the multiple touch channels Sx1 to Sxm of the touch display driving module 60 are in the Hi-Z state and output corresponding voltages. As shown at point B in Figure 4 , the touch channels Sx1 to Sxm present a high impedance and can output a voltage that is the voltage before entering the Hi-Z state, such as 0V. The touch trace 22 is connected to the paired source channels S1 to Sm and touch channels Sx1 to Sxm, and the waveforms can be superimposed through capacitive coupling. As shown at point C in Figure 4 , the superimposed voltage can be a rectangular square wave with an amplitude of ±2.5V, and the frequency can be 60Hz to 120Hz. The touch trace 22 transmits this superimposed voltage to the corresponding electrode block 21. The voltage difference between the electrode block 21 and the common electrode 40 can correspondingly control the negative liquid crystal molecules in the second liquid crystal layer 30 to form a smaller included angle with the first substrate 10 and the second substrate 50. At this time, the touch privacy screen is in the narrow viewing angle mode. Among them, the touch channels Sx1 to Sxm must be in the Hi-Z state. If the touch channels Sx1 to Sxm are not in the Hi-Z state, affected by the 0V potential at point B, the 0V potential is output at point C or an AC square wave signal with < ±2.5V, which will affect the narrow viewing angle display effect.

[0039] In the narrow viewing angle mode (such as Figure 4During the touch time period (i.e., the third and fourth frames in [reference]), multiple source channels S1 to Sm of the touch display driving module 60 are in the Hi-Z state and output corresponding voltages. As shown at point A in Figure 4 the source channels S1 to Sm present a high impedance and can output a voltage that is the voltage before entering the Hi-Z state, for example, 2.5V. Multiple touch channels Sx1 to Sxm of the touch display driving module 60 output touch detection voltage signals for touch detection. As shown at point B in Figure 4 the output voltage of the touch channels Sx1 to Sxm can be a rectangular square wave with an amplitude of ±1.8V and a frequency of 80kHz to 250kHz. The touch trace 22 is connected to the paired source channels S1 to Sm and touch channels Sx1 to Sxm, and the waveforms can be superimposed through capacitive coupling. As shown at point C in Figure 4 the superimposed voltage can be a rectangular square wave with a maximum voltage value of 2.5 + 1.8V and a minimum voltage value of 2.5 - 1.8V, and a frequency of 80kHz to 250kHz. The touch trace 22 transmits the superimposed voltage to the corresponding electrode block 21. The voltage difference between the electrode block 21 and the common electrode 40 can correspondingly control the negative liquid crystal molecules in the second liquid crystal layer 30 to form a smaller angle with the first substrate 10 and the second substrate 50. At this time, the touch privacy screen is in the narrow viewing angle mode. At the same time, when the user touches the dimming liquid crystal cell, a capacitance is formed between the finger and the electrode block 21 corresponding to the touch position, and the charge on the electrode block 21 will change. The touch display driving module 60 can sense the change in the charge on the electrode block 21 corresponding to the user's touch position to detect the position where the user touches on the dimming liquid crystal cell, thereby realizing the touch function. Among them, the source channels S1 to Sm must be in the Hi-Z state. If the source channels S1 to Sm are not in the Hi-Z state, affected by the 2.5V potential at point A, the ±1.8V rectangular square wave output at point B is blocked by the 2.5V potential at point A, and the 2.5V potential is output at point C, which will affect the touch effect.

[0040] Therefore, for the touch privacy screen of this embodiment, since the touch sensing layer in the dimming liquid crystal cell is set as electrode blocks arranged in an array, and the touch display driving module provides voltages for the electrode blocks through corresponding touch traces, the functions of switching between wide and narrow viewing angle modes and touch function can be realized simultaneously; at the same time, there is no need to separately manufacture the touch sensing layer, which correspondingly reduces the manufacturing process and cost.

[0041] In an embodiment of the present invention, the touch display driving module 60 is a TDDI chip.

[0042] In an embodiment of the present invention, when the potential difference between the AC voltage signal for switching between wide and narrow viewing modes and the DC common voltage is less than a first preset value, the touch privacy screen is in the first viewing mode; when the potential difference between the AC voltage signal for switching between wide and narrow viewing modes and the DC common voltage is greater than a second preset value, the touch privacy screen is in the second viewing mode.

[0043] In an embodiment of the present invention, the second liquid crystal layer 30 uses positive liquid crystal molecules, the first viewing mode is a wide viewing mode, and the second viewing mode is a narrow viewing mode.

[0044] In an embodiment of the present invention, the second liquid crystal layer 30 uses negative liquid crystal molecules, the first viewing mode is a narrow viewing mode, and the second viewing mode is a wide viewing mode.

[0045] In this embodiment, different voltages can be respectively provided to each electrode block 21, that is, the voltages provided to each electrode block 21 by the touch display driving module 60 during time-sharing control output may not be exactly the same. Therefore, there may be different potential differences between each electrode block 21 and the common electrode 40. That is, according to this embodiment, each electrode block 21 in at least one area can receive the voltage provided by the touch display driving module 60 in the narrow viewing mode, and each electrode block 21 in other areas can receive the voltage provided by the touch display driving module 60 in the wide viewing mode. That is to say, when the touch privacy screen of this embodiment displays a picture, anti-peeping can be performed on some picture areas. Among them, the size of each electrode block 21 in this embodiment can be a square area with a side length of 4 - 8 mm, so the touch privacy screen of this embodiment can perform anti-peeping on any picture area.

[0046] [Second Embodiment]

[0047] Figure 5 is another circuit connection schematic diagram of the touch privacy screen according to the second embodiment of the present invention. Please refer to Figure 5 , this embodiment provides a touch privacy screen, whose basic structure, principle, and the resulting technical effects are the same as those of the first embodiment. For a brief description, for the parts not mentioned in this embodiment, reference can be made to the corresponding content in the first embodiment.

[0048] In the touch privacy screen of this embodiment, it is possible but not limited to connect the odd-numbered source channels S1, S3,... S2n+1 and the odd-numbered touch channels Sx1, Sx3,... Sx2n+1 of the touch display driving module 60 in pairs, and connect them to a plurality of electrode blocks 21 respectively through corresponding touch traces 22.

[0049] Specifically, limited by the size of the electrode block 21 and the arrangement of the touch traces 22, the number of touch channels Sx1 to Sx2n+1 of the actually used touch display driving module 60 is small. Therefore, when there are too many touch channels Sx1 to Sx2n+1 on the touch display driving module 60, only some of the touch channels can be selectively used, and correspondingly only some of the source channels of the touch display driving module 60 are used. It is possible but not limited to connect the odd-numbered source channels S1, S3,... S2n+1 and the odd-numbered touch channels Sx1, Sx3,... Sx2n+1 of the touch display driving module 60 in pairs, and connect them to the plurality of electrode blocks 21 through the touch traces 22 respectively. Correspondingly, the even-numbered source channels S2, S4,... S2n and the even-numbered touch channels Sx2, Sx4,... Sx2n of the touch display driving module 60 can be placed unused or used in other ways. Those skilled in the art can deform this embodiment according to needs to obtain a new embodiment, such as the deformation of swapping the odd and even positions, and the technical solutions of the embodiments all fall within the protection scope of the present application.

[0050] [Third Embodiment]

[0051] Based on the same inventive concept, an embodiment of the present invention further provides a control method for a touch anti-peeping screen, which is used for the touch anti-peeping screen provided in the above embodiment.

[0052] Figure 6 is a flowchart of the control method for the touch anti-peeping screen according to the third embodiment of the present invention. Please refer to Figure 6 , the control method for the touch anti-peeping screen in this embodiment includes:

[0053] S1. Apply a DC common voltage to the common electrode 40.

[0054] S2. When it is necessary to switch the touch anti-peeping screen to the first viewing angle mode, provide the first pure grayscale image data to the touch display driving module 60; a plurality of source channels of the touch display driving module 60 output a first AC voltage signal to the plurality of electrode blocks 21 during non-touch time periods, and are in the Hi-Z state and output corresponding voltages during touch time periods, wherein the first AC voltage signal is a frame-inverted grayscale voltage signal generated according to the first pure grayscale image data; a plurality of touch channels of the touch display driving module 60 are in the Hi-Z state and output corresponding voltages during non-touch time periods, and output a touch detection voltage signal to the plurality of electrode blocks 21 during touch time periods.

[0055] S3. When it is necessary to switch the touch privacy screen to the second perspective mode, provide the second pure grayscale image data to the touch display driving module 60; multiple source channels of the touch display driving module 60 output a second AC voltage signal to multiple electrode blocks 21 during non-touch time periods, and are in the Hi-Z state and output corresponding voltages during touch time periods, wherein the second AC voltage signal is a frame-inverted grayscale voltage signal generated according to the second pure grayscale image data; multiple touch channels of the touch display driving module 60 are in the Hi-Z state and output corresponding voltages during non-touch time periods, and output a touch detection voltage signal to multiple electrode blocks 21 during touch time periods.

[0056] In this embodiment, the touch display driving module 60 can generate corresponding frame-inverted first grayscale voltage signal and second grayscale voltage signal according to the first pure grayscale image data and the second pure grayscale image data, so as to be used as the AC voltage signal output by the source channels during non-touch time periods for wide and narrow viewing angle mode switching. In addition, for the specific implementation manner of the touch display driving module 60 in this embodiment to perform time-sharing control output and provide voltages to the electrode blocks 21 to achieve wide and narrow viewing angle mode switching and touch functions, reference can be made to the corresponding content in the first embodiment, which will not be elaborated here.

[0057] In an embodiment of the present invention, the steps of providing the first pure grayscale image data to the touch display driving module 60 when it is necessary to switch the touch privacy screen to the first perspective mode include: determining the first grayscale voltage according to the voltage amplitude of the first AC voltage signal required in the first perspective mode; determining the first grayscale value according to the first grayscale voltage and the corresponding relationship between different grayscale values and grayscale voltages in the touch display driving module 60; generating the first pure grayscale image data according to the first grayscale value. In an embodiment, the corresponding relationship between different grayscale values and grayscale voltages in the touch display driving module 60 can be obtained by querying a data correspondence table stored in the touch display driving module 60 for setting the corresponding relationship between different grayscale values and grayscale voltages, etc.

[0058] In an embodiment of the present invention, the steps of providing the second pure grayscale image data to the touch display driving module 60 when it is necessary to switch the touch privacy screen to the second perspective mode include: determining the second grayscale voltage according to the voltage amplitude of the second AC voltage signal required in the second perspective mode; determining the second grayscale value according to the second grayscale voltage and the corresponding relationship between different grayscale values and grayscale voltages in the touch display driving module 60; generating the second pure grayscale image data according to the second grayscale value. In an embodiment, the corresponding relationship between different grayscale values and grayscale voltages in the touch display driving module 60 can be obtained by querying a data correspondence table stored in the touch display driving module 60 for setting the corresponding relationship between different grayscale values and grayscale voltages, etc.

[0059] Specifically, the touch display driving module 60 can adjust the gamma voltage according to the received first pure grayscale image data to generate a first grayscale voltage; and can adjust the gamma voltage according to the received second pure grayscale image data to generate a second grayscale voltage. For example, the 127 pure grayscale image data can be used to generate a grayscale voltage of ±2.5V, which is used as an AC voltage signal for switching between narrow and wide viewing angle modes output by the source channel during the non-touch time period.

[0060] In an embodiment of the present invention, when it is necessary to switch the touch privacy screen to the first viewing angle mode, the step of providing the first pure grayscale image data to the touch display driving module 60 further includes: determining a first frequency value according to the frequency of the first AC voltage signal required in the first viewing angle mode; generating the first pure grayscale image data with a first resolution according to the first frequency value, and / or providing a first control command for setting the frame inversion method to the touch display driving module 60. In this embodiment, the touch display driving module 60 can set an adjustable first frequency value, such as 60-150Hz, according to the first pure grayscale image data with a first resolution and / or according to the received first control command for setting the frame inversion method, and is used to generate a first grayscale voltage with frame inversion at the first frequency value, so as to output an AC voltage signal with the first frequency value for switching between narrow and wide viewing angle modes by the source channel during the non-touch time period.

[0061] In an embodiment of the present invention, when it is necessary to switch the touch privacy screen to the second viewing angle mode, the step of providing the second pure grayscale image data to the touch display driving module 60 includes: determining a second frequency value according to the frequency of the second AC voltage signal required in the second viewing angle mode; generating the second pure grayscale image data with a second resolution according to the second frequency value, and / or providing a second control command for setting the frame inversion method to the touch display driving module 60. In this embodiment, the touch display driving module 60 can set an adjustable second frequency value, such as 60-150Hz, according to the second pure grayscale image data with a second resolution and / or according to the received second control command for setting the frame inversion method, and is used to generate a second grayscale voltage with frame inversion at the second frequency value, so as to output an AC voltage signal with the second frequency value for switching between narrow and wide viewing angle modes by the source channel during the non-touch time period. The first frequency value and the second frequency value may be equal or not equal.

[0062] The touch privacy screen and control method of the present invention can provide voltage for the electrode block 21 through the touch display driving module 60, realize the switching between narrow and wide viewing angle modes and the touch function, and correspondingly reduce the manufacturing process and cost.

[0063] The above are only the preferred embodiments of the present invention and do not impose any form of limitation on the present invention. Although the present invention has been disclosed above with the preferred embodiments, it is not intended to limit the invention. Any person skilled in the art can make some changes or modifications to equivalent embodiments with equivalent changes within the scope of the technical solution of the invention by using the technical content disclosed above. However, as long as it does not depart from the content of the technical solution of the invention, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the invention still fall within the scope of the technical solution of the present invention.

Claims

1. A touch anti-peeping screen, characterized in that, It includes a display liquid crystal cell, the display liquid crystal cell includes an array substrate, a color filter substrate disposed opposite to the array substrate, and a first liquid crystal layer located between the array substrate and the color filter substrate; it further includes: A dimming liquid crystal cell, the dimming liquid crystal cell includes a first substrate (10), a second substrate (50) disposed opposite to the first substrate (10), and a second liquid crystal layer (30) located between the first substrate (10) and the second substrate (50). A touch sensing layer (20) is provided on one side of the first substrate (10) facing the second liquid crystal layer (30). The touch sensing layer (20) is provided with a plurality of electrode blocks (21) arranged in an array. The plurality of electrode blocks (21) are used to control the switching of narrow and wide viewing angle modes and touch sensing; a common electrode (40) is provided on one side of the second substrate (50) facing the second liquid crystal layer (30), and a DC common voltage is applied to the common electrode (40). A touch display driving module (60), the touch display driving module (60) includes a plurality of source channels and a plurality of touch channels paired with the plurality of source channels. The plurality of source channels and the plurality of touch channels of the touch display driving module (60) are respectively connected to the plurality of electrode blocks (21) through touch traces (22). Among them, the plurality of source channels of the touch display driving module (60) output an AC voltage signal for switching between narrow and wide viewing angle modes during non-touch time periods, and are in a Hi-Z state and output corresponding voltages during touch time periods. The plurality of touch channels of the touch display driving module (60) are in a Hi-Z state and output corresponding voltages during non-touch time periods, and output a touch detection voltage signal during touch time periods.

2. The touch anti-peeping screen according to claim 1, wherein, An insulating layer is provided between the touch sensing layer (20) and the touch traces (22). The plurality of electrode blocks (21) are electrically connected to the touch traces (22) through a plurality of via holes provided on the insulating layer.

3. The touch anti-peeping screen according to claim 1, characterized in that, The plurality of source channels and the plurality of touch channels of the touch display driving module (60) are arranged at intervals in the same direction.

4. The touch anti-peeping screen according to claim 3, wherein The plurality of source channels and the plurality of touch channels of the touch display driving module (60) are sequentially paired and connected in pairs of two, and are connected to the plurality of electrode blocks (21) through the touch traces (22).

5. The touch anti-peeping screen according to claim 3, characterized in that, The plurality of odd-numbered source channels and the plurality of odd-numbered touch channels of the touch display driving module (60) are paired and connected, and are respectively connected to the plurality of electrode blocks (21) through the touch traces (22).

6. A control method for a touch anti-peeping screen, used to control the touch anti-peeping screen according to any one of claims 1-5, characterized in that, It includes: Applying a DC common voltage to the common electrode (40); When it is necessary to switch the touch anti-peeping screen to the first viewing angle mode, first pure grayscale image data is provided to the touch display driving module (60); a plurality of source channels of the touch display driving module (60) output a first AC voltage signal to the plurality of electrode blocks (21) during a non-touch time period, and are in a Hi-Z state and output corresponding voltages during a touch time period, wherein the first AC voltage signal is a frame-inverted grayscale voltage signal generated according to the first pure grayscale image data; a plurality of touch channels of the touch display driving module (60) are in a Hi-Z state and output corresponding voltages during a non-touch time period, and output the touch detection voltage signal to the plurality of electrode blocks (21) during a touch time period; When it is necessary to switch the touch anti-peeping screen to the second viewing angle mode, second pure grayscale image data is provided to the touch display driving module (60); a plurality of source channels of the touch display driving module (60) output a second AC voltage signal to the plurality of electrode blocks (21) during a non-touch time period, and are in a Hi-Z state and output corresponding voltages during a touch time period, wherein the second AC voltage signal is a frame-inverted grayscale voltage signal generated according to the second pure grayscale image data; a plurality of touch channels of the touch display driving module (60) are in a Hi-Z state and output corresponding voltages during a non-touch time period, and output the touch detection voltage signal to the plurality of electrode blocks (21) during a touch time period.

7. The control method of the touch anti-peeping screen according to claim 6, wherein The step of providing first pure grayscale image data to the touch display driving module (60) when it is necessary to switch the touch anti-peeping screen to the first viewing angle mode includes: Determining a first grayscale voltage according to the voltage amplitude of the first AC voltage signal required in the first viewing angle mode; Determining a first grayscale value according to the first grayscale voltage and the corresponding relationship between different grayscale values and grayscale voltages in the touch display driving module (60); Generating the first pure grayscale image data according to the first grayscale value.

8. The control method of the touch anti-peeping screen according to claim 6, wherein, The step of providing second pure grayscale image data to the touch display driving module (60) when it is necessary to switch the touch anti-peeping screen to the second viewing angle mode includes: Determining a second grayscale voltage according to the voltage amplitude of the second AC voltage signal required in the second viewing angle mode; Determining a second grayscale value according to the second grayscale voltage and the corresponding relationship between different grayscale values and grayscale voltages in the touch display driving module (60); Generating the second pure grayscale image data according to the second grayscale value.

9. The control method of the touch anti-peeping screen according to claim 6, characterized in that, The step of providing first pure grayscale image data to the touch display driving module (60) when it is necessary to switch the touch anti-peeping screen to the first viewing angle mode further includes: Determining a first frequency value according to the frequency of the first AC voltage signal required in the first viewing angle mode; Generating the first pure grayscale image data with a first resolution according to the first frequency value, and / or providing a first control command for setting the frame inversion mode to the touch display driving module (60).

10. The control method of the touch anti-peeping screen according to claim 6, wherein The step of providing second pure grayscale image data to the touch display driving module (60) when the touch anti-peeping screen needs to be switched to the second viewing angle mode includes: Determining a second frequency value according to the frequency of the second AC voltage signal required in the second viewing angle mode; Generating the second pure grayscale image data with a second resolution according to the second frequency value, and / or providing a second control command for setting the frame inversion mode to the touch display driving module (60).

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