CN111123562B - Touch display panel with switchable wide and narrow viewing angles and liquid crystal display device - Google Patents
Touch display panel with switchable wide and narrow viewing angles and liquid crystal display device Download PDFInfo
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- CN111123562B CN111123562B CN201911352838.6A CN201911352838A CN111123562B CN 111123562 B CN111123562 B CN 111123562B CN 201911352838 A CN201911352838 A CN 201911352838A CN 111123562 B CN111123562 B CN 111123562B
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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
- G02F1/1323—Arrangements for providing a switchable viewing angle
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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
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1343—Electrodes
- G02F1/134309—Electrodes characterised by their geometrical arrangement
Abstract
A touch display panel with switchable wide and narrow viewing angles and a liquid crystal display device are provided, wherein a first liquid crystal layer in the touch display panel is clamped between a first substrate and a second substrate to form a first liquid crystal box, and a second liquid crystal layer is clamped between a third substrate and a fourth substrate to form a second liquid crystal box; a first control electrode is arranged on one side of the third substrate close to the second liquid crystal layer, a second control electrode and a touch electrode are arranged on one side of the fourth substrate close to the second liquid crystal layer, and the second control electrode and the touch electrode are insulated at intervals; the first control electrode and the second control electrode are used for applying a first visual angle control signal and a second visual angle control signal for switching a wide visual angle and a narrow visual angle respectively, and the touch electrode is used for realizing a touch function. The first liquid crystal box realizes picture display, and the second liquid crystal box realizes wide and narrow visual angle switching and touch control functions, so that an external touch control module is not needed, the overall thickness of the touch control display panel is reduced, and the cost is reduced.
Description
Technical Field
The invention relates to the technical field of display, in particular to a touch display panel with switchable wide and narrow viewing angles and a liquid crystal display device.
Background
With the development of the information era, the application of the display screen is increasingly wide and diversified, and the display screen with the touch function is increasingly popularized. In recent years, personal privacy protection is more and more important, and most of liquid crystal display devices (such as mobile phones and notebooks) adopt wide-viewing-angle display, which is inconvenient in public places. Based on the market trend, there is an increasing demand for a touch display panel with a privacy effect and switchable wide and narrow viewing angles.
Referring to fig. 1, an external touch module is required for implementing a touch function of a conventional touch display panel with switchable wide and narrow viewing angles, and the touch display panel includes a backlight module 10, a first liquid crystal cell 11 for implementing display, a second liquid crystal cell 12 for implementing switching of the wide and narrow viewing angles, and an external touch module 13, so that the problems of large finished product thickness, high cost and low yield are caused, and the external touch module 13 also affects the display quality.
Disclosure of Invention
The invention aims to provide a touch display panel with switchable wide and narrow viewing angles and a liquid crystal display device, and aims to solve the problems that a touch display panel with an anti-peeping function in the prior art is large in thickness and high in cost.
The invention provides a touch display panel with switchable wide and narrow viewing angles, which comprises a first substrate, a first liquid crystal layer, a second substrate, a third substrate, a second liquid crystal layer and a fourth substrate, wherein the first liquid crystal layer is clamped between the first substrate and the second substrate to form a first liquid crystal box, and the second liquid crystal layer is clamped between the third substrate and the fourth substrate to form a second liquid crystal box; a first control electrode is arranged on one side, close to the second liquid crystal layer, of the third substrate, a second control electrode and a touch electrode are arranged on one side, close to the second liquid crystal layer, of the fourth substrate, and the second control electrode and the touch electrode are insulated at intervals; the first control electrode and the second control electrode are used for applying a first visual angle control signal and a second visual angle control signal for switching a wide visual angle and a narrow visual angle respectively, and the touch electrode is used for realizing a touch function.
Further, the touch electrode comprises a plurality of first touch electrode strips and a plurality of second touch electrode strips; the plurality of first touch electrode strips extend along a first direction and are arranged at intervals along a second direction, the plurality of second touch electrode strips extend along the second direction and are arranged at intervals along the first direction, and the first direction and the second direction are mutually crossed; the second control electrode and the plurality of first touch electrode strips are made of the same material and are formed in the same etching process.
Further, the second control electrode includes a plurality of second control electrode strips, each of the second control electrode strips extends along the first direction, and the plurality of second control electrode strips and the plurality of first touch electrode strips are arranged at intervals in the second direction.
Furthermore, the second control electrode strips and the first touch electrode strips are both of a grid structure formed by intersecting conducting wires, and the second control electrode strips and the first touch electrode strips are insulated from each other.
Furthermore, each first touch electrode strip is a rectangle with a long edge extending along the first direction, the first touch electrode strips are sequentially arranged in the second direction with a first interval width as a period, and the width of the first touch electrode strips in the second direction is 0.5-0.75 times of the first interval width.
Further, the width of the first touch electrode strip in the second direction is 1-3 times that of the second control electrode strip in the second direction.
Further, the second control electrode is planar, and the second control electrode is closer to the second liquid crystal layer than the touch electrode.
Further, the second liquid crystal layer adopts positive liquid crystal, and the second viewing angle control signal is direct current control voltage; a voltage difference between the first view angle control signal and the second view angle control signal is less than a preset value in a wide view angle mode; and in the narrow visual angle mode, the first visual angle control signal is an alternating current control voltage, and the alternating current control voltage takes the direct current control voltage as a fluctuation center.
The invention further provides a liquid crystal display device which comprises a driving chip and any one of the touch display panels with switchable wide and narrow viewing angles, wherein the driving chip is electrically connected with the first control electrode, the second control electrode and the touch electrode.
Furthermore, the first substrate is closer to the second liquid crystal cell than the second substrate, a scanning line and a data line are arranged on one side of the first substrate close to the first liquid crystal layer, and the driving chip is electrically connected with the scanning line and the data line.
The invention provides a touch display panel with switchable wide and narrow visual angles and a liquid crystal display device, wherein a first liquid crystal box realizes picture display, and a second liquid crystal box realizes wide and narrow visual angle switching and touch functions, so that an external touch module is not needed, the whole thickness of the touch display panel is reduced, and the cost is reduced.
According to some embodiments of the invention, the second control electrode and the plurality of first touch electrode strips in the second liquid crystal cell are made of the same material and are formed in the same etching process, so that the etching step and the manufacturing cost are saved.
According to some embodiments of the present invention, the second control electrode is closer to the second liquid crystal layer than the touch electrode, and the planar second control electrode can prevent the touch signal from being interfered by the electric field in the second liquid crystal cell.
Drawings
Fig. 1 is a schematic structural diagram of a touch display panel with switchable wide and narrow viewing angles in the prior art.
Fig. 2 is a schematic structural diagram of a touch display panel with switchable wide and narrow viewing angles according to a first embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a second liquid crystal cell in the touch display panel shown in fig. 2.
Fig. 4 is a schematic structural diagram of a touch electrode in the second liquid crystal cell shown in fig. 3.
Fig. 5 is a schematic structural diagram of the first touch electrode stripes and the second control electrode stripes in the second liquid crystal cell shown in fig. 3.
Fig. 6(a) is a schematic waveform diagram of the touch signal, the first viewing angle control signal and the second viewing angle control signal in the wide viewing angle mode.
Fig. 6(b) is a schematic waveform diagram of the touch signal, the first viewing angle control signal and the second viewing angle control signal in the narrow viewing angle mode.
Fig. 7 is a schematic structural diagram of a liquid crystal display device according to a first embodiment of the invention.
Fig. 8 is a schematic structural diagram of a liquid crystal display device according to a second embodiment of the invention.
Fig. 9(a) is a schematic partial structure view of a touch electrode in a touch display panel with switchable wide and narrow viewing angles according to a third embodiment of the present invention.
Fig. 9(b) is a schematic structural diagram of the first touch electrode strips and the second control electrode strips in the touch display panel with switchable wide and narrow viewing angles according to the third embodiment of the present invention.
Fig. 10(a) is a schematic waveform diagram of a touch signal, a first viewing angle control signal and a second viewing angle control signal of a touch display panel with switchable wide and narrow viewing angles according to a fourth embodiment of the present invention in a narrow viewing angle mode.
Fig. 10(b) is a schematic waveform diagram of another touch signal, a first viewing angle control signal and a second viewing angle control signal of the touch display panel with switchable wide and narrow viewing angles in the narrow viewing angle mode according to the fourth embodiment of the present invention.
Fig. 11 is a schematic structural diagram of a second liquid crystal cell in a touch display panel with switchable wide and narrow viewing angles according to a fifth embodiment of the disclosure.
Detailed Description
The following detailed description of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
First embodiment
Referring to fig. 2 and fig. 3, fig. 2 shows a schematic structural diagram of a touch display panel with switchable wide and narrow viewing angles according to a first embodiment of the present invention, and fig. 3 shows a schematic structural diagram of a second liquid crystal cell 400 in the touch display panel. The touch display panel includes: a first substrate 20, a first liquid crystal layer 31, a second substrate 40, a third substrate 50, a second liquid crystal layer 32, and a fourth substrate 60. The first substrate 20 and the second substrate 40 are disposed opposite to each other, the first liquid crystal layer 31 is sandwiched between the first substrate 20 and the second substrate 40 to form a first liquid crystal cell 300, and the first liquid crystal cell 300 is used for implementing image display. The third substrate 50 and the fourth substrate 60 are disposed opposite to each other, the second liquid crystal layer 32 is sandwiched between the third substrate 50 and the fourth substrate 60 to form a second liquid crystal cell 400, and the second liquid crystal cell 400 is used for implementing both the wide and narrow viewing angle switching function and the touch control function. The touch display panel of the embodiment does not need to be externally hung with a touch module, so that the overall thickness of the touch display panel is reduced, and the cost is reduced.
In the present embodiment, the first liquid crystal cell 300 is described by taking an FFS (fringe field switching) display mode as an example, but the invention is not limited thereto. In this embodiment, the first substrate 20 is fabricated to form an array substrate, and the second substrate 40 is fabricated to form a color filter substrate. The first substrate 20 is provided with a common electrode 21, an insulating layer 22, a plurality of pixel electrodes 23 and a first alignment film 24 on a side close to the first liquid crystal layer 31, the common electrode 21 and the pixel electrodes 23 are located on different layers and sandwich the insulating layer 22 therebetween, a fringe electric field is generated between the pixel electrodes 23 and the first common electrode 21 to drive liquid crystal molecules in the first liquid crystal layer 31 to rotate, and the first substrate 20 is provided with a first polarizer 25 on a side far away from the first liquid crystal layer 31. Furthermore, the first substrate 20 is further provided with scanning lines and data lines which are crisscrossed on a side facing the first liquid crystal layer 31, the scanning lines and the data lines intersect to define a plurality of pixel units arranged in a matrix, each pixel electrode 23 is located in a corresponding pixel unit, a thin film transistor is further arranged in each pixel unit, a gate of the thin film transistor is connected with the corresponding scanning line, a source of the thin film transistor is connected with the corresponding data line, and a drain of the thin film transistor is connected with the corresponding pixel electrode 23. The second substrate 40 is provided with a color filter layer 41, a conductive shielding layer 42 and a second alignment film 43 on a side close to the first liquid crystal layer 31, the first alignment film 24 and the second alignment film 43 are respectively located on two sides of the first liquid crystal layer 31 and are used for assisting liquid crystal molecules to form a pretilt angle, the second substrate 40 is provided with a second polarizer 44 on a side far away from the first liquid crystal layer 31, and a transmission axis of the second polarizer 44 is perpendicular to a transmission axis of the first polarizer 25.
The second liquid crystal cell 400 of the present embodiment adopts a mutual capacitive touch mode. The third substrate 50 is provided with a first control electrode 51 and a third alignment film 52 on a side close to the second liquid crystal layer 32, and the third substrate 50 is provided with a third polarizer 53 on a side away from the second liquid crystal layer 32. The fourth substrate 60 is provided with a second control electrode 61, a touch electrode 62 and a fourth alignment film 63 on a side close to the second liquid crystal layer 32, the second control electrode 61 and the touch electrode 62 are insulated at intervals, the touch electrode 62 in the mutual capacitance type touch mode is a double-layer metal structure, the second control electrode 61 may be made of the same material as one layer of the double-layer metal structure and formed in the same etching process, and the second control electrode 61 may not be located in the same layer as any metal layer of the touch electrode 62. The third alignment film 52 and the fourth alignment film 63 are respectively located on two sides of the second liquid crystal layer 32 and are used for assisting the liquid crystal molecules to form a pretilt angle, the fourth substrate 60 is provided with a fourth polarizer 64 on one side away from the second liquid crystal layer 32, and a transmission axis of the fourth polarizer 64 is parallel to a transmission axis of the third polarizer 53. A support column 33 is further provided in the second liquid crystal cell, and the bottom of the support column 33 is formed on the third substrate 50 or the fourth substrate 60 for supporting the space inside the second liquid crystal cell 400 when the third substrate 50 and the fourth substrate 60 are opposed to each other into a cell.
The first control electrode 51 is formed by a transparent conductive material laid on the whole surface, and the first control electrode 51 is planar, hollow grid or formed by a plurality of wires arranged in parallel. Referring to fig. 4, fig. 4 shows a schematic structural diagram of the touch electrode 62, the touch electrode 62 includes a plurality of first touch electrode stripes 621 and a plurality of second touch electrode stripes 623, the plurality of first touch electrode stripes 621 extend along a first direction Y and are arranged at intervals along a second direction X, the plurality of second touch electrode stripes 623 extend along the second direction X and are arranged at intervals along the first direction Y, and the first direction Y and the second direction X are mutually crossed. The first touch electrode strips 621 and the second touch electrode strips 623 are both of a grid structure formed by intersecting conducting wires, and the first touch electrode strips 621 and the second touch electrode strips 623 are located at different layers and sandwich the first isolation layer 622 therebetween.
The first control electrode 51 and the second control electrode 61 respectively apply a first viewing angle control signal HVA1 and a second viewing angle control signal HVA2 for switching a wide viewing angle and a narrow viewing angle, and the touch electrode 62 is used for realizing a touch function, in the embodiment, the first touch electrode stripes 621 are used as touch sensing electrodes, and the second touch electrode stripes 623 are used as touch driving electrodes; in other embodiments, it is possible that the first touch electrode strip 621 serves as a touch driving electrode and the second touch electrode strip 623 serves as a touch sensing electrode. The touch driving electrodes are used for receiving touch driving signals, and the touch sensing electrodes are used for sensing touch positions and outputting touch sensing signals.
Referring to fig. 4, each of the first touch electrode strips 621 is a rectangle whose long side extends along the first direction Y, the first touch electrode strips 621 are sequentially arranged in the second direction X with the first interval width a as a period, and in order to avoid signal interference, the width a of the first touch electrode strips 621 in the second direction X is 0.5 to 0.75 times the first interval width a. Each of the second touch electrode strips 623 is a rectangle with a long side extending along the second direction X, the second touch electrode strips 623 are sequentially arranged in the first direction Y with the second interval width B as a period, and the width B of the second touch electrode strips 623 in the first direction Y is 0.75-0.99 times the second interval width B. Referring to fig. 5, the second control electrode 61 and the plurality of first touch electrode strips 621 are made of the same material and formed in the same etching process, the second control electrode 61 includes a plurality of second control electrode strips 611, each second control electrode strip 611 extends along the first direction Y, the plurality of second control electrode strips 611 and the plurality of first touch electrode strips 621 are arranged at intervals in the second direction X, and a width a of the first touch electrode strips 621 in the second direction X is 1 to 3 times of a width of the second control electrode strips 611 in the first direction Y. The second control electrode strips 611 are also of a grid structure formed by intersecting conducting wires, the second control electrode strips 611 fill the gap between two adjacent first touch electrode strips 621, and the second control electrode strips 611 and the first touch electrode strips 621 are insulated from each other.
The second control electrode strips 611 are formed by using a spacer (dummy area) between two adjacent first touch electrode strips 621, so that the etching step and the manufacturing cost are saved, the second liquid crystal cell 400 is also light and thin, and the second control electrode strips 611 can assist the first touch electrode strips 621 to improve the touch sensing precision of touch modes such as an active pen.
Further, the first touch electrode bars 621, the second touch electrode bars 623, and the second control electrodes 61 are preferably formed of a transparent conductive material including, but not limited to, Indium Tin Oxide (ITO), Indium Zinc Oxide (IZO), and the like. The mesh structure of the first touch electrode bar 621, the second touch electrode bar 623, and the second control electrode 61 includes, but is not limited to, a rectangular mesh, a rhombic mesh, a triangular mesh, and the like. In the embodiment, rhombic grids are adopted, each rhombic grid comprises a first diagonal line and a second diagonal line which are perpendicular to each other, and the length of the first diagonal line and/or the second diagonal line is 250-350 μm. The width a of the first touch electrode stripes 621 in the second direction X is, for example, 3-6 mm, and the width of the second control electrode stripes 611 in the first direction Y is, for example, 1-2 mm.
Referring to fig. 6(a) and 6(b), the touch driving signal and the touch sensing signal are collectively referred to as a touch signal TP, and fig. 6(a) and 6(b) respectively show waveform diagrams of the touch signal TP, the first view angle control signal HVA1 and the second view angle control signal HVA2 in the wide view angle mode and the narrow view angle mode. One Frame of picture time (One Frame) of the touch display panel comprises an effective time period and a blank time period, the scanning line controls the thin film transistors in each row of pixel units to be sequentially turned on in the effective time period, and the data line applies data voltage to the pixel electrodes. The first touch electrode bars 621 receive touch driving signals in the blank time period, and the second touch electrode bars 623 sense touch positions and output touch sensing signals in the blank time period; alternatively, the second touch electrode strips 623 receive the touch driving signal during the blank time period, and the first touch electrode strips 621 sense the touch position and output the touch sensing signal during the blank time period. Specifically, the frame time is, for example, 16.7ms, wherein the blank period is 3 to 5ms, for example, 3ms, and the rest are active periods. The touch driving signal is input to the first touch electrode strips 621 or the second touch electrode strips 623 in a row scanning or column scanning manner, and the scanning frequency of the touch driving signal is 80-200 KHZ.
In this embodiment, the second liquid crystal layer 32 uses a positive liquid crystal, but not limited thereto, and in other embodiments, the second liquid crystal layer 32 may also use a negative liquid crystal. In the initial state (i.e., without any voltage applied), the liquid crystal molecules in the second liquid crystal layer 32 are in a posture with their long axes parallel to the third substrate 50. in practical applications, the initial pretilt angle of the liquid crystal molecules is, for example, 0 to 10 °.
The second visual angle control signal HVA2 is DC control voltage V h Since the second control electrode 61 close to the first touch electrode bar 621 and the second touch electrode bar 623 applies the dc control voltage V h Therefore, the sensing of the touch position is not interfered, the touch sensing and the viewing angle control can be performed synchronously, the interference between the electric field in the second liquid crystal cell 400 and the touch signal TP is reduced, and the display quality is improved.
In the wide viewing angle mode, a voltage difference between the first viewing angle control signal HVA1 and the second viewing angle control signal HVA2 is smaller than a preset value, for example, 0-1V, preferably, the first viewing angle control signal HVA1 is a dc control voltage Vh consistent with the second viewing angle control signal HVA2, liquid crystal molecules in the second liquid crystal cell 400 still maintain a small tilt angle, and the anti-peeping function is not turned on in the touch display panel formed by the first liquid crystal cell 300 and the second liquid crystal cell 400, so that a display screen can be viewed under a wide viewing angle.
In the narrow viewing angle mode, the first viewing angle control signal HVA1 is an ac control voltage, and the ac control voltage is a dc control voltage V h The alternating control voltage is a fluctuation center, and can prevent liquid crystal molecules from polarizing. A large voltage difference exists between the first control electrode 51 and the second control electrode 61, so that liquid crystal molecules in the second liquid crystal cell 400 deflect, and for the second liquid crystal cell 400, the brightness at a large viewing angle is reduced, and further the contrast of the whole touch display panel at the large viewing angle is reduced, so that the peep-proof function is realized. The waveform of the ac control voltage includes, but is not limited to, a sine wave, a triangular wave, a square wave, etc., the amplitude of the ac control voltage is, for example, 3 to 6V, and the frequency of the ac control voltage is, for example, 60 to 144Hz, for example, 75 Hz.
Further, referring to fig. 2, in the present embodiment, the second substrate 40 is closer to the second liquid crystal cell 400 than the first substrate 20, and the third substrate 50 is closer to the first liquid crystal cell 300 than the fourth substrate 60. The first liquid crystal cell 300 and the second liquid crystal cell 400 are bonded by a transparent optical Adhesive 70 (OCA), and an optical compensation film (compensation film) for increasing the light transmittance between the first liquid crystal cell 300 and the second liquid crystal cell 400 is further disposed between the first liquid crystal cell 300 and the second liquid crystal cell 400.
With reference to fig. 4 and fig. 7, the present embodiment further provides a liquid crystal display device, which includes any one of the touch display panels with switchable wide and narrow viewing angles, a backlight module 200 and a driving chip 80, wherein the backlight module 200 is disposed on a side of the first liquid crystal cell 300 away from the second liquid crystal cell 400, the driving chip 80 is electrically connected to the first control electrode 51, the second control electrode 61 and the touch electrode 62, and the driving chip 80 is connected to the plurality of first touch electrode strips 621 through the first touch signal lines 81 and connected to the plurality of first touch electrodes 62 through the second touch signal lines 82. The driving chip 80 transmits a first viewing angle control signal HVA1 to the first control electrodes 51 and transmits a second viewing angle control signal HVA2 to the plurality of second control electrode bars 611.
Second embodiment
Referring to fig. 8, fig. 8 shows a schematic structural diagram of a liquid crystal display device according to a second embodiment of the present invention, wherein the touch display panel is different from the first embodiment in that an array substrate of a first liquid crystal cell 300 is closer to a second liquid crystal cell 400 than a color filter substrate, wherein the array substrate includes a first substrate 20, a common electrode 21, an insulating layer 22, a plurality of pixel electrodes 23, a first alignment film 24 and a first polarizer 25, and the color filter substrate includes a second substrate 40, a color filter layer 41, a conductive shielding layer 42, a second alignment film 43 and a second polarizer 44.
In the liquid crystal Display device of the present embodiment, the driving chip 80 is a Touch and Display integrated chip (Touch and Display Driver Integration). The driving chip 80 is electrically connected to the scan lines and the data lines in the first liquid crystal cell 300, so as to control the first liquid crystal cell 300 to display; the driving chip 80 is electrically connected to the first control electrode 51, the second control electrode 61, the plurality of first touch electrode strips 621 and the plurality of second touch electrode strips 623 in the second liquid crystal cell 400, so as to control the second liquid crystal cell 400 to realize wide and narrow viewing angle switching and touch control functions.
In this embodiment, the first substrate 20 is provided with scan lines, data lines, tfts, common electrodes 21 and pixel electrodes 23, and the first substrate 20 is closer to the second liquid crystal cell 400 than the second substrate 40, which is convenient for the electrical connection between the driving chip 80 and the two liquid crystal cells because the first substrate 20 as an array substrate is closer to the second liquid crystal cell 400. The same driving chip 80 is convenient to realize the functions of display, wide and narrow visual angle switching and touch control, and the production cost is saved.
Third embodiment
Referring to fig. 9(a) and 9(b), fig. 9(a) shows a partial structure diagram of the touch electrode 62 in the touch display panel with switchable wide and narrow viewing angles according to the third embodiment of the present invention, and fig. 9(b) shows a schematic structure diagram of the plurality of first touch electrode stripes 621 and the plurality of second control electrode stripes 611 in the touch display panel. The difference from the first embodiment is that each first touch electrode stripe 621 is a stripe formed by connecting a plurality of diamonds in the first direction Y, and each second touch electrode stripe 623 is a stripe formed by connecting a plurality of diamonds in the second direction X. Each first touch electrode strip 621 is overlapped with the second touch electrode strip 623 in an insulating manner at the joint of two adjacent diamonds, the overlapped part is located at the joint of two adjacent diamonds in the second touch electrode 62, and each overlapped part is respectively located in the range defined by a square with the side length of 1-2 mm.
The width of the widest part of each first touch electrode strip 621 in the second direction X is 0.5-0.75 times of the first interval width a, the second control electrode strip 611 fills the gap between two adjacent first touch electrode strips 621 and is also formed by connecting a plurality of diamonds in the first direction Y, and the second control electrode strip 611 and the first touch electrode strips 621 are insulated from each other. Meanwhile, the second control electrode bar 611, the first touch electrode bar 621 and the second touch electrode bar 623 are all of a grid structure formed by crossing conducting wires. Compared with a rectangular profile, the profile of the first touch electrode stripes 621 in this embodiment provides a wider dummy area, which increases the width of each second control electrode stripe 611, is beneficial to enhancing the electric field intensity for controlling the switching of the viewing angles in the second liquid crystal cell 400, and enhances the anti-peeping effect.
Fourth embodiment
Referring to fig. 10(a), a schematic diagram of waveforms of the touch signal TP, the first viewing angle control signal HVA1 and the second viewing angle control signal HVA2 of the switchable wide and narrow viewing angle touch display panel in the narrow viewing angle mode according to the fourth embodiment of the invention is shown, which is different from the first embodiment in that the first viewing angle control signal HVA1 applied to the first control electrode 51 has a sine waveform, a triangular waveform, and the like in the active period, and the dc control voltage V applied to the first viewing angle control signal HVA1 and the second control electrode 61 in the blank period h And (5) the consistency is achieved. The transmission of the touch driving signal and the touch sensing signal is in the blank period, so that the touch signal TP is prevented from being interfered by the electric field in the second liquid crystal cell 400. When performing touch sensing, the second control electrode bar 611 assists the first control electrode barThe touch electrode bars 621 improve the touch sensing precision of the active pen and other touch modes.
Further, since the first view angle control signal HVA1, the second view angle control signal HVA2 and the touch signal TP are staggered in time, the first view angle control signal HVA1 may be set to be constant as the dc control voltage Vh, and the second view angle control signal HVA2 may be the ac control voltage in the narrow view angle mode. Because the direct-current control voltage Vh is always applied to the first control electrode 51 close to the first liquid crystal box 300, the interference of the signal of the first control electrode 51 on the electric field in the first liquid crystal box 300 is reduced, the display quality is improved, and the planar first control electrode 51 can also be used as an electrostatic shielding layer of the first liquid crystal box 300, so that the anti-static capability of the touch display panel is improved.
Referring to fig. 10(b), since the display function of the first liquid crystal cell 300 and the wide-narrow viewing angle switching and touch control function of the second liquid crystal cell 400 are independent from each other, the transmission of the touch control driving signal and the touch control sensing signal can be within an effective time period, and the display of the first liquid crystal cell 300 is not affected.
Fifth embodiment
Fig. 11 is a schematic structural diagram of a second liquid crystal cell 400 in a touch display panel with switchable wide and narrow viewing angles according to a fifth embodiment of the invention, which is different from the first embodiment in that a second control electrode 61 is planar and is formed of a transparent conductive material. The second control electrodes 61 are closer to the second liquid crystal layer 32 than the touch electrodes 62, that is, the first touch electrode stripes 621 are closer to the second liquid crystal layer 32, the second control electrodes 61 are closer to the second liquid crystal layer 32 than the second touch electrode stripes 623, and the second isolation layer 624 is sandwiched between the second control electrodes 61 and the second touch electrode stripes 623. The planar second control electrode 61 not only can prevent the touch signal TP from being interfered by the electric field in the second liquid crystal cell 400, but also has an anti-static function.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (8)
1. A touch display panel with switchable wide and narrow viewing angles comprises a first substrate (20), a first liquid crystal layer (31), a second substrate (40), a third substrate (50), a second liquid crystal layer (32) and a fourth substrate (60), wherein the first liquid crystal layer (31) is sandwiched between the first substrate (20) and the second substrate (40) to form a first liquid crystal box (300), and the second liquid crystal layer (32) is sandwiched between the third substrate (50) and the fourth substrate (60) to form a second liquid crystal box (400); the liquid crystal display panel is characterized in that a first control electrode (51) is arranged on one side, close to the second liquid crystal layer (32), of the third substrate (50), a second control electrode (61) and a touch electrode (62) are arranged on one side, close to the second liquid crystal layer (32), of the fourth substrate (60), and the second control electrode (61) and the touch electrode (62) are insulated at intervals; the first control electrode (51) and the second control electrode (61) respectively apply a first viewing angle control signal (HVA1) and a second viewing angle control signal (HVA2) for switching wide and narrow viewing angles, and the touch electrode (62) is used for realizing a touch function;
the touch electrode (62) comprises a plurality of first touch electrode bars (621) and a plurality of second touch electrode bars (623); the plurality of first touch electrode strips (621) extend along a first direction (Y) and are arranged at intervals along a second direction (X), the plurality of second touch electrode strips (623) extend along the second direction (X) and are arranged at intervals along the first direction (Y), and the first direction (Y) and the second direction (X) are crossed with each other;
the second control electrode (61) and the plurality of first touch electrode strips (621) are made of the same material and are formed in the same etching process.
2. The switchable touch display panel with wide and narrow viewing angles according to claim 1, wherein the second control electrode (61) comprises a plurality of second control electrode bars (611), each of the second control electrode bars (611) extends along the first direction (Y), and the plurality of second control electrode bars (611) and the plurality of first touch electrode bars (621) are arranged at intervals in the second direction (X).
3. The switchable touch display panel with wide and narrow viewing angles of claim 2, wherein the second control electrode bar (611) and the first touch electrode bar (621) are both a grid structure formed by crossing conductive wires, and the second control electrode bar (611) and the first touch electrode bar (621) are insulated from each other.
4. The touch display panel with switchable wide and narrow viewing angles according to claim 2, wherein each of the first touch electrode strips (621) is a rectangle with a long side extending along the first direction (Y), a plurality of the first touch electrode strips (621) are sequentially arranged in the second direction (X) with a first interval width (a) as a period, and a width of the first touch electrode strip (621) in the second direction (X) is 0.5 to 0.75 times the first interval width (a).
5. The switchable touch display panel with wide and narrow viewing angles of claim 4, wherein the width of the first touch electrode bar (621) in the second direction (X) is 1-3 times the width of the second control electrode bar (611) in the second direction (X).
6. The switchable touch display panel with wide and narrow viewing angles of claim 1, wherein the second liquid crystal layer (32) is a positive liquid crystal, and the second viewing angle control signal (HVA2) is a dc control voltage (Vh);
a voltage difference between the first view angle control signal (HVA1) and the second view angle control signal (HVA2) is less than a preset value in a wide view angle mode;
the first viewing angle control signal (HVA1) is an ac control voltage centered around the dc control voltage (Vh) in the narrow viewing angle mode.
7. A liquid crystal display device, comprising a driving chip (80) and the touch display panel with switchable wide and narrow viewing angles as claimed in any one of claims 1 to 6, wherein the driving chip (80) is electrically connected to the first control electrode (51), the second control electrode (61) and the touch electrode (62).
8. The lcd device of claim 7, wherein the first substrate (20) is closer to the second lc cell (400) than the second substrate (40), the first substrate (20) is provided with a scan line and a data line at a side close to the first lc layer (31), and the driving chip (80) is electrically connected to the scan line and the data line.
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| CN111766975A (en) | 2020-06-12 | 2020-10-13 | 惠州市华星光电技术有限公司 | Touch panel and touch display device |
| CN112068342A (en) * | 2020-08-27 | 2020-12-11 | 惠州市华星光电技术有限公司 | Display screen and electronic equipment |
| CN111966249B (en) * | 2020-09-22 | 2024-03-15 | 京东方科技集团股份有限公司 | Touch display panel and electronic device |
| CN112764278B (en) * | 2021-01-05 | 2022-09-09 | 惠州市华星光电技术有限公司 | Liquid crystal display panel and liquid crystal display device |
| CN112925125A (en) * | 2021-03-25 | 2021-06-08 | 维沃移动通信有限公司 | Display device and electronic apparatus |
| CN114360465B (en) * | 2021-12-27 | 2023-05-26 | 厦门天马微电子有限公司 | Liquid crystal display device and driving method thereof |
| WO2023142092A1 (en) * | 2022-01-29 | 2023-08-03 | 京东方科技集团股份有限公司 | Liquid crystal handwriting pad and manufacturing method therefor |
| CN114740644A (en) * | 2022-04-19 | 2022-07-12 | 武汉华星光电技术有限公司 | Display panel and display terminal |
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