CN105807511B - Display panel, display device and driving method thereof - Google Patents
Display panel, display device and driving method thereof Download PDFInfo
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- CN105807511B CN105807511B CN201610227335.6A CN201610227335A CN105807511B CN 105807511 B CN105807511 B CN 105807511B CN 201610227335 A CN201610227335 A CN 201610227335A CN 105807511 B CN105807511 B CN 105807511B
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 239000000758 substrate Substances 0.000 claims abstract description 46
- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 36
- 230000000007 visual effect Effects 0.000 claims abstract description 17
- 230000005684 electric field Effects 0.000 abstract description 11
- 238000010586 diagram Methods 0.000 description 9
- 239000010408 film Substances 0.000 description 6
- 239000003990 capacitor Substances 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 244000144985 peep Species 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 102000009565 Lysosomal-Associated Membrane Protein 2 Human genes 0.000 description 1
- 108010009491 Lysosomal-Associated Membrane Protein 2 Proteins 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical compound [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
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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
-
- 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
-
- 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
-
- 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
- G02F1/134363—Electrodes characterised by their geometrical arrangement for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3614—Control of polarity reversal in general
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Crystallography & Structural Chemistry (AREA)
- Chemical & Material Sciences (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Mathematical Physics (AREA)
- Engineering & Computer Science (AREA)
- Geometry (AREA)
- Theoretical Computer Science (AREA)
- Computer Hardware Design (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Liquid Crystal Display Device Control (AREA)
Abstract
The invention discloses a display panel, a display device and a driving method thereof.A visual angle control electrode is arranged on a second substrate (a color filter substrate) of the display panel, and when a narrow visual angle is needed, voltage is applied to the visual angle control electrode so as to generate an electric field which is vertical to the direction of the display panel between the visual angle control electrode and a pixel electrode and a common electrode which are arranged on a first substrate (an array substrate), so that liquid crystal molecules generate inclination angle change in the vertical direction, and the purposes of oblique-view dark-state light leakage, contrast reduction, visual angle reduction and narrow-visual-angle display are achieved. Thus, by adjusting the voltage applied to the viewing angle control electrode, switching between the wide viewing angle and narrow viewing angle modes can be achieved.
Description
Technical Field
The invention belongs to the technical field of display, and particularly relates to a display panel, a display device and a driving method thereof.
Background
Liquid Crystal Displays (LCDs) have many advantages such as being light and thin, saving energy, and having no radiation, and thus have gradually replaced conventional Cathode Ray Tube (CRT) displays. Liquid crystal displays are widely used in high definition digital televisions, desktop computers, Personal Digital Assistants (PDAs), notebook computers, mobile phones, digital cameras, and other electronic devices.
At present, liquid crystal displays are gradually developed towards wide viewing angles, for example, wide viewing angle portable electronic display devices such as mobile phone terminals, desktop displays, and notebook computers, and the wide viewing angle design enables users to see complete and undistorted pictures from all directions. However, when the privacy and important information of the user are involved, the use of the wide-viewing-angle display may also cause inconvenience to the user in some situations, for example, when the user is at a bus station, etc., people beside and behind the user are likely to see the contents on the screen of the wide-viewing-angle portable electronic display device of the user.
Therefore, in addition to the demand for a wide viewing angle, displays capable of switching or adjusting the display to a narrow viewing angle mode have been developed in the case where peep prevention is required. Currently, there are three main ways to switch the wide viewing angle and the narrow viewing angle of the display: the first is realized by a shutter shielding film, when peep prevention is needed, the shutter shielding film is used for shielding a screen, and the visual angle can be reduced; the second is to arrange a dual light source backlight system in the liquid crystal display for adjusting the viewing angle of the liquid crystal display. The double-light source backlight system is formed by combining two layers of laminated light guide plates with a reverse prism sheet, wherein the top light guide plate (LGP-T) is combined with the reverse prism sheet to change the direction of light so that the light is limited in a narrower angle range to realize the narrow viewing angle of the liquid crystal display, and the bottom light guide plate (LGP-B) is combined with the reverse prism sheet to realize the wide viewing angle of the liquid crystal display; the third is that the driving electrodes on the panel of the liquid crystal display are divided into two types, one is the wide viewing angle display driving electrode, and the other is the viewing angle control electrode, when a proper voltage is applied to the viewing angle control electrode, the liquid crystal display can generate proper light leakage, and further, the switching between the wide viewing angle and the narrow viewing angle is realized.
However, the first method has the disadvantages that the method needs to prepare additional shutter films and needs to be carried about by a user, which causes great inconvenience to the user; the second method has the drawback that the dual light source backlight system increases the thickness and cost of the lcd, and does not meet the trend of making the lcd light and thin; the third method has a drawback in that two kinds of electrodes, i.e., a wide viewing angle display driving electrode and a viewing angle control electrode, are required to be disposed on the lcd, which reduces the aperture ratio of the lcd, resulting in a reduction in panel brightness of the lcd.
Therefore, there is a need to provide an improved technical solution to overcome the above technical problems in the prior art.
Disclosure of Invention
The invention aims to provide a display panel, a display device and a driving method thereof.
According to an aspect of the present invention, there is provided a display panel including: a first substrate provided with a plurality of pixel electrodes and a plurality of common electrodes in an array; a second substrate provided with a plurality of viewing angle control electrodes in an array; a liquid crystal layer disposed between the first substrate and the second substrate; the arrangement mode of the plurality of viewing angle control electrodes is consistent with the driving voltage inversion mode of the plurality of pixel electrodes; the odd-numbered viewing angle control electrodes and the even-numbered viewing angle control electrodes in the plurality of viewing angle control electrodes are respectively used for applying bias voltages with different polarities so as to adjust the viewing angle of the display panel.
Preferably, odd-numbered viewing angle control electrodes and even-numbered viewing angle control electrodes of the plurality of viewing angle control electrodes are staggered.
Preferably, odd-numbered viewing angle control electrodes of the plurality of viewing angle control electrodes have the same polarity of driving voltage as odd-numbered pixel electrodes of the plurality of pixel electrodes; the even-numbered viewing angle control electrode and the driving voltage of the even-numbered pixel electrode in the plurality of pixel electrodes have the same polarity.
Preferably, the plurality of viewing angle control electrodes are arranged in a column or a row.
Preferably, the bias voltage comprises an alternating voltage having a first amplitude and an alternating voltage having a second amplitude, wherein the first amplitude is larger than the second amplitude.
Preferably, the polarity of the alternating voltage having the first amplitude is changed according to a change in polarity of the driving voltage applied to the corresponding pixel electrode.
Preferably, the polarity change frequency of the alternating voltage having the second amplitude is one half or the same as the polarity change frequency of the driving voltage applied to the pixel electrode.
Preferably, the alternating voltage having the first amplitude and the alternating voltage having the second amplitude are sine waves, square waves, triangular waves or sawtooth waves.
According to another aspect of the present invention, there is provided a display device including: the display panel comprises a driving chip and the display panel, wherein the driving chip is used for applying alternating voltages with different polarities and a first amplitude to the visual angle control electrode in a first mode; and applying voltages of a second amplitude having different polarities to the viewing angle control electrodes in a second mode.
According to a third aspect of the present invention, there is provided a driving method of the display device described above, the driving method comprising:
applying alternating voltages with different polarities and a first amplitude to the viewing angle control electrodes in a first mode;
and applying an alternating voltage having a second amplitude and different polarity to the viewing angle control electrode in a second mode.
The invention provides a display panel, a display device and a driving method thereof.A visual angle control electrode is arranged on a second substrate (a color filter substrate) of the liquid crystal display device, and when a narrow visual angle is needed, voltage is applied to the visual angle control electrode so as to generate an electric field which is vertical to the panel direction between the visual angle control electrode and a pixel electrode and a common electrode which are arranged on a first substrate (an array substrate), so that liquid crystal molecules generate inclination angle change in the vertical direction, and the purposes of oblique-view dark-state light leakage, contrast reduction, visual angle reduction and narrow-visual-angle display are achieved. Thus, by adjusting the voltage applied to the viewing angle control electrode, switching between the wide viewing angle and narrow viewing angle modes can be achieved.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:
FIG. 1 shows a schematic diagram of a display panel of an embodiment of the invention;
FIGS. 2A-2B are schematic diagrams illustrating viewing angle control electrodes of a display panel according to an embodiment of the present invention;
3A-3B illustrate schematic diagrams of a display panel of an embodiment of the present invention;
FIGS. 4A-4D are schematic diagrams illustrating the polarity change of the driving voltage of the pixel electrode of the display device according to the embodiment of the invention;
fig. 5A to 5D are waveform diagrams showing voltages applied to viewing angle control electrodes in the display device according to the embodiment of the present invention;
FIG. 6 shows a schematic view of a display device of an embodiment of the invention;
fig. 7 shows a flowchart of a driving method of a display device according to an embodiment of the present invention.
Detailed Description
Various embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Like elements in the various figures are denoted by the same or similar reference numerals. For purposes of clarity, the various features in the drawings are not necessarily drawn to scale.
The present invention may be embodied in various forms, some examples of which are described below.
Fig. 1 is a schematic view of a display panel according to an embodiment of the present invention.
As shown in fig. 1, the liquid crystal display panel according to the embodiment of the present invention includes a first substrate 1, a second substrate 2, and a liquid crystal layer 3.
The first substrate 1, also commonly referred to as a thin film transistor array substrate, is provided with a plurality of pixel electrodes 11 and a plurality of common electrodes 12 arranged in an array. The first substrate may include a transparent substrate 13, driving components (e.g., TFT devices) formed on the substrate, and wiring between the various components, etc., which are not shown in fig. 1 for ease of understanding the present invention. The pixel electrode 11 and the common electrode 12 are disposed on a substrate 13. An electric field in the horizontal direction can be formed between the pixel electrode 11 and the corresponding common electrode 12, so that the liquid crystal molecules in one pixel region are controlled to turn, and the passing light intensity is adjusted. The pixel electrode 11 and the corresponding common electrode 12 may be formed using a transparent conductive material such as Indium Tin Oxide (ITO).
The liquid crystal layer 3 is disposed between the first substrate 1 and the second substrate 2. The liquid crystal molecules in the liquid crystal layer 3 are aligned in advance. In an initial state, the liquid crystal layer 3 prevents polarized light transmitted through the first substrate 1 from finally passing through an uppermost polarizing film (not shown in fig. 1).
The second substrate 2 is disposed opposite to the first substrate 1, and a plurality of viewing angle control electrodes 21 are disposed thereon in an array. In this embodiment, the second substrate is a color filter substrate. In this embodiment, the viewing angle control electrodes 21 are strip-shaped control electrodes, and the odd-numbered viewing angle control electrodes and the even-numbered viewing angle control electrodes in the viewing angle control electrodes 21 are respectively used for applying bias voltages with different polarities to adjust the viewing angle of the display panel.
FIGS. 2A-2B are schematic diagrams illustrating viewing angle control electrodes of a display panel according to an embodiment of the present invention; as shown in fig. 2, the plurality of viewing angle control electrodes 21 are arranged in a manner consistent with a driving voltage inversion manner of the plurality of pixel electrodes 11. In this embodiment, when the driving voltage inversion method of the pixel electrodes 11 is column inversion, the viewing angle control electrodes 21 are arranged in a column, and the orthographic projection of each viewing angle control electrode 21 on the first substrate 1 is located within the orthographic projection of each column of pixel electrodes 11 on the first substrate 1; when the driving voltage inversion method of the plurality of pixel electrodes 11 is line inversion, the plurality of viewing angle control electrodes 21 are arranged in a line, and the orthographic projection of each viewing angle control electrode 21 on the first substrate 1 is located within the orthographic projection of each line of pixel electrodes 11 on the first substrate 1.
Preferably, odd-numbered viewing angle control electrodes of the plurality of viewing angle control electrodes 21 have the same polarity of driving voltage as odd-numbered pixel electrodes of the plurality of pixel electrodes 11; the even-numbered viewing angle control electrodes among the plurality of viewing angle control electrodes 21 and the even-numbered pixel electrodes among the plurality of pixel electrodes 11 have the same polarity of the driving voltage.
Preferably, the odd-numbered viewing angle control electrodes and the even-numbered viewing angle control electrodes of the plurality of viewing angle control electrodes 21 are staggered.
In the present embodiment, the bias voltage applied to the viewing angle control electrode 21 includes an alternating voltage having a first amplitude and an alternating voltage having a second amplitude. Wherein, when an alternating voltage with a first amplitude is applied on the viewing angle control electrode 21, the display panel works in a first mode; when an ac voltage having a second amplitude is applied to the viewing angle control electrode 21, the display panel operates in a second mode. The polarity of the alternating voltage having the first amplitude is changed according to the polarity change of the driving voltage applied to the corresponding pixel electrode. The polarity change frequency of the alternating voltage having the second amplitude is one half or the same as the polarity change frequency of the driving voltage applied to the pixel electrode. The first amplitude is greater than the second amplitude.
Of course, those skilled in the art will readily understand that the liquid crystal display device further includes other necessary components such as an alignment film, a supporting member for supporting the second substrate so as to be kept at a predetermined distance from the first substrate, and the like, as well as a backlight source, a light guide plate, a polarizing film, and the like. The above components are not shown in fig. 1 in order to facilitate understanding of the technical solution of the present invention.
Fig. 3A-3B show schematic diagrams of a display panel of an embodiment of the invention. Fig. 3A is a schematic view of the liquid crystal display panel in the second mode, i.e., the wide viewing angle mode, and fig. 3B is a schematic view of the liquid crystal display panel in the first mode, i.e., the narrow viewing angle mode.
As shown in fig. 3A, in the wide viewing angle mode, a lower second amplitude of ac voltage is applied to the viewing angle control electrode 21. The second amplitude is close to zero and may be, for example, 0.05V. Accordingly, in the region where the liquid crystal layer 3 is located, the electric field is mainly the horizontal electric field formed between the pixel electrode 11 and the common electrode 12, and the tilt angle of the liquid crystal molecules aligned in the horizontal direction with respect to the horizontal direction is zero or very small. At this time, since the liquid crystal molecules are in-plane inverted, the entire display panel has a wide viewing angle.
As shown in fig. 3B, the viewing angle control electrode 21 is applied with a voltage having a first, higher amplitude, which may be, for example, 5V, when in the narrow viewing angle mode. Thereby, an electric field in the vertical direction is formed between the viewing angle control electrode 21 and the pixel electrode 11 and the common viewing electrode 12 of the first substrate 1. The liquid crystal molecules are simultaneously influenced by the electric field in the vertical direction and the electric field in the horizontal direction, and can be turned in the vertical direction besides changing the polarization direction of polarized light by turning in a plane, so that the inclination angle between the axial direction and the horizontal direction of the liquid crystal molecules is increased. This further causes the oblique dark state to leak light, the contrast is reduced, and the viewing angle is reduced. Thereby, the viewing angle of the entire liquid crystal display device is narrowed.
Therefore, in the embodiment of the invention, the viewing angle control electrode is arranged on the second substrate (the color filter substrate) of the display panel, and when a narrow viewing angle is required, a voltage is applied to the viewing angle control electrode so as to generate an electric field which is vertical to the panel direction between the viewing angle control electrode and the pixel electrode and the common electrode which are arranged on the first substrate (the array substrate), so that the liquid crystal molecules generate inclination angle change in the vertical direction, and the purposes of oblique dark state light leakage, contrast reduction, viewing angle reduction and narrow viewing angle display are achieved. Thus, by adjusting the voltage applied to the viewing angle control electrode, switching between the wide viewing angle and narrow viewing angle modes can be achieved.
Fig. 4A-4D are schematic diagrams illustrating polarity changes of driving voltages of pixel electrodes of a display panel according to an embodiment of the invention. The display panel shown in fig. 4A and 4B drives the pixel electrodes in a column inversion manner, that is, in the first frame, the odd columns are driven with positive voltages, the even columns are driven with negative voltages, in the next frame, the odd columns are driven with negative voltages, and the even columns are driven with positive voltages.
In this inversion scheme, the odd-numbered column viewing angle control electrodes 21 are connected to each other and an orthogonal alternating voltage having a first amplitude is output thereto in the first mode, and the even-numbered column viewing angle control electrodes 21 are connected to each other and a negative alternating voltage having a first amplitude is output thereto, the polarity of which alternating voltage changes with the polarity of the driving voltage of the pixel electrodes. That is, the alternating voltage applied to the viewing angle control electrode 21 has the same frequency as the display panel refresh frequency, which may be, for example, 120 Hz. Therefore, the voltage difference between the pixel electrode and the visual angle control electrode can be kept to be the same in both odd columns and even columns, and cannot be greatly changed along with the inversion of the pixel electrode driving voltage, so that the inclination angle of liquid crystal molecules in a narrow visual angle mode is kept unchanged.
Meanwhile, in the second mode, the positive ac voltage having the second amplitude is output to the odd-numbered column viewing angle control electrodes 21, and the negative ac voltage having the second amplitude is output to the even-numbered column viewing angle control electrodes 21. The frequency of the alternating voltage may be the same as, or half of, the refresh frequency of the display panel. In the second mode, the voltage with a certain amplitude is still applied to the viewing angle control electrode 21 to prevent the capacitor of the viewing angle control electrode 21 from being charged and discharged, so the frequency of the ac voltage can be properly lower than the refresh frequency, and the system load is reduced.
Meanwhile, either the first pattern of the alternating voltage or the second pattern of the alternating voltage may be formed as a sine wave, a square wave, a triangular wave, or a sawtooth wave, for example, as shown in fig. 5A to 5D.
The display panel shown in fig. 4C and 4D drives the pixel electrodes in a line inversion manner, that is, in the first frame, the odd-numbered lines are driven with a positive voltage, the even-numbered lines are driven with a negative voltage, and in the next frame, the odd-numbered lines are driven with a negative voltage, and the even-numbered lines are driven with a positive voltage.
In this inversion scheme, the odd-numbered row viewing angle control electrodes 21 are connected to each other and a positive ac voltage having a first magnitude is output thereto in the first mode, and the even-numbered row viewing angle control electrodes 21 are connected to each other and a negative ac voltage having a first magnitude is output thereto, the polarity of the ac voltage being changed according to the change in the polarity of the driving voltage of the pixel voltage. That is, the alternating voltage applied to the viewing angle control electrode 21 has the same frequency as the display panel refresh frequency, which may be, for example, 120 Hz. Therefore, the voltage difference between the pixel electrode and the visual angle control electrode can be kept to be the same in both the odd lines and the even lines, and cannot be greatly changed along with the inversion of the pixel electrode driving voltage, so that the inclination angle of the liquid crystal molecules is kept unchanged in the narrow visual angle mode.
Meanwhile, in the second mode, the positive ac voltage having the second amplitude is output to the odd-numbered row viewing angle control electrodes 21, and the negative ac voltage having the second amplitude is output to the even-numbered row viewing angle control electrodes 21. The frequency of the alternating voltage may be the same as, or half of, the refresh frequency of the display panel. In the second mode, the voltage with a certain amplitude is still applied to the viewing angle control electrode 21 to prevent the capacitor of the viewing angle control electrode 21 from being charged and discharged, so the frequency of the ac voltage can be properly lower than the refresh frequency, and the system load is reduced.
Meanwhile, either the first pattern of the alternating voltage or the second pattern of the alternating voltage may be formed as a sine wave, a square wave, a triangular wave, or a sawtooth wave, for example, as shown in fig. 5A to 5D.
Fig. 6 is a schematic diagram of a display device according to an embodiment of the present invention. As shown in fig. 6, the display device includes: a driving chip 4 and the display panel.
Wherein, the driving chip 4 is used for applying alternating voltages with different polarities and a first amplitude to the viewing angle control electrode 21 in a first mode; a voltage having a second magnitude and different polarity is applied to the viewing angle control electrode 21 in the second mode.
The driving chip 4 is disposed in a region outside the display region of the liquid crystal display panel, and is configured to apply a voltage having a first amplitude to the viewing angle control electrode 21 in the first mode, and apply a voltage having a second amplitude to the viewing angle control electrode 21 in the second mode. In an embodiment of the invention, the first mode is a narrow viewing angle mode, the second mode is a wide viewing angle mode, and the first amplitude is higher than the second amplitude.
When the pixel electrodes 11 adopt the column inversion, in the first mode, the driving chip 4 applies a positive ac voltage having a first amplitude to the odd-numbered column viewing angle control electrodes (211, 213, 215, etc.), and applies a negative ac voltage having a first amplitude to the even-numbered column viewing angle control electrodes (212, 214, 216, etc.).
When the pixel electrodes 11 adopt the row inversion, in the first mode, the driving chip 4 applies a positive ac voltage having a first amplitude to the odd-numbered row viewing angle control electrodes (211, 213, 215, etc.), and applies a negative ac voltage having a first amplitude to the even-numbered row viewing angle control electrodes (212, 214, 216, etc.).
Further, in order to prevent the adjustment accuracy of light from being lowered due to the electric field always having the same direction, the adjustment accuracy is usually maintained by switching the polarity of the driving voltage of the pixel electrode, and adjacent pixels are prevented from affecting each other.
Fig. 7 is a flowchart of a driving method of a liquid crystal display device according to an embodiment of the present invention.
As shown in fig. 7, the driving method of the embodiment of the present invention is for driving the display panel shown in fig. 1, the method including:
step 710 of applying a voltage having a first amplitude to the viewing angle control electrode in a first mode.
Further, the voltage having the first amplitude is an alternating voltage, and in the first mode, the polarity of the alternating voltage having the first amplitude changes with the change of the driving voltage applied to the corresponding pixel electrode.
Further, the voltage having the second amplitude is an alternating voltage, and in the second mode, the polarity change frequency of the alternating voltage having the second amplitude is one half or the same as the polarity change frequency of the driving voltage applied to the pixel electrode.
Further, the alternating voltage with the first amplitude and the alternating voltage with the second amplitude are sine waves, square waves, triangular waves or sawtooth waves.
Further, the amplitude of the alternating voltage with the first amplitude is larger than the amplitude of the alternating voltage with the second amplitude.
Therefore, when a narrow viewing angle is needed, a voltage is applied to the viewing angle control electrode to enable an electric field which is perpendicular to the panel direction to be generated between the viewing angle control electrode and the pixel electrode and the common electrode which are arranged on the first substrate (array substrate), so that liquid crystal molecules generate inclination angle change in the perpendicular direction, and the purposes of oblique dark state light leakage, contrast reduction, viewing angle reduction and narrow viewing angle display are achieved. Therefore, by adjusting the voltage applied to the viewing angle control electrode, switching between the wide viewing angle and the narrow viewing angle modes can be achieved.
While embodiments in accordance with the invention have been described above, these embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments described. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention and various embodiments with various modifications as are suited to the particular use contemplated. The scope of the invention should be determined from the following claims.
Claims (7)
1. A display panel, comprising:
a first substrate provided with a plurality of pixel electrodes and a plurality of common electrodes in an array;
a second substrate provided with a plurality of viewing angle control electrodes in an array;
a liquid crystal layer disposed between the first substrate and the second substrate;
the arrangement mode of the plurality of viewing angle control electrodes is consistent with the driving voltage inversion mode of the plurality of pixel electrodes;
the odd-numbered viewing angle control electrodes and the even-numbered viewing angle control electrodes in the plurality of viewing angle control electrodes are respectively used for applying bias voltages with different polarities so as to adjust the viewing angle of the display panel;
the bias voltage comprises an alternating voltage having a first amplitude in a first mode and an alternating voltage having a second amplitude in a second mode, wherein the first amplitude is greater than the second amplitude;
the polarity of the alternating voltage with the first amplitude is changed along with the polarity change of the driving voltage applied to the corresponding pixel electrode;
the polarity change frequency of the alternating voltage with the second amplitude is half of or the same as that of the driving voltage applied to the pixel electrode;
the orthographic projection of the plurality of viewing angle control electrodes on the first substrate is positioned in the orthographic projection of the plurality of pixel electrodes on the first substrate.
2. The display panel of claim 1, wherein odd-numbered viewing angle control electrodes and even-numbered viewing angle control electrodes of the plurality of viewing angle control electrodes are staggered.
3. The display panel of claim 1, wherein odd-numbered ones of the plurality of viewing angle control electrodes have a same polarity of driving voltage as odd-numbered ones of the plurality of pixel electrodes; the even-numbered viewing angle control electrode and the driving voltage of the even-numbered pixel electrode in the plurality of pixel electrodes have the same polarity.
4. The display panel of claim 1, wherein the plurality of viewing angle control electrodes are arranged in columns or rows.
5. The display panel of claim 1, the alternating voltage having the first amplitude and the alternating voltage having the second amplitude being a sine wave, a square wave, a triangular wave, or a sawtooth wave.
6. A display device, comprising: a driver chip and a display panel as claimed in any one of claims 1 to 5,
the driving chip is used for applying alternating voltages with different polarities and a first amplitude value to the visual angle control electrode in a first mode;
and applying voltages of a second amplitude having different polarities to the viewing angle control electrodes in a second mode.
7. A driving method of the display device according to claim 6, the driving method comprising:
applying alternating voltages with different polarities and a first amplitude to the viewing angle control electrodes in a first mode;
and applying an alternating voltage having a second amplitude and different polarity to the viewing angle control electrode in a second mode.
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| JP6848043B2 (en) | 2016-08-08 | 2021-03-24 | 昆山龍騰光電有限公司 | Liquid crystal display device that can switch the viewing angle and its viewing angle switching method |
| WO2018049559A1 (en) * | 2016-09-13 | 2018-03-22 | 昆山龙腾光电有限公司 | Liquid crystal display device with switchable viewing angle, and viewing angle switching method |
| KR102177397B1 (en) | 2016-12-01 | 2020-11-13 | 인포비젼 옵토일렉트로닉스 (쿤산) 주식회사 | A liquid crystal display device capable of changing the viewing angle and a method for changing the viewing angle |
| TWI597551B (en) * | 2017-03-03 | 2017-09-01 | 友達光電股份有限公司 | Display device |
| US11187928B2 (en) | 2017-07-04 | 2021-11-30 | Infovision Optoelectronics (Kunshan) Co., Ltd. | Method for driving liquid crystal display device capable of switching between wide viewing angle and narrow viewing angle |
| CN108563078B (en) * | 2018-01-24 | 2021-08-17 | 昆山龙腾光电股份有限公司 | Liquid crystal display device and driving method |
| CN108983462A (en) * | 2018-08-27 | 2018-12-11 | 昆山龙腾光电有限公司 | The driving method of liquid crystal display device |
| CN109116639B (en) * | 2018-09-27 | 2021-07-20 | 昆山龙腾光电股份有限公司 | Liquid crystal display device and driving method thereof |
| CN109298571B (en) * | 2018-10-30 | 2021-07-13 | 昆山龙腾光电股份有限公司 | Liquid crystal display device and driving method |
| CN111656271B (en) * | 2019-01-04 | 2023-05-23 | 京东方科技集团股份有限公司 | Peep-proof circuit, driving method thereof and display device |
| CN113631997B (en) * | 2020-01-13 | 2024-04-09 | 京东方科技集团股份有限公司 | Liquid crystal panel and display device |
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