CN109001928B - Driving method of liquid crystal display panel, liquid crystal display panel and display device - Google Patents
Driving method of liquid crystal display panel, liquid crystal display panel and display device Download PDFInfo
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- CN109001928B CN109001928B CN201811011875.6A CN201811011875A CN109001928B CN 109001928 B CN109001928 B CN 109001928B CN 201811011875 A CN201811011875 A CN 201811011875A CN 109001928 B CN109001928 B CN 109001928B
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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 127
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000010438 heat treatment Methods 0.000 claims abstract description 126
- 239000000758 substrate Substances 0.000 claims description 44
- 238000010586 diagram Methods 0.000 description 11
- 239000010409 thin film Substances 0.000 description 11
- 230000008569 process Effects 0.000 description 6
- 239000000463 material Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000005684 electric field Effects 0.000 description 3
- 239000010408 film Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 2
- 229920005591 polysilicon Polymers 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000002390 adhesive tape Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000001808 coupling effect Effects 0.000 description 1
- 238000005265 energy consumption Methods 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
- G02F1/133382—Heating or cooling of liquid crystal cells other than for activation, e.g. circuits or arrangements for temperature control, stabilisation or uniform distribution over the cell
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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
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Abstract
The embodiment of the invention discloses a driving method of a liquid crystal display panel, the liquid crystal display panel and a display device. The driving cycle of the liquid crystal display panel comprises a display phase and a non-display phase, wherein the non-display phase comprises a heating phase, and the driving method comprises the following steps: in the display stage, a common voltage signal is applied to a common electrode of the liquid crystal display panel; in the heating stage, a heating signal is applied to a common electrode of the liquid crystal display panel. According to the embodiment of the invention, the heating signal is applied to the common electrode of the liquid crystal display panel in the heating stage, and the heat generated by the common electrode can be directly applied to the liquid crystal molecules in the liquid crystal display panel, so that the aim of quickly starting the liquid crystal display panel in a low-temperature environment is fulfilled, the display quality of the liquid crystal display device is ensured, and the problems of low heating efficiency and low speed of the liquid crystal display screen in low-temperature work are solved.
Description
Technical Field
Embodiments of the present invention relate to organic light emitting display technologies, and in particular, to a driving method of a liquid crystal display panel, and a display device.
Background
The liquid crystal display has the characteristics of low power consumption, high definition, long service life, small volume, light weight and the like, and is widely applied to various devices needing to realize display.
When the temperature is lower, the liquid crystal material becomes viscous, the response speed becomes slow after electrification, and a dynamic image is trailing or even can not be displayed; when the temperature is lower, the liquid crystal state of the liquid crystal material disappears, and the liquid crystal material becomes crystalline, so that the picture display cannot be performed. Therefore, the liquid crystal display needs to be heated, the temperature is controlled within a reasonable range, the liquid crystal circulation is ensured, and the normal operation of the liquid crystal display is realized.
In the prior art, a heating structure of a liquid crystal display is generally a heating plate attached to the outside of a liquid crystal panel, the heating plate transfers heat to a liquid crystal layer through air and a glass substrate on one side of a thin film transistor, and the heat transfer process is slow and high in energy consumption; gaps can exist due to the adoption of a frame pasting design, water vapor can be left in the gaps due to the moisture of materials such as frame pasting adhesive tapes or the like or during the assembly process, a heating plate is required for heating when the liquid crystal display is started quickly in a low-temperature environment, and the liquid crystal display can exchange heat with the environment, so that the heating cannot be completely uniform, and the water vapor can be unevenly condensed to generate black shadows; and the heating plate needs to be designed independently, and has a complex structure and high cost.
Disclosure of Invention
The embodiment of the invention provides a driving method of a liquid crystal display panel, the liquid crystal display panel and a display device, and aims to solve the problems of low heating efficiency and low speed of a liquid crystal display screen during low-temperature work.
In a first aspect, an embodiment of the present invention provides a driving method for a liquid crystal display panel, where a driving cycle of the liquid crystal display panel includes a display phase and a non-display phase, and the non-display phase includes a heating phase, the driving method including:
in the display stage, applying a common voltage signal to a common electrode of the liquid crystal display panel;
and in the heating stage, a heating signal is applied to the common electrode of the liquid crystal display panel.
In a second aspect, an embodiment of the invention further provides a liquid crystal display panel, including a plurality of pixel units,
each pixel unit comprises a pixel electrode and a common electrode;
the common electrode is multiplexed as a heating electrode.
Optionally, the driving cycle of the liquid crystal display panel includes a display phase and a non-display phase, and the non-display phase includes a heating phase;
in the display stage, applying a common voltage signal to a common electrode of the liquid crystal display panel;
and in the heating stage, a heating signal is applied to the common electrode of the liquid crystal display panel.
In a third aspect, an embodiment of the present invention provides a display device, including the liquid crystal display panel described above.
The embodiment of the invention provides a driving method of a liquid crystal display panel, wherein a driving cycle of the liquid crystal display panel comprises a display stage and a non-display stage, wherein the non-display stage comprises a heating stage, and a common voltage signal is applied to a common electrode of the liquid crystal display panel in the display stage; in the heating stage, a heating signal is applied to a common electrode of the liquid crystal display panel. The heating signal is applied to the common electrode of the liquid crystal display panel in the heating stage of the non-display stage, and the heat generated by the common electrode can be directly applied to liquid crystal molecules in the liquid crystal display panel, so that the aim of quickly starting the liquid crystal display panel in a low-temperature environment is fulfilled, the display quality of the liquid crystal display device is ensured, and the problems of low heating efficiency and low speed of the liquid crystal display screen in the low-temperature working process are solved.
Drawings
Fig. 1 is a timing diagram of a common electrode voltage in a driving method of a liquid crystal display panel according to an embodiment of the invention;
fig. 2 is a schematic diagram of an equivalent circuit of a driving circuit of a liquid crystal display panel according to an embodiment of the invention;
FIG. 3 is a schematic diagram of a TFT gate voltage timing sequence of an LCD panel according to an embodiment of the present invention;
FIG. 4 is a timing diagram of an input control signal of the LCD panel according to the present invention;
fig. 5 is a schematic top view illustrating an lcd panel according to an embodiment of the present invention;
FIG. 6 is a schematic cross-sectional view taken along line A-A' of FIG. 5;
FIG. 7 is a schematic view of another cross-sectional structure taken along line A-A' of FIG. 5;
fig. 8 is a partial schematic view of an array substrate according to an embodiment of the invention;
fig. 9 is a partial schematic view of another array substrate according to an embodiment of the invention;
fig. 10 is a partial schematic view of another array substrate according to an embodiment of the invention;
fig. 11 is a schematic structural diagram of a display device according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. It should be noted that the terms "upper", "lower", "left", "right", and the like used in the description of the embodiments of the present invention are used in the angle shown in the drawings, and should not be construed as limiting the embodiments of the present invention. In addition, in this context, it is also to be understood that when an element is referred to as being "on" or "under" another element, it can be directly formed on "or" under "the other element or be indirectly formed on" or "under" the other element through an intermediate element. The terms "first," "second," and the like, are used for descriptive purposes only and not for purposes of limitation, and do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The specific meanings of the above-described terms in the present invention can be understood in specific cases by those skilled in the art.
The embodiment of the invention provides a driving method of a liquid crystal display panel, wherein a driving cycle of the liquid crystal display panel comprises a display stage and a non-display stage, the non-display stage comprises a heating stage, and the driving method comprises the following steps: in the display stage, a common voltage signal is applied to a common electrode of the liquid crystal display panel; in the heating stage, a heating signal is applied to a common electrode of the liquid crystal display panel.
According to the technical scheme of the embodiment of the invention, the heating signal is applied to the common electrode of the liquid crystal display panel in the heating stage of the non-display stage, and the heat generated by the common electrode can be directly applied to the liquid crystal molecules in the liquid crystal display panel, so that the aim of quickly starting the liquid crystal display panel in a low-temperature environment is fulfilled, the display quality of the liquid crystal display device is ensured, and the problems of low heating efficiency and low speed of the liquid crystal display screen in low-temperature work are solved.
Fig. 1 is a timing diagram of a common electrode voltage in a driving method of a liquid crystal display panel according to an embodiment of the invention. The driving period T of the liquid crystal display panel comprises a display period T1 and a non-display period T2, the non-display period T2 comprises a heating period T21, and the driving method comprises the following steps: in the display period T1, a common voltage signal V1 is applied to the common electrode of the liquid crystal display panel; in the heating period T21, a heating signal V2 is applied to the common electrode of the liquid crystal display panel.
It is understood that the liquid crystal display panel includes a pixel electrode and a common electrode, the pixel electrode and the common electrode form a capacitance, and an electric field for controlling liquid crystal molecules is formed by applying a pixel voltage and a common voltage to the pixel electrode and the common electrode, respectively, during a display period, for example, the common voltage signal V1 may be a voltage signal of 5V. In the heating stage of the non-display stage, a heating signal which can make the common electrode generate heat, for example, a voltage signal of 20V, is applied to the common electrode, so that the common electrode forms a heating loop, the common electrode is used as the heating electrode, and since the common electrode has a certain resistance, a current is formed in the common electrode to make the common electrode generate heat to heat the liquid crystal molecules, and the specific heating voltage is determined according to the actual environment temperature condition, which is not limited in the embodiment of the present invention.
It should be noted that fig. 1 schematically illustrates two driving cycles, the heating period T21 shown in fig. 1 is a part of the non-display period T2, and in some embodiments, the non-display period T2 may be entirely used as the heating period T21.
Fig. 2 is a schematic diagram of an equivalent circuit of a liquid crystal display panel driving circuit according to an embodiment of the invention. Referring to fig. 2, the equivalent circuit includes a plurality of thin film transistors TFT, m gate lines G1, G2, … … Gm-1, Gm, n data lines S1, S2, … … Sn-1, Sn, the gate lines being electrically connected to the gate electrodes of the TFTs, the data lines being electrically connected to the source electrodes of the TFTs, the pixel electrodes being electrically connected to the drain electrodes of the TFTs, the pixel electrodes forming capacitances with the common electrodes. Taking a TFT as an N-channel as an example, fig. 3 is a schematic timing diagram of a gate voltage of a TFT of a liquid crystal display panel according to an embodiment of the present invention, referring to fig. 3, during displaying, when a gate line Gm-1 of an m-1 th row provides a high level signal for the TFT, the TFT of the m-1 th row is turned on, a data voltage on a data line charges a pixel electrode, and pixels of the m-1 th row display, a common electrode voltage is a common voltage signal, which may be, for example, about 5V; when the gate line Gm-1 of the (m-1) th row is at a low level, the TFT is turned off, and the voltage of the pixel electrode is kept at the voltage of the data line; a period of time Δ t is before the gate line Gm of the mth row is at a high level, and a heating signal, for example, a voltage of 20V, is applied to the common electrode for heating the liquid crystal molecules (at this time, the gate line signal of the mth-1 row has changed to a low voltage signal, the TFTs of the mth-1 row are turned off, and the voltage difference between the pixel electrode and the common electrode is not changed by the capacitive coupling effect, which does not affect the normal display). When the m-th row gate line Gm supplies the m-th row TFT with a high level, the common electrode voltage returns to 5V again for display.
Optionally, the heating phase comprises a time interval between display phases of adjacent rows of pixel cells.
It can be understood that, referring to fig. 3, the time interval between the display phases of the pixel cells in the adjacent rows is the time Δ t between the high level of the gate line in the m-1 th row and the high level of the gate line Gm in the m th row.
Optionally, in the power-down process of the driving chip, a scanning control signal is applied to each scanning line of the liquid crystal display panel to control the gate of the transistor connected to each row of pixel units to be turned on.
With reference to fig. 3, when the display is completed and the driving chip is powered off (time period t1 in the figure), the scan control signal is applied to all the scan lines, in this embodiment, the scan control signal is at high level, all the gates of the TFTs are turned on, and the residual charges in the pixel electrodes are led out of the pixel electrodes, so that the adverse display effects such as image sticking can be effectively prevented from occurring in the next display.
Optionally, the heating phase comprises a time interval between adjacent frame displays.
It can be understood that when the liquid crystal display panel displays a picture, there is a non-display time in the middle of switching from one frame to the next frame, and there is a free time in the time of displaying one frame, so that the liquid crystal molecules can be heated by applying a heating signal to the common electrode in the time of displaying no picture between adjacent frames.
Optionally, the heating phase includes one or more of an adjacent effective pulse interval period of the vertical synchronization signal, a display front-segment idle period, and a display rear-segment idle period.
Fig. 4 is a timing diagram of an input control signal of the lcd panel according to an embodiment of the present invention. Referring to fig. 4, VS represents a vertical synchronization signal, HS represents a horizontal synchronization signal, and VS is active high to periodically control the data signal displayed by the pixels of each frame. VS one period vt (vertical Total time) is a frame, there is a retrace time between every two adjacent frames, VS has a low level time, corresponding to the VS low level pulse width VSW of the HS signal, during which the scanning signal does not work, the data output is in an invalid state, and this time is the interval time of the adjacent effective pulses of the vertical synchronization signal. All HS signals capable of effectively controlling data output in one frame form effective time VVD (vertical Valid data) of a vertical synchronization signal. Comparing the timing diagrams of VS and HS, the effective pulse time of the vertical synchronizing signal also includes displaying the idle time VBP (vertical Back Port) of the Back segment, VBP represents the ineffective line scanning time at the beginning of the frame after the vertical synchronizing period, displaying the idle time VFP (vertical Front Port) of the Front segment, and VFP represents the ineffective line scanning time from the end of outputting one frame data to the beginning of the vertical synchronizing period of the next frame. One or more of the VSW, VBP, VFP times between one frame and the next may be used for heating.
The embodiment of the invention also provides a liquid crystal display panel, which comprises a plurality of pixel units, wherein each pixel unit comprises a pixel electrode and a common electrode; the common electrode is multiplexed as a heating electrode.
It is understood that the liquid crystal display panel includes a pixel electrode and a common electrode, the pixel electrode and the common electrode form a capacitance, and an electric field for controlling liquid crystal molecules is formed by applying a pixel voltage and a common voltage to the pixel electrode and the common electrode, respectively, during a display period, for example, the common voltage signal may be a voltage signal of 5V. In the heating stage of the non-display stage, a heating signal capable of heating the common electrode, for example, a voltage signal of 20V, is applied to the common electrode, and the common electrode is used as the heating electrode to heat the liquid crystal molecules, and the specific heating voltage is determined according to the actual ambient temperature condition, which is not limited in the embodiment of the present invention.
Optionally, the driving cycle of the liquid crystal display panel includes a display phase and a non-display phase, and the non-display phase includes a heating phase; in the display stage, a common voltage signal is applied to a common electrode of the liquid crystal display panel; in the heating stage, a heating signal is applied to a common electrode of the liquid crystal display panel.
Optionally, the heating phase comprises a time interval between display phases of adjacent rows of pixel cells. Optionally, the heating phase comprises a time interval between adjacent frame displays. Further, the heating stage includes one or more of an adjacent effective pulse interval period of the vertical synchronization signal, a display front-segment idle period, and a display rear-segment idle period.
In a specific implementation, the heating may be performed by using a time interval between the display stages of the pixel units in the adjacent rows, or by using a time interval between the display frames of the adjacent frames, or by using a time interval between the display stages of the pixel units in the adjacent rows and a time interval between the display frames of the adjacent frames at the same time, which is not limited in the embodiment of the present invention.
According to the technical scheme of the embodiment of the invention, the heating signal is applied to the common electrode of the liquid crystal display panel in the heating stage in the non-display stage, and the heat generated by the common electrode can be directly applied to the liquid crystal molecules in the liquid crystal display panel, so that the aim of quickly starting the liquid crystal display panel in a low-temperature environment is fulfilled, the display quality of the liquid crystal display device is ensured, and the problems of low heating efficiency and low speed of the liquid crystal display screen in low-temperature work are solved.
Fig. 5 is a schematic top view of a liquid crystal display panel according to an embodiment of the invention, and fig. 6 is a schematic cross-sectional view taken along the sectional line a-a' of fig. 5. Referring to fig. 5 and 6, the liquid crystal display panel includes a plurality of pixel units 100, each pixel unit 100 including a pixel electrode 110 and a common electrode 120, the common electrode 120 being multiplexed as a heating electrode. Optionally, the liquid crystal display panel includes a color film substrate 200 and an array substrate 300 that are disposed opposite to each other, and a liquid crystal layer 400 located between the color film substrate 200 and the array substrate 300; the common electrode 120 is located on one side of the array substrate 300 close to the color filter substrate 400.
Illustratively, the array substrate 300 includes a substrate 310, in this embodiment, the pixel electrode 110 is located on the array substrate 300, and an insulating layer 320 is disposed between the pixel electrode 110 and the common electrode 120. The common electrode 120 may be provided in a structure including a plurality of stripe electrodes to form a wide viewing angle type display panel with the pixel electrodes. The array substrate 300 is further provided with a thin film transistor TFT301, the TFT301 includes a polysilicon active layer 3011, a gate 3012, a source 3013 and a drain 3014, wherein a gate line (not shown) is electrically connected to the gate 3012 of the TFT301 for controlling the TFT301 to be turned on or off, a data line (not shown) is electrically connected to the source 3013 of the TFT301, and the pixel electrode 110 is electrically connected to the drain 3014 of the TFT 301. The color filter substrate 200 is provided with a filter, a black matrix, and other structures, which are not shown in fig. 6.
It is to be understood that the TFT301 shown in fig. 6 is only an exemplary bottom-gate structure, and in particular, a top-gate structure may be adopted, which is not limited in the embodiment of the present invention.
Fig. 7 is another schematic cross-sectional view taken along the line a-a' in fig. 5. Referring to fig. 7, optionally, the liquid crystal display panel includes a color filter substrate 200 and an array substrate 300 that are disposed opposite to each other, and a liquid crystal layer 400 located between the color filter substrate 200 and the array substrate 300; the common electrode 120 is located on one side of the color film substrate 200 close to the array substrate 300.
Illustratively, the array substrate 300 includes a substrate 310, in this embodiment, the pixel electrode 110 is located on the array substrate 300, and the common electrode 120 is disposed on the color filter substrate. The common electrode 120 may be provided in a planar electrode structure to form a Twisted Nematic (TN) type display panel with the pixel electrode. It is understood that the array substrate 300 is further provided with a thin film transistor TFT301, and the TFT301 includes a polysilicon active layer 3011, a gate 3012, a source 3013 and a drain 3014, wherein a gate line (not shown) is electrically connected to the gate 3012 of the TFT301 for controlling the TFT301 to be turned on or off, a data line (not shown) is electrically connected to the source 3013 of the TFT301, and the pixel electrode 110 is electrically connected to the drain 3014 of the TFT 301. The color filter substrate 200 is provided with a filter, a black matrix, and other structures, which are not shown in fig. 7.
It is to be understood that the TFT301 shown in fig. 7 is a bottom gate structure, which is only schematic, and in particular, a top gate structure may be adopted, which is not limited in the embodiment of the present invention.
For example, taking the common electrode on the array substrate as an example, fig. 8 is a partial schematic view of an array substrate according to an embodiment of the present invention. Referring to fig. 8, optionally, the liquid crystal display panel further includes: a first switch 330 and a second switch 340, the output ends of the first switch 330 and the second switch 340 are electrically connected with the common electrode 120; an input terminal of the first switch 340 is electrically connected to the common voltage signal pad 360, and an input terminal of the second switch 340 is electrically connected to the first heating signal pad 370.
The first switch 330 and the second switch 340 may be TFTs, sources of the first switch 330 and the second switch 340 are electrically connected to the common voltage signal pad 360 and the first heating signal pad 370, respectively, drains of the first switch 330 and the second switch 340 are electrically connected to the common electrode 120, and gates of the first switch 330 and the second switch are electrically connected to a control signal line (not shown) for controlling on/off of the two switches.
It is understood that the common voltage signal pad and the first heating signal pad may be located on the common electrode control module, and the common electrode control module may be located in the peripheral non-display area of the array substrate, or may be located on the total driving circuit board used for the liquid crystal display panel, or may be located on the driving circuit board used for the separately located common electrode control structure, which is not limited in this embodiment of the present invention.
Optionally, in the display stage, the first switch 330 is turned on, the second switch 340 is turned off, and the common voltage signal pad 360 applies the common voltage signal to the common electrode 120; in the heating stage, the first switch 330 and the second switch 340 are both turned on, and the first heating signal pad 370 applies the first heating signal to the common electrode 120.
It can be understood that, in the display stage, a pixel voltage signal is applied to the pixel electrode, a common voltage signal is applied to the common electrode, the pixel electrode and the common electrode form an electric field, and the liquid crystal deflection is controlled to realize display, at the moment, the pixel electrode and the common electrode form a polar plate of the electrode, so that only the first switch is needed to be conducted, a common voltage signal is applied to the common electrode, the common electrode reaches a preset potential, and no current is formed after charging is completed; in the heating stage, the common electrode is used as a heating electrode, and current is formed in the common electrode to enable the common electrode to generate heat, so that the first switch and the second switch are both switched on, and the voltage of the first heating signal is set to be greater than that of the common voltage signal, so that the common electrode forms a heating loop, and the heating process is completed.
Optionally, the connection between the output terminal of the first switch 330 and the common electrode 120 and the connection between the output terminal of the second switch 340 and the common electrode 120 are located at different side edges of the common electrode 120.
For example, the joints of the first switch 330 and the second switch 340 shown in fig. 8 and the common electrode 120 are located at two adjacent sides of the common electrode 120, and it can be understood that the joints of the first switch 330 and the second switch 340 and the common electrode 120 can also be located at two opposite sides of the common electrode 120, and since the common electrode 120 covers the whole display area of the display panel, that is, the area of the common electrode 120 is large, in specific implementation, the joints of the first switch 330 and the second switch 340 and the common electrode 120 are located at two different sides of the common electrode 120, so that the heat generated by the common electrode 120 during heating can be more uniform, and the heating effect is better.
Fig. 9 is a partial schematic view of another array substrate according to an embodiment of the invention. Referring to fig. 9, optionally, the liquid crystal display panel further includes: a third switch 350, an output terminal of the third switch 350 being electrically connected to the common electrode 120; an input terminal of the third switch 350 is electrically connected to the second heating signal pad 380.
Optionally, in the heating phase, the first switch 330 is turned off, the second switch 340 and the third switch 350 are turned on, the first heating signal pad 370 applies the first heating signal to the common electrode 120, and the second heating signal pad 380 applies the second heating signal to the common electrode 120.
It can be understood that, since the first switch 330 is turned on to provide a common voltage signal (e.g. 5V) to the common electrode 120, the first heating signal requires a higher voltage during heating, which requires a higher performance for the second switch 340, and by setting the third switch 350, a second heating signal (e.g. close to 0) lower than the common voltage can be set, and the circuit formed by the second switch 340, the common electrode 120 and the third switch 350 can generate the same heating current to effectively reduce the voltage of the first heating signal compared with the circuit formed by the second switch 340, the common electrode 120 and the first switch 330.
Alternatively, with continued reference to fig. 9, the output of the first switch 330 and the output of the third switch 350 are electrically connected to the same location of the common electrode. The arrangement can reduce wiring and is beneficial to simplifying the process flow.
Fig. 10 is a partial schematic view of another array substrate according to an embodiment of the invention. Referring to fig. 10, alternatively, the number of the first switches 330 is plural. The output ends of two adjacent first switches 330 are spaced from the joint of the common electrode 120 by a predetermined distance.
Illustratively, three first switches 330 are shown in fig. 10, and output terminals are connected to three sides of the common electrode 120, respectively. It can be understood that, because the common electrode is fully distributed in the whole display area of the display panel, that is, the common electrode has a large area, when the display panel is implemented specifically, a plurality of first switches can be arranged, and the preset distance is arranged at the connection position of the output ends of two adjacent first switches and the common electrode, so that the display effect can be prevented from being influenced by the uneven potential of the common electrode in the display stage.
Optionally, the first switch is an N-channel thin film transistor, and the second switch and the third switch are P-channel thin film transistors; or the first switch is a P-channel thin film transistor, and the second switch and the third switch are N-channel thin film transistors; and the control ends of the first switch, the second switch and the third switch are connected with the same control signal line.
It can be understood that, since the first switch is turned on and the second switch and the third switch are turned off in the display period and the first switch is turned off and the second switch and the third switch are turned on in the heating period, the channel types of the second switches are set to be the same and the channel types of the first switch and the second switch are different, and the three switches can be controlled first by the same control signal, thereby reducing wiring.
Optionally, the first switch, the second switch and the third switch are all N-channel thin film transistors, or are all P-channel thin film transistors; the control ends of the second switch and the third switch are connected with the same control signal line, and the control ends of the first switch and the second switch are connected with different control signal lines.
It can be understood that the three switches can be all the same type of thin film transistors, and are simultaneously manufactured by the same process, so that the manufacturing process of the display panel is simplified.
Fig. 11 is a schematic structural diagram of a display device according to an embodiment of the present invention. Referring to fig. 11, the display device 11 includes any one of the liquid crystal display panels 20 according to the embodiments of the present invention. The display device 11 may be a display device having a display function, such as a mobile phone, a computer, or a vehicle-mounted display device.
The display device provided by the embodiment of the invention comprises the liquid crystal display panel provided by any embodiment, and has the same and corresponding beneficial effects with the liquid crystal display panel, and the description is omitted here.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious modifications, rearrangements, combinations and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (12)
1. A driving method of a liquid crystal display panel, wherein a driving cycle of the liquid crystal display panel includes a display phase and a non-display phase, the non-display phase includes a heating phase, the driving method comprising:
in the display stage, applying a common voltage signal to a common electrode of the liquid crystal display panel;
in the heating stage, a heating signal is applied to a common electrode of the liquid crystal display panel;
the liquid crystal display panel comprises a first switch and a second switch, and the output ends of the first switch and the second switch are electrically connected with the common electrode; the input end of the first switch is electrically connected with the common voltage signal bonding pad, and the input end of the second switch is electrically connected with the first heating signal bonding pad;
in the display phase, applying a common voltage signal to a common electrode of the liquid crystal display panel, including:
in the display stage, the first switch is controlled to be switched on, the second switch is controlled to be switched off, and the common voltage signal pad applies a common voltage signal to the common electrode;
in the heating phase, applying a heating signal to a common electrode of the liquid crystal display panel, including:
in the heating stage, the first switch and the second switch are controlled to be conducted, and the first heating signal pad applies a first heating signal to the common electrode; or,
the liquid crystal display panel further comprises a third switch, and the output end of the third switch is electrically connected with the common electrode; the input end of the third switch is electrically connected with the second heating signal bonding pad; in the heating phase, applying a heating signal to a common electrode of the liquid crystal display panel, including:
and in the heating stage, the first switch is controlled to be closed, the second switch and the third switch are controlled to be conducted, the first heating signal pad applies a first heating signal to the common electrode, and the second heating signal pad applies a second heating signal to the common electrode.
2. The driving method as claimed in claim 1, wherein the heating phase comprises a time interval between adjacent rows of pixel cell display phases.
3. The driving method according to claim 1, wherein the heating phase comprises a time interval between adjacent frame display screens.
4. The driving method according to claim 1, wherein the heating phase includes one or more of adjacent effective pulse interval periods, display front-end idle periods, and display rear-end idle periods of the vertical synchronization signal.
5. The driving method according to claim 1, wherein during power-down of the driving chip, a scan control signal is applied to each scan line of the liquid crystal display panel to control the gate of the transistor connected to each row of pixel units to be turned on.
6. The liquid crystal display panel is characterized by comprising a plurality of pixel units, wherein each pixel unit comprises a pixel electrode and a common electrode;
the common electrode is reused as a heating electrode;
the driving period of the liquid crystal display panel comprises a display stage and a non-display stage, wherein the non-display stage comprises a heating stage;
in the display stage, applying a common voltage signal to a common electrode of the liquid crystal display panel;
in the heating stage, a heating signal is applied to a common electrode of the liquid crystal display panel;
the liquid crystal display panel further comprises a first switch and a second switch, and output ends of the first switch and the second switch are electrically connected with the common electrode;
the input end of the first switch is electrically connected with the common voltage signal bonding pad, and the input end of the second switch is electrically connected with the first heating signal bonding pad.
7. The liquid crystal display panel according to claim 6, wherein the liquid crystal display panel comprises a color film substrate and an array substrate which are arranged oppositely, and a liquid crystal layer located between the color film substrate and the array substrate;
the common electrode is located on one side, close to the color film substrate, of the array substrate.
8. The liquid crystal display panel according to claim 6, wherein the liquid crystal display panel comprises a color film substrate and an array substrate which are arranged oppositely, and a liquid crystal layer located between the color film substrate and the array substrate;
the common electrode is located on one side, close to the array substrate, of the color film substrate.
9. The liquid crystal display panel according to claim 6, wherein in the display phase, the first switch is turned on, the second switch is turned off, and the common voltage signal pad applies a common voltage signal to the common electrode;
in the heating stage, the first switch and the second switch are both turned on, and the first heating signal pad applies a first heating signal to the common electrode.
10. The liquid crystal display panel according to claim 6, further comprising:
the output end of the third switch is electrically connected with the common electrode;
and the input end of the third switch is electrically connected with the second heating signal bonding pad.
11. The liquid crystal display panel according to claim 10, wherein in the heating period, the first switch is turned off, the second switch and the third switch are turned on, the first heating signal pad applies a first heating signal to the common electrode, and the second heating signal pad applies a second heating signal to the common electrode.
12. A display device comprising the liquid crystal display panel according to any one of claims 6 to 11.
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| CN111999925B (en) * | 2020-08-28 | 2023-07-04 | 上海天马微电子有限公司 | Display panel, driving method thereof and display device |
| CN112346269B (en) * | 2020-11-10 | 2022-10-11 | 厦门天马微电子有限公司 | Display panel, heating driving method thereof and display device |
| CN112859416B (en) * | 2021-03-12 | 2023-04-21 | 厦门天马微电子有限公司 | Liquid crystal display panel and liquid crystal display device |
| CN113238403B (en) * | 2021-05-21 | 2022-07-19 | 厦门天马微电子有限公司 | Display panel and display device |
| CN114265250B (en) * | 2021-12-21 | 2023-04-07 | 苏州华星光电技术有限公司 | Liquid crystal display panel and display device |
| CN118311809B (en) * | 2024-06-11 | 2024-09-06 | 惠科股份有限公司 | Display panel, preparation method thereof and display device |
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