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CN106249496B - Pixel unit, pixel driving circuit and driving method - Google Patents

Pixel unit, pixel driving circuit and driving method Download PDF

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Publication number
CN106249496B
CN106249496B CN201610796454.3A CN201610796454A CN106249496B CN 106249496 B CN106249496 B CN 106249496B CN 201610796454 A CN201610796454 A CN 201610796454A CN 106249496 B CN106249496 B CN 106249496B
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pixel
sub
switching element
pixels
data line
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CN106249496A (en
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崔博钦
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TCL China Star Optoelectronics Technology Co Ltd
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Shenzhen China Star Optoelectronics Technology Co Ltd
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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
    • G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
    • G02F1/1362—Active matrix addressed cells
    • 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
    • G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
    • G02F1/1362—Active matrix addressed cells
    • G02F1/13624—Active matrix addressed cells having more than one switching element per pixel
    • 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
    • G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
    • G02F1/1362—Active matrix addressed cells
    • G02F1/136286—Wiring, e.g. gate line, drain line
    • 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
    • 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
    • G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
    • G02F2201/52—RGB geometrical arrangements

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mathematical Physics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Optics & Photonics (AREA)
  • Computer Hardware Design (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Liquid Crystal Display Device Control (AREA)

Abstract

The invention discloses a pixel unit, a pixel driving circuit and a driving method, wherein a first sub-pixel, a second sub-pixel and a third sub-pixel of the pixel unit are sequentially arranged along the direction of a data line; a first scanning line is arranged between the first sub-pixel and the second sub-pixel; and a second scanning line is arranged between the second sub-pixel and the third sub-pixel. The pixel driving circuit comprises a plurality of switch elements, wherein the switch elements are mutually connected to form charging paths corresponding to different sub-pixels respectively, one ends of the charging paths corresponding to the different sub-pixels are connected to the data line together, and the other ends of the charging paths corresponding to the different sub-pixels are connected to pixel electrodes corresponding to the different sub-pixels respectively; the plurality of switch elements are respectively connected with the scanning lines, and the charging paths corresponding to different sub-pixels are opened according to scanning signals transmitted by the scanning lines. The scheme is beneficial to improving the aperture opening ratio of the liquid crystal display while reducing the cost of the liquid crystal display.

Description

Pixel unit, pixel driving circuit and driving method
Technical Field
The invention belongs to the field of liquid crystal display, and particularly relates to a pixel unit, a pixel driving circuit and a driving method.
Background
A liquid crystal display generally comprises two substrates, i.e., a color filter substrate and an array substrate. The liquid crystal display realizes the display of a liquid crystal picture by driving the pixel unit matrix.
One pixel unit is further divided into a plurality of sub-pixels. The pixel unit in the prior art generally comprises three sub-pixels. Taking RGB three-component color as an example, three sub-pixels are sequentially arranged along a row direction of the pixel unit matrix, the three sub-pixels correspond to a common scanning line along the row direction, and a data line along a column direction is respectively arranged inside each sub-pixel.
As shown in fig. 1, the sub-pixels RGB are located in a pixel unit row, and are sequentially arranged as a first sub-pixel, a second sub-pixel, and a third sub-pixel from left to right, and a first data line D1, a second data line D2, and a third data line D3 for controlling a column of sub-pixels are respectively penetrated through the three sub-pixels, and one scanning line S1 is simultaneously penetrated through the three sub-pixels, and the scanning line is used for controlling all the sub-pixels of each pixel unit located on a row of the pixel unit matrix.
The main problem in the prior art is that the Scan lines and the Data lines are driven by a Scan driver circuit (Scan COF) and a Data driver circuit (Data COF), respectively, and the Data driver circuit is more complex in design, so the chip price of the Data driver circuit is much higher than that of the Scan driver circuit. If the lcd has n rows of pixel units, at least 3n rows of scan lines and a scan driving circuit chip for driving the 3n rows of scan lines are required, which results in higher cost of the lcd. The present invention proposes a solution to the above problems.
Disclosure of Invention
One of the technical problems to be solved by the present invention is to provide a solution that can reduce the cost of the liquid crystal display.
In order to solve the above technical problem, an embodiment of the present application first provides a pixel unit, which is divided into a first sub-pixel, a second sub-pixel and a third sub-pixel, wherein the first sub-pixel, the second sub-pixel and the third sub-pixel are sequentially arranged along a data line direction; a first scanning line is arranged between the first sub-pixel and the second sub-pixel; and a second scanning line is arranged between the second sub-pixel and the third sub-pixel.
The embodiment of the present application further provides a pixel driving circuit for driving the pixel unit, including a plurality of switching elements, where the switching elements are connected to each other to form charging paths corresponding to different sub-pixels, one end of each of the charging paths corresponding to different sub-pixels is commonly connected to the data line, and the other end of each of the charging paths corresponding to different sub-pixels is connected to a pixel electrode corresponding to different sub-pixels; the plurality of switch elements are respectively connected with the scanning lines, the charging paths corresponding to different sub-pixels are opened according to scanning signals transmitted by the scanning lines, and the sub-pixels are charged through data signals provided by the data lines.
Preferably, the pixel driving circuit includes a first switching element, a second switching element, a third switching element, and a fourth switching element: the control ends of the first switch element and the second switch element are connected with the first scanning line, and the signal input ends of the first switch element and the second switch element are connected with the data line; the control ends of the third switching element and the fourth switching element are connected to the second scanning line, and the signal input end of the fourth switching element is connected with the data line; the signal output end of the first switch element is connected with the pixel electrode corresponding to the first sub-pixel; a signal output end of the second switching element is connected with a signal input end of the third switching element, and a signal output end of the third switching element is connected with a pixel electrode corresponding to the second sub-pixel; and the signal output end of the fourth switching element is connected with the pixel electrode corresponding to the third sub-pixel.
Preferably, the pixel driving circuit includes a first switching element, a second switching element, and a third switching element: the first switch element is connected with the first scanning line, and the signal input end of the first switch element is connected with the data line; the control ends of the second switching element and the third switching element are connected to the second scanning line together, and the signal input end of the third switching element is connected with the data line; the signal output end of the first switch element is connected with the pixel electrode corresponding to the first sub-pixel; a signal input end of the second switching element is connected with a signal output end of the first switching element, and a signal output end of the second switching element is connected with a pixel electrode corresponding to the second sub-pixel; and the signal output end of the third switching element is connected with the pixel electrode corresponding to the third sub-pixel.
Preferably, the pixel driving circuit includes a first switching element, a second switching element, and a third switching element: the first switch element and the control end of the second switch element are connected to the first scanning line together, and the signal input end of the first switch element is connected with the data line; the third switching element is connected with the second scanning line, and the signal input end of the third switching element is connected with the data line; the signal output end of the first switch element is connected with the pixel electrode corresponding to the first sub-pixel; the signal output end of the third switching element is connected with the pixel electrode corresponding to the third sub-pixel; and the signal input end of the second switching element is connected with the signal output end of the third switching element, and the signal output end of the second switching element is connected with the pixel electrode corresponding to the second sub-pixel.
Preferably, the switching element includes an N-type thin film transistor and/or a P-type thin film transistor.
In another aspect, a driving method for driving the pixel driving circuit is provided, including: causing the data line to output a data voltage corresponding to the first charged sub-pixel; starting a charging path corresponding to the first charged sub-pixel by a scanning line, and closing the charging path corresponding to the first charged sub-pixel after the sub-pixel is charged to a set pixel voltage; and repeating the steps, sequentially switching the output of the data line into the data voltages corresponding to the other two sub-pixels, and respectively starting the charging paths corresponding to the other two sub-pixels to charge the other two sub-pixels.
Preferably, the data voltage output from the data line is switched during the period in which the all-charge path is turned off.
Preferably, the first charged sub-pixel includes sub-pixels which are connected to each other by at least two switching elements to constitute a charging path thereof.
Preferably, the first charged sub-pixel comprises a second sub-pixel.
Compared with the prior art, one or more embodiments in the above scheme can have the following advantages or beneficial effects:
the driving of three sub-pixels in one pixel unit is realized by utilizing two scanning lines and one data line, so that the cost of the liquid crystal display is reduced, and the aperture opening ratio of the liquid crystal display is improved.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the technology or prior art of the present application and are incorporated in and constitute a part of this specification. The drawings expressing the embodiments of the present application are used for explaining the technical solutions of the present application, and should not be construed as limiting the technical solutions of the present application.
FIG. 1 is a schematic diagram of a pixel unit in the prior art;
FIG. 2 is a schematic structural diagram of a pixel unit according to a first embodiment of the present invention;
FIG. 3 is a diagram illustrating a pixel driving circuit according to a second embodiment of the present invention;
FIG. 4 is a schematic diagram of a pixel driving circuit according to a third embodiment of the present invention;
FIG. 5 is a diagram illustrating a pixel driving circuit according to a fourth embodiment of the present invention;
FIGS. 6 a-6 d are schematic layout designs of a pixel driving circuit according to an embodiment of the invention;
fig. 7 is a flow chart illustrating a driving method according to a fifth embodiment of the invention;
FIG. 8 is a signal timing diagram illustrating a driving method according to an embodiment of the present invention;
fig. 9 is a waveform diagram of a pixel voltage according to a driving method of an embodiment of the invention.
Detailed Description
The following detailed description of the embodiments of the present invention will be provided with reference to the accompanying drawings and examples, so that how to apply the technical means to solve the technical problems and achieve the corresponding technical effects can be fully understood and implemented. The embodiments and the features of the embodiments can be combined without conflict, and the technical solutions formed are all within the scope of the present invention.
The first embodiment:
fig. 2 is a schematic structural diagram of a pixel unit according to a first embodiment of the invention, wherein the pixel unit is composed of three sub-pixels, i.e., a first sub-pixel P1, a second sub-pixel P2 and a third sub-pixel P3.
Specifically, the first sub-pixel P1, the second sub-pixel P2, and the third sub-pixel P3 are all arranged in the direction of the data line D1. A first scan line S1 is disposed between the first sub-pixel P1 and the second sub-pixel P2, and a second scan line S2 is disposed between the second sub-pixel P2 and the third sub-pixel P3.
In the embodiment of the invention, the three sub-pixels included in the pixel unit are positioned in different pixel unit rows, correspond to the same data line, and respectively correspond to three different scanning lines. The number of data lines used is reduced to one third of the prior art.
Although the number of the scan lines is increased to three times of the prior art, the cost of the driving chip of the data lines is much higher than that of the driving chip of the scan lines, and especially with the mature goa (gate On array) technology of the liquid crystal panel in recent years, the material cost is not increased when the number of the scan lines is three times, so the embodiment of the invention can achieve the purpose of reducing the cost of the liquid crystal display.
Further, in order to drive the pixel unit, in another embodiment of the present invention, a corresponding pixel driving circuit is further provided, and the following description is made with reference to a specific embodiment.
Second embodiment:
the pixel driving circuit in the embodiment of the invention comprises a plurality of switching elements, and the switching elements are mutually connected to form charging paths corresponding to different sub-pixels respectively.
One end of each charging path corresponding to different sub-pixels is connected with the data line, and the other end of each charging path corresponding to different sub-pixels is respectively connected with the pixel electrodes corresponding to different sub-pixels, namely, each sub-pixel shares one data line through the respective charging path.
Furthermore, the plurality of switch elements are respectively connected with different scanning lines, the charging paths corresponding to different sub-pixels are opened according to scanning signals transmitted by the scanning lines, and the sub-pixels are charged through data signals provided by the data lines.
Each of the switching elements may be an N-type thin film transistor and/or a P-type thin film transistor.
Fig. 3 is a schematic structural diagram of a pixel driving circuit according to a second embodiment of the invention, in fig. 3, C _ lc _1, C _ lc _2, and C _ lc _3 respectively represent liquid crystal capacitors corresponding to the sub-pixels, C _ st _1, C _ st _2, and C _ st _3 respectively represent storage capacitors corresponding to the sub-pixels, and connection points of the liquid crystal capacitors C _ lc _1, C _ lc _2, and C _ lc _3 and the storage capacitors C _ st _1, C _ st _2, and C _ st _3 can be used for representing pixel electrodes corresponding to the sub-pixels.
As shown in fig. 3, the pixel driving circuit includes a first switching element T1, a second switching element T2, a third switching element T3 and a fourth switching element T4.
The control terminals of the first switch element T1 and the second switch element T2 are commonly connected to the first scan line S1, and the signal input terminals of T1 and T2 are commonly connected to the data line D1.
Control terminals of the third switching element T3 and the fourth switching element T4 are commonly connected to the second scan line S2, and a signal input terminal of the fourth switching element T4 is connected to the data line D1.
A signal output terminal of the first switching element T1 is connected to a pixel electrode corresponding to the first subpixel P1.
A signal output terminal of the second switching element T2 is connected to a signal input terminal of the third switching element T3, and a signal output terminal of the third switching element T3 is connected to a pixel electrode corresponding to the second subpixel P2.
A signal output terminal of the fourth switching element T4 is connected to the pixel electrode corresponding to the third sub-pixel P3.
The pixel driving circuit of the embodiment of the invention realizes the driving of three sub-pixels in one pixel unit by using two scanning lines and one data line, and can reduce the cost of the liquid crystal display.
The third embodiment:
fig. 4 is a schematic structural diagram of a pixel driving circuit according to a third embodiment of the invention, in fig. 4, C _ lc _1, C _ lc _2, and C _ lc _3 respectively represent liquid crystal capacitors corresponding to the sub-pixels, C _ st _1, C _ st _2, and C _ st _3 respectively represent storage capacitors corresponding to the sub-pixels, and connection points of the liquid crystal capacitors C _ lc _1, C _ lc _2, and C _ lc _3 and the storage capacitors C _ st _1, C _ st _2, and C _ st _3 can be used for representing pixel electrodes corresponding to the sub-pixels.
As shown in fig. 4, the pixel driving circuit includes a first switching element T1, a second switching element T2 and a third switching element T3.
The first switching element T1 is connected to the first scan line S1, and the signal input terminal of T1 is connected to the data line D1.
The control terminals of the second switching element T2 and the third switching element T3 are commonly connected to the second scan line S2, and the signal input terminal of the third switching element T3 is connected to the data line D1.
A signal output terminal of the first switching element T1 is connected to a pixel electrode corresponding to the first subpixel P1.
A signal input terminal of the second switching element T2 is connected to a signal output terminal of the first switching element T1, and a signal output terminal of the second switching element T2 is connected to a pixel electrode corresponding to the second subpixel P2.
A signal output terminal of the third switching element T3 is connected to a pixel electrode corresponding to the third subpixel P3.
The pixel driving circuit of the embodiment of the invention realizes the driving of three sub-pixels in one pixel unit by utilizing two scanning lines and one data line, and only uses three switching elements, thereby further reducing the using number of the switching elements, reducing the cost of the liquid crystal display and improving the aperture opening ratio of the liquid crystal display.
The fourth embodiment:
fig. 5 is a schematic structural diagram of a pixel driving circuit according to a fourth embodiment of the invention, in fig. 5, C _ lc _1, C _ lc _2, and C _ lc _3 respectively represent liquid crystal capacitors corresponding to the sub-pixels, C _ st _1, C _ st _2, and C _ st _3 respectively represent storage capacitors corresponding to the sub-pixels, and connection points of the liquid crystal capacitors C _ lc _1, C _ lc _2, and C _ lc _3 and the storage capacitors C _ st _1, C _ st _2, and C _ st _3 can be used for representing pixel electrodes corresponding to the sub-pixels.
As shown in fig. 5, the pixel driving circuit includes a first switching element T1, a second switching element T2 and a third switching element T3.
The first switch element T1 and the control terminal of the second switch element T2 are commonly connected to the first scan line S1, and the signal input terminal of the first switch element T1 is connected to the data line D1.
The third switching element T3 is connected to the second scan line S2, and the signal input terminal of T3 is connected to the data line D1.
A signal output terminal of the first switching element T1 is connected to a pixel electrode corresponding to the first subpixel P1.
A signal output terminal of the third switching element T3 is connected to a pixel electrode corresponding to the third subpixel P3.
A signal input terminal of the second switching element T2 is connected to a signal output terminal of the third switching element T3, and a signal output terminal of the second switching element T2 is connected to a pixel electrode corresponding to the second subpixel P2.
The pixel driving circuit of the embodiment of the invention realizes the driving of three sub-pixels in one pixel unit by utilizing two scanning lines and one data line, and only uses three switching elements, thereby further reducing the using number of the switching elements, reducing the cost of the liquid crystal display and improving the aperture opening ratio of the liquid crystal display.
Fig. 6a to 6d are schematic layout diagrams of a pixel driving circuit according to an embodiment of the present invention, where fig. 6a is a layout of a driving circuit provided with four switching elements, fig. 6b to 6d are layout designs of a driving circuit provided with three switching elements, and fig. 6d is a layout form in which a first scanning line S1 and a second scanning line S2 are arranged adjacently. The pixel driving circuit of each of the above embodiments can be completed by using five masks or four masks in the manufacturing process of the array substrate.
The driving method based on the pixel driving circuits described above will be further described with reference to specific embodiments.
Fifth embodiment:
fig. 7 is a flowchart illustrating a driving method according to a fifth embodiment of the present invention, as shown in the figure, the driving method includes:
step S710 outputs a data voltage corresponding to the first charged subpixel to the data line.
Step S720, a charging path corresponding to the first charged sub-pixel is opened by the scan line, and the charging path corresponding to the first charged sub-pixel is closed after the sub-pixel is charged to a predetermined pixel voltage.
Step S730, repeating step S710 and step S720, sequentially switching the output of the data line to the data voltages corresponding to the other two sub-pixels, and respectively turning on the charging paths corresponding to the other two sub-pixels to charge the other two sub-pixels.
Further, fig. 8 is a signal timing diagram of a driving method according to an embodiment of the present invention, fig. 9 is a waveform diagram of a pixel voltage of the driving method according to the embodiment of the present invention, which is described below with reference to fig. 8 and 9, where fig. 8 and 9 correspond to a pixel driving circuit in the second embodiment.
In the first charging period, the first scan line S1 and the second scan line S2 both output high level signals, and the first switch element T1, the second switch element T2, the third switch element T3 and the fourth switch element T4 are all turned on, and at this time, the data line D1 outputs a data voltage signal corresponding to the second subpixel P2, which is set as V2.
Since each of the switching elements is turned on, the charging paths of the three sub-pixels are all opened, and thus the first sub-pixel P1, the second sub-pixel P2, and the third sub-pixel P3 are all charged to V2, as shown in fig. 9.
During the second charging period, the first scan line S1 outputs a high signal, the second scan line S2 outputs a low signal, the first switching element T1 and the second switching element T2 are turned on, the third switching element T3 and the fourth switching element T4 are turned off, and at this time, the data line D1 outputs a data voltage signal corresponding to the first subpixel P1, which is set as V1.
As can be seen from the on state of the switching element, only the charging path corresponding to the first sub-pixel P1 is turned on, and the charging paths corresponding to the second sub-pixel P2 and the third sub-pixel P3 are turned off. Therefore, only the first subpixel P1 is charged to V1 during the second charging time, as shown in fig. 9.
During the third charging time, the second scan line S2 outputs a high level signal, the first scan line S1 outputs a low level signal, the first switching element T1 and the second switching element T2 are turned off, the third switching element T3 and the fourth switching element T4 are turned on, and at this time, the data line D3 outputs a data voltage signal corresponding to the third subpixel P3, which is set as V3.
As can be seen from the on state of the switching element, only the charging path corresponding to the third sub-pixel P3 is turned on, and the charging paths corresponding to the first sub-pixel P1 and the second sub-pixel P2 are turned off. Therefore, only the third subpixel P3 is charged to V3 during the third charging time, as shown in fig. 9.
In the embodiment of the invention, the pixel units corresponding to two scanning lines and one data line are charged through three consecutive charging times.
It should be noted that, since the sub-pixels of the pixel unit are charged in a time-sharing manner, the charging time of each sub-pixel should be reduced to approximately one third of the charging time of the original pixel unit, which can be realized by improving the internal structure of the switching element, compared to the structure of the pixel unit corresponding to one scan line and three data lines in the prior art.
In addition, when the second sub-pixel P2 is charged, i.e., during the first charging period, the first sub-pixel P1 and the third sub-pixel P3 may have a voltage error for a certain period of time, as shown in fig. 9. This period of time is approximately equal to one unit of charging time, and occupies only about 1/1000 of one frame of picture in terms of display of one frame of picture. Optically performs as well as the prior art and therefore does not degrade the visual experience of the viewer.
It should be noted that the operation of the data voltage outputted from the data line D1 switch needs to be performed when all the charging paths corresponding to the respective sub-pixels are turned off, and the change of the data line output signal occurs during the period when the output of the scan line is all at low level as shown in fig. 8.
In addition, when determining the first charged subpixel, a subpixel whose charging path is formed by at least two switching elements connected to each other, such as the second subpixel P2 in the above-described embodiment, should be selected.
In the driving method in the prior art, the required driving signals should be implemented at least when the number of the data lines multiplied by the number of the scanning lines is greater than three, and in this embodiment, the number of the driving signals can be saved, so as to reduce the total number of the data lines and the scanning lines, and improve the aperture ratio of the liquid crystal display and the display effect while reducing the cost of the driving component of the liquid crystal display.
Although the embodiments of the present invention have been described above, the above descriptions are only for the convenience of understanding the present invention, and are not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (6)

1. A pixel driving circuit for driving a pixel unit comprises a plurality of switch elements, wherein the pixel unit is divided into a first sub-pixel, a second sub-pixel and a third sub-pixel, and the first sub-pixel, the second sub-pixel and the third sub-pixel are sequentially arranged along the direction of a data line; a first scanning line is arranged between the first sub-pixel and the second sub-pixel; a second scanning line is arranged between the second sub-pixel and the third sub-pixel;
the plurality of switch elements are connected with each other to form charging paths corresponding to different sub-pixels respectively, one ends of the charging paths corresponding to the different sub-pixels are connected to the data line together, and the other ends of the charging paths corresponding to the different sub-pixels are connected to pixel electrodes corresponding to the different sub-pixels respectively;
the plurality of switch elements are respectively connected with the scanning lines, the charging paths corresponding to different sub-pixels are opened according to scanning signals transmitted by the scanning lines, and the sub-pixels are charged through data signals provided by the data lines; wherein,
the pixel driving circuit comprises a first switching element, a second switching element, a third switching element and a fourth switching element:
the control ends of the first switch element and the second switch element are connected with the first scanning line, and the signal input ends of the first switch element and the second switch element are connected with the data line;
the control ends of the third switching element and the fourth switching element are connected to the second scanning line, and the signal input end of the fourth switching element is connected with the data line;
the signal output end of the first switch element is connected with the pixel electrode corresponding to the first sub-pixel;
a signal output end of the second switching element is connected with a signal input end of the third switching element, and a signal output end of the third switching element is connected with a pixel electrode corresponding to the second sub-pixel;
a signal output end of the fourth switching element is connected with a pixel electrode corresponding to the third sub-pixel; in the alternative, the first and second sets of the first,
the pixel driving circuit comprises a first switching element, a second switching element and a third switching element:
the first switch element is connected with the first scanning line, and the signal input end of the first switch element is connected with the data line;
the control ends of the second switching element and the third switching element are connected to the second scanning line together, and the signal input end of the third switching element is connected with the data line;
the signal output end of the first switch element is connected with the pixel electrode corresponding to the first sub-pixel;
a signal input end of the second switching element is connected with a signal output end of the first switching element, and a signal output end of the second switching element is connected with a pixel electrode corresponding to the second sub-pixel;
the signal output end of the third switching element is connected with the pixel electrode corresponding to the third sub-pixel; in the alternative, the first and second sets of the first,
the pixel driving circuit comprises a first switching element, a second switching element and a third switching element:
the first switch element and the control end of the second switch element are connected to the first scanning line together, and the signal input end of the first switch element is connected with the data line;
the third switching element is connected with the second scanning line, and the signal input end of the third switching element is connected with the data line;
the signal output end of the first switch element is connected with the pixel electrode corresponding to the first sub-pixel;
the signal output end of the third switching element is connected with the pixel electrode corresponding to the third sub-pixel;
and the signal input end of the second switching element is connected with the signal output end of the third switching element, and the signal output end of the second switching element is connected with the pixel electrode corresponding to the second sub-pixel.
2. The pixel driving circuit according to claim 1, wherein the switching element comprises an N-type thin film transistor and/or a P-type thin film transistor.
3. A driving method for driving the pixel driving circuit as claimed in claim 1 or 2, comprising:
causing the data line to output a data voltage corresponding to the first charged sub-pixel;
starting a charging path corresponding to the first charged sub-pixel by a scanning line, and closing the charging path corresponding to the first charged sub-pixel after the sub-pixel is charged to a set pixel voltage;
and repeating the steps, sequentially switching the output of the data line into the data voltages corresponding to the other two sub-pixels, and respectively starting the charging paths corresponding to the other two sub-pixels to charge the other two sub-pixels.
4. The driving method according to claim 3, wherein the data voltage output from the data line is switched during a period in which all the charging paths are turned off.
5. The driving method according to claim 4, wherein the first charged sub-pixel comprises sub-pixels connected to each other by at least two switching elements to constitute a charging path thereof.
6. The driving method according to claim 5, wherein the first charged sub-pixel comprises a second sub-pixel.
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