CN109192115B

CN109192115B - Detection circuit and liquid crystal display device

Info

Publication number: CN109192115B
Application number: CN201811062952.0A
Authority: CN
Inventors: 王金烨; 张鼎
Original assignee: InfoVision Optoelectronics Kunshan Co Ltd
Current assignee: InfoVision Optoelectronics Kunshan Co Ltd
Priority date: 2018-09-12
Filing date: 2018-09-12
Publication date: 2021-09-21
Anticipated expiration: 2038-09-12
Also published as: CN109192115A

Abstract

The invention provides a detection circuit, which comprises a plurality of switch elements, at least three data signal lines and at least two control signal lines. In each time period of each frame, if the control signal on one control signal line is at a high level, controlling the corresponding switch elements to be switched on, and further controlling part of the sub-pixels to be connected with the corresponding data signal line of the at least three data signal lines to obtain corresponding polarity; accordingly, every time a frame passes, the corresponding control signals on the at least two control signal lines cause all the sub-pixels to be connected to a corresponding one of the at least three data signal lines through the plurality of switching elements to obtain the corresponding polarities, and the polarities of the same sub-pixel of the adjacent pixel units in the same row are made opposite. The invention also provides a liquid crystal display device. The detection circuit and the liquid crystal display device can inhibit the flicker of gray-scale pictures and pure-color pictures and save frames.

Description

Detection circuit and liquid crystal display device

Technical Field

The invention relates to the field of liquid crystal display, in particular to a detection circuit and a liquid crystal display device.

Background

With the development of liquid crystal display technology, the demand for display panels is increasing, and the competition of the liquid crystal panel industry is also increasing, so that panel manufacturers are required to have exquisite technology and excessively high yield.

However, in the detection process of the liquid crystal display device, if the polarities of two adjacent pixels on the display panel are the same, the liquid crystal display device will flicker a gray-scale picture and a pure-color picture, so that the quality of the display panel cannot be accurately detected. Fig. 1 is a first detection circuit and a waveform diagram in the prior art, as shown in fig. 1, the detection circuit switches sub-pixels on a display panel to receive a corresponding image signal sequentially every frame through a plurality of switching elements, three data signal lines and a control signal line, but in the same frame, the polarities of driving voltages of two adjacent same sub-pixels are substantially the same, so that the frame may flicker. Fig. 2 is a diagram of a second detection circuit and waveforms in the prior art, in order to solve the problem of image flicker appearing in fig. 1, three data signal lines are added to the detection circuit, so that sub-pixels on the display panel receive a corresponding image signal in a sequential manner and each frame is switched, and the polarities of two adjacent sub-pixels on a row are opposite, thereby achieving the purpose of suppressing gray scale and pure color image flicker. However, the technical scheme increases the area of the frame, and the invention provides a solution for saving the frame more.

Disclosure of Invention

In view of the above, the present invention is directed to a detection circuit and a liquid crystal display device, which can suppress the flicker of the gray-scale picture and the pure-color picture and save the frame.

In particular, the present invention provides a detection circuit for detecting a display panel,

the display panel comprises a plurality of pixel units which are arranged in an array mode, each pixel unit comprises three sub-pixels used for displaying different colors, and the detection circuit comprises a plurality of switch elements, at least two control signal lines and at least three data signal lines. The plurality of switch elements comprise control ends, first path ends and second path ends, the first path ends of the plurality of switch elements are connected with the same adjacent sub-pixel of each row along the column direction, the control ends of the plurality of switch elements are connected with a corresponding control signal line, and the second path ends of the plurality of switch elements are connected with a corresponding data signal line. The at least two control signal lines are used for transmitting corresponding control signals, each frame of the display image comprises time periods with the same number as the at least two control signal lines, and in any one time period, the corresponding control signal on at most only one control signal line is in a high level. The at least three data signal lines are used for transmitting corresponding image signals, and the corresponding image signals on each data signal line have corresponding polarities in each time period of each frame. If the corresponding control signal on one of the control signal lines is at a high level in a time period of each frame, controlling the corresponding switch elements to be switched on, and further controlling part of the sub-pixels to be connected with the corresponding data signal line to obtain corresponding polarity; accordingly, every time a frame passes, the corresponding control signals on the at least two control signal lines enable all the sub-pixels to be connected with the corresponding data signal line through the plurality of switching elements so as to obtain the corresponding polarity, and the polarities of the same sub-pixels of two adjacent pixel units in the same row are opposite.

Preferably, the first path ends of the plurality of switching elements are connected to two sub-pixels corresponding to the upper and lower of any two adjacent rows.

Preferably, the first pass ends of the plurality of switching elements are each connected to two diagonally corresponding sub-pixels of any two adjacent rows.

Preferably, the control signals on the at least two control signal lines cause the respective plurality of switching elements to be alternately turned on.

Preferably, in a corresponding time period of each frame, the relative potentials of the image signals on only a part of the data signal lines of the at least three data signal lines are higher to drive the corresponding sub-pixel to display, while the relative potentials of the image signals on the other part of the data signal lines of the at least three data signal lines are lower to drive the corresponding sub-pixel to display, so that a pure color picture can be detected.

Preferably, the detection circuit includes two control signal lines and three data signal lines; the two control signal lines are respectively a first control signal line and a second control signal line; the specific connection of six sub-pixels of two adjacent pixel units in each row is as follows: the first control signal line is connected with the control ends of the three corresponding switch elements, the first path ends of the three switch elements are correspondingly connected with three sub-pixels in the six sub-pixels one by one, and the second path ends of the three switch elements are correspondingly connected with the three data signal lines one by one. The second control signal line is connected with the control ends of the other three corresponding switch elements, the first path ends of the other three switch elements are correspondingly connected with the other three sub-pixels in the six sub-pixels one by one, and the second path ends of the other three switch elements are correspondingly connected with the three data signal lines one by one.

Preferably, the relative potential of the image signal on only one of the three data signal lines is higher to drive the corresponding sub-pixel to display, and the relative potentials of the image signals on the other two data signal lines of the three data signal lines are lower and are not enough to drive the corresponding sub-pixel to display, so that a pure color picture can be detected.

Preferably, the detection circuit includes three control signal lines and four data signal lines, and the specific connections of the six sub-pixels of two adjacent pixel units in each row are as follows: each control signal line is connected with the control ends of the corresponding four switching elements, the first path ends of the four switching elements are correspondingly connected with four sub-pixels in the six sub-pixels one by one, and the second path ends of the four switching elements are correspondingly connected with the four data signal lines one by one; and eight switching elements corresponding to any two control signal lines are connected with the six sub-pixels.

Preferably, in a corresponding time period of each frame, the relative potentials of the image signals on only a part of the four data signal lines are high to drive the corresponding sub-pixel to display, while the relative potentials of the image signals on the other part of the four data signal lines are low enough to drive the corresponding sub-pixel to display, so that a pure color picture can be detected.

The invention also provides a liquid crystal display device which comprises the detection circuit.

The detection circuit and the liquid crystal display device drive the display panel through the detection circuit, so that the polarities of the same sub-pixels of the adjacent pixel units on the same line are opposite, the flicker of a gray-scale picture and a pure-color picture can be inhibited, the abnormity of the pixels on the display panel can be accurately found during detection, and the frame is saved.

In order to make the aforementioned and other objects, features and advantages of the invention comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

Fig. 1 is a diagram of a first detection circuit and waveforms in the prior art.

Fig. 2 is a diagram of a second detection circuit and waveforms in the prior art.

FIG. 3 is a diagram of a detection circuit and waveforms according to an embodiment.

FIG. 4 is a diagram of a detection circuit and waveforms according to an embodiment.

FIG. 5 is a diagram of a detection circuit and waveforms according to an embodiment.

FIG. 6 is a diagram of a detection circuit and waveforms according to an embodiment.

FIG. 7 is a diagram of a detection circuit and waveforms according to an embodiment.

FIG. 8 is a diagram of a detection circuit and waveforms according to an embodiment.

FIG. 9 is a diagram of a detection circuit and waveforms according to an embodiment.

FIG. 10 is a diagram of a detection circuit and waveforms according to an embodiment.

Detailed Description

To further illustrate the technical means and effects of the present invention for achieving the intended purpose, the following detailed description is given to specific embodiments, methods, steps, structures, features and effects of a detection circuit and a liquid crystal display device according to the present invention with reference to the accompanying drawings and preferred embodiments.

The foregoing and other aspects, features and advantages of the invention will be apparent from the following more particular description of preferred embodiments, as illustrated in the accompanying drawings. While the invention has been described in connection with specific embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention.

First embodiment

The detection circuit 100 of the embodiment is used for detecting the display panel 200, the display panel 200 includes a plurality of pixel units arranged in an array, each pixel unit includes three sub-pixels for displaying different colors, namely a first sub-pixel (R1, R2, and the like), a second sub-pixel (G1, G2, and the like), and a third sub-pixel (B1, B2, and the like), and the detection circuit 100 includes a plurality of switching elements T, at least two control signal lines, and at least three data signal lines.

The plurality of switch elements T comprise control ends, first pass ends and second pass ends, the first pass ends of the plurality of switch elements T are connected with the same adjacent sub-pixel of each row along the column direction, the control ends of the plurality of switch elements T are connected with a corresponding control signal line of at least two control signal lines, and the second pass ends of the plurality of switch elements T are connected with a corresponding data signal line of at least three data signal lines.

The at least two control signal lines are used for transmitting corresponding control signals, each frame of the display image comprises time periods with the same number as the at least two control signal lines, and in any one time period, the control signal on at most only one control signal line is in a high level.

At least three data signal lines are used for transmitting corresponding image signals, and the image signal on each data signal line has corresponding polarity in each time period of each frame.

In a time period of each frame, if a corresponding control signal on one of the control signal lines is at a high level, controlling the corresponding switch elements T to be turned on, and further controlling the sub-pixels on the partial columns to be connected with a corresponding data signal line of the at least three data signal lines to obtain corresponding polarities; accordingly, every time a frame passes, the respective control signals on the at least two control signal lines cause the sub-pixels on all columns to be connected to a corresponding one of the at least three data signal lines through the plurality of switching elements T to obtain the respective polarities, and the polarities of the same sub-pixel of the adjacent two pixel units in the same row are made opposite.

In an embodiment, the first pass ends of the plurality of switching elements T are connected to two sub-pixels corresponding to two rows of any adjacent upper and lower rows, or the first pass ends of the plurality of switching elements T are connected to two sub-pixels corresponding to two rows of any adjacent lower row.

In one embodiment, the control signals on the at least two control signal lines alternately turn on the corresponding plurality of switching elements T.

In one embodiment, the first sub-pixel (R1, R2, etc.) may be a red sub-pixel, the second sub-pixel (G1, G2, etc.) may be a green sub-pixel, and the third sub-pixel (B1, B2, etc.) may be a blue sub-pixel.

In an embodiment, the plurality of switching elements T may be all N-type TFTs, or NMOS transistors or NPN-type transistors, and the like, so as to be turned on when receiving a corresponding high level; however, the present embodiment is not limited to this, and the present embodiment may also be all P-type TFTs, or PMOS transistors or PNP-type triodes, etc., so that the present embodiment can be turned on when receiving a corresponding low level. The following description will be given of an embodiment taking a TFT in which a plurality of switching elements T are all N-type TFTs as an example.

Specifically, each of the at least two control signal lines is connected to the control end of a corresponding one of the plurality of switching elements T, the first path end of the corresponding one of the plurality of switching elements T is connected to a part of the sub-pixels on the display panel 200, and the second path end of the corresponding one of the plurality of switching elements T is connected to a corresponding one of the at least three data signal lines. Meanwhile, each frame of the display image includes the same period as the number of at least two control signal lines, for example, if the number of control signal lines is two, each frame includes two periods. Moreover, the corresponding control signal on each control signal line and the corresponding image signal on each data signal line have corresponding signals in the corresponding time period of each frame, specifically, in any one of the time periods of one frame, the control signal on at most only one control signal line is at a high level, and the corresponding image signal on each data signal line has a corresponding polarity in the corresponding time period of each frame. In this embodiment, if the control signals on all the control signal lines are at low level in a certain time period of each frame, the time period may be removed without affecting the operation of the detection circuit 100, which also falls within the protection scope of the present invention.

Therefore, in the first time period of each frame, if the corresponding control signal on one of the control signal lines is at a high level, the plurality of switch elements T connected to the control signal line may be controlled to be turned on, so as to control a part of the sub-pixels to be connected to a corresponding one of the data signal lines to obtain the corresponding polarity of the corresponding image signal on the data signal line in the first time period; and so on the way other time segments of each frame work. Every time when all time periods included in one frame pass, corresponding control signals on at least two control signal lines enable all sub-pixels to be connected with a corresponding data signal line in at least three data signal lines through a plurality of switch elements T, corresponding polarities are obtained, and the polarities of the same sub-pixels of two adjacent pixel units in the same row are opposite, so that the flicker of a gray-scale picture can be inhibited, and the abnormality of the pixels on the display panel 200 can be accurately found during detection. Moreover, in this embodiment, the corresponding image signal on each data signal line has a corresponding polarity in each time period of each frame, so that more image signals with corresponding polarities can be transmitted to the corresponding sub-pixels in one frame through fewer data signal lines, the number of data signal lines required by the sub-pixels to display images is reduced, and corresponding frames can be saved.

In one embodiment, in a corresponding time period of each frame, the relative potentials of the image signals on only a part of the data signal lines of at least three data signal lines are higher to drive the corresponding sub-pixels to display, while the relative potentials of the image signals on the other part of the data signal lines of at least three data signal lines are lower not enough to drive the corresponding sub-pixels to display, so that a pure color picture can be detected. Specifically, a certain sub-pixel (e.g., the first sub-pixel (R1, R2, etc.)) in the upper portion of the display panel 200 may receive an image signal of positive polarity on one of the at least three data signal lines through the plurality of switching elements T for one corresponding period of one frame. And the sub-pixel (e.g., the first sub-pixel (R1, R2, etc.)) of another portion on the display panel 200 receives an image signal of a negative polarity on one of the at least three data signal lines through the plurality of switching elements T in a corresponding period of one frame. The sub-pixel can be driven to display when the relative potentials of the two image signals are high, and the relative potentials of the image signals received by the other sub-pixels are not high enough to drive to display, so that the display panel 200 only displays the color corresponding to the sub-pixel, and obtains a pure color picture, which can be used for detecting the pure color picture. In addition, the two image signals enable the polarities of the same sub-pixels of the adjacent pixel units in the same row to be opposite correspondingly, so that the flicker of a pure color picture can be inhibited, and the detection of the pure color picture is facilitated.

The detection circuit 100 of the embodiment drives the display panel 200 through the detection circuit 100, so that the polarities of the same sub-pixels of the adjacent pixel units on the same row are opposite, thereby suppressing the flicker of the gray-scale picture and the pure-color picture, more accurately finding the abnormality of the pixels on the display panel 200 during detection, and more saving the frame.

Second embodiment

In the drawings in this specification, R0, R1, R2, R3, R4, and the like denote respective first subpixels, G0, G1, G2, G3, G4, and the like denote respective second subpixels, and B0, B1, B2, B3, B4, and the like denote respective third subpixels. Referring to fig. 3, fig. 3 is a waveform diagram of a detection circuit 100 according to an embodiment. In the detection circuit shown in fig. 3, the first path terminals of the plurality of switching elements (T) are connected to two sub-pixels corresponding to the upper and lower sides of any two adjacent rows. The six sub-pixels of two adjacent pixel units in each row are the first sub-pixel R1, the second sub-pixel G1, the third sub-pixel B1, the fourth sub-pixel R2, the fifth sub-pixel G2 and the sixth sub-pixel B2, which are taken as an example for explanation.

The detection circuit 100 of the present embodiment is basically the same in structure as the detection circuit 100 of the first embodiment, and differs therefrom only in that: the detection circuit 100 includes two control signal lines and three data signal lines; the two control signal lines are a first control signal line ADD1 and a second control signal line ADD2 respectively; the specific connection of six sub-pixels of two adjacent pixel units in each row is as follows: the first control signal lines ADD1 are connected with the control ends of the corresponding three switch elements T, the first path ends of the three switch elements T are correspondingly connected with three sub-pixels in the six sub-pixels one by one, and the second path ends of the three switch elements T are correspondingly connected with the three data signal lines one by one; the second control signal lines ADD2 are connected to the control ends of the other three corresponding switching elements T, the first path ends of the other three switching elements T are connected to the other three sub-pixels of the six sub-pixels one by one, and the second path ends of the other three switching elements T are connected to the three data signal lines one by one. In the present embodiment, the first path end of each switching element T is connected to two sub-pixels corresponding to the upper and lower portions of any two adjacent rows, as shown in fig. 3.

Specifically, as shown in fig. 3, each pixel unit includes three sub-pixels, and each two adjacent pixel units include six sub-pixels corresponding to each other. The specific connection of six sub-pixels of two adjacent pixel units in each row is as follows: the first control signal lines ADD1 are connected to control terminals of three corresponding switching elements T, first path terminals of the three switching elements T are connected to one-to-one correspondence with three of the sub-pixels (for example, the first three sub-pixels among six sub-pixels), and second path terminals of the three switching elements T are connected to one-to-one correspondence with three data signal lines. The second control signal lines ADD2 are connected to control terminals of corresponding other three switching elements T, the first path terminals of the other three switching elements T are connected to the corresponding one-to-one correspondence of the other three sub-pixels (for example, the last three sub-pixels among the six sub-pixels), and the second path terminals of the other three switching elements T are connected to the corresponding one-to-one correspondence of the three data signal lines. Accordingly, the corresponding control signals on the two control signal lines can control whether the connected switching elements T are turned on, and further control whether all the sub-pixels of the display panel 200 are connected to the corresponding data signal lines to obtain the image signals of the corresponding polarities.

In this embodiment, one frame includes two time segments, for example, as shown in fig. 3, the time of one frame is divided into two time segments, i.e., a first time segment and a second time segment. And the two control signal lines are a first control signal line ADD1 and a second control signal line ADD2, respectively; the three data signal lines are a first data signal line D1, a second data signal line D2, and a third data signal line D3, respectively. In the first period, the control signal corresponding to the first data signal line D1 is at a high level and the control signal corresponding to the second data signal line D2 is at a low level; in the second period, the control signal corresponding to the first data signal line D1 is at a low level and the control signal corresponding to the second data signal line D2 is at a high level. Thus, the control signals on the two control signal lines cause the corresponding switching elements T to be alternately turned on, specifically: in the first period, the control signal corresponding to the first control signal line ADD1 is at the high level to turn on the corresponding three switching elements T, and in the second period, the control signal corresponding to the second control signal line ADD2 is at the high level to turn on the corresponding other three switching elements T, and these six switching elements T are alternately turned on.

Meanwhile, in each period of each frame, the image signal on the first data signal line D1, the image signal on the second data signal line D2, and the image signal on the third data signal line D3 all have the corresponding polarities. For example, as shown in fig. 3, the image signal on the first data signal line D1 may have a positive polarity during the first period of the first frame and a negative polarity during the second period of the first frame, and the image signal on the first data signal line D1 may have a negative polarity during the first period of the second frame and a positive polarity during the second period of the second frame when the polarity inversion is performed. The image signal on the second data signal line D2 may be a corresponding negative polarity during the first period of the first frame and a corresponding positive polarity during the second period of the first frame, and when the polarity inversion is performed, the image signal on the second data line D2 may be a corresponding positive polarity during the first period of the second frame and a corresponding negative polarity during the second period of the second frame. The image signal on the third data signal line D3 may be a corresponding positive polarity during the first period of the first frame and a corresponding negative polarity during the second period of the first frame, and when the polarity inversion is performed, the image signal on the third data signal line D3 may be a corresponding negative polarity during the first period of the second frame and a corresponding positive polarity during the second period of the second frame.

The control signal on the first control signal line ADD1 is high during the first period of the first frame and turns on the corresponding three switching elements T so that three of the six sub-pixels of any two adjacent groups of pixel units are respectively connected to the corresponding three data signal lines one-to-one and acquire the corresponding polarities. For example, as shown in fig. 3, in the first period of the first frame, the control signal on the first control signal line ADD1 is at high level, and the corresponding three switching elements T are turned on, so that the first sub-pixel R1 of the six sub-pixels of any two adjacent groups of pixel units is connected to the first data signal line D1 and obtains an image signal of corresponding positive polarity, the second sub-pixel G1 is connected to the second data signal line D2 and obtains an image signal of corresponding negative polarity, and the third sub-pixel B1 is connected to the third data signal line D3 and obtains an image signal of corresponding positive polarity; so that some sub-pixels obtain corresponding polarities, specifically: the sub-pixels of the display panel 200 are arranged in an array, and three sub-pixels in every six rows of sub-pixels obtain corresponding polarities. In the second period of the first frame, the control signal on the second control signal line ADD2 is at high level, and the corresponding other three switching elements T are turned on so that the other three sub-pixels of the six sub-pixels of any two adjacent groups of pixel units are respectively connected to the corresponding three data signal lines one by one and obtain the corresponding polarities. For example, as shown in fig. 3, in the second period of the first frame, the control signal on the second control signal line ADD2 is at high level, and the corresponding three other switching elements T are turned on, so that the fourth sub-pixel R2 of the six sub-pixels of any two adjacent groups of pixel units is connected to the first data signal line D1 and obtains the image signal of the corresponding negative polarity, the fifth sub-pixel G2 is connected to the second data signal line D2 and obtains the image signal of the corresponding positive polarity, and the sixth sub-pixel B2 is connected to the third data signal line D3 and obtains the image signal of the corresponding negative polarity; so that some sub-pixels obtain corresponding polarities, specifically: the sub-pixels of the display panel 200 are arranged in an array, and the other three rows of the sub-pixels in every six rows of the sub-pixels obtain corresponding polarities. Therefore, after the first time period and the second time period of the first frame, all the sub-pixels obtain corresponding polarities, and the polarities of the same sub-pixel of two adjacent pixel units in the same row are opposite, and the specific distribution of the polarities is as shown in fig. 3, so that the flicker of the gray scale picture can be suppressed, and the abnormality of the pixels on the display panel 200 can be more accurately found during detection. Similarly, the working mode of the second frame can be known, the polarity of the second frame is inverted, and after the first time period and the second time period of the second frame, all the sub-pixels obtain corresponding polarities, and the polarities of the same sub-pixels of two adjacent pixel units in the same row are opposite, so that the flicker of the gray-scale picture can be suppressed, and the abnormality of the pixels on the display panel 200 can be more accurately found during detection.

In one embodiment, the relative potential of the image signal on only one of the three data signal lines is higher to drive the corresponding sub-pixel to display, and the relative potentials of the image signals on the other two data signal lines of the three data signal lines are lower than the relative potentials of the image signals on the other two data signal lines to drive the corresponding sub-pixel to display, so that a pure color picture can be detected. Fig. 4 is a waveform diagram and a detection circuit 100 according to an embodiment, as shown in fig. 4, in the first period of each frame, the first sub-pixel (R1, R3, etc.) in the upper portion of the display panel 200 receives the image signal with positive polarity on the first data signal line D1 through the plurality of switching elements T. And in the second period of each frame, the first sub-pixel (R2, R4, etc.) of another portion on the display panel 200 receives the image signal of the negative polarity on the first data signal line D1 through the plurality of switching elements T. The relative potentials of the two image signals are high, so that the first sub-pixels (R1, R2, and the like) can be driven to display, and the relative potentials of the image signals received by the other sub-pixels (the second sub-pixels (G1, G2, and the like) and the third sub-pixels (B1, B2, and the like)) are low, so that the display panel 200 is not enough to drive to display, and only the corresponding colors of the first sub-pixels (R1, R2, and the like) are displayed, so that a pure color picture is obtained, and the pure color picture can be detected. In addition, the two image signals have opposite polarities of the adjacent first sub-pixels (R1, R2, and the like) in the same row, so that the flicker of the pure color picture can be suppressed, and the detection of the pure color picture can be facilitated.

Third embodiment

Referring to fig. 5, fig. 5 is a waveform diagram of the detection circuit 100 according to an embodiment. The detection circuit 100 of the present embodiment has substantially the same structure as the detection circuit 100 of the second embodiment, and differs therefrom only in that: the first path ends of the plurality of switching elements T are connected to two sub-pixels diagonally corresponding to two arbitrary adjacent rows.

Specifically, in the first period of the first frame, the control signal on the first control signal line ADD1 is at a high level, and the corresponding three switching elements T are turned on, so that three of the six sub-pixels of any two adjacent groups of pixel units are respectively connected to the three data signal lines one by one and acquire the corresponding polarities. For example, as shown in fig. 5, in the first period of the first frame, the control signal on the first control signal line ADD1 is at high level, and the corresponding three switching elements T are turned on, so that the first sub-pixel R1 of the six sub-pixels of any two adjacent groups of pixel units is connected to the first data signal line D1 and obtains an image signal of corresponding positive polarity, the second sub-pixel G1 is connected to the second data signal line D2 and obtains an image signal of corresponding negative polarity, and the third sub-pixel B1 is connected to the third data signal line D3 and obtains an image signal of corresponding positive polarity; so that the partial sub-pixels obtain the corresponding polarities. In the second period of the first frame, the control signal on the second control signal line ADD2 is at high level, and the corresponding other three switching elements T are turned on so that the other three sub-pixels of the six sub-pixels of any two adjacent groups of pixel units are respectively connected to the corresponding three data signal lines one by one and obtain the corresponding polarities. For example, as shown in fig. 5, in the second period of the first frame, the control signal on the second control signal line ADD2 is at high level, and the corresponding three other switching elements T are turned on, so that the fourth sub-pixel R2 of the six sub-pixels of any two adjacent groups of pixel units is connected to the first data signal line D1 and obtains an image signal of the corresponding negative polarity, the fifth sub-pixel G2 is connected to the second data signal line D2 and obtains an image signal of the corresponding positive polarity, and the sixth sub-pixel B2 is connected to the third data signal line D3 and obtains an image signal of the corresponding negative polarity; so that the partial sub-pixels obtain the corresponding polarities. Therefore, after the first time period and the second time period of the first frame, all the sub-pixels obtain corresponding polarities, and the polarities of the same sub-pixel of two adjacent pixel units in the same row are opposite, and because the first pass end of the switch element T is connected to two diagonally corresponding sub-pixels in any two adjacent rows, the polarities of two adjacent sub-pixels in the same column are also opposite, so that the polarities of any sub-pixel and the adjacent sub-pixels are opposite, and the specific distribution of the polarities is as shown in fig. 5, so that the flicker of the gray scale picture can be suppressed, and the abnormality of the pixels on the display panel 200 can be more accurately found during detection. Similarly, the working mode of the second frame can be known, the polarity of the second frame is inverted, and after the first time period and the second time period of the second frame, all the sub-pixels have corresponding polarities, and the polarities of the same sub-pixel of two adjacent pixel units in the same row are opposite, and because the first pass end of the switching element T is connected to two diagonally corresponding sub-pixels in any two adjacent rows, the polarities of two adjacent sub-pixels in the same column are also opposite, so that the polarities of any sub-pixel and the adjacent sub-pixel are opposite, thereby suppressing the flicker of the gray scale image, and more accurately finding the abnormality of the pixels on the display panel 200 during the detection.

In one embodiment, as shown in fig. 6, fig. 6 is a waveform diagram of the detection circuit 100 according to an embodiment, in which the relative potential of the image signal on only one of the three data signal lines is higher to drive the corresponding sub-pixel to display, and the relative potentials of the image signals on the other two data signal lines are not lower enough to drive the corresponding sub-pixel to display, so that a pure color image can be detected. The present embodiment may receive the image signal of the positive polarity on the first data signal line D1 through the plurality of switching elements T to a part of the first subpixels (R1, R3, etc.) on the display panel 200 in the first period of each frame. And in the second period of each frame, the first sub-pixel (R2, R4, etc.) of another portion on the display panel 200 receives the image signal of the negative polarity on the first data signal line D1 through the plurality of switching elements T. The relative potentials of the two image signals are high, so that the first sub-pixels (R1, R2, and the like) can be driven to display, and the relative potentials of the image signals received by the other sub-pixels (the second sub-pixels (G1, G2, and the like) and the third sub-pixels (B1, B2, and the like)) are low, so that the display panel 200 is not enough to drive to display, and only the corresponding colors of the first sub-pixels (R1, R2, and the like) are displayed, so that a pure color picture is obtained, and the pure color picture can be detected. In addition, the two image signals have opposite polarities of the adjacent first sub-pixels (R1, R2, and the like) in the same row, so that the flicker of the pure color picture can be suppressed, and the detection of the pure color picture can be facilitated.

The detection circuit 100 of the embodiment drives the display panel 200 through the detection circuit 100, so that the polarities of any sub-pixel and the adjacent sub-pixel are opposite, thereby suppressing the flicker of the gray-scale picture and the pure-color picture, more accurately finding the abnormality of the pixels on the display panel 200 during detection, and more saving the frame.

Fourth embodiment

Referring to fig. 7, fig. 7 is a waveform diagram of the detection circuit 100 according to an embodiment. The detection circuit 100 of the present embodiment is basically the same in structure as the detection circuit 100 of the first embodiment, and differs therefrom only in that: the detection circuit 100 includes three control signal lines and four data signal lines, the four data signal lines are a first data signal line D1, a second data signal line D2, a third data signal line D3 and a fourth data signal line D4, respectively, and the three control signal lines are a first control signal line ADD1, a second control signal line ADD2 and a third control signal line ADD3, respectively; the specific connection of six sub-pixels of two adjacent pixel units in each row is as follows: each control signal line is connected with the control ends of the corresponding four switching elements T, the first path ends of the four switching elements T are correspondingly connected with four sub-pixels in the six sub-pixels one by one, and the second path ends of the four switching elements T are correspondingly connected with the four data signal lines one by one; eight switching elements T corresponding to any two control signal lines are connected with six sub-pixels.

In one embodiment, as shown in fig. 7, of the six sub-pixels of the adjacent two pixel units in each row, the first sub-pixel R1 is connected to the first path terminals of the corresponding two switching elements T, the control terminal and the second path terminal of one of the switching elements T are connected to the first control signal line ADD1 and the first data signal line D1, respectively, and the control terminal and the second path terminal of the other switching element T are connected to the second control signal line ADD2 and the second data signal line D2, respectively. The second sub-pixel G1 is connected to the first path terminals of two corresponding switching elements T, a control terminal and a second path terminal of one of the switching elements T are connected to the second control signal line ADD2 and the third data signal line D3, respectively, and a control terminal and a second path terminal of the other switching element T are connected to the third control signal line ADD3 and the second data signal line D2, respectively. The third sub-pixel B1 is connected to the first path terminals of two corresponding switching elements T, a control terminal and a second path terminal of one of the switching elements T are connected to the first control signal line ADD1 and the second data signal line D2, respectively, and a control terminal and a second path terminal of the other switching element T are connected to the third control signal line ADD3 and the fourth data signal line D4, respectively. The fourth sub-pixel R2 is connected to the first path terminals of two corresponding switching elements T, a control terminal and a second path terminal of one of the switching elements T are connected to the second control signal line ADD2 and the fourth data signal line D4, respectively, and a control terminal and a second path terminal of the other switching element T are connected to the third control signal line ADD3 and the third data signal line D3, respectively. The fifth sub-pixel G2 is connected to the first path terminals of two corresponding switching elements T, a control terminal and a second path terminal of one of the switching elements T are connected to the first control signal line ADD1 and the fourth data signal line D4, respectively, and a control terminal and a second path terminal of the other switching element T are connected to the third control signal line ADD3 and the first data signal line D1, respectively. The sixth sub-pixel B2 is connected to the first path terminals of two corresponding switching elements T, a control terminal and a second path terminal of one of the switching elements T are connected to the first control signal line ADD1 and the third data signal line D3, respectively, and a control terminal and a second path terminal of the other switching element T are connected to the second control signal line ADD2 and the first data signal line D1, respectively.

Specifically, as shown in fig. 7, each pixel unit includes three sub-pixels, and each two adjacent pixel units include six sub-pixels corresponding to each other. The specific connection of six sub-pixels of two adjacent pixel units in each row is as follows: the first control signal line ADD1 is connected to control terminals of four corresponding switching elements T, first path terminals of the four switching elements T are connected to one-to-one correspondence with four sub-pixels (for example, a first sub-pixel R1, a third sub-pixel B1, a fifth sub-pixel G2, and a sixth sub-pixel B2 among six sub-pixels), and second path terminals of the four switching elements T are connected to one-to-one correspondence with four data signal lines. The connection of the other two control signal lines and the associated switching elements T, sub-pixels, and four data signal lines may refer to the specific connection of the first control signal line ADD1, which is not described in detail herein, but eight switching elements T corresponding to any two control signal lines of the present embodiment are connected to six sub-pixels, for example, four switching elements T corresponding to the first control signal line ADD1 may be connected to the first sub-pixel R1, the third sub-pixel B1, the fifth sub-pixel G2, and the sixth sub-pixel B2, four switching elements T corresponding to the second control signal line ADD2 may be connected to the first sub-pixel R1, the second sub-pixel G1, the fourth sub-pixel R2, and the sixth sub-pixel B2, four switching elements T corresponding to the third control signal line ADD3 may be connected to the second sub-pixel G1, the third sub-pixel B1, the fourth sub-pixel R2, and the fifth sub-pixel G2, the eight switching elements T corresponding to any two control signal lines are connected to six sub-pixels.

The detection circuit 100 of this embodiment does not require corresponding control signals on three control signal lines to turn on the corresponding switching elements T so that all the sub-pixels are connected to the corresponding data signal lines through the corresponding switching elements T, and only requires corresponding control signals on two control signal lines to turn on the corresponding switching elements T so that all the sub-pixels are connected to the corresponding data signal lines through the corresponding switching elements T. Thus, two control signal lines among the three control signal lines may be selectively selected to transmit corresponding control signals so that all the sub-pixels are connected to the corresponding data signal lines through the corresponding switching elements T.

In this embodiment, the plurality of periods of each frame may include a first period, a second period, and a third period. In one embodiment, as shown in fig. 7, the control signal on the first control signal line ADD1 is at a high level for a first period of time, the control signal on the second control signal line ADD2 is at a high level for only a second period of time, and the control signal on the third control signal line ADD3 is always at a low level. Thus, the control signals on the three control signal lines alternately turn on the corresponding plurality of switching elements T in the first period and the second period, specifically: in the first period, the control signal corresponding to the first control signal line ADD1 is at the high level to turn on the corresponding four switching elements T, and in the second period, the control signal corresponding to the second control signal line ADD2 is at the high level to turn on the corresponding four switching elements T, and these eight switching elements T are alternately turned on.

Meanwhile, in each period of each frame, the image signal on the first data signal line D1, the image signal on the second data signal line D2, the image signal on the third data signal line D3, and the image signal on the fourth data signal line D4 all have the corresponding polarities. For example, as shown in fig. 7, in the third time period, since the control signals on all the control signal lines are at a low level, and any corresponding switch element T is not controlled to be turned on, any corresponding sub-pixel is not connected to the corresponding data signal line through the switch element T to obtain the corresponding polarity, so that the image signal in the third time period can be ignored. The image signal on the first data signal line D1 to the image signal on the fourth data signal line D4 are each a periodic signal of one cycle every two frames, which may be a first frame and a second frame; the image signal on the first data signal line D1 may be positive and negative in the first and second periods of the first frame and negative and positive in the first and third periods of the second frame, respectively; the image signal on the second data signal line D2 may be positive in the first and second periods of the first frame and negative in the first and second periods of the second frame; the image signal on the third data signal line D3 may be negative in the first and second periods of the first frame and positive in the first and second periods of the second frame; the image signal on the fourth data signal line D4 may be positive and negative in the first and third periods of the first frame, respectively, and may be negative and positive in the first and third periods of the second frame, respectively.

The control signal on the first control signal line ADD1 is high during the first period of the first frame and turns on the corresponding four switching elements T so that four of the six sub-pixels of any two adjacent groups of pixel units are respectively connected to the four data signal lines one by one and acquire the corresponding polarities. For example, as shown in fig. 7, in the first period of the first frame, the control signal on the first control signal line ADD1 is at high level, and the corresponding four switching elements T are turned on, so that the first sub-pixel R1 of the six sub-pixels of any two adjacent groups of pixel units is connected to the first data signal line D1 and obtains an image signal of corresponding positive polarity, the third sub-pixel B1 is connected to the second data signal line D2 and obtains an image signal of corresponding positive polarity, the fifth sub-pixel G2 is connected to the fourth data signal line D4 and obtains an image signal of corresponding positive polarity, and the sixth sub-pixel B2 is connected to the third data signal line D3 and obtains an image signal of corresponding negative polarity; so that some sub-pixels obtain corresponding polarities, specifically: the sub-pixels of the display panel 200 are arranged in an array, and four sub-pixels in each six sub-pixels obtain corresponding polarities. In the second period of the first frame, the control signal on the second control signal line ADD2 is at high level, and the corresponding other four switching elements T are turned on so that four sub-pixels of the six sub-pixels of any two adjacent groups of pixel units are respectively connected to the corresponding three data signal lines one by one and obtain corresponding polarities. For example, as shown in fig. 7, in the second period of the first frame, the control signal on the second control signal line ADD2 is at high level, and the corresponding four switching elements T are turned on, so that the first sub-pixel R1 of the six sub-pixels of any two adjacent groups of pixel units is connected to the second data signal line D2 and obtains the image signal of the corresponding positive polarity, the second sub-pixel G1 is connected to the third data signal line D3 and obtains the image signal of the corresponding negative polarity, the fourth sub-pixel R2 is connected to the fourth data signal line D4 and obtains the image signal of the corresponding negative polarity, and the sixth sub-pixel B2 is connected to the first data signal line D1 and obtains the image signal of the corresponding negative polarity; so that some sub-pixels obtain corresponding polarities, specifically: the sub-pixels of the display panel 200 are arranged in an array, and four sub-pixels in each six sub-pixels obtain corresponding polarities. Therefore, after the first time period and the second time period of the first frame, all the sub-pixels obtain corresponding polarities, and the polarities of the same sub-pixel of two adjacent pixel units in the same row are opposite, and the specific distribution of the polarities is as shown in fig. 7, so that the flicker of the gray scale picture can be suppressed, and the abnormality of the pixels on the display panel 200 can be more accurately found during detection. Similarly, the working mode of the second frame can be known, the polarity of the second frame is inverted, and after the first time period and the second time period of the second frame, all the sub-pixels obtain corresponding polarities, and the polarities of the same sub-pixels of two adjacent pixel units in the same row are opposite, so that the flicker of the gray-scale picture can be suppressed, and the abnormality of the pixels on the display panel 200 can be more accurately found during detection.

In one embodiment, as shown in fig. 8, fig. 8 is a waveform diagram and a detection circuit 100 according to an embodiment, and the embodiment of fig. 8 is different from the embodiment of fig. 7 in that: the control signals on the three control signal lines are different from the image signals on the four data signal lines. The method specifically comprises the following steps: the plurality of periods of each frame include a first period in which the control signal on the first control signal line ADD1 is at a high level, a second period in which the control signal on the second control signal line ADD2 is always at a low level, and a third period in which the control signal on the third control signal line ADD3 is at a high level. The image signal on the first data signal line D1 to the image signal on the fourth data signal line D4 are each a periodic signal of one cycle every two frames, which may be a first frame and a second frame; the image signal on the first data signal line D1 may be positive in the first and third periods of the first frame and negative in the first and third periods of the second frame; the image signal on the second data signal line D2 may be positive and negative in the first period and the third period of the first frame, respectively, and may be negative and positive in the first period and the third period of the second frame, respectively; the image signal on the third data signal line D3 may be negative in the first and third periods of the first frame and positive in the first and third periods of the second frame; the image signal on the fourth data signal line D4 may be positive in the first and third periods of the first frame and negative in the first and third periods of the second frame.

The specific working process is substantially the same as that of the embodiment of fig. 7, and will not be described here, after each frame, all the sub-pixels have the corresponding polarities, and the polarities of the same sub-pixels of two adjacent pixel units in the same row are made opposite, so that the flicker of the gray scale image can be suppressed, and the abnormality of the pixels on the display panel 200 can be found more accurately during the detection. In addition, in one embodiment, in a corresponding time period of each frame, the relative potentials of the image signals on only a part of the four data signal lines are higher to drive the corresponding sub-pixel to display, while the relative potentials of the image signals on the other part of the four data signal lines are lower to drive the corresponding sub-pixel to display, so that a pure color picture can be detected. For example, as shown in fig. 8, in the first period of the first frame, the relative potential of the image signal with positive polarity on only the first data signal line D1 of the four data signal lines is higher to drive the corresponding first sub-pixels (R1, R3, etc.) to display; in the third period of the first frame, the relative potential of only the image signal of negative polarity on the third data signal line D3 of the four data signal lines is higher to drive the corresponding first sub-pixel (R2, R4, etc.) to display, the relative potential of the two image signals received by the first sub-pixel (R1, R2, etc.) is higher to drive the display, and the relative potential of the image signals received by the other sub-pixels (the second sub-pixel (G1, G2, etc.) and the third sub-pixel (B1, B2, etc.)) is lower to drive the display insufficiently, so that the display panel 200 displays only the color corresponding to the first sub-pixel (R1, R2, etc.), resulting in a pure color picture, and detection of the pure color picture can be performed. In addition, the two image signals have opposite polarities of the adjacent first sub-pixels (R1, R2, and the like) in the same row, so that the flicker of the pure color picture can be suppressed, and the detection of the pure color picture can be facilitated.

Fifth embodiment

Referring to fig. 9, fig. 9 is a waveform diagram of a detection circuit 100 according to an embodiment. The detection circuit 100 of the present embodiment has substantially the same structure as the detection circuit 100 of the embodiment of fig. 7, and the difference is only that: the first path ends of the plurality of switching elements T are connected to two sub-pixels diagonally corresponding to two arbitrary adjacent rows.

Specifically, in the first period of the first frame, the control signal on the first control signal line ADD1 is at a high level, and the corresponding four switching elements T are turned on, so that four of the six sub-pixels of any two adjacent groups of pixel units are respectively connected to the four data signal lines one by one and acquire corresponding polarities. For example, as shown in fig. 9, in the first period of the first frame, the control signal on the first control signal line ADD1 is at high level, and the corresponding four switching elements T are turned on, so that the first sub-pixel R1 of the six sub-pixels of any two adjacent groups of pixel units is connected to the first data signal line D1 and obtains an image signal of corresponding positive polarity, the third sub-pixel B1 is connected to the second data signal line D2 and obtains an image signal of corresponding positive polarity, the fifth sub-pixel G2 is connected to the fourth data signal line D4 and obtains an image signal of corresponding positive polarity, and the sixth sub-pixel B2 is connected to the third data signal line D3 and obtains an image signal of corresponding negative polarity; so that the partial sub-pixels obtain the corresponding polarities. In the second period of the first frame, the control signal on the second control signal line ADD2 is at high level, and the corresponding other four switching elements T are turned on so that four sub-pixels of the six sub-pixels of any two adjacent groups of pixel units are respectively connected to the corresponding three data signal lines one by one and obtain corresponding polarities. For example, as shown in fig. 9, in the second period of the first frame, the control signal on the second control signal line ADD2 is at high level, and the corresponding four switching elements T are turned on, so that the first sub-pixel R1 of the six sub-pixels of any two adjacent groups of pixel units is connected to the second data signal line D2 and obtains the image signal of the corresponding positive polarity, the second sub-pixel G1 is connected to the third data signal line D3 and obtains the image signal of the corresponding negative polarity, the fourth sub-pixel R2 is connected to the fourth data signal line D4 and obtains the image signal of the corresponding negative polarity, and the sixth sub-pixel B2 is connected to the first data signal line D1 and obtains the image signal of the corresponding negative polarity; so that the partial sub-pixels obtain the corresponding polarities. Therefore, after the first time period and the second time period of the first frame, all the sub-pixels obtain corresponding polarities, and the polarities of the same sub-pixel of two adjacent pixel units in the same row are opposite, and because the first pass end of the switch element T is connected to two diagonally corresponding sub-pixels in any two adjacent rows, the polarities of two adjacent sub-pixels in the same column are also opposite, so that the polarities of any sub-pixel and the adjacent sub-pixels are opposite, and the specific distribution of the polarities is as shown in fig. 9, so that the flicker of the gray scale picture can be suppressed, and the abnormality of the pixels on the display panel 200 can be more accurately found during detection. Similarly, the working mode of the second frame can be known, the polarity of the second frame is inverted, and after the first time period and the second time period of the second frame, all the sub-pixels have corresponding polarities, and the polarities of the same sub-pixel of two adjacent pixel units in the same row are opposite, and because the first pass end of the switching element T is connected to two diagonally corresponding sub-pixels in any two adjacent rows, the polarities of two adjacent sub-pixels in the same column are also opposite, so that the polarities of any sub-pixel and the adjacent sub-pixel are opposite, thereby suppressing the flicker of the gray scale image, and more accurately finding the abnormality of the pixels on the display panel 200 during the detection.

In one embodiment, as shown in fig. 10, fig. 10 is a waveform diagram and a detection circuit 100 according to an embodiment, and the embodiment of fig. 10 is different from the embodiment of fig. 9 in that: the control signals on the three control signal lines are different from the image signals on the four data signal lines, and the method specifically comprises the following steps: the plurality of periods of each frame include a first period in which the control signal on the first control signal line ADD1 is at a high level, a second period in which the control signal on the second control signal line ADD2 is always at a low level, and a third period in which the control signal on the third control signal line ADD3 is at a high level; the image signal on the first data signal line D1 to the image signal on the fourth data signal line D4 are each a periodic signal of one cycle every two frames, which may be a first frame and a second frame; the image signal on the first data signal line D1 may be positive in the first and third periods of the first frame and negative in the first and third periods of the second frame; the image signal on the second data signal line D2 may be positive and negative in the first period and the third period of the first frame, respectively, and may be negative and positive in the first period and the third period of the second frame, respectively; the image signal on the third data signal line D3 may be negative in the first and third periods of the first frame and positive in the first and third periods of the second frame; the image signal on the fourth data signal line D4 may be positive in the first and third periods of the first frame and negative in the first and third periods of the second frame.

The specific working process is substantially the same as that of the embodiment of fig. 9, and will not be described here, after each frame, all the sub-pixels have the corresponding polarities, and the polarities of the same sub-pixels of two adjacent pixel units in the same row are made opposite, so that the flicker of the gray scale image can be suppressed, and the abnormality of the pixels on the display panel 200 can be found more accurately during the detection. In addition, in one embodiment, in a corresponding time period of each frame, the relative potentials of the image signals on only a part of the four data signal lines are higher to drive the corresponding sub-pixel to display, while the relative potentials of the image signals on the other part of the four data signal lines are lower to drive the corresponding sub-pixel to display, so that a pure color picture can be detected. For example, as shown in fig. 10, in the first period of the first frame, the relative potential of the image signal with positive polarity on only the first data signal line D1 of the four data signal lines is higher to drive the corresponding first sub-pixels (R1, R3, etc.) to display; in the third period of the first frame, the relative potential of only the image signal of negative polarity on the third data signal line D3 of the four data signal lines is higher to drive the corresponding first sub-pixel (R2, R4, etc.) to display, the relative potential of the two image signals received by the first sub-pixel (R1, R2, etc.) is higher to drive the display, and the relative potential of the image signals received by the other sub-pixels (the second sub-pixel (G1, G2, etc.) and the third sub-pixel (B1, B2, etc.)) is lower to drive the display insufficiently, so that the display panel 200 displays only the color corresponding to the first sub-pixel (R1, R2, etc.), resulting in a pure color picture, and detection of the pure color picture can be performed. In addition, the two image signals have opposite polarities of the adjacent first sub-pixels (R1, R2, and the like) in the same row, so that the flicker of the pure color picture can be suppressed, and the detection of the pure color picture can be facilitated.

Sixth embodiment

The present embodiment further provides a liquid crystal display device, which includes the detection circuit 100 according to one of the above embodiments.

In the liquid crystal display device of the embodiment, the detection circuit 100 drives the display panel 200 to make the polarities of the same sub-pixels of two adjacent pixel units in the same row opposite, so that the flicker of a gray-scale picture and a pure-color picture can be suppressed, the abnormality of the pixels on the display panel 200 can be more accurately found during detection, and the frame can be more saved.

Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A detection circuit (100) for detecting a display panel (200), the display panel (200) comprising a plurality of pixel units arranged in an array, each pixel unit comprising three sub-pixels for displaying different colors, characterized in that the detection circuit (100) comprises a plurality of switching elements (T), at least two control signal lines and at least three data signal lines;

the plurality of switch elements (T) comprise control ends, first path ends and second path ends, the first path ends of the plurality of switch elements (T) are connected with the same sub-pixel adjacent to each row along the column direction, the control ends of the plurality of switch elements (T) are connected with a corresponding control signal line, and the second path ends of the plurality of switch elements (T) are connected with a corresponding data signal line;

the at least two control signal lines are used for transmitting corresponding control signals, each frame of the display image comprises time periods with the same number as the at least two control signal lines, and in any one time period, the corresponding control signal on at most only one control signal line is in a high level;

the at least three data signal lines are used for transmitting corresponding image signals, and the corresponding image signals on each data signal line have corresponding polarities in each time period of each frame;

if the corresponding control signal on one control signal line is in a high level in a time period of each frame, controlling the corresponding switch elements (T) to be conducted, and further controlling part of the sub-pixels to be connected with the corresponding data signal line to obtain corresponding polarity; accordingly, every time one frame passes, the respective control signals on the at least two control signal lines connect all the sub-pixels to a corresponding one of the data signal lines through the plurality of switching elements (T) to obtain respective polarities, and the polarities of the same sub-pixels of adjacent two pixel units in the same row are made opposite.

2. A detection circuit (100) as claimed in claim 1, wherein the first path terminals of the plurality of switching elements (T) are each connected to two sub-pixels corresponding to the upper and lower of any two adjacent rows.

3. A detection circuit (100) as claimed in claim 1, characterized in that the first path terminals of the switching elements (T) are each connected to two diagonally corresponding sub-pixels of any two adjacent rows.

4. A detection circuit (100) as claimed in claim 1, characterized in that the control signals on the at least two control signal lines cause the respective plurality of switching elements (T) to be alternately switched on.

5. A detection circuit (100) as claimed in claim 1, wherein, during a corresponding time period of each frame, the relative potentials of the image signals on only a part of the data signal lines of the at least three data signal lines are higher to drive the corresponding sub-pixel to display, and the relative potentials of the image signals on the other part of the data signal lines of the at least three data signal lines are lower to be insufficient to drive the corresponding sub-pixel to display, so as to detect a pure color picture.

6. A detection circuit (100) as claimed in claim 1, characterized in that the detection circuit (100) comprises two control signal lines and three data signal lines; the two control signal lines are a first control signal line (ADD1) and a second control signal line (ADD2), respectively; the specific connection of six sub-pixels of two adjacent pixel units in each row is as follows:

the first control signal lines (ADD1) are connected with the control ends of three corresponding switch elements (T), the first path ends of the three switch elements (T) are correspondingly connected with three sub-pixels in the six sub-pixels one by one, and the second path ends of the three switch elements (T) are correspondingly connected with the three data signal lines one by one;

the second control signal lines (ADD2) are connected to control terminals of corresponding other three switching elements (T), first path terminals of the other three switching elements (T) are connected to the other three sub-pixels of the six sub-pixels one by one, and second path terminals of the other three switching elements (T) are connected to the three data signal lines one by one.

7. A detection circuit (100) as claimed in claim 6, wherein the relative potential of the video signal on only one of the three data signal lines is higher to drive the corresponding sub-pixel to display, and the relative potential of the video signal on the remaining two of the three data signal lines is lower than that of the video signal on the other two of the three data signal lines is not high enough to drive the corresponding sub-pixel to display, so as to detect a pure color picture.

8. A detection circuit (100) as claimed in claim 1, wherein the detection circuit (100) comprises three control signal lines and four data signal lines, and the specific connections of the six sub-pixels of two adjacent pixel units in each row are:

each control signal line is connected with the control ends of four corresponding switch elements (T), the first path ends of the four switch elements (T) are correspondingly connected with four sub-pixels in the six sub-pixels one by one, and the second path ends of the four switch elements (T) are correspondingly connected with the four data signal lines one by one; and eight switching elements (T) corresponding to any two control signal lines are connected with the six sub-pixels.

9. A detection circuit (100) as claimed in claim 8, wherein, during the corresponding time period of each frame, the relative potentials of the image signals on only a part of the four data signal lines are higher to drive the corresponding sub-pixel to display, while the relative potentials of the image signals on the other part of the four data signal lines are lower to drive the corresponding sub-pixel to display, so as to detect the pure color picture.

10. A liquid crystal display device, characterized in that it comprises a detection circuit (100) according to any one of claims 1 to 9.