CN114740648B - Display panel, driving method thereof and display device - Google Patents
Display panel, driving method thereof and display device Download PDFInfo
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- CN114740648B CN114740648B CN202210316426.2A CN202210316426A CN114740648B CN 114740648 B CN114740648 B CN 114740648B CN 202210316426 A CN202210316426 A CN 202210316426A CN 114740648 B CN114740648 B CN 114740648B
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000001514 detection method Methods 0.000 claims abstract description 70
- 239000000758 substrate Substances 0.000 claims abstract description 42
- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 19
- 239000010408 film Substances 0.000 claims description 54
- 239000003990 capacitor Substances 0.000 claims description 18
- 239000010409 thin film Substances 0.000 claims description 13
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 230000000694 effects Effects 0.000 abstract description 8
- 238000010586 diagram Methods 0.000 description 5
- 238000000059 patterning Methods 0.000 description 4
- 239000004020 conductor Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical compound [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
Classifications
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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
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3685—Details of drivers for data electrodes
- G09G3/3688—Details of drivers for data electrodes suitable for active matrices only
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3696—Generation of voltages supplied to electrode drivers
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
Abstract
The present application relates to a display panel, a driving method thereof, and a display device, the display panel including: an array substrate; the color film substrate is arranged opposite to the array substrate and comprises a color film public electrode layer, and the color film public electrode layer comprises at least one region to be detected; the liquid crystal layer is arranged between the color film substrate and the array substrate; and the at least one detection unit is arranged corresponding to the at least one region to be detected, and the detection unit is used for detecting the public voltage of the corresponding region to be detected, so that when the display panel displays, the pixel voltages of different regions in the display panel can be correspondingly compensated based on the public voltages of different regions in the display panel obtained by detection, and the actual display effect of the same pixel voltage at different positions is different due to the fact that the public voltages at different positions in the display panel deviate, and further the display uniformity of the display panel is improved.
Description
[ field of technology ]
The application relates to the technical field of display, in particular to a display panel, a driving method thereof and a display device.
[ background Art ]
The liquid crystal display panel (Liquid Crystal Display Panel) has the characteristics of low power consumption, mature process, no radiation and the like, and has now taken the dominant position in the field of flat panel display.
In the liquid crystal display panel, a pixel voltage is applied to a pixel electrode, and a common voltage is applied to a common electrode corresponding to the pixel electrode to deflect liquid crystal molecules therebetween, thereby realizing picture display.
However, since the common voltages at different positions in the display panel have deviations, the actual display effect of the same pixel voltage at different positions is different, and thus the display panel has a problem of uneven display during display.
[ application ]
The embodiment of the application provides a display panel, a driving method thereof and a display device, so as to improve the display uniformity of the display panel.
In order to solve the above-described problems, an embodiment of the present application provides a display panel including: an array substrate; the color film substrate is arranged opposite to the array substrate and comprises a color film public electrode layer, and the color film public electrode layer comprises at least one region to be detected; the liquid crystal layer is arranged between the color film substrate and the array substrate; and the at least one detection unit is arranged corresponding to the at least one region to be detected and is used for detecting the public voltage of the corresponding region to be detected.
The detection unit comprises a sensing electrode and a sensing line, wherein the sensing electrode is electrically connected to the sensing line and forms a sensing capacitor with a color film common electrode layer in a corresponding region to be detected, and the detection unit detects the common voltage of the corresponding region to be detected through the sensing capacitor.
The array substrate comprises a plurality of pixel electrodes which are arranged opposite to the color film public electrode layer, and the pixel electrodes and the sensing electrodes are arranged on the same layer.
The detection unit further comprises a sensing switch element, the sensing switch element and the sensing capacitor are connected in series through a sensing line, and the sensing line is used for reading a voltage signal on the sensing electrode when the sensing switch element is conducted.
The number of the detection units is multiple, the detection units are arranged in multiple rows, and all the detection units in the same row of detection units share the same sensing line.
The array substrate comprises a plurality of scanning lines arranged along a row direction, a plurality of data lines arranged along a column direction and a plurality of sub-pixel units defined by the scanning lines and the data lines and arranged in rows and columns, wherein the sensing switch elements are thin film transistors, and the grid electrodes of the sensing switch elements contained in each of the detection units in the same row of detection units are connected to the same scanning line.
Wherein, the display panel still includes: the adjusting unit is electrically connected with the detecting unit and comprises an analog-to-digital converter and a controller electrically connected with the analog-to-digital converter, wherein the analog-to-digital converter is used for performing analog-to-digital conversion on the public voltage detected by the detecting unit to obtain a digital signal, the obtained data signal is sent to the controller, the controller is used for comparing the digital signal with a preset public voltage value to obtain a comparison result, and the data voltage output by the data driver in the display panel is adjusted according to the comparison result.
In order to solve the above problems, an embodiment of the present application further provides a driving method of a display panel, which is applied to any one of the display panels, including: the driving detection unit detects a common voltage of the corresponding region to be detected.
The driving method of the display panel further comprises the following steps: performing analog-to-digital conversion on the public voltage detected by the detection unit to obtain a digital signal; comparing the digital signal with a preset public voltage value to obtain a comparison result; and adjusting the data voltage output by the data driver in the display panel according to the comparison result.
In order to solve the above problems, an embodiment of the present application also provides a display device including the display panel of any one of the above.
The beneficial effects of the application are as follows: compared with the prior art, the display panel, the driving method thereof and the display device provided by the application have the advantages that the detection unit is used for detecting the public voltage on the color film public electrode layer in the corresponding to-be-detected area, so that when the display panel displays, the pixel voltages in different areas in the display panel can be correspondingly compensated based on the detected public voltages in different areas in the display panel, the actual display effect of the same pixel voltage in different positions is prevented from being different due to the deviation of the public voltages in different positions in the display panel, and the display uniformity of the display panel is further improved.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic cross-sectional view of a display panel according to an embodiment of the present application;
fig. 2 is a schematic top view of a color film common electrode layer according to an embodiment of the present application;
FIG. 3 is a schematic top view of a sensing electrode and a sensing line according to an embodiment of the present application;
fig. 4 is a schematic diagram of a scenario in which a detection unit provided by an embodiment of the present application detects a common voltage of a corresponding area to be detected;
FIG. 5 is a schematic circuit diagram of a display panel according to an embodiment of the present application;
FIG. 6 is a schematic diagram of another circuit of the display panel according to the embodiment of the application;
fig. 7 is a flowchart of a driving method of a display panel according to an embodiment of the present application;
fig. 8 is a schematic structural diagram of a display device according to an embodiment of the present application.
[ detailed description ] of the application
The application is described in further detail below with reference to the drawings and examples. It is specifically noted that the following examples are only for illustrating the present application, but do not limit the scope of the present application. Likewise, the following examples are only some, but not all, of the examples of the present application, and all other examples, which a person of ordinary skill in the art would obtain without making any inventive effort, are within the scope of the present application.
Referring to fig. 1, fig. 1 is a schematic cross-sectional structure of a display panel according to an embodiment of the application. As shown in fig. 1, the display panel includes a color film substrate 10 and an array substrate 20 disposed opposite to each other, a liquid crystal layer 30 disposed between the color film substrate 10 and the array substrate 20, and at least one detection unit 40.
The color film substrate 10 includes a color film common electrode layer 11, and, as shown in fig. 2, the color film common electrode layer 11 includes at least one region 111 to be detected. The at least one detecting unit 40 is disposed corresponding to the at least one to-be-detected area 111, and the detecting unit 40 is configured to detect a common voltage of the corresponding to-be-detected area 111. Specifically, each to-be-detected area 111 may correspond to a separate detecting unit 40 for detecting the common voltage thereon, that is, the number of detecting units 40 and the number of to-be-detected areas 111 may be equal, for example, a plurality of detecting units.
It should be noted that, when the display panel displays, a common voltage is applied to the input end (e.g., the side end) of the color film common electrode layer 11, and then the common voltage is transmitted from the input end of the color film common electrode layer 11 to other positions of the color film common electrode layer 11. However, due to the ohmic voltage drop on the color film common electrode layer 11, the common voltages at the positions of the color film common electrode layer 11 closer to and farther from the input end are inconsistent, and if not processed, the actual display effects of the same pixel voltage at different positions in the display panel are different, so that the display uniformity of the display panel is affected.
Moreover, it can be understood that in this embodiment, by dividing the color film common electrode layer 11 into at least one to-be-detected area 111 and correspondingly setting a detection unit 40 for each to-be-detected area 111 to detect the common voltage of the to-be-detected area 111, the common voltages of different to-be-detected areas in the color film common electrode layer 11 can be obtained, so that the pixel voltages of different areas in the display panel can be compensated accordingly according to the detected common voltages of different areas in the display panel, so as to avoid different actual display effects of the same pixel voltages at different positions due to deviation of the common voltages at different positions in the display panel, thereby improving the display uniformity of the display panel.
Specifically, when the color film common electrode layer 11 is divided into the to-be-detected areas 111, the number of to-be-detected areas 111 and the area of each to-be-detected area 111 may be set according to the size of the display panel and the common voltage detection effect, which is not limited in this case. Further, it is understood that the color film common electrode layer 11 refers to a common electrode on the color film substrate 10 side in the display panel, and can provide a cathode to a sub-pixel unit in the display panel. Specifically, the color film common electrode layer 11 may be an entire film layer, and may be made of transparent conductive material such as indium tin oxide.
In one embodiment, as shown in fig. 1, 3 and 4, the detecting unit 40 may include a sensing electrode 41A and a sensing line 41B (or referred to as a sensing line), where the sensing electrode 41A is electrically connected to the sensing line 41B, and forms a sensing capacitor Csense with the color film common electrode layer 11 in the corresponding to-be-detected region 111. In addition, the detection unit 40 can specifically detect the common voltage V on the color film common electrode layer 11 in the corresponding to-be-detected region 111 through the sensing capacitor Csense included therein CF Com 。
Specifically, the two plates of the sensing capacitor Csense (i.e. the sensing electrode 41A and the color film common electrode layer 11 in the corresponding to-be-detected region 111) are insulated from each other and are disposed at opposite intervals, and the voltages thereof are related, for example, may be equal, so that the common voltage V of the to-be-detected region 111 opposite to the sensing electrode 41A can be determined by detecting the voltage of the sensing electrode 41A CF Com 。
Specifically, the material of the sensing electrode 41A may be the same as that of the sensing line 41B, for example, transparent conductive materials. In some embodiments, as shown in fig. 3, the sensing electrode 41A and the sensing line 41B may be connected as a single structure, and the sensing electrode 41A may correspond to a portion of the single structure opposite to the color film common electrode layer 11, and the sensing line 41B may correspond to a portion of the single structure not opposite to the color film common electrode layer 11.
In one embodiment, the sensing electrode 41A and the sensing line 41B may be disposed in the same layer and may be formed by the same patterning process.
In some embodiments, as shown in fig. 1, the array substrate 20 may include a plurality of pixel electrodes 21 disposed opposite to the color film common electrode layer 11, and the plurality of pixel electrodes 21 and the color film common electrode layer 11 may respectively provide an anode and a cathode to the sub-pixel unit in the display panel.
In addition, in order to save process steps, the sensing electrode 41A and/or the sensing line 41B may be disposed in the same layer as the pixel electrode 21 in the array substrate 20 and formed by the same patterning process.
In some embodiments, as shown in fig. 1, the color filter substrate 10 may further include a color filter layer 12, where the color filter layer 12 may be disposed on a side of the color filter common electrode layer 11 facing the array substrate 20, or may be disposed on a side of the color filter common electrode layer 11 facing away from the array substrate 20. Specifically, the color filter layer 12 may include a black matrix and a plurality of color filters, where a plurality of hollow areas are disposed on the black matrix, and the plurality of color filters may be respectively located in the plurality of hollow areas and disposed corresponding to the plurality of pixel electrodes 21.
It can be understood that in the display panel provided in the embodiment of the present application, a pixel electrode 21 and a color filter that are disposed correspondingly in the vertical direction and a portion of the liquid crystal layer 30 between them and a portion of the color film common electrode layer 11 at the corresponding position of the two may be defined to form a sub-pixel unit. When the display panel is required to be turned on, the pixel electrode 21 in the sub-pixel unit is applied with a pixel voltage (or a data voltage), and a part of the color film common electrode layer 11 in the sub-pixel unit is applied with a common voltage VCF Com, so that the liquid crystal molecules in the part of the liquid crystal layer 30 in the sub-pixel unit can deflect under the combined action of the pixel voltage and the common voltage VCF Com, and the light emitted by the backlight module in the display panel can be emitted after passing through the color filter in the sub-pixel unit, so as to realize display.
In some alternative embodiments, the sensing electrode 41A and the sensing line 41B may also be the same conductive structure, that is, the conductive structure can be the sensing electrode 41A and the sensing line 41B in the detecting unit 40, so that the material cost can be saved.
In some specific embodiments, as shown in fig. 3 and 4, the detection unit 40 may further include a sensing switch element 42 (or referred to as Tsense), wherein the sensing switch element 42 and the sensing capacitor Csense are connected in series through a sensing line 41B, and the sensing line 41B can be used to read the voltage signal on the sensing electrode 41A when the sensing switch element 42 is turned on.
In some embodiments, as shown in fig. 5, the number of the detecting units 40 may be plural, and the detecting units 40 may be arranged in plural columns, plural rows, or rows.
In addition, in the embodiment in which the plurality of detection units 40 are arranged in a plurality of columns, as shown in fig. 5, each detection unit 40 in the same column of detection units may correspond to one independent sensing line. In other embodiments, as shown in fig. 6, each of the detecting units 40 in the same row of detecting units may also share the same sensing line sensor line, so as to reduce the difficulty of the processing of the sensing line sensor line.
In the above embodiment, as shown in fig. 5 and 6, the array substrate 20 may include a plurality of Scan lines Scan line arranged along a row direction, a plurality of Data lines Data line arranged along a column direction, and a plurality of sub-pixel units pixel defined by the Scan lines Scan line and the Data lines Data line and arranged in rows and columns.
Wherein the sub-pixel unit pixel may include a pixel thin film transistor T1, a storage capacitor Cst, and a liquid crystal capacitor C LC . When the display panel displays that a certain sub-pixel unit needs to be turned on, the control end (i.e., gate) of the pixel thin film transistor T1 in the sub-pixel unit receives the Scan signal transmitted by the Scan line, and then the pixel thin film transistor T1 is turned on under the control of the Scan signal, so that the input end of the pixel thin film transistor T1 can receive the Data signal transmitted by the Data line, and the output end of the pixel thin film transistor T1 can transmit the Data signal to the first electrode of the storage capacitor Cst, and the second electrode of the storage capacitor Cst is grounded (or connected with the array common voltage V Array Com ). Thereafter, the liquid crystal capacitor C LC The liquid crystal capacitor C is driven by the potential generated by the first electrode coupled to the storage capacitor Cst according to the data signal LC The liquid crystal molecules between the two plates are polarized for display.
Specifically, in the embodiment in which the plurality of detection units 40 are arranged in multiple columns or in rows and columns, a column of detection units and a column of sub-pixel units may be disposed between every two adjacent data lines, that is, each column of sub-pixel units may correspond to one column of detection units, so that the accuracy of detecting the common voltage of the detection units 40 can reach the accuracy of each column of sub-pixel units. Also, in some alternative embodiments, at least one column of sub-pixel units may be disposed between every two adjacent columns of sub-pixel units, that is, there is one column of detection units corresponding to every at least two adjacent columns of sub-pixel units, for example, as shown in fig. 5, there is one column of detection units corresponding to every three adjacent columns of sub-pixel units, so that when every three adjacent columns of sub-pixel units form one column of pixel units, that is, one pixel unit is formed by three sub-pixel units, the accuracy of detecting the common voltage of the above-mentioned detection unit 40 can reach the accuracy of each column of pixel units.
Specifically, in the embodiment in which the plurality of detection units 40 are arranged in a plurality of rows or columns and rows, as shown in fig. 5, a row of detection units and a row of sub-pixel units may be disposed between every two adjacent Scan lines Scan line, that is, each row of sub-pixel units corresponds to one row of detection units, so that the accuracy of detecting the common voltage of the detection units 40 can reach the accuracy of each row of sub-pixel units. Also, in some alternative embodiments, at least one row of sub-pixel units may be disposed between every two adjacent rows of detection units, i.e., there is one row of detection units corresponding to every two adjacent rows of sub-pixel units.
In the above embodiment, the plurality of sub-pixel units pixel may include a red sub-pixel unit, a green sub-pixel unit, and a blue sub-pixel unit, specifically, each row of sub-pixel units may include a red sub-pixel unit, a green sub-pixel unit, and a blue sub-pixel unit that are periodically arranged in a row direction, and each sub-pixel unit pixel in the same column of sub-pixel units may be the same sub-pixel unit pixel, for example, each of the sub-pixel units pixel may be a red sub-pixel unit, a green sub-pixel unit, or a blue sub-pixel unit.
In the embodiment where the detection unit 40 includes the sensing switching element 42/Tsense, the sensing switching element 42/Tsense may be specifically a thin film transistor including a gate electrode, a source electrode, and a drain electrode. Specifically, one of the source and drain of the sense switching element 42/Tsense may be an input of the sense switching element 42/Tsense, and the other may be an output of the sense switching element 42/Tsense. Also, an input terminal of the sensing switching element 42/Tsense may be electrically connected to the sensing electrode 41A, and an output terminal of the sensing switching element 42/Tsense may be electrically connected to the sensing line 41B/Sense line.
In a specific embodiment, as shown in fig. 5 and 6, the gates of the sensing switch elements Tsense included in each detection unit 40 in the same row of detection units may be electrically connected to the same Scan line, so that the common voltage V of the region 111 to be detected is detected CF Com In this case, the gate driver in the display panel may be controlled to supply the Scan line with a turn-on signal, and the turn-on signal may be transmitted to the gate of the sensing switching element Tsense included in each of the detection units 40 in one row electrically connected to the Scan line via the Scan line, so that the sensing switching element Tsense included in each of the detection units 40 in the row is turned on, and the voltage signal on the sensing electrode 41A included in each of the detection units 40 in the row may be transmitted to the output terminal of the sensing switching element via the input terminal of the sensing switching element Tsense, so that the sensing line Sense line electrically connected to the output terminal of the sensing switching element Tsense may output the common voltage V of the corresponding region 111 to be detected CF Com . That is, the common voltage V of each of the detection regions 111 in one row corresponding to one row of detection units can be detected by inputting the on signal to one Scan line CF Com 。
Specifically, the on signal may be a voltage signal, and a voltage value corresponding to the voltage signal may be greater than a threshold voltage of the sensing switching element Tsense.
Specifically, in the embodiment in which the plurality of detecting units 40 are arranged in a plurality of rows or in a plurality of columns and rows, the detecting units 40 are driven row by row to detect the common voltage V of the corresponding region 111 to be detected by inputting the conducting signal to the Scan line connected to each row of detecting units row by row CF Com 。
In particular, the display of the display panel and the detection of the common voltage may be separated in time. Specifically, when the display panel displays, a Scan signal is supplied to the Scan line row by row, and a pixel voltage is supplied to the Data line to deflect the liquid crystal molecules, thereby realizing normal display of the display panel. And, when detecting the common voltage, a conducting signal is input to the Scan line connected to each row of detection units row by row, so that the voltage signal on the sensing electrode 41A in the detection unit 40 can be transmitted to the output end of the conducting sensing light-switching element Tsense via the conducting sensing light-switching element Tsense, thereby realizing the common voltage V to the different areas 111 to be detected in the color film common electrode layer 11 CF Com Is detected.
In the above embodiment, as shown in fig. 1, 5 and 6, the array substrate 20 may further include a thin film transistor layer 22, and the thin film transistor layer 22 can be used to provide two plates of the Pixel thin film transistor T1, the Scan line, the Data line and the storage capacitor Cst of the sub-Pixel unit Pixel in the display panel. Also, in order to save process steps, the gate electrode of the sensing switching element 41B/Tsense may be disposed on the same layer as the gate electrode of the pixel thin film transistor T1 and formed by the same patterning process, and the source electrode and the drain electrode of the sensing switching element 41B/Tsense may be disposed on the same layer as the source electrode and the drain electrode of the pixel thin film transistor T1 and formed by the same patterning process.
In the above embodiment, as shown in fig. 4, the display panel may further include an adjustment unit electrically connected to the detection unit 40, and the adjustment unit may include an analog-to-digital converter ADC (for example, a 16-bit analog-to-digital converter), and a controller (not shown) electrically connected to the analog-to-digital converter ADC. Specifically, the analog-to-digital converter ADC may be electrically connected to the output terminal of the sensing switching element 41B/Tsense to read the voltage signal on the sensing electrode 41A from the output terminal of the sensing switching element 41B/Tsense.
Specifically, the analog-to-digital converter ADC may be used to detect the common voltage V detected by the detecting unit 40 CF Com Performing analog-to-digital conversion to obtain a digital signal Raw Data, and sending the obtained Data signal Raw Data to a controller. The controller can be used for comparing the digital signal Raw Data with a preset public voltage value to obtain a comparison result, and adjusting the Data voltage (or called pixel voltage) output by the Data driver in the display panel according to the comparison result so as to compensate the pixel voltages in different areas in the display panel correspondingly, thereby avoiding the public voltage V in different positions in the display panel CF Com The display uniformity is affected due to the fact that the actual display effect of the same pixel voltage at different positions is different due to the deviation.
According to the display panel of the embodiment, the detection unit is used for detecting the public voltage on the color film public electrode layer in the corresponding to-be-detected area, so that when the display panel displays, the pixel voltages in different areas in the display panel can be correspondingly compensated based on the detected public voltages in different areas in the display panel, the fact that the same pixel voltage is different in different positions due to the fact that the public voltages in different positions in the display panel deviate is avoided, and further the display uniformity of the display panel is improved.
Referring to fig. 7, fig. 7 is a flowchart illustrating a driving method of a display panel according to an embodiment of the application. The driving method of the display panel is applied to the display panel of any embodiment, wherein the display panel comprises an array substrate and a color film substrate which are oppositely arranged, a liquid crystal layer arranged between the color film substrate and the array substrate, and at least one detection unit. The color film substrate comprises a color film public electrode layer, and the color film public electrode layer comprises at least one region to be detected. The at least one detection unit is arranged corresponding to the at least one region to be detected, and each detection unit is used for detecting the common voltage of the corresponding region to be detected. Further, the description about the display panel has been described in detail in the above embodiments, so that the description is omitted here. Specifically, as shown in fig. 7, the specific flow of the driving method of the display panel may be as follows:
s71: the driving detection unit detects a common voltage of the corresponding region to be detected.
In some embodiments, as shown in fig. 7, the driving method of the display panel may further include:
s72: and carrying out analog-to-digital conversion on the public voltage detected by the detection unit to obtain a digital signal.
The digital signal may specifically be a value corresponding to the common voltage of each to-be-detected area detected by the detection unit.
S73: and comparing the digital signal with a preset public voltage value to obtain a comparison result.
Specifically, the comparison result may specifically include a difference value between the common voltage of each of the areas to be detected and a preset common voltage value. For example, a difference between the common voltage of the first to-be-detected area and the preset common voltage value may be included as a first difference, a difference between the common voltage of the second to-be-detected area and the preset common voltage value is a second difference, and so on.
S74: and adjusting the data voltage output by the data driver in the display panel according to the comparison result.
Specifically, for each to-be-detected area, the data voltages (or referred to as pixel voltages) corresponding to all the pixel electrodes disposed opposite to the to-be-detected area in the display panel may be adjusted from the current value to the sum of the differences corresponding to the to-be-detected area, for example, the data voltages corresponding to all the pixel electrodes disposed opposite to the first to-be-detected area in the display panel may be adjusted from the current value V1 to the sum of the current value V1 and the first difference D1 (v1+d1), so that when the display panel displays, it is ensured that the liquid crystal deflection electric fields provided by the voltage differences of the color film common electrode layer and the pixel electrode at different positions in the display panel are in accordance with expectations, so as to ensure the display uniformity of the display panel.
According to the driving method of the display panel, the driving detection unit detects the public voltage of the corresponding region to be detected, so that when the display panel displays, the pixel voltages of different regions in the display panel can be correspondingly compensated based on the detected public voltages of different regions in the display panel, and the fact that the actual display effects of the same pixel voltages in different positions are different due to the fact that the public voltages of different positions in the display panel deviate is avoided, and further the display uniformity of the display panel is improved.
Referring to fig. 8, fig. 8 is a schematic structural diagram of a display device according to an embodiment of the application. The display device 80 includes the display panel 81 of any of the embodiments described above.
Specifically, the display panel 81 includes an array substrate and a color film substrate disposed opposite to each other, a liquid crystal layer disposed between the color film substrate and the array substrate, and at least one detection unit. The color film substrate comprises a color film public electrode layer, and the color film public electrode layer comprises at least one region to be detected. The at least one detection unit is arranged corresponding to the at least one region to be detected, and each detection unit is used for detecting the common voltage of the corresponding region to be detected.
According to the display device, the detection unit is used for detecting the public voltage on the color film public electrode layer in the corresponding to-be-detected area, so that when the display panel displays, the pixel voltages in different areas in the display panel can be correspondingly compensated based on the detected public voltages in different areas in the display panel, and the fact that the same pixel voltage is different in different positions due to the fact that the public voltages in different positions in the display panel deviate is avoided, and further the display uniformity of the display panel is improved.
The foregoing description of the preferred embodiments of the application is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the application.
Claims (6)
1. A display panel, the display panel comprising:
an array substrate;
the color film substrate is arranged opposite to the array substrate and comprises a color film public electrode layer, and the color film public electrode layer comprises at least one region to be detected;
the liquid crystal layer is arranged between the color film substrate and the array substrate; the method comprises the steps of,
the detection unit is arranged corresponding to the at least one region to be detected and is used for detecting the public voltage of the corresponding region to be detected;
the adjusting unit is electrically connected with the detecting unit and comprises an analog-to-digital converter and a controller electrically connected with the analog-to-digital converter, wherein the analog-to-digital converter is used for carrying out analog-to-digital conversion on the public voltage detected by the detecting unit to obtain a digital signal, the obtained digital signal is sent to the controller, and the controller is used for comparing the digital signal with a preset public voltage value to obtain a comparison result and adjusting the data voltage output by the data driver in the display panel according to the comparison result;
the detection unit comprises a sensing electrode and a sensing line, wherein the sensing electrode is electrically connected to the sensing line and forms a sensing capacitor with the color film public electrode layer in the corresponding region to be detected, and the detection unit detects the public voltage of the corresponding region to be detected through the sensing capacitor;
the detection unit further comprises a sensing switch element, the sensing switch element and the sensing capacitor are connected in series through the sensing line, and the sensing line is used for reading a voltage signal on the sensing electrode when the sensing switch element is conducted.
2. The display panel according to claim 1, wherein the array substrate includes a plurality of pixel electrodes disposed opposite to the color film common electrode layer, and the sensing electrode is disposed on the same layer as the pixel electrodes.
3. The display panel according to claim 1, wherein the number of the detecting units is plural, the detecting units are arranged in plural columns, and each detecting unit in the same column of detecting units shares the same sensing line.
4. The display panel of claim 1, wherein the number of the detecting units is plural, the plurality of detecting units are arranged in a plurality of rows, the array substrate includes a plurality of scanning lines arranged in a row direction, a plurality of data lines arranged in a column direction, and a plurality of sub-pixel units arranged in rows and columns defined by the scanning lines and the data lines,
and the sensing switch elements are thin film transistors, and the gates of the sensing switch elements included in the detection units in the same row of detection units are connected to the same scanning line.
5. A driving method of a display panel, characterized in that it is applied to the display panel according to any one of claims 1 to 4, comprising:
driving the detection unit to detect the public voltage of the corresponding region to be detected;
performing analog-to-digital conversion on the public voltage detected by the detection unit to obtain a digital signal;
comparing the digital signal with a preset public voltage value to obtain a comparison result;
and adjusting the data voltage output by the data driver in the display panel according to the comparison result.
6. A display device comprising the display panel of any one of claims 1-4.
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