CN113963646B - Pixel driving circuit, display panel, detection device and control method - Google Patents

Pixel driving circuit, display panel, detection device and control method Download PDF

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Publication number
CN113963646B
CN113963646B CN202111356658.2A CN202111356658A CN113963646B CN 113963646 B CN113963646 B CN 113963646B CN 202111356658 A CN202111356658 A CN 202111356658A CN 113963646 B CN113963646 B CN 113963646B
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China
Prior art keywords
level signal
discharge
control
control module
display area
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CN113963646A (en
Inventor
王兴明
蔡鹏�
王纯杰
杨军
张灿
杜江
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BOE Technology Group Co Ltd
Chongqing BOE Optoelectronics Technology Co Ltd
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BOE Technology Group Co Ltd
Chongqing BOE Optoelectronics Technology Co Ltd
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
    • 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
    • G09G3/3607—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 for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

The embodiment of the application provides a pixel driving circuit, a display panel, a detection device and a control method. The pixel driving unit in the pixel driving circuit includes: the first level signal end is used for receiving a discharge driving signal in a discharge mode; the discharge control module is electrically connected with the first level signal end and is used for conducting the first level signal end with the control end of the pixel circuit in the display area in a discharge mode; and the heating control module is electrically connected with the first level signal end and is used for conducting the first level signal end with the heating resistor of the display area in a discharging mode. According to the embodiment of the application, the liquid crystal layer is heated by the resistor layer in the detected discharge mode, the liquid crystal molecules polarized by the influence of static electricity are rearranged by heating the liquid crystal layer, the static electricity discharge speed of the display area is accelerated, the static electricity discharge is enabled to be more thorough, the interference of static electricity residues on judging detection results is reduced, the detection precision is improved, and the detection efficiency is also improved.

Description

Pixel driving circuit, display panel, detection device and control method
Technical Field
The present application relates to the field of display technologies, and in particular, to a pixel driving circuit, a display panel, a detection device, and a control method.
Background
Oxide materials have gradually replaced a-si (amorphous silicon) materials for high-end LCD (Liquid Crystal Display ) products due to their high electron mobility, low leakage current, etc., and meet the user demands of high refresh rates. However, the oxide product has unstable characteristics, which easily causes residual charges, and particularly, the liquid crystal with low cell thickness and low dielectric constant is adopted, static electricity is more easily introduced, and the residual static electricity causes polarization of the liquid crystal, so that poor display is caused.
The LCD product using the oxide material may show defects of transverse lines, vertical lines and mura (moire, uneven) due to the static electricity residue in the detection process, and the occurrence rate is up to 30%, which not only affects the detection and judgment of conventional defects, but also wastes productivity and manpower. It is therefore necessary to reduce or even eliminate static electricity before lighting detection.
Disclosure of Invention
The application provides a pixel driving circuit, a display panel, a detection device and a control method aiming at the defects of the prior art, and is used for solving the technical problem that the detection of an LCD product adopting an oxide material in the prior art is easy to cause errors in the judgment result.
In a first aspect, embodiments of the present application provide a pixel driving unit, including:
The first level signal end is used for receiving a discharge driving signal in a discharge mode;
the discharge control module is electrically connected with the first level signal end and is used for conducting the first level signal end with the control end of the pixel circuit in the display area in a discharge mode;
and the heating control module is electrically connected with the first level signal end and is used for conducting the first level signal end with the heating resistor of the display area in a discharging mode.
In one embodiment, the discharge control module is configured to conduct the first level signal terminal with a control terminal of a pixel circuit in the display area, and the heating control module is configured to conduct the first level signal terminal with a heating resistor of the display area.
In one embodiment, the pixel driving unit further includes: a second level signal terminal; the second level signal end is used for receiving a heating control signal;
the heating control module includes: the first input end, the first output end and the first control end; the first input end is electrically connected with the first level signal end; the first output end is used for electrically connecting the heating resistor of the display area; the first control end is electrically connected with the second level signal end and is used for conducting the first input end and the first output end under the control of the heating control signal.
In one embodiment, the heating control module includes: the first input end, the first output end and the first control end;
the first input end is electrically connected with the first level signal end;
the first output end is used for electrically connecting the heating resistor of the display area;
the first control end is also electrically connected with the first level signal end and is used for conducting the first input end and the first output end under the control of the first level signal.
In one embodiment, the pixel driving unit further includes: a third level signal terminal; the third level signal end is used for receiving a discharge control signal in a discharge mode;
the discharge control module includes: the second input end, the second output end and the second control end; the second input end is electrically connected with the first level signal end; the second output end is used for electrically connecting the control end of the pixel circuit in the display area; the second control end is electrically connected with the discharge control signal input end and is used for conducting the second input end and the second output end under the control of the discharge control signal.
In a second aspect, embodiments of the present application provide a pixel driving circuit, including: the pixel driving unit as provided in the first aspect.
In one embodiment, the pixel driving unit includes at least two groups; the second level signal end in the nth pixel driving unit is electrically connected with the output end of the heating control module in the (n-1) th pixel driving unit; n is a positive integer greater than 1.
In a third aspect, embodiments of the present application provide a display panel, including: a pixel circuit and a heating resistor respectively located in the display area, and a pixel driving circuit as provided in the second aspect;
the discharging control module in the pixel driving circuit is electrically connected with the control end of the pixel circuit;
the heating control module in the pixel driving circuit is electrically connected with the heating resistor.
In a fourth aspect, embodiments of the present application provide a detection apparatus, including:
a controller for transmitting a discharge driving signal to the first level signal terminal of the pixel driving circuit in the display panel provided in the third aspect in the discharge mode, and controlling the discharge control module in the pixel driving circuit to conduct the first level signal terminal with the control terminal of the pixel circuit in the display area, and controlling the heating control module in the pixel driving circuit to conduct the first level signal terminal with the heating resistor of the display area, and then generating a ground control signal;
the discharger comprises a third input end, a third output end and a third control end; the third input end is used for being electrically connected with the pixel circuit of the display panel; the third output end is used for grounding; the third control end is electrically connected with the controller and is used for conducting the third input end and the third output end under the control of the grounding control signal.
In a fifth aspect, an embodiment of the present application provides a control method based on the detection device provided in the fourth aspect, including:
in a first period, a controller in the detection device sends a discharge driving signal to a first level signal end of a pixel driving circuit in the display panel, and controls a discharge control module in the pixel driving circuit to conduct the first level signal end with a control end of a pixel circuit in the display area, and controls a heating control module in the pixel driving circuit to conduct the first level signal end with a heating resistor of the display area.
In one embodiment, the control method further comprises: and in a second period after the first period, the controller stops sending the discharge driving signal to the first level signal end of the pixel driving circuit in the display panel, controls the discharge control module to keep the first level signal end conductive with the control end of the pixel circuit in the display area, and controls the heating control module to keep the first level signal end conductive with the heating resistor of the display area.
In one embodiment, the control method further comprises: and in a third period after the second period, the controller controls the discharge control module to disconnect the first level signal end from the control end of the pixel circuit in the display area, and controls the heating control module to disconnect the first level signal end from the heating resistor of the display area.
In one embodiment, the control method further comprises: in a fourth period after the third period, the controller generates a ground control signal, and the discharger in the detection device turns on the third input terminal and the third output terminal according to the ground control signal received by the third control terminal.
The beneficial technical effects that technical scheme that this application embodiment provided brought include: in the discharge mode of detection, add through the resistive layer to the liquid crystal layer heating, the liquid crystal layer heating makes the liquid crystal molecules that are influenced by static and polarize rearrange to accelerate the static discharge speed in display area, so that the static discharge is more thorough, reduces the interference of static residue to judging the testing result, thereby promotes the detection precision, has also improved detection efficiency.
Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application.
Drawings
The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:
fig. 1 is a schematic diagram of a frame structure of a pixel driving unit according to an embodiment of the present application;
Fig. 2 is a schematic circuit diagram of a first embodiment of a pixel driving unit according to an embodiment of the present application;
fig. 3 is a schematic circuit diagram of a second embodiment of a pixel driving unit according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of a display panel according to an embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of a connection between a detection device and a display panel according to an embodiment of the present application;
fig. 6 is a flow chart of a detection method of a detection device according to an embodiment of the present application;
fig. 7 is a driving timing chart of the detection device in the discharging mode according to the embodiment of the present application.
A 100-pixel driving unit; 101-a first level signal terminal; 102-a second level signal terminal; 103-a third level signal terminal; 110-a heating control module; 120-a discharge control module;
200-a display panel;
210-a first substrate; 211-a source/drain layer; 212-a first conductive layer; 213-a second conductive layer;
220-a second substrate; 221-black matrix; 222—heating resistance;
230-a liquid crystal layer;
300-detecting device; 310-a controller; 320-discharger.
Detailed Description
Examples of embodiments of the present application are illustrated in the accompanying drawings, in which like or similar reference numerals refer to like or similar elements or elements having like or similar functionality throughout. Further, if detailed description of the known technology is not necessary for the illustrated features of the present application, it will be omitted. The embodiments described below by referring to the drawings are exemplary only for the purpose of illustrating the present application and are not to be construed as limiting the present application.
It will be understood by those skilled in the art that all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs unless defined otherwise. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless expressly stated otherwise, as understood by those skilled in the art. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or wirelessly coupled. The term "and/or" as used herein includes all or any element and all combination of one or more of the associated listed items.
The inventors of the present application studied and found that LCD products using oxide materials show defects in the form of transverse lines, vertical lines, and mura (moire, uneven) due to the static electricity remaining during the detection process, with occurrence rate as high as 30%, and greatly affected detection and judgment of conventional defects. It is therefore necessary to reduce or even eliminate static electricity before lighting detection.
The inventors of the present application have continued research and found that the degree of electrostatic discharge can be increased by extending the duration of the discharge state, but this lengthens the detection period, decreases the detection efficiency, and wastes productivity and labor of the production line.
The application provides a pixel driving unit, a pixel driving circuit, a display panel, a detection device and a control method, and aims to solve the technical problems in the prior art.
The following describes the technical solutions of the present application and how the technical solutions of the present application solve the above technical problems in detail with specific embodiments.
The embodiment of the present application provides a pixel driving unit 100, and a schematic structural diagram of the pixel driving unit 100 is shown in fig. 1, including: a first level signal terminal 101, a discharge control module 120 and a heating control module 110.
The first level signal terminal 101 is used for receiving a discharge driving signal in a discharge mode.
The discharge control module 120 is electrically connected to the first level signal terminal 101, and is configured to conduct the first level signal terminal 101 with a control terminal of a pixel circuit in the display area in a discharge mode.
The heating control module 110 is electrically connected to the first level signal terminal 101, and is configured to conduct the first level signal terminal 101 and the heating resistor 222 of the display area in the discharging mode.
In this embodiment, the discharge control module 120 in the pixel driving unit 100 is configured to conduct the first level signal terminal 101 with the control terminal of the pixel circuit in the display area in the discharge mode, so as to realize the discharge driving of the pixel circuit in the display area and discharge static electricity.
The heating control module 110 in the pixel driving unit 100 is configured to conduct the first level signal terminal 101 with the heating resistor 222 in the display area in the discharging mode, so as to charge the heating resistor 222 in the display area, that is, the heating resistor 222 starts to work and heats the liquid crystal layer 230, so that the polarized liquid crystal molecules affected by static electricity are rearranged, and the static electricity discharge speed of the display area is accelerated, so that the static electricity discharge is more thorough.
In the discharge mode, the discharge control module 120 and the heating control module 110 in the pixel driving unit 100 cooperate to reduce interference of static electricity residue on the determination detection result, thereby improving detection accuracy. And the duration of the discharge state is not required to be prolonged, so that the detection efficiency is effectively improved, the power-assisted production line capacity is improved, and the labor is saved.
The input sources of the discharge control module 120 and the heating control module 110 share the discharge driving signal received by the first level signal end 101 in the discharge mode, which is beneficial to simplifying the circuit structure, saving energy and reducing cost.
In some possible embodiments, the discharge mode of the pixel driving circuit may be performed before the current lighting detection to improve the accuracy of the upcoming lighting detection.
In one example, the discharge mode of the pixel driving circuit may be started at the last frame of the previous detection picture.
In some possible embodiments, the discharge mode of the pixel driving circuit may also discharge the static electricity introduced in the current lighting detection after the current lighting detection, so as to eliminate possible static influence for subsequent other detection or use.
In some possible embodiments, the discharge control module 120 is configured to conduct the first level signal terminal 101 to the control terminal of the pixel circuit in the display area, and the heating control module 110 is configured to conduct the first level signal terminal 101 to the heating resistor 222 in the display area.
In this embodiment, the discharge control module 120 starts to conduct the first level signal terminal 101 to the control terminal of the pixel circuit in the display area, and the heating control module 110 starts to conduct the first level signal terminal 101 to the heating resistor 222 in the display area. This is advantageous in more synchronizing the start of the heating drive and the discharge drive, improving the synergy between the discharge control module 120 and the heating control module 110, shortening the discharge period, and improving the detection efficiency.
The inventor of the present application considers that the heating control module 110 needs to conduct the first level signal terminal 101 and the heating resistor 222 of the display area in the discharging mode, and the heating control module 110 also needs to perform the foregoing actions in good time according to the corresponding control signals. To this end, the present application provides two possible implementations for the pixel driving unit 100 as follows:
in a first possible embodiment, as shown in fig. 2, the pixel driving unit 100 further includes: a second level signal terminal 102. The second level signal terminal 102 is configured to receive a heating control signal.
The heating control module 110 includes: the first input end, the first output end and the first control end. The first input terminal is electrically connected to the first level signal terminal 101. The first output terminal is electrically connected to the heating resistor 222 of the display area. The first control terminal is electrically connected to the second level signal terminal 102, and is configured to conduct the first input terminal with the first output terminal under the control of the heating control signal.
In this embodiment, the heating control module 110 controls the first input terminal to be conducted with the first output terminal according to the heating control signal received by the first control terminal from the second level signal terminal 102, so as to conduct the first level signal terminal 101 with the heating resistor 222 of the display area according to the heating control signal, and further realize charging of the heating resistor 222 in the display area, that is, the heating resistor 222 starts to work and heats the liquid crystal layer 230, so that the polarized liquid crystal molecules affected by static electricity are rearranged, and the static electricity discharge speed of the display area is accelerated, so that the static electricity discharge is more thorough.
In this embodiment, the first control end of the heating control module 110 is electrically connected to the second level signal end 102, which is favorable for the heating control module 110 to realize independent control and is favorable for compatibility with diversified control scenarios.
In some examples, the second level signal terminal 102 may be electrically connected to an external controller 310.
In some examples, the second level signal terminal 102 in the current-stage pixel driving unit 100 may be electrically connected to the first output terminal of the heating control module 110 in the previous-stage pixel driving unit 100, that is, the output signal of the heating control module 110 in the previous-stage pixel driving unit 100 is used as the control signal of the heating control module 110 in the current-stage pixel driving unit 100.
In a second possible embodiment, as shown in fig. 3, the heating control module 110 includes: the first input end, the first output end and the first control end.
The first input terminal is electrically connected to the first level signal terminal 101.
The first output terminal is electrically connected to the heating resistor 222 of the display area.
The first control terminal is also electrically connected to the first level signal terminal 101, and is configured to conduct the first input terminal with the first output terminal under the control of the first level signal.
In this embodiment, the first control end and the first input end of the heating control module 110 are electrically connected to the first level signal end 101, so that the discharge driving signal received by the first level signal end 101 can be used as the heating control signal of the heating control module 110 and can be used for charging the heating resistor 222 in the display area, that is, a control circuit of the heating control module 110 is not required to be designed independently, which is beneficial to simplifying the circuit structure of the pixel driving unit 100 and simplifying the circuit structure of the external controller 310.
In this embodiment, the heating control module 110 uses the discharge driving signal received by the first level signal terminal 101 as the heating control signal to control the first input terminal to be conducted with the first output terminal, so as to conduct the first level signal terminal 101 with the heating resistor 222 of the display area according to the heating control signal, and further realize charging of the heating resistor 222 in the display area, that is, the heating resistor 222 starts to work and heats the liquid crystal layer 230, so that the polarized liquid crystal molecules affected by static electricity are rearranged, and the static electricity discharge speed of the display area is accelerated, so that the static electricity discharge is more thorough.
The inventor of the present application considers that the discharge control module 120 needs to conduct the first level signal terminal 101 with the control terminal of the pixel circuit in the display area in the discharge mode, and the discharge control module 120 also needs to perform the foregoing actions in good time according to the corresponding control signals. To this end, the present application provides one possible implementation of the pixel driving unit 100 as follows:
in the present embodiment, as shown in fig. 2 or 3, the pixel driving unit 100 further includes: a third level signal terminal 103. The third level signal terminal 103 is configured to receive a discharge control signal in a discharge mode.
The discharge control module 120 includes: the second input end, the second output end and the second control end. The second input terminal is electrically connected to the first level signal terminal 101. The second output end is used for being electrically connected with the control end of the pixel circuit in the display area. The second control end is electrically connected with the discharge control signal input end and is used for conducting the second input end and the second output end under the control of the discharge control signal.
In this embodiment, the discharge control module 120 controls the second input terminal to be conducted with the second output terminal according to the discharge control signal received by the second control terminal from the third level signal terminal 103, so as to conduct the first level signal terminal 101 with the control terminal of the pixel circuit in the display area according to the discharge control signal, and further realize the discharge driving of the pixel circuit in the display area, and discharge static electricity.
Based on the same inventive concept, embodiments of the present application provide a pixel driving circuit including: the pixel driving unit 100 as provided in any of the foregoing embodiments.
In this embodiment, since the pixel driving circuit includes any of the pixel driving units 100 provided in the foregoing embodiment, the implementation principle is similar, and will not be described here again.
In some possible embodiments, the pixel driving unit 100 includes at least two groups.
The second level signal terminal 102 of the nth pixel driving unit 100 is electrically connected to the output terminal of the heating control module 110 of the n-1 th pixel driving unit 100. n is a positive integer greater than 1.
In this embodiment, the second level signal terminal 102 in the current-stage pixel driving unit 100 may be electrically connected to the first output terminal of the heating control module 110 in the previous-stage pixel driving unit 100, that is, the output signal of the heating control module 110 in the previous-stage pixel driving unit 100 is used as the control signal of the heating control module 110 in the current-stage pixel driving unit 100.
Based on the same inventive concept, the embodiments of the present application provide a display panel 200, as shown in fig. 4, the display panel 200 includes: a pixel circuit (not shown) and a heating resistor 222 respectively located in the display area, and a pixel driving circuit as provided in any of the foregoing embodiments.
The discharge control module 120 in the pixel driving circuit is electrically connected to the control terminal of the pixel circuit.
The heating control module 110 in the pixel driving circuit is electrically connected to the heating resistor 222.
In the embodiment, in the pixel driving unit 100 of the display panel 200, the discharge control module 120 is configured to conduct the first level signal terminal 101 with the control terminal of the pixel circuit in the display area in the discharge mode, so as to realize the discharge driving of the pixel circuit in the display area and discharge static electricity.
In the pixel driving unit 100 of the display panel 200, the heating control module 110 is configured to conduct the first level signal terminal 101 with the heating resistor 222 of the display area in the discharging mode, so as to charge the heating resistor 222 in the display area, that is, the heating resistor 222 starts to work and heats the liquid crystal layer 230, so that the liquid crystal molecules polarized under the influence of static electricity are rearranged, and the static electricity discharge speed of the display area is accelerated, so that the static electricity discharge is more thorough.
In the discharge mode, the discharge control module 120 and the heating control module 110 in the pixel driving unit 100 cooperate to reduce interference of static electricity residue on the determination detection result, thereby improving detection accuracy. And the duration of the discharge state is not required to be prolonged, so that the detection efficiency is effectively improved, the power-assisted production line capacity is improved, and the labor is saved.
The input sources of the discharge control module 120 and the heating control module 110 share the discharge driving signal received by the first level signal end 101 in the discharge mode, which is beneficial to simplifying the circuit structure, saving energy and reducing cost.
In some possible embodiments, the display panel 200 may include: a first substrate 210, a second substrate 220, and a liquid crystal layer 230 between the first substrate 210 and the second substrate 220.
The first substrate 210 may employ a TFT (Thin Film Transistor ) substrate structure in keeping with the existing design. Specifically, the first substrate 210 may include: the display device comprises a gate layer, a source drain electrode layer 211, a first conductive layer 212 and a second conductive layer 213, wherein the second conductive layer 213 is a pixel electrode, and the first conductive layer 212 is a common electrode.
The second substrate 220 may adopt a color film substrate structure, and the heating resistor 222 is added on the basis of a conventional color film substrate structure. Specifically, the second substrate 220 may include: the R (red) G (green) B (blue) resistance, OC (cover plate) and PS layers, not shown in the figure, are provided with a heating resistor 222 layer on the TFT side at a position corresponding to the black matrix 221, and the projection of the heating resistor 222 layer on the second substrate 220 may be located within the projection of the black matrix 221 on the second substrate 220, in order not to affect the transmittance.
Based on the same inventive concept, an embodiment of the present application provides a detection apparatus 300, and a schematic structural diagram of the detection apparatus 300 is shown in fig. 5, including: a controller 310 and a discharger 320.
The controller 310 is configured to send a discharge driving signal to the first level signal terminal 101 of the pixel driving circuit in the display panel 200 according to any one of the foregoing embodiments in the discharge mode, and control the discharge control module 120 in the pixel driving circuit to conduct the first level signal terminal 101 with the control terminal of the pixel circuit in the display area, and control the heating control module 110 in the pixel driving circuit to conduct the first level signal terminal 101 with the heating resistor 222 in the display area, and then generate a ground control signal.
The discharger 320 includes a third input terminal, a third output terminal, and a third control terminal. The third input terminal is used for being electrically connected with the pixel circuit of the display panel 200. The third output terminal is used for grounding. The third control terminal is electrically connected to the controller 310, and is configured to conduct the third input terminal with the third output terminal under the control of the ground control signal.
In this embodiment, the controller 310 in the detection device 300 controls the discharge control module 120 and the heating control module 110 in the pixel driving circuit of the display panel 200 respectively, so that the discharge control module 120 and the heating control module 110 in the pixel driving circuit cooperate to reduce the interference of static electricity residue on the determination detection result in the discharge mode of the display panel 200, thereby improving the detection accuracy. And the duration of the discharge state is not required to be prolonged, so that the detection efficiency is effectively improved, the power-assisted production line capacity is improved, and the labor is saved.
The discharge control module 120 and the heating control module 110 share the discharge driving signal received by the first level signal terminal 101 in the discharge mode, which is not only beneficial to simplifying the circuit structure of the pixel driving circuit, but also beneficial to simplifying the circuit structure of the controller 310 in the detection device 300, and saving energy and reducing cost.
In some possible embodiments, the detecting device 300 further includes a lighting machine, where the lighting machine is configured to be electrically connected to the pixel driving circuit of the display panel 200, and provide a display driving signal to the pixel driving circuit, so that the display panel 200 displays a specified picture according to the display driving signal.
In some possible embodiments, the controller 310 may be an IC chip (IntegratedCircuit Chip), a CPU (Central Processing Unit ), or other upper computers. The controller 310 may also be integrated into the lighting fixture.
In some possible embodiments, the discharger 320 may be a discharge board, an electronically controlled switch of which is electrically connected to the controller 310, and an input terminal of the discharge board receives static electricity in the pixel circuit of the display panel 200 and is grounded through an output terminal of the discharge board to sufficiently discharge the static electricity.
Based on the same inventive concept, the embodiment of the present application provides a control method of the detection device 300 provided based on any one of the foregoing embodiments, including the steps of:
in the first period, the controller 310 in the detecting device 300 sends a discharge driving signal to the first level signal terminal 101 of the pixel driving circuit in the display panel 200, and controls the discharge control module 120 in the pixel driving circuit to conduct the first level signal terminal 101 with the control terminal of the pixel circuit in the display area, and controls the heating control module 110 in the pixel driving circuit to conduct the first level signal terminal 101 with the heating resistor 222 of the display area.
In the control method of the detection device 300 in this embodiment, the controller 310 controls the discharge control module 120 and the heating control module 110 in the pixel driving circuit of the display panel 200 respectively, so that the discharge control module 120 and the heating control module 110 in the pixel driving circuit cooperate to reduce the interference of static electricity residue on the determination detection result in the discharge mode of the display panel 200, thereby improving the detection accuracy. And the duration of the discharge state is not required to be prolonged, so that the detection efficiency is effectively improved, the power-assisted production line capacity is improved, and the labor is saved.
In addition, in the control process, the input sources of the discharge control module 120 and the heating control module 110 share the discharge driving signal received by the first level signal terminal 101 in the discharge mode, which is not only beneficial to simplifying the circuit structure of the pixel driving circuit, but also beneficial to simplifying the circuit structure of the controller 310 in the detection device 300, and saving energy and reducing cost.
In some possible embodiments, the controller 310 in the detecting device 300 controls the discharge control module 120 to start to conduct the first level signal terminal 101 with the control terminal of the pixel circuit in the display area, and the heating control module 110 starts to conduct the first level signal terminal 101 with the heating resistor 222 in the display area, so that it is beneficial to more synchronize the start of the heating driving and the discharge driving, to improve the coordination between the discharge control module 120 and the heating control module 110, to shorten the discharge period, and to improve the detection efficiency.
The embodiment of the application further provides an extension method of the control method of the detection device 300, and a flow chart of the method is shown in fig. 6, including steps S101-S104:
s101: in the first period, the controller 310 in the detecting device 300 sends a discharge driving signal to the first level signal terminal 101 of the pixel driving circuit in the display panel 200, and controls the discharge control module 120 in the pixel driving circuit to conduct the first level signal terminal 101 with the control terminal of the pixel circuit in the display area, and controls the heating control module 110 in the pixel driving circuit to conduct the first level signal terminal 101 with the heating resistor 222 of the display area.
Through step S101, the pixel driving circuit in the display panel 200 is turned on, so as to facilitate the electrostatic discharge, and the heating resistor 222 starts heating the display area, so as to accelerate the electrostatic discharge of the display area.
S102: in the second period, the controller 310 stops sending the discharge driving signal to the first level signal terminal 101 of the pixel driving circuit in the display panel 200, and controls the discharge control module 120 to keep the first level signal terminal 101 conductive to the control terminal of the pixel circuit in the display area, and controls the heating control module 110 to keep the first level signal terminal 101 conductive to the heating resistor 222 of the display area.
In step S102, the heating of the display area by the heating resistor 222 is stopped, the first level signal terminal 101 is kept on with the control terminal of the pixel circuit in the display area, and the heating control module 110 is controlled to keep the first level signal terminal 101 on with the heating resistor 222 in the display area, so that the residual static electricity in the pixel driving circuit of the display panel 200 and the static electricity possibly remained in the heating resistor 222 are continuously discharged outwards (for example, at the discharger 320), so that the static electricity discharge is more thorough.
S103: in the third period, the controller 310 controls the discharge control module 120 to disconnect the first level signal terminal 101 from the control terminal of the pixel circuit in the display area, and controls the heating control module 110 to disconnect the first level signal terminal 101 from the heating resistor 222 of the display area.
In step S103, after the first level signal terminal 101 is disconnected from the control terminal of the pixel circuit in the display area and the first level signal terminal 101 is disconnected from the heating resistor 222 in the display area, the pixel driving circuit in the display panel 200 is ready for subsequent lamp detection or other detection.
S104: in the fourth period, the controller 310 generates a ground control signal, and the discharger 320 in the detecting apparatus 300 turns on the third input terminal and the third output terminal according to the ground control signal received by the third control terminal.
Through step S104, the discharger 320 can discharge the static electricity led out from the pixel circuit of the display panel 200 to the ground, thereby completing the whole electrostatic discharge process.
The technical solution described above in the present application will be described below with reference to a specific embodiment.
A control method of the detection apparatus 300, the discharge process includes 5 stages, as shown in the timing sequence in fig. 7:
stage T0: in the stage of preparation for discharging, no actual work is performed, and a buffer function is achieved.
Stage T1: in the discharging stage of the pixel circuit, VDDe (the third level signal terminal 103) is at a high level, M5B is turned on, PD2 (the pull-down node) is at a high level, M13B (the discharging control module 120) is turned on, VGL (the first level signal terminal 101) is at a high level, the pixel circuit is turned on, the AA (display) area starts discharging, meanwhile Rx (the second level signal terminal 102) is at a high level, MX (the heating control module 110) is turned on, VGL is at a high level, rx_out (the heating resistor 222) is charged, that is, the heating resistor 222 starts working, the polarized liquid crystal molecules under the electrostatic influence are rearranged under the heating action, the heating accelerates the discharging speed of the AA area, and the electrostatic discharging and the heating process are simultaneously carried Out, so as to achieve the purpose of more thorough charge discharging.
Stage T2: in the Gate layer discharge phase, TRST is high, LVGL is low, M15 is on, PU (pull-up node) voltage is pulled down, VGL is low, and charges of Rx Line (heating resistor driving Line) and Gate Line (pixel circuit driving Line) in each pixel driving unit in the pixel driving circuit are discharged.
Stage T3: in the signal off phase, all signals go to 0 at this time, and all TFTs of the pixel circuit are turned off.
Stage T4: in the Vcom (common voltage of display panel) discharge phase, the discharger is turned on at the high level of the intermediate period switch X (control signal of discharger) of T4, and at this time, residual charges at both the display panel side and the igniter side are sufficiently discharged through the ground, and the discharge ends.
The whole discharging process is only carried out under the last picture of lighting detection, rx and switch X only work for signals at the moment, the signals are not acted later, and the working voltage of Rx is VGL, so that normal lighting is not influenced.
By applying the embodiment of the application, at least the following beneficial effects can be realized:
1. the discharge control module 120 in the pixel driving unit 100 is configured to conduct the first level signal terminal 101 with the control terminal of the pixel circuit in the display area in the discharge mode, so as to realize discharge driving of the pixel circuit in the display area and discharge static electricity.
2. The heating control module 110 in the pixel driving unit 100 is configured to conduct the first level signal terminal 101 with the heating resistor 222 in the display area in the discharging mode, so as to charge the heating resistor 222 in the display area, that is, the heating resistor 222 starts to work and heats the liquid crystal layer 230, so that the polarized liquid crystal molecules affected by static electricity are rearranged, and the static electricity discharge speed of the display area is accelerated, so that the static electricity discharge is more thorough.
3. In the discharge mode, the discharge control module 120 and the heating control module 110 in the pixel driving unit 100 cooperate to reduce interference of static electricity residue on the determination detection result, thereby improving detection accuracy. And the duration of the discharge state is not required to be prolonged, so that the detection efficiency is effectively improved, the power-assisted production line capacity is improved, and the labor is saved.
4. The input sources of the discharge control module 120 and the heating control module 110 share the discharge driving signal received by the first level signal end 101 in the discharge mode, which is beneficial to simplifying the circuit structure, saving energy and reducing cost.
5. The discharge control module 120 is started to conduct the first level signal terminal 101 to the control terminal of the pixel circuit in the display area, and the heating control module 110 is started to conduct the first level signal terminal 101 to the heating resistor 222 in the display area, which simultaneously occurs. This is advantageous in more synchronizing the start of the heating drive and the discharge drive, improving the synergy between the discharge control module 120 and the heating control module 110, shortening the discharge period, and improving the detection efficiency.
6. The first control end of the heating control module 110 is electrically connected with the second level signal end 102, which is favorable for realizing independent control of the heating control module 110 and is favorable for being compatible with diversified control scenes.
7. The first control end and the first input end of the heating control module 110 are electrically connected with the first level signal end 101, so that the discharge driving signal received by the first level signal end 101 can be used as the heating control signal of the heating control module 110 and can be used for charging the heating resistor 222 in the display area, that is, a control circuit of the heating control module 110 is not required to be designed independently, the circuit structure of the pixel driving unit 100 is simplified, and the circuit structure of the external controller 310 is also simplified.
8. The discharge control module 120 controls the second input end to be conducted with the second output end according to the discharge control signal received by the second control end from the third level signal end 103, so that the first level signal end 101 is conducted with the control end of the pixel circuit in the display area according to the discharge control signal, and further discharge driving of the pixel circuit in the display area is realized, and static electricity is discharged.
Those of skill in the art will appreciate that the various operations, methods, steps in the flow, actions, schemes, and alternatives discussed in the present application may be alternated, altered, combined, or eliminated. Further, other steps, means, or steps in a process having various operations, methods, or procedures discussed in this application may be alternated, altered, rearranged, split, combined, or eliminated. Further, steps, measures, schemes in the prior art with various operations, methods, flows disclosed in the present application may also be alternated, altered, rearranged, decomposed, combined, or deleted.
In the description of the present application, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate description of the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.
The terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.
In the description of the present specification, a particular feature, structure, material, or characteristic may be combined in any suitable manner in one or more embodiments or examples.
It should be understood that, although the steps in the flowcharts of the figures are shown in order as indicated by the arrows, these steps are not necessarily performed in order as indicated by the arrows. The steps are not strictly limited in order and may be performed in other orders, unless explicitly stated herein. Moreover, at least some of the steps in the flowcharts of the figures may include a plurality of sub-steps or stages that are not necessarily performed at the same time, but may be performed at different times, the order of their execution not necessarily being sequential, but may be performed in turn or alternately with other steps or at least a portion of the other steps or stages.
The foregoing is only a partial embodiment of the present application, and it should be noted that, for a person skilled in the art, several improvements and modifications can be made without departing from the principle of the present application, and these improvements and modifications should also be considered as the protection scope of the present application.

Claims (10)

1. A pixel driving unit, comprising:
the first level signal end is used for receiving a discharge driving signal in a discharge mode;
the discharge control module is electrically connected with the first level signal end and is used for conducting the first level signal end with the control end of the pixel circuit in the display area in a discharge mode;
the heating control module is electrically connected with the first level signal end and is used for conducting the first level signal end and the heating resistor of the display area in a discharging mode;
the discharge control module is used for conducting the first level signal end with the control end of the pixel circuit in the display area, and simultaneously, the heating control module is used for conducting the first level signal end with the heating resistor of the display area, and the heating resistor starts to work and heats the liquid crystal layer so as to accelerate the electrostatic discharge speed of the display area.
2. The pixel driving unit according to claim 1, further comprising: a second level signal terminal; the second level signal end is used for receiving a heating control signal;
the heating control module includes: the first input end, the first output end and the first control end; the first input end is electrically connected with the first level signal end; the first output end is used for electrically connecting the heating resistor of the display area; the first control end is electrically connected with the second level signal end and is used for conducting the first input end with the first output end under the control of the heating control signal.
3. The pixel driving unit according to claim 1, wherein the heating control module comprises: the first input end, the first output end and the first control end;
the first input end is electrically connected with the first level signal end;
the first output end is used for electrically connecting the heating resistor of the display area;
the first control end is also electrically connected with the first level signal end and is used for conducting the first input end with the first output end under the control of a first level signal.
4. A pixel driving unit according to any one of claims 1-3, further comprising: a third level signal terminal; the third level signal end is used for receiving a discharge control signal in a discharge mode;
the discharge control module includes: the second input end, the second output end and the second control end; the second input end is electrically connected with the first level signal end; the second output end is used for being electrically connected with the control end of the pixel circuit in the display area; the second control end is electrically connected with the discharge control signal input end and is used for conducting the second input end with the second output end under the control of the discharge control signal.
5. A pixel driving circuit, comprising: a pixel drive unit according to any one of claims 1-4.
6. The pixel driving circuit according to claim 5, wherein the pixel driving unit comprises at least two groups;
the second level signal end in the nth pixel driving unit is electrically connected with the output end of the heating control module in the (n-1) th pixel driving unit; n is a positive integer greater than 1.
7. A display panel, comprising: pixel circuit and heating resistor, respectively, in a display area, and a pixel driving circuit according to any of the preceding claims 5-6;
the discharge control module in the pixel driving circuit is electrically connected with the control end of the pixel circuit;
and a heating control module in the pixel driving circuit is electrically connected with the heating resistor.
8. A detection apparatus, characterized by comprising:
a controller for transmitting a discharge driving signal to the first level signal terminal of the pixel driving circuit in the display panel according to claim 7 in a discharge mode, controlling the discharge control module in the pixel driving circuit to conduct the first level signal terminal with the control terminal of the pixel circuit in the display area, controlling the heating control module in the pixel driving circuit to conduct the first level signal terminal with the heating resistor of the display area, and then generating a ground control signal;
The discharger comprises a third input end, a third output end and a third control end; the third input end is used for being electrically connected with the pixel circuit of the display panel; the third output end is used for being grounded; the third control end is electrically connected with the controller and is used for conducting the third input end with the third output end under the control of the grounding control signal.
9. A control method based on the detection device of claim 8, comprising:
in a first period, a controller in the detection device sends a discharge driving signal to a first level signal end of a pixel driving circuit in a display panel, controls a discharge control module in the pixel driving circuit to conduct the first level signal end with a control end of the pixel circuit in a display area, and controls a heating control module in the pixel driving circuit to conduct the first level signal end with a heating resistor of the display area.
10. The control method according to claim 9, characterized in that the control method further comprises:
in a second period after the first period, the controller stops sending a discharge driving signal to a first level signal end of a pixel driving circuit in the display panel, controls the discharge control module to keep the first level signal end conductive to a control end of a pixel circuit in the display area, and controls the heating control module to keep the first level signal end conductive to a heating resistor of the display area;
In a third period after the second period, the controller controls the discharge control module to disconnect the first level signal end from a control end of a pixel circuit in a display area, and controls the heating control module to disconnect the first level signal end from a heating resistor of the display area;
and in a fourth period after the third period, the controller generates a grounding control signal, and a discharger in the detection device conducts the third input end and the third output end according to the grounding control signal received by the third control end.
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08146373A (en) * 1994-11-24 1996-06-07 Sony Corp Production of liquid crystal display panel
CN101542372A (en) * 2007-02-19 2009-09-23 东芝松下显示技术有限公司 Strip-shaped base metal for liquid cell, multi-face chamfered base material for liquid cell, substrate for array substrate, and liquid cell manufacturing method
CN110262107A (en) * 2019-06-25 2019-09-20 京东方科技集团股份有限公司 The antistatic of display panel, display device and display panel remains method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08146373A (en) * 1994-11-24 1996-06-07 Sony Corp Production of liquid crystal display panel
CN101542372A (en) * 2007-02-19 2009-09-23 东芝松下显示技术有限公司 Strip-shaped base metal for liquid cell, multi-face chamfered base material for liquid cell, substrate for array substrate, and liquid cell manufacturing method
CN110262107A (en) * 2019-06-25 2019-09-20 京东方科技集团股份有限公司 The antistatic of display panel, display device and display panel remains method

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