CN117037651A - Display module, display device and display module driving method - Google Patents
Display module, display device and display module driving method Download PDFInfo
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- CN117037651A CN117037651A CN202311054669.4A CN202311054669A CN117037651A CN 117037651 A CN117037651 A CN 117037651A CN 202311054669 A CN202311054669 A CN 202311054669A CN 117037651 A CN117037651 A CN 117037651A
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 82
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Classifications
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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
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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
- G02F1/1306—Details
- G02F1/1309—Repairing; Testing
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
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- 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
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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
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0243—Details of the generation of driving signals
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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
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0264—Details of driving circuits
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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
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0264—Details of driving circuits
- G09G2310/0278—Details of driving circuits arranged to drive both scan and data electrodes
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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
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0264—Details of driving circuits
- G09G2310/0289—Details of voltage level shifters arranged for use in a driving circuit
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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
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/02—Details of power systems and of start or stop of display operation
Abstract
The application provides a display module, a display device and a display module driving method, and relates to the technical field of display. The display module comprises a power management module, a potential conversion module, a display panel, a switch module, a time sequence control module and a source electrode driving module. The display module is provided with the switch module, when receiving a test instruction after being electrified, the switch module of the display module is conducted so that the enabling signal input end of the potential conversion module is grounded to trigger the potential conversion module to stop working, and the reference voltage output end of the power management module outputs a direct-current voltage signal to the display panel through the switch module. When the display panels are driven by the direct-current voltage signals, a plurality of parallel capacitors between the display panels are not easy to couple with each other. The accuracy of detecting the residual direct current voltage in the display panel is high, so that a tester can accurately eliminate the residual direct current voltage in the display panel, and the display effect of the display module is improved.
Description
Technical Field
The present application relates to the field of display technologies, and in particular, to a display module, a display device, and a driving method of the display module.
Background
At present, with the continuous development of display technology, higher requirements are put forward on the reliability of the display effect of the display module, so that the display module needs to be tested before the display module leaves the factory. For example, after the display panel of the display module is turned on, a residual direct-current (DC) voltage in the display panel can be detected, and the residual DC voltage in the display panel is eliminated, so as to avoid that the residual DC voltage affects the display effect of the display panel (such as a row of black lines appear on the display panel).
Generally, the display module includes a timing control module, a potential conversion module, and a display panel, wherein the display panel includes a plurality of capacitors connected in parallel, and the intervals between the capacitors connected in parallel are smaller. The lighting mode of the display module is that the time sequence control module outputs square wave driving signals to the potential conversion module; the electric potential conversion module amplifies the square wave driving signal and outputs the amplified square wave driving signal to the display panel, and the display panel is driven to be lightened by the amplified square wave driving signal.
However, after receiving the square wave driving signal, the parallel capacitors with smaller intervals are easily coupled to each other, so that a pixel feed-in voltage is generated in the display panel. In this way, the accuracy of detecting the residual direct-current (DC) voltage in the display panel is low, and the reliability of the display effect of the display module is also low.
Disclosure of Invention
The application provides a display module, a display device and a display module driving method, which are used for solving the problem that the reliability of the display effect of the display module is low due to low accuracy of detecting the residual direct-current (DC) voltage in a display panel in the prior art.
The application provides a display module, which comprises a power management module, a potential conversion module, a display panel, a switch module, a time sequence control module and a source electrode driving module.
The time sequence control module is electrically connected with the switch module, the enabling signal input end of the potential conversion module is grounded through the switch module, the reference voltage output end of the power management module, the switch module and the display panel are sequentially electrically connected, the time sequence control module, the source electrode driving module and the display panel are sequentially electrically connected, wherein,
the time sequence control module is used for controlling the switch module to be conducted when a test instruction is received after the power-on, so that the enabling signal input end of the potential conversion module is grounded to trigger the potential conversion module to stop working, and the reference voltage output end of the power management module outputs a direct-current voltage signal to the display panel through the switch module;
the source electrode driving module is used for decoding the data to be displayed from the time sequence control module and outputting the decoded data to be displayed to the display panel;
and the display panel is used for displaying the decoded data to be displayed after being driven by the direct-current voltage signal.
In one possible embodiment, the switching module comprises a first control signal input, a second control signal input, a reference voltage input, an enable signal input and a reference voltage output,
the first control signal output end of the time sequence control module is electrically connected with the first control signal input end, the second control signal output end of the time sequence control module is electrically connected with the second control signal input end, and the time sequence control module is specifically used for controlling the switch module to be turned on based on the transmission of the first control signal to the first control signal input end and the transmission of the second control signal to the second control signal input end when a test instruction is received;
the reference voltage output end of the power management module is electrically connected with the reference voltage input end of the switch module, the enabling signal output end of the power management module is electrically connected with the enabling signal input end of the switch module, and the reference voltage output end of the switch module is electrically connected with the display panel.
In one possible embodiment, the switching module includes a first switching unit, a second switching unit, and a third switching unit, the reference voltage output terminal, the second switching unit, the first switching unit, and the first ground terminal of the power management module are electrically connected in sequence, the first switching unit is electrically connected with the first control signal output terminal, the third switching unit is electrically connected with the second control signal output terminal, the enable signal input terminal, the third switching unit, and the second ground terminal of the potential conversion module are electrically connected in sequence, the reference voltage output terminal, the second switching unit, and the drive signal input terminal of the display panel of the power management module are electrically connected in sequence,
the third switch unit is used for being conducted after receiving a second control signal from the second control signal output end so as to enable the enabling signal input end of the potential conversion module to be conducted with the second grounding end and trigger the potential conversion module to stop working;
the first switch unit is used for being conducted after receiving a first control signal from the first control signal output end;
the second switch unit is used for being triggered to be conducted when the first switch unit is conducted so as to conduct the reference voltage output end of the power management module and the driving signal input end of the display panel.
In one possible embodiment, the first switching unit comprises a first switching device and a first resistor, the second switching unit comprises a second switching device, a second resistor and a third resistor, the third switching unit comprises a third switching device, a fourth resistor and a fifth resistor, wherein,
the first resistor is connected in series between the first control signal output end and the first end of the first switching device, the second end of the first switching device is connected to the first grounding end, the reference voltage output end of the power management module, the third resistor, the second resistor and the third end of the first switching device are sequentially and electrically connected, the first end of the second switching device is electrically connected with the reference voltage output end of the power management module, the second end of the second switching device is electrically connected with the driving signal input end of the display panel, the third end of the second switching device is connected between the second resistor and the third resistor, the first control signal output end, the fifth resistor and the first end of the third switching device are sequentially and electrically connected with the second grounding end, the enabling signal output end, the fourth resistor and the third end of the third switching device are sequentially and electrically connected, and the enabling signal input end of the potential conversion module is electrically connected with the third end of the third switching device.
In one possible implementation, the first switching device is a first transistor, the second switching device is a second transistor, and the third switching device is a third transistor, wherein,
the grid electrode of the first transistor is electrically connected with the first resistor, the drain electrode of the first transistor is electrically connected with the first grounding end, the source electrode of the first transistor is electrically connected with the second resistor, the grid electrode of the second transistor is connected between the second resistor and the third resistor, the source electrode of the second transistor is electrically connected with the display panel, the drain electrode of the second transistor is respectively electrically connected with the reference voltage input end and the third resistor, the grid electrode of the third transistor is electrically connected with the fifth resistor, the source electrode of the third transistor is electrically connected with the second grounding end, and the drain electrode of the third transistor is respectively electrically connected with the fourth resistor and the enabling signal input end of the potential conversion module.
In one possible embodiment, the timing control module is electrically connected to the source driving module through a data signal line, the potential conversion module is electrically connected to the display panel through a driving signal line, and the data signal line overlaps the driving signal line.
In one possible embodiment, the timing control module is electrically connected to the source driving module through a data signal line, the potential conversion module is electrically connected to the display panel through a driving signal line, and the data signal line and the driving signal line are not overlapped.
In one possible embodiment, the display panel includes a plurality of pixel driving circuits and a plurality of pixel circuits, the driving signal output terminal of the potential conversion module is electrically connected to the plurality of pixel driving circuits, each pixel driving circuit is electrically connected to one pixel circuit, and the source driving module is electrically connected to each pixel circuit.
In one possible embodiment, the reference voltage output terminal of the power management module is electrically connected to the driving signal input terminal of the potential conversion module, the enabling signal output terminal of the power management module is electrically connected to the enabling signal input terminal of the potential conversion module, the driving signal output terminal of the potential conversion module is electrically connected to the display panel, wherein,
the time sequence control module is also used for outputting square wave driving signals to the potential conversion module when the test instruction is not received after the power-on;
the potential conversion module is also used for amplifying the square wave driving signal according to the reference voltage signal from the power management module and outputting the amplified square wave driving signal to the display panel;
the display panel is used for displaying the data to be displayed after the source electrode driving module decodes after being driven by the amplified square wave driving signal.
In one possible implementation manner, the driving signal output end of the potential conversion module and the reference voltage output end of the power management module are connected to the display panel through the same signal input line.
In a second aspect, the present application further provides a display device, including a test port, a main control board, and the display module provided in the first aspect of the present application, where the test port, the main control board, and a timing control module of the display module are electrically connected in sequence.
In a third aspect, the present application further provides a driving method of a display module, which is applied to the display module provided in the first aspect of the present application, where the method provided in the present application includes:
when the time sequence control module receives a test instruction after power-on, the switch module is controlled to be conducted so that the enabling signal input end of the potential conversion module is grounded to trigger the potential conversion module to stop working, and the reference voltage output end of the power management module outputs a direct-current voltage signal to the display panel through the switch module;
the source electrode driving module decodes the data to be displayed from the time sequence control module and outputs the decoded data to be displayed to the display panel;
after the display panel is driven by the direct-current voltage signal, the decoded data to be displayed is displayed.
The application provides a display module, a display device and a display module driving method, wherein when a time sequence control module receives a test instruction after power-on, a switch module is controlled to be conducted so that an enabling signal input end of a potential conversion module is grounded to trigger the potential conversion module to stop working, and a reference voltage output end of a power management module outputs a direct current voltage signal to a display panel through the switch module. When the display panels are driven by the direct-current voltage signals, a plurality of parallel capacitors between the display panels are not easy to couple with each other. Thus, the pixel feed-in voltage is not generated in the display panel. Therefore, the accuracy of detecting the residual direct current voltage in the display panel is high, so that a tester can accurately eliminate the residual direct current voltage in the display panel, and the display effect of the display module is improved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions of the prior art, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it will be obvious that the drawings in the following description are some embodiments of the present application, and that other drawings can be obtained according to these drawings without inventive effort to a person skilled in the art.
FIG. 1 is a block diagram of a circuit connection of a display module according to an embodiment of the present application;
FIG. 2 is a second circuit connection block diagram of a display module according to an embodiment of the present application;
FIG. 3 is a third circuit connection block diagram of a display module according to an embodiment of the present application;
FIG. 4 is a circuit connection block diagram of a display module according to an embodiment of the present application;
FIG. 5 is a fifth block diagram of a circuit connection of a display module according to an embodiment of the present application;
FIG. 6 is a schematic diagram illustrating interaction between a display device and a test terminal according to an embodiment of the present application;
fig. 7 is a flowchart of a driving method of a display module according to an embodiment of the application.
Detailed Description
Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. It should be understood that the description is only exemplary and is not intended to limit the scope of the present disclosure. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the concepts of the present disclosure.
Various structural schematic diagrams according to embodiments of the present disclosure are shown in the drawings. The figures are not drawn to scale, wherein certain details are exaggerated for clarity of presentation and may have been omitted. The shapes of the various regions, layers and relative sizes, positional relationships between them shown in the drawings are merely exemplary, may in practice deviate due to manufacturing tolerances or technical limitations, and one skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions as actually required.
In the context of the present disclosure, when a layer/element is referred to as being "on" another layer/element, it can be directly on the other layer/element or intervening layers/elements may be present therebetween. In addition, if one layer/element is located "on" another layer/element in one orientation, that layer/element may be located "under" the other layer/element when the orientation is turned.
Technical terms of the present application are introduced:
power Management module (PMIC): the semiconductor integrated circuit can control and monitor the input and output of various voltages and currents of the display module, thereby ensuring the stable and safe operation of the display module.
Timing control module (Timing Controller, TCON): for outputting square wave signals for driving the display panel.
Potential conversion module (Level shift, LS): the square wave signal is used for amplifying the square wave signal which is output by the time sequence control module and drives the display panel.
Source driver module (source IC): for decoding the data to be displayed from the timing control module.
Generally, the display module includes a timing control module, a potential conversion module, and a display panel, wherein the display panel includes a plurality of capacitors connected in parallel, and the intervals between the capacitors connected in parallel are smaller. The lighting mode of the display module is that the time sequence control module outputs square wave driving signals to the potential conversion module; the electric potential conversion module amplifies the square wave driving signal and outputs the amplified square wave driving signal to the display panel, and the display panel is driven to be lightened by the amplified square wave driving signal.
However, after receiving the square wave driving signal, the parallel capacitors with smaller intervals are easily coupled to each other, so that a pixel feed-in voltage is generated in the display panel. In this way, the accuracy of detecting the residual direct-current (DC) voltage in the display panel is low, and the reliability of the display effect of the display module is also low.
In view of the above, the present application provides a display module, a display device and a driving method of the display module, by providing a switch module in the display module.
Therefore, when the display module receives a test instruction after being electrified, the switch module of the display module is conducted so that the enabling signal input end of the potential conversion module is grounded to trigger the potential conversion module to stop working, and the reference voltage output end of the power management module outputs a direct-current voltage signal to the display panel through the switch module. When the display panels are driven by the direct-current voltage signals, a plurality of parallel capacitors between the display panels are not easy to couple with each other. Thus, the pixel feed-in voltage is not generated in the display panel. Therefore, the accuracy of detecting the residual direct current voltage in the display panel is high, so that a tester can accurately eliminate the residual direct current voltage in the display panel, and the display effect of the display module is improved.
The following describes the technical scheme of the present application and how the technical scheme of the present application solves the above technical problems in detail with specific embodiments. The following embodiments may be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments. Embodiments of the present application will be described below with reference to the accompanying drawings.
As shown in fig. 1, an embodiment of the present application provides a display module applied to a display device. The display device may be a mobile phone, a tablet computer, an intelligent television, etc., which is not limited herein. Specifically, the display module includes a power management module 101, a potential conversion module 105, a display panel 106, a switch module 104, a timing control module 102, and a source driving module 103.
The timing control module 102 is electrically connected to the switch module 104, the enable signal input end EN of the potential conversion module 105 is grounded via the switch module 104, the reference voltage output end VGH of the power management module 101, the switch module 104 and the display panel 106 are electrically connected in sequence, and the timing control module 102, the source driving module 103 and the display panel 106 are electrically connected in sequence. Wherein,
when the timing control module 102 receives a test instruction after power-up, the display module is in a test mode. In the test mode, when the timing control module 102 receives a test command after power-on, the switch module 104 is controlled to be turned on, so that the enable signal input end EN of the potential conversion module 105 is grounded to trigger the potential conversion module 105 to stop working, and the reference voltage output end VGH of the power management module 101 outputs a dc voltage signal to the display panel 106 through the switch module 104. The source driving module 103 is configured to decode the data to be displayed from the timing control module 102, and output the decoded data to be displayed to the display panel 106.
The display panel 106 is used for displaying the decoded data to be displayed after being driven by the direct-current voltage signal. Illustratively, the display panel 106 may be, but is not limited to, an LCD display panel 106. As further shown in fig. 1, the display panel 106 includes a plurality of pixel driving circuits 107 and a plurality of pixel circuits 108, the driving signal output terminal of the potential conversion module 105 is electrically connected to the plurality of pixel driving circuits 107, each pixel driving circuit 107 is electrically connected to one pixel circuit 108, and the source driving module 103 is electrically connected to each pixel circuit 108.
The display device further comprises a main control board and a test port, and the time sequence control module 102, the main control board and the time sequence control module 102 of the display module are electrically connected in sequence. The main control board may receive a test instruction from the test terminal through the test port and transmit the test instruction to the timing control module 102. Further, the timing control module 102 controls the switch module 104 to be turned on in response to the test instruction.
In addition, the reference voltage output terminal VGH of the power management module 101 is electrically connected to the driving signal input terminal of the potential conversion module 105, the enable signal output terminal VDD of the power management module 101 is electrically connected to the enable signal input terminal EN of the potential conversion module 105, and the driving signal output terminal of the potential conversion module 105 is electrically connected to the display panel 106.
Thus, when the timing control module 102 does not receive the test command after power-up, the display module is in the normal display mode. In the normal display mode, the timing control module 102 is further configured to output a square wave driving signal to the potential conversion module 105 when a test instruction is not received after power-up; the potential conversion module 105 is further configured to amplify the square wave driving signal according to the reference voltage signal from the power management module 101, and output the amplified square wave driving signal to the display panel 106. For example, the square wave drive signal before amplification is [0V,1.8V ], and the square wave drive signal after amplification is [ -10V,20V ]. The display panel 106 is configured to display the data to be displayed after the source driving module 103 decodes the data after being driven by the amplified square wave driving signal.
Alternatively, as shown in fig. 1, the driving signal output terminal of the potential conversion module 105 and the reference voltage output terminal VGH of the power management module 101 are connected to the display panel 106 via the same signal input line. Thus, the internal wiring space of the display module can be saved.
In summary, in the display module provided by the embodiment of the application, when the timing control module 102 receives the test command after powering on, the switch module 104 is controlled to be turned on, so that the enable signal input end EN of the potential conversion module 105 is grounded to trigger the potential conversion module 105 to stop working, and the reference voltage output end VGH of the power management module 101 outputs the dc voltage signal to the display panel 106 through the switch module 104. When the display panel 106 is driven by the dc voltage signal, the parallel capacitors of the display panel 106 are not easily coupled to each other. Thus, no pixel feed voltage is generated in the display panel 106. In this way, the accuracy of detecting the residual dc voltage in the display panel 106 is high, so that the tester can accurately eliminate the residual dc voltage in the display panel 106, and the display effect of the display module is improved.
Specifically, as also shown in fig. 1, the switch module 104 includes a first control signal input terminal, a second control signal input terminal, a reference voltage input terminal VGH, an enable signal input terminal EN, and a reference voltage output terminal VGH.
The first control signal output terminal GPIO1 of the timing control module 102 is electrically connected to the first control signal input terminal, and the second control signal output terminal GPIO2 of the timing control module 102 is electrically connected to the second control signal input terminal. The timing control module 102 is specifically configured to control the switch module 104 to be turned on based on transmitting a first control signal to the first control signal input terminal and transmitting a second control signal to the second control signal input terminal when receiving a test command. The reference voltage output terminal VGH of the power management module 101 is electrically connected to the reference voltage input terminal VGH of the switching module 104, the enable signal output terminal VDD of the power management module 101 is electrically connected to the enable signal input terminal of the switching module 104, and the enable signal output terminal of the switching module 104 is electrically connected to the display panel 106.
Further, as shown in fig. 2, the switching module 104 includes a first switching unit 201, a second switching unit 202, and a third switching unit 203. The reference voltage output terminal VGH, the second switch unit 202, the first switch unit 201, and the first ground terminal of the power management module 101 are electrically connected in sequence, the first switch unit 201 is electrically connected to the first control signal output terminal GPIO1, the third switch unit 203 is electrically connected to the second control signal output terminal GPIO2, the enable signal input terminal EN, the third switch unit 203, and the second ground terminal of the potential conversion module 105 are electrically connected in sequence, and the reference voltage output terminal VGH, the second switch unit 202, and the driving signal input terminal of the display panel 106 of the power management module 101 are electrically connected in sequence.
The third switch unit 203 is configured to be turned on after receiving the second control signal from the second control signal output terminal GPIO2, so that the enable signal input terminal EN of the potential conversion module 105 is turned on with the second ground terminal to trigger the potential conversion module 105 to stop working. As can be appreciated, since the enable signal input end EN of the potential conversion module 105, the third switch unit 203 and the second ground end are electrically connected in sequence, when the third switch unit 203 is turned on, the enable signal input end EN of the potential conversion module 105 is connected to the second ground end, the enable signal input end EN of the potential conversion module 105 is grounded, and thus the potential conversion module 105 is triggered to stop working.
The first switch unit 201 is configured to be turned on after receiving a first control signal from the first control signal output terminal GPIO 1. The second switch unit 202 is configured to be triggered to be turned on when the first switch unit 201 is turned on, so that the reference voltage output terminal VGH of the power management module 101 is turned on with the driving signal input terminal of the display panel 106. As can be appreciated, since the reference voltage output terminal VGH of the power management module 101, the second switch unit 202, the first switch unit 201 and the first ground terminal are electrically connected in sequence, when the first switch unit 201 is turned on, the output terminal of the second switch unit 202 is grounded, and the input terminal of the second switch unit 202 is turned on with the reference voltage output terminal VGH of the power management module 101, so that the second switch unit 202 is also turned on. Since the reference voltage output terminal VGH of the power management module 101, the second switch unit 202 and the driving signal input terminal of the display panel 106 are electrically connected in sequence, when the second switch unit 202 is turned on, the reference voltage output terminal VGH of the power management module 101 is directly electrically connected to the display panel 106.
It can be understood that the potential conversion module 105 can be accurately triggered to stop working by controlling the third switch unit 203 to be turned on, and the reference voltage output terminal VGH of the power management module 101 can be accurately triggered to be directly connected to the display panel 106 by controlling the second switch unit 202 and the third switch unit 203 to be turned on.
Further, as shown in fig. 3, the first switching unit 201 includes a first switching device 401 and a first resistor R1, the second switching unit 202 includes a second switching device 402, a second resistor R2 and a third resistor R3, and the third switching unit 203 includes a third switching device 403, a fourth resistor R4 and a fifth resistor R5. The first resistor R1 is connected in series between the first control signal output terminal GPIO1 and the first end of the first switching device 401, and the second end of the first switching device 401 is connected to the first ground terminal. The reference voltage output terminal VGH of the power management module 101, the third resistor R3, the second resistor R2, and the third terminal of the first switching device 401 are electrically connected in sequence, and the first terminal of the second switching device 402 is electrically connected to the reference voltage output terminal VGH of the power management module 101. A second terminal of the second switching device 402 is electrically connected to the driving signal input terminal of the display panel 106, and a third terminal of the second switching device 402 is connected between the second resistor R2 and the third resistor R3. The first control signal output terminal GPIO1, the fifth resistor R5, and the first end of the third switching device 403 are electrically connected in sequence, the second end of the third switching device 403 is electrically connected to the second ground, the enable signal output terminal VDD, the fourth resistor R4, and the third end of the third switching device 403 are electrically connected in sequence, and the enable signal input terminal EN of the potential conversion module 105 is electrically connected to the third end of the third switching device 403.
Illustratively, as shown in fig. 4, the first switching device 401 is a first transistor Q1, the second switching device 402 is a second transistor Q2, and the third switching device 403 is a third transistor Q3. The first transistor Q1, the second transistor Q2, and the third transistor Q3 may be, but not limited to, a transistor, a P-type transistor, or an N-type transistor, which is not limited herein. For example, the first transistor Q1 is a triode, and the second transistor Q2 and the third transistor Q3 are P-type transistors.
The gate of the first transistor Q1 is electrically connected to the first resistor R1, the drain of the first transistor Q1 is electrically connected to the first ground, the source of the first transistor Q1 is electrically connected to the second resistor R2, and the gate of the second transistor Q2 is connected between the second resistor R2 and the third resistor R3. The source of the second transistor Q2 is electrically connected to the display panel 106, the drain of the second transistor Q2 is electrically connected to the reference voltage input terminal VGH and the third resistor R3, and the gate of the third transistor Q3 is electrically connected to the fifth resistor R5. The source of the third transistor Q3 is electrically connected to the second ground, and the drain of the third transistor Q3 is electrically connected to the fourth resistor R4 and the enable signal input terminal EN of the potential conversion module 105, respectively.
As shown in fig. 1 to 4, the timing control module 102 is electrically connected to the source driving module 103 through a data signal line 110, the potential conversion module 105 is electrically connected to the display panel 106 through a driving signal line 109, and the data signal line 110 overlaps with the driving signal line 109. As can be appreciated, when the data signal line 110 overlaps with the driving signal line 109, the internal wiring space of the display module is saved, and when the display module is in the test mode, since the driving signal line 109 outputs the dc driving signal from the power management module 101, the driving signal line 109 and the data signal line 110 are not coupled, and thus the data output from the source driving module 103 based on the data signal line 110 is not distorted. Thus, when the display module is abnormal in the display data, it can be accurately determined that the source driving module 103 itself has failed.
Alternatively, as shown in fig. 5, the timing control module 102 is electrically connected to the source driving module 103 through the data signal line 110, the potential conversion module 105 is electrically connected to the display panel 106 through the driving signal line 109, and the data signal line 110 and the driving signal line 109 are not overlapped. In this way, whether the display module is in the test mode or the normal display mode, since the data signal line 110 and the driving signal line 109 are not overlapped, the data output from the source driving module 103 based on the data signal line 110 is not distorted. In this way, when the display module is abnormal in the display data, it can be determined that the source driving module 103 itself has failed.
Referring to fig. 6, the embodiment of the application further provides a display device, which may be, for example, but not limited to, a mobile phone, a tablet computer, a smart television, and the like. It should be noted that, for the sake of brevity, reference should be made to the corresponding contents of the above embodiments for the description of the embodiments of the present application, where the basic principles and technical effects of the display device provided in the embodiments of the present application are the same as those of any of the above embodiments.
The display device includes a test port 112, a main control board 111, and a display module provided in any of the foregoing embodiments, where the test port 112, the main control board 111, and a timing control module 102 of the display module are electrically connected in sequence. Wherein the test port 112 may be, but is not limited to, a USB interface.
The main control board 111 may receive a test instruction from the test terminal 113 through the test port 112 and transmit the test instruction to the timing control module 102 of the display module. Furthermore, the timing control module 102 of the display module controls the switch module 104 to be turned on in response to the test command, so that the enable signal input end EN of the potential conversion module 105 of the display module is grounded to trigger the potential conversion module 105 to stop working, and the reference voltage output end VGH of the power management module 101 outputs a dc voltage signal to the display panel 106 through the switch module 104.
Referring to fig. 7, an embodiment of the present application further provides a driving method of a display module, which is applied to the display module provided in the first aspect of the present application. It should be noted that, the basic principle and the technical effects of the driving method of the display module provided by the embodiment of the present application are the same as those of any of the above embodiments, and for brevity, reference may be made to the corresponding contents of the above embodiments for the description of the embodiment of the present application. The method provided by the embodiment of the application further comprises the following steps:
s701: when the timing control module 102 receives a test command after power-on, the switch module 104 is controlled to be turned on, so that the enable signal input end EN of the potential conversion module 105 is grounded to trigger the potential conversion module 105 to stop working, and the reference voltage output end VGH of the power management module 101 outputs a direct current voltage signal to the display panel 106 through the switch module 104.
S702: the source driving module 103 decodes the data to be displayed from the timing control module 102 and outputs the decoded data to be displayed to the display panel 106.
S703: after being driven by the dc voltage signal, the display panel 106 displays the decoded data to be displayed.
In the above description, technical details such as patterning of each layer are not described in detail. Those skilled in the art will appreciate that layers, regions, etc. of the desired shape may be formed by a variety of techniques. In addition, to form the same structure, those skilled in the art can also devise methods that are not exactly the same as those described above. In addition, although the embodiments are described above separately, this does not mean that the measures in the embodiments cannot be used advantageously in combination.
While preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present application without departing from the spirit or scope of the application. Thus, it is intended that the present application also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (12)
1. A display module, comprising: the power management module, the potential conversion module, the display panel, the switch module, the time sequence control module and the source electrode driving module are electrically connected, the enabling signal input end of the potential conversion module is grounded through the switch module, the reference voltage output end of the power management module, the switch module and the display panel are electrically connected in sequence, the time sequence control module, the source electrode driving module and the display panel are electrically connected in sequence, wherein,
the timing control module is used for controlling the switch module to be conducted when a test instruction is received after the power-on, so that the enabling signal input end of the potential conversion module is grounded to trigger the potential conversion module to stop working, and the reference voltage output end of the power management module outputs a direct-current voltage signal to the display panel through the switch module;
the source electrode driving module is used for decoding the data to be displayed from the time sequence control module and outputting the decoded data to be displayed to the display panel;
the display panel is used for displaying the decoded data to be displayed after being driven by the direct-current voltage signal.
2. The display module of claim 1, wherein the switching module comprises a first control signal input, a second control signal input, a reference voltage input, an enable signal input, and a reference voltage output,
the first control signal output end of the time sequence control module is electrically connected with the first control signal input end, the second control signal output end of the time sequence control module is electrically connected with the second control signal input end, and the time sequence control module is specifically used for controlling the switch module to be turned on based on the transmission of the first control signal to the first control signal input end and the transmission of the second control signal to the second control signal input end when a test instruction is received;
the reference voltage output end of the power management module is electrically connected with the reference voltage input end of the switch module, the enabling signal output end of the power management module is electrically connected with the enabling signal input end of the switch module, and the reference voltage output end of the switch module is electrically connected with the display panel.
3. The display module of claim 2, wherein the switching module comprises a first switching unit, a second switching unit, and a third switching unit, the reference voltage output terminal, the second switching unit, the first switching unit, and the first ground terminal of the power management module are electrically connected in sequence, the first switching unit is electrically connected to the first control signal output terminal, the third switching unit is electrically connected to the second control signal output terminal, the enable signal input terminal, the third switching unit, and the second ground terminal of the potential conversion module are electrically connected in sequence, the reference voltage output terminal, the second switching unit, and the drive signal input terminal of the display panel of the power management module are electrically connected in sequence, wherein,
the third switch unit is used for being conducted after receiving a second control signal from the second control signal output end, so that the enabling signal input end of the potential conversion module is conducted with the second grounding end to trigger the potential conversion module to stop working;
the first switch unit is used for being conducted after receiving a first control signal from the first control signal output end;
the second switch unit is used for being triggered to be conducted when the first switch unit is conducted so as to conduct the reference voltage output end of the power management module and the driving signal input end of the display panel.
4. The display module of claim 3, wherein the first switching unit comprises a first switching device and a first resistor, the second switching unit comprises a second switching device, a second resistor, and a third resistor, the third switching unit comprises a third switching device, a fourth resistor, and a fifth resistor, wherein,
the first resistor is connected in series between the first control signal output end and the first end of the first switching device, the second end of the first switching device is connected to the first grounding end, the reference voltage output end, the third resistor, the second resistor and the third end of the first switching device of the power management module are sequentially and electrically connected, the first end of the second switching device is electrically connected with the reference voltage output end of the power management module, the second end of the second switching device is electrically connected with the driving signal input end of the display panel, the third end of the second switching device is connected between the second resistor and the third resistor, the first control signal output end, the fifth resistor and the first end of the third switching device are sequentially and electrically connected, the second end of the third switching device is electrically connected with the second grounding end, the fourth resistor and the third end of the third switching device are sequentially and electrically connected, and the third end of the third switching device is electrically connected with the third end of the enabling signal input module.
5. The display module of claim 4, wherein the first switching device is a first transistor, the second switching device is a second transistor, and the third switching device is a third transistor, wherein,
the grid electrode of the first transistor is electrically connected with the first resistor, the drain electrode of the first transistor is electrically connected with the first grounding end, the source electrode of the first transistor is electrically connected with the second resistor, the grid electrode of the second transistor is connected between the second resistor and the third resistor, the source electrode of the second transistor is electrically connected with the display panel, the drain electrode of the second transistor is respectively electrically connected with the reference voltage input end and the third resistor, the grid electrode of the third transistor is electrically connected with the fifth resistor, the source electrode of the third transistor is electrically connected with the second grounding end, and the drain electrode of the third transistor is respectively electrically connected with the fourth resistor and the enabling signal input end of the potential conversion module.
6. The display module according to claim 1, wherein the timing control module is electrically connected to the source driving module through a data signal line, the potential conversion module is electrically connected to the display panel through a driving signal line, and the data signal line overlaps with the driving signal line.
7. The display module according to claim 1, wherein the timing control module is electrically connected to the source driving module through a data signal line, the potential conversion module is electrically connected to the display panel through a driving signal line, and the data signal line and the driving signal line do not overlap.
8. The display module of claim 1, wherein the display panel comprises a plurality of pixel driving circuits and a plurality of pixel circuits, the driving signal output terminal of the potential conversion module is electrically connected to the plurality of pixel driving circuits, each pixel driving circuit is electrically connected to one of the pixel circuits, and the source driving module is electrically connected to each of the pixel circuits.
9. The display module of any one of claims 1-8, wherein a reference voltage output of the power management module is electrically connected to a drive signal input of the potential conversion module, an enable signal output of the power management module is electrically connected to an enable signal input of the potential conversion module, and a drive signal output of the potential conversion module is electrically connected to the display panel,
the time sequence control module is also used for outputting a square wave driving signal to the potential conversion module when a test instruction is not received after power-on;
the potential conversion module is also used for amplifying the square wave driving signal according to the reference voltage signal from the power management module and outputting the amplified square wave driving signal to the display panel;
the display panel is used for displaying the data to be displayed after the source electrode driving module decodes after being driven by the amplified square wave driving signal.
10. The display module of claim 9, wherein the driving signal output terminal of the potential conversion module and the reference voltage output terminal of the power management module are connected to the display panel through a same signal input line.
11. The display device is characterized by comprising a test port, a main control board and the display module set according to any one of claims 1-10, wherein the test port, the main control board and a time sequence control module of the display module set are electrically connected in sequence.
12. A display module driving method, applied to the display module of any one of claims 1 to 10, comprising:
when the time sequence control module receives a test instruction after power-on, the switch module is controlled to be conducted so that the enabling signal input end of the potential conversion module is grounded to trigger the potential conversion module to stop working, and the reference voltage output end of the power management module outputs a direct-current voltage signal to the display panel through the switch module;
the source electrode driving module decodes the data to be displayed from the time sequence control module and outputs the decoded data to be displayed to the display panel;
and the display panel displays the decoded data to be displayed after being driven by the direct-current voltage signal.
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| CN202311054669.4A CN117037651A (en) | 2023-08-21 | 2023-08-21 | Display module, display device and display module driving method |
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| CN202311054669.4A CN117037651A (en) | 2023-08-21 | 2023-08-21 | Display module, display device and display module driving method |
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