CN115424593B - Data driving circuit, display module and display device - Google Patents
Data driving circuit, display module and display device Download PDFInfo
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- CN115424593B CN115424593B CN202211123435.6A CN202211123435A CN115424593B CN 115424593 B CN115424593 B CN 115424593B CN 202211123435 A CN202211123435 A CN 202211123435A CN 115424593 B CN115424593 B CN 115424593B
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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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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/045—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage adapted to a particular application and not provided for elsewhere
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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
- G09G2330/04—Display protection
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- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The embodiment of the application discloses a data driving circuit which comprises a data processing unit, a signal input end, an electrostatic protection unit and a control unit, wherein the data processing unit is connected with the signal input end through a plurality of signal transmission lines to receive an original data signal and adjust the original data signal into a data signal for executing image display. The static protection unit is connected with the plurality of signal transmission lines, and the control unit is connected with the static protection unit and the plurality of signal transmission lines. The control unit is used for selectively controlling the signal transmission lines at preset positions to be electrically connected and conducted with the electrostatic protection unit, and the electrostatic protection unit is used for performing electrostatic protection on the plurality of signal transmission lines. The static protection unit selectively performs static protection on the plurality of signal transmission lines, effectively reduces the arrangement of static protection elements in the static protection unit, and provides a larger layout space for functional circuits in the data driving circuit. The embodiment of the application also discloses a display module and a display device comprising the data driving circuit.
Description
Technical Field
The present application relates to the field of display technologies, and in particular, to a data driving circuit, a display module, and a display device.
Background
With the development of the display technology field, a display panel with a narrow frame and high resolution is a current mainstream development direction. However, due to the design of pursuing the narrow frame, the space for the arrangement of the lines for signal transmission is more limited, the interval distance between the conductive lines for multi-type signal transmission is small, and the charge transfer is easy to be caused when the signal lines with different electrostatic potentials are adjacently arranged, so that electrostatic discharge is formed, and when the data driving circuit drives the pixel unit to display images, the data driving circuit is damaged if the electrostatic discharge electrode appears.
Currently, for the electrostatic protection of the data driving circuit, one electrostatic protection element is generally disposed for each signal transmission line of the data driving circuit, but one electrostatic protection element is disposed for each signal transmission line so that a space occupied by the electrostatic protection element is large, thereby limiting the development space of the narrow frame display panel.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, the present application provides a data driving circuit with better electrostatic protection effect and small space occupation, and a display module and a display device including the data driving circuit.
A data driving circuit includes a data processing unit and a signal input terminal, the data processing unit is connected with the signal input terminal via a plurality of signal transmission lines and receives an original data signal from the signal input terminal, and the data processing unit adjusts the original data signal into a data signal for performing image display. The data driving circuit further comprises an electrostatic protection unit and a control unit, wherein the electrostatic protection unit is connected with the plurality of signal transmission lines, and the control unit is connected with the electrostatic protection unit and the plurality of signal transmission lines. The control unit is used for selectively controlling the signal transmission lines at the preset positions to be electrically connected and conducted with the static protection unit, and the static protection unit is used for performing static protection on the plurality of signal transmission lines when the data processing unit receives original data signals from the plurality of signal transmission lines.
Optionally, the data driving circuit further includes a detection unit, the detection unit is connected with the control unit and the plurality of signal input ends, and is used for detecting the instantaneous high voltage in the plurality of signal transmission lines and correspondingly outputting a detection signal to the control unit, and the control unit controls the signal transmission line at the preset position to be electrically connected and conducted with the electrostatic protection unit according to the detection signal.
Optionally, the control unit includes a control module and a plurality of static protection switches, and the control module is connected in a plurality of static protection switches through first control end, and a plurality of static protection switches are connected between a plurality of signal transmission lines and the static protection unit in correspondence. The control module receives the detection signal through the first receiving end and controls the plurality of electrostatic protection switches to be switched on and off according to the detection signal, when the electrostatic protection switches are switched on, the electrostatic protection units are electrically connected with the plurality of signal transmission lines and are switched on, and when the electrostatic protection switches are switched off, the electrostatic protection units are electrically disconnected with the plurality of signal transmission lines.
Optionally, the control unit further includes a plurality of data control switches, the control module is connected to the plurality of data control switches through the second control end, the plurality of data control switches are correspondingly arranged in a plurality of signal transmission lines, and the plurality of signal transmission lines are respectively connected to the data processing unit through the plurality of data control switches. The control module controls the on and off of the plurality of data control switches according to the detection signals, when the data control switches are on, the data processing unit is electrically connected with the plurality of signal transmission lines and is on, and when the data control switches are off, the data processing unit is electrically disconnected with the plurality of signal transmission lines.
Optionally, the control module controls the electrostatic protection switch at the preset position to be turned on according to the detection signal, and controls the corresponding data control switch in the signal transmission line electrically connected and turned on with the electrostatic protection unit to be turned on after the preset time period, so as to control the data processing unit to receive the original data signal from the signal transmission line.
Optionally, the control module controls the electrostatic protection switch at a preset position to be turned on according to the detection signal, and controls the plurality of data control switches to be turned on after a preset time length so as to control the data processing unit to receive the original data signal from the signal transmission line.
Optionally, the electrostatic protection unit includes a plurality of electrostatic protection elements, wherein one electrostatic protection switch is correspondingly connected with one signal transmission line, and each electrostatic protection element is connected with at least two signal transmission lines through the electrostatic protection switch.
Optionally, the control module controls one of the electrostatic protection switches correspondingly connected with the electrostatic protection element to be turned on according to the detection signal.
The display module comprises a display control circuit, a scanning drive circuit, a display panel and the data drive circuit, wherein the display control circuit receives an original image signal according to an external signal source, outputs a source control signal and an original data signal to the data drive circuit, outputs a grid control signal to the scanning drive circuit, and the data drive circuit outputs a data signal according to the source control signal and the original data signal and cooperates with the scanning drive circuit to output a scanning signal according to the grid control signal so as to control the display panel to display images.
A display device comprises a power supply module, a supporting frame and the display module, wherein the power supply module is used for providing power supply voltage for image display of the display module, and the supporting frame is used for fixing the power supply module and the display module.
Compared with the prior art, the signal transmission line and the static protection unit at the preset position are selectively controlled to be conducted, the static protection can be performed on the signal transmission line in a targeted manner, the accuracy of static protection on the signal transmission line is effectively improved, the static protection unit is used for selectively protecting a plurality of signal transmission lines, the setting of the static protection element is reduced, the cost is saved, the occupied space of the static protection element is reduced, a larger layout space is provided for the functional circuit inside the data driving circuit, and a larger design space is provided for the reduction of the whole volume of the data driving circuit.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a display device according to a first embodiment of the present application;
fig. 2 is a schematic side view of a display module according to a second embodiment of the application;
FIG. 3 is a schematic plan view of the display module 10 of FIG. 2;
FIG. 4 is a block diagram of a data driving circuit according to a third embodiment of the present application;
fig. 5 is an equivalent circuit diagram of the electrostatic protection unit in fig. 4.
Reference numerals illustrate: the display device comprises a display device 100, a display module 10, a power module 20, a support frame 30, a Data driving circuit 11, a scanning driving circuit 12, a display panel 13, an array substrate 131, a liquid crystal layer 132, a color film substrate 133, a pixel unit 15, a display area 13a, a display control circuit 14, a first direction F1, a second direction F2, scanning lines G1-Gn, data lines S1-Sm, data signals Data, clock signals CLK, horizontal synchronization signals Hsyn, vertical synchronization signals Vsyn, a grid control signal Cg, a source control signal Cs, a Data processing unit 111, a signal input end 112, an electrostatic protection unit 113, a control unit 114, a control module 114A, a detection unit 115 the Data transmission circuit comprises an electrostatic protection switch-K1, a Data control switch-K2, a first control end-C1, a second control end C2, a first receiving end-R1, a signal transmission line-L, a first line L1, a second line L2, a third line L3, a fourth line L4, a fifth line L5, a sixth line L6, a first electrostatic protection switch-K11, a second electrostatic protection switch-K12, a third electrostatic protection switch-K13, a fourth electrostatic protection switch-K14, a fifth electrostatic protection switch-K15, a sixth electrostatic protection switch-K16, a first Data control switch-K21, a second Data control switch-K22, a third Data control switch-K23, a fourth Data control switch-K24, a fifth Data control switch-K25, sixth data control switch-K26, electrostatic protection component-T.
Detailed Description
In order that the application may be readily understood, a more complete description of the application will be rendered by reference to the appended drawings. The drawings illustrate preferred embodiments of the application. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
The following description of the embodiments refers to the accompanying drawings, which illustrate specific embodiments in which the application may be practiced. The numbering of the components itself, e.g. "first", "second", etc., is used herein merely to distinguish between the described objects and does not have any sequential or technical meaning. The term "coupled" as used herein includes both direct and indirect coupling (coupling), unless otherwise indicated. Directional terms, such as "upper", "lower", "front", "rear", "left", "right", "inner", "outer", "side", etc., in the present application are merely referring to the directions of the attached drawings, and thus, directional terms are used for better, more clear explanation and understanding of the present application, rather than indicating or implying that the apparatus or element being referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present application.
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; may be a mechanical connection; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art. It should be noted that the terms "first," "second," and the like in the description and the claims of the present application and in the drawings are used for distinguishing between different objects and not for describing a particular sequential order.
Furthermore, the terms "comprises," "comprising," "includes," "including," or "having," when used in this specification, are intended to specify the presence of stated features, operations, elements, etc., but do not limit the presence of one or more other features, operations, elements, etc., but are not limited to other features, operations, elements, etc. Furthermore, the terms "comprises" or "comprising" mean that there is a corresponding feature, number, step, operation, element, component, or combination thereof disclosed in the specification, and that there is no intention to exclude the presence or addition of one or more other features, numbers, steps, operations, elements, components, or combinations thereof. Furthermore, when describing embodiments of the application, use of "may" means "one or more embodiments of the application. Also, the term "exemplary" is intended to refer to an example or illustration.
Unless defined otherwise, all 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. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a display device 100 according to a first embodiment of the application. The display device 100 includes a display module 10, a power module 20 and a supporting frame 30, wherein the display module 10 and the power module 20 are fixed on the supporting frame 30, and the power module 20 is disposed on a back surface of the display module 10, i.e. a non-display surface. The power module 20 is used for providing power voltage for the display module 10 to display images, and the support frame 30 provides fixing and protecting functions for the display module 10 and the power module 20.
Referring to fig. 2, fig. 2 is a schematic side view of a display module according to a second embodiment of the application.
As shown in fig. 2, the display module 10 includes a display panel 13 and a backlight module 17 (Back light Module, BM), wherein the backlight module 17 is configured to provide display light to the display panel 13, and the display panel 13 emits corresponding light according to an image signal to be displayed to perform image display.
In the exemplary embodiment, the display panel 13 may be a liquid crystal display panel, or may be another type of display panel, and the present application is not limited thereto.
Taking a liquid crystal display panel AS an example, the display panel 13 includes an Array Substrate (AS) 131, a color film substrate (Color film substrate, CF) 133, and a liquid crystal layer 132 interposed between the Array substrate 131 and the color film substrate 133. The array substrate 131 and the color film substrate 133 are provided with driving elements, and the driving elements generate corresponding electric fields according to the Data signals Data, so that the liquid crystal molecules in the liquid crystal layer 132 are driven to deflect at a preset angle to emit light rays with corresponding brightness, and further image display is performed.
Referring to fig. 3, fig. 3 is a schematic plan layout of the display module 10 in fig. 2.
As shown in fig. 3, the display module 10 further includes a data driving circuit 11, a scan driving circuit 12, and a display control circuit 14.
A plurality of scanning lines (Gate lines) G1 to Gn extending in the first direction F1 and a plurality of data lines (Source lines) S1 to Sm extending in the second direction F2 are disposed in a grid shape inside the display panel 13. Wherein the first direction F1 and the second direction F2 are perpendicular to each other. The pixel units 15 are provided at intersections of the plurality of scanning lines G1 to Gn and the data lines S1 to Sm. In the present embodiment, the pixel units 15 at different positions can be represented as P11 to P1m, P21 to P2m, … …, pn1 to Pnm, respectively.
The scan lines G1 to Gn are connected to the scan driving circuit 12, receive scan signals from the scan driving circuit 12, and the Data lines S1 to Sm are connected to the Data driving circuit 11, for receiving image signals or Data signals (Data) supplied from the Data driving circuit 11 and held and transmitted in the form of gray scale values and converting them into corresponding analog voltage values.
The pixel unit 15 receives the Data voltages corresponding to the gray scale values in the Data signals Data provided by the Data lines S1 to Sm in a predetermined period under the control of the scan lines G1 to Gn, and drives the liquid crystal layer 132 to deflect corresponding angles accordingly, so that the received backlight emits light rays with corresponding brightness according to the deflected corresponding angles, and the light rays with corresponding brightness according to the image signals are emitted for image display.
The display control circuit 14 receives image Data, a clock signal CLK for synchronization, a horizontal synchronization signal Hsyn, and a vertical synchronization signal Vsyn from an external signal source of the display module 10, and outputs a gate output control signal Cg for controlling the scan driving circuit 12, a source output control signal Cs for controlling the Data driving circuit 11, and an adjustment Data signal Data representing image information. In the present embodiment, the display control circuit 14 performs data adjustment processing on the image data to obtain an original data signal, and transmits the original data signal to the data driving circuit 11.
The scan driving circuit 12 receives the gate output control signal Cg output from the display control circuit 14, and outputs scan signals to the respective scan lines G1 to Gn. The Data driving circuit 11 receives the source output control signal Cs and the original Data signal outputted from the display control circuit 14, adjusts the original Data signal according to the source output control signal Cs to obtain a Data signal Data, and outputs the Data signal Data to the driving element in each pixel unit 15 through the Data lines S1 to Sm to execute an image. The Data signal Data supplied to the display panel 13 is a gray scale voltage in analog form. The scanning signal outputted from the scanning driving circuit 12 is matched with the Data signal Data outputted from the Data driving circuit 11, and a voltage corresponding to the Data signal Data for driving is applied to the driving element in the pixel unit 15 to drive the liquid crystal molecules to perform image display.
Referring to fig. 4, fig. 4 is a block diagram of a data driving circuit according to a third embodiment of the application. As shown in fig. 4, the data driving circuit 11 includes a data processing unit 111 and a signal input terminal 112, the data processing unit 111 is connected to the signal input terminal 112 via a plurality of signal transmission lines L, and receives an original data signal from the signal input terminal 112, and the data processing unit 111 outputs a data signal for adjusting the original data signal to perform image display to the pixel unit 15 (fig. 3) to control the pixel unit 15 to perform image display.
The data driving circuit 11 further includes an electrostatic protection unit 113 and a control unit 114, wherein the electrostatic protection unit 113 is connected to the plurality of signal transmission lines L, the control unit 114 is connected to the electrostatic protection unit 113 and the plurality of signal transmission lines L, and is configured to selectively control the signal transmission lines L at a predetermined position to be electrically connected to and electrically connected to the electrostatic protection unit 113, and the electrostatic protection unit 113 is configured to perform electrostatic protection on the plurality of signal transmission lines when the data processing unit 111 receives the original data signals from the plurality of signal transmission lines L.
The control unit 114 includes a control module 114A, a plurality of electrostatic protection switches K1, and a plurality of data control switches K2, where the control module 114A is connected to the plurality of electrostatic protection switches K1 through a first control end C1, and is connected to the plurality of data control switches K2 through a second control end C2, for controlling on and off of the plurality of electrostatic protection switches K1 and the plurality of data control switches K2.
The plurality of electrostatic protection switches K1 are correspondingly connected between the electrostatic protection unit 113 and the plurality of signal transmission lines L, that is, the electrostatic protection unit 113 is respectively connected with the plurality of signal transmission lines L through the plurality of electrostatic protection switches K1, and is used for conducting with the signal transmission lines L selectively under the control of the plurality of electrostatic protection switches K1, so as to perform electrostatic protection on the signal transmission lines L conducted through the electrostatic protection switches K1. Specifically, when the electrostatic protection switch K1 is turned on, the electrostatic protection unit 113 is electrically connected to and turned on with the plurality of signal transmission lines L to control the electrostatic protection unit 113 to perform electrostatic protection on the signal transmission lines L, and when the electrostatic protection unit 113 is turned off, the electrostatic protection unit 113 is electrically disconnected from the plurality of signal transmission lines L to control the electrostatic protection unit 113 to stop performing electrostatic protection on the currently connected signal transmission lines L.
The plurality of data control switches K2 are respectively disposed in the plurality of signal transmission lines L, the plurality of signal transmission lines L are connected to the data processing unit 111 through the plurality of data control switches K2, and when the data control switch K2 at the preset position is turned on, the original data signal is transmitted to the data processing unit 111 through the turned-on signal transmission line L. Specifically, when the data control switch K2 is turned on, the data processing unit 111 is electrically connected to the plurality of signal transmission lines L to control the data processing unit 111 to receive the original data signal in the signal transmission lines L. When the data control switch K2 is turned off, the data processing unit 111 is electrically disconnected from the plurality of signal transmission lines L to control the data processing unit to stop receiving the original data signal in the signal transmission lines L.
For example, the signal input end 112 is provided with 6 signal transmission lines L, which are a first line L1, a second line L2, a third line L3, a fourth line L4, a fifth line L5, and a sixth line L6, and the control unit 114 correspondingly includes six electrostatic protection switches K1 and six data control switches K2, where the six electrostatic protection switches K1 are a first electrostatic protection switch K11, a second electrostatic protection switch K12, a third electrostatic protection switch K13, a fourth electrostatic protection switch K14, a fifth electrostatic protection switch K15, and a sixth electrostatic protection switch K16, respectively. The six data control switches are a first data control switch K21, a second data control switch K22, a third data control switch K23, a fourth data control switch K24, a fifth data control switch K25 and a sixth data control switch K26, respectively.
The electrostatic protection unit 113 is connected to the first line L1 through the first electrostatic protection switch K11, connected to the second line L2 through the second electrostatic protection switch K12, connected to the third line L3 through the third electrostatic protection switch K13, connected to the fourth line L4 through the fourth electrostatic protection switch K14, connected to the fifth line L5 through the fifth electrostatic protection switch K15, and connected to the sixth line L6 through the sixth electrostatic protection switch K16. When the control module 114A controls one or more of the electrostatic protection switches to be turned on, the electrostatic protection unit 113 performs electrostatic protection on the turned-on signal transmission line L.
The first line L1 is connected to the data processing unit 111 through the first data control switch K21, the second line L2 is connected to the data processing unit 111 through the second data control switch K22, the third line L3 is connected to the data processing unit 111 through the third data control switch K23, the fourth line L4 is connected to the data processing unit 111 through the fourth data control switch K24, the fifth line L5 is connected to the data processing unit 111 through the first data control switch K25, and the sixth line L6 is connected to the data processing unit 111 through the sixth data control switch K26. When the control module 114A controls one or more of the data control switches to be turned on, the original data signal is transmitted to the data processing unit 111 through the turned-on signal transmission line L.
The control module 114A has a delay control mechanism, and the control module 114A controls the electrostatic protection switch K1 at a preset position to be turned on and controls the corresponding data control switch K2 in the signal transmission line L electrically connected and turned on to the electrostatic protection unit 113 to be turned on after a preset period of time, so as to control the data processing unit 111 to receive an original data signal from the signal transmission line L. Or the control module 114A controls the electrostatic protection switch K1 at the preset position to be turned on according to the detection signal, and controls the data control switches K2 to be turned on after the preset time period, so as to control the data processing unit 111 to receive the original data signal from the signal transmission line L.
The data driving circuit 11 further includes a detecting unit 115, where the detecting unit 115 is connected to the plurality of signal input ends 112 of the plurality of signal transmission lines and the control module 114A, and is configured to detect an instantaneous high voltage of the plurality of signal transmission lines L from the detecting signal input end 112, that is, detect static electricity in the plurality of signal transmission lines L, and when the detecting unit 115 detects that the instantaneous voltage in one or more of the plurality of signal transmission lines is higher than a preset threshold voltage, the detecting unit 115 outputs a detecting signal to the control module 114A in the control unit 114, and the control module 114A controls the electrostatic protection switch K1 corresponding to the signal transmission line L with the detected instantaneous high voltage to be electrically connected to the electrostatic protection unit 113 according to the received detecting signal, so that the detecting unit 115 detects that the signal transmission line L with the instantaneous high voltage is conductive to perform electrostatic protection on the signal transmission line L with the instantaneous voltage.
The control module 114A controls the conduction of the corresponding data control switch K2 in the signal transmission line L electrically connected and conducted with the electrostatic protection unit 113 according to the detection signal after controlling the conduction of the corresponding electrostatic protection switch K1 for a preset period of time, so as to control the data processing unit 111 to receive the original data signal from the signal transmission line after being conducted. By receiving the original data signal from the signal transmission line L to be subjected to electrostatic protection, electrostatic protection can be effectively performed when the original data signal is received by the data processing unit 111.
Or the control module 114A controls the conduction of all the data control switches K2 after controlling the conduction of the corresponding electrostatic protection switches K1 for a preset time interval according to the detection signal, so as to control the data processing unit 111 to receive the original data signals from all the signal transmission lines L. By conducting the signal transmission line L with the detected static electricity with the static electricity protection unit 113, the static electricity in the signal transmission line L is effectively eliminated by the static electricity protection unit 113, and thus the interference when the data processing unit 111 receives the original data signal is effectively eliminated.
For example, when the detection unit 115 detects that the first line L1 and the third line L3 have an instantaneous high voltage, that is, when the detection unit 115 detects that the instantaneous high voltage pulse in the first line L1 and the third line L3 is greater than or equal to a preset threshold voltage, the detection unit 115 outputs a detection signal to the control module 114A, and the control module 114A controls the first electrostatic protection switch K11 and the third electrostatic protection switch K13 to be turned on according to the received detection signal, so that the first line L1 and the third line L3 are respectively turned on with the electrostatic protection unit 113, so that the electrostatic protection unit 113 can be used to perform electrostatic protection on the first line L1 and the third line L3, and meanwhile, after the first electrostatic protection switch K11 and the third electrostatic protection switch K13 are turned on, the control module 114A can control the first data control switch K21 and the third data control switch K23 corresponding to the third line L3 to be turned on, and can also control the first data control switch K21 to the sixth data control switch K26 to be turned on, so that the signal transmission unit 111 and the processing unit 111 can process the signal transmission line 111 to transmit the original data.
Referring to fig. 5, fig. 5 is an equivalent circuit diagram of the electrostatic protection unit 113 in fig. 4.
As shown in fig. 5, the electrostatic protection unit 113 includes a plurality of electrostatic protection elements T, each of which is connected to at least two signal transmission lines L, wherein one electrostatic protection switch K is correspondingly connected to one signal transmission line L. The control module 114A controls one of the electrostatic protection switches K correspondingly connected to the electrostatic protection element T to be turned on according to the detection signal.
When the control module 114A receives the detection signal from the first receiving end R1 and controls the corresponding electrostatic protection switch K to be turned on according to the detection signal, the detection unit 115 is characterized in that the corresponding signal transmission line L has an instantaneous high voltage exceeding a preset threshold voltage, and the control module 114A is enabled to be turned on with the electrostatic protection element T corresponding to the signal transmission line L detected by the detection unit 115 and having the electrostatic protection element T, so that the electrostatic protection switch K between the signal transmission line L and the electrostatic protection element T, in which the detection unit 115 does not detect the electrostatic, is in a turned-off state, thereby being capable of performing targeted electrostatic protection on the signal transmission line L detected with the electrostatic.
For example, when the detecting unit 115 detects that the first line L1, the fourth line L4, and the fifth line L5 in the plurality of signal transmission lines L have a transient high voltage exceeding a preset threshold voltage, the detecting unit 115 transmits a detection signal to the control module 114A, and the control module 114A controls the first electrostatic protection switch K11, the fourth electrostatic protection switch K14, and the fifth electrostatic protection switch K15 connected to the first line L1 through the first control terminal C1 according to the detection signal, so that the first line L1 is connected to the first electrostatic protection element T1 through the first electrostatic protection switch K11, the fourth line L4 is connected to the second electrostatic protection element T2 through the fourth electrostatic protection switch K14, and the fifth line L5 is connected to the third electrostatic protection element T3 through the fifth electrostatic protection switch K15, so that the electrostatic protection unit 113 performs electrostatic protection on the first line L1, the fourth line L4, and the fifth line L5, and the electrostatic protection switch T corresponding to the signal transmission lines L not detecting the signal exceeding the preset threshold voltage remain in the off state.
After the corresponding electrostatic protection switch K1 is turned on and the preset time interval, the control module 114A controls the data control switch K2 in the signal transmission line L turned on with the electrostatic protection unit 113 to be turned on through the second control terminal C2, so that the data processing unit 111 receives the original data signal from the signal transmission line L turned on with the electrostatic protection unit 113.
Or, after the corresponding electrostatic protection switch K1 is turned on for a preset period of time, the control module 114A controls the data control switches K2 in all the signal transmission lines L to be turned on through the second control terminal C2, so that the data processing unit 111 receives the original data signals from all the signal transmission lines L.
Through selective signal transmission line L execution static protection, can effectively promote data drive circuit's static protection effect, the static protection unit includes a plurality of static protection components simultaneously, need not to set up static protection component one-to-one in every signal transmission line, can effectively control static protection component's arrangement, promotes spatial layout's flexibility.
The electrostatic protection element may be a transient diode Transient Voltage Suppressor, TVS, or other electrostatic protection elements, which is not limited in the present application.
The signal transmission line and the static protection unit at the preset position are selectively controlled to be conducted, the static protection can be conducted on the signal transmission line in a targeted mode, the static protection accuracy of the signal transmission line is effectively improved, the static protection unit is used for selectively protecting a plurality of signal transmission lines L, the setting of the static protection element is reduced, the cost is saved, meanwhile, the space occupation of the static protection element is reduced, a larger layout space is provided for the functional circuit inside the data driving circuit, and a larger design space is provided for the reduction of the whole volume of the data driving circuit.
It is to be understood that the application is not limited in its application to the examples described above, but is capable of modification and variation in light of the above teachings by those skilled in the art, and that all such modifications and variations are intended to be included within the scope of the appended claims.
Claims (7)
1. A data driving circuit includes a data processing unit and a signal input terminal, the data processing unit is connected with the signal input terminal via a plurality of signal transmission lines and receives an original data signal from the signal input terminal, the data processing unit adjusts the original data signal to a data signal for performing image display,
the data driving circuit is characterized by further comprising a detection unit, an electrostatic protection unit and a control unit, wherein the detection unit is connected with the control unit and a plurality of signal input ends and is used for detecting instantaneous high voltages in a plurality of signal transmission lines and correspondingly outputting detection signals to the control unit, and the control unit is connected with the electrostatic protection unit and the plurality of signal transmission lines and is used for controlling the signal transmission lines at preset positions to be electrically connected and conducted with the electrostatic protection unit according to the detection signals;
the static electricity protection unit is connected with the plurality of signal transmission lines and is used for performing static electricity protection on the plurality of signal transmission lines when the data processing unit receives the original data signals from the plurality of signal transmission lines;
the control unit comprises a control module, a plurality of static protection switches and a plurality of data control switches, wherein the control module is connected with the static protection switches through a first control end, the static protection switches are correspondingly connected between the signal transmission lines and the static protection units, and the control module receives the detection signals through a first receiving end and controls the static protection switches to be turned on and off according to the detection signals;
the control module is connected to the plurality of data control switches through a second control end, the plurality of data control switches are correspondingly arranged in the plurality of signal transmission lines, the plurality of signal transmission lines are respectively connected to the data processing unit through the plurality of data control switches, and the control module controls the plurality of data control switches to be turned on and turned off according to the detection signals.
2. The data driving circuit according to claim 1, wherein the control module controls the electrostatic protection switch at a preset position to be turned on according to the detection signal and controls the corresponding data control switch in the signal transmission line electrically connected and turned on to be turned on after a preset period of time, so as to control the data processing unit to receive the original data signal from the signal transmission line.
3. The data driving circuit according to claim 2, wherein the control module controls the electrostatic protection switch at a preset position to be turned on according to the detection signal, and controls the plurality of data control switches to be turned on after a preset period of time, so as to control the data processing unit to receive the original data signal from the signal transmission line.
4. A data driving circuit according to any one of claims 2 to 3, wherein the electrostatic protection unit includes a plurality of electrostatic protection elements, wherein one of the electrostatic protection switches is connected to one of the signal transmission lines, and each of the electrostatic protection elements is connected to at least two of the signal transmission lines via the electrostatic protection switch.
5. The data driving circuit according to claim 4, wherein the control module controls one of the electrostatic protection switches correspondingly connected to the electrostatic protection element to be turned on according to the detection signal.
6. A display module, comprising a display control circuit, a scan driving circuit, a display panel and a data driving circuit according to any one of claims 1 to 5, wherein the display control circuit receives an original image signal according to an external signal source, outputs a source control signal and an original data signal to the data driving circuit, and outputs a gate control signal to the scan driving circuit, and the data driving circuit outputs a data signal according to the source control signal and the original data signal and cooperates with the scan driving circuit to output a scan signal according to the gate control signal to control the display panel to display an image.
7. A display device, comprising a power module, a support frame, and the display module of claim 6, wherein the power module is configured to provide a power voltage for performing image display on the display module, and the support frame is configured to fix the power module and the display module.
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| CN202211123435.6A CN115424593B (en) | 2022-09-15 | 2022-09-15 | Data driving circuit, display module and display device |
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| CN202211123435.6A CN115424593B (en) | 2022-09-15 | 2022-09-15 | Data driving circuit, display module and display device |
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| CN115424593B true CN115424593B (en) | 2023-09-19 |
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| CN115424593A (en) | 2022-12-02 |
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