CN109493781B - Driving device and display apparatus - Google Patents
Driving device and display apparatus Download PDFInfo
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- CN109493781B CN109493781B CN201811474138.XA CN201811474138A CN109493781B CN 109493781 B CN109493781 B CN 109493781B CN 201811474138 A CN201811474138 A CN 201811474138A CN 109493781 B CN109493781 B CN 109493781B
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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
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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
- G09G3/3688—Details of drivers for data electrodes suitable for active matrices only
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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
- G09G3/3696—Generation of voltages supplied to electrode drivers
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- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The application relates to a driving device and a display apparatus. The driving device comprises a common voltage driving module, a source electrode driving module and a control module. The source electrode drive comprises a data module, and the data module is used for outputting a data basic signal; the source driver has an output for outputting a data signal. The control module comprises a control unit, a first switch unit electrically connected with the control unit and a second switch unit electrically connected with the control unit; the first switch unit is also electrically connected with the public voltage drive and output end, and the second switch unit is also electrically connected with the data module and the output end. The driving device provided by the application can effectively prevent abnormal flashing of the power-on.
Description
Technical Field
The present application relates to the field of display technologies, and in particular, to a driving apparatus and a display device.
Background
With the development of display technology, various types of display devices enrich the production and life of people. The display panel of a display device typically comprises a plurality of sub-pixels. Each sub-pixel realizes display through the voltage difference generated by different voltages on the common electrode and the pixel electrode thereof.
The voltage on the common electrode is usually determined by a common voltage signal output by Gamma driving (a common voltage driving), and the voltage on the pixel electrode is usually determined by a data signal output by source driving. After the display device powers on the driving device, the source driver needs to perform a reset process to clear some residual information stored in the previous display operation. Therefore, the data signal output by the source driver is usually later than the common voltage signal output by the Gamma driver. This results in that after the voltage on the common electrode reaches the predetermined voltage, the voltage on the pixel electrode may still be 0V without rising to the predetermined voltage. At this time, the display device may have an abnormal flashing problem.
Disclosure of Invention
In view of the above, it is desirable to provide a driving device and a display apparatus capable of improving the abnormal flash problem in view of the above technical problems.
A drive device, comprising:
a common voltage drive for outputting a common voltage signal;
the source electrode drive comprises a data module, wherein the data module is used for outputting a data basic signal; the source driver has an output end for outputting a data signal;
the control module comprises a control unit, a first switch unit electrically connected with the control unit and a second switch unit electrically connected with the control unit; the first switch unit is also electrically connected with the public voltage driver and the output end, and the second switch unit is also electrically connected with the data module and the output end;
after the driving device is powered on, the control unit switches on the first switch unit and switches off the second switch unit so as to enable the data signal output by the output end to be the common voltage signal;
after the driving device is powered on, the control unit is further configured to start timing, and after the timing reaches a predetermined time, the control unit turns on the second switch unit and turns off the first switch unit, so that the data signal output by the output end is the data base signal; the duration of the preset time is not less than 0.5T, and T is preset one-frame display duration.
In one embodiment, the predetermined time is 0.5T-5T in duration.
In one embodiment, the first switching unit and/or the second switching unit is a three-terminal switching device.
In one of the embodiments, the first and second electrodes are,
the first switch unit is a P-type field effect transistor, and the second switch unit is an N-type field effect transistor;
or, the first switch unit is an N-type field effect transistor, and the second switch unit is a P-type field effect transistor.
In one embodiment, the control unit is further electrically connected with the output end and monitors the data signal output by the output end; and when the voltage value of the data signal is monitored to be the voltage value of the public voltage signal, the control unit starts timing.
In one embodiment, the driving device further includes:
the time schedule controller is electrically connected with the control unit;
the grid drive is electrically connected with the time sequence controller;
and the time schedule controller controls the grid drive to output scanning signals when the control unit starts timing.
In one embodiment, the control module is located in the source driver.
In one embodiment, the driving device further includes a control circuit board, the common voltage driver is located on the control circuit board, the control circuit board is electrically connected to the common voltage driver, and the control unit and the second switch unit are located in the source driver; the first switch unit is located on the control circuit board.
A drive device, comprising:
a common voltage drive for outputting a common voltage signal;
a source driver having an output for outputting a data signal; the source electrode drive comprises a data module and a control module;
the data module is used for outputting a data basic signal;
the control module comprises a control unit, a first conductive type field effect transistor and a second conductive type field effect transistor; the control unit is electrically connected with the output end, the grid electrode of the first conductive type field effect transistor is electrically connected with the control unit, the source electrode of the first conductive type field effect transistor is electrically connected with the common voltage drive, and the drain electrode of the first conductive type field effect transistor is electrically connected with the output end; the grid electrode of the second conductive type field effect transistor is electrically connected with the control unit, the source electrode of the second conductive type field effect transistor is electrically connected with the data module, and the drain electrode of the first conductive type field effect transistor is electrically connected with the output end;
after the driving device is powered on, the control unit switches on the first conductivity type field effect transistor and switches off the second conductivity type field effect transistor, so that the data signal output by the output end is the common voltage signal;
after the driving device is powered on, the control unit also monitors the data signal output by the output end; when the voltage value of the data signal is monitored to be the voltage value of the public voltage signal, the control unit starts timing;
and after the timing reaches one frame of display duration, the control unit switches on the second conductivity type field effect transistor and switches off the first conductivity type field effect transistor so as to enable the data signal output by the output end to be the data base signal.
A display device comprising a display panel and a driving apparatus as described in any of the above embodiments for driving the display panel, the display panel comprising sub-pixels, the sub-pixels comprising a pixel electrode, a common electrode, and liquid crystal molecules between the pixel electrode and the common electrode; the pixel electrode is electrically connected with the source electrode driver and used for receiving the data signal, and the common electrode is electrically connected with the common voltage driver and used for receiving the common voltage signal.
In the driving device, within a period of time just after the power-on, the control unit switches on the first switch unit and switches off the second switch unit, so that the data signal output by the output end of the source electrode drive is the common voltage signal. Therefore, when the sub-pixels on the display panel are turned on, the pixel electrodes are rapidly charged by the common voltage signal, and the voltage on the pixel electrodes charged by the common voltage signal is almost equal to the voltage on the common electrode charged by the common voltage signal. Therefore, the display frame is displayed as black at this time, and the abnormal flash problem caused by the voltage of 0V on the pixel electrode can not occur.
When the display is powered on for more than the preset time, the data module finishes the reset processing work and can effectively output the data basic signal. At this time, the control unit turns on the second switch unit and turns off the first switch unit to make the data signal output by the output terminal be the data base signal, thereby performing normal display operation.
Drawings
FIG. 1 is a schematic diagram of a prior art display device;
FIG. 2 is a schematic diagram of a prior art sub-pixel;
FIG. 3 is a schematic view of a prior art drive apparatus;
FIG. 4 is a schematic view of a drive device according to an embodiment of the present application;
FIG. 5 is a timing diagram of various signals output by the driving apparatus according to an embodiment of the present application;
fig. 6 is a schematic view of a driving device in another embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The driving device provided by the application can be applied to but is not limited to the driving of a liquid crystal display device. Here, a liquid crystal display device is explained as an example.
Referring to fig. 1, the liquid crystal display device generally includes a display panel 100 and a driving apparatus 200 driving the display panel 100.
The display panel 100 generally includes a plurality of sub-pixels 110 of different colors, such as a red sub-pixel R, a green sub-pixel G, a blue sub-pixel B, and so on. A plurality of different color sub-pixels 110 may form one display unit. The sub-pixels 110 of the various colors within a display unit cooperate so that the display unit can display any desired color. Meanwhile, all the sub-pixels 110 of the display panel are sequentially arranged in a plurality of rows, and the number of the sub-pixels 110 in each row is plural. Referring to fig. 2, the sub-pixel 110 may include a pixel electrode 111, a common electrode 112, and liquid crystal molecules 113 therebetween.
The display panel 100 generally further includes scan lines 120 and data lines 130 (see fig. 1). When the display panel is in operation, the scan line 120 receives the scan signal Vscan from the driving device 200, and turns on each of the sub-pixels 110 line by line. Meanwhile, the data line 130 receives the data signal Vdata of the driving device 200, and further charges the pixel electrode 111 of each sub-pixel 110 while each row of sub-pixels 110 is turned on. The pixel electrode 111 receives the data signal Vdata, and the common electrode 112 receives the common voltage signal Vcom on the driving device 200, so as to generate a voltage difference between the pixel electrode 111 and the common electrode 112, and deflect the liquid crystal molecules 113 to transmit light for display.
Referring to fig. 3, the driving apparatus 200 generally includes a common voltage driver 210, a gate driver 220, and a source driver 230. The common voltage driver 210 is generally a Gamma driver for outputting a common voltage signal Vcom, the gate driver 220 for outputting a scan signal Vscan, and the source driver 230 for outputting a data signal Vdata. When the display device is powered on to operate the display, the common voltage driver 210, the gate driver 220, and the source driver 230 are usually simultaneously receiving the operation signal.
The common voltage driver 210 receives the working signal and then outputs a common voltage signal Vcom to the common electrode 112. However, the gate driver 220 needs to perform a reset process to clear some residual information stored in the previous display operation before outputting the scan signal Vscan. Similarly, the source driver 230 also needs to perform a reset process to clear some residual information stored in the previous display operation before outputting the data signal Vdata. The scan signal Vscan and the data signal Vdata are generally later than the common voltage signal Vcom.
Further, since the internal circuit configuration and the information to be erased are not the same, the time for performing the reset process in the gate driver 220 and the time for performing the reset process in the source driver 230 are not necessarily the same, that is, the timing of outputting the scan signal Vscan and the data signal Vdata are not necessarily the same.
When the scan signal Vscan is earlier than the data signal Vdata, the driving device 200 sequentially outputs the common voltage signal Vcom, the scan signal Vscan, and the data signal Vdata according to the timing sequence. This causes the common voltage signal Vcom to be received on the common electrode 112 to reach the predetermined voltage when the sub-pixel 110 of the display panel 100 is turned on by the scan signal Vscan, and no data signal Vdata is acceptable on the pixel electrode 111, resulting in a voltage of 0V rather than the predetermined voltage. This causes an abnormal voltage difference between the pixel electrode 111 and the common electrode 112, which in turn causes an abnormal flash to appear.
In order to solve the above-mentioned flash line problem, the present application provides a driving device and a display device.
In one embodiment, a display device is provided, including a display panel 100 and a driving apparatus 200 driving the display panel. The display panel 100 includes a sub-pixel 110. The sub-pixel 110 includes a pixel electrode 111, a common electrode 112, and liquid crystal molecules 113 between the pixel electrode 111 and the common electrode 112. The pixel electrode 111 is electrically connected to the source driver 230 and is used for receiving a data signal Vdata, and the common electrode 112 is electrically connected to the common voltage driver 210 and is used for receiving a common voltage signal Vcom.
In one embodiment, referring to fig. 4, the driving apparatus 200 includes a common voltage driver 210 and a source driver 230. The common voltage driver 210 is used for outputting a common voltage signal Vcom, and the source driver 230 is used for outputting a data signal Vdata. The source driver 230 specifically includes a data block 231. The data module 231 is used for outputting a data base signal Vdata 1. The data base signal Vdata1 herein is the same signal as the data signal Vdata of the conventional display device. The source driver 230 has an output terminal S for outputting the data signal Vdata.
In addition, the driving apparatus 200 further includes a control module 240. The control module 240 includes a control unit 241, a first switching unit 242, and a second switching unit 243. The first and second switching units 242 and 243 are electrically connected to the control unit 241. Meanwhile, the first switch unit 242 is electrically connected to the common voltage driver 210 and the output terminal S, and is used for controlling the on/off of the circuit between the common voltage driver 210 and the output terminal S. The second switch unit 243 is further electrically connected to the data module 231 and the output end S for controlling the on/off of the circuit between the data module 231 and the output end S.
After the driving apparatus is powered on, the control unit 241 turns on the first switching unit 242 and turns off the second switching unit 243. At this time, the circuit between the output terminal S and the common voltage driver 210 is turned on, and the circuit between the output terminal S and the data module 231 is turned off. Therefore, the common voltage signal Vcom flows into the output terminal S, i.e., the data signal Vdata output by the output terminal S is the common voltage signal Vcom. Therefore, when the sub-pixel 110 on the display panel 100 is turned on, the pixel electrode 111 is rapidly charged by the common voltage signal Vcom, and the voltage on the pixel electrode 111 charged by the common voltage signal Vcom is almost equal to the voltage on the common electrode 112 charged by the common voltage signal Vcom. Therefore, the liquid crystal molecules in the sub-pixel 110 are not deflected at this time, so that the display screen is displayed as black, and the abnormal flash problem caused by the voltage on the pixel electrode 111 being 0V does not occur.
After the driving device is powered on, the control unit starts timing while controlling the first switch unit 242 and the second switch unit 243 to be on and off. After the timer reaches a predetermined time, the control unit 241 turns on the second switching unit 243 and turns off the first switching unit 242. At this time, the circuit between the output terminal S and the common voltage driver 210 is turned off, and the circuit between the output terminal S and the data module 231 is turned on. Therefore, the data base signal Vdata1 flows into the output terminal S, i.e., the data signal Vdata output from the output terminal S is the data base signal Vdata 1.
When the display is powered on for more than a predetermined time, the data module 231 of the source driver 230 has completed the reset process and can effectively output the data base signal Vdata 1. At this time, control section 241 makes data signal Vdata output from output terminal S be data base signal Vdata1, thereby enabling normal display operation.
Fig. 5 is a timing diagram of the data signal Vdata, the common voltage signal Vcom and the scanning voltage of a certain row of sub-pixels output by the driving device 200.
In the embodiment of the present application, after the driving device is powered on, the first switch unit 241 is turned on first, and then the second switch unit 242 is turned on, that is, the common voltage signal Vcom flows into the output terminal S as the data signal Vdata, and then the data base signal Vdata1 flows into the output terminal S as the data signal Vdata. Therefore, the problem of boot flashline can be effectively prevented.
Assuming that the display time duration of one frame is T, the time duration of the predetermined time in the embodiment of the present application is not less than 0.5T. The data module 231 can be effectively ensured to complete the reset processing within 0.5T, and the data base signal Vdata1 can be effectively output.
In addition, if the duration of the predetermined time is prolonged to be more than 0.5T, it can be ensured that the data signal Vdata is an effective data base signal Vdata1 after the data module 231 can complete the reset processing, thereby preventing the wire flash problem; and the arrangement direction of the liquid crystal molecules 113 in the sub-pixel 110 can be effectively adjusted, so that the display effect is better.
Specifically, the display panel 100 performs display by transmitting light from a backlight by the deflection of the liquid crystal molecules 113. However, the direction of the liquid crystal molecules 113 deflected during the previous display process affects the alignment direction of the liquid crystal molecules 113 in the display panel after the current display. By the next display, the alignment direction of the liquid crystal molecules 113 in the display panel 100 is affected by the previous display. Therefore, the voltage on the pixel electrode 111 is made equal (equal or nearly equal) to the voltage on the common electrode 112 immediately before the next display, so that a black screen is displayed, the alignment direction of the liquid crystal molecules 113 can be aligned, the influence of the previous display on the alignment direction of the liquid crystal molecules 113 can be eliminated, and the subsequent display effect can be improved.
The duration of the predetermined time is prolonged to be more than 0.5T, and the signals received by the pixel electrode 111 and the common electrode 112 are both from the common voltage signal Vcom, so that the voltage on the pixel electrode 111 is equivalent to the voltage on the common electrode 112 to display a black picture, and the arrangement direction of the liquid crystal molecules 113 in the display panel 100 can be effectively adjusted.
In one embodiment, the predetermined time is 0.5T-5T in duration, i.e., the predetermined time is no greater than 5T in duration. Therefore, the arrangement direction of the liquid crystal molecules 113 can be effectively adjusted, and the display effect is not affected by the excessively long blackened surface before display.
Of course, in the embodiment of the present application, the data basic signal Vdata1 equivalent to the common voltage signal Vcom can be output through the data module 231 and flow into the output terminal S as the data signal Vdata within a period of time after the timing reaches the predetermined time. The voltage on the pixel electrode 111 receiving the data signal Vdata at this time may be equivalent to the voltage on the common electrode 112 receiving the common electrode signal, thereby effectively aligning the alignment direction of the liquid crystal molecules 113. For example, the predetermined time may be set to 1T, and then the data base signal Vdata1 equivalent to the common voltage signal Vcom is output through the data module 231 and flows into the output terminal S as the data signal Vdata for a time of 4T after the timing reaches the predetermined time.
In the embodiment of the present application, the first switch unit 242 needs to be electrically connected to the control unit 241, the output terminal S, and the common voltage driver 210. The second switch unit 243 needs to be electrically connected to the control unit 241, the output terminal S, and the data module 231. Therefore, the first and second switch units 242 and 243 each require at least three electrical connection points. Therefore, the first switching unit 242 and the second switching unit 243 may be both three-terminal switching devices, or one of them may be a three-terminal switching device.
In one embodiment, the first switching unit 242 and the second switching unit 243 may be selected to be field effect transistors with two different conductivity types. The field effect transistors have different conductivity types, so that the control unit 241 can control the on/off of the first switch unit 242 and the second switch unit 243 conveniently by controlling the difference of the data voltages.
Specifically, the first switching unit 242 may be provided as a P-type field effect transistor, and the second switching unit 243 may be provided as an N-type field effect transistor. At this time, after the driving apparatus is powered on, before the control unit 242 times for a predetermined time, the control unit 241 outputs a low level signal, so that the first switch unit 242 (P-type field effect transistor) is turned on and the second switch unit 243 (N-type field effect transistor) is turned off. After the control unit 242 times for a predetermined time, the control unit 241 outputs a high level signal, so that the first switch unit 242 (P-type field effect transistor) is turned off and the second switch unit 243 (N-type field effect transistor) is turned on.
The first switching unit 242 may be an N-type field effect transistor, and the second switching unit 243 may be a P-type field effect transistor. At this time, after the driving apparatus is powered on, before the control unit 242 times for a predetermined time, the control unit 241 outputs a high level signal, so that the first switch unit 242 (N-type field effect transistor) is turned on and the second switch unit 243 (P-type field effect transistor) is turned off. After the control unit 242 times for a predetermined time, the control unit 241 outputs a low level signal, so that the first switch unit 242 (N-type field effect transistor) is turned off and the second switch unit 243 (P-type field effect transistor) is turned on.
Of course, in the embodiment of the present application, the first switching unit 242 and the second switching unit 243 may also be other types of three-terminal switching devices, such as a switching triode. Alternatively, the first switch unit 242 and the second switch unit 243 may also be multi-terminal switch devices, such as a four-terminal triac. The first switch unit 242 and the second switch unit 243 are not limited in specific form as long as the switch function of the present application can be achieved.
With continued reference to fig. 4, in one embodiment, the control unit 241 is also electrically connected to the output terminal S of the source driver 230 and monitors the data signal Vdata output by the output terminal S. When the voltage value of the data signal Vdata is monitored to be the voltage value of the common voltage signal Vcom, the control unit starts timing. The control unit 241 may be given a timed starting point at this time, which facilitates timing control within the control unit 241.
Of course, in the embodiment of the present application, the control unit 241 may not be electrically connected to the output terminal S of the source driver 230. At this time, the driving apparatus 200 may further include a timing controller (not shown). The timing controller may be electrically connected to the common voltage driver 210, the gate driver 220, the data module 231, and the control unit 241, and further send a working signal to the control unit 241 while sending a working signal to the common voltage driver 210, the gate driver 220, and the data module 231. The common voltage driver 210 receives the operation signal and outputs a common voltage signal Vcom. The gate driver 220 receives the operation signal and outputs the scan signal Vscan. The data module 231 receives the working signal and outputs a data base signal Vdata 1. The control unit 241 counts time after receiving the operation signal.
The timing control of the gate driver 220 may also be different from the above. In one embodiment, the driving apparatus 200 further includes a timing controller. The timing controller also electrically connects the gate driver 220 and the control unit 241. However, in this embodiment, after the control unit 241 starts timing (for example, after the control unit 241 monitors the common voltage signal Vcom and starts timing), the control unit 241 sends a signal to the timing controller, and the timing controller receives the corresponding signal and controls the gate driver 220 to output the scan signal Vscan, thereby enriching the operation mode of the gate driver 220.
When the control unit 241 starts to count when the voltage value of the data signal Vdata is monitored to be the voltage value of the common voltage signal Vcom, the gate driver 220 starts to output the scan signal Vscan, which also helps to determine the circuit fault between the circuit common voltage driver 210 and the output terminal S. At this time, if the common voltage driver 210 and the output terminal S are disconnected, the control unit 241 cannot monitor the correct data signal Vdata and does not count the time, so the gate driver 220 does not output the scan signal Vscan. At this time, the display panel 100 will not display any more. During testing or application, if the display panel 100 has similar phenomena, it can be determined that there may be a circuit failure between the common voltage driver 210 and the output terminal S.
The specific location of the control module 240 is not overly limited and can be located in a variety of locations within the drive device 200.
In one embodiment, with continued reference to fig. 4, the control module 240 is located in the source driver 230, and thus can conveniently electrically connect the data module 231 of the source driver 230 with the output terminal S.
In another embodiment, referring to fig. 6, the driving apparatus further includes a control circuit board 250. The control circuit board 250 may have a timing controller thereon. The timing controller may be used to control the common voltage driving 210, the gate driving 220, the source driving 230, and the like. The common voltage driver 210 may also be located on the control circuit board 250. At this time, the control unit 241 and the second switch unit 243 may be disposed in the source driver 230, so as to electrically connect the data module 231 of the source driver 230 and the output terminal S. Meanwhile, the first switching unit 242 is disposed on the control circuit board 250, and is thus conveniently electrically connected to the common voltage driver 210.
In one embodiment, the driving apparatus includes a common voltage driver 210, a source driver 230, and a control module 240. The common voltage driver 210 is used to output a common voltage signal Vcom. The source driver 230 includes a data module 231 and a control module 240. The data module 231 is used for outputting a data base signal Vdata 1. The data base signal Vdata1 herein is the same signal as the data signal Vdata of the conventional display device. The source driver 230 has an output terminal S for outputting the data signal Vdata.
The control module 240 includes a control unit 241, a first conductive type field effect transistor, and a second conductive type field effect transistor. The control unit 241 is electrically connected with the output end, the grid electrode of the first conductive type field effect transistor is electrically connected with the control unit 241, the source electrode of the first conductive type field effect transistor is electrically connected with the common voltage driver 210, and the drain electrode of the first conductive type field effect transistor is electrically connected with the output end S; the gate of the second conductive type field effect transistor is electrically connected to the control unit 241, the source of the second conductive type field effect transistor is electrically connected to the data module 231, and the drain of the first conductive type field effect transistor is electrically connected to the output terminal S.
After the driving device is powered on, the control unit 241 turns on the first conductive type field effect transistor and turns off the second conductive type field effect transistor, so that the data signal Vdata output by the output terminal S is the common voltage signal Vcom.
After the driving device is powered on, the control unit 241 also monitors the data signal Vdata output by the output terminal S. When the voltage value of the data signal Vdata is monitored to be the voltage value of the common voltage signal Vcom, the control unit 241 starts timing. After the timing reaches a frame display duration, the control unit 241 turns on the second conductive type field effect transistor and turns off the first conductive type field effect transistor, so that the data signal Vdata output by the output terminal S is the data base signal Vdata 1.
In this embodiment, within the period of one frame display duration after the driving device is powered on, the data signal Vdata output by the output terminal S of the source driver is the incoming common voltage signal Vcom, and after the period of one frame display duration, the data module has completed the reset processing and can effectively output the data base signal. At this time, the data signal Vdata output by the output terminal S of the source driver is an incoming data base signal, so that normal display operation can be performed, and the problem of power-on flash is effectively prevented.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A drive device, comprising:
a common voltage drive for outputting a common voltage signal;
the source electrode drive comprises a data module, wherein the data module is used for outputting a data basic signal; the source driver has an output end for outputting a data signal;
the control module comprises a control unit, a first switch unit electrically connected with the control unit and a second switch unit electrically connected with the control unit; the first switch unit is also electrically connected with the public voltage driver and the output end, and the second switch unit is also electrically connected with the data module and the output end;
after the driving device is powered on, the control unit switches on the first switch unit and switches off the second switch unit so as to enable the data signal output by the output end to be the common voltage signal;
after the driving device is powered on, the control unit is further configured to start timing, and after the timing reaches a predetermined time, the control unit turns on the second switch unit and turns off the first switch unit, so that the data signal output by the output end is the data base signal; the duration of the preset time is not less than 0.5T, and T is preset one-frame display duration;
and after the driving device is powered on, the common voltage signal is firstly output as a data signal, and after the timing reaches the preset time, the data basic signal is output as the data signal.
2. The drive device according to claim 1, wherein the predetermined time is 0.5T to 5T in duration.
3. The driving device according to claim 1, wherein the first switching unit and/or the second switching unit is a three-terminal switching device.
4. The drive device according to claim 3,
the first switch unit is a P-type field effect transistor, and the second switch unit is an N-type field effect transistor;
or, the first switch unit is an N-type field effect transistor, and the second switch unit is a P-type field effect transistor.
5. The driving device according to claim 1, wherein the control unit is further electrically connected to the output terminal and monitors the data signal output from the output terminal; and when the voltage value of the data signal is monitored to be the voltage value of the public voltage signal, the control unit starts timing.
6. The drive device according to claim 1 or 5, characterized in that the drive device further comprises:
the time schedule controller is electrically connected with the control unit;
the grid drive is electrically connected with the time sequence controller;
and the time schedule controller controls the grid drive to output scanning signals when the control unit starts timing.
7. The driving apparatus as claimed in claim 1, wherein the control module is located in the source driver.
8. The driving device according to claim 1, further comprising a control circuit board, wherein the common voltage driver is located on the control circuit board, the control circuit board is electrically connected to the common voltage driver, and the control unit and the second switching unit are located in a source driver; the first switch unit is located on the control circuit board.
9. A drive device, comprising:
a common voltage drive for outputting a common voltage signal;
a source driver having an output for outputting a data signal; the source electrode drive comprises a data module and a control module;
the data module is used for outputting a data basic signal;
the control module comprises a control unit, a first conductive type field effect transistor and a second conductive type field effect transistor; the control unit is electrically connected with the output end, the grid electrode of the first conductive type field effect transistor is electrically connected with the control unit, the source electrode of the first conductive type field effect transistor is electrically connected with the common voltage drive, and the drain electrode of the first conductive type field effect transistor is electrically connected with the output end; the grid electrode of the second conductive type field effect transistor is electrically connected with the control unit, the source electrode of the second conductive type field effect transistor is electrically connected with the data module, and the drain electrode of the first conductive type field effect transistor is electrically connected with the output end;
after the driving device is powered on, the control unit switches on the first conductivity type field effect transistor and switches off the second conductivity type field effect transistor, so that the data signal output by the output end is the common voltage signal;
after the driving device is powered on, the control unit also monitors the data signal output by the output end; when the voltage value of the data signal is monitored to be the voltage value of the public voltage signal, the control unit starts timing;
and after the timing reaches one frame of display duration, the control unit switches on the second conductivity type field effect transistor and switches off the first conductivity type field effect transistor so as to enable the data signal output by the output end to be the data base signal.
10. A display device comprising a display panel and the driving apparatus of any one of claims 1 to 9 driving the display panel, the display panel comprising sub-pixels including a pixel electrode, a common electrode, and liquid crystal molecules between the pixel electrode and the common electrode; the pixel electrode is electrically connected with the source electrode driver and used for receiving the data signal, and the common electrode is electrically connected with the common voltage driver and used for receiving the common voltage signal.
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| CN201811474138.XA CN109493781B (en) | 2018-12-04 | 2018-12-04 | Driving device and display apparatus |
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| CN110444174A (en) | 2019-06-11 | 2019-11-12 | 惠科股份有限公司 | A kind of driving method and driving circuit of display panel |
| CN112992092B (en) * | 2021-02-19 | 2022-10-14 | 昆山龙腾光电股份有限公司 | Drive circuit and control method thereof |
| WO2023272589A1 (en) * | 2021-06-30 | 2023-01-05 | 京东方科技集团股份有限公司 | Display panel driving method |
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| TWI291153B (en) * | 2005-09-26 | 2007-12-11 | Au Optronics Corp | Display panels, driving method thereof and electronic devices using the same |
| KR101351373B1 (en) * | 2006-12-07 | 2014-01-15 | 엘지디스플레이 주식회사 | Liquid Crystal Display and Driving Method Thereof |
| CN105513553B (en) * | 2016-01-27 | 2018-12-11 | 京东方科技集团股份有限公司 | Pixel circuit and its driving method, display panel and display device |
| CN206194351U (en) * | 2016-11-24 | 2017-05-24 | 合肥鑫晟光电科技有限公司 | Source driver circuit and display device |
| CN108711406A (en) * | 2018-05-31 | 2018-10-26 | 厦门天马微电子有限公司 | A kind of display panel and control method |
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