CN109979372B - Display device and driving method thereof - Google Patents
Display device and driving method thereof Download PDFInfo
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- CN109979372B CN109979372B CN201910371318.3A CN201910371318A CN109979372B CN 109979372 B CN109979372 B CN 109979372B CN 201910371318 A CN201910371318 A CN 201910371318A CN 109979372 B CN109979372 B CN 109979372B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
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- G—PHYSICS
- 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
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0264—Details of driving circuits
- G09G2310/0286—Details of a shift registers arranged for use in a driving circuit
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Abstract
The embodiment of the invention discloses a display device and a driving method thereof. The display device includes: the device comprises a display panel, a scanning driving module, a data driving module and a control module; the scanning driving module comprises a test signal end which is electrically connected with the control module; the control module is used for controlling the driving mode of the scanning driving module to be forward scanning in a 2k +1 th frame after detecting the abnormal signal of the test signal end, and controlling the data driving module to output a forward data signal for displaying an image to the display panel; and in the 2k +2 th frame, controlling the driving mode of the scanning driving module to be reverse scanning, and controlling the data driving module to output an inverted data signal of a display image to the display panel. Compared with the prior art, the embodiment of the invention can continuously display the basically complete image when the output of the scanning driving module is abnormal, thereby improving the reliability of the display device and being beneficial to improving the safety of the display device when being applied to a vehicle.
Description
Technical Field
The embodiment of the invention relates to the technical field of display, in particular to a display device and a driving method thereof.
Background
With the continuous development of display technologies, the display device is applied more and more widely, for example, the display device is applied to products such as a mobile phone, a computer, a tablet computer, an electronic book, an information query machine, and the like, and can also be applied to a meter display (for example, a vehicle-mounted display), a control panel of a smart home, and the like.
As shown in fig. 1, in the prior art, a hidden defect may exist in a display device, for example, a foreign object, a circuit defect, a contact defect, or the like exists in the display device, the defect is not detected in a detection stage, and a fault image appears during normal use. For example, the area 110 is a normally displayed image, and the area 120 is an invisible or inconspicuous image. When the display device has a fault image, the display image cannot be normally viewed, and the driving safety of the instrument display device displaying the running information or the road condition information is seriously influenced. Therefore, the conventional display device has a problem of poor reliability.
Disclosure of Invention
The embodiment of the invention provides a display device and a driving method thereof, which are used for improving the reliability of the display device.
In a first aspect, an embodiment of the present invention provides a display device, including:
a display panel;
the device comprises a scanning driving module, a data driving module and a control module;
the scanning driving module comprises a test signal end, and the test signal end is electrically connected with the control module; the control module is used for controlling the driving mode of the scanning driving module to be forward scanning and controlling the data driving module to output a forward data signal for displaying an image to the display panel in a 2k +1 th frame after detecting the abnormal signal of the test signal end; in the 2k +2 th frame, controlling the driving mode of the scanning driving module to be reverse scanning, and controlling the data driving module to output an inverted data signal of the display image to the display panel; wherein k is a non-negative integer.
In a second aspect, an embodiment of the present invention further provides a driving method of a display device, where the driving method of the display device includes:
detecting a test signal of the test signal terminal;
if the test signal is an abnormal signal, in a 2k +1 th frame, controlling the driving mode of the scanning driving module to be forward scanning, and controlling the data driving module to output a forward data signal of a display image to the display panel; in the 2k +2 th frame, controlling the driving mode of the scanning driving module to be reverse scanning, and controlling the data driving module to output an inverted data signal of the display image to the display panel; wherein k is a non-negative integer.
In the embodiment of the invention, the scanning driving module comprises a testing signal end which is electrically connected with the control module, and the control module can switch the driving mode of the display device after detecting the abnormal signal of the testing signal end, wherein the driving mode of the display device is that in two adjacent frames, forward scanning and reverse scanning are alternately executed, two frames of fault images are combined into one frame of basically complete image, and only the failure output end displays a poor image (for example, a bright line or a dark line). Compared with the prior art, the embodiment of the invention avoids the condition that the output of the rear-stage output end of the output end is abnormal because the output of one output end of the scanning driving circuit is abnormal. Therefore, when the output of the scanning driving module is abnormal, the embodiment of the invention can continuously display the whole image, thereby improving the reliability of the display device and being beneficial to improving the safety of the display device when being applied to a vehicle.
Drawings
Fig. 1 is a schematic structural diagram of a conventional display device;
fig. 2 is a schematic structural diagram of a display device according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another display device according to an embodiment of the disclosure;
fig. 4 is a schematic structural diagram of another display device according to an embodiment of the present invention;
FIG. 5 is a schematic structural diagram of another display device according to an embodiment of the present disclosure;
fig. 6 is a schematic structural diagram of a shift register unit according to an embodiment of the present invention;
fig. 7 is a flowchart illustrating a driving method of a display device according to an embodiment of the present invention;
FIG. 8 is a flowchart illustrating another driving method of a display device according to an embodiment of the present invention;
fig. 9 is a flowchart illustrating a driving method of a display device according to another embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
As described in the background art, the conventional display device has a problem of poor reliability. The inventor researches and finds that the reason of the problem is as follows:
referring to fig. 1, the display device includes a scan driving module 130 and a data driving module 140. When displaying a frame of image, the scan driving module 130 sequentially sends scan signals to corresponding scan lines to implement progressive scanning of the display unit. When each row of display units is scanned, the scanning driving module 130 controls the row of display units to be turned on, the data driving module 140 sends data signals to the corresponding data lines, and the data signals are written into the row of display units, so that the row of display units are controlled to emit light. For example, when the scan driving module 130 scans a first row of display units, the data driving module 140 sends data signals of the first row of display units to the data lines; when the scan driving module 130 scans the second row of display cells, the data driving module 140 sends data signals of the second row of display cells to the data lines, … …, and when the scan driving module 130 scans the last row of display cells, the data driving module 140 sends data signals of the last row of display cells to the data lines. Thus, the display device can display a complete image of one frame.
The scan driving module 130 includes a plurality of shift register units connected in cascade, and an output end of the shift register unit is used as an output end of the scan driving module 130. The output end of a shift register unit of one stage is electrically connected with the input end of a shift register unit of the next stage. Due to the poor recessiveness of the display device, the output of a shift register unit in one stage of the scan driving module 130 may be abnormal, and the input signal of the shift register unit in the next stage is also an abnormal signal, so that all the shift register units in the next stage of the faulty shift register unit output abnormal signals. Thus, in the region 120, the scan lines cannot normally turn on the display cells, and the data signals cannot be normally written into the display cells. Therefore, the display device has a failure image as shown in fig. 1, and for the instrument display device displaying the operation information or the traffic information, the driving safety is seriously affected, so that the prior art has a problem of poor reliability.
In view of this, an embodiment of the present invention provides a display device. Fig. 2 is a schematic structural diagram of a display device according to an embodiment of the present invention. Referring to fig. 2, the display device includes: a display panel 200, a scan driving module 300, a data driving module 400, and a control module 700. The scan driving module 300 includes a test signal terminal (e.g., a first test signal terminal 301 or a second test signal terminal 303), and the test signal terminal is electrically connected to the control module 700; the control module 700 is configured to control the scan driving module 300 to perform forward scanning in a 2k +1 th frame after detecting an abnormal signal at the test signal end, and control the data driving module 400 to output a forward data signal for displaying an image to the display panel 200; in the 2k +2 th frame, the driving mode of the scan driving module 300 is controlled to be reverse scan, and the data driving module 400 is controlled to output an inverted data signal of a display image to the display panel 200; wherein k is a non-negative integer.
The test signal terminal is configured to output a test signal of the scan driving module 300, where the test signal may indicate whether the scan driving module 300 fails. For example, the test signal terminal is electrically connected to an output terminal 302 of the scan driving module 300, and when the output terminal 302 outputs an abnormal signal, the test signal output by the test signal output terminal is an abnormal signal. Illustratively, if there are situations such as missing pulses, abnormal number of pulses, excessive pulse voltage, too small pulse voltage, or malformed pulse shape in the pulses output by the output end 302 of the scan driving module 300, the output end 302 of the scan driving module 300 fails, and the scan driving module 300 fails.
The control module 700 is configured to receive a test signal from the scan driving module 300, control a scan mode of the scan driving module 300 according to the test signal, and control an output sequence of the data signal by the data driving module 400. Illustratively, when the output end 302 of the scan driving module 300 outputs an abnormal signal, if the scanning mode of the scan driving module 300 is forward scanning, specifically, along the column direction Y, the output end of the scan driving module 300 sequentially outputs scanning signals; correspondingly, the data driving module 400 outputs a forward data signal. In the area 210, the output ends of the scan driving module 300 are all outputting normally, and the area 210 displays images normally. When the output end 302 of the scan driving module 300 outputs an abnormal signal, if the display panel 200 is scanned reversely, specifically, in a direction opposite to the column direction Y, the output end of the scan driving module 300 sequentially outputs scan signals; correspondingly, the data driving module 400 outputs the inverted data signals, where the inverted data signals refer to that when one frame of image is displayed, the output sequence of the data signals is to output the data signals corresponding to the last row of display units along the column direction Y first, and finally output the data signals corresponding to the first row of display units along the column direction Y, that is, the output sequence of the inverted data signals is opposite to the output sequence of the forward data signals. In the area 220, the output of the scan driving module 300 is normal, and the area 220 displays the image normally.
Illustratively, the driving method of the display device is to detect a test signal of a test signal terminal. If the test signal is a normal signal, controlling the driving mode of the scan driving module 300 to be forward scan and controlling the data driving module 400 to output a forward data signal for displaying an image to the display panel 200 at each frame; alternatively, according to the normal signal, the driving method of the scan driving module 300 is controlled to be the reverse scan at every frame, and the data driving module 400 is controlled to output the inverted data signal of the display image to the display panel 200. If the test signal is an abnormal signal, in the 2k +1 th frame (odd frame), the driving mode of the scan driving module 300 is controlled to be forward scan, and the data driving module 400 is controlled to output a forward data signal for displaying an image to the display panel 200; in the 2k +2 th frame (even frame), the driving manner of the scan driving module 300 is controlled to be the reverse scan, and the data driving module 400 is controlled to output the inverted data signal of the display image to the display panel 200.
In the embodiment of the present invention, the scan driving module 300 is configured to include a test signal end, the test signal end is electrically connected to the control module 700, and after an abnormal signal of the test signal end is detected, the driving manner of the display device may be switched such that, in two adjacent frames, the forward scanning and the reverse scanning are alternately performed, the two frames of failure images are combined into a substantially complete frame of image, and only the failure output end 302 displays a failure (for example, a bright line or a dark line). Compared with the prior art, the embodiment of the invention avoids the condition that the output of the rear-stage output end of the output end is abnormal because the output of one output end of the scanning driving circuit is abnormal. Therefore, when the scan driving module 300 outputs an abnormal signal, the embodiment of the present invention can continuously display the whole image, thereby improving the reliability of the display device and being beneficial to improving the safety of the display device when the display device is applied to a vehicle.
With continued reference to fig. 2, on the basis of the above embodiments, optionally, the scan driving module 300 includes a first scan driving module 310 and a second scan driving module 320; the first scan driving module 310 and the second scan driving module 320 are respectively disposed at two sides of a display area (the display area includes an area 210 and an area 220 is exemplarily shown in fig. 2) of the display panel 200; the first scan driving module 310 includes a first test signal terminal 301, and the second scan driving module 320 includes a second test signal terminal 303; the first test signal terminal 301 and the second test signal terminal 303 are electrically connected to the control module 700.
The corresponding output ends of the first scan driving module 310 and the second scan driving module 320 are connected to the same scan line, and respectively transmit the same scan signal to the same scan line. The first test signal terminal 301 may be electrically connected to an output terminal of the first scan driving module 310 to output a test signal of the first scan driving module 310; the second test signal terminal 302 may be electrically connected to an output terminal of the second scan driving module 320 to output a test signal of the second scan driving module 320. The first test signal terminal 301 and the second test signal terminal 303 may be arranged in the same manner or in different manners. Illustratively, the first test signal terminal 301 is electrically connected to the output terminal 302 of the first scan driving module 310, and the second test signal terminal 303 is electrically connected to the output terminal 304 of the second scan driving module 320.
Illustratively, the display device is driven by detecting a test signal of the first test signal terminal 301 and a test signal of the second test signal terminal 303; if the test signal of the first test signal terminal 301 is an abnormal signal or the test signal of the second test signal terminal 303 is an abnormal signal, in the 2k +1 th frame, the driving modes of the first scan driving module 310 and the second scan driving module 320 are controlled to be forward scanning, and the data driving module 400 is controlled to output a forward data signal for displaying an image to the display panel 200; in the 2k +2 th frame, the driving manner of the first scan driving module 310 and the second scan driving module 320 is controlled to be the reverse scan, and the data driving module 400 is controlled to output the inverted data signal of the display image to the display panel 200.
In one aspect, the scan driving module 300 according to the embodiment of the invention includes the first scan driving module 310 and the second scan driving module 320, so as to enhance the uniformity of the scan signals at two ends of the scan line and facilitate to improve the uniformity of the turn-on time of the display unit. On the other hand, since the output terminals of the first scan driving module 310 and the second scan driving module 320 are electrically connected, the abnormal signal output by the first scan driving module 310 will affect the second scan driving module 320, and the abnormal signal output by the second scan driving module 320 will also affect the first scan driving module 310. In the embodiment of the present invention, the first scan driving module 310 and the second scan driving module 320 both include a test signal end, and when the first scan driving module 310 outputs an abnormal signal, the first test signal end 301 and the second test signal end 303 both output an abnormal signal, and the control module 700 switches the driving mode according to the abnormal signal. The embodiment of the invention avoids the phenomenon that the driving mode cannot be switched due to poor receiving of one receiving end of the control module 700, and improves the accuracy of abnormal signal detection and the reliability of the control module 700.
It should be noted that, in the foregoing embodiments, the control module 700 may be separately provided, or may be integrated with other driving chips in the display device, and the invention is not limited thereto. In practical applications, the setting can be performed as needed, and several typical setting modes are described below.
With continued reference to fig. 2, optionally, the display device further includes a flexible circuit board 500 and a main board 600; one end of the flexible circuit board 500 is bound to the display panel 200, and the other end of the flexible circuit board 500 is connected to the main board 600; the control module 700 is disposed on the main board 600. The control module 700 may be integrated into a Timing Controller (TCON), for example, and the TCON is disposed on the main board 600. The TCON controls the scan mode of the scan driving module 300 and the sequence of the data signals output by the data driving module 400 according to the test signals output by the scan driving module 300. In the embodiment of the present invention, the control module 700 is integrated on the basis of the existing TCON, no additional device is required, and only the number of the test signal terminals 301 and the number of the routing lines of the control module 700 are increased, so that the frame width of the display device is not increased.
Fig. 3 is a schematic structural diagram of another display device according to an embodiment of the present invention. Referring to fig. 3, the display panel 200 optionally includes a non-display region 230. The data driving module and the control module are integrated in a driving chip 800; the driving chip 800 is disposed in the non-display region 230, and the test signal terminal 301 is electrically connected to the driving chip 800. The driving chip 800 may further have a TCON function. The embodiment of the invention is arranged in such a way, which is beneficial to reducing the distance between the scanning driving module 300 and the control module, thereby being beneficial to the wiring of the display device.
With reference to fig. 3, on the basis of the foregoing embodiments, optionally, the scan driving module 300 is integrated on the display panel 200, for example, the scan driving module 300 may be integrated on the Array substrate of the display panel 200 by using a Gate Driver on Array (GOA) technology, so that the scan driving chip 800 does not need to be separately provided, which is beneficial to reducing the cost.
It should be noted that, in the foregoing embodiments, the data driving module 400 or the driving chip 800 is exemplarily shown to be disposed in the frame region of the display panel 200, which is not a limitation of the present invention. In other embodiments, a Chip On Flex (COF) technology may be further employed to dispose the data driving module 400 or the driving Chip 800 On the back side of the display panel 200, so as to reduce the frame width of the display device.
Fig. 4 is a schematic structural diagram of another display device according to an embodiment of the present invention. Referring to fig. 4, on the basis of the above embodiments, optionally, the scan driving module 300 includes a plurality of cascaded shift register units 330, and the test signal terminal 301 is electrically connected to the shift register unit 330 of the last stage. With the arrangement of the embodiment of the present invention, the test signal terminal 301 can detect the failure state of any one stage of output terminals in the scan driving module 300.
Fig. 5 is a schematic structural diagram of another display device according to an embodiment of the present invention. Referring to fig. 5, on the basis of the foregoing embodiments, optionally, the scan driving module 300 includes a plurality of cascaded shift register units 330, where the number of the test signal terminals 301 is multiple (fig. 5 exemplarily shows that each stage of the shift register units 330 corresponds to one test signal terminal); the plurality of test signal terminals are electrically connected to the plurality of shift register units 330, respectively.
Illustratively, the driving method of the display device is to detect test signals of a plurality of test signal terminals; if the test signal of one test signal terminal is an abnormal signal, the shift register unit 330 electrically connected to the test signal terminal or the shift register unit 330 at the previous stage thereof is abnormal in operation, and in the 2k +1 th frame, the driving mode of the scan driving module 300 is controlled to be forward scanning, and the data driving module 400 is controlled to output a forward data signal for displaying an image to the display panel 200; in the 2k +2 th frame, the driving method of the scan driving module 300 is controlled to be the reverse scan, and the data driving module 400 is controlled to output the inverted data signal of the display image to the display panel 200.
In the embodiment of the present invention, the number of the test signal terminals is set to be plural, so that not only the abnormal signal can be output to the control module 700, but also the fault position of the scan driving module 300 can be detected. Illustratively, if the test signal terminal corresponding to the shift register unit 330 of the first stage in the Y direction outputs an abnormal signal, the shift register unit 330 of the first stage malfunctions. If the test signal ends corresponding to the first stage shift register unit 330 and the second stage shift register unit 330 along the Y direction output normal signals, and the test signal ends corresponding to the third stage shift register unit 330 and the subsequent stage shift register unit 330 output abnormal signals, the third stage shift register unit 330 fails.
Fig. 6 is a schematic structural diagram of a shift register unit according to an embodiment of the present invention. Referring to fig. 6, on the basis of the above embodiments, optionally, the shift register unit 330 includes a plurality of control nodes (a pull-up node PU, a pull-down node PD, an output terminal Gn, and an input terminal Gn +1 are exemplarily shown in fig. 6), and the test signal terminal is electrically connected to at least one of the control nodes. Illustratively, the shift register unit 330 includes a pull-up circuit 331, a pull-up control circuit 332 that controls the pull-up circuit 331, a pull-down circuit 333, and a pull-down control circuit 334 that controls the pull-down circuit 333. And the control node comprises a pull-up node PU, a pull-down node PD, an output end Gn and an input end Gn + 1.
The embodiment of the invention sets the test signal end to be electrically connected with at least one control node, and can detect whether the scanning driving module has a fault or not through the output signal of the control node. Optionally, the number of the test signal terminals is multiple, and the multiple test signal terminals are electrically connected to the multiple control nodes of one shift register unit 330, respectively. The embodiment of the invention is arranged in such a way that the control module can not only detect the abnormal signal of the scanning driving module, but also detect the fault position of the shift register unit 330. Illustratively, if the test signal terminal corresponding to the pull-up node PU outputs an abnormal signal, the pull-up control circuit 332 fails. If the test signal terminal corresponding to the pull-down node PD outputs an abnormal signal, the pull-down control circuit 334 fails.
On the basis of the foregoing embodiments, the Display panel is optionally at least one of a Liquid Crystal Display (LCD), an Organic Light-Emitting Diode (OLED), a Micro LED (Micro LED), or an electrophoretic Display (EPD).
The embodiment of the invention also provides a driving method of the display device, and the driving method of the display device can be applied to the display device provided by any embodiment of the invention. Fig. 7 is a flowchart illustrating a driving method of a display device according to an embodiment of the present invention. Referring to fig. 7, the driving method of the display device includes the steps of:
s110, detecting a test signal of the test signal end.
S120, if the test signal is an abnormal signal, in a 2k +1 th frame, controlling the driving mode of the scanning driving module to be forward scanning, and controlling the data driving module to output a forward data signal for displaying an image to the display panel; in the 2k +2 th frame, controlling the driving mode of the scanning driving module to be reverse scanning, and controlling the data driving module to output an inverted data signal of a display image to the display panel; wherein k is a non-negative integer.
In the embodiment of the invention, after the abnormal signal of the test signal end is detected, the driving mode of the display device is switched to be that in two adjacent frames, forward scanning and reverse scanning are alternately executed, two frames of fault images are combined into one frame of basically complete image, and only a failure output end displays a failure (for example, a bright line or a dark line). Compared with the prior art, the embodiment of the invention avoids the condition that the output of the rear-stage output end of the output end is abnormal because the output of one output end of the scanning drive circuit is abnormal. Therefore, when the output of the scanning driving module is abnormal, the embodiment of the invention can continuously display the whole image, thereby improving the reliability of the display device and being beneficial to improving the safety of the display device when being applied to a vehicle.
On the basis of the foregoing embodiments, optionally, the scan driving module includes a plurality of cascaded shift register units; the number of the test signal ends is multiple, and the multiple test signal ends are respectively and electrically connected with the multiple shift register units. The driving method of the display device includes the steps of:
detecting test signals of a plurality of test signal terminals;
if the test signal of one test signal end is an abnormal signal, the shift register unit electrically connected with the test signal end or the preceding stage shift register unit thereof works abnormally, in the 2k +1 th frame, the driving mode of the scanning driving module is controlled to be forward scanning, and the data driving module is controlled to output a forward data signal for displaying an image to the display panel; and in the 2k +2 th frame, controlling the driving mode of the scanning driving module to be reverse scanning, and controlling the data driving module to output an inverted data signal of a display image to the display panel.
On the basis of the foregoing embodiments, optionally, the scan driving module includes a plurality of cascaded shift register units; the shift register unit comprises a plurality of control nodes, and the test signal end is electrically connected with at least one control node; the driving method of the display device includes the steps of:
detecting a test signal of at least one test signal terminal;
if the test signal of one test signal end is an abnormal signal, the control node electrically connected with the test signal end or the preceding stage control node thereof works abnormally, in the 2k +1 th frame, the driving mode of the scanning driving module is controlled to be forward scanning, and the data driving module is controlled to output a forward data signal for displaying an image to the display panel; and in the 2k +2 th frame, controlling the driving mode of the scanning driving module to be reverse scanning, and controlling the data driving module to output an inverted data signal of a display image to the display panel.
Fig. 8 is a flowchart illustrating another driving method of a display device according to an embodiment of the present invention. Referring to fig. 8, the driving method of the display device includes the steps of:
s210, detecting a test signal of the test signal end.
S220, if the test signal is an abnormal signal, in a 2k +1 th frame, controlling the driving mode of the scanning driving module to be forward scanning, and controlling the data driving module to output a forward data signal for displaying an image to the display panel; and in the 2k +2 th frame, controlling the driving mode of the scanning driving module to be reverse scanning, and controlling the data driving module to output an inverted data signal of a display image to the display panel.
S230, if the test signal is a normal signal, controlling the driving mode of the scanning driving module to be forward scanning and controlling the data driving module to output a forward data signal for displaying an image to the display panel in each frame; or, according to the normal signal, in each frame, controlling the driving mode of the scanning driving module to be reverse scanning, and controlling the data driving module to output an inverted data signal of the display image to the display panel.
On the basis of the foregoing embodiments, optionally, the scan driving module includes a first scan driving module and a second scan driving module; the first scanning driving module and the second scanning driving module are respectively arranged at two sides of a display area of the display panel; the first scanning driving module comprises a first testing signal end, and the second scanning driving module comprises a second testing signal end; the first test signal end and the second test signal end are both electrically connected with the control module. Fig. 9 is a flowchart illustrating a driving method of a display device according to another embodiment of the present invention. Referring to fig. 9, the driving method of the display device includes the steps of:
s310, detecting a test signal of a first test signal end and a test signal of a second test signal end.
S320, if the test signal of the first test signal end is an abnormal signal or the test signal of the second test signal end is an abnormal signal, in a 2k +1 th frame, controlling the driving mode of the scanning driving module to be forward scanning, and controlling the data driving module to output a forward data signal for displaying an image to the display panel; and in the 2k +2 th frame, controlling the driving mode of the scanning driving module to be reverse scanning, and controlling the data driving module to output an inverted data signal of a display image to the display panel.
On the basis of the foregoing embodiments, optionally, the abnormal signal at least includes: missing pulses, abnormal number of pulses, excessive pulse voltage, insufficient pulse voltage, or malformed pulse shape.
It is to be noted that the foregoing description is only exemplary of the invention and that the principles of the technology may be employed. Those skilled in the art will appreciate that the present invention is not limited to the particular embodiments described herein, and that various obvious changes, rearrangements and substitutions will now be apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in some detail by the above embodiments, the invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the invention, and the scope of the invention is determined by the scope of the appended claims.
Claims (14)
1. A display device, comprising:
a display panel;
the device comprises a scanning driving module, a data driving module and a control module;
the scanning driving module comprises a test signal end, and the test signal end is electrically connected with the control module; the control module is used for controlling the driving mode of the scanning driving module to be forward scanning and controlling the data driving module to output a forward data signal for displaying an image to the display panel in a 2k +1 th frame after detecting the abnormal signal of the test signal end; in a 2k +2 th frame, controlling the driving mode of the scanning driving module to be reverse scanning, and controlling the data driving module to output an inverted data signal of the display image to the display panel; wherein k is a non-negative integer;
the test signal end is used for outputting a test signal of the scanning driving module;
the test signal is used for testing whether the output of one output end of the scanning driving circuit is abnormal or not.
2. The display device according to claim 1, wherein the scan driving module comprises a plurality of cascaded shift register units, and the test signal terminal is electrically connected to the shift register unit of the last stage.
3. The display device according to claim 1, wherein the scan driving module comprises a plurality of cascaded shift register units, and the number of the test signal terminals is plural;
the plurality of test signal ends are respectively electrically connected with the plurality of shift register units.
4. The display device according to claim 1, wherein the scan driving module comprises a plurality of cascaded shift register cells, the shift register cells comprising a plurality of control nodes;
the test signal terminal is electrically connected with at least one control node.
5. The display device according to claim 1, wherein the scan driving module comprises a first scan driving module and a second scan driving module; the first scanning driving module and the second scanning driving module are respectively arranged at two sides of a display area of the display panel;
the first scanning driving module comprises a first test signal end, and the second scanning driving module comprises a second test signal end; the first test signal end and the second test signal end are both electrically connected with the control module.
6. The display device according to claim 1, wherein the display panel includes a non-display region;
the data driving module and the control module are integrated in a driving chip; the driving chip is arranged in the non-display area, and the test signal end is electrically connected with the driving chip.
7. The display device according to claim 1, further comprising a flexible circuit board and a main board;
one end of the flexible circuit board is bound on the display panel, and the other end of the flexible circuit board is connected with the mainboard;
the control module is arranged on the mainboard.
8. The display device according to claim 1, wherein the display panel is at least one of a liquid crystal display panel, an organic light emitting diode display panel, a micro light emitting diode display panel, or an electrophoretic display panel.
9. The driving method of the display device is characterized in that the display device comprises a display panel, a scanning driving module, a data driving module and a control module; the scanning driving module comprises a test signal end which is electrically connected with the control module;
the driving method of the display device includes:
detecting a test signal of the test signal terminal;
if the test signal is an abnormal signal, controlling the driving mode of the scanning driving module to be forward scanning and controlling the data driving module to output a forward data signal for displaying an image to the display panel in a 2k +1 th frame; in the 2k +2 th frame, controlling the driving mode of the scanning driving module to be reverse scanning, and controlling the data driving module to output an inverted data signal of the display image to the display panel; wherein k is a non-negative integer;
the test signal is used for testing whether the output of one output end of the scanning driving circuit is abnormal or not.
10. The driving method of a display device according to claim 9, wherein the scan driving module comprises a plurality of cascaded shift register cells; the number of the test signal ends is multiple, and the multiple test signal ends are respectively and electrically connected with the multiple shift register units;
the detecting the test signal of the test signal terminal further includes:
detecting test signals of a plurality of test signal terminals;
and if the test signal of one test signal end is an abnormal signal, the shift register unit electrically connected with the test signal end or the preceding shift register unit thereof works abnormally.
11. The driving method of a display device according to claim 9, wherein the scan driving module comprises a plurality of cascaded shift register cells; the shift register unit comprises a plurality of control nodes, and the test signal end is electrically connected with at least one control node;
the detecting the test signal of the test signal terminal further includes:
detecting a test signal of at least one of the test signal terminals;
and if the test signal of one test signal end is an abnormal signal, the control node electrically connected with the test signal end or the preceding stage control node thereof works abnormally.
12. The method for driving a display device according to claim 9, further comprising, after the detecting a test signal at the test signal terminal:
if the test signal is a normal signal, controlling the driving mode of the scanning driving module to be forward scanning and controlling the data driving module to output a forward data signal for displaying an image to the display panel in each frame; or, according to the normal signal, in each frame, controlling the driving mode of the scanning driving module to be reverse scanning, and controlling the data driving module to output an inverted data signal of a display image to the display panel.
13. The method for driving a display device according to claim 9, wherein the scan driving module includes a first scan driving module and a second scan driving module; the first scanning driving module and the second scanning driving module are respectively arranged at two sides of a display area of the display panel;
the first scanning driving module comprises a first testing signal end, and the second scanning driving module comprises a second testing signal end; the first test signal end and the second test signal end are both electrically connected with the control module;
the detecting the test signal of the test signal terminal further includes:
detecting a test signal of the first test signal terminal and a test signal of the second test signal terminal;
the test signal is an abnormal signal, and comprises:
the test signal of the first test signal end is an abnormal signal, or the test signal of the second test signal end is an abnormal signal.
14. The method for driving a display device according to any one of claims 9 to 13, wherein the abnormality signal includes at least: pulse missing, abnormal number of pulses, excessive pulse voltage, too small pulse voltage, or malformed pulse shape.
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| US11244646B1 (en) | 2020-09-16 | 2022-02-08 | Himax Technologies Limited | Display device and display control method |
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