Patent Grant
11322063
The present application claims priority to Chinese patent application No. 201710585221.3, filed on Jul. 18, 2017, the entire disclosure of which is incorporated herein by reference as part of the present application.
Embodiments of the present disclosure relate to a scan driving circuit and a driving method thereof, and a display device.
Driving modes for a display panel mainly include an active matrix driving mode and a passive matrix driving mode. A main feature of the active matrix driving mode is to configure one active component for each pixel unit, to separately control each pixel unit. The active matrix driving mode has advantages such as low driving voltage, low power consumption, short response time, applicability to high-definition and large-sized display, and the like.
With development of a display technology, a display using an active matrix driving technology is getting matured day by day. Scanning modes of a gate active drive scanning circuit of the display are all co-directional sequential scanning, for example, progressive scanning or interlaced scanning, so that display frequencies of all display regions on the display panel of the display are fixed.
At least an embodiment of the present disclosure provides a scan driving circuit, which comprises: a control circuit, a scanning circuit group and a first processing circuit group. The control circuit is configured to generate and output a keyword signal to the first processing circuit group, to control a scan order of respective scanning circuits in the scanning circuit group; and the first processing circuit group is configured to generate a scan enable signal according to the keyword signal, and output the scan enable signal to a scanning circuit corresponding to the keyword signal in the scanning circuit group.
At least an embodiment of the present disclosure further provides a display device, which comprises a display panel and the scan driving circuit according to any one of the embodiments of the present disclosure.
At least an embodiment of the present disclosure further provides a driving method for the scan driving circuit according to any one of the embodiments of the present disclosure, comprising: generating and outputting a keyword signal; and generating a scan enable signal according to the keyword signal, the scan enable signal being used for selecting a scanning circuit corresponding to the keyword signal to perform a scan operation.
In order to clearly illustrate the technical solutions of the embodiments of the disclosure, the drawings of the embodiments will be briefly described in the following; it is obvious that the described drawings are only related to some embodiments of the disclosure and thus are not limitative to the disclosure.
In order to make objects, technical details and advantages of the embodiments of the disclosure apparent, the technical solutions of the embodiments will be described in a clearly and fully understandable way in connection with the drawings related to the embodiments of the disclosure. Apparently, the described embodiments are just a part but not all of the embodiments of the disclosure. Based on the described embodiments herein, those skilled in the art can obtain other embodiment(s), without any inventive work, which should be within the scope of the disclosure.
Unless otherwise defined, all the technical and scientific terms used herein have the same meanings as commonly understood by one of ordinary skill in the art to which the present disclosure belongs. The terms “first,” “second,” etc., which are used in the present disclosure, are not intended to indicate any sequence, amount or importance, but distinguish various components. The terms “comprise,” “comprising,” “include,” “including,” etc., are intended to specify that the elements or the objects stated before these terms encompass the elements or the objects and equivalents thereof listed after these terms, but do not preclude the other elements or objects. The phrases “connect”, “connected”, etc., are not intended to define a physical connection or mechanical connection, but may include an electrical connection, directly or indirectly. “On,” “under,” “right,” “left” and the like are only used to indicate relative position relationship, and when the position of the object which is described is changed, the relative position relationship may be changed accordingly. In order to make the following description of the embodiments of the present disclosure clear and concise, the present disclosure omits detailed description of known functions and known components.
A driving circuit of a display panel mainly includes a scan driving circuit (i.e., a gate driving circuit) that drives row lines and a data driving circuit (i.e., a source driving circuit) that drives column lines. The scan driving circuit determines whether thin film transistors (TFTs) in respective pixel units of each row are turned on or off, by controlling scanning voltages of gate terminals of TFTs of each row; and the data driving circuit controls a driving voltage of a source terminal of each TFT through a Digital to Analog Converter (DAC) and the like, so as to control a data signal written into each pixel unit.
For example, the scan driving circuit of the display panel may include a plurality of gate drivers, and each gate driver performs scan operations on different scanning regions, respectively. For example, as shown in
For example, as shown in
Thus, it can be known that, within the scanning time of one frame, the scan driving circuit sequentially performs scan operations from the first scanning region 01 to the fourth scanning region 04. That is, the scanning mode of the scan driving circuit is co-directional sequential scanning, which may be, for example, progressive scanning or interlaced scanning, and the like.
For example, as shown in
For example, it is assumed that, with respect to the first scanning region 01, the second scanning region 02 and the fourth scanning region 04, in the third scanning region 03, a variation difference between display pictures of a first frame and a second frame is relatively large. Because a refresh frequency of the third scanning region 03 remains unchanged, a picture refresh speed of the third scanning region 03 may not keep up with a real-time picture change speed. Thus, phenomena such as picture jam or smear are apt to occur at the third scanning region 03, which reduces a display quality.
At least one embodiment of the present disclosure provides a scan driving circuit and a driving method thereof, and a display device, which may adjust a scan order and/or a scanning direction of respective scanning circuits in real time, dynamically increase a refresh frequency of a display image of a corresponding display region without changing an overall scanning frequency of a display panel, increase a response speed of the display image, and improve a display quality of the display image.
Several embodiments of the present disclosure are described in details below, but the present disclosure is not limited to these specific embodiments.
An embodiment of the present disclosure provides a scan driving circuit. FIG. 2 is a schematic block diagram of a scan driving circuit provided by an embodiment of the present disclosure;
For example, as shown in
For example, as shown in
For example, the keyword signal may be used for identifying a selected scanning circuit 120, that is to say, the selected scanning circuit 120 is a scanning circuit 120 in the scanning circuit group 12 that corresponds to the keyword signal. The control circuit 10 may generate and output a plurality of keyword signals, the number of the plurality of keyword signals may be the same as the number of the plurality of scanning circuits 120, and the plurality of keyword signals may be in one-to-one correspondence with the plurality of scanning circuits 120. An output order of the plurality of keyword signals may determine a scan order of the plurality of scanning circuits 120. For example, a first processing circuit 110 electrically connected with the selected scanning circuit 120 may be referred to as a selected first processing circuit 110. When the keyword signal is input to the selected first processing circuit 110, the selected first processing circuit 110 generates a scan enable signal, and outputs the scan enable signal to the selected scanning circuit 120, so as to drive the selected scanning circuit 120 to start a scan operation. When the keyword signal is input to an unselected first processing circuit 110, the unselected first processing circuit 110 does not generate a scan enable signal, and thus, a scanning circuit 120 electrically connected with the unselected first processing circuit 110 does not perform a scan operation. Therefore, the control circuit 10 may determine the scan order of respective scanning circuits 120 in the scanning circuit group 12, by controlling the output order of the keyword signals corresponding to the respective scanning circuits 120.
For example, as shown in
It should be noted that, in order to clearly show connection relationship of respective portions of the scan driving circuit,
For example, the control circuit 10 may be implemented by adopting a hardware circuit; for example, the control circuit 10 may be composed by transistors, encoders, decoders, amplifiers, and other elements. For another example, the control circuit 10 may also be implemented by a signal processor such as an FPGA, a DSP and a CMU. The control circuit 10 may include, for example, a processor and a memory, and the processor executes a software program stored in the memory to implement functions such as generating and outputting different keyword signals based on a scan order.
For example, the first processing circuit 110, the first feedback circuit 130 and the scanning circuit 120 may also be implemented by adopting the hardware circuit. Specific circuit structures of the first processing circuit 11, the first feedback circuit 130 and the scanning circuit 120 may be designed according to actual application needs, which will not be specifically limited in the embodiment of the present disclosure.
For example, as shown in
For example, the conversion sub-circuit 111 is configured to receive the keyword signal, and convert series information in the keyword signal into parallel information. The parallel information may be a multi-bit binary number, and includes keyword information and scan operation information. The keyword information is configured to identify the selected scanning circuit 120, and the scan operation information is configured to determine whether or not the selected scanning circuit 120 completes the scan operation. For example, as shown in
For example, the amount of bits of the binary number in the keyword information is equal to the amount of scanning circuits 120.
For example, when the scan operation information indicates that the scan operation is started, the switch sub-circuit 112 is turned on and outputs the keyword information to the judgment sub-circuit 113, and the judgment sub-circuit 113 generates a judgment result according to the keyword information and outputs the judgment result to the output sub-circuit 114. When the corresponding scanning circuit 120 is selected to perform the scan operation, the judgment result is a turn-on signal; and when the corresponding scanning circuit 120 is not selected, the judgment result is a turn-off signal. When the judgment result is the turn-on signal, the output sub-circuit 114 may output the scan enable signal STV to the selected scanning circuit 120.
For example, when the judgment result is the turn-on signal, a logical value of the judgment result may be 1; and when the judgment result is the turn-off signal, the logical value of the judgment result may be 0. A specific numerical value of the judgment result will not be limited in the present disclosure here.
For example, the conversion sub-circuit 111 may include a plurality of keyword output terminals 1110 and a scan operation output terminal 1111, and the amount of the plurality of keyword output terminals 1110 may be equal to the amount of bits of the keyword information, so that the plurality of keyword output terminals 1110 may respectively output different bits of the keyword information. As shown in
For example, the judgment sub-circuit 113 may include an AND gate. As shown in
It should be noted that, in
For example, as shown in
It is to be noted that, transistors used in the embodiments of the present disclosure may be thin film transistors, field effect transistors or other switch devices with the like characteristics. A source electrode and a drain electrode of the transistor used herein may be symmetrical in structure, so the source electrode and the drain electrode of the transistor may have no difference in structure. In the embodiments of the present disclosure, in order to distinguish two electrodes of the transistor apart from a gate electrode, one of the two electrodes is directly referred to as a first electrode, and the other of the two electrodes is referred to as a second electrode, and therefore the first electrode and the second electrode of all or part of the transistors in the embodiments of the present disclosure are interchangeable as required. For example, the first electrode of the transistor described in the embodiment of the present disclosure may be the source electrode, and the second electrode of the transistor may be the drain electrode; alternatively, the first electrode of the transistor may be the drain electrode, and the second electrode of the transistor may be the source electrode. In addition, the transistors may be classified into N-type transistors and P-type transistors according to the characteristics of the transistors, and the embodiments of the present disclosure are described in detail by taking the switch transistors as the N-type transistors as an example. Based on the description and teachings of the implementations of the N-type transistors in the present disclosure, a person having ordinary skill in the art can implement the embodiments of the present disclosure by using P-type transistors, without any inventive work, which should be within the scope of the disclosure.
For example, the output sub-circuit 114 includes a pulse generator, for example, the pulse generator may convert a narrow pulse signal into a broad pulse signal. An output terminal of the judgment sub-circuit 113 is electrically connected with the output sub-circuit 114. When the judgment result of the judgment sub-circuit 113 is the turn-on signal, the turn-on signal is the narrow pulse signal, which cannot be used for driving the scanning circuit 120 to perform a scan operation, and the turn-on signal with the narrow pulse needs to be converted by the pulse generator into a scan enable signal STV with the broad pulse which may drive the scanning circuit 120 to perform the scan operation, and then the scan enable signal STV is output to the selected scanning circuit 120, to drive the selected scanning circuit 120 to start the scan operation.
For example, each of the first processing circuits 110 further includes a first amplifier 115a and a second amplifier 115b. An input terminal of the first amplifier 115a is electrically connected with the scan operation output terminal 1111, and an output terminal of the first amplifier 115a is electrically connected with a gate electrode of each switch transistor. An input terminal of the second amplifier 115b is electrically connected with the output terminal of the judgment sub-circuit 113, and an output terminal of the second amplifier 115b is electrically connected with the input terminal of the output sub-circuit 114. The first amplifier 115a is used for amplifying the scan operation information, so that a voltage of the scan operation information satisfies a turn-on voltage of the switch transistor. The second amplifier 115b is used for amplifying the turn-on signal output by the judgment sub-circuit 113.
It should be noted that, in this embodiment, the logical value “0” may represent a low level, and the logical value “1” may represent a high level. The input terminal of the AND gate is set to “negative”, which indicates that: when the logical value of input information is 1, the logical value of the judgment result is 0; and when the logical value of the input information is 0, the logical value of the judgment result is 1. The input terminal of the AND gate is set to “positive”, which indicates that: when the logical value of the input information is 1, the logical value of the judgment result is 1; and when the logical value of the input information is 0, the logical value of the judgment result is 0. The present disclosure may further include other setting modes, and the present disclosure is not limited thereto.
For example, the scanning circuit 120 is configured to generate scanning signals, to sequentially turn on thin film transistors in respective rows. As shown in
For example, the shift register 121 and the scan outputting sub-circuit 122, under control of the scan enable signal STV, scan output control information OE1 and scan shift signal CPV, apply a high voltage Von and a low voltage Vgl to the gate line 123 in a time sharing manner, so as to control corresponding thin film transistors in the display panel to be turned on or turned off.
For example, when the scan enable signal STV is effective (for example, when the scan enable signal STV is at a high level), at a rising edge of the scan shift signal CPV, the shift register 121 may generate and output a low voltage logical value, and the low voltage logical value is, for example, 5V/0V. When the scan output control information OE1 is effective (for example, when the scan output control information OE1 is at a low level), the AND gate may transmit the low voltage logical value output by the shift register 121 to the level shifter. The level shifter uses the low voltage logical value to implement outputting a high voltage logical value, the high voltage logical value may be an operating voltage value required to drive the pixel unit to operate, and the high voltage logical value include the high voltage Von (e.g., 40V) and the low voltage Vgl (e.g., 0V). Because a load capacitance formed by the thin film transistor, a data line, the pixel unit, and the like is relatively large, if the high voltage logical value output by the level shifter directly drives the pixel unit through the gate line 123, a drive capability of the high voltage logical value may be insufficient, and thus, the amplified output buffer needs to be disposed between the gate line 123 and the level shifter, so as to increase an output drive capability of the scan outputting sub-circuit 122.
For example, after the selected scanning circuit 120 completes the scan operation, the selected scanning circuit 120 may output a scan completion signal CS to a corresponding first feedback circuit 130. The corresponding first feedback circuit 130 generates a keyword feedback signal in response to the scan completion signal CS and the keyword signal, and then outputs the keyword feedback signal to the control circuit 10. For example, the corresponding first feedback circuit 130 may perform an operation of subtracting one on the scan operation information in the keyword signal in response to the scan completion signal CS, to obtain the keyword feedback signal. For example, the keyword feedback signal indicates that the selected scanning circuit 120 completes the scan operation.
For example, the first feedback circuit 130 may be implemented by adopting transistors, AND gates, JK triggers, T triggers, amplifiers and/or other suitable hardware, and the present disclosure is not limited thereto.
For example, according to the amount of the scanning circuits 120 and/or the amount of the first processing circuits 110, the display panel may be divided into a plurality of different display regions, and the plurality of scanning circuits 120 and/or the plurality of first processing circuits 110 may be in one-to-one correspondence with the plurality of display regions respectively. As shown in
For example, in the example shown in
It should be noted that, in
For example, in conjunction with
For example, the judgment sub-circuits 113 of the first processing circuits 110 corresponding to the plurality of display regions are all AND gates, each of which has four input terminals; however, settings of the input terminals of the AND gates corresponding to different display regions are different from one another. For example, in correspondence between the keyword information and the display region as described above, for the judgment sub-circuit 113 corresponding to the first display region 31 (the selected keyword information is 1000), settings of four input terminals corresponding to the keyword information X1, X2, X3 and X4 are respectively positive, negative, negative and negative; for the judgment sub-circuit 113 corresponding to the second display region 32 (the selected keyword information is 0100), settings of four input terminals corresponding to the keyword information X1, X2, X3 and X4 are respectively negative, positive, negative and negative; for the judgment sub-circuit 113 corresponding to the third display region 33 (the selected keyword information is 0010), settings of four input terminals corresponding to the keyword information X1, X2, X3 and X4 are respectively negative, negative, positive and negative; and for the judgment sub-circuit 113 corresponding to the fourth display region 34 (the selected keyword information is 0001), settings of four input terminals corresponding to the keyword information X1, X2, X3 and X4 are respectively negative, negative, negative and positive.
For example, the keyword signal may be simultaneously output to all of the first processing circuits 110; however, because settings of input terminals of the judgment sub-circuits 113 of respective first processing circuits 110 are different from one another, only the first processing circuit 110 corresponding to the keyword signal may be selected and output the scan enable signal.
It should be noted that, correspondence between the keyword information and the display region is not limited to the above description; according to actual application requirements and circuit design, other correspondences may also be adopted, and only the setting of the input terminals of the judgment sub-circuit 113 may be changed accordingly. For example, when the keyword information is 0111, that is, X1=0, X2=1, X3=1, and X4=1, it indicates that the scanning circuit 120 corresponding to the first display region 31 is selected to perform a scan operation, and settings of four input terminals corresponding to the keyword information X1, X2, X3 and X4 in a corresponding AND gate 113 are respectively negative, positive, positive and positive; when the keyword information is 1011, that is, X1=1, X2=0, X3=1, and X4=1, it indicates that the scanning circuit 120 corresponding to the second display region 32 is selected to perform a scan operation, and settings of four input terminals corresponding to the keyword information X1, X2, X3 and X4 in a corresponding AND gate 113 are respectively positive, negative, positive and positive; when the keyword information is 1101, that is, X1=1, X2=1, X3=0 and X4=1, it indicates that the scanning circuit 120 corresponding to the third display region 33 is selected to perform a scan operation, and settings of four input terminals corresponding to the keyword information X1, X2, X3 and X4 in a corresponding AND gate 113 are respectively positive, positive, negative and positive; when the keyword information is 1110, that is, X1=1, X2=1, X3=1 and X4=0, it indicates that the scanning circuit 120 corresponding to the fourth display region 34 is selected to perform a scan operation, and settings of four input terminals corresponding to the keyword information X1, X2, X3 and X4 in a corresponding AND gate 113 are respectively positive, positive, positive and negative. For example, a keyword information bit with a logical value of “1” corresponds to a “positive” input terminal, and a keyword information bit with a logical value of “0” corresponds to a “negative” input terminal. In this case, the setting of the input terminals of the judgment sub-circuit 113 is opposite to the setting in the above description. Correspondence between the keyword information and the display region will not be specifically limited in this embodiment.
For example, the amount of bits of the keyword information is not limited to the above description, and the keyword information may also comprise two binary numbers X1 and X2 arranged sequentially, provided that a circuit structure of the judgment sub-circuit 113 is changed accordingly. In this case, for example, when the keyword information is 00, that is, X1=0, X2=0, it indicates that the scanning circuit 120 corresponding to the first display region 31 is selected to perform a scan operation; when the keyword information is 01, that is, X1=0, X2=1, it indicates that the scanning circuit 120 corresponding to the second display region 32 is selected to perform a scan operation; when the keyword information is 10, that is, X1=1, X2=0, it indicates that the scanning circuit 120 corresponding to the third display region 33 is selected to perform a scan operation; and when the keyword information is 11, that is, X1=1, X2=1, it indicates that the scanning circuit 120 corresponding to the fourth display region 33 is selected to perform a scan operation.
For example, when the keyword information comprises two binary numbers X1 and X2, as shown in
For example, the control circuit 10 is further configured to determine a scan order of the plurality of scanning circuits 120, according to a variation difference of adjacent frames in the plurality of display regions. The control circuit 10 is further configured to receive the keyword feedback signal from the first feedback circuit 130, and generate a next keyword signal according to the scan order of the plurality of scanning circuits 120 and the keyword feedback signal. For example, display pictures of adjacent frames of respective display regions may be separately perform differentiated comparison, and the respective display regions are sorted according to differentiation of the display pictures; the higher the differentiation, the higher the priority of the scan order of the corresponding display region within scanning time of one frame. The control circuit 10 may, with reference to differentiation of the display pictures and according to a designed output principle, generate and output the scan order of the plurality of scanning circuits 120, so that the scan driving circuit may dynamically adjust the scan order of the plurality of scanning circuits 120 in real time, according to a variation difference of adjacent frames, increase the refresh frequency of the display region where the variation difference of adjacent frames is relatively large, enhance a response speed of the picture, and improve a display quality of the picture.
For example, as shown in
S1: the control circuit 10 generates and outputs a keyword signal 10001, so that a first processing circuit 110, a scanning circuit 120 and a first feedback circuit 130 corresponding to the first display region 31 are selected to perform the scan operation, and when scanning is completed, the first feedback circuit 130 corresponding to the first display region 31 generates and outputs a keyword feedback signal 10000 (10001−1=10000) to the control circuit 10;
S2: after receiving the keyword feedback signal 10000, the control circuit 10 generates and outputs a next keyword signal 00101 according to the scan order, so that a first processing circuit 110, a scanning circuit 120 and a first feedback circuit 130 corresponding to the third display region 33 are selected to perform the scan operation, and when scanning is completed, the first feedback circuit 130 corresponding to the third display region 33 generates and outputs a keyword feedback signal 00100 (00101−1=00100) to the control circuit 10;
S3: after receiving the keyword feedback signal 00100, the control circuit 10 generates and outputs a next keyword signal 01001 according to the scan order, so that a first processing circuit 110, a scanning circuit 120 and a first feedback circuit 130 corresponding to the second display region 32 are selected to perform the scan operation, and when scanning is completed, the first feedback circuit 130 corresponding to the second display region 32 generates and outputs a keyword feedback signal 01000 (01001−1=01000) to the control circuit 10;
S4: after receiving the keyword feedback signal 01000, the control circuit 10 generates and outputs a next keyword signal 00011 according to the scan order, so that a first processing circuit 110, a scanning circuit 120 and a first feedback circuit 130 corresponding to the fourth display region 34 are selected to perform the scan operation, and when scanning is completed, the first feedback circuit 130 corresponding to the fourth display region 34 generates and outputs a keyword feedback signal 00010 (00011−1=00010) to the control circuit 10.
Thus, the scan driving circuit completes scanning of a second frame. As shown in
For example, within scanning time of one frame, each of the display regions includes a pixel charging process and a pixel voltage maintaining process. As shown in
For example, relative to the scanning time of the second frame, if within the scanning time of a third frame, a variation difference of the display picture of the third display region 33 is still larger than that of other display regions, then the scanning position of the third display region 33 may still be shifted forward by one position, so that during the scanning time of the third frame, the scan order of the display panel becomes an order of the third display region 33, the first display region 31, the second display region 32 and the fourth display region 34, and the pixel refresh frequency of the third display region 33 may still be f2.
It should be noted that, the scan order is adjusted with reference to the scan order of respective display regions in the scanning time of an adjacent previous frame. As shown in
For example, as shown in
For example, as shown in
For example, as shown in
For example, as shown in
For example, circuit structures of the second feedback circuit 230 and the first feedback circuit 130 may be the same. The second feedback circuit 230 may also, for example, perform an operation of subtracting one on the scan operation information in the keyword signal, in response to the scan completion signal CS_D, so as to obtain the keyword feedback signal. The circuit structures of the second feedback circuit 230 and the first feedback circuit 130 may also be different, provided that a function of performing the operation of subtracting one on the scan operation information in the keyword signal may be implemented.
For example, as shown in
For example, the respective first processing circuits 110 cause the scanning direction of the corresponding scanning circuits 120 to be forward scanning, and the respective second processing circuits 210 cause the scanning direction of the corresponding scanning circuits 120 to be backward scanning. As shown in
For example, as shown in
When the scan operation information indicates that the scan operation is started and the direction selection information indicates that backward scanning is performed, the switch sub-circuit 111 of the corresponding second processing circuit 210 is turned on and outputs the keyword information to the judgment sub-circuit 113 of the corresponding second processing circuit 210, the judgment sub-circuit 113 of the corresponding second processing circuit 210 generates a judgment result according to the keyword information and outputs the judgment result to the output sub-circuit 114 of the corresponding second processing circuit 210, when the scanning circuit 120 electrically connected with the corresponding second processing circuit 210 is selected to perform the backward scan operation, the judgment result is a turn-on signal; when the judgment result is the turn-on signal, the output sub-circuit 114 of the corresponding second processing circuit 210 generates and outputs the scan enable signal STV_D according to the turn-on signal.
For example, compared with the switch sub-circuit 112 shown in
For example, each of the first processing circuits 11 and each of the second processing circuits 210 further include a third amplifier 115c. The third amplifier 115c is used for amplifying the direction selection information, so that a voltage of the direction selection information reaches a turn-on voltage of the control transistor M5/the control transistor M5′.
For example, settings of the scanning circuit 120, the first feedback circuit 130, the conversion sub-circuit 111, the switch sub-circuit 112, the judgment sub-circuit 113, the output sub-circuit 114, and the like, may be referred to related descriptions in the first example (for example, related descriptions of the example shown in
It should be noted that, in the second example and the third example, the scan driving circuit may also comprise only the first feedback circuit 130 or the second feedback circuit 230. Both the scan completion signal CS_U and the scan completion signal CS_D may be input to the first feedback circuit 130 or the second feedback circuit 230, so as to generate and output the keyword feedback signal to the control circuit 10.
For example, as shown in
For example, the forward scan operation indicates that the scanning direction is a second direction shown in
For example, as shown in
For example, as shown in
For example, as shown in
For example, if, relative to the scanning time of the second frame, within the scanning time of a third frame, a variation difference of the display picture of the eighth display region 38 is still larger than that of other display regions, then the scanning position of the eighth display region 38 still needs to be shifted forward; because the seventh display region 37 and the eighth display region 38 correspond to one scanning circuit 120, that is, the seventh display region 37 and the eighth display region 38 need to continuously perform scan operations, so that during the scanning time of the third frame, the scan order of the respective display regions needs to be changed, and the scanning position of the scanning circuit 120 corresponding to the seventh display region 37 and the eighth display region 38 is, for example, shifted forward by one position. During the scanning time of the third frame, the pixel refresh frequency of the eighth display region 38 is further increased, and may be f3, where f3 is greater than f2.
For example, according to an actual situation, the scanning position of the scanning circuit 120 corresponding to the seventh display region 37 and the eighth display region 38 may also be shifted forward by two positions, three positions, etc.
For example, in the example shown in
It should be noted that, in
In summary, in the scan driving circuit provided by the embodiment of the present disclosure, during scanning time of each frame, the scan order and/or the scanning direction of the respective scanning circuits 120 may be rearranged according to a variation difference of the display pictures of adjacent frames, so as to dynamically increase the refresh frequency of a display region where a variation difference of the display pictures is relatively large without changing an overall scanning frequency, improve the response speed of the display picture, and improve the quality of the display picture.
It should be noted that, the scan order and/or the scanning direction of the respective scanning circuits 120 may further be determined by other ways, for example, according to sizes of the respective display regions. The embodiment of the present disclosure is not specifically limited thereto.
An embodiment of the present disclosure further provides a display device.
For example, as shown in
For example, the display panel 2 may be a liquid crystal display panel, an organic light-emitting display panel, and the like.
For example, the display device 1 may comprise any products or components having a display function such as a mobile phone, a tablet, a television, a monitor, a notebook computer, a digital photo frame, a navigator, or the like.
An embodiment of the present disclosure further provides a driving method for the scan driving circuit according to any one of the above embodiments.
For example, as shown in
S11: generating and outputting a keyword signal;
S12: generating a scan enable signal according to the keyword signal, the scan enable signal being used for selecting a scanning circuit corresponding to the keyword signal to perform a scan operation.
For example, the scan driving circuit includes a control circuit and a scanning circuit group, and the scanning circuit group includes a plurality of scanning circuits. The control circuit is used to generate and output the keyword signal, and the keyword signal may be used to identify a selected scanning circuit.
For example, before the operation S11 is performed, the driving method of the scan driving circuit may further comprise a following operation: dividing the display panel into a plurality of display regions, and determining a scan order of the plurality of scanning circuits corresponding to the plurality of display regions, according to a variation difference of adjacent frames in the plurality of display regions.
For example, the scan order of the plurality of scanning circuits may determine an output order of keyword signals, so that the plurality of scanning circuits perform scan operations in order.
For example, in one example, the scan driving circuit includes a first processing circuit group, the first processing circuit group includes a plurality of first processing circuits, and the plurality of first processing circuits are electrically connected with the plurality of scanning circuits in one-to-one correspondence. A first processing circuit electrically connected with the selected scanning circuit is a selected first processing circuit. When the keyword signal is input to the selected first processing circuit, the selected first processing circuit may generate and output a scan enable signal to the selected scanning circuit, to control the selected scanning circuit to perform the scan operation.
For example, the keyword signal may further determine a scanning direction of the selected scanning circuit. According to the keyword signal, the scan enable signal may further control the scanning circuit to perform a forward scan operation or a backward scan operation.
For example, in one example, each of the first processing circuits may include a direction selection sub-circuit. When the keyword signal determines that the scanning circuit performs the forward scan operation, a direction selection sub-circuit of the selected first processing circuit may transmit the scan enable signal to a forward scan input terminal of the selected scanning circuit, to control the selected scanning circuit to perform the forward scan operation; and when the keyword signal determines that the scanning circuit performs the backward scan operation, the direction selection sub-circuit of the selected first processing circuit may transmit the scan enable signal to the backward scan input terminal of the selected scanning circuit, to control the selected scanning circuit to perform the backward scan operation.
For example, in one example, the scan driving circuit further comprises a second processing circuit group, the second processing circuit group includes a plurality of second processing circuits, and the plurality of second processing circuits are also electrically connected with the plurality of scanning circuits in one-to-one correspondence. A second processing circuit electrically connected with the selected scanning circuit is a selected second processing circuit. When the keyword signal determines that the scanning circuit performs the forward scan operation, the selected first processing circuit may generate and output the scan enable signal to the forward scan input terminal of the selected scanning circuit, to control the selected scanning circuit to perform the forward scan operation; and when the keyword signal determines that the scanning circuit performs the backward scan operation, the selected second processing circuit may generate and output the scan enable signal to the backward scan input terminal of the selected scanning circuit, to control the selected scanning circuit to perform the backward scan operation.
For example, after the operation S12 is ended, the driving method of the scan driving circuit may further comprise a following operation: generating a keyword feedback signal upon the scanning circuit completing the scan operation; and generating a next keyword signal, according to the keyword feedback signal and the scan order of the plurality of scanning circuits.
For example, in one example, the scan driving circuit comprises a first feedback circuit group, and the first feedback circuit group includes a plurality of first feedback circuits that are in one-to-one correspondence with the plurality of scanning circuits. The plurality of first feedback circuits are all electrically connected with the control circuit, to receive the keyword signals and transmit the keyword feedback signals. A first feedback circuit electrically connected with the selected scanning circuit is a selected first feedback circuit. For example, when the selected scanning circuit completes the scan operation, the selected scanning circuit may output a scan completion signal to the selected first feedback circuit, and the selected first feedback circuit generates and outputs the keyword feedback signal to the control circuit in response to the keyword signal and the scan completion signal, so that the control circuit may generate a next keyword according to the keyword feedback signal and the scan order of the plurality of scanning circuits.
For example, in one example, the scan driving circuit further comprises a second feedback circuit group, and the second feedback circuit group includes a plurality of second feedback circuits that are in one-to-one correspondence with the plurality of scanning circuits. A second feedback circuit electrically connected with the selected scanning circuit is a selected second feedback circuit. The plurality of second feedback circuits are all electrically connected with the control circuit, to receive the keyword signals and transmit the keyword feedback signals. For example, when the selected scanning circuit completes the forward scan operation, the selected scanning circuit may output the scan completion signal to the selected first feedback circuit, and the selected first feedback circuit generates and outputs the keyword feedback signal to the control circuit in response to the keyword signal and the scan completion signal; or; when the selected scanning circuit completes the backward scan operation, the selected scanning circuit may output the scan completion signal to the selected second feedback circuit, and the selected second feedback circuit generates and outputs the keyword feedback signal to the control circuit in response to the keyword signal and the scan completion signal. The control circuit may generate a next keyword signal, according to the keyword feedback signal and the scan order and the scanning direction of the plurality of scanning circuits.
For example, after the scanning time of one frame is ended, the driving method of the scan driving circuit may comprise a following operation: re-acquiring a comparison result of a variation difference of display pictures of adjacent frames in different display regions; rearranging the scan order and/or the scanning direction of the respective display regions according to the variation difference of the display pictures.
The driving method provided by the embodiment of the present disclosure may adjust the scan order and the scanning mode of the plurality of scanning circuits in real time according to a variation difference of display pictures of adjacent frames, so as to dynamically increase a refresh frequency of the display picture of the corresponding display region without changing an overall scanning frequency of a display panel, increase a response speed of the display picture, and improve a display quality of the display picture.
For the present disclosure, the following statements should be noted:
(1) the accompanying drawings involve only the structure(s) in connection with the embodiment(s) of the present disclosure, and other structure(s) can be referred to in common design(s); and
(2) in case of no conflict, the embodiments of the present disclosure and the features in the embodiment(s) can be combined with each other to obtain new embodiment(s).
What have been described above are only specific implementations of the present disclosure, the protection scope of the present disclosure is not limited thereto. Any modifications or substitutions that easily occur to those skilled in the art within the technical scope of the present disclosure should be within the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.
| Number | Date | Country | Kind |
|---|---|---|---|
| 201710585221.3 | Jul 2017 | CN | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/CN2018/074002 | 1/24/2018 | WO | 00 |
| Publishing Document | Publishing Date | Country | Kind |
|---|---|---|---|
| WO2019/015289 | 1/24/2019 | WO | A |
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| 5850216 | Kwon | Dec 1998 | A |
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| Number | Date | Country |
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| 101866633 | Oct 2010 | CN |
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| The Third Chinese Office Action dated Dec. 30, 2019; Appln. No. 201710585221.3. |
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| Number | Date | Country | |
|---|---|---|---|
| 20210225226 A1 | Jul 2021 | US |
